The device for fastening the cutting insert

 

(57) Abstract:

The device for fastening the cutting insert refers to mining, and specifically to mining tool used in the destruction of rocks. The device comprises a sleeve, made with the possibility of installation in the hole of the holder insert. The sleeve has a through hole in which is rotatably mounted cutting clove, and a housing with a flange which serves to prevent axial movement of the sleeve relative to the holder cloves. In the housing and/or the collar is made of the area of the undercut to reduce maximum loads between the housing and the collar. Holder insert and sleeve are designed to be used to fix the position of the sleeve in the axial direction relative to the hull of the holder cloves fixed by planting so that the sleeve can be easily removed from this hull. The invention improves the life of the mining tool. 1 C. and 6 C.p. f-crystals, 14 ill.

The present invention relates to holders and cutting inserts used for blasting of fossil materials, such as coal and similar materials from subterranean formations, and in somosa sarubobo the drum and containing pressed removable sleeve, in which is rotatably mounted cutting clove.

In the mining industry widely used mountain mechanisms containing rotating zarubei drum with attached cutting teeth made with the possibility of vertical travel. Due to the rotation Zarubova drum and the moving mountain combine inside the excavated material the latter is extracted for further processing.

It is well known that in the process of extraction of minerals such cutting teeth and their holders are exposed to significant loads acting in the axial, vertical and transverse directions relative to the cutting insert. This leads to the fact that during normal operations the mining takes place wear or breakage of the cutting inserts, which necessitates their frequent replacement. Actually replacing cutting inserts should be made daily. In this regard, much effort was focused on creating a quick-detachable cutting inserts, which could with minimal effort to extract from their holders.

As devices for securing the cutting insert are not the principal means by which fossil Mat the way, created devices for securing the cutting insert, comprising a holder, a cutting insert, which holds the heart and which can be installed in Zarubino drum mountain harvester. Such holders, as a rule, provide the possibility of rotation of the cutting insert that allows you to prevent uneven wear, but, on the other hand, these holders cutting clove can be fixed in one position. However, the actual holders from the surface of the face, are subjected to considerable wear, and their failure can lead to the need for replacement at intervals of from two to six months. In addition, if the construction of the holders provides the possibility of rotation of the cutting insert, the result of such relative movement is the rapid wear of the retaining surfaces of the holders, which become unusable. It is well known that the replacement of the holders of the cutting insert leads to significant financial costs and downtime of the main mining equipment, working in intensive mode.

To solve these problems have been developed devices for securing the cutting insert, comprising a removable sleeve button m is her cutting insert due to the limitation of internal wear, which is subjected to the holder. Previously used bushings that are either freely rotate within the holder cloves, or were fixed in one position relative to the holder. Thanks to the uniform wear of the surfaces of the sleeve in contact with the surface of the face, the sleeve of the rotary type has a longer lifetime compared to non-hub. However, the rotary sleeve cause wear on the inner surfaces of the holders Zubkov and ultimately destroy the holders in which they revolve.

Previously, some of the non-sleeve held in place by a fixed landing along their entire length. When you fixed landing difficult or even impossible to remove the bushings on the mine site. So, for example, to remove some of the bushings efforts are needed in excess of 32659 kg (72000 pounds). The effort of this magnitude can hardly be created in the extreme environment that uses such cutting teeth. The inventor believes that it is irrational to perform an interference fit along the entire length of the sleeve so as to provide suitable conditions for its removal, because neobhodimym some applications of the invention, the authors tried to apply an interference fit directly between the holder insert and the cutting insert. Such constructions are described in U.S. patent N 2800302, issued in the name McLennan, and N 3143177, issued in the name Galorneau and others, although the author of the present invention considers these solutions are unsatisfactory because they do not describe the bushing, preventing excessive wear of the holder insert. The author also believes that in these constructions there is another significant disadvantage of not allowing you to use them for cutting inserts used in the mining industry and are exposed to heavy axial loads. In these structures the fixed landing consists of two (2) tapered surfaces on the cutting insert, interacting with the hole in the holder cloves. But because of this design there is no belt receiving axial forces that occur during the execution of the notches, it can be assumed that the axial forces which occur during the mining act on these conical surface, causing a split holder.

The above problems are solved by the holder cloves, described in U.S. patents NN 5088797 and 5302005 that are issued to the author of the present invention and which are introduced into this description by reference. In these patents the proposed rule relative to the hull of the holder by a fixed landing whereby the sleeve may be manually removed from the holder. Such "pressed" bushings have an outer flange facing forward and positioned near the cylindrical body. At the junction of the flange to the body, usually formed by the radius of the transition curve. Cylindrical body is pressed into the hole in the holder and held therein formed between the fixed landing. Since the cylindrical body is pressed into the hole in the bracket, hard shoulder prevents shifting of the sleeve inward, which leads to large shear loads at the base of the specified radius of the transition curve between the cylindrical body and the flange. Such occurrence of the load at the base of the radius of the transition curve can lead to premature failure of the bushing.

Thus, there is a need to create a design with pressed sleeve having a longer lifetime in comparison with the known similar bushings for mounting the cutting insert.

The present invention relates to a device for fastening the cutting insert used in the mining industry in the holder cloves attached to the rotary Baranay parts are made hole, designed for installation sleeve having one-piece construction and includes a housing and preferably the flange, forming at one end of the sleeve band to transmit axial forces to the housing while ensuring its protection. Housing near the flange preferably has a first tapered section and the flange near the body is the second tapered section adjacent to the first conical segment with the creation of the area of the undercut intended to reduce the maximum load that occurs at the junction of the flange with the body. The sleeve has a through hole, in which is rotatably inserted cutting teeth having a protruding shank.

The design of the sleeve and holder of cloves helps prevent rotation of the sleeve relative to the hull of the holder by formed between the fixed landing. However, if necessary, replace the design of the sleeve and holder allows you to remove the sleeve from the hull of the holder directly in the mine with minimum effort.

Thus, the present invention provides a solution to the above problems inherent in the devices for fastening the cutting insert of mining combine. From the to the holder by a fixed landing provide the ability to remove the sleeve from the holder by hand. In addition, due to the implementation area of the undercut in the flange and/or the outer casing of the various preferred embodiments of the present invention also have a longer life compared with sleeves known designs.

These and other features, objectives and advantages of the invention will be clear from the following description of the preferred variants of its implementation.

Preferred embodiments of the invention are presented in the attached drawings, in which:

Fig. 1 depicts a side view of the device for fastening the cutting insert,

Fig. 2 depicts a side view of another variant of the proposed device for fastening the cutting insert,

Fig. 3 depicts a perspective view of disassembled embodiment of the proposed device for fastening the cutting insert,

Fig. 4 depicts a perspective view of the assembled device for fastening the cutting insert shown in Fig. 3,

Fig. 5 depicts in sectional view in a disassembled view of the device for fastening the cutting insert shown in Fig. 3, for clarity, the heart is not depicted in the context of the. 3, for clarity, the heart is not depicted in the cut

Fig. 7 depicts a side view of the preferred construction of the sleeve shown in Fig. 5 and 6

Fig. 8 depicts a section of the sleeve shown in Fig. 7,

Fig. 9 depicts a side view of another offer preferred bushing design,

Fig. 10 depicts a section of the sleeve shown in Fig. 9,

Fig. 11 depicts a side view of another offer preferred bushing design,

Fig. 12 depicts a section of the sleeve shown in Fig. 11,

Fig. 13 depicts a side view of another offer preferred design of the sleeve, and

Fig. 14 depicts a section of the sleeve shown in Fig. 13.

A detailed description of the preferred embodiment of the invention

In the drawings, serving only to illustrate the preferred embodiment of the invention, and not limiting these options, shown zarubei drum 10th mountain harvester on which the cutting teeth 12 is fixed by a holder 18 cloves.

In particular, in Fig. 1 shows a drum 10 mounted on a mountain harvester for rotation in the direction of the arrow 16. As is well known from the technical field, the drum 10 installation the ain can move forward, that in Fig. 1 corresponds to the direction from left to right. It is also known that the drum 10 includes a generally installed on it cutting teeth 12. However, in this description are considered a single clove 12 and the design of the single holder 18.

In General, the holder 18 can be attached to the drum 10, either directly or through intermediate means. For example, the holder can be welded to the drum 10 or secured to it by means of a clamping device or can be attached to the mounting block fastened to the drum. The following describes the holder 18, which is inserted and held by a sleeve 50 which in turn is inserted rotatably heart 12.

Clove 12 may be of known construction and includes a Central cylindrical shank 24 and a wider conical nose 26 attached to the shank so that between them formed area 28 of the belt. On one end of the insert 12 having a Central axis 29, has a hard cutting tip 30, the material and construction is known in this technical field. At the other end of the insert 12 is made groove 32 and the terminal belt 34 so that the inside of the groove 32 can be inserted into the retaining ring (not shown), the gain, is depicted in Fig. 3, 4, 5 and 6, the holder 18 has a housing portion 38 and a base 40, which is attached to the drum 10 directly or through intermediate means in the form of a mounting block (not shown). Part 38, made in one piece with the base 40 has a hole 42 into which is inserted coaxially of the sleeve 50. The hole 42 restricts the inner surface 42A, comprising two sections of different diameters, namely a first section 43 and the second section 45 of somewhat smaller diameter. The difference of the diameters can be, for example, about 0,794 mm (one thirty-second of an inch) in diameter, section 43, is equal to 47,624 mm (one and seven-eighths inch). Part 38 has two ends: the rear end 39, is facing in the opposite direction from the direction of rotation, and the front end 41, facing the direction of rotation. Part 38 has a contact surface 44, shown perpendicular to the longitudinal axis 46 of the hole 42, which coincides with the Central axis 29.

As described above, the bushing is pressed into the holders of the cutting inserts and held in place, fixed landing formed between these parts, prone to premature failure, due to the high loads that occur at the base elevation is NII another connection between the outer casing and the flange shear load is distributed over a larger area, which ultimately leads to a decrease in the maximum shear stresses at the connection.

In Fig. 7 and 8 shows the preferred design of the sleeve, in which the connection between the flange and the housing sleeve is less stringent. As seen in these drawings, the sleeve 50 has an elongated body 52 and the flange 54, which has an inner surface 56 and an outer surface 58. The surface 56 of the flange 54 serves to lock in the contact surface described above, the holder of the cutting insert. The surface 58 of the flange 54 preferably has a tapered section 60 and a flat plot 62. The housing 52 of the sleeve 50 has an outer surface 52a, also having two sections of different diameters, namely a first section 53 and the second section 55.

The first section 53 of the sleeve 50 is sized to provide an interference fit between it and the first section 43 of the holes 42 in the holder of the cutting insert. By analogy with the above, the second section 55 of the sleeve 50 has a smaller diameter, which, for example, on 0,794 mm (one thirty-second of an inch) smaller than the diameter of the first section that allows you to provide an interference fit between the second section 55 of the sleeve 50 and the second section 45 of the openings 42. Lots sootvetstvenno between sections 43 and 53 and respectively 45 and 55, is preferably from 0.05 to 0.127 mm (0.002 to 0.005 inch). The length of these zones, called stripes preload is less than the length of the sleeve.

Specialists in this field of technology will be able to appreciate that in the process of machining the holes 42, and the housing 52 may first be treated rough diameter of the second section 45, and then the diameter of the first section 43. After this can be handled by the actual diameter of the second section 45, and then the actual diameter of the first section 43, but only in the zone of interaction with him plot 53. Thus, it can be actually received three (3) diameter: actual diameters of sections 43 and 45 and a rough draft finished diameter section 43, which is less than the desired diameter of the section 43 of 0.25 mm (one ten thousandth of an inch).

The housing 52 of the sleeve 50 has a hole 64, coaxial with the axis 29 of the insert when the latter is in the sleeve. Clove 12 is inserted into this hole 64 for rotation. The shank 24 of the insert 12 has a slightly smaller diameter than the hole 64, and is retained in the bore by the retaining ring. The shank can be rotated around the Central axis 29 to eliminate uneven wear of the tip 30 of the insert 12. Area 28 tooth what s the notches.

Reducing the magnitude of the maximum load in the zone of abutment of the flange 54 to the housing 52 of the outer surface 52a of the latter is "the first conical section 55A, tapering inward from the section 53 to the flange 54 with the formation of the tapered section 80, the diameter (indicated by the letter "A" in Fig. 8) which is at the junction of the flange 54 preferably about is 45.7 mm (1,800 inch), less than the diameter of section 43. As shown in Fig. 8, block 80 preferably tapers at an angle (indicated by the letter "B" in Fig. 8) of about 10o. In addition, in this embodiment, the area of the inner surface 56 of the flange 54 attached to the housing 52 has a second tapered section 84, tapering inward at an angle (indicated by the letter "C" in Fig. 8) of about 10o. At the junction of the first section 55A with the second section 84 is preferably formed radius 92. The outer edge of the second section 84 is preferably at a distance (indicated by the letter "D" in Fig. 7) about 4,06 mm (0.16 in) from the outer surface 53. Specialists in this field of technology will be able to evaluate the advantage of the fact that section 80 of the housing 52 and section 84 of the surface 56 of the flange 54 together form the area of the undercut, indicated generally Romero, which contains less material than in the neighbouring parts of the body 52 and ring 54. It should also be noted that the zone 90 is used for distribution of stresses in the zone of abutment of the flange 54 to the housing 52, which ultimately reduces the maximum load occurring in this area.

In another embodiment, shown in Fig. 9 and 10, where the same elements have the same item numbers as in the above example, and similar elements are numbered positions, increased by 100, the sleeve 150 has an elongated body 152 and the flange 154. In this embodiment, the inner surface 156 of the flange 154 is essentially perpendicular to the axis 29, passing through the sleeve 150. The outer surface 152a of the housing 152 has a tapered section a, tapering inward from section 153 to the flange 154 with the formation of the conical section 180, diameter (indicated by the letter "E" in Fig. 10) in which the junction area 180 to the flange 154 is preferably approximately 46,1 mm (1,815 inch), that is less than the diameter of section 153. As can be seen in Fig. 10, plot 180 preferably tapers at an angle (indicated by the letter "F" equal to 10o. Specialists in this field of technology will be able to appreciate the advantage that ucast the junction of the flange 154 to the housing 152 of the sleeve, to reduce thereby created in this place maximum loads.

In Fig. 11 and 12 depict another preferred embodiment of the sleeve. As seen in these drawings, the sleeve 250 has an elongated housing 252, the flange 254 and other characteristics of the sleeve 50, with the exception of the distinguishing features, which are listed below. In particular, in this embodiment, the sleeve edge section 253 essentially parallel to the axis 29. The area of the inner surface 256 of the flange 254 adjacent to the housing 252 has a conical section 284, tapering inward at an angle (indicated by the letter "G" in Fig. 12), constituting 10o. The outer edge of section 284 is preferably at a distance (indicated by the letter "H" in Fig. 12) about 4,06 mm (0.16 in) from the outer surface of section 253. It should be noted that in the zone of abutment of the flange 254 to the housing 252 section 284 forms a zone 290 undercut in the flange 254 to distribute loads encountered in this place, which ultimately reduces the maximum load in this area.

In Fig. 13 and 14 depict another embodiment of a sleeve. As seen in the drawings, the sleeve 350 is elongated housing 352 and the flange 354, which has an inner surface 356 and moderately cutting insert of the type indicated above. The outer surface of the flange 358 354 preferably has a tapered section 360 and a flat plot 362. The body 352 of the sleeve 350 has an outer surface a, including three sections of different diameters, namely a first section 351, the second section 353 and the third section 355. The second section 353 of the sleeve 350 is the size providing an interference fit between this section 353 and the first section 43 of the holes 42 in the holder of the cutting insert. Similarly, the first and third segments (351, 355) sleeve 350 have smaller diameters. For example, the diameter of the first section and the diameter of the third section preferably 0,794 mm (one thirty-second of an inch) smaller than the diameter of the second section between the second section 353 of the sleeve 350 and the first section 43 of the holes 42 formed one stationary landing, and between the third section 355 of the sleeve and a second section 45 holes 42 formed by the second stationary landing. Areas, respectively, 43, 45, 353, 355 are of sufficient length, so that between the sleeve 350 and the holder of the cutting insert is formed zone without tension. The magnitude of the interference fit respectively between the sections 43 and 353 and 45 respectively and 355 is preferably from 0.05 to 0.127 mm (0.002 to 0.005 inch). The length of these zones, called bands of tightness, less the ways of execution can be performed in combination with the holders of other types, however, it is preferable to make them as described in U.S. patents NN 5088797 and 5302005, that is, by providing a fixed landing between the sleeve and the holder of the cutting insert. Preferably such fixed landing allow you to remove the sleeves from the respective holders of the cutting insert manually using a chisel or hydraulic device, while the holder remains attached to sarubobo drum mountain harvester. Chisel or hydraulic device allows to overcome the resistance of the bands of tension and remove the plug from the holder.

As described above, the preferred values of the forces required for installation or removal of the sleeve are approximately 6804 up 18144 kg (from 15,000 to 40,000 pounds). It should be noted that the device for fastening the cutting insert may also find application in zarubinyh mechanisms that do not have a rotating drum, for example in the mechanisms that give cutting insert only rectilinear motion. In addition, sarunya mechanisms, which can successfully be used in the present invention find application in other areas, for example in devices for removal of pavement or any other devices for prorubky hard on oasim description can also appreciate that, what the above bushings allow to solve many of the problems associated with securing the cutting inserts on the rotary drums mining machines or other digging device. In addition, it should be noted that the running zone of the undercut in the flange and/or in the housing is pressed sleeve at the junction of the flange to the housing increases life of the sleeve and reduce machine downtime needed to replace damaged bushings. It should be borne in mind that there may be various changes in details, materials and arrangement of parts described herein and represented in the drawings to clarify the essence of the present invention, within the principle and scope of the invention set forth in the attached formula.

1. The device for fastening the cutting insert (12) having an elongated shank (24) and the belt (28), Zarubina element (10), is arranged to move in the direction of the notches in the holder (18) of the insert having a base (40), made with the possibility of attaching to sarubobo element (10), and Cabinet portion (38) having a rear end (39) facing in the opposite direction from the direction of the notches, the front end (41) facing towards the end (41) hull (38) to the rear end (39) and forming its inner surface (42A), containing sleeve (50) having a circular casing (52), made with the possibility of installation in the hole (42) in hull (38) through its front end (41) and having an outer surface (52a) and the flange (54), located at one end of the housing and having an outer surface (58) and the inner surface (56), which provides for interaction with a contact surface (44) of the holder to prevent axial movement of the sleeve (50) toward the rear end (39) hull (38), the sleeve (50) has an opening (64) in which is mounted for rotation a shaft (24) of the cutting insert (12) so that the belt (28) communicates with the outer surface (58) of the flange (54) and holding means (53) located on the outer surface (52a) of the sleeve (50) that serve to create a static landing between the inner surface (42A) of Cabinet of the holder and the outer surface (52a) of the housing sleeve and designed to prevent rotation and axial movement of the sleeve(50) with respect to the base (40) during operation, while the outer surface (52a) of the housing (52) of the sleeve (50) has a conical section (55A), adjacent to the flange (54) and/or the inner surface (56) of the bearing (54) has a conical section (84), with the third of the diameter of its area within the fixed landing education in the housing (52) and/or the flange (54) of the sleeve (50) zone undercut.

2. The device under item 1, in which these conic sections (55A, 84) is performed on the outer surface (52a) of the housing (52) and on the inner surface (56) of the bearing (54), and the junction of these sections to each other is formed with a rounded surface (92).

3. The device under item 1, in which means (53) of the retaining sleeve (50) includes at least one strip stationary landing, the length of which is less than the length of the outer surface (52a) of the housing sleeve and which is located between the inner surface (42A) of Cabinet of the holder and the outer surface (52a) of the housing sleeve.

4. The device under item 1, in which means (53) of the retaining sleeve (50) includes at least one strip fixed landing between the inner surface (42A) of Cabinet of the holder and the outer surface (52a) of the housing sleeve, and the sleeve (50) is cylindrical.

5. The device under item 1, in which means (53) of the retaining sleeve (50) includes at least two separate strips fixed landing between the inner surface (42A) of Cabinet of the holder and the outer surface (52a) of the housing sleeve.

6. The device is mportant landing between the inner surface (42A) of the hull of the holder and the outer surface, and the sleeve (50) is cylindrical.

7. The device under item 1, in which the sleeve (50) has on its outer surface (52a) near the front end of the hole (42) (53) of enlarged diameter, and the aperture (42) has near its front end area (45) of reduced diameter, so that between the outer surface (52a) of the housing sleeve and the inner surface (42A) of the hull of the holder are two lanes of stationary landing, one of which is in the area of increased diameter of the outer surface (52a) of the housing sleeve, and the other is in the area of reduced diameter of the inner surface (42A) of the hull of the holder.

 

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