Tooth bucket

 

(57) Abstract:

The invention relates to earth moving equipment, namely to shovel cyclic actions, and can be used in the mining industry. Tooth bucket excavator includes a wedge-shaped working part formed convex upper and concave lower curved faces formed by the mating cylindrical surfaces, stiffeners and a cutting part that is offset from the longitudinal axis of the tooth and having a cylindrical surface, and the tail part with the support surfaces. The cutting part is shifted downwards relative to the longitudinal axis of the tooth by the amount of 0.10 to 0.14 from the length of the working portion of the tooth and the radius of the cylindrical surface is equal to 20 mm, a Wedge-shaped portion of the tooth is made with an acute angle of 10-15obetween the convex upper and concave lower curved faces. The radii of the cylindrical surfaces forming the convex upper and concave lower curved edge portion and the lower ribs on the concave curved face in the area of the working part, accepted the same. The supporting surface of the tail part is made inclined with an angle of 9-11oand Podhale shrinkage of the shell, not facing the work surface. Increases wear resistance and service life. 2 Il.

The invention relates to earth moving equipment, namely to shovel cyclic actions, and can be used in mining and construction for the destruction and excavation of rocks and soils any strength after or without prior cultivation.

The famous tooth of the bucket containing the tail to attach the tooth to the front wall of the bucket, and a wedge-shaped working part formed convex front and rear curved concave surfaces and is made with offset cutting edge downwards relative to the longitudinal axis of the tooth [1]. This form of the tooth selected for reasons of reduction of the pressure force when the cutting into the soil, provide the same cross-sectional area of the cutting tooth wear, i.e., the ability to Samogitian, and increase the service life of the tooth.

However, the teeth of such form as wear and tear during operation quickly Satupaitea, wear (abrasion) only 1/5 of the length of the working part sharply stopset tooth and increases the radius of the cutting edge in 2,0-2,5 times, further wear turns the tooth in a blunt blank Illichivets and pressure force when cutting in soil and rock. The tooth does not contain edges and in the working part is made excessively massive, that does not meet the requirements of steel parts during casting and heat treatment.

Closest to the invention to the technical essence and the achieved result is a tooth bucket, including a tail portion with a support surface, a wedge-shaped working part formed convex upper and concave lower curved faces formed by the mating cylindrical surfaces, stiffeners and a cutting part that is offset from the longitudinal axis of the tooth up and on lateral sides of the working part is made visors [2]. It is assumed that the use of this tooth form allows you to increase the service life of the tooth and the anterior wall of the bucket by reducing their wear and tear.

However, this form of tooth though and allows you to reduce wear and increase service life, but when the wear of the tooth as in the previous example, sharply Satupaitea, for example, by stitching only 1/5 the length of the working portion of the cutting edge Satupaitea 2-3 times, further wear more stopset tooth. The cutting part is displaced relative to the longitudinal axis of the tooth up, which leads to increased crinoline length from the cutting edge not arabena and durability is ensured by increasing the thickness, the tooth must to do overly massive and it is difficult to ensure a high quality metal casting and heat treatment. The shank of the tooth is thin supporting part of constant thickness, which can easily break off when the inevitable in the operation of the loosening of the tooth on the front wall of the bucket. In General, the teeth of this design seems excessively heavy, the weight of the tooth is additionally increased due to the side visors, which complicates the mounting of teeth you are replacing. However, the increase in mass has not led to a corresponding increase in operational performance (to reduce wear and increase service life of the tooth). As for the wear protection of the front wall of the bucket side visors, you should be aware that the tooth is completely worn on hard rocks for 5-10 days, and the front wall of the bucket works of the Holy six months and to protect her visors tooth uneconomical, because the consumption of metal for visors is significantly greater than the reduced durability of the front wall of the bucket, additionally, the increased mass of the tooth and the deterioration in processability due to the increased thickness of the body of the tooth in the area of the peaks.

The aim of the invention is to increase the durability and life of the case is the processing.

These goals are achieved with the complex issues of official correspondence and maintainability of the tool. Increased service life achieved by reducing the amount of wear of the working parts of the tooth due to the reduced pressure of the efforts in the implementation of a tooth in the breed and to reduce friction on the convex upper and concave lower curved faces of the working part. This effect is realized, first, through the use of rational tooth shape: applications most pointed wedge-shaped working part with angle = 10-15between the convex upper and concave lower curved faces, bias cutting down relative to the longitudinal axis of the tooth on the value of h, component 0,10-0,14 from the length of the working portion of the tooth, and performing the cylindrical surface of the cutting radius R1=20 mm, and used for the design of the upper and lower curved faces of the working part and the lower ribs on the concave curved face in the area of the working part cylindrical surfaces of the same radius R2(for example, tooth bucket capacity of 8 m3-R2= 1000 mm); secondly, to improve the quality of the metal by careful consideration of technological issues the current edge to the shank, the use of ribs and intentionally getting in the heating of the casting at the transition from the working side to the shank) of the cavity in the form of shrinkage of the shell. Reducing the likelihood of sudden failure due to the rational design of a working part and a lower pressure force when the implementation of a tooth in the breed, the highest quality metal after casting and heat treatment, strengthening the supporting part of the shank by performing the supporting surfaces inclined with an angle = 9-11and rise towards the body of the tooth. The mass reduction of the tooth is achieved by tapering the working part, reducing the thickness of the body of the tooth and rational working beading and tail parts, use the internal cavity at the junction of the working parts in the tail. Improved processability in molding and heat treatment is the removal of arrays of metal and thermal units in the casting, and through the use of a cavity in the form of shrinkage of the shell in any place of the tooth wall thickness does not exceed 60-80 mm (for teeth of different sizes), which provides end-to-end hardenability of the tool during the heat treatment.

In Fig. 1 shows the proposed tooth bucket, side view; Fig.2 - same, ventral view.

2. The cutting edge 6 is also decorated cylindrical surface, but much smaller radius (R1=20 mm). In the massive part of the tooth (where the pairing of the working and tail parts) in the body of the tooth is provided by the cavity shrinkage 9. In Fig.1 thin lines 10 shows the sequential change of location and shape of the cutting edge of the working portion of the tooth when worn. To increase the strength and rigidity of the shank support surface 2 tail executed inclined angle = 9-11and rise towards the body of the tooth.

The tool works as follows. Under the action of the actuator and the transmission mechanism of the front wall of the bucket implements the teeth in the erodible solid rock or soil. Destructible rock moves along the top intensively abraded on rock or soil. According to experimental data the wear of the working parts from the cutting edge in three-shift work with hard rock can be 40-80 mm/day. Through the use of a sharp wedge rational profile in the proposed design reduces the pressure of the efforts in the implementation of tooth formation, friction and wear. Additionally, the wear-resistance due to high quality of metal in the working part of the tooth after casting and heat treatment.

The design of the teeth and the technology of their production improved production conditions on Oskolsky plant of metallurgical engineering, testing conducted at Lebedinsky GOK. Tests are performed for large series of teeth (thousand units) on different rocks. When using the teeth of the proposed design in the most difficult conditions section 1 Lebedinsky GOK on the rocks XVII-XX category of strength Protodyakonov mean time the rock was on excavators with bucket capacity of 8 m3in 1998 - 5475,5 m3in 1999 - 5741,7 m3in 2000 - 5372,6 m3. A small set (10 pieces ) of elongated teeth similar construction was given in 2000, the average life 5783,3 m3. The maximum operating time is much higher, separate sually more 1.7-2.6 times, than the mean time for teeth other designs in the same conditions. Greatly reduced and the likelihood of breakage of the teeth: in 2000, used Lebedinsky GOK 2288 teeth broke only 55, i.e., to 2.3%, while the teeth of the other designs from 6,9 to 40.0%. In the process of improving the design of the instrument, the mass of the tooth for excavator bucket capacity 8 m3was reduced from 200 to 190 kg, while saving valuable metal and facilitates mounting of the teeth when replacing in a production environment.

Sources of information

1. Tooth bucket. Auth. St. USSR. 192081. CL. E 02 F 9/28. - Appl. 11.03.63. - Publ. 26.01.67., bull. 4. Authors: Chukmasov C. F., Babchenko C. L.

2. Tooth bucket. Patent of the Russian Federation. 2107779. CL. 6 E 02 F 9/28. - Appl. 14.06.96. - Publ. 27.03.98., bull. 9. Authors: Sychev K. K., Ershov, Y., Ivochkin Century A.

Tooth bucket, comprising a wedge-shaped working part formed convex upper and concave lower curved faces formed by the mating cylindrical surfaces, stiffeners and a cutting part that is offset from the longitudinal axis of the tooth and having a cylindrical surface, and a tail portion with a support surface, otlichit the length of the working portion of the tooth, and the radius of the cylindrical surface is equal to 20 mm, a wedge-shaped portion of the tooth is made with an acute angle of 10-15obetween the convex upper and concave lower curved faces, while the radii of the cylindrical surfaces forming the convex upper and concave lower curved edge portion and the lower ribs on the concave curved face in the area of the working part, accepted the same, and the supporting surface of the tail part is made inclined with an angle of 9-11oand rise towards the body of the tooth, and in the body of the tooth in place of the pair of the working part is provided with a tail cavity in the form of shrinkage of the shell, not facing the work surface.

 

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The invention relates to the mining industry and can be used to equip the working bodies of the mining and earthmoving machines

FIELD: earth-moving equipment.

SUBSTANCE: proposed excavator tooth unit contains holder with main part and nose part, both arranged coaxially relative to longitudinal axial line of holder. Main part is made for fastening said holder to excavator. Nose part terminates in free front end and it has upper and lower surfaces located mainly respectively higher and lower than longitudinal axial line of said holder. Upper surface of said nose part has two inclined sides arranged at opposite sides from longitudinal axial line and in front relative to rear end of said nose part over its length. Each inclined side of said upper surface is arranged at angle of 25-65° to horizontal plane. Lower surface of said nose part has two sides arranged at opposite sides relative to longitudinal axial line of said holder. Cavity made in said nose part comes to one of inclined sides of said upper surface of nose part of holder, being arranged along axis intersecting opposite sides of upper and lower surfaces of said nose part at angle of 30-60° to horizontal plane. Excavator tooth has front and rear end parts. Blind space open to rear end of said tooth and designed for fitting-in section of nose part of holder is made in rear end part of said tooth. Tooth is provided with hole arranged in working combination with inclined cavity of holder when tooth and holder are in working connection. Pin-type locking device is provided being arranged in cavity of said holder and at least partially passed through hole in said tooth for detachable fastening of tooth and holder in working connected. Tooth and holder described in invention form with tooth unit a ground of inventions.

EFFECT: improved reliability of excavator tooth unit.

40 cl, 31 dwg

FIELD: excavation equipment, particularly small metalwork for digging elements.

SUBSTANCE: unit for wearing and supporting members has replaceable tooth head and holding structure including intermediate holder with front part of front end arranged in pocket of rear end of tooth head and complementary thereto. Front part is secured in the pocket by the first glut pin structure. Holding structure also has main holder with front part of front end complementarily inserted in pocket of rear end of intermediate holder and secured in the pocket by the second glut pin structure. Rear end of main holder is operatively secured to cutting blade of excavator bucket. Each front part have oval configuration elongated in horizontal direction. Glut pin structures extend in horizontal direction. Front parts have reinforcing projections arranged in orifices adapted to secure front parts. Holder and tooth head are provided with mating ribbed areas.

EFFECT: reduced unit size, improved power and working characteristic, as well as wear-resistance characteristics.

40 cl, 7 dwg

FIELD: dredgers or soil-shifting machines for special purposes, particularly to cut chaps in ground.

SUBSTANCE: device comprises at least one cutter brought into rotation and at least one the first cutting member to cut ground during cutter rotation in the first direction. At least one the second cutting member for ground cutting rotated in the second direction opposite to the first one is installed on the cutter. At least one of the cutting members may be shifted from the first ground cutting position to the second diverted position. Executive tool to shift the cutting member between the first and the second positions is also provided.

EFFECT: increased cutting ability in both rotational directions, prevention of excessive cutting member wear.

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SUBSTANCE: parallelepiped inserts are fitted in tooth point and inserts of cylindrical form are fitted further on along working plane. Inserts manufactured of wear-resistant cast iron, owing to shadow effect, prevent intensive abrasive wear of steel base, thus increasing service life of tooth. As wear-resistant inserts are arranged only on one of working surfaces, other surfaces (opposite one) is subjected to more intensive wear which provides finally sharpening of tooth in process of operation. Use of such design and method of manufacture make it possible to increase service live more than two times and provided reliability of operation of excavator dipper.

EFFECT: increased service life and provision of self-sharpening of tooth point owing to fitting-in small size wear-resistant cast iron parts in steel base.

4 cl, 4 dwg

FIELD: mining and building, particularly material shifting devices adapted to releasably connect replaceable bit of excavation tooth with transitional extension structure fastened thereto.

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EFFECT: simplified working tool replacement.

51 cl, 5 dwg

FIELD: mining industry.

SUBSTANCE: invention can be used in working members of mining and earth-moving machines, particularly, in machines for digging hard and frozen soils. Proposed ripper point for breaking hard and frozen soils has shank with slot for fastening, and wedge-like working part formed by front end surface, two side surfaces and rear surface. Working part of front end surface located in place of intensive wear is reinforced along longitudinal axial line H-H by three of stress concentrators, being round elements projecting over front end working surface and dipped into body of point. Distance L between concentrators in row and distance 1 between rows is equal to triple value of their diameter.

EFFECT: reduced effort to applied to small soil, reduced power consumption for ripping, increased service life of ripper point.

3 dwg

FIELD: mining, particularly excavation equipment for detachable connection of replaceable tooth crown in earth-shifting machine.

SUBSTANCE: device comprises the first and the second telescopically joined members, aligned orifices formed in the members and adapted for connector receiving and connection finger unit for forced retention of the first and the second members so that the members are telescopically arranged one relatively another. Connection finger unit comprises body, fixing member and resilient stop member. The body is arranged in the aligned orifices so that the body may be removed therefrom. The connector prevents separation of the first member from the second one. The body also has channel opened in outer surface thereof and having non-round side surface section. Fixing member is arranged in channel and limited by side surface section. The fixing member may rotate with respect to the body from fixing position into releasing position and in reverse direction. Resilient stop member is connected with fixing member so that the stop member may rotate together with fixing member. The stop member is adapted to retain fixing member in fixing position. The stop member has periphery delimiting fixing member. The periphery is slidably joined with non-round side surface section so that the periphery and the side surface are mutually complementary.

EFFECT: increased efficiency of connection unit for wearing and support member connection.

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EFFECT: simplified design of cog unit for manufacturing, lower costs, avoidance of cog disconnection from adapter under severe operation conditions.

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SUBSTANCE: proposed device comprises tooth arranged in adapter and connecting element with sleeve made from elastic deformable material, and key. Said tooth and adapter have holes and zones to receive said sleeve and key. Note that said key is inserted into sleeve to extend therefrom. Note also that said key is fitted aligned with sleeve to displace therein, while sleeve is arranged in adapter part. Key has end part that makes key base, and key head on the body opposite part. Key head has part that makes bearing surface with shifted center. The latter enters appropriate surface made in the tooth first hole. Key head end can be turned by actuator element. Key base has anchoring appliance that enters in elastically deformable sleeve due to first tightening preset-force action. Key base end has conical part that thrusts against tooth second hole making second tightening action exceeding aforesaid one and created by key turn. Key turn governs is shift relative to its initial axis and allows its locking by anchorage on either tooth metal components or different bearing zones.

EFFECT: appropriate locking of tooth-adapter link, higher labor safety.

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SUBSTANCE: group of inventions relates to the field of mining and construction, in particular, to rotary cutting tool, which may be used to pierce through thickness of soil. Rotary cutting tool includes body, which has axial front end and axial back end, and also axial length. Hard tip, which has remote end, is fixed to body of cutting tool at its axial front end. Body of cutting tool has a section of back surface, arranged along axis behind remote end of hard tip, and having transverse dimension. Section of back surface includes axial front transverse dimension and minimum transverse dimension, which is located along axis behind axial front transverse dimension. Axial front dimension exceeds minimum transverse dimension. Section of back surface has axial length within the limits from approximately 10% to 35% of axial length of cutting tool body.

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32 cl, 9 dwg

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