Forward-stroke executive mechanism

FIELD: electric machinery, particularly electromechanical power equipment, for mechanical engineering, metallurgy and so on.

SUBSTANCE: mechanism comprises body. Electric motor, bearing-carrying screw with pulleys and driving belt and driving belt tension control means are arranged on the body. Protective pipe is located in the body. Installed in the protective pipe is bush arranged so that the bush may slide in longitudinal direction along guider inside the bush by means of rod with power nut and head. Dowel of rod rotation prevention means and bearing clamping nut are secured to inner surface of protective pipe. The bearings are connected to screw through intermediate bush. Mechanical retaining means, which fixes bearing clamping nut inside the body, is located on the bearing clamping nut. Protective pipe is provided with inductive end switches. Stops are inserted inside protective pipe from both ends thereof. Longitudinal groove, radial orifice and outer bead are provided in rod end. The outer bead may cooperate with the stops. Insert is introduced into longitudinal groove and radial orifice so that the insert encloses the dowel by side surfaces thereof. The insert is provided with projection arranged in dowel slot of power nut located inside the rod. Intermediate bush is made as an integral part and connected to screw by means of fixing member installed in place of any bearing installation.

EFFECT: increased reliability.

5 cl, 6 dwg

 

The present invention relates to the field of electrical engineering, namely, Electromechanical power devices, in particular to linear Executive mechanism for moving the working bodies of the various aggregates, such as the punch hopper of the cell, and can be used in various fields of engineering, metallurgy and so on

Known linear Executive electromechanism (patent of Russian Federation №2186451, CL. NC 7/10, 7/06) comprising a housing with a protective tube that contains the motor, the screw conduit, the piston rod of the power nut and ferrule, the device damping of shock loads.

However, this electromechanism has the following disadvantages:

increased axial clearance due to the coaxial arrangement of the motor housing, as well as the design complexity due to the presence of special damping device.

In addition, the known linear Executive electromechanism Firm "Servomech" (Italy) series UAL 2...4 (Servomech.ru page 5, 97, 98), which was the prototype of the present invention and comprising a housing that contains the electric motor with its flange and screw with pulleys and a drive belt, the protective tube with the guide sleeve made of a soft material (such as PTFE), to the th placed with the possibility of longitudinal movement of the rod with the power nut (also of soft material, for example bronze), the key device antipoverty rod fixed to the inner surface of the protective pipe, nut clamp bearings mounted on the screw through the composite intermediate sleeve, inductive limit switches, mounted on a protective tube.

However, this electromechanism has the disadvantage of low reliability. This is due to the following reasons.

At full extension or retraction of the rod may be hitting the end of the power nut on the guide sleeve or on the intermediate sleeve bearings, respectively. When the high speed shaft of the blow may damage the contact surfaces of these parts, because of the power nut and the guide sleeve is made of soft materials.

As you know, the working stroke is limited inductive limit switches (KB).

The above raids of power nut and possible damage may occur due to failure of KB, improper installation, as well as changes in operating conditions, because the total stroke is determined not only by the installation of KB, but its moving (overrun), the value of which depends on your efforts on the rod and temperature.

Therefore, stationary, unregulated installation of KB used in the prototype can also privest is to the above attacks and damage when changing operating conditions.

Moreover, when Electromechanical force from the key device antipoverty rod acts directly on the power nut that can be turned out of stock, and the intermediate composite sleeve and clamp it on the screw nut also leads to a decrease in reliability, because this nut can also be turned out during the operation.

In addition, in the specified electromechanism not provided to adjust the tension of the belt, which when used in the additional tension of the belt may cause the failure of the latter, it does not include feeder lubrication directly to the elements of the power a pair of screw-nut, which can lead to increased wear and failure.

Also nut clamp bearings made without reliable mechanical locking against rotation in any position that may lead to oslavany axial preload of bearings, the screw is released and the failure of the power nuts.

The task of the invention is to improve the reliability of Electromechanical.

This object is achieved in that in the linear Executive electromechanism, comprising a housing that contains the electric motor with its flange and screw on the bearings with pulleys and a drive belt, the protective tube placed in her napravlyayus the sleeve with the possibility of longitudinal movement of the rod with a power nut and ferrule, the key device antipoverty rod fixed to the inner surface of the protective pipe, nut clamp bearings mounted on the screw through the spacer sleeve, inductive limit switches, mounted on a protective tube, put the device controlling the tension of the belt located on the housing, a device for supplying lubricant located on the tip and mechanical unit locking nut clamp bearings in the housing, placed on it, while in the inner part of the protective tube from both sides entered the stops at the end of the rod performed a longitudinal groove, a radial bore and an outer flange that is installed with the opportunity to interact with the stops, and in the longitudinal groove and the radial hole of the inserted liner, which covers side surfaces of the plug and provided with a protrusion located in the key groove of the power nut placed inside the rod and the intermediate sleeve is made whole and connected to the screw fixing element, installed at the location of any bearing.

Also stops in the inner part of the protective tube can be made in the form of a flat ring springs.

In addition, the device controlling the belt tension can be made in the form of two oppositely directed wedges, tied Crepin the m element, and the case is equipped flats and wedges installed their support surfaces on the flats of the body and beveled surfaces on the cylindrical flange of the electric motor in the casing transverse grooves for accommodating fastening elements of the motor.

In addition, the mechanical unit locking nut clamp bearings can be made in the form of at least one threaded element mounted in at least one hollow face groove of the nut, made with the release of its threaded portion, and the groove width is equal to the outer diameter of the threaded member and the threaded nut and the threaded element is made with the same step.

Also electromechanism can be provided with at least one installed in a protective tube plate and cover with end-to-end and a hollow longitudinal groove, respectively, with inductive limit switches fixed in the through-groove planks, and their sensitive part is placed in the hollow groove of the lid, the lid is installed in the window of the protective pipe and the flange of the rod at the location of the cover are the flats.

Figure 1 shows the section of the proposed electromechanism, figure 2 - section a-a in figure 1, figure 3 - cross-section B-B in figure 1, figure 4 is a view In figure 1, figure 5 - view of G on figure 4, figure 6 - section d-D in figure 2.

The proposed electromechanism (figure 1) which contains the casing 1, on which is mounted an electric motor 2 with its flange 3 and the screw 4 bearing 5 with the pulleys 6 and 7 and a drive belt 8. In the protective pipe 9 in its guide sleeve 10 is placed a rod 11 with a power nut 12 and tip 13, and in its inner part still installed lugs 14 and 15, made in the form of a flat ring springs, and the key 16 fixed to the protective tube 9 by screws 17 (figure 2). At the end of the rod 11 is made of the outer flange 18, and a longitudinal groove 19 and the radial bore 20, into which are inserted the liner 21 having an inner side surface 22 and the protrusion 23. The liner 21 and the side surfaces 22 covers the key 16, and its protrusion 23 is in the keyway 24 of the power nut 12, which is entirely located inside the rod 11 and is fixed by a ring 25. The bearings 5 (figure 1) is installed on the screw 4 through the one-piece intermediate sleeve 26, which is connected with it locking element made in the form of a pin 27 and installed at the location of any bearing 5, i.e. under it.

On the housing 1 (Fig 3) the flats 28 on which you installed the wedges 29 and 30, tightened by a screw 31 and grooves 32, in which is placed the elements 33 of the fastening of the electric motor 2.

Tip 13 (1) a radial hole 34 with the inserted device for supplying lubricant, such as grease-35, and an axial hole 36, the connecting hole is ment 34 and the inner cavity of the stem 11.

In a threaded hole in the housing 1 a nut 37 (figure 4 and 5), in which the at least one hollow end of the groove 38 with access to the threaded part, which is inserted at least one pressure threaded element such as a screw 39, the width of groove 38 "b" is equal to the outside diameter "d" of the screw 39, i.e. b=d, and thread the nut 37 and the screw 39 is made of the same step.

On the protective tube 9 is mounted at least one strap 40 (2 and 6) with a continuous longitudinal groove 41 and the cover 42 with a hollow longitudinal groove 43, and inductive switches 44 is fixed in the through groove 41 of the strap 40 by nuts 45, and their sensitive part 46 is placed in a hollow groove 43 of the cover 42, the latter is installed in the Windows 47 of the protective tube 9, and the flange 18 of the rod 11 at the location of the cover 42 is made the chamfer 48.

Electromechanism works as follows.

Reverse rotation of the motor shaft 2 is transmitted through the pulleys 6 and 7, a drive belt 8 by the screw 4, the engagement of its threads with the power nut 12, and since the rod 11 together with the nut 12 is fixed against rotation stationary housing 16 through the liner 21, the rod 11 performs reciprocating motion, moving the tip 13, which is connected with the working body (figure 1 not shown). In emergency conditions the possible impact of the flange 18 of the rod 11 on the annular spring 14 and 15, which soften the blows, not p is Evodia to damage. The axial force through the bearings 5 perceive the intermediate sleeve 26 and the pin 27, while the other parts mounted on the screw 4 (for example a pulley 7), this effort has no effect. The placement of the pin 27 under the bearing 5 excludes loss during the rotation of the screw 4.

Regulation of the magnitude of the tension of the belt 8, as well as its lift during operation carried out by the turn of the screw 31 in the preliminary weakening elements 33 of the fastening of the electric motor 2. While the wedges 29 and 30 are moved and affected by their slanted flange 3 of the motor 2, by changing the distance between axes of the latter and the screw 4, and hence the pulleys 6 and 7, thus altering the tension of the belt 8. The elements 33 together with the motor 2 is moved relative to the grooves 32 of the housing 1. After this adjustment elements 33 are again tightened.

Replenishment of lubricant during operation is performed through the fitting 35, and the lubricant is fed through the holes 34 and 36 of the tip 13 to the inside of the rod 11 at the front end of the screw 4.

Tightening the bearing 5 by a nut 37 is made in the usual way, and then in the groove 38 of the nut 37 is introduced to the pressure screw 39 is tightened all the way into the bottom of the groove 38, and the screw 39 engages with the thread of the housing 1 (threaded connection in this case - eccentric) and stoparic nut 37 from provorotov any position.

During operation possible further tightening of the bearings 5 nut 37 in the preliminary loosening of the screws 39.

For regulating the stroke of the piston rod 11 is moved KB 44 in the slots 41 and 43 of the strap 40 and the cover 42 in the preliminary loosening of the nuts 45. KB 44 responsive to the presence or absence of their sensitive part 46 of the outer surface of the stem 11. Running blind groove 43 in the cover 42, and the flats 48 on the flange 18 of the rod 11 allows you to bring sensitive part 46 to the surface of the latter at the desired working gap, which is typically 2...5 mm, preserving the integrity of the protective tube 9.

Thus, in the proposed electromechanism unlike the prototype provided softened emergency hitting the stock internal stops, and the piston rod, which are manufactured from high quality steel, itself, and not force the nut takes efforts from key antipoverty and from the stops, while the dynamic pressure from the stops can exceed the rated many times, especially at high speeds of movement of the rod in the vertical direction.

The intermediate sleeve integral with the locking element, and nuts clamping the bearings with the proposed stopping increases the reliability of fixing the bearings on the screw and housing.

Put the device controlling the belt tension on the allows to set the desired amount of tension as during adjustment, and during operation, increasing the resource of a belt transmission and reducing the number of outputs it down.

Put the device path of the lubricant allows you to fill and refill the grease inside the cavity of the shaft, lubricating the power transmission screw-nut, reducing wear and the probability of failure, with this device, located on the handpiece allows refilling lubricant for any departure of the stem.

In addition, the proposed electromechanism possibility of longitudinal movement KB and, consequently, the ability to control the magnitude of the stroke of the rod to exclude assaults on emergency stops, causing increased wear of the power nut, when the changed conditions of operation.

Thus, the proposed electromechanism has a higher reliability.

1. Linear Executive electromechanism, comprising a housing that contains the electric motor with its flange and screw on the bearings with pulleys and a drive belt, the protective tube is placed in its guide sleeve can be moved by the piston rod of the power nut and ferrule, the key device antipoverty rod fixed to the inner surface of the protective pipe, nut clamp bearings mounted on the screw through the spacer sleeve, the inductive limit in the switch, mounted on the protective tube, characterized in that it is provided with a device for regulating the tension of the belt located on the housing, a device for supplying lubricant located on the handpiece, and a mechanical unit locking nut clamp bearings in the housing, placed on it, and in the inner part of the protective tube from both sides entered the stops at the end of the rod performed a longitudinal groove, a radial bore and an outer flange that is installed with the ability to interact with emphasis, and in a longitudinal groove and a radial hole of the inserted liner, which covers side surfaces of the plug and provided with a protrusion located in the keyway groove power nut placed inside the rod, the intermediate sleeve is made integral and are connected with screw locking element installed in the location of any bearing.

2. Linear Executive electromechanism according to claim 1, characterized in that the lugs in the inner part of the protective tube is made in the form of a flat ring springs.

3. Linear Executive electromechanism according to claim 1, characterized in that the device of the belt tension is made in the form of two oppositely directed wedges, tighten the fastening element, and the case is equipped flats and wedges installed your reference the surfaces on the flats of the housing, and the bevelled surfaces on the cylindrical flange of the electric motor in the casing transverse grooves for accommodating fastening elements of the motor.

4. Linear Executive electromechanism according to claim 1, characterized in that the device for mechanical locking nut clamp bearings made in the form of at least one of the adjusting threaded element mounted in at least one hollow face groove of the nut, made with the release of its threaded portion, and the groove width equal to the outside diameter of the threaded element, and the threaded nut and the threaded element is made with the same step.

5. Linear Executive electromechanism according to claim 1, characterized in that it has at least one strap with a through longitudinal slot installed in a protective tube, and cover with a blind longitudinal groove that is installed in the Windows of the protective tube, with inductive limit switches fixed in the through-groove planks, and their sensitive part is placed in the hollow groove of the cover, and on the collar of the rod at the location of the cover are the flats.



 

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