Die unloading tool

Abstract

The utility model discloses a mold unloading tool which comprises a machine frame, a mold unloading device, a mold unloading device, a mold unloading device, a mold unloading device and a mold unloading device. The mold unloading part is arranged on the rack in a lifting manner, is positioned above the workbench, and is used for downwards pressing out a movable insert on the shell; the locking mechanism is arranged on the workbench, the locking mechanism and the die unloading part are staggered in the horizontal direction, and the locking mechanism is used for applying downward acting force to the shell so as to press the shell on the workbench; and the driving part is arranged on the rack, is in transmission connection with the mold unloading part and is used for driving the mold unloading part to ascend and descend. According to the mold unloading tool disclosed by the embodiment of the utility model, the liftable mold unloading part and the driving part used for driving the mold unloading part to lift are arranged, so that the driving part can be used for driving the mold unloading part to move so as to press out the movable insert on the shell, and the mold unloading tool is convenient to operate, time-saving and labor-saving.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile parts production, especially relates to a die stripping tool. BACKGROUND

[0002] In the production process of the automobile gearbox shell, the shape of some parts needs to be formed by using movable inserts in the process of forming the shell by using a mold, and after forming, the movable inserts are buckled together with the shell. The original production operation needs to use a hammer to knock out the movable inserts from the formed shell, which is troublesome, time-consuming and labor-intensive. Therefore, a tool that is convenient to operate and saves time and labor is urgently needed to assist in die stripping. SUMMARY

[0003] The utility model aims at least to solve one of the technical problems existing in the prior art. Therefore, the utility model provides a die stripping tool which is convenient to operate and saves time and labor.

[0004] The die stripping tool according to the utility model embodiment is used to take out the movable inserts on the shell and includes:

[0005] The rack is provided with a workbench for supporting the shell.

[0006] The die stripping part is arranged above the workbench and can be lifted and lowered. The die stripping part is used to press the movable inserts on the shell downward.

[0007] The locking mechanism is arranged on the workbench and is offset from the die stripping part in the horizontal direction. The locking mechanism is used to apply a downward force to the shell to press the shell tightly on the workbench.

[0008] The driving part is arranged on the rack and is in transmission connection with the die stripping part, and is used to drive the die stripping part to lift and lower.

[0009] The die stripping tool according to the utility model embodiment has at least the following beneficial effects:

[0010] By arranging the lifting die stripping part and the driving part for driving the die stripping part to lift and lower, the driving part can be used to drive the die stripping part to press the movable inserts on the shell, which is convenient to operate and saves time and labor. In addition, by arranging the locking mechanism offset from the die stripping part in the horizontal direction, the locking mechanism is used to press the shell tightly on the workbench, so that when the die stripping part presses the movable inserts, the end of the shell away from the movable inserts can be prevented from being lifted, thereby ensuring that the die stripping part can smoothly press the movable inserts out of the shell.

[0011] According to some embodiments of the utility model, the die stripping part includes:

[0012] A connecting plate, which is connected to the output end of the drive unit;

[0013] A movable frame, which is vertically slidably mounted on the connecting plate;

[0014] A hammerhead, which is connected to the lower end of the movable frame and is used to contact the movable insert;

[0015] An elastic element is connected between the connecting plate and the movable frame, and is used to apply a downward elastic force to the movable frame.

[0016] According to some embodiments of the present invention, the movable frame includes:

[0017] A movable plate, located below the connecting plate;

[0018] Multiple first mounting rods are spaced apart on the upper surface of the movable plate and slide vertically through the connecting plate;

[0019] The first limiting nut corresponds one-to-one with the first mounting rod. The first limiting nut is threadedly connected to the first mounting rod and is located on the upper side of the connecting plate.

[0020] The elastic element is configured as a compression spring and is sleeved on the first mounting rod.

[0021] According to some embodiments of the present invention, a stop block is provided between the movable plate and the connecting plate to limit the travel distance of the movable plate when it approaches the connecting plate.

[0022] According to some embodiments of this utility model, the demolding fixture further includes:

[0023] The guide structure includes a guide seat and a guide rod. The guide seat is connected to the frame and has a vertically extending guide hole. The guide rod extends vertically and slides with the guide hole. The guide rod is connected to the demolding part.

[0024] According to some embodiments of this utility model, a triggering part is provided on the guide rod, and the demolding fixture further includes:

[0025] Two limit switches are vertically spaced apart on the frame and electrically connected to the drive unit;

[0026] The trigger unit is located between the two limit switches. During the lifting and lowering process of the unmolding unit, the trigger unit can trigger the two limit switches respectively to control the lifting and lowering stroke of the unmolding unit.

[0027] According to some embodiments of the utility model, the locking mechanism comprises:

[0028] The mounting portion is connected to the upper side of the workbench.

[0029] The pressing portion is vertically slidingly installed on the mounting portion and is used for abutting against the shell downward.

[0030] The pressing screw is threadedly installed on the mounting portion and is vertically distributed, and the pressing screw is used for abutting against the pressing portion downward to press the pressing portion against the shell.

[0031] According to some embodiments of the utility model, the pressing portion comprises:

[0032] The pressing plate is used for contacting the shell.

[0033] A plurality of second mounting rods are spaced apart on the upper surface of the pressing plate and are vertically slidingly arranged in the mounting portion.

[0034] The second limiting nut corresponds to the second mounting rod one-to-one, is threadedly connected to the second mounting rod, and is located on the upper side of the mounting portion.

[0035] According to some embodiments of the utility model, the workbench is provided with a vertically extending mounting column, the mounting portion is connected to the mounting column and can be rotationally adjusted around the central axis of the mounting column.

[0036] According to some embodiments of the utility model, the mounting column comprises a first section and a second section arranged in sequence from bottom to top, the diameter of the first section is greater than that of the second section and a stepped surface is formed, the second section is threadedly connected with a third limiting nut, the mounting portion is provided with a circular sleeve hole and is sleeved on the second section through the sleeve hole, and the mounting portion is located between the stepped surface and the third limiting nut.

[0037] Additional aspects and advantages of the utility model will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0038] The utility model will be further explained in combination with the drawings and embodiments, wherein:

[0039] Figure 1 It is the mounting structure schematic drawing of the mold stripping tool of the utility model embodiment;

[0040] Figure 2 It is the mounting structure schematic drawing of the locking mechanism of the utility model embodiment;

[0041] Figure 3 is the installation state of the locking mechanism of the embodiment of the utility model, and it is a disassembled schematic view;

[0042] Figure 4 is the cooperation schematic view of the shell after forming and the movable insert;

[0043] Figure 5 is the state schematic view of the shell and the movable insert after separation.

[0044] Reference signs:

[0045] Shell 100, movable insert 101;

[0046] Rack 200, workbench 201, guide seat 202, guide rod 203, trigger part 204, mounting column 205, first section 206, second section 207, third limiting nut 208;

[0047] Unloading part 300, connecting plate 310, stop block 311, movable frame 320, movable plate 321, first mounting rod 322, first limiting nut 323, hammer head 330, elastic member 340;

[0048] Locking mechanism 400, mounting part 410, pressing part 420, pressing plate 421, second mounting rod 422, second limiting nut 423, pressing screw 430;

[0049] Driving part 500;

[0050] Travel switch 600. DETAILED DESCRIPTION

[0051] The embodiments of the utility model are described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as the limitation of the utility model.

[0052] In the description of the utility model, it is understood that the orientation description, such as the orientation or position relationship of indication, for example, up and down, is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and is not indicative or implied that the indicated device or element must have a specific orientation, a specific orientation and operation, therefore, it cannot be understood as the limitation of the utility model.

[0053] In the description of the utility model, more refers to two or more. If there is a description of first, second, it is only used for distinguishing technical features for the purpose, and can not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0054] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection should be broadly understood, and the person skilled in the art can determine the specific meaning of the above words in the utility model in combination with the specific content of the technical scheme.

[0055] In the production process of the automobile gearbox shell 100, the shape of some parts needs to be formed by using movable inserts 101 in the process of forming the shell 100, and after forming, the movable inserts 101 are buckled together with the shell 100 (as shown in the figure), and the original production operation needs to use a hammer to knock the movable inserts 101 out of the formed shell, which is troublesome and time-consuming and laborious. Figure 4

[0056] Therefore, the utility model provides a mold stripping tool, which can effectively improve the above problems.

[0057] The mold stripping tool of the utility model embodiment will be described below with reference to Figures 1 to 3 For the convenience of understanding, Figure 4 The cooperation schematic view of the shell 100 after forming and the movable inserts 101 is shown, and at this time, the movable inserts 101 are buckled together with the shell 100, Figure 5 The state schematic view of the shell 100 and the movable inserts 101 after separation is shown.

[0058] The mold stripping tool of one embodiment of the utility model is used to take out the movable inserts 101 on the shell 100, and comprises a rack 200, a mold stripping part 300, a locking mechanism 400 and a driving part 500.

[0059] The rack 200 is provided with a workbench 201, and the workbench 201 is used to support the shell 100.

[0060] The mold stripping part 300 is arranged on the rack 200 in a lifting manner, the mold stripping part 300 is located above the workbench 201, and the mold stripping part 300 is used to press out the movable inserts 101 on the shell 100 downward, so that the movable inserts 101 are separated from the shell 100.

[0061] The locking mechanism 400 is arranged on the workbench 201, and the locking mechanism 400 is staggered with the mold stripping part 300 in the horizontal direction, and the locking mechanism 400 is used to apply a downward force to the shell 100, so as to press the shell 100 tightly on the workbench 201, thereby preventing the shell 100 from shaking when the mold stripping part 300 presses the movable inserts 101. ​

[0062] The driving part 500 is arranged on the rack 200, and is in transmission connection with the mold stripping part 300, and is used for driving the mold stripping part 300 to ascend and descend.

[0063] In use, the shell 100 is arranged on the workbench 201 (at this time, the movable insert 101 is buckled with the shell 100), the movable insert 101 is arranged below the mold stripping part 300, then the shell 100 is pressed on the workbench 201 by the locking mechanism 400, the shell 100 is prevented from shaking, then the mold stripping part 300 is driven to descend by the driving part 500, the movable insert 101 on the shell 100 is pressed out, the movable insert 101 is separated from the shell 100, finally the mold stripping part 300 is driven to ascend by the driving part 500, and the mold stripping part 300 is reset, then the locking of the shell 100 by the locking mechanism 400 is released, and the shell 100 can be taken out.

[0064] The mold stripping tool of the embodiment of the utility model, through setting the liftable mold stripping part 300 and the driving part 500 for driving the mold stripping part 300 to ascend and descend, the movable insert 101 on the shell 100 can be pressed out by driving the mold stripping part 300 to move by the driving part 500, so that the operation is convenient, time and labor are saved, in addition, through setting the locking mechanism 400 staggered with the mold stripping part 300 along the horizontal direction, the shell 100 is pressed on the workbench 201 by the locking mechanism 400, so that when the movable insert 101 is pressed by the mold stripping part 300, the end of the shell 100 far from the movable insert 101 can be prevented from being raised, so that the mold stripping part 300 can smoothly press the movable insert 101 out of the shell 100.

[0065] It is conceived that the driving part 500 can adopt an oil cylinder or an air cylinder, or other power components meeting the conditions.

[0066] Referring to Figure 1 As shown in the utility model, in some embodiments of the utility model, the mold stripping part 300 comprises a connecting plate 310, a movable frame 320, a hammer head 330 and an elastic piece 340.

[0067] The connecting plate 310 is connected to the output end of the driving part 500, and the connecting plate 310 can ascend and descend under the drive of the driving part 500; the movable frame 320 is vertically slidably installed on the connecting plate 310, that is, the movable frame 320 can ascend and descend together with the connecting plate 310, and the movable frame 320 can vertically move relative to the connecting plate 310; the hammer head 330 is fixedly connected to the lower end of the movable frame 320, and the hammer head 330 is used for directly contacting the movable insert 101 to press the movable insert 101 out of the shell 100; the elastic piece 340 is connected between the connecting plate 310 and the movable frame 320, and the elastic piece 340 is used for applying an elastic force downward to the movable frame 320.

[0068] Based on the above setting, when the movable insert 101 is pressed down, the driving part 500 drives the connecting plate 310 to descend, the movable frame 320 descends along with the connecting plate 310, when the hammer head 330 on the movable frame 320 contacts the movable insert 101, the connecting plate 310 continues to descend, the movable frame 320 and the connecting plate 310 produce relative displacement in the vertical direction, at this time, the elastic member 340 produces elastic deformation, plays the role of elastic buffering, prevents the hammer head 330 and the movable insert 101 from producing excessive rigid impact, avoids that the hammer head 330 presses and damages the movable insert 101.

[0069] With reference to Figure 1 As shown in the utility model, in some embodiments of the utility model, the movable frame 320 comprises a movable plate 321, a first mounting rod 322 and a first limiting nut 323.

[0070] The movable plate 321 is located on the lower side of the connecting plate 310; the first mounting rod 322 is provided with a plurality of first mounting rods 322 and is arranged on the upper surface of the movable plate 321, the plurality of first mounting rods 322 are vertically slidably arranged on the connecting plate 310, and the connecting plate 310 is provided with a hole position corresponding to the first mounting rod 322; the first limiting nut 323 is in one-to-one correspondence with the first mounting rod 322, the first limiting nut 323 is threadedly connected to the first mounting rod 322, and the first limiting nut 323 is located on the upper side of the connecting plate 310, so that the movable frame 320 is slidably arranged on the connecting plate 310, and the structure is simple and convenient to install; in addition, the elastic member 340 is a compression spring, and is in one-to-one correspondence with the first mounting rod 322, the compression spring is sleeved on the corresponding first mounting rod 322, and the two ends of the compression spring abut against the connecting plate 310 and the movable plate 321 respectively, so that the downward elastic force is applied to the movable frame 320, and the structure is simple and practical.

[0071] It is conceivable that, in order to make the movable plate 321 bear force uniformly, the plurality of first mounting rods 322 can be uniformly distributed around the center line of the hammer head 330.

[0072] With reference to Figure 1 As shown in the utility model, in some embodiments of the utility model, a stop block 311 is arranged between the movable plate 321 and the connecting plate 310, the stop block 311 is used for limiting the movement stroke of the movable plate 321 when the movable plate 321 approaches the connecting plate 310, that is, the compression amount of the compression spring can be limited, excessive compression of the compression spring is avoided, and the service life of the compression spring is improved. Obviously, the stop block 311 can be fixed on the lower surface of the connecting plate 310, for example Figure 1 As shown in the utility model; the stop block 311 can also be fixed on the upper surface of the movable plate 321 (not shown in the figure).

[0073] With reference to Figure 1As shown in some embodiments of the utility model, the mold stripping tool further comprises a guide structure, the guide structure comprises a guide seat 202 and a guide rod 203, the guide seat 202 is connected to the rack 200, and a vertically extending guide hole is arranged on the guide seat 202, the guide rod 203 vertically extends and is in sliding fit with the guide hole, and the guide rod 203 is connected to the mold stripping part 300; by arranging the guide rod 203 and the guide seat 202, the lifting of the mold stripping part 300 can be guided, the lifting of the mold stripping part 300 is more smooth and is not easy to deviate, and the stable operation of the mold stripping operation is ensured.

[0074] It is conceived that, in order to improve stability, two guide seats 202 can be vertically and spacedly arranged, and the guide rod 203 is in vertical sliding fit with the two guide seats 202 respectively.

[0075] In addition, in some specific embodiments, the bottom end of the guide rod 203 is fixedly connected with the connecting plate 310 in the mold stripping part 300.

[0076] Referring to Figure 1 As shown in some embodiments of the utility model, a trigger part 204 is arranged on the guide rod 203, and the mold stripping tool further comprises two travel switches 600; the two travel switches 600 are vertically and spacedly arranged on the rack 200, and the two travel switches 600 are electrically connected with the driving part 500, and the trigger part 204 is located between the two travel switches 600; during the lifting of the mold stripping part 300, the trigger part 204 can trigger the two travel switches 600 respectively, so as to control the lifting stroke of the mold stripping part 300; the upper travel switch 600 is used for controlling the limit stroke of the lifting of the mold stripping part 300, and the lower travel switch 600 is used for controlling the limit stroke of the lowering of the mold stripping part 300, so that the mold stripping part 300 can be lifted and lowered accurately.

[0077] It is conceived that the travel switch 600 can be a travel switch 600 in the form of direct action, roller, photoelectricity, magnetic induction and the like.

[0078] In addition, the trigger part 204 can be one, and the one trigger part 204 is used for cooperating with the two travel switches 600 respectively; the trigger part 204 can also be two vertically and spacedly arranged, and the two trigger parts 204 are used for cooperating with the two travel switches 600 respectively (for example Figure 1 As shown).

[0079] Referring to Figures 1 to 3 As shown in some embodiments of the utility model, the locking mechanism 400 comprises: a mounting part 410, a pressing part 420 and a pressing screw 430.

[0080] The mounting portion 410 is connected to the upper side of the workbench 201; the pressing portion 420 is vertically slidably mounted on the mounting portion 410, and the pressing portion 420 is used for abutting against the shell 100 downward; the pressing screw 430 is threadedly mounted on the mounting portion 410, and the pressing screw 430 is vertically distributed, and the pressing screw 430 is used for abutting against the pressing portion 420 downward to press the pressing portion 420 against the shell 100; in use, the pressing portion 420 can be pressed against the shell 100 by rotating the pressing screw 430, so as to lock and fix the shell 100; when the shell 100 needs to be taken out, the pressing screw 430 is reversely rotated, and the operation is very convenient.

[0081] It is conceived that, in order to facilitate the rotation of the pressing screw 430, a handle is arranged at the top of the pressing screw 430.

[0082] Referring to Figure 2 and Figure 3 It is shown that, in some embodiments of the utility model, the pressing portion 420 comprises a pressing plate 421, a second mounting rod 422 and a second limiting nut 423.

[0083] The pressing plate 421 is used for contacting the shell 100; the second mounting rod 422 is provided with a plurality of second mounting rods 422 and is arranged on the upper surface of the pressing plate 421, and the second mounting rod 422 is vertically slidably arranged in the mounting portion 410; the second limiting nut 423 corresponds to the second mounting rod 422 one by one, and the second limiting nut 423 is threadedly connected to the second mounting rod 422, and the second limiting nut 423 is located on the upper side of the mounting portion 410, so that the pressing portion 420 is slidably mounted on the mounting portion 410, and the structure is simple and convenient to disassemble and assemble. In addition, it can be understood that, by arranging the pressing plate 421 to contact the shell 100, the contact area with the shell 100 can be ensured, and the structural stability is improved.

[0084] It is conceived that the mounting portion 410 can also be provided as a plate structure.

[0085] Referring to Figure 2 and Figure 3 It is shown that, in some embodiments of the utility model, the workbench 201 is provided with a vertically extending mounting column 205, and the mounting portion 410 is connected to the mounting column 205 and can be rotationally adjusted around the central axis of the mounting column 205, so that, when the shell 100 needs to be taken out or placed, the mounting portion 410 can be rotationally adjusted to the corresponding position, so as to avoid interference with the taking out or placing of the shell 100, and the operator can operate conveniently.

[0086] Based on the above setting, in some specific embodiments, the mounting column 205 comprises a first segment 206 and a second segment 207 arranged in sequence from bottom to top, the diameter of the first segment 206 is larger than that of the second segment 207, a stepped surface is formed between the first segment 206 and the second segment 207, the second segment 207 is provided with external threads and is threadedly connected with a third limiting nut 208, the mounting portion 410 is provided with a circular sleeve hole and is sleeved on the second segment 207 through the sleeve hole, the mounting portion 410 is located between the stepped surface and the third limiting nut 208, so as to realize the connection of the mounting portion 410 and the mounting column 205 and enable the mounting portion 410 to rotate and adjust around the central axis of the mounting column 205, and the structure is simple and practical.

[0087] It can be understood that, in order to improve the stability when the pressing portion 420 presses the shell 100, the third limiting nut 208 can be tightened when the pressing portion 420 presses the shell 100, so as to lock the mounting portion 410 on the mounting column 205, and when it is necessary to rotate and adjust the mounting portion 410, the third limiting nut 208 can be slightly loosened.

[0088] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present specification.

[0089] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge range of those skilled in the art without departing from the purpose of the present application.

Claims

1. A demolding tool for removing a movable insert from a housing, characterized in that, include: A frame, wherein the frame is provided with a worktable, the worktable being used to support the housing; The demolding section is vertically and flexibly mounted on the frame and located above the worktable. The demolding section is used to press the movable insert on the housing downwards. A locking mechanism is provided on the worktable and is offset from the demolding part in the horizontal direction. The locking mechanism is used to apply a downward force to the housing to press the housing tightly against the worktable. A drive unit is disposed on the frame and is connected to the unloading unit for driving the unloading unit to rise and fall.

2. The demolding fixture according to claim 1, characterized in that: The demolding section includes: A connecting plate, which is connected to the output end of the drive unit; A movable frame, which is vertically slidably mounted on the connecting plate; A hammerhead, which is connected to the lower end of the movable frame and is used to contact the movable insert; An elastic element is connected between the connecting plate and the movable frame, and is used to apply a downward elastic force to the movable frame.

3. The demolding fixture according to claim 2, characterized in that: The movable frame includes: A movable plate, located below the connecting plate; Multiple first mounting rods are spaced apart on the upper surface of the movable plate and slide vertically through the connecting plate; The first limiting nut corresponds one-to-one with the first mounting rod. The first limiting nut is threadedly connected to the first mounting rod and is located on the upper side of the connecting plate. The elastic element is configured as a compression spring and is sleeved on the first mounting rod.

4. The demolding fixture according to claim 3, characterized in that: A stop block is provided between the movable plate and the connecting plate to limit the travel distance of the movable plate when it moves close to the connecting plate.

5. The demolding fixture according to claim 1, characterized in that: The demolding fixture also includes: The guide structure includes a guide seat and a guide rod. The guide seat is connected to the frame and has a vertically extending guide hole. The guide rod extends vertically and slides in cooperation with the guide hole. The guide rod is connected to the demolding part.

6. The demolding fixture according to claim 5, characterized in that: The guide rod is provided with a triggering part, and the mold removal tooling further includes: Two limit switches are vertically spaced apart on the frame and electrically connected to the drive unit; The triggering part is located between the two limit switches. During the lifting and lowering process of the unmolding part, the triggering part can trigger the two limit switches respectively to control the lifting and lowering stroke of the unmolding part.

7. The demolding fixture according to claim 1, characterized in that: The locking mechanism includes: Mounting part, the mounting part is connected to the upper side of the workbench; A clamping part is vertically slidably mounted on the mounting part and used to abut against the housing downwards; A clamping screw is threaded onto the mounting part and vertically distributed. The clamping screw is used to abut against the clamping part downwards to press the clamping part against the housing.

8. The demolding fixture according to claim 7, characterized in that: The clamping part includes: A pressure plate, the pressure plate being used to contact the housing; Multiple second mounting rods are spaced apart on the upper surface of the pressure plate and slide vertically through the mounting portion; The second limiting nut corresponds one-to-one with the second mounting rod. The second limiting nut is threadedly connected to the second mounting rod and is located on the upper side of the mounting part.

9. The demolding fixture according to claim 7, characterized in that: The workbench is provided with a vertically extending mounting column, and the mounting part is connected to the mounting column and can rotate and adjust around the central axis of the mounting column.

10. The demolding fixture according to claim 9, characterized in that: The mounting post includes a first section and a second section arranged sequentially from bottom to top. The diameter of the first section is larger than that of the second section and a stepped surface is formed. The second section is threadedly connected to a third limiting nut. The mounting part is provided with a circular sleeve hole and is fitted onto the second section through the sleeve hole. The mounting part is located between the stepped surface and the third limiting nut.

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