Workpiece adjusting assembly of multi-station rotary friction welding machine

Abstract

The application relates to the technical field of rotary friction welding machines, in particular to a workpiece adjusting assembly of a multi-station rotary friction welding machine, which comprises an equipment platform composed of a machine base, a multi-station rotary table and a main shaft rotary clamping mechanism; the top of the machine base is fixedly connected with a ring-shaped plate; the multi-station rotary table is movably connected to the top of the machine base through a bearing; and the main shaft rotary clamping mechanism is fixedly installed at the bottom of a lateral support frame of the machine base. The application realizes high-precision positioning of workpieces through a bidirectional composite abutting and a multidirectional ring-encircling abutting structure; the abutting and clamping plate applies bidirectional abutting force to the workpieces in the horizontal and vertical directions, eliminates welding displacement and movement, and forms multidirectional ring-encircling through synchronous deflection of the abutting plates, thereby ensuring accurate center positioning of the workpieces, and the two types of mechanisms jointly ensure coaxiality and stable adhesion of the workpiece axis during welding, and significantly improve joint strength and quality consistency.

Description

Technical Field

[0001] This invention relates to the field of rotary friction welding machine technology, specifically a workpiece adjustment assembly for a multi-station rotary friction welding machine. Background Technology

[0002] Friction welding is mainly used for rotating workpieces, such as shafts and pipes. It can also weld parts of the same or different metals with good thermoplasticity. The working principle is to rotate the rotating end workpiece at high speed, bring it into contact with the fixed end workpiece and apply friction pressure. Heat is generated by surface friction to bring the material to a plastic state. Then, the two workpieces are solid-phase connected by upsetting pressure, and the welding is finally completed.

[0003] In the existing technology, when the workpiece adjustment assembly is fixing the workpiece, it can usually only limit the workpiece by the horizontal clamping mechanism. It lacks effective constraints on the vertical movement of the workpiece, which makes it easy for the workpiece to move up and down due to the upsetting pressure during the welding process, making it difficult to maintain a stable fitting posture and coaxiality of the axis.

[0004] Meanwhile, the positioning accuracy of the workpiece relies on manual calibration or clamping in one direction, which cannot achieve multi-directional synchronous adaptive adjustment. This can easily lead to problems such as welding misalignment and incomplete welding, resulting in insufficient weld joint strength and a high scrap rate, making it difficult to meet the needs of efficient continuous production. Summary of the Invention

[0005] The purpose of this invention is to provide a workpiece adjustment assembly for a multi-station rotary friction welding machine, which solves the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a workpiece adjustment assembly for a multi-station rotary friction welding machine, comprising an equipment platform, the equipment platform being composed of a base, a multi-station rotary table, and a spindle rotation clamping mechanism, wherein an annular plate is fixedly connected to the top of the base, the multi-station rotary table is movably connected to the top of the base via bearings, and the spindle rotation clamping mechanism is fixedly installed at the bottom of a side support frame of the base;

[0007] The top of the multi-station rotary table is fixedly connected to multiple sets of receiving sleeves in a circular array around its own center. The bottom end of the spindle rotation clamping mechanism is connected to receiving sleeves. The top of the multi-station rotary table and on both sides of the receiving sleeves are provided with positioning components for adjusting the position of the workpiece.

[0008] Furthermore, the positioning component includes a clamping plate, and a frame is fixedly connected to the top of the multi-station rotary table and to both sides of the receiving sleeve. A linear track is fixedly connected to the inner side wall of the frame, and a sliding seat is slidably connected between two corresponding linear tracks. A movable groove is opened through the top of the sliding seat, and a driving block is fixedly connected to the inner wall of the movable groove of the sliding seat.

[0009] Furthermore, a supporting horizontal plate is fixedly connected to the inner side wall of the frame, and a rotating block is rotatably connected to the side wall of the supporting horizontal plate. A swing frame one and a swing frame two are fixedly connected to the top and bottom of the rotating block, respectively. The driving block is located inside the swing frame two, and an inclined track is fixedly connected to the top of the supporting horizontal plate.

[0010] A connecting rod is slidably connected inside the inclined track. One end of the connecting rod is fixedly connected to the outer wall of the clamping plate, and the other end of the connecting rod is fixedly connected to a connecting frame. The connecting frame cooperates with the swing frame.

[0011] Furthermore, a sliding rod is symmetrically fixedly connected to the outer side of the clamping plate, and a sliding block is fixedly connected to the outer side of the sliding rod. An inclined sliding groove is provided on the inner side wall of the frame for guiding the sliding block to slide.

[0012] Furthermore, the top of the annular plate is provided with double guide grooves located at the same center, and the bottom end of the sliding seat is fixedly connected with a guide block that slides in the double guide grooves.

[0013] Furthermore, the bottom of the multi-station rotary table is fixedly equipped with multiple sets of plug-in sleeves in a ring array, and the top of the ring plate is fixedly equipped with two miniature electric push rods, the top of which is fixedly connected to a plug-in block that cooperates with the plug-in sleeve.

[0014] Furthermore, the side wall of the support frame is fixedly connected to a first track frame and a second track frame. The inside of the first track frame is movably connected to a threaded rod via a bearing. The inner side wall of the second track frame is fixedly connected to a track crossbar. A sliding frame is provided on one side of the support frame, and a bearing cylinder is fixedly connected to the end of the sliding frame.

[0015] Furthermore, a support plate is provided above the top of the bearing cylinder, and a material-carrying plate is fixedly connected to the top of the support plate via a bracket. A drive plate is provided between the material-carrying plate and the support plate. A lifting cylinder is fixedly installed inside the bearing cylinder, and the top of the lifting cylinder is fixedly connected to the bottom of the support plate.

[0016] Furthermore, the side wall of the drive plate is rotatably connected with a linkage rod one at equal intervals, the top center of the pallet is fixedly connected with a lifting push cylinder two, and the top end of the lifting push cylinder two is fixedly connected with the bottom of the drive plate, the top of the pallet is rotatably connected with a linkage rod two, one end of the linkage rod two is rotatably connected with the linkage rod one, and the outer side of the linkage rod one is fixedly connected with a stop plate.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. Regarding the adaptive adjustment of workpieces, for workpiece one, during the rotation of the multi-station rotary table, the guide block slides along the double guide groove to drive the sliding seat to move horizontally. Through the linkage of the drive block, swing frames one and two, and connecting rods, the clamping plate applies a combined horizontal and vertical clamping force to workpiece one. This not only corrects the lateral position of workpiece one, but also eliminates the risk of its vertical movement through vertical pressure, ensuring that workpiece one is stably attached to receiving sleeve one. For workpiece two, the lifting push cylinder two drives the drive plate to descend. Through the combined action of the linkage rotating rods one and two, the abutment plate deflects synchronously and adjusts the position of workpiece two in real time until its center is precisely aligned with the center of the loading plate, and then multi-directional clamping is implemented to achieve high-precision positioning of workpiece two, ensuring the coaxiality and fitting accuracy of the two workpieces during welding from the source.

[0019] 2. In terms of continuous feeding and automated operation, the multi-station rotary table and multiple mechanisms work together to achieve seamless connection of the entire process. When the motor drives the multi-station rotary table to rotate in a circle, the segmented trajectory of the double guide groove automatically triggers the clamping and release of the clamping plate.

[0020] When workpiece 1 enters the welding station with the rotary table, the guide block slides into the third section of the double guide groove. The clamping plate simultaneously completes the adaptive positioning and clamping of workpiece 1. The multi-station rotary table is further stabilized with the cooperation of the plug-in block, plug-in sleeve, and micro electric push rod, avoiding the problem of welding deviation caused by the shaking of the multi-station rotary table during the friction welding of workpiece 1 and workpiece 2. After welding is completed, the rotary table continues to rotate, the guide block returns to the first section of the groove, and the clamping plate automatically releases its clamp, realizing the continuous feeding of workpiece 1. Workpiece 2 is driven by motor 2 to move horizontally to the designated station. The lifting push cylinder 1 pushes the pallet to accurately send workpiece 2 into the receiving sleeve 2. The whole process does not require manual intervention, forming an automated cycle of feeding, positioning, welding, and unloading, which significantly improves welding efficiency and production continuity, while reducing manual operation errors and labor intensity. Attached Figure Description

[0021] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings;

[0022] Figure 1 This is a perspective view of the overall structure of the present invention;

[0023] Figure 2 This is a perspective view of the material-carrying plate structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the clamping plate structure in this invention;

[0025] Figure 4 This is a schematic diagram of the connecting frame structure in the present invention;

[0026] Figure 5This is a schematic diagram of the inclined slide groove structure in this invention;

[0027] Figure 6 This is a schematic diagram of the driving block structure in this invention;

[0028] Figure 7 This is a bottom view of the multi-station rotary table structure in this invention;

[0029] Figure 8 This is a schematic diagram of the track frame structure in this invention;

[0030] Figure 9 This is a schematic diagram of the pallet structure in this invention;

[0031] Figure 10 This is a schematic diagram of the guide double groove structure in this invention.

[0032] Reference numerals in the attached drawings: 101, machine base; 102, multi-station rotary table; 103, spindle rotation clamping mechanism; 2, annular plate; 301, receiving sleeve one; 302, receiving sleeve two; 401, clamping plate; 402, linear track; 403, sliding seat; 404, drive block; 405, swing frame one; 406, swing frame two; 407, inclined track; 408, connecting rod; 409, connecting frame; 5, frame; 6, slide rod; 7, inclined slide groove; 8, double guide groove; 9, guide block; 10, track frame one; 11, track frame two; 12, bearing cylinder; 13, material loading plate; 14, drive plate; 15, lifting push cylinder two; 16, linkage rotating rod one; 17, linkage rotating rod two; 18, support plate; 19, abutment plate; 20, plug-in sleeve; 21, miniature electric push rod; 22, plug-in block. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1: As Figures 1-10 As shown, a workpiece adjustment assembly for a multi-station rotary friction welding machine includes an equipment platform. The equipment platform consists of a base 101, a multi-station rotary table 102, and a spindle rotation clamping mechanism 103. An annular plate 2 is fixedly connected to the top of the base 101. The multi-station rotary table 102 is movably connected to the top of the base 101 via bearings, and the multi-station rotary table 102 is rotated by a motor installed inside the base 101.

[0035] The spindle rotation clamping mechanism 103 is fixedly installed at the bottom of the support frame next to the machine base 101. The top of the multi-station rotary table 102 is fixedly connected with multiple sets of receiving sleeves 301 in a circular array around its own center. The bottom end of the spindle rotation clamping mechanism 103 is connected to receiving sleeve 302. The top of the multi-station rotary table 102 and on both sides of the receiving sleeve 301 are provided with adjustment components for adjusting the position of the workpiece.

[0036] The two objects used in this invention are respectively set as workpiece one and workpiece two, and the cross-sections of workpiece one and workpiece two are both cylindrical. The working principle is to rotate the rotating end workpiece two at high speed, contact it with the fixed end workpiece one and apply friction pressure, use the surface friction to generate heat to make the material reach a plastic state, and then use upsetting pressure to make the two workpieces achieve solid-phase connection, and finally complete the welding.

[0037] Therefore, the receiving sleeve 301 in this invention is used to assemble workpiece 1, and the receiving sleeve 302 is used to assemble workpiece 2. The receiving sleeve 302 is equipped with a suction cup inside to adsorb and fix workpiece 2. The spindle rotation clamping mechanism 103 is an existing device. Its function is to drive workpiece 2 to descend synchronously until it contacts the top of workpiece 1 and then rotates at high speed to finally complete the welding.

[0038] The positioning assembly includes a clamping plate 401. The inner sidewall of the clamping plate 401 may be provided with an anti-slip pad to further improve the clamping stability of the workpiece. The top of the multi-station rotary table 102 and both sides of the receiving sleeve 301 are fixedly connected to a frame 5. The inner sidewall of the frame 5 is fixedly connected to a linear track 402. A sliding seat 403 is slidably connected between two corresponding linear tracks 402. The top of the sliding seat 403 is provided with a through slot. A drive block 404 is fixedly connected to the inner wall of the slot of the sliding seat 403.

[0039] A support plate is fixedly connected to the inner side wall of frame 5, and a rotating block is rotatably connected to the side wall of the support plate. A swing frame 1 405 and a swing frame 2 406 are fixedly connected to the top and bottom of the swing block, respectively. The drive block 404 is located inside the swing frame 2 406. An inclined track 407 is fixedly connected to the top of the support plate.

[0040] A connecting rod 408 is slidably connected inside the inclined track 407. One end of the connecting rod 408 is fixedly connected to the outer wall of the clamping plate 401, and the other end of the connecting rod 408 is fixedly connected to a connecting frame 409. The connecting frame 409 cooperates with the swing frame 405. A sliding rod 6 is symmetrically fixedly connected to the outer side of the clamping plate 401. A sliding block is fixedly connected to the outer side of the sliding rod 6. An inclined sliding groove 7 is provided on the inner side wall of the frame 5 for guiding the sliding block to slide.

[0041] During its movement, the abutment plate 401 moves obliquely within the inclined track 407 via the connecting rod 408. Furthermore, during this movement, the abutment plate 401, through the cooperation of the sliding rod 6 fixedly connected to its outer side and the sliding block, achieves greater stability along the inclined slide groove 7.

[0042] The top of the annular plate 2 has a double guide groove 8 located at the same center, and the bottom end of the sliding seat 403 is fixedly connected to a guide block 9 that slides in the double guide groove 8. Figure 10 As shown, the top of the annular plate 2 has two closed grooves, which together form the guide double groove 8;

[0043] The bottom of the multi-station rotary table 102 is fixedly installed with multiple sets of plug-in sleeves 20 in a ring array. The top of the ring plate 2 is fixedly installed with two miniature electric push rods 21. The top of the miniature electric push rods 21 is fixedly connected with plug-in blocks 22 that cooperate with the plug-in sleeves 20. It should be noted that the two miniature electric push rods 21 are located directly below the bottom receiving sleeve 302 of the spindle rotation clamping mechanism 103.

[0044] The two closed slots are divided into three sections. The first section accounts for most of the overall stroke, and the spacing between the first section remains unchanged. The second and third sections account for less than half of the overall stroke. The third section is located directly below the spindle rotation clamping mechanism 103. The spacing between the third section remains unchanged, and the spacing between the two third sections is greater than the spacing between the two first sections. The two ends of the second section are used to connect the corresponding first and second sections. When the guide blocks 9 located on both sides of the bottom of the same receiving sleeve 301 slide along the double guide groove 8;

[0045] When the two guide blocks 9 slide from the first groove into the second groove, the distance between the two guide blocks 9 increases. When they move from the second groove to the third groove, the distance between the guide blocks 9 increases to a certain distance and then the distance between the two guide blocks 9 remains fixed. At this time, the clamping plate 401 presses against one outer wall of the workpiece.

[0046] Example 2: The side wall of the support frame is fixedly connected to a first track frame 10 and a second track frame 11. The inside of the first track frame 10 is movably connected to a threaded rod through a bearing. The outer end of the first track frame 10 is fixedly installed with a second motor for driving the threaded rod to rotate. The inner side wall of the second track frame 11 is fixedly connected to a track crossbar. A sliding frame is provided on one side of the support frame. The end of the sliding frame is fixedly connected to a bearing cylinder 12. The sliding frame moves horizontally along the first track frame 10 under the action of the threaded rod, and the sliding frame moves more stably horizontally under the action of the track crossbar.

[0047] A support plate 18 is provided above the top of the bearing cylinder 12, and a material loading plate 13 is fixedly connected to the top of the support plate 18 via a bracket. A drive plate 14 is provided between the material loading plate 13 and the support plate 18. A lifting push cylinder is fixedly installed inside the bearing cylinder 12, and the top of the lifting push cylinder is fixedly connected to the bottom of the support plate 18.

[0048] The side wall of the drive plate 14 is rotatably connected with a first linkage rod 16 at equal intervals. The top center of the support plate 18 is fixedly connected with a second lifting cylinder 15, and the top of the second lifting cylinder 15 is fixedly connected to the bottom of the drive plate 14. The top of the support plate 18 is rotatably connected with a second linkage rod 17, one end of the second linkage rod 17 is rotatably connected to the first linkage rod 16, and the outer side of the first linkage rod 16 is fixedly connected with a stop plate 19.

[0049] As can be seen from Embodiment 1 and Embodiment 2, the working principle of the present invention is as follows:

[0050] As the motor drives the multi-station rotary table 102 to rotate in a circular motion, multiple workpieces are placed sequentially inside the corresponding receiving sleeves 301. During the rotation of the multi-station rotary table 102, the guide blocks 9 slide in the double guide grooves 8. When the two guide blocks 9 slide from the first groove to the second groove, the distance between the two guide blocks 9 increases. When they move from the second groove to the third groove, the distance between the guide blocks 9 increases to a certain distance, and then the distance between the two guide blocks 9 remains fixed. Specifically, the two guide blocks 9 move away from each other. During the movement of the two guide blocks 9, the sliding seat 403 moves horizontally in the linear track 402.

[0051] Regarding the placement and fixing of workpiece 1: When the two sliding seats 403 move away from each other within their respective straight tracks 402, the driving block 404 and the second swing frame 406 further drive the first swing frame 405 to deflect. During the deflection process, the first swing frame 405, through its cooperation with the connecting frame 409, drives the connecting rod 408 to move obliquely downward along the inclined track 407 until the clamping plate 401 clamps and fixes the outer wall of workpiece 1, and the inclined track 407 is tilted. Thus, under the action of the connecting rod 408 and the inclined track 407, the clamping plate 401 not only clamps the workpiece 1 horizontally, but also clamps it vertically downward, so that the placement position of workpiece 1 is adjusted, and it can be placed more stably in the receiving sleeve 301.

[0052] When workpiece 1 is clamped by the clamping plate 401, the two corresponding plug sleeves 20 are located directly above the plug block 22. Then, the micro electric push rod 21 pushes the plug block 22 upward until the plug block 22 enters the plug sleeve 20. At this time, the multi-station rotary table 102 is further stabilized by the cooperation of the plug block 22, the plug sleeve 20 and the micro electric push rod 21, so as to avoid the problem of welding deviation caused by the shaking of the multi-station rotary table 102 during the friction welding of workpiece 1 and workpiece 2.

[0053] For the placement and fixing of workpiece 2: place workpiece 2 on top of the loading plate 13. Lifting cylinder 2 15 drives the drive plate 14 to descend. During the descent, the drive plate 14, through the cooperation of linkage rod 1 16 and linkage rod 2 17, further drives the abutment plate 19 to deflect synchronously and gradually approach workpiece 2. During the synchronous deflection of multiple abutment plates 19, the position of workpiece 2 on the top of the loading plate 13 is adjusted in real time until the center of workpiece 2 coincides with the center of the loading plate 13. Then, multiple abutment plates 19 simultaneously press workpiece 2 in multiple directions.

[0054] Motor 2 drives the threaded rod to rotate, and further drives the sliding frame to move horizontally along the length of track frame 10 until workpiece 2 moves to a position directly below the spindle rotation clamping mechanism 103. At any time, the lifting cylinder 1 drives the support plate 18 and workpiece 2 to rise synchronously until workpiece 2 is placed in receiving sleeve 2 302. Receiving sleeve 2 302 uses an internal adsorption plate to adsorb and fix workpiece 2. Since the position of workpiece 2 is pre-adjusted by multiple abutment plates 19, workpiece 2 can be placed more accurately in receiving sleeve 2 302. The abutment plates 19 release the clamping of workpiece 2 and move to the initial position. Then, the spindle rotation clamping mechanism 103 drives workpiece 2 to descend and performs friction welding on workpiece 1 and workpiece 2.

[0055] After welding is completed, the multi-station rotary table 102 continues to rotate until the guide block 9 moves back into the first groove. At this time, the clamping plate 401 releases the clamping of the welded workpiece. The above steps are repeated to achieve continuous feeding, adaptive positioning and clamping of workpiece one and workpiece two.

[0056] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A workpiece adjustment assembly for a multi-station rotary friction welding machine, comprising an equipment platform, said equipment platform being composed of a base (101), a multi-station rotary table (102), and a spindle rotation clamping mechanism (103), characterized in that, The top of the machine base (101) is fixedly connected to an annular plate (2), the multi-station rotary table (102) is movably connected to the top of the machine base (101) through bearings, and the spindle rotation clamping mechanism (103) is fixedly installed at the bottom of the side support frame of the machine base (101). The top of the multi-station rotary table (102) is fixedly connected with multiple sets of receiving sleeves (301) in a ring array around its own center. The bottom end of the spindle rotation clamping mechanism (103) is connected with receiving sleeves (302). The top of the multi-station rotary table (102) and on both sides of receiving sleeves (301) are provided with adjustment components for adjusting the position of the workpiece. The adjustment assembly includes a clamping plate (401). The top of the multi-station rotary table (102) and both sides of the receiving sleeve (301) are fixedly connected to a frame (5). The inner sidewall of the frame (5) is fixedly connected to a linear track (402). A sliding seat (403) is slidably connected between two corresponding linear tracks (402). The top of the sliding seat (403) is provided with a through slot. The inner wall of the slot of the sliding seat (403) is fixedly connected to a driving block (404). The inner sidewall of the frame (5) is fixedly connected to a support plate, and the sidewall of the support plate is rotatably connected to a rotating block. The top and bottom ends of the rotating block are respectively fixedly connected to a swing frame one (405) and a swing frame two (406). The driving block (404) is located inside the swing frame two (406). The top end of the support plate is fixedly connected to an inclined track (407). A connecting rod (408) is slidably connected inside the inclined track (407). One end of the connecting rod (408) is fixedly connected to the outer wall of the clamping plate (401), and the other end of the connecting rod (408) is fixedly connected to a connecting frame (409). The connecting frame (409) cooperates with the swing frame (405). The support frame is fixedly connected to a first track frame (10) and a second track frame (11) on its side wall. The first track frame (10) is movably connected to a threaded rod through a bearing. The second track frame (11) is fixedly connected to a crossbar on its inner side wall. A sliding frame is provided on one side of the support frame. A bearing cylinder (12) is fixedly connected to the end of the sliding frame. A support plate (18) is provided above the top of the bearing cylinder (12), and a material loading plate (13) is fixedly connected to the top of the support plate (18) by a bracket. A drive plate (14) is provided between the material loading plate (13) and the support plate (18). A lifting cylinder is fixedly installed inside the bearing cylinder (12), and the top of the lifting cylinder is fixedly connected to the bottom of the support plate (18). The drive plate (14) is rotatably connected to the side wall of the drive plate (14) at equal intervals. The top center of the support plate (18) is fixedly connected to the lifting cylinder (15), and the top of the lifting cylinder (15) is fixedly connected to the bottom of the drive plate (14). The top of the support plate (18) is rotatably connected to the linkage rod (17), and one end of the linkage rod (17) is rotatably connected to the linkage rod (16). The outer side of the linkage rod (16) is fixedly connected to the stop plate (19).

2. The workpiece adjustment assembly of a multi-station rotary friction welding machine according to claim 1, characterized in that, The outer side of the clamping plate (401) is symmetrically fixedly connected with a sliding rod (6), and the outer side of the sliding rod (6) is fixedly connected with a sliding block. The inner side wall of the frame (5) is provided with an inclined sliding groove (7) for guiding the sliding block to slide.

3. The workpiece adjustment assembly of a multi-station rotary friction welding machine according to claim 1, characterized in that, The top of the annular plate (2) is provided with a double guide groove (8) located at the same center, and the bottom of the sliding seat (403) is fixedly connected with a guide block (9) that slides in the double guide groove (8).

4. The workpiece adjustment assembly of a multi-station rotary friction welding machine according to claim 1, characterized in that, The bottom of the multi-station rotary table (102) is fixedly installed with multiple sets of plug sleeves (20) in a ring array. The top of the ring plate (2) is fixedly installed with two miniature electric push rods (21). The top of the miniature electric push rods (21) is fixedly connected with plug blocks (22) that cooperate with the plug sleeves (20).

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