Trimming equipment for processing semiconductor sealing element

Abstract

The invention discloses trimming equipment for semiconductor sealing element processing, and relates to the technical field of sealing element trimming equipment.The trimming equipment comprises a machine table, a driving wheel is rotationally installed at the top of one end of the machine table, and a stretching mechanism matched with and supporting a sealing ring is arranged at the top of the other end of the machine table; a cutting mechanism for trimming the sealing ring is arranged on the side surface of the stretching mechanism; a sealing ring to be trimmed is matched and supported through the stretching mechanism, and meanwhile, the trimming work of the large sealing ring is completed by utilizing the rotation of the driving wheel to be matched with the operation of the cutting mechanism. According to the trimming equipment for semiconductor sealing element machining, manual trimming operation on sealing rings is replaced, meanwhile, the trimming equipment is suitable for machining of the sealing rings with different diameters, the trimming efficiency is greatly improved, and the effects of being high in convenience and high in working efficiency are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of sealing component trimming equipment, and in particular to a trimming equipment for processing semiconductor sealing components. Background Art

[0002] Semiconductor sealing rings are a type of sealing material used in the semiconductor packaging process. Their main purpose is to protect semiconductor chips from moisture, dust and other external environmental damage, and to improve the reliability and life of semiconductor devices. Semiconductor sealing rings are important components in the semiconductor device packaging process and are widely used in multiple key locations to ensure the stability of equipment operation and packaging quality.

[0003] Due to the different sizes of semiconductors, the sizes of the sealing rings that match them also need to change accordingly. The common sealing rings on the market are relatively small in size, and existing equipment can be used for automatic trimming. However, for some large semiconductor sealing rings, due to their large size, conventional equipment cannot perform trimming operations on them, and workers are required to perform trimming, which results in low work efficiency and high labor costs. Summary of the invention

[0004] The invention discloses a trimming device for processing semiconductor seals, aiming to solve the technical problem that some large semiconductor seals on the existing market cannot be trimmed by conventional equipment and workers are required to perform trimming, resulting in low work efficiency and high labor costs.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A trimming device for processing semiconductor seals, comprising a machine platform, a driving wheel is rotatably mounted on the top of one end of the machine platform, and a stretching mechanism adapted to and supporting a sealing ring is arranged on the top of the other end of the machine platform;

[0007] A cutting mechanism for trimming the sealing ring is provided on the side of the stretching mechanism;

[0008] The sealing ring to be trimmed is adapted and supported by the stretching mechanism, and the trimming of the large sealing ring is completed by utilizing the rotation of the driving wheel in coordination with the operation of the cutting mechanism.

[0009] By arranging a stretching mechanism on the top of the machine, the stretching mechanism is used to cooperate with the rotation of the driving wheel to fix the large sealing ring and drive the sealing ring to rotate. During the rotation, the cutting mechanisms additionally arranged on both sides of the stretching mechanism can cooperate with the rotating sealing ring to trim the edges and corners on both sides of the sealing ring, thereby replacing the manual trimming of the sealing ring, greatly improving the trimming work efficiency, and reducing the labor required for trimming the sealing ring.

[0010] In a preferred embodiment, the stretching mechanism includes a guide rail arranged at one end of the top of the machine platform, a slide is slidably installed inside the guide rail, an auxiliary wheel is rotatably installed at one end of the slide, two side wheels are installed on each side of the slide, and a positioning wheel is movably arranged in the middle of both sides of the slide, in an initial state, the distance from the positioning wheel to the slide is greater than the distance from the side wheel to the slide, and when the positioning wheel is under pressure, the distance from the positioning wheel to the slide is equal to the distance from the side wheel to the slide, an electric push rod is provided at one end of the guide rail, the electric push rod is installed on the top of the machine, and the output end of the electric push rod is connected to the slide, a clamping piece is provided at the bottom of each of the positioning wheels, and a clamping groove is provided on both sides of the guide rail, and the clamping piece is clamped in the inside of the clamping groove.

[0011] By providing a slide structure which is slidably installed on the top of the machine using a guide rail, the slide is pushed horizontally by an electric push rod, and while moving, the loose sealing ring placed on the top of the machine is squeezed and tightened by the positioning of the driving wheel and the auxiliary wheel. At the same time, the gradually tightened sealing ring can generate a horizontal driving force for the positioning wheels on both sides of the slide, so that the engaging piece at the bottom of the positioning wheel moves synchronously with the movement of the positioning wheel and engages with the inside of the engaging groove, thereby positioning the slide and ensuring that the sealing ring is in the best trimming shape. It rotates slowly along with the rotation of the driving wheel, replacing manual fixation of the sealing ring and improving the convenience of trimming the sealing ring.

[0012] In a preferred embodiment, the cutting mechanism includes vertical poles horizontally fixed on both sides of the slide, a rotating shaft is horizontally fixed at one end of the inner part of the vertical pole, an arc-shaped piece is provided at one end of the vertical pole, an arc-shaped groove is horizontally opened on the side of the arc-shaped piece, the rotating shaft horizontally passes through the arc-shaped groove to connect the arc-shaped piece and the vertical pole, a cutting ring is horizontally fixed on the side of the arc-shaped piece, and the blades of the two symmetrically distributed cutting rings face opposite directions, and are placed in one horizontal and one vertical direction.

[0013] Two cutting ring structures with blades facing opposite directions are arranged on the basis of the slide, and the two cutting rings are placed in a horizontal and a vertical direction, so that the driving wheel can drive the sealing ring to rotate, and the rotating sealing ring can be fully trimmed, thereby improving the convenience of traditional trimming operations. The cutting ring is connected by an arc-shaped piece with an arc-shaped groove and a vertical pole with a rotating shaft. The user can freely adjust the placement direction of the cutting ring by rotating the arc-shaped piece. At the same time, the mutual extrusion of the rotating shaft and the arc-shaped groove is utilized to improve the functionality of the equipment while ensuring the stability of the equipment operation.

[0014] In a preferred solution, a sleeve rod is horizontally sleeved on the end of the output shaft of the electric push rod, and a spring is horizontally connected between the inside of the sleeve rod and the output end of the electric push rod.

[0015] By providing a sleeve rod structure sleeved on the output end of the electric push rod, as the electric push rod pushes the slide to move, after the sealing ring is tightened, the output end of the electric push rod that continues to be pushed will overcome the resistance of the spring and move toward the inside of the sleeve rod, thereby ensuring that the sealing ring will not be pushed by the electric push rod and become too straight, thereby ensuring the integrity of the operation of the equipment and the quality of the sealing ring after trimming.

[0016] In a preferred solution, a push plate is slidably distributed inside the vertical pole, a second elastic member is horizontally connected between the push plate and the vertical pole, and the push plate is pressed and fitted to the side surface of the arc-shaped member.

[0017] By providing a push plate structure with a first elastic member, the rotated arc-shaped member is pushed, so that the rotating shaft and the arc-shaped slot generate extrusion force, thereby forming a supporting force for the cutting ring to ensure the stability of the cutting ring during operation.

[0018] As can be seen from the above, the trimming device for semiconductor seal processing provided by the present invention has the following improvements and advantages compared with the prior art:

[0019] First, a slide structure is provided which utilizes a guide rail to slide on the top of the machine, and is pushed horizontally by an electric push rod, so that the slide moves horizontally. While moving, the driving wheel and the auxiliary wheel are used to position the loose sealing ring placed on the top of the machine so that it is squeezed and tightened. At the same time, the gradually tightened sealing ring can generate a horizontal driving force on the positioning wheels on both sides of the slide, so that the engaging parts at the bottom of the positioning wheels move synchronously with the movement of the positioning wheels and engage with the inside of the engaging groove, thereby positioning the slide. It can adapt to sealing rings of various sizes, ensure that the sealing rings are in the best trimming shape, and ensure the quality of the trimmed sealing ring products.

[0020] Secondly, when the sealing ring rotates synchronously with the rotation of the driving wheel, the two additional cutting ring structures with opposite blades arranged on the slide can perform comprehensive trimming processing on the rotating sealing ring, thereby replacing the manual trimming work of large sealing rings, greatly improving the efficiency and convenience of trimming processing; at the same time, the cutting ring is connected by an arc-shaped part with an arc-shaped groove and a vertical rod with a rotating shaft. The user can freely adjust the placement direction of the cutting ring by rotating the arc-shaped part, and then use the mutual extrusion of the rotating shaft and the arc-shaped groove to improve the functionality of the equipment while ensuring the stability of the equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1This is a schematic diagram of the overall structure of a trimming device for semiconductor sealing component processing proposed by the present invention.

[0022] Figure 2 This is a schematic diagram of the slide structure of a trimming device for semiconductor seal processing proposed by the present invention.

[0023] Figure 3 This is a schematic diagram of the driving wheel transmission structure of a trimming device for semiconductor seal processing proposed by the present invention.

[0024] Figure 4 This is a top view of a stretching mechanism of a trimming device for semiconductor sealing component processing proposed by the present invention.

[0025] Figure 5 The present invention provides a side view of a stretching mechanism of a trimming device for processing semiconductor seals.

[0026] Figure 6 The present invention provides a cross-sectional view of the sleeve rod structure of a trimming device for semiconductor seal processing.

[0027] Figure 7 The present invention provides a cross-sectional view of the side end structure of a slide table of a trimming device for processing semiconductor seals.

[0028] Figure 8 The present invention provides a cross-sectional view of the vertical pole structure of a trimming device for semiconductor sealing component processing.

[0029] Fig. 9 This is a schematic diagram of the overall state of the sealing ring of the trimming equipment for semiconductor sealing component processing proposed by the present invention after installation.

[0030] In the figure: 1, machine; 2, driving wheel; 3, stretching mechanism; 301, guide rail; 302, slide; 303, auxiliary wheel; 304, side wheel; 305, electric push rod; 306, engaging member; 307, engaging groove; 308, first elastic member; 309, sleeve rod; 310, spring; 311, positioning wheel; 4, cutting mechanism; 401, vertical pole; 402, rotating shaft; 403, arc member; 404, arc-shaped slot; 405, cutting ring; 406, push plate; 407, second elastic member; 408, quick interface; 5, retention groove; 6, motor; 7, belt; 8, positioning plate. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] The invention discloses a trimming device for semiconductor sealing component processing, which is mainly used in the trimming of large semiconductor sealing rings.

[0033] Reference Figures 1 to 9 , a trimming device for semiconductor seal processing, comprising a machine platform 1, a driving wheel 2 is rotatably mounted on the top of one end of the machine platform 1, and a stretching mechanism 3 adapted to and supporting the sealing ring is arranged on the top of the other end of the machine platform 1;

[0034] A cutting mechanism 4 for trimming the sealing ring is provided on the side of the stretching mechanism 3;

[0035] The sealing ring to be trimmed is adapted and supported by the stretching mechanism 3, and the trimming of the large sealing ring is completed by the rotation of the driving wheel 2 and the operation of the cutting mechanism 4.

[0036] In this embodiment: the operator holds the two ends of the large sealing ring and places the sealing ring on the top of the machine 1, so that the two ends of the sealing ring are respectively sleeved on the outside of the driving wheel 2 and the stretching mechanism 3, and then the user starts the stretching mechanism 3, causing the stretching mechanism 3 to move horizontally, and at the same time cooperates with the driving wheel 2 to pull the sealing ring, so that the originally loose sealing ring is gradually stretched and straightened. At this time, the operator engages the two sides of the stretched sealing ring into the inside of the cutting mechanism 4, and causes the driving wheel 2 to rotate. The rotating driving wheel 2 will drive the sealing ring to rotate synchronously, and the rotating sealing ring will be trimmed by the cutting mechanism 4 until the trimming operation of the entire sealing ring is completed.

[0037] Among them, it is necessary to supplementally explain that: a motor 6 is installed on the top of one end of the machine 1, and a belt 7 is connected between the motor 6 and the bottom transmission sleeve of the driving wheel 2; when the motor 6 is started, the rotating motor 6 will drive the driving wheel 2 to rotate synchronously through the belt 7, and the rotating driving wheel 2 will drive the sealing ring to rotate synchronously.

[0038] In the above scheme, considering that sealing rings of different sizes are subjected to trimming processing, the stretching amplitude of the sealing ring driven by the stretching mechanism 3 also needs to be changed accordingly, and the specific operation is as follows.

[0039] Reference Figure 1 to Figure 2 , Figures 4 to 7In a preferred embodiment, the stretching mechanism 3 includes a guide rail 301 arranged at one end of the top of the machine 1, a slide 302 is slidably installed inside the guide rail 301, an auxiliary wheel 303 is rotatably installed at one end of the slide 302, two side wheels 304 are installed on each side of the slide 302, and a positioning wheel 311 is movably arranged in the middle of both sides of the slide 302. In the initial state, the distance between the positioning wheel 311 and the slide 302 is greater than the distance between the side wheel 304 and the slide 302. When the positioning wheel 311 is under pressure, the distance from the positioning wheel 311 to the slide 302 is equal to the distance from the side wheel 304 to the slide 302. An electric push rod 305 is provided at one end of the guide rail 301. The electric push rod 305 is installed on the top of the machine 1. The output end of the electric push rod 305 is connected to the slide 302. A clamping piece 306 is provided at the bottom of each positioning wheel 311. Clamping grooves 307 are provided on both sides of the guide rail 301. The clamping piece 306 is clamped inside the clamping groove 307.

[0040] In this embodiment: the operator holds the two ends of the large sealing ring and places the sealing ring on the top of the machine 1, so that the two ends of the sealing ring are respectively sleeved on the outside of the driving wheel 2 and the auxiliary wheel 303, and then the user starts the electric push rod 305, so that the output end of the electric push rod 305 extends outward and pushes the slide 302, so that the slide 302 moves horizontally along the guide rail 301, and while moving, the driving wheel 2 pulls the sealing ring, so that the originally loose sealing ring is gradually pulled and straightened. In the process of straightening, the two sides of the sealing ring will gradually fit and squeeze the positioning wheels 311 on both sides of the slide 302, so that the positioning wheels 311 move horizontally toward the middle of the slide 302 until the engaging member 306 at the bottom of the positioning wheel 311 is engaged with the engaging member 306. The inside of the engagement groove 307 (at this time, the distance between the positioning wheel 311 and the side wheel 304 and the slide 302 is the same), and the sealing ring between the two side wheels 304 is always kept in a straightened state. At this time, the electric push rod 305 can no longer push the slide 302 to move, and the straightened sealing ring has reached the optimal shape for trimming; wherein, the end of the output shaft of the electric push rod 305 is horizontally sleeved with a sleeve rod 309, and a spring 310 is horizontally connected between the inside of the sleeve rod 309 and the output end of the electric push rod 305. When the engaging piece 306 at the bottom of the positioning wheel 311 is engaged with the inside of the engaging groove 307, the output shaft of the electric push rod 305 that continues to advance will overcome the resistance of the spring 310 and move toward the inside of the sleeve rod 309, thereby preventing the sealing ring from being over-tightened.

[0041] Among them, it is necessary to supplement that: a first elastic member 308 is horizontally fixed between the top of each positioning wheel 311 and the interlayer of the slide 302; when the positioning wheel 311 loses the extrusion of the sealing ring, the first elastic member 308 that loses the extrusion restriction can push the positioning wheel 311 to reset and move, and a number of evenly distributed retention grooves 5 are horizontally opened on the side of the slide 302, and the retention grooves 5 and the positioning wheels 311 are symmetrically distributed, and the moving positioning wheel 311 can enter the interior of the retention groove 5, thereby preventing the positioning wheel 311 from being squeezed by the slide 302.

[0042] Further, it is supplemented that: a positioning plate 8 is symmetrically fixed on both sides of the top of the machine 1, and the positioning plates 8 are distributed on both sides of the electric push rod 305. When the user is installing the sealing ring, the two symmetrically distributed positioning plates 8 can assist in the placement of the sealing ring.

[0043] In the above scheme, in order to perform trimming processing on the tightened sealing ring, the specific operations are as follows.

[0044] Reference Figure 1 , Figures 4 to 8 In a preferred embodiment, the cutting mechanism 4 includes a vertical rod 401 horizontally fixed on both sides of the slide 302, a rotating shaft 402 is horizontally fixed at one end of the vertical rod 401, an arc-shaped member 403 is provided at one end of the vertical rod 401, an arc-shaped slot 404 is horizontally opened on the side of the arc-shaped member 403, the rotating shaft 402 horizontally passes through the arc-shaped slot 404, so that the arc-shaped member 403 and the vertical rod 401 are connected, and a cutting ring 405 is horizontally fixed on the side of the arc-shaped member 403, and the blades of the two symmetrically distributed cutting rings 405 face opposite directions, and are placed in one horizontal and one vertical direction.

[0045] In this embodiment: after the sealing ring is tightened, the worker inserts the two sides of the sealing ring into the inside of the two cutting rings 405 respectively, and drives the driving wheel 2 to rotate through the motor 6, and the outer side of the rotating driving wheel 2 will continuously come into contact with the cutting ring 405 by extrusion, so that the excess burrs are cut off by the cutting ring 405; wherein, a push plate 406 is slidably distributed inside the vertical rod 401, and a second elastic member 407 is horizontally connected between the push plate 406 and the vertical rod 401, and the push plate 406 is pressed and fitted to the side of the arc-shaped member 403. When the user needs to change the placement direction of the blade on the cutting ring 405, the user can push the cutting ring horizontally. 405, causing the cutting ring 405 to drive the arc-shaped member 403 to move horizontally, allowing the rotating shaft 402 inside the vertical rod 401 to move along the arc-shaped slot 404 inside the arc-shaped member 403, until the rotating shaft 402 moves to the middle and both sides of the arc-shaped slot 404. At this time, the user releases the hand that pushes the arc-shaped member 403, and the second elastic member 407 that loses the extrusion restriction will immediately reset and push the arc-shaped member 403 through the push plate 406, causing the arc-shaped member 403 to reset and move and use the arc-shaped slot 404 and the rotating shaft 402 to form extrusion. At this time, the placement angle of the cutting ring 405 is changed and fixed.

[0046] It should be noted that each cutting ring 405 is provided with a quick interface 408 on its outer side. The user can quickly insert the sealing ring into the cutting ring 405 by aligning the side of the sealing ring with the quick interface 408 and pressing.

[0047] Working principle: When in use, the operator holds the two ends of the large sealing ring and places the sealing ring on the top of the machine 1, so that the two ends of the sealing ring are respectively sleeved on the outside of the driving wheel 2 and the auxiliary wheel 303. Then the user starts the electric push rod 305, so that the output end of the electric push rod 305 extends outward and pushes the slide 302, so that the slide 302 moves horizontally along the guide rail 301. While moving, the driving wheel 2 pulls the sealing ring, so that the originally loose sealing ring is gradually pulled and tightened. During the straightening process, the two sides of the sealing ring will gradually fit and squeeze the positioning wheels 311 on both sides of the slide 302, causing the positioning wheels 311 to move horizontally toward the middle of the slide 302 until the engaging piece 306 at the bottom of the positioning wheel 311 is engaged with the inside of the engaging groove 307. At this time, the output shaft of the electric push rod 305 that continues to advance will overcome the resistance of the spring 310 and move toward the inside of the sleeve rod 309, thereby preventing the sealing ring from being over-tightened, and the straightened sealing ring has reached the best shape for trimming. After the sealing ring is tightened, the worker inserts the two sides of the sealing ring into the inside of the two cutting rings 405 through the quick interface 408, and drives the driving wheel 2 to rotate through the motor 6. The outer side of the rotating driving wheel 2 will continuously come into contact with the cutting ring 405, so that the excess burrs are cut off by the cutting ring 405. When the user needs to change the placement direction of the cutting edge on the cutting ring 405, the user can push the cutting ring 405 horizontally, so that the cutting ring 405 drives the arc-shaped member 403 to move horizontally, so that the inside of the vertical rod 401 The rotating shaft 402 moves along the arc groove 404 inside the arc member 403 until the rotating shaft 402 moves to the middle and both sides of the arc groove 404. At this time, the user releases the hand that pushes the arc member 403, and the second elastic member 407 that loses the extrusion restriction will immediately reset and push the arc member 403 through the push plate 406, causing the arc member 403 to reset and move and use the arc groove 404 and the rotating shaft 402 to form extrusion. At this time, the placement angle of the cutting ring 405 is changed and fixed.

[0048] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A trimming device for semiconductor sealing component processing, comprising a machine platform (1), characterized in that: A driving wheel (2) is rotatably mounted on the top of one end of the machine (1), and a stretching mechanism (3) adapted to and supporting the sealing ring is provided on the top of the other end of the machine (1); A cutting mechanism (4) for trimming the sealing ring is provided on the side of the stretching mechanism (3); The sealing ring to be trimmed is adapted and supported by the stretching mechanism (3), and the trimming of the large sealing ring is completed by utilizing the rotation of the driving wheel (2) in coordination with the operation of the cutting mechanism (4); The stretching mechanism (3) comprises a guide rail (301) arranged at one end of the top of the machine (1), a slide (302) is slidably mounted inside the guide rail (301), an auxiliary wheel (303) is rotatably mounted at one end of the slide (302), two side wheels (304) are respectively mounted on both sides of the slide (302), a positioning wheel (311) is movably arranged in the middle of both sides of the slide (302), in an initial state, the distance between the positioning wheel (311) and the slide (302) is greater than the distance between the side wheel (304) and the slide (302), and the positioning wheel (311) is In the pressed state, the distance from the positioning wheel (311) to the slide (302) is equal to the distance from the side wheel (304) to the slide (302); an electric push rod (305) is provided at one end of the guide rail (301); the electric push rod (305) is installed on the top of the machine (1); the output end of the electric push rod (305) is connected to the slide (302); a clamping piece (306) is provided at the bottom of each positioning wheel (311); clamping grooves (307) are provided on both sides of the guide rail (301); the clamping piece (306) is clamped in the inside of the clamping groove (307).

2. The trimming equipment for semiconductor sealing component processing according to claim 1, characterized in that: The cutting mechanism (4) comprises a vertical rod (401) fixed horizontally on both sides of the slide (302); a rotating shaft (402) is fixed horizontally at one end of the vertical rod (401); an arc-shaped member (403) is provided at one end of the vertical rod (401); an arc-shaped slot (404) is horizontally opened on the side of the arc-shaped member (403); the rotating shaft (402) passes through the arc-shaped slot (404) horizontally to connect the arc-shaped member (403) and the vertical rod (401); a cutting ring (405) is fixed horizontally on the side of the arc-shaped member (403); and the blades of the two symmetrically distributed cutting rings (405) face opposite directions, and are placed in one horizontal direction and the other vertical direction.

3. The trimming equipment for semiconductor sealing component processing according to claim 2, characterized in that: A first elastic member (308) is horizontally fixed between the top of each positioning wheel (311) and the interlayer of the slide table (302).

4. The trimming equipment for semiconductor sealing component processing according to claim 3, characterized in that: A sleeve rod (309) is horizontally sleeved on the end of the output shaft of the electric push rod (305), and a spring (310) is horizontally connected between the inside of the sleeve rod (309) and the output end of the electric push rod (305).

5. The trimming equipment for semiconductor sealing component processing according to claim 4, characterized in that: A push plate (406) is slidably distributed inside the vertical rod (401), a second elastic member (407) is horizontally connected between the push plate (406) and the vertical rod (401), and the push plate (406) is pressed and fitted to the side surface of the arc-shaped member (403).

6. The trimming equipment for semiconductor sealing component processing according to claim 4, characterized in that: The outer side of each cutting ring (405) is provided with a quick interface (408).

7. The trimming equipment for semiconductor sealing component processing according to claim 6, characterized in that: A plurality of evenly distributed retention grooves (5) are horizontally opened on the side surface of the slide (302), and the retention grooves (5) and the positioning wheels 311 are symmetrically distributed.

8. The trimming equipment for semiconductor sealing component processing according to claim 7, characterized in that: A motor (6) is installed on the top of one end of the machine platform (1), and a belt (7) is connected between the motor (6) and the bottom transmission sleeve of the driving wheel (2).

9. The trimming equipment for semiconductor sealing component processing according to claim 8, characterized in that: A positioning plate (8) is symmetrically fixed on both sides of the top of the machine platform (1), and the positioning plate (8) is distributed on both sides of the electric push rod (305).

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