CN220104637U - Needle tip puncture force tester for injection needle - Google Patents

Abstract

The utility model relates to a needle point puncture force tester of an injection needle, which comprises a machine body, and a needle point fixing part and a sample fixing part which are arranged on the machine body, wherein the needle point fixing part comprises a driving part, a clamping part and a limiting part, the clamping part comprises a clamping frame, two first guide rods, a compression spring and a clamping block group, the two first guide rods are arranged on the inner side of the clamping frame in parallel, one first guide rod is fixedly connected with the upper end of the clamping frame, and the other first guide rod is fixedly connected with the lower end of the clamping frame; two ends of the clamping block group are respectively connected in a sliding way along the two first guide rods, and compression springs are respectively sleeved on the first guide rods at two sides of the clamping block group; the clamping block group comprises a first clamping block and a second clamping block, and the first clamping block and the second clamping block are mutually inserted and arranged. The utility model can ensure the clamping and fixing effect on the injection needle, ensure the accuracy of the final detection result and facilitate the operation of staff.

Description

Injection needle tip penetration force tester

Technical field

The utility model relates to the technical field of injection needle detection, in particular to an injection needle tip puncture force tester.

Background technique

In clinical work, injecting drugs into patients and drawing blood in laboratories is a commonly used treatment method in Western medicine. Injection needles mainly include intramuscular syringe needles, intravenous injection needles, intravenous indwelling needles, etc. These medical injection needles are all hollow stainless steel needles. Injection needles The amount of needle used is very large, and the test of the puncture force of the injection needle is an important indicator to measure whether the medical needle is qualified.

The needle tip penetration force tester provided in the related art cannot fix the detection needle well during use, and it is also inconvenient for staff to operate. It is time-consuming and labor-intensive and the accuracy of the detection results is affected. Therefore, an easy-to-use method is needed. Injection needle tip penetration force tester.

Utility model content

In order to solve the problem that the needle tip cannot be well fixed during the detection process, the utility model provides a needle tip puncture force tester.

The needle tip puncture force tester provided by this utility model adopts the following technical solution:

An injection needle tip penetration force tester includes a body and a needle tip fixing part and a sample fixing part provided on the body. The needle tip fixing part includes a driving part, a clamping part and a limiting part. The clamping part includes a clamp. A tightening frame, two first guide rods, a compression spring and a clamping block group. The two first guide rods are arranged in parallel inside the clamping frame, and one of the first guide rods is connected to the upper end of the clamping frame. Fixed connection, the other first guide rod is fixedly connected to the lower end of the clamping frame, and the compression springs are respectively set on the first guide rods on both sides of the clamp block group; the clamp block group It includes a first clamping block and a second clamping block. A plurality of first chute slots are evenly spaced on the side of the first clamping block close to the second clamping block. There is a gap between two adjacent first chute slots. It is a first sliding piece; the side of the second clamping block close to the first clamping block is provided with a plurality of second slide grooves that are adapted to the first sliding piece; the lower surface of the clamping frame is fixedly connected The side of the driving member and the clamping frame away from the sample fixing part is fixedly connected to the limiting member.

By adopting the above technical solution, the compression spring provides elastic force, and the first slide block of the first clamp block is inserted into the second slide groove of the second clamp block, so that the first slide block can be inserted into the second chute of the second clamp block. The clamping hole between the clamping block and the second clamping block becomes smaller, thereby achieving the effect of clamping the needle tip of the injection needle, making it convenient for the staff to clamp the needle tip, and at the same time, it is also convenient to detect the needle tip of the clamped injection needle. .

Preferably, the limiting member includes a second threaded rod, a second limiting rod and a limiting plate, the axis of the second threaded rod is parallel to the axis of the first limiting rod, and the limiting plate One end is slidingly connected to the second limiting rod, and the other end of the limiting plate is threadedly connected to the second threaded rod; one end of the second limiting rod is fixedly connected to one end of the side of the clamping frame, so One end of the second threaded rod is rotationally connected to the other end of the side of the clamping frame.

By adopting the above technical solution, the injection needle can be further fixed. By twisting the second threaded rod, the limiting plate moves along the axis of the second threaded rod until the side surface of the limiting plate is in contact with the second threaded rod. The bottom of the injection needle is in contact, that is, the injection needle is placed to slide, which facilitates the operation of the staff and at the same time ensures the detection effect of the injection needle tip, which is conducive to improving the safety of use of the device.

Preferably, the limiting member further includes a knob, one side of which is fixedly connected to the other end of the second threaded rod.

By adopting the above technical solution, the operation of the staff is facilitated and the driving of the limiting plate is facilitated.

Preferably, the clamping member further includes two levers, one of which is fixedly connected to the side of the first clamping block and the other of which is fixedly connected to the side of the second clamping block.

By adopting the above technical solution, it is convenient for workers to use it, and it is convenient to move the first clamping block and the second clamping block in opposite directions, which is further beneficial to clamping and fixing the injection needle, which is convenient and practical.

Preferably, the driving member includes a motor, a first threaded rod and a threaded slider, the output end of the motor is fixedly connected to the first threaded rod, and the threaded slider is sleeved on the first threaded rod. The threaded slider is threadedly connected to the first threaded rod, and the upper surface of the threaded slider is fixedly connected to the lower surface of the clamping frame.

By adopting the above technical solution, it is beneficial to realize the driving of the clamping part, and thereby realize the movement of the injection needle clamped by the clamping part to the sample fixing part, which is beneficial to realize the needle tip puncture force of the injection needle. detection.

Preferably, the driving member further includes two first limiting rods, two limiting slide blocks and a fixed block, the axes of the two first limiting rods are parallel to the axis of the first threaded rod, The two ends of the two first limiting rods are fixedly connected to the body through the fixed blocks; the two limiting slide blocks are respectively sleeved on the two first limiting rods, and the two limiting slide blocks are respectively sleeved on the two first limiting rods. The limiting slide blocks are respectively located on both sides of the clamping frame, and the two limiting slide blocks are fixedly connected to the clamping frame.

By adopting the above technical solution, the clamping frame moves along the two first limiting rods, and the clamping frame is placed to rotate along the first threaded rods, which is beneficial to ensuring the movement of the clamping member. The stability during the process will help ensure the accuracy of the final test results.

Preferably, the sample fixing part includes a fixing frame, a fixing part and an adjusting part. The fixing part includes a pressure plate, a bottom plate, two second guide rods, a connecting plate and a pressure spring. The lower surface of the bottom plate is fixedly connected to the fixing part. On the upper surface of the frame, two second guide rods are arranged in parallel; the lower end of one second guide rod passes through one end of the bottom plate and through the fixed frame and is fixedly connected to the upper surface of the connecting plate, and the upper end is fixed One end is connected to the lower surface of the pressure plate; the lower end of the pressure spring is fixedly connected to the upper surface of the connecting plate, and the upper end is fixedly connected to the fixed frame; the lower surface of the connecting plate is connected to the adjusting member.

By adopting the above technical solution, the pressure spring pushes the connecting plate, causing the connecting plate to move downward by driving the second guide rod, and the two second guide rods pull the pressure plate downward, so that the The pressing plate presses the bottom plate to fix the sample.

Preferably, the adjustment member includes a pressure rod, a connecting block, a first slide block, an adjustment plate and a second slide block, and the lower end of the pressure rod passes through the upper surface of the fixed frame and is fixedly connected to the upper surface of the connecting block, The lower surface of the connecting block is provided with a first chute that matches the upper end of the first slider. The side of the first slider is hinged to one end of the adjustment plate, and the middle part of the adjustment plate is connected to the fixed The frame is rotatably connected, and the other end of the adjustment plate is hinged to the side of the second slider; a chute that matches the upper end of the second slider is provided on the lower surface of the connection plate.

By adopting the above technical solution, by pressing the pressure rod, the pressure rod drives the connecting block to move downward, the connecting block drives the first slider to move downward, and the first slider drives the One end of the adjustment plate moves downward, and at the same time, because the adjustment plate and the fixed frame form a lever, the other end of the adjustment plate drives the second slider to rise, and then the second slider drives the connection The plate moves, and the connecting plate drives the two second guide rods to separate the pressure rod from the bottom plate, thereby releasing the sample. At the same time, the first slide block slides with the connecting block. The second slide block is slidably connected to the lower surface of the connecting plate, which is beneficial to the normal rotation of the adjusting plate.

To sum up, the utility model has the following beneficial technical effects:

1. The innovative point of this utility model is to provide a clamping block group that can snap into each other. The first sliding plate of the first clamping block is inserted into the second chute of the second clamping block. Through the compression The spring provides thrust, which can clamp the injection needle, and is also convenient for staff to use, making it highly practical;

2. The utility model also provides a limiter, that is, by setting the limiter plate that can slide to adjust the position, the bottom of the injection needle is supported to prevent the injection needle from sliding during the detection process, which is beneficial to Ensure the stability of the final measurement results;

3. The sample fixing part provided by the utility model can no longer clamp the sample by pressing the pressure rod, which facilitates the installation and fixation of the sample. At the same time, the transmission is reasonable during the pressing process of the pressure rod. No lagging will occur, making it easy for staff to use.

Description of the drawings

Figure 1 is a schematic diagram of the overall structure of this embodiment.

Figure 2 is a schematic structural diagram of the needle tip fixing part of this embodiment;

Figure 3 is a schematic structural diagram of the needle tip fixing part of this embodiment from another perspective;

Figure 4 is a schematic structural diagram of the sample fixing part of this embodiment.

Explanation of reference signs: 1. Body; 2. Needle tip fixing part; 21. Driving member; 211. Motor; 212. First threaded rod; 213. Threaded slider; 214. First limiting rod; 215. Limiting slide block; 216, fixed block; 22, clamping piece; 221, clamping frame; 222, first guide rod; 223, compression spring; 224, clamping block group; 2241, first clamping block; 2242, second clamping block ; 225. Lever; 23. Limiting piece; 231. Second threaded rod; 232. Second limiting rod; 233. Limiting plate; 234. Knob; 3. Sample fixing part; 31. Fixed frame; 32. Fixed piece; 321, pressure plate; 322, bottom plate; 323, second guide rod; 324, connecting plate; 325, pressure spring; 33, adjusting piece; 331, pressure rod; 332, connecting block; 333, adjusting plate.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all implementations. example. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.

The utility model will be further described in detail below with reference to the accompanying drawings 1-4.

The injection needle tip penetration force tester, with reference to Figures 1-4, includes a body 1 and a needle tip fixing part 2 and a sample fixing part 3 provided on the body 1. The needle tip fixing part 2 includes a driving part 21 and a clamping part. 22 and the limiting member 23. The clamping part includes a clamping frame 221, two first guide rods 222, a compression spring 223 and a clamp block group 224. The two first guide rods 222 are arranged in parallel on the clamp. Inside the tightening frame 221, one of the first guide rods 222 is fixedly connected to the upper end of the clamping frame 221, and the other first guide rod 222 is fixedly connected to the lower end of the clamping frame 221. The clamp block group The first guide rods 222 on both sides of 224 are respectively provided with the compression springs 223, that is, the compression springs 223 on both sides of the clamping block group 224 compress the clamping block group 224, so that the The clamping block group 224 moves along the axes of the two first guide rods 222. At the same time, by providing the two first guide rods 222, it is helpful to prevent the clamping block group 224 from rotating, which is beneficial to further realizing the injection needle. The fixation is beneficial to ensure the accuracy of the final measurement result; the clamp block group 224 includes a first clamp block 2241 and a second clamp block 2242, the first clamp block 2241 is spaced close to the side of the second clamp block 2242 A plurality of first slide grooves are evenly provided, and a first sliding piece is between two adjacent first slide grooves; the second clamping block 2242 is provided with a plurality of first sliding grooves on the side close to the first clamping block 2241 The second slide groove adapted to the first slide allows the first clamp block 2241 and the second clamp block 2242 to be inserted into each other, which is beneficial to adjusting the first clamp block 2241 and the second slide groove. The size of the clamping hole between the second clamping blocks 2242 and the power provided by the compression spring 223 are conducive to ensuring the clamping effect of the injection needle and making it convenient for workers to install and disassemble the injection needle; the clamping The lower surface of the frame 221 is fixedly connected to the driving member 21 to facilitate the movement of the clamping member 22 through the driving member 21 to detect the puncture force of the injection needle tip. The clamping frame 221 is away from the sample. The side surface of the fixing part 3 is fixedly connected to the limiting member 23, which is beneficial to fixing the bottom of the injection needle and preventing the injection needle from sliding.

As shown in Figure 2, the limiting member 23 includes a second threaded rod 231, a second limiting rod 232 and a limiting plate 233. The axis of the second threaded rod 231 is consistent with the first limiting rod 214. The axis of the limit plate 233 is parallel, one end of the limit plate 233 is slidingly connected to the second limit rod 232, and the other end of the limit plate 233 is threadedly connected to the second threaded rod 231, that is, by rotating the second The threaded rod 231 can make the limiting plate 233 move along the second limiting rod 232, so that the side surface of the limiting plate 233 contacts the bottom of the injection needle, thereby preventing the injection needle from detecting the needle tip puncture force. is sliding to ensure the accuracy of the final detection result; one end of the second limiting rod 232 is fixedly connected to one end of the side of the clamping frame 221, and one end of the second threaded rod 231 is connected to the clamping frame 221 The other end of the side is rotated to connect.

As shown in Figure 2, the limiter 23 also includes a knob 234. One side of the knob 234 is fixedly connected to the other end of the second threaded rod 231, which is convenient for the staff to operate, that is, to facilitate the realization of the limiter. Position adjustment of the bit plate 233.

As shown in Figure 3, the clamping member 22 also includes two levers 225, one of which is fixedly connected to the side of the first clamping block 2241, and the other of which is fixedly connected to the side of the first clamping block 2241. The side of the second clamping block 2242 is convenient for the staff to use, that is, by pushing the two levers 225, the first clamping block 2241 and the second clamping block 2242 are separated, thereby facilitating the placement of the injection needle. and take.

As shown in Figure 2, the driving member 21 includes a motor 211, a first threaded rod 212 and a threaded slider 213. The output end of the motor 211 is fixedly connected to the first threaded rod 212. The threaded slider The block 213 is sleeved on the first threaded rod 212, the threaded slider 213 is threadedly connected to the first threaded rod 212, and the upper surface of the threaded slider 213 is fixedly connected to the lower surface of the clamping frame 221, That is, the motor 211 drives the first threaded rod 212 to rotate, so that the threaded slider 213 drives the clamping part to move, so as to facilitate detection of the puncture force of the injection needle tip.

As shown in Figure 2, the driving member 21 also includes two first limiting rods 214, two limiting slide blocks 215 and a fixed block 216. The axes of the two first limiting rods 214 are aligned with the respective The axes of the first threaded rod 212 are parallel, and the two ends of the two first limiting rods 214 are fixedly connected to the body 1 through the fixed blocks 216 respectively; the two limiting slide blocks 215 are respectively sleeved On the two first limiting rods 214, the two limiting slide blocks 215 are respectively located on both sides of the clamping frame 221. The two limiting slide blocks 215 are in contact with the clamping frame 221. The fixed connection, through the two limit sliders 215, enhances the support effect of the clamping frame 221, which is conducive to ensuring the stability of the clamping part, and thus is conducive to ensuring the accuracy of the final detection result.

As shown in Figure 4, the sample fixing part 3 includes a fixing frame 31, a fixing part 32 and an adjusting part 33. The fixing part 32 includes a pressure plate 321, a bottom plate 322, two second guide rods 323, a connecting plate 324 and Pressure spring 325, the lower surface of the bottom plate 322 is fixedly connected to the upper surface of the fixed frame 31, two second guide rods 323 are arranged in parallel; the lower end of one second guide rod 323 passes through one end of the bottom plate 322 And it passes through the fixed frame 31 and is fixedly connected to the upper surface of the connecting plate 324, and the upper end is fixedly connected to one end of the lower surface of the pressure plate 321; the lower end of the pressure spring 325 is fixedly connected to the upper surface of the connecting plate 324, and the upper end is fixedly connected. The fixed frame 31 causes the pressure spring 325 to push the connecting plate 324 to move downward. The connecting plate 324 drives the two second guide rods 323 to move downward. The two second guide rods 323 drives the pressure plate 321 to move downward, that is, the pressure plate 321 and the bottom plate 322 jointly clamp the sample; the lower surface of the connecting plate 324 is connected to the adjustment member 33 to facilitate adjustment through the adjustment member 33 The position of the connecting plate 324 facilitates the adjustment of the position of the pressure plate 321 .

As shown in Figure 4, the adjustment member 33 includes a pressure rod 331, a connecting block 332, a first slider, an adjustment plate 333 and a second slider. The lower end of the pressure rod 331 passes through the upper surface of the fixed frame 31. It is fixedly connected to the upper surface of the connecting block 332. The lower surface of the connecting block 332 is provided with a first slide groove that matches the upper end of the first slider. The side of the first slider is in contact with the adjustment plate 333. One end of the adjustment plate 333 is hinged, the middle part of the adjustment plate 333 is rotationally connected to the fixed frame 31, the other end of the adjustment plate 333 is hinged to the side of the second slider; the lower surface of the connection plate 324 is provided with a The matching chute at the upper end of the slider means that by pressing the pressure rod 331, one end of the adjustment plate 333 moves downward, and at the same time due to the lever principle, the other end of the adjustment plate 333 moves upward, that is, Push the connecting plate 324 to move the pressure plate 321 upward, making it convenient to place and take the sample.

The implementation principle of this embodiment is as follows: when placing the sample, press the pressure rod so that the pressure rod moves downward, the pressure rod drives the connecting block to move downward, and the connecting block drives the first slider to move downward. , the first slider drives one end of the adjustment plate to move downward, and at the same time, because the middle part of the adjustment plate is rotationally connected to the fixed frame, the other end of the adjustment plate moves upward, thereby causing the second slider to move upward. The block moves upward, and while the adjustment plate is rotating, the first slide block slides along the lower surface of the connecting block, the second slide block slides along the lower surface of the connecting plate, and the second slide block slides along the lower surface of the connecting block. The block pushes the connecting plate to move upward, and the connecting plate moves the pressure plate upward through the two second guide rods, so that the pressure plate is separated from the bottom plate, thereby realizing the placement of the sample. After the sample is placed, Release the pressure rod, and the connecting plate moves downward due to the elastic force of the pressure spring. The connecting plate moves the pressure plate downward through the two second guide rods, thereby making the pressure plate and the pressure plate move downward. The bottom plates jointly compress the sample; to place the injection needle, push the two levers to both sides to separate the first clamping block and the second clamping block, and place the injection needle where In the clamping hole between the first clamping block and the second clamping block, the first clamping block and the second clamping block are respectively subjected to the elastic force of the compression spring along the first guide rod. Relative movement causes the first sliding plate of the first clamping block to be inserted into the second slide groove of the second clamping block, so that the clamping hole between the first clamping block and the second clamping block becomes downward, Then, the injection needle is clamped; the second threaded rod is rotated to cause the limit plate to move along the second limit rod, so that the side of the limit plate contacts the bottom of the injection needle to prevent injection. The needle slides, ensuring the accuracy of the final measurement result.

It should be noted that in this document, terms such as "comprises", "comprises" or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article or device that includes a series of elements not only includes those elements , but also includes other elements not expressly listed or inherent in such process, method, article or equipment. Without further limitation, an element defined by the statement "comprises a..." does not exclude the presence of additional identical elements in a process, method, article, or apparatus that includes the stated element.

The above are all preferred embodiments of the present utility model, and do not limit the scope of protection of the present utility model. Therefore, all equivalent changes based on the structure, shape, and principle of the present utility model should be covered by the present utility model. within the scope of protection.

Claims (8)

1. Injection needle tip puncture force tester, including a body (1) and a needle tip fixing part (2) and a sample fixing part (3) provided on the body (1), characterized by: the needle tip fixing part (3) 2) It includes a driving part (21), a clamping part (22) and a limiting part (23). The clamping part (22) includes a clamping frame (221), two first guide rods (222), a compression Spring (223) and clamp block group (224), two first guide rods (222) are arranged in parallel inside the clamping frame (221), one of the first guide rods (222) is connected to the The upper end of the clamping frame (221) is fixedly connected, and the other first guide rod (222) is fixedly connected to the lower end of the clamping frame (221); both ends of the clamping block group (224) are respectively along the two The first guide rod (222) is slidingly connected, and the compression springs (223) are respectively set on the first guide rods (222) on both sides of the clamp block group (224); the clamp block group (224) ) includes a first clamping block (2241) and a second clamping block (2242). The first clamping block (2241) has a plurality of first chute evenly spaced on the side close to the second clamping block (2242), Between the two adjacent first slide grooves is a first sliding piece; the second clamping block (2242) is provided with a plurality of holes on the side close to the first clamping block (2241) that are connected to the first sliding piece. The second chute is adapted to the piece phase; the lower surface of the clamping frame (221) is fixedly connected to the driving member (21), and the side of the clamping frame (221) away from the sample fixing part (3) is fixed Connect the limiter (23). 2. The injection needle tip penetration force tester according to claim 1, characterized in that: the limiter (23) includes a second threaded rod (231), a second limiter rod (232) and a limiter plate. (233), the axis of the second threaded rod (231) is parallel to the axis of the second limiting rod (232), and one end of the limiting plate (233) is connected to the second limiting rod (232) Sliding connection, the other end of the limiting plate (233) is threadedly connected to the second threaded rod (231); one end of the second limiting rod (232) is fixed to one end of the side of the clamping frame (221) connection, one end of the second threaded rod (231) is rotationally connected to the other end of the side of the clamping frame (221). 3. The injection needle tip penetration force tester according to claim 2, characterized in that: the limiting member (23) further includes a knob (234), and one side of the knob (234) is fixedly connected to the second needle tip. The other end of the threaded rod (231). 4. The injection needle tip penetration force tester according to claim 1 or 2, characterized in that: the clamping member (22) further includes two levers (225), one of which is the lever (225). The side of the first clamping block (2241) is fixedly connected, and the other lever (225) is fixedly connected to the side of the second clamping block (2242). 5. The injection needle tip penetration force tester according to claim 1 or 2, characterized in that: the driving member (21) includes a motor (211), a first threaded rod (212) and a threaded slider (213) , the output end of the motor (211) is fixedly connected to the first threaded rod (212), the threaded slider (213) is sleeved on the first threaded rod (212), the threaded slider (213) is threadedly connected to the first threaded rod (212), and the upper surface of the threaded slider (213) is fixedly connected to the lower surface of the clamping frame (221). 6. The injection needle tip penetration force tester according to claim 5, characterized in that: the driving member (21) also includes two first limiting rods (214) and two limiting slide blocks (215) and the fixed block (216). The axes of the two first limiting rods (214) are parallel to the axes of the first threaded rod (212). Both sides of the two first limiting rods (214) The ends are respectively fixedly connected to the body (1) through the fixed blocks (216); the two limiting slide blocks (215) are respectively sleeved on the two first limiting rods (214), and the two limiting slide blocks (215) are respectively sleeved on the two first limiting rods (214). The two limiting slide blocks (215) are respectively located on both sides of the clamping frame (221), and the two limiting slide blocks (215) are fixedly connected to the clamping frame (221). 7. The injection needle tip penetration force tester according to claim 1 or 2, characterized in that: the sample fixing part (3) includes a fixing frame (31), a fixing part (32) and an adjusting part (33), The fixing part (32) includes a pressure plate (321), a bottom plate (322), two second guide rods (323), a connecting plate (324) and a pressure spring (325). The lower surface of the bottom plate (322) is fixedly connected. On the upper surface of the fixed frame (31), two second guide rods (323) are arranged in parallel; the lower end of one second guide rod (323) passes through one end of the bottom plate (322) and through all The fixed frame (31) is fixedly connected to the upper surface of the connecting plate (324), and the upper end is fixedly connected to one end of the lower surface of the pressure plate (321); the lower end of the pressure spring (325) is fixedly connected to the connecting plate (324) The upper surface and the upper end are fixedly connected to the fixed frame (31); the lower surface of the connecting plate (324) is connected to the adjusting member (33). 8. The injection needle tip penetration force tester according to claim 7, characterized in that: the adjustment member (33) includes a pressure rod (331), a connecting block (332), a first slide block, and an adjustment plate (333). ) and the second slider, the lower end of the pressure rod (331) passes through the upper surface of the fixed frame (31) and is fixedly connected to the upper surface of the connecting block (332). The lower surface of the connecting block (332) is provided with The first chute is adapted to the upper end of the first slider. The side of the first slider is hinged to one end of the adjustment plate (333). The middle part of the adjustment plate (333) is connected to the fixed frame (333). 31) Rotating connection, the other end of the adjusting plate (333) is hinged with the side of the second slider; the lower surface of the connecting plate (324) is provided with a chute that matches the upper end of the second slider.