Jig assembly for split type backrest

Abstract

The jig assembly comprises an upper support jig and a lower support jig, the upper support jig comprises a first bottom plate, a first clamping mechanism and a first clamping table, the first clamping mechanism and the first clamping table are arranged on the first bottom plate, and the first clamping mechanism is configured to clamp a sliding part to the first clamping table; the lower support jig comprises a second bottom plate, a second clamping mechanism and a second clamping table, the second clamping mechanism and the second clamping table are arranged on the second bottom plate, the second clamping mechanism is configured to clamp the supporting part to the groove wall of the sliding groove to be attached to the second clamping table, the width of the second clamping table is close to the width of the sliding part, and the width of the sliding groove after clamping is matched with the width of the sliding part. According to the jig assembly for the split type backrest, the sliding part and the supporting part are clamped by the jig assembly, and the shapes and sizes of the sliding part and the supporting part before and after cooling can be kept consistent; and the width of the sliding groove is matched with that of the sliding part, and the upper bracket and the lower bracket can be assembled smoothly, so that the product quality is ensured, and the yield is improved.

Description

Technical Field

[0001] This utility model relates to the field of tooling and fixture technology, specifically to a fixture assembly for a split-type backrest. Background Technology

[0002] Office chairs are common seating in office spaces. To facilitate packaging and transportation, the various parts of an office chair are manufactured separately during the production process. For example, the backrest, which supports the user's back, typically includes a mesh frame for upholstering, an upper support for supporting the mesh frame, and a lower support connecting the upper support to the seat base. After the mesh frame, upper support, and lower support are manufactured separately, they are assembled together to form the backrest of the office chair.

[0003] Among them, as attached Figure 1 As shown, the upper support 3 includes four frame connecting parts 310 extending forward. These four frame connecting parts 310 are respectively used to connect the four opposite corners of the mesh frame. The frame connecting parts 310 have connecting holes 311 formed along their left and right sides, and are connected to the mesh frame with screws through these connecting holes 311. The lower support 4 has an overall L-shaped structure, including an upper vertical support part 410 with a recessed vertical groove 411. The upper support 3 also includes a lower plate-shaped sliding part 320, which slides vertically to the support part 410 via the groove 411, thereby causing the upper support 3 to slide up and down relative to the lower support 4, thus adjusting the height of the office chair backrest with a high degree of freedom.

[0004] Existing technology typically uses injection molding to form the upper and lower supports, which then need to cool naturally at room temperature after molding. However, because the internal temperature of the injection molded part is higher than the external temperature during cooling, the upper and lower supports are prone to thermal shrinkage. This can lead to deformation and warping of the sliding and supporting parts after cooling, causing the shape and size of the sliding parts to be incompatible with the groove. Consequently, the upper support cannot be successfully assembled into the lower support, resulting in product defects.

[0005] Therefore, ensuring that the upper and lower supports can be successfully assembled after cooling has become the main problem that needs to be solved. Summary of the Invention

[0006] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a jig assembly for a split backrest, in which a first clamping mechanism clamps the sliding part to a first clamping table, and a second clamping mechanism clamps the supporting part to the groove wall of the slide and fits against the second clamping table, so that the shape and size of the sliding part and the supporting part remain consistent before and after cooling; and the width of the second clamping table is close to the width of the sliding part, so that the width of the slide after cooling matches the width of the sliding part, that is, the sliding part can be smoothly inserted into the slide, and the upper bracket and the lower bracket can be smoothly assembled, thereby ensuring product quality and improving yield.

[0007] The effect of this utility model is achieved as follows:

[0008] This application provides a fixture assembly for a split-type backrest, including an upper support fixture and a lower support fixture. The upper support fixture includes a first base plate and a first clamping mechanism and a first clamping platform disposed on the first base plate. The first clamping platform is configured to support the bottom of a sliding part, and the first clamping mechanism is configured to clamp the sliding part to the first clamping platform. The lower support fixture includes a second base plate and a second clamping mechanism and a second clamping platform disposed on the second base plate. The second clamping platform is configured to support the bottom of a support part, and the second clamping mechanism is configured to clamp the support part to the groove wall of the slide that fits against the second clamping platform. The width of the second clamping platform is close to the width of the sliding part, so that the width of the slide after clamping matches the width of the sliding part.

[0009] Furthermore, the top of the first clamping platform is recessed downwards to form a clamping groove, which is configured to accommodate the sliding part, and the width of the clamping groove is close to the width of the sliding part. This ensures that the shape and size of the sliding part after cooling can fit the clamping groove, that is, the width of the sliding part remains unchanged before and after clamping, ensuring that the sliding part can be smoothly assembled to the support part and guaranteeing product quality.

[0010] Furthermore, the second clamping platform has a boss-shaped structure that is narrower at the top and wider at the bottom, including a clamping part with a narrower upper side. The clamping part is configured to fit against the wall of the slide groove, and the height of the clamping part is close to the thickness of the sliding part. This ensures that the depth of the slide groove matches the thickness of the sliding part, thereby further ensuring that the sliding part can be smoothly assembled into the support part and guaranteeing product quality.

[0011] Furthermore, the top of the first clamping platform is recessed downwards to form a clamping groove, which is configured to accommodate the sliding part, and the depth of the clamping groove is close to the thickness of the sliding part. This ensures that the thickness of the sliding part remains unchanged after cooling, guaranteeing that the sliding part can be smoothly assembled into the support part and ensuring product quality.

[0012] Furthermore, the rear side of the second clamping platform extends upward to form a positioning part, which is configured with a stop support part. This makes the installation and positioning operation of the lower bracket simpler.

[0013] Furthermore, the first clamping mechanism includes a plurality of first vertical clamps, which are configured to press the sliding part downwards to fit against the first clamping table. The first vertical clamps offer simple clamping operation and high clamping efficiency. Moreover, the first vertical clamps provide high positioning accuracy, ensuring that the shape and size of the sliding part meet the requirements after clamping.

[0014] Furthermore, the first clamping mechanism includes four sets of horizontal clamps and a third clamping platform. The horizontal clamps are configured to laterally press the frame connecting parts against the third clamping platform. This ensures that the frame connecting parts remain in position against the third clamping platform during cooling, thus preventing the four frame connecting parts from bending or deforming. This guarantees that the frame connecting parts can be smoothly assembled to the seat's mesh frame, further ensuring product quality.

[0015] Furthermore, the horizontal clamp includes a locking pin, and a locking hole is recessed on the side of the third clamping platform near the locking pin. The locking pin is configured to pass through the connecting hole on the frame connecting part and engage with the locking hole, thereby fixing the frame connecting part and the first base plate relatively. The frame connecting part is restricted by the locking pin, making the clamping effect of the first clamping mechanism on the frame connecting part more stable and further preventing bending deformation of the frame connecting part.

[0016] Furthermore, the second clamping mechanism includes a plurality of second vertical clamps, which are configured to press the support portion downwards to fit against the second clamping table. The second vertical clamps are simple to operate, have high clamping efficiency, and have high positioning accuracy, ensuring that the shape and size of the support portion meet the requirements after clamping.

[0017] Furthermore, the second clamping mechanism includes cylinders symmetrically arranged on the left and right sides of the second clamping platform. The cylinders are configured to drive the push rod to move left and right, and drive the pressure plate on the push rod to press the left and right sides of the support part laterally until they are in contact with the side wall of the second clamping platform. By automatically driving the push rod to slide left and right through the cylinders, and driving the pressure plate on the push rod to press or avoid the support part, manpower is saved, making the clamping operation simple and stable.

[0018] The jig assembly for a split-type backrest provided in this application clamps the sliding part to a first clamping table via a first clamping mechanism. This ensures that the sliding part maintains its shape and size in contact with the first clamping table during cooling, preventing warping and deformation. In other words, the shape and size of the sliding part remain consistent before and after cooling. Furthermore, a second clamping mechanism clamps the support part to the groove wall of the slide, ensuring it conforms to the second clamping table during cooling. This also prevents warping and deformation. The width of the second clamping table is close to the width of the sliding part, ensuring that the width of the slide after cooling matches the width of the sliding part. This allows the sliding part to smoothly engage with the slide, and the upper and lower supports to assemble smoothly, thereby guaranteeing product quality and improving yield. Attached Figure Description

[0019] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the assembly process between the upper and lower supports provided in an embodiment of this application;

[0021] Figure 2 This is a schematic diagram of the connection structure between the upper support and the upper support fixture provided in the embodiments of this application;

[0022] Figure 3 A three-dimensional structural diagram of the upper support after it is clamped in the upper support fixture according to an embodiment of this application;

[0023] Figure 4 A cross-sectional structural schematic diagram of the upper support fixture provided in the embodiments of this application;

[0024] Figure 5 This is a schematic diagram of the connection structure between the upper support and the first clamping stage provided in an embodiment of this application;

[0025] Figure 6 This is a schematic diagram of the connection structure between the lower support and the lower support fixture provided in the embodiments of this application;

[0026] Figure 7 A three-dimensional structural diagram of the lower support after it is clamped in the lower support fixture according to an embodiment of this application;

[0027] Figure 8 A cross-sectional structural schematic diagram of the lower support fixture provided in the embodiments of this application;

[0028] Figure 9 This is a schematic diagram of the connection structure between the lower support and the second clamping stage provided in an embodiment of this application.

[0029] The reference numerals in the attached drawings are as follows: 1-Upper support fixture, 110-First base plate, 120-First clamping platform, 121-Clamping groove, 130-First vertical clamp, 140-Horizontal clamp, 141-Locking pin, 150-Third clamping platform, 151-Locking hole, 2-Lower support fixture, 210-Second base plate, 220-Second clamping platform, 221-Clamping part, 222-Positioning part, 230-Second vertical clamp, 240-Cylinder, 241-Push rod, 242-Pressure plate, 3-Upper support, 310-Frame connecting part, 311-Connecting hole, 320-Sliding part, 4-Lower support, 410-Supporting part, 411-Slide groove. Detailed Implementation

[0030] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings.

[0031] Please refer to the attached document. Figure 1-9 This application provides a fixture assembly for a split-type backrest, including an upper support fixture 1 and a lower support fixture 2. The upper support fixture 1 includes a first base plate 110 and a first clamping mechanism and a first clamping platform 120 disposed on the first base plate 110. The first clamping platform 120 is configured to support the bottom of a sliding part 320, and the first clamping mechanism is configured to clamp the sliding part 320 to the first clamping platform 120. The lower support fixture includes a second base plate 210 and a second clamping mechanism and a second clamping platform 220 disposed on the second base plate 210. The second clamping platform 220 is configured to support the bottom of a support part 410, and the second clamping mechanism is configured to clamp the support part 410 to the groove wall of the sliding groove 411, which is in contact with the second clamping platform 220. The width of the second clamping platform 220 is close to the width of the sliding part 320, so that the width of the sliding groove 411 after clamping matches the width of the sliding part 320.

[0032] In this embodiment, the sliding part 320 is clamped to the first clamping table 120 by the first clamping mechanism, so that the sliding part 320 can maintain its shape and size in contact with the first clamping table 120 during cooling, avoiding warping and deformation of the sliding part 320. That is, the shape and size of the sliding part 320 before and after cooling remain consistent. Furthermore, the support part 410 is clamped to the groove wall of the slide groove 411 in contact with the second clamping table 220 by the second clamping mechanism, so that the support part 410 can also maintain its shape and size in contact with the second clamping table 120 during cooling, making it less prone to warping and deformation. Moreover, the width of the second clamping table 220 is close to the width of the sliding part 320, so that the width of the slide groove 411 after cooling matches the width of the sliding part 320. That is, the sliding part 320 can smoothly fit into the slide groove 411, and the upper bracket 3 and lower bracket 4 can be smoothly assembled, thereby ensuring product quality and improving yield.

[0033] Please refer to the attached document. Figure 4 and attached Figure 5 In some embodiments of this application, the top end of the first clamping stage 120 is recessed downward to form a clamping groove 121, the clamping groove 121 is configured to accommodate the sliding part 320, and the width of the clamping groove 121 is close to the width of the sliding part 320.

[0034] In this embodiment, a clamping groove 121 is formed in the first clamping table 120 to accommodate the sliding part 320. During the clamping of the upper bracket 3 by the upper bracket fixture 1, the sliding part 320 is pressed by the first clamping mechanism to fit the clamping groove 121, so that the shape and size of the sliding part 320 after cooling can fit the clamping groove 121. This not only facilitates positioning and makes the clamping effect of the upper bracket fixture 1 more stable, but also ensures that the width of the clamping groove 121 is close to the width of the sliding part 320, so that the width of the sliding part 320 remains unchanged before and after clamping, ensuring that the sliding part 320 can be smoothly assembled into the support part 410 and ensuring product quality.

[0035] Please refer to the attached document. Figure 8 and attached Figure 9 In some embodiments of this application, the second clamping platform 220 is a boss-shaped structure that is narrow at the top and wide at the bottom, including a clamping part 221 with a narrower upper side. The clamping part 221 is configured to fit against the groove wall of the sliding groove 411, and the height of the clamping part 221 is close to the thickness of the sliding part 320.

[0036] In this embodiment, the groove wall of the slide 411 fits against the protruding clamping part 221 on the second clamping table 220, so that after cooling, the width and depth of the slide 411 can fit against the width and height of the clamping part 221. Furthermore, the height of the clamping part 221 is close to the thickness of the sliding part 320, thereby ensuring that the depth of the slide 411 matches the thickness of the sliding part 320. This further guarantees that the sliding part 320 can be smoothly assembled into the support part 410, ensuring product quality.

[0037] Please refer to the attached document. Figure 4 and attached Figure 5 In some embodiments of this application, the top of the first clamping stage 120 is recessed downward to form a clamping groove 121, the clamping groove 121 is configured to accommodate the sliding part 320, and the depth of the clamping groove 121 is close to the thickness of the sliding part 320.

[0038] In this embodiment, the sliding part 320 is pressed into the fitting clamping groove 121 by the first clamping mechanism, and the depth of the clamping groove 121 is close to the thickness of the sliding part 320, so that the thickness of the sliding part 320 after cooling can remain unchanged, ensuring that the sliding part 320 can be smoothly assembled into the support part 410 and ensuring product quality.

[0039] Specifically, by recessing a clamping groove 121 on the first clamping table 120 to fit the width and depth of the sliding part 320, and by providing a clamping part 221 on the second clamping table 220 to fit the width and height of the sliding part 320, it is ensured that after cooling, the width and depth of the groove 411 fit the width and thickness of the sliding part 320, thereby ensuring that the sliding part 320 can be smoothly assembled to the support part 410, further ensuring the quality of the product.

[0040] Please refer to the attached document. Figure 6 and attached Figure 7 In some embodiments of this application, the rear side of the second clamping stage 220 extends upward to form a positioning part 222, and the positioning part 222 is configured as a stop support part 410.

[0041] In this embodiment, when clamping the lower bracket 4 onto the lower bracket fixture 2, the lower bracket 4 can be placed flat on the front side of the second clamping table 220. After aligning the support part 410 with the second clamping table 220, the lower bracket 4 is pushed in from front to back until the support part 410 is stopped by the positioning part 222, thus completing the installation and positioning operation of the lower bracket 4. Therefore, by stopping the rear end of the support part 410 by the positioning part 222, the installation and positioning operation of the lower bracket 4 is made simpler.

[0042] Please refer to the attached document. Figure 2-4 In some embodiments of this application, the first clamping mechanism includes a plurality of first vertical clamps 130, which are configured to press down on the sliding portion 320 to fit against the first clamping table 120.

[0043] In this embodiment, the first vertical clamp 130 is easy to operate; the user only needs to turn the handle to drive the clamp head downwards to press the sliding part 320, resulting in high clamping efficiency. Furthermore, the first vertical clamp 130 has high positioning accuracy, ensuring that the shape and size of the sliding part 320 meet requirements after clamping. The vertical clamp in this application is a common component in the existing market, and will not be described in detail here.

[0044] Preferably, two first vertical clamps 130 are provided on the left and right sides of the first clamping platform 120. By clamping the sliding part 320 with the two sets of first vertical clamps 130, the clamping effect is more stable and the warping deformation of the sliding part 320 is effectively avoided.

[0045] Of course, in other embodiments of this application, in addition to using a vertical clamp, the first clamping mechanism can also use a cylinder structure, a spiral clamping structure, or other mechanisms to vertically press the sliding part 320.

[0046] Please refer to the attached document. Figure 2 and attached Figure 3 In some embodiments of this application, the first clamping mechanism includes four sets of horizontal clamps 140 and a third clamping platform 150. The horizontal clamps 140 are configured to laterally press the frame connecting portion 310 to fit against the third clamping platform 150.

[0047] In this embodiment, four sets of horizontal clamps 140 and a third clamping platform 150 respectively clamp the four frame connecting parts 310 of the upper bracket 3. This ensures that the frame connecting parts 310 remain in contact with the third clamping platform 150 during the cooling process, preventing the four frame connecting parts 310 from bending or deforming. This guarantees that the frame connecting parts 310 can be smoothly assembled to the mesh frame of the seat, further ensuring product quality. Furthermore, the horizontal clamps 140 are easy to operate; the user only needs to turn the handle to drive the clamp head to laterally press the frame connecting parts 310, resulting in high clamping efficiency. The horizontal clamps 140 also have high positioning accuracy, ensuring that the shape and size of the frame connecting parts 310 meet the requirements after clamping. The horizontal clamps used in this application are common parts in the existing market, and this patent will not elaborate further.

[0048] Of course, in other embodiments of this application, in addition to using horizontal clamps, the first clamping mechanism can also use a cylinder structure, a spiral clamping structure, or other mechanisms to clamp the frame connection part 310 laterally.

[0049] Please refer to the attached document. Figure 2 and attached Figure 3 In some embodiments of this application, the horizontal clamp 140 includes a locking pin 141, and the third clamping platform 150 has a locking hole 151 recessed on the side near the locking pin 141. The locking pin 141 is configured to pass through the connecting hole 311 on the frame connecting part 310 and engage with the locking hole 151, so that the frame connecting part 310 and the first base plate 110 are relatively fixed.

[0050] In this embodiment, the frame connection part 310 is restricted by the locking pin 141. During clamping, it is relatively fixed in both the horizontal and vertical directions relative to the horizontal clamp 140 and the third clamping table 150, thereby making the clamping effect of the first clamping mechanism on the frame connection part 310 more stable and further preventing the frame connection part 310 from bending and deforming.

[0051] Please refer to the attached document. Figure 6-8 In some embodiments of this application, the second clamping mechanism includes a plurality of second vertical clamps 230, which are configured to press the support portion 410 downward to fit against the second clamping table 220.

[0052] In this embodiment, the second vertical clamp 230 is easy to operate; the user only needs to turn the handle to drive the clamp head downwards to press the support part 410, resulting in high clamping efficiency. Furthermore, the second vertical clamp 230 has high positioning accuracy, ensuring that the shape and size of the support part 410 meet the requirements after clamping.

[0053] The second vertical clamp 230 is located on the front side of the second clamping table 220. When the support part 410 is inserted into the second clamping table 220 from front to back, the clamp head of the second vertical clamp 230 rotates downward to press the support part 410.

[0054] Please refer to the attached document. Figure 6-8 In some embodiments of this application, the second clamping mechanism includes cylinders 240 symmetrically arranged on the left and right sides of the second clamping platform 220. The cylinders 240 are configured to drive the push rod 241 to move left and right, and drive the pressure plate 242 on the push rod 241 to press the left and right sides of the support part 410 laterally to fit against the side wall of the second clamping platform 220.

[0055] In this embodiment, the cylinder 240 automatically drives the push rod 241 to slide left and right, and drives the pressure plate 242 on the push rod 241 to press or avoid the support part 410, saving manpower and making the clamping operation simple and stable.

[0056] Of course, in other embodiments of this application, the second clamping mechanism may use a push-pull quick clamp, a spiral clamping structure, or other methods to laterally clamp the support part 410, in addition to using a cylinder.

[0057] It should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used above to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means three or more.

[0058] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A fixture assembly for a split-type backrest, characterized in that, The fixture includes an upper support fixture (1) and a lower support fixture (2). The upper support fixture (1) includes a first base plate (110) and a first clamping mechanism and a first clamping table (120) disposed on the first base plate (110). The first clamping table (120) is configured to support the bottom of the sliding part (320), and the first clamping mechanism is configured to clamp the sliding part (320) to the first clamping table (120). The lower support fixture includes a second base plate (210) and a clamping mechanism disposed on the second base plate. (210) has a second clamping mechanism and a second clamping table (220). The second clamping table (220) is configured to support the bottom of the support part (410). The second clamping mechanism is configured to clamp the support part (410) to the groove wall of the slide (411) and fit the second clamping table (220). The width of the second clamping table (220) is close to the width of the sliding part (320), so that the width of the slide (411) after clamping matches the width of the sliding part (320).

2. The fixture assembly for a split-type backrest according to claim 1, characterized in that, The top of the first clamping table (120) is recessed downward to form a clamping groove (121), the clamping groove (121) is configured to accommodate the sliding part (320), and the width of the clamping groove (121) is close to the width of the sliding part (320).

3. The fixture assembly for a split-type backrest according to claim 1, characterized in that, The second clamping platform (220) is a boss-shaped structure that is narrow at the top and wide at the bottom, including a clamping part (221) with a narrower upper side. The clamping part (221) is configured to fit the groove wall of the sliding groove (411), and the height of the clamping part (221) is close to the thickness of the sliding part (320).

4. The fixture assembly for a split-type backrest according to claim 3, characterized in that, The top of the first clamping stage (120) is recessed downward to form a clamping groove (121), the clamping groove (121) is configured to accommodate the sliding part (320), and the depth of the clamping groove (121) is close to the thickness of the sliding part (320).

5. The fixture assembly for a split-type backrest according to claim 1, characterized in that, The rear side of the second clamping table (220) extends upward to form a positioning part (222), and the positioning part (222) is configured with a stop support part (410).

6. The fixture assembly for a split-type backrest according to claim 1, characterized in that, The first clamping mechanism includes a plurality of first vertical clamps (130), which are configured to press down on the sliding portion (320) to fit against the first clamping table (120).

7. The fixture assembly for a split-type backrest according to claim 1, characterized in that, The first clamping mechanism includes four sets of horizontal clamps (140) and a third clamping platform (150). The horizontal clamps (140) are configured to laterally press the frame connecting part (310) against the third clamping platform (150).

8. The fixture assembly for a split-type backrest according to claim 7, characterized in that, The horizontal clamp (140) includes a locking pin (141), and the third clamping platform (150) has a locking hole (151) recessed on the side near the locking pin (141). The locking pin (141) is configured to pass through the connecting hole (311) on the frame connecting part (310) and engage with the locking hole (151), so that the frame connecting part (310) and the first base plate (110) are relatively fixed.

9. The fixture assembly for a split-type backrest according to claim 1, characterized in that, The second clamping mechanism includes a plurality of second vertical clamps (230), which are configured to press down on the support (410) to fit against the second clamping table (220).

10. The fixture assembly for a split-type backrest according to claim 1, characterized in that, The second clamping mechanism includes cylinders (240) symmetrically arranged on the left and right sides of the second clamping table (220). The cylinders (240) are configured to drive the push rod (241) to move left and right, and drive the pressure plate (242) on the push rod (241) to press the left and right sides of the support part (410) laterally to fit the side wall of the second clamping table (220).

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