Shaft penetrating and pulling mechanism

Abstract

The utility model discloses a shaft penetrating and pulling mechanism, and belongs to the field of coiled material processing. Comprising a rack; the penetrating and pulling mechanism is arranged on the machine frame and comprises a support installed on the machine frame, a clamping part used for clamping and driving a shaft piece to move is arranged on one side of the support, and a lifting part used for driving the clamping part to ascend and descend in the vertical direction is arranged on the support. A connecting part used for connecting the clamping part and a subsequent moving structure is installed on the lifting part, a moving part used for driving the clamping part to move is arranged on the lifting part, a supporting cover is arranged on the side face of the lifting part, and multiple sets of supporting assemblies distributed at intervals in the horizontal direction are installed on the inner wall of the supporting cover and used for stably supporting the shaft piece in the shaft piece inserting and pulling process. According to the shaft penetrating and pulling mechanism, the three-jaw chuck is flexibly matched with shafts with different diameters and stably clamps the shafts, the adjustable double supporting wheels of the supporting assembly are matched with the shafts, uneven stress is avoided, the coaxiality and precision are guaranteed, the stability is improved, and the shaft penetrating and pulling mechanism is suitable for inserting and pulling of the shafts with various specifications.

Description

Technical Field

[0001] This utility model relates to the field of cardboard box production technology, and in particular to a pull-out shaft mechanism. Background Technology

[0002] In industries such as textiles, printing, and packaging, it is often necessary to process rolled materials (such as cloth rolls, paper rolls, and waterproof membranes). These rolled materials are usually in the form of tubular components with a horizontally positioned shaft (such as a warp beam or reel) running through their center. The shaft not only supports the tubular component but also needs to cooperate with equipment to rotate during the unwinding, rewinding, or transfer of the material. Therefore, the separation (shaft removal) and assembly (shaft insertion) of the shaft from the tubular component are key processes in the production, processing, and recycling of tubular components.

[0003] For example, a shaft insertion and removal mechanism disclosed in CN222312214U includes a frame, a support frame, a lifting drive, a support roller, a clamping member, and a horizontal drive. The lifting drive drives the horizontal height of the support frame so that the clamping member on the support frame is aligned with the shaft. The horizontal drive can drive the clamping member to move to clamp the end of the shaft, and then drive the shaft to move left and right to perform shaft removal or insertion processing on the cylindrical member.

[0004] However, the above-mentioned solution still has certain limitations in practical use. Although the support rollers can lift the shaft and limit its back-and-forth sway, the fixed groove size of the grooves, due to their grooved structure, makes it prone to compatibility issues when adapting to shafts of different specifications. Specifically, when the shaft diameter is smaller than the groove's fit range, the groove cannot stably wrap around and limit the shaft, causing it to easily move back and forth during insertion and removal, leading to a deviation in the coaxiality between the shaft and the cylindrical component, affecting the accuracy of the insertion and removal operation. Conversely, when the shaft diameter is larger than the groove's fit range, the contact area between the groove and the shaft decreases, causing the pressure on the shaft to concentrate in a localized contact area, resulting in uneven force distribution and further affecting the stability and accuracy of shaft insertion and removal. Therefore, a shaft insertion and removal mechanism needs to be designed.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Utility Model Content

[0006] This utility model provides a shaft insertion and extraction mechanism to solve the problem that the fixed size of the support roller groove in the above solution can easily lead to coaxiality deviation and uneven force due to unsuitable diameter when adapting to shafts of different specifications, thus affecting the insertion and extraction accuracy and stability.

[0007] The present invention adopts the following technical solution: a shaft insertion / removal mechanism. It mainly includes a frame; an insertion / removal mechanism disposed on the frame, the insertion / removal mechanism including a bracket mounted on the frame, and a clamping part for clamping and driving the shaft to move on one side of the bracket; a lifting part for driving the clamping part to move vertically on the bracket; a connecting part for connecting the clamping part to a subsequent moving structure mounted on the lifting part; a moving part for driving the clamping part to move on the lifting part; a support cover disposed on the side of the lifting part; and multiple sets of horizontally spaced support components mounted on the inner wall of the support cover for stable support during shaft insertion / removal.

[0008] Furthermore, the support assembly includes a base fixed to the inner wall of the support cover, with parallel slide rails fixed to both sides of the base. Two sets of symmetrically distributed support wheels are slidably mounted on the slide rails. The central axis of the support wheels is supported by a bearing seat, and the bottom of the bearing seat is slidably engaged with the slide rail by a slider.

[0009] Furthermore, a motor three is installed on one side of the base, and the output shaft of the motor three is connected to a horizontally arranged bidirectional lead screw through a coupling. The two ends of the bidirectional lead screw are provided with helical grooves with opposite directions of rotation. The two sets of support wheels are respectively threadedly connected to the two sets of helical grooves of the bidirectional lead screw through threaded sleeves.

[0010] Furthermore, a CCD camera is provided on the top outer side of the support cover, with the CCD camera lens facing the axis of the three-jaw chuck, and the camera moves up and down synchronously with the support cover.

[0011] Furthermore, the clamping part includes a mounting base horizontally disposed on one side of the bracket, and a three-jaw chuck is mounted on the side of the mounting base. The three-jaw chuck has three jaws that can be synchronously extended and retracted radially.

[0012] Furthermore, the lifting unit specifically includes two sets of guide rods that are parallel to each other and fixed at intervals on the bracket. Each set of guide rods is slidably fitted with a movable seat. A carrier plate is horizontally connected between the two sets of movable seats, and the mounting seat of the clamping unit is fixed on the carrier plate.

[0013] Furthermore, the support is provided with a drive unit, which includes a motor fixed on the support. A pulley is fixedly sleeved on the output shaft end of the motor. A pulley is rotatably mounted on the support via a bearing, and a closed belt is wound between the pulley and the pulley. An adjusting seat is fixed on the carrier plate, and the adjusting seat is fixedly connected to one side of the belt. The connecting part includes a horizontally arranged connecting rod, and the adjusting seat is slidably sleeved on the connecting rod. The mounting seat of the clamping part is installed on the bottom surface of the adjusting seat.

[0014] Furthermore, the moving part includes two sets of parallel guide rods, which are horizontally fixed to one side edge of the carrier plate. Each set of guide rods is slidably fitted with a sliding seat. A connecting plate is horizontally connected between the two sets of sliding seats. A guide rod parallel to the guide rods is fixed to the other side of the carrier plate. A sliding seat is slidably fitted to the guide rod. The two ends of the connecting rod are fixedly connected to the connecting plate and the sliding seat, respectively, to form a stable lateral support structure.

[0015] A second motor is fixed on the carrier plate, and a lead screw is fixedly connected to the output end of the second motor. The lead screw is parallel to the guide rod. The connecting plate is provided with a threaded hole that matches the lead screw, and the two are connected by threads.

[0016] The above-mentioned technical solutions adopted in the embodiments of this utility model can achieve the following beneficial effects:

[0017] A shaft insertion / removal mechanism features a three-jaw chuck in the clamping section that can flexibly adapt to shafts of different diameters for stable clamping; a lifting section that raises and lowers the clamping section to accommodate different height requirements; a connecting section that works in conjunction with a moving section that allows the clamping section to move smoothly in the horizontal direction, ensuring the straightness of shaft insertion / removal; and a support cover and multiple internal support components. These support components employ an adjustable-gap double-support wheel structure to dynamically adapt to shafts of different diameters during insertion / removal, providing stable support and limiting, preventing shaft movement and uneven force distribution, ensuring coaxiality and insertion / removal accuracy, improving operational stability and accuracy, and adapting to the insertion / removal operations of various shaft specifications. Attached Figure Description

[0018] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0019] In the attached diagram:

[0020] Figure 1 This is an overall schematic diagram of a through-shaft mechanism according to this application;

[0021] Figure 2 for Figure 1 Exploded view;

[0022] Figure 3 for Figure 2 A partial structural diagram;

[0023] Figure 4 for Figure 3 Exploded view;

[0024] Figure 5for Figure 4 Enlarged view of point A;

[0025] Figure label:

[0026] 1. Frame; 2. Threading / Pulling Mechanism; 21. Bracket; 22. Support Cover; 23. Connecting Part; 231. Connecting Rod; 2311. Adjusting Seat Two; 232. Mounting Seat; 233. Three-Jaw Clamping Plate; 24. Lifting Part; 241. Guide Rod; 242. Movable Seat; 243. Carrier Plate; 244. Motor One; 245. Pulley One; 246. Pulley Two; 247. Belt Body; 248. Adjusting Seat One; 25. Moving Part; 251. Guide Rod One; 252. Sliding Seat One; 253. Connecting Plate; 254. Motor Two; 255. Guide Rod Two; 256. Lead Screw One; 3. Support Assembly; 31. Base; 32. Slide Rail; 33. Support Wheel; 34. Bearing Seat; 35. Slider; 36. Bidirectional Lead Screw; 37. Motor Three; 38. Threaded Sleeve. Detailed Implementation

[0027] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0028] The technical solutions provided by the various embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0029] Reference Figures 1-5 As shown, this utility model embodiment provides a shaft insertion and removal mechanism, including a frame 1, on which a shaft insertion and removal mechanism 2 is mounted. The shaft insertion and removal mechanism 2 includes a bracket 21 fixedly mounted on the frame 1, and a clamping part for clamping and driving the shaft to move is provided on one side of the bracket 21. The clamping part includes a mounting seat 232 horizontally arranged on one side of the bracket 21. A three-jaw chuck 233 is fixedly mounted on the side of the mounting seat 232. The three-jaw chuck 233 is the core clamping component, and its three jaws can synchronously extend and retract radially, which can adapt to shafts of different diameters and achieve stable clamping.

[0030] It should be noted that the three-jaw chuck 233 in this application is prior art, and its principle will not be described in detail here. The three-jaw chuck 233 can flexibly switch working states according to operational needs: when performing a shaft pulling operation, its jaws can accurately align and clamp the exposed end of the shaft; if performing a shaft insertion operation, one end of the shaft can be fixed and clamped on the three-jaw chuck 233 in advance, and the shaft can be driven to move after aligning with the center hole of the cylindrical part, thereby realizing the assembly of the shaft and the cylindrical part.

[0031] The bracket 21 is equipped with a lifting part 24 for driving the clamping part to move up and down in the vertical direction, so as to accommodate shafts or cylindrical parts of different heights. The lifting part 24 specifically includes two sets of guide rods 241 (the guide rods 241 are vertical) that are parallel to each other and fixed at intervals on the bracket 21. Each set of guide rods 241 is slidably fitted with a movable seat 242. A carrier plate 243 is horizontally connected between the two sets of movable seats 242. The mounting seat 232 of the clamping part is fixed on the carrier plate 243. Therefore, the carrier plate 243 can slide stably along the guide rods 241 through the movable seat 242, driving the clamping part to move up and down synchronously.

[0032] To drive the carrier plate 243 to rise and fall, the bracket 21 is also equipped with a corresponding drive unit. This drive unit includes a motor 244 fixed on the bracket 21. A pulley 245 is fixedly sleeved on the end of the output shaft of the motor 244. At the same time, a pulley 246 is rotatably mounted on the bracket 21 via bearings and is in the same vertical line as the pulley 245. A closed belt body 247 is wound between the pulley 245 and the pulley 246. In addition, an adjustment seat 248 is fixed on the carrier plate 243. The adjustment seat 248 is fixedly connected to one side of the belt body 247. When the motor 244 starts, its output shaft drives the pulley 245 to rotate, which is transmitted to the pulley 246 through the belt body 247, causing the belt body 247 to circulate. This, in turn, pulls the carrier plate 243 vertically along the guide rod 241 through the adjustment seat 248, thereby realizing the height adjustment of the clamping part.

[0033] Furthermore, a connecting part 23 is installed on the side of the carrier plate 243 away from the adjusting seat 248, for connecting the clamping part and the subsequent moving structure. The connecting part 23 includes a horizontally arranged connecting rod 231, on which the adjusting seat 2311 is slidably sleeved, and the mounting seat 232 of the clamping part is fixedly installed on the bottom surface of the adjusting seat 2311, so that the mounting seat 232 can be adjusted laterally along the connecting rod 231 with the adjusting seat 2311, thereby improving the alignment flexibility with the shaft.

[0034] To drive the clamping part to move in the front-back direction, the carrier plate 243 is also provided with a moving part 25. The moving part 25 includes two sets of parallel guide rods 251. The two sets of guide rods 251 are horizontally fixed at the position of the carrier plate 243 near one side edge. Each set of guide rods 251 is slidably fitted with a sliding seat 252. The two sets of sliding seats 252 are horizontally connected by a connecting plate 253. At the same time, a guide rod 255 parallel to the guide rod 251 is fixed at the position of the carrier plate 243 near the other side. A sliding seat 255 (not shown in the figure) is slidably fitted on the guide rod 255. The two ends of the connecting rod 231 are fixedly connected to the connecting plate 253 and the sliding seat 2 respectively, forming a stable lateral support structure.

[0035] Therefore, when the connecting rod 231 moves, the sliding seat 252 can slide synchronously along the guide rod 251 and the sliding seat 255 along the guide rod 255, thereby driving the three-jaw chuck 233 of the clamping part to move smoothly along the straight direction of the guide rod, ensuring the straightness of the front and rear adjustment.

[0036] The driving source for the moving part 25 is a second motor 254 fixed on the carrier plate 243. A horizontally arranged lead screw 256 is fixedly connected to the output end of the second motor 254. The lead screw 256 is parallel to the guide rod 251, and the connecting plate 253 has a threaded hole adapted to the lead screw 256; the two are connected by threads. When the second motor 254 starts, the lead screw 256 rotates, driving the connecting plate 253 to slide along the guide rod 251 via threaded transmission. This, in turn, drives the clamping part to move back and forth as a whole via the connecting rod 231, achieving alignment between the three-jaw chuck 233 and the shaft and cylindrical parts.

[0037] Meanwhile, a concave support cover 22 is fixedly connected to the side of the carrier plate 243. The opening of the support cover 22 faces the three-jaw chuck 233 of the clamping part, and the entire cover is placed over the outside of the insertion and removal area of ​​the three-jaw chuck 233 and the shaft, playing a protective and auxiliary support role.

[0038] Multiple sets of horizontally spaced support components 3 are installed on the inner wall of the support cover 22 to provide stable support for the shaft during insertion and removal, preventing the shaft from bending due to its own weight or external force. Each set of support components 3 includes a base 31 fixed to the inner wall of the support cover 22 by bolts or other fasteners. A horizontally arranged slide rail 32 is fixed to each of the two sides of the base 31, and the two slide rails 32 are parallel to each other. Two sets of symmetrically distributed support wheels 33 are slidably installed on the slide rails 32. The central axis of the support wheel 33 is supported by a bearing seat 34. The bottom of the bearing seat 34 is slidably engaged with the slide rail 32 by a slider 35, so that the support wheel 33 can smoothly move closer to or away from the slide rail 32.

[0039] To drive the two sets of support wheels 33 to adjust their spacing synchronously, a motor 37 is fixedly installed on one side of the base 31. The output shaft of the motor 37 is connected to a horizontally arranged double-acting screw 36 via a coupling. The two ends of the double-acting screw 36 have helical grooves with opposite directions of rotation. The two sets of support wheels 33 are threadedly connected to the two sets of helical grooves of the double-acting screw 36 via threaded sleeves 38. When the motor 37 starts, the double-acting screw 36 rotates, driving the two sets of support wheels 33 to move synchronously in opposite directions along the slide rail 32 through the helical grooves with opposite directions of rotation. This allows it to accommodate shafts of different diameters. When a shaft passes between the two sets of support wheels 33, it can be lifted and limited by the support wheels 33, reducing shaking during insertion and removal and improving operational stability.

[0040] In this application, a pressure sensor is embedded at the center of the three-jaw chuck 233. This pressure sensor is used to detect whether one end of the cylindrical part is in close contact with the center of the three-jaw chuck 233 when the part is being pulled. A PLC control system is installed on the frame 1 to control the operation of the above-mentioned equipment.

[0041] Meanwhile, an integrated pressure sensor is embedded in the wheel surface area of ​​the support wheel 33. When the shaft falls between the support wheels 33 and forms effective contact, the pressure sensor detects the contact pressure value in real time and transmits the signal to the PLC control system. The system determines whether the shaft is stably positioned by using a preset pressure threshold, avoiding shaft shaking caused by excessive gap between the support wheels 33 or excessive compression caused by insufficient gap.

[0042] A CCD camera (not shown in the figure) is installed on the top outer side of the support cover 22, with its lens facing the axis of the three-jaw chuck 233. During the synchronous lifting and lowering process of the camera with the support cover 22, the camera identifies the positional deviation between the feature points (such as keyways, chamfers, etc.) at the end of the shaft and the center of the three-jaw chuck 233, and calculates the horizontal offset using image processing algorithms (such as edge detection and template matching). When the deviation between the shaft and the center of the chuck is less than the set value, the PLC control system issues a command to brake the motor 244 of the lifting part 24.

[0043] During the shaft removal operation, the moving part 25 drives the three-jaw chuck 233 to move to the left, and the right end of the shaft gradually enters the center area of ​​the chuck. At this time, the pressure sensor embedded in the center of the chuck monitors the contact pressure between the end face of the shaft and the bottom surface of the chuck in real time. When the pressure value reaches the preset threshold, the system determines that the shaft is fully in place and then triggers the clamping action of the three-jaw chuck 233. After clamping is completed, the moving part 25 drives the chuck to move to the right, and the support wheel 33 rotates synchronously to support the shaft until the shaft is completely separated from the cylindrical part. At this time, the pressure sensor of the support wheel 33 continuously provides feedback on the weight distribution of the shaft to ensure a smooth shaft removal process.

[0044] During the shaft insertion operation, the shaft, which is pre-supported on the support wheel 33, is aligned with the center hole of the cylindrical part via the lifting part 24, and the CCD camera confirms the coaxiality again. After the three-jaw chuck 233 clamps the shaft, the moving part 25 drives the shaft to insert to the left, and the support wheel 33 rotates synchronously with the movement of the shaft and monitors the contact pressure in real time.

[0045] Working principle: The shaft insertion and extraction mechanism is based on the frame 1, with the insertion and extraction mechanism 2 as the execution unit. Through the combination of the clamping part, the lifting part 24, the moving part 25 and the support component 3, the precise insertion and extraction of shafts and cylindrical parts is achieved. The three-jaw chuck 233 of the clamping part is responsible for gripping and releasing the shaft. The lifting part 24 is adapted to shafts / cylindrical parts of different heights. The moving part 25 drives the shaft to move horizontally to complete the insertion and extraction action. The support component 3 supports the shaft during the process. With the help of pressure sensors, CCD cameras and PLC control systems, the operation accuracy and stability are ensured.

[0046] During shaft removal, the lifting unit 24 first moves the support cover 22 and the clamping unit up and down. Simultaneously, the top CCD camera identifies the end features of the shaft (such as keyways and chamfers) and calculates the deviation from the center of the three-jaw chuck 233. When the horizontal offset is less than a threshold, the motor 244 brakes, completing the lifting and positioning. Then, the moving unit 25 drives the three-jaw chuck 233 to the left, and the right end of the shaft enters the center of the chuck. The pressure sensor at the center of the chuck detects that the contact pressure has reached a threshold, determining that the shaft is in place and triggering the three-jaw chuck 233 to clamp. After clamping, the moving unit 25 drives the chuck to the right in the opposite direction. The support wheel 33 rotates and lifts the shaft, and the pressure sensor continuously provides feedback on the weight distribution until the shaft is completely detached from the cylindrical component, completing the shaft removal process.

[0047] Before insertion, the shaft is pre-supported on the support wheel 33, and the pressure sensor on the support wheel 33 detects the shaft's positioning status. The lifting unit 24 is activated, driving the support cover 22 and the shaft to rise and fall. The CCD camera confirms the coaxiality of the shaft and the central hole of the cylindrical component. After alignment, the three-jaw chuck 233 clamps the right end of the shaft, and the moving unit 25 drives the shaft to move to the left and insert it into the cylindrical component. During the process, the support wheel 33 rotates synchronously with the movement of the shaft, and the contact pressure is monitored in real time. When the front end of the shaft disengages from the support wheel 33, the sudden pressure triggers the system to fine-tune the insertion speed until the shaft is fully inserted, completing the insertion process.

[0048] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A pull-through shaft mechanism, characterized by: include Rack (1); The insertion and removal mechanism (2) is provided on the frame (1). The insertion and removal mechanism (2) includes a bracket (21) installed on the frame (1), and a clamping part for clamping and driving the shaft to move is provided on one side of the bracket (21). A lifting part (24) for driving the clamping part to move vertically is provided on the bracket (21). A connecting part (23) for connecting the clamping part and the subsequent moving structure is installed on the lifting part (24). A moving part (25) for driving the clamping part to move is provided on the lifting part (24). A support cover (22) is provided on the side of the lifting part (24). Multiple sets of support components (3) distributed horizontally are installed on the inner wall of the support cover (22) for stable support during the insertion and removal of the shaft.

2. A pass-through shaft mechanism according to claim 1, wherein: The support assembly (3) includes a base (31) fixed to the inner wall of the support cover (22). Parallel slide rails (32) are fixed to both sides of the base (31). Two sets of symmetrically distributed support wheels (33) are slidably mounted on the slide rails (32). The central axis of the support wheel (33) is supported by a bearing seat (34). The bottom of the bearing seat (34) is slidably engaged with the slide rail (32) by a slider (35).

3. A pass-through shaft mechanism according to claim 2, wherein: A motor (37) is installed on one side of the base (31). The output shaft of the motor (37) is connected to a horizontally arranged double-acting screw (36) through a coupling. The two ends of the double-acting screw (36) are provided with helical grooves with opposite directions of rotation. The two sets of support wheels (33) are respectively threaded to the two sets of helical grooves of the double-acting screw (36) through threaded sleeves (38).

4. A pass-through shaft mechanism according to claim 2, wherein: The support wheel (33) has an embedded integrated pressure sensor in its wheel surface area.

5. A push-pull shaft mechanism according to claim 4, wherein: A CCD camera is provided on the top outer side of the support cover (22), with the CCD camera lens facing the axis of the three-jaw chuck (233), and the camera moves up and down synchronously with the support cover (22).

6. A push-pull shaft mechanism according to claim 1, wherein: The clamping part includes a mounting base (232) horizontally disposed on one side of the bracket (21). A three-jaw chuck (233) is mounted on the side of the mounting base (232). The three-jaw chuck (233) has three jaws that can be synchronously extended and retracted radially.

7. A push-pull shaft mechanism according to claim 6, wherein: The lifting part (24) specifically includes two sets of guide rods (241) that are parallel to each other and fixed at intervals on the bracket (21). Each set of guide rods (241) is slidably fitted with a movable seat (242). A carrier plate (243) is horizontally connected between the two sets of movable seats (242). The mounting seat (232) of the clamping part is fixed on the carrier plate (243).

8. A push-pull shaft mechanism according to claim 7, wherein: The bracket (21) is provided with a driving unit, which includes a motor (244) fixed on the bracket (21). A pulley (245) is fixedly sleeved on the output shaft end of the motor (244). A pulley (246) is rotatably mounted on the bracket (21) through a bearing and is located on the same vertical line as the pulley (245). A closed belt body (247) is wound between the pulley (245) and the pulley (246). An adjusting seat (248) is fixed on the carrier plate (243). The adjusting seat (248) is fixedly connected to one side of the belt body (247). The connecting part (23) includes a horizontally arranged connecting rod (231). An adjusting seat (2311) is slidably sleeved on the connecting rod (231). The mounting seat (232) of the clamping part is installed on the bottom surface of the adjusting seat (2311).

9. A push-pull shaft mechanism according to claim 8, wherein: The moving part (25) includes two sets of parallel guide rods (251). The two sets of guide rods (251) are horizontally fixed at the position near one side edge of the carrier plate (243). Each set of guide rods (251) is slidably fitted with a sliding seat (252). A connecting plate (253) is horizontally connected between the two sets of sliding seats (252). The carrier plate (243) is fixed at the position near the other side with a guide rod (255) parallel to the guide rods (251). A sliding seat (255) is slidably fitted on the guide rod (255). The two ends of the connecting rod (231) are fixedly connected to the connecting plate (253) and the sliding seat (255) respectively, forming a stable transverse support structure. A second motor (254) is fixed on the carrier plate (243). A lead screw (256) is fixedly connected to the output end of the second motor (254). The lead screw (256) is parallel to the guide rod (251). The connecting plate (253) is provided with a threaded hole that matches the lead screw (256). The two are connected by threads.

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