A wire rolling feeding and discharging device

By introducing a movable workpiece placement unit and a robot into the thread rolling loading and unloading equipment, combined with a sliding assembly and a cleaning plate, the problem of tool idleness in thread rolling is solved, achieving efficient workpiece processing and coolant recovery, thus improving production efficiency and environmental cleanliness.

CN224463624UActive Publication Date: 2026-07-07CHONGQING STANDARD FASTNERS IND CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
CHONGQING STANDARD FASTNERS IND CO LTD
Filing Date
2025-07-21
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

When thread rolling large bolts, the thread rolling tool is idle during the process of replacing the bolt after processing and before processing, which leads to a longer processing cycle and low efficiency.

Method used

The system employs first and second workpiece moving and placing units that can extend into the processing position, combined with first and second robotic arms. Through horizontal sliding components and overhead rail sliding units, it achieves rapid workpiece loading and unloading and cyclic processing, ensuring uninterrupted processing. Pneumatic telescopic rods and telescopic cylinders are used for workpiece positioning and movement, and a cleaning plate is used to recover coolant.

Benefits of technology

It improves workpiece processing efficiency, reduces the duration of a single processing cycle, lowers processing costs, and maintains a clean processing environment and high coolant recovery rate.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to workpiece processing field, specifically disclose a kind of thread rolling feeding and discharging equipment, including installation box, still include: the first workpiece mobile placement unit of being able to extend into processing position;Second workpiece mobile placement unit can extend into processing position, first workpiece mobile placement unit and second workpiece mobile placement unit can be horizontally slid and installed on installation box;First manipulator can take and place workpiece, first manipulator can be opposite with the first workpiece mobile placement unit or second workpiece mobile placement unit located outside processing position;Second manipulator can take and place workpiece, second manipulator can be opposite with the first workpiece mobile placement unit or second workpiece mobile placement unit located outside processing position.In the scheme, first workpiece mobile placement unit and second workpiece mobile placement unit can be matched with first manipulator and second manipulator, to speed up the taking and placing cycle of workpiece, reduce the time length of single processing beat, reduce processing cost.
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Description

Technical Field

[0001] This utility model relates to the field of workpiece processing technology, and in particular to a thread rolling loading and unloading device. Background Technology

[0002] Thread rolling is a highly efficient and energy-saving cold forming process, especially suitable for the mass production of threaded parts. Its non-cutting characteristics not only improve material utilization but also significantly enhance the mechanical properties of the workpiece. Currently, large-diameter bolts are heavy and bulky, and manual handling and clamping are time-consuming, especially in high-temperature environments, increasing single-piece processing time, reducing equipment utilization, and resulting in high labor costs.

[0003] Currently, in the common process of loading and unloading large-size bolts, a single feed trough is often used. After a single large-size bolt is fed into the thread rolling tool, the feed trough is either supported in its original position or moved back to the processing position. After the thread rolling is completed, the feed trough re-enters the processing position or directly removes the thread-rolled large-size bolt. The feed trough then moves back to convey the processed large-size bolt, and then conveys a new large-size bolt to be processed. During the replacement of processed and unprocessed large-size bolts, the thread rolling tool is idle, which leads to a longer thread rolling cycle and lower processing efficiency. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a thread rolling loading and unloading device to solve the problem that the thread rolling tool is idle during the replacement of processed large-size bolts and bolts to be processed, which leads to an extended thread rolling cycle time.

[0005] To achieve the above objectives, the basic solution of this utility model is as follows: A thread rolling loading and unloading device, including a mounting box, and further comprising:

[0006] A first workpiece moving and placing unit that can extend into the processing position;

[0007] A second workpiece moving and placing unit that can extend into the processing position; both the first workpiece moving and placing unit and the second workpiece moving and placing unit can be horizontally slidably mounted on the mounting box.

[0008] A first robotic arm capable of picking up and placing workpieces, which may be opposite to a first workpiece moving and placing unit or a second workpiece moving and placing unit located outside the processing position;

[0009] A second robotic arm capable of picking up and placing workpieces, which may be opposite to a first workpiece moving and placing unit or a second workpiece moving and placing unit located outside the processing position;

[0010] When the first workpiece moving and placing unit is located at the processing position, and the second workpiece moving and placing unit is located outside the processing position, the first robot arm removes the processed workpiece, and the second robot arm places the workpiece to be processed onto the second workpiece moving and placing unit. Alternatively, when the second workpiece moving and placing unit is located at the processing position, and the first workpiece moving and placing unit is located outside the processing position, the first robot arm removes the processed workpiece, and the second robot arm places the workpiece to be processed onto the first workpiece moving and placing unit.

[0011] The technical principle of this utility model is as follows: the first workpiece moving and placing unit and the second workpiece moving and placing unit can be matched with the first robot and the second robot to speed up the workpiece picking and placing cycle; at the same time, since the first workpiece moving and placing unit and the second workpiece moving and placing unit can be horizontally slidably installed on the mounting box, the first workpiece moving and placing unit and the second workpiece moving and placing unit are continuously aligned with the processing position, so that there is no idle workpiece processing at the processing position, which can improve the processing efficiency of the workpiece, reduce the time of a single processing cycle, and reduce the processing cost.

[0012] Furthermore, it also includes a horizontal sliding assembly for controlling the horizontal sliding of the first workpiece moving and placing unit and the second workpiece moving and placing unit, the horizontal sliding assembly comprising:

[0013] The first slide rail is horizontally and fixedly installed inside the mounting box;

[0014] The first slider, and the first slider sliding control are installed on the first slide rail;

[0015] The first support rod is vertically arranged, and its lower end is fixedly connected to the first slider.

[0016] The second support rod is vertically arranged, and its lower end is fixedly connected to the first slider. The top surface of the mounting box is provided with an opening for the first and second support rods to pass through and slide horizontally. The upper end of the first support rod is fixedly connected to the first workpiece moving and placing unit, and the upper end of the second support rod is fixedly connected to the second workpiece moving and placing unit.

[0017] With the above configuration, the first support rod or the second support rod can support the first workpiece moving and placing unit or the second workpiece moving and placing unit respectively, so that when the first slider moves along the first slide rail, it can simultaneously drive the first workpiece moving and placing unit and the second workpiece moving and placing unit to face each other, thereby facilitating the first workpiece moving and placing unit and the second workpiece moving and placing unit to face the processing position in sequence, and improving the thread rolling efficiency of the workpiece.

[0018] Furthermore, both the first workpiece moving and placing unit and the second workpiece moving and placing unit include the following:

[0019] The first mounting bracket is horizontally fixed on the top of the first support rod or the second support rod, and the distance between the end of the first mounting bracket near the first support rod or the second support rod and the processing position is greater than the length of the workpiece.

[0020] The second mounting bracket is horizontally slidably mounted on the first mounting bracket. The first mounting bracket is equipped with a second slide rail that slides in contact with the lower side of the second mounting bracket. The second mounting bracket is provided with a limiting groove for horizontal placement of the workpiece.

[0021] The telescopic cylinder is fixedly installed on the side of the first mounting frame away from the second mounting frame. The telescopic end of the telescopic cylinder passes through the first mounting frame and is fixedly connected to the side wall of the second mounting frame. The axes of the telescopic cylinder, the second slide rail, and the limiting groove are all perpendicular to the axis of the first slide rail. The second mounting frame can be moved to the processing position.

[0022] With the above settings, when thread rolling is performed, the workpiece to be threaded is placed in the limiting groove, and the telescopic cylinder is controlled to extend. The telescopic cylinder pushes the second mounting frame to move along the first mounting frame and the second slide rail to the processing position. At this time, the workpiece to be processed is directly opposite the thread rolling cutter in the thread rolling device and is clamped and positioned, so that the thread rolling process can be performed on the workpiece to be processed. After processing is completed, the telescopic cylinder retracts, and the second mounting frame moves back to the first mounting frame under the limit of the second slide rail. The processed workpiece is removed, and then the workpiece to be processed is placed on top. The workpiece moves stably under the action of the second mounting frame, the second slide rail and the telescopic cylinder.

[0023] Furthermore, both the first and second support rods are pneumatic telescopic rods.

[0024] With the above settings, when picking up or placing workpieces, the first support rod or the second support rod can be raised first, so that the first workpiece moving and placing unit or the second workpiece moving and placing unit can cooperate with the first robot and the second robot to facilitate the picking up and placing of workpieces without interfering with the workpieces that are undergoing thread rolling.

[0025] Furthermore, it also includes a rail sliding unit, which comprises:

[0026] Hanging rails;

[0027] The second slider, whose sliding control is installed on the hanging rail;

[0028] The telescopic arm is fixedly installed between the second slider and the first or second robotic arm.

[0029] With the above configuration, the second slider can cooperate with the hanging rail to drive the telescopic arm, the first robot arm and the second robot arm to move, so that the first robot arm and the second robot arm can accurately align with the workpiece and accurately pick up and put it in place.

[0030] Furthermore, the center-to-center distance between the first robotic arm and the second robotic arm is equal to the center-to-center distance between the first workpiece moving and placing unit and the second workpiece moving and placing unit.

[0031] The above settings ensure that the thread rolling process of the workpieces at the first or second workpiece moving and placing unit is not affected when the workpieces are picked up and placed.

[0032] Furthermore, it also includes a cleaning plate that can receive coolant. One side of the cleaning plate is detachably installed on the side of the mounting box near the opening. The cleaning plate is opposite to the first workpiece moving and placing unit and the second workpiece moving and placing unit. The other side of the cleaning plate extends towards the processing position, and the cleaning plate is provided with a flow guiding groove. A return flow hole communicating with the flow guiding groove is provided on the side of the cleaning plate away from the mounting box.

[0033] With the above settings, during the process of the workpiece being rolled back to the first mounting bracket, the workpiece will carry some adhering coolant. At this time, the cleaning fluid adhering to the workpiece can flow naturally to the cleaning plate. The guide lines in the guide groove and return flow hole can flow back to the rolling device, preventing the cleaning fluid from adhering and falling between the rolling device and the mounting box, making the environment cleaner and improving the recovery rate of the cleaning fluid. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the axial side structure of a thread rolling loading and unloading device in use according to an embodiment of the present invention.

[0035] Figure 2 This is a longitudinal sectional view of the mounting box in a thread rolling loading and unloading device according to an embodiment of the present utility model.

[0036] In the above-mentioned attached figures: mounting box 10, opening 101, caster wheel 102, cleaning plate 20, guide groove 201, return flow hole 202, first robot arm 301, second robot arm 302, telescopic arm 303, lifting rail 304, second slider 305, first slider 40, first slide rail 401, first support rod 402, second support rod 403, first mounting bracket 501, second slide rail 502, second mounting bracket 503, limiting groove 504, telescopic cylinder 505, thread rolling device 60, workpiece 70. Detailed Implementation

[0037] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0038] This embodiment is basically as follows: Figure 1 and Figure 2As shown, this utility model embodiment proposes a thread rolling loading and unloading device, including a mounting box 10, a cleaning plate 20 for receiving coolant, a first workpiece moving and placing unit that can extend into the processing position, a second workpiece moving and placing unit that can extend into the processing position, a first robotic arm 301 for picking up and placing workpieces 70, a second robotic arm 302 for picking up and placing workpieces 70, a horizontal sliding assembly for controlling the horizontal sliding of the first and second workpiece moving and placing units, and a sliding unit with a hanging rail 304; Figure 1 As shown, the first robot arm 301 can be opposite to the first workpiece moving and placing unit or the second workpiece moving and placing unit located outside the processing position; the second robot arm 302 can be opposite to the first workpiece moving and placing unit or the second workpiece moving and placing unit located outside the processing position.

[0039] Specifically, when the first workpiece moving and placing unit is located at the processing position and the second workpiece moving and placing unit is located outside the processing position, the first robot arm 301 removes the processed workpiece 70, and the second robot arm 302 places the workpiece 70 to be processed onto the second workpiece moving and placing unit; or, the second robot arm 302 removes the processed workpiece 70, and the first robot arm 301 places the workpiece 70 to be processed onto the second workpiece moving and placing unit. When the second workpiece moving and placing unit is located at the processing position and the first workpiece moving and placing unit is located outside the processing position, the first robot arm 301 removes the processed workpiece 70, and the second robot arm 302 places the workpiece 70 to be processed onto the first workpiece moving and placing unit; or, the second robot arm 302 removes the processed workpiece 70, and the first robot arm 301 places the workpiece 70 to be processed onto the first workpiece moving and placing unit.

[0040] like Figure 1 and Figure 2 As shown, the horizontal sliding assembly includes a first slide rail 401, a first slider 40, a first support rod 402, and a second support rod 403. The first slide rail 401 is horizontally fixed in the mounting box 10 by bolts, and the first slider 40 is slidably mounted on the first slide rail 401. The first support rod 402 and the second support rod 403 are both vertically arranged. The lower end of the first support rod 402 is fixedly connected to the left end of the first slider 40 by bolts. The lower end of the second support rod 403 is fixedly connected to the right end of the first slider 40 by bolts. Meanwhile, the top surface of the mounting box 10 is provided with an opening 101 for the first support rod 402 and the second support rod 403 to pass through and slide horizontally. At the same time, the first support rod 402 and the second support rod 403 are both pneumatic telescopic rods.

[0041] like Figure 1As shown, the first workpiece moving and placing unit and the second workpiece moving and placing unit are the same, both including a first mounting frame 501, a second mounting frame 503, and a telescopic cylinder 505. Both the first mounting frame 501 and the second mounting frame 503 are L-shaped steel frames. In the first workpiece moving and placing unit, the first mounting frame 501 is horizontally fixed to the top of the first support rod 402 by bolts, and in the second workpiece moving and placing unit, the first mounting frame 501 is horizontally fixed to the top of the second support rod 403 by bolts. The distance between the end of the first mounting frame 501 near the first support rod 402 or the second support rod 403 and the processing position is greater than the length of the workpiece 70. The second mounting frame 503 is horizontally slidably mounted on the first mounting frame 501. The first mounting frame 501 is equipped with a telescopic cylinder 505. The second slide rail 502 slides in contact with the lower side of the mounting bracket 503. The second mounting bracket 503 is provided with a limiting groove 504 for horizontal placement of the workpiece 70. The longitudinal section profile of the limiting groove 504 is "V" shaped. The lower side of the workpiece 70 can abut against the inner wall of the limiting groove 504. Two-thirds of the thickness of the workpiece 70 is located outside the limiting groove 504, which facilitates contact with the thread rolling cutter for thread rolling. At the same time, the telescopic cylinder 505 is fixedly installed on the front side of the first mounting bracket 501 by bolts. The telescopic end of the telescopic cylinder 505 passes through the first mounting bracket 501 and is fixedly connected to the front side of the second mounting bracket 503 by bolts. The axes of the telescopic cylinder 505, the second slide rail 502 and the limiting groove 504 are all perpendicular to the axis of the first slide rail 401. The second mounting bracket 503 can be moved to the processing position.

[0042] like Figure 1 As shown, the sliding unit of the hanging rail 304 includes a hanging rail 304, a second slider 305, and a telescopic arm 303. The second slider 305 is slidably mounted on the hanging rail 304. The telescopic arm 303 is a hydraulic arm, which is fixedly mounted between the second slider 305 and the first robot arm 301 or the second robot arm 302 by bolts. The center distance between the first robot arm 301 and the second robot arm 302 is equal to the center distance between the first workpiece moving and placing unit and the second workpiece moving and placing unit.

[0043] like Figure 1 As shown, the front side of the cleaning plate 20 is snapped onto the rear side of the mounting box 10. The cleaning plate 20 can rest against the inlet of the thread rolling device. The cleaning plate 20 is opposite to the first workpiece moving and placing unit and the second workpiece moving and placing unit. The other side of the cleaning plate 20 extends towards the processing position and is located inside the thread rolling device. The cleaning plate 20 is provided with a guide groove 201. The front side of the cleaning plate 20 is vertically provided with a return flow hole 202 that communicates with the guide groove 201. The return flow hole 202 also communicates with the inside of the thread rolling device.

[0044] In addition, four lockable casters 102 are installed on the lower surface of the mounting box 10, which facilitates moving the entire mounting box 10 according to the position of the thread rolling device, and also facilitates its use in conjunction with thread rolling devices of different specifications.

[0045] In this embodiment, when the thread rolling loading and unloading equipment is in use, if the second mounting bracket 503 of the second workpiece moving and placing unit is located at the processing position of the thread rolling device supporting the workpiece 70 for thread rolling, a certain workpiece 70 to be processed is clamped by the first robotic arm 301 or the second robotic arm 302. Then, the telescopic arm 303, through the cooperation of the second slider 305 and the hanging rail 304, moves the first robotic arm 301 or the second robotic arm 302 carrying the workpiece 70 to be processed to the first workpiece moving and placing unit, so that the workpiece 70 to be processed is directly facing the first workpiece moving and placing unit. At this time, the first workpiece moving and placing unit... When the telescopic cylinder 505 on the unit is in a retracted state, the second mounting bracket 503 is located on the far left of the first mounting bracket 501, so that the limiting groove 504 of the second mounting bracket 503 is directly opposite the workpiece 70 to be processed. The telescopic arm 303 extends, and the first robot arm 301 and the second robot arm 302 are controlled to move down synchronously. When the vertical distance between the first robot arm 301 and the second robot arm 302 and the second mounting bracket 503 is short, the first robot arm 301 and the second robot arm 302 are controlled to relax, so that the workpiece 70 to be processed is transferred into the limiting groove 504 of the second mounting bracket 503 of the first workpiece moving and placing unit.

[0046] Then, the telescopic arm 303 extends and retracts, controlling the first robotic arm 301 and the second robotic arm 302 to move upwards; when the workpiece 70 in the second workpiece moving and placing unit completes the thread rolling, the completed workpiece 70 automatically falls back into the limiting groove 504 of the second mounting frame 503 in the second workpiece moving and placing unit. At this time, the telescopic cylinder 505 starts to retract, and the second mounting frame 503 moves back to the first mounting frame 501 under the limit of the second slide rail 502; at this time, the processing position of the thread rolling device is idle, and then the first slider 40 in the mounting box 10 starts to move horizontally along the first slide rail 401, and then the first slide rail 401 controls the first support rod 402 and the second support rod 403 to move horizontally, so that the first workpiece moving and placing unit and the second workpiece moving and placing unit move synchronously. At this time, the first workpiece moving and placing unit is adjusted. Once the workpiece is in a position relative to the processing position, the telescopic end of the telescopic cylinder 505 in the first workpiece moving and placing unit can be extended. The telescopic cylinder 505 pushes the second mounting bracket 503 to move along the first mounting bracket 501 and the second slide rail 502 to the processing position. At this time, the workpiece 70 to be processed is directly opposite the thread rolling cutter in the thread rolling device and is clamped and positioned, so that the thread rolling processing of the workpiece 70 to be processed can be performed. At the same time, the second slider 305 controls the telescopic arm 303, the first robot arm 301 and the second robot arm 302 to move along the hanging rail 304 again, so that the first robot arm 301 or the second robot arm 302 is directly opposite the workpiece 70 after processing in the second workpiece moving and placing unit. The telescopic arm 303 controls the first robot arm 301 or the second robot arm 302 to move down to clamp and transfer the processed workpiece 70.

[0047] Then, the above processing cycle can be repeated. During the thread rolling process of workpiece 70, the first workpiece moving and placing unit and the second workpiece moving and placing unit can be matched with the first robot 301 and the second robot 302 to speed up the picking and placing cycle of workpiece 70. At the same time, they can cooperate with the first slide rail 401 and the first slider 40 to ensure that the first workpiece moving and placing unit and the second workpiece moving and placing unit are continuously aligned with the processing position, so that there is no idle workpiece 70 at the processing position, which can improve the processing efficiency of workpiece 70, reduce the duration of a single processing cycle, and reduce processing costs.

[0048] Meanwhile, during the process of the workpiece 70 being rolled and moved back to the first mounting bracket 501, the workpiece 70 will carry some adhering coolant. At this time, the cleaning fluid adhering to the workpiece 70 can flow naturally to the cleaning plate 20. The guide lines of the guide groove 201 and the return flow hole 202 can flow back to the rolling device, preventing the cleaning fluid from adhering and falling between the rolling device and the mounting box 10, making the environment cleaner and improving the recovery rate of the cleaning fluid.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A thread rolling unloading device, comprising a mounting box, characterized in that, Also includes: A first workpiece moving and placing unit that can extend into the processing position; A second workpiece moving and placing unit that can extend into the processing position; both the first workpiece moving and placing unit and the second workpiece moving and placing unit can be horizontally slidably mounted on the mounting box. A first robotic arm capable of picking up and placing workpieces, which may be opposite to a first workpiece moving and placing unit or a second workpiece moving and placing unit located outside the processing position; A second robotic arm capable of picking up and placing workpieces, which may be opposite to a first workpiece moving and placing unit or a second workpiece moving and placing unit located outside the processing position; When the first workpiece moving and placing unit is located at the processing position, and the second workpiece moving and placing unit is located outside the processing position, the first robot arm removes the processed workpiece, and the second robot arm places the workpiece to be processed onto the second workpiece moving and placing unit. Alternatively, when the second workpiece moving and placing unit is located at the processing position, and the first workpiece moving and placing unit is located outside the processing position, the first robot arm removes the processed workpiece, and the second robot arm places the workpiece to be processed onto the first workpiece moving and placing unit.

2. The thread rolling loading and unloading equipment as described in claim 1, characterized in that, It also includes a horizontal sliding assembly for controlling the horizontal sliding of the first workpiece moving and placing unit and the second workpiece moving and placing unit, the horizontal sliding assembly comprising: The first slide rail is horizontally and fixedly installed inside the mounting box; A first slider, the sliding control of the first slider is mounted on a first slide rail; The first support rod is vertically arranged, and its lower end is fixedly connected to the first slider. The second support rod is vertically arranged, and its lower end is fixedly connected to the first slider. The top surface of the mounting box is provided with an opening through which the first support rod and the second support rod can slide horizontally. The upper end of the first support rod is fixedly connected to the first workpiece moving and placing unit, and the upper end of the second support rod is fixedly connected to the second workpiece moving and placing unit.

3. The thread rolling loading and unloading equipment as described in claim 2, characterized in that, The first workpiece moving and placing unit and the second workpiece moving and placing unit both include: The first mounting bracket is horizontally fixedly installed on the top of the first support rod or the second support rod, and the distance between the end of the first mounting bracket near the first support rod or the second support rod and the processing position is greater than the length of the workpiece. The second mounting bracket is horizontally slidably mounted on the first mounting bracket. The first mounting bracket is equipped with a second slide rail that slides in contact with the lower side of the second mounting bracket. The second mounting bracket is provided with a limiting groove for horizontal placement of the workpiece. A telescopic cylinder is fixedly installed on the side of the first mounting frame away from the second mounting frame. The telescopic end of the telescopic cylinder passes through the first mounting frame and is fixedly connected to the side wall of the second mounting frame. The axes of the telescopic cylinder, the second slide rail, and the limiting groove are all perpendicular to the axis of the first slide rail. The second mounting frame can be moved to the processing position.

4. The thread rolling loading and unloading equipment as described in claim 3, characterized in that, Both the first support rod and the second support rod are pneumatic telescopic rods.

5. A thread rolling loading and unloading device as described in any one of claims 1-4, characterized in that, It also includes a rail sliding unit, which comprises: Hanging rails; The second slider, the sliding control of the second slider is installed on the hanging rail; A telescopic arm is fixedly installed between the second slider and the first or second robotic arm.

6. The thread rolling loading and unloading equipment as described in claim 5, characterized in that, The center-to-center distance between the first robotic arm and the second robotic arm is equal to the center-to-center distance between the first workpiece moving and placing unit and the second workpiece moving and placing unit.

7. The thread rolling loading and unloading equipment as described in claim 1, characterized in that, It also includes a cleaning plate that can receive coolant. One side of the cleaning plate is detachably installed on the side of the mounting box near the opening. The cleaning plate is opposite to the first workpiece moving and placing unit and the second workpiece moving and placing unit. The other side of the cleaning plate extends toward the processing position, and the cleaning plate is provided with a flow guide groove. The side of the cleaning plate away from the mounting box is provided with a return flow hole that communicates with the flow guide groove.