Vertical turning and milling composite numerical control machining lathe

Abstract

The invention discloses a vertical turning and milling composite numerical control machining lathe, and relates to the related field of lathes, the vertical turning and milling composite numerical control machining lathe comprises a supporting frame and a machining module movably arranged at the top of the supporting frame, a limiting clamp is movably arranged below the machining module, and a cooling liquid spray pipe is arranged at the front end of the machining module; and an obliquely-downward discharging opening is formed in the position, close to the position under the machining module, of the top of the supporting frame, the bottom of the filtering box communicates with the top of the storage box through a pipeline, and a filtering part is arranged in the filtering box and used for filtering chippings generated during machining. According to the vertical turning and milling composite numerical control machining lathe, in the machining process, cooling liquid is sprayed out through the spraying pipe to cool a machining area and wash away chippings, the discharging mechanism drives a fiber filter screen to rotate downwards by 0-25 degrees through spiral transmission of a twisted rod and a rotating part, and automatic discharging of impurities is achieved; the fixed inflator is matched with the air nozzle, so that the filter screen can be purged and cleaned, and blockage is avoided.

Description

Technical Field

[0001] This invention relates to the field of lathe technology, specifically to a vertical turning-milling composite CNC machining lathe. Background Technology

[0002] In the high-end manufacturing sector, the processing of complex rotating and irregularly shaped structural parts places increasingly higher demands on the precision and efficiency of equipment. Traditional processing methods use CNC vertical lathes, machining centers, and other equipment to complete turning, milling, drilling, boring, and other operations in separate processes. The workpieces need to be clamped and transferred multiple times, which can easily lead to positioning errors. Thin-walled parts may also deform due to clamping forces, making it difficult to guarantee processing accuracy and process stability. At the same time, the production cycle is long and the overall cost is high.

[0003] Existing positioning devices are inconvenient for positioning small or non-circular workpieces, lack convenience, and are prone to wobbling. To address these issues, a positioning device for a milling and turning machine tool disclosed in prior art (Chinese patent application number CN202322043703.X, application date 2023-08-01) can be referenced. This device, through the setting of the positioning mechanism, allows the gear to rotate counterclockwise under the use of a second drive motor when a small or non-circular workpiece needs to be processed, while simultaneously... When the ring is in use, the other meshing gears also rotate counterclockwise, thereby driving the sawtooth plate meshing at one end of the gear to move downward, thus reducing the distance between the fixed plates. This makes it easier to hold the clamping block connected to one end of the fixed plate against the workpiece. The simultaneous movement of the five sets of fixed plates makes it easier to push the workpiece towards the center point, achieving the positioning effect. Alternatively, one can refer to the prior art (Chinese patent application number CN202021324125.7, application date 2020-07-08) which discloses a positioning mechanism for a CNC double-column vertical turning and milling composite lathe. This positioning mechanism makes the connection... As the lever rotates, the rotary wheel fixes the long shaft, protecting it from scratches during advancement and providing a secure hold. After adjustment, the three-jaw chuck further secures the long shaft. Once the lathe is positioned and operation begins, the fixing cylinder rotates with the three-jaw chuck, fixing one end of the long shaft inside. This prevents the shaft's rotation center from shifting, resulting in more precise machining. After milling, rotating the push rod disengages the locking pin from the slider. Adjusting the chuck allows the long shaft to be removed. The long shaft and the bottom magnetic block are attracted by magnetism, which helps move the entire limiting frame to the left. The device performs a reset to achieve an automatic reset effect. Finally, it can be referenced to the prior art (Chinese patent application number CN202420381335.1, application date 2024-02-29) which discloses a workpiece positioning device for a milling and turning composite CNC lathe. When a large workpiece needs to be clamped and positioned, the two lead screws are rotated by the drive of the transmission gear A. The rotation of the lead screws causes the positioning mechanism to move inside the slide groove A, which makes it easier for the operator to position and clamp the large workpiece through the positioning block B, thus improving the applicability of the device.

[0004] Although the above-mentioned devices basically meet the processing and clamping requirements, in actual processing applications, the processing of workpieces will generate a large amount of metal debris. During processing, it is necessary to cool the processing area with coolant and clean the debris generated by processing with the flushing action of coolant. In order to reduce the consumption of coolant and save processing costs, the used coolant needs to be recycled and reused. However, the recycled coolant is mixed with a large amount of impurities such as metal debris. The impurities are complex in composition and high in content, which makes the subsequent recycling and processing of coolant cumbersome and difficult, seriously affecting the efficiency and effectiveness of coolant recycling and reuse.

[0005] Therefore, we propose a vertical turning-milling composite CNC lathe to solve the problems mentioned above. Summary of the Invention

[0006] The purpose of this invention is to provide a vertical milling and turning CNC lathe to solve the problems mentioned in the background art. In actual machining applications, CNC lathes on the market generate a large amount of metal debris during workpiece machining. During machining, coolant is needed to cool the machining area and clean the debris generated by machining using the flushing action of the coolant. To reduce coolant consumption and save machining costs, the used coolant needs to be recycled and reused. However, the recycled coolant contains a large amount of impurities such as metal debris. The impurities are complex in composition and high in content, making the subsequent recycling and processing of the coolant cumbersome and difficult, which seriously affects the efficiency and effectiveness of coolant recycling and reuse.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a vertical milling and turning composite CNC lathe, comprising a support frame and a machining module movably disposed on the top of the support frame. A limiting fixture is movably disposed below the machining module. A coolant spray pipe is disposed at the front end of the machining module. The outer side of the machining module is connected to the vertical moving end of a three-axis adjustment module. The horizontal and vertical moving ends of the three-axis adjustment module act on the bottom of the limiting fixture to adjust its position. The top of the coolant spray pipe is connected to the top of a delivery pipe, and the bottom of the delivery pipe is connected to the bottom of a storage tank via a delivery pump. An inclined downward feeding port is provided on the top of the support frame near the bottom of the machining module. The bottom of the feeding port is connected to the top of a filter box, and the bottom of the filter box is connected to the top of the storage tank via a pipe. A filter section is disposed inside the filter box for filtering the debris generated during machining.

[0008] Preferably, a shield is provided on the outer side of the top of the support frame, and a viewing door and window are movably provided on the inner side of the shield. A control panel is installed on the right surface of the shield, and the control panel is electrically connected to the processing module and the three-axis adjustment module respectively. A liquid replenishment pipe is provided on the outer side of the storage tank, and the storage tank and the filter tank are connected by a liquid drain pipe.

[0009] Preferably, the filtration unit includes a filter screen frame slidably disposed inside the filter box, a pulling member fixed to the outside of the filter screen frame, fiber filter screens rotatably disposed at both ends of the inner side of the filter screen frame, and a discharge mechanism disposed on the bottom outer side of the fiber filter screen; a twisted rod is fixed inside the filter box, and the twisted rod provides power to the rotating part of the discharge mechanism.

[0010] Preferably, the discharge mechanism includes a rotating part rotatably installed inside the filter screen frame. A threaded connecting block is threadedly connected to the outer side of one end of the rotating part. Movable rods are rotatably provided at both ends of the threaded connecting block. The end of the movable rod away from the crossbar is rotatably provided inside the rotating block. The top of the rotating block is fixed to the bottom of the fiber filter screen.

[0011] Preferably, the rotating part includes a rotating cylinder rotatably disposed inside the filter screen frame, one end of the rotating cylinder is fixedly connected to a threaded rod, the outer side of the threaded rod is threadedly connected to the inner side of the threaded connecting block; the inner side of the rotating cylinder is helically connected to the outer side of the twisted rod, and the twisted rod and the rotating cylinder are coaxially arranged.

[0012] Preferably, the fiber filter screen forms a rotating structure with the filter screen frame via a rotating block, and the fiber filter screen rotates downward toward the filter box with a rotation angle range of 0° to -25°.

[0013] Preferably, the fiber filter screens are arranged symmetrically in two sets about the vertical center line of the filter screen frame, and a sealing gasket is provided at the rotatable connection of the movable rod.

[0014] Preferably, a fixed air cylinder is fixed on both the left and right sides of the filter screen frame, and a piston rod extends into the fixed air cylinder. The end of the piston rod away from the fixed air cylinder is fixed inside the filter box. Several sets of air nozzles are connected to one side of the fixed air cylinder through a hose, and the air nozzles are installed on the upper inner side of the filter screen frame.

[0015] Preferably, the air jet is inclinedly disposed inside the filter mesh frame, and the air jet is located on the outer side of the upper end of the fiber filter mesh.

[0016] Preferably, a rubber ring is provided at one end of the piston rod that extends into the fixed air cylinder, and the outer wall of the rubber ring is in contact with the inner wall of the fixed air cylinder; a one-way air inlet is provided at one end of the piston rod, and a one-way air outlet is provided inside the air outlet.

[0017] Compared with the prior art, the beneficial effects of this invention are as follows: In this vertical milling and turning composite CNC machining lathe, during the machining process, coolant is sprayed through a nozzle to cool the machining area and flush away debris. The coolant carrying debris flows into the filter box through the feed port, where it is filtered by a fiber filter screen. Impurities are trapped, and the pure coolant flows back to the storage tank for recycling. Simultaneously, the discharge mechanism, through the helical transmission of a twisted rod and a rotating part, drives the fiber filter screen to rotate downwards from 0° to -25°, achieving automatic discharge of impurities. A fixed air cylinder, in conjunction with the air jet nozzle, can blow and clean the filter screen, preventing clogging. This design significantly simplifies the coolant recovery process, reduces the difficulty of impurity cleaning, improves recovery efficiency, and reduces coolant loss and machining costs. Furthermore, the three-axis adjustment module precisely adjusts the position of the limit fixture to adapt to the machining of workpieces of different specifications. Specific details are as follows: 1. The filter screen frame is slidably connected to the filter box via a pull-out component. Combined with the blowing function of the air jet, the frequency of manual cleaning of the filter screen can be reduced. The fiber filter screen is symmetrically arranged and can rotate to discharge impurities, avoiding the accumulation of impurities that affect the filtration effect. The design of the liquid replenishment pipe and liquid drain pipe in the storage tank facilitates the replenishment and circulation of coolant. The overall structure is compact and reasonable, occupying little space.

[0018] 2. By rotating the fiber filter screen, the fiber filter screen can rotate downwards from 0° to -25°, allowing the debris on the fiber filter screen to fall tilted down to the outside of the filter box for convenient centralized collection and treatment. Furthermore, by pulling the pull part, the filter screen frame can be moved. Through the cooperation of the rotating part and the twisted rod, the waste can be discharged when it is pulled out. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic diagram of the main structure of the feed port of the present invention; Figure 3 This is a schematic diagram of the main structure of the processing module of the present invention; Figure 4 This is a schematic diagram of the main cross-sectional structure of the filter box of the present invention; Figure 5 This is a bottom view of the fiber filter structure of the present invention; Figure 6 This is a schematic diagram of the rear view of the twisted rod structure of the present invention; Figure 7 This is a schematic diagram of the main structure of the rotating part of the present invention; Figure 8 This is a schematic diagram of the main cross-sectional structure of the fixed air cylinder of the present invention; Figure 9 For the present invention Figure 4 Enlarged structural diagram at point A in the middle.

[0020] In the diagram: 1. Support frame; 2. Shielding cover; 3. Control panel; 4. Machining module; 41. Three-axis adjustment module; 5. Limiting fixture; 6. Coolant spray pipe; 7. Infusion pipe; 8. Storage tank; 81. Replenishment pipe; 82. Drain pipe; 9. Discharge port; 10. Filter box; 11. Filter screen frame; 12. Pulling component; 13. Fiber filter screen; 14. Twisted rod; 15. Rotating part; 151. Rotating cylinder; 152. Threaded rod; 16. Threaded connecting block; 17. Crossbar; 18. Movable rod; 19. Rotating block; 20. Fixed air cylinder; 201. One-way air inlet; 21. Piston rod; 22. Air jet nozzle.

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-9 The present invention provides the following technical solution: a vertical turning and milling composite CNC machining lathe.

[0023] Example 1: To address the issue that CNC machining lathes currently on the market generate a large amount of metal debris during workpiece processing, requiring coolant to cool the machining area and clean the debris through flushing, and to reduce coolant consumption and save processing costs, the used coolant needs to be recycled. However, the recycled coolant contains a large amount of impurities such as metal debris, with complex composition and high content, making subsequent coolant recycling processes cumbersome and difficult, severely impacting the efficiency and effectiveness of coolant recycling. (See Appendix for details.) Figure 1 - Appendix Figure 5 The system includes a support frame 1 and a processing module 4 movably mounted on top of the support frame 1. A limiting fixture 5 is movably mounted below the processing module 4. A coolant spray pipe 6 is mounted at the front end of the processing module 4. The outer side of the processing module 4 is connected to the vertical moving end of a three-axis adjustment module 41. The horizontal and vertical moving ends of the three-axis adjustment module 41 act on the bottom of the limiting fixture 5 to adjust its position. The top of the coolant spray pipe 6 is connected to the top of a delivery pipe 7, and the bottom of the delivery pipe 7 is connected to the bottom of a storage tank 8 via a delivery pump. A downwardly sloping discharge port 9 is located on the top of the support frame 1 near the bottom of the processing module 4. The bottom of the discharge port 9 is connected to the top of a filter box 10, and the bottom of the filter box 10 is connected via a delivery pump. The pipe is connected to the top of the storage tank 8. The filter box 10 is equipped with a filter section, which is used to filter the debris generated during processing. The support frame 1 is equipped with a shield 2 on the top outer side. The shield 2 is equipped with a movable viewing door and window. The right surface of the shield 2 is equipped with a control panel 3. The control panel 3 is electrically connected to the processing module 4 and the three-axis adjustment module 41 respectively. The storage tank 8 is equipped with a liquid replenishment pipe 81 on the outside. The storage tank 8 and the filter box 10 are connected by a liquid drain pipe 82. The filter section includes a filter screen frame 11 that is slidably installed inside the filter box 10. A pull member 12 is fixed on the outside of the filter screen frame 11. Fiber filter screens 13 are rotatably installed at both ends of the inner side of the filter screen frame 11.

[0024] Workers observe the processing status through the viewing doors and windows on the shielding cover 2, and send commands to the processing module 4 and the three-axis adjustment module 41 using the control panel 3. The horizontal and vertical moving ends of the three-axis adjustment module 41 act on the bottom of the limit fixture 5 to precisely adjust the position of the limit fixture 5 to adapt to the clamping requirements of workpieces of different specifications. After the liquid pump is started, the coolant in the storage tank 8 is delivered to the coolant spray pipe 6 through the liquid pipe 7. The coolant spray pipe 6 sprays coolant into the processing area to achieve the dual effects of cooling and debris flushing. The coolant carrying metal debris flows into the filter box 10 through the inclined discharge port 9. The coolant passes through the fiber filter screen 13 inside the filter screen frame 11, and the debris is intercepted by the filter screen. The filtered pure coolant flows back to the storage tank 8 through the liquid discharge pipe 82 to complete one cycle. When the coolant level in the storage tank 8 is insufficient, coolant can be added through the liquid replenishment pipe 81.

[0025] Example 2: To facilitate the centralized disposal of excess debris, please refer to the attached document. Figure 4 - Appendix Figure 7 A discharge mechanism is provided on the outer bottom of the fiber filter screen 13; a twisted rod 14 is fixed inside the filter box 10, and the twisted rod 14 provides power to the rotating part 15 of the discharge mechanism; the discharge mechanism includes a rotating part 15 rotatably installed inside the filter screen frame 11, a threaded connecting block 16 is threadedly connected to the outer side of one end of the rotating part 15, and movable rods 18 are rotatably provided at both ends of the threaded connecting block 16. The end of the movable rod 18 away from the crossbar 17 is rotatably provided inside the rotating block 19, and the top of the rotating block 19 is fixed to the bottom of the fiber filter screen 13; the rotating part 15 includes a rotating part rotatably installed inside the filter screen frame 11. The rotating cylinder 151 has a threaded rod 152 fixedly connected to one end, and the outer side of the threaded rod 152 is threadedly connected to the inner side of the threaded connecting block 16. The inner side of the rotating cylinder 151 is spirally connected to the outer side of the twisted rod 14, and the twisted rod 14 and the rotating cylinder 151 are coaxially arranged. The fiber filter screen 13 forms a rotating structure with the filter screen frame 11 through the rotating block 19. The fiber filter screen 13 rotates towards the bottom of the filter box 10, and the rotation angle range is 0° to -25°. Two sets of fiber filter screens 13 are symmetrically arranged about the vertical center line of the filter screen frame 11. A sealing gasket is provided at the rotating connection of the movable rod 18.

[0026] The filter screen frame 11 can be moved under external force by being pulled by the pulling member 12, which in turn drives the internal rotating part 15 to move synchronously. Since the inner side of the rotating cylinder 151 is spirally connected to the outer side of the twisted rod 14, and the twisted rod 14 is fixed inside the filter box 10, the rotating cylinder 151 will rotate along the axis of the twisted rod 14 during the displacement process, and drive the threaded rod 152 at the end to rotate. When the threaded rod 152 rotates, the threaded connecting block 16 connected to it moves laterally along the rod body, pushing the movable rods 18 at both ends to swing. The movable rod 18 drives the fiber filter screen 13 to rotate along the connection point through the rotating block 19. The fiber filter screen 13 rotates towards the bottom of the filter box 10, and the rotation angle is controlled between 0° and -25°. The debris trapped on the filter screen surface falls off under the action of gravity and is discharged in a concentrated manner. The two sets of fiber filter screens 13 are symmetrically distributed and can complete the discharge of debris synchronously. The sealing gasket at the rotating connection of the movable rod 18 can avoid the influence on the rotating part in the later stage.

[0027] Example 3: This example differs from Example 2 in that it primarily provides a mechanism to assist in the falling of debris. Please refer to the attached document. Figure 5 Appendix Figure 6 Appendix Figure 8 and attached Figure 9 The filter screen frame 11 is fixed with fixed air cylinders 20 on both the left and right sides. A piston rod 21 extends into the fixed air cylinder 20. The end of the piston rod 21 away from the fixed air cylinder 20 is fixed inside the filter box 10. Several sets of air nozzles 22 are connected to one side of the fixed air cylinder 20 through a hose. The air nozzles 22 are installed on the upper inner side of the filter screen frame 11. The air nozzles 22 are inclined inside the filter screen frame 11 and are located on the outer side of the upper end of the fiber filter screen 13. A rubber ring is provided at the end of the piston rod 21 that extends into the fixed air cylinder 20. The outer wall of the rubber ring is in contact with the inner wall of the fixed air cylinder 20. A one-way air inlet 201 is provided at one end of the piston rod 21, and a one-way air outlet is provided inside the air nozzle 22.

[0028] When the filter screen frame 11 moves, the fixed air cylinders 20 on the left and right sides move synchronously with the frame, and the piston rod 21 extends and retracts relative to the air cylinder. The rubber ring at one end of the piston rod 21 ensures the air cylinder's sealing. When the piston rod 21 moves, outside air enters the fixed air cylinder 20 through the one-way air inlet 201. The air inside the fixed air cylinder 20 is delivered to the jet nozzle 22 through a hose. The jet nozzle 22 is inclined and set on the outer side of the upper end of the fiber filter screen 13. The high-pressure airflow blows obliquely towards the filter screen surface. The impact force of the airflow can shake off the fine debris adhering to the filter screen surface and help the debris slide off along the rotated filter screen, further improving the debris removal effect. The one-way air outlet in the jet nozzle 22 prevents coolant from flowing back into the air inlet, ensuring the stable operation of the mechanism.

[0029] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A vertical milling and turning composite CNC lathe, comprising a support frame (1) and a machining module (4) movably disposed on the top of the support frame (1), wherein a limiting fixture (5) is movably disposed below the machining module (4), a coolant spray pipe (6) is disposed at the front end of the machining module (4), the outer side of the machining module (4) is connected to the vertical moving end of a three-axis adjustment module (41), and the transverse and longitudinal moving ends of the three-axis adjustment module (41) act on the bottom of the limiting fixture (5) to adjust the position of the limiting fixture (5); characterized in that: The top of the coolant spray pipe (6) is connected to the top of the infusion pipe (7), and the bottom of the infusion pipe (7) is connected to the bottom of the storage tank (8) through an infusion pump; the top of the support frame (1) is provided with a downwardly inclined feeding port (9) near the processing module (4), the bottom of the feeding port (9) is connected to the top of the filter box (10), the bottom of the filter box (10) is connected to the top of the storage tank (8) through a pipe, and the filter box (10) is provided with a filter section inside, which is used to filter the debris generated during processing.

2. The vertical turning-milling composite CNC machining lathe according to claim 1, characterized in that: The support frame (1) is provided with a shield (2) on the top outer side. A viewing door and window are provided on the inner side of the shield (2). A control panel (3) is installed on the right side surface of the shield (2). The control panel (3) is electrically connected to the processing module (4) and the three-axis adjustment module (41) respectively. A liquid replenishment pipe (81) is provided on the outside of the storage box (8). The storage box (8) and the filter box (10) are connected by a liquid drain pipe (82).

3. A vertical turning-milling composite CNC machining lathe according to claim 1, characterized in that: The filter section includes a filter screen frame (11) that is slidably disposed inside the filter box (10). A puller (12) is fixed on the outside of the filter screen frame (11). Fiber filter screens (13) are rotatably disposed at both ends of the inner side of the filter screen frame (11). A discharge mechanism is disposed on the bottom outer side of the fiber filter screen (13). A twisted rod (14) is fixed inside the filter box (10). The twisted rod (14) provides power to the rotating part (15) of the discharge mechanism.

4. A vertical turning-milling composite CNC machining lathe according to claim 3, characterized in that: The emission mechanism includes a rotating part (15) rotatably installed inside the filter screen frame (11). A threaded connecting block (16) is threadedly connected to the outer side of one end of the rotating part (15). Movable rods (18) are rotatably provided at both ends of the threaded connecting block (16). The end of the movable rod (18) away from the crossbar (17) is rotatably provided inside the rotating block (19). The top of the rotating block (19) is fixed to the bottom of the fiber filter screen (13).

5. A vertical turning-milling composite CNC machining lathe according to claim 4, characterized in that: The rotating part (15) includes a rotating cylinder (151) rotatably disposed inside the filter screen frame (11). One end of the rotating cylinder (151) is fixedly connected to a threaded rod (152). The outer side of the threaded rod (152) is threadedly connected to the inner side of the threaded connecting block (16). The inner side of the rotating cylinder (151) is spirally connected to the outer side of the twisted rod (14), and the twisted rod (14) and the rotating cylinder (151) are coaxially arranged.

6. A vertical turning-milling composite CNC machining lathe according to claim 4, characterized in that: The fiber filter (13) forms a rotating structure with the filter frame (11) via the rotating block (19). The fiber filter (13) rotates downward toward the filter box (10) with a rotation angle range of 0° to -25°.

7. A vertical turning-milling composite CNC machining lathe according to claim 4, characterized in that: The fiber filter screen (13) is symmetrically arranged in two sets about the vertical center line of the filter screen frame (11), and a sealing gasket is provided at the rotation connection of the movable rod (18).

8. A vertical turning-milling composite CNC machining lathe according to claim 3, characterized in that: The filter frame (11) is fixed with a fixed air cylinder (20) on both the left and right sides. A piston rod (21) extends into the fixed air cylinder (20). The end of the piston rod (21) away from the fixed air cylinder (20) is fixed inside the filter box (10). A number of air nozzles (22) are connected to one side of the fixed air cylinder (20) through a hose. The air nozzles (22) are installed on the upper inner side of the filter frame (11).

9. A vertical turning-milling composite CNC machining lathe according to claim 8, characterized in that: The air nozzle (22) is inclinedly disposed inside the filter mesh frame (11), and the air nozzle (22) is located on the outer side of the upper end of the fiber filter mesh (13).

10. A vertical turning-milling composite CNC machining lathe according to claim 8, characterized in that: A rubber ring is provided at one end of the piston rod (21) that extends into the fixed air cylinder (20), and the outer wall of the rubber ring is in contact with the inner wall of the fixed air cylinder (20); a one-way air inlet (201) is provided at one end of the piston rod (21), and a one-way air outlet is provided inside the air jet (22).

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