Spring processing apparatus and method

Abstract

The application discloses a spring machining device and belongs to the field of polishing equipment. The spring machining device comprises a positioning platform, a bracket which is slidingly connected to the positioning platform, a clamping assembly which is fixedly installed on the bracket and used for clamping the spring, and a positioning assembly which is slidingly arranged on the positioning platform and whose axis is collinear with the axis of the spring. The clamping assembly can be rotationally adapted according to the horizontal angle of the spring placed on the supporting shaft, and the clamping assembly is reset after clamping, so that the center of the spring and the mandrel are collinear, manual alignment is not needed, and the cutting efficiency of the spring is improved. The spring is tensioned and supported by using the expansion plate, and supporting force is provided for the vertical cutting direction. The expansion plate which is attached to the inner wall of the spring is used for polishing the inner wall of the spring, and the heat treatment residues of the spring are removed. The heat treatment residues after the expansion plate and the spring are separated from the spring.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of polishing equipment, in particular to a spring processing device and method. BACKGROUND

[0002] Spring is a necessary accessory in many devices, and is widely used in the interior of many devices including objects, so as to achieve the effects of shock absorption, reciprocation, etc. Spring machine refers to a mechanical device for producing springs, which is divided into: spring press, spring tensioner, universal machine, disc machine and special spring machine according to functional characteristics. Some medium and large springs are first cut into sections during processing, and then the ends of the steel bars are calcined to make springs. After the spring making is completed, in order to facilitate the installation and use of the spring, a flat surface is cut out at both ends of the spring, so that the flat surface after cutting needs to be polished.

[0003] In the prior art, before polishing, the quenched spring usually needs to be manually transferred to the processing table of the cutting machine, and the processing station of the spring also needs to be corrected, which not only reduces the cutting and polishing efficiency, but also increases the work consumption of the workers. In addition, the spring before cutting is subjected to heat treatment, which will leave heat treatment residues, which need to be manually polished on the surface, but the residues in the inner wall are not easy to clean, which further delays the efficiency of the spring entering the next process. SUMMARY

[0004] The purpose of the present application is to solve the problems in the prior art that the spring is usually manually transferred to the table of the cutting machine, and the processing station of the spring also needs to be corrected, which not only reduces the polishing efficiency, but also increases the work burden of the workers; and the spring before cutting is subjected to heat treatment, which will leave heat treatment residues, which need to be manually polished on the surface, but the residues in the inner wall are not easy to clean, which further delays the efficiency of the spring entering the next process. A spring processing device and method are provided.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0006] A spring processing device, comprising a positioning platform, further comprising: a bracket, the bracket is slidingly connected to the positioning platform; a clamping assembly fixedly installed on the bracket, the clamping assembly is used for clamping the spring; a positioning assembly slidingly arranged on the positioning platform, the axis of the positioning assembly is collinear with the axis of the spring.

[0007] Preferably, the bracket comprises two groups of positioning frames and a support shaft rotatingly arranged in the positioning frame, the bottom of the bracket is symmetrically provided with two groups of electric sliding tables, and the electric sliding tables are fixedly connected with the surface of the positioning platform.

[0008] In order to prevent the spring from being displaced during the cutting process, further, the clamping assembly comprises two sets of symmetrically arranged air cylinders, and a rotating assembly for driving the air cylinders to rotate is arranged on the bracket; wherein the telescopic rod end of the air cylinder is fixedly connected with a clamping plate, the clamping plate is arranged as an arc plate structure, and the arc plate has at least one tangent line with the spring.

[0009] In order to reduce the calibration process of the spring cutting station by manual operation before cutting, further, the bottom of the air cylinder is provided with a rotating assembly, the rotating assembly comprises a rotating shaft and a support plate connected to the top end of the rotating shaft, the air cylinder is fixedly installed on the upper surface of the support plate, a fixed frame is fixedly installed on one side of the positioning frame, and the rotating shaft is rotatably installed in the fixed frame through a bearing.

[0010] In order to realize automatic control and match the rotation angle and the placement angle of the spring, further, the two sets of rotating shafts are drivingly connected through second synchronous pulleys, one end of one set of the rotating shafts is fixedly installed with a first synchronous pulley, a first motor is slidingly connected to the bottom surface of the positioning platform through a linear guide rail, and the output shaft end of the first motor is also fixedly installed with a first synchronous pulley, the two sets of first synchronous pulleys are drivingly connected, a support is fixedly installed on one side of the positioning platform, a camera is installed on the top of the support, and the camera and the first motor are electrically connected.

[0011] Preferably, the positioning assembly comprises a mandrel and four sets of expansion plates elastically connected to the surface of the mandrel through compression springs, the mandrel is arranged as a cone structure, and the taper of the expansion plate is matched with the taper of the mandrel.

[0012] In order to ensure the stable support of the mandrel during movement, further, a stand is fixedly installed on the positioning platform, a guide plate is fixedly installed at the top end of the stand, and a sliding groove matched with the guide plate is formed in the bottom of the mandrel.

[0013] Since the cutting direction is from top to bottom, the horizontally arranged clamping force cannot provide vertical support force for the spring, further, the positioning assembly further comprises a screw rod for driving the mandrel to approach the spring, the screw rod and the mandrel are fixedly connected, a support lug plate is fixedly installed on the positioning platform, an internally threaded sleeve is rotatably connected in the support lug plate, the support lug plate penetrates and is threadedly connected in the internally threaded sleeve, a third synchronous pulley is fixedly installed at one end of the internally threaded sleeve, a second motor is fixedly installed on the positioning platform, the output shaft end of the second motor is also fixedly installed with a third synchronous pulley, and the two sets of third synchronous pulleys are drivingly connected.

[0014] In order to remove the heat treatment residues removed after the friction between the expansion plate and the inner wall of the spring, further, two groups of piston rods are symmetrically arranged at the two ends of the screw rod, the piston rods extend to the bottom of the positioning platform through the positioning platform, a guide groove is arranged in the positioning platform at the position where the piston rod penetrates, an air bellow is fixedly installed at the bottom of the positioning platform, a piston plate is arranged in the air bellow, the end of the piston rod away from the screw rod extends to the inside of the air bellow and is fixedly connected with the piston plate, and an air outlet pipe is communicated with the side of the air bellow away from the piston rod.

[0015] A spring processing method, comprising the following steps:

[0016] Step one: place the spring after heat treatment above the bracket, and place the spring horizontally in the same direction;

[0017] Step two: a camera is arranged on the positioning platform, the horizontal angle of the spring is detected by the camera, the collected signal is converted by the PLC, and then is transmitted to the first motor, and the first motor is started to drive the two groups of air cylinders to rotate until the clamping plate and the spring to be cut are parallel;

[0018] Step three: after the air cylinder is started to drive the clamping plate to clamp the spring, the clamping plate is reset, so that the center line of the spring is collinear with the center line of the mandrel;

[0019] Step four: the second motor is started to drive the rotating shaft and the mandrel to rotate, the rotating shaft approaches the spring to be cut during the rotating process, until the mandrel and the expansion plate penetrate into the inside of the spring to be cut, in this process, the clamping plate is in the clamping state, the expansion plate is moved forward in the process of being attached to the inner wall of the spring, and the heat treatment residues are polished off, at the same time, the piston rod moves along with the mandrel, drives the piston plate in the air bellow to extrude the air in the air bellow, pushes the air out through the air outlet pipe, and blows the heat treatment residues after the expansion plate and the spring away from the spring.

[0020] Compared with the prior art, the spring processing device and method have the following beneficial effects:

[0021] 1. The spring processing device, through the rotatable clamping assembly, the acquisition equipment and the first motor for rotary driving are electrically connected, so that the clamping assembly can be rotated and adapted according to the horizontal angle of the spring placed on the support shaft, the clamping assembly is reset after clamping, the center lines of the spring and the mandrel are collinear, manual alignment is not needed, and the cutting efficiency of the spring is improved.

[0022] 2. The spring processing device, the mandrel is arranged on one side of the bracket, the expansion plate elastically connected to the surface of the mandrel is arranged in the spring in the cutting station, after the mandrel enters the inside of the spring, the expansion plate is used for tensioning and supporting the spring, and supporting force is provided for the vertical cutting direction.

[0023] 3. This spring processing device uses a screw to drive the mandrel to move in the direction of the spring. The threaded connection structure allows the mandrel to rotate during the process of entering the spring. An expansion plate that fits against the inner wall of the spring is used to grind the inner wall of the spring to remove the heat treatment residue.

[0024] 4. The spring processing device, by setting a windbox at the bottom of the positioning platform, connects the piston rod and the piston plate inside the windbox. As the piston rod moves with the mandrel, it drives the piston plate to move inside the windbox, pushing air out through the air outlet pipe, blowing away the heat treatment residue after the expansion plate and spring are applied from the spring.

[0025] The parts of this device not described herein are the same as or can be implemented using existing technologies. The clamping assembly in this invention can be rotated to adapt to the horizontal angle of the spring placed on the support shaft, and reset after clamping to ensure that the center of the spring and the mandrel are collinear, eliminating the need for manual alignment and improving the cutting efficiency of the spring. The expansion plate is used to tension and support the spring, providing support force in the vertical cutting direction. The expansion plate, which is in contact with the inner wall of the spring, is used to grind the inner wall of the spring to remove the heat treatment residue. The heat treatment residue after the expansion plate and the spring act together is blown away from the spring. Attached Figure Description

[0026] Figure 1 This is a front-view three-dimensional structural diagram of a spring processing device proposed in this invention;

[0027] Figure 2 This is a three-dimensional structural diagram of the rotary drive component of the clamping assembly of a spring processing device proposed in this invention.

[0028] Figure 3 This is a three-dimensional structural diagram of a cylinder support component for a spring processing device proposed in this invention;

[0029] Figure 4 This is a three-dimensional structural diagram of the positioning component of a spring processing device proposed in this invention;

[0030] Figure 5 This is a schematic diagram of the elastic connection structure between the mandrel and the expansion plate of a spring processing device proposed in this invention;

[0031] Figure 6 This is a partial cross-sectional view of the positioning component of a spring processing device proposed in this invention;

[0032] Figure 7 This is a bottom-view three-dimensional structural diagram of a spring processing device proposed in this invention;

[0033] Figure 8 This is a schematic diagram of the bellows drive structure of a spring processing device proposed in this invention.

[0034] In the figure: 1, positioning platform; 2, electric sliding table; 3, positioning frame; 4, support shaft; 5, support; 6, camera; 7, first motor; 8, mounting seat; 9, linear guide rail; 10, first synchronous pulley; 11, second synchronous pulley; 12, rotating shaft; 13, air cylinder; 14, clamping plate; 15, support plate; 16, fixing frame; 17, bearing; 18, mandrel; 19, expansion plate; 20, compression spring; 21, screw; 22, support lug; 23, internal thread sleeve; 24, third synchronous pulley; 25, second motor; 26, guide plate; 27, column; 28, piston rod; 29, bellow; 30, piston plate; 31, air outlet pipe; 32, check valve; 33, guide groove. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0036] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0037] Embodiment:

[0038] With reference to Figures 1-8 A spring processing device, comprising a positioning platform 1, further comprising: a bracket, which is slidingly connected to the positioning platform 1; a clamping assembly fixedly installed on the bracket, which is used for clamping the spring; and a positioning assembly slidingly arranged on the positioning platform 1, which has an axis collinear with an axis of the spring.

[0039] In the embodiment, the rotating support shaft 4 is provided as a support member in direct contact with the spring to be cut, so as to minimize the friction generated by the spring during movement, and the support shaft 4 is connected by the positioning frame 3, and the entire bracket is movably arranged on the positioning platform 1 by the electric sliding table 2. After cutting is completed, the clamping assembly and the spring are moved to a discharge position, and can be manually taken out.

[0040] It should be noted that the first motor 7 is connected through the mounting seat 8 and the linear guide rail 9, so as to ensure that the first motor 7 can move synchronously with the spring during the movement of the electric sliding table 2 for discharging the spring.

[0041] The clamping assembly is fixedly installed on the bracket and used for clamping the spring. The clamping assembly comprises two groups of symmetrical air cylinders 13, the telescopic rod end of the air cylinder 13 is fixedly connected with a clamping plate 14, the clamping plate 14 is arranged in an arc plate structure, and the arc plate has at least one tangent line with the spring.

[0042] In the embodiment, the two groups of symmetrical air cylinders 13 and the clamping plate 14 arranged at the output shaft end of the air cylinder 13 are arranged, and the arc structure of the clamping plate 14 can effectively adhere to the outer wall of the spring during clamping, thereby improving the clamping effect.

[0043] The rotating assembly comprises a rotating shaft 12 and a support plate 15 connected to the top end of the rotating shaft 12. The air cylinder 13 is fixedly installed on the upper surface of the support plate 15. The fixed frame 16 is fixedly installed on one side of the positioning platform 1. The rotating shaft 12 is rotatably installed in the fixed frame 16 through the bearing 17. The bearing 17 is arranged as a low-damping bearing. The two groups of rotating shafts 12 are drivingly connected through the second synchronous belt wheel 11. One end of one group of rotating shafts 12 is fixedly installed with the first synchronous belt wheel 10. The first motor 7 is slidingly connected to the bottom surface of the positioning platform 1 through the linear guide rail 9. The output shaft end of the first motor 7 is also fixedly installed with the first synchronous belt wheel 10. The two groups of first synchronous belt wheels 10 are drivingly connected. The support 5 is fixedly installed on one side of the positioning platform 1. The camera 6 is installed on the top of the support 5. The camera 6 and the first motor 7 are electrically connected.

[0044] In the embodiment, the rotating assembly is arranged at the bottom of the air cylinder 13, which can drive the air cylinders 13 on both sides to rotate by a certain angle based on the horizontal angle of the spring placed on the support shaft 4. It should be noted that the camera 6 is arranged on the positioning platform 1. The horizontal angle of the spring placed on the support shaft 4 is collected by the camera 6. The collected data is converted by the PLC and transmitted to the first motor 7. The first motor 7, the first synchronous belt wheel 10 and the second synchronous belt wheel 11 drive the two groups of air cylinders 13 to rotate. After rotation, the clamping direction of the clamping plate 14 is perpendicular to the center line of the horizontally placed spring to be cut. The air cylinder 13 drives the clamping plate 14 to clamp the spring to be cut. Then, it is reset. The spring can be moved to the below of the cutting head through the electric sliding table 2.

[0045] It should be noted that the bearing 17 is arranged as a low-damping bearing, which can drive the air cylinder 13 to rotate and maintain a certain friction force after rotation, thereby eliminating the flexible connection error of the synchronous belt transmission.

[0046] The positioning assembly can penetrate the center of the spring. The positioning assembly is slidingly arranged on the positioning platform 1, and the axis of the positioning assembly and the axis of the spring are collinear. The positioning assembly comprises a core shaft 18 and four groups of expansion plates 19 elastically connected to the surface of the core shaft 18 through the compression spring 20. The core shaft 18 is arranged in a cone structure. The taper of the expansion plate 19 and the taper of the core shaft 18 are matched.

[0047] In this embodiment, the surface of the mandrel 18 is provided with an expansion plate 19. When the mandrel 18 penetrates into the spring, the elastic tension of the expansion plate 19 provides support for the spring, avoiding deformation of the spring during cutting.

[0048] It should be noted that the mandrel 18 and the expansion plate 19 are both provided in a conical structure, with the smaller diameter end first entering the spring until the expansion plate 19 is fully attached to the inner wall of the spring and tensioned.

[0049] The positioning platform 1 is fixedly provided with a stand 27, the top end of the stand 27 is fixedly provided with a guide plate 26, and the bottom of the mandrel 18 is provided with a sliding groove matched with the guide plate 26.

[0050] In this embodiment, the positioning platform 1 is provided with a stand 27, the top end of the stand 27 is connected with a guide plate 26, the mandrel 18 and the guide plate 26 are slidingly connected, which is used to ensure the stability of the mandrel 18 during moving into the spring.

[0051] The positioning assembly further comprises a screw rod 21 for driving the mandrel 18 to approach the spring, the screw rod 21 is fixedly connected with the mandrel 18, the positioning platform 1 is fixedly provided with a support ear plate 22, the support ear plate 22 is rotatably connected with an internal thread sleeve 23, the support ear plate 22 penetrates through and is threadedly connected in the internal thread sleeve 23, one end of the internal thread sleeve 23 is fixedly provided with a third synchronous pulley 24, the positioning platform 1 is fixedly provided with a second motor 25, and the output shaft end of the second motor 25 is also fixedly provided with a third synchronous pulley 24, and the two groups of third synchronous pulleys 24 are drivingly connected.

[0052] In this embodiment, the screw rod 21 is provided at one end of the mandrel 18. When the mandrel 18 needs to penetrate the spring, the second motor 25 is started, the second motor 25 drives the third synchronous pulley 24 to rotate, and the internal thread sleeve 23 is threadedly connected with the screw rod 21. Therefore, the second motor 25 can drive the screw rod 21 to move in the internal thread sleeve 23, so as to move the mandrel 18 and the expansion plate 19 into the spring.

[0053] The screw rod 21 is symmetrically provided with two groups of piston rods 28 at both ends, the piston rods 28 penetrate through the positioning platform 1 and extend to the bottom of the positioning platform 1, the positioning platform 1 is provided with a guide groove 33 at the position where the piston rods 28 penetrate, the bottom of the positioning platform 1 is fixedly provided with a bellows 29, the bellows 29 is provided with a piston plate 30, the end of the piston rod 28 away from the screw rod 21 extends to the inside of the bellows 29 and is fixedly connected with the piston plate 30, and the side of the bellows 29 away from the piston rod 28 is communicated with an air outlet pipe 31, and the air outlet pipe 31 is provided with a one-way valve 32.

[0054] The piston rod 28 is symmetrically arranged on both sides of the screw rod 21 in the embodiment, the guide groove 33 matched with the piston rod 28 is arranged in the positioning platform 1, and the guide groove 33 is used for guiding the piston rod 28 when the piston rod 28 moves along with the mandrel 18, the air bellow 29 is arranged at the bottom of the positioning platform 1, the piston plate 30 in the air bellow 29 is connected with the piston rod 28, so that the piston plate 30 is driven to extrude air in the air bellow 29, and the air is pushed out through the air outlet pipe 31, so that the heat treatment residue after the spring is acted on by the expansion plate 19 and the spring is blown away from the spring.

[0055] In the application, the spring after heat treatment is placed above the bracket, so that the spring is placed in a horizontal direction; the horizontal angle of the spring is detected by the camera 6 arranged on the positioning platform 1, and the collected signal is transmitted to the PLC, and the PLC converts the collected signal and transmits the converted signal to the first motor 7, so that the first motor 7 is started to drive the two groups of air cylinders 13 to rotate until the clamping plate 14 and the spring to be cut are parallel; after the clamping plate 14 clamps the spring and is reset, the center line of the spring is collinear with the center line of the mandrel 18; then, the second motor 25 is started, the rotation shaft 12 and the mandrel 18 are driven to rotate through the transmission of the third synchronous belt pulley 24, and the rotation shaft 12 approaches the spring to be cut in the rotating process; in this process, the clamping plate 14 is in a clamped state, so that the heat treatment residue can be polished away when the expansion plate 19 rotates and moves while adhering to the inner wall of the spring; at the same time, the piston rod 28 moves along with the mandrel 18, and the piston plate 30 in the air bellow 29 is driven to extrude the air in the air bellow 29, so that the air is pushed out through the air outlet pipe 31, and the heat treatment residue after the spring is acted on by the expansion plate 19 is blown away from the spring.

[0056] The application further provides a spring machining method, which comprises the following steps:

[0057] Step one: the spring after heat treatment is placed above the bracket, so that the spring is placed in a horizontal direction;

[0058] Step two: the camera 6 is arranged on the positioning platform 1, the horizontal angle of the spring is detected by the camera 6, the collected signal is converted by the PLC, and the converted signal is transmitted to the first motor 7, so that the first motor 7 is started to drive the two groups of air cylinders 13 to rotate until the clamping plate 14 and the spring to be cut are parallel;

[0059] Step three: after the clamping plate 14 clamps the spring and is reset, the center line of the spring is collinear with the center line of the mandrel 18;

[0060] Step four: start the second motor 25 to drive the rotating shaft 12 and the mandrel 18 to rotate, the rotating shaft 12 approaches the spring to be cut in the rotating process, until the mandrel 18 and the expansion plate 19 penetrate into the inside of the spring to be cut, in this process, the clamping plate 14 is in the clamping state, the expansion plate 19 is removed from the heat treatment residue in the process of moving forward with the spring inner wall, at the same time, the piston rod 28 moves with the mandrel 18, drives the piston plate 30 in the bellow 29 to extrude the air in the bellow 29, pushes the air out through the air outlet pipe 31, blows the heat treatment residue after the expansion plate 19 and the spring away from the spring.

[0061] The above description is only the preferred embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A spring machining device comprising a positioning platform (1), characterized in that, Also include: The bracket is slidingly connected to the positioning platform (1); Fixedly installed on the bracket clamping assembly, the clamping assembly is used for clamping spring; The positioning assembly is slidingly arranged on the positioning platform (1), and the axis of the positioning assembly is coaxial with the axis of the spring; The bracket includes two sets of positioning frames (3) and support shafts (4) rotatably arranged in the positioning frames (3), and the bottom of the bracket is symmetrically provided with two sets of electric sliding tables (2), the electric sliding tables (2) are fixedly connected with the surface of the positioning platform (1); The clamping assembly includes two sets of symmetrically arranged air cylinders (13), and the bracket is provided with a rotating assembly for driving the air cylinders (13) to rotate; Wherein, the telescopic rod end of the air cylinder (13) is fixedly connected with the clamping plate (14); The rotating assembly includes a rotating shaft (12) and a support plate (15) connected to the top end of the rotating shaft (12), the air cylinder (13) is fixedly installed on the upper surface of the support plate (15), one side of the positioning frame (3) is fixedly installed with a fixed frame (16), the rotating shaft (12) is rotatably installed in the fixed frame (16) through a bearing (17); Two sets of the rotating shafts (12) are drivingly connected through a second synchronous belt wheel (11), one end of one set of the rotating shafts (12) is fixedly installed with a first synchronous belt wheel (10), the bottom surface of the positioning platform (1) is slidingly connected with a first motor (7) through a linear guide rail (9), the output shaft end of the first motor (7) is also fixedly installed with a first synchronous belt wheel (10), two sets of the first synchronous belt wheels (10) are drivingly connected, one side of the positioning platform (1) is fixedly installed with a bracket (5), the top of the bracket (5) is installed with a camera (6), the camera (6) and the first motor (7) are electrically connected; The positioning assembly includes a mandrel (18) and four sets of expansion plates (19) elastically connected to the surface of the mandrel (18) through compression springs (20), the mandrel (18) is arranged in a vertebral body structure, and the taper of the expansion plate (19) is matched with the taper of the mandrel (18); A vertical column (27) is fixedly installed on the positioning platform (1), a guide plate (26) is fixedly installed on the top end of the vertical column (27), and a sliding groove matched with the guide plate (26) is formed in the bottom of the mandrel (18); The positioning assembly further includes a screw rod (21) for driving the mandrel (18) to approach the spring, the screw rod (21) and the mandrel (18) are fixedly connected, a support lug (22) is fixedly installed on the positioning platform (1), an internally threaded sleeve (23) is rotatably connected in the support lug (22), the screw rod (21) penetrates and is threadedly connected in the internally threaded sleeve (23), a third synchronous belt wheel (24) is fixedly installed at one end of the internally threaded sleeve (23), a second motor (25) is fixedly installed on the positioning platform (1), and the output shaft end of the second motor (25) is also fixedly installed with a third synchronous belt wheel (24), two sets of the third synchronous belt wheels (24) are drivingly connected.

2. A spring machining apparatus according to claim 1, wherein The screw rod (21) is symmetrically provided with two groups of piston rods (28) on both sides, the piston rods (28) extend to the bottom of the positioning platform (1) through the positioning platform (1), a guide groove (33) is arranged in the positioning platform (1) at the through position of the piston rod (28), a wind box (29) is fixedly installed at the bottom of the positioning platform (1), a piston plate (30) is arranged in the wind box (29), the piston rod (28) extends to the inside of the wind box (29) and is fixedly connected with the piston plate (30) at the end away from the screw rod (21), an air outlet pipe (31) is communicated with the side of the wind box (29) away from the piston rod (28), and a one-way valve (32) is arranged in the air outlet pipe (31).

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