Press fitting device and assembling method for valve element of high-speed switch valve

Abstract

The invention provides a high-speed switch valve element press-fitting device and an assembling method.The device comprises a front end valve element press-fitting module and a valve element assembly press-fitting module which are sequentially arranged on a high-speed switch valve element press-fitting assembly line, and the front end valve element press-fitting module completes press-fitting in a manual clamping and pneumatic buckling and pressing mode; a cylinder rod of the air cylinder is connected with the pressing rod, the pressing rod drives the double clamping arms to clamp the valve element at the front end, and the pressing rod pushes the valve bonnet to move downwards and bend the valve bonnet. The valve element assembly press-fitting module is of a four-claw riveting structure, press-fitting is completed in a manual clamping and pneumatic riveting mode, an air cylinder rod is connected with a rotary disc through a rotary shaft, a riveting tool bit is connected with a sliding block through a bolt, the rotary disc drives the sliding block and the tool bit to move along a rail, and riveting of a valve element assembly sleeve is completed. According to the device, clamping and press fitting are independently carried out, operation is easy and efficient, safety and reliability are achieved, and efficient and reliable press fitting of the valve element structure of the high-speed switch valve with the small size and high matching precision can be achieved.

Description

Technical Field

[0001] The invention belongs to the field of digital electro-hydraulics and relates to a high-speed switch valve core press-fitting device and an assembly method. Background Art

[0002] In digital electro-hydraulic systems, especially in the field of engineering machinery, high-speed switching valves play a very important role. They have the characteristics of small size, high control accuracy and rapid response, and are often used in the proportional control of multi-way valves in engineering machinery.

[0003] The valve core of a high-speed on-off valve has a compact structure, small size, high matching accuracy, and a single set of valve cores requires multiple riveting points. In the existing technology, it is mostly organized manually. However, traditional manual press-fitting is difficult to assemble and the press-fitting quality is uncontrollable. Phenomena such as press deviation, deformation, irregular bending, and loose press-fitting often occur. Therefore, it is particularly important to develop an efficient and reliable valve core press-fitting device. Summary of the invention

[0004] In order to overcome the problems of small size of high-speed switch valve core parts, high assembly precision requirements, and firm and reliable press-fit riveting, the present invention develops a high-speed switch valve core press-fit device and method, which adopts a two-station press-fit process and pneumatic press-fit to achieve reliable press-fitting of the valve core.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] The present invention first provides a high-speed switch valve valve core press-fitting device, which comprises a front-end valve core press-fitting module and a valve core assembly press-fitting module which are sequentially arranged on a press-fitting assembly line; wherein the front-end valve core press-fitting module is used for press-fitting the front-end valve core of the high-speed switch valve, and the valve core assembly press-fitting module is used for press-fitting the valve core assembly including the front-end valve core;

[0007] The front-end valve core pressing module includes a first cylinder, a guide sleeve, a valve core positioning seat, a pressure rod, a clamping arm, a first roller and a spring; the output end of the first cylinder is connected to the pressure rod, the pressure rod is vertically arranged and coaxially arranged with the valve core positioning seat; the pressure rod passes through the guide sleeve; a clamping arm mounting seat is arranged at the lower end of the guide sleeve, and the two sides of the clamping arm mounting seat are respectively hinged to the middle parts of two symmetrically arranged clamping arms through a rotating shaft, and the two first rollers are respectively connected to the top ends of the two clamping arms through a rotating shaft, and the spring is arranged in the clamping arm mounting seat. Under the action of the spring elastic force, the two first rollers remain in contact with the end of the pressure rod, and the end of the pressure rod is a conical structure. During the process of pressing the pressure rod downward, the conical position will push the two first rollers outward, so that the bottom ends of the two clamping arms swing around the rotating shaft and clamp the valve body; after clamping, the first cylinder drives the pressure rod to continue pressing downward;

[0008] The valve core assembly pressing module includes a second cylinder, a base, a valve core assembly positioning seat, a turntable, multiple riveting assemblies, and a second roller. The second cylinder is connected to the turntable to drive the turntable to rotate. The turntable is arranged in the base and connected to the base through a rotating shaft sleeve. The valve core assembly positioning seat is located at the center of the base and is used to position the valve core assembly to be pressed. A plurality of cam grooves are evenly arranged along the circumference of the turntable, and a second roller is arranged in each cam groove. The cam groove of the turntable can generate thrust on the second roller as the turntable rotates. The second roller is fixedly connected to the riveting assembly. Under the action of the thrust of the cam groove of the turntable, the second roller moves toward the position of the valve core assembly and drives the riveting assembly to move toward the position of the valve core assembly to extrude the valve core sleeve to complete the riveting.

[0009] The present invention also provides a press-fitting method based on the high-speed switch valve core press-fitting device, which comprises the following steps:

[0010] Place the valve body, ball core and valve bonnet of the high-speed on-off valve to be assembled from bottom to top in the positioning hole of the valve core positioning seat; align the valve core positioning seat with the pressure rod; start the first cylinder to drive the pressure rod to move downward, and when the conical structure at the end of the pressure rod acts on the first roller connected to the top of the clamping arm, the bottom end of the clamping arm swings inward, and when the main body of the pressure rod is inserted between the first rollers, the clamping arm completely clamps the valve core; the first cylinder drives the pressure rod to continue to press down, and the valve bonnet shrinks along the conical surface of the clamping claw under the action of the pressure rod to complete the bending; after the assembly is completed, the first cylinder retracts, the clamping arm is fully opened under the action of the spring, and the front end valve core that has been pressed and installed is taken out;

[0011] Assemble the parts of the valve core assembly in sequence and put them into the positioning hole of the valve core assembly positioning seat; align the straightening sleeve and the top of the valve core assembly and straighten and press them; start the second cylinder, the second cylinder drives the turntable to rotate around the axis of the base, the turntable cam groove generates thrust on the second roller as the turntable rotates, the second roller is fixedly connected to the riveting component, the second roller moves toward the position of the valve core assembly under the action of the thrust of the turntable cam groove and drives the riveting component to move toward the position of the valve core assembly to squeeze the valve core sleeve to complete the riveting; after the riveting is completed, the second cylinder retracts, the cylinder drives the turntable to rotate and drives the riveting component to open synchronously, take out the riveted workpiece, and install the front end valve core O-ring, so that the valve core assembly is pressed.

[0012] Compared with the prior art, the present invention takes into account the actual press-fitting requirements of the high-speed switch valve, and divides the press-fitting process into two sections: the front-end valve core press-fitting and the valve core assembly press-fitting. During the front-end valve core press-fitting process, the present invention utilizes the conical design of the end of the pressure rod so that the clamping arm can gradually clamp the front-end valve core during the downward pressing of the pressure rod. When the pressure rod acts on the valve cap, the valve cap can be bent along the surface of the clamping claw of the clamping arm to complete the press-fitting. During the valve core assembly press-fitting process, the valve core assembly press-fitting module is a four-claw riveting structure, and the press-fitting is completed by manual clamping and pneumatic riveting. The cylinder rod is connected to the turntable through a rotating shaft, and the riveting cutter head is connected to the slider through bolts. The turntable drives the slider and the cutter head to move along the track to complete the riveting of the valve core assembly sleeve. The clamping and press-fitting of this device are independent actions, simple and efficient operation, safe and reliable, and can achieve efficient and reliable press-fitting of the valve core structure of a high-speed switch valve with small size and high matching accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a high-speed on-off valve core press-fit device;

[0014] Figure 2 This is a structural diagram of the valve core press-fit module at the front end of the high-speed switch valve;

[0015] Figure 3 It is a structural schematic diagram of a press-fit module of a high-speed switching valve core assembly;

[0016] Figure 4 It is the schematic diagram of the front valve core;

[0017] Figure 5 The figure is a schematic diagram of the valve core assembly;

[0018] Among them, 001-front end valve core press-fitting module, 002-valve core assembly press-fitting module; 101-first cylinder, 102-guide sleeve, 103-valve core positioning seat, 104-pressure rod, 105-clamping arm, 106-first roller, 107-spring; 201-second cylinder, 202-base, 203-valve core assembly positioning seat, 204-turntable, 205-end cover, 206-slider, 207-knife head, 208-second roller, 209-straightening cylinder, 210-bottom plate; 301-valve body, 302-ball core, 303-valve cap, 304-O-ring. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0020] like Figure 4The figure shows a schematic diagram of the structure of the front end valve core of the high-speed switch valve to be press-fitted according to the embodiment of the present invention. The front end valve core of the high-speed switch valve includes a valve body 301, a ball core 302 and a valve cap 303 from bottom to top. The purpose of press-fitting the front end valve core is to press the valve core into the valve body 301 and use the valve cap 303 to encapsulate the valve core. The encapsulation work is mainly achieved by bending the edge of the valve cap 303 inward along the gap between the clamping claw and the valve body 301 during the downward pressing process, so as to cooperate with the valve body 301 to complete the fastening. Figure 4 and Figure 5 The dimensions marked in the figure are all in mm, which shows that the high-speed switching valve has a compact structure and small size.

[0021] like Figure 5 The figure is a schematic diagram of the structure of the high-speed switch valve core assembly to be press-fitted in the embodiment. The front valve core needs to be further press-fitted with the valve stem and the rear valve seat to form the valve core assembly. The axial dimension of the valve core assembly is long and the radial dimension is short. Once the angle of the assembly is off during press-fitting, there will be problems with the press-fitting accuracy, resulting in defective products during verification.

[0022] Based on this, Figure 1-Figure 3 As shown, an embodiment of the present invention provides a high-speed on-off valve core press-fitting device, which includes a front-end valve core press-fitting module 001 and a valve core assembly press-fitting module 002 arranged sequentially on a press-fitting assembly line. The front-end valve core press-fitting module 001 is used for press-fitting the front-end valve core of the high-speed on-off valve, and the valve core assembly press-fitting module 002 is used for press-fitting the valve core assembly including the front-end valve core.

[0023] like Figure 2 As shown, the front-end valve core press-fitting module 001 includes a first cylinder 101, a guide sleeve 102, a valve core positioning seat 103, a pressure rod 104, a clamping arm 105, a first roller 106 and a spring 107; the output end of the first cylinder 101 is connected to the pressure rod 104, the pressure rod 104 is vertically arranged and coaxially arranged with the valve core positioning seat 103; the pressure rod 104 passes through the guide sleeve 102; the lower end of the guide sleeve 102 is provided with a clamping arm 105 mounting seat, and the two sides of the clamping arm 105 mounting seat are respectively connected to two symmetrically arranged clamping arms 105 through a rotating shaft. The middle part is hinged, and the two first rollers 106 are respectively connected to the top of the two clamping arms 105 through a rotating shaft. The spring 107 is set in the mounting seat of the clamping arm 105. Under the elastic force of the spring 107, the two first rollers 106 remain in contact with the end of the pressure rod 104. The end of the pressure rod 104 is a conical structure. During the downward pressing of the pressure rod 104, the conical position will push the two first rollers 106 outward, so that the bottom ends of the two clamping arms 105 swing around the rotating shaft and clamp the valve body 301; after clamping, the first cylinder 101 drives the pressure rod 104 to continue pressing down.

[0024] The valve core positioning seat 103 is located below the guide sleeve 102, and a positioning hole coaxially opened with the pressure rod 104 is provided in the valve core positioning seat 103; before press-fitting, the valve body 301, the ball core 302 and the valve cap 303 of the front end valve core to be assembled are placed in the positioning hole in sequence from bottom to top; during press-fitting, the pressure rod 104 pushes the valve cap 303 to move downward for assembly.

[0025] Furthermore, the middle portion of the mounting seat of the clamping arm 105 has a space for the pressure rod 104 to pass through when pressed downward; the two clamping arms 105 are symmetrically arranged about the vertical center line of the mounting seat of the clamping arm 105.

[0026] In a specific embodiment of the present invention, the end of the clamping arm 105 is a clamping claw, and the clamping claw is provided with a guide surface. The clamping claw clamps the valve bonnet 303. When the pressure rod 104 is pressed down and acts on the valve bonnet 303, the valve bonnet 303 is retracted toward the wall of the valve body 301 along the guide surface of the clamping claw under the action of the pressure rod 104 to complete the bending, thereby achieving the bending synchronously during the press-fitting process. The guide surface can be a protrusion or an inclined surface provided on the clamping claw, and its specific shape is set according to the structure of the valve body 301301, and its purpose is to make the valve bonnet 303 retract and bend completely during the downward movement, so as to complete the fastening with the valve body 301.

[0027] In a specific embodiment of the present invention, the valve core assembly pressing module 002 includes a second cylinder 201, a base 202, a valve core assembly positioning seat 203, a turntable 204, multiple groups of riveting assemblies, and a second roller 208. The second cylinder 201 is connected to the turntable 204 to drive the turntable 204 to rotate. The turntable 204 is arranged in the base 202 and is connected to the base 202 through a rotating sleeve; the valve core assembly positioning seat 203 is located at the center of the base 202 to position the valve core assembly to be pressed; a plurality of cam grooves are evenly arranged along the circumference of the turntable 204, and a second roller 208 is arranged in each cam groove. The cam groove of the turntable 204 can generate thrust on the second roller 208 as the turntable 204 rotates, and the second roller 208 is fixedly connected to the riveting assembly. Under the action of the thrust of the cam groove of the turntable 204, the second roller 208 moves toward the position of the valve core assembly and drives the riveting assembly to move toward the position of the valve core assembly to squeeze the valve core sleeve to complete the riveting.

[0028] Preferably, the valve core assembly positioning seat 203 has a positioning hole. Before the valve core assembly is pressed, the various parts of the valve core assembly are sequentially placed in the positioning hole; the valve core assembly press-fitting module 002 also includes a straightening cylinder 209. After the various parts of the valve core assembly are placed in the positioning hole, the straightening cylinder 209 is sleeved on the periphery of the valve core assembly for straightening. The straightening cylinder 209 is a hollow cylinder, and its bottom is set in an L shape so that it can be stabilized. The inner diameter of the straightening cylinder 209 is equal to the maximum outer diameter of the high-speed switch valve to be pressed, ensuring that the front end valve core, valve stem, and rear end valve seat to be pressed can be set vertically.

[0029] Preferably, the number of the riveting components is not less than 3 groups; the riveting components include a cutter head 207 and a slider 206; the first roller 106 and the slider 206 are fixedly connected by bolts, and the cutter head 207 and the slider 206 are fixedly connected by bolts. The first roller 106 moves toward the valve core assembly position under the thrust of the cam groove of the turntable 204 and drives the slider 206 and the cutter head 207 to move along the slide toward the valve core assembly position, and the cutter head 207 squeezes the valve core sleeve to complete the riveting.

[0030] like Figure 1 and Figure 3 As shown, in the embodiment of the present invention, the number of riveting assemblies is 4 groups, which are evenly arranged at 90 degrees. The turntable and the base are connected by a rotating sleeve, and the fit is precise. The cutter head and the slider move along the slide seat to ensure that the four cutter heads are clamped and riveted synchronously. The valve core at the front end of the high-speed switch valve has a compact structure and a small size, and a single set of valve cores needs to have 3 riveting points. Traditional manual press-fitting is difficult to assemble and the press-fitting quality is uncontrollable. Phenomena such as press deviation, deformation, irregular bending, and loose press-fitting often occur. The present invention adopts a pneumatic press-fitting method, which can complete the riveting of 3 riveting points at one time, significantly improving the yield rate and press-fitting efficiency.

[0031] The press-fitting process of the high-speed switch valve core press-fitting device of the present invention mainly includes the following steps:

[0032] Place the valve body 301, ball core 302 and valve bonnet 303 of the high-speed on-off valve to be assembled from bottom to top into the positioning hole of the valve core positioning seat 103; align the valve core positioning seat 103 with the pressure rod 104; start the first cylinder 101 to drive the pressure rod 104 to move downward, when the conical structure at the end of the pressure rod 104 acts on the first roller 106 connected to the top of the clamping arm 105, the bottom end of the clamping arm 105 swings inward, and when the main body of the pressure rod 104 is inserted between the first rollers 106, the clamping arm 105 completely clamps the valve core; the first cylinder 101 drives the pressure rod 104 to continue to press down, and the valve bonnet 303 shrinks along the conical surface of the clamping claw under the action of the pressure rod 104 to complete the bending; after the assembly is completed, the first cylinder 101 retracts, the clamping arm 105 is fully opened under the action of the spring 107, and the front end valve core that has been pressed and installed is taken out;

[0033] Assemble the parts of the valve core assembly in sequence and put them into the positioning hole of the valve core assembly positioning seat 203; put the straightening cylinder 209 on the top of the valve core assembly and straighten and press it; start the second cylinder 201, and the second cylinder 201 drives the turntable 204 to rotate around the axis of the base 202. The cam groove of the turntable 204 rotates with the turntable 204 to generate thrust on the second roller 208. The second roller 208 is fixedly connected to the riveting component. Under the action of the thrust of the cam groove of the turntable 204, the second roller 208 moves toward the position of the valve core assembly and drives the riveting component to move toward the position of the valve core assembly to squeeze the valve core sleeve to complete the riveting; after the riveting is completed, the second cylinder 201 retracts, the cylinder drives the turntable 204 to rotate and drives the riveting component to open synchronously, take out the riveted workpiece, and install the front end valve core OO ring 304. At this point, the valve core assembly is pressed.

[0034] In a specific embodiment of the present invention, the front-end valve core press-fitting module 001 is press-fitted by manual clamping and pneumatic pressing. The cylinder rod is connected to the pressure rod 104. The pressure rod 104 drives the double clamping arm 105 to clamp the front-end valve core. The pressure rod 104 pushes the valve cap 303 to move downward and completes the bending. The valve core assembly press-fitting module 002 is a four-claw riveting structure, which is press-fitted by manual clamping and pneumatic riveting. The front-end valve core of the high-speed switch valve has a compact structure and small size. The traditional manual press-fitting is difficult to assemble and the press-fitting quality is uncontrollable. There are often phenomena such as press deviation, deformation, irregular bending, and loose press-fitting. The present invention adopts pneumatic press-fitting, one-time molding, and significantly improves the yield rate and press-fitting efficiency.

[0035] The method of the present invention can quickly and efficiently complete the assembly of high-speed switch valves and improve the quality stability of each batch of high-speed switch valves, thereby improving the control accuracy of a high-speed switch valve group assembled from multiple high-speed switch valves.

[0036] The above-mentioned embodiments only express the specific implementation of the present invention, and the description thereof is relatively detailed, but it cannot be understood as limiting the scope of the present invention. For ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A high-speed on-off valve core press-fitting device, characterized in that: It comprises a front-end valve core press-fitting module (001) and a valve core assembly press-fitting module (002) which are sequentially arranged on a press-fitting assembly line; wherein the front-end valve core press-fitting module (001) is used for press-fitting the front-end valve core of a high-speed switch valve, and the valve core assembly press-fitting module (002) is used for press-fitting the valve core assembly including the front-end valve core; The front-end valve core pressing module (001) comprises a first cylinder (101), a guide sleeve (102), a valve core positioning seat (103), a pressure rod (104), a clamping arm (105), a first roller (106) and a spring (107); the output end of the first cylinder is connected to the pressure rod, which is vertically arranged and coaxially arranged with the valve core positioning seat; the pressure rod passes through the guide sleeve; a clamping arm mounting seat is arranged at the lower end of the guide sleeve, and the two sides of the clamping arm mounting seat are respectively hinged to the middle parts of two symmetrically arranged clamping arms through a rotating shaft, and the two first rollers are respectively connected to the top ends of the two clamping arms through a rotating shaft, and the spring is arranged in the clamping arm mounting seat. Under the action of the spring elastic force, the two first rollers remain in contact with the end of the pressure rod, and the end of the pressure rod is a conical structure. During the process of pressing the pressure rod downward, the conical position will push the two first rollers outward, so that the bottom ends of the two clamping arms swing around the rotating shaft and clamp the valve body; after clamping, the first cylinder drives the pressure rod to continue pressing downward; The valve core assembly press-fitting module (002) comprises a second cylinder (201), a base (202), a valve core assembly positioning seat (203), a turntable (204), a plurality of riveting assemblies, and a second roller (208). The second cylinder is connected to the turntable for driving the turntable to rotate. The turntable is arranged in the base and connected to the base via a rotating shaft sleeve. The valve core assembly positioning seat (203) is located at the center of the base for positioning the valve core assembly to be press-fitted. A plurality of cam grooves are evenly arranged along the circumference of the turntable. A second roller (208) is arranged in each cam groove. The turntable cam groove can generate thrust on the second roller (208) as the turntable rotates. The second roller (208) is fixedly connected to the riveting assemblies. Under the action of the thrust of the turntable cam groove, the second roller moves toward the position of the valve core assembly and drives the riveting assemblies to move toward the position of the valve core assembly to squeeze the valve core sleeve to complete the riveting.

2. The high-speed on-off valve core press-fitting device according to claim 1, characterized in that: The valve core positioning seat (103) is located below the guide sleeve (102), and a positioning hole coaxially opened with the pressure rod is provided in the valve core positioning seat (103); before press-fitting, the valve body (301), the ball core (302) and the valve cap (303) of the front valve core to be assembled are placed in the positioning hole in sequence from bottom to top; during press-fitting, the pressure rod pushes the valve cap to move downward for assembly.

3. The high-speed on-off valve core press-fitting device according to claim 1, characterized in that: The middle part of the clamping arm mounting seat has a space for the pressure rod (104) to pass through when pressed downward; the two clamping arms are symmetrically arranged about the vertical center line of the clamping arm mounting seat.

4. The high-speed on-off valve core press-fitting device according to claim 1, characterized in that: The end of the clamping arm (105) is a clamping claw, which is provided with a guide surface. The conical guide surface of the clamping claw clamps the valve bonnet. When the pressure rod is pressed down and acts on the valve bonnet, the valve bonnet shrinks along the guide surface of the clamping claw under the action of the pressure rod to complete the bending.

5. The high-speed on-off valve core press-fitting device according to claim 1, characterized in that: The valve core assembly positioning seat (203) has a positioning hole. Before the valve core assembly is press-fitted, the various parts of the valve core assembly are sequentially placed in the positioning hole. The valve core assembly press-fitting module also includes a straightening cylinder (209). After the various parts of the valve core assembly are placed in the positioning hole, the straightening cylinder (209) is sleeved on the periphery of the valve core assembly for straightening.

6. The high-speed on-off valve core press-fitting device according to claim 1, characterized in that: The number of the riveting assemblies is not less than 3 groups; the riveting assemblies include a cutter head (207) and a slider (206); the first roller (208) and the slider (206) are fixedly connected by bolts, and the cutter head (207) and the slider (206) are fixedly connected by bolts; the first roller moves toward the valve core assembly position under the thrust of the turntable cam groove and drives the slider (206) and the cutter head (207) to move along the slideway toward the valve core assembly position, and the cutter head squeezes the valve core sleeve to complete the riveting.

7. A press-fitting method for the high-speed on-off valve core press-fitting device according to claim 1, characterized in that: The steps include: The valve body (301), ball core (302) and valve cap (303) of the high-speed switch valve to be assembled are placed from bottom to top in the positioning hole of the valve core positioning seat (103); the valve core positioning seat (103) is aligned with the pressure rod; the first cylinder (101) is started to drive the pressure rod (104) to move downward, and when the conical structure at the end of the pressure rod acts on the first roller connected to the top of the clamping arm, the bottom end of the clamping arm (105) swings inward, and when the main body of the pressure rod is inserted between the first rollers, the clamping arm completely clamps the valve core; the first cylinder drives the pressure rod to continue to press downward, and the valve cap shrinks along the conical surface of the clamping claw under the action of the pressure rod to complete the bending; after the assembly is completed, the first cylinder (101) is retracted, and the clamping arm (105) is fully opened under the action of the spring (107), and the front end valve core that has been pressed and installed is taken out; Assemble the various parts of the valve core assembly in sequence and place them into the positioning hole of the valve core assembly positioning seat (203); put the straightening cylinder (209) on the top of the valve core assembly and straighten and press it; start the second cylinder (201), the second cylinder (201) drives the turntable (204) to rotate around the axis of the base (202), the turntable cam groove generates thrust on the second roller (208) as the turntable rotates, the second roller (208) is fixedly connected to the riveting assembly, the second roller moves toward the position of the valve core assembly under the action of the thrust of the turntable cam groove and drives the riveting assembly to move toward the position of the valve core assembly to squeeze the valve core sleeve to complete the riveting; after the riveting is completed, the second cylinder (201) retracts, the cylinder drives the turntable (204) to rotate and drives the riveting assembly to open synchronously, take out the riveted workpiece, and install the front end valve core O-ring (304), so that the valve core assembly is pressed.

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