High-speed on-off valve spool press-fitting device and assembling method

Abstract

The application provides a high-speed switch valve spool press-fitting device and an assembling method.The device comprises a front-end spool press-fitting module and a spool assembly press-fitting module arranged in sequence on a high-speed switch valve spool press-fitting assembly line.The front-end spool press-fitting module is press-fitted in a manual clamping and pneumatic clamping manner, a cylinder rod is connected with a pressing rod, the pressing rod drives double clamping arms to clamp the front-end spool, the pressing rod pushes the valve cap to move downwards and is bent; the spool assembly press-fitting module is a four-jaw riveting structure, press-fitting is completed in a manual clamping and pneumatic riveting manner, a cylinder rod is connected with a rotating disc through a rotating shaft, a riveting cutter head is connected with a sliding block through bolts, the rotating disc drives the sliding block and the cutter head to move along a track, and riveting of a sleeve of a spool assembly is completed. The clamping and press-fitting of the device are independent actions, the operation is simple and efficient, safe and reliable, and the high-speed switch valve spool structure with small size and high fitting precision can be efficiently and reliably press-fitted.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of digital electro-hydraulic, and relates to a valve core pressing device and a method for assembling a high-speed on-off valve. BACKGROUND

[0002] In a digital electro-hydraulic system, especially in the field of engineering machinery, a high-speed on-off valve plays a very important role, has the characteristics of small size, high control precision and rapid response, and is often applied to proportional control of a multi-way valve of engineering machinery.

[0003] The valve core of the high-speed on-off valve has a compact structure, a small size, high matching precision and multiple riveting points, and is manually organized in the prior art. However, the traditional manual pressing assembly is difficult and the pressing quality is uncontrollable, and phenomena such as pressing deviation, deformation, irregular bending and insecure pressing often occur. Therefore, it is particularly important to develop a high-efficiency and reliable valve core pressing device. SUMMARY

[0004] In order to overcome the problems of small size of the valve core of the high-speed on-off valve, high assembly precision requirement and firm and reliable pressing riveting, the application develops a valve core pressing device and method for the high-speed on-off valve, adopts a two-station pressing process and a pneumatic pressing mode, and realizes reliable pressing of the valve core.

[0005] The application aims to realize the following technical scheme:

[0006] The application first provides a valve core pressing device for a high-speed on-off valve, which comprises a front-end valve core pressing module and a valve core assembly pressing module arranged in sequence on a pressing assembly line; the front-end valve core pressing module is used for pressing the front-end valve core of the high-speed on-off valve, and the valve core assembly pressing module is used for pressing a valve core assembly containing the front-end valve core.

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

[0008] The valve core assembly press-fitting module comprises a second cylinder, a base, a valve core assembly positioning seat, a rotating disc, a plurality of riveting and pressing assemblies, and a second roller, the second cylinder is connected with the rotating disc for driving the rotating disc to rotate, the rotating disc is arranged in the base and connected with the base through a rotating shaft sleeve; the valve core assembly positioning seat is located at the center of the base for positioning a valve core assembly to be press-fitted; a plurality of cam grooves are uniformly arranged on the rotating disc in the circumferential direction, one second roller is arranged in each cam groove, the rotating disc cam groove can generate a pushing force on the second roller when the rotating disc rotates, the second roller is fixedly connected with the riveting and pressing assembly, and the second roller moves to the position of the valve core assembly under the action of the pushing force of the rotating disc cam groove and drives the riveting and pressing assembly to move to the position of the valve core assembly to press and extrude the valve core sleeve, thereby completing riveting and pressing.

[0009] The application further provides a press-fitting method based on the high-speed switch valve valve core press-fitting device.

[0010] The valve body, ball core and valve cap of the high-speed switch valve to be assembled are placed in the positioning hole of the valve core positioning seat from bottom to top; the valve core positioning seat is centered with the pressing rod; the first cylinder is started, thereby driving the pressing rod to move downward, when the conical structure at the end of the pressing rod acts on the first roller connected to the top of the clamping arm, the bottom end of the clamping arm swings inward, when the main body of the pressing rod is inserted between the first rollers, the clamping arm completely clamps the valve core; the first cylinder drives the pressing rod to continue to press downward, the valve cap is contracted along the tapered surface of the clamping jaw under the action of the pressing rod, and the bending is completed; after the assembly is completed, the first cylinder is retracted, the clamping arm is completely opened under the action of the spring, and the press-fitted front-end valve core is taken out.

[0011] The parts of the valve core assembly are assembled in sequence and placed in the positioning hole of the valve core assembly positioning seat; the centralizing cylinder sleeve is pressed and centralized with the top of the valve core assembly; the second cylinder is started, the second cylinder drives the rotating disc to rotate around the axis of the base, the rotating disc cam groove generates a pushing force on the second roller when the rotating disc rotates, the second roller is fixedly connected with the riveting and pressing assembly, and the second roller moves to the position of the valve core assembly under the action of the pushing force of the rotating disc cam groove and drives the riveting and pressing assembly to move to the position of the valve core assembly to press and extrude the valve core sleeve, thereby completing riveting and pressing; after the riveting and pressing are completed, the second cylinder is retracted, the cylinder drives the rotating disc to rotate and drives the riveting and pressing assembly to open synchronously, the riveted workpiece is taken out, the front-end valve core O-ring is assembled, and the press-fitting of the valve core assembly is completed.

[0012] Compared with the prior art, the actual pressing requirement of the high-speed on-off valve is considered, and the pressing process is divided into front-end valve core pressing and valve core assembly pressing two sections. In the front-end valve core pressing process, the taper design of the end of the pressing rod is used, so that the clamping arm can gradually clamp the front-end valve core during the pressing rod pressing process, and the valve cap can be bent along the clamping jaw surface of the clamping arm when the pressing rod acts on the valve cap, thereby completing the pressing. In the valve core assembly pressing process, the valve core assembly pressing module is a four-jaw riveting structure, which adopts manual clamping and pneumatic riveting to complete the pressing. The cylinder rod and the turntable are connected through the shaft, and the riveting tool head and the sliding block are connected through the bolt. The turntable drives the sliding block and the tool head to move along the track, and completes the riveting of the valve core assembly sleeve. The clamping and pressing of the device are independent actions, which is simple, efficient, safe and reliable, and can realize the efficient and reliable pressing of the valve core structure of the high-speed on-off valve with small size and high fitting precision. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 The structure schematic diagram of the high-speed on-off valve core pressing device is shown in the figure.

[0014] Figure 2 The structure schematic diagram of the front-end valve core pressing module of the high-speed on-off valve is shown in the figure.

[0015] Figure 3 The structure schematic diagram of the valve core assembly pressing module of the high-speed on-off valve is shown in the figure.

[0016] Figure 4 The front-end valve core is shown in the figure.

[0017] Figure 5 The valve core assembly is shown in the figure.

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

[0019] The application will be further described below in conjunction with the drawings and through specific embodiments.

[0020] As Figure 4The diagram shows the structure of the front valve core of the high-speed switching valve to be press-fitted according to an embodiment of the present invention. The front valve core of the high-speed switching valve includes, from bottom to top, a valve body 301, a ball core 302, and a valve cap 303. The purpose of pressing the front valve core is to press the valve core into the valve body 301 and to encapsulate the valve core with the valve cap 303. The encapsulation is mainly achieved by bending the edge of the valve cap 303 inward along the gap between the clamp and the valve body 301 during the pressing process, thereby cooperating with the valve body 301 to achieve a tight fit. Figure 4 and Figure 5 All dimensions marked in the figure are in mm, which shows that the high-speed switching valve has a compact structure and small size.

[0021] like Figure 5 The diagram shown is a structural schematic of the high-speed switching valve core assembly to be press-fitted in this 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 relatively long, while the radial dimension is relatively short. If the components are misaligned during press-fitting, press-fitting accuracy problems will occur, leading to defective products during verification.

[0022] Based on this, such as Figures 1-3 As shown, this embodiment of the invention provides a high-speed switching valve core pressing device. The device includes a front-end valve core pressing module 001 and a valve core assembly pressing module 002, sequentially arranged on a pressing production line. The front-end valve core pressing module 001 is used for pressing the front-end valve core of the high-speed switching valve, and the valve core assembly pressing module 002 is used for pressing the valve core assembly, including the front-end valve core.

[0023] like Figure 2 As shown, the front-end valve core pressing 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; a clamping arm 105 mounting seat is provided at the lower end of the guide sleeve 102, and the two sides of the clamping arm 105 mounting seat are respectively connected to two symmetrically arranged clamping arms 105 via rotating shafts. The valve body 301 is hinged in the middle. The two first rollers 106 are each 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 action of the spring 107, the two first rollers 106 are kept in contact with the end of the pressure rod 104. The end of the pressure rod 104 is a tapered structure. During the pressing down of the pressure rod 104, the tapered position will push the two first rollers 106 outward, so that the bottom of the two clamping arms 105 swings around the rotating shaft and clamps the valve body 301. After clamping, the first cylinder 101 drives the pressure rod 104 to continue to press down.

[0024] The valve core positioning seat 103 is located below the guide sleeve 102. The valve core positioning seat 103 is provided with a positioning hole coaxial with the pressure rod 104. Before pressing, the valve body 301, ball core 302 and valve cap 303 of the front valve core to be assembled are placed in the positioning hole from bottom to top. During pressing, the pressure rod 104 pushes the valve cap 303 downward to be assembled.

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

[0026] In a specific embodiment of the present invention, the end of the clamping arm 105 is a gripper with a guide surface. The gripper holds the valve cap 303. When the pressure rod 104 presses down and acts on the valve cap 303, the valve cap 303 is bent inward along the guide surface of the gripper to complete the bending process during the press-fitting process. The guide surface can be a protrusion or a slope on the gripper, and its specific shape is set according to the structure of the valve body 301. The purpose is to ensure that the valve cap 303 is completely bent inward during the downward movement, thereby securing it to the valve body 301.

[0027] In a specific embodiment of the present invention, the valve core assembly press-fit module 002 includes a second cylinder 201, a base 202, a valve core assembly positioning seat 203, a turntable 204, multiple sets of riveting components, 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 disposed in the base 202 and connected to the base 202 through a rotating bushing. The valve core assembly positioning seat 203 is located at the center of the base 202 to position the valve core assembly to be press-fitted. The turntable 204 is provided with multiple cam grooves evenly distributed along its circumference. Each cam groove is provided with a second roller 208. The cam grooves of the turntable 204 can generate a thrust on the second roller 208 as the turntable 204 rotates. The second roller 208 is fixedly connected to the riveting components. Under the action of the thrust of the cam grooves of the turntable 204, the second roller 208 moves towards the valve core assembly position and drives the riveting components to move towards the valve core assembly position to compress the valve core sleeve and complete the riveting.

[0028] Preferably, the valve core assembly positioning seat 203 has positioning holes. Before pressing the valve core assembly, each component of the valve core assembly is sequentially placed into the positioning holes. The valve core assembly pressing module 002 also includes a straightening cylinder 209. After placing each component of the valve core assembly into the positioning holes, the straightening cylinder 209 is fitted around the valve core assembly to straighten it. The straightening cylinder 209 is a hollow cylinder with an L-shaped bottom to ensure its stability. The inner diameter of the straightening cylinder 209 is equal to the maximum outer diameter of the high-speed switching valve to be pressed, ensuring that the front valve core, valve stem, and rear valve seat to be pressed can be vertically positioned.

[0029] Preferably, the number of riveting assemblies is not less than 3 sets; the riveting assembly includes 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. Under the action of the cam groove of the turntable 204, the first roller 106 moves towards the valve core assembly position and drives the slider 206 and the cutter head 207 to move along the slideway towards the valve core assembly position. 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 components is 4 sets, evenly arranged at 90 degrees. The turntable and the base are connected by a rotating bushing, with precise fit. The cutter head and the slider move along the slide seat to ensure that the 4 cutter heads are clamped and riveted synchronously. The valve core structure at the front end of the high-speed switching valve is compact and small in size, and a single valve core needs 3 riveting points. Traditional manual pressing assembly is difficult and the pressing quality is uncontrollable, often resulting in problems such as uneven pressing, deformation, irregular bending, and insecure pressing. The present invention adopts a pneumatic pressing method, which can complete the riveting of 3 riveting points at one time, significantly improving the yield and pressing efficiency.

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

[0032] Place the valve body 301, ball core 302, and valve cap 303 of the high-speed switching 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; activate the first cylinder 101 to drive the pressure rod 104 to move downwards. When the tapered 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 inwards. 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 pressing down, and the valve cap 303 retracts along the tapered surface of the clamping claw under the action of the pressure rod 104 to complete the bending; after assembly, the first cylinder 101 retracts, and the clamping arm 105 is fully opened under the action of the spring 107, and the press-fitted front valve core is removed.

[0033] Assemble the valve core assembly components in sequence and place them into the positioning holes of the valve core assembly positioning seat 203; fit the straightening cylinder 209 onto the top of the valve core assembly and straighten and press it tightly; start the second cylinder 201, which 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 and generates a thrust on the second roller 208. 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 towards the valve core assembly and drives the riveting assembly to move towards the valve core assembly, pressing 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, remove the riveted workpiece, and install the front valve core OO ring 304. At this point, the valve core assembly press-fitting is completed.

[0034] In one specific embodiment of the present invention, the front valve core pressing module 001 is pressed using a combination of manual clamping and pneumatic pressing. The cylinder rod is connected to the pressing rod 104, which drives the double clamping arms 105 to clamp the front valve core. The pressing rod 104 also pushes the valve cap 303 downwards to complete the bending. The valve core assembly pressing module 002 is a four-jaw riveting structure, and is pressed using a combination of manual clamping and pneumatic riveting. The front valve core of the high-speed switching valve has a compact structure and small size, making traditional manual pressing assembly difficult and resulting in uncontrollable pressing quality, often leading to issues such as misalignment, deformation, irregular bending, and insecure pressing. The present invention uses a pneumatic pressing method, achieving one-time molding and significantly improving the yield and pressing efficiency.

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

[0036] The embodiments described above are merely illustrative of specific implementations of the present invention and are described in detail, but they should not be construed as limiting the scope of the present invention. Those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the protection scope of the present invention.

Claims

1. A high-speed switching valve press-fitting method based on a high-speed switching valve core press-fitting device, characterized in that, The high-speed switching valve core pressing device includes a front-end valve core pressing module (001) and a valve core assembly pressing module (002) arranged sequentially on the pressing production line; wherein, the front-end valve core pressing module (001) is used for pressing the front-end valve core of the high-speed switching valve, and the valve core assembly pressing module (002) is used for pressing the valve core assembly including the front-end valve core. The front-end valve core pressing 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 is connected to the pressure rod, which is vertically arranged and coaxially with the valve core positioning seat; the pressure rod passes through the guide sleeve; a clamping arm mounting seat is provided at the lower end of the guide sleeve, and the two sides of the clamping arm mounting seat are respectively hinged to the middle of two symmetrically arranged clamping arms through a rotating shaft; the two first rollers are each connected to the top of the two clamping arms through a rotating shaft. The shaft is connected, and the spring is set in the clamping arm mounting seat. Under the action of the spring force, the two first rollers are kept in contact with the end of the pressure rod. The end of the pressure rod is a tapered structure. During the pressing of the pressure rod, the tapered position will push the two first rollers outward, so that the bottom of the two clamping arms swings around the shaft and clamps the valve body. After clamping, the first cylinder drives the pressure rod to continue pressing down. The end of the clamping arm (105) is a claw. The claw is provided with a guide surface. The tapered guide surface of the claw holds the valve cap. When the pressure rod presses down and acts on the valve cap, the valve cap shrinks along the guide surface of the claw under the action of the pressure rod to complete the bending. The valve core assembly press-fit module (002) includes a second cylinder (201), a base (202), a valve core assembly positioning seat (203), a turntable (204), multiple riveting components, and a second roller (208). The second cylinder is connected to the turntable to drive the turntable to rotate. The turntable is set inside the base and connected to the base through a rotating bushing. The valve core assembly positioning seat (203) is located at the center of the base to position the valve core assembly to be press-fitted. Multiple cam grooves are evenly provided on the turntable along the circumference. A second roller (208) is provided in each cam groove. The cam groove of the turntable can generate a thrust on the second roller (208) as the turntable rotates. The second roller (208) is fixedly connected to the riveting components. Under the action of the thrust of the cam groove of the turntable, the second roller moves towards the valve core assembly position and drives the riveting components to move towards the valve core assembly position to squeeze the valve core sleeve to complete the riveting. The high-speed switching valve press-fitting method includes the following steps: Place the valve body (301), ball core (302), and valve cap (303) of the high-speed switching valve to be assembled into the positioning hole of the valve core positioning seat (103) from bottom to top; align the valve core positioning seat (103) with the pressure rod; start the first cylinder (101) to drive the pressure rod (104) to move downward. When the tapered 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. When the main body of the pressure rod is inserted between the first rollers, the clamping arm fully clamps the valve core; the first cylinder drives the pressure rod to continue pressing down, and the valve cap contracts along the tapered surface of the clamping claw under the action of the pressure rod to complete the bending; after assembly, the first cylinder (101) retracts, and the clamping arm (105) is fully opened under the action of the spring (107) to remove the press-fitted front valve core; Assemble the valve core assembly parts in sequence and place them into the positioning holes of the valve core assembly positioning seat (203); fit the straightening sleeve (209) onto the top of the valve core assembly and straighten and press it tightly; 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 a 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 towards the valve core assembly position under the action of the turntable cam groove thrust and drives the riveting assembly to move towards the valve core assembly position 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 valve core O-ring (304), so that the valve core assembly press-fit is completed.

2. The high-speed switching valve press-fitting method according to claim 1, characterized in that, The valve core positioning seat (103) is located below the guide sleeve (102), and the valve core positioning seat (103) is provided with a positioning hole coaxial with the pressure rod. Before pressing, the valve body (301), ball core (302) and valve cap (303) of the front valve core to be assembled are placed in the positioning hole from bottom to top. During pressing, the pressure rod pushes the valve cap to move downward for assembly.

3. The high-speed switching valve press-fitting method according to claim 1, characterized in that, The middle part of the clamping arm mounting base has space for the pressure rod (104) to pass through when it is pressed down; the two clamping arms are symmetrically arranged about the vertical center line of the clamping arm mounting base.

4. The high-speed switching valve press-fitting method according to claim 1, characterized in that, The valve core assembly positioning seat (203) has a positioning hole. Before pressing the valve core assembly, each part of the valve core assembly is placed into the positioning hole in sequence. The valve core assembly pressing module also includes a straightening cylinder (209). After placing each part of the valve core assembly into the positioning hole, the straightening cylinder (209) is fitted around the valve core assembly to straighten it.

5. The high-speed switching valve press-fitting method according to claim 1, characterized in that, The number of riveting components is not less than 3 sets; the riveting components 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. Under the action of the turntable cam groove thrust, the first roller moves towards the valve core assembly position and drives the slider (206) and the cutter head (207) to move along the slideway towards the valve core assembly position. The cutter head squeezes the valve core sleeve to complete the riveting.

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