Dismounting device and method for hydraulic valve sleeve

Abstract

The invention belongs to the technical field of hydraulic systems, and discloses a hydraulic valve sleeve dismounting device and method.The device comprises two connecting claws, a sleeve, a threaded rod, a handle, a traction nut, a pin shaft and a connecting piece, the two connecting claws are axially connected to one end of the connecting piece, and a lug fork structure is arranged at the front end of the threaded rod; the connecting piece is arranged in a lug fork structure at the front end of the screw rod through a pin shaft, the sleeve is arranged outside the screw rod, the connecting piece and the connecting claw, the screw rod extends out of the rear end of the sleeve, and a traction nut and a handle are arranged outside the part, extending out of the rear end of the sleeve, of the screw rod. The coaxiality of the valve sleeve and the valve sleeve mounting hole in the dismounting process is guaranteed, and clamping stagnation or shell damage caused by deflection in the valve sleeve dismounting process is avoided; and through the guide hole and the chamfer on the sleeve, the sealing element can smoothly pass through, and the sealing element is prevented from being damaged due to the sharp edge of the part in the dismounting process.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic system technology and relates to a device and method for disassembling hydraulic valve sleeves. Background Technology

[0002] Hydraulic spool valves are widely used inside hydraulic products to switch oil circuits. To isolate the various oil circuits on the housing, the clearance between the hydraulic valve sleeve and the mating hole is small, and multiple sealing grooves are formed on the outer circumference of the valve sleeve, with seals installed within these grooves. After the valve sleeve is installed inside the housing, the friction between the seals and the inner bore of the housing, especially in complex spool valves with numerous seals, results in significant friction between the valve sleeve and the inner bore of the housing, making disassembly difficult. Furthermore, due to the small clearance between the valve sleeve and the housing bore, if the valve sleeve deflects during disassembly, it can easily damage the inner bore of the housing, affecting the seal after reassembly. In severe cases, this can render the complex, high-precision, and costly housing parts unusable.

[0003] Currently, valve sleeves with simple oil circuits, short dimensions, and few seals can be disassembled using expansion clamps. The clamps are inserted into the valve sleeve's inner bore, and their expansion is used to secure the valve sleeve to the clamps through friction, allowing it to be pulled out. This method is only suitable for situations where the friction between the valve sleeve and the housing is low, and it can easily damage the valve sleeve's inner bore. For valve sleeves with more complex oil circuits, longer dimensions, and more seals, the housing mounting hole is often designed as a through hole. The valve sleeve is then pressed out using a press and auxiliary tools. This method requires additional parts, increasing the complexity and volume of the housing. In applications with high requirements for product size, weight, and envelope shape (such as airborne equipment), this presents design challenges. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides a device and method for disassembling hydraulic valve sleeves, taking into account the coaxiality of the valve sleeve and its mounting hole during disassembly, thereby preventing the valve sleeve from deflecting during disassembly and causing jamming or damage to the housing.

[0005] The technical solution of the present invention is as follows: A hydraulic valve sleeve disassembly device includes two connecting claws, a sleeve, a screw, a handle, a traction nut, a pin, and a connector. The two connecting claws are axially connected to one end of the connector. The front end of the screw is provided with an ear fork structure. The connector is installed in the ear fork structure at the front end of the screw through the pin. The sleeve is located outside the screw, connector, and connecting claws. The screw extends from the rear end of the sleeve. The portion of the screw extending from the rear end of the sleeve is provided with a traction nut and a handle.

[0006] Furthermore, the front end of the sleeve has an external thread, and the shape of the front end of the sleeve is consistent with the external thread and the shape of the screw cap at the middle end of the hydraulic valve to be disassembled is consistent with the external thread.

[0007] Furthermore, after the connector is inserted into the lug structure at the front end of the screw, there is a radial gap between the connector and the lug structure.

[0008] Furthermore, the front end of the connecting claw is provided with a pin facing radially upward or downward, and the pin matches the mounting hole on the inner wall of the valve sleeve to be disassembled.

[0009] Furthermore, the connector has a waist-shaped hole in the radial direction that mates with the pin. The pin can move perpendicular to the center line of the screw within the waist-shaped hole. At the same time, the connector and the screw can rotate through the pin to compensate for the coaxiality error between the screw and the valve sleeve.

[0010] Furthermore, a long groove is provided on the side of the sleeve, which is used to install the pin and connecting parts, and to observe the position of the valve sleeve during disassembly.

[0011] Furthermore, the sleeve has a stepped hole, in which the small inner hole near the front end has a small diameter, the same as the diameter of the mounting hole 11a of the valve sleeve 10 inside the housing 11, and the large inner hole near the rear end has a large diameter. There is a first chamfer transition between the small inner hole and the large inner hole, and the end face of the small inner hole is provided with a second chamfer. The junction of the first chamfer and the second chamfer is rounded.

[0012] A method for disassembling a hydraulic valve sleeve, using the aforementioned hydraulic valve sleeve disassembly device, includes the following steps: S1. Unscrew the cap on the housing, remove the spring, valve core and spring seat, and clean the oil. S2, Install the two connecting claws into position with the valve sleeve, and then connect the two connecting claws to the connector; S3, connect the handle to the traction nut, screw the traction nut onto the screw rod, and then screw the whole thing into the inner hole of the sleeve; S4, place the sleeve over the outside of the connector and the exposed connecting claw, and connect the screw and the connector; S5, screw the sleeve into the mounting hole of the screw cap on the housing; S6, rotate the handle, and the screw drives the valve sleeve to move out of the housing through the pin, connector, and connecting claw.

[0013] The advantages of this invention are as follows: 1. The present invention provides a disassembly device and method for a hydraulic valve sleeve, which converts and amplifies the torque of the handle into a pulling force on the valve sleeve through the threaded engagement of the sleeve and the traction nut; by installing the sleeve in the screw cap mounting hole on the housing, having a guide hole inside the sleeve, and the engagement of the connecting part and the pin being an oblong hole, the coaxiality of the valve sleeve and the valve sleeve mounting hole during disassembly is ensured, avoiding deflection during valve sleeve disassembly that could cause jamming or damage to the housing; the guide hole and chamfer on the sleeve enable the smooth passage of the seal, preventing the seal from being damaged by passing over the sharp edge of the part during disassembly.

[0014] 2. This invention has a simple and compact structure, facilitating engineering processing and installation. The connecting claw is connected to the valve sleeve using a pin at its end, and the connecting component is then installed on the connecting claw using screws. After assembling the sleeve, screw, and traction nut, the screw is installed on the connecting component using a lug structure on the screw, screws, and nuts. The sleeve is screwed into the mounting hole of the original screw cap on the housing. By rotating the handle or hexagonal structure, the valve sleeve is pulled out. During the pulling process, the position of the valve sleeve can be observed through the groove on the sleeve. This invention achieves the disassembly of a precision valve sleeve under high friction without the aid of complex structures or tools. The device is simple to install and operate, and is reliable. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall disassembly device for the hydraulic valve sleeve provided in an embodiment of the present invention.

[0017] Figure 2 A cross-sectional schematic diagram of a hydraulic valve sleeve disassembly device provided in an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the mounting structure of the screw, pin, connector, screw and connecting claw provided in an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the connecting claw structure provided in an embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram of the valve sleeve installation structure before disassembly, provided in an embodiment of the present invention.

[0021] Figure 6 This is a schematic diagram of the disassembly device, housing, and valve sleeve installation structure provided in an embodiment of the present invention.

[0022] Wherein: 1-connecting claw, 2-sleeve, 3-screw, 4-handle, 5-traction nut, 6-pin, 7-connector, 8-nut, 9-screw, 10-valve sleeve, 11-housing, 12-screw cap, 13-spring, 14-valve core, 15-spring seat; 1a-Pin; 2a-Long groove; 2b-Small inner hole; 2c-Large inner hole; 2d-First chamfer; 2e-Second chamfer; 3a-Fork lug; 3b-First hexagonal structure; 5a-Second hexagonal structure; 7a-Oval hole; 10a-Mounting hole. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0025] In the description of this invention, it should be noted that the directions or positional relationships indicated by terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing and simplifying the invention, and should not be construed as limiting the invention. Furthermore, the use of ordinal numbers (e.g., "first and second," etc.) is for distinguishing objects and is not limited to this order, and should not be construed as indicating or implying relative importance.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly, encompassing both direct connection and indirect connection via an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0027] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] First embodiment: A hydraulic valve sleeve disassembly device includes two connecting claws 1, a sleeve 2, a screw 3, a handle 4, a traction nut 5, a pin 6, and a connector 7. The two connecting claws 1 are axially connected to one end of the connector 7. The front end of the screw 3 is provided with an ear fork structure. The connector 7 is installed in the ear fork structure at the front end of the screw 3 through the pin 6. The sleeve 2 is located outside the screw 3, the connector 7, and the connecting claws 1. The screw 3 extends from the rear end of the sleeve 2. The portion of the screw 3 extending from the rear end of the sleeve 2 is provided with a traction nut 5 and a handle 4.

[0029] The front end of the sleeve 2 has an external thread, and the shape of the front end of the sleeve 2 is consistent with the external thread and the shape of the screw cap 12 at the middle end of the hydraulic valve to be disassembled is consistent with the external thread.

[0030] After the connector 7 is inserted into the lug structure at the front end of the screw 3, there is a radial gap between the connector 7 and the lug structure.

[0031] The front end of the connecting claw 1 is provided with a pin 1a facing radially upward or downward, and the pin 1a matches the mounting hole 10a on the inner wall of the valve sleeve 10 to be disassembled.

[0032] The connector 7 has a waist-shaped hole 7a in the radial direction that mates with the pin 6. The pin 6 can move perpendicular to the center line of the screw 3 within the waist-shaped hole 7a. At the same time, the connector 7 and the screw 3 can rotate through the pin 6 to compensate for the coaxiality error between the screw 3 and the valve sleeve 10.

[0033] The sleeve 2 has a long groove 2a on its side. The long groove 2a is used to install the pin 6 and the connector 7, and to observe the position of the valve sleeve 10 during disassembly.

[0034] The sleeve 2 has a stepped hole, where the small inner hole 2b near the front end has a small diameter, which is the same as the diameter of the valve sleeve 10 mounting hole 11a in the housing 11. The large inner hole 2c near the rear end has a large diameter. There is a first chamfer 2d between the small inner hole 2b and the large inner hole 2c. The end face of the small inner hole 2b is provided with a second chamfer 2e. The intersection of the first chamfer 2d and the second chamfer 2e is rounded.

[0035] A method for disassembling a hydraulic valve sleeve, using the aforementioned hydraulic valve sleeve disassembly device, includes the following steps: S1. Unscrew the screw cap 12 on the housing 11, remove the spring 13, valve core 14 and spring seat 15, and clean the oil. S2, install the two connecting claws 1 and valve sleeve 10 into place, and then connect the two connecting claws 1 and connector 7; S3, connect the handle 4 to the traction nut 5, screw the traction nut 5 onto the screw 3, and then screw the whole assembly into the inner hole of the sleeve 2; S4, sleeve 2 is placed on the outside of connector 7 and exposed connecting claw 1, and screw 3 and connector 7 are connected; S5, screw the sleeve 2 into the mounting hole of the screw cap 12 on the housing 11; S6, rotate handle 4, screw 3 drives valve sleeve 10 to move to the outside of housing 11 through pin 6, connector 7, and connecting claw 1.

[0036] Second embodiment: To address the problems in existing technologies, such as excessive friction in the valve sleeve leading to difficulty in disassembly, damage to the valve sleeve's inner bore caused by the use of expansion clamps, or increased product size and weight due to adaptive design of the housing, this invention provides a disassembly device and method for hydraulic valve sleeves. It considers the coaxiality issue between the valve sleeve and the valve sleeve mounting hole during disassembly, preventing deflection during disassembly that could cause jamming or damage to the housing; and it considers the issue of the seal passing over the edge of the component, preventing damage to the seal during disassembly.

[0037] Please see Figure 1-6 The hydraulic valve sleeve disassembly device involved in this invention is generally as follows: Figure 1 As shown, the sectional view is as follows Figure 2 As shown, Figure 3 As shown Figure 2 Schematic diagram of the installation structure of the central screw, pin, connector, screw, and connecting claw. Figure 4 As shown Figure 1 , Figure 2 Schematic diagram of the connecting claw structure. Figure 5 The diagram shown is a schematic of the valve sleeve installation structure before disassembly. Figure 6 The diagram shows the installation structure of the disassembly device, housing, and valve sleeve.

[0038] Among them, the connecting claw 1 is connected to the valve sleeve 10, and transmits the tension of the screw 3 to the valve sleeve 10; The end of the screw 3 has an ear fork structure, which is connected to the connector 7 through the pin 6 and nut 8. The outer circle of the screw 3 has a threaded structure, which is engaged with the internal thread of the traction nut 5. Each of the two connecting claws 1 is connected to the connector by a screw 9; The two handles 4 are connected to the traction nut 5; The sleeve has a countersunk hole 2f at the end away from the housing, and a traction nut 5 is installed inside it. The inner hole of the traction nut 5 is threaded and mates with the external thread on the screw 3.

[0039] In the embodiments of this application, such as Figure 3As shown, the end face of the connecting claw 1 has a screw hole, and each of the two connecting claws 1 is connected to the connecting piece 7 by a screw 9. The lug 3a of the screw 3 has a mounting hole. The connecting piece 7 is connected to the lug 3a by a pin 6 and a nut 8. The connecting piece 7 is provided with a waist-shaped hole 7a that mates with the pin 6. The pin 6 can move perpendicular to the center line of the screw 3 within the waist-shaped hole 7a. At the same time, the connecting piece 7 and the screw 3 can rotate through the pin 6 to compensate for the coaxiality error between the screw 3 and the hydraulic valve sleeve 10.

[0040] In the embodiments of this application, such as Figure 1 , Figure 2 , Figure 3 As shown, the sleeve 2 has symmetrical grooves 2a. The pin 6, connector 7 and nut 8 are installed using the grooves 2a, and the position of the valve sleeve during disassembly is observed.

[0041] In the embodiments of this application, such as Figure 4 , Figure 5 , Figure 6 As shown, a pin 1a is installed at one end of the connecting claw 1. The pin 1a can be inserted into the mounting hole 10a on the wall of the valve sleeve 10 to connect the connecting claw 1 to the valve sleeve 10.

[0042] In the embodiments of this application, such as Figure 2 , Figure 6 As shown, the sleeve 2 has a stepped hole. The inner hole 2b near the end of the housing 11 is smaller and its diameter is the same as the diameter of the valve sleeve 10 mounting hole 11a in the housing 11. The larger inner hole 2c away from the housing 11 has a chamfer 2d transition between it and the inner hole 2b. The end face of the inner hole 2b is provided with a chamfer 2e, and the intersection of the two chamfers is rounded to prevent the seal on the valve sleeve 10 from being damaged by the sharp edge of the part when it is pulled out.

[0043] In the embodiments of this application, such as Figure 6 As shown, when the handle 4 is rotated, the torque applied to the screw 3 by the handle 4 through the traction nut 5 is converted and amplified into the pulling force of the screw 3 on the connecting claw 1, thereby pulling the valve sleeve 10 out of the housing mounting hole. The valve sleeve 10 is guided inside the sleeve 2 through the inner hole 2b until it is completely removed from the housing.

[0044] In the embodiments of this application, such as Figure 1 As shown, if the valve sleeve 2 is too difficult to disassemble and the handle 4 is difficult to pull, a wrench can be used to increase the pulling force by interlocking the hexagonal structure 3b on the screw 3 and the hexagonal structure 5a on the traction nut 5.

[0045] See Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6 The disassembly method includes the following steps: Step 1: Unscrew the cap 12 on the housing 11, remove the spring 13, valve core 14, and spring seat 15, and clean up the leaked oil.

[0046] Step 2: Insert the two connecting claws 1 into the pin hole 10a on the valve sleeve 10 through the pin 1a; connect the two connecting claws 1 to the connector 7 through the screw 9.

[0047] Step 3: Connect the handle 4 to the traction nut 5, screw the traction nut 5 onto the screw rod 3, and then screw the whole assembly into the inner hole of the sleeve 2.

[0048] Step 4: Place the sleeve 2 on the outside of the screw 9, connector 7, and exposed connecting claw 1. Use the groove 2a on the sleeve 2 to observe the angle of the ear fork 3a on the screw 3, and adjust the angle of the ear fork 3a by rotating the handle 4. Pass the ear fork 3a through the connector 7, and then pass the pin 6 through the ear fork 3a and the connector 7, and fix it with the nut 8.

[0049] Step 5: Screw the sleeve 2 into the mounting hole of the screw cap 12 on the housing 11.

[0050] Step 6: Slowly rotate handle 4. The screw 3, through pin 6, connector 7, and connecting claw 1, drives valve sleeve 10 to move outward from housing 11. The position of valve sleeve 10 can be observed through groove 2a on sleeve 2. If manually rotating the handle cannot overcome the friction between valve sleeve 10 and housing 11, use one wrench to hold the hexagonal structure 5a at the end of the traction nut 5 and another wrench to hold the hexagonal structure 3b at the end of the screw 3. Tighten the two wrenches together to increase the pulling force on valve sleeve 10.

[0051] This invention discloses a disassembly device and method for a hydraulic valve sleeve. Utilizing a pre-drilled pin hole 10a on the valve sleeve 10, the torque of a handle 4 or wrench is converted and amplified into the pulling force of a screw 3 via a threaded connection. This pulling force is then transmitted to the valve sleeve through a pin 6, a connector 7, and a claw 1, providing a large pulling force to the valve sleeve 2 using a simple device. By fixing the sleeve 2 into a screw cap 12 mounting hole on the housing 11, coaxial with the valve sleeve 10 mounting hole, and with a guide hole inside the sleeve 2 and a waist-shaped groove 7a on the connector 7, the direction of the pulling force is made coaxial with the valve sleeve 10, preventing the valve sleeve 10 from deflecting during disassembly and causing jamming or damage to the housing 11. The sleeve 2 also features guide chamfers 2d and 2e to prevent damage to the seals on the valve sleeve 10 when pulled out, thus simplifying the design of the hydraulic product housing and related components, resulting in a smaller volume, smaller envelope, and lighter weight.

[0052] The above detailed embodiments are a description of the present invention. It should not be considered that the specific embodiments of the present invention are limited to these descriptions. For those skilled in the art, several simple deductions and substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the protection scope of the present invention.

Claims

1. A device for disassembling a hydraulic valve sleeve, characterized in that, It includes two connecting claws (1), a sleeve (2), a screw (3), a handle (4), a traction nut (5), a pin (6), and a connector (7). The two connecting claws (1) are axially connected to one end of the connector (7). The front end of the screw (3) is provided with an ear fork structure. The connector (7) is installed in the ear fork structure at the front end of the screw (3) through the pin (6). The sleeve (2) is located outside the screw (3), the connector (7), and the connecting claws (1). The screw (3) extends from the rear end of the sleeve (2). The part of the screw (3) extending from the rear end of the sleeve (2) is provided with a traction nut (5) and a handle (4).

2. The hydraulic valve sleeve disassembly device according to claim 1, characterized in that, The front end of the sleeve (2) has an external thread, and the shape of the front end of the sleeve (2) is consistent with the external thread and the shape of the screw cap (12) at the middle end of the hydraulic valve to be disassembled is consistent with the external thread.

3. The hydraulic valve sleeve disassembly device according to claim 1, characterized in that, After the connector (7) is inserted into the ear fork structure at the front end of the screw (3), there is a radial gap between the connector (7) and the ear fork structure.

4. The hydraulic valve sleeve disassembly device according to claim 1, characterized in that, The front end of the connecting claw (1) is provided with a pin (1a) facing radially upward or downward, and the pin (1a) matches the mounting hole (10a) on the inner wall of the valve sleeve (10) to be disassembled.

5. The hydraulic valve sleeve disassembly device according to claim 1, characterized in that, The connector (7) has a waist-shaped hole (7a) in the radial direction that mates with the pin (6). The pin (6) can move perpendicular to the center line of the screw (3) within the waist-shaped hole (7a). At the same time, the connector (7) and the screw (3) can rotate through the pin (6) to compensate for the coaxiality error between the screw (3) and the valve sleeve (10).

6. The hydraulic valve sleeve disassembly device according to claim 1, characterized in that, The sleeve (2) has a long groove (2a) on its side. The long groove (2a) is used to install the pin (6) and the connector (7) and to observe the position of the valve sleeve (10) during disassembly.

7. The hydraulic valve sleeve disassembly device according to claim 1, characterized in that, The sleeve (2) has a stepped hole. The small inner hole (2b) near the front end has a small diameter, which is the same as the diameter of the valve sleeve 10 mounting hole 11a in the housing 11. The large inner hole (2c) near the rear end has a large diameter. There is a first chamfer (2d) between the small inner hole (2b) and the large inner hole (2c). The end face of the small inner hole (2b) is provided with a second chamfer (2e). The intersection of the first chamfer (2d) and the second chamfer (2e) is rounded.

8. A method for disassembling a hydraulic valve sleeve, using a hydraulic valve sleeve disassembly device as described in any one of claims 1-7, characterized in that, Includes the following steps: S1, unscrew the screw cap (12) on the housing (11), remove the spring (13), valve core (14) and spring seat (15), and clean the oil; S2, install the two connecting claws (1) into position with the valve sleeve (10), and then connect the two connecting claws (1) to the connector (7); S3, connect the handle (4) to the traction nut (5), screw the traction nut (5) onto the screw (3), and then screw the whole assembly into the inner hole of the sleeve (2); S4, put the sleeve (2) on the outside of the connector (7) and the exposed connecting claw (1), and connect the screw (3) and the connector (7). S5, screw the sleeve (2) into the mounting hole of the screw cap (12) on the housing (11); S6, rotate the handle (4), the screw (3) drives the valve sleeve (10) to move to the outside of the housing (11) through the pin (6), connector (7) and connecting claw (1).

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