Three-way hydraulic lock device

Abstract

The utility model relates to a three-way hydraulic lock device which structurally comprises a lock body, a fusiform piston and a one-way valve. Two fusiform pistons are connected in the lock body in a sliding mode, and trigger rods are arranged at the outer ends of the fusiform pistons and make contact with the opening portion of an inlet of the one-way valve to control the one-way valve to be opened; the inner end part of the fusiform piston is a circular truncated cone or a cylinder with a reduced diameter, the end surfaces of the circular truncated cone or the cylinder are in contact fit, and an inner cavity is formed in the middle of the lock body; the lock body is provided with six oil inlet and outlet holes, namely a hole A, a hole B, a hole C, a hole D, a hole E and a hole F; and the six oil inlet and outlet holes are divided into three groups and are respectively communicated with the left, middle and right inner cavities of the lock body. The three-way hydraulic lock device meets the locking requirement of the single-cylinder-body double-stroke oil cylinder in the stroke range, and is small in size and high in stability.

Description

Technical Field

[0001] The utility model relates to a three-way hydraulic locking device, belonging to the technical field of hydraulic accessories. Background Art

[0002] In hydraulic control components, the two-way hydraulic lock is a key component for fixing the stroke of the cylinder. Usually, each cylinder is equipped with a two-way hydraulic lock to achieve locking at any position within the cylinder stroke to meet the position requirements of the related connection mechanism. The two-way hydraulic lock is only applicable to single-stroke cylinders, that is, the two inlet and outlet ports of the cylinder are connected to the two outlets of the two-way hydraulic lock. For a single-cylinder double-stroke cylinder, the cylinder has three inlet and outlet ports, and the two-way hydraulic lock cannot be used. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a three-way hydraulic locking device, which meets the locking requirements of a single-cylinder double-stroke oil cylinder within a stroke range and has not only a small size but also strong stability.

[0004] In order to solve the above problems, the specific technical scheme of the utility model is as follows: a three-way hydraulic lock device, including a lock body, a shuttle piston, and a one-way valve; a through hole is provided in the center of the lock body, and the two ends of the through hole are respectively sealed and connected to the one-way valve; there are two shuttle pistons, and they are symmetrically arranged with the center; the outer ends of the two shuttle pistons are provided with trigger rods, and the trigger rods are in contact with the opening part of the one-way valve inlet to control the opening of the one-way valve; the inner end of the shuttle piston is a frustum or a cylinder with a smaller diameter, and the end faces of the frustum or the cylinder are in contact and fit, and an inner cavity is formed in the middle of the lock body; six inlet and outlet oil holes are provided on the lock body, namely, hole A, hole B, hole C, hole D, hole E and hole F; hole A and hole D are a group and are located on the left side of the lock body, hole D is connected to the one-way valve outlet on the left, and hole A is connected to the cavity at the left end of the left lock body; hole C and hole F are a group and are located on the right side of the lock body, hole F is connected to the one-way valve outlet on the right, The C hole is communicated with the cavity at the right end of the lock body; the B holes and the E holes are a group and are located in the middle of the lock body, the B hole is communicated with the middle inner cavity of the lock body, and the E hole is provided with two branch holes, E1 hole and E2 hole. The E1 hole on the left is communicated with the middle inner cavity of the lock body when the left shuttle piston is in the left extreme position, and the E2 hole on the right is communicated with the middle inner cavity of the lock body when the right shuttle piston is in the right extreme position.

[0005] The outer circumference of the shuttle-shaped piston is matched with the inner surface of the lock body through hole in a sliding mechanical seal.

[0006] The one-way valve comprises a valve sleeve, a locking screw, a spring and a valve body; wherein the valve sleeve is threadedly sealed with a through hole of the lock body, an oil inlet is provided at the inner end of the valve sleeve, and the oil inlet corresponds to the position of the trigger rod; the locking screw is threadedly sealed with the outer end of the valve sleeve; the valve body is slidably connected with the inner cavity of the valve sleeve, the end of the valve body is supported by one end of the spring, and the other end of the spring is supported on the inner end face of the locking screw; a conical surface is provided on the end face of the valve body close to the oil inlet, and the conical surface is in sealing contact with the oil inlet; a plurality of radial small holes are provided on the outer periphery of the valve body, and the inner cavity of the valve body is communicated with the corresponding D hole or F hole through the radial small holes.

[0007] When one set of oil inlet and outlet holes is used as the oil supply pipeline, the other two sets of oil inlet and outlet holes are used as the oil return pipeline.

[0008] This application adopts the above structure, which has the following advantages:

[0009] 1. It can realize the sealed locking of hydraulic oil in three chambers of single-cylinder double-stroke oil cylinder, ensuring the stability of the position of the mechanism driven by the oil cylinder within the stroke range.

[0010] 2. The single-cylinder double-stroke cylinder has a compact axial structure and multiple strokes, and has significant advantages when used in mechanical devices. The three-way hydraulic lock provides strong support for the application of the single-cylinder double-stroke cylinder.

[0011] 3. The three-way hydraulic lock has small dimensions, low manufacturing cost, and is easy to install and use in a small space.

[0012] 4. The one-way valve in the three-way hydraulic lock adopts a cartridge structure, which is easy to maintain and service.

[0013] 5. The three-way hydraulic lock can be manufactured into a variety of import and export connection methods, which is convenient for use in different scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a three-way hydraulic locking device.

[0015] Figure 2 for Figure 1 A partial enlarged view of .

[0016] Figure 3 This is a locked state diagram of the three-way hydraulic locking device.

[0017] Figure 4 Working status diagram for injecting pressure oil into hole A.

[0018] Figure 5 Working status diagram for injecting pressure oil into hole B.

[0019] Figure 6 Working status diagram for injecting pressure oil into C hole. DETAILED DESCRIPTION

[0020] like Figure 1 As shown, a three-way hydraulic lock device comprises a lock body 1, a shuttle piston 2, and a one-way valve 3; a through hole is provided in the center of the lock body 1, and the two ends of the through hole are respectively sealed and connected to the one-way valve 3; there are two shuttle pistons 2, which are symmetrically arranged with the center, and the outer circumference of the shuttle piston 2 and the inner surface of the through hole of the lock body 1 are mechanically sealed and matched; the outer ends of the two shuttle pistons 2 are provided with trigger rods 21, and the trigger rods 21 contact the opening part of the inlet of the one-way valve 3 to control the opening of the one-way valve 3; the inner end of the shuttle piston 2 is a truncated cone or a cylinder with a smaller diameter, and the end faces of the truncated cone or the cylinder are in contact and matched, and an inner cavity is formed in the middle of the lock body 1; six inlet and outlet oil holes are provided on the lock body 1, namely, hole A, hole B, hole C, hole D, hole E and hole F; hole A and hole D are a group and are located on the left side of the lock body 1, hole D is connected to the outlet of the one-way valve 3 on the left side, and hole A is connected to the cavity at the left end of the left lock body 1; hole C and hole F are a group and are located on the right side of the lock body 1, The F hole is communicated with the outlet of the one-way valve 3 on the right side, and the C hole is communicated with the cavity at the right end of the lock body 1; the B hole and the E hole are a group and are located in the middle of the lock body 1, the B hole is communicated with the middle inner cavity of the lock body 1, and the E hole is provided with two branch holes E1 and E2. The E1 hole on the left side is communicated with the middle inner cavity of the lock body 1 when the left shuttle piston 2 is at the left extreme position, and the E2 hole on the right side is communicated with the middle inner cavity of the lock body 1 when the right shuttle piston 2 is at the right extreme position.

[0021] like Figure 2 As shown, the one-way valve 3 includes a valve sleeve 3-1, a locking screw plug 3-2, a spring 3-3 and a valve body 3-4; wherein the valve sleeve 3-1 is threadedly sealed with the through hole of the lock body 1, and an oil inlet 3-5 is provided at the inner end of the valve sleeve 3-1, and the oil inlet 3-5 corresponds to the position of the trigger rod 21; the locking screw plug 3-2 is threadedly sealed and connected at the outer end of the valve sleeve 3-1; the valve body 3-4 is slidably connected to the inner cavity of the valve sleeve 3-1, the end of the valve body 3-4 is supported by one end of the spring 3-3, and the other end of the spring 3-3 is supported on the inner end surface of the locking screw plug 3-2; a conical surface is provided on the end surface of the valve body 3-4 close to the oil inlet 3-5, and the conical surface is in sealing contact with the oil inlet 3-5; a plurality of radial small holes are provided on the outer periphery of the valve body 3-4, and the inner cavity of the valve body 3-4 is communicated with the corresponding D hole or F hole through the radial small holes. When the trigger rod 21 pushes the valve body 3 - 4 or the oil pressure overcomes the elastic force of the spring 3 - 3 to open the one-way valve 3 , the oil path connected to the one-way valve 3 is connected.

[0022] When one set of oil inlet and outlet holes is used as the oil supply pipeline, the other two sets of oil inlet and outlet holes are used as the oil return pipeline. The specific process is as follows: Figure 3 As shown, when there is no pressure oil in the A hole, B hole and C hole of the three-way hydraulic lock, the D hole, E hole and F hole of the three-way hydraulic lock respectively cut off three groups of hydraulic oil channels through the one-way valve 3 and the shuttle piston 2 on both sides, and the pistons of the connected single-cylinder double-stroke cylinders are in a locked state.

[0023] like Figure 4 As shown, when hydraulic oil enters hole A, the valve body 3-4 of the left-end one-way valve 3 moves to the left, opening the channel between hole A and hole D, and the hydraulic oil flows out from hole D and enters the left-end cavity of the single-cylinder double-stroke cylinder piston 1. At the same time, the hydraulic oil pushes the shuttle piston 2 to move right, opening the channel between hole B and hole E2, and pushes the valve body 3-4 of the right-end one-way valve 3 to move right, opening the channel between hole C and hole F, ensuring that the oil in the single-cylinder double-stroke cylinder cavity connected to holes E and F flows out, realizing that piston 1 pushes piston 2 to move right, and the maximum movement is the stroke of piston 1, realizing the first stroke of the single-cylinder double-stroke oil.

[0024] like Figure 5 As shown, when hydraulic oil enters hole B, the two shuttle pistons 2 move left and right respectively, pushing the valve body 3-4 of the left-end check valve 3 to move left and the valve body 3-4 of the right-end check valve 3 to move right respectively, and the three groups of channels are all opened, and the hydraulic oil flows from hole E into the right-end cavity of the single-cylinder double-stroke oil cylinder piston 1. At the same time, the oil in the left-end cavity of the single-cylinder double-stroke oil cylinder piston 1 and the right-end cavity of piston 2 flow out through the channel between hole A and hole D and the channel between hole C and hole F respectively, and the pressure oil pushes piston 1 to move left to the limit position, and pushes piston 2 to continue to move right until the maximum stroke of piston 2, realizing the second stroke of the single-cylinder double-stroke oil.

[0025] like Figure 6 As shown, when hydraulic oil enters C hole, the valve body 3-4 of the right-end one-way valve 3 moves to the right, opening the channel between C hole and F hole, and the hydraulic oil flows out from F hole and enters the right-end cavity of the single-cylinder double-stroke cylinder piston 2. At the same time, the hydraulic oil pushes the shuttle piston 2 to move left, opening the channel between B hole and E hole, and pushes the valve body 3-4 of the left-end one-way valve to move left, opening the channel between A hole and D hole, ensuring that the oil in the single-cylinder double-stroke cylinder cavity connected to D hole and E hole flows out, piston 1 moves left, piston 2 moves left, and the maximum movement is the stroke of piston 2, realizing the zero stroke state of the single-cylinder double-stroke cylinder.

Claims

1. A three-way hydraulic locking device, characterized in that: The invention comprises a lock body (1), a shuttle piston (2), and a one-way valve (3); a through hole is provided at the center of the lock body (1), and both ends of the through hole are respectively sealed and connected to the one-way valve (3); there are two shuttle pistons (2), which are arranged symmetrically with respect to the center; trigger rods (21) are provided at the outer ends of the two shuttle pistons (2), and the trigger rods (21) contact the opening part of the inlet of the one-way valve (3) to control the opening of the one-way valve (3); the inner end of the shuttle piston (2) is a truncated cone or a cylinder with a reduced diameter, and the end faces of the truncated cone or the cylinder are in contact and fit to form an inner cavity in the middle of the lock body (1); six oil inlet and outlet holes are provided on the lock body (1), namely, hole A, hole B, hole C, hole D, hole E, and hole F; holes A and D form a group and are located on the left side of the lock body (1), hole D communicates with the outlet of the one-way valve (3) on the left side, and hole A communicates with the cavity at the left end of the left lock body (1); holes C and F form a group and are located on the right side of the lock body (1), The F hole is communicated with the outlet of the one-way valve (3) on the right side, and the C hole is communicated with the cavity at the right end of the lock body (1); the B hole and the E hole are a group and are located in the middle of the lock body (1), the B hole is communicated with the middle inner cavity of the lock body (1), and the E hole is provided with two branch holes, the E1 hole and the E2 hole. When the left shuttle piston (2) is at the left extreme position, the E1 hole on the left side is communicated with the middle inner cavity of the lock body (1), and when the right shuttle piston (2) is at the right extreme position, the E2 hole on the right side is communicated with the middle inner cavity of the lock body (1).

2. The three-way hydraulic locking device according to claim 1, characterized in that: The outer circumference of the shuttle-shaped piston (2) and the inner surface of the through hole of the lock body (1) are matched in a sliding mechanical seal.

3. The three-way hydraulic locking device according to claim 1, characterized in that: The one-way valve (3) comprises a valve sleeve (3-1), a locking screw plug (3-2), a spring (3-3) and a valve body (3-4); wherein the valve sleeve (3-1) is threadedly sealed with a through hole of the lock body (1); an oil inlet (3-5) is provided at the inner end of the valve sleeve (3-1); the oil inlet (3-5) corresponds to the position of the trigger rod (21); the locking screw plug (3-2) is threadedly sealed at the outer end of the valve sleeve (3-1); a spring (3-3) is provided in the inner cavity of the valve sleeve (3-1); A valve body (3-4) is dynamically connected, the end of the valve body (3-4) is supported by one end of a spring (3-3), and the other end of the spring (3-3) is supported on the inner end surface of a locking screw plug (3-2); a conical surface is provided on the end surface of the valve body (3-4) close to the oil inlet (3-5), and the conical surface is in sealing contact with the oil inlet (3-5); a plurality of radial small holes are provided on the outer periphery of the valve body (3-4), and the inner cavity of the valve body (3-4) is communicated with the corresponding D hole or F hole through the radial small holes.

4. The three-way hydraulic locking device according to claim 1, characterized in that: When one set of oil inlet and outlet holes is used as the oil supply pipeline, the other two sets of oil inlet and outlet holes are used as the oil return pipeline.

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