A hydraulic drive device and hydraulic system that can be manually unlocked

Abstract

The utility model relates to a kind of hydraulic drive device and hydraulic system that can be manually unlocked, the device includes: valve body and the shell connected with the valve body;Wherein, balance valve hole and several oil paths for oil flowing between each component are provided on the valve body, the balance valve hole inside is provided with the balance valve combination for maintaining the normal operation of walking device;Brake assembly for braking locking walking device is arranged in the shell inside.The utility model divides control oil into three strands, respectively acts on hydraulic control valve core combination, brake and oil drain, and can reliably remove hydraulic brake and mechanical brake.

Description

Technical Field

[0001] This utility model belongs to the field of engineering machinery technology, specifically relating to hydraulic drive device technology, and particularly to a hydraulic drive device and hydraulic system that can be manually unlocked. Background Technology

[0002] During the operation of construction machinery, it is not uncommon for sudden failures to cause the equipment to be unable to drive the walking device to move. The resulting work stoppage not only causes direct economic losses, but may also trigger a chain reaction, delaying the construction period and putting the project in a passive position.

[0003] In the prior art, when the equipment fails to drive the walking device to move during operation due to a malfunction, the multiple resistances inside the hydraulic motor responsible for walking, including mechanical braking, hydraulic braking, and the torque amplification mechanism of the reduction gearbox, make towing operations extremely difficult. Utility Model Content

[0004] In view of this, the present invention proposes a hydraulic drive device and hydraulic system that can be manually unlocked, aiming to solve the problems existing in the prior art.

[0005] Specifically, the present invention provides a manually unlockable hydraulic drive device, comprising: Valve body and housing connected to the valve body; The valve body is provided with a balance valve hole and several oil passages for oil to flow between various components. The balance valve hole is provided with a balance valve assembly for maintaining the normal operation of the walking device. A braking assembly for braking and locking the walking device is provided inside the housing.

[0006] Based on the above solution, it also includes: a balance valve spring provided on the balance valve assembly for providing a reset force to the balance valve assembly; A throttling nozzle assembly for controlling oil flow is installed inside the oil circuit; A check valve is provided inside the oil circuit to allow control oil to flow into the braking assembly in one direction to release the mechanical brake; A hydraulically controlled valve core assembly that is axially slidably disposed inside the valve body; And a hydraulic control valve core spring disposed inside the valve body to provide a reset force for the hydraulic control valve core assembly.

[0007] Based on the above scheme, the braking assembly includes: A brake is installed inside the housing to control whether the hydraulic motor is braked; A brake spring is provided inside the brake to provide mechanical braking force; A brake steel sheet is provided inside the housing for use with brake pads to generate friction. And brake pads that are disposed inside the housing and used in conjunction with brake steel pads.

[0008] Based on the above solution, the throttle nozzle assembly includes: A first throttling nozzle is provided inside the balance valve orifice to control the flow rate of oil entering the balance valve assembly. The third oil flow nozzle is used to control the flow rate of oil to the drain port T; And a fourth throttle nozzle used to control the flow of oil from the check valve to the brake.

[0009] Based on the above scheme, it also includes: a quick-release screw plug installed on the D port on the valve body.

[0010] Based on the above scheme, a first O-ring rubber seal is provided between the quick-release plug and the valve body.

[0011] Based on the above solution, it also includes: a first iron plug provided at one end of the hydraulic valve core assembly; A second O-ring rubber seal is provided at the position where the first iron screw plug contacts the valve body; A sealing plug for sealing the hydraulic control valve core assembly is provided on one side of the first iron screw plug.

[0012] Based on the above scheme, a one-way valve spring for providing reset force is provided on the one-way valve, and a second iron screw plug for sealing the oil port is provided at the end of the one-way valve. A third O-ring rubber seal is provided at the position where the second iron plug contacts the oil port.

[0013] Based on the above scheme, it also includes: a reversing valve seat plug for sealing the balance valve assembly provided on the valve body, and a fourth O-ring rubber seal provided at the position where the reversing valve seat plug contacts the valve body.

[0014] In addition, this utility model also provides a hydraulic system, including the aforementioned manually unlockable hydraulic drive device.

[0015] Compared to existing solutions, this invention divides the control oil into three streams, which act on the hydraulic valve core assembly, the brake, and the drain oil respectively, reliably releasing both hydraulic and mechanical brakes. Furthermore, addressing the potential issue of increased pressure in the valve chamber at the front end of the hydraulic valve core assembly causing motor malfunction, this invention connects a single oil path from the valve chamber to the housing cavity, allowing the oil to flow back to the tank via the drain port T, thus relieving pressure and ensuring the stability and reliability of the motor during normal operation. This invention requires only an Allen wrench to remove the quick-release plug and replace it with a quick-connect coupling, then connecting a handheld hydraulic pump to complete the unlocking operation, eliminating the need for complex equipment and significant manpower. Even when the equipment malfunctions in a confined space, a few people can easily move the vehicle to a convenient maintenance location, reducing operational difficulty and labor costs. Attached Figure Description

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This utility model is a manually unlockable hydraulic drive device (showing a gearbox and a hydraulic motor). Figure 2 This is a schematic diagram illustrating the working principle of the manually unlockable hydraulic drive device of this utility model. Figure 3 Here is a schematic diagram of the one-way valve assembly of this utility model: Figure 4 This is a schematic diagram of the structure of the hydraulic control valve core assembly of this utility model; Figure 5 This is a structural schematic diagram of the balance valve assembly of this utility model (showing oil port A and oil port B). Figure 6 This is a schematic diagram of the structure of the D-port and hydraulic control valve core assembly of this utility model. Detailed Implementation

[0017] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, embodiments and features of the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] like Figures 1-2 As shown, this application provides a specific embodiment of a manually unlockable hydraulic drive device, which includes: Valve body 22, on which a balance valve hole and several oil passages are provided; A housing 27 connected to the valve body 22, and a braking assembly for braking the hydraulic motor disposed inside the housing 27; A cylinder 28 disposed inside the housing 27 and connected to the valve body 22; A plunger 29 is installed inside the cylinder block 28. Specifically, pressurized oil enters the cylinder block 28 through the inlet of the distribution plate 25, pushing the plunger 29 out and pressing against the swashplate 31. The plunger 29 rotates the cylinder block 28 due to its reaction force. The rotation of the main shaft 32, which is connected to the cylinder block 28 via a spline, drives the reduction gearbox to rotate. Oil from the opposite plunger 29 flows back to the oil tank through the distribution plate 25. When the external valve switches, the oil inlet and outlet of the motor are reversed, and the motor rotates in the opposite direction.

[0019] The aforementioned hydraulic drive device includes a hydraulic motor and a gearbox. The hydraulic motor and gearbox are conventional structures in the prior art and are not the innovative points of this utility model, so they will not be described in detail here.

[0020] The balance valve orifice is provided with a matching balance valve assembly 1; A balance valve spring 2 is provided on the balance valve assembly 1 to provide a reset force for the balance valve assembly 1; A throttling nozzle assembly for controlling oil flow is installed inside the oil circuit; A one-way valve 5 is provided inside the oil circuit to allow control oil to flow into the brake 8 cavity in one direction to release the mechanical brake; A hydraulic control valve core assembly 6 is provided inside the valve body 22 and can slide axially within the valve body 22; A hydraulic valve core spring 7 is provided inside the valve body 22 to provide a reset force for the hydraulic valve core assembly 6.

[0021] In the above scheme, the balance valve assembly 1 and the valve body 22 are connected by clearance fit, and the balance valve hole, balance valve assembly 1 and left and right parts in the valve body 22 are all symmetrical.

[0022] As one specific implementation, the braking assembly includes: A brake 8 is provided inside the housing 27 for controlling whether the hydraulic motor is braked; A brake spring 19 is provided inside the brake 8 to provide mechanical braking force; Brake steel sheet 20, which serves as an active friction pad for a brake, is disposed inside the housing 27; and a brake pad 21 that is disposed inside the housing 27 and used in conjunction with the brake pad 20.

[0023] Specifically, the brake pad 21 serves as the driven friction pad of the brake 8, and is paired with the brake steel pad 20. The friction force generated by clamping is used to achieve mechanical braking. The brake steel pad 20 is connected to the housing 27 through an arc groove, and the brake pad 21 is connected to the cylinder 28 through a keyway.

[0024] The cavity of brake 8 is connected to a check valve and a throttle nozzle through an oil circuit, and receives control oil to release the brake. Brake 8 provides mechanical braking function for hydraulic motor. Under normal conditions, braking is achieved by the brake spring 19 pushing the brake steel plate 20 and brake rubber plate 21 to clamp together. When control oil enters its cavity and overcomes the force of the brake spring, the mechanical braking is released.

[0025] like Figure 3 As shown, a one-way valve spring 16 is provided on the one-way valve 5 to provide a reset force, and a second iron plug 17 is provided at the end of the one-way valve 5 to close the oil port. To further improve the sealing performance, a third O-ring rubber seal 18 is provided at the position where the second iron plug 17 contacts the oil port. The one-way valve 5 and the valve body 22 are sealed by a conical surface, and the one-way valve spring 16 provides the closing force of the one-way valve 5, ensuring that the control oil can only flow from the D port towards the brake 8 and cannot flow in the opposite direction.

[0026] As a specific implementation, the throttle nozzle assembly includes a first throttle nozzle 3 disposed inside the balance valve orifice for controlling the flow rate of oil entering the balance valve assembly 1, a third throttle nozzle 9 for controlling the flow rate of oil to the drain port T, and a fourth throttle nozzle 10 for controlling the flow rate of oil from the check valve 5 to the brake 8.

[0027] The function of the third throttle nozzle 9 is to control the oil to be divided into three streams when the hand-held hydraulic pump supplies oil to port D. One stream flows through the return oil T. By increasing the third throttle nozzle 9, the flow rate is limited, which plays a role in maintaining pressure because the cavity volume of the brake 8 is limited and cannot maintain pressure for a long time.

[0028] The aforementioned oil circuit is used to guide and distribute hydraulic oil from different locations such as port A, port B, unlocking control port D, and drain port T according to control requirements. In this device, the oil circuit is used to distribute the control oil from port D to the hydraulic control valve core assembly 6, check valve 5, brake 8, first throttle nozzle 3, third throttle nozzle 9, and fourth throttle nozzle 10, ultimately leading to drain port T or the return oil tank.

[0029] like Figures 4-5As shown, the hydraulic control valve core assembly 6 is a key actuator in the oil circuit. When the control oil pressure entering through port D is sufficient (>1.5MPa), it pushes the hydraulic control valve core assembly 6 to overcome the elastic force of the hydraulic control valve core spring 7, changing the internal oil circuit state so that oil chamber C1 and oil chamber C2 are connected, that is, oil port A and oil port B are connected, thereby releasing the hydraulic brake.

[0030] The hydraulic valve core assembly 6 is connected to the valve body 22 with a clearance fit. One end of the hydraulic valve core assembly 6 is provided with a screw plug with an O-ring, and the other end of the hydraulic valve core assembly 6 is connected to the hydraulic valve core spring 7. A gasket 24 is also provided at the contact point between the balance valve spring 2 and the valve body 22. When the motor stops working, the balance valve assembly 1 needs to accurately return to the neutral position. If the spring forces of the two balance valve springs 2 are inconsistent due to manufacturing errors, the gasket 24 provides an absolute stop point for the valve core through its precision-machined rigid limiting surface, effectively eliminating the positional deviation caused by the difference in spring forces. This ensures that the balance valve assembly 1 can always accurately reset to the predetermined neutral position, avoiding hydraulic system pressure imbalance caused by inaccurate reset. This design achieves dynamic compensation for manufacturing errors, significantly improving the stability and service life of the system.

[0031] A first iron plug 15 is provided at one end of the hydraulic valve core assembly 6. A sealing plug 13 for sealing the hydraulic valve core assembly 6 is provided on one side of the first iron plug 15. To further improve the sealing performance, a second O-ring rubber seal 14 is provided at the position where the first iron plug 15 contacts the valve body 22.

[0032] like Figure 5 As shown, it also includes a reversing valve seat plug 25 provided on the valve body 22 for sealing the balance valve assembly 1. To further improve the sealing performance, a fourth O-ring rubber seal 26 is provided at the contact position between the reversing valve seat plug 25 and the valve body 22. The reversing valve seat plug 25 is provided with an annular groove for installing the fourth O-ring rubber seal 26, and is fastened to the valve body 22 by a threaded connection to seal through the fourth O-ring rubber seal 26.

[0033] like Figure 6 As shown, in a specific implementation, a quick-release plug 11 is installed at the D unlocking control port on the valve body 22; for further sealing, a first O-ring rubber seal 12 is also provided between the quick-release plug 11 and the valve body 22.

[0034] Based on the above solution, the working principle of a manually unlockable hydraulic drive device is provided: This hydraulic drive unit adopts a three-way control oil diversion design and achieves reliable manual unlocking function through a dual release mechanism of hydraulic and mechanical braking.

[0035] After the hydraulic oil enters the system through port D, it is divided into three independent oil circuits, specifically: A stream of control oil acts on the hydraulic control valve core assembly 6, overcoming the force of the hydraulic control valve core spring 7 and moving the hydraulic control valve core assembly 6 (the pressure pushing the hydraulic control valve core assembly 6 needs to be greater than 1.5MPa), changing its working position, realizing the connection between chamber C1 and chamber C2 (connection between oil port A and oil port B), and releasing the hydraulic brake; Two streams of control oil act on the one-way valve 5, overcoming the force of the one-way valve spring 16 to open the one-way valve 5. After passing through the fourth throttle nozzle 10, they finally act on the cavity of the brake 8, overcoming the force of the brake spring 19 (the pressure of the brake spring 19 needs to be greater than 1.5MPa to release the brake spring 19), moving the brake 8 to fit against the valve body 22, causing the brake steel sheet 20 and the brake pad 21 to separate, thus releasing the mechanical brake. The three streams of oil flow through the third throttle nozzle 9 to the cavity of housing 27, then through the drain port T back to the oil tank. (The purpose of adding the third oil path is to solve the problem of adding this unlocking function to the motor. When the motor is working normally, the D oil port is sealed and tightened using the quick-release plug 11 and the first O-ring rubber seal 12. When the motor is working, when high-pressure oil enters either the A or B oil port, it passes through the first throttle nozzle 3, pushing the balance valve assembly 1 to overcome the force of the balance valve spring 2, moving the balance valve assembly 1 to the other side, and limiting it through the reversing valve plug 25, changing its working position, so that the high-pressure oil passes through the middle process hole of the valve body, then through the fourth throttle nozzle 10, to reach the inner cavity of the brake 8, pushing...) Brake 8 overcomes the spring force of brake spring 19 and fits against the large plane of valve body 22, causing brake steel sheet 20 to separate from brake rubber sheet 21, releasing the mechanical brake and reaching check valve 5. Since check valve 5 does not have an absolute seal, there is still a slight leakage. Over time, the accumulated oil will fill the front valve chamber of hydraulic control valve core assembly 6, causing the pressure to rise and push hydraulic control valve core assembly 6 to move, connecting chambers C1 and C2 [connecting oil port A and oil port B], causing the hydraulic motor to malfunction. The solution is to lead an oil path from the front valve chamber of hydraulic control valve core assembly 6 to connect with the inner cavity of housing 27, so that the oil flows to drain port T and returns to the oil tank to achieve pressure relief, thus preventing the hydraulic control valve core assembly 6 from being pushed and ensuring the normal operation of the motor.

[0036] like Figure 2As shown, the control oil D is initially split into two paths: one returns directly to the drain port T; the other is guided to the second branch point, where the oil is split into two branches again: one acts on the hydraulic control valve core assembly 6, and the other is sent to the check valve 5, and then flows through the third branch point. At this branch point, the oil is split into two paths again: one is applied to the brake 8, and the other flows through the balance valve assembly 1, flowing from the gap to the two oil ports A and B respectively.

[0037] When the equipment is in use and the walking device cannot be driven due to a malfunction, the quick-release plug 11 can be removed with an Allen wrench and replaced with a quick connector. The handheld hydraulic pump and port D can then be connected to supply oil, releasing the hydraulic and mechanical brakes. This allows for easy movement of the equipment to other locations for troubleshooting and repair without affecting further on-site operations.

[0038] This invention allows for the removal of quick-release plugs using an Allen wrench, replacement with quick-connect couplings, and connection of a handheld hydraulic pump to port D for oil supply, thereby releasing both hydraulic and mechanical brakes. This facilitates manual and equipment towing, enabling the equipment to be moved to other locations for troubleshooting and repair, avoiding direct economic losses due to equipment downtime, preventing project delays and project stagnation, and effectively solving the problem of difficult towing when equipment malfunctions.

[0039] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A manually unlockable hydraulic drive device, characterized in that, include: Valve body (22) and housing (27) connected to the valve body (22); The valve body (22) is provided with a balance valve hole and several oil passages for oil to flow between various components. The balance valve hole is provided with a balance valve assembly (1) for maintaining the normal operation of the walking device. A braking assembly for braking and locking the walking device is provided inside the housing (27); A cylinder (28) disposed inside the housing (27) and connected to the valve body (22); A plunger (29) is provided inside the cylinder (28).

2. The manually unlockable hydraulic drive device according to claim 1, characterized in that, Also includes: A balance valve spring (2) is provided on the balance valve assembly (1) to provide a return force to the balance valve assembly (1); A throttling nozzle assembly for controlling oil flow is installed inside the oil circuit; A one-way valve (5) is provided inside the oil circuit to allow control oil to flow into the braking assembly in one direction to release the mechanical brake. A hydraulic control valve core assembly (6) is axially slidably disposed inside the valve body (22); A hydraulic valve core spring (7) provided inside the valve body (22) for providing a reset force for the hydraulic valve core assembly (6).

3. The manually unlockable hydraulic drive device according to claim 1 or 2, characterized in that, The braking assembly includes: A brake (8) for controlling the braking of the hydraulic motor is provided inside the housing (27); A brake spring (19) is provided inside the brake (8) to provide mechanical braking force; A brake steel sheet (20) is provided inside the housing (27) for use with the brake pad (21) to generate friction. And a brake pad (21) provided inside the housing (27) for use with the brake pad (20).

4. The manually unlockable hydraulic drive device according to claim 2, characterized in that, The throttle nozzle assembly includes: A first throttling nozzle (3) is provided inside the balance valve orifice to control the flow rate of oil entering the balance valve assembly (1). The third throttle nozzle (9) is used to control the flow rate of oil to the drain port T. And a fourth throttle nozzle (10) for controlling the flow of oil from the check valve (5) to the brake (8).

5. The manually unlockable hydraulic drive device according to claim 1, characterized in that, Also includes: A quick-release screw plug (11) is provided on the D port of the valve body (22).

6. The manually unlockable hydraulic drive device according to claim 5, characterized in that, A first O-ring rubber seal (12) is provided between the quick-release plug (11) and the valve body (22).

7. The manually unlockable hydraulic drive device according to claim 2, characterized in that, Also includes: A first iron plug (15) is provided at one end of the hydraulic valve core assembly (6); A second O-ring rubber seal (14) is provided at the position where the first iron screw plug (15) contacts the valve body (22); A sealing plug (13) for sealing the hydraulic control valve core assembly (6) is provided on one side of the first iron screw plug (15).

8. The manually unlockable hydraulic drive device according to claim 2, characterized in that, A one-way valve spring (16) for providing a reset force is provided on the one-way valve (5), and a second iron plug (17) for closing the oil port is provided at the end of the one-way valve (5). A third O-ring rubber seal (18) is provided at the position where the second iron plug (17) contacts the oil port.

9. The manually unlockable hydraulic drive device according to claim 2, characterized in that, Also includes: A reversing valve seat plug (25) for sealing the balance valve assembly (1) is provided on the valve body (22), and a fourth O-ring rubber seal (26) is provided at the position where the reversing valve seat plug (25) contacts the valve body (22).

10. A hydraulic system, characterized in that, Includes the manually unlockable hydraulic drive device as described in any one of claims 1-9.

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