Pilot relief valve group and hydraulic control system, mechanical equipment

Abstract

A kind of pilot shock absorber valve group and hydraulic control system, mechanical equipment.The pilot shock absorber valve group includes at least one shock absorbing unit;The shock absorbing unit is used to transport pilot oil to drive target object to execute first action, and shock absorption is carried out at the end stage when the target object executes first action.Using the above scheme, the vibration generated in the action process of mechanical structure such as swing arm, dipper arm can be reduced, to improve the stability and operation quality of operation.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control technology, specifically to a pilot damping valve assembly and hydraulic control system, and mechanical equipment. Background Technology

[0002] The boom and stick are crucial components of construction machinery, commonly found in excavators, loaders, and other similar equipment. Also known as the boom and arm of a hydraulic excavator, they are controlled by a hydraulic system to perform various movements, enabling corresponding operations such as boom raising, boom lowering, stick digging, and stick unloading. The design of the boom and stick gives construction machinery powerful digging and material handling capabilities.

[0003] However, in the current process of controlling the boom and stick movements using hydraulic systems, the boom and stick often vibrate, affecting operational stability and quality. Utility Model Content

[0004] The problem this invention aims to solve is: how to reduce the vibration generated by mechanical structures such as booms and sticks during operation, so as to improve operational stability and quality.

[0005] To address the aforementioned problems, this utility model provides a pilot damping valve assembly, comprising: at least one damping unit; the damping unit is used to deliver pilot oil to drive a target object to perform a first action, and to perform damping at the end stage of the target object performing the first action.

[0006] In one possible embodiment, the damping unit includes: a first damping component and a second damping component; wherein:

[0007] The first damping component is used to deliver pilot oil to drive the target object to perform a first action, and to perform damping at the end stage of the target object performing the first action;

[0008] The second damping component is used to deliver pilot oil to drive the target object to perform a second action, and to perform damping during the final stage of the target object performing the second action;

[0009] The second damping component is located on the oil return path of the first damping component, and the first damping component is located on the oil return path of the second damping component.

[0010] In one possible embodiment, the damping unit further includes: a first valve port, a second valve port, a third valve port, and a fourth valve port;

[0011] The first damping component is disposed between the first valve port and the third valve port; the second damping component is disposed between the second valve port and the fourth valve port;

[0012] The first shock absorber assembly has a first control terminal, which is connected to the second valve port;

[0013] The second shock absorber has a second control terminal, which is connected to the first valve port.

[0014] In one possible embodiment, the first damping assembly includes: a first damper, a first check valve, and a first directional valve connected in parallel, the first directional valve having the first control terminal.

[0015] In one possible embodiment, the first directional valve is a two-position two-way directional valve, which has a connected position and a closed position.

[0016] In one possible embodiment, the second damping assembly includes: a second damper, a second check valve, and a second directional valve connected in parallel; the second directional valve has the second control terminal.

[0017] In one possible embodiment, the second directional valve is a two-position two-way directional valve, which has a connected position and a closed position.

[0018] In one possible embodiment, there are two or more damping units, and each damping unit corresponds to a different target object.

[0019] In one possible embodiment, the pilot damping valve assembly includes: a first damping unit and a second damping unit, wherein the first damping unit corresponds to a first target object and the second damping unit corresponds to a second target object.

[0020] In one possible embodiment, the pilot damping valve assembly further includes: a housing; the at least one damping unit is located within the housing.

[0021] In one possible embodiment, two or more of the aforementioned damping units are arranged in the same direction within the housing.

[0022] This utility model embodiment also provides a hydraulic control system, the system including any of the above-described pilot damping valve assemblies.

[0023] This utility model embodiment also provides a mechanical device, which includes the above-described hydraulic control system.

[0024] Compared with the prior art, the technical solution of this utility model embodiment has the following advantages:

[0025] By applying the solution of this utility model, a shock-absorbing unit is set up. This shock-absorbing unit can deliver pilot oil to drive the target object to perform the first action, and can also perform shock absorption at the end stage of the target object performing the first action. This can reduce the vibration generated by mechanical structures such as boom and stick during operation, thereby improving the stability and quality of operation.

[0026] Furthermore, within the same damping unit, the first damping component can not only deliver oil to drive the target object to perform the first action, but also perform damping at the end stage of the target object performing the first action. The second damping component can not only deliver oil to drive the target object to perform the second action, but also perform damping at the end stage of the target object performing the second action. Therefore, there is no need to set up additional devices for each damping component to achieve damping. Damping can be achieved directly by using the damping component that does not deliver oil to the target main valve. This simplifies the structure of the damping unit, thereby reducing the installation space occupied by the damping unit and reducing the difficulty of space layout. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the hydraulic control system in a mechanical device;

[0028] Figure 2 This is a schematic diagram of the structure of a pilot damping valve assembly in an embodiment of this utility model;

[0029] Figure 3 This is a schematic diagram of another pilot damping valve assembly in an embodiment of this utility model;

[0030] Figure 4 This is a schematic diagram of the structure of another pilot damping valve assembly in this utility model embodiment;

[0031] Figure 5 This is a schematic diagram of the external structure of a pilot damping valve assembly according to an embodiment of this utility model. Detailed Implementation

[0032] Figure 1 This is a schematic diagram illustrating the principle of a hydraulic control system in existing mechanical equipment. (Refer to...) Figure 1 The hydraulic system may include: an oil tank 10, a pilot pump 11, a main pump 12, a main valve 13, and a cylinder 14. The main valve 13 is a three-position four-way directional valve.

[0033] Taking the boom lifting as an example, the pilot pump 11 pumps pilot oil from the oil tank 10 and flows into the left pilot chamber of the main valve 13 through the oil passage. The left pilot chamber of the main valve 13 pushes the left position of the main valve to move to the right to the middle position. At this time, the main pump 12 is connected to the cylinder 14 through the left position of the main valve 13 and pumps oil into the cylinder 14, pushing the cylinder 14 to move, thereby driving the boom to lift. During the boom lifting process, the oil flowing out of the cylinder 14 flows back to the oil tank 10 through the oil passage.

[0034] When the boom needs to stop rising, the pressure at the inlet of the pilot chamber oil passage on the left side of the main valve 13 will disappear instantly, and the pressure on the left and right sides of the main valve 13 will become unbalanced instantly, which will cause the hydraulic cylinder 14 to change its movement rapidly, thereby causing the boom to vibrate.

[0035] In practical applications, vibrations in the boom and stick can affect operational stability and quality.

[0036] To address this problem, this utility model provides a pilot damping valve assembly. The pilot damping valve assembly is equipped with a damping unit. This damping unit can not only deliver pilot oil to drive the target object to perform the first action, but also perform damping at the end stage of the target object performing the first action. This can reduce the vibration generated by mechanical structures such as boom and stick during operation, thereby improving operational stability and work quality.

[0037] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0038] Reference Figure 2 This utility model provides a pilot damping valve assembly, which may include at least one damping unit 21.

[0039] The damping unit 21 is used to deliver pilot oil to drive the target object to perform a first action, and to perform damping during the final stage of the target object performing the first action.

[0040] Specifically, the target object can be either a boom or a stick. When the target object is a boom, the first action can be either a boom raising action or a boom lowering action. When the target object is a stick, the target object can be either a stick digging action or a stick unloading action. Pilot hydraulic fluid is delivered to the target main valve corresponding to the target cylinder via the damping unit 21, thereby changing the path of the main hydraulic fluid in the target cylinder and thus driving the action of the target object. Furthermore, at the end stage of the first action performed by the target object, the damping unit 21 can slow down the flow rate of the pilot hydraulic fluid returning to the oil tank, thereby achieving vibration damping.

[0041] In one embodiment of this utility model, the damping unit 21 may include: a first damping component 211 and a second damping component 212; the first damping component 211 is used to deliver pilot oil to drive the target object to perform a first action, and to perform damping at the end stage of the target object performing the first action; the second damping component 212 is used to deliver pilot oil to drive the target object to perform a second action, and to perform damping at the end stage of the target object performing the second action.

[0042] The second damping component 212 is located on the oil return path of the first damping component 211, and the first damping component 211 is located on the oil return path of the second damping component 212.

[0043] The first damping component 211 performs damping at the end of the first action of the target object, and the second damping component 212 performs damping at the end of the second action of the target object. This eliminates the need for additional damping devices, thus simplifying the structure of the damping unit and reducing the installation space required by the damping unit, thereby reducing the difficulty of space layout.

[0044] In one embodiment of this utility model, reference is made to Figure 2 The damping unit 21 further includes: a first valve port A11, a second valve port B11, a third valve port A12, and a fourth valve port B12;

[0045] The first damping component 211 is disposed between the first valve port A11 and the third valve port A12; the second damping component 212 is disposed between the second valve port B11 and the fourth valve port B12;

[0046] The first shock absorber 211 has a first control terminal, which is connected to the second valve port B11;

[0047] The second shock absorber 212 has a second control terminal, which is connected to the first valve port A11.

[0048] Specifically, refer to Figure 2When the target object needs to perform the first action, oil can enter from the first valve port A11, pass through the first damping component 211, and then flow into the first pilot oil chamber of the target main valve M through the third valve port A12, thereby causing the target main valve M to switch. The main pump pumps oil into the target cylinder based on the switched target main valve, thereby driving the target object to perform the first action. For example, the target cylinder can be a boom cylinder. After the oil enters the boom cylinder, it will cause the piston rod in the boom cylinder to extend, thereby driving the boom to rise. During the process of driving the target object to perform the first action, the oil in the second pilot oil chamber of the target main valve M flows out and flows back to the oil tank through the fourth valve port B12, the second damping component 212, and the second valve port B11. At the end of the first action of the target object, no oil enters from the first valve port A11, and the oil in the first pilot oil chamber flows back to the oil tank at a slower rate after passing through the third valve port A12, thereby achieving shock absorption.

[0049] Similarly, when the target object needs to perform a second action, oil can enter through the second valve port B11, pass through the second damping component 212, and then flow into the second pilot oil chamber of the target main valve M through the fourth valve port B12, thereby causing the target main valve M to switch. The main pump pumps oil into the target cylinder based on the switched target main valve, thus driving the target object to perform the second action. For example, the target cylinder can be a boom cylinder; after the oil enters the boom cylinder, it causes the piston rod in the boom cylinder to retract, thereby driving the boom to descend. During the process of driving the target object to perform the second action, the oil in the second pilot oil chamber of the target main valve M flows out and returns to the oil tank through the third valve port A12, the first damping component 211, and the first valve port A11. At the end of the second action, no oil enters through the second valve port B11, and the oil in the second pilot oil chamber flows back to the oil tank at a slower rate after passing through the fourth valve port B12, thus achieving damping.

[0050] In specific implementations, the first damping component 211 and the second damping component 212 can be implemented in various ways, and no limitation is made here. The structures of the first damping component 211 and the second damping component 212 can be the same or different.

[0051] In one embodiment of this utility model, reference is made to Figure 3 The first damping component 211 may include: a first damper a1, a first check valve b1 and a first directional valve c1 connected in parallel, wherein the first directional valve c1 has the first control terminal.

[0052] In one embodiment of this utility model, reference is made to Figure 3 The second damping component 212 may include: a second damper a2, a second check valve b2 and a second directional valve c2 connected in parallel, wherein the second directional valve c2 has the second control terminal.

[0053] Specifically, in the first damping assembly 211, the first damper a1 can limit the flow of oil, thereby slowing down the oil flow rate and playing a role in damping vibration. The first check valve b1 is used to restrict the direction of oil flow, so that the oil in the oil passage can only flow from the first valve port A11 to the third valve port A12. The first directional valve c1 is a hydraulically controlled directional valve, which can be connected or disconnected according to the hydraulic control at the first control end.

[0054] In the second damping assembly 212, the second damper a2 can limit the flow of oil, thereby slowing down the oil flow rate and playing a role in damping vibration. The second check valve b2 is used to restrict the direction of oil flow, so that the oil in its oil passage can only flow from the second valve port B11 to the fourth valve port B12. The second directional valve c2 is a hydraulically controlled directional valve, which can be opened or closed by hydraulic control at the second control end.

[0055] In specific implementation, the first directional valve c1 is a two-position two-way directional valve, and the second directional valve c2 can also be a two-position two-way directional valve. The two-position two-way directional valve has an open position and a closed position. The structure and working principle of the first directional valve c1 and the second directional valve c2 are the same.

[0056] Specifically, taking the first directional valve c1 as an example, a spring is provided on the cut-off side of the first directional valve c1, and a hydraulic control module is provided on the open side of the first directional valve c1. Under normal conditions, the spring pushes the cut-off position of the first directional valve c1, keeping it in a cut-off state, preventing oil from flowing through it. When the hydraulic control module is subjected to oil pressure, and this pressure exceeds the force exerted by the spring on the cut-off position of the first directional valve c1, the hydraulic control module pushes the open position of the first directional valve c1, keeping it in an open state, allowing oil to flow through it. Similarly, the second directional valve c2 can be switched from a cut-off position to an open position under the oil pressure at the second control end.

[0057] In practice, the first and second actions performed by the target cylinder on the target object are usually opposite actions. For example, when the target object is a boom, the first action can be a boom raising action, and the second action can be a boom lowering action. When the target object is a stick, the first action can be a stick digging action, and the second action can be a stick unloading action.

[0058] Taking the boom cylinder as the target cylinder and the boom as the target object as an example, when the boom needs to be driven to rise, the hydraulic fluid can enter from the first valve port A11. At this time, in the first damping assembly 211, due to the flow restriction of the first damping a1, the first check valve b1 allows the hydraulic fluid to flow through, and there is no hydraulic fluid pressure at the first control end of the first directional valve c1. Therefore, the hydraulic fluid will flow into the first pilot oil chamber of the target main valve M through the oil passage where the first check valve b1 is located, thereby driving the boom to rise. During the process of driving the boom to rise, the hydraulic fluid in the second pilot oil chamber of the target main valve M flows back to the oil tank through the fourth valve port B12, the second damping assembly 212, and the second valve port B11 in sequence. Among them, in the second damping assembly 212, due to the flow restriction of the second damping a2, the second check valve b2 does not allow the hydraulic fluid to flow through, and there is hydraulic fluid pressure at the second control end of the second directional valve c2. Therefore, the hydraulic fluid will flow back to the oil tank through the oil passage where the second directional valve c2 is located.

[0059] At the end of the boom lifting phase, no oil enters the first valve port A11. The oil in the first pilot oil chamber flows back to the oil tank through the third valve port A12 and the channel where the first damper a1 is located, thereby achieving shock absorption.

[0060] In some embodiments, the damping unit may further include at least one pressure testing interface, which may be connected to the pipeline of at least one of the first control terminal and the second control terminal, for detecting the oil pressure received by the first control terminal or the second control terminal, so as to facilitate troubleshooting and reduce maintenance costs.

[0061] Specifically, refer to Figure 3 The damping unit 10 may include a first pressure measuring interface MA11 and a second pressure measuring interface MB11. The first pressure measuring interface MA11 is connected to the first valve port A11, which is also connected to the pipeline where the second control terminal is located. The second pressure measuring interface MB11 is connected to the second valve port B11, which is also connected to the pipeline where the first control terminal is located.

[0062] The first pressure testing interface MA11 can be used to detect the oil pressure at the second control terminal, which facilitates troubleshooting of the second directional valve c2 in the second damping assembly 212. The second pressure testing interface MB11 can be used to detect the oil pressure at the first control terminal, which facilitates troubleshooting of the first directional valve c1 in the first damping assembly 211.

[0063] In practice, the pilot damping valve assembly may be equipped with only one damping unit, thereby enabling damping to be performed only at the end of the action of a target object.

[0064] In one embodiment of this invention, the pilot damping valve assembly may be provided with two or more damping units, each damping unit corresponding to a different target hydraulic cylinder. By providing multiple damping units, each damping unit dampens the drive action of its corresponding target hydraulic cylinder, thereby meeting the damping requirements of various actions and improving the integration of the pilot damping valve assembly.

[0065] For example, refer to Figure 4 The pilot damping valve assembly may include two damping units, namely a first damping unit 31 and a second damping unit 32. The first damping unit 31 corresponds to the first target cylinder, and the second damping unit 32 corresponds to the second target cylinder.

[0066] Specifically, the first damping unit 31 can perform damping during the process of the first target cylinder driving the first target object to perform an action. The second damping unit 32 can perform damping during the process of the second target cylinder driving the second target object to perform an action. The actions performed by the first target cylinder driving the first target object can include various types.

[0067] Taking the application of pilot-operated damping valve assembly on an excavator as an example, the first target cylinder can be the boom cylinder, and the second target cylinder can be the stick cylinder. The boom cylinder can drive the boom to perform boom raising and lowering actions. The stick cylinder can drive the boom to perform stick digging and stick unloading actions. This simultaneously meets the damping requirements of the boom raising, boom lowering, stick digging, and stick unloading processes, thereby reducing vibration during boom and stick movements.

[0068] Specifically, the first damping unit 31 may include a first damping component 311 and a second damping component 312. The second damping unit 32 may include a first damping component 321 and a second damping component 322.

[0069] The following describes the working process of the first damping unit 31 and the second damping unit 32, taking the boom raising process and the stick digging process as examples:

[0070] When the boom needs to be raised, oil enters from the first valve port A11 and flows into the first target main valve M1 through the oil passage containing the first check valve in the first damping assembly 311. Oil flowing out of the first target main valve M11 flows back to the oil tank through the fourth valve port B12 and the second directional valve in the second damping assembly 312. At the end of the boom raising phase, no oil enters the first valve port A11, allowing oil flowing out of the pilot oil chamber of the first target main valve M11 to flow back to the oil tank through the third valve port A12 and the first damper in the first damping assembly 311.

[0071] When the stick needs to be driven for digging, oil enters from the first valve port A21 and flows into the second target main valve M2 through the oil passage containing the first check valve in the first damping assembly 321. Oil flowing out of the second target cylinder 42 flows back to the oil tank through the fourth valve port B22 and the second directional valve in the second damping assembly 322. At the end of the stick digging phase, no oil enters the first valve port A21, allowing oil flowing out of the pilot oil chamber of the second target main valve M2 to flow back to the oil tank through the third valve port A22 and the first damper in the first damping assembly 321.

[0072] In one embodiment of this utility model, reference is made to Figure 5 The pilot damping valve assembly may further include a housing 401. The at least one damping unit is located within the housing 401. The housing 401 may be made of metal and have a regular shape (e.g., cuboid, cube, etc.). Each valve port of the damping unit may be located on the surface of the housing 401 and matched with an external oil piping structure. Other components of the damping unit are located within the housing 401 and communicate with each valve port via oil passages.

[0073] In practical implementation, when the pilot damping valve assembly includes two or more damping units, each damping unit can be arranged in the same direction within the housing 401. For example, refer to... Figure 4 The two damping units can also be arranged along the length of the rectangular shell 401, which can further reduce the installation space occupied by the pilot damping valve group and reduce the difficulty of spatial arrangement.

[0074] As can be seen from the above, in this embodiment of the present invention, the pilot damping valve assembly can prevent the third valve port A12 (e.g., when the target object needs to stop moving) from moving. Figure 2 As shown), fourth valve port B12 (as shown) Figure 2 The sudden disappearance of oil (as shown) causes a sudden drop in pressure, thereby achieving vibration damping. Furthermore, the pilot damping valve assembly in this embodiment of the invention features high integration, meeting the vibration damping requirements of four main actions: boom raising and lowering, and stick digging and unloading. By setting a pressure testing interface, the cause of failure in the pilot damping valve assembly is easily diagnosed, resulting in low maintenance costs. This pilot damping valve assembly also significantly reduces installation space and spatial layout complexity. In addition, the pilot damping valve assembly is a specialized valve and can be applied in multiple fields.

[0075] This utility model embodiment also provides a hydraulic control system, which may include the above-mentioned pilot damping valve group.

[0076] Specifically, the pilot control system may further include a pilot handle, a pilot pump, a target main valve, and a target cylinder. After the user inputs an action control command via the pilot handle, the pilot pump pumps oil from the tank, which then flows through the pilot damping valve assembly into the pilot oil chamber of the target main valve, thereby allowing the user to control the reversing of the target main valve. The main pump then pumps main fluid into the target cylinder via the reversing target main valve, achieving action drive. The oil in the target cylinder flows directly back to the tank.

[0077] At the end of the action, the oil in the pilot oil chamber of the target main valve flows back to the oil tank through the oil passage where the damper is located in the pilot damping valve group, thereby achieving vibration reduction.

[0078] This utility model embodiment also provides a mechanical device, which includes the hydraulic control system described in the above embodiment.

[0079] In practice, the mechanical equipment includes, but is not limited to, mobile construction machinery such as excavators.

[0080] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A pilot-operated damping valve assembly, characterized in that, include: At least one damping unit; the damping unit is used to deliver pilot oil to drive the target object to perform a first action, and to perform damping at the end stage of the target object performing the first action.

2. The pilot damping valve assembly as described in claim 1, characterized in that, The damping unit includes: a first damping component and a second damping component; wherein: The first damping component is used to deliver pilot oil to drive the target object to perform a first action, and to perform damping at the end stage of the target object performing the first action; The second damping component is used to deliver pilot oil to drive the target object to perform a second action, and to perform damping during the final stage of the target object performing the second action; The second damping component is located on the oil return path of the first damping component, and the first damping component is located on the oil return path of the second damping component.

3. The pilot damping valve assembly as described in claim 2, characterized in that, The shock absorption unit further includes: a first valve port, a second valve port, a third valve port, and a fourth valve port; The first damping component is disposed between the first valve port and the third valve port; the second damping component is disposed between the second valve port and the fourth valve port; The first shock absorber assembly has a first control terminal, which is connected to the second valve port; The second shock absorber has a second control terminal, which is connected to the first valve port.

4. The pilot damping valve assembly as described in claim 3, characterized in that, The first damping component includes: a first damper, a first check valve, and a first directional valve connected in parallel, wherein the first directional valve has the first control terminal.

5. The pilot damping valve assembly as described in claim 4, characterized in that, The first directional valve is a two-position two-way directional valve, which has a connected position and a closed position.

6. The pilot damping valve assembly as described in claim 3, characterized in that, The second damping assembly includes: a second damper, a second check valve, and a second directional valve connected in parallel; the second directional valve has the second control terminal.

7. The pilot damping valve assembly as described in claim 6, characterized in that, The second directional valve is a two-position two-way directional valve, which has a connected position and a closed position.

8. The pilot damping valve assembly as described in any one of claims 1 to 7, characterized in that, There are two or more damping units, and each damping unit corresponds to a different target object.

9. The pilot damping valve assembly as described in claim 8, characterized in that, The pilot damping valve assembly includes a first damping unit and a second damping unit, wherein the first damping unit corresponds to a first target object and the second damping unit corresponds to a second target object.

10. The pilot damping valve assembly as described in claim 1, characterized in that, The pilot damping valve assembly further includes: a housing; the at least one damping unit is located inside the housing.

11. The pilot damping valve assembly as described in claim 10, characterized in that, Two or more of the aforementioned damping units are arranged in the same direction within the housing.

12. A hydraulic control system, characterized in that, Includes the pilot damping valve assembly as described in any one of claims 1 to 11.

13. A mechanical device, characterized in that, include: The hydraulic control system according to claim 12.

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