Valve group and slewing platform

Abstract

A valve group and a slewing platform, wherein the valve group comprises: a first reversing valve connected between a first pipeline and a second pipeline; a second reversing valve connected in series with the first reversing valve, and the normal position function of one of the first reversing valve and the second reversing valve is normally open, and the normal position function of the other reversing valve is normally closed; a control unit connected with control oil ports of the first reversing valve and the second reversing valve to control the reversing of the first reversing valve and the second reversing valve; and the control unit comprises a damping assembly suitable for delaying the reset of one of the first reversing valve and the second reversing valve. The damping assembly makes the first reversing valve and the second reversing valve both in the open state in the reset delay stage, so as to connect the first pipeline and the second pipeline in the delay stage, reduce the pressure difference between the first pipeline and the second pipeline, and further improve the problem of reciprocating swing of the slewing platform and improve the softness of slewing action.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control, and in particular to a valve assembly and a rotary platform. Background Technology

[0002] Currently, excavators are being used more and more widely, and are being used extensively in engineering construction, mining, agriculture, emergency rescue, and municipal engineering.

[0003] Because the slewing drive of an excavator is actuated by a slewing motor, and the slewing platform has a large mass, it requires high-pressure oil and high output torque to drive it. The larger the mass of the slewing platform, the greater its inertia, which requires addressing the issues of sudden stopping causing back-and-forth swaying that can damage the slewing motor and making operation less smooth. Utility Model Content

[0004] The problem solved by this invention is how to improve the rotary platform so that it does not swing back and forth repeatedly, reduces mechanical wear, and improves the smoothness of operation.

[0005] To address the aforementioned problems, this utility model provides a valve assembly, comprising: a first directional valve connected between a first pipeline and a second pipeline; a second directional valve connected in series with the first directional valve, wherein the normal position function of one of the second and first directional valves is normally open, and the normal position function of the other directional valve is normally closed; a control unit connected to the control ports of the first and second directional valves to control the switching of the first and second directional valves; the control unit includes: a damping component adapted to delay the reset of one of the first and second directional valves.

[0006] Optionally, the damping component is adapted to delay the reset of the normally closed directional valve in the first and second directional valves.

[0007] Optionally, the damping component is connected to the control port of the directional valve in the first and second directional valves, where the normal position function is normally closed.

[0008] Optionally, the damping assembly includes: a one-way valve; and a damper connected in parallel with the one-way valve.

[0009] Optionally, the damping component is connected to the control port of the directional valve in the first and second directional valves, where the normal position function is normally closed, and the conduction direction of the check valve is towards the control port of the directional valve.

[0010] Optionally, the control unit includes a shuttle valve having a first input port, a second input port, and an output port, wherein the first input port is connected to the first pipeline, and the second input port is connected to the second pipeline.

[0011] Optionally, it also includes: a replenishing valve, which is connected between the first pipeline, the second pipeline and the return oil T-port, and the return oil T-port is connected to the oil tank.

[0012] Optionally, the oil replenishing valve includes: a first oil replenishing valve, which is connected between the first pipeline and the return oil T-port; and a second oil replenishing valve, which is connected between the second pipeline and the return oil T-port.

[0013] Optionally, it also includes: a safety relief valve, which is connected between the first pipeline, the second pipeline and the return oil T-port, and the return oil T-port is connected to the oil tank.

[0014] Optionally, the safety relief valve includes: a first safety relief valve connected between the first pipeline and the return oil T-port; and a second safety relief valve connected between the second pipeline and the return oil T-port.

[0015] Accordingly, the present invention provides a rotary platform, comprising: a first pipeline, the first pipeline being connected to a first motor oil port of a rotary motor and a first main valve oil port of a main valve; a second pipeline, the second pipeline being connected to a second motor oil port of a rotary motor and a second main valve oil port of a main valve; and a valve assembly, the valve assembly being as described in any of the above embodiments.

[0016] Compared with the prior art, the technical solution of this utility model has the following advantages:

[0017] In the valve assembly of this utility model, the damping component is suitable for delaying the reset of one of the first and second directional control valves. The valve assembly is connected between the rotary motor and the main valve of the rotary platform. The first pipeline connects the first motor port of the rotary motor and the first main valve port of the main valve; the second pipeline connects the second motor port of the rotary motor and the second main valve port of the main valve. The damping component controls the switching of the first and second directional control valves according to the relative pressure of the first and second pipelines, delaying the reset of one of the first and second directional control valves compared to the other. This ensures that both the first and second directional control valves are open during the delay phase, connecting the first and second pipelines during the delay phase, reducing the pressure difference between the first and second pipelines, thereby improving the reciprocating oscillation problem of the rotary platform, reducing mechanical wear of the rotary motor, and improving operational smoothness.

[0018] In an optional embodiment of this invention, the damping component is suitable for delaying the reset of the normally closed directional valve in the first and second directional valves. Delaying the reset of the normally closed directional valve causes the rotary platform to stop turning. After the first reverse swing, the first and second pipelines are promptly connected to improve the reciprocating oscillation problem. Simultaneously, it avoids the connection of the first and second pipelines when the rotary platform begins to turn, preventing oil leakage from affecting the response speed when the rotary platform begins to turn.

[0019] In an optional embodiment of this utility model, an oil replenishing valve is further included, which is connected between the first pipeline, the second pipeline, and the return oil T-port, the return oil T-port being connected to the oil tank. The valve assembly integrates the oil replenishing valve, which is suitable for replenishing oil to the rotary motor, preventing cavitation caused by negative pressure forming a cavity in the rotary motor, and thus improving the service life of the rotary motor components.

[0020] In an optional embodiment of this utility model, a safety relief valve is further included, which is connected between the first pipeline, the second pipeline, and the return oil T-port, the return oil T-port being connected to the oil tank. The valve assembly integrates the safety relief valve, which is suitable for protecting the hydraulic components in the system from damage by excessive pressure, thereby improving the stability of the system. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the valve assembly according to some embodiments of this utility model;

[0022] Figure 2 This is a schematic diagram of a valve assembly according to other embodiments of this utility model. Detailed Implementation

[0023] As can be seen from the background technology, the current slewing platform still has shortcomings. The reasons for these shortcomings will now be analyzed.

[0024] The slewing platform is an important component of the excavator, enabling it to operate at multiple angles. The slewing motor is suitable for driving the slewing platform to rotate, and the main valve is suitable for supplying hydraulic oil to the slewing motor to drive the slewing platform to rotate.

[0025] The rotary platform includes: a first pipeline connecting the first motor port of the rotary motor and the first main valve port of the main valve; and a second pipeline connecting the second motor port of the rotary motor and the second main valve port of the main valve. The first and second pipelines connect the main valve port and the motor port, enabling the transport of hydraulic oil between the main valve and the rotary motor, and facilitating the bidirectional rotation of the rotary motor.

[0026] When the main valve supplies oil to the rotary motor and the excavator's rotary platform rotates in the first direction, the hydraulic oil pressure at the first motor port of the rotary motor is greater than the hydraulic oil pressure at the second motor port, and the pressure in the first pipeline is greater than the pressure in the second pipeline.

[0027] When the main valve closes, it stops supplying oil to the rotary motor. Due to inertia, the rotary platform continues to rotate in the first direction. At this time, the rotary motor operates as a pump, increasing the hydraulic oil pressure at the second motor port and the pressure in the second pipeline until the rotary platform stops. At this point, the pressure at the second motor port is greater than the pressure at the first motor port. Then, because the hydraulic oil pressure at the second motor port is greater than that at the first motor port, the rotary platform reverses direction, rotating in the opposite direction to the first. The hydraulic oil pressure at the second motor port decreases, while the pressure at the first motor port increases, before reversing back to the first direction. This process repeats until the rotary platform stops.

[0028] In terms of main machine performance, this manifests as a significant reciprocating oscillation of the slewing platform after it stops rotating. This significant oscillation can easily cause mechanical wear on the slewing motor, resulting in a deterioration in the excavator's operating performance.

[0029] To solve the aforementioned technical problem, this utility model provides a valve assembly, comprising: a first directional valve connected between a first pipeline and a second pipeline; a second directional valve connected in series with the first directional valve, wherein the normal position function of one of the second and first directional valves is normally open, and the normal position function of the other directional valve is normally closed; a control unit connected to the control ports of the first and second directional valves to control the switching of the first and second directional valves; the control unit includes: a damping component adapted to delay the reset of one of the first and second directional valves.

[0030] In the valve assembly of this utility model, the damping component is suitable for delaying the reset of one of the first and second directional control valves. The valve assembly is connected between the rotary motor and the main valve of the rotary platform. The first pipeline connects the first motor port of the rotary motor and the first main valve port of the main valve; the second pipeline connects the second motor port of the rotary motor and the second main valve port of the main valve. The damping component controls the switching of the first and second directional control valves according to the relative pressure of the first and second pipelines, so that the reset of one of the first and second directional control valves is delayed compared to the other. This ensures that both the first and second directional control valves are open during the reset delay phase, thereby connecting the first and second pipelines and reducing the pressure difference between them. This improves the reciprocating oscillation problem of the rotary platform, reduces mechanical wear of the rotary motor, and improves operational smoothness. To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0031] Please refer to Figure 1 , Figure 1 The diagram shows a schematic diagram of the pipeline structure of a valve assembly according to some embodiments of the present invention.

[0032] The valve assembly is adapted to connect the rotary motor and the main valve. In the drive oil circuit, the main valve is adapted to change the internal oil circuit connection state by moving the valve core, determining the direction of hydraulic oil flow to the actuator (such as the rotary motor), thereby driving the rotary platform to rotate. The rotary motor is adapted to receive hydraulic oil from the main valve, converting hydraulic energy into mechanical energy to provide power to the rotary platform and other mechanisms, driving the rotary platform to rotate.

[0033] like Figure 1 As shown, a first pipeline A1A and a second pipeline B1B connect the rotary motor and the main valve. The first pipeline A1A connects the first main valve port A1 of the main valve to the first motor port A of the rotary motor. The second pipeline B1B connects the second motor port B of the rotary motor to the second main valve port B1 of the main valve. The first pipeline A1A and the second pipeline B1B enable communication between the main valve port and the motor port, facilitating the transport of hydraulic oil between the main valve and the rotary motor, and enabling the bidirectional rotation of the rotary motor.

[0034] Please continue to refer to this. Figure 1 The valve group includes: a first directional valve 1 connected between the first pipeline A1A and the second pipeline B1B; and a second directional valve 2 connected in series with the first directional valve 1.

[0035] The first directional valve 1 is a hydraulically controlled directional valve, and the second directional valve 2 is also a hydraulically controlled directional valve. The hydraulically controlled directional valve has a first oil port, a second oil port, a control oil port, and a drain port. The control oil port is connected to a control oil circuit, and controls the switching between the first and second oil ports in their normal position and working functions based on the control oil circuit. The drain port connects the spring chamber of the hydraulically controlled directional valve to the return oil port T, allowing the valve core to switch normally. Specifically, in some embodiments of this invention, the first directional valve 1 is a two-position, two-way hydraulically controlled directional valve, and the second directional valve 2 is also a two-position, two-way hydraulically controlled directional valve.

[0036] The normal position functions of the first directional valve 1 and the second directional valve 2 are different. The normal position function of one of the directional valves, the second directional valve 2 and the first directional valve 1, is normally open, while the normal position function of the other directional valve is normally closed.

[0037] In a normally open directional valve, when the control port does not receive a hydraulic control signal, the valve core is in the initial position, the first port and the second port are connected to each other, and the oil can flow freely through the directional valve; when the control port receives a hydraulic control signal, the valve core moves, and the directional valve switches to the working function, so that the first port and the second port are disconnected, cutting off the oil circuit.

[0038] In a normally closed directional valve, when the control oil does not receive a hydraulic control signal, the valve core is in the initial position, and the first and second oil ports are disconnected, preventing the oil from flowing through the directional valve. When the control oil port receives a hydraulic control signal, the directional valve switches to its working function, connecting the first and second oil ports and allowing the oil to flow.

[0039] Specifically, such as Figure 1 In some embodiments shown, the first directional valve 1 is a normally open hydraulically controlled directional valve. The normal position function of the first directional valve 1 is normally open. When the control port of the first directional valve 1 does not receive a hydraulic control signal, the first port and the second port are interconnected. When the control port of the first directional valve 1 receives a hydraulic control signal, the first directional valve 1 switches to its working function, and the oil passage between the first port and the second port is disconnected. The second directional valve 2 is a normally closed hydraulically controlled directional valve. The normal position function of the second directional valve 2 is normally closed. When the control port of the second directional valve 2 does not receive a hydraulic control signal, the first port and the second port are disconnected. When the control port of the second directional valve 2 receives a hydraulic control signal, the second directional valve 2 switches to its working function, and the first port and the second port are interconnected, allowing oil flow.

[0040] When the first reversing valve 1 and the second reversing valve 2 are in their normal position function, the first motor oil port A and the second motor oil port B of the rotary motor are isolated through the second reversing valve 2, which is normally closed in its normal position function; when the first reversing valve 1 and the second reversing valve 2 are in their working function, the first motor oil port A and the second motor oil port B of the rotary motor are isolated through the first reversing valve 1, which is normally open in its normal position function.

[0041] Please continue to refer to this. Figure 1 The valve assembly includes a control unit, which is connected to the control ports of both the first directional valve 1 and the second directional valve 2 to control the switching of the first directional valve 1 and the second directional valve 2. Specifically, the control unit controls the switching of the first directional valve 1 and the second directional valve 2 based on the relative pressure of the first pipeline A1A and the second pipeline B1B.

[0042] The control unit includes a control oil circuit connecting the control ports of the main valve and the hydraulically controlled directional valves. The hydraulically controlled directional valves include a first directional valve 1 and a second directional valve 2. The control oil circuit enables communication between the control ports of the main valve and the first directional valve 1 and the second directional valve 2, facilitating the transport of control oil between them. This allows the control ports of the first directional valve 1 and the second directional valve 2 to receive hydraulic control signals, thereby enabling the directional valves to switch positions.

[0043] The control unit includes a damping component 4, which is adapted to delay the reset of one of the first directional valve 1 and the second directional valve 2.

[0044] The damping component 4 controls the reset of the first reversing valve 1 and the second reversing valve 2 based on the relative pressure of the first pipeline A1A and the second pipeline B1B. This causes the reset of one of the first reversing valve 1 and the second reversing valve 2 to be delayed compared to the other, so that both the first reversing valve 1 and the second reversing valve 2 are in the open state during the reset delay phase. This connects the first pipeline A1A and the second pipeline during the reset delay phase, reducing the pressure difference between the first pipeline A1A and the second pipeline B1B, thereby improving the problem of the rotary platform reciprocating and oscillating.

[0045] In some embodiments of this utility model, the damping component 4 is suitable for delaying the switching of the normally closed directional valve in the first directional valve 1 and the second directional valve 2.

[0046] The damping component 4 is adapted to delay the reset of the normally closed directional valve in the first and second directional valves 1 and 2. Delaying the reset of the normally closed directional valve ensures that when the slewing platform stops turning, the first pipeline A1A and the second pipeline B1B are connected promptly to improve the slewing platform's reciprocating oscillation problem. Simultaneously, it prevents the connection of the first pipeline A1A and the second pipeline B1B when the slewing platform begins turning, thus avoiding the impact of oil leakage on the response speed when the slewing platform begins turning.

[0047] Specifically, such as Figure 1 In some embodiments shown, the first directional valve 1 is a normally open hydraulically controlled directional valve, and the second directional valve 2 is a normally closed hydraulically controlled directional valve; the damping component 4 is adapted to delay the reset of the second directional valve 2.

[0048] For details, please continue to refer to [the website / information]. Figure 1 The damping assembly 4 includes: a one-way valve 5; and a damper 6, wherein the damper 6 is connected in parallel with the one-way valve 5.

[0049] The one-way valve 5 is a one-way valve. When the main valve supplies oil to the rotary motor and the rotary platform rotates in the first direction, the hydraulic oil in the control oil circuit is delivered to the control port of the second directional valve 2 through the one-way valve 5. When the rotary platform stops and reverses, that is, when the rotary platform rotates in the second direction opposite to the first direction, the hydraulic oil in the control oil circuit cannot flow out through the one-way valve 5, but can only flow out through the damper 6 connected in parallel with the one-way valve 5.

[0050] The one-way valve 5 is directed towards the control port of the normally closed directional valve. Specifically, in some embodiments of this invention, the one-way valve 5 is directed towards the control port of the second directional valve 2.

[0051] The damper 6 slows down the flow rate of hydraulic oil from the control port of the second directional valve 2, preventing the pressure at the control port of the second directional valve 2 from dropping rapidly. This increases the time required for the pressure at the control port of the second directional valve 2 to drop to a level that would allow the spring of the second directional valve 2 to push the valve core back to its original position, thus delaying the reset of the second directional valve 2.

[0052] In some embodiments of this invention, the control unit is also adapted to compare the relative magnitudes of the pressure in the first pipeline A1A and the pressure in the second pipeline B1B. Specifically, please refer to further details in some embodiments. Figure 1 The control unit further includes a shuttle valve 3, which is adapted to compare the relative pressure of the first pipeline A1A and the pressure of the second pipeline B1B, thereby drawing control oil from the pipeline with the higher pressure to the hydraulic directional valve to reverse it.

[0053] The shuttle valve 3 has a first input port 31, a second input port 32 and an output port 33. The first input port 31 is connected to one of the first pipeline A1A and the second pipeline B1B, and the second input port 32 is connected to the other of the first pipeline A1A and the second pipeline B1B.

[0054] The first input port 31 is adapted to be connected to one of the first main valve port A1 and the second main valve port B1, and the second input port 32 is adapted to be connected to the other of the first main valve port A1 and the second main valve port B1, so as to compare the relative magnitude of the hydraulic oil pressure in the first pipeline and the second pipeline.

[0055] Specifically, in some embodiments of this utility model, the first input port 31 is connected to the first pipeline A1A, and the second input port 32 is connected to the second pipeline B1B.

[0056] Specifically, in some embodiments of this utility model, the first input port 31 is adapted to be connected to the first main valve port A1, and the second input port 32 is adapted to be connected to the second main valve port B1. The output port 33 is adapted to be connected to the control port of the first directional valve 1 and the control port of the second directional valve 2.

[0057] The main valve supplies oil to the rotary motor, causing the rotary platform to rotate in the first direction. In the drive oil circuit, hydraulic oil is input to the rotary motor from port A1 and returns to the main valve from port B1. The main valve also supplies oil to the control oil circuit. In the control oil circuit, hydraulic oil is transported via shuttle valve 3 to the control ports of the first directional valve 1 and the second directional valve 2. When the control ports of the first directional valve 1 and the second directional valve 2 receive the hydraulic control signal, the first directional valve 1 and the second directional valve 2 switch to their working functions.

[0058] Specifically, hydraulic oil is input into the first pipeline A1A and the second pipeline B1B. When the pressure of the hydraulic oil in the first pipeline A1A is higher than the pressure of the hydraulic oil in the second pipeline B1B, the first input port 31 of the shuttle valve 3 is connected to the first main valve port A1. The hydraulic oil in the control circuit is input into the first directional valve 1 and the second directional valve 2 through the first main valve port A1. When the pressure of the hydraulic oil input into the first directional valve 1 and the second directional valve 2 is greater than the spring force of the first directional valve 1 and the second directional valve 2, the first directional valve 1 and the second directional valve 2 switch. Among them, a part of the hydraulic oil flows directly to the first directional valve 1 (a hydraulically controlled directional valve with a normally open function), and a part of the hydraulic oil first flows through the check valve 5 to the second directional valve 2 (a hydraulically controlled directional valve with a normally closed function). The first directional valve 1 and the second directional valve 2 switch simultaneously.

[0059] When the main valve is closed, it stops supplying oil to the rotary motor. Due to inertia, the rotary platform continues to rotate in the first direction. The pressure of the hydraulic oil at the second motor port B gradually increases, and the pressure of the second pipeline B1B gradually increases. The pressure at the second motor port B is greater than the pressure at the first motor port A, and the pressure of the second pipeline B1B is greater than the pressure of the first pipeline A1A.

[0060] When the pressure of the second pipeline B1B is greater than the pressure of the first pipeline A1A, the second input port 32 of the shuttle valve 3 is connected to the second main valve port B1, connecting the second pipeline B1B to the control oil circuit. The second pipeline B1B, with its higher pressure, continues to supply control hydraulic oil to the control oil circuit. The hydraulic oil in the control oil circuit is transported through the second pipeline B1B to the second input port 32 of the shuttle valve 3, and then through the second input port 32 to the control ports of the first directional valve 1 and the second directional valve 2, so that the control ports of the first directional valve 1 and the second directional valve 2 continuously receive hydraulic control signals, and the first directional valve 1 and the second directional valve 2 maintain their working functions.

[0061] When the rotary platform stops and reverses, that is, when the rotary platform rotates in a second direction opposite to the first direction, the pressure of the hydraulic oil at the second motor port B gradually decreases, the pressure of the second pipeline B1B gradually decreases, and the hydraulic oil in the control oil circuit flows back to the second pipeline B1B.

[0062] During the process of hydraulic oil flowing back from the control oil circuit to the second pipeline B1B, the pressure of the hydraulic oil in the second pipeline B1B is higher than the pressure of the hydraulic oil in the first pipeline A1A. The second input port 32 of the shuttle valve 3 is connected to the second main valve port B1, connecting the second pipeline B1B with the control oil circuit. The hydraulic oil in the control oil circuit flows out from the control ports of the first directional valve 1 and the second directional valve 2. The hydraulic oil from the control port of the first directional valve 1 flows out directly, while the hydraulic oil from the control port of the second directional valve 2 can only flow out through the damper 6. The damper 6 slows down the speed at which the hydraulic oil flows out from the control port of the second directional valve 2, making the time required for the pressure at the control port of the second directional valve 2 to decrease to the point where the spring pushes the valve core to reset longer. Therefore, the second directional valve 2 delays the reset of the first directional valve 1 to its normal position.

[0063] Specifically, after the slewing platform stops and reverses, the pressure of the hydraulic oil in the second pipeline B1B gradually decreases. The hydraulic oil in the control oil circuit flows back from the control ports of the first directional valve 1 and the second directional valve 2 to the second pipeline B1B. When the pressure of the hydraulic oil in the control ports of the first directional valve 1 and the second directional valve 2 is less than the spring force of the first directional valve 1 and the second directional valve 2, the first directional valve 1 and the second directional valve 2 reset.

[0064] During the delayed reset process of the second directional valve 2, the first directional valve 1 is in its normally open position, while the second directional valve 2 is in its open position. That is, during the delayed phase, the first directional valve 1 and the second directional valve 2 are simultaneously open, thereby connecting the first pipeline A1A and the second pipeline B1B. The connection between the first pipeline A1A and the second pipeline B1B reduces the pressure difference between them, improving the problem of reciprocating oscillation of the slewing platform and enhancing the smoothness of the excavator's slewing motion.

[0065] Furthermore, the damping component 4 is connected to the control port of the second directional valve 2 to delay the reset of the normally closed second directional valve 2. Therefore, when the main valve supplies oil to the rotary motor, the hydraulic oil is directly transported to the first directional valve 1 via the shuttle valve 3, and directly to the second directional valve 2 via the check valve 5. The first directional valve 1 and the second directional valve 2 switch directions simultaneously without passing through the damper 6. Therefore, when the main valve supplies oil to the rotary motor, the damper 6 does not affect the switching of the first directional valve 1 and the second directional valve 2, and will not affect the response time.

[0066] The similarities to the foregoing embodiments will not be repeated here. The differences from the foregoing embodiments are as follows, please refer to... Figure 2 The valve assembly further includes a replenishing valve 7, which is connected between the first pipeline A1A, the second pipeline B1B and the return oil port T, and the return oil port T is connected to the oil tank.

[0067] The oil replenishing valve 7 includes: a first oil replenishing valve 71, which is connected between the first pipeline A1A and the return oil port T; and a second oil replenishing valve 72, which is connected between the second pipeline B1B and the return oil port T.

[0068] The first oil replenishing valve 71 and the second oil replenishing valve 72 are suitable for replenishing oil to the rotary motor, preventing cavitation caused by the formation of cavities due to negative pressure in the rotary motor, and improving the service life of the rotary motor components.

[0069] Specifically, in some embodiments of this utility model, the first oil replenishing valve 71 and the second oil replenishing valve 72 are both one-way valves. The conduction direction of the first oil replenishing valve 71 is towards the first motor oil port A, and the conduction direction of the second oil replenishing valve 72 is towards the second motor oil port B.

[0070] Please continue to refer to this. Figure 2 The valve assembly further includes a safety relief valve 8, which is connected between the first pipeline A1A, the second pipeline B1B and the return oil port T, and the return oil port T is connected to the oil tank.

[0071] The safety relief valve 8 includes: a first safety relief valve 81, which is connected between the first pipeline A1A and the return oil T port; and a second safety relief valve 82, which is connected between the second pipeline B1B and the return oil T port.

[0072] The first safety relief valve 81 and the second safety relief valve 82 are adapted to protect the hydraulic components in the system from damage by excessive pressure.

[0073] The valve assembly can integrate multiple valves as needed, improving system stability and meeting more process production requirements.

[0074] The valve assembly of this invention, implemented through a control oil circuit block and a reversing valve, can be easily and conveniently integrated into the excavator's swing hydraulic system. Furthermore, the valve assembly can integrate more functions (such as the replenishing valve 7 and the safety relief valve 8) through its oil circuit design, allowing for customized design to meet specific needs.

[0075] The valve assembly is suitable for slewing platforms. Specifically, in some embodiments of this invention, the valve assembly is suitable for excavator slewing platforms. In other embodiments, the valve assembly is also suitable for crane slewing platforms and robot slewing platforms, etc.

[0076] Accordingly, embodiments of this utility model also provide a rotary platform; please refer to further details. Figure 2 It includes: a first pipeline A1A, which connects the first motor oil port A of the rotary motor and the first main valve oil port A1 of the main valve; a second pipeline B1B, which connects the second motor oil port B of the rotary motor and the second main valve oil port B1 of the main valve; and a valve group, which is as described in the above embodiment.

[0077] In summary, in the present invention, the damping component 4 of the valve group is suitable for delaying the reset of one of the first directional valve 1 and the second directional valve 2. The valve assembly is connected between the rotary motor and the main valve of the rotary platform. The first pipeline A1A connects the first motor oil port A of the rotary motor and the first main valve oil port A1 of the main valve; the second pipeline B1B connects the second motor oil port B of the rotary motor and the second main valve oil port B1 of the main valve. The damping component 4 controls the switching of the first reversing valve 1 and the second reversing valve 2 according to the relative pressure of the first pipeline A1A and the second pipeline B1B, so that the reset of one of the first reversing valve 1 and the second reversing valve 2 is delayed compared to the other. This ensures that both the first reversing valve 1 and the second reversing valve 2 are open during the delay phase, thereby connecting the first pipeline A1A and the second pipeline B1B during the delay phase. This reduces the pressure difference between the first pipeline A1A and the second pipeline B1B, thereby improving the problem of reciprocating oscillation of the rotary platform and improving the smoothness of the rotary motion. Furthermore, the damping component 4 delays the first reversing... The switching of normally closed directional valves in valve 1 and the second directional valve 2 is delayed, so that when the rotary platform stops turning and reverses for the first time, the first pipeline A1A and the second pipeline B1B are connected in time to improve the reciprocating oscillation problem. At the same time, the connection of the first pipeline A1A and the second pipeline B1B is avoided when the rotary platform starts turning, so as to avoid the response speed being affected by oil leakage when the rotary platform starts turning. In addition, the valve group integrates the first oil replenishing valve 71 and the second oil replenishing valve 72, which are suitable for replenishing oil to the rotary motor, preventing cavitation caused by negative pressure forming a cavity in the rotary motor, and improving the service life of the rotary motor components. The valve group also integrates the first safety relief valve 81 and the second safety relief valve 82, which are suitable for protecting the hydraulic components in the system from damage by excessive pressure.

[0078] 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 valve assembly, characterized in that, include: The first directional valve is connected between the first pipeline and the second pipeline; The second directional valve is connected in series with the first directional valve. The normal position function of one of the second directional valves and the first directional valve is normally open, and the normal position function of the other directional valve is normally closed. A control unit is connected to the control ports of the first directional valve and the second directional valve to control the switching of the first directional valve and the second directional valve. The control unit includes a damping component adapted to delay the reset of one of the first directional valve and the second directional valve.

2. The valve assembly as described in claim 1, characterized in that, The damping component is suitable for delaying the reset of the normally closed directional valve in the first and second directional valves.

3. The valve assembly as described in claim 2, characterized in that, The damping component is connected to the control port of the directional valve in the first and second directional valves, where the normal position function is normally closed.

4. The valve assembly as described in claim 1, characterized in that, The damping component includes: One-way valve; A damper, which is connected in parallel with the one-way valve.

5. The valve assembly as described in claim 4, characterized in that, The damping component is connected to the control port of the directional valve in the first and second directional valves, which is normally closed. The one-way valve is directed towards the control port of the directional valve.

6. The valve assembly as claimed in claim 1, characterized in that, The control unit includes a shuttle valve having a first input port, a second input port, and an output port, wherein the first input port is connected to the first pipeline, and the second input port is connected to the second pipeline.

7. The valve assembly as claimed in claim 1, characterized in that, Also includes: The oil replenishing valve is connected between the first pipeline, the second pipeline and the return oil T-port, and the return oil T-port is connected to the oil tank.

8. The valve assembly as claimed in claim 7, characterized in that, The oil replenishment valve includes: a first oil replenishment valve, which is connected between the first pipeline and the return oil T port; The second oil replenishing valve is connected between the second pipeline and the return oil T port.

9. The valve assembly as claimed in claim 1, characterized in that, Also includes: A safety relief valve is connected between the first pipeline, the second pipeline, and the return oil T-port, which is connected to the oil tank.

10. The valve assembly as claimed in claim 9, characterized in that, The safety relief valve includes: a first safety relief valve, which is connected between the first pipeline and the return oil T-port; The second safety relief valve is connected between the second pipeline and the return oil T port.

11. A rotary platform, characterized in that, include: The first pipeline connects the first motor oil port of the rotary motor and the first main valve oil port of the main valve. The second pipeline connects the second motor oil port of the rotary motor and the second main valve oil port of the main valve. A valve assembly as described in any one of claims 1 to 10.

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