Pilot control valve group

Abstract

A pilot control valve group comprises a pressure reducing valve, a pilot valve, a pilot valve, a pilot valve, a pilot valve, a pilot valve, a pilot valve, a pilot valve, a pilot valve and a pilot valve, the filter comprises a filter inlet and a filter outlet, and the filter inlet is connected with the pressure reducing valve outlet; an outlet of the filter is connected with the first electromagnetic directional valve and the second electromagnetic directional valve. According to the pilot control valve group provided by the embodiment of the utility model, the cost can be reduced, and the fault occurrence rate can be reduced.

Description

Technical Field

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

[0002] Mini excavators or some mobile construction machinery typically use pilot control valve groups to convert the high-pressure hydraulic fluid supplied by the pump into low-pressure hydraulic fluid, and then supply the low-pressure hydraulic fluid to the control handle or motor of the machinery to achieve control of the machinery and high and low speed movement.

[0003] However, current pilot control valve assemblies still have problems such as high cost and susceptibility to failure. Utility Model Content

[0004] The technical problem solved by this utility model is to provide a pilot control valve assembly that can reduce costs and the occurrence of failures.

[0005] To solve the above-mentioned technical problems, this utility model provides a pilot control valve assembly, including: a pressure reducing valve, the pressure reducing valve including a pressure reducing valve inlet and a pressure reducing valve outlet, the pressure reducing valve inlet being connected to an oil inlet; a filter, the filter including a filter inlet and a filter outlet, the filter inlet being connected to the pressure reducing valve outlet; a first solenoid directional valve and a second solenoid directional valve, the filter outlet being connected to the first solenoid directional valve and the second solenoid directional valve.

[0006] Optionally, it may also include an accumulator, which is connected to the outlet of the pressure reducing valve.

[0007] Optionally, it also includes a one-way valve, which has a one-way valve inlet and a one-way valve outlet. The one-way valve inlet is connected to the outlet of the pressure reducing valve, and the one-way valve outlet is connected to the accumulator and the filter inlet.

[0008] Optionally, it also includes an overflow valve, which includes an overflow valve inlet and an overflow valve outlet. The overflow valve inlet is connected to the outlet of the pressure reducing valve, and the overflow valve outlet is connected to the oil return port.

[0009] Optionally, it also includes a valve block, on which the pressure reducing valve, the first solenoid directional valve, the second solenoid directional valve, the check valve, and the relief valve are mounted, and the filter is pipe-connected to the valve block.

[0010] Optionally, the pressure reducing valve further includes an oil drain port, which is connected to the oil return port.

[0011] Optionally, the set pressure of the relief valve is greater than the set pressure of the pressure reducing valve.

[0012] Optionally, the difference between the set pressure of the relief valve and the set pressure of the pressure reducing valve is in the range of 5 bar to 15 bar.

[0013] Optionally, the first solenoid directional valve is a two-position three-way solenoid directional valve. The first solenoid directional valve includes a first oil inlet, a second oil inlet, and a first oil outlet. The first oil inlet is connected to the filter outlet, the second oil inlet is connected to the return oil port, and the first oil outlet is connected to the first working oil port.

[0014] Optionally, the second solenoid directional valve is a two-position three-way solenoid directional valve. The second solenoid directional valve includes a third oil inlet, a fourth oil inlet, and a second oil outlet. The third oil inlet is connected to the filter outlet, the fourth oil inlet is connected to the return oil port, and the second oil outlet is connected to the second working oil port.

[0015] Compared with the prior art, the technical solution of this utility model embodiment has the following beneficial effects:

[0016] The pilot control valve assembly provided by this technical solution places the filter after the pressure reducing valve. The high-pressure oil is reduced and converted into low-pressure oil before entering the filter. This can reduce the impact of the oil on the filter, thereby reducing the probability of filter failure. In addition, the filter can be a low-pressure filter, which helps to reduce costs.

[0017] Furthermore, it also includes a valve block, on which the pressure reducing valve, the first solenoid directional valve, the second solenoid directional valve, the check valve, and the relief valve are mounted. The filter is pipe-connected to the valve block. The integrated mounting of the pressure reducing valve, the first solenoid directional valve, and other valve bodies on the valve block improves the integration of the pilot control valve assembly. The pipe-connected filter to the valve block reduces the size of the valve block, facilitating its installation, and also makes filter assembly and disassembly easier. Attached Figure Description

[0018] Figure 1 This is a hydraulic system diagram of the pilot control valve group in one embodiment of this utility model. Detailed Implementation

[0019] As described in the background section, pilot control valve assemblies are commonly used in excavators or mobile construction machinery. Current pilot control valve assemblies typically place the filter between the oil inlet and the pressure reducing valve; that is, the high-pressure oil supplied by the pump first passes through the filter before entering the pressure reducing valve. Because the filter must withstand the high-pressure oil, a high-pressure-resistance filter is required, which is costly. Furthermore, prolonged exposure to high-pressure oil can easily damage the filter, leading to pilot control valve assembly failure.

[0020] To address the aforementioned problems, this utility model provides a pilot control valve assembly, including a pressure reducing valve, a filter, a first solenoid directional valve, and a second solenoid directional valve. The filter inlet is connected to the pressure reducing valve outlet, and the filter outlet is connected to both the first and second solenoid directional valves. Filtered oil enters both the first and second solenoid directional valves, preventing contaminants from affecting their control accuracy and reducing system failure rate. Furthermore, the high-pressure oil is depressurized before entering the filter, avoiding prolonged exposure to high pressure and reducing filter damage. This also allows for the use of a low-pressure filter, which helps reduce costs.

[0021] To make the above-mentioned objectives, features and beneficial effects 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.

[0022] Figure 1 This is a hydraulic system diagram of the pilot control valve group in one embodiment of this utility model.

[0023] refer to Figure 1 The pilot control valve group 10 includes a pressure reducing valve CT1, a relief valve CT2, a first solenoid directional valve CT3, a second solenoid directional valve CT4, a check valve CT5, an accumulator CT6, and a filter CT7.

[0024] Specifically, the pressure reducing valve CT1 includes a pressure reducing valve inlet 11, a pressure reducing valve outlet 12, and an oil drain port 13. The pressure reducing valve inlet 11 is connected to the oil inlet P, and the oil drain port 13 is connected to the oil return port T. The high-pressure oil output by the pump enters the pressure reducing valve CT1 through the oil inlet P, is reduced to low-pressure oil by the pressure reducing valve CT1, and is output through the pressure reducing valve outlet 12.

[0025] The filter CT7 includes a filter inlet 71 and a filter outlet 72. The filter inlet 71 is connected to the outlet 12 of the pressure reducing valve, and the filter outlet 72 is connected to the first solenoid directional valve CT3 and the second solenoid directional valve CT4. The filter CT7 is installed after the pressure reducing valve CT1. High-pressure oil enters the filter CT7 after pressure reduction, so the filter CT7 does not need to withstand high pressure again. A low-pressure filter can be used, which helps reduce costs and avoids filter damage caused by prolonged exposure to high-pressure oil, thus extending the filter's service life.

[0026] In this embodiment, the first electromagnetic directional valve CT3 is a two-position three-way electromagnetic directional valve. The first electromagnetic directional valve CT3 includes a first oil inlet 31, a second oil inlet 32 ​​and a first oil outlet 33. The first oil inlet 31 is connected to the filter outlet 72, the second oil inlet 32 ​​is connected to the return oil port T, and the first oil outlet 33 is connected to the first working oil port Bv.

[0027] In this embodiment, the second electromagnetic directional valve CT4 is a two-position three-way electromagnetic directional valve. The second electromagnetic directional valve CT4 includes a third oil inlet 41, a fourth oil inlet 42, and a second oil outlet 43. The third oil inlet 41 is connected to the filter outlet 72, the fourth oil inlet 42 is connected to the return oil port T, and the second oil outlet 43 is connected to the second working oil port Pr.

[0028] In this embodiment, the first solenoid directional valve CT3 and the second solenoid directional valve CT4 have high precision requirements and are sensitive to oil impurities. Therefore, a filter CT7 is installed before the first solenoid directional valve CT3 and the second solenoid directional valve CT4 to filter out oil impurities, which can protect the first solenoid directional valve CT3 and the second solenoid directional valve CT4 from damage.

[0029] In this embodiment, when the first electromagnetic reversing valve CT3 is energized, the first oil inlet 31 and the first oil outlet 33 are connected, and oil is output from the first working oil port Bv. The first working oil port Bv is used to control the high and low speed switching of the motor of the mechanical equipment, thereby controlling the high and low speed movement of the mechanical equipment.

[0030] In this embodiment, when the second electromagnetic reversing valve CT4 is energized, the third oil inlet 41 and the second oil outlet 43 are connected, and oil is output from the second working oil port Pr. The second working oil port Pr is connected to the control handles at various parts of the mechanical equipment, controlling the main valve to switch directions and thus controlling the actuator to perform various actions.

[0031] When the first electromagnetic reversing valve CT3 is not energized, the first oil inlet 31 and the first oil outlet 33 are disconnected, and the second oil inlet 32 ​​and the first oil outlet 33 are connected.

[0032] When the second electromagnetic reversing valve CT4 is not energized, the third oil inlet 41 and the second oil outlet 43 are disconnected, and the fourth oil inlet 42 and the second oil outlet 43 are connected.

[0033] Continue to refer to Figure 1 The overflow valve CT2 includes an overflow valve inlet 21 and an overflow valve outlet 22. The overflow valve inlet 21 is connected to the pressure reducing valve outlet 12, and the overflow valve outlet 22 is connected to the oil return port T.

[0034] In this embodiment, the overflow valve CT2 can protect the safety of the pilot control valve group system. When the pressure reducing valve CT1 is stuck and the output oil pressure rises abnormally, the overflow valve CT2 opens, and the excess oil is discharged through the overflow valve CT2 and enters the oil tank from the return port T.

[0035] In this embodiment, the set pressure of the relief valve CT2 is higher than the set pressure of the pressure reducing valve CT1. This higher set pressure ensures that if the pressure reducing valve CT1 malfunctions, the relief valve CT2 can release system pressure.

[0036] Specifically, the difference between the set pressure of the relief valve CT2 and the set pressure of the pressure reducing valve CT1 is 5 bar to 15 bar.

[0037] Continue to refer to Figure 1 The one-way valve CT5 includes a one-way valve inlet 51 and a one-way valve outlet 52. The one-way valve inlet 51 is connected to the pressure reducing valve outlet 12, and the one-way valve outlet 52 is connected to the accumulator CT6 and the filter inlet 71.

[0038] In this embodiment, the one-way valve CT5 is used to make the oil flow from the pressure reducing valve outlet 12 towards the accumulator CT6. After the oil is output through the pressure reducing valve outlet 12, it flows through the one-way valve CT5 to the accumulator CT6 and the filter CT7.

[0039] In this embodiment, the accumulator CT6 absorbs the oil shock of the hydraulic system, reducing the pressure pulsation of the system. The pressure stored in the accumulator CT6 will not leak through the return port T due to the pressure holding effect of the check valve CT5. Instead, it will be released through the first solenoid directional valve CT3 and the second solenoid directional valve CT4.

[0040] When a fault occurs in the hydraulic system where the pilot control valve group is located, no oil enters through the inlet P. The accumulator CT6 can serve as an emergency power source, and the oil stored in it can be used to provide power to the system, preventing the mechanical equipment from suddenly stopping.

[0041] In this embodiment, the high-pressure oil output from the pump is input to the pressure reducing valve CT1 through the inlet P. The pressure reducing valve CT1 reduces the pressure to low-pressure oil, which then flows through the check valve CT5 to the accumulator CT6 and the filter CT7. After impurities are filtered out by the filter CT7, the low-pressure oil flows to the first solenoid directional valve CT3 and the second solenoid directional valve CT4. When the first solenoid directional valve CT3 is energized, the first inlet 31 and the first outlet 33 are connected, and the oil flows to the first working port Bv, controlling the high and low speed switching of the motor. When the second solenoid directional valve CT4 is energized, the second inlet 41 and the second outlet 43 are connected, and the oil flows to the second working port Pr, outputting to the control handle to control various actions of the equipment. When the pressure reducing valve CT1 malfunctions or the output oil pressure is abnormal, the relief valve CT2 opens, and excess oil flows to the return port T through the relief valve CT2, ensuring the safety of the hydraulic system.

[0042] In this embodiment, the pilot control valve group 10 further includes a valve block (not shown), the pressure reducing valve CT1, the first solenoid directional valve CT3, the second solenoid directional valve CT4, the one-way valve CT5, and the relief valve CT2 are integrated and installed on the valve block, and the filter CT7 is pipe-connected to the valve block.

[0043] In this embodiment, the pressure reducing valve CT1 and other valves are integrated and installed on the valve block, which helps to improve the integration. Furthermore, the filter CT7 is externally connected to the valve block through a pipeline, which allows for greater flexibility in the installation position of the filter CT7. On the one hand, this facilitates the disassembly, replacement, or maintenance of the filter CT7; on the other hand, it can also reduce the volume of the integrated valve block, saving installation space and facilitating the installation of the valve block.

[0044] In this embodiment, the accumulator CT6 is also externally connected to the valve block.

[0045] 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 control valve assembly, characterized in that, include: A pressure reducing valve, comprising a pressure reducing valve inlet and a pressure reducing valve outlet, wherein the pressure reducing valve inlet is connected to an oil inlet. A filter, comprising a filter inlet and a filter outlet, wherein the filter inlet is connected to the outlet of the pressure reducing valve; A first electromagnetic reversing valve and a second electromagnetic reversing valve, wherein the filter outlet is connected to the first electromagnetic reversing valve and the second electromagnetic reversing valve.

2. The pilot control valve assembly as described in claim 1, characterized in that, It also includes an accumulator, which is connected to the outlet of the pressure reducing valve.

3. The pilot control valve assembly as described in claim 2, characterized in that, It also includes a one-way valve, which has a one-way valve inlet and a one-way valve outlet. The one-way valve inlet is connected to the outlet of the pressure reducing valve, and the one-way valve outlet is connected to the accumulator and the filter inlet.

4. The pilot control valve assembly as described in claim 3, characterized in that, It also includes an overflow valve, which has an overflow valve inlet and an overflow valve outlet. The overflow valve inlet is connected to the outlet of the pressure reducing valve, and the overflow valve outlet is connected to the oil return port.

5. The pilot control valve assembly as described in claim 4, characterized in that, It also includes a valve block, on which the pressure reducing valve, the first solenoid directional valve, the second solenoid directional valve, the check valve, and the overflow valve are integrated and installed, and the filter is connected to the valve block in a tubular manner.

6. The pilot control valve assembly as described in claim 4, characterized in that, The pressure reducing valve also includes an oil drain port, which is connected to the oil return port.

7. The pilot control valve assembly as described in claim 6, characterized in that, The set pressure of the overflow valve is greater than the set pressure of the pressure reducing valve.

8. The pilot control valve assembly as described in claim 7, characterized in that, The difference between the set pressure of the relief valve and the set pressure of the pressure reducing valve is in the range of 5 bar to 15 bar.

9. The pilot control valve assembly as described in claim 4, characterized in that, The first electromagnetic directional valve is a two-position three-way electromagnetic directional valve. The first electromagnetic directional valve includes a first oil inlet, a second oil inlet, and a first oil outlet. The first oil inlet is connected to the filter outlet, the second oil inlet is connected to the return oil port, and the first oil outlet is connected to the first working oil port.

10. The pilot control valve assembly as described in claim 4, characterized in that, The second electromagnetic directional valve is a two-position three-way electromagnetic directional valve. The second electromagnetic directional valve includes a third oil inlet, a fourth oil inlet, and a second oil outlet. The third oil inlet is connected to the filter outlet, the fourth oil inlet is connected to the return oil port, and the second oil outlet is connected to the second working oil port.

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