Multi-stage hydraulic control system
Through a multi-stage hydraulic control system, utilizing a combination of low-pressure and high-pressure oil circuits, combined with a pressure reducing valve, a relief valve, and a solenoid valve, rapid adjustment of the cylinder pressure is achieved, solving the problem of slow response speed of a single-stage hydraulic system and simplifying the system structure.
Patent Information
- Application Number
- CN202422637268.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2025-10-14
- Estimated Expiration
- 2034-10-30
AI Technical Summary
When switching between different pressures, the single-stage hydraulic control system needs to be adjusted to an interrupted state before switching. The response speed is slow and cannot meet the needs of rapid adjustment.
A multi-stage hydraulic control system is adopted, including low-pressure oil circuit and high-pressure oil circuit, and a pressure reducing valve, overflow valve, one-way valve and solenoid valve are set. The oil circuit switching is controlled by the solenoid valve to achieve rapid adjustment of the cylinder pressure.
It realizes the rapid adjustment of the oil pressure in the oil cylinder, especially the process from high pressure to low pressure without adjusting the gear, which reduces the system complexity and response speed.
Smart Images
Figure CN223434545U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to control engineering field especially a kind of multistage pressure control system. BACKGROUND
[0002] Hydraulic control system is the device using liquid power to change the working state of operating object, and it has wide application in mechanical, electronic and other technical fields. With the development of hydraulic industry, single-stage hydraulic control system sometimes cannot meet the use requirements. For example, single-stage hydraulic control system needs to be adjusted to the interrupt state before switching to other pressure gear, and the response speed is slow. At this time, multistage hydraulic control system can quickly adjust oil pressure and realize fast response. SUMMARY
[0003] The utility model aims at providing a kind of multistage pressure control system to solve the problems existing in the prior art, realize the quick regulation of the oil pressure of oil cylinder, especially the process of adjusting from high pressure to low pressure without adjusting gear, can directly reduce pressure.
[0004] To achieve the above object, the utility model provides the following scheme:
[0005] The utility model provides a kind of multistage hydraulic control system, including low pressure oil circuit and high pressure oil circuit, the low pressure oil circuit is connected with the oil pump for providing oil and the oil cylinder of bearing load, be provided with the pressure reducing valve for reducing the pressure value of oil to first pressure on the low pressure oil circuit;The high pressure oil circuit is connected with the oil pump and oil cylinder, and high pressure overflow valve for adjusting oil pressure to keep to second pressure is provided on the first branch parallel to the high pressure oil circuit, and the numerical value of the second pressure is greater than the numerical value of the first pressure;It further includes oil circuit switching device for switching the low pressure oil circuit and the high pressure oil circuit;Low pressure overflow valve for reducing the pressure value of oil from second pressure to third pressure is provided on the second branch parallel to the high pressure oil circuit, and pressure reduction switch for controlling the on-off of the second branch is installed on the second branch.
[0006] Preferably, a first check valve is further provided on the low pressure oil circuit, the first check valve is arranged between the pressure reducing valve and oil cylinder, and the oil outlet end of the pressure reducing valve is communicated with the oil inlet end of the first check valve;Second check valve is further provided on the high pressure oil circuit, the second check valve is arranged between the high pressure switch and the oil cylinder, and the oil inlet end of the high pressure switch is communicated with the oil inlet end of the second check valve.
[0007] Preferably, the oil circuit switching device is a first electromagnetic valve, the oil inlet end of the first electromagnetic valve is communicated with the oil pump, the first oil outlet end of the first electromagnetic valve is communicated with the oil inlet end of the pressure reducing valve, and the second oil outlet end of the first electromagnetic valve is communicated with the oil inlet end of the second check valve.
[0008] Preferably, the oil return end of the pressure reducing valve is communicated with an oil tank, the oil return end of the high pressure overflow valve is communicated with the oil tank, and the oil return end of the low pressure overflow valve is communicated with the oil tank.
[0009] Preferably, the oil return end of the pressure reducing valve and the oil return end of the high pressure overflow valve are connected in parallel on a first oil return pipeline.
[0010] Preferably, the pressure reducing switch is a second electromagnetic valve, the oil inlet end of the second electromagnetic valve is communicated with the high pressure oil pipeline, the first oil outlet end of the second electromagnetic valve is connected with a first sealing oil pipeline, and the low pressure overflow valve is arranged on a branch of the first sealing oil pipeline.
[0011] Preferably, the second oil outlet end of the second electromagnetic valve is connected with a second sealing oil pipeline, and a branch of the second sealing oil pipeline is communicated with the oil tank.
[0012] Preferably, the oil return end of the low pressure overflow valve is communicated with the branch of the second sealing oil pipeline.
[0013] Preferably, the first electromagnetic valve is a three-position four-way electromagnetic valve, and the oil return end of the first electromagnetic valve is communicated with the oil tank.
[0014] Preferably, the second electromagnetic valve is a three-position four-way electromagnetic valve, and the oil return end of the second electromagnetic valve is communicated with the oil tank.
[0015] The utility model discloses relative to prior art has obtained following technical effect:
[0016] The utility model discloses provide a multistage pressure control system, realize the quick regulation of the oil pressure of oil cylinder, especially from high pressure adjustment to low pressure process need not adjusting gear, can directly carry out pressure reduction.
[0017] The utility model discloses relative to prior art has obtained following technical effect:
[0018] 1, the utility model discloses adopt three -position four -way electromagnetic valve control low pressure oil circuit and high pressure oil circuit, only use a valve body to be able to switch the low pressure and high pressure state of oil cylinder, reduce the number of oil inlet pipeline, reduce the complexity of multistage pressure control system.
[0019] 2, the utility model discloses that the pressure reducing pipeline is communicated three -position four -way electromagnetic valve, through adjusting the valve position of three -position four -way electromagnetic valve, both can realize the pressure of oil cylinder is adjusted to specified pressure value, also can directly unload oil cylinder pressure, and the adjustment speed is fast. BRIEF DESCRIPTION OF DRAWINGS
[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without creative labor.
[0021] Figure 1 The hydraulic control schematic diagram of the multi-stage hydraulic control system in the embodiments of the present application.
[0022] Among them, 1, pressure reducing valve; 2, high pressure overflow valve; 3, low pressure overflow valve; 4, first check valve; 5, second check valve; 6, first electromagnetic valve; 7, second electromagnetic valve. Specific embodiments
[0023] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.
[0024] The purpose of the present application is to provide a multi-stage pressure control system to solve the problems in the prior art, to realize the rapid regulation of the oil pressure of the oil cylinder, and to directly reduce the pressure without adjusting the gear position during the process of adjusting from high pressure to low pressure.
[0025] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.
[0026] As Figure 1As shown, the utility model provides a multi-stage hydraulic control system, including a low-pressure oil circuit and a high-pressure oil circuit. The low-pressure oil circuit is connected to an oil pump for providing oil and an oil cylinder that carries a load. A pressure reducing valve 1 is provided on the low-pressure oil circuit for reducing the pressure value of the oil to a first pressure. Since the pressure of the oil output from the oil pump may be higher than the working pressure of the oil cylinder, the function of the low-pressure oil circuit is to directly reduce the pressure of the oil output from the oil pump, thereby realizing low-pressure control of the oil cylinder during the rising process. The high-pressure oil circuit connects the oil pump and the oil cylinder. A high-pressure relief valve 2 is provided on a first branch connected in parallel with the high-pressure oil circuit for adjusting the oil pressure to maintain it at a second pressure. The value of the second pressure is greater than the value of the first pressure. The high-pressure oil circuit is used to supply high-pressure oil to the oil cylinder. Since the high-pressure relief valve 2 is connected in parallel with the high-pressure oil circuit, when the oil pressure is not higher than the maximum pressure value of the high-pressure relief valve 2, the high-pressure relief valve 2 will not reduce the pressure, and the oil pressure in the oil circuit remains unchanged. When the oil pressure is higher than the maximum pressure value of the high-pressure relief valve 2, the high-pressure relief valve 2 will deflate and reduce the pressure, so that the oil pressure in the entire oil circuit is reduced to the maximum pressure value of the high-pressure relief valve 2, realizing high-pressure oil supply and high-pressure control of the oil cylinder. The utility model also includes an oil circuit switching device for switching between the low-pressure oil circuit and the high-pressure oil circuit, which is used to switch between the high-pressure control state and the low-pressure control state of the oil cylinder. A low-pressure relief valve 3 is provided on the second branch connected in parallel with the high-pressure oil circuit, which is used to reduce the pressure value of the oil from the second pressure to the third pressure. A pressure-reducing switch is installed on the second branch to control the on and off of the second branch. The low-pressure relief valve 3 is connected in parallel with the high-pressure oil circuit and the high-pressure relief valve 2. The working principle of the low-pressure relief valve 3 is the same as that of the high-pressure relief valve 2, except that the maximum pressure value of the low-pressure relief valve 3 is lower than the maximum pressure value of the high-pressure relief valve 2. When the oil pressure of the cylinder needs to be reduced, the pressure-reducing switch is opened to connect the low-pressure relief valve 3 with the high-pressure oil circuit. At this time, the low-pressure relief valve 3 will deflate and reduce the pressure, so that the oil pressure in the entire high-pressure oil circuit is reduced to the maximum pressure value of the low-pressure relief valve 3, thereby achieving the purpose of reducing the oil pressure during the descending process.
[0027] like Figure 1 As shown, a first one-way valve 4 is also provided on the low-pressure oil circuit, and the first one-way valve 4 is arranged between the pressure reducing valve 1 and the oil cylinder, and the oil outlet end of the pressure reducing valve 1 is connected to the oil inlet end of the first one-way valve 4. A second one-way valve 5 is also provided on the high-pressure oil circuit, and the second one-way valve 5 is arranged between the high-pressure switch and the oil cylinder, and the high-pressure switch is connected to the oil inlet end of the second one-way valve 5. If the oil pump fails and cannot maintain the oil pressure, the first one-way valve 4 and the second one-way valve 5 can both prevent the pressure oil from flowing back, thereby ensuring the oil circuit pressure so that the oil cylinder continues to bear the load.
[0028] like Figure 1As shown, the oil path switching device is a first electromagnetic valve 6, the oil inlet end of the first electromagnetic valve 6 is communicated with the oil pump, the first oil outlet end of the first electromagnetic valve 6 is communicated with the oil inlet end of the pressure reducing valve 1, the second oil outlet end of the first electromagnetic valve 6 is communicated with the oil inlet end of the second check valve 5, and the on-off of the low pressure oil path and the high pressure oil path is realized by adjusting the valve position of the first electromagnetic valve 6.
[0029] As shown in Figure 1 , the oil return end of the pressure reducing valve 1 is communicated with the oil tank, the oil return end of the high pressure overflow valve 2 is communicated with the oil tank, and the oil return end of the low pressure overflow valve 3 is communicated with the oil tank.
[0030] As shown in Figure 1 , the oil return end of the pressure reducing valve 1 and the oil return end of the high pressure overflow valve 2 are connected in parallel on the first oil return pipeline.
[0031] As shown in Figure 1 , the pressure reducing switch is a second electromagnetic valve 7, the oil inlet end of the second electromagnetic valve 7 is communicated with the high pressure oil path, the first oil outlet end of the second electromagnetic valve 7 is connected with the first sealing oil path, the low pressure overflow valve 3 is arranged on the branch of the first sealing oil path, and the opening and closing of the pressure reducing oil path and the opening and closing of the pressure relief oil return oil path are realized by adjusting the valve position of the second electromagnetic valve 7.
[0032] As shown in Figure 1 , the second oil outlet end of the second electromagnetic valve 7 is connected with the second sealing oil path, and the branch of the second sealing oil path is communicated with the oil tank.
[0033] As shown in Figure 1 , the oil return end of the low pressure overflow valve 3 is communicated with the branch of the second sealing oil path.
[0034] As shown in Figure 1 , the first electromagnetic valve 6 is a three-position four-way electromagnetic valve, the oil return end of the first electromagnetic valve 6 is communicated with the oil tank, the P end of the first electromagnetic valve 6 is connected with the oil pump, the first electromagnetic valve 6 keeps the middle position mechanism when not electrified, when the electromagnet b is electrified, the oil enters the oil cylinder through the first electromagnetic valve 6, the pressure reducing valve 1 and the first check valve 4, when the electromagnet a is electrified, the oil enters the oil cylinder through the first electromagnetic valve 6 and the second check valve 5, and the oil pressure or high pressure oil supply is completed under the control of the high pressure overflow valve 2.
[0035] As shown in Figure 1 , the second electromagnetic valve 7 is a three-position four-way electromagnetic valve, the oil return end of the second electromagnetic valve 7 is communicated with the oil tank, the P end of the second electromagnetic valve 7 is connected with the second branch of the high pressure oil path, the second electromagnetic valve 7 keeps the middle position mechanism when not electrified, when the electromagnet b is electrified, the oil enters the first sealing oil path and the branch of the first sealing oil path through the second electromagnetic valve 7, the low pressure overflow valve 3 starts to work to reduce the oil pressure in the high pressure oil path, when the electromagnet a is electrified, the oil enters the second sealing oil path and returns to the oil tank from the branch of the second sealing oil path through the second electromagnetic valve 7, and the control of the oil cylinder is released.
[0036] The principles and implementation modes of the present application are described by using specific examples in the present application, and the above examples are only used to help understand the method and core idea of the present application; meanwhile, for the general technical personnel in the field, the specific implementation modes and application ranges will be changed according to the idea of the present application. In conclusion, the content of the present application should not be understood as a limitation of the present application.
Claims
1. A multi-stage hydraulic control system, characterized in that: The invention comprises a low-pressure oil circuit and a high-pressure oil circuit, wherein the low-pressure oil circuit is connected to an oil pump for providing oil and an oil cylinder for carrying a load, and a pressure reducing valve (1) is provided on the low-pressure oil circuit for reducing the pressure value of the oil to a first pressure; The high-pressure oil circuit is connected to the oil pump and the oil cylinder, and a high-pressure relief valve (2) is provided on a first branch circuit connected in parallel with the high-pressure oil circuit for adjusting the oil pressure to maintain a second pressure, wherein the value of the second pressure is greater than the value of the first pressure; Also included is an oil circuit switching device for switching between the low-pressure oil circuit and the high-pressure oil circuit; A low-pressure relief valve (3) for reducing the pressure of the oil from the second pressure to the third pressure is provided on the second branch connected in parallel with the high-pressure oil circuit, and a pressure reducing switch for controlling the on-off of the second branch is installed on the second branch.
2. The multi-stage hydraulic control system according to claim 1, characterized in that: A first one-way valve (4) is also provided on the low-pressure oil circuit. The first one-way valve (4) is provided between the pressure reducing valve (1) and the oil cylinder, and the oil outlet end of the pressure reducing valve (1) is communicated with the oil inlet end of the first one-way valve (4). A second one-way valve (5) is also provided on the high-pressure oil circuit. The second one-way valve (5) is provided between the high-pressure switch and the oil cylinder. The high-pressure switch and the oil inlet end of the second one-way valve (5) are communicated.
3. The multi-stage hydraulic control system according to claim 2, characterized in that: The oil circuit switching device is a first solenoid valve (6), the oil inlet end of the first solenoid valve (6) is connected to the oil pump, the first oil outlet end of the first solenoid valve (6) is connected to the oil inlet end of the pressure reducing valve (1), and the second oil outlet end of the first solenoid valve (6) is connected to the oil inlet end of the second one-way valve (5).
4. The multi-stage hydraulic control system according to claim 3, characterized in that: The oil return end of the pressure reducing valve (1) is connected to the oil tank, the oil return end of the high-pressure relief valve (2) is connected to the oil tank, and the oil return end of the low-pressure relief valve (3) is connected to the oil tank.
5. The multi-stage hydraulic control system according to claim 4, characterized in that: The oil return end of the pressure reducing valve (1) and the oil return end of the high-pressure relief valve (2) are connected in parallel on the first oil return pipeline.
6. The multi-stage hydraulic control system according to claim 4, characterized in that: The pressure-reducing switch is on the second solenoid valve (7), the oil inlet end of the second solenoid valve (7) is connected to the high-pressure oil circuit, the first oil outlet end of the second solenoid valve (7) is connected to the first sealed oil circuit, and the low-pressure relief valve (3) is arranged on a branch of the first sealed oil circuit.
7. The multi-stage hydraulic control system according to claim 6, characterized in that: The second oil outlet end of the second solenoid valve (7) is connected to a second sealed oil circuit, and a branch of the second sealed oil circuit is connected to the oil tank.
8. The multi-stage hydraulic control system according to claim 7, characterized in that: The oil return end of the low-pressure relief valve (3) is connected to a branch of the second sealing oil circuit.
9. The multi-stage hydraulic control system according to claim 4, characterized in that: The first solenoid valve (6) is a three-position four-way solenoid valve, and the oil return end of the first solenoid valve (6) is connected to the oil tank.
10. The multi-stage hydraulic control system according to any one of claims 6 to 8, characterized in that: The second solenoid valve (7) is a three-position four-way solenoid valve, and the oil return end of the second solenoid valve (7) is connected to the oil tank.