A hydraulic control system and integrated valve group for synchronous lifting of suspension cylinders

Abstract

The present invention discloses a hydraulic control system and an integrated valve group for synchronous lifting of suspension oil cylinders. The integrated valve group includes a three-way compensation valve and four groups of electromagnetic switch valves, an adjustable flow valve, and a pressure compensation valve. The oil inlet of the integrated valve group is connected to the corresponding adjustable flow valve through each group of electromagnetic switch valves, and a pressure compensation valve is installed behind each adjustable flow valve; the non-spring chambers of the four groups of pressure compensation valves are connected to the outlets of the corresponding adjustable flow valves; the spring chambers of the four groups of pressure compensation valves are all connected to the spring chambers of the three-way compensation valves, and the non-spring chambers of the three-way compensation valves are connected to the return oil channel of the integrated valve group. In the hydraulic control system, each group of pressure compensation valves is connected to the corresponding suspension oil cylinder through a suspension control valve group; it can realize the simultaneous lifting of the suspension oil cylinders, the lifting of a single suspension oil cylinder, and the lifting of two suspension oil cylinders, quickly realize the adjustment of different postures of the vehicle, and improve the operation and control performance of the vehicle.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering machinery, and relates to a hydraulic control system and an integrated valve group for synchronous lifting of a suspension oil cylinder. Background Art

[0002] At present, most engineering vehicle suspension systems use oil-gas suspension. Under different road conditions, the suspension can be adjusted to improve the vehicle's passing performance. However, due to the lack of synchronous control design, the existing vehicle suspension system often cannot be adjusted quickly when adjusting the suspension, which seriously affects the vehicle's operational control performance.

[0003] The prior art has the following defects: the prior art solution has no suspension cylinder synchronization design, and the suspension cylinders are connected by free pipe diversion. Since the loads borne by each suspension are different, when two or more suspension cylinders are operated at the same time, the synchronization is extremely poor and there is no speed regulation function. Summary of the invention

[0004] Purpose: In order to overcome the deficiencies in the prior art, the present invention provides a hydraulic control system and an integrated valve group for synchronous lifting of a suspension cylinder.

[0005] Technical solution: To solve the above technical problems, the technical solution adopted by the present invention is:

[0006] An integrated valve group includes a three-way compensation valve and four groups of electromagnetic switch valves, adjustable flow valves, and pressure compensation valves.

[0007] The oil inlet of the integrated valve group is connected to the corresponding adjustable flow valve through the electromagnetic switch valve of each group, and a pressure compensation valve is installed behind each adjustable flow valve;

[0008] The non-spring chambers of the four sets of pressure compensation valves are connected to the outlets of the corresponding adjustable flow valves;

[0009] The spring chambers of the four groups of pressure compensation valves are all connected to the spring chamber of the three-way compensation valve, and the non-spring chamber of the three-way compensation valve is connected to the oil return channel of the integrated valve group.

[0010] The oil inlet of the three-way compensating valve is connected to the oil inlet of the integrated valve group through the oil return channel, and the oil outlet of the three-way compensating valve is connected to the oil return port of the integrated valve group.

[0011] Furthermore, the integrated valve group is characterized in that a one-way valve is provided after each group of pressure compensation valves for obtaining a maximum value load acting on the pressure compensation valve.

[0012] The present invention also provides a hydraulic control system, characterized in that it comprises the above-mentioned integrated valve group, four suspension control valve groups, and four suspension cylinders;

[0013] The pressure compensation valve of each group of the integrated valve group is connected to the corresponding suspension cylinder through a suspension control valve group;

[0014] The electromagnetic switch valve is used to control the on-off of each group of oil circuits;

[0015] The adjustable flow valve is used to adjust the operating speed of the suspension cylinder according to actual needs;

[0016] The pressure compensation valve is used to achieve post-valve compensation to ensure that the pressure difference before and after each adjustable throttle valve is equal; when the flow area of ​​each adjustable throttle valve is adjusted to be equal, the flow through each throttle valve is equal and does not change with the load, thereby ensuring the synchronous action of the suspension cylinder;

[0017] The three-way compensation valve is used to ensure that the system pressure is consistent with the actual load demand pressure, there is no additional pressure loss during speed regulation, and the system has low working energy consumption.

[0018] Furthermore, the suspension control valve group includes a three-position four-way valve of a neutral position function type 0, which is used to control the extension and retraction of the corresponding suspension cylinder by powering on and reversing the three-position four-way valve.

[0019] Furthermore, the hydraulic control system also includes a hydraulic oil tank, a pump, and a unloading valve group. The oil outlet of the hydraulic oil tank is connected to the oil inlet of the unloading valve group through the pump and the oil circuit, the oil outlet of the unloading valve group is connected to the oil inlet of the integrated valve group, the oil return channel of the integrated valve group is connected to the oil return port of the hydraulic oil tank through a three-way compensation valve, and the oil return port of the unloading valve group is connected to the oil return port of the hydraulic oil tank.

[0020] Furthermore, the hydraulic control system further comprises an oil return filter, and the oil return port of the hydraulic oil tank is also provided with an oil return filter for filtering the hydraulic oil returning to the hydraulic oil tank.

[0021] Furthermore, the pump is a gear pump.

[0022] Furthermore, the hydraulic oil tank is provided with a liquid level meter, a liquid level switch, a temperature sensor, and an air filter.

[0023] Furthermore, the unloading valve group includes an electrically controlled valve.

[0024] Beneficial effects: The hydraulic control system and integrated valve group for synchronous lifting of suspension cylinders provided by the present invention have the following advantages:

[0025] (1) It can realize the simultaneous lifting and lowering of suspension cylinders, the lifting and lowering of a single suspension cylinder, and the lifting and lowering of two suspension cylinders, so as to quickly adjust the vehicle to different postures and improve the vehicle's operational control performance;

[0026] (2) Ability to adjust the speed of the suspension cylinder;

[0027] (3) The hydraulic system has low energy consumption and ensures that the suspension cylinder can be raised and lowered smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of a hydraulic control system of an embodiment. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0031] Example 1

[0032] like Figure 1 As shown, an integrated valve group 5 includes a three-way compensation valve 5-0 and four groups of electromagnetic switch valves Y51, Y52, Y53, Y54, adjustable flow valves 5-1, 5-2, 5-3, 5-4, and pressure compensation valves 5-5, 5-6, 5-7, 5-8.

[0033] The oil inlet of the integrated valve group 5 is connected to the corresponding adjustable flow valve 5-1, 5-2, 5-3, 5-4 through the electromagnetic switch valve Y51, Y52, Y53, Y54 of each group, and a pressure compensation valve 5-5, 5-6, 5-7, 5-8 is installed behind each adjustable flow valve 5-1, 5-2, 5-3, 5-4;

[0034] A one-way valve is provided behind each set of pressure compensating valves 5-5, 5-6, 5-7, and 5-8, respectively, for obtaining a maximum load acting on the pressure compensating valve;

[0035] The non-spring chamber (left side) of the pressure compensating valve is connected to the outlet of the corresponding adjustable flow valve; the spring chambers (right side) of the four groups of pressure compensating valves are all connected to the spring chamber of the three-way compensating valve 5-0, and the non-spring chamber of the three-way compensating valve 5-0 is connected to the oil return channel of the integrated valve group 5; the oil inlet of the three-way compensating valve 5-0 is connected to the oil inlet of the integrated valve group through the oil return channel, and the oil outlet of the three-way compensating valve is connected to the oil return port of the integrated valve group.

[0036] Example 2

[0037] like Figure 1 As shown, a hydraulic control system includes the above-mentioned integrated valve group 5, four suspension control valve groups 2, 3, 7, 8, and four suspension cylinders 1, 4, 6, 9; the pressure compensation valve of each group of the integrated valve group 5 is connected to the corresponding suspension cylinder through a suspension control valve group;

[0038] In some embodiments, Figure 1 As shown, the pressure compensating valve 5-5 is connected to the suspension cylinder 1 through the suspension control valve group 2; the pressure compensating valve 5-6 is connected to the suspension cylinder 4 through the suspension control valve group 3; the pressure compensating valve 5-7 is connected to the suspension cylinder 6 through the suspension control valve group 7; the pressure compensating valve 5-8 is connected to the suspension cylinder 9 through the suspension control valve group 8;

[0039] In this embodiment, suspension cylinders 1, 4, 6, and 9 are respectively: suspension cylinder 1 is the right suspension cylinder of the front axle, suspension cylinder 4 is the left suspension cylinder of the front axle, suspension cylinder 6 is the left suspension cylinder of the rear axle, and suspension cylinder 9 is the right suspension cylinder of the rear axle.

[0040] Further, in some embodiments, Figure 1 As shown, the integrated valve group 5 includes:

[0041] Solenoid switch valves Y51, Y52, Y53, and Y54; used to control the on / off of each group of oil circuits;

[0042] Four adjustable flow valves 5-1, 5-2, 5-3, 5-4 are used to adjust the operating speed of the suspension cylinder according to actual needs;

[0043] Pressure compensation valves 5-5, 5-6, 5-7, and 5-8 are used to achieve post-valve compensation to ensure that the pressure difference before and after each adjustable throttle valve is equal; when the flow area of ​​each adjustable throttle valve is adjusted to be equal, the flow through each throttle valve is equal and does not change with the load, thereby ensuring the synchronous action of the suspension cylinder;

[0044] The three-way compensation valve 5-0 is used to ensure that the system pressure is consistent with the actual load demand pressure, there is no additional pressure loss during speed regulation, and the system has low operating energy consumption.

[0045] Further, in some embodiments, Figure 1 As shown, the suspension control valve groups 2, 3, 7, and 8 all contain a three-position four-way valve of a neutral function type 0, which is used to control the extension and retraction of the suspension cylinder by powering on and reversing the three-position four-way valve.

[0046] The hydraulic control system also includes a hydraulic oil tank 13, a pump 12, and a unloading valve group 11. The oil outlet of the hydraulic oil tank 13 is connected to the oil inlet of the unloading valve group 11 through the pump 12 and the oil circuit. The oil outlet of the unloading valve group 11 is connected to the oil inlet of the integrated valve group. The return oil channel of the integrated valve group is connected to the return oil port of the hydraulic oil tank 13 through a three-way compensation valve. The return oil port of the unloading valve group 11 is connected to the return oil port of the hydraulic oil tank 13.

[0047] Furthermore, the unloading valve group 11 includes an electric control valve Y0.

[0048] Furthermore, the hydraulic control system further includes an oil return filter 10 , and the oil return port of the hydraulic oil tank 13 is also provided with an oil return filter 10 for filtering the hydraulic oil returning into the hydraulic oil tank 13 .

[0049] In some embodiments, Figure 1 As shown, the hydraulic oil tank 13 is provided with a liquid level meter, a liquid level switch, a temperature sensor, and an air filter.

[0050] Example 3

[0051] like Figure 1 As shown, the hydraulic control system provided by the present invention has the following specific control principles:

[0052] When suspension adjustment is not required, the electric control valve Y0 in the unloading valve 11 is powered off by default, and the gear pump 12 is unloaded.

[0053] When four suspensions need to be lifted and lowered at the same time: the electric control valve Y0 in the unloading valve 11 is energized, the electromagnetic switch valves Y51, Y52, Y53, and Y54 in the integrated valve group 5 are energized, and the Y11, Y21, Y31, and Y41 in the control valve groups 2, 3, 7, and 8 are energized, and the suspension cylinders are lifted and lowered at the same time; the electric control valve Y0 in the unloading valve 11 is energized, the Y51, Y52, Y53, and Y54 in the integrated valve group are energized, and the Y12, Y22, Y32, and Y42 in the control valve groups 2, 3, 7, and 8 are energized, and the suspension cylinders are lifted and lowered at the same time.

[0054] When it is necessary to raise or lower the front axle or rear axle suspension at the same time: the electric control valve Y0 in the unloading valve 11 is energized, the electromagnetic switch valves Y51 and Y52 in the integrated valve group 5, and Y11 and Y21 in the control valve groups 2 and 3 are energized at the same time, or Y12 and Y22 are energized at the same time, so that the two suspensions of the front axle can be raised or lowered at the same time; the electric control valve Y0 in the unloading valve 11 is energized, Y53 and Y54 in the integrated valve group, and Y11 and Y21 in the control valve groups 7 and 8 are energized at the same time, or Y31 and Y41 are energized at the same time, or Y32 and Y42 are energized at the same time, so that the two suspensions of the rear axle can be raised or lowered at the same time.

[0055] When it is necessary to lift and lower the suspensions of different bridges on the same side at the same time: energize the electric control valve Y0 in the unloading valve 11, the solenoid switch valves Y51 and Y54 in the integrated valve group 5, and the Y11 and Y31 in the control valve groups 3 and 7 are energized at the same time, or Y12 and Y32 are energized at the same time, so that the two suspensions on the left can be lifted and lowered at the same time; energize the electric control valve Y0 in the unloading valve 11, Y52 and Y53 in the integrated valve group, and the Y21 and Y41 in the control valve groups 2 and 8 are energized at the same time, or Y22 and Y42 are energized at the same time, so that the two suspensions on the right can be lifted and lowered at the same time.

[0056] When a single suspension is required to be lifted or lowered: the electronically controlled valve Y0 in the unloading valve 11 is energized, the electromagnetic switch valve Y51 in the integrated valve group 5 is energized, and Y11 or Y12 in the control valve group 3 is energized, so that the left side suspension of the front axle can be lifted or lowered separately; the electronically controlled valve Y0 in the unloading valve 11 is energized, the electromagnetic switch valve Y52 in the integrated valve group 5 is energized, and Y21 or Y22 in the control valve group 2 is energized, so that the right side suspension of the front axle can be lifted or lowered separately; the electronically controlled valve Y0 in the unloading valve 11 is energized, the electromagnetic switch valve Y53 in the integrated valve group 5 is energized, and Y31 or Y32 in the control valve group 7 is energized, so that the left side suspension of the rear axle can be lifted or lowered separately; the electronically controlled valve Y0 in the unloading valve 11 is energized, the electromagnetic switch valve Y54 in the integrated valve group 5 is energized, and Y41 or Y42 in the control valve group 8 is energized, so that the right side suspension of the front axle can be lifted or lowered separately.

[0057] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection content of the present invention.

[0058] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A hydraulic control system, characterized in that: Includes integrated valve group, four suspension control valve groups and four suspension cylinders; The integrated valve group includes a three-way compensation valve and four groups of electromagnetic switch valves, adjustable flow valves and pressure compensation valves. The oil inlet of the integrated valve group is connected to the corresponding adjustable flow valve through each group of electromagnetic switch valves, and a pressure compensation valve is installed behind each adjustable flow valve; the non-spring chambers of the four groups of pressure compensation valves are connected to the outlets of the corresponding adjustable flow valves; the spring chambers of the four groups of pressure compensation valves are all connected to the spring chambers of the three-way compensation valves, and the non-spring chambers of the three-way compensation valves are connected to the return oil channel of the integrated valve group; a one-way valve is arranged behind each group of pressure compensation valves to obtain the maximum load and act on the pressure compensation valve; the oil inlet of the three-way compensation valve is connected to the oil inlet of the integrated valve group through the return oil channel, and the oil outlet of the three-way compensation valve is connected to the return oil port of the integrated valve group; The pressure compensation valve of each group of the integrated valve group is connected to the corresponding suspension cylinder through a suspension control valve group; the suspension control valve group includes a three-position four-way valve of the middle position function type 0, which is used to control the extension and retraction of the corresponding suspension cylinder through the power switching of the three-position four-way valve; The electromagnetic switch valve is used to control the on-off of each group of oil circuits; The adjustable flow valve is used to adjust the operating speed of the suspension cylinder according to actual needs; The pressure compensation valve is used to achieve post-valve compensation to ensure that the pressure difference before and after each adjustable flow valve is equal; when the flow area of ​​each adjustable flow valve is adjusted to be equal, the flow through each adjustable flow valve is equal and does not change with the load, thereby ensuring the synchronous action of the suspension cylinder; The three-way compensation valve is used to ensure that the system pressure is consistent with the actual load demand pressure.

2. The hydraulic control system according to claim 1, characterized in that: The hydraulic control system also includes a hydraulic oil tank, a pump, and a unloading valve group. The oil outlet of the hydraulic oil tank is connected to the oil inlet of the unloading valve group through the pump and the oil circuit. The oil outlet of the unloading valve group is connected to the oil inlet of the integrated valve group. The oil return channel of the integrated valve group is connected to the oil return port of the hydraulic oil tank through a three-way compensation valve. The oil return port of the unloading valve group is connected to the oil return port of the hydraulic oil tank.

3. The hydraulic control system according to claim 2, characterized in that: The unloading valve group includes an electrically controlled valve.

4. The hydraulic control system according to claim 2, characterized in that: The hydraulic control system further comprises an oil return filter. The oil return port of the hydraulic oil tank is also provided with an oil return filter for filtering the hydraulic oil returning to the hydraulic oil tank.

5. The hydraulic control system according to claim 2, characterized in that: The pump is a gear pump.

6. The hydraulic control system according to claim 2, characterized in that: The hydraulic oil tank is provided with a liquid level meter, a liquid level switch, a temperature sensor and an air filter.

Images