Hydraulic control system

Abstract

The utility model provides a hydraulic control system which comprises a working oil inlet and a working oil return port, at least one pair of executive components and control valve banks are arranged between the working oil inlet and the working oil return port, the number of the control valve banks is the same as the number of pairs of the executive components, and the control valve banks are correspondingly provided with oil inlet control ports. Each pair of execution elements is communicated with the corresponding control valve set and achieves start-stop interchange by controlling opening and closing of the oil inlet control port of the corresponding control valve set. According to the utility model, each pair of execution elements can realize start-stop interchange by controlling the opening and closing of the oil inlet control ports of the corresponding control valve groups, so that one group of working oil inlet and working oil return port can simultaneously drive at least one pair of execution elements; by arranging the integrated control valve group, system pipeline arrangement can be more compact, the occupied space and implementation cost of the system are greatly reduced, and the economical efficiency of the system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic systems, in particular to a hydraulic control system. Background Art

[0002] Hydraulic systems have the characteristics of high power density and easy pressure compensation, and are widely used in the drive operation systems of many large mechanical equipment. In a hydraulic system, one drive pump usually drives one actuator. If multiple pairs of actuators need to be controlled, complex external pipelines and external solenoid valves are required, or the same number of drive pumps as the actuators need to be configured.

[0003] For example, the closed hydraulic system has a higher power conversion efficiency than the open pump system and is used in more and more occasions. Usually, one closed pump corresponds to one motor in the closed pump system. If multiple pairs of motors need to be controlled, either the closed pumps with the same number of motors are directly matched to form multiple groups of one-to-one controlled closed pump drive systems, or complex external pipelines and external solenoid valves are required to achieve the control target, which will greatly increase the space occupied by the system and the product cost, and the economic efficiency of the system is poor. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a hydraulic control system to solve the problem that in the existing hydraulic system, if multiple pairs of actuators need to be driven, either a driving pump with the same number of actuators needs to be matched, or external complex pipelines and external solenoid valves are required to achieve the control target, which greatly increases the system's occupied space and product cost and has poor system economy.

[0005] In order to solve the above technical problems, the technical solution used in the utility model is:

[0006] A hydraulic control system described in the utility model comprises a working oil inlet and a working oil return port, at least one pair of actuators and a control valve group having the same number as the number of the actuators are arranged between the working oil inlet and the working oil return port, the control valve groups are each correspondingly provided with an oil inlet control port, each pair of actuators is respectively connected to the corresponding control valve group, and each pair of actuators realizes start-stop interchange by controlling the opening and closing of the oil inlet control port of the corresponding control valve group.

[0007] Preferably, the pair of actuators includes a first element and a second element, and the control valve group includes a first switch valve, a second switch valve, a third switch valve, a fourth switch valve and a switching valve;

[0008] The control port of the switching valve is communicated with the oil inlet control port of the control valve group, the oil inlet of the switching valve is communicated with the working oil inlet, the first oil outlet of the switching valve is communicated with the control ports of the first switching valve and the third switching valve respectively, and the second oil outlet of the switching valve is communicated with the control ports of the second switching valve and the fourth switching valve respectively;

[0009] The first switch valve is arranged on the oil circuit connecting the A end of the first element with the working oil inlet, the third switch valve is arranged on the oil circuit connecting the B end of the first element with the working oil return port, the second switch valve is arranged on the oil circuit connecting the A end of the second element with the working oil inlet, and the fourth switch valve is arranged on the oil circuit connecting the B end of the second element with the working oil return port.

[0010] Preferably, the working oil inlet and the working oil return port are working oil ports of a closed pump system, a shuttle valve is further provided between the working oil inlet and the working oil return port, and the oil outlet of the shuttle valve is connected to the oil inlet of the control valve group.

[0011] Further preferably, the first oil inlet of the shuttle valve is communicated with the working oil inlet, and a filter is provided on the oil supply line between the first oil inlet of the shuttle valve and the working oil inlet.

[0012] More preferably, a first one-way valve is further provided on the oil supply line between the first oil inlet of the shuttle valve and the working oil inlet, and the first one-way valve is provided in parallel with the filter.

[0013] More preferably, a second one-way valve is provided on the oil supply line between the filter and the at least one pair of actuators.

[0014] Preferably, the first switch valve, the second switch valve, the third switch valve, the fourth switch valve and the spring side ports of the switching valve are respectively connected to the oil tank.

[0015] Preferably, the switching valve is a two-position four-way hydraulically controlled switching valve; and / or the first element or the second element is a hydraulic motor.

[0016] Preferably, a diversion module is provided on the oil return line of the working oil return port, and the diversion module is used to communicate with the cooling circulation system.

[0017] Further preferably, the diversion module includes a three-way reversing valve and an adjustable damping connected to the three-way reversing valve, the oil inlet of the three-way reversing valve is connected to the return oil circuit, and the spring side port of the three-way reversing valve is connected between the adjustable damping and the cooling circulation system.

[0018] Compared with the prior art, the beneficial effects of the hydraulic control system described in the utility model are mainly reflected in:

[0019] The utility model is provided with at least one pair of actuators and a control valve group having the same number as the pair of actuators between the working oil inlet and the working oil return port, and the control valve groups are each provided with an oil inlet control port corresponding to the control valve group, and each pair of actuators can realize start-stop interchange by controlling the opening and closing of the oil inlet control port corresponding to the control valve group, thereby realizing that a group of working oil inlet and working oil return ports can simultaneously drive at least one pair of actuators;

[0020] The utility model can make the system pipeline layout more compact by arranging the integrated control valve group, greatly reduce the space occupied by the system and the implementation cost, and improve the economy of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other purposes, features and advantages of the present invention will become more apparent through a more specific description of the preferred embodiments of the present invention shown in the accompanying drawings. The same reference numerals in all the accompanying drawings indicate the same parts, and the drawings are not intentionally scaled to the actual size, but the focus is on illustrating the subject matter of the present invention.

[0022] Figure 1 A schematic diagram of the structure of a hydraulic control system provided by an embodiment of the utility model;

[0023] Description of the drawings: closed pump system 100, cooling circulation system 200, first element 1, second element 2, first switch valve 3, second switch valve 4, third switch valve 5, fourth switch valve 6, switching valve 7, shuttle valve 8, filter 9, first check valve 10, second check valve 11, three-way reversing valve 12, adjustable damping 13. DETAILED DESCRIPTION

[0024] The technical scheme of the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the utility model and implement it, but the examples given are not intended to limit the utility model. In the present embodiments, it should be understood that the orientations or positional relationships indicated by terms such as "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", and "outside" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the utility model, rather than indicating or implying 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 of the utility model.

[0025] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element and integrated therewith, or there may be an intermediate element at the same time. The terms "installed", "one end", "the other end" and similar expressions used in this utility model are for illustrative purposes only.

[0026] The present embodiment provides a hydraulic control system, including a working oil inlet A and a working oil return port B, wherein at least one pair of actuators and a control valve group having the same number of pairs as the actuators are arranged between the working oil inlet A and the working oil return port B, and each control valve group is correspondingly provided with an oil inlet control port X1, and each pair of actuators is respectively connected to the corresponding control valve group, and each pair of actuators realizes start-stop interchange by controlling the opening and closing of the oil inlet control port of the corresponding control valve group.

[0027] The utility model is provided with at least one pair of actuators and a control valve group having the same number of pairs as the actuators between the working oil inlet A and the working oil return port B. The control valve groups are each provided with an oil inlet control port X1 correspondingly. Each pair of actuators can realize the start-stop interchange by controlling the opening and closing of the oil inlet control port of the corresponding control valve group, thereby realizing that a group of working oil inlet A and working oil return port B can drive at least one pair of actuators at the same time.

[0028] The utility model can make the system pipeline layout more compact by arranging an integrated control valve group, greatly reduce the space occupied by the system and the implementation cost, and improve the economy of the system.

[0029] As an example, Figure 1 As shown, a pair of actuators includes a first element 1 and a second element 2, and a control valve group includes a first switch valve 3, a second switch valve 4, a third switch valve 5, a fourth switch valve 6 and a switching valve 7;

[0030] The control port ⑤ of the switching valve 7 is communicated with the oil inlet control port X1 of the control valve group, the oil inlet port ③ of the switching valve 7 is communicated with the working oil inlet port A, the first oil outlet port ② of the switching valve 7 is communicated with the control port ③ of the first switch valve 3 and the control port ③ of the third switch valve 5 respectively, and the second oil outlet port ④ of the switching valve 7 is communicated with the control port ③ of the second switch valve 4 and the control port ③ of the fourth switch valve 6 respectively;

[0031] The first switch valve 3 is arranged on the oil circuit connecting the A end of the first element 1 with the working oil inlet A, the third switch valve 5 is arranged on the oil circuit connecting the B end of the first element 1 with the working oil return port B, the second switch valve 4 is arranged on the oil circuit connecting the A end of the second element 2 with the working oil inlet A, and the fourth switch valve 6 is arranged on the oil circuit connecting the B end of the second element 2 with the working oil return port B.

[0032] When the oil inlet control port X1 does not flow with hydraulic oil, the switching valve 7 will maintain its initial position, and the hydraulic oil from the working oil inlet port A will flow from the oil inlet port ③ of the switching valve 7 to its first oil outlet port ②, and then to the control port ③ of the first switch valve 3 and the control port ③ of the third switch valve 5. After the hydraulic oil overcomes the opening pressure of the first switch valve 3 and the third switch valve 5, the first switch valve 3 and the third switch valve 5 will be opened, and then the hydraulic oil from the working oil inlet port A will flow through the first switch valve 3, the first element 1, the third switch valve 5 and the working oil return port B in sequence, so that the first element 1 is started, while the second element 2 is in a closed state;

[0033] When the hydraulic oil flows through the oil inlet control port X1, the hydraulic oil will flow to the control port ⑤ of the switching valve 7, so that the second oil outlet ④ of the switching valve 7 is turned on, and the hydraulic oil from the working oil inlet port A will flow from the oil inlet port ③ of the switching valve 7 to its second oil outlet ④, and to the control port ③ of the second switch valve 4 and the control port ③ of the fourth switch valve 6. After overcoming the opening pressure of the second switch valve 4 and the fourth switch valve 6, the hydraulic oil will open the second switch valve 4 and the fourth switch valve 6, and then the hydraulic oil from the working oil inlet port A will flow through the second switch valve 4, the second element 2, the fourth switch valve 6 and the working oil return port B in sequence, so that the second element 2 is started, while the first element 1 is in a closed state;

[0034] By controlling the on / off state of the oil inlet control port X1, the first element 1 or the second element 2 can be started separately, thereby achieving the purpose of a group of working oil inlet ports A and working oil outlet ports B simultaneously controlling a pair of actuators, and the first element 1 and the second element 2 can be interlocked. Specifically, the switching valve 7 is a two-position four-way hydraulically controlled switching valve 7.

[0035] It is understandable that if the number of pairs of actuators needs to be increased, the same number of control valve groups and oil inlet control ports can be added accordingly, and different control valve groups are in parallel. Based on this embodiment, if a pair of actuators is added, it is only necessary to add a switching valve 7, an oil inlet control port and two pairs of switch valves between the working oil inlet port A and the working oil outlet port B. The connection relationship of the added switching valve 7, an oil inlet control port and two pairs of switch valves is the same as described above. If two pairs of actuators need to be added, the corresponding addition process can be continued as above.

[0036] Preferably, the spring side ports of the first switch valve 3, the second switch valve 4, the third switch valve 5, the fourth switch valve 6 and the switching valve 7 are respectively connected to the system oil tank to deal with the valve core leakage problem, avoid the spring efficiency reduction or even failure caused by the leaked hydraulic oil, and improve the reliability of the system. Specifically, in this embodiment, the return oil port DR1 is used to communicate with the oil tank, the spring side ports ④ of the first switch valve 3, the second switch valve 4, the third switch valve 5 and the fourth switch valve 6 and the spring side port ⑥ of the switching valve 7 are all connected to the return oil port DR1, and the first element 1 and the second element 2 can be specifically hydraulic motors.

[0037] In view of the current control method of driving multiple groups of hydraulic actuators by a high-power closed pump system, in a preferred implementation, the working oil inlet A and the working oil return port B are the working oil ports of the closed pump system 100, and a shuttle valve 8 is further provided between the working oil inlet A and the working oil return port B, and the oil outlet ② of the shuttle valve 8 is connected to the oil inlet of the control valve group ( Figure 1 As shown, the oil inlet ③ of the switching valve 7 is connected, and when the pump in the closed pump system 100 is reversed, the hydraulic oil can flow from the working oil return port B to the working oil inlet A. Figure 1 In the illustrated embodiment, the first oil inlet port ③ of the shuttle valve 8 is communicated with the working oil inlet port A, and the second oil inlet port ① of the shuttle valve 8 is communicated with the working oil return port B.

[0038] Furthermore, a filter 9 is provided on the oil supply line between the first oil inlet ③ of the shuttle valve 8 and the working oil inlet A, for filtering the hydraulic oil flowing through the oil supply line, protecting the components of the oil line, and improving the reliability of the hydraulic system.

[0039] A first one-way valve 10 is also provided on the oil supply line between the first oil inlet ③ of the shuttle valve 8 and the working oil inlet A. The first one-way valve 10 is arranged in parallel with the filter 9, so that a bypass oil line can be set for the filter 9 to prevent the system from being blocked and paralyzed after the filter 9 is blocked.

[0040] A second one-way valve 11 is provided on the oil supply line between the filter 9 and at least one pair of actuators to prevent the actuators from reversing due to load force in unexpected situations, causing the pressure oil to flow back to the closed pump and damage the pump body.

[0041] In order to deal with the heat dissipation problem of the closed pump system 100, in a preferred embodiment, a shunt module is provided on the return oil circuit of the working return oil port B, and the shunt module is used to communicate with the cooling circulation system 200. By connecting the hydraulic oil circuit with the cooling circulation system 200, the problem of hydraulic oil temperature rise in the closed pump system 100 can be solved, and the integration of the hydraulic system can be improved, and the compactness and economy of the layout of the hydraulic system can be further improved. In a specific embodiment, the shunt module includes a three-way reversing valve 12 and an adjustable damping 13 connected to the three-way reversing valve 12, the oil inlet ① of the three-way reversing valve 12 is connected to the return oil circuit, and the spring side port ③ of the three-way reversing valve 12 is connected between the adjustable damping 13 and the cooling circulation system 200, so that the flow of the three-way reversing valve 12 can be kept stable, the amount of cooling oil can be kept stable, and then the stability of the hydraulic oil pressure in the hydraulic system and the reliable operation of the system can be ensured while cooling the hydraulic oil.

[0042] It should be noted that Figure 1 Marks TP1, TP2, ... are all pressure measuring ports of the corresponding oil circuits, which are used to monitor the hydraulic oil pressure of the corresponding oil circuits.

[0043] In this specification, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] In the description of this specification, the description with reference to the terms "preferred embodiment", "further embodiment", "other embodiments" or "specific example" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0045] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A hydraulic control system, characterized in that: It includes a working oil inlet and a working oil return port, between which at least one pair of actuators and a control valve group with the same number as the actuators are arranged, and the control valve groups are each correspondingly provided with an oil inlet control port, and each pair of actuators is respectively connected to the corresponding control valve group, and each pair of actuators realizes start-stop interchange by controlling the opening and closing of the oil inlet control port of the corresponding control valve group.

2. A hydraulic control system according to claim 1, characterized in that: The pair of actuators includes a first element and a second element, and the control valve group includes a first switch valve, a second switch valve, a third switch valve, a fourth switch valve and a switching valve; The control port of the switching valve is communicated with the oil inlet control port of the control valve group, the oil inlet of the switching valve is communicated with the working oil inlet, the first oil outlet of the switching valve is communicated with the control ports of the first switching valve and the third switching valve respectively, and the second oil outlet of the switching valve is communicated with the control ports of the second switching valve and the fourth switching valve respectively; The first switch valve is arranged on the oil circuit connecting the A end of the first element with the working oil inlet, the third switch valve is arranged on the oil circuit connecting the B end of the first element with the working oil return port, the second switch valve is arranged on the oil circuit connecting the A end of the second element with the working oil inlet, and the fourth switch valve is arranged on the oil circuit connecting the B end of the second element with the working oil return port.

3. A hydraulic control system according to claim 1, characterized in that: The working oil inlet and the working oil return port are working oil ports of a closed pump system. A shuttle valve is also provided between the working oil inlet and the working oil return port, and the oil outlet of the shuttle valve is connected to the oil inlet of the control valve group.

4. A hydraulic control system according to claim 3, characterized in that: The first oil inlet of the shuttle valve is communicated with the working oil inlet, and a filter is arranged on the oil supply line between the first oil inlet of the shuttle valve and the working oil inlet.

5. A hydraulic control system according to claim 4, characterized in that: A first one-way valve is also arranged on the oil supply line between the first oil inlet of the shuttle valve and the working oil inlet, and the first one-way valve is arranged in parallel with the filter.

6. A hydraulic control system according to claim 4, characterized in that: A second one-way valve is arranged on the oil supply line between the filter and the at least one pair of actuators.

7. A hydraulic control system according to claim 2, characterized in that: The first switch valve, the second switch valve, the third switch valve, the fourth switch valve and the spring side ports of the switching valve are respectively connected to the oil tank.

8. A hydraulic control system according to claim 2, characterized in that: The switching valve is a two-position four-way hydraulically controlled switching valve; and / or, the first element or the second element is a hydraulic motor.

9. A hydraulic control system according to any one of claims 1 to 8, characterized in that: A flow diversion module is arranged on the oil return path of the working oil return port, and the flow diversion module is used to communicate with the cooling circulation system.

10. A hydraulic control system according to claim 9, characterized in that: The diversion module includes a three-way reversing valve and an adjustable damper connected to the three-way reversing valve, the oil inlet of the three-way reversing valve is connected to the return oil circuit, and the spring side port of the three-way reversing valve is connected between the adjustable damper and the cooling circulation system.

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