A multi-pump hydraulic interlocking control system and control method thereof and engineering machinery

Abstract

The present invention discloses a multi-pump hydraulic interlocking control system and a control method thereof and engineering machinery. The control system includes a hydraulic oil pump, a locking valve, a control valve and an actuator; the hydraulic oil pump, the locking valve, the control valve and the actuator are provided in multiple numbers, and form multiple groups of control units in a one-to-one correspondence; in each group of the control units, the hydraulic oil pump is connected to the locking valve, the locking valve is connected to the control valve, the control valve is connected to the actuator, and the rear end of the control valve is connected to the locking valve of other groups of control units, which is used to guide the high-pressure hydraulic oil after the control valve to the locking valve of other groups of control units to control the on and off of the locking valve. The present invention realizes the mutual locking of the actuator actions in the multi-pump hydraulic system through hydraulic interlocking, does not require electrical control, and can operate reliably in harsh electromagnetic environments or when the electrical system is damaged.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering machinery, and in particular relates to a multi-pump hydraulic interlocking control system and a control method thereof, and engineering machinery. Background Art

[0002] Hydraulic multifunctional rescue vehicles refer to rescue vehicles that transmit power through a hydraulic system and have multiple functions. When a hydraulic multifunctional rescue vehicle is performing rescue operations, when certain functions of the vehicle are in operation, it is necessary to ensure that other functions cannot be operated, otherwise it may cause rollover, mechanism collision or other dangerous situations. For example, when using the crane function, if the outriggers are extended and retracted, it may cause the vehicle to overturn. Therefore, it is necessary to add an interlocking mechanism to prevent multiple functions of the vehicle from being operated simultaneously due to misoperation to avoid danger.

[0003] Common interlocking mechanisms include hydraulic interlocking and electrical interlocking. Hydraulic interlocking generally switches the hydraulic power oil source to a certain function through a switching valve, so that the other function has no power oil source, thereby realizing the interlocking of the two sets of actions. Electrical interlocking controls the two sets of switch valves through electrical signals so that they cannot be energized at the same time, so that the two sets of switch valves cannot be opened at the same time, thereby realizing the interlocking of the two sets of actions. However, the existing hydraulic interlocking system can only be applied to single-pump hydraulic systems, and it is impossible to achieve hydraulic interlocking by switching the oil source of multi-pump hydraulic systems through switching valves. For multi-pump hydraulic systems, interlocking can only be achieved through electrical interlocking systems; and for electrical interlocking systems, the interlocking system cannot work properly in harsh electromagnetic environments or when the electrical system is damaged. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a multi-pump hydraulic interlocking control system, a control method thereof and engineering machinery, which can realize mutual locking of the actions of actuators in a multi-pump hydraulic system through hydraulic interlocking, without the need for electrical control, and can operate reliably in harsh electromagnetic environments or when the electrical system is damaged.

[0005] The present invention provides the following technical solutions:

[0006] In a first aspect, a multi-pump hydraulic interlock control system is provided, comprising a hydraulic oil pump, a locking valve, a control valve and an actuator;

[0007] The hydraulic oil pump, locking valve, control valve and actuator are provided in plurality, and form a plurality of control units in one-to-one correspondence;

[0008] In each group of the control units, the hydraulic oil pump is connected to the locking valve, the locking valve is connected to the control valve, the control valve is connected to the actuator, and the rear end of the control valve is connected to the locking valve of other groups of control units, which is used to lead the high-pressure hydraulic oil after the control valve to the locking valve of other groups of control units to control the on and off of the locking valve.

[0009] Furthermore, it also includes a hydraulic oil tank, and the hydraulic oil pump, the locking valve and the control valve are all connected to the hydraulic oil tank.

[0010] Furthermore, the locking valve is provided with a first oil inlet, a first oil outlet, a first control oil port and a leakage oil port;

[0011] In each group of control units, the hydraulic oil pump is connected to the first oil inlet, the first oil outlet is connected to the control valve, and the rear end of the control valve is connected to the first control oil port of the locking valve in other groups of control units, and the leakage oil port is connected to the hydraulic oil tank.

[0012] Furthermore, the locking valve includes a cartridge valve and a hydraulically controlled shut-off valve; the first oil inlet of the locking valve is connected to the first oil outlet through the cartridge valve, the cartridge valve is provided with a second control oil port, the second control oil port is connected to the leakage oil port of the locking valve through the hydraulically controlled shut-off valve; the hydraulically controlled shut-off valve is provided with a third control oil port, the third control oil port is connected to the leakage oil port of the locking valve through a throttle hole, and the first control oil port of the locking valve is connected between the third control oil port and the throttle hole.

[0013] Furthermore, the hydraulic oil pump is provided with a second oil inlet and a second oil outlet, the second oil inlet is connected to the hydraulic oil tank, the second oil outlet is connected to the first oil inlet of the locking valve, an overflow valve is also connected between the second oil outlet and the first oil inlet of the locking valve, and the overflow valve is connected to the hydraulic oil tank.

[0014] Furthermore, the control valve is provided with a third oil inlet, a plurality of working oil ports and an oil return port, the third oil inlet is connected to the first oil outlet of the locking valve, the working oil port is connected to the actuator, and the oil return port is connected to the hydraulic oil tank.

[0015] Furthermore, a shuttle valve is connected between the plurality of working oil ports of the control valve; in each group of the control units, the outlet of the shuttle valve is connected to the first control oil port of the locking valve in the control units of other groups.

[0016] Furthermore, in each group of the control units, the outlet of the shuttle valve is connected to the first control oil port of the locking valve in the control units of other groups through a one-way valve.

[0017] In a second aspect, a control method of the multi-pump hydraulic interlocking control system according to the first aspect is provided, comprising:

[0018] When the actuator in one group of control units is actuated, the high-pressure hydraulic oil behind the corresponding control valve is connected to the locking valve of other groups of control units, and the locking valves of other groups of control units are disconnected, so that the hydraulic oil pumps in other groups of control units cannot deliver hydraulic oil to the corresponding control valves, so as to control the corresponding actuator not to actuate, thereby realizing the action interlocking between the actuators.

[0019] In a third aspect, there is provided an engineering machinery comprising the multi-pump hydraulic interlocking control system described in the first aspect, or adopting the control method described in the second aspect.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention adds a locking valve between the hydraulic oil pump and the control valve, and the rear end of the control valve is connected to the locking valve of other groups of control units, which is used to guide the high-pressure hydraulic oil after the control valve to the locking valve of other groups of control units to control the on and off of the locking valve, thereby realizing the action interlocking between the actuators supplied by different hydraulic oil pumps in the multi-pump hydraulic system; the interlocking control circuit does not require electrical control, and the action interlocking of the actuators can be realized by hydraulic control alone, and it can still operate reliably in harsh electromagnetic environments or when the electrical system is damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a structural schematic diagram of a multi-pump hydraulic interlocking control system in an embodiment of the present invention;

[0023] Figure 2 is a schematic structural diagram of a locking valve in an embodiment of the present invention;

[0024] The markings in the figure are: 1, hydraulic oil tank; 21, first hydraulic oil pump; 22, second hydraulic oil pump; 23, third hydraulic oil pump; 31, first overflow valve; 32, second overflow valve; 33, third overflow valve; 41, first locking valve; 411, first cartridge valve; 412, first hydraulically controlled shut-off valve; 42, second locking valve; 421, second cartridge valve; 422, second hydraulically controlled shut-off valve; 43, third locking valve; 431, third cartridge valve Valve; 432, the third hydraulically controlled shut-off valve; 51, the first control valve; 52, the second control valve; 53, the third control valve; 61, the first one-way valve; 62, the second one-way valve; 63, the third one-way valve; 64, the fourth one-way valve; 65, the fifth one-way valve; 66, the sixth one-way valve; 71, the first shuttle valve; 72, the second shuttle valve; 73, the third shuttle valve; 81, the first actuator; 82, the second actuator unit; 83, the third actuator unit. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0026] Example 1

[0027] The present invention provides a multi-pump hydraulic interlocking control system, comprising a hydraulic oil tank, a hydraulic oil pump, a locking valve, a control valve and an actuator; the hydraulic oil pump, the locking valve and the control valve are all connected to the hydraulic oil tank, and the hydraulic oil pump, the locking valve, the control valve and the actuator are each provided in plurality, and form a plurality of control units in one-to-one correspondence; in each group of the control units, the hydraulic oil pump is connected to the locking valve, the locking valve is connected to the control valve, the control valve is connected to the actuator, and the rear end of the control valve is connected to the locking valve of other groups of control units, so as to guide the high-pressure hydraulic oil after the control valve to the locking valve of other groups of control units to control the on and off of the locking valve.

[0028] like Figure 1 and Figure 2 As shown, this embodiment is described by taking a three-pump hydraulic interlocking control system as an example, that is, three hydraulic oil pumps, locking valves, control valves and actuators are provided, and three groups of control units are formed in a one-to-one correspondence. Among them, the three hydraulic oil pumps are the first hydraulic oil pump 21, the second hydraulic oil pump 22 and the third hydraulic oil pump 23, the three locking valves are the first locking valve 41, the second locking valve 42 and the third locking valve 43, the three control valves are the first control valve 51, the second control valve 52 and the third control valve 53, and the three actuators are the first actuator 81, the second actuator 82 and the third actuator 83.

[0029] The first locking valve 41 is provided with a first oil inlet P1, a first oil outlet A1, a first control oil port X1 and a leakage oil port L, the second locking valve 42 is provided with a first oil inlet P2, a first oil outlet A2 and a first control oil port X2, the third locking valve 43 is provided with a first oil inlet P3, a first oil outlet A3 and a first control oil port X3, the second locking valve 42 and the third locking valve 43 are both provided with leakage oil ports and merge into the leakage oil port L, and the leakage oil port L is connected to the hydraulic oil tank 1.

[0030] The first locking valve 41 includes a first cartridge valve 411 and a first hydraulically controlled shut-off valve 412, the second locking valve 42 includes a second cartridge valve 421 and a second hydraulically controlled shut-off valve 422, and the third locking valve 43 includes a third cartridge valve 431 and a third hydraulically controlled shut-off valve 432. The first oil inlet P1 of the first locking valve 41 is connected to the first oil outlet A1 of the first locking valve 41 through the first cartridge valve 411, the first oil inlet P2 of the second locking valve 42 is connected to the first oil outlet A2 of the second locking valve 42 through the second cartridge valve 421, and the first oil inlet P3 of the third locking valve 43 is connected to the first oil outlet A3 of the third locking valve 43 through the third cartridge valve 431. The first cartridge valve 411, the second cartridge valve 421 and the third cartridge valve 431 are all provided with a second control oil port, and the second control oil ports of the first cartridge valve 411, the second cartridge valve 421 and the third cartridge valve 431 are respectively connected to the leakage oil port L through the first hydraulically controlled cut-off valve 412, the second hydraulically controlled cut-off valve 422 and the third hydraulically controlled cut-off valve 432. The first hydraulically controlled cut-off valve 412, the second hydraulically controlled cut-off valve 422 and the third hydraulically controlled cut-off valve 432 are all provided with a third control oil port, and the third control oil ports of the first hydraulically controlled cut-off valve 412, the second hydraulically controlled cut-off valve 422 and the third hydraulically controlled cut-off valve 432 are respectively connected to the leakage oil port L through a throttle hole. The first control oil port X1 of the first locking valve 41 is connected between the third control oil port and the throttle hole of the first hydraulically controlled shut-off valve 412, the first control oil port X2 of the second locking valve 42 is connected between the third control oil port and the throttle hole of the second hydraulically controlled shut-off valve 422, and the first control oil port X3 of the third locking valve 43 is connected between the third control oil port and the throttle hole of the third hydraulically controlled shut-off valve 432. The first hydraulically controlled shut-off valve 412, the second hydraulically controlled shut-off valve 422, and the third hydraulically controlled shut-off valve 432 are in a normally open state.

[0031] The first hydraulic oil pump 21, the second hydraulic oil pump 22 and the third hydraulic oil pump 23 are all provided with a second oil inlet and a second oil outlet, each second oil inlet is connected to the hydraulic oil tank 1, and the second oil outlets of the first hydraulic oil pump 21, the second hydraulic oil pump 22 and the third hydraulic oil pump 23 are respectively connected to the first oil inlet P1 of the first locking valve 41, the first oil inlet P2 of the second locking valve 42 and the first oil inlet P3 of the third locking valve 43. A first overflow valve 31 is connected between the second oil outlet of the first hydraulic oil pump 21 and the first oil inlet P1 of the first locking valve 41, a second overflow valve 32 is connected between the second oil outlet of the second hydraulic oil pump 22 and the first oil inlet P2 of the second locking valve 42, and a third overflow valve 33 is connected between the second oil outlet of the third hydraulic oil pump 23 and the first oil inlet P3 of the third locking valve 42, and each overflow valve is connected to the hydraulic oil tank 1.

[0032] The first control valve 51, the second control valve 52 and the third control valve 53 are all provided with a third oil inlet P, a working oil port A, a working oil port B and an oil return port T. The third oil inlet P of the first control valve 51, the second control valve 52 and the third control valve 53 are respectively connected to the first oil outlet A1 of the first locking valve 41, the first oil outlet A2 of the second locking valve 42 and the first oil outlet A3 of the third locking valve 43. The working oil port A and the working oil port B of the first control valve 51 are connected to the two oil ports of the first actuator 81, the working oil port A and the working oil port B of the second control valve 52 are connected to the two oil ports of the second actuator 82, and the working oil port A and the working oil port B of the third control valve 53 are connected to the two oil ports of the third actuator 83. The oil return port T of the first control valve 51, the second control valve 52 and the third control valve 53 is connected to the hydraulic oil tank 1.

[0033] The working oil ports A and B of the first control valve 51, the second control valve 52, and the third control valve 53 are connected together through the first shuttle valve 71, the second shuttle valve 72, and the third shuttle valve 73, respectively. In each group of control units, the outlet of the shuttle valve is connected to the first control oil port of the locking valve in other groups of control units through a one-way valve. Specifically, the outlet of the first shuttle valve 71 is connected to the first control oil port X3 of the third locking valve 43 and the first control oil port X2 of the second locking valve 42 through the first one-way valve 61 and the second one-way valve 62, respectively, the outlet of the second shuttle valve 72 is connected to the first control oil port X1 of the first locking valve 41 and the first control oil port X3 of the third locking valve 43 through the third one-way valve 63 and the fourth one-way valve 64, respectively, and the outlet of the third shuttle valve 73 is connected to the first control oil port X1 of the first locking valve 41 and the first control oil port X2 of the second locking valve 42 through the fifth one-way valve 65 and the sixth one-way valve 66, respectively.

[0034] In some other embodiments, the present invention is applicable to actuator action interlocking of a hydraulic control circuit with two pumps or more than three pumps.

[0035] In some other embodiments, the control valve can also be a control valve group, that is, the control circuit is also suitable for the action interlocking of two or more groups of actuators, such as the action interlocking of the slewing, telescopic, boom lengthening, lifting and outrigger horizontal cylinders and vertical cylinders of a truck crane.

[0036] In some other implementations, the actuator may also be a hydraulic motor or any other hydraulic actuator.

[0037] Example 2

[0038] like Figure 1 and Figure 2 As shown, this embodiment provides a control method for the multi-pump hydraulic interlocking control system described in Embodiment 1, which is specifically as follows:

[0039] When the first control valve 51, the second control valve 52 and the third control valve 53 are all in the middle position, that is, the first actuator 81, the second actuator 82 and the third actuator 83 are all inactive, the first control oil port X1 of the first locking valve 41, the first control oil port X2 of the second locking valve 42 and the first control oil port X3 of the third locking valve 43 are all free of high-pressure hydraulic oil, the second control oil ports of the first cartridge valve 411, the second cartridge valve 421 and the third cartridge valve 431 are connected to the hydraulic oil tank 1 through the leakage oil port L, and the first cartridge valve 411, the second cartridge valve 421 and the third cartridge valve 431 are all in a connected state.

[0040] When the first control valve 51 is in the left position or the right position, that is, the first actuator 81 is actuated, the first shuttle valve 71 guides the high-pressure hydraulic oil in the working oil port A or the working oil port B of the first control valve 51 to the first control oil port X2 of the second locking valve 42 and the first control oil port X3 of the third locking valve 43, and the second hydraulically controlled cut-off valve 422 and the third hydraulically controlled cut-off valve 432 are switched to the left position by the high-pressure hydraulic oil, and the second control oil ports of the second cartridge valve 421 and the third cartridge valve 431 are disconnected from the leakage oil port L of the locking valve, and the second cartridge valve 421 and the third cartridge valve 431 are cut off, the first oil inlet P2 of the second locking valve 42 is disconnected from the first oil outlet A2, the first oil inlet P3 of the third locking valve 43 is disconnected from the first oil outlet A3, and there is no high-pressure hydraulic oil in the third oil inlet P of the second control valve 52 and the third control valve 53. At this time, when the second control valve 52 and the third control valve 53 are operated, the second actuator 82 and the third actuator 83 will not act, thereby realizing the interlocking of the first actuator 81, the second actuator 82 and the third actuator 83.

[0041] When the second control valve 52 is in the left position or the right position, that is, the second actuator 82 is actuated, the second shuttle valve 72 guides the high-pressure hydraulic oil in the working oil port A or the working oil port B of the second control valve 52 to the first control oil port X1 of the first locking valve 41 and the first control oil port X3 of the third locking valve 43, and the first hydraulically controlled cut-off valve 412 and the third hydraulically controlled cut-off valve 432 are switched to the left position by the high-pressure hydraulic oil, and the second control oil ports of the first cartridge valve 411 and the third cartridge valve 431 are disconnected from the leakage oil port L of the locking valve, and the first cartridge valve 412 and the third cartridge valve 431 are disconnected from the leakage oil port L of the locking valve. The valve 411 and the third cartridge valve 431 are cut off, the first oil inlet P1 of the first locking valve 41 is disconnected from the first oil outlet A1, the first oil inlet P3 of the third locking valve 43 is disconnected from the first oil outlet A3, and there is no high-pressure hydraulic oil in the third oil inlet P of the first control valve 51 and the third control valve 53. At this time, when the first control valve 51 and the third control valve 53 are operated, the first actuator 81 and the third actuator 83 will not be actuated, thereby realizing the interlocking of the actions of the second actuator 82 and the first actuator 81 and the third actuator 83.

[0042] When the third control valve 53 is in the left position or the right position, that is, the third actuator 83 is actuated, the third shuttle valve 73 guides the high-pressure hydraulic oil in the working oil port A or the working oil port B of the third control valve 53 to the first control oil port X1 of the first locking valve 41 and the first control oil port X2 of the second locking valve 42, and the first hydraulically controlled cut-off valve 412 and the second hydraulically controlled cut-off valve 422 are switched to the left position by the high-pressure hydraulic oil, and the second control oil ports of the first cartridge valve 411 and the second cartridge valve 421 are disconnected from the leakage oil port L of the locking valve, and the first cartridge valve 412 and the second hydraulically controlled cut-off valve 422 are switched to the left position by the high-pressure hydraulic oil. The valve 411 and the second cartridge valve 421 are cut off, the first oil inlet P1 of the first locking valve 41 is disconnected from the first oil outlet A1, the first oil inlet P2 of the second locking valve 42 is disconnected from the first oil outlet A2, and there is no high-pressure hydraulic oil in the third oil inlet P of the first control valve 51 and the second control valve 52. At this time, when the first control valve 51 and the second control valve 52 are operated, the first actuator 81 and the second actuator 82 will not be actuated, thereby realizing the interlocking of the action of the third actuator 83 and the first actuator 81 and the second actuator 82.

[0043] Example 3

[0044] This embodiment provides an engineering machinery equipped with the multi-pump hydraulic interlocking control system described in Embodiment 1, or adopts the control method described in Embodiment 2.

[0045] In the description of the present invention, it is to be understood that the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0046] 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 technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A multi-pump hydraulic interlocking control system, characterized in that: Including hydraulic oil pump, locking valve, control valve and actuator; The hydraulic oil pump, locking valve, control valve and actuator are provided in plurality, and form a plurality of control units in one-to-one correspondence; In each group of the control units, the hydraulic oil pump is connected to the locking valve, the locking valve is connected to the control valve, the control valve is connected to the actuator, and the rear end of the control valve is connected to the locking valve of other groups of control units, so as to guide the high-pressure hydraulic oil after the control valve to the locking valve of other groups of control units to control the on and off of the locking valve; The locking valve is provided with a first oil inlet, a first oil outlet, a first control oil port and a leakage oil port; in each group of control units, the hydraulic oil pump is connected to the first oil inlet, the first oil outlet is connected to the control valve, and the rear end of the control valve is connected to the first control oil port of the locking valve in the other group of control units, and the leakage oil port is connected to the hydraulic oil tank; The locking valve includes a cartridge valve and a hydraulically controlled shut-off valve; the first oil inlet of the locking valve is connected to the first oil outlet through the cartridge valve, the cartridge valve is provided with a second control oil port, the second control oil port is connected to the leakage oil port of the locking valve through the hydraulically controlled shut-off valve; the hydraulically controlled shut-off valve is provided with a third control oil port, the third control oil port is connected to the leakage oil port of the locking valve through a throttle hole, and the first control oil port of the locking valve is connected between the third control oil port and the throttle hole.

2. The multi-pump hydraulic interlocking control system according to claim 1, characterized in that: It also includes a hydraulic oil tank, and the hydraulic oil pump, the locking valve and the control valve are all connected to the hydraulic oil tank.

3. The multi-pump hydraulic interlocking control system according to claim 1, characterized in that: The hydraulic oil pump is provided with a second oil inlet and a second oil outlet, the second oil inlet is connected to the hydraulic oil tank, the second oil outlet is connected to the first oil inlet of the locking valve, an overflow valve is also connected between the second oil outlet and the first oil inlet of the locking valve, and the overflow valve is connected to the hydraulic oil tank.

4. The multi-pump hydraulic interlocking control system according to claim 3, characterized in that: The control valve is provided with a third oil inlet, a plurality of working oil ports and an oil return port, the third oil inlet is connected to the first oil outlet of the locking valve, the working oil port is connected to the actuator, and the oil return port is connected to the hydraulic oil tank.

5. The multi-pump hydraulic interlocking control system according to claim 4, characterized in that: A shuttle valve is connected between the multiple working oil ports of the control valve; in each group of the control units, the outlet of the shuttle valve is connected to the first control oil port of the locking valve in the control units of other groups.

6. The multi-pump hydraulic interlocking control system according to claim 5, characterized in that: In each group of the control units, the outlet of the shuttle valve is connected to the first control oil port of the locking valve in the control units of other groups through a one-way valve.

7. A control method for a multi-pump hydraulic interlocking control system according to any one of claims 1 to 6, characterized in that: include: When the actuator in one group of control units is actuated, the high-pressure hydraulic oil behind the corresponding control valve is connected to the locking valve of other groups of control units, and the locking valves of other groups of control units are disconnected, so that the hydraulic oil pumps in other groups of control units cannot deliver hydraulic oil to the corresponding control valves, so as to control the corresponding actuator not to actuate, thereby realizing the action interlocking between the actuators.

8. An engineering machine, characterized in that: It comprises the multi-pump hydraulic interlocking control system as described in any one of claims 1 to 6, or adopts the control method as described in claim 7.

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