Emergency valve, hydraulic system and engineering machinery

Abstract

The invention discloses an emergency valve, a hydraulic system and engineering machinery. An oil port 1 of a main overflow valve is connected with an oil port P, and an oil port 2 of the main overflow valve is connected with an oil port T; the oil port P is connected with the oil port C, the oil port 1 of the sequence valve is connected to an oil way between the oil port P and the oil port C, the oil port 2 is connected with the oil port D, and the oil port 3 is connected with the oil port T; an oil port 2 of the pressure buildup switch is connected with an oil port P and an oil inlet of the hand-operated direction valve, and an oil port 1 of the pressure buildup switch is connected with an oil port T; an oil outlet of the manual reversing valve is respectively connected with the oil port A and the oil port B; an oil port 1 of the pressure reducing valve is connected with an oil port X, an oil port 2 of the pressure reducing valve is connected with an oil port 2 of the shuttle valve, an oil port 3 of the pressure reducing valve is connected with an oil port T, the oil port 1 of the shuttle valve is connected to an oil way between an oil outlet of the hand-operated direction valve and an oil port A, and the oil port 3 of the shuttle valve is connected to an oil way between the oil outlet of the hand-operated direction valve and an oil port B; according to the invention, after an upper vehicle power system fails, the crane can realize full-action emergency and emergency collection.

Description

Technical Field

[0001] The invention relates to an emergency valve, a hydraulic system and engineering machinery, belonging to the technical field of engineering machinery. Background Art

[0002] During operation, a twin-engine crane may face problems such as failure of the upper engine and power transmission mechanism, resulting in shutdown failure, and the crane needs to be urgently retracted for maintenance; the retracting process mainly includes winch lowering, arm retraction, luffing, rotation and other actions; therefore, when the crane upper engine fails, it is necessary to provide emergency power and control for the upper hydraulic system, and the system that realizes the emergency retracting function mainly includes the main lifting system, auxiliary lifting system, telescopic system, luffing system, slewing system, auxiliary system and pilot device; At present, in actual application, there are two methods for controlling emergency power systems: motor pump and power trolley. The motor pump emergency power system uses a low-voltage DC motor to directly drive the hydraulic oil pump, and uses a vehicle-mounted battery as the power source. Due to its light weight, compact structure, and use of a vehicle-mounted battery as the power source, it is widely used in emergency boom lifting of aerial platforms or small-tonnage cranes. However, due to its low power, short continuous working time, and limited battery capacity, it cannot meet the needs of emergency boom lifting and emergency lowering of large-tonnage cranes (high power, long continuous working time, etc.). The power trolley is large in size and heavy in weight, making it difficult to start and inconvenient to carry, and it is also unable to achieve emergency lowering of the winch.

[0003] In the current practical application process, patent CN110642165B provides a boom hydraulic system, control method and emergency method of a working vehicle, which mainly include: a boom, a telescopic cylinder, a boom cylinder, a first emergency valve, a second emergency valve and a motorized reversing valve; the first emergency valve is connected to the rodless chamber of the telescopic cylinder; the second emergency valve is connected to the rodless chamber of the boom cylinder; the motorized reversing valve is respectively connected to the telescopic cylinder, the first emergency valve and the second emergency valve, and the telescopic cylinder controls the reversing of the motorized reversing valve.

[0004] The emergency system currently used by Liebherr is mainly composed of an emergency power unit and an emergency valve. The emergency unit is powered by a motor-pump group power unit, and the emergency valve switches the emergency action; the emergency valve is composed of a main overflow valve and a pressure reducing valve, which provide power sources for the main action and cylinder arm pin emergency respectively.

[0005] When the power of the vehicle fails, emergency control methods include external motor pump or power trolley; 1. The solution described in patent CN110642165B can only realize the emergency action and control of the boom, telescopic cylinder, and luffing cylinder, but cannot realize the emergency action of the whole vehicle. In addition, the addition of two emergency valves requires more connecting pipelines, and the valve group and pipelines are complicated.

[0006] 2. Liebherr's existing emergency valve can only realize the emergency of the cylinder arm pin and the main action, without pilot oil supply, and cannot realize the emergency of the whole vehicle action; 3. The motor pump emergency power system uses a low-voltage DC motor to directly drive the hydraulic oil pump, and uses the vehicle battery as the power source. However, due to its small weight, compact structure, and the vehicle battery as the power source, it is widely used in the emergency arm lifting of climbing platforms or small-tonnage cranes. However, due to its low power, short continuous working time, and limited battery capacity, it cannot meet the needs of emergency arm lifting and emergency lowering of winches for large-tonnage cranes (high power and long continuous working time). Summary of the invention

[0007] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an emergency valve, a hydraulic system and an engineering machine, so that after the upper vehicle power system fails, the crane can realize full action emergency and emergency retraction; In order to achieve the above purpose / solve the above technical problems, the present invention is implemented by adopting the following technical solutions: A first aspect: An emergency valve, comprising a valve body oil port P for connecting to an oil outlet of an oil pump for getting off a vehicle, an oil port T for connecting to an oil return tank, oil ports A and B for providing emergency power to an emergency pipeline, an oil port X for providing a pilot pressure to an on-vehicle, an oil port C for providing emergency power for auxiliary actions and superlifting of the on-vehicle, and an oil port D for providing power for telescopic and luffing actions of the on-vehicle; The oil port 1 of the main relief valve is connected to the oil port P, and the oil port 2 is connected to the oil port T; the oil port P is connected to the oil port C, the oil port 1 of the sequence valve is connected to the oil path between the oil port P and the oil port C, the oil port 2 of the sequence valve is connected to the oil port D, and the oil port 3 of the sequence valve is connected to the oil port T; The oil port 2 of the pressure-building switch is connected to the oil port P and the oil inlet of the manual reversing valve, and the oil port 1 of the pressure-building switch is connected to the oil port T; the oil outlet of the manual reversing valve is connected to the oil port A and the oil port B respectively; The oil port 1 of the pressure reducing valve is connected to the oil port X, the oil port 2 of the pressure reducing valve is connected to the oil port 2 of the shuttle valve, the oil port 3 of the pressure reducing valve is connected to the oil port T, the oil port 1 of the shuttle valve is connected to the oil circuit between the oil outlet of the manual reversing valve and the oil port A, and the oil port 3 of the shuttle valve is connected to the oil circuit between the oil outlet of the manual reversing valve and the oil port B.

[0008] Optionally, a throttle valve is provided between the oil port 1 and the oil port X of the pressure reducing valve, and a one-way valve is connected in parallel between the oil port X and the oil port 2 of the pressure reducing valve.

[0009] Optionally, a one-way valve is provided between the oil port T and the oil port 3 of the sequence valve.

[0010] Optionally, a one-way valve is provided at the oil inlet end of the oil port C, and a one-way valve is provided at the oil inlet end of the oil port D.

[0011] Optionally, the oil port P is connected to a pressure valve MP.

[0012] Optionally, when the pressure building switch is closed, the high-pressure oil flows back from the oil port P to the oil port T via the pressure building switch.

[0013] Optionally, when the pressure building switch is turned on, the manual reversing valve does not move, the oil port C is at high pressure, corresponding to the vehicle auxiliary action and super lifting to achieve emergency action, and the oil port D, under the adjustment of the sequence valve, corresponds to the vehicle telescopic and amplitude variable action to achieve emergency action.

[0014] Optionally, when the pressure building switch is turned on and the manual reversing valve is actuated, port A or port B is high pressure, one of which corresponds to the action of the actuator and the other is oil return. The shuttle valve's corresponding high pressure port A or port B provides pilot pressure for the upper vehicle corresponding to port X.

[0015] A second aspect: An emergency hydraulic system, wherein the emergency hydraulic system is equipped with the emergency valve described in the first aspect.

[0016] A third aspect: An engineering machinery comprising the emergency hydraulic system described in the second aspect.

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention is mainly composed of a relief valve, an emergency power switch, a manual reversing valve, a shuttle valve and two pressure reducing valves; the A and B ports of the emergency valve are connected to the reserved pipelines of the crane to provide emergency power for the main reel, auxiliary reel and tower reel of the vehicle; the X port is connected to the reserved pipeline of the crane to provide pilot pressure for the vehicle; the C port is connected to the reserved pipeline of the crane to provide emergency power for auxiliary actions and super lifting of the vehicle; the D port is connected to the reserved pipeline of the crane to provide power for telescopic and luffing actions of the vehicle, so as to solve and meet the problem that the crane can realize the emergency vehicle retracting function of the whole vehicle without adding an external power source, thereby reducing costs; The present invention provides an effective emergency control solution for the problem of emergency retraction of a twin-engine crane when the upper engine fails, without the need to separately set up an external power and control unit, thereby reducing the space and cost of the entire vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a hydraulic principle diagram of the emergency valve of the present invention. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, 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 limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0022] Embodiment 1, as Figure 1 As shown, an emergency valve is disclosed, including a valve body oil port P for connecting to the oil outlet of the oil pump for getting off the vehicle, an oil port T for connecting to the oil return tank, oil ports A and B for providing emergency power for the emergency pipeline, an oil port X for providing pilot pressure for the vehicle, an oil port C for providing emergency power for auxiliary actions and super-lifting of the vehicle, and an oil port D for providing power for telescopic and luffing actions of the vehicle; The oil port 1 of the main relief valve 13 is connected to the oil port P, and the oil port 2 is connected to the oil port T; the oil port P is connected to the oil port C, the oil port 1 of the sequence valve 18 is connected to the oil path between the oil port P and the oil port C, the oil port 2 of the sequence valve 18 is connected to the oil port D, and the oil port 3 of the sequence valve 18 is connected to the oil port T; The oil port 2 of the pressure-building switch 17 is connected to the oil port P and the oil inlet of the manual reversing valve 10, and the oil port 1 of the pressure-building switch 17 is connected to the oil port T; the oil outlet of the manual reversing valve 10 is connected to the oil port A and the oil port B respectively; The oil port 1 of the pressure reducing valve 16 is connected to the oil port X, the oil port 2 of the pressure reducing valve 16 is connected to the oil port 2 of the shuttle valve, the oil port 3 of the pressure reducing valve 16 is connected to the oil port T, the oil port 1 of the shuttle valve 20 is connected to the oil circuit between the oil outlet of the manual reversing valve 10 and the oil port A, and the oil port 3 of the shuttle valve 20 is connected to the oil circuit between the oil outlet of the manual reversing valve 10 and the oil port B.

[0023] The sequence valve 18 ensures that when oil is discharged from the C / D ports at the same time, there is (8MPa) in front of the sequence valve, that is, the C port outputs a pressure of at least 8MPa.

[0024] A throttle valve 14 is provided between the oil port 1 and the oil port X of the pressure reducing valve 16, and a check valve 15 is connected in parallel between the oil port X and the oil port 2 of the pressure reducing valve 16. Figure 1 As shown, the second port of the check valve 15 is connected to the oil port X, and is arranged in the oil path between the throttle valve 14 and the oil port X to prevent the oil port X from flowing back. A check valve 19 is arranged between the oil port T and the oil port 3 of the main relief valve 13 to prevent the oil from the T oil port from flowing back to the main relief valve 13.

[0025] A one-way valve 12.1 is provided at the oil inlet end of the oil port C, and a one-way valve 12.2 is provided at the oil inlet end of the oil port D to prevent the pressure outside the oil port C / oil port D from being reversed and damaging the emergency valve.

[0026] In the specific implementation of this embodiment, the oil port P is connected to a pressure valve MP for collecting the oil inlet pressure.

[0027] Working principle of emergency valve: When the pressure building switch is closed, high-pressure oil flows back from oil port P to oil port T through the pressure building switch.

[0028] When the pressure building switch is turned on, the manual reversing valve does not move, the oil port C is at high pressure, corresponding to the vehicle auxiliary action and super lifting to achieve emergency action, and the oil port D, under the adjustment of the sequence valve, corresponds to the vehicle telescopic and luffing actions to achieve emergency action.

[0029] When the pressure-building switch is turned on and the manual reversing valve is actuated, port A or port B is at high pressure, one of which corresponds to the action of the actuator and the other is for oil return. The shuttle valve's port A or port B corresponding to the high pressure provides pilot pressure for the upper vehicle corresponding to port X.

[0030] When the crane is in normal operation, the emergency power switch is closed and the emergency valve is in the unloading state; when the crane is retracting for emergency operation, the emergency power switch is turned on, the relief valve provides the main action pressure, and the pressure reducing valve provides the pilot and cylinder arm pin pressure, so as to perform emergency control of the whole machine action; During emergency action, the P port of the emergency valve is connected to the oil pump for getting off the vehicle of the twin-engine crane to provide power for getting on the vehicle. The pump group for getting off the vehicle is connected to the hydraulic oil tank for getting on the vehicle through a pipeline to provide the required hydraulic oil for emergency action, thereby enabling the twin-engine crane to complete the emergency action for getting on the vehicle without an external power source and hydraulic oil tank.

[0031] Embodiment 2: An emergency hydraulic system, wherein the emergency hydraulic system is equipped with the emergency valve described in Embodiment 1.

[0032] Embodiment 3: A construction machinery comprising the emergency hydraulic system described in Embodiment 2.

[0033] In summary, the present invention is mainly composed of a relief valve, an emergency power switch, a manual reversing valve, a shuttle valve and two pressure reducing valves. The A and B ports of the emergency valve are connected to the reserved pipelines of the crane to provide emergency power for the main reel, auxiliary reel and tower reel of the vehicle. The X port is connected to the reserved pipeline of the crane to provide pilot pressure for the vehicle. The C port is connected to the reserved pipeline of the crane to provide emergency power for auxiliary actions and super lifting of the vehicle. The D port is connected to the reserved pipeline of the crane to provide power for telescopic and luffing actions of the vehicle. The crane can realize the emergency vehicle retraction function of the whole vehicle without adding an external power source, thereby reducing costs. The present invention provides an effective emergency control solution for the problem of emergency retraction of a twin-engine crane when the upper engine fails, without the need to separately set up an external power and control unit, thereby reducing the space and cost of the entire vehicle.

[0034] 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. An emergency valve, characterized in that: It includes the valve body oil port P for connecting the oil outlet of the oil pump for getting off the vehicle, the oil port T for connecting the oil return tank, the oil ports A and B for providing emergency power for the emergency pipeline, the oil port X for providing pilot pressure for the vehicle, the oil port C for providing emergency power for the vehicle auxiliary action and super lifting, and the oil port D for providing power for the vehicle telescopic and luffing actions; The oil port 1 of the main relief valve is connected to the oil port P, and the oil port 2 is connected to the oil port T; the oil port P is connected to the oil port C, the oil port 1 of the sequence valve is connected to the oil path between the oil port P and the oil port C, the oil port 2 of the sequence valve is connected to the oil port D, and the oil port 3 of the sequence valve is connected to the oil port T; The oil port 2 of the pressure-building switch is connected to the oil port P and the oil inlet of the manual reversing valve, and the oil port 1 of the pressure-building switch is connected to the oil port T; the oil outlet of the manual reversing valve is connected to the oil port A and the oil port B respectively; The oil port 1 of the pressure reducing valve is connected to the oil port X, the oil port 2 of the pressure reducing valve is connected to the oil port 2 of the shuttle valve, the oil port 3 of the pressure reducing valve is connected to the oil port T, the oil port 1 of the shuttle valve is connected to the oil circuit between the oil outlet of the manual reversing valve and the oil port A, and the oil port 3 of the shuttle valve is connected to the oil circuit between the oil outlet of the manual reversing valve and the oil port B.

2. The emergency valve according to claim 1, characterized in that: A throttle valve is provided between the oil port 1 and the oil port X of the pressure reducing valve, and a one-way valve is connected in parallel between the oil port X and the oil port 2 of the pressure reducing valve.

3. The emergency valve according to claim 1, characterized in that: A one-way valve is provided between the oil port T and the oil port 3 of the sequence valve.

4. The emergency valve according to claim 1, characterized in that: The oil inlet end of the oil port C is provided with a one-way valve, and the oil inlet end of the oil port D is provided with a one-way valve.

5. The emergency valve according to claim 1, characterized in that: The oil port P is connected to a pressure valve MP.

6. The emergency valve according to claim 1, characterized in that: When the pressure build-up switch is closed, the high-pressure oil flows back from the oil port P to the oil port T through the pressure build-up switch.

7. The emergency valve according to claim 1, characterized in that: When the pressure building switch is turned on, the manual reversing valve does not move, the oil port C is at high pressure, corresponding to the vehicle auxiliary action and super lifting to achieve emergency action, and the oil port D, under the adjustment of the sequence valve, corresponds to the vehicle telescopic and luffing actions to achieve emergency action.

8. The emergency valve according to claim 1, characterized in that: When the pressure-building switch is turned on and the manual reversing valve is actuated, port A or port B is at high pressure, one of which corresponds to the action of the actuator and the other is for oil return. The shuttle valve's port A or port B corresponding to the high pressure provides pilot pressure for the upper vehicle corresponding to port X.

9. An emergency hydraulic system, characterized in that: The emergency hydraulic system is equipped with the emergency valve according to any one of claims 1-8.

10. An engineering machine, characterized in that: Includes the emergency hydraulic system as described in claim 9.

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