CN220706095U - Hydraulic system and high-altitude operation equipment - Google Patents
Hydraulic system and high-altitude operation equipment Download PDFInfo
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- CN220706095U CN220706095U CN202322476089.6U CN202322476089U CN220706095U CN 220706095 U CN220706095 U CN 220706095U CN 202322476089 U CN202322476089 U CN 202322476089U CN 220706095 U CN220706095 U CN 220706095U
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Abstract
The utility model relates to the technical field of hydraulic pressure, in particular to a hydraulic system and high-altitude operation equipment, wherein the hydraulic system comprises an oil supply assembly, a priority valve and at least one hydraulic control passage; the oil supply assembly comprises an oil tank and a pump body communicated with the oil tank; the priority valve is provided with a first oil inlet, a main oil outlet and a secondary oil outlet, and is suitable for switching between a first position and a second position, and the pump body, the first oil inlet and the secondary oil outlet are sequentially communicated with the oil tank to form a first loop; in the second position, the pump body, the first oil inlet, the main oil outlet and the hydraulic control passage are sequentially communicated with the oil tank to form a second loop. The hydraulic system is made to be a quantitative load sensitive system by adopting the priority valve, so that the problem of high energy consumption of a constant pressure system is avoided, the pressure fluctuation and the working jitter of the hydraulic system caused by using a conventional three-way flow valve in the process of switching the standby state and the working state of an executing mechanism are avoided, and the action response time of the hydraulic system is shortened.
Description
Technical Field
The utility model relates to the technical field of hydraulic pressure, in particular to a hydraulic system and high-altitude operation equipment.
Background
The aerial working equipment can walk while working when the aerial working platform is lifted to any position across obstacles, and is widely applicable to installation, maintenance and ascending operations of industries such as municipal administration, electric power, street lamps, advertisements, communication, photography, gardens, traffic, wharfs, airport ports, large industrial and mining enterprises and the like.
At present, most of high-altitude operation equipment with the length of 20 meters is provided with a platform fence valve group, and as the oil source of the platform fence valve group comes from a turntable, the connection length of an oil supply pipeline is more than 30 meters or longer, the action response time is longer due to a longer pipeline, the stability and the comfort are poor, a constant-pressure system can supply oil by adopting a variable pump, the oil supply flow loss of the variable pump is reduced, but the whole system is high-pressure when the turntable or the arm support works, the pressure waste cannot be solved, and the problem of high energy consumption of the system is caused.
Disclosure of Invention
The utility model provides a hydraulic system and high-altitude operation equipment, which are used for solving one of the defects in the prior art, avoiding high energy consumption of a constant pressure system, pressure fluctuation and working shake of the hydraulic system, shortening action response time of the hydraulic system and having higher micro-mobility, responsiveness and stability aiming at small flow.
The utility model provides a hydraulic system, which comprises an oil supply assembly, a priority valve and at least one hydraulic control passage; the oil supply assembly comprises an oil tank and a pump body communicated with the oil tank; the priority valve is provided with a first oil inlet, a main oil outlet and a secondary oil outlet, and is suitable for being switched between a first position and a second position, and in the first position, the pump body, the first oil inlet, the secondary oil outlet and the oil tank are sequentially communicated to form a first loop; and in the second position, the pump body, the first oil inlet, the main oil outlet, the hydraulic control passage and the oil tank are sequentially communicated to form a second loop.
According to the hydraulic system provided by the utility model, at least two hydraulic control passages are arranged, a plurality of hydraulic control passages are connected in parallel, each hydraulic control passage comprises a second oil inlet and an oil return port, each second oil inlet is communicated with the main oil outlet, and each oil return port is communicated with the oil tank.
According to the hydraulic system provided by the utility model, each hydraulic control passage comprises an oil cylinder and a valve assembly, the oil cylinder is communicated with the second oil inlet and the oil return opening through the valve assembly to form a first passage, the priority valve is provided with a control oil port, and the valve assembly is also communicated with the control oil port to form a second passage.
According to the hydraulic system provided by the utility model, the valve assembly comprises the bypass valve and the first control valve, the second oil inlet, the first control valve, the oil cylinder and the oil return port are sequentially communicated to form the first passage, the bypass valve is arranged on a pipeline for communicating the oil cylinder with the second oil inlet, and the oil outlets of the bypass valves are communicated with the control oil ports.
According to the hydraulic system provided by the utility model, the pipelines, through which the oil outlets of the bypass valves are communicated with the control oil outlet, are respectively provided with the one-way valve.
According to the hydraulic system provided by the utility model, the priority valve is arranged at the second position, and the secondary oil outlet is communicated with the oil tank.
According to the hydraulic system provided by the utility model, the first control valve comprises a proportional valve and a pressure compensation valve, the second oil inlet, the pressure compensation valve, the proportional valve, the oil cylinder and the oil return port are sequentially communicated to form the first passage, a branch pipeline is arranged on a pipeline for communicating an oil outlet of the bypass valve with the control oil port, and the pressure compensation valve is communicated with the branch pipeline; or, the first control valve comprises a reversing valve and a flow valve, and the second oil inlet, the flow valve, the reversing valve, the oil cylinder and the oil return port are sequentially communicated to form the first passage.
According to the hydraulic system provided by the utility model, the hydraulic control passage comprises the second control valve, the second control valve is suitable for being switched between a communicating position and a disconnecting position, in the communicating position, the pressure compensation valve, the proportional valve and the second control valve are sequentially communicated to form a third passage, the priority valve is switched to the first position, in the disconnecting position, the second control valve is communicated with the inlet and the outlet of the oil cylinder, and the priority valve is switched to the second position.
According to the hydraulic system provided by the utility model, the hydraulic system further comprises an overflow valve, and the pump body, the overflow valve and the oil tank are sequentially communicated to form a third loop.
The utility model also provides high-altitude operation equipment comprising the hydraulic system.
According to the hydraulic system provided by the utility model, the priority valve is additionally arranged between the oil supply assembly and the hydraulic control passage, the inlet of the pump body is communicated with the oil tank, and the outlet of the pump body is communicated with the first oil inlet of the priority valve, namely, the pump body provides power for the hydraulic oil in the oil tank to enter the hydraulic control passage. The main oil outlet of the priority valve is communicated with the oil tank through a hydraulic control passage, the secondary oil outlet of the priority valve is communicated with the oil tank, and the priority valve can be switched between a first position and a second position. When the hydraulic oil pump is in the first position, the first oil inlet of the priority valve is communicated with the secondary oil outlet to form a first loop, namely hydraulic oil in the first loop is pumped into the priority valve from the oil tank through the pump body and then directly flows back to the oil tank; when the hydraulic control device is in the second position, the first oil inlet of the priority valve is communicated with the main oil inlet to form a second loop, namely, hydraulic oil in the second loop directly flows into the hydraulic control passage after being pumped into the priority valve from the oil tank through the pump body, and then flows back to the oil tank.
When the priority valve is in the first position, the actuating mechanism controlled by the hydraulic control passage is in a standby state without action, and when the priority valve is in the second position, the actuating mechanism controlled by the hydraulic control passage is in a working state, so that the hydraulic system is changed into a load sensitive system from a constant pressure system through the switching application of the priority valve, when the actuating mechanism is in action, the priority valve ensures that the flow is preferentially supplied to the actuating mechanism as required, the pressure difference of the hydraulic control passage is equal to the set pressure difference of the priority valve, and when the actuating mechanism is not in action, the hydraulic oil conveyed by the pump body is unloaded back to the oil tank through the low pressure of the priority valve.
The hydraulic system is made to be a quantitative load sensitive system by adopting the priority valve, so that the high energy consumption problem of a constant pressure system is avoided, meanwhile, a three-way flow valve is not required to be used, the pressure fluctuation and the working shake of the hydraulic system caused by the conventional three-way flow valve in the process of switching the standby state and the working state of the actuating mechanism are avoided, and the action response time of the hydraulic system is shortened. The hydraulic system has strong applicability, can cope with the requirement of small-flow hydraulic oil within the actuating mechanism 3L when being applied to the operation of high-altitude operation equipment, and has higher micro-mobility, responsiveness and stability for small flow.
Drawings
In order to more clearly illustrate the utility model or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic illustration of a configuration of a priority valve of a hydraulic system according to the present utility model in a first position;
fig. 2 is a schematic view of a hydraulic system according to the present utility model in a second position.
Reference numerals:
100. an oil supply assembly; 110. an oil tank; 120. a pump body;
200. a priority valve; a. a first oil inlet; b. a main oil outlet; c. a secondary oil outlet; d. an oil port is controlled;
300. a hydraulic control passage; 310. an oil cylinder; 320. a bypass valve; 330. a one-way valve; 340. a first control valve; 341. a proportional valve; 342. a pressure compensating valve; 343. a reversing valve; 344. a flow valve; 350. a second control valve; e. a second oil inlet; f. an oil return port;
400. and an overflow valve.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1 and 2, the hydraulic system provided by the embodiment of the present utility model includes an oil supply unit 100, a priority valve 200, and at least one hydraulic control passage 300; the oil supply assembly 100 includes an oil tank 110 and a pump body 120 communicating with the oil tank 110; the priority valve 200 is provided with a first oil inlet a, a main oil outlet b and a secondary oil outlet c, and the priority valve 200 is suitable for switching between a first position and a second position, wherein in the first position, the pump body 120, the first oil inlet a and the secondary oil outlet c are sequentially communicated with the oil tank 110 to form a first loop; in the second position, the pump body 120, the first oil inlet a, the main oil outlet b, the hydraulic control passage 300 and the oil tank 110 are sequentially communicated to form a second loop.
In the hydraulic system of the embodiment of the utility model, the priority valve 200 is added between the oil supply assembly 100 and the hydraulic control passage 300, the inlet of the pump body 120 is communicated with the oil tank 110, and the outlet of the pump body 120 is communicated with the first oil inlet a of the priority valve 200, i.e. the pump body 120 provides power for the hydraulic oil in the oil tank 110 to enter the hydraulic control passage 300. The main oil outlet b of the priority valve 200 communicates with the tank 110 through the hydraulic control passage 300, the sub oil outlet c of the priority valve 200 communicates with the tank 110, and the priority valve 200 is switchable between a first position and a second position. In the first position, the first oil inlet a of the priority valve 200 is communicated with the secondary oil outlet c to form a first loop, namely hydraulic oil in the first loop is pumped into the priority valve 200 from the oil tank 110 through the pump body 120 and then directly flows back to the oil tank 110; in the second position, the first oil inlet a of the priority valve 200 is communicated with the main oil inlet to form a second loop, that is, hydraulic oil in the second loop flows into the hydraulic control passage 300 directly after being pumped into the priority valve 200 from the oil tank 110 through the pump body 120, and then flows back to the oil tank 110.
When the priority valve 200 is in the first position, the actuator controlled by the hydraulic control passage 300 is in a standby state without action, and when the priority valve 200 is in the second position, the actuator controlled by the hydraulic control passage 300 is in an operating state, so that the hydraulic system is changed into a load sensitive system from a constant pressure system through the switching application of the priority valve 200, when the actuator acts, the priority valve 200 ensures that the flow is preferentially supplied to the actuator as required, the differential pressure of the hydraulic control passage 300 is equal to the set differential pressure of the priority valve 200, and when the actuator does not act, the hydraulic oil conveyed by the pump body 120 is unloaded back to the oil tank 110 through the low pressure of the priority valve 200.
The adoption of the priority valve 200 enables the hydraulic system to be a quantitative load sensitive system, avoids the high energy consumption problem of a constant pressure system, simultaneously avoids the use of a three-way flow valve, avoids the pressure fluctuation and the working shake of the hydraulic system caused by the use of a conventional three-way flow valve in the process of switching the standby state and the working state of an actuating mechanism, and shortens the action response time of the hydraulic system. The hydraulic system has strong applicability, can cope with the requirement of small-flow hydraulic oil within the actuating mechanism 3L when being applied to the operation of high-altitude operation equipment, and has higher micro-mobility, responsiveness and stability for small flow.
In this embodiment, the first position is the right position of the priority valve 200, the main oil outlet b of the priority valve 200 is communicated with the oil tank 110 through the hydraulic control passage 300, but the passage of the first oil inlet a and the main oil outlet b is disconnected, and the second position is the left position of the priority valve 200, the secondary oil outlet c of the priority valve 200 is communicated with the oil tank 110, but the passage of the first oil inlet a and the secondary oil outlet c is disconnected.
In this embodiment, the priority valve 200 is a two-position three-way valve, and may be a static priority valve or a dynamic priority valve.
According to one embodiment of the present utility model, at least two hydraulic control passages 300 are provided, and a plurality of hydraulic control passages 300 are connected in parallel, wherein the hydraulic control passages 300 include second oil inlets e and oil return ports f, each of the second oil inlets e is communicated with the main oil outlet b, and each of the oil return ports f is communicated with the oil tank 110. In this embodiment, a plurality of hydraulic control passages 300 are connected in parallel behind the priority valve 200, and hydraulic oil can enter the plurality of hydraulic control passages 300 simultaneously or separately into the hydraulic control passages 300 which are required to control the actuation of the actuator after passing through the pump body 120 and the priority valve 200. The design of combining the priority valve 200 with the plurality of hydraulic control passages 300 can realize multi-action linkage and improve the working efficiency of the actuator.
In this embodiment, the second oil inlet e of each hydraulic control passage 300 is all connected to the main oil outlet pipeline, and the main oil outlet pipeline is sequentially provided with the pump body 120 and the priority valve 200 along the flow direction of hydraulic oil, the oil return port f of each hydraulic control passage 300 is all connected to the main oil return pipeline, and the main oil return pipeline is connected to the oil tank 110.
According to one embodiment of the present utility model, each hydraulic control passage 300 includes an oil cylinder 310 and a valve assembly, where the oil cylinder 310 communicates with the second oil inlet e and the oil return f to form a first passage through the valve assembly, and the priority valve 200 is provided with a control oil port d, and the valve assembly also communicates with the control oil port d to form a second passage. In this embodiment, the first passage is a passage through which hydraulic oil flows from the oil tank 110 into the oil cylinder 310 through the pump body 120, and then the hydraulic oil in the oil cylinder 310 is discharged out of the oil tank 110, so as to complete the operation of the oil cylinder 310. The second passage is a passage through which a part of the hydraulic oil flowing out through the valve assembly flows back to the control oil port d of the priority valve 200, and further, a signal for conveying the hydraulic oil to the oil cylinder 310 through the valve assembly is fed back to the priority valve 200, so that the priority valve 200 is controlled to switch from the first position to the second position, the timeliness of the oil supply reaction of the priority valve 200 and the continuous consistency of the supply of the hydraulic oil are ensured, or a signal for failing to convey the hydraulic oil to the oil cylinder 310 through the valve assembly is fed back to the priority valve 200, so that the priority valve 200 is controlled to switch from the second position to the first position, and the sensitivity of the priority valve 200 for cutting off the oil supply reaction is ensured.
One end of the first branch pipeline is communicated with the oil outlet main pipeline, the other end of the first branch pipeline is communicated with the oil cylinder 310, one end of the second branch pipeline is communicated with the oil cylinder 310, the other end of the second branch pipeline is communicated with the oil return main pipeline, the valve assembly is arranged on at least one of the first branch pipeline and the second branch pipeline, a first passage is formed, the on-off condition of the first branch pipeline and the second branch pipeline and the flow direction of hydraulic oil in the first branch pipeline and the second branch pipeline are changed through on-off control or displacement control of the valve assembly, and then the running state of the oil cylinder 310 is controlled, so that the action execution of the executing mechanism is controlled.
One end of the feedback line communicates with the valve assembly, and the other end communicates with the control port d of the priority valve 200, thereby forming a second passage, and the priority valve 200 is switched in state by a hydraulic oil signal of the second passage.
According to an embodiment of the present utility model, the valve assembly includes a bypass valve 320 and a first control valve 340, a second oil inlet e, the first control valve 340, an oil cylinder 310 and an oil return port f are sequentially communicated to form a first passage, the bypass valve 320 is disposed on a pipeline where the oil cylinder 310 is communicated with the second oil inlet e, and oil outlets of the bypass valves 320 are all communicated with the control oil port d. In this embodiment, the first branch pipeline is provided with a branch communication bypass valve 320, that is, after hydraulic oil sequentially passes through the pump body 120, the priority valve 200 and the first control valve 340, a part of hydraulic oil directly enters the oil cylinder 310 through the first branch pipeline, and another part of hydraulic oil enters the bypass valve 320 and returns to the control oil port d of the priority valve 200 through the feedback pipeline.
In this embodiment, the bypass valve 320 may be a shuttle valve, the first control valve 340 may be a four-way valve, the valve assembly may be a combination of the bypass valve 320 and the first control valve 340, and in other embodiments, the valve assembly may be a five-way valve, which also realizes the functions of the bypass valve 320 and the four-way valve.
In this embodiment, the bypass valve 320 adopts a shuttle valve, where one oil inlet of the shuttle valve is communicated with the first branch pipeline, and the other oil inlet of the shuttle valve is communicated with the second branch pipeline, so that when the first control valve 340 controls the flow direction of hydraulic oil in the first branch pipeline and the second branch pipeline to change, the hydraulic oil can be bypassed when any one of the first branch pipeline and the second branch pipeline is used as an oil inlet pipeline.
According to an embodiment of the present utility model, the pipelines for connecting the oil outlets of the bypass valves 320 with the control oil port d are respectively provided with a check valve 330. In this embodiment, the first branch lines of the plurality of hydraulic control paths 300 are connected in parallel to the main oil inlet line behind the priority valve 200, the feedback line includes a third branch line and a main feedback line, one end of the third branch line is connected to the bypass valve 320, the other end is connected to the main feedback line to form a second path, and each third branch line is connected in parallel to the main feedback line, so each hydraulic control path 300 includes the second path as a load feedback LS loop, and each third branch line is provided with a check valve 330 and is connected to the control port d of the priority valve 200 through the check valve 330 and the main feedback line.
In this embodiment, when the actuators are required to be simultaneously operated, the check valve 330 on the second passage with high hydraulic oil pressure, i.e., the second passage with high holding pressure, of the hydraulic control passages 300 corresponding to the operated actuators is opened, and the check valve 330 on the second passage with low pressure is closed. The priority valve 200 obtains a feedback signal to switch the priority valve 200 to the second position, the first oil inlet a is communicated with the main oil outlet b, and the main oil outlet b simultaneously outputs hydraulic oil to the hydraulic control passage 300 corresponding to the executing mechanism needing to simultaneously act through the main oil inlet pipeline. The check valve 330 is closed, so that the hydraulic oil circulation on the third branch pipeline can be influenced, the hydraulic oil series flow or the backflow caused by different pressures between the third branch pipelines can be avoided, the hydraulic oil flow in the second passage except the highest pressure can be reduced, and the disturbance of the hydraulic oil split on the first passage to the whole hydraulic control passage 300 can be reduced.
According to one embodiment provided by the present utility model, priority valve 200 is in the second position with secondary outlet c in communication with tank 110. In this embodiment, when the priority valve 200 is switched to the second position, the secondary oil outlet c is kept in communication with the oil tank 110, the priority valve 200 supplies oil from the main oil outlet b according to the flow requirement of the first control valve 340, and when the flow of hydraulic oil provided by the pump body 120 is greater than the flow required by the first control valve 340 after the priority valve 200, the redundant flow returns to the oil tank 110 from the secondary oil outlet c of the priority valve 200.
According to an embodiment of the present utility model, the first control valve 340 includes a proportional valve 341 and a pressure compensating valve 342, the second oil inlet e, the pressure compensating valve 342, the proportional valve 341, the oil cylinder 310 and the oil return port f are sequentially communicated to form a first passage, a branch pipeline is arranged on a pipeline for communicating the oil outlet of the bypass valve 320 with the control oil port d, and the pressure compensating valve 342 is communicated with the branch pipeline; or, the first control valve 340 includes a direction valve 343 and a flow valve 344, and the second oil inlet e, the flow valve 344, the direction valve 343, the oil cylinder 310 and the oil return port f are sequentially communicated to form a first passage.
In this embodiment, when the oil cylinder 310 is a platform rail oil cylinder 310 composed of a balance valve and a piston oil cylinder 310, the first control valve 340 may adopt a proportional valve 341 and a pressure compensating valve 342, hydraulic oil in the first passage sequentially passes through the pressure compensating valve 342, the proportional valve 341, the oil cylinder 310 and the proportional valve 341, and a branch pipeline is arranged on the third branch pipeline to communicate with the pressure compensating valve 342, so as to regulate and control the pressure of the hydraulic oil in the first passage. When the oil cylinder 310 is the swing oil cylinder 310, the first control valve 340 may employ a direction valve 343 and a flow valve 344, and the hydraulic oil in the first passage sequentially passes through the flow valve 344, the direction valve 343, the oil cylinder 310 and the direction valve 343. The priority valve 200 supplies oil from the main oil outlet b according to the flow requirements of the proportional valve 341 and the flow valve 344, and when the flow of the hydraulic oil provided by the pump body 120 is greater than the flow required by the first control valve 340 after the priority valve 200, the redundant flow is returned to the oil tank 110 from the secondary oil outlet c of the priority valve 200. The pressure difference between the front and rear sides of the proportional valve 341 or the reversing valve 343 is equal to the pressure difference set by the priority valve 200, and the oil delivered from the pump body 120 is unloaded back to the oil tank 110 by the priority valve 200 at a low pressure when the oil cylinder 310 is not operated.
In this embodiment, the proportional valve 341 may adopt a three-position four-way proportional reversing valve 343, the compensation valve is a two-position two-way valve, the flow valve 344 is a fixed flow valve 344, and the reversing valve 343 is a three-position four-way reversing valve 343. The first control valve 340 may adopt multiple control modes, and multiple control modes may be identical, or may adopt a combination of different control modes such as a proportional valve 341+a pressure compensator, a fixed flow valve 344, a proportional flow valve 344, and the like.
According to one embodiment of the present utility model, the hydraulic control passage 300 includes a second control valve 350, the second control valve 350 being adapted to switch between a communication position, in which the pressure compensating valve 342, the proportional valve 341 and the second control valve 350 are in turn communicated to form a third passage, the priority valve 200 being switched to the first position, and a disconnection position, in which the second control valve 350 communicates the inlet and the outlet of the cylinder 310, the priority valve 200 being switched to the second position.
In this embodiment, two oil ports of the oil cylinder 310 are respectively connected to the first branch pipeline and the second branch pipeline, and form corresponding inlets and outlets according to the flow directions of hydraulic oil in the first branch pipeline and the second branch pipeline. In the case of a first control valve 340 consisting of a proportional valve 341 and a pressure compensation valve 342, a second control valve 350 is arranged between the first branch line and the second branch line downstream of the bypass valve 320.
When the actuator is in an operating state and the oil cylinder 310 needs to act, the proportional valve 341 works in the left position or the right position, the second control valve 350 is switched from the on position to the off position, hydraulic oil sequentially passes through the pressure compensating valve 342, the proportional valve 341, the oil cylinder 310 and the proportional valve 341 and returns to the oil tank 110, hydraulic oil is bypassed to the priority valve 200 through the bypass valve 320, and after the priority valve 200 is switched from the first position to the second position, hydraulic oil sequentially passes through the pump body 120, the priority valve 200, the pressure compensating valve 342, the proportional valve 341, the oil cylinder 310 and the proportional valve 341 and returns to the oil tank 110.
When the actuator is in a standby state and the oil cylinder 310 does not need to act, the second control valve 350 is switched from the off position to the on position, hydraulic oil sequentially passes through the pump body 120, the priority valve 200, the pressure compensating valve 342, the proportional valve 341, the second control valve 350 and the proportional valve 341 and then returns to the oil tank 110, the hydraulic oil does not pass through the oil cylinder 310 any more, the hydraulic oil cannot bypass to the priority valve 200 through the bypass valve 320, the priority valve 200 is switched from the second position to the first position, and the hydraulic oil passes through the priority valve 200 and directly returns to the oil tank 110.
In this embodiment, the second control valve 350 may be a solenoid valve.
According to an embodiment of the present utility model, the hydraulic system further includes an overflow valve 400, and the pump body 120, the overflow valve 400, and the tank 110 are sequentially connected to form a third circuit. In this embodiment, an overflow valve 400 is disposed between the main oil inlet pipeline and the main oil return pipeline in front of the priority valve 200, and the overflow valve 400 sets the maximum working pressure of the hydraulic system to ensure the safety of the flow path pressure of the hydraulic system.
The aerial working device provided by the embodiment of the utility model is described below, and the aerial working device described below and the hydraulic system described above can be referred to correspondingly.
The embodiment of the utility model also provides high-altitude operation equipment, which comprises the hydraulic system.
The hydraulic system is applied to the overhead working equipment, can improve the action stability and response speed of the overhead working equipment, is beneficial to energy conservation and consumption reduction, and solves the problems of longer action response time and poor stability and comfort caused by longer oil supply pipeline in the prior art.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (10)
1. A hydraulic system comprising an oil supply assembly, a priority valve, and at least one hydraulic control passage; the oil supply assembly comprises an oil tank and a pump body communicated with the oil tank; the priority valve is provided with a first oil inlet, a main oil outlet and a secondary oil outlet, and is suitable for being switched between a first position and a second position, and in the first position, the pump body, the first oil inlet, the secondary oil outlet and the oil tank are sequentially communicated to form a first loop; and in the second position, the pump body, the first oil inlet, the main oil outlet, the hydraulic control passage and the oil tank are sequentially communicated to form a second loop.
2. The hydraulic system of claim 1, wherein the hydraulic control passages are at least two and a plurality of the hydraulic control passages are connected in parallel, the hydraulic control passages including a second oil inlet and an oil return port, each of the second oil inlets being in communication with the main oil outlet and each of the oil return ports being in communication with the oil tank.
3. The hydraulic system of claim 2, wherein each of the hydraulic control passages includes a cylinder and a valve assembly, the cylinder communicating with the second oil inlet and the oil return through the valve assembly to form a first passage, the priority valve being provided with a control port, the valve assembly also communicating with the control port to form a second passage.
4. The hydraulic system of claim 3, wherein the valve assembly comprises a bypass valve and a first control valve, the second oil inlet, the first control valve, the oil cylinder and the oil return port are sequentially communicated to form the first passage, the bypass valve is arranged on a pipeline for communicating the oil cylinder with the second oil inlet, and an oil outlet of each bypass valve is communicated with the control oil port.
5. The hydraulic system of claim 4, wherein the oil outlet of each bypass valve is provided with a check valve on a pipeline in communication with the control port.
6. The hydraulic system of claim 4, wherein the priority valve is in the second position and the secondary oil outlet is in communication with the tank.
7. The hydraulic system of claim 4, wherein the first control valve comprises a proportional valve and a pressure compensating valve, the second oil inlet, the pressure compensating valve, the proportional valve, the oil cylinder and the oil return port are sequentially communicated to form the first passage, a branch pipeline is arranged on a pipeline for communicating an oil outlet of the bypass valve with the control oil port, and the pressure compensating valve is communicated with the branch pipeline; or, the first control valve comprises a reversing valve and a flow valve, and the second oil inlet, the flow valve, the reversing valve, the oil cylinder and the oil return port are sequentially communicated to form the first passage.
8. The hydraulic system of claim 7, wherein the hydraulic control passage includes a second control valve adapted to switch between an on position, in which the pressure compensating valve, the proportional valve, and the second control valve are in communication in sequence to form a third passage, the priority valve switching to the first position, and an off position, in which the second control valve communicates the inlet and outlet of the ram, the priority valve switching to the second position.
9. The hydraulic system of any one of claims 1 to 8, further comprising an overflow valve, wherein the pump body, the overflow valve, and the tank are in communication in sequence to form a third circuit.
10. An aerial working device comprising a hydraulic system as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322476089.6U CN220706095U (en) | 2023-09-11 | 2023-09-11 | Hydraulic system and high-altitude operation equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322476089.6U CN220706095U (en) | 2023-09-11 | 2023-09-11 | Hydraulic system and high-altitude operation equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220706095U true CN220706095U (en) | 2024-04-02 |
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| CN202322476089.6U Active CN220706095U (en) | 2023-09-11 | 2023-09-11 | Hydraulic system and high-altitude operation equipment |
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