Hydraulic systems for drainage equipment

Abstract

The present invention provides a hydraulic system for drainage equipment, which relates to the technical field of hydraulic systems, and includes a hydraulic power unit, a travel motor, a water pump motor, a lifting cylinder, an external output interface, and a controller; wherein the hydraulic power unit includes a fuel tank, a hydraulic pump, and an engine; the output shaft of the engine is connected to the pump shaft of the hydraulic pump. The travel motor is used to drive the chassis of the drainage equipment to travel. The water pump motor is used to drive the water pump of the drainage equipment to work. The lifting cylinder is used to drive the water pump of the drainage equipment to lift and lower. The external output interface is used to connect to an external hydraulic pipeline and output oil to it. The travel motor, the water pump motor, the lifting cylinder, and the external output interface are all connected to the oil supply pipeline through a proportional valve. The controller is used to adjust the flow of each proportional valve in real time to keep the engine torque dynamically within a set range. The present application can avoid excessive torque causing the engine to slow down or even stall.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic systems, and in particular to a hydraulic system for drainage equipment. Background Art

[0002] At present, some hydraulic drainage equipment is driven by a chassis, and a water pump is arranged on the chassis. Both the water pump and the chassis are driven by hydraulic pressure. Specifically, the hydraulic system is used to drive the drainage equipment to move, turn, drain, and output externally.

[0003] In the hydraulic system of drainage equipment, the engine is the main power source. The engine drives the hydraulic pump to provide pressurized oil to the travel motor, water pump motor, lifting cylinder, etc. In some cases, when the drainage equipment travels and the water pump works at the same time or the water pump and multiple external outputs work at the same time, the engine will slow down or even stall due to excessive load. Summary of the invention

[0004] The technical problem to be solved by the present application is to propose a hydraulic system for drainage equipment in view of the above-mentioned deficiencies in the prior art.

[0005] A hydraulic system for drainage equipment, the hydraulic system comprising:

[0006] The hydraulic power unit comprises an oil tank, a hydraulic pump and an engine; the output shaft of the engine is dynamically connected to the pump shaft of the hydraulic pump; the hydraulic pump is used to absorb the oil in the oil tank and pressurize and output the pressure oil to the oil supply pipeline;

[0007] Travel motor, used to drive the chassis of the drainage equipment to travel;

[0008] Water pump motor, used to drive the water pump of drainage equipment;

[0009] A lifting cylinder is used to drive the water pump of the drainage equipment to move up and down;

[0010] An external output interface is used to connect to an external hydraulic pipeline and output oil to it;

[0011] The travel motor, the water pump motor, the lifting cylinder, and the external output interface are all connected to the oil supply pipeline through a proportional valve;

[0012] The controller is used to adjust the flow of each proportional valve in real time to keep the engine torque dynamic within the set range;

[0013] The pressure sensor is used to measure the working pressure of the hydraulic system; the controller calculates the engine torque in real time according to the flow of each proportional valve and the pressure measured by the pressure sensor; and compares the calculated engine torque with the torque threshold, and adjusts the flow of each proportional valve in real time according to the comparison result, so that the engine torque is dynamically maintained within the set range;

[0014] The control input component is capable of executing the following process: receiving priority sorting information input from the control input component, and prioritizing each proportional valve according to the priority sorting information; when the engine torque exceeds the torque threshold, reducing the flow of the proportional valve according to the priority sorting;

[0015] The controller can adjust the throttle opening of the engine according to the total power of the hydraulic system, so that the output power of the engine at the throttle opening is adapted to the total power of the hydraulic system; and dynamically update the torque threshold of the engine according to the real-time throttle opening of the engine.

[0016] Optionally, the travel motor is used to drive a crawler chassis, which includes a first travel motor and a second travel motor; the first travel motor is used to drive a first side crawler of the chassis of the drainage device, and the second travel motor is used to drive a second side crawler of the chassis of the drainage device;

[0017] The water pump motor comprises: a first water pump motor and a second water pump motor; the first water pump motor is used to drive the first water pump to work, and the second water pump motor is used to drive the second water pump to work;

[0018] The external output interface includes: a first external output interface, a second external output interface, and a third external output interface;

[0019] The proportional valves include: a first proportional reversing valve, a second proportional reversing valve, a third proportional reversing valve, a fourth proportional reversing valve, and a fifth proportional reversing valve;

[0020] The first travel motor is connected to the oil supply pipeline through a first proportional reversing valve; the first proportional reversing valve can adjust the direction and flow of the oil input into the first travel motor;

[0021] The second travel motor is connected to the oil supply pipeline through a second proportional reversing valve; the second proportional reversing valve can adjust the direction and flow of the oil input into the second travel motor;

[0022] The first water pump motor and the first external output interface are connected to the oil supply pipeline through a third proportional reversing valve; the third proportional reversing valve can switch the oil supply pipeline to the first water pump motor or the first external output interface, and can adjust the flow rate;

[0023] The second water pump motor and the second external output interface are connected to the oil supply pipeline through a fourth proportional reversing valve; the fourth proportional reversing valve can switch the oil supply pipeline to the second water pump motor or the second external output interface, and can adjust the flow rate;

[0024] The lifting cylinder and the third external output interface are connected to the oil supply pipeline via a fifth proportional reversing valve; the fifth proportional reversing valve can switch the oil supply pipeline to the lifting cylinder or the third external output interface and can adjust the flow rate;

[0025] The controller is respectively connected to the first proportional reversing valve, the second proportional reversing valve, the third proportional reversing valve, the fourth proportional reversing valve, and the fifth proportional reversing valve to control the flow of each proportional reversing valve.

[0026] Optionally, the first external output interface and the second external output interface are connected via a converging pipeline; the converging pipeline is provided with a switch valve for controlling the on-off of the converging pipeline, and a one-way valve for limiting the one-way flow of oil.

[0027] Optionally, the controller can also perform the following process: receiving the numbering information input from the control input component, and determining the corresponding proportional reversing valve based on the numbering information, wherein each proportional reversing valve corresponds to a number; when the engine torque exceeds the torque threshold, reducing the flow of the proportional reversing valve whose number is not included in the numbering information.

[0028] Optionally, in the case where the third proportional reversing valve is switched to the first water pump motor, when the engine torque exceeds a torque threshold, the flow rates of some or all of the proportional reversing valves other than the third proportional reversing valve are reduced;

[0029] In the case where the fourth proportional reversing valve is switched to the second water pump motor, when the engine torque exceeds a torque threshold, the flow rates of some or all of the proportional reversing valves other than the fourth proportional reversing valve are reduced.

[0030] Optionally, when the load demand is met, the controller adjusts the throttle opening of the engine to keep the engine speed within a predetermined low fuel consumption speed range; the low fuel consumption speed range has a speed upper limit value.

[0031] Optionally, when the water pump motor is started, the controller gradually increases the flow of the water pump motor by adjusting the flow of the corresponding proportional valve; when the water pump motor is turned off, the controller gradually decreases the flow of the water pump motor by adjusting the flow of the corresponding proportional valve.

[0032] In this application, the travel motor, water pump motor, lifting cylinder, and external output interface are all connected to the oil supply pipeline through a proportional valve. The controller can adjust the proportional valve of each actuator in real time according to the engine power characteristic curve, adjust the system output flow, make the power demand of the entire system within the engine output power range, avoid excessive torque causing the engine to slow down or even stall, and ensure that each actuator can work smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the external structure of the drainage equipment in the embodiment of the present application.

[0034] Figure 2 It is a schematic block diagram of the hydraulic system for drainage equipment in an embodiment of the present application.

[0035] Figure 3 It is another schematic block diagram of the hydraulic system for drainage equipment in an embodiment of the present application.

[0036] Figure 4 It is a structural schematic diagram of the hydraulic system for drainage equipment in an embodiment of the present application.

[0037] Figure numerals: hydraulic power unit 10, oil tank 11, hydraulic pump 12, engine 13, travel motor 20, first travel motor 21, second travel motor 22, water pump motor 30, first water pump motor 31, second water pump motor 32, lifting cylinder 40, external output interface 50, first external output interface 51, second external output interface 52, third external output interface 53, proportional valve 60, first proportional reversing valve 61, second proportional reversing valve 62, third proportional reversing valve 63, fourth proportional reversing valve 64, fifth proportional reversing valve 65, controller 70, chassis 80, first side track 81, second side track 82, converging pipeline 90, switch valve 91, one-way valve 92, control input component 100, pressure sensor 110. DETAILED DESCRIPTION

[0038] The following is the specific embodiment of the present application and in conjunction with the accompanying drawings, the technical scheme of the present application is further described, but the present application is not limited to these embodiments. In the following description, specific details such as specific configuration and assembly are provided only to help fully understand the embodiments of the present application. Therefore, it should be clear to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, for clarity and brevity, the description of known functions and structures has been omitted.

[0039] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other.

[0040] In this application, the drainage equipment is driven by a hydraulic system, a water pump is arranged on the chassis, and both the water pump and the chassis are hydraulically driven. In the hydraulic system of the drainage equipment, the engine is the main power source, and the engine drives the hydraulic pump to provide pressurized oil to the travel motor, water pump motor, lifting cylinder, etc. In some cases, when the drainage equipment is traveling and the water pump is working at the same time or the water pump and multiple external outputs are working at the same time, the engine will slow down or even stall due to excessive load.

[0041] Figure 1 The schematic diagram of the structure of the drainage equipment is shown. A water pump is arranged on the crawler chassis. Tracks are arranged on both sides of the crawler chassis, and two water pumps are arranged. The water pump is driven by a water pump motor, and the crawler is driven by a travel motor; both the water pump motor and the travel motor are hydraulic motors.

[0042] Figure 2 The schematic block diagram of the hydraulic system is shown. The hydraulic system includes: a hydraulic power unit 10, a travel motor 20, a water pump motor 30, a lifting cylinder 40, an external output interface 50, a proportional valve 60, and a controller 70. The hydraulic power unit 10 includes an oil tank 11, a hydraulic pump 12, and an engine 13; the output shaft of the engine is connected to the pump shaft of the hydraulic pump 12; the hydraulic pump 12 is used to absorb the oil in the oil tank 11 and pressurize and output the pressure oil to the oil supply pipeline. The travel motor 20 is used to drive the chassis 80 of the drainage equipment to travel; the water pump motor 30 is used to drive the water pump of the drainage equipment to work; the lifting cylinder 40 is used to drive the water pump of the drainage equipment to lift; the external output interface 50 is used to connect to the external hydraulic pipeline and output oil to it. The travel motor 20, the water pump motor 30, the lifting cylinder 40, and the external output interface 50 are all connected to the oil supply pipeline through the proportional valve 60. The controller 70 is used to adjust the flow of each proportional valve 60 in real time to keep the torque of the engine 13 dynamic within the set range.

[0043] It should be noted that according to the engine power curve, the output torque of the engine at the operating speed N is M1, the torque calculation formula of the hydraulic pump is M2 = P×q / (2*3.14), the output flow of the hydraulic pump is Q=q*N, P is the system pressure, q is the displacement of the hydraulic pump, Q=2×3.14×N×M2 / P. In order to make the torque M2 of the hydraulic pump smaller than the output torque M1 of the engine, the allowable flow value of the hydraulic system is Q≤2×3.14×N×M1 / P. As the load pressure P changes, the output flow allowed by the system will also change.

[0044] Specifically, the lifting cylinder 40 can be used to drive the water pump to move up and down. When draining water, the lifting cylinder 40 can drive the water pump to lower its height so that the water pump can enter the water surface to absorb water. When the chassis is traveling, the lifting cylinder 40 can drive the water pump to rise so that the drainage equipment can travel normally and ensure passability.

[0045] The hydraulic power unit 10 includes an oil tank 11, a hydraulic pump 12, and an engine 13. The engine 13 drives the hydraulic pump 12 to work. When the hydraulic pump 12 is working, it absorbs the oil in the oil tank 11 and pressurizes and outputs the pressure oil to the oil supply pipeline. The travel motor 20, the water pump motor 30, the lifting cylinder 40, and the external output interface 50 are all connected to the oil supply pipeline through the proportional valve 60. The controller can adjust the proportional valve of each actuator in real time according to the engine power characteristic curve, adjust the system output flow, so that the power required by the entire system is within the engine output power range, avoid excessive torque causing the engine to slow down or even stall, thereby ensuring that each actuator can work smoothly.

[0046] In one embodiment of the present application, the hydraulic system further includes a pressure sensor 110 for measuring the working pressure of the hydraulic system. The controller 70 calculates the torque of the engine 13 in real time according to the flow of each proportional valve and the pressure measured by the pressure sensor; and compares the calculated torque of the engine 13 with the torque threshold, and adjusts the flow of each proportional valve in real time according to the comparison result, so that the torque of the engine 13 is dynamically maintained within the set range. Specifically, the power of the hydraulic system is determined by the flow and the working pressure. The controller can obtain the opening of each proportional valve to determine the flow of each proportional valve; the working pressure is measured by the pressure sensor. The engine speed is fixed at a certain throttle opening. At this throttle opening, when the power of the hydraulic system is too large, the torque of the engine will be too large. Therefore, the controller adjusts the proportional valves of each actuator in real time according to the engine power characteristic curve, adjusts the system output flow, so that the power required by the entire system is within the engine output power range, and avoids excessive torque causing the engine to slow down or even stall.

[0047] Furthermore, the hydraulic system also includes a control input component, and the controller can perform the following process: receiving priority sorting information input from the control input component, and prioritizing each proportional valve according to the priority sorting information; when the engine torque exceeds the torque threshold, reducing the flow of the proportional valve according to the priority sorting.

[0048] In one embodiment of the present application, the controller 70 can adjust the throttle opening of the engine 13 according to the total power of the hydraulic system, so that the output power of the engine 13 at the throttle opening is adapted to the total power of the hydraulic system; and dynamically update the torque threshold of the engine 13 according to the real-time throttle opening of the engine 13; when the torque of the engine 13 exceeds the current real-time torque threshold, the controller 70 reduces the flow of part or all of the proportional valves.

[0049] When working, the controller 70 will first adjust the engine's throttle opening in real time according to the total power of the load, so that the engine speed is adapted to the total power of the hydraulic system, and then perform flow control on this basis. On the one hand, the controller 70 adjusts the engine speed to match the total power of the load, so that the engine can be kept within a reasonable speed range to obtain a higher energy conversion efficiency, and the torque will not be too large during this process, and there will be no speed drop or flameout. On the other hand, the controller can also dynamically update the torque threshold of the engine 13 according to the real-time throttle opening of the engine 13; when the torque of the engine 13 exceeds the current real-time torque threshold, the controller 70 will reduce the flow of some or all of the proportional valves.

[0050] In one embodiment of the present application, when the load demand is met, the controller 70 adjusts the throttle opening of the engine 13 to keep the speed of the engine 13 within a predetermined low fuel consumption speed range; the low fuel consumption speed range has a speed upper limit. In this solution, the low fuel consumption speed range can be calibrated according to the characteristics of the engine, including an upper limit and a lower limit.

[0051] Furthermore, when the device is working, an economic mode can be realized. In this mode, the controller 70 can also dynamically adjust the throttle opening of the engine 13 according to the real-time fuel consumption of the engine to search for the lowest point of the real-time fuel consumption of the engine 13. In this process, the controller can also dynamically update the torque threshold of the engine 13 according to the real-time throttle opening of the engine 13; when the torque of the engine 13 exceeds the current real-time torque threshold, the controller 70 reduces the flow of part or all of the proportional valves. With the above adjustment method, the engine torque will not be too large, and there will be no speed drop and flameout under the condition of meeting the load demand, and the real-time fuel consumption of the engine 13 can be kept at the lowest point, with high fuel economy efficiency.

[0052] In this application, the travel motor, water pump motor, lifting cylinder, and external output interface are all connected to the oil supply pipeline through a proportional valve. The controller can adjust the proportional valve of each actuator in real time according to the engine power characteristic curve, adjust the system output flow, make the power demand of the entire system within the engine output power range, avoid excessive torque causing the engine to slow down or even stall, and ensure that each actuator can work smoothly.

[0053] Figure 3 Another schematic block diagram of the hydraulic system for drainage equipment in the embodiment of the present application is shown. Figure 3In the block diagram shown, the travel motor is used to drive the crawler chassis, which includes a first travel motor 21 and a second travel motor 22; the first travel motor 21 is used to drive the first side crawler 81 of the chassis of the drainage equipment, and the second travel motor 22 is used to drive the second side crawler 82 of the chassis of the drainage equipment. The water pump motor includes a first water pump motor 31 and a second water pump motor 32; the first water pump motor 31 is used to drive the first water pump to work, and the second water pump motor 32 is used to drive the second water pump to work; the external output interface includes: a first external output interface 51, a second external output interface 52, and a third external output interface 53.

[0054] The proportional valve 60 includes: a first proportional reversing valve 61, a second proportional reversing valve 62, a third proportional reversing valve 63, a fourth proportional reversing valve 64, and a fifth proportional reversing valve 65; the first travel motor 21 is connected to the oil supply pipeline through the first proportional reversing valve 61; the first proportional reversing valve 61 can adjust the direction and flow of the oil input to the first travel motor 21; the second travel motor 22 is connected to the oil supply pipeline through the second proportional reversing valve 62; the second proportional reversing valve 62 can adjust the direction and flow of the oil input to the second travel motor 22; the first water pump motor 31 and the first external output interface 51 are connected to the oil supply pipeline through the third proportional reversing valve 63; the third proportional reversing valve 63 can switch the oil supply pipeline to the first water pump motor 31 or the first external output interface Port 51, and can adjust the flow; the second water pump motor 32 and the second external output interface 52 are connected to the oil supply pipeline through the fourth proportional reversing valve 64; the fourth proportional reversing valve 64 can switch the oil supply pipeline to the second water pump motor 32 or the second external output interface 52, and can adjust the flow; the lifting cylinder and the third external output interface 53 are connected to the oil supply pipeline through the fifth proportional reversing valve 65; the fifth proportional reversing valve 65 can switch the oil supply pipeline to the lifting cylinder or the third external output interface 53, and can adjust the flow; the controller 70 is respectively connected to the first proportional reversing valve 61, the second proportional reversing valve 62, the third proportional reversing valve 63, the fourth proportional reversing valve 64, and the fifth proportional reversing valve 65 to control the flow of each proportional reversing valve.

[0055] Also refer to Figure 4, the first travel motor 21 is connected to the oil supply pipeline through the first proportional reversing valve 61; the first proportional reversing valve 61 can adjust the direction and flow of the oil input to the first travel motor 21; the second travel motor 22 is connected to the oil supply pipeline through the second proportional reversing valve 62; the second proportional reversing valve 62 can adjust the direction and flow of the oil input to the second travel motor 22. The first travel motor 21 and the second travel motor 22 are respectively used to drive the crawlers on both sides of the chassis of the drainage equipment to travel. When the first proportional reversing valve 61 and the second proportional reversing valve 62 adjust the oil flow direction to make the first travel motor 21 and the second travel motor 22 rotate forward at the same time, the crawler chassis moves forward; when the first proportional reversing valve 61 and the second proportional reversing valve 62 adjust the oil flow direction to make the first travel motor 21 and the second travel motor 22 reverse at the same time, the crawler chassis moves backward; when the first proportional reversing valve 61 and the second proportional reversing valve 62 adjust the oil flow direction to make the first travel motor 21 and the second travel motor 22 rotate in different directions, the crawler chassis can turn. Therefore, on one hand, the first proportional reversing valve 61 and the second proportional reversing valve 62 can control the first travel motor 21 and the second travel motor 22 to rotate forward and reverse to realize the forward, backward and turning movement of the crawler chassis. On the other hand, the first proportional reversing valve 61 and the second proportional reversing valve 62 can also control the flow of the first travel motor 21 and the second travel motor 22 to control the moving speed of the crawler chassis.

[0056] Further, the first water pump motor 31 is used to drive the first water pump to work, and the second water pump motor 32 is used to drive the second water pump to work; the third proportional reversing valve 63 can switch the oil supply pipeline to connect to the first water pump motor 31 or the first external output interface 51; the fourth proportional reversing valve 64 can switch the oil supply pipeline to connect to the second water pump motor 32 or the second external output interface 52. On the one hand, the third proportional reversing valve 63 and the fourth proportional reversing valve 64 can switch the oil circuit and control the flow in the oil circuit.

[0057] The controller can adjust the first proportional reversing valve, the second proportional reversing valve, the third proportional reversing valve, the fourth proportional reversing valve and the fifth proportional reversing valve in real time according to the engine power characteristic curve, and adjust the system output flow so that the power demand of the entire system is within the engine output power range, avoiding excessive torque that causes the engine to slow down or even stall, thereby ensuring that all actuators can work smoothly.

[0058] In one embodiment of the present application, the first external output interface and the second external output interface 52 are connected via a merging pipeline 90; the merging pipeline 90 is provided with a switch valve 91 for controlling the on and off of the merging pipeline, and a one-way valve 92 for limiting the one-way flow of oil. When merging is required, the switch valve 91 is opened, and the merging pipeline 90 can be used to drive the flow on the two oil lines to merge, so as to meet the demand of the external hydraulic device for a larger hydraulic flow. When merging is not required, the switch valve 91 can be controlled to be closed.

[0059] In one embodiment of the present application, the hydraulic system further includes a control input component. The controller 70 can perform the following process: receiving priority sorting information input from the control input component, and prioritizing the first proportional reversing valve, the second proportional reversing valve, the third proportional reversing valve 63, the fourth proportional reversing valve 64, and the fifth proportional reversing valve 65 according to the priority sorting information; when the torque of the engine 13 exceeds the torque threshold, reducing the flow of the proportional reversing valve according to the priority sorting.

[0060] Specifically, the control input component can be a button, a touch screen, etc., which can be used to input control instructions to the controller. Here, the operator inputs priority sorting information to the controller with the help of the control input component. After obtaining the priority sorting information, the controller prioritizes the first proportional reversing valve, the second proportional reversing valve, the third proportional reversing valve, the fourth proportional reversing valve, and the fifth proportional reversing valve according to the priority sorting information. When the engine torque exceeds the torque threshold, the flow of the proportional reversing valve is reduced according to the priority sorting.

[0061] Furthermore, the controller 70 can also perform the following process: receiving the numbering information input from the control input component 100, and determining the corresponding proportional reversing valve based on the numbering information, wherein each proportional reversing valve corresponds to a number; when the torque of the engine 13 exceeds the torque threshold, reducing the flow of the proportional reversing valve whose number is not included in the numbering information.

[0062] Specifically, when it is necessary to keep the output of one or more oil circuits from being reduced in flow rate so that the corresponding hydraulic device can work without interference, the operator can use the number information input by the control input component. When the controller receives the number information, it determines the corresponding proportional reversing valve according to the number information. When the engine torque exceeds the torque threshold, the flow rate of the proportional reversing valve whose number is not included in the number information is reduced. In this way, when the engine torque exceeds the current real-time torque threshold, by adjusting the flow rate of the proportional reversing valve that is not in the set number, the oil supply of the set one or more oil circuits is not affected.

[0063] In one embodiment of the present application, when the third proportional reversing valve 63 is switched to the first water pump motor 31, when the torque of the engine 13 exceeds the torque threshold, the flow of the other part or all proportional reversing valves other than the third proportional reversing valve 63 is reduced; when the fourth proportional reversing valve 64 is switched to the second water pump motor 32, when the torque of the engine 13 exceeds the torque threshold, the flow of the other part or all proportional reversing valves other than the fourth proportional reversing valve 64 is reduced. When the first water pump motor 31 and the second water pump motor 32 are in the working state, the flow supply other than the water pump is preferentially adjusted to reduce.

[0064] In one embodiment of the present application, when the water pump motor is started, the controller gradually increases the flow of the water pump motor by adjusting the flow of the corresponding proportional valve; when the water pump motor is turned off, the controller gradually reduces the flow of the water pump motor by adjusting the flow of the corresponding proportional valve.

[0065] Specifically, when the water pump is turned on, the water pressure is relatively high. By adjusting the proportional valve flow rate to slowly turn on the water pump, the water flow can gradually fill the pipeline to avoid a large impact on the pipeline and equipment when it is opened to the maximum. When shutting down, the proportional valve flow rate can be adjusted to slowly close to avoid the negative pressure effect caused by instantaneous closure, which may cause back suction at the water pump output port and damage the water hose. In addition, except for the water pump, other output circuits can use proportional valves to slowly open or close to prevent impact, making the equipment run safer and more stable.

[0066] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0067] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. It should be noted that the terms used here are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, work, devices, components and / or combinations thereof.

[0068] The specific embodiments described herein are merely examples of the technical solutions of the present application. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the scope defined by the claims of the present application.

Claims

1. A hydraulic system for drainage equipment, characterized in that: The hydraulic system comprises: The hydraulic power unit comprises an oil tank, a hydraulic pump and an engine; the output shaft of the engine is dynamically connected to the pump shaft of the hydraulic pump; the hydraulic pump is used to absorb the oil in the oil tank and pressurize and output the pressure oil to the oil supply pipeline; Travel motor, used to drive the chassis of the drainage equipment to travel; Water pump motor, used to drive the water pump of drainage equipment; A lifting cylinder is used to drive the water pump of the drainage equipment to move up and down; An external output interface is used to connect to an external hydraulic pipeline and output oil to it; The travel motor, the water pump motor, the lifting cylinder, and the external output interface are all connected to the oil supply pipeline through a proportional valve; The controller is used to adjust the flow of each proportional valve in real time to keep the engine torque dynamic within the set range; The pressure sensor is used to measure the working pressure of the hydraulic system; the controller calculates the engine torque in real time according to the flow of each proportional valve and the pressure measured by the pressure sensor; and compares the calculated engine torque with the torque threshold, and adjusts the flow of each proportional valve in real time according to the comparison result, so that the engine torque is dynamically maintained within the set range; The control input component is capable of executing the following process: receiving priority sorting information input from the control input component, and prioritizing each proportional valve according to the priority sorting information; when the engine torque exceeds the torque threshold, reducing the flow of the proportional valve according to the priority sorting; The controller can adjust the throttle opening of the engine according to the total power of the hydraulic system, so that the output power of the engine at the throttle opening is adapted to the total power of the hydraulic system; and dynamically update the torque threshold of the engine according to the real-time throttle opening of the engine.

2. The hydraulic system for drainage equipment according to claim 1, characterized in that: The travel motor is used to drive the crawler chassis, which includes a first travel motor and a second travel motor; the first travel motor is used to drive the first side crawler of the chassis of the drainage equipment, and the second travel motor is used to drive the second side crawler of the chassis of the drainage equipment; The water pump motor comprises: a first water pump motor and a second water pump motor; the first water pump motor is used to drive the first water pump to work, and the second water pump motor is used to drive the second water pump to work; The external output interface includes: a first external output interface, a second external output interface, and a third external output interface; The proportional valves include: a first proportional reversing valve, a second proportional reversing valve, a third proportional reversing valve, a fourth proportional reversing valve, and a fifth proportional reversing valve; The first travel motor is connected to the oil supply pipeline through a first proportional reversing valve; the first proportional reversing valve can adjust the direction and flow of the oil input into the first travel motor; The second travel motor is connected to the oil supply pipeline through a second proportional reversing valve; the second proportional reversing valve can adjust the direction and flow of the oil input into the second travel motor; The first water pump motor and the first external output interface are connected to the oil supply pipeline through a third proportional reversing valve; the third proportional reversing valve can switch the oil supply pipeline to the first water pump motor or the first external output interface, and can adjust the flow rate; The second water pump motor and the second external output interface are connected to the oil supply pipeline through a fourth proportional reversing valve; the fourth proportional reversing valve can switch the oil supply pipeline to the second water pump motor or the second external output interface, and can adjust the flow rate; The lifting cylinder and the third external output interface are connected to the oil supply pipeline via a fifth proportional reversing valve; the fifth proportional reversing valve can switch the oil supply pipeline to the lifting cylinder or the third external output interface and can adjust the flow rate; The controller is respectively connected to the first proportional reversing valve, the second proportional reversing valve, the third proportional reversing valve, the fourth proportional reversing valve, and the fifth proportional reversing valve to control the flow of each proportional reversing valve.

3. The hydraulic system for drainage equipment according to claim 2, characterized in that: The first external output interface and the second external output interface are connected via a converging pipeline; the converging pipeline is provided with a switch valve for controlling the on-off of the converging pipeline and a one-way valve for limiting the one-way flow of oil.

4. The hydraulic system for drainage equipment according to claim 2, characterized in that: The controller can also perform the following process: receiving the number information input from the control input component, and determining the corresponding proportional reversing valve based on the number information, wherein each proportional reversing valve corresponds to a number; when the engine torque exceeds the torque threshold, reducing the flow of the proportional reversing valve whose number is not included in the number information.

5. The hydraulic system for drainage equipment according to claim 2, characterized in that: In the case where the third proportional reversing valve is switched to the first water pump motor, when the engine torque exceeds a torque threshold, the flow rates of some or all of the proportional reversing valves other than the third proportional reversing valve are reduced; In the case where the fourth proportional reversing valve is switched to the second water pump motor, when the engine torque exceeds a torque threshold, the flow rates of some or all of the proportional reversing valves other than the fourth proportional reversing valve are reduced.

6. The hydraulic system for drainage equipment according to claim 1, characterized in that: When the load demand is met, the controller adjusts the throttle opening of the engine to keep the engine speed within a predetermined low fuel consumption speed range; the low fuel consumption speed range has a speed upper limit value.

7. The hydraulic system for drainage equipment according to claim 1, characterized in that: When the water pump motor is started, the controller gradually increases the flow of the water pump motor by adjusting the flow of the corresponding proportional valve; when the water pump motor is turned off, the controller gradually decreases the flow of the water pump motor by adjusting the flow of the corresponding proportional valve.

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