Hydraulically independent controlled hydrostatic loader and method of operation

Abstract

The application discloses a kind of hydraulic independent control's static hydraulic loader and method, by walking system and working system decoupling implementation, solved the problem that loader needs accelerator and brake simultaneously when loading and unloading, reduce the operation difficulty of loader;Technical scheme includes walking system, working system, engine, accelerator, operating handle and controller;The walking system includes drive axle, electric control variable walking motor and electric control variable walking pump, and the walking system is used to control the walking of loader;Electric control variable walking pump is connected with electric control variable walking motor, and electric control variable walking motor is connected with drive axle;The working system includes electric control variable working pump and working cylinder, and electric control variable working pump is connected with working cylinder, and the working system is used to control the action of working cylinder;Controller is respectively connected with accelerator, operating handle, walking system, engine and working system.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of loader equipment, in particular to a hydraulic independent control hydrostatic loader and working method. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] The loader is a heavy machinery commonly used for transferring goods, and the relationship between the walking and working of the loader requires the proficiency of the driver's operation, and the walking speed of the traditional loader depends on the engine speed, that is, depends on the size of the throttle; the action speed of the working device depends on the rotation speed of the working pump, and indirectly depends on the rotation speed of the engine (the pump is installed above the engine and driven by the engine), that is, depends on the size of the engine throttle, that is, the engine rotation speed is only controlled by the throttle.

[0004] In the existing loader, if the action speed of the working device needs to be accelerated during loading, the throttle must be depressed deeply to increase the engine speed; but the depression of the throttle will also accelerate the walking speed of the vehicle. The problem is extremely obvious when loading at a short distance, the loader is relatively close to the material port, at this time, the walking speed of the vehicle does not need to be fast, but the action speed of the working device needs to be fast, so that the driver is in a dilemma of needing to depress the throttle to accelerate the action speed of the working device and needing to depress the brake, resulting in the problems of fuel consumption and operation difficulty of the loader. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a hydraulic independent control hydrostatic loader and working method, which is realized by decoupling the walking system and the working system, and by adjusting the flow of the electric control variable walking pump and the electric control variable working pump, the problem that the driver needs to depress the throttle and the brake at the same time during loading and unloading of the loader is solved, and the operation difficulty of the loader is reduced.

[0006] In order to achieve the above purpose, the present application is realized by the following technical scheme:

[0007] In a first aspect, the present application provides a hydraulic independent control hydrostatic loader, comprising a walking system, a working system, an engine, a throttle, an operation handle and a controller; the walking system and the working system are independently controlled;

[0008] The walking system comprises a drive axle, an electric control variable walking motor and an electric control variable walking pump, and the walking system is used for controlling the walking of the loader; the electric control variable walking pump is connected with the electric control variable walking motor, and the electric control variable walking motor is connected with the drive axle;

[0009] The working system includes an electronically controlled variable displacement pump and a working cylinder. The electronically controlled variable displacement pump is connected to the working cylinder, and the working system is used to control the movement of the working cylinder.

[0010] The controller is connected to the throttle, control lever, walking system, engine, and working system.

[0011] Furthermore, the power output end of the engine is connected to the electronically controlled variable travel pump to provide power to the electronically controlled variable travel pump; the power output end of the engine is connected to the electronically controlled variable working pump to provide power to the electronically controlled variable working pump.

[0012] Furthermore, the signal input terminal is connected to a throttle and an operating handle.

[0013] Furthermore, the signal output terminal is connected to an engine, an electronically controlled variable travel pump, an electronically controlled variable travel motor, and an electronically controlled variable working pump.

[0014] Secondly, the present invention also provides a method for operating a hydrostatic loader with independent hydraulic control, comprising the following steps:

[0015] S1: Acquire throttle and lever electrical signals under different operating conditions;

[0016] S2: Calculate the required speed of the walking system and the working system, and obtain the maximum required speed;

[0017] S3: Obtain the required displacement of the electronically controlled variable displacement travel pump through the throttle electrical signal, and independently control the vehicle speed of the travel system;

[0018] S4: Obtain the required displacement of the electronically controlled variable pump through the handle's electrical signal, and independently control the operating speed of the working system.

[0019] Furthermore, the operating conditions in S1 include: operating conditions where the working system changes but the vehicle speed of the traveling system does not need to change, and operating conditions where the traveling system changes but the working system does not need to change.

[0020] Furthermore, the maximum required speed in S2 is calculated by the controller based on the required speed of the walking system and the required speed of the working system, and the magnitude of the obtained required speeds of the walking system and the working system is judged to obtain the maximum required speed among the two speeds.

[0021] Furthermore, in S3, the vehicle speed of the walking system is calculated by the controller based on the displacement of the electronically controlled variable travel pump and transmitted to the electronically controlled variable travel pump in the form of an electrical signal. The electronically controlled variable travel pump will adjust according to the electrical signal, and control the speed of the electronically controlled variable travel motor by controlling the hydraulic oil flow. The hydraulic flow of the working system remains constant to ensure that the working system's operating speed remains constant.

[0022] Further, the action speed of the working system in S4 is calculated by the controller, the displacement of the electrically-controlled variable working pump is transmitted to the electrically-controlled variable working pump in the form of an electric signal, the electrically-controlled variable working pump will be adjusted according to the electric signal, the action speed of the working oil cylinder is controlled by controlling the hydraulic oil flow, and the hydraulic flow of the traveling system is unchanged, so as to ensure that the vehicle speed is unchanged.

[0023] Further, the working system and the traveling system are decoupled, and the controller independently controls between the electrically-controlled variable traveling pump and the electrically-controlled variable working pump.

[0024] The beneficial effects of the present application are as follows:

[0025] The controller is connected with the accelerator, the operating handle, the traveling system, the engine and the working system, so that the controller can control the traveling system and the working system according to the accelerator electric signal and the handle electric signal, the independent control between the traveling system and the working system can be realized when the engine speed changes, and the linkage between the traveling system and the working system and the engine by mechanical connection in the traditional loader is solved.

[0026] The engine speed control and the displacement control of the electrically-controlled variable traveling pump and the electrically-controlled variable working pump are realized by obtaining the accelerator electric signal and the handle electric signal; when the working system changes and the vehicle speed is unchanged, the driver controls the handle, the controller controls the engine speed change, the electrically-controlled variable working pump speed increases, the working speed is accelerated, the electrically-controlled variable traveling pump speed changes, the displacement of the electrically-controlled variable traveling pump is adjusted by the controller, the hydraulic flow of the traveling system is unchanged, so as to ensure that the vehicle speed is unchanged; when the traveling system changes and the working system is unchanged, the accelerator signal changes, the controller controls the engine speed change, the electrically-controlled variable traveling pump speed increases, and the electrically-controlled variable traveling motor rotates; the electrically-controlled variable working pump speed changes, the displacement of the electrically-controlled variable working pump is adjusted by the controller, the hydraulic flow of the working system is unchanged, so as to ensure that the working device action speed is unchanged, the use of the accelerator and the brake is effectively reduced, the driving fatigue strength of the driver is reduced, and the problem that the working oil cylinder moves slowly under the condition of low accelerator in the traditional loader is solved. BRIEF DESCRIPTION OF DRAWINGS

[0027] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the description, explain the present application. The exemplary embodiments of the present application and their description are used to explain the present application without unduly limiting it.

[0028] Figure 1 It is a hydraulic independent control system schematic diagram of the present application. DETAILED DESCRIPTION

[0029] It should be noted that the following detailed description is illustrative only, and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0030] It is also important to note that the terms "including", "comprising", and "having" as used herein are specifically intended to be open and permit the inclusion of items that call be claimed even if these terms are used in certain places in this specification.

[0031] The hydraulic independent control static hydraulic loader disclosed by the embodiment of the application comprises a walking system, a working system, an engine, a throttle, an operating handle and a controller. Figure 1 The walking system comprises a drive axle, an electrically-controlled variable walking motor and an electrically-controlled variable walking pump, and is used for controlling the walking of the loader. The power output end of the engine is connected with the electrically-controlled variable walking pump, and is used for providing power for the electrically-controlled variable walking pump. The electrically-controlled variable walking pump is connected with the electrically-controlled variable walking motor, and the electrically-controlled variable walking motor is connected with the drive axle. The working system comprises an electrically-controlled variable working pump and a working oil cylinder, and is used for controlling the action of the working oil cylinder. The power output end of the engine is connected with the electrically-controlled variable working pump, and is used for providing power for the electrically-controlled variable working pump. The controller is connected with the throttle, the operating handle, the walking system, the engine and the working system respectively.

[0032] The controller comprises a signal input end and a signal output end. The throttle and the operating handle are connected with the signal input end. The action of the throttle is converted into a throttle signal by a sensor, and the throttle signal is transmitted to the controller. The action of the operating handle is also converted into a handle signal by a sensor, and the handle signal is transmitted to the controller. The engine, the electrically-controlled variable walking pump, the electrically-controlled variable walking motor and the electrically-controlled variable working pump are connected with the signal output end. The change parameters of the engine, the electrically-controlled variable walking pump, the electrically-controlled variable walking motor and the electrically-controlled variable working pump are controlled by the controller.

[0033] A working method of the hydraulic independent control static hydraulic loader comprises the following steps.

[0034] S1: Acquire throttle and lever electrical signals under different working conditions; the driver adjusts the throttle and working lever according to the actual working conditions. The actual working conditions include the following situations: First, the working system changes, but the vehicle speed of the travel system does not need to change. This working condition is mostly used in the process of loading and unloading goods by the loader; Second, the travel system changes, but the working system does not need to change. This working condition is mostly used in the process of transferring goods by the loader.

[0035] S2: Calculate the required speed of the walking system and the working system, and obtain the maximum required speed; based on the throttle and handle electrical signals obtained by the controller, the controller calculates the required speed of the walking system and the required speed of the working system, judges the magnitude of the obtained required speed of the walking system and the required speed of the working system, obtains the maximum required speed of the two speeds, and transmits it to the engine in the form of an electrical signal to ensure the power supply of the loader.

[0036] S3: Calculate the required displacement of the electronically controlled variable travel pump; based on the throttle signal obtained by the controller, the controller calculates the displacement of the electronically controlled variable travel pump and transmits it to the electronically controlled variable travel pump in the form of an electrical signal. The electronically controlled variable travel pump will adjust according to the electrical signal, control the speed of the electronically controlled variable travel motor by controlling the hydraulic oil flow, and then realize the loader's walking action through the drive axle.

[0037] S4: Calculate the required displacement of the electronically controlled variable displacement pump; based on the handle electrical signal obtained by the controller, the controller calculates the displacement of the electronically controlled variable displacement pump and transmits it to the electronically controlled variable displacement pump in the form of an electrical signal. The electronically controlled variable displacement pump will adjust according to the electrical signal, and control the working cylinder action speed by controlling the hydraulic oil flow, thereby realizing the loading and unloading action of the loader.

[0038] This invention achieves engine speed control and displacement control of the electronically controlled variable travel pump and electronically controlled variable working pump by acquiring throttle and handle electrical signals. The engine speed can be controlled by the throttle and the operating handle of the working device. The engine speed depends on the maximum speed required by the travel system and the working system. The throttle changes the vehicle speed by controlling the speed of the electronically controlled variable travel pump. The operating handle of the working device changes the operating speed of the working device by controlling the speed of the electronically controlled variable working pump.

[0039] The walking system is driven by hydrostatic pressure. The engine drives the electronically controlled variable travel pump, which in turn drives the electronically controlled variable travel motor. The displacement of the electronically controlled variable travel pump is controlled by the controller, and the speed of the electronically controlled variable travel motor is controlled by the displacement. The working system uses an electronically controlled variable working pump to supply oil to the working cylinder to achieve the working function.

[0040] When the working system changes, and the walking system speed does not change: the driver controls the handle, and the electric signal is transmitted to the controller, the controller controls the engine speed change, the electric control variable working pump speed increases, and the working speed is accelerated; at this time, the electric control variable walking pump speed changes, the displacement of the electric control variable walking pump is adjusted through the controller, the walking system hydraulic flow is unchanged, so as to ensure that the vehicle speed is unchanged, when the handle signal disappears, the displacement of the electric control variable walking pump returns to the initial value, effectively reducing the use of the accelerator and the brake, and reducing the driving fatigue strength of the driver.

[0041] When the walking system changes, and the working system does not change: the accelerator signal changes, the electric signal is transmitted to the controller, the controller controls the engine speed change, the electric control variable walking pump speed increases, and the electric control variable walking motor rotates; at this time, the electric control variable working pump speed changes, the displacement of the electric control variable working pump is adjusted through the controller, the working system hydraulic flow is unchanged, so as to ensure that the working device action speed is unchanged, when the accelerator signal disappears, the displacement of the electric control variable working pump returns to the initial value, compared with the traditional loader, the problem that the working cylinder moves slowly in the state of low accelerator is avoided, and the traditional loader needs to step on the accelerator to improve the engine speed to improve the working cylinder action speed, but at the same time, the vehicle speed also changes, so that the driver is in the dilemma of stepping on the accelerator to accelerate the working device action speed, and stepping on the brake.

[0042] The above only describes the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method of operating a hydraulically independent controlled hydrostatic loader, characterized in that, The hydraulic independent control static hydraulic loader comprises a walking system, a working system, an engine, a throttle, an operating handle and a controller; the walking system and the working system are independently controlled; The walking system comprises a drive axle, an electrically-controlled variable walking motor and an electrically-controlled variable walking pump, and is used for controlling the walking of the loader; the electrically-controlled variable walking pump is connected with the electrically-controlled variable walking motor, and the electrically-controlled variable walking motor is connected with the drive axle; The working system comprises an electrically-controlled variable working pump and a working oil cylinder, and the electrically-controlled variable working pump is connected with the working oil cylinder; the working system is used for controlling the action of the working oil cylinder; The controller is connected with the throttle, the operating handle, the walking system, the engine and the working system respectively. The working method comprises the following steps: S1: obtaining throttle electric signals and handle electric signals under different working conditions; S2: calculating the required rotating speeds of the walking system and the working system, and obtaining the maximum required rotating speed; S3: obtaining the required displacement of the electrically-controlled variable walking pump through the throttle electric signals, and independently controlling the speed of the walking system while keeping the hydraulic flow of the working system unchanged, so as to keep the action speed of the working system unchanged; S4: obtaining the required displacement of the electrically-controlled variable working pump through the handle electric signals, and independently controlling the action speed of the working system while keeping the hydraulic flow of the walking system unchanged, so as to keep the speed of the walking system unchanged.

2. A method of operating a hydraulically independent controlled hydrostatic loader as set forth in claim 1, characterized in that, The power output end of the engine is connected with the electrically-controlled variable walking pump, and is used for providing power for the electrically-controlled variable walking pump; the power output end of the engine is connected with the electrically-controlled variable working pump, and is used for providing power for the electrically-controlled variable working pump.

3. A method of operating a hydraulically independent controlled hydrostatic loader as set forth in claim 1, characterized in that, The signal input end of the controller is connected with the throttle and the operating handle.

4. A method of operating a hydraulically independent controlled hydrostatic loader as set forth in claim 1, characterized in that, The signal output end of the controller is connected with the engine, the electrically-controlled variable walking pump, the electrically-controlled variable walking motor and the electrically-controlled variable working pump.

5. A method of operating a hydraulically independent controlled hydrostatic loader as set forth in claim 1, characterized in that, The working conditions in S1 comprise the working condition that the working system changes while the speed of the walking system does not need to change, and the working condition that the walking system changes while the working system does not need to change.

6. A method of operating a hydraulically independent controlled hydrostatic loader as set forth in claim 1, characterized in that, The maximum required rotating speed in S2 is obtained by calculating the required rotating speed of the walking system and the required rotating speed of the working system through the controller, and judging the sizes of the required rotating speed of the walking system and the required rotating speed of the working system.

7. A method of operating a hydraulically independent controlled hydrostatic loader as set forth in claim 1, characterized in that, The speed of the walking system in S3 is obtained by calculating the displacement of the electrically-controlled variable walking pump through the controller, and transmitting the electric signals to the electrically-controlled variable walking pump; the electrically-controlled variable walking pump is adjusted according to the electric signals, and the rotating speed of the electrically-controlled variable walking motor is controlled through the hydraulic oil flow.

8. A method of operating a hydraulically independent controlled hydrostatic loader as set forth in claim 1, characterized in that, The action speed of the working system in S4 is obtained by calculating the displacement of the electrically-controlled variable working pump through the controller, and transmitting the electric signals to the electrically-controlled variable working pump; the electrically-controlled variable working pump is adjusted according to the electric signals, and the action speed of the working oil cylinder is controlled through the hydraulic oil flow.

9. A method of operating a hydraulically independent controlled hydrostatic loader as set forth in claim 1, characterized in that, The working system and the walking system are decoupled, and the controller independently controls the electrically-controlled variable walking pump and the electrically-controlled variable working pump.

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