A control method and system for an electro-hydraulic pump in an underground loader, and the underground loader itself.

Abstract

This invention discloses a control method, system, and underground loader for an electro-hydraulic pump, belonging to the field of engineering machinery technology. The method includes acquiring the engine speed; acquiring the battery pack status, electro-hydraulic pump temperature status, and the position of the operating handle; and controlling whether the electro-hydraulic pump is turned on based on the battery pack status, electro-hydraulic pump temperature status, and operating handle position. This invention controls the operation of the electro-hydraulic pump by using the battery pack status, electro-hydraulic pump temperature status, and operating handle position, effectively reducing system back pressure, thereby reducing unnecessary energy consumption and improving equipment economy.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery technology, and more specifically, to a control method and system for an electro-hydraulic pump of an underground loader, as well as the underground loader itself. Background Technology

[0002] Underground loaders are mainly used in mines for loading and transporting loose materials after blasting. They can also be used in railway, highway and hydropower tunnel projects. They are suitable for working conditions, narrow, low and muddy work surfaces.

[0003] The hydraulic systems of underground loaders are mostly fixed-displacement systems. These systems consume a significant amount of energy even when the hydraulic system is not in operation, resulting in unnecessary energy loss and increased operating costs. They also cause unnecessary wear and tear on gear pumps, reducing their lifespan and increasing maintenance costs. Simultaneously, the generator's excessive capacity leads to unnecessary energy consumption. Based on calculations of the loader's operating conditions, hydraulic lifting and tipping are used infrequently throughout the work cycle, yet their energy consumption is substantial.

[0004] A search revealed the invention titled: "A Closed-Center Quantitative Hydraulic System for a Scraper and a Scraper" (Chinese Patent Application No.: CN202120467850.8, Application Date: March 3, 2021). This application discloses a hydraulic oil tank, a quantitative hydraulic pump, a multi-way valve, a tipping cylinder, a lifting cylinder, and a lifting cylinder. The multi-way valve includes a pressure reducing valve, a directional valve, a solenoid valve, a pressure compensator, a shuttle valve, and a shuttle valve. When the solenoid valve is energized, hydraulic oil flows through the pressure reducing valve... When the solenoid valve is energized, the hydraulic oil flows into the tipping cylinder after passing through the pressure compensator and the solenoid valve. When the solenoid valve is energized, the hydraulic oil flows into the lifting cylinder after passing through the pressure compensator and the solenoid valve. When the solenoid valve is energized, the pressure compensator monitors the pressure in the tipping cylinder and the lifting cylinder through the shuttle valve and the shuttle valve, respectively, and compensates for the pressure difference between the tipping cylinder and the lifting cylinder, thereby realizing the compound action.

[0005] The closed-center quantitative hydraulic system used in the aforementioned application has a gear pump that is always running, consuming a large amount of energy and causing unnecessary energy loss. Summary of the Invention

[0006] 1. The technical problem that the invention aims to solve

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a control method, system and underground shovel truck for an electro-hydraulic pump. The method controls whether the electro-hydraulic pump works by controlling the status of the battery pack, the temperature of the electro-hydraulic pump and the position of the operating handle, effectively reducing system back pressure, thereby reducing unnecessary energy consumption and improving the economy of the equipment.

[0008] 2. Technical Solution

[0009] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0010] The present invention provides a control method for an electro-hydraulic pump in an underground loader, comprising:

[0011] Get engine speed status;

[0012] Acquire the status of the battery pack, the temperature of the electrohydraulic pump, and the position of the control handle;

[0013] The electrohydraulic pump is controlled to be turned on or off based on the battery pack status, the temperature of the electrohydraulic pump, and the position of the operating handle.

[0014] As a further improvement of the present invention, the method for obtaining engine speed status includes:

[0015] Determine if the key switch is in the ON position;

[0016] By detecting the engine speed signal output by the engine sensor, it can be determined whether the speed is equal to zero or greater than zero.

[0017] As a further improvement of the present invention, the method for controlling whether the electro-hydraulic pump is turned on based on the battery pack status, the electro-hydraulic pump temperature status, and the position of the operating handle includes:

[0018] If the battery pack status is outside the preset value, the operating handle is not in the start position or is in the position, or the electro-hydraulic pump temperature is greater than or less than the preset value, the electro-hydraulic pump will not start.

[0019] If the battery pack status is within the preset value, the operating handle is not in the gear position, or the electro-hydraulic pump temperature is greater than or less than the preset value, the electro-hydraulic pump will not be turned on.

[0020] If the battery pack status is within the preset value, the operating handle is in the gear position, and the electro-hydraulic pump temperature is greater than the preset value, the electro-hydraulic pump will not be turned on.

[0021] If the battery pack status is within the preset value, the operating handle is in the gear position, and the electro-hydraulic pump temperature is less than the preset value, the electro-hydraulic pump will be turned on.

[0022] As a further improvement of the present invention, the method for obtaining the battery pack status, the electro-hydraulic pump temperature status, and the position status of the operating handle includes:

[0023] The voltage sensor is used to determine whether the voltage of the battery pack is greater than a preset value.

[0024] The temperature sensor is used to determine whether the temperature of the battery pack is lower than a preset value.

[0025] The temperature sensor is used to measure whether the coil temperature of the electro-hydraulic pump is greater than a preset value.

[0026] By detecting the gear position signal, it can be determined whether the operating handle is in the start position or not.

[0027] The present invention provides a control system for an electro-hydraulic pump of an underground loader, comprising the aforementioned control system for an electro-hydraulic pump of an underground loader, and further comprising,

[0028] The main controller module is electrically connected to the engine control module, and the engine control module sends a first signal to the main controller module.

[0029] An operating handle module, wherein the main controller module is electrically connected to the operating handle module, and the operating handle module sends a second signal to the active controller module; and...

[0030] An electro-hydraulic pump control module is provided, wherein the main controller module is electrically connected to the electro-hydraulic pump control module, and the main controller module sends a third signal to the electro-hydraulic pump control module.

[0031] As a further improvement of the present invention, it also includes a battery pack control module, which is electrically connected to the main controller module and sends a fourth signal to the main controller module.

[0032] As a further improvement of the present invention, the fourth signal includes the voltage signal value of the battery pack and the temperature signal value of the battery pack.

[0033] As a further improvement of the present invention, it also includes an electro-hydraulic pump temperature detection module, which is electrically connected to the main controller module and sends a fifth signal to the main controller module.

[0034] An underground loader of the present invention includes a control system for the electro-hydraulic pump of the aforementioned underground loader, and further includes,

[0035] An electro-hydraulic pump, comprising a gear pump and a motor, wherein the gear pump is driven by the motor;

[0036] A battery pack, electrically connected to the motor, supplying power to the motor; and,

[0037] A generator, which is electrically connected to a battery pack, charges the battery pack.

[0038] As a further improvement of the present invention, the engine is connected to the generator, and the engine drives the generator to rotate.

[0039] 3. Beneficial effects

[0040] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0041] (1) This invention replaces the traditional quantitative gear pump with an electro-hydraulic pump controlled by a motor, so that the lifting and tilting systems of the loader are both controlled by the electro-hydraulic pump. The lifting and tilting systems provide the required flow rate as needed, effectively reducing the system back pressure. The electro-hydraulic pump is composed of a 24V motor and a gear pump, which effectively reduces the risk during use, increases the safety of the equipment, and greatly reduces energy consumption.

[0042] (2) The present invention utilizes the main controller to electrically connect with the battery pack controller, the electro-hydraulic pump and the operating handle. By acquiring the battery pack status, the electro-hydraulic pump temperature status and the position status of the operating handle, the electro-hydraulic pump is controlled to operate. The electro-hydraulic pump is started according to the actual working conditions. At the same time, the generator effectively charges the battery pack, thereby reducing unnecessary energy consumption and improving the economy of the equipment. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the control method steps for an electro-hydraulic pump.

[0044] Figure 2 The specific method for controlling whether the electrohydraulic pump is turned on based on the battery pack status, the temperature of the electrohydraulic pump, and the position of the operating handle;

[0045] Figure 3 This is a schematic diagram of the control system for the electro-hydraulic pump of an underground loader.

[0046] Explanation of the labels in the diagram:

[0047] 1. Main controller module; 2. Engine control module; 3. Operating handle module; 4. Electro-hydraulic pump control module; 5. Battery pack control module; 6. Electro-hydraulic pump temperature detection module. Detailed Implementation

[0048] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments.

[0049] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0050] The present invention will be further described below with reference to embodiments. For example... Figures 1-2 The present invention provides a control method for an electro-hydraulic pump in an underground loader, comprising:

[0051] Step S100: Obtain engine speed status. In one embodiment of the present invention, step S100 may include:

[0052] Step S101: Determine whether the key switch is in the OFF position. When the key switch is in the OFF position, it means that the key switch is not in the OFF state. When the key switch is in the ON position, it means that the key switch is in the OFF state.

[0053] Step S102: Determine whether the engine speed is equal to zero or greater than zero by detecting the engine speed signal output by the engine sensor.

[0054] When the engine speed is zero, it means the engine is not started; when the engine speed is greater than zero, it means the engine is started.

[0055] Step S200: Obtain the battery pack status, the electrohydraulic pump temperature status, and the position of the operating handle. In one embodiment of the present invention, step S200 may include:

[0056] S201: Determine whether the voltage of the battery pack is greater than a preset value using a voltage sensor;

[0057] S202: Determine whether the temperature of the battery pack is lower than a preset value using a temperature sensor;

[0058] S203: Measure whether the coil temperature of the electro-hydraulic pump is greater than the preset value using a temperature sensor;

[0059] S204: By detecting the gear position signal, determine whether the operating handle is in the start position or not.

[0060] Step S300: Based on the battery pack status, the electrohydraulic pump temperature, and the position of the operating handle, control whether the electrohydraulic pump is turned on. In one embodiment of the present invention, step S300 may include:

[0061] Step S301: If the battery pack status is outside the preset value, the operating handle is not in the start position or is in the position, or the electro-hydraulic pump temperature is greater than or less than the preset value, then the electro-hydraulic pump will not be turned on.

[0062] Step S302: If the battery pack status is within the preset value, the operating handle is not in the gear position, or the electro-hydraulic pump temperature is greater than or less than the preset value, then the electro-hydraulic pump will not be turned on.

[0063] Step S303: If the battery pack status is within the preset value, the operating handle is in the gear position, and the electrohydraulic pump temperature is greater than the preset value, then the electrohydraulic pump will not be turned on.

[0064] Step S304: If the battery pack status is within the preset value, the operating handle is in the gear position, and the electrohydraulic pump temperature is less than the preset value, then the electrohydraulic pump is turned on.

[0065] The condition of the battery pack being outside the preset value refers to whether the voltage of the battery pack is greater than the preset value as measured by a voltage sensor, and whether the temperature of the battery pack is less than the preset value as measured by a temperature sensor. The preferred preset voltage value is 32V. That is, when the voltage sensor in the battery pack measures an output voltage lower than 32V, the battery pack is considered to be outside the preset value; conversely, when the voltage sensor measures an output voltage higher than 32V, the battery pack is considered to be within the preset value.

[0066] Furthermore, the preferred battery pack temperature is set to 60°C. This means that if the temperature sensor within the battery pack measures a temperature higher than 60°C, the battery pack is considered to be outside the preset value; conversely, if the temperature sensor measures a temperature lower than 60°C, the battery pack is considered to be within the preset value. It is important to note that the battery pack is considered to be within the preset value only if both its voltage output value is higher than 32V and its temperature is lower than 60°C. If either condition is not met, the battery pack is considered to be outside the preset value.

[0067] In step S200, the gear position status of the operating handle includes determining whether the operating handle is in the start gear or not by detecting the gear position signal. When it is in the start gear, the gear position detection signal is transmitted to the main controller. At this time, the gear position status of the operating handle is one of the conditions for determining whether the electro-hydraulic pump is started.

[0068] The temperature status of the electro-hydraulic pump refers to the coil temperature of the electric motor of the electro-hydraulic pump. The preset value for this temperature is 85℃. That is, when the temperature sensor measures that the coil temperature of the electric motor of the electro-hydraulic pump is greater than 85℃, it is determined that the temperature of the electro-hydraulic pump is greater than the preset value. When the temperature sensor measures that the coil temperature of the electric motor of the electro-hydraulic pump is less than 85℃, it is determined that the temperature of the electro-hydraulic pump is less than the preset value.

[0069] In step S301, when the battery pack status is outside the preset value, that is, when the battery pack temperature exceeds 60°C or the battery pack voltage is less than 32V, the electrohydraulic pump will not be turned on regardless of whether the operating handle is in the start position or not, and regardless of whether the temperature of the electrohydraulic pump is within the preset value, that is, whether the temperature of the electrohydraulic pump motor coil exceeds 85°C or does not exceed 85°C.

[0070] In step S302, when the battery pack temperature is within the preset value, that is, when the battery pack temperature is less than 60°C and its voltage is greater than 32V, the operating handle is in a position other than the start position. Regardless of whether the temperature of the electro-hydraulic pump is within the preset value, that is, whether the temperature of the electro-hydraulic pump motor coil exceeds 85°C or does not exceed 85°C, the electro-hydraulic pump will not be turned on.

[0071] In step S303, when the battery pack temperature is within the preset value, that is, when the battery pack temperature is less than 60°C and its voltage is greater than 32V, the operating handle is in the start position. The temperature of the electro-hydraulic pump is outside the preset value, that is, the temperature of the electro-hydraulic pump motor coil exceeds 85°C. At this time, the electro-hydraulic pump is not turned on.

[0072] In step S304, when the battery pack temperature is within a preset value, that is, when the battery pack temperature is less than 60°C and its voltage is greater than 32V, the operating handle is in the start position, and the temperature of the electro-hydraulic pump is within a preset value, that is, the temperature of the electro-hydraulic pump motor coil is less than 85°C, the electro-hydraulic pump is turned on.

[0073] The electrohydraulic pump will only start when all three conditions are met simultaneously: the battery pack is within the preset range (i.e., the battery pack temperature is less than 60°C and its voltage is greater than 32V), the operating handle is in the start position, and the electrohydraulic pump temperature is within the preset range (i.e., the electrohydraulic pump motor coil temperature is less than 85°C).

[0074] In one embodiment, such as Figure 3The present invention discloses a control system for an electro-hydraulic pump of an underground loader, comprising the aforementioned control method for the electro-hydraulic pump of the underground loader, and further comprising a main controller module 1, an operating handle module 3, and an electro-hydraulic pump control module 4. The main controller module 1 is electrically connected to an engine control module 2, and the engine control module 2 sends a first signal to the main controller module 1; the main controller module 1 is electrically connected to the operating handle module 3, and the operating handle module 3 sends a second signal to the active controller module 1; and the main controller module 1 is electrically connected to the electro-hydraulic pump control module 4, and the main controller module 1 sends a third signal to the electro-hydraulic pump control module 4.

[0075] Engine control module 2 sends a first signal to main controller module 1. After receiving the first signal, main controller module 1 determines its content, which refers to the engine speed. Based on the first signal, the main controller can determine whether the engine speed is zero or greater than zero. Operating handle module 3 sends a second signal to main controller module 1, indicating whether the operating handle is in the start position or not. Main controller module 1 is electrically connected to electro-hydraulic pump control module 4 and sends a third signal to the electro-hydraulic pump. The third signal controls the opening and closing of the electro-hydraulic pump solenoid valve. Upon receiving the third signal, electro-hydraulic pump control module 4 performs the operation of turning the electro-hydraulic pump on or off.

[0076] Furthermore, it also includes a battery pack control module 5, which is electrically connected to the main controller module 1. The battery pack control module 5 sends a fourth signal to the battery pack. The fourth signal includes the battery pack's voltage signal value and the battery pack's temperature signal value. It also includes an electrohydraulic pump temperature detection module 6, which is electrically connected to the main controller module 1. The electrohydraulic pump temperature detection module 6 sends a fifth signal to the main controller module 1.

[0077] The battery pack control module 5 sends a fourth signal to the main controller module 1. The fourth signal is the battery pack voltage signal and the battery pack temperature signal. The main controller module 1 determines whether the battery pack voltage signal is lower than the preset value of 32V and whether the battery pack temperature is higher than 60℃. The electrohydraulic pump temperature detection module 6 sends a fifth signal to the main controller module 1. The fifth signal is the electrohydraulic pump motor coil temperature signal. After receiving the fifth signal, the main controller module 1 determines whether the electrohydraulic pump motor coil temperature is higher than 85℃.

[0078] After receiving the first signal, the second signal, the fourth signal, and the fifth signal, the main controller module 1 determines whether to transmit the third signal to the electro-hydraulic pump control module 6 based on the information of the first signal, the second signal, the fourth signal, and the fifth signal, and then the electro-hydraulic pump control module 6 controls whether the electro-hydraulic pump is turned on.

[0079] In one embodiment, an underground loader utilizes the aforementioned control system for an electro-hydraulic pump. The underground loader further includes an electro-hydraulic pump comprising a gear pump and a motor, the gear pump being driven by the motor; a battery pack electrically connected to the motor and supplying power to the motor; and a generator electrically connected to the battery pack and charging the battery pack.

[0080] The motor output shaft is connected to the gear pump via a coupling, and the rotation of the motor drives the gear pump. The motor is powered by a battery pack, which outputs 24V to drive the motor. The battery pack is charged by a generator. The underground loader also includes an engine, which is turned on and off by a key switch. When the key switch is turned to the "on" position, the main controller activates the ignition device to start the engine. The engine provides power to both the underground loader and the generator. The engine drives the generator, which charges the battery pack. The battery pack then drives the electric motor, which in turn drives the gear pump.

[0081] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A control method for an electro-hydraulic pump in an underground loader, characterized in that: include, Get engine speed status; Determine if the key switch is in the ON position; By detecting the engine speed signal output by the engine sensor, it can be determined whether the speed is equal to zero or greater than zero; The battery pack status, electro-hydraulic pump temperature status, and operating handle position status are obtained. The operating handle position status includes determining whether the operating handle is in the start position or not by detecting the position signal. When it is in the start position, the position detection signal is transmitted to the main controller. Based on the battery pack status, the electro-hydraulic pump temperature status, and the position of the operating handle, if the battery pack status is within the preset value, the operating handle is in the correct position, and the electro-hydraulic pump temperature is less than the preset value, then the electro-hydraulic pump will be turned on. Otherwise, the electro-hydraulic pump will not start.

2. The control method for the electro-hydraulic pump of the underground loader according to claim 1, characterized in that: The method for obtaining the battery pack status, the electro-hydraulic pump temperature status, and the position of the operating handle includes: The voltage sensor is used to determine whether the voltage of the battery pack is greater than a preset value. The temperature sensor is used to determine whether the temperature of the battery pack is lower than a preset value. The temperature sensor is used to measure whether the coil temperature of the electro-hydraulic pump is greater than a preset value. By detecting the gear position signal, it can be determined whether the operating handle is in the start position or not.

3. A control system for an electro-hydraulic pump of an underground loader, comprising a control method for the electro-hydraulic pump of the underground loader as described in any one of claims 1 to 2, characterized in that: It also includes, The main controller module (1) is electrically connected to the engine control module (2), and the engine control module (2) sends a first signal to the main controller module (1). The operating handle module (3) is electrically connected to the main controller module (1), and the operating handle module (3) sends a second signal to the main controller module (1); and, Electro-hydraulic pump control module (4), the main controller module (1) is electrically connected to the electro-hydraulic pump control module (4), and the main controller module (1) sends a third signal to the electro-hydraulic pump control module (4).

4. The control system for the electro-hydraulic pump of the underground loader according to claim 3, characterized in that: It also includes a battery pack control module (5), which is electrically connected to the main controller module (1) and sends a fourth signal to the main controller module (1).

5. The control system for the electro-hydraulic pump of the underground loader according to claim 4, characterized in that: The fourth signal includes the voltage signal value of the battery pack and the temperature signal value of the battery pack.

6. The control system for the electro-hydraulic pump of the underground loader according to claim 3 or 4, characterized in that: It also includes an electro-hydraulic pump temperature detection module (6), which is electrically connected to the main controller module (1) and sends a fifth signal to the main controller module (1).

7. An underground loader, comprising a control system for the electro-hydraulic pump of any one of claims 3 to 6, characterized in that: It also includes, An electro-hydraulic pump, comprising a gear pump and a motor, wherein the gear pump is driven by the motor; A battery pack, which is electrically connected to the motor, supplies power to the motor; as well as, A generator, which is electrically connected to a battery pack, charges the battery pack.

8. The underground loader according to claim 7, characterized in that: It also includes an engine connected to the generator, which drives the generator to rotate.

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