A control system applied to a constant deceleration braking process of a mine hoist

Abstract

The utility model relates to hoist constant deceleration brake control especially relates to a kind of control system applied to mine hoist constant deceleration braking process. Including oil tank, its export is connected with first oil pump and second oil pump, the confluence export of first oil pump and second oil pump is connected with differential pressure filter switch;Main oil supply pipeline, its input end is communicated with the export of the differential pressure filter switch;Auxiliary voltage stabilizing unit is connected into the main oil supply pipeline in parallel, including two parallel branch, one two-position two-way electromagnetic valve is equipped on each branch;The export of two-position two-way electromagnetic valve one is connected energy accumulator one, and the export of two-position two-way electromagnetic valve two is connected energy accumulator two;Pressure relief control unit, its input end is communicated with the main oil supply pipeline, and output end is communicated with the oil tank by oil return pipeline. Its effective braking stability and parking precision are improved, and the continuous operation capability and overall safety of system under single-point fault are significantly enhanced.

Description

Technical Field

[0001] This utility model relates to constant deceleration braking control of hoists, and more particularly to a control system applied to the constant deceleration braking process of hoists in the mining industry. Background Technology

[0002] The constant deceleration braking control system of the hoist is an important component of the hoist system, playing a crucial role in the operation of the hoist system and even the normal operation of the entire mine.

[0003] Currently, there are still significant shortcomings in the application of technology in this field, mainly in the following two aspects: First, the system hardware architecture limits the realization of closed-loop constant deceleration braking function. Existing technical solutions typically lack precision proportional valve assemblies for dynamically adjusting braking pressure in their hydraulic circuit designs, as well as matching multi-channel redundant control valve circuits capable of rapidly responding to real-time speed and pressure signals. This hardware limitation prevents the system from constructing a fast and stable pressure closed loop, thus hindering the achievement of constant and precise control of braking deceleration.

[0004] Secondly, the system lacks redundancy in key components, and its reliability needs improvement. Existing control systems often employ a single configuration for critical hardware circuits such as hydraulic power sources (e.g., oil pumps), control valves, and electrical control units. If any of these components fails, the entire braking system faces the risk of malfunction, resulting in insufficient overall system reliability and fault tolerance. Summary of the Invention

[0005] This invention addresses the shortcomings of existing technologies by providing a control system for the constant deceleration braking process of hoists in the mining industry.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a control system applied to the constant deceleration braking process of a hoist in the mining industry, comprising: The oil tank has its outlet connected to a first oil pump and a second oil pump arranged in parallel via a pipeline. The combined outlet of the first oil pump and the second oil pump is connected to a differential pressure filter switch.

[0007] The main oil supply line has its input end connected to the outlet of the differential pressure filter switch, and the main oil supply line is connected to the oil inlets of brake A1, brake A2, brake B1 and brake B2 respectively.

[0008] An auxiliary pressure stabilizing unit is connected in parallel to the main oil supply line, including two parallel branches. Each branch is equipped with a two-position two-way solenoid valve, namely two-position two-way solenoid valve one and two-position two-way solenoid valve two. The outlet of two-position two-way solenoid valve one is connected to accumulator one, and the outlet of two-position two-way solenoid valve two is connected to accumulator two.

[0009] The pressure relief control unit has its input end connected to the main oil supply line and its output end connected to the oil tank through the return oil line.

[0010] Furthermore, the pressure relief control unit includes: The emergency pressure relief circuit consists of a two-position three-way solenoid valve one and a two-position three-way solenoid valve two connected in parallel. The constant deceleration control circuit consists of a first set of two-position three-way solenoid valves and a second set of two-position three-way solenoid valves. The first set is used to dynamically adjust the braking pressure, and the second set is used for initial conduction / isolation. The normal shutdown circuit includes a two-position two-way solenoid valve. When the two-position two-way solenoid valve is turned on, it connects the main oil supply line to the proportional valve. The PLC controls the opening of the proportional valve according to the analog signal sent by the hoist, thereby achieving controllable pressure reduction.

[0011] Furthermore, it also includes a detection and control unit, which includes a pressure transmitter one and a pressure transmitter two installed on the main oil supply pipeline, a tachogenerator installed at the hoist turntable, and a PLC electrical control device; the signal output terminals of the tachogenerator and pressure transmitters one and two are electrically connected to the PLC electrical control device, and the control output terminals of the PLC electrical control device are electrically connected to each solenoid valve and proportional valve respectively.

[0012] Furthermore, a liquid level sensor and a temperature sensor are installed on the oil tank, and both the liquid level sensor and the temperature sensor are connected to the PLC electrical control device via signal connection.

[0013] Furthermore, pressure display gauge one and pressure display gauge two are also installed in parallel on the main oil supply pipeline.

[0014] Furthermore, it also includes an uninterruptible power supply (UPS) for powering the PLC electrical control devices.

[0015] Furthermore, the PLC electrical control device integrates an Internet of Things (IoT) module, which communicates with a remote web interface for real-time data uploading and remote monitoring.

[0016] Furthermore, the main oil supply pipeline includes: The main oil supply pipe is connected at its starting end to the outlet of the differential pressure filter switch; Multiple branch manifolds are connected in parallel, and the branch manifolds branch off from different nodes of the main oil supply pipe; Along the direction of oil flow, the following components are sequentially or in parallel installed on the main oil supply pipe or the corresponding branch manifold: Pressure transmitter 1 and pressure transmitter 2 are used to detect system pressure. Pressure display gauge 1 and pressure display gauge 2 are used to visually display pressure. The oil inlet connection terminal of the auxiliary voltage stabilizing unit; And oil inlet branches leading to brakes A1, A2, B1 and B2 respectively.

[0017] Furthermore, the oil return pipeline includes a main oil collection pipe, and the oil outlets of the emergency pressure relief circuit, the constant deceleration control circuit, and the normal stop circuit are all connected in parallel to the main oil collection pipe, which is connected to the oil return port of the oil tank.

[0018] Furthermore, the PLC electrical control device adopts a redundant dual-set PLC structure.

[0019] Furthermore, the two-position three-way solenoid valve one and the two-position three-way solenoid valve two are configured in parallel with redundancy.

[0020] Compared with the prior art, this utility model has the following advantages.

[0021] This invention, by constructing a redundant and reliable hydraulic hardware architecture and a closed-loop electro-hydraulic control system, not only achieves high-precision constant deceleration braking based on real-time speed and pressure feedback, effectively improving braking smoothness and stopping accuracy, but also significantly enhances the system's continuous operation capability and overall safety under single-point failure through multiple redundant designs such as dual oil pumps, parallel valve circuits, dual PLCs, and uninterruptible power supplies. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The scope of protection of the present invention is not limited to the following description.

[0023] Figure 1 A block diagram illustrating the working principle of the constant deceleration braking control system for the engine.

[0024] Figure 2 Flowchart for improving the working mode of the constant deceleration braking control system.

[0025] In the diagram, 1 is accumulator one, 2 is accumulator two, 3 is pressure transmitter one, 4 is pressure transmitter two, 5 is brake A1, 6 is brake A2, 7 is brake B1, 8 is brake B2, 9 is two-position two-way solenoid valve one, 10 is two-position two-way solenoid valve two, 11 is two-position three-way solenoid valve one, 12 is two-position three-way solenoid valve two, 13 is two-position three-way solenoid valve three, 14 is two-position three-way solenoid valve four, and 15 is two-position three-way solenoid valve. 5. 16 is a two-position three-way solenoid valve. 6. 17 is a proportional valve. 7. 18 is a two-position two-way solenoid valve. 8. 19 is a two-position three-way solenoid valve. 9. 20 is a two-position three-way solenoid valve. 10. 21 is a differential pressure filter switch. 11 is the first oil pump. 12 is the second oil pump. 13 is the oil tank. 14 is the liquid level sensor. 15 is the temperature sensor. 16 is the PLC electrical control device. 17 is the UPS power supply. 18 is the pressure display gauge. 19 is the pressure display gauge. 10 is the pressure display gauge. 11 is the pressure display gauge. Detailed Implementation

[0026] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0027] The terminology used in the embodiments of this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The singular forms “a,” “the,” and “the” as used in the embodiments of this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0028] Depending on the context, words such as “if” or “suppose” used here can be interpreted as “when”, “in response to determination”, or “in response to detection”.

[0029] For ease of understanding, the embodiments of this disclosure will be described in detail first.

[0030] like Figure 1-2 As shown, the hoist constant deceleration braking control system is divided into five parts according to different functions: The first part consists of an oil tank 24, a first oil pump 22, a second oil pump 23, a pressure display gauge 1 30, a pressure display gauge 2 31, and a differential pressure filter switch 21. Its main function is to fill the system with oil after the control system is started and before receiving a braking signal, raising the pressure to a predetermined value so that the brake is fully released.

[0031] Part Two: Composed of accumulator 1 and accumulator 2, two-position two-way solenoid valve 9 and two-position two-way solenoid valve 10, and pressure transmitters 3 and 4. Its main function is: the PLC controls the on / off state of the two-position two-way solenoid valves (9 and 10) based on pressure feedback, enabling the accumulators to provide secondary pressurization or pressure replenishment to the pipeline.

[0032] Part Three: Composed of brakes A15, A26, B17, B28, the first group of two-position three-way solenoid valves (13, 14, 15, 16), the second group of two-position three-way solenoid valves (19, 20), pressure transmitters 3 and 4, and PLC electrical control device 27. Its main function is to adjust the pressure to achieve constant deceleration by controlling the opening and closing of these solenoid valves after receiving a constant deceleration signal.

[0033] Part Four: Composed of proportional valve 17 and two-position two-way solenoid valve 18. Its main function is: upon receiving a normal stop signal, the PLC controls the two-position two-way solenoid valve 18 to open, and adjusts the opening of proportional valve 17 according to the analog signal.

[0034] Part 5: Composed of two two-position three-way solenoid valves 11 and 12. Its main function is to instantly shut off two two-position three-way solenoid valves 11 and 12 upon receiving an emergency stop signal, allowing the oil to flow back to the oil tank 24 rapidly, and the brake to reach its maximum clamping force.

[0035] Combination Figure 2 The function of the control system during the braking process and the operating mechanisms of each loop are explained: After the system starts, the PLC program detects the input signals to check for faults and alarms, including whether the oil temperature is abnormal, whether the liquid level meets the requirements, whether there is a pressure difference in the filter, whether there is an alarm signal in the brake, etc. If there are no errors, the oil pump is started. The first oil pump is the main starter, and the second oil pump is the backup. If the first oil pump fails, the second oil pump will be automatically switched to start.

[0036] The oil pump draws oil from the oil tank into the pipeline. After the control system pressure reaches the predetermined value, the oil pump stops running. The pressure transmitter feeds back the pressure signal to the PLC program to detect whether the control system pressure can remain stable. If the pressure drops after reaching the predetermined value, the two-position two-way solenoid valves one and two before the accumulators one and two are closed to replenish the oil in the accumulator into the pipeline and maintain constant pressure. Then, the two-position two-way solenoid valves one and two are opened and closed, and the accumulator is closed again. At this time, the brake is in a fully open state and no clamping force is generated. When the control system does not receive a braking signal, positions three, four, five, and six of the two-position three-way solenoid valves are in the closed (cut-off) state to maintain pipeline pressure. Positions one, two, seven, and eight of the two-position three-way solenoid valves are in the closed state. If the control system receives a first-level braking signal at this time, it will instantly switch the two-position three-way solenoid valves to state one and two. Due to the pressure difference, the oil in the pipeline will quickly flow back to the oil tank. During this process, the brake will generate a clamping force to apply emergency braking to the turntable, quickly reducing the turntable speed until it stops completely.

[0037] In the second scenario, the control system receives a normal stop signal. The PLC controls the activation of the two-position two-way solenoid valve three, and then controls the opening of the proportional valve according to the analog current signal sent by the hoist system to ensure that the pressure in the pipeline continues to decrease in a controllable manner and the pressure changes gradually during the oil return process. The two-position two-way solenoid valve three is located above the proportional valve. After the two-position two-way solenoid valve three is activated, the proportional valve is adjusted according to the current signal.

[0038] In the third scenario, the control system receives a constant deceleration braking signal. The PLC program first activates the two-position three-way solenoid valves (positions 3, 4, 5, 6, 7, and 8). Upon activation, the pressure drops instantly, generating clamping force in the brake. Simultaneously, the speed signal fed back from the tachometer generator is converted and applied in the program. The deceleration is calculated based on the speed signal acquisition cycle, and the calculated deceleration value is compared with the theoretical value. Based on the comparison result, the two-position three-way solenoid valves (positions 3, 4, 5, and 6) are controlled to open / close. If the calculated value is greater than the theoretical value, it indicates that the clamping force is too large, and the program controls the valve to close. After closure, the speed decreases, and the deceleration value decreases. When the deceleration value is lower than the predetermined theoretical value, it indicates that the clamping force is too small, and the program controls the valve to open. After opening, the speed change value increases, and the valve is closed again. This process is repeated. By controlling the valves, rapid pressure changes are achieved, thus dynamically maintaining a constant deceleration within the reasonable error range of the theoretical value, achieving the purpose of constant deceleration braking.

[0039] Further explanation of the constant deceleration braking process: After receiving the constant deceleration braking signal, the PLC electrical control device records the initial speed of the turntable and simultaneously opens the corresponding two-position three-way solenoid valve. After opening, the oil in the pipeline returns to the oil tank, and the pressure changes, resulting in an increase in the clamping force of the brake and a decrease in the speed of the turntable. During this process, the program compares and calculates the speed signal collected in real time. According to the formula: a=Δv / t, that is, the deceleration is equal to the speed variable / change time, the calculated deceleration is compared with the predetermined theoretical deceleration, and the program controls the corresponding valve according to the calculation result.

[0040] Working principle of the control system: After a braking signal is generated, the control system dynamically adjusts the pressure in the hydraulic brake through the solenoid valve based on the real-time feedback speed simulation signal from the tachogenerator, thereby changing the clamping torque of the brake. Different control methods are adopted for the solenoid valve according to different braking signals, and finally, reliable braking of the hoist system is achieved by controlling the oil pressure.

[0041] Control system operating conditions: 1. First-level braking: In this operating mode, the oil in the pipeline needs to be drained in the shortest possible time, the brake completes the holding action, and clamps the hoist system turntable. Therefore, after the braking system receives an emergency braking signal from the hoist system, it instantly opens the two-position three-way solenoid valves one and two to drain the oil in the pipeline in the shortest possible time, and the brake instantly engages, reaching maximum clamping force; 2. Constant deceleration braking: In this process, the control system controls the hoist system's brake disc to achieve the purpose of the hoist system moving at a constant deceleration, with uniform speed changes. The braking system receives an emergency braking signal from the hoist system... After receiving the constant deceleration braking signal, the electrical control device performs a single control of the solenoid valve based on the real-time feedback speed, calculates the system deceleration, compares it with the theoretical value of deceleration according to the program, and dynamically adjusts the system pressure to achieve constant deceleration; 3. Normal stop: At this time, the hoist system has completed most of the braking process. After receiving the normal stop signal from the hoist system, the PLC electrical control device starts the proportional control circuit. At this time, the hoist system is at the end of the braking process. The opening degree of the solenoid valve is controlled according to the current proportional signal, thereby realizing oil pressure control and achieving the purpose of stable system stop.

[0042] This utility model incorporates multiple redundant designs; the two-position three-way solenoid valves have the same functions in positions one and two, the same functions in positions three, four, five, and six, and the same functions in positions seven and eight. This redundant design of the solenoid valves and pipelines avoids system shutdowns or major accidents caused by blockages or solenoid valve malfunctions in a single circuit. The PLC electrical control device uses redundant dual PLCs, allowing for immediate switching in case of hardware problems. This ensures more effective control of the input and output signals of the hoisting braking system, efficient calculation and execution of instructions, and guaranteed system reliability. The two sets of oil pumps serve as backups for each other, with the program monitoring fault signals and switching between them as needed.

[0043] Compared with traditional hoist braking systems, this utility model only has two braking modes: single-stage braking and conventional stopping. It does not have a constant deceleration braking mode. Constant deceleration braking makes the operating state of the hoist system during the braking process controllable, ensuring stable system operation, greatly reducing work risks and failure rates, and effectively improving the service life of the system.

[0044] Precision control and remote data monitoring of PLC electrical control devices. The use of precision PLCs and data transmission modules in these devices ensures accurate and efficient data transmission, analysis, and processing, enabling real-time and rapid response of the control system's actions. The addition of an IoT module allows for remote online communication with the PLC electrical control device via a web interface, enabling real-time data reading. This facilitates real-time monitoring of various system status variables by management personnel and allows for analysis of historical data to help determine system operating conditions, lifespan, and other relevant parameters, further enhancing system safety.

[0045] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "preferred embodiment," "detailed description," or "preferred embodiment," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Therefore, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope defined by the claims of this utility model.

Claims

1. A control system for the constant deceleration braking process of a hoist in the mining industry, characterized in that, include: The oil tank (24) has its outlet connected to a first oil pump (22) and a second oil pump (23) arranged in parallel via a pipeline. The combined outlet of the first oil pump (22) and the second oil pump (23) is connected to a differential pressure filter switch (21). The main oil supply line has its input end connected to the outlet of the differential pressure filter switch (21), and the main oil supply line is connected to the oil inlet of brake A1 (5), brake A2 (6), brake B1 (7) and brake B2 (8) respectively. The auxiliary pressure stabilizing unit is connected in parallel to the main oil supply pipeline, including two parallel branches. Each branch is equipped with a two-position two-way solenoid valve, namely two-position two-way solenoid valve one (9) and two-position two-way solenoid valve two (10). The outlet of the two-position two-way solenoid valve 1 (9) is connected to accumulator 1 (1), and the outlet of the two-position two-way solenoid valve 2 (10) is connected to accumulator 2 (2). The pressure relief control unit has its input end connected to the main oil supply line and its output end connected to the oil tank (24) through the return oil line.

2. The control system according to claim 1, characterized in that, The pressure relief control unit includes: The emergency pressure relief circuit consists of a two-position three-way solenoid valve one (11) and a two-position three-way solenoid valve two (12) connected in parallel; The constant deceleration control circuit consists of a first set of two-position three-way solenoid valves (13, 14, 15, 16) and a second set of two-position three-way solenoid valves (19, 20). The first set is used to dynamically adjust the braking pressure, and the second set is used for initial conduction / isolation. The normal parking circuit includes a two-position two-way solenoid valve three (18). After the two-position two-way solenoid valve three (18) is turned on, the main oil supply line is connected to the proportional valve (17). The PLC controls the opening of the proportional valve according to the analog signal sent by the hoist, so as to realize controllable pressure reduction.

3. The control system according to claim 1 or 2, characterized in that, It also includes a detection and control unit, which includes a pressure transmitter (3) and a pressure transmitter (4) installed on the main oil supply pipeline, a tachogenerator installed at the hoist turntable, and a PLC electrical control device (27); the signal output terminals of the tachogenerator and the pressure transmitters are electrically connected to the PLC electrical control device (27), and the control output terminals of the PLC electrical control device (27) are electrically connected to each solenoid valve and proportional valve respectively.

4. The control system according to claim 3, characterized in that, The oil tank (24) is equipped with a liquid level sensor (25) and a temperature sensor (26), both of which are connected to the PLC electrical control device (27) via signal connection.

5. The control system according to claim 1, characterized in that, Pressure display gauge 1 (30) and pressure display gauge 2 (31) are also installed in parallel on the main oil supply pipeline.

6. The control system according to claim 3, characterized in that, It also includes an uninterruptible power supply (UPS) (29) that supplies power to the PLC electrical control unit (27).

7. The control system according to claim 3, characterized in that, The PLC electrical control device (27) integrates an Internet of Things (IoT) module, which is connected to a remote web interface for real-time data uploading and remote monitoring.

8. The control system according to claim 3, characterized in that, The PLC electrical control device (27) adopts a redundant dual-set PLC structure.

9. The control system according to claim 2, characterized in that, The two-position three-way solenoid valve one (11) and the two-position three-way solenoid valve two (12) are configured in parallel with redundancy.

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