Auxiliary braking system of steep seam mining machine braking system

Abstract

The utility model provides an auxiliary braking system of steeply inclined coal seam coal winning machine braking system, and the braking system includes proportional valve group, brake valve group, and the auxiliary braking system includes: energy storage ware, hydraulic line is connected between proportional valve group and brake valve group on the hydraulic line, is used to store the hydraulic oil that can supply hydraulic brake to open to stabilize system pressure, pressure detection part is set up on the hydraulic line, is used to detect the working pressure of brake circuit, and sends the brake release confirmation signal to the main control system when pressure reaches the preset threshold value, and the main control system controls the traction motor of coal winning machine to switch from the pre -tightening torque that prevents coal winning machine to slide before brake release to establish normal traction working condition fast according to brake release confirmation signal. The oil liquid is stored through the energy storage ware to ensure opening the brake, and the brake working time is controllable through the pressure detection part, is favorable to the matching between the establishment of traction motor torque and brake opening, improves the effectiveness and reliability of braking.

Description

Technical Field

[0001] This utility model belongs to the field of coal mining machine technology, specifically relating to an auxiliary braking system for a braking system of a steeply inclined coal seam mining machine. Background Technology

[0002] Steeply inclined coal seams with an angle of dip greater than 45° are distributed in mining areas of Sichuan, Guizhou, and Xinjiang in my country. According to statistics, steeply inclined coal seams account for 15% to 20% of the country's total coal reserves. Due to factors such as large changes in mine pressure, high ventilation difficulty, poor working face stability, and high safety risks, steeply inclined coal seams generally have a low degree of mechanization and low output.

[0003] When a coal mining machine stops at a steep working face, it will slide down due to its own weight, thus requiring a mechanical brake. When the coal mining machine begins to move forward at the steep working face, the frequency converter must ensure sufficient torque to prevent the machine from slipping when releasing the brake. The specific coordination between the four-quadrant frequency converter and the mechanical hydraulic brake is as follows: When the coal mining machine needs to move upward, the frequency converter needs to control the traction motor to build up torque. Once the torque is built up, the brake is released. At this point, the following situation may occur, which could be dangerous: (1) If the brake is released too early, the traction motor torque has not yet been fully established, and the coal mining machine will slip. (2) If the brake is released too late, the traction motor will start, the resistance will be high, and the brake will generate heat due to friction. Over time, this will easily lead to damage. (3) After the brake valve group receives the signal, the brake cannot be opened and the coal mining machine cannot move normally; (4) The existing brake system directly connects the brake valve assembly to the brake. Due to the pressure loss and oil leakage caused by the short pipeline length, it is impossible to guarantee that there is enough oil to open the brake.

[0004] Therefore, there is an urgent need for a braking system that can ensure safe and reliable braking for mining machines in steeply inclined coal seams. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing an auxiliary braking system for the braking system of a steeply inclined coal seam mining machine that can effectively prevent runaway and improve braking reliability.

[0006] This utility model provides an auxiliary braking system for a steeply inclined coal seam mining machine braking system. The braking system includes a proportional valve group for regulating the flow of the coal mining machine's hydraulic system and a brake valve group for controlling the activation or deactivation of the hydraulic brake. The proportional valve group and the brake valve group are controlled by the main control system of the coal mining machine. The auxiliary braking system includes: An energy storage device is connected via a pipeline to the hydraulic pipeline between the proportional valve group and the brake valve group, and is used to store hydraulic oil that can be used to open the hydraulic brake in order to stabilize the system pressure. A pressure detection component, installed on the hydraulic pipeline, is used to detect the working pressure of the braking circuit and send a release confirmation signal to the main control system when the pressure reaches a preset threshold. The main control system controls the traction motor of the coal mining machine to quickly switch from the pre-tightening torque established before the hydraulic brake is released to prevent the coal mining machine from sliding down to the normal traction working state according to the release confirmation signal.

[0007] Preferably, the auxiliary braking system of the steeply inclined coal seam mining machine braking system further includes a one-way valve, which is installed on the hydraulic pipeline between the proportional valve group and the accumulator to prevent hydraulic oil backflow.

[0008] Preferably, the energy storage device has only one inlet and outlet connected between the check valve and the brake valve assembly to regulate the pressure of the hydraulic circuit.

[0009] Preferably, the auxiliary braking system of the steeply inclined coal seam mining machine braking system further includes a first three-way connector, wherein the first end of the first three-way connector is connected to the oil outlet of the one-way valve, the second end is connected to the inlet and outlet of the energy storage device, and the third end is connected to the oil inlet of the brake valve assembly.

[0010] Preferably, the auxiliary braking system of the steeply inclined coal seam mining machine braking system further includes an oil circuit status detection component, which is installed on the hydraulic pipeline between the first three-way connector and the brake valve group, for detecting whether there is oil in the pipeline.

[0011] Preferably, the oil circuit status detection component includes a shut-off valve connected between the first tee joint and the brake valve assembly via a second tee joint, and an oil supply pipe connected to the outside via a pipeline from the oil outlet of the shut-off valve.

[0012] Preferably, the pressure detection component is a combined back pressure sensor, which is fixed to the connection point of the brake valve assembly and the brake solenoid valve by a hinge seat and hinge bolts.

[0013] Preferably, the auxiliary braking system of the steeply inclined coal seam mining machine braking system further includes a body tilt angle sensor. The body tilt angle sensor is used to detect the tilt angle information of the working face where the mining machine is located in real time and send it to the main control system. The main control system controls the working state of the traction motor and the hydraulic brake according to the tilt angle information.

[0014] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.

[0015] The positive and progressive effects of this utility model are as follows: According to the auxiliary braking system of the steeply inclined coal seam mining machine braking system involved in this utility model, an energy accumulator is added between the existing proportional valve group and brake valve group of the mining machine to store or release oil, ensuring the stability of the low-pressure system and ensuring that there is enough oil to open the brake valve group and the related hydraulic brakes, thereby improving the effectiveness and reliability of braking. In addition, the working pressure of the braking circuit is detected by a pressure detection component, and a release confirmation signal is issued when the pressure reaches a preset threshold, making the working time of the solenoid valve connected to the hydraulic brake controllable. This facilitates the rapid switching of the traction motor to the normal working state, which is beneficial to the matching between the establishment of the traction motor torque and the opening of the hydraulic brake, further improving the effectiveness and reliability of braking and preventing the mining machine from slipping in steeply inclined coal seams. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the auxiliary braking system of the braking system of the steeply inclined coal seam mining machine in an embodiment of this utility model.

[0017] Figure 2 This is a schematic diagram of the structure of the combined back pressure sensor in an embodiment of this utility model. Detailed Implementation

[0018] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings. Example

[0019] As attached Figure 1 As shown, this embodiment discloses an auxiliary braking system 100 for a steeply inclined coal seam mining machine braking system. The braking system includes a proportional valve group 210 for regulating the flow of the hydraulic system of the mining machine and a brake valve group 220 for controlling the start or stop of the hydraulic brake (not shown in the figure). The proportional valve group 210 and the brake valve group 220 are controlled by the main control system of the mining machine (not shown in the figure).

[0020] It should be noted that in the existing technology, under normal working conditions in a steeply inclined coal seam, the main control system controls the traction motor and hydraulic brake of the coal mining machine to perform the following operations: The main control system responds to the traction start command by sending speed and direction commands to the frequency converter of the traction motor. After receiving the traction start command, the frequency converter first outputs a preset preload torque to the traction motor to establish a preload torque to resist the downward movement of the coal mining machine. After the preload torque is established, it sends a feedback signal to the main control system. After receiving the torque establishment feedback signal, the main control system sends a release command to the brake solenoid valve of the brake valve group and controls the traction motor to run in normal working condition.

[0021] However, in the actual application of the above braking system, the following problems often occur: it is impossible to ensure that the hydraulic brake is fully opened, or the release time of the hydraulic brake is uncontrollable, which can easily lead to malfunctions such as the coal mining machine slipping or the coal mining machine being unable to move normally.

[0022] In response to the above problems, such as Figure 1 As shown, the auxiliary braking system 100 of this embodiment includes an energy storage device 101 and a pressure detection component 102.

[0023] The accumulator 101 is connected to the hydraulic line between the proportional valve group 210 and the brake valve group 220 via a pipeline, and is used to store hydraulic oil that can be used to open the hydraulic brake in order to stabilize the system pressure.

[0024] The pressure detection component 102 is installed on the hydraulic pipeline to detect the working pressure of the braking circuit and sends a brake release confirmation signal to the main control system when the pressure reaches a preset threshold. This allows the main control system to quickly switch the traction motor of the coal mining machine from the pre-tensioning torque established before the hydraulic brake is released to prevent the coal mining machine from sliding down to the normal traction working state.

[0025] In this embodiment, an energy accumulator is added between the existing proportional valve group and brake valve group of the coal mining machine to store or release oil, ensuring the stability of the low-pressure system and guaranteeing sufficient oil for opening the brake valve group and related hydraulic brakes, thereby improving braking effectiveness and reliability. Furthermore, a pressure detection component monitors the working pressure of the brake circuit and issues a release confirmation signal when the pressure reaches a preset threshold. This makes the working time of the solenoid valve connected to the hydraulic brake controllable, facilitating the rapid switching of the traction motor to its normal operating frequency. This improves the matching between the establishment of the traction motor's preload torque and the opening of the hydraulic brake, further enhancing braking effectiveness and reliability and preventing the coal mining machine from slipping in steeply inclined coal seams.

[0026] In a specific implementation, the pressure detection component can directly detect the hydraulic line pressure to determine the pressure magnitude and whether to issue a brake release confirmation signal, or it can detect the pressure within the brake solenoid valve of the brake valve assembly. In a preferred embodiment, such as... Figure 2 As shown, the pressure detection component 102 is a combined back pressure sensor, which is equipped with a transition joint 1, a U-shaped clip 2, a hinge seat 3, a hinge bolt 4, and a washer 5. It is fixed to the connection point of the brake valve assembly 220 and the brake solenoid valve 221 by the hinge seat 3 and the hinge bolt 4. The installation is simple and convenient, and no additional installation structure is required.

[0027] In another embodiment, the auxiliary braking system 100 further includes a one-way valve 103, which is disposed on the hydraulic line between the proportional valve group 210 and the accumulator 101 to prevent hydraulic oil backflow.

[0028] In one specific embodiment, the energy storage device 101 may be configured to have only one inlet and outlet, and be connected between the check valve 103 and the brake valve assembly 220 to regulate the pressure of the hydraulic circuit.

[0029] Specifically, the auxiliary braking system 100 also includes a first three-way connector 104, the first end of which is connected to the oil outlet of the one-way valve 103, the second end of which is connected to the inlet and outlet of the accumulator 101, and the third end of which is connected to the oil inlet of the brake valve assembly 220.

[0030] Based on this structure, when the hydraulic circuit system pressure is too low, the accumulator 101 receives oil through the first and second ends of the first three-way connector 104 and its own inlet and outlet. When the hydraulic circuit system pressure is too high, the accumulator 101 discharges oil through the second and third ends of the first three-way connector 104 and its own inlet and outlet, thereby supplying oil to the brake valve assembly 220, thus stabilizing the hydraulic system pressure and ensuring that the hydraulic oil quantity and pressure are sufficient to open the hydraulic brake.

[0031] In another embodiment, the auxiliary braking system 100 further includes an oil circuit status detection component, which is disposed on the hydraulic pipeline between the first tee connector 104 and the brake valve assembly 220, for detecting whether there is oil in the pipeline.

[0032] Specifically, the oil circuit status detection component includes a shut-off valve 106 connected between the first three-way connector 104 and the brake valve assembly 220 via a second three-way connector 105, and an oil supply pipe connected to the outside via a pipeline from the oil outlet of the shut-off valve 106. Thus, in maintenance or other situations, the presence or absence of hydraulic oil in the brake circuit can be observed by manually opening the shut-off valve 106.

[0033] In another embodiment, the auxiliary braking system 100 further includes a body tilt sensor 107. The body tilt sensor 107 is used to detect the tilt angle information of the working face where the coal mining machine is located in real time and send it to the main control system. The main control system controls the working state of the traction motor and the hydraulic brake according to the tilt angle information. Specifically: when the tilt angle of the working face is ≦15°, the hydraulic brake can be directly opened without coordination with the movement of the traction motor; when the tilt angle of the working face is >15°, the hydraulic brake needs to coordinate with the movement of the traction motor. In this way, based on the tilt angle information collected by the body tilt sensor 107, the main control system can control the working state of the traction motor and the hydraulic brake to ensure that the coal mining machine can move normally and will not slip.

[0034] In summary, this embodiment uses an energy storage device, a one-way valve, and a pressure detection component as an auxiliary braking system. On the one hand, it ensures that the hydraulic brake has a sufficient supply of hydraulic oil to fully open. On the other hand, the pressure information detected by the pressure detection component determines whether to issue a brake release confirmation message, ensuring that the main control system can issue a brake release command only after the pre-tensioning torque of the traction motor has been established. This ensures the gap between the release of the hydraulic brake and the movement command of the coal mining machine, achieving precise control and ensuring that the coal mining machine can move normally after the brake is released, avoiding slippage and runaway.

[0035] exist Figure 1 In the process, the pressure detection component 102, the body tilt sensor 107, the brake solenoid valve 221, and the proportional solenoid valve of the proportional valve group 210 are respectively connected to the main control system of the coal mining machine through corresponding communication lines, such as communication line 1, communication line 2, and communication line 3, to facilitate signal transmission and command reception.

[0036] In addition, the proportional valve group 210, the check valve 103, the first three-way connector 104, the second three-way connector 105 and the brake valve group 220 are connected by hoses, such as hose 1, hose 2, hose 3 and hose 4.

[0037] The scope of protection of this utility model is not limited to the above-described embodiments. Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its scope and spirit. If these modifications and variations fall within the scope of the claims of this utility model and their equivalents, then the intent of this utility model also includes these modifications and variations.

Claims

1. An auxiliary braking system for a steeply inclined coal seam mining machine braking system, the braking system comprising a proportional valve group for regulating the flow rate of the mining machine's hydraulic system, and a braking valve group for controlling the activation or deactivation of the hydraulic brakes, wherein the proportional valve group and the braking valve group are controlled by the mining machine's main control system, characterized in that... The auxiliary braking system includes: An energy storage device is connected via a pipeline to the hydraulic pipeline between the proportional valve group and the brake valve group, and is used to store hydraulic oil that can be used to open the hydraulic brake in order to stabilize the system pressure. A pressure detection component, installed on the hydraulic pipeline, is used to detect the working pressure of the braking circuit and send a release confirmation signal to the main control system when the pressure reaches a preset threshold. The main control system controls the traction motor of the coal mining machine to quickly switch from the pre-tightening torque established before the hydraulic brake is released to prevent the coal mining machine from sliding down to the normal traction working state according to the release confirmation signal.

2. The auxiliary braking system of the braking system for steeply inclined coal seam mining machines according to claim 1, characterized in that, It also includes a one-way valve, which is installed on the hydraulic line between the proportional valve group and the accumulator to prevent hydraulic oil backflow.

3. The auxiliary braking system of the braking system for steeply inclined coal seam mining machines according to claim 2, characterized in that, The energy storage device has only one inlet and outlet and is connected between the check valve and the brake valve assembly to regulate the pressure of the hydraulic circuit.

4. The auxiliary braking system of the braking system for steeply inclined coal seam mining machines according to claim 3, characterized in that, It also includes a first tee connector, wherein the first end of the first tee connector is connected to the oil outlet of the one-way valve, the second end is connected to the inlet and outlet of the energy accumulator, and the third end is connected to the oil inlet of the brake valve assembly.

5. The auxiliary braking system of the braking system for steeply inclined coal seam mining machines according to claim 4, characterized in that, It also includes an oil circuit status detection component, which is installed on the hydraulic pipeline between the first three-way connector and the brake valve assembly, and is used to detect whether there is oil in the pipeline.

6. The auxiliary braking system of the braking system for steeply inclined coal seam mining machines according to claim 5, characterized in that, The oil circuit status detection component includes a shut-off valve connected between the first tee joint and the brake valve assembly via a second tee joint, and an oil supply pipe connected to the outside via a pipeline from the oil outlet of the shut-off valve.

7. The auxiliary braking system of the braking system for steeply inclined coal seam mining machines according to claim 1, characterized in that, The pressure detection component is a combined back pressure sensor, which is fixed to the connection point of the brake valve assembly and the brake solenoid valve by a hinge seat and hinge bolts.

8. The auxiliary braking system of the braking system for a steeply inclined coal seam mining machine according to any one of claims 1 to 7, characterized in that, It also includes a body tilt sensor, which is used to detect the tilt angle information of the working face where the coal mining machine is located in real time and send it to the main control system. The main control system controls the working status of the traction motor and the hydraulic brake according to the tilt angle information.

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