Automatic parking device for explosion-proof trackless rubber-tired mining vehicles

Abstract

This invention provides an automatic parking device for a mine explosion-proof trackless rubber-tired vehicle, comprising an accumulator, a parking brake valve, a parking brake, and an oil tank. It also includes an electromagnetic directional valve connected in series with the parking brake valve and the parking brake to achieve automatic parking under set conditions; a rotary valve connected to the electromagnetic directional valve and the parking brake valve as a selector switch for enabling / disabling the automatic parking function; a voltage regulator for detecting the presence / absence of generator output voltage; a driveshaft speed detection mechanism for detecting the driveshaft speed; a jog switch for sending an electrical signal indicating the vehicle is ready to start; and an electrical control box for receiving, processing, and sending corresponding control signals to the electromagnetic directional valve from the voltage regulator, driveshaft speed detection mechanism, and jog switch. This invention, while retaining the existing manual parking function, achieves automatic parking, solving the safety hazards of vehicle slippage and lurching in existing technologies, and reducing the occurrence of safety accidents.

Description

Technical Field

[0001] This invention relates to the field of components for explosion-proof trackless rubber-tired vehicles used in mining, and specifically to an automatic parking device for explosion-proof trackless rubber-tired vehicles used in mining. Background Technology

[0002] The engine power of the explosion-proof trackless rubber-tired vehicle in the coal mine drives the wheels through a drive system including the drive shaft 11 and drive axles (including the front and rear axles), enabling the vehicle to move. The vehicle's parking brake is applied to the wheel hubs. The existing parking brake device for the explosion-proof trackless rubber-tired vehicle in the coal mine (see [reference]). Figure 1 The parking brake system mainly consists of an accumulator 1, a parking brake valve 2, a parking brake 3, and related fluid lines. The parking brake 3 is generally a fail-safe brake with a spring-loaded, hydraulically released braking mechanism. When the handle of the parking brake valve 2 is in the released position, the pressurized oil supplied by the accumulator 1 acts on the piston of the hydraulic cylinder of the parking brake 3, compressing the spring of the parking brake 3 and releasing the spring force applied to the friction pads (brake pads) of the parking brake 3, thus releasing the brake. After parking, when the handle of the parking brake valve 2 is placed in the brake position, the pressurized oil in the parking brake 3 returns to the oil tank, and the friction pads of the parking brake 4 grip the wheel hub under the action of the spring's return elastic force, thus braking the vehicle. As can be seen from the foregoing, the existing automatic parking device for explosion-proof trackless rubber-tired vehicles in mining requires the driver to manually operate the parking brake valve 2 to engage the brake position when parking is needed. This presents several problems: First, the parking brake relies entirely on the driver's manual operation. If the driver forgets to engage the parking brake valve 2 (commonly known as forgetting to apply the handbrake) after parking, the vehicle is at risk, especially when parked on a slope that is difficult for the driver to see. There is a significant risk of the vehicle rolling away. In fact, serious accidents caused by vehicles rolling away due to forgotten braking are common in underground coal mines. Second, if the parking brake is not engaged when parking, the vehicle may suddenly lurch forward upon restarting, potentially causing an accident. Summary of the Invention

[0003] The purpose of this invention is to provide an automatic parking device for explosion-proof trackless rubber-tired vehicles used in mines, which solves the safety hazards of slippage and lurching caused by existing parking brake devices for explosion-proof trackless rubber-tired vehicles in coal mines, improves vehicle safety performance, and avoids safety accidents caused by slippage and lurching of explosion-proof trackless rubber-tired vehicles.

[0004] The technical solution of the present invention is as follows: The automatic parking device for explosion-proof trackless rubber-tired vehicles of the present invention includes a hydraulic power source accumulator, a parking brake valve connected to the accumulator for manual operation by the driver to realize parking braking and release braking, a parking brake for braking and releasing the wheels, and an oil tank for oil return. Its structural features are: it also includes an electromagnetic reversing valve connected in series between the parking brake valve and the parking brake for realizing automatic parking of the explosion-proof trackless rubber-tired vehicle under set conditions, a rotary valve connected to the electromagnetic reversing valve and the parking brake valve as a selection switch for enabling or disabling the automatic parking function, a voltage regulator for detecting the presence / absence of output voltage of the generator of the explosion-proof trackless rubber-tired vehicle, a drive shaft speed detection mechanism for detecting the speed of the drive shaft of the explosion-proof trackless rubber-tired vehicle, a jog switch for sending an electrical signal indicating that the vehicle is ready to start when the driver is ready to start the vehicle, and an electrical control box for receiving signals sent by the voltage regulator, the drive shaft speed detection mechanism, and the jog switch, processing them, and sending corresponding control signals to the electromagnetic reversing valve.

[0005] A further solution is as follows: the parking brake valve has an oil inlet P, an oil return port T, and working ports A and B. The parking brake valve is connected to the accumulator via its oil inlet P and to the oil tank via its oil return port T.

[0006] A further solution is as follows: the solenoid directional valve has an inlet port P, a return port T, working ports A and B, and an electrical control terminal K; the rotary valve has an inlet port P and working ports A and B; the solenoid directional valve is fluid-connected to the hydraulic cylinder of the parking brake via its working port B; the inlet port P of the rotary valve is fluid-connected to the return port T of the solenoid directional valve, the working port A of the rotary valve is fluid-connected to the oil tank, and the working port B of the rotary valve, the inlet port of the solenoid directional valve, and the working port B of the parking brake valve are fluid-connected to each other; the solenoid directional valve is electrically connected to the electrical control box via its electrical control terminal K.

[0007] A further solution is as follows: The aforementioned transmission shaft speed detection mechanism includes a gear ring and a speed element. The gear ring is an integrally circular structure with several outwardly protruding teeth evenly spaced on its outer circumference. The gear ring is fixed on the transmission shaft and can rotate synchronously with the transmission shaft. The speed element is fixed nearby on the explosion-proof trackless rubber-wheeled vehicle in a manner that faces the front of the gear ring.

[0008] A further proposed solution is to have 16 teeth on the aforementioned gear ring.

[0009] A further solution is to provide two sets of the aforementioned drive shaft speed detection mechanism with identical structures, one set being located near the front axle of the explosion-proof trackless rubber-tired vehicle, and the other set being located near the rear axle of the explosion-proof trackless rubber-tired vehicle.

[0010] The present invention has the following positive effects: (1) The automatic parking device of the present invention, through the improved design of the overall structure, enables the vehicle to automatically brake and park when it is parked or turned off. After the parking brake is applied, the driver must manually release the brake before the vehicle can move when it is started again. This effectively solves the problem of vehicle slippage caused by the driver forgetting to manually brake and the problem of vehicle lurching out when starting the vehicle, which are common in the prior art. This avoids the safety accidents caused by these two problems and greatly improves the safety of driving and operating the explosion-proof trackless rubber-tired vehicle in the coal mine. (2) The automatic parking device of the present invention, through the design of the overall structure, still retains the function of the manual parking brake device in the prior art. The switching between manual parking and automatic parking functions only requires the driver to operate with a "one-button" operation, which can effectively meet the individual needs of different drivers. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the present invention, which also schematically shows the related transmission shaft and drive axle;

[0012] Figure 2 for Figure 1 A schematic diagram of a type of gear ring.

[0013] The reference numerals in the above figures are as follows:

[0014] Accumulator 1; Parking brake valve 2; Parking brake 3; Electromagnetic directional valve 4; Rotary valve 5; Electrical control box 6; Jog switch 7; Voltage regulator 8; Drive shaft speed detection mechanism 9; Gear ring 91; Speed ​​element 92; Oil tank 10; Drive shaft 11. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] (Example 1)

[0017] See Figure 1 and Figure 2 The automatic parking device for the mine explosion-proof trackless rubber-tired vehicle in this embodiment mainly consists of an accumulator 1, a parking brake valve 2, a parking brake 3, an electromagnetic reversing valve 4, a rotary valve 5, an electrical control box 6, a jog switch 7, a voltage regulator 8, a drive shaft speed detection mechanism 9, and an oil tank 10.

[0018] Accumulator 1 is the hydraulic power source for the automatic parking device in this embodiment, which can supply oil for short periods and maintain system pressure; oil tank 10 is used to receive return oil. The structure, working principle and installation of accumulator 1 and oil tank 10 on the mining explosion-proof trackless rubber-tired vehicle are the same as those in the prior art, and will not be described in detail.

[0019] The parking brake valve 2 is used by the driver to manually operate the parking brake and release brake of the explosion-proof trackless rubber-tired vehicle. The parking brake valve 2 is fluid-connected to the accumulator 1. The parking brake valve 2 has a handle. In this embodiment, the parking brake valve 2 preferably uses a 4WMM6Y-L6X / ZSF model brake valve. The parking brake valve 2 has an oil inlet P, an oil return port T, and working ports A and B. The parking brake valve 2 is fluid-connected to the accumulator 1 via its oil inlet P, and fluid-connected to the oil tank 10 via its oil return port T. The operation method of the parking brake valve 2 is the same as that of the prior art.

[0020] The parking brake 3 serves as the actuator for parking and releasing the brakes of the explosion-proof trackless rubber-tired vehicle. The parking brake 3 is equipped with a hydraulic cylinder, friction pads, and springs. The parking brake 3 preferably adopts the Changzhou Keshi W3B.03.04 model parking brake, whose structure and principle are the same as existing technologies and will not be described in detail.

[0021] An electromagnetic directional valve 4 is connected in series between the parking brake valve 2 and the parking brake 3. The electromagnetic directional valve 4 is used to achieve automatic parking braking of the explosion-proof trackless rubber-tired vehicle under set conditions. In this embodiment, the electromagnetic directional valve 4 is preferably a mining explosion-proof electromagnetic directional valve of model GDFW-02-2B2-D24A / 53. The electromagnetic directional valve 4 has an oil inlet P, an oil return port T, working ports A and B, and an electrical control terminal K. The working port B of the electromagnetic directional valve 4 is connected to the hydraulic cylinder of the parking brake 3. The rotary valve 5 serves as a selection switch for enabling or disabling the automatic parking function of the automatic parking device in this embodiment.

[0022] In this embodiment, the rotary valve 5 preferably adopts the DF3VIE-G3 / 8-35 hydraulic valve from Shanyan Hydraulics. The rotary valve 5 is equipped with an operating handle and has an oil inlet P and working ports A and B. The oil inlet P of the rotary valve 5 is connected to the return port T of the solenoid directional valve 4 through fluid, and the working port A of the rotary valve 5 is connected to the oil tank 10 through fluid. The working port B of the rotary valve 5, the oil inlet P of the solenoid directional valve 4, and the working port B of the parking brake valve 2 are connected to each other through fluid.

[0023] During use, the driver can operate the handle of the rotary valve 5 to close it, thus connecting the P and B ports of the rotary valve 5 and disabling the automatic parking function. When the rotary valve 5 is closed, regardless of whether the solenoid directional valve 4 is energized or de-energized, the parking brake 3 is connected to the B port of the parking brake valve 2. This means that the mine explosion-proof solenoid directional valve 3 has no effect on the flow of hydraulic oil, and the automatic parking function of this embodiment is disabled. When the driver chooses not to activate the automatic parking function of this embodiment, the parking function and operation method of the automatic parking device are the same as the existing manual parking brake device for explosion-proof trackless rubber-tired vehicles. In other words, the automatic parking device of this embodiment retains the functions and operation of the existing manual parking brake device.

[0024] The driver can operate the rotary valve 5 via its handle to open it, thus connecting its P and A ports and activating the automatic parking function. When the parking brake valve 2 is in the released position, its working port B is connected to the oil inlet P of the solenoid directional valve 4, while its working port A is blocked. If the solenoid directional valve 4 is de-energized, its working port B connects to the return port T, and the hydraulic oil in the parking brake 3 is unloaded through the solenoid directional valve 4 and the rotary valve 5, thus braking the parking brake 3 and completing the automatic parking function. If the solenoid directional valve 4 is energized, its working port B connects to the oil inlet P, and the hydraulic oil acts on the parking brake 3 to release the parking brake, allowing the vehicle to drive normally.

[0025] The electrical control box 6 is used to control the power supply of the electromagnetic directional valve 4 to achieve automatic parking function release / brake operation based on the presence or absence of the generator output voltage of the explosion-proof trackless rubber-tired vehicle, the detection signal of the speed of the drive shaft 12, and the driver's operation signal. The electrical control box 6 is a commercially available component, preferably a Changzhou Zhida KXJ24 mining explosion-proof and intrinsically safe programmable control box. The electrical control box 6 has several signal input terminals and control signal output terminals. One of the control signal output terminals of the electrical control box 6 is electrically connected to the electrical control terminal K of the electromagnetic directional valve 4. The structure and working principle of the electrical control box 6 itself are mature existing technologies and will not be described in detail.

[0026] The jog switch 7 is used by the driver to press it when preparing to start the vehicle, thereby sending an electrical signal to the electronic control box 6 indicating that the vehicle is ready to start. The jog switch 7 is a commercially available component, and its signal output terminal is electrically connected to a signal input terminal designated in the electronic control box 6.

[0027] Voltage regulator 8 is used to send a detection signal to the electrical control box 6 to indicate whether the generator of the explosion-proof trackless rubber-tired vehicle has output voltage. When the engine of the explosion-proof trackless rubber-tired vehicle is running, the generator has voltage output; conversely, when the engine of the explosion-proof trackless rubber-tired vehicle is off, the generator has no voltage output. Voltage regulator 8 is an existing component of the explosion-proof trackless rubber-tired vehicle, and preferably adopts the TB-800 / 24YF explosion-proof generator regulator of Hengyang Yunxiang Electric. Its structure and working principle will not be described in detail.

[0028] The drive shaft speed detection mechanism 9 is used to detect and send the speed signal of the drive shaft 11 of the explosion-proof trackless rubber-tired vehicle to the electrical control box 6 in real time, so that the electrical control box 6 can determine whether the explosion-proof trackless rubber-tired vehicle is currently in a driving state or a parked state. As a specific implementation, the drive shaft speed detection mechanism 9 mainly consists of a gear ring 91 and a speed element 92, such as... Figure 2As shown, the gear ring 91 is an integrally circular structure. The outer circumference of the gear ring 91 is evenly spaced with several outwardly protruding teeth. Preferably, in this embodiment, the gear ring 91 has 16 teeth. The gear ring 91 is fixedly mounted on the drive shaft 11, allowing it to rotate synchronously with the drive shaft 11. Changes in the rotational speed of the drive shaft 11 will cause a synchronous change in the rotational speed of the gear ring 91. The rotational speed element 92 is fixedly mounted close to the gear ring 91, facing its front. The rotational speed element 92 is a commercially available component, preferably a YE0.3 / 24.4 model speed sensor from Tiandi (Changzhou) Automation. The signal output terminal of the rotational speed element 92 is electrically connected to a corresponding signal input terminal of the electrical control box 6. During operation, the gear ring 91 rotates once for every revolution of the drive shaft 11. The rotational speed element 92 detects this rotation and generates and sends a pulse signal to the control box 6 equal to the number of teeth on the gear ring 91 (e.g., if the gear ring 91 has 16 teeth, the rotational speed element 92 sends 16 pulse signals to the control box 6). The control box 6 determines the rotational speed of the drive shaft 11 based on the number of received pulse signals, and then determines whether the vehicle is in a driving or parked state according to a built-in threshold. Preferably, the drive shaft speed detection mechanism 9 has two identical sets, one located near the front axle of the explosion-proof trackless rubber-tired vehicle and the other near the rear axle, to improve the reliability of the control box 6's judgment of the vehicle's operating status.

[0029] The automatic parking device for the mine explosion-proof trackless rubber-tired vehicle of this embodiment is briefly described in terms of its method, process and working principle during use as follows:

[0030] The mine explosion-proof trackless rubber-tired car equipped with the automatic parking device of this embodiment is currently in a parked state with the engine off. After the driver gets on the vehicle, he first starts the engine. After the vehicle completes its self-check (the vehicle's own functions), the driver selects whether to enable the automatic parking function of the automatic parking device of this embodiment by operating the rotary valve 5.

[0031] If the driver chooses not to enable the automatic parking function, the driver only needs to operate the vehicle and park in the same way as the manual parking brake in the existing technology.

[0032] If the driver selects to enable the automatic parking function, the automatic parking device in this embodiment will automatically perform the following actions under the driver's corresponding operation:

[0033] From the time the vehicle completes its self-check until it has not yet engaged gears and started moving: the engine is running, the generator has voltage output, and the voltage regulator 8 sends a detection signal to the electronic control box 6 indicating that the generator has voltage output; at this time, since the drive shaft 11 is not rotating, the drive shaft speed detection mechanism 9 does not send a pulse signal to the electronic control box 6, and the electronic control box 6 thus determines that the vehicle is in a parked state. At this time, regardless of whether the driver has pressed the jog switch 7, since the three signal conditions cannot be met simultaneously, the electronic control box 6 controls the solenoid reversing valve 4 to continue to maintain the de-energized state when parking, and the vehicle remains in a braking state accordingly;

[0034] During vehicle gear shifting, starting, and normal driving: The driver operates the parking brake valve 2 to the released position or keeps the original parking brake valve 2 in the released position, presses the jog switch 7, and then engages gear and accelerates to start. The voltage regulator 8 continues to send a detection signal to the electronic control box 6 indicating that the generator has voltage output. Since the drive shaft 11 has started to rotate, the drive shaft speed detection mechanism 9 sends a pulse signal to the electronic control box 6. When the number of pulse signals received by the electronic control box 6 reaches the set threshold, since the three signal conditions are met simultaneously, the electronic control box 6 controls the solenoid directional valve 4 to be energized. The working port B of the solenoid directional valve 4 changes from being connected to the return port T when de-energized to being connected to the inlet port P. The hydraulic oil acts on the parking brake 3 to release the parking brake, and the vehicle can start normal driving. During the normal driving phase, the aforementioned three signal conditions are always met simultaneously.

[0035] When the vehicle comes to a complete stop without turning off the engine, as the transmission shaft speed detection mechanism 9 sends no pulse signal to the electronic control box 6, the electronic control box 6 determines that the vehicle is in a parked state. Since the three signal conditions cannot be met simultaneously, the electronic control box 6 controls the solenoid directional valve 4 to de-energize. The working port B of the solenoid directional valve 4 changes from being connected to the oil inlet P when energized to being connected to the oil return port T when de-energized. The hydraulic oil in the parking brake 3 is unloaded through the solenoid directional valve 4 and the rotary valve 5, and the parking brake 3 achieves braking, completing the automatic parking.

[0036] When the vehicle comes to a complete stop and the engine is off, the voltage regulator 8 sends a detection signal that the generator has no voltage output to the electronic control box 6; at the same time, the drive shaft speed detection mechanism 9 sends no pulse signal to the electronic control box 6. Since the three signal conditions cannot be met at the same time, the electronic control box 6 controls the solenoid reversing valve 4 to de-energize, and together with the aforementioned parking brake 3, brakes are applied to complete the automatic parking.

[0037] As can be seen from the foregoing, the automatic parking device for the mine explosion-proof trackless rubber-tired vehicle in this embodiment, through the improved design of the overall structure, enables the explosion-proof trackless rubber-tired vehicle to automatically brake and park when stopped or turned off. After the parking brake is applied, the driver must manually release the brake before the vehicle can move. This effectively solves the safety hazards of vehicle slippage caused by the driver forgetting to manually brake and the vehicle lurching out when starting the vehicle, which are common in the prior art. It avoids safety accidents caused by these two hazards and greatly improves the safety of driving and operating the explosion-proof trackless rubber-tired vehicle in the coal mine. Moreover, the automatic parking device in this embodiment retains the function of the manual parking brake device in the prior art through its structural design. The driver can switch between manual parking and automatic parking functions by simply using the rotary valve 5 with a "one-button" operation, which can effectively meet the individual needs of different drivers.

[0038] The above embodiments are descriptions of specific implementations of the present invention, and not limitations thereof. Those skilled in the art can make various modifications and changes without departing from the spirit and scope of the present invention to obtain corresponding equivalent technical solutions. Therefore, all equivalent technical solutions should be included in the patent protection scope of the present invention.

Claims

1. A mine-used explosion-proof trackless rubber-tyred vehicle automatic parking device, comprising an accumulator as a hydraulic power source, a parking brake valve connected to the accumulator in liquid communication for manual operation by a driver to realize parking brake and release brake, a parking brake for applying brake and releasing brake to a wheel, and an oil tank for oil return, characterized in that: The application also comprises an electromagnetic reversing valve connected in series between the parking brake valve and the parking brake for realizing automatic parking of the explosion-proof trackless rubber-tyred vehicle under the condition of meeting the set condition, a switching valve connected with the electromagnetic reversing valve and the parking brake valve as a selection switch for enabling or disabling the automatic parking function, a voltage regulator for detecting the output voltage of the generator of the explosion-proof trackless rubber-tyred vehicle, a transmission shaft speed detection mechanism for detecting the transmission shaft speed of the explosion-proof trackless rubber-tyred vehicle, a jog switch for sending an electric signal when the driver prepares to start the vehicle, and an electric control box for receiving the signals sent by the voltage regulator, the transmission shaft speed detection mechanism and the jog switch and sending corresponding control signals to the electromagnetic reversing valve after processing.

2. The automatic parking device of the mine explosion-proof trackless rubber-tyred vehicle according to claim 1, characterized in that: The parking brake valve has an oil inlet P, an oil return T and working ports A and B, and the oil inlet P of the parking brake valve is connected with the accumulator in liquid communication, and the oil return T is connected with the oil tank in liquid communication.

3. The automatic parking device of the mine explosion-proof trackless rubber-tyred vehicle according to claim 2, characterized in that: The electromagnetic reversing valve has an oil inlet P, an oil return T, working ports A and B and an electric control end K, and the switching valve has an oil inlet P and working ports A and B; the working port B of the electromagnetic reversing valve is connected with the hydraulic cylinder of the parking brake in liquid communication; the oil inlet P of the switching valve is connected with the oil return T of the electromagnetic reversing valve in liquid communication, the working port A of the switching valve is connected with the oil tank in liquid communication, the working port B of the switching valve and the oil inlet P of the electromagnetic reversing valve and the working port B of the parking brake are connected with each other in liquid communication; and the electric control end K of the electromagnetic reversing valve is connected with the electric control box in electricity.

4. The automatic parking device of the mine explosion-proof trackless rubber-tyred vehicle according to any one of claims 1-3, characterized in that: The transmission shaft speed detection mechanism comprises a gear ring and a speed element, the gear ring is a circular structure, a plurality of outward protruding teeth are uniformly and spacedly arranged on the outer periphery of the gear ring, the gear ring is fixed on the transmission shaft and can rotate synchronously with the transmission shaft, and the speed element is fixed on the explosion-proof trackless rubber-tyred vehicle in close proximity to the front surface of the gear ring.

5. The automatic parking device of the mine explosion-proof trackless rubber-tyred vehicle according to claim 4, characterized in that: The number of the teeth arranged on the gear ring is 16.

6. The automatic parking device of the mine explosion-proof trackless rubber-tyred vehicle according to claim 4, characterized in that: The transmission shaft speed detection mechanism has two sets of the same structure, one set is arranged near the front axle of the explosion-proof trackless rubber-tyred vehicle, and the other set is arranged near the rear axle of the explosion-proof trackless rubber-tyred vehicle.

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