CN116336025B - Mining shuttle car cable reeling electrohydraulic control valve group and cable reeling control method thereof - Google Patents

Abstract

The present invention relates to a cable winding electro-hydraulic control valve group for a mining shuttle car and a cable winding control method thereof, and belongs to the field of shuttle car control technology. The present invention comprises a valve block, a two-position three-way electromagnetic reversing valve, a proportional relief valve and a controller. The two-position three-way electromagnetic reversing valve and the proportional relief valve are installed in the inner cavity of the valve block. The T port of the two-position three-way electromagnetic reversing valve is connected to the oil tank of the hydraulic system of the shuttle car. The A port of the two-position three-way electromagnetic reversing valve is connected to the oil inlet of the cable winding motor. The inlet and outlet of the proportional relief valve are respectively connected to the oil inlet and outlet of the cable winding motor. The two-position three-way electromagnetic reversing valve and the proportional relief valve are both connected to the controller. The present invention not only greatly simplifies the structure, but also can realize real-time linkage with the shuttle car state through the proportional relief valve, realize the control of cable winding oil circuit switching and overflow pressure adjustment on demand, avoid the shuttle car from causing heat and energy waste in the idle state, and reduce the constant high-pressure overflow and energy loss during the shuttle car travel.

Description

Mine shuttle cable winding electro-hydraulic control valve group and cable winding control method thereof

Technical Field

The invention relates to the technical field of shuttle car control, and in particular to a cable winding electro-hydraulic control valve group for a mining shuttle car and a cable winding control method thereof.

Background technique

The shuttle car is a key supporting equipment for mechanized mining technology and is used for short-distance transportation of coal in short-wall working faces. The specific working process of the shuttle car is to load coal from the continuous coal miner or anchor miner, transport it to the feeder crusher for unloading, and frequently reciprocate between the loading and unloading points to realize the transportation of coal in the working face. The shuttle car is powered by a towing cable and is equipped with an onboard automatic cable winding system. The device can accommodate a certain length of cable and has the function of automatically retracting and releasing the cable as the equipment moves backward and forward. The heat dissipation of the hydraulic system of the shuttle car must not only consider its own heat generation, but also the heat generation of the brake. When the shuttle car is used in underground mining conditions with high ambient temperature, the heat dissipation problem of the hydraulic system becomes particularly prominent. However, the shuttle car has limited space and it is difficult to install auxiliary parts such as radiators. Therefore, how to reduce the heat generation of the hydraulic system and improve efficiency is crucial to the stable and efficient operation of the shuttle car. The cable winding control valve group of the shuttle car is the valve group that controls the retraction and release of the cable of the shuttle car.

The existing shuttle car's cable winding control valve group is mainly composed of a hydraulically controlled reversing valve, a one-way valve, a large torque (high pressure) relief valve, a small torque (low pressure) relief valve, and a valve body. The switching of the reversing valve is completed by hydraulic control. When the shuttle car is loading or unloading coal or in other idle states, the full flow and high pressure (large torque relief valve setting value) of the cable winding circuit overflows, causing energy waste and increasing the heat generation of the hydraulic system. During the coal transportation process, the excess flow of the cable winding circuit always overflows at a fixed high pressure, causing energy loss and a large range of cable tension changes. During the return to the coal loading point, the cable winding motor is in the "pump" working condition. In order to prevent parking, the cable winding drum continues to release the cable due to inertia, and the small torque (low pressure) relief valve provides a certain back pressure, but during the return driving process, the overflow is useless, causing heat and energy loss.

In summary, the existing shuttle cable winding control valve group not only has a complex structure, but also has poor matching between the oil circuit and pressure switching and the shuttle operation state, causing the shuttle cable winding circuit to be in a full flow, high pressure overflow heating state when the shuttle is idling, which increases the heat generated by the hydraulic system, makes heat dissipation difficult, and causes unnecessary energy loss.

Summary of the invention

In order to solve the above technical problems, the present invention provides a mining shuttle cable winding electro-hydraulic control valve group and a cable winding control method thereof. The technical solution of the present invention is as follows:

In the first aspect, a mining shuttle cable winding electro-hydraulic control valve group is provided, which includes a valve block, a two-position three-way solenoid reversing valve, a proportional relief valve and a controller, wherein the two-position three-way solenoid reversing valve and the proportional relief valve are installed in the inner cavity of the valve block, the T port of the two-position three-way solenoid reversing valve is connected to the oil tank of the shuttle hydraulic system, the A port of the two-position three-way solenoid reversing valve is connected to the oil inlet of the cable winding motor, the inlet and outlet of the proportional relief valve are respectively connected to the oil inlet and oil outlet of the cable winding motor, and the two-position three-way solenoid reversing valve and the proportional relief valve are both connected to the controller.

Optionally, the mining shuttle cable winding electro-hydraulic control valve group further includes an infrared distance measuring sensor, which is installed on the cable winding drum and connected to the controller.

Optionally, the two-position three-way electromagnetic reversing valve adopts a two-position three-way explosion-proof electromagnetic reversing valve, and the proportional relief valve adopts an explosion-proof proportional relief valve.

Optionally, the two-position three-way electromagnetic reversing valve and the proportional relief valve are both of threaded plug-in type.

In a second aspect, a cable winding control method of a cable winding electro-hydraulic control valve group for a mining shuttle car is provided. The cable winding control method adopts the cable winding electro-hydraulic control valve group for a mining shuttle car described in the first aspect, and comprises the following steps:

S1, when the shuttle car is in the idle state, the controller controls the two-position three-way electromagnetic reversing valve to lose power, and the pressure oil of the cable winding circuit flows directly back to the oil tank;

S2, when the shuttle car is in the process of transporting coal, the controller controls the two-position three-way electromagnetic reversing valve to be energized and reversed, and the pressure oil in the cable winding circuit drives the cable winding motor to wind the cable. During this process, the controller controls the proportional relief valve to be energized and continuously adjusts the relief pressure.

Optionally, when the controller controls the proportional relief valve to be energized and continuously adjusts the relief pressure, the relief pressure is determined according to the effective cable winding radius of the cable winding drum measured by the infrared ranging sensor, and the cable winding motor is controlled to perform constant tension cable winding according to the relief pressure.

Optionally, when the controller detects a braking signal for the shuttle car, the controller controls the proportional relief valve to reduce the relief pressure to provide back pressure for the cable winding motor to prevent the cable winding drum from continuing to release the cable due to inertia.

All the optional technical solutions mentioned above can be combined arbitrarily, and the present invention does not provide detailed descriptions of the structures after the combinations.

By means of the above scheme, the beneficial effects of the present invention are as follows:

The mining shuttle cable winding electro-hydraulic control valve group is composed of a two-position three-way electromagnetic reversing valve and a proportional relief valve. Compared with the cable winding control valve group in the prior art, not only is the structure greatly simplified, but also the proportional relief valve can be used to achieve real-time linkage with the shuttle car state, so as to realize the control of cable winding oil circuit switching and overflow pressure adjustment as needed, thereby avoiding heating problems and energy waste caused by full flow and high-pressure overflow in the idle state of the shuttle car, and reducing the constant high-pressure overflow and energy loss during the travel of the shuttle car, thereby improving the stress condition of the cable and thus increasing the service life of the cable.

The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of the composition structure of the present invention.

FIG. 2 is a schematic diagram showing the connection relationship of the controller in the present invention.

Detailed ways

The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

As shown in Figures 1 and 2, an embodiment of the present invention provides a mining shuttle cable winding electro-hydraulic control valve group, which includes a valve block 1, a two-position three-way solenoid reversing valve 2, a proportional relief valve 3 and a controller 4. The two-position three-way solenoid reversing valve 2 and the proportional relief valve 3 are installed in the inner cavity of the valve block 1, the T port of the two-position three-way solenoid reversing valve 2 is connected to the oil tank 6 of the shuttle hydraulic system, the A port of the two-position three-way solenoid reversing valve 2 is connected to the oil inlet of the cable winding motor 7, the inlet and outlet of the proportional relief valve 3 are respectively connected to the oil inlet and oil outlet of the cable winding motor 7, and the two-position three-way solenoid reversing valve 2 and the proportional relief valve 3 are both connected to the controller 4.

The two-position three-way electromagnetic reversing valve 2 is a normally open two-position three-way electromagnetic reversing valve. The controller 4 can be a PLC or a single-chip microcomputer.

Based on this structure, when the two-position three-way electromagnetic reversing valve 2 is de-energized (i.e., the P port of the two-position three-way electromagnetic reversing valve 2 is connected to the T port), the pressure oil of the cable winding circuit flows directly back to the oil tank 6; when the two-position three-way electromagnetic reversing valve 2 is energized (i.e., the P port of the two-position three-way electromagnetic reversing valve 2 is connected to the A port), the pressure oil drives the cable winding motor 7 to wind the cable. The cable winding pressure and cable releasing pressure can be adjusted by the proportional relief valve 3, and the two-position three-way electromagnetic reversing valve 2 and the proportional relief valve 3 are controlled by the controller 4 according to the sensor information or the driver's command information.

Optionally, the mining shuttle cable winding electro-hydraulic control valve group further includes an infrared distance sensor 5, which is mounted on the cable winding drum 8 and connected to the controller 4. By providing the infrared distance sensor 5, the effective cable winding radius of the cable winding drum 8 can be detected in real time, so that the controller 4 can control the opening of the proportional relief valve 3 according to the effective cable winding radius of the cable winding drum 8, thereby controlling the cable winding pressure and the cable releasing pressure.

The two-position three-way electromagnetic reversing valve 2 adopts a two-position three-way explosion-proof electromagnetic reversing valve, and the proportional relief valve 3 adopts an explosion-proof proportional relief valve to meet the use requirements in coal mines.

In addition, the two-position three-way electromagnetic reversing valve 2 and the proportional relief valve 3 are both threaded plug-in type, that is, the two-position three-way electromagnetic reversing valve 2 and the proportional relief valve 3 are threadedly connected to the inner cavity of the valve block 1. Of course, the two-position three-way electromagnetic reversing valve 2 and the proportional relief valve 3 can also be plate valves or tube valves.

The embodiment of the present invention further provides a cable winding control method of a cable winding electro-hydraulic control valve group for a mining shuttle vehicle. The cable winding control method adopts the cable winding electro-hydraulic control valve group for a mining shuttle vehicle described in the above embodiment, and comprises the following steps:

S1, when the shuttle car is in the idle state, the controller 4 controls the two-position three-way electromagnetic reversing valve 2 to lose power, and the pressure oil of the cable winding circuit directly flows back to the oil tank 6.

Specifically, when the shuttle car is loading or unloading coal or in other non-moving states, it is in an idling state. By setting the pressure oil of the cable winding circuit to flow directly back to the oil tank 6 when the shuttle car is in the idling state, it is ensured that there is no overflow energy loss in the idling state of the shuttle car, that is, there is no overflow heating in the cable winding circuit.

S2, when the shuttle car is in the process of transporting coal, the controller 4 controls the two-position three-way electromagnetic reversing valve 2 to be energized and reversed, and the pressure oil in the cable winding circuit drives the cable winding motor 7 to wind the cable. During this process, the controller 4 controls the proportional relief valve 3 to be energized and continuously adjusts the relief pressure.

Specifically, the controller 4 controls the pressure range of the overflow pressure to be between P1 (2.5MPa) and P2 (6MPa), and the specific pressure value is determined according to the effective cable winding radius of the cable winding drum measured by the infrared ranging sensor 5. The controller 4 controls the proportional overflow valve 3 to be energized and continuously adjust the overflow pressure, so that the excess flow overflows with variable pressure during the cable winding process, avoiding the overflow of fixed high pressure and reducing the overflow heat.

Preferably, when the controller 4 controls the proportional relief valve 3 to be energized and continuously adjusts the relief pressure, the relief pressure is determined according to the effective cable winding radius of the cable winding drum 8 measured by the infrared ranging sensor 5, and the cable winding motor 7 is controlled to perform constant tension cable winding according to the relief pressure.

Specifically, the principle that the controller 4 controls the proportional relief valve 3 to be energized and controls the cable winding motor 7 to perform constant tension cable winding is as follows: (1)

In formula (1), N represents the driving torque of the cable winding drum 8; T represents the tension on the cable; and R' represents the actual cable winding radius. (2)

In formula (2), △ P represents the pressure difference between the inlet and outlet of the hydraulic motor; Indicates chain transmission efficiency; /> represents the mechanical efficiency of the cable winding motor; i represents the transmission ratio between the drum sprocket and the motor sprocket; /> Indicates cable motor displacement.

Combining formula (1) and formula (2), let the constant and fixed coefficient be K, then (3)

In formula (3), R' can be indirectly measured by the infrared distance sensor 5. According to the actual cable winding radius R' value, the controller 4 adjusts the ΔP value by adjusting the pressure setting value of the proportional relief valve 3. Specifically, when R' increases, ΔP increases, and vice versa. Therefore, the T value can be kept constant, achieving the purpose of constant tension cable winding.

In summary, in the embodiment of the present invention, the pressure adjustment of the proportional overflow valve 3 during the cable winding process can match the pressure according to the real-time effective cable winding radius value measured by the infrared ranging sensor 5, thereby avoiding constant high-pressure overflow during the cable winding process, reducing overflow heat generation, and achieving approximately constant tension cable winding.

Further, when the controller 4 detects the brake signal of the shuttle car, the controller 4 controls the proportional relief valve 3 to reduce the overflow pressure to provide back pressure for the cable winding motor 7 to prevent the cable winding drum 8 from continuing to release the cable due to inertia. Specifically, the speed of the shuttle car can be detected in real time by the speed sensor. When the speed decreases sharply, it is determined that the brake signal of the shuttle car is detected. Further, when reducing the overflow pressure, the overflow pressure can be adjusted to 1.5MPa.

In summary, in addition to effectively reducing the ineffective energy consumption and heat generation of the hydraulic system, the present invention can also realize approximately constant tension cable winding through the effective cable winding radius measured by the infrared ranging sensor 5 and the proportional relief valve 3, thereby improving the stress condition of the cable. Specifically, under the condition of a certain cable tensioning suspension distance, the tension force on the cable is reduced. Secondly, compared with the existing cable winding valve group, the mining shuttle cable winding electro-hydraulic control valve group involved in the present invention greatly reduces the number of valve components used and greatly simplifies the structure.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims (5)

1. A mining shuttle cable winding electro-hydraulic control valve group, characterized in that it comprises a valve block (1), a two-position three-way electromagnetic reversing valve (2), a proportional relief valve (3), a controller (4) and an infrared distance measuring sensor (5), wherein the two-position three-way electromagnetic reversing valve (2) and the proportional relief valve (3) are installed in the inner cavity of the valve block (1), the T port of the two-position three-way electromagnetic reversing valve (2) is connected to the oil tank (6) of the shuttle hydraulic system, the A port of the two-position three-way electromagnetic reversing valve (2) is connected to the oil inlet of the cable winding motor (7), the inlet and outlet of the proportional relief valve (3) are respectively connected to the oil inlet and oil outlet of the cable winding motor (7), the two-position three-way electromagnetic reversing valve (2) and the proportional relief valve (3) are both connected to the controller (4), and the infrared distance measuring sensor (5) is installed on the cable winding drum (8) and connected to the controller (4). 2. The mining shuttle cable winding electro-hydraulic control valve group according to claim 1, characterized in that the two-position three-way electromagnetic reversing valve (2) adopts a two-position three-way explosion-proof electromagnetic reversing valve, and the proportional relief valve (3) adopts an explosion-proof proportional relief valve. 3. The mining shuttle cable winding electro-hydraulic control valve group according to claim 1, characterized in that the two-position three-way electromagnetic reversing valve (2) and the proportional relief valve (3) are both of threaded plug-in type. 4. A cable winding control method for a mining shuttle cable winding electro-hydraulic control valve group, characterized in that the cable winding control method adopts the mining shuttle cable winding electro-hydraulic control valve group according to any one of claims 1 to 3, comprising the following steps: S1, when the shuttle car is in the idle state, the controller (4) controls the two-position three-way electromagnetic reversing valve (2) to lose power, and the pressure oil in the cable winding circuit flows directly back to the oil tank (6); S2, when the shuttle car is in the process of transporting coal, the controller (4) controls the two-position three-way electromagnetic reversing valve (2) to be energized and reversed, and the pressure oil in the cable winding circuit drives the cable winding motor (7) to wind the cable. During this process, the controller (4) controls the proportional relief valve (3) to be energized and continuously adjust the relief pressure; When the controller (4) controls the proportional relief valve (3) to be energized and continuously adjusts the relief pressure, the relief pressure is determined according to the effective cable winding radius of the cable winding drum (8) measured by the infrared distance measuring sensor (5), and the cable winding motor (7) is controlled according to the relief pressure to perform constant tension cable winding. 5. The cable winding control method according to claim 4 is characterized in that when the controller (4) detects a braking signal for the shuttle car, the controller (4) controls the proportional relief valve (3) to reduce the relief pressure to provide back pressure for the cable winding motor (7) to prevent the cable winding drum (8) from continuing to release the cable due to inertia.