A Manufacturing Method of Automatic Winding and Unwinding Device for Flameproof Cable Drum

Patent: A Manufacturing method of automatic winding and unwinding device for flameproof cable drum

Technical Field: The present invention involves a technology for winding and unwinding cables in coal mine equipment, in particular to an automatic winding and unwinding device for flameproof cable drums.

Background Art: With the continuous improvement of mechanization degree of coal mine equipment, large-scale electric traction mobile equipment (such as roadheader, continuous miner, shuttle car, etc.) is more and more widely used in coal mines because of its advantages of energy saving, environmental protection and high integrated control degree. Since the towed cable structure is used, the running speed and maximum running distance of these equipment are severely restricted by the performance of cable drum. Mine cable has high voltage (1140V) and there are flameproof requirements to it, and its overall size and weight are very large. Motor drive and electric control are generally used for the traditional cable automatic winding mechanism, and there is no flameproof mechanism in the lead-in and lead-out position of the cable. However, due to the high air humidity in the coal mine and the existence of explosive gases such as methane, the traditional motor drive and electric control can not be directly applied in the coal mine.

Contents:

The technical problem to be solved by the invention is to propose an automatic winding and unwinding device for flameproof cable drums aim at the shortcomings of the prior art, which can increase the moving distance of equipment, speed up the moving speed of equipment, reduce the workload of miners and improve the working efficiency of equipment. The technical problem to be solved by the invention is realized by the following technical scheme: an automatic winding and unwinding device for flameproof cable drums, comprising a cable drum hydraulic motor, an oil supply pipe and an oil return pipe of the cable drum hydraulic motor, featuring an overflow control system installed between the oil supply pipe and the oil return pipe. The overflow control system consists of a hydraulic control reversing valve and a one-way valve installed on the oil supply pipe, and the oil inlet side of the one-way valve is provided with a winding control oil circuit and an oil drain pipe connected with the oil return pipe. The winding control oil circuit is provided with a high-pressure relief valve, the oil outlet side of the one-way valve is provided with an unwinding control oil circuit connected with the oil return pipe, the unwinding control oil circuit is provided with a low pressure-relief valve, the winding control oil circuit is connected with the winding control position of the hydraulic control reversing valve, the oil drain pipe and the unwinding control oil circuit are connected with the unwinding control position of the hydraulic control reversing valve, and the oil inlet of the hydraulic control reversing valve is connected with the oil supply pipe at the oil outlet side of the one-way valve. The technical problem to be solved by the invention can be further realized by the following technical scheme: a parking brake circuit is arranged between the oil supply pipe and the oil return pipe in the front of the overflow control system, and a hydraulic control one-way valve is arranged on the parking brake circuit. The technical problem to be solved by the invention can be further realized by the following technical scheme: an adjustable throttle circuit and an overhaul circuit are installed between the oil supply pipe and the oil return pipe at the rear of the overflow control system, the adjustable throttle circuit is provided with a throttle valve that can adjust the oil quantity, and the overhaul circuit is provided with a high-pressure ball valve. When winding the cable, the winding control oil circuit is in working state, hydraulic oil enters the hydraulic motor of the cable drum through the one-way valve, and the hydraulic motor drives the cable drum to rotate by feeding oil forward, thus winding the cable. At this time, the oil supply pressure of the hydraulic motor (i.e., the winding torque) is set by the high-pressure relief valve, and when the set pressure value is exceeded, the high-pressure relief valve will realize the pressure relief of overflow. When unwinding the cable, the cable is pulled out of the drum by the traction of the shuttle car, which makes the hydraulic motor rotate in the reverse direction and work in the mode of hydraulic pump. The pressure of the oil supply pipe at the oil outlet side of the one-way valve rises, which makes the hydraulic control reversing valve move to the unwinding control position. At this time, the pressure oil directly returns to the oil tank through the oil drain pipe, and the high-pressure oil discharged from the hydraulic motor goes to the oil return tank through the unwinding control oil circuit, and the low-pressure relief valve controls the oil return pressure. When the equipment is stationary and in the parking brake state, the hydraulic control one-way valve controlled by the pressure of the parking brake system is opened, and the oil supplied by the oil pump directly returns to the oil tank without passing the control valve block, which can greatly reduce the working load of the pump and the system calorific value. Compared with the prior art, the positive and negative rotation of the hydraulic motor is automatically controlled through the overflow of the high-pressure relief valve and the low-pressure relief valve under the set pressure in this invention, thereby realizing the automatic winding and unwinding of the cable. The cable drum automatic winding and unwinding device can be widely used in various underground electric traction devices in coal mines. By realizing automatic winding and unwinding of cables on flameproof cable drums, automatic pressure relief, buffering and shock absorption, overload protection, and cable full winding and unwinding protection, it can effectively increase the running distance of the devices, improve the running speed of the devices, simplify the operation procedures, reduce the workload of miners, improve the working efficiency of the devices, greatly promote the wide application of large-scale electric traction mobile devices in coal mines, and improve the localization speed, thus it features great economic and social benefits.

The hydraulic principle diagram of the present invention is shown in Fig. 1.

Detailed description of the invention: An automatic winding and unwinding device for flameproof cable drum, comprising a cable drum hydraulic motor 7, an oil supply pipe 11 and an oil return pipe 1 of the cable drum hydraulic motor 7. The oil supply pipe 11 is connected with a gear pump, the oil return pipe 1 is connected with an oil return tank, an overflow control system 12 is installed between the oil supply pipe 11 and the oil return pipe 1. The overflow control system 12 includes a hydraulic control reversing valve 14 and a one-way valve 13 installed on the oil supply pipe. On the oil inlet side of one-way valve 13, there are winding control oil circuit 2 and oil drain pipe 3 which are connected with the oil return pipe. The winding control oil circuit 2 is provided with a high-pressure relief valve 9, while the oil outlet side of one-way valve 13 is provided with an unwinding control oil circuit 4 which is equipped with a low-pressure relief valve 8. The winding control oil circuit  2 is connected to the winding control position of the hydraulic control reversing valve 14, and the oil drain circuit 3 and the unwinding control oil circuit 4 are connected to the unwinding control position of the hydraulic control reversing valve 14. The oil inlet of the hydraulic control reversing valve 14 is connected with the oil supply pipe on the oil outlet of the one-way valve. A parking brake circuit is designed between the oil supply pipe and the oil return pipe in the front of the overflow control system 12, and a hydraulic control one-way valve 10 is installed on the parking brake circuit. An adjustable throttle circuit and an overhaul circuit are installed between the oil supply pipe and the oil return pipe at the rear of the overflow control system 12. The adjustable throttle circuit is equipped with a throttle valve 5 with adjustable oil quantity and the overhaul circuit is equipped with a high-pressure ball valve 6. Oil is supplied by a gear pump with a flow rate of 21.71L/Min, which is one of the triple pumps, and its main function is to control the automatic winding and unwinding of cables. The working principle is that the positive and negative rotation of the hydraulic motor is automatically controlled through the overflow of the high-pressure relief valve and the low-pressure relief valve under the set pressure in this invention, thereby realizing the automatic winding and unwinding of the cable. The working process is as follows: When the shuttle car runs in the direction of power supply, that is, when the cable is wound up, the hydraulic control reversing valve is in the left winding control position under the action of the reset spring, and the pressure oil output by the gear pump enters the hydraulic motor of the cable drum through the one-way valve, and the hydraulic motor drives the cable drum to rotate by feeding oil in the forward direction, so as to wind up the cable. At this time, the oil supply pressure of the hydraulic motor (i.e., the winding torque) is set by the high-pressure relief valve, and the pressure value is set according to the cable parameters of the shuttle car and the hanging angle of the cable when the equipment is under operation. When the shuttle car runs away from the power supply, that is, when the cable is unwound, the cable is pulled out from the drum under the action of the traction force of the shuttle car, which makes the hydraulic motor rotate reversely and work in the mode of hydraulic pump. The one-way valve is closed, which makes the pressure of the oil inlet controlled by the hydraulic control reversing valve increase, and the valve core is reversed under the action of the reverse control pressure. At this time, the oil discharged from the oil pump directly returns to the oil tank through the reversing valve and the oil drain pipe, and the high-pressure oil discharged from the hydraulic motor returns to the oil tank through the low-pressure relief valve, and only a part of the oil participates in circulation of oil supply of the motor. Set the pressure of the low-pressure relief valve according to the cable parameters (weight and tensile strength, etc.). When the equipment is stationary and in the parking brake state, the hydraulic control one-way valve controlled by the pressure of the parking brake system is opened, and the oil supplied by the gear pump directly returns to the oil tank without passing the overflow control system, which can greatly reduce the working load of the pump and the system calorific value. The throttle valve with adjustable oil quantity can adjust the flow according to different cable types, and at the same time buffer the impact torque of the motor when winding the cable. The high-pressure ball valve opens when the cable drum has fault or is installed for the first time, which can realize the free rotation of the cable drum. The high-pressure overflow condition is when the shuttle car is not moving and the parking brake is not executed, and when the shuttle car is driving in the direction of power supply (i.e. the cable winding state); The low-pressure overflow condition is when the shuttle car runs away from the power supply (i.e. the cable unwinding state); The working condition of the hydraulic control one-way valve is when the equipment is under parking brake; The opening conditions of high-pressure ball valve is when the oil pump motor shuts off and the cable drum needs to rotate freely.

Claims:

1. An automatic winding and unwinding device for flameproof cable drums, comprising a cable drum hydraulic motor, an oil supply pipe and an oil return pipe of the cable drum hydraulic motor, featuring an overflow control system installed between the oil supply pipe and the oil return pipe. The overflow control system consists of a hydraulic control reversing valve and a one-way valve installed on the oil supply pipe, and the oil inlet side of the one-way valve is provided with a winding control oil circuit and an oil drain pipe connected with the oil return pipe. The winding control oil circuit is provided with a high-pressure relief valve, the oil outlet side of the one-way valve is provided with an unwinding control oil circuit connected with the oil return pipe, the unwinding control oil circuit is provided with a low pressure-relief valve, the winding control oil circuit is connected with the winding control position of the hydraulic control reversing valve, the oil drain pipe and the unwinding control oil circuit are connected with the unwinding control position of the hydraulic control reversing valve, and the oil inlet of the hydraulic control reversing valve is connected with the oil supply pipe at the oil outlet side of the one-way valve.

2. According to the automatic winding and unwinding device for flameproof cable drums in Claim 1, a parking brake circuit is arranged between the oil supply pipe and the oil return pipe in the front of the overflow control system, and a hydraulic control one-way valve is arranged on the parking brake circuit.

3. According to the automatic winding and unwinding device for flameproof cable drums in Claim 1, an adjustable throttle circuit and an overhaul circuit are installed between the oil supply pipe and the oil return pipe at the rear of the overflow control system, the adjustable throttle circuit is provided with a throttle valve that can adjust the oil quantity, and the overhaul circuit is provided with a high-pressure ball valve.

Abstract:

An automatic winding and unwinding device for flameproof cable drums, comprising a cable drum hydraulic motor, an oil supply pipe and an oil return pipe of the cable drum hydraulic motor. An overflow control system is installed between the oil supply pipe and the oil return pipe. The overflow control system consists of a hydraulic control reversing valve and a one-way valve installed on the oil supply pipe, and the oil inlet side of the one-way valve is provided with a winding control oil circuit and an oil drain pipe connected with the oil return pipe. The winding control oil circuit is provided with a high-pressure relief valve, the oil outlet side of the one-way valve is provided with an unwinding control oil circuit connected with the oil return pipe, the unwinding control oil circuit is provided with a low pressure-relief valve, the winding control oil circuit is connected with the winding control position of the hydraulic control reversing valve, the oil drain pipe and the unwinding control oil circuit are connected with the unwinding control position of the hydraulic control reversing valve, and the oil inlet of the hydraulic control reversing valve is connected with the oil supply pipe at the oil outlet side of the one-way valve. Automatic winding and unwinding of cables, automatic pressure relief, buffering and shock absorption, overload protection are realized, which can effectively increase the running distance of equipment, improve the running speed of equipment and improve the working efficiency of equipment.