Hydraulic push-pull oil injection device for cable logging tractor

Abstract

The present invention relates to a hydraulic push-pull oil filling device for a cable logging tractor without disassembly, wherein the low-pressure oil tank and the high-pressure oil tank are provided with oil inlet and outlet holes, and the low-pressure oil tank and the high-pressure oil tank are connected as a whole by a bearing pin screw. The bearing pin screw is located at the rightmost side of the waist-shaped groove of the high-pressure oil tank body, and the lower end is connected to the low-pressure oil tank; the bearing pin screw can move axially in the waist-shaped groove; the hydraulic pump is in the low-pressure oil tank, and the high-pressure output channel of the hydraulic pump is inserted into the push-pull system, and the push-pull system is in the high-pressure oil tank. The hydraulic pump divides the low-pressure oil tank into two parts, which are connected by the oil circuit in the hydraulic pump. Solenoid valves and one-way valves are respectively installed on both sides of the high-pressure output channel, and the solenoid valves and the one-way valves have oil circuits communicating with the low-pressure oil tank channels and the high-pressure oil tank channels respectively. When filling oil, the oil filling hole is connected to the pressure pump, the oil outlet hole is connected to the vacuum pump, and hydraulic oil is pressurized into the low-pressure oil tank. The injected hydraulic oil enters the high-pressure oil tank through the one-way valve oil circuit after passing through the low-pressure oil tank, and the oil filling is completed. The high-pressure and low-pressure oil tanks do not need to be separated and assembled for oil filling, and the process is simple and the effect is good.

Description

Technical Field

[0001] The invention relates to the maintenance of a horizontal well tractor, in particular to a hydraulic pushing and disassembly-free oiling device for a cable logging tractor. Background Art

[0002] As a mature horizontal well transportation technology, the tractor needs to be maintained periodically to ensure the success rate of logging. Since the tractors currently used are all hydraulic push devices, maintenance requires pumping and oiling of the instrument. The tractor itself has a functional safety device, namely a mechanical pull-off pressure relief device. During each maintenance, the pull-off device must be removed before pumping and oiling, and then the high-pressure output channel of the hydraulic pump must be separated from the high-pressure chamber with the help of external force before oiling. After the oiling is completed, the high-pressure output channel of the hydraulic pump must be inserted into the high-pressure chamber, and then the pull-off device must be installed. Not only is the pumping and oiling process relatively cumbersome, but the entire maintenance operation is troublesome, time-consuming and labor-intensive, affecting the maintenance effect of the instrument.

[0003] Reference Figure 2 4. The low-pressure tank 1 of the existing oil filling device has an oil inlet hole 12, and the high-pressure oil tank 5 has an oil outlet hole 15. The low-pressure tank 1 and the high-pressure oil tank 5 are connected as a whole by a load-bearing pin screw 2. The load-bearing pin screw is located at the rightmost side of the waist-shaped groove of the high-pressure oil tank, and the lower end is connected to the low-pressure oil tank screw. The load-bearing pin screw can move axially in the waist-shaped groove. The hydraulic pump screw 14 fixes the hydraulic pump 6 on the low-pressure tank, and the high-pressure output channel 7 of the hydraulic pump is inserted into the pushing system 10. The pushing system is in the high-pressure oil tank 5, and the pushing system has an oil channel 16 connected to the channel 7. The hydraulic pump divides the low-pressure oil tank into two parts, and the two parts are connected by two oil circuits 11 in the hydraulic pump.

[0004] When oil filling is required, since the high-pressure output channel 7 of the hydraulic pump is inserted into the high-pressure oil tank 5, the oil channel connecting the hydraulic oil in the high-pressure and low-pressure oil tanks is blocked, the safety pin 4 must be removed first, and the low-pressure oil tank 1 is separated from the high-pressure oil tank by external force. At this time, the load-bearing pin 2 is moved to the left end of the waist-shaped groove of the high-pressure oil tank 5 (see Figure 4a , b), the high-pressure output channel of the hydraulic pump 6 is separated from the high-pressure oil tank, so that the oil circuits in the high-pressure and low-pressure oil tanks are connected. The oil filling hole 12 is connected to the pressure pump to inject hydraulic oil into the low-pressure oil tank, and the oil outlet hole 15 is connected to the vacuum pump to evacuate the high-pressure oil tank to ensure that there is as little air as possible inside the high-pressure oil tank, and the injected hydraulic oil enters the high-pressure oil tank through the high-pressure output channel. After all the hydraulic oil is completely injected, the low-pressure oil tank 1 and the high-pressure oil tank 5 are closed with the help of external force. Since the high and low-pressure oil tanks are filled with oil, it is very difficult to close them. After closing, the load-bearing pin 2 returns to the rightmost side of the waist-shaped groove of the high-pressure oil tank 11, and the safety pin 4 is installed. Then the top screws of the oil inlet and oil outlet holes are installed, and the oil filling is completed.

[0005] The entire oiling process is cumbersome, troublesome to operate, time-consuming and labor-intensive. Summary of the invention

[0006] The purpose of the present invention is to provide a hydraulic push-pull oil injection device for a cable logging tractor which has a simple structure, does not require the removal of the safety pin for oil injection, separates the high and low pressure chambers, has a simple process and good effect.

[0007] The object of the present invention is achieved in that the hydraulic push-pull oil filling device of the cable logging tractor does not need to be disassembled, the low-pressure oil tank has an oil inlet hole, and the high-pressure oil tank has an oil outlet hole; the low-pressure oil tank and the high-pressure oil tank are connected as a whole by a load-bearing pin screw, and a sealing ring is provided at the connection; the load-bearing pin screw is located at the rightmost side of the waist-shaped groove of the high-pressure oil tank, and the lower end is connected to the low-pressure tank screw buckle; the load-bearing pin screw can move axially in the waist-shaped groove; the hydraulic pump screw fixes the hydraulic pump on the low-pressure oil tank, and the high-pressure output channel of the hydraulic pump is inserted into the push-pull system, and the push-pull system is in the high-pressure oil tank; the hydraulic pump divides the low-pressure oil tank into two parts, and the two parts are connected by two oil circuits in the hydraulic pump, and there is a sealing ring between the high-pressure output channel of the hydraulic pump and the high-pressure oil tank;

[0008] Solenoid valves and one-way valves are respectively installed on both sides of the high-pressure output channel inserted into the high-pressure oil tank. The solenoid valves and one-way valves have oil paths connected to the low-pressure oil tank and the high-pressure oil tank channels respectively.

[0009] When the present invention is used for oil filling, the oil filling hole is connected to a pressure pump, the oil outlet hole is connected to a vacuum pump, the low-pressure oil tank is pressurized and hydraulic oil is injected, and the one-way valve connects the oil passages of the low-pressure oil tank and the high-pressure oil tank. The injected hydraulic oil enters the high-pressure oil tank through the low-pressure oil tank and the one-way valve to achieve oil filling.

[0010] The invention has a simple structure, and the safety pin does not need to be removed for oil filling, and the high-pressure oil tank and the low-pressure oil tank are separated, so the oil filling process is simple and the effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the present invention.

[0012] Figure 2 This is the state diagram of the conventional oil injection method.

[0013] Figure 3 This is the state diagram of the oil injection method of the present invention.

[0014] Figure 4a , b is the position diagram of the load-bearing pin screw in the normal and oil-filled state. DETAILED DESCRIPTION

[0015] The present invention will be described in detail below with reference to the accompanying drawings.

[0016] Reference Figure 1The low-pressure oil tank 1 and the high-pressure oil tank 5 of the present invention are connected as a whole by a bearing pin screw 2, and a sealing ring 13 is provided at the connection. There is a nut 3 on the bearing pin screw. The low-pressure oil tank 1 has an oil inlet hole 12, and the high-pressure oil tank 5 has an oil outlet hole 15.

[0017] The load-bearing pin screw is located at the rightmost side of the waist-shaped groove of the high-pressure oil tank, and the lower end is connected to the threaded buckle of the low-pressure oil tank. The load-bearing pin screw can move axially in the waist-shaped groove. When it moves to the left side of the waist-shaped groove, the hydraulic pump 6 can be completely separated from the high-pressure oil tank. The hydraulic pump screw 14 fixes the hydraulic pump on the low-pressure oil tank, and the high-pressure output channel 7 of the hydraulic pump 6 is inserted into the pushing system 10. The pushing system is in the high-pressure oil tank 5, and the pushing system has an oil channel 16 connected to the high-pressure output channel 7. The hydraulic pump divides the low-pressure oil tank into two parts, and the two parts are connected by two oil circuits 11 in the hydraulic pump. There is a sealing ring 9 between the high-pressure output channel of the hydraulic pump and the high-pressure oil tank.

[0018] On the high-pressure oil tanks on both sides of the high-pressure output channel 7 inserted into the high-pressure oil tank 5, electromagnetic valves 17 and one-way valves 8 are installed respectively. The two ends of the electromagnetic valve and the one-way valve are connected to the low-pressure oil tank and the high-pressure oil tank respectively, and the electromagnetic valve and the one-way valve have oil paths communicating with the oil passage 16.

[0019] The opening channel pressure of the one-way valve of the present invention is 0.5-1 psi, and the reverse bearing pressure is 4000 psi. The one-way valve is in an open state during oil injection, and is in a closed state after the oil injection is completed.

[0020] The opening channel voltage of the solenoid valve of the present invention is 24V DC, and it is automatically closed when the power is off. When the solenoid valve is filled with oil, it is in a closed state; when the tractor pushes the system to retract, it is necessary to reduce the oil pressure of the high-pressure oil tank to a low pressure and connect the low-pressure oil tank, and the solenoid valve is in an open state, that is, the low-pressure oil tank and the high-pressure oil tank are connected.

[0021] The present invention has designed a set of safety system, that is, a shear pin 4 is provided at the connection between the low-pressure oil tank and the high-pressure oil tank. When the solenoid valve fails, the oil in the high-pressure oil tank cannot return to the low-pressure oil tank, causing the pushing system to get stuck underground; an external force can be applied to the low-pressure oil tank to the left, and a relative force will appear between the low-pressure oil tank and the high-pressure oil tank, and this force will all be applied to the shear pin. When the force acting on the shear pin is greater than the shearing pressure of the shear pin, the shear pin will be broken, so that the low-pressure oil tank and the high-pressure oil tank are relatively separated, the low-pressure oil tank moves to the left, and the load-bearing pin screw 2 moves to the leftmost end of the waist-shaped groove (see Figure 4a , b), and at the same time, the hydraulic pump is driven to move to the left, the high-pressure channel of the hydraulic pump 6 is separated from the oil channel, the low-pressure oil tank is connected with the high-pressure oil tank, the oil in the high-pressure oil tank flows to the low-pressure oil tank, and the oil pressure in the high-pressure oil tank is reduced, thereby effectively avoiding the high-pressure oil tank from getting stuck underground.

[0022] The shear pins of the present invention can be provided with 1-4, and the shear pins are cylindrical copper materials, one end of which is in the round hole of the low-pressure oil tank shell, and the other end is fixed to the high-pressure oil tank with a nut. When each shear pin is subjected to a force of 600kg, it will break.

[0023] When the present invention is used for oil filling, the oil filling hole 12 is connected to a pressure pump to pressurize the hydraulic oil into the low-pressure oil tank. The oil outlet hole 16 is connected to a vacuum pump to evacuate the high-pressure oil tank to ensure that there is as little air as possible inside the high-pressure oil tank. The one-way valve connects the low-pressure oil tank and the high-pressure oil tank, and the injected hydraulic oil passes through the oil inlet hole 12, the low-pressure oil tank, the oil circuit of the one-way valve and the solenoid valve, and the oil passage 16 into the high-pressure oil tank. After the oil filling is completed, the top screws on the oil inlet hole and the oil outlet hole are installed.

[0024] The oil inlet hole 12, the low-pressure oil tank, the two oil paths 11 in the hydraulic pump, the one-way valve, the oil path of the solenoid valve, the oil path 16, the high-pressure oil tank 11 and the oil outlet hole 15 are connected to form the entire oil path 18.

[0025] The one-way valve 8 adopts the present invention. When filling oil, there is no need to remove the safety pin, and there is no need to use external force to separate the low-pressure oil tank 1 from the high-pressure oil tank 11. There is no need to use external force to close the low-pressure oil tank and the high-pressure oil tank after filling oil. The filling process is simple and the effect is good.

Claims

1. The hydraulic push-pull oil filling device of the cable logging tractor is free of disassembly. The low-pressure oil tank has an oil inlet hole, and the high-pressure oil tank has an oil outlet hole. The low-pressure oil tank and the high-pressure oil tank are connected as a whole by a bearing pin screw, and a sealing ring is provided at the connection. The bearing pin screw is located at the rightmost side of the waist-shaped groove of the high-pressure oil tank, and the lower end is connected to the low-pressure oil tank screw buckle. The bearing pin screw can move axially in the waist-shaped groove. The hydraulic pump screw fixes the hydraulic pump on the low-pressure oil tank, and the high-pressure output channel of the hydraulic pump is inserted into the push-pull system, and the push-pull system is in the high-pressure oil tank. The hydraulic pump divides the low-pressure oil tank into two parts, and the two parts are connected by two oil circuits in the hydraulic pump. There is a sealing ring between the high-pressure output channel of the hydraulic pump and the high-pressure oil tank. It is characterized by: Solenoid valves and one-way valves are installed on both sides of the high-pressure output channel inserted into the high-pressure oil tank. The solenoid valves and one-way valves have oil paths connected to the low-pressure oil tank and the high-pressure oil tank channels.

2. The hydraulic push-pull oil injection device for cable logging tractor according to claim 1 is characterized in that: The opening channel pressure of the one-way valve is 0.5-1psi, and the reverse pressure is 4000psi.

3. The hydraulic push-pull oil injection device for cable logging tractor according to claim 1 is characterized in that: The opening channel of the solenoid valve is energized with 24V DC, and it will automatically close when the power is cut off.

4. The hydraulic push-pull oil injection device for cable logging tractor according to claim 1 is characterized in that: A shear pin is provided at the connection between the low-pressure oil tank and the high-pressure oil tank.

5. The hydraulic push-pull oil injection device for cable logging tractor according to claim 4 is characterized in that: There are 1 to 4 shear pins, which are cylindrical copper pins.

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