阅读说明：本技术 一种旋挖钻机主卷扬系统 (Main hoisting system of rotary drilling rig ) 是由 张忠海 张永华 孙余 刘志刚 单昌猛 马旭 马滔 郜星 单俊云 张宗阳 于 2021-03-25 设计创作，主要内容包括：本发明公开了一种旋挖钻机主卷扬系统,采用闭式回路,吸收主卷扬下放时钻杆的重力势能,降低了发动机的负载率,为发动机节省燃油消耗。该系统包括发动机、分动箱、闭式主泵、开式主泵、补油泵、单向阀、溢流阀、防爆阀、主卷扬马达、两个电磁阀、压力传感器、冲洗阀、两个溢流阀。其中发动机与分动箱输入端连接,分动箱输出端分别与闭式主泵、开式主泵连接。闭式主泵的A口与主卷扬马达的A口连接,闭式主泵的B口与防爆阀的1口连接,防爆阀的2口与主卷扬马达的B口连接。补油泵依次与溢流阀、单向阀、闭式主泵的A/B口连接。(The invention discloses a main winch system of a rotary drilling rig, which adopts a closed loop to absorb the gravitational potential energy of a drill rod when a main winch is put down, thereby reducing the load rate of an engine and saving fuel consumption for the engine. The system comprises an engine, a transfer case, a closed main pump, an open main pump, an oil replenishing pump, a one-way valve, an overflow valve, an explosion-proof valve, a main hoisting motor, two electromagnetic valves, a pressure sensor, a flushing valve and two overflow valves. The engine is connected with the input end of the transfer case, and the output end of the transfer case is connected with the closed main pump and the open main pump respectively. The port A of the closed main pump is connected with the port A of the main hoisting motor, the port B of the closed main pump is connected with the port 1 of the explosion-proof valve, and the port 2 of the explosion-proof valve is connected with the port B of the main hoisting motor. The oil replenishing pump is sequentially connected with the overflow valve, the one-way valve and the A/B port of the closed main pump.)

1. The utility model provides a dig rig owner hoist system soon which characterized in that: the transfer case comprises an engine (1), a transfer case (2), a closed main pump (3), an open main pump (4), an oil supplementing pump (5), a one-way valve (6), an overflow valve I (7), an explosion-proof valve (8), a main hoisting motor (9), two electromagnetic valves (10), a pressure sensor (11), a flushing valve (12) and two overflow valves II (13); the engine (1) is connected with the input end of the transfer case (2), and the output end of the transfer case (2) is respectively connected with the closed main pump (3) and the open main pump (4); the port A of the closed main pump (3) is connected with the port A of the main hoisting motor (9), the port B of the closed main pump (3) is connected with the port 1 of the explosion-proof valve (8), and the port 2 of the explosion-proof valve (8) is connected with the port B of the main hoisting motor (9); and the oil supplementing pump (5) is sequentially connected with the overflow valve I (7), the one-way valve (6) and an A/B port of the closed main pump (3).

2. The main hoisting system of the rotary drilling rig according to claim 1, wherein: two oil inlets of the flushing valve (12) are respectively connected with an A, B port of the main hoisting motor (9), and an oil return port of the flushing valve (12) is connected with an oil tank.

3. The main hoisting system of the rotary drilling rig according to claim 1, wherein: an A, B port of the main hoisting motor (9) is respectively connected with two overflow valves II (13).

4. The main hoisting system of the rotary drilling rig for the scale according to claim 1, wherein: the port 3 of the explosion-proof valve (8) is connected with the oil outlet of one of the electromagnetic valves (10), and the pressure sensor (11) is connected with a port B pipeline of the main pump (3).

5. The main hoisting system of the rotary drilling rig according to claim 1, wherein: an oil outlet of the other electromagnetic valve (10) is connected with a control port of a main hoisting brake.

6. The main hoisting system of the rotary drilling rig according to claim 1, wherein: and the pressure sensor (11) is connected with a pipeline at the port B of the closed main pump (3).

Technical Field

The invention relates to the technical field of rotary drilling rigs, in particular to a main hoisting system of a rotary drilling rig.

Background

The rotary drilling rig is piling machinery used for hole forming operation, after a drill bit is full of soil, a drill rod and the drill bit need to be lifted out of a hole by using a main winch, and after the soil is poured out, the drill rod and the drill bit are placed into the hole again by using the main winch. The weight of the drill rod generally reaches several tons and more than ten tons, and the drill rod is repeatedly lifted and lowered in the hole, so that the energy consumed by lifting and the energy released by lowering are very large. At present, a main hoisting system of the rotary drilling rig adopts an open system, namely oil is supplied to a multi-way valve by a hydraulic pump, the multi-way valve supplies pressure oil to a main hoisting motor, and return oil of the main hoisting motor flows back to an oil tank through the multi-way valve. A balance valve is generally installed at an oil port on a load side of a main winch motor to prevent the main winch from stalling under the action of the gravity of a drill rod. In the process of lowering the main winch, the balance valve is opened, load side pressure oil of a main winch motor forms certain back pressure through the balance valve to balance the weight of the drill rod, but the gravitational potential energy of the drill rod is lost in a throttling mode of the balance valve, throttling heating is also brought, and the heat load of the system is increased. Therefore, if the lost energy can be utilized to provide power for other elements, the rotary drilling machine can achieve considerable energy-saving effect.

Disclosure of Invention

The invention aims to provide a main hoisting system of a rotary drilling rig, and provides a more energy-saving main hoisting system of the rotary drilling rig.

In order to achieve the purpose, the main hoisting system of the rotary drilling rig comprises an engine, a transfer case, a closed main pump, an open main pump, an oil supplementing pump, a one-way valve, an overflow valve, an explosion-proof valve, a main hoisting motor, two electromagnetic valves, a pressure sensor, a flushing valve and two overflow valves; the engine is connected with the input end of the transfer case, and the output end of the transfer case is respectively connected with the closed main pump and the open main pump; the port A of the closed main pump is connected with the port A of the main hoisting motor, the port B of the closed main pump is connected with the port 1 of the explosion-proof valve, and the port 2 of the explosion-proof valve is connected with the port B of the main hoisting motor; the oil replenishing pump is sequentially connected with the overflow valve, the one-way valve and an A/B port of the closed main pump.

Furthermore, two oil inlets of the flushing valve are respectively connected with an A, B port of the main hoisting motor, and an oil return port of the flushing valve is connected with an oil tank.

Furthermore, an A, B port of the main hoisting motor is respectively connected with two overflow valves.

Furthermore, the 3 ports of the explosion-proof valve are connected with an oil outlet of one electromagnetic valve, and the pressure sensor is connected with a pipeline of the B port of the main pump.

Further, an oil outlet of the other electromagnetic valve is connected with a control port of the main hoisting brake.

Further, the pressure sensor is connected with a pipeline of a port B of the closed main pump.

The invention has the beneficial effects that: the rotary drilling rig main winch system adopts a closed loop, the lifting and the lowering of a main winch are controlled by directly utilizing a closed main pump, and the rotary drilling rig main winch system has the advantages that when the rotary drilling rig main winch system is lowered, pressure oil on the load side of a main winch motor reacts on the closed main pump to form certain anti-dragging torque, and reacts on an engine output shaft, so that the load rate of an engine is greatly reduced, and fuel consumption is saved for the engine. Meanwhile, a multi-way valve and a balance valve do not exist between the pump and the motor, throttling heating caused by local pressure loss on the valve does not exist, and the heat load of the system is greatly reduced. And secondly, under the conditions of too low pressure or burst pipeline and the like, the anti-explosion valve can be used for locking the load side pressure oil of the main winch motor, so that the main winch is prevented from slipping off the rod, and the safety and the reliability are realized.

Drawings

FIG. 1 is a schematic structural view of the present invention;

in the figure, 1-an engine, 2-a transfer case, 3-a closed main pump, 4-an open main pump, 5-an oil supplementing pump, 6-a one-way valve, 7-an overflow valve I, 8-an explosion-proof valve, 9-a main hoisting motor, 10-an electromagnetic valve, 11-a pressure sensor, 12-a flushing valve and 13-an overflow valve II.

Detailed Description

The invention is described in further detail below with reference to the figures and the embodiments.

As shown in fig. 1, a main hoisting system of a rotary drilling rig comprises an engine 1, a transfer case 2, a closed main pump 3, an open main pump 4, an oil supplementing pump 5, a one-way valve 6, an overflow valve I7, an explosion-proof valve 8, a main hoisting motor 9, two electromagnetic valves 10, a pressure sensor 11, a flushing valve 12 and an overflow valve II 13. Wherein engine 1 is connected with transfer case 2 input, and transfer case 2 output is connected with closed main pump 3, open main pump 4 respectively, and open main pump 4 is used for other hydraulic system. When the main winch performs lifting action, the closed main pump 3 outputs power to the main winch motor 9. When the main winch performs downward releasing action, pressure oil on the load side of a motor of the main winch reacts on the closed main pump 4 to form certain anti-dragging torque, and the anti-dragging torque reacts on an output shaft of the engine to reduce the load of the engine. In order to prevent the engine from generating the back-dragging overspeed phenomenon, the output torque of the open main pump 4 can be actively controlled to balance the residual back-dragging torque.

The A mouth of closed main pump 3 is connected with the A mouth of main hoist motor 9, and the B mouth of closed main pump 3 is connected with 1 mouth of explosion-proof valve 8, and 2 mouths of explosion-proof valve 8 are connected with the B mouth of main hoist motor 9, have formed closed main hoist return circuit like this, through the sloping cam plate angle that changes closed main pump 3, realize the switching-over and the volume speed governing of main hoist.

The oil supplementing pump 5 is sequentially connected with the overflow valve I7, the check valve 6 and the A/B port of the closed main pump 3, and provides oil supplementing for the A or B port of the closed main pump 3.

Two oil inlets of the flushing valve 12 are respectively connected with an A, B port of the main hoisting motor 9, an oil return port of the flushing valve 12 is connected with an oil tank, and high-temperature oil at the port A or the port B of the main hoisting motor 9 can flow back to the oil tank to play a cooling role.

The A, B port of the main hoisting motor 9 is respectively connected with two overflow valves II13, which can play a role of safety protection.

The port 3 of the explosion-proof valve 8 is connected with an oil outlet of an electromagnetic valve 10, and the pressure sensor 11 is connected with a pipeline of the port B of the main pump 3 and used for controlling the opening and closing of the explosion-proof valve 8.

An oil outlet of the other electromagnetic valve 10 is connected with a control port of the main winch brake and used for controlling the opening and closing of the main winch.

The pressure sensor 11 is connected with a pipeline of the port B of the closed main pump 3 and is used for detecting the pressure of the port B of the closed main pump 3. When the pressure is too low or the pipeline bursts, the electromagnetic valve 10 is controlled to be electrified, so that the explosion-proof valve 8 acts, the load side pressure oil of the main winch motor 9 is locked, and the phenomenon that the main winch slips off the rod is prevented.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto, and various changes which can be made within the knowledge of those skilled in the art without departing from the gist of the present invention are within the scope of the claims of the present invention.