Search

CN-121976979-A - Auxiliary oil return control system and method and drilling machine

CN121976979ACN 121976979 ACN121976979 ACN 121976979ACN-121976979-A

Abstract

The application discloses an auxiliary oil return control system, an auxiliary oil return control method and a drilling machine in the technical field of engineering machinery, and aims to solve the problems that in the prior art, a pressure holding phenomenon often occurs, dangers are brought to the working of the drilling machine, and the safety of the system is affected. The hydraulic control system comprises a main valve and a pump, wherein an A port of the main valve is simultaneously connected with a rod cavity of a first oil cylinder and a rod cavity of a second oil cylinder, a B port of the main valve is simultaneously connected with a rod-free cavity of the first oil cylinder and a rod-free cavity of the second oil cylinder, a control assembly comprises a P2 port, an A1 port and a B port, the P port of the pump is connected with the P2 port, the rod-free cavity of the first oil cylinder and the rod-free cavity of the second oil cylinder are both connected with the A1 port, and the A1 port and the B port of the control assembly are communicated.

Inventors

  • GUO TIEKUN
  • ZHANG TENG
  • LI JING

Assignees

  • 徐州徐工基础工程机械有限公司

Dates

Publication Date
20260505
Application Date
20260323

Claims (10)

  1. 1. An auxiliary oil return control system is characterized by comprising a main valve (10) and a pump (8), wherein an A port of the main valve (10) is simultaneously connected with a rod cavity of a first oil cylinder (11) and a rod cavity of a second oil cylinder (12), and a B port of the main valve (10) is simultaneously connected with a rodless cavity of the first oil cylinder (11) and a rodless cavity of the second oil cylinder (12); The control assembly comprises a P2 port, an A1 port and a B port, wherein the P port of the pump (8) is connected with the P2 port, a rodless cavity of the first oil cylinder (11) and a rodless cavity of the second oil cylinder (12) are connected with the A1 port, the B port is connected with the oil tank (7), and the pump (8) is used for controlling the on-off of the A1 port and the B port.
  2. 2. The auxiliary oil return control system according to claim 1, wherein the control assembly further comprises a solenoid valve (13), a pilot operated directional valve (14) and a t port, the t port is connected with the oil tank (7), a first port of the pilot operated directional valve (14) is connected with the A1 port, a second port of the pilot operated directional valve (14) is connected with the B port, a first port of the solenoid valve (13) is connected with the P2 port, a second port of the solenoid valve (13) is connected with the t port, a third port of the solenoid valve (13) is connected with a control port of the pilot operated directional valve (14), and an oil return port of the solenoid valve (13) is connected with the t port.
  3. 3. Auxiliary oil return control system according to claim 1, characterized in that the P port of the pump (8) is connected to the P2 port by means of a pressure reducing valve (9).
  4. 4. The auxiliary oil return control system according to claim 2, wherein the rodless cavity of the first oil cylinder (11) and the rodless cavity of the second oil cylinder (12) are both connected with the sensor (2).
  5. 5. The auxiliary oil return control system according to claim 4, further comprising an electrical control system comprising a controller (1) and a handle (3), wherein the sensor (2) and the handle (3) are both electrically connected to the controller (1).
  6. 6. The auxiliary oil return control system according to claim 5, wherein a coil (6) for controlling the valve core of the electromagnetic valve (13) to change direction is arranged in the electromagnetic valve (13), and the coil (6) is electrically connected with the controller (1).
  7. 7. The auxiliary oil return control system according to claim 5, wherein the handle (3) is provided with a first button (4) and a second button (5), and the first button (4) and the second button (5) are electrically connected with the controller (1).
  8. 8. An auxiliary oil return control method based on the auxiliary oil return control system according to any one of claims 5 to 7, characterized by comprising a rise control; The ascent control includes: the staff pushes the handle (3) forwards; The main valve (10) outputs oil to the rodless cavity of the first oil cylinder (11) and the rodless cavity of the second oil cylinder (12), and the oil in the rod cavity of the first oil cylinder (11) and the rod cavity of the second oil cylinder (12) flows into the main valve (10) to finish ascending control.
  9. 9. The auxiliary oil return control method according to claim 8, characterized by further comprising a descent control; the descent control includes: the staff pushes the handle (3) backwards; The main valve (10) outputs oil to a rod cavity of the first oil cylinder (11) and a rod cavity of the second oil cylinder (12); The controller (1) controls the valve core of the electromagnetic valve (13) to change direction; the oil output by the pump (8) flows into a control port of the hydraulically-controlled reversing valve (14) through the electromagnetic valve (13), so that the port A1 is communicated with the port B; Part of oil in the rodless cavity of the first oil cylinder (11) and part of oil in the rodless cavity of the second oil cylinder (12) flow into the main valve (10), and the other part of oil in the rodless cavity of the first oil cylinder (11) and the rodless cavity of the second oil cylinder (12) flow into the oil tank (7) through the port A1 and the port B, so that descending control is completed.
  10. 10. A drilling rig comprising an auxiliary oil return control system as claimed in any one of claims 1 to 7.

Description

Auxiliary oil return control system and method and drilling machine Technical Field The invention relates to an auxiliary oil return control system, an auxiliary oil return control method and a drilling machine, and belongs to the technical field of engineering machinery. Background The deep well drilling machine is special equipment for shallow resource exploitation, is mainly used for drilling exploitation of resources such as coal bed gas, shale gas, shallow petroleum, geothermal energy, underground water and the like, has the advantages of large hole diameter and high drilling efficiency, and is also applied to special occasions such as mine rescue, gas extraction and the like. The drilling tower mainly comprises an inner layer drilling tower, an outer layer drilling tower, a pulley yoke, a back sliding frame and the like, the inner layer drilling tower and the outer layer drilling tower relatively slide under the action of a feeding oil cylinder, a moving slideway of a power head is arranged on the inner layer drilling tower, the feeding oil cylinder provides lifting and downward pressure for the power head through a top pulley and a steel wire rope, and the back sliding frame is a guide mechanism for the whole drilling tower to move up and down. The top driving force head drives the drilling tools such as a drill bit, a drill rod and the like to rotate while moving up and down on the drilling tower under the action of the hydraulic oil cylinder and the steel wire rope, the rock stratum is cut and broken, rock drilling and hole forming are realized, the air/slurry manifold is externally used for discharging rock scraps in the well to the ground surface through pressure by means of an air compressor or a slurry pump, and the drilling depth is from hundreds of meters to more than 3000 meters. The applicant research finds that the drilling machine has the following problems in the construction process: In the control system of the prior art, after a well is drilled, a drill rod in the well needs to be detached, in order to improve the working efficiency, a power head needs to be rapidly operated downwards from the top of a drilling tower so as to be connected with the drill rod in the well, at the moment, a drilling tower oil cylinder is provided with a rod cavity (small cavity) for oil feeding, a rod cavity (large cavity) for oil returning is omitted, the power head is placed downwards, particularly when rapidly placed downwards, a pressure holding phenomenon often occurs, even if a feeding handle returns to the middle position, the power head still can be operated upwards for a certain distance after stopping, danger is brought to the work of a drilling machine, and the safety of the system is affected. Disclosure of Invention The application aims to overcome the defects in the prior art, and provides an auxiliary oil return control system, an auxiliary oil return control method and a drilling machine, wherein a pump is matched with a control component, when oil is fed into rod cavities of a first oil cylinder and a second oil cylinder, and oil is returned from a rodless cavity, an A1 port and a B port of the control component are communicated, so that part of oil in the rodless cavity of the first oil cylinder and the rodless cavity of the second oil cylinder flows into an oil tank through the control component, stable outflow of the oil is ensured, a pressure-holding condition is prevented, and stability and safety of the oil pump in working are ensured. In order to solve the technical problems, the invention is realized by adopting the following technical scheme: In a first aspect, the invention provides an auxiliary oil return control system, which comprises a main valve and a pump, wherein an A port of the main valve is simultaneously connected with a rod cavity of a first oil cylinder and a rod cavity of a second oil cylinder, and a B port of the main valve is simultaneously connected with a rodless cavity of the first oil cylinder and a rodless cavity of the second oil cylinder; the control assembly comprises a P2 port, an A1 port and a B port, wherein the P port of the pump is connected with the P2 port, a rodless cavity of the first oil cylinder and a rodless cavity of the second oil cylinder are both connected with the A1 port, the B port is connected with the oil tank, and the pump is used for controlling the on-off of the A1 port and the B port. Further, the control assembly further comprises an electromagnetic valve, a hydraulic control reversing valve and a t port, the t port is connected with the oil tank, a first port of the hydraulic control reversing valve is connected with the A1 port, a second port of the hydraulic control reversing valve is connected with the B port, a first port of the electromagnetic valve is connected with the P2 port, a second port of the electromagnetic valve is connected with the t port, a third port of the electromagnetic valve is connected with a control por