阅读说明：本技术 一种旋挖钻机二级加压电液控制系统和控制方法 (Two-stage pressurization electro-hydraulic control system and control method for rotary drilling rig ) 是由 马少焱 黎起富 滕召金 罗瑶 吴江苏 易炜 湛良传 宁焕 于 2021-09-14 设计创作，主要内容包括：本发明公开了一种旋挖钻机二级加压电液控制系统和控制方法,控制系统包括第一先导控制阀、第二先导控制阀、选择阀、主阀副卷联、辅阀加压联、副卷扬马达、加压油缸、油箱和先导泵。本发明的旋挖钻机二级加压电液控制系统,能很好的解决在动力头扭矩较小的情况下动力头与加压复合动作快速钻进,当遇到岩层等扭矩较大的情况下需要间断加压钻进,当遇到硬层导致扭矩剧增的时候能够及时将加压油缸瞬间缩回降低扭矩避免动力头卡死,而空长行程阶段又能够使油缸全速快速伸出或缩回,提高了工作效率；使得其它动作协调可靠,解决了加压油缸与主卷扬动力头及上车回转等同时运动做复合动作等的问题,满足实际需求。(The invention discloses a two-stage pressurization electro-hydraulic control system and a control method for a rotary drilling rig. The two-stage pressurizing electro-hydraulic control system of the rotary drilling rig can well solve the problems that the power head and pressurizing composite action is fast drilled under the condition that the torque of the power head is small, intermittent pressurizing drilling is needed under the condition that the torque is large such as rock strata, the pressurizing oil cylinder can be instantly retracted to reduce the torque to avoid the power head from being blocked when the torque is greatly increased due to a hard layer, and the oil cylinder can be rapidly extended or retracted at full speed at the idle long stroke stage, so that the working efficiency is improved; other actions are coordinated and reliable, the problem that the pressurizing oil cylinder, the main hoisting power head, the boarding rotation and the like move simultaneously to perform composite actions is solved, and the actual requirements are met.)

1. A two-stage pressurization electro-hydraulic control system of a rotary drilling rig is characterized by comprising a first pilot control valve (1), a second pilot control valve (2), a selection valve (3), a main valve auxiliary winding unit (4), an auxiliary valve pressurization unit (5), an auxiliary winding motor (6), a pressurization oil cylinder (7), an oil tank (8) and a pilot pump (9); a first oil inlet, a second working oil port, a first working oil port and a second working oil port of the first pilot control valve (1) are respectively communicated with a first pressurizing handle control oil port, a third pressurizing handle control oil port, a first control end of the auxiliary valve pressurizing joint (5) and a first control end of the main valve auxiliary coiling joint (4);

a first oil inlet, a second working oil port, a first working oil port and a second working oil port of the second pilot control valve (2) are respectively communicated with a second pressurization handle control oil port, a fourth pressurization handle control oil port, a second control end of the auxiliary valve pressurization joint (5) and a second control end of the main valve auxiliary coiling joint (4);

the selector valve (3) comprises a two-position six-way hydraulic control reversing valve (3.1) and a third electromagnetic reversing valve (3.2), a first control port and a second control port of the two-position six-way hydraulic control reversing valve (3.1) are respectively communicated with a first working oil port and a second working oil port of the third electromagnetic reversing valve (3.2), a first working oil port and a second working oil port of the two-position six-way hydraulic control reversing valve (3.1) are respectively communicated with a first oil port and a second oil port of the auxiliary hoisting motor (6), and a third working oil port and a fourth working oil port of the two-position six-way hydraulic control reversing valve (3.2) are respectively communicated with a rod cavity and a rodless cavity of the pressurizing oil cylinder (7); an oil inlet of the third electromagnetic directional valve (3.2) is communicated with an oil outlet of the pilot pump (9);

an oil inlet of the main valve auxiliary rolling connection (4) is communicated with an oil inlet of the main oil pump, and a first working oil port and a second working oil port of the main valve auxiliary rolling connection (4) are respectively communicated with a first oil inlet and a second oil inlet of the two-position six-way hydraulic control reversing valve (3.1);

an oil inlet of the auxiliary valve pressurization linkage (5) is communicated with an oil inlet of an auxiliary oil pump, and a first working oil port and a second working oil port of the auxiliary valve pressurization linkage (5) are respectively communicated with a rodless cavity and a rod cavity of the pressurization oil cylinder (7);

the two-position six-way hydraulic control reversing valve (3.1) can be selectively switched between the working position of the auxiliary hoisting motor and the working position of the pressurizing oil cylinder under the action of a pilot control signal of the third electromagnetic reversing valve (3.2); when the auxiliary hoisting motor is located at the working position, a first oil inlet and a second oil inlet of the two-position six-way hydraulic control reversing valve (3.1) are respectively communicated with a first working oil port and a second working oil port, so that the hoisting action or the lowering action of the auxiliary hoisting motor (6) is realized; when the hydraulic control reversing valve is located at the working position of the pressurizing oil cylinder, the first oil inlet and the second oil inlet of the two-position six-way hydraulic control reversing valve (3.1) are respectively communicated with the third working oil port and the fourth working oil port, and the pressurizing oil cylinder (7) is quickly lifted or quickly lowered.

2. The two-stage pressurization electrohydraulic control system according to claim 1, wherein the first pilot control valve (1) comprises a first electromagnetic directional valve (1.1) and a first shuttle valve (1.2), an oil inlet of the first electromagnetic directional valve (1.1) is a first oil inlet of the first pilot control valve (1), a first working oil port of the first electromagnetic directional valve (1.1) is a first working oil port of the first pilot control valve (1), a second working oil port of the first electromagnetic directional valve (1.1) is connected with an oil inlet of the first shuttle valve (1.2), another oil inlet of the first shuttle valve (1.2) is a second oil inlet of the first pilot control valve (1), and an oil outlet of the first shuttle valve (1.2) is a second working oil port of the first pilot control valve (1).

3. The two-stage pressurization electrohydraulic control system according to claim 2, wherein the second pilot control valve (2) comprises a second electromagnetic directional valve (2.1) and a second shuttle valve (2.2), an oil inlet of the second electromagnetic directional valve (2.1) is a first oil inlet of the second pilot control valve (2), a first working oil port of the second electromagnetic directional valve (2.1) is a first working oil port of the second pilot control valve (2), a second working oil port of the second electromagnetic directional valve (2.1) is connected with an oil inlet of the second shuttle valve (2.2), another oil inlet of the second shuttle valve (2.2) is a second oil inlet of the second pilot control valve (2), and an oil outlet of the second shuttle valve (2.2) is a second working oil port of the second pilot control valve (2).

4. The two-stage pressurization electrohydraulic control system according to claim 1, characterized in that the main valve secondary winding unit (4) is further connected with a pressure compensator (10), and hydraulic oil entering the main valve secondary winding unit (4) from the main oil pump is regulated by the pressure compensator (10) and then reaches the first working oil port or the second working oil port of the two-position six-way hydraulic control directional control valve (3.1).

5. The two-stage pressurization electrohydraulic control system of claim 1, characterized in that the control system further comprises a balance valve (11), and the balance valve is respectively connected with a third working oil port of the two-position six-way hydraulic control directional valve (3.1) and a rod cavity of the pressurization oil cylinder (7).

6. The two-stage pressurization electrohydraulic control system according to claim 1, characterized in that oil return ports of the first pilot control valve (1), the second pilot control valve (2), the third electromagnetic directional valve (3.2), the main valve auxiliary winding joint (4), the auxiliary valve pressurization joint (5), the auxiliary winding motor (6) and the pressurization oil cylinder (7) are all connected with the oil tank (8).

7. The two-stage pressurization electrohydraulic control system according to claim 6, characterized in that a filter (12) is arranged on a pipeline connecting an oil inlet of the pilot pump (9) and the oil tank (8); and a filter (12) is also arranged on a pipeline connecting an oil return port of the main valve auxiliary winding joint (4), an oil return port of the auxiliary valve pressurizing joint (5), an oil return port of the auxiliary winding motor (6) and an oil return port of the pressurizing oil cylinder (7) with the oil tank (8).

8. A two-stage pressurization electro-hydraulic control method of a rotary drilling rig is characterized in that the two-stage pressurization electro-hydraulic control system according to any one of claims 1 to 7 is used for controlling the rotary drilling rig, and in the idle and long stroke of a pressurization oil cylinder (7), the working oil way of an auxiliary hoisting motor (6) is switched to the pressurization oil cylinder (7) for rapid pressurization; the control method comprises the following steps: when rapid pressurization is to be realized, the right handle is pressed, and the right handle compound button is pressed at the same time, so that the first electromagnetic directional valve (1.1), the second electromagnetic directional valve (2.1) and the third electromagnetic directional valve (3.2) are simultaneously electrified; the first electromagnetic directional valve (1.1) and the third electromagnetic directional valve (3.2) are electrified to realize the switching of pressurization and auxiliary winding pilot lifting and lowering, namely, the lifting and lowering of the auxiliary valve pressurization linkage (5) return pilot oil and return an oil tank (8), the auxiliary valve pressurization linkage (5) does not work, an auxiliary oil pump is in a standby state of not working, and the pressurization pilot oil inlet or return oil of a right handle is communicated with the pilot control of the main valve auxiliary winding linkage (4) through the first electromagnetic directional valve (1.1) and the third electromagnetic directional valve (3.2); the second electromagnetic reversing valve (2.1) is electrified, so that the two-position six-way electro-hydraulic reversing valve (3.1) is reversed, and the switching of a working oil way in the main oil way is realized; when a first oil inlet of the two-position six-way electro-hydraulic directional valve (3.1) is communicated with a third working oil port, hydraulic oil of a main oil pump reaches a rod cavity of a pressurizing oil cylinder (7), so that the pressurizing oil cylinder is quickly lifted; when a second oil inlet of the two-position six-way electro-hydraulic reversing valve (3.1) is communicated with a fourth working oil port, hydraulic oil of the main oil pump reaches a rodless cavity of the pressurizing oil cylinder, and the pressurizing oil cylinder is quickly placed.

9. The two-stage pressurization electro-hydraulic control method according to claim 8, characterized in that, in normal operation, the first electromagnetic directional valve (1.1), the second electromagnetic directional valve (2.1) and the third electromagnetic directional valve (3.2) are de-energized; when the right handle is pressed down, the pilot oil inlet is communicated with a first pressurizing handle control oil port, the auxiliary valve pressurizing connection (5) acts to realize reversing, the auxiliary pump oil inlet reaches a rodless cavity of the pressurizing oil cylinder (7) through a first working oil port of the auxiliary valve pressurizing connection, and the normal idle stroke slow-speed lowering or pressurizing action of the pressurizing oil cylinder is realized; when the right handle is lifted upwards, the pilot oil inlet is communicated with a second pressurizing handle control oil port, the auxiliary valve pressurizing linkage (5) acts to realize reversing, the auxiliary pump oil inlet reaches the rod cavity of the pressurizing oil cylinder (7) from a second working oil port of the auxiliary valve pressurizing linkage (5), and the normal idle stroke of the pressurizing oil cylinder is lifted at a low speed or the drilling rod is lifted in an auxiliary mode.

10. The two-stage pressurization electrohydraulic control method according to claim 9, characterized in that when the left handle is lifted upwards and the auxiliary winding button is pressed simultaneously, pilot pressure oil enters the handle to a second pressurization handle control oil port, then enters the main valve auxiliary winding link (4) through a second shuttle valve (2.2) for pilot control, so that a valve core of the main valve auxiliary winding link (4) moves and reverses, main oil pump oil enters the main valve auxiliary winding link (4) and a pressure compensator (10), then reaches a first oil inlet of a two-position six-way hydraulic control reversing valve (3.1), finally reaches a second oil port of an auxiliary winding motor (6) through a first working oil port of the two-position six-way hydraulic control reversing valve (3.1), and the auxiliary winding motor rotates to drive a speed reducer to rotate so that the auxiliary winding realizes lifting action; when a left handle is pressed down and an auxiliary winding button is pressed simultaneously, a pilot pressure oil inlet handle reaches a fourth pressurizing handle control oil port, then enters a main valve auxiliary winding (4) through a first shuttle valve (1.2) to be subjected to pilot control, so that a valve core of the main valve auxiliary winding (4) is moved and reversed, a main oil pump oil inlet reaches a second oil inlet of a two-position six-way hydraulic control reversing valve (3.1) after passing through the main valve auxiliary winding (4) and a pressure compensator (10), and finally reaches a first oil port of an auxiliary winding motor (6) through a second working oil port of the two-position six-way hydraulic control reversing valve (3.1), and the auxiliary winding motor rotates to drive a speed reducer to rotate so that the auxiliary winding is lifted to realize lowering.

Technical Field

The invention relates to the technical field of piling machinery control, in particular to a two-stage pressurization electro-hydraulic control system and a control method for a rotary drilling rig.

Background

The rotary drilling rig is a construction machine for boring operation in building foundation engineering. In order to realize the pressurized drilling of the drilling tool, the rotary drilling rig needs to be provided with a pressurizing component, and a pressurizing device transmits pressurizing force to the drill rod drilling tool through a power head. According to the type of the pressurizing component, the pressurizing component can be divided into oil cylinder pressurizing and hoisting pressurizing. The oil cylinder pressurization means that pressurization drilling is realized by arranging a pressurization oil cylinder, and the application is wide. The stroke of a pressurizing oil cylinder of the rotary drilling rig is long, an auxiliary oil pump with small flow is adopted as a power source of the pressurizing oil cylinder of the conventional rotary drilling rig, and the flow of the auxiliary oil pump is only half of that of a main pump, so that the rotary drilling rig is low in running speed within a range of several meters of idle stroke and low in working efficiency. Therefore, the existing pressurization control system of the rotary drilling rig cannot meet the construction requirements of power head drilling and the like.

Disclosure of Invention

The invention aims to provide a two-stage pressurization electro-hydraulic control system of a rotary drilling rig, which aims to solve the problems in the background technology.

In order to achieve the aim, the invention provides a two-stage pressurization electro-hydraulic control system of a rotary drilling rig, which comprises a first pilot control valve, a second pilot control valve, a selection valve, a main valve auxiliary winding unit, an auxiliary valve pressurization unit, an auxiliary winding motor, a pressurization oil cylinder, an oil tank and a pilot pump, wherein the main valve auxiliary winding unit is connected with the main valve auxiliary winding unit; the first oil inlet, the second working oil port, the first working oil port and the second working oil port of the first pilot control valve are respectively communicated with the first pressurizing handle control oil port, the third pressurizing handle control oil port, the first control end of the auxiliary valve pressurizing joint and the first control end of the main valve auxiliary coiling joint;

a first oil inlet, a second working oil port, a first working oil port and a second working oil port of the second pilot control valve are respectively communicated with a second pressurizing handle control oil port, a fourth pressurizing handle control oil port, a second control end of the auxiliary valve pressurizing joint and a second control end of the main valve auxiliary rolling joint;

the selector valve comprises a two-position six-way hydraulic control reversing valve and a third electromagnetic reversing valve, a first control port and a second control port of the two-position six-way hydraulic control reversing valve are respectively communicated with a first working oil port and a second working oil port of the third electromagnetic reversing valve, the first working oil port and the second working oil port of the two-position six-way hydraulic control reversing valve are respectively communicated with a first oil port and a second oil port of the auxiliary winch motor, and a third working oil port and a fourth working oil port of the two-position six-way hydraulic control reversing valve are respectively communicated with a rod cavity and a rodless cavity of the pressurizing oil cylinder; an oil inlet of the third electromagnetic directional valve is communicated with an oil outlet of the pilot pump;

the oil inlet of the main valve auxiliary rolling joint is communicated with the oil inlet of the main oil pump, and a first working oil port and a second working oil port of the main valve auxiliary rolling joint are respectively communicated with a first oil inlet and a second oil inlet of the two-position six-way hydraulic control reversing valve;

an oil inlet of the auxiliary valve pressurization link is communicated with an oil inlet of an auxiliary oil pump, and a first working oil port and a second working oil port of the auxiliary valve pressurization link are respectively communicated with a rodless cavity and a rod cavity of the pressurization oil cylinder;

the two-position six-way hydraulic control reversing valve can be selectively switched between the working position of the auxiliary hoisting motor and the working position of the pressurizing oil cylinder under the action of a pilot control signal of the third electromagnetic reversing valve; when the auxiliary hoisting motor is located at the working position of the auxiliary hoisting motor, a first oil inlet and a second oil inlet of the two-position six-way hydraulic control reversing valve are respectively communicated with a first working oil port and a second working oil port, so that the hoisting action or the lowering action of the auxiliary hoisting motor is realized; when the hydraulic control reversing valve is located at the working position of the pressurizing oil cylinder, the first oil inlet and the second oil inlet of the two-position six-way hydraulic control reversing valve are respectively communicated with the third working oil port and the fourth working oil port, and the pressurizing oil cylinder is quickly lifted or quickly lowered.

Further, the first pilot control valve includes a first electromagnetic directional valve and a first shuttle valve, an oil inlet of the first electromagnetic directional valve is a first oil inlet of the first pilot control valve, a first working oil port of the first electromagnetic directional valve is a first working oil port of the first pilot control valve, a second working oil port of the first electromagnetic directional valve is connected with an oil inlet of the first shuttle valve, another oil inlet of the first shuttle valve is a second oil inlet of the first pilot control valve, and an oil outlet of the first shuttle valve is a second working oil port of the first pilot control valve.

Furthermore, the second pilot control valve includes a second electromagnetic directional valve and a second shuttle valve, an oil inlet of the second electromagnetic directional valve is a first oil inlet of the second pilot control valve, a first working oil port of the second electromagnetic directional valve is a first working oil port of the second pilot control valve, a second working oil port of the second electromagnetic directional valve is connected with an oil inlet of the second shuttle valve, another oil inlet of the second shuttle valve is a second oil inlet of the second pilot control valve, and an oil outlet of the second shuttle valve is a second working oil port of the second pilot control valve.

Furthermore, the main valve auxiliary winding unit is also connected with a pressure compensator, and hydraulic oil entering the main valve auxiliary winding unit from the main oil pump reaches the first working oil port or the second working oil port of the two-position six-way hydraulic control reversing valve after being regulated by the pressure compensator.

Furthermore, the control system further comprises a balance valve, and the balance valve is respectively connected with a third working oil port of the two-position six-way hydraulic control reversing valve and a rod cavity of the pressurizing oil cylinder.

Furthermore, the first pilot control valve, the second pilot control valve, the third electromagnetic directional valve, the main valve auxiliary winding unit, the auxiliary valve pressurization unit, the auxiliary winding motor and the oil return port of the pressurization oil cylinder are all connected with the oil tank.

Furthermore, a filter is arranged on a pipeline connecting an oil inlet of the pilot pump and the oil tank; and a filter is also arranged on a pipeline connecting an oil return port of the auxiliary main valve rolling joint, an oil return port of the auxiliary valve pressurizing joint, an oil return port of the auxiliary hoisting motor and an oil return port of the pressurizing oil cylinder with the oil tank.

The invention also provides a two-stage pressurizing electro-hydraulic control method of the rotary drilling rig, the two-stage pressurizing electro-hydraulic control system is used for controlling the rotary drilling rig, and the working oil way of the auxiliary hoisting motor is switched to the pressurizing oil cylinder for rapid pressurizing work in the idle stroke of the pressurizing oil cylinder; the control method comprises the following steps: when rapid pressurization is to be realized, the right handle and the right handle compound button are pressed simultaneously, so that the first electromagnetic directional valve, the second electromagnetic directional valve and the third electromagnetic directional valve are simultaneously electrified; the first electromagnetic directional valve and the third electromagnetic directional valve are electrified to realize the switching of pressurization and auxiliary winding pilot lifting and lowering, namely, the auxiliary valve pressurization linkage lifts and lowers pilot oil and returns to the oil tank at the same time, the auxiliary valve pressurization linkage does not work, the auxiliary oil pump is in a standby state of not working, and the pressurization pilot oil inlet or return oil of the right handle is communicated with the main valve auxiliary winding linkage pilot control through the first electromagnetic directional valve and the third electromagnetic directional valve; the second electromagnetic reversing valve is electrified, so that the two-position six-way electro-hydraulic reversing valve is reversed, and the switching of a working oil way in the main oil way is realized; when a first oil inlet of the two-position six-way electro-hydraulic reversing valve is communicated with a third working oil port, hydraulic oil of a main oil pump reaches a rod cavity of a pressurizing oil cylinder, so that the pressurizing oil cylinder is quickly lifted; when a second oil inlet of the two-position six-way electro-hydraulic reversing valve is communicated with a fourth working oil port, hydraulic oil of the main oil pump reaches a rodless cavity of the pressurizing oil cylinder, and the pressurizing oil cylinder is rapidly lowered.

Further, when the electromagnetic directional control valve works normally, the first electromagnetic directional control valve, the second electromagnetic directional control valve and the third electromagnetic directional control valve are powered off; when the right handle is pressed downwards, the pilot oil inlet is communicated with the first pressurizing handle control oil port, the auxiliary valve is pressurized and linked to realize reversing, the auxiliary pump oil inlet reaches the rodless cavity of the pressurizing oil cylinder through the first working oil port of the auxiliary valve pressurizing and connecting, and the normal idle stroke slow lowering or pressurizing action of the pressurizing oil cylinder is realized; when the right handle is lifted upwards, the pilot oil inlet is communicated with the second pressurizing handle control oil port, the auxiliary valve pressurizing linkage is also made to realize reversing, the auxiliary pump oil inlet reaches the rod cavity of the pressurizing oil cylinder from the second working oil port of the auxiliary valve pressurizing linkage, and the normal idle stroke of the pressurizing oil cylinder is slowly lifted or the drill rod is assisted to be lifted.

Further, when the left handle is lifted upwards and the auxiliary winding button is pressed simultaneously, the pilot pressure oil inlet handle reaches a control oil port of a second pressurizing handle, enters the main valve auxiliary winding pilot control through a second shuttle valve, enables a valve core of the main valve auxiliary winding to move and reverse, the main oil pump oil inlet passes through the main valve auxiliary winding and a pressure compensator and then reaches a first oil inlet of a two-position six-way hydraulic control reversing valve, and finally reaches a second oil port of an auxiliary winding motor through a first working oil port of the two-position six-way hydraulic control reversing valve, and the auxiliary winding motor rotates to drive a speed reducer to rotate so that the auxiliary winding realizes lifting; when the left handle is pressed down and the auxiliary winding button is pressed simultaneously, the pilot pressure oil inlet handle reaches the fourth pressurizing handle control oil port, then enters the main valve auxiliary winding connection pilot control through the first shuttle valve to enable the main valve auxiliary winding connection valve core to move and reverse, the main oil pump oil inlet reaches the second oil inlet of the two-position six-way hydraulic control reversing valve after passing through the main valve auxiliary winding connection and the pressure compensator, and finally reaches the first oil port of the auxiliary winding motor through the second working oil port of the two-position six-way hydraulic control reversing valve, and the auxiliary winding motor rotates to drive the speed reducer to rotate to enable the auxiliary winding to realize downward movement.

Compared with the prior art, the invention has the following beneficial effects:

(1) the rotary drilling rig secondary pressurizing electro-hydraulic control system can well solve the problems that the power head and pressurizing composite action is fast drilled under the condition that the torque of the power head is small, intermittent pressurizing drilling is needed under the condition that the torque is large such as rock strata, the pressurizing oil cylinder can be instantly retracted to reduce the torque to avoid the power head from being locked when the torque is greatly increased due to a hard layer, and the oil cylinder can be rapidly extended or retracted at full speed at the idle long stroke stage, so that the working efficiency is improved; other actions are coordinated and reliable, the problem that the pressurizing oil cylinder, the main hoisting power head, the boarding rotation and the like move simultaneously to perform composite actions is solved, and the actual requirements are met.

(2) The two-stage pressurization electro-hydraulic control method for the rotary drilling rig can flexibly utilize hydraulic oil sources with different flow rates as power sources to drive the actuating mechanism so as to obtain working conditions with different movement speeds to improve the operation efficiency, is suitable for most rotary drilling rigs, and has the same reference significance for equipment with a multi-pump hydraulic system needing different power sources to drive the actuating mechanism.

(3) According to the two-stage pressurization electrohydraulic control method of the rotary drilling rig, working oil ports are not communicated with each other when the auxiliary valve is in a pressurization linkage middle position, so that interference is avoided; the original right handle is used for rapid pressurization, so that the use of the left hand is not influenced during rapid pressurization, the simultaneous operation with the left handle can be realized, the composite action can be realized during rapid pressurization, and the original composite action is not influenced.

In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a hydraulic schematic diagram of a two-stage pressurization electro-hydraulic control system of a rotary drilling rig according to the invention;

the system comprises a first pilot control valve, a first electromagnetic reversing valve, a first shuttle valve, a second pilot control valve, a second electromagnetic reversing valve, a second shuttle valve, a 3-selector valve, a 3.1-two-position six-way pilot control reversing valve, a third electromagnetic reversing valve, a main valve auxiliary winding, a 5-auxiliary valve pressurization winding, a 6-auxiliary winding motor, a 7-pressurization oil cylinder, an 8-oil tank, a 9-pilot pump, a 10-pressure compensator, an 11-balance valve and a 12-filter, wherein the 1-first pilot control valve, the 1.1-first shuttle valve, the 2.1-second electromagnetic reversing valve, the 2.2-second shuttle valve, the 3-selector valve, the 3.1-two-position six-way pilot control reversing valve, the 3.2-third electromagnetic reversing valve, the 4-main valve auxiliary winding, the 5-auxiliary valve pressurization winding, the 6-auxiliary winding motor, the 7-pressurization oil cylinder, the 8-oil tank, the 9-pilot pump, the 10-pressure compensator, the 11-balance valve and the 12-filter.

Detailed Description

Embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.

Referring to fig. 1, the two-stage pressurization electro-hydraulic control system of the rotary drilling rig of the embodiment includes a first pilot control valve 1, a second pilot control valve 2, a selection valve 3, a main valve auxiliary winding unit 4, an auxiliary valve pressurization unit 5, an auxiliary winding motor 6, a pressurization cylinder 7, an oil tank 8 and a pilot pump 9. The concrete structure is as follows:

the first oil inlet P1, the second working oil port P2, the first working oil port a1 and the second working oil port B1 of the first pilot control valve 1 are respectively communicated with a first pressurizing handle control oil port a1, a third pressurizing handle control oil port B1, a first control end S3 of the auxiliary valve pressurizing coupling 5 and a first control end S1 of the main valve auxiliary coupling 4. Preferably, the first pilot control valve 1 includes a first electromagnetic directional valve 1.1 and a first shuttle valve 1.2, an oil inlet P of the first electromagnetic directional valve 1.1 is a first oil inlet P1 of the first pilot control valve 1, a first working oil port a of the first electromagnetic directional valve 1.1 is a first working oil port a1 of the first pilot control valve 1, a second working oil port B of the first electromagnetic directional valve 1.1 is connected with an oil inlet a of the first shuttle valve 1.2, another oil inlet B of the first shuttle valve 1.2 is a second oil inlet P2 of the first pilot control valve 1, and an oil outlet c of the first shuttle valve 1.2 is a second working oil port B1 of the first pilot control valve 1. The first oil inlet P1, the second working oil port P2, the first working oil port a1 and the second working oil port B1 of the second pilot control valve 2 are respectively communicated with a second pressurization handle control oil port aR2, a fourth pressurization handle control oil port bR2, a second control end S4 of the auxiliary valve pressurization union 5 and a second control end S1 of the main valve auxiliary union 4. The second pilot control valve 2 includes a second electromagnetic directional valve 2.1 and a second shuttle valve 2.2, an oil inlet P of the second electromagnetic directional valve 2.1 is a first oil inlet P1 of the second pilot control valve 2, a working oil port B of the second electromagnetic directional valve 2.1 is a first working oil port a1 of the second pilot control valve 2, a second working oil port B of the second electromagnetic directional valve 2.1 is connected with an oil inlet of the second shuttle valve 2.2, another oil inlet B of the second shuttle valve 2.2 is a second oil inlet P2 of the second pilot control valve 2, and an oil outlet c of the second shuttle valve 2.2 is a second working oil port B1 of the second pilot control valve 2. The first pilot control valve and the second pilot control valve arranged in the structure are used for controlling the reversing of the main valve auxiliary rolling connection 4, so that the lifting and lowering switching of the auxiliary winch is realized, or the quick lifting or the quick lowering of the pressurizing oil cylinder is realized.

The selector valve 3 comprises a two-position six-way hydraulic control reversing valve 3.1 and a third electromagnetic reversing valve 3.2, a first control port K1 and a second control port K2 of the two-position six-way hydraulic control reversing valve 3.1 are respectively communicated with a first working oil port A and a second working oil port B of the third electromagnetic reversing valve 3.2, a first working oil port 3 and a second working oil port 4 of the two-position six-way hydraulic control reversing valve 3.1 are respectively communicated with a first oil port A and a second oil port B of the auxiliary hoisting motor 6, and a third working oil port 5 and a fourth working oil port 6 of the two-position six-way hydraulic control reversing valve 3.2 are respectively communicated with a rod cavity and a rodless cavity of the pressurizing oil cylinder 7; an oil inlet P of the third electromagnetic directional valve 3.2 is communicated with an oil outlet of the pilot pump 9. An oil inlet P of the main valve auxiliary coiling block 4 is communicated with an oil inlet of the main oil pump, and a first working oil port A and a second working oil port B of the main valve auxiliary coiling block 4 are respectively communicated with a first oil inlet 1 port and a second oil inlet 2 port of a two-position six-way hydraulic control reversing valve 3.1. An oil inlet P of the auxiliary valve pressurization linkage 5 is communicated with an oil inlet of an auxiliary oil pump, and a first working oil port A and a second working oil port B of the auxiliary valve pressurization linkage 5 are respectively communicated with a rodless cavity and a rod cavity of the pressurization oil cylinder 7.

The two-position six-way hydraulic control reversing valve 3.1 can be selectively switched between the working position of the auxiliary hoisting motor and the working position of the pressurizing cylinder under the action of a pilot control signal of the third electromagnetic reversing valve 3.2. When the auxiliary hoisting motor is located at the working position of the auxiliary hoisting motor, the first oil inlet 1 and the second oil inlet 2 of the two-position six-way hydraulic control reversing valve 3.1 are respectively communicated with the first working oil port 3 and the second working oil port 4 of the two-position six-way hydraulic control reversing valve 3.1, and the hoisting action or the lowering action of the auxiliary hoisting motor 6 is realized. When the hydraulic cylinder is located at the working position of the pressurizing cylinder, the first oil inlet 1 and the second oil inlet 2 of the two-position six-way hydraulic control reversing valve 3.1 are respectively communicated with the third working oil port 5 and the fourth working oil port 6 of the two-position six-way hydraulic control reversing valve 3.1, so that the pressurizing cylinder 7 is quickly lifted or quickly lowered.

In a preferred embodiment of the present invention, the main valve secondary coupling 4 is further connected to a pressure compensator 10, and the oil fed from the main oil pump enters the main valve secondary coupling 4 and is regulated by the pressure compensator 10 to reach the first working oil port 3 or the second working oil port 4 of the two-position six-way hydraulic control directional control valve 3.1, so as to supply oil to the secondary winding motor. Of course, the same applies to the main oil pump supplying oil to the pressurizing cylinder.

In the preferred embodiment of the present invention, the control system further comprises a balance valve 11, and the balance valve is respectively connected with the third working oil port 5 of the two-position six-way hydraulic control directional control valve 3.1 and the rod cavity of the pressurizing oil cylinder 7.

In a preferred embodiment of the invention, the first pilot control valve 1, the second pilot control valve 2, the third electromagnetic directional valve 3.2, the main valve auxiliary winding 4, the auxiliary valve pressurization coupling 5, the auxiliary winding motor 6 and the oil return port of the pressurization oil cylinder 7 are all connected with the oil tank 8.

In the preferred embodiment of the invention, a filter 12 is arranged on a pipeline connecting an oil inlet of the pilot pump 9 and the oil tank 8; and a filter 12 is also arranged on a pipeline connecting an oil return port of the main valve auxiliary winding joint 4, an oil return port of the auxiliary valve pressurizing joint 5, an oil return port of the auxiliary winding motor 6 and an oil return port of the pressurizing oil cylinder 7 with the oil tank 8.

According to the two-stage pressurization electro-hydraulic control method for the rotary drilling rig, the two-stage pressurization electro-hydraulic control system is used for controlling the rotary drilling rig, and in the idle stroke of the pressurization oil cylinder 7, the working oil way of the auxiliary hoisting motor 6 is switched to the pressurization oil cylinder 7 to carry out rapid pressurization work. The method specifically comprises the following steps: in order to realize quick action of switching the auxiliary winding into pressurization, a two-position six-way electro-hydraulic selector valve 3 for realizing main oil circuit switching, a first electromagnetic valve 1.1 and a second electromagnetic valve 2.1 for realizing pressurization and auxiliary winding pilot switching are introduced. When the electromagnetic reversing valve works normally, the first electromagnetic reversing valve 1.1, the second electromagnetic reversing valve 2.1 and the third electromagnetic reversing valve 3.2 lose power; when the right handle is normally pressurized downwards on time, the pilot oil inlet is communicated with the first pressurizing handle control oil port a1, the auxiliary valve pressurizing connection 5 acts to realize reversing, the oil inlet of the auxiliary pump reaches the rodless cavity of the pressurizing oil cylinder 7 through the first working oil port A of the auxiliary valve pressurizing connection, and the normal idle stroke slow-speed lowering or pressurizing action of the pressurizing oil cylinder is realized. When the right handle is lifted upwards, the pilot oil inlet is communicated with a second pressurizing handle control oil port B1, the auxiliary valve pressurizing linkage 5 is enabled to act to realize reversing, the auxiliary pump oil inlet reaches a rod cavity of the pressurizing oil cylinder 7 from a second working oil port B of the auxiliary valve pressurizing linkage 5, and the normal idle stroke of the pressurizing oil cylinder is lifted at a low speed or the drill rod is lifted in an auxiliary mode.

When rapid pressurization is to be realized, the right handle and the right handle compound button are pressed simultaneously, so that the first electromagnetic directional valve 1.1, the second electromagnetic directional valve 2.1 and the third electromagnetic directional valve 3.2 are simultaneously electrified; the first electromagnetic directional valve 1.1 and the third electromagnetic directional valve 3.2 are electrified to realize the switching of pressurization and auxiliary winding pilot lifting and lowering, namely the lifting and lowering pilot oil of the auxiliary valve pressurization linkage 5 return to the oil tank 8 at the same time, the auxiliary valve pressurization linkage 5 does not work, the auxiliary oil pump is in a standby state of not working, and the pressurization pilot oil inlet or return oil of the right handle is communicated with the pilot control of the main valve auxiliary winding linkage 4 through the first electromagnetic directional valve 1.1 and the third electromagnetic directional valve 3.2; the second electromagnetic directional valve 2.1 is electrified, so that the two-position six-way electro-hydraulic directional valve 3.1 is reversed, and the switching of the working oil way in the main oil way is realized. When the first oil inlet 1 of the two-position six-way electro-hydraulic reversing valve 3.1 is communicated with the third working oil port 5, the oil inlet of the main oil pump reaches the rod cavity of the pressurizing oil cylinder 7, and the pressurizing oil cylinder is quickly lifted. When the second oil inlet 2 of the two-position six-way electro-hydraulic reversing valve 3.1 is communicated with the fourth working oil port 6, the oil inlet of the main oil pump reaches the rodless cavity of the pressurizing oil cylinder, and the pressurizing oil cylinder is quickly lowered.

When the left handle is lifted upwards and the auxiliary winding button is pressed simultaneously, the pilot pressure oil inlet handle reaches a second pressurization handle control oil port aR2, then enters the main valve auxiliary winding 4 through a second shuttle valve 2.2 to be subjected to pilot control, so that the valve core of the main valve auxiliary winding 4 moves and reverses, the main oil pump oil inlet passes through the main valve auxiliary winding 4 and the pressure compensator 10 and then reaches a first oil inlet 1 port of a two-position six-way hydraulic control reversing valve 3.1, and finally reaches a second oil port B of an auxiliary winding motor 6 through a first working oil port 3 port of the two-position six-way hydraulic control reversing valve 3.1, and the auxiliary winding motor rotates to drive a speed reducer to rotate so that the auxiliary winding realizes lifting action; when the left handle is pressed down and the auxiliary winding button is pressed simultaneously, the pilot pressure oil inlet handle reaches a fourth pressurizing handle control oil port bR2, then enters the main valve auxiliary winding 4 through the first shuttle valve 1.2 to be subjected to pilot control, so that the valve core of the main valve auxiliary winding 4 moves and reverses, the main oil pump oil inlet passes through the main valve auxiliary winding 4 and the pressure compensator 10 and then reaches a second oil inlet 2 port of the two-position six-way hydraulic control reversing valve 3.1, and finally reaches a first oil port A of the auxiliary winding motor 6 through a second working oil port 4 port of the two-position six-way hydraulic control reversing valve 3.1, and the auxiliary winding motor rotates to drive the speed reducer to rotate so that the auxiliary winding realizes the downward movement.

According to the two-stage pressurizing electro-hydraulic control method for the rotary drilling rig, the oil inlet of the main oil pump is used as a power source when the pressurizing oil cylinder runs in a long idle state through switching operation of the handle electric button, and the speed of extending or retracting of the pressurizing oil cylinder can be doubled. When the idle stroke is finished and the working state is not in a quick working state, the handle button is reset to switch the oil inlet of the auxiliary oil pump to be used as a power source of the pressurizing oil cylinder, the normal state of the normal slow working state is achieved, and construction requirements of drilling and the like of the power head are met.

According to the two-stage pressurizing electro-hydraulic control system of the rotary drilling rig, the actual construction process of ending the idle stroke of the pressurizing oil cylinder needs to be slow, and the small-flow auxiliary oil pump is adopted to provide power at the moment. When the quick action is switched to the work of the large-flow main oil pump, the small-flow auxiliary oil pump is in a standby state without working, and at the moment, the pilot oil source of the action of the pressurizing oil cylinder is cut off from the oil return tank. In actual construction, the auxiliary hoist is not used frequently and there is no composite motion with other motions, so the auxiliary hoist working oil line is switched to the pressurizing cylinder for operation. Meanwhile, in consideration of practical situations such as use and operation convenience, a manipulator operation habit and the like, the switching action can only be operated by an original handle, and the invention effectively solves the problem of interference, namely when the pressurizing oil cylinder works fast, the auxiliary pump, the auxiliary multi-way reversing valve and the auxiliary winch do not work, and when the pressurizing oil cylinder pressurizes normally and slowly, all actions return to the normal state, so that the interference caused by introducing fast pressurization is avoided.

In the two-stage pressurizing electro-hydraulic control system of the rotary drilling rig, the connections between the main pump Ls and the main oil pump, between the auxiliary pump Ls and other action feedback oil and the auxiliary oil pump, between the speed reducer and the auxiliary hoisting motor and the like are all the existing designs, and are not described again.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.