阅读说明：本技术 一种旋挖钻机卷扬平衡阀先导阻尼结构 (Guide damping structure of winch balance valve of rotary drilling rig ) 是由 王鸿宇 孙坚 景军清 戚振红 张衍鹏 韩子龙 于 2021-08-24 设计创作，主要内容包括：本发明公布一种旋挖钻机卷扬平衡阀先导阻尼结构,属于旋挖钻机卷扬平衡阀技术领域。包括溢流阀Ⅰ；所述溢流阀Ⅰ的控制端分别连接有溢流阀Ⅱ、阻尼孔Ⅱ和阻尼孔Ⅰ；所述阻尼孔Ⅰ串联有单向阀Ⅱ,串联后的阻尼孔Ⅰ和单向阀Ⅱ与阻尼孔Ⅱ并联；所述溢流阀Ⅱ与阻尼孔Ⅱ并联。所述阻尼孔Ⅱ和阻尼孔Ⅰ采用不同的规格。当由于微动操作导致的平衡阀先导控制口压力波动时,通过不同规格的阻尼孔Ⅰ和阻尼孔Ⅱ的流量压力产生波动,当压力过大时,溢流阀Ⅱ开启,实现在频繁的启闭过程中恒定压力波动的功能。本发明在卷扬落时,尤其在小开口工况下,能减少抖动情况,提升旋挖钻机卷扬系统的可靠性,保障施工安全。(The invention discloses a pilot damping structure of a hoisting balance valve of a rotary drilling rig, and belongs to the technical field of hoisting balance valves of rotary drilling rigs. The device comprises an overflow valve I; the control end of the overflow valve I is connected with an overflow valve II, a damping hole II and a damping hole I respectively; the damping hole I is connected with a one-way valve II in series, and the damping hole I and the one-way valve II which are connected in series are connected with the damping hole II in parallel; and the overflow valve II is connected with the damping hole II in parallel. The damping hole II and the damping hole I adopt different specifications. When the pressure of a pilot control port of the balance valve fluctuates due to micro-motion operation, the flow pressure of the damping holes I and II with different specifications fluctuates, and when the pressure is overlarge, the overflow valve II is opened, so that the function of constant pressure fluctuation in the frequent opening and closing process is realized. When the winch falls, particularly under the working condition of a small opening, the invention can reduce the shaking condition, improve the reliability of the winch system of the rotary drilling rig and ensure the construction safety.)

1. The utility model provides a dig rig hoist engine balance valve guide damping structure soon which characterized in that: the device comprises an overflow valve I (5); the control end of the overflow valve I (5) is respectively connected with an overflow valve II (9), a damping hole II (8) and a damping hole I (6); the damping hole I (6) is connected with a one-way valve II (7) in series, and the damping hole I (6) and the one-way valve II (7) which are connected in series are connected with a damping hole II (8) in parallel; and the overflow valve II (9) is connected with the damping hole II (8) in parallel.

2. The pilot damping structure of the hoisting balance valve of the rotary drilling rig according to claim 1, wherein: an oil inlet of the overflow valve I (5) is connected with an oil port A of the main reversing valve (3); one end of the overflow valve II (9) is connected with the control end of the overflow valve I (5), and the other end of the overflow valve II (9) is connected with an oil port B of the main reversing valve (3); one end of the damping hole II (8) is connected with the control end of the overflow valve I (5), and the other end of the damping hole II (8) is connected with an oil port B of the main reversing valve (3); one end of the damping hole I (6) is connected with the control end of the overflow valve I (5), the other end of the damping hole I (6) is connected with the check valve II (7), and the other end of the check valve II (7) is connected with an oil port B of the main reversing valve (3); and the check valve II (7) is in one-way communication with the hydraulic oil flowing to the direction of the oil port B of the main reversing valve (3).

3. The pilot damping structure of the hoisting balance valve of the rotary drilling rig according to claim 2, characterized in that: and a check valve I (4) is connected between the oil inlet and the oil outlet of the overflow valve I (5), and the check valve I (4) conducts hydraulic oil flowing from the oil inlet of the overflow valve I (5) to the oil outlet of the overflow valve I (5) in a one-way mode.

4. The pilot damping structure of the hoisting balance valve of the rotary drilling rig according to claim 2, characterized in that: an oil outlet of the overflow valve I (5) is connected with a hoisting motor (12), the other end of the hoisting motor (12) is connected with a speed regulating valve (11), and the other end of the speed regulating valve (11) is connected with an oil port B of the main reversing valve (3); an oil port B of the main reversing valve (3) is connected with a large cavity of the hoisting brake (13), and a small cavity of the hoisting brake (13) is connected with the oil tank (1).

5. The pilot damping structure of the hoisting balance valve of the rotary drilling rig according to claim 2, characterized in that: the oil port P of the main reversing valve (3) is connected with a hydraulic pump (2), and the hydraulic pump (2) is connected with an oil tank (1); the T oil port of the main reversing valve (3) is connected with the oil tank (1).

6. The pilot damping structure of the hoisting balance valve of the rotary drilling rig according to claim 2, characterized in that: the damping hole II (8) and the damping hole I (6) adopt different specifications.

7. The pilot damping structure of the hoisting balance valve of the rotary drilling rig according to claim 2, characterized in that: and the overflow valve II (9), the damping hole II (8), the damping hole I (6) and the check valve II (7) are integrated on a control end cover (15) of the balance valve body (14).

8. The pilot damping structure of the hoisting balance valve of the rotary drilling rig according to claim 2, characterized in that: and a safety valve (10) is connected between the oil outlet of the overflow valve I (5) and the oil outlet B of the main reversing valve (3).

Technical Field

The invention relates to a hoisting balance valve of a rotary drilling rig, in particular to a pilot damping structure of the hoisting balance valve of the rotary drilling rig.

Background

The multifunctional full-hydraulic rotary drilling rig is mechanical equipment for repeatedly drilling by using rotary buckets, short spiral drills, long spiral drills and other drilling tools. The equipment is high-end hole forming equipment for large-diameter pile foundation engineering, and has the characteristics of high technical content, high concentration of electromechanical liquid, high complete machine power, large output torque, high construction efficiency, good success quality, strong stratum adaptation and the like. The main working devices of the rotary drilling rig are a power head and a main hoisting system, wherein the main hoisting system is used for lifting and releasing a drill rod and a drilling bucket and floating in the drilling process.

The hoisting system is used for realizing the functions of load lifting, load descending and load maintaining. Wherein, the load holding function is realized by a core hydraulic element winding balance valve. When the rotary drilling rig finishes the action of hoisting and dropping, the hoisting and dropping often shakes due to the existence of the overrunning load. The matching of the winch balance valve and other elements is generally realized by optimizing key parameters (pilot ratio, spring stiffness, valve core flow area and the like) of the balance valve, so that the phenomenon of shaking is overcome, and the stable and reliable movement of the winch when the winch falls is ensured.

The winch balance valve is mainly a one-way valve which works when being lifted, and the on-way loss of oil is reduced. When the winch falls, the overflow valve and the damping hole mainly work, which is equivalent to that a load (back pressure) is added at an oil return port of the winch motor, so that the winch falls stably and slowly and has small impact. In the actual engineering condition, the shake of the hoisting mechanism is mainly caused by the fact that the flow size and the inlet-outlet time of the oil inlet and the oil return opening are not matched. However, in some cases, due to the aging of equipment and the pollution of oil, the steady-state hydrodynamic stiffness of the actual winch balance valve cannot meet the design requirement, and the vibration range of the natural frequency of the winch balance valve is reached under the coupling with the stiffness of the valve core spring, so that the valve core of the balance valve vibrates. At this time, the vibration of the balanced valve spool is represented in the same form as the chattering, but the mechanism is formed in a quite different manner.

Chinese patent discloses a hoist balancing valve (CN 212657075U), including: the balance valve is internally provided with a balance valve cavity; the valve core is inserted in the balance valve cavity; the port A is formed in the valve body and communicated with the valve cavity of the balance valve through a first channel, and the port A is connected with the multi-way valve; the port B is formed in the valve body and is communicated with the balance valve cavity through a second passage, and the port B is a load port; the X port is formed in the valve body and communicated with the balance valve cavity through a third channel, the X port is a control port, and damping is installed in the third channel; and the valve body is also provided with a fourth channel communicated with the third channel, and the damping can be replaced through the fourth channel. The damping can be replaced by directly opening the fourth channel without disassembling the hard steel pipe connected with the X port, and the operation is simple.

The above prior art has the following disadvantages:

1. the control port in the prior art is simple in structure, the oil drainage oil way of the control port only consists of a one-way valve, the control port does not have the function of adjusting the dynamic stiffness of the steady-state liquid, and resonance is easily induced when the balance valve works;

2. the balancing valve mentioned in the patent is not compact in structural arrangement and does not dominate installation and space occupation.

3. The fixed damping hole is used for filtering and absorbing vibration in the patent, the replacement is inconvenient, and the adaptability is poor.

Disclosure of Invention

The invention provides a pilot damping structure of a hoisting balance valve of a rotary drilling rig, which is mainly used for solving the problem that resonance is easily induced when the conventional balance valve works.

The invention is realized by the following technical scheme: a pilot damping structure of a hoisting balance valve of a rotary drilling rig comprises an overflow valve I; the control end of the overflow valve I is connected with an overflow valve II, a damping hole II and a damping hole I respectively; the damping hole I is connected with a one-way valve II in series, and the damping hole I and the one-way valve II which are connected in series are connected with the damping hole II in parallel; and the overflow valve II is connected with the damping hole II in parallel.

It further comprises the following steps: an oil inlet of the overflow valve I is connected with an oil port A of the main reversing valve; one end of the overflow valve II is connected with the control end of the overflow valve I, and the other end of the overflow valve II is connected with an oil port B of the main reversing valve; one end of the damping hole II is connected with the control end of the overflow valve I, and the other end of the damping hole II is connected with an oil port B of the main reversing valve; one end of the damping hole I is connected with the control end of the overflow valve I, the other end of the damping hole I is connected with the check valve II, and the other end of the check valve II is connected with the oil port B of the main reversing valve; and the check valve II is in one-way communication with the hydraulic oil flowing to the oil port of the main reversing valve B.

And a check valve I is connected between the oil inlet and the oil outlet of the overflow valve I, and the check valve I is in one-way conduction with hydraulic oil flowing from the oil inlet of the overflow valve I to the oil outlet of the overflow valve I.

An oil outlet of the overflow valve I is connected with a hoisting motor, the other end of the hoisting motor is connected with a speed regulating valve, and the other end of the speed regulating valve is connected with an oil port B of the main reversing valve; the oil port B of the main reversing valve is connected with a large cavity of the hoisting brake, and a small cavity of the hoisting brake is connected with an oil tank.

The oil port P of the main reversing valve is connected with a hydraulic pump, and the hydraulic pump is connected with an oil tank; the T oil port of the main reversing valve is connected with an oil tank.

The damping hole II and the damping hole I adopt different specifications.

And the overflow valve II, the damping hole I and the check valve II are integrated on the control end cover of the balance valve body.

And a safety valve is connected between the oil outlet of the overflow valve I and the oil port of the main reversing valve B.

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

(1) when the pressure of a pilot control port of the balance valve fluctuates due to micro-motion operation, the flow pressure of the damping holes I and II with different specifications fluctuates, and when the pressure is overlarge, the overflow valve II is opened, so that the function of constant pressure fluctuation in the frequent opening and closing process is realized, resonance is avoided, and the interference of a shaking phenomenon on a hoisting system is prevented;

(2) the structure is simple, the damping network and the control end cover are integrated, the number of assembly parts is small, a cartridge valve structure is adopted, the production and the assembly are easy, the pressure setting mode of the overflow valve II is simple, and the adaptability is good;

(3) the method is strong in pertinence, is suitable for the unique working condition of the rotary drilling rig, and is suitable for a hoisting system.

Drawings

FIG. 1 is a hydraulic schematic of the present invention;

FIG. 2 is a balance valve profile;

in the figure: 1. an oil tank; 2. a hydraulic pump; 3. a main directional control valve; 4. a one-way valve I; 5. an overflow valve I; 6. a damping hole I; 7. a one-way valve II; 8. a damping hole II; 9. an overflow valve II; 10. a safety valve; 11. a speed regulating valve; 12. a hoist motor; 13. a hoisting brake; 14. a balance valve body; 15. and controlling the end cover.

Detailed Description

The following is a specific embodiment of the present invention, which will be further described with reference to the accompanying drawings.

As shown in fig. 1 and 2, in the pilot damping structure of the winch balance valve of the rotary drilling rig, an oil suction port of a hydraulic pump 2 is connected with an oil tank 1, an oil outlet of the hydraulic pump 2 is connected with a P oil port of a main reversing valve 3, and a T oil port of the main reversing valve 3 is connected with the oil tank 1. The oil port B of the main reversing valve 3 is connected with a large cavity of a hoisting brake 13, and a small cavity of the hoisting brake 13 is connected with the oil tank 1.

An oil inlet of the overflow valve I5 is connected with an oil port A of the main reversing valve 3, an oil outlet of the overflow valve I5 is connected with a hoisting motor 12, the other end of the hoisting motor 12 is connected with a speed regulating valve 11, and the other end of the speed regulating valve 11 is connected with an oil port B of the main reversing valve 3. Be connected with check valve I4 between the oil inlet of overflow valve I5 and the oil-out, check valve I4 is to the hydraulic oil one-way conduction from overflow valve I5 oil inlet flow to overflow valve I5 oil-out direction. And a safety valve 10 is connected between the oil outlet of the overflow valve I5 and the oil port of the main reversing valve 3B.

The control end of overflow valve I5 is connected with overflow valve II 9, damping hole II 8 and damping hole I6 respectively, and damping hole II 8 and damping hole I6 adopt different specifications. One end of the damping hole II 8 is connected with the control end of the overflow valve I5, and the other end of the damping hole II 8 is connected with the oil port B of the main reversing valve 3. One end of the damping hole I6 is connected with the control end of the overflow valve I5, the other end of the damping hole I6 is connected with the check valve II 7, and the other end of the check valve II 7 is connected with the oil port B of the main reversing valve 3; the check valve II 7 conducts hydraulic oil flowing to the direction of the oil port of the main reversing valve 3B in a one-way mode. The overflow valve II 9, the damping hole II 8, the damping hole I6 and the check valve II 7 which are connected in series are connected in parallel. And the overflow valve II 9, the damping hole II 8, the damping hole I6 and the check valve II 7 are integrated on a control end cover 15 of the balance valve body 14.

The working principle is as follows:

when the main reversing valve 3 works at the left position, the winch begins to descend, and at the moment, the control oil exerts pressure on the valve core of the overflow valve I5 through the damping hole II 8, so that the slow opening function of the overflow valve I5 is realized;

when the main reversing valve 3 is reversed from a left position to a middle position, the oil is quickly unloaded through the damping hole I6 and the check valve II 7, the closing of the overflow valve I5 is completed, and the pressure is locked;

when the pressure of a pilot control port of the overflow valve I5 fluctuates due to micro-motion operation, the flow pressure through the damping hole II 8 and the damping hole I6 fluctuates, and when the pressure is overlarge, the overflow valve II 9 is opened, so that constant pressure is realized, and the interference of a jitter phenomenon on a hoisting system is prevented.

The pilot damping structure of the hoisting balance valve of the rotary drilling rig in the embodiment can adjust and improve the steady-state hydrodynamic stiffness of the valve port of the hoisting balance valve, and prevent the resonance phenomenon caused by the coupling of the steady-state hydrodynamic stiffness and the stiffness of the spring. When the winch falls, the shaking condition is reduced particularly under the working condition of a small opening, the reliability of a winch system of the rotary drilling rig is improved, and the construction safety is guaranteed.