Light clamp control valve group, hydraulic control system comprising light clamp control valve group and hydraulic control method

Abstract

The invention discloses a light clamp control valve group, which is used for light clamp control of a holding-up hammer type drilling machine drill pipe warehouse clamping jaw, and comprises a first hydraulic control one-way valve, an overflow valve, a throttle valve and an electromagnetic directional valve, the overflow valve is used for setting light clamping pressure; the throttle valve is used for limiting the flow of the overflow valve; the electromagnetic directional valve is used for triggering light clamp control; when the electromagnetic reversing valve receives a light clamp control signal, a valve element of the electromagnetic reversing valve is reversed, high-pressure oil of a P port of a hydraulic system opens the first hydraulic control one-way valve through a control oil way, and therefore the high-pressure oil of a large cavity of a clamping jaw oil cylinder is decompressed to the light clamp set pressure through the overflow valve; and then high oil pressure of the P port of the hydraulic system continuously supplies oil to the large cavity of the oil cylinder through the throttle valve, so that the large cavity of the oil cylinder continuously keeps light clamping set pressure. The invention further discloses a hydraulic control system and a hydraulic control method.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of top hammer drill rig drill rod disconnection control, and particularly relates to a light clamp control valve group, a hydraulic control system comprising the same and a hydraulic control method. BACKGROUND

[0002] The top hammer drill rig is not only fast in drilling speed, but also low in efficiency loss. With the increasing requirements for drilling efficiency, drill rig automation, environmental protection and energy saving, the top hammer drill rig with advanced technology, excellent performance and environmental protection and low carbon is increasingly in demand at home and abroad, and occupies an important position in the rock drilling equipment market. At present, the top hammer drill rig is widely used in open-pit mines, construction sites, power stations, highways, ports and other infrastructure sites.

[0003] The top hammer drill rig is generally equipped with a drill rod magazine, and the drill rod is discharged and stored by the combined action of the clamp jaw oil cylinder, the swing arm oil cylinder and the drill rod magazine rotating motor. The drill rig needs to clamp the drill rod with the clamp jaw, and then cooperate with the action of the rock drill to complete the disconnection and connection of the drill rod. The clamping force of the clamp jaw is divided into two types, one is heavy clamping, and the other is light clamping. The light clamping control valve used by the current drill rig is a combination of a pressure reducing valve and a solenoid directional valve. When the pressure in the large cavity of the clamp jaw oil cylinder is released from the heavy clamping pressure to the light clamping pressure, the pressure needs to be released through the solenoid directional valve and the pressure reducing valve. The inventor finds that the instantaneous flow is very large at this time, which easily causes damage to the solenoid directional valve. After the solenoid directional valve is damaged, the heavy clamping pressure cannot be established, which affects the subsequent rod disconnection process, and the drill rig cannot work normally, which seriously reduces the drilling efficiency.

[0004] There is an urgent need to solve the problem that the solenoid directional valve is easily damaged due to the excessive instantaneous flow. SUMMARY

[0005] 1. Technical problem to be solved by the application

[0006] Therefore, the purpose of the present application is to provide a light clamping control valve group, a hydraulic control system comprising the same and a hydraulic control method. Through the organic cooperation of the overflow valve, the throttle valve, the hydraulic control check valve and the solenoid directional valve, the problem of excessive instantaneous flow when the large cavity of the clamp jaw oil cylinder is released from the heavy clamping pressure to the light clamping pressure is solved, and the solenoid directional valve failure is avoided.

[0007] 2. Technical scheme

[0008] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0009] The first aspect of the present application provides a light clamping control valve group for light clamping control of the clamp jaw of the drill rod magazine of the top hammer drill rig, which comprises a first hydraulic control check valve, an overflow valve, a throttle valve and a solenoid directional valve.

[0010] One end of the first hydraulic control check valve is connected with the large cavity of the clamp jaw oil cylinder, and the other end is connected with the oil inlet of the overflow valve, and the control oil port of the first hydraulic control check valve is connected with the A port of the electromagnetic reversing valve through a pipeline;

[0011] The oil outlet of the overflow valve is connected with an oil tank for setting the light clamp pressure.

[0012] One end of the throttle valve is connected with the A port of the electromagnetic reversing valve, and the other end is connected with the oil inlet of the overflow valve and the first hydraulic control check valve respectively, for limiting the flow of the overflow valve.

[0013] The electromagnetic reversing valve controls the flow direction of the oil by switching the fluid channel, when the electromagnetic reversing valve is in the normal position, the T port of the electromagnetic reversing valve is connected with the A port, when the electromagnetic reversing valve receives the light clamp control signal, the electromagnetic reversing valve core is reversed, and the P port of the electromagnetic reversing valve is connected with the A port.

[0014] Further, the nominal diameter of the throttle valve is between 0.4cm and 0.8cm.

[0015] Further, the pressure of the overflow valve can be adjusted, and the pressure is set between 6-10bar.

[0016] Further, the electromagnetic reversing valve adopts a two-position three-way reversing valve.

[0017] Further, the light clamp control valve group is further provided with a pressure measuring valve for measuring the pressure of the light clamp control oil way.

[0018] Further, the first hydraulic control check valve, the overflow valve, the throttle valve and the electromagnetic reversing valve are inserted into the same valve block.

[0019] The second aspect of the present application provides a hydraulic control system comprising the light clamp control valve group, and the hydraulic control system further comprises a heavy clamp control valve for maintaining the pressure of the large cavity of the oil cylinder, so that the clamp jaw is in the heavy clamp state.

[0020] Further, one end of the heavy clamp control valve is connected with a second hydraulic control check valve, the other end of the second hydraulic control check valve is connected with the large cavity of the clamp jaw oil cylinder, and the control oil port of the second hydraulic control check valve is connected with the small cavity of the clamp jaw oil cylinder.

[0021] The third aspect of the present application provides a hydraulic control method for light clamp control of the clamp jaw of the top hammer type drill rod magazine, which adopts the light clamp control valve group or the hydraulic control system, and the hydraulic control method comprises:

[0022] After the drill control system sends the light clamp signal, the electromagnetic reversing valve receives the light clamp signal, the valve core is reversed, and the light clamp control function is activated.

[0023] The high pressure oil of the hydraulic system P port reaches the control oil port of the first hydraulic control check valve through the electromagnetic reversing valve, so that the first hydraulic control check valve opens;

[0024] The high pressure oil of the large cavity of the clamp jaw oil cylinder reaches the inlet of the overflow valve through the first hydraulic control check valve, and the pressure at this time is much higher than the set value of the overflow valve. The oil reaches the T port through the overflow valve, and flows back to the hydraulic oil tank from the T port.

[0025] Then, the high pressure oil of the hydraulic system P port reaches the large cavity of the oil cylinder through the throttle valve and the first hydraulic control check valve, continuously supplies oil to the large cavity of the oil cylinder, and keeps the large cavity of the oil cylinder at a light clamp pressure at all times.

[0026] Further, when the electromagnetic reversing valve does not receive a light clamp control signal, the spool of the electromagnetic reversing valve is in a normal position, no oil passes through the electromagnetic reversing valve, the first hydraulic control check valve is in a closed state, and the large cavity of the oil cylinder is pressure-kept, and the clamp jaw is in a heavy pressure state.

[0027] 3. Beneficial effects

[0028] The light clamp control valve group of the present application is used for light clamp control of the top hammer type drill rod clamp jaw, comprising a first hydraulic control check valve, an overflow valve, a throttle valve and an electromagnetic reversing valve; the overflow valve is used for setting a light clamp pressure; the throttle valve is used for limiting the flow of the overflow valve; the electromagnetic reversing valve is used for triggering light clamp control; when the electromagnetic reversing valve receives a light clamp control signal, the spool of the electromagnetic reversing valve reverses, the high pressure oil of the hydraulic system P port opens the first hydraulic control check valve through the control oil way, so that the high pressure oil of the large cavity of the clamp jaw oil cylinder is discharged to the light clamp set pressure through the overflow valve, and then the high pressure oil of the hydraulic system P port supplies oil to the large cavity of the oil cylinder through the throttle valve, so that the large cavity of the oil cylinder continuously keeps the light clamp set pressure.

[0029] In addition to the purposes, features and effects described above, the present application has other purposes, features and effects. The present application will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a hydraulic control system schematic diagram comprising a light clamp control valve group according to an embodiment of the present application;

[0031] Explanation of reference numerals in the schematic diagram: 1, first hydraulic control check valve, 2, overflow valve, 3, throttle valve, 4, electromagnetic reversing valve, 5, heavy clamp control valve, 6, second hydraulic control check valve. DETAILED DESCRIPTION

[0032] To enable those skilled in the art to better understand this technical solution, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and embodiments.

[0033] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and are not intended to limit the scope of the invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of the invention, should still fall within the scope of the disclosed technical content. Furthermore, terms such as "connected," "connected," "first," "second," and "one end," "the other end," used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0034] Currently, the light clamp control valve group used in open-pit top hammer drills is a combination of a pressure reducing valve and a solenoid directional valve. The pressure in the large chamber of the clamp cylinder is released from the heavy clamp pressure to the light clamp pressure, which requires pressure relief through the solenoid directional valve and the pressure reducing valve. At this time, the instantaneous flow rate is very large, which can easily cause damage to the solenoid directional valve. After the solenoid directional valve is damaged, the heavy clamp pressure cannot be established, which affects the subsequent rod removal process, and the drill cannot work normally, which seriously reduces the drilling efficiency.

[0035] The basic idea of ​​this invention is to solve the problem of excessive instantaneous flow when the large chamber of the gripper cylinder is released from heavy clamping pressure to light clamping pressure by organically cooperating with the overflow valve, throttle valve, first hydraulic control check valve and electromagnetic reversing valve, thereby avoiding electromagnetic reversing valve failure and improving the working efficiency of the drilling rig.

[0036] refer to Figure 1 As shown, a light clamp control valve group of the present invention is used for light clamp control of the drill rod magazine jaws of a top hammer drilling rig. The light clamp control valve group includes a first hydraulic check valve 1, an overflow valve 2, a throttle valve 3, and a solenoid directional valve 4.

[0037] One end of the first hydraulic control check valve 1 is connected to the large chamber of the gripper cylinder, i.e., the rodless chamber (not shown in the figure), and the other end is connected to the oil inlet of the overflow valve 2. The control oil port of the first hydraulic control check valve 1 is connected to the A port of the electromagnetic reversing valve 4 through a pipeline.

[0038] As is known, the solenoid directional valve is generally equipped with a T port, a P port and an A port. The T port is connected to the oil tank, the P port is connected to the pump output port, and the A port represents the working oil port, which is usually connected to the actuator.

[0039] The outlet of the overflow valve 2 is connected to the oil tank and is used to set the light clamp pressure. When the pressure exceeds the set value, the overflow valve opens to guide the excess flow back to the oil tank to ensure pressure stability.

[0040] One end of the throttle valve 3 is connected with the A port of the electromagnetic reversing valve 4, and the other end is connected with the first hydraulic control check valve 1 and the oil inlet of the overflow valve 2 respectively, for limiting the flow of the overflow valve 3, and due to the control of the throttle valve, the overflow flow of the overflow valve is reduced to be very low, and the power loss is small.

[0041] The electromagnetic reversing valve 4 controls the flow direction of oil by switching the fluid channel: when the electromagnetic reversing valve 4 is in the normal position, the T port of the electromagnetic reversing valve 4 is in communication with the A port, and when the electromagnetic reversing valve 4 is connected to the light clamp control signal, the electromagnetic reversing valve 4 core is reversed, and the P port of the electromagnetic reversing valve 4 is in communication with the A port. Preferably, the electromagnetic reversing valve 4 can adopt a two-position three-way reversing valve.

[0042] When selecting the flow diameter of the throttle valve, factors such as flow, pressure, medium type and control accuracy need to be considered comprehensively, and a larger flow diameter is usually required for large flow demand, and a smaller diameter may cause a larger pressure drop, and a smaller flow diameter of the throttle valve can achieve more fine adjustment. Specifically, the nominal diameter of the throttle valve 3 is between 0.4cm and 0.8cm, which can meet the needs, and the nominal diameter is preferably 0.6cm.

[0043] The pressure of the overflow valve 2 can be adjusted, and the pressure is set between 6-10bar, and the pressure is preferably set at 8bar. The pressure of the overflow valve can be adjusted, and different pressure values are set according to different application conditions, which is simple and convenient.

[0044] In some embodiments, the light clamp control valve group is also provided with a pressure measuring valve, Figure 1 The M / M1 port in the pressure measuring valve is a pressure measuring port, which is used for measuring the pressure of the light clamp control oil way. According to the measured pressure, the corresponding valve is adjusted to achieve the optimal implementation effect.

[0045] In addition, the first hydraulic control check valve 1, the overflow valve 2, the throttle valve 3 and the electromagnetic reversing valve 4 can be inserted into the same valve block. In this way, the structure is compact, the pressure loss is small, and the efficiency is high.

[0046] The light clamp control valve group can also be directly superimposed under the heavy clamp control valve, that is, the space is saved, and no additional support is needed.

[0047] The second aspect of the present application also relates to a hydraulic control system, which comprises the light clamp control valve group and a heavy clamp control valve 5, wherein the heavy clamp control valve 5 is used for pressurizing the large cavity of the oil cylinder to make the clamp jaw in the heavy clamp state.

[0048] Specifically, one end of the heavy clamp control valve 5 is connected with a second hydraulic control check valve 6, the other end of the second hydraulic control check valve 6 is connected with a clamp cylinder large cavity, and the control oil port of the second hydraulic control check valve 6 is connected with a clamp cylinder small cavity.

[0049] The third aspect of the present application also relates to a hydraulic control method for light clamp control of a top hammer drill rig pipe clamp, which adopts the light clamp control valve group, and the hydraulic control method comprises the following steps:

[0050] After the drill rig control system sends a light clamp signal, the electromagnetic reversing valve 4 receives the light clamp signal, the valve core is reversed, and the light clamp control function is activated.

[0051] High-pressure oil of the hydraulic system P port reaches the control oil port of the first hydraulic control check valve 1 through the A port of the electromagnetic reversing valve 4, so that the first hydraulic control check valve 1 is opened.

[0052] High-pressure oil of the clamp cylinder large cavity reaches the inlet of the overflow valve 2 through the first hydraulic control check valve 1, at this time, the pressure is much higher than the set value of the overflow valve 2, the oil reaches the T port through the overflow valve 2, flows back to the hydraulic oil tank from the T port, and is depressurized, so that the pressure of the clamp cylinder large cavity is reduced to the pressure set value of the overflow valve 2.

[0053] Then, high-pressure oil of the hydraulic system P port reaches the cylinder large cavity through the throttle valve 3 and the first hydraulic control check valve 1, continuously supplies oil to the cylinder large cavity, and makes the cylinder large cavity always maintain the light clamp pressure.

[0054] When the electromagnetic reversing valve 4 does not receive the light clamp control signal, the valve core of the electromagnetic reversing valve 4 is in a normal position, no oil passes through the electromagnetic reversing valve 4, the first hydraulic control check valve 4 is in a closed state, and the pressure of the cylinder large cavity is maintained, so that the clamp is in a heavy pressure state.

[0055] The design of the hydraulic control check valve improves the pressure maintaining effect of the cylinder large cavity, and the quick response of the overflow valve makes the clamping of the drill rig clamp switch from heavy clamp to light clamp very quickly, greatly improving the efficiency of the automatic pipe disconnection of the drill rig.

[0056] The above describes the present application and its embodiments in a schematic manner, which is not limited, and the embodiments shown in the drawings are only one of the embodiments of the present application, and the actual structure is not limited thereto. If a person skilled in the art is inspired thereby, without departing from the purpose of the present application, similar structural modes to the present technical solution can be designed without creativity, which all belong to the protection scope of the present application.

Claims

1. A light-clamp control valve assembly for light-clamp control of the drill rod magazine jaws of a top hammer drilling rig, characterized in that, The light clamp control valve assembly includes a first hydraulic check valve (1), an overflow valve (2), a throttle valve (3), and a solenoid directional valve (4); One end of the first hydraulic control check valve (1) is connected to the large cavity of the gripper cylinder, and the other end is connected to the oil inlet of the overflow valve (2). The control oil port of the first hydraulic control check valve (1) is connected to the A port of the electromagnetic reversing valve (4) through a pipeline. The outlet of the overflow valve (2) is connected to the oil tank and is used to set the light clamp pressure; One end of the throttle valve (3) is connected to port A of the electromagnetic reversing valve (4), and the other end is connected to the oil inlet of the first hydraulic check valve (1) and the overflow valve (2) respectively, in order to limit the flow rate of the overflow valve (3); The electromagnetic reversing valve (4) controls the flow direction of oil by switching the fluid channel. When the electromagnetic reversing valve (4) is in the normal position, the T port of the electromagnetic reversing valve (4) is connected to the A port. When the electromagnetic reversing valve (4) receives a light clamp control signal, the valve core of the electromagnetic reversing valve (4) is reversed, and the P port of the electromagnetic reversing valve (4) is connected to the A port.

2. The light clamp control valve assembly according to claim 1, characterized in that, The nominal diameter of the throttle valve (3) is between 0.4 cm and 0.8 cm.

3. The light clamp control valve assembly according to claim 2, characterized in that, The pressure of the overflow valve (2) is adjustable, and the pressure is set between 6 and 10 bar.

4. The light clamp control valve assembly according to claim 3, characterized in that, The electromagnetic reversing valve (4) is a two-position three-way reversing valve.

5. The light clamp control valve assembly according to any one of claims 1 to 4, characterized in that, The light clamp control valve assembly is also equipped with a pressure testing valve to measure the pressure of the light clamp control oil circuit.

6. The light clamp control valve assembly according to any one of claims 1 to 4, characterized in that, The first hydraulic control check valve (1), overflow valve (2), throttle valve (3) and solenoid directional valve (4) are all inserted into the same valve block.

7. A hydraulic control system comprising the light clamp control valve assembly according to any one of claims 1 to 6, characterized in that, It also includes a heavy clamping control valve (5), which is used to maintain pressure in the large chamber of the cylinder so that the gripper is in a heavy clamping state.

8. The hydraulic control system according to claim 7, characterized in that, One end of the clamping control valve (5) is connected to a second hydraulic check valve (6), the other end of the second hydraulic check valve (6) is connected to the large chamber of the clamping cylinder, and the control port of the second hydraulic check valve (6) is connected to the small chamber of the clamping cylinder.

9. A hydraulic control method for light clamping control of the drill rod magazine jaws of a top hammer drilling rig, employing the light clamping control valve assembly as described in any one of claims 1 to 6, characterized in that, The hydraulic control method includes: After the drilling rig control system sends a light clamping signal, the electromagnetic reversing valve (4) receives the light clamping signal, the valve core reverses, and the light clamping control function is activated. The high-pressure oil from port P of the hydraulic system passes through the solenoid directional valve (4) to the control port of the first hydraulic control check valve (1), thereby opening the first hydraulic control check valve (1). The high-pressure oil in the large chamber of the gripper cylinder reaches the oil inlet of the overflow valve (2) through the first hydraulic control check valve (1). At this time, the pressure is much higher than the set value of the overflow valve (2). The oil reaches the T port through the overflow valve (2) and flows back to the hydraulic oil tank from the T port. Then, the high-pressure oil from port P of the hydraulic system reaches the large chamber of the cylinder through the throttle valve (3) and the first hydraulic control check valve (1), continuously supplying oil to the large chamber of the cylinder so that the large chamber of the cylinder always maintains a light clamping pressure.

10. The hydraulic control method according to claim 9, characterized in that, When the solenoid directional valve (4) does not receive a light clamp control signal, the valve core of the solenoid directional valve (4) is in the normal position, no oil flows through the solenoid directional valve (4), the first hydraulic control check valve (4) is in the closed state, and the large chamber of the oil cylinder is pressure maintained, and the clamp is in the heavy pressure state.

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