Control valve for rock drilling machine

Abstract

The utility model belongs to the technical field of control valves, and particularly relates to a control valve for a rock drilling machine, which comprises a control valve body, one end of the upper surface of the control valve body is in threaded connection with a propelling adjusting pressure reducing valve, and the top of the propelling adjusting pressure reducing valve exceeds the upper surface of the control valve body. A low-impact overflow valve is arranged on the surface of the end, away from the propelling adjusting pressure reducing valve, of the upper surface of the control valve body, a high-impact overflow valve is arranged on one side of the low-impact overflow valve, a drill rod clamping prevention sequence valve is arranged on the side, away from the high-impact overflow valve, of the low-impact overflow valve, and the bottom of the drill rod clamping prevention sequence valve is in threaded connection with the upper surface of the control valve body. When the drilling machine is used, the labor intensity can be reduced, the hole forming efficiency can be improved, various actions of the drilling machine, including the action of the thrust cylinder and the action of the impactor, can be effectively managed and controlled, and due to the design, the system structure is simplified, the manufacturing cost is reduced, and the reliability and the working efficiency of the system are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of control valves, in particular to a control valve for a rock drilling rig. Background Art

[0002] Rock drilling refers to the process of drilling holes in rock (or ore). This process is typically performed using a rock drill, which primarily consists of a frame, a mechanical arm, a propeller beam, and a rock drilling mechanism. The drill tool mounted on this mechanism consists of a drill bit, a drill rod (also called a drill pipe), and a drill adapter. When drilling shallow holes, the drill adapter is typically integrated with the drill rod, with a movable drill bit mounted on the rod. Drills with an integrated drill bit, drill rod, and drill adapter are rarely used in rock drilling operations. Precise control of the hydraulic system's pressure, flow, and direction is crucial for improving drilling efficiency, ensuring hole quality, and extending the equipment's service life.

[0003] Existing control valves have problems such as low control accuracy, slow response speed, poor stability and easy failure, which cannot meet the efficient operation requirements of rock drilling rigs under complex working conditions. In order to solve the above problems, this application proposes a control valve for rock drilling rigs. Utility Model Content

[0004] (1) Purpose of the utility model

[0005] In order to solve the technical problems existing in the background technology, the utility model proposes a control valve for a rock drilling rig, which adopts a propulsion regulating pressure reducing valve, an anti-jamming drill sequence valve, etc., to solve the problem of drill jamming during the drilling process of the rock drilling rig, and also solves the problem of low high-pressure impact efficiency when the impact hammer encounters soft rock during operation, thereby solving the problems raised in the background technology.

[0006] (2) Technical solution

[0007] In order to solve the above technical problems, the utility model provides a control valve for a rock drilling rig, comprising a control valve body, wherein one end of the upper surface of the control valve body is threadedly connected to a propulsion regulating pressure reducing valve, and the top of the propulsion regulating pressure reducing valve protrudes from the upper surface of the control valve body;

[0008] A low-stroke relief valve is provided on one end of the upper surface of the control valve body away from the propulsion regulating pressure reducing valve, and a high-stroke relief valve is provided on one side of the low-stroke relief valve;

[0009] An anti-sticking sequence valve is provided on the side of the low-stroke relief valve away from the high-stroke relief valve, and the bottom of the anti-sticking sequence valve is threadedly connected to the upper surface of the control valve body;

[0010] An externally controlled pressure reducing valve is provided in the middle of the propulsion regulating pressure reducing valve and the anti-stuck sequence valve, and the end portion of the externally controlled pressure reducing valve is longer than the side wall of the control valve body.

[0011] Preferably, the bottoms of the low-stroke relief valve and the high-stroke relief valve are respectively connected to the upper surface of the control valve body by threads, and the low-stroke relief valve and the high-stroke relief valve are symmetrically distributed.

[0012] Preferably, a two-position four-way reversing valve is provided between the externally controlled pressure reducing valve and the propulsion regulating pressure reducing valve, and the two-position four-way reversing valve is fixedly provided on the upper surface of the control valve body.

[0013] Preferably, a No. 1 one-way valve and a No. 2 one-way valve are threadedly connected to the surface of one end of the control valve body, and the No. 1 one-way valve and the No. 2 one-way valve are symmetrically distributed.

[0014] Preferably, a No. 4 one-way valve is provided on a side surface of the No. 1 one-way valve away from the No. 2 one-way valve.

[0015] Preferably, a two-position three-way hydraulic control valve is provided on one side of the two-position four-way reversing valve, and a No. 3 one-way valve is provided on one side of the two-position three-way hydraulic control valve. The two-position three-way hydraulic control valve and the No. 3 one-way valve are located between the propulsion regulating pressure reducing valve and the two-position four-way reversing valve.

[0016] Preferably, the front surface of the control valve body is threadedly connected to a No. 1 shuttle valve, and the back surface of the control valve body is threadedly connected to a No. 2 shuttle valve.

[0017] The above technical solution of the utility model has the following beneficial technical effects:

[0018] The utility model is composed of a propulsion regulating pressure reducing valve, a low-stroke relief valve, a high-stroke relief valve, an anti-stuck drill sequence valve, an externally controlled pressure reducing valve, a two-position four-way reversing valve, a one-way valve, a shuttle valve, a one-way valve, and a two-position three-way hydraulic control valve; the propulsion regulating pressure reducing valve can adjust different propulsion pressures according to the hardness of the rock formation; the R1 port is connected to the drilling port of the rotary motor, and when the rotary pressure reaches the set value of the anti-stuck drill sequence valve, the propulsion is changed to a lifting action to solve the drill sticking problem; the external control oil of the externally controlled pressure reducing valve is controlled by the propulsion chamber pressure. When the rock formation is soft and the propulsion damping is not large, the externally controlled pressure reducing valve is opened, and the high-stroke relief valve oil is introduced into the low-stroke relief valve circuit to limit the pressure, and the power is adjusted to realize the switching between large and small impacts, thereby reducing labor intensity and improving the hole-making efficiency; it can effectively manage and control various actions of the drilling rig, including the action of the propulsion cylinder and the action of the impactor; this design not only simplifies the system structure and reduces manufacturing costs, but also improves the reliability and working efficiency of the system; BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of a control valve for a rock drilling rig according to the present invention;

[0020] Figure 2 This is a schematic diagram of the top view of a control valve for a rock drilling rig according to the present invention;

[0021] Figure 3 This is a front structural diagram of a control valve for a rock drilling rig according to the present invention;

[0022] Figure 4 This is a left-side structural schematic diagram of a control valve for a rock drilling rig according to the present invention;

[0023] Figure 5 This is a rear structural schematic diagram of a control valve for a rock drilling rig according to the present invention;

[0024] Figure 6 This is a right side structural schematic diagram of a control valve for a rock drilling rig according to the present invention;

[0025] Figure 7 This is a schematic diagram of the flow connection structure of a control valve for a rock drilling rig according to the present invention.

[0026] Reference numerals:

[0027] 1. Thrust regulating pressure reducing valve; 2. Low-stroke relief valve; 3. High-stroke relief valve; 4. Anti-sticking sequence valve; 5. Externally controlled pressure reducing valve; 6. Two-position four-way directional control valve; 7.1. No. 1 check valve; 7.2. No. 2 check valve; 7.3. No. 3 check valve; 8.1. No. 1 shuttle valve; 8.2. No. 2 shuttle valve; 9. No. 4 check valve; 10. Two-position three-way hydraulic control valve. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. Furthermore, descriptions of known structures and technologies are omitted in the following description to avoid unnecessary confusion regarding the concepts of the present invention.

[0029] like Figure 1-7 As shown, the present invention proposes a control valve for a rock drilling rig, comprising a control valve body, one end of the upper surface of the control valve body being threadedly connected to a propulsion regulating pressure reducing valve 1, and the top of the propulsion regulating pressure reducing valve 1 protruding from the upper surface of the control valve body;

[0030] A low-stroke relief valve 2 is provided on one end of the upper surface of the control valve body away from the propulsion regulating pressure reducing valve 1, and a high-stroke relief valve 3 is provided on one side of the low-stroke relief valve 2;

[0031] An anti-sticking sequence valve 4 is provided on the side of the low-stroke relief valve 2 away from the high-stroke relief valve 3, and the bottom of the anti-sticking sequence valve 4 is threadedly connected to the upper surface of the control valve body;

[0032] An externally controlled pressure reducing valve 5 is provided in the middle of the propulsion regulating pressure reducing valve 1 and the anti-sticking sequence valve 4, and the end portion of the externally controlled pressure reducing valve 5 is longer than the side wall of the control valve body.

[0033] In this embodiment, if Figure 1 and Figure 2 As shown, the bottoms of the low-stroke relief valve 2 and the high-stroke relief valve 3 are respectively connected to the upper surface of the control valve body by threads, and the low-stroke relief valve 2 and the high-stroke relief valve 3 are symmetrically distributed.

[0034] In this embodiment, if Figure 1 and Figure 2 As shown, a two-position four-way reversing valve 6 is provided between the externally controlled pressure reducing valve 5 and the propulsion regulating pressure reducing valve 1 , and the two-position four-way reversing valve 6 is fixedly provided on the upper surface of the control valve body.

[0035] In this embodiment, if Figure 3 and Figure 4 As shown, one end surface of the control valve body is threadedly connected to a first check valve 7.1 and a second check valve 7.2, and the first check valve 7.1 and the second check valve 7.2 are symmetrically distributed.

[0036] In this embodiment, if Figure 3 and Figure 4 As shown, a No. 4 one-way valve is provided on a side surface of the No. 1 one-way valve 7.1 away from the No. 2 one-way valve 7.2.

[0037] In this embodiment, if Figure 1 and Figure 2 As shown, a two-position three-way hydraulic control valve 10 is provided on one side of the two-position four-way reversing valve 6, and a No. 3 one-way valve 7.3 is provided on one side of the two-position three-way hydraulic control valve 10. The two-position three-way hydraulic control valve 10 and the No. 3 one-way valve 7.3 are located between the propulsion regulating pressure reducing valve 1 and the two-position four-way reversing valve 6.

[0038] In this embodiment, if Figure 3 and Figure 5 As shown, the front surface of the control valve body is threadedly connected to a No. 1 shuttle valve 8.1, and the back surface of the control valve body is threadedly connected to a No. 2 shuttle valve 8.2.

[0039] The working principle and usage of this utility model are as follows: The thrust regulating pressure reducing valve 1 can adjust thrust pressure according to rock formation hardness. Port R1 is connected to the rotary motor drilling port. When the rotary pressure reaches the set value of the anti-sticking sequence valve 4, the two-position four-way reversing valve 6 switches direction, switching from thrust to lifting, thus resolving drill sticking issues. The externally controlled pressure reducing valve 5 is controlled by the thrust cylinder chamber pressure. When the rock formation is soft and thrust resistance is low, the externally controlled pressure reducing valve 5 opens, directing oil from the high-stroke relief valve 3 to the low-stroke relief valve 2 to limit the low-stroke operating pressure. When the rock formation is hard and thrust resistance is high, the externally controlled pressure reducing valve 5 closes, allowing the high-stroke relief valve 3 to limit the high-stroke operating pressure, thereby adjusting power and switching between high and low-stroke. Shuttle valve 8.1 receives the thrust signal pressure and feeds it to the variable pump control LS. Shuttle valve 8.2 receives the thrust cylinder signal pressure and feeds it to the variable pump control LS. Check valves 7.1, 7.2, 7.3, and 9 all provide one-way flow, with reverse flow blocking forward flow. The two-position three-way hydraulic control valve 10 cuts off the load pressure of the drilling motor when retracting and expanding the hole to avoid malfunction of switching from retracting to advancing.

[0040] It should be understood that the above-described specific embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and do not constitute limitations of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention shall be included within the scope of protection of the present invention. In addition, the appended claims of the present invention are intended to cover all variations and modifications that fall within the scope and metes and bounds of the appended claims or their equivalents.

Claims

1. A control valve for a rock drilling rig, comprising a control valve body, characterized in that: One end of the upper surface of the control valve body is threadedly connected to a propulsion regulating pressure reducing valve (1), and the top of the propulsion regulating pressure reducing valve (1) exceeds the upper surface of the control valve body; A low-stroke relief valve (2) is provided on one end of the upper surface of the control valve body away from the propulsion regulating pressure reducing valve (1), and a high-stroke relief valve (3) is provided on one side of the low-stroke relief valve (2); An anti-stuck sequence valve (4) is provided on a side of the low-stroke relief valve (2) away from the high-stroke relief valve (3), and the bottom of the anti-stuck sequence valve (4) is threadedly connected to the upper surface of the control valve body; An externally controlled pressure reducing valve (5) is provided in the middle of the propulsion regulating pressure reducing valve (1) and the anti-stuck sequence valve (4), and the end length of the externally controlled pressure reducing valve (5) exceeds the side wall of the control valve body.

2. A control valve for a rock drilling rig according to claim 1, characterized in that: The bottoms of the low-stroke relief valve (2) and the high-stroke relief valve (3) are respectively connected to the upper surface of the control valve body by threads, and the low-stroke relief valve (2) and the high-stroke relief valve (3) are symmetrically distributed.

3. A control valve for a rock drilling rig according to claim 2, characterized in that: A two-position four-way reversing valve (6) is provided between the externally controlled pressure reducing valve (5) and the propulsion regulating pressure reducing valve (1), and the two-position four-way reversing valve (6) is fixedly arranged on the upper surface of the control valve body.

4. A control valve for a rock drilling rig according to claim 3, characterized in that: One end surface of the control valve body is threadedly connected to a No. 1 one-way valve (7.1) and a No. 2 one-way valve (7.2), and the No. 1 one-way valve (7.1) and the No. 2 one-way valve (7.2) are symmetrically distributed.

5. A control valve for a rock drilling rig according to claim 4, characterized in that: A No. 4 one-way valve is provided on a side surface of the No. 1 one-way valve (7.1) away from the No. 2 one-way valve (7.2).

6. A control valve for a rock drilling rig according to claim 5, characterized in that: A two-position three-way hydraulic control valve (10) is provided on one side of the two-position four-way reversing valve (6), and a No. 3 check valve (7.3) is provided on one side of the two-position three-way hydraulic control valve (10). The two-position three-way hydraulic control valve (10) and the No. 3 check valve (7.3) are located between the propulsion regulating pressure reducing valve (1) and the two-position four-way reversing valve (6).

7. A control valve for a rock drilling rig according to claim 6, characterized in that: The front surface of the control valve body is threadedly connected to a No. 1 shuttle valve (8.1), and the back surface of the control valve body is threadedly connected to a No. 2 shuttle valve (8.2).

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