A self-adaptive and adjustable hydraulic control system for the winch of a rock drilling rig

Abstract

The present invention discloses a hydraulic control system of a self-adaptive and adjustable winch of a rock drilling rig, which is compared with the prior art and adds a first reversing valve, a second shuttle valve, a throttle valve, a relief valve, a remote pressure regulating relief valve and a second reversing valve. When the first reversing valve and the second reversing valve are opened, the external unlocking oil source enters the unlocking channel through the second shuttle valve to brake and open the reducer. At the same time, the second reversing valve is opened to connect the control port of the relief valve and the oil inlet of the remote pressure regulating relief valve. The tension of the winch can be adjusted by adjusting the pressure of the remote pressure regulating relief valve. When the force of the rock supporting the down-the-hole hammer is less than the difference between the gravity of the down-the-hole hammer working device and the tension of the winch, the winch motor and the remote pressure regulating relief valve will automatically work due to the gravity of the down-the-hole hammer; the down-the-hole hammer will be lowered for a distance accordingly to achieve balance, and as the down-the-hole hammer continues to drill, the winch will automatically follow and be lowered. The present invention can reduce the labor intensity of workers and improve work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic control systems, and in particular to a hydraulic control system of a self-adaptive and adjustable rock drilling rig winch. Background Art

[0002] The rock drilling rig uses a down-the-hole hammer to drill continuously. Every time the down-the-hole hammer drills a certain depth, it needs to operate the winch to lower it a certain distance. During the down-the-hole hammer drilling process, the operator needs to operate the winch to lower it according to the drilling depth. In addition, the working characteristics of the down-the-hole hammer require a suitable force to be applied to the rock, and the size of this force directly affects the construction efficiency. The size of the suitable force applied to the rock varies according to the hardness of the rock. The weight of the down-the-hole hammer working device will also vary according to the increase in the drilling depth. Generally, the weight of the down-the-hole hammer working device will increase with the increase in the hole depth.

[0003] like Figure 1 As shown, the hydraulic system of the winch of the rock drilling rig in the prior art, when the A control oil circuit of the hydraulic motor is filled with oil, the winch is lifted, and when the B control oil circuit of the hydraulic motor is filled with oil, the winch is lowered; when the A control oil circuit or the B control oil circuit is filled with oil, the pressure oil can enter the pressure reducing valve 4 through the oil outlet of the first shuttle valve 6, and then enter the unlocking chamber of the winch motor 1 through the control port of the hydraulic control valve 2. In this way, the winch needs to be operated to lower a certain distance every time the down-the-hole hammer drills a certain distance. Therefore, the manual operation of the winch cannot match the drilling speed, and the force applied to the rock by the down-the-hole hammer working device after each winch is lowered will go through a process from large to small; it has high technical requirements for operators and seriously affects the construction efficiency. Summary of the invention

[0004] The object of the present invention is to provide a self-adaptive and adjustable hydraulic control system for a rock drilling rig winch to solve the problems raised in the background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides a hydraulic control system for an adaptively adjustable rock drilling rig winch, comprising a winch motor, a hydraulic control valve, a pressure reducing valve, a balancing valve, a first shuttle valve, a first reversing valve, a second shuttle valve, a throttle valve, a relief valve, a remote pressure regulating relief valve and a second reversing valve; the two oil inlets of the first shuttle valve are respectively connected to the A and B control oil circuits of the winch motor, the oil outlet of the first shuttle valve is connected to an oil inlet of the second shuttle valve, and the other oil inlet of the second shuttle valve is connected to the oil outlet of the first reversing valve; the oil outlet of the second shuttle valve is connected to the rod chamber of the brake cylinder through the pressure reducing valve and the hydraulic control valve in sequence; the balancing valve and the relief valve are both connected in parallel to the A and B control oil circuits of the winch motor, and the throttle valve is installed between the oil inlet of the relief valve and the A control oil circuit of the winch motor; the control oil port of the relief valve is connected to the oil inlet of the second reversing valve, and the oil outlet of the second reversing valve is connected to the oil inlet of the remote pressure regulating relief valve.

[0006] Furthermore, the two control oil circuits A and B of the hoisting motor are connected to the control oil source, and the oil inlet of the first reversing valve is connected to the external unlocking oil source.

[0007] Furthermore, the first reversing valve is a two-position three-way solenoid valve, and the second reversing valve is a two-position two-way solenoid valve.

[0008] Furthermore, the oil return ports of the hoisting motor, the hydraulic control valve, the pressure reducing valve, the first reversing valve and the remote pressure regulating relief valve are respectively connected to the hydraulic oil tank.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] The hydraulic control system of the self-adaptive adjustable rock drilling rig winch of the present invention comprises a winch motor, a hydraulic control valve, a pressure reducing valve, a balancing valve, a first shuttle valve, a first reversing valve, a second shuttle valve, a throttle valve, a relief valve, a remote pressure regulating relief valve and a second reversing valve. Compared with the prior art, the present invention adds a first reversing valve, a second shuttle valve, a throttle valve, a relief valve, a remote pressure regulating relief valve and a second reversing valve. When the first reversing valve and the second reversing valve are opened, the external unlocking oil source enters the unlocking channel through the second shuttle valve to open the brake cylinder; at the same time, the second reversing valve is opened to connect the control port of the relief valve with the oil inlet of the remote pressure regulating relief valve, and the pulling force of the winch can be adjusted by adjusting the pressure of the remote pressure regulating relief valve. When the force of the rock supporting the down-the-hole hammer is less than the difference between the gravity of the down-the-hole hammer working device and the pulling force of the winch, the winch motor and the remote pressure regulating relief valve will automatically work due to the gravity of the down-the-hole hammer, and the down-the-hole hammer will be lowered for a distance to achieve balance; as the down-the-hole hammer continues to drill, the winch will automatically follow and lower. The present invention can reduce the labor intensity of workers and improve work efficiency.

[0011] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0013] Figure 1 It is a schematic diagram of the hydraulic system of the rock drilling rig winch in the prior art;

[0014] Figure 2 It is a schematic diagram of a hydraulic system of a self-adaptive and adjustable rock drilling rig winch of the present invention;

[0015] Among them, 1. winch motor, 2. hydraulic control valve, 3. hydraulic oil tank, 4. pressure reducing valve, 5. balancing valve, 6. first shuttle valve, 7. first reversing valve, 8. second shuttle valve, 9. throttle valve, 10. overflow valve, 11. remote pressure regulating overflow valve, 12. second reversing valve. DETAILED DESCRIPTION

[0016] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0017] See also Figure 2 A hydraulic control system for an adaptive and adjustable rock drilling rig winch includes a winch motor 1, a hydraulic control valve 2, a pressure reducing valve 4, a balancing valve 5, a first shuttle valve 6, a first reversing valve 7, a second shuttle valve 8, a throttle valve 9, a relief valve 10, a remote pressure regulating relief valve 11 and a second reversing valve 12. Specifically, the two oil inlets of the first shuttle valve are respectively connected to the A and B control oil circuits of the winch motor, the oil outlet of the first shuttle valve is connected to an oil inlet of the second shuttle valve, and the other oil inlet of the second shuttle valve is connected to the oil outlet of the first reversing valve. The oil outlet of the second shuttle valve is connected to the rod chamber of the brake cylinder through the pressure reducing valve and the hydraulic control valve in sequence. The balance valve is arranged between the first shuttle valve and the hoisting motor, the relief valve is arranged between the balance valve and the hoisting motor, the throttle valve is arranged between the oil inlet of the relief valve and the A control oil circuit of the hoisting motor, the control oil port of the relief valve is connected to the oil inlet of the second reversing valve, and the oil outlet of the second reversing valve is connected to the oil inlet of the remote pressure regulating relief valve. When the pressure of the remote pressure regulating relief valve reaches the opening pressure, the hydraulic oil in the A oil circuit will flow to the B oil circuit through the relief valve 10.

[0018] Among them, the A and B control oil circuits of the hoist motor are connected to the motor unlocking through the first shuttle valve 6 and the second shuttle valve 8; the oil inlet of the first reversing valve is connected to the external unlocking oil source, and the oil outlet is connected to the motor unlocking through the second shuttle valve 8; the return oil ports of the hoist motor, the hydraulic control valve, the pressure reducing valve, the first reversing valve and the remote pressure regulating overflow valve are respectively connected to the hydraulic oil tank 3. Specifically, the first reversing valve can adopt a two-position three-way solenoid valve, and the second reversing valve can adopt a two-position two-way solenoid valve.

[0019] The specific working principle of the hydraulic control system of the self-adaptive adjustable rock drilling rig hoist in this embodiment is as follows:

[0020] When the A port of the hoist is supplied with oil, the hoist is lifted, and when the B port is supplied with oil, the hoist is lowered. The oil inlet C of the first solenoid valve is connected to the external unlocking oil source, and the external unlocking oil source needs to always maintain sufficient pressure for the hoist motor 1 to unlock. When the first reversing valve 7 and the second reversing valve 12 are opened, the external unlocking oil source enters the unlocking channel of the hoist motor through the second shuttle valve 8, and the control port of the overflow valve 10 is connected to the oil inlet of the remote pressure regulating overflow valve 11. By adjusting the pressure of the remote pressure regulating overflow valve, when the overflow valve 10 reaches the overflow state, the down-the-hole hammer working device of the rock drilling rig moves downward against gravity and friction. By adjusting the opening size of the throttle valve 9, the lowering speed of the down-the-hole hammer can be adjusted. Let the pulling force of the hoist be T, T = q × p × n × η + f; where q is the theoretical displacement of the hoist motor, p is the pressure value adjusted by the overflow valve, n is the reduction ratio of the hoist reducer, η is the volumetric efficiency of the hoist motor, and f is the system friction. Therefore, the pressure of the overflow valve can be adjusted to adjust the magnitude of the force exerted by the down-the-hole hammer on the rock, and the pressure of the overflow valve can be adjusted by the remote pressure regulating overflow valve. Let the force exerted by the down-the-hole hammer on the rock be F, and the gravity of the down-the-hole hammer working device be G, then F = G - T.

[0021] From the above working principle, it can be concluded that during the working process, as long as the remote pressure regulating overflow valve 21 located in the operation room is adjusted, the force F exerted by the down-the-hole hammer on the rock can be adjusted. Let F be a fixed value, and the basis for the establishment of this principle is G > f + F, that is, only when the gravity of the down-the-hole hammer working device is greater than the system friction and the force exerted by the down-the-hole hammer on the rock, can the force F exerted by the down-the-hole hammer on the rock be adjusted through the overflow valve; this inequality holds under actual construction conditions. The operator only needs to adjust the parameter F, and the down-the-hole hammer can work continuously. During the drilling process of the down-the-hole hammer, after the down-the-hole hammer drills a certain distance; when F < G - T, due to the gravity of the down-the-hole hammer, the overflow valve 10 and the remote pressure regulating overflow valve 11 work, and the down-the-hole hammer will drop a certain distance accordingly to reach the force balance of F = G - T again. Through the above improvements, the labor intensity of workers can be reduced and the work efficiency can be improved in the present invention.

[0022] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An adaptive and adjustable hydraulic control system for a rock drilling rig winch, characterized in that: The invention comprises a hoisting motor (1), a hydraulic control valve (2), a pressure reducing valve (4), a balancing valve (5), a first shuttle valve (6), a first reversing valve (7), a second shuttle valve (8), a throttle valve (9), a relief valve (10), a remote pressure regulating relief valve (11) and a second reversing valve (12); the two oil inlets of the first shuttle valve are respectively connected to the two control oil circuits A and B of the hoisting motor, the oil outlet of the first shuttle valve is connected to an oil inlet of the second shuttle valve, and the other oil inlet of the second shuttle valve is connected to the oil outlet of the first reversing valve; the oil outlet of the second shuttle valve is connected to the oil outlet of the first reversing valve through the pressure reducing valve and the hydraulic control valve in sequence. The rod chamber of the brake cylinder is connected; the balance valve and the overflow valve are connected in parallel to the A and B control oil circuits of the winch motor, and the throttle valve is installed between the oil inlet of the overflow valve and the A control oil circuit of the winch motor; the control oil port of the overflow valve is connected to the oil inlet of the second reversing valve, and the oil outlet of the second reversing valve is connected to the oil inlet of the remote pressure-regulating overflow valve; the A and B control oil circuits of the winch motor are connected to the control oil source, and the oil inlet of the first reversing valve is connected to the external unlocking oil source; the first reversing valve is a two-position three-way solenoid valve, and the second reversing valve is a two-position two-way solenoid valve.

2. The hydraulic control system according to claim 1, characterized in that: The oil return ports of the hoisting motor, the hydraulic control valve, the pressure reducing valve, the first reversing valve and the remote pressure regulating relief valve are respectively connected to the hydraulic oil tank (3).

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