Rock drilling hydraulic control system and method and rock drilling machine

Abstract

The invention discloses a rock drilling hydraulic control system and method and a rock drill, and belongs to the technical field of hydraulic control. According to the system, a damping hole and an adjustable throttling valve are connected with an outlet of a hydraulic pump, an electromagnetic reversing valve and an overflow valve are connected with the damping hole, and a hydraulic control one-way valve is connected with the overflow valve; the low-impact hydraulic control reversing valve is connected with the adjustable throttling valve, and the high-impact hydraulic control reversing valve is connected with an outlet of the hydraulic pump; the high-low impact switching hydraulic control reversing valve is connected with the high-impact hydraulic control reversing valve, and the rotary pressure hydraulic control reversing valve and the propelling pressure hydraulic control reversing valve are both connected with the high-low impact switching hydraulic control reversing valve. According to the invention, one plunger pump can control rock drilling impact and can also control an auxiliary system; the flow of the rock drill is controlled through throttling, so that the rock drill works in a low-impact mode, the most direct parameter requirement of the rock drill in use is met, and the impact mode of the rock drill is accurately controlled.

Description

Technical Field

[0001] This invention relates to the field of hydraulic control technology, and in particular to a rock drilling hydraulic control system, method and rock drill. Background Technology

[0002] A rock drill is a tool used to directly extract stone. It drills holes in rock strata to insert explosives, blasting the rock to complete the extraction of stone or other rock excavation work. In addition, rock drills can also be modified into breakers to crush hard layers such as concrete. They can operate in both high mountains and plains, in extreme temperatures ranging from +40°C to -40°C. Rock drills have various functions including drilling holes in mining, construction, and splitting, crushing, compacting, and chiseling in cement and asphalt road surfaces, and are widely used in mining, construction, and quarrying. Currently, most rock drilling control systems use hydraulic valves. Low feed corresponds to low impact, and high feed corresponds to high impact. High and low impact pressure control, anti-dry drilling, and anti-jamming are controlled by multiple valve groups. Furthermore, impact pressure and auxiliary actions are controlled by two plunger pumps respectively. It is impossible to use only one plunger pump to control both rock drilling impact and auxiliary systems. It is also impossible to ensure that in some working conditions such as when the drill is stuck and needs to be withdrawn, the rock drill still needs to work at high impact pressure even if the feed pressure is low in order to achieve a good drill bit removal effect. Summary of the Invention

[0003] The purpose of this invention is to provide a rock drilling hydraulic control system, method, and rock drill, which can enable a single plunger pump to control both the rock drilling impact and the auxiliary system.

[0004] To achieve the above objectives, the present invention employs the following technical solution: In a first aspect, the present invention provides a rock drilling hydraulic control system, comprising: a damping orifice, an electromagnetic directional valve, a hydraulically controlled check valve, an overflow valve, an adjustable flow valve, a low-impact hydraulically controlled directional valve, a high-impact hydraulically controlled directional valve, a high-low-impact switching hydraulically controlled directional valve, a rotary pressure hydraulically controlled directional valve, and a propulsion pressure hydraulically controlled directional valve. The damping orifice is connected to the hydraulic pump outlet P, and both the electromagnetic directional valve and the relief valve are connected to the damping orifice. The inlet of the hydraulic control check valve is connected to the outlet of the overflow valve, and the control port of the hydraulic control check valve is connected to the impact signal source port XH, which is used to open the hydraulic control check valve when there is an impact signal. The inlets of the adjustable flow valve and the high-impact hydraulic control directional valve are both connected to the outlet of the hydraulic pump. The outlet of the adjustable flow valve is connected to the inlet of the low-impact hydraulic control directional valve. The control port of the low-impact hydraulic control directional valve is connected to the impact signal source port XH, which is used to switch the low-impact hydraulic control directional valve when there is an impact signal. The high-impact hydraulic control directional valve control port is connected to the outlet of the high-low-impact switching hydraulic control directional valve; the high-low-impact switching hydraulic control directional valve control port is connected to the low propulsion pressure signal source port XC, which is used to switch the high-low-impact switching hydraulic control directional valve when there is a low propulsion pressure signal. The inlet of the rotary pressure hydraulic control directional valve is connected to the impact signal source port XH, and the control port is connected to the rotary pressure signal source port XR. The inlet of the propulsion pressure hydraulic control directional valve is connected to the impact signal source port XH, and the control port is connected to the high propulsion pressure signal source port XF. The outlets of both the rotary pressure hydraulic control directional valve and the propulsion pressure hydraulic control directional valve are connected to the inlet of the high-low stroke switching hydraulic control directional valve.

[0005] Preferably, the electromagnetic directional valve is a two-position, two-way electromagnetic directional valve. The P port of the hydraulic pump is connected to the electromagnetic directional valve through a damping orifice and is also connected to the relief valve. At the same time, feedback is given back to the LS port of the hydraulic pump to control the output pressure of the hydraulic pump.

[0006] Preferably, when the hydraulic control check valve is open, the hydraulic pump P port oil flows through the damping orifice to the relief valve and then back to the oil tank through the hydraulic control check valve.

[0007] Preferably, the outlets of both the low-impact hydraulic control directional valve and the high-impact hydraulic control directional valve are connected to a rock drill.

[0008] Preferably, the system is set with a cut-off pressure value. When the rock drill system needs to work, the electromagnetic reversing valve is energized, and the hydraulic pump outlet pressure P rises to the cut-off pressure value. Hydraulic oil enters the auxiliary system, and the system operates at the set cut-off pressure.

[0009] Preferably, when hydraulic oil with an impact signal enters through the impact signal source port XH, the signal oil will open the hydraulic control check valve, at which point the relief valve will start working, and the system will automatically switch to impact mode.

[0010] Secondly, the present invention provides a control method based on the aforementioned rock drilling hydraulic control system, comprising: When the rock drill is operating in drilling mode, the impact signal oil enters the valve block through the impact signal source port XH. The signal oil opens the hydraulic control check valve, at which point the overflow valve starts working, the propulsion pressure hydraulic control directional valve operates in the off position, and the rotation pressure signal source port XR causes the rotation pressure hydraulic control directional valve to switch and operate in the off position. The low impact signal oil from the low propulsion pressure signal source port XC causes the high-low impact switching hydraulic control directional valve to switch and operate in the off position. The impact signal oil cannot control the high impact hydraulic control directional valve through the high-low impact switching hydraulic control directional valve, so the high impact hydraulic control directional valve operates in the off position. At the same time, the impact signal oil causes the low impact hydraulic control directional valve to switch and operate in the on position. At this time, the hydraulic oil from the hydraulic pump outlet P enters the rock drill through the adjustable flow valve and the low impact hydraulic control directional valve. The adjustable flow valve limits the flow of hydraulic oil entering the rock drill, so the rock drill enters the low impact mode.

[0011] A control method for a rock drilling hydraulic control system includes: When the rock drill is operating in rock drilling mode: Impact signal oil enters the valve block through the impact signal source port XH, opening the hydraulic control check valve, at which point the overflow valve begins to operate; the high propulsion pressure signal source port XF receives the high propulsion pressure value, causing the propulsion pressure hydraulic control directional valve to switch and operate in the on position, while the rotation pressure signal source port XR receives the rotation pressure, causing the rotation pressure hydraulic control directional valve to switch and operate in the off position; the low propulsion pressure signal source port XC receives no signal oil at this time, and the high / low impact switching hydraulic control directional valve operates in the on position. Therefore, the impact signal oil will enter the control port of the high impact hydraulic control valve through the pressure hydraulic control directional valve and the high-low impact switching hydraulic control directional valve, causing the high impact hydraulic control directional valve to switch and operate in the on position. At the same time, the impact signal oil will cause the low impact hydraulic control directional valve to switch and operate in the on position. At this time, the hydraulic oil at the hydraulic pump outlet P will enter the rock drill through the adjustable flow valve, the low impact hydraulic control directional valve and the high impact hydraulic control directional valve, and the rock drill will enter the high impact mode.

[0012] A control method for a rock drilling hydraulic control system includes: When the rock drill is performing a normal high-impact stroke and the drill bit gets stuck, the rock drill will stop when the rotary pressure rises to the set anti-jamming pressure value. The feed pressure value decreases, causing the feed pressure hydraulic control directional valve to return to its original position and operate in the cut-off position. At the same time, the rotary pressure signal source XR causes the rotary pressure hydraulic control directional valve to switch, and the rotary pressure hydraulic control directional valve operates in the cut-off position. At this time, the high-impact hydraulic control directional valve operates in the cut-off position; hydraulic oil can only enter the rock drill through the adjustable flow valve and the low-impact hydraulic control directional valve, and the rock drill automatically enters the low-impact mode. When the drill bit returns to normal, the feed pressure will automatically switch to high feed pressure. The high feed pressure causes the feed pressure hydraulic control directional valve to switch, and the feed pressure hydraulic control directional valve is in the ON position. The impact signal oil from the impact signal source port XH enters the control port of the high impact hydraulic control directional valve through the feed pressure hydraulic control directional valve and the high-low impact switching hydraulic control directional valve, causing the high impact hydraulic control directional valve to switch, and the high impact hydraulic control directional valve is in the ON position. The hydraulic oil from the hydraulic pump outlet P enters the rock drill through the adjustable flow valve, the low impact hydraulic control directional valve, and the high impact hydraulic control directional valve, and the rock drill automatically returns to the high impact mode.

[0013] A control method for a rock drilling hydraulic control system includes: When the drill bit gets stuck and needs to be pulled out, the drilling action stops. The rotary pressure signal source port XR has a rotary pressure of 0, and the rotary pressure hydraulic control directional valve will be in the on position. At the same time, the propulsion pressure value of the high propulsion pressure signal source port XF is also 0, and the propulsion pressure hydraulic control directional valve is in the off position. At this time, the impact signal oil from the impact signal source port XH will pass through the rotary pressure hydraulic control directional valve and the high-impact hydraulic control directional valve to enter the control port of the high-impact hydraulic control directional valve, causing it to switch. At this time, the hydraulic oil from the hydraulic pump outlet P will enter the rock drill through the adjustable flow valve, the low-impact hydraulic control directional valve, and the high-impact hydraulic control directional valve, and the rock drill enters the high-impact mode.

[0014] A control method for a rock drilling hydraulic control system includes: when the rock drill encounters a cavity during normal high-impact operation and the propulsion pressure decreases, the propulsion pressure hydraulic control directional valve switches to the cut-off position. Simultaneously, the rotation pressure value of the rotation pressure signal source port XR switches the rotation pressure hydraulic control directional valve, which operates in the cut-off position. Therefore, the impact signal oil cannot enter the control port of the high-impact hydraulic control directional valve, which operates in the cut-off position. Thus, the hydraulic oil at the hydraulic pump outlet P enters the rock drill through the adjustable flow valve and the low-impact hydraulic control directional valve, and the rock drill enters the low-impact mode.

[0015] Thirdly, the present invention provides a rock drill equipped with the aforementioned rock drilling hydraulic control system.

[0016] The beneficial effects achieved by this invention are as follows: This invention provides a rock drilling hydraulic control system that enables a single plunger pump to control both the rock drilling impact and the auxiliary system. It controls the flow rate of the rock drill through throttling, allowing the rock drill to operate in a low-impact mode, meeting the most direct parameter requirements for rock drill use and precisely controlling the rock drill's impact mode. The anti-jamming function effectively protects the drill bit, reducing drill bit wear and avoiding wasted time and costs due to drill bit jamming. The forced high-impact mode ensures that the impact pressure is unaffected by the thrust, maintaining a consistently high-impact state for higher work efficiency. The anti-dry-firing function effectively distinguishes between dry-firing and normal rock drilling conditions, reducing damage to the rock drill and drill bit during dry-firing. All of these functions improve the overall stability, safety, and performance of the machine. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the hydraulic control principle for rock drilling provided by the present invention; In the diagram: 1. Damping orifice, 2. Solenoid directional valve, 3. Hydraulic check valve, 4. Relief valve, 5. Adjustable flow valve, 6. Low-impact hydraulic directional valve, 7. High-impact hydraulic directional valve, 8. High-low impact switching hydraulic directional valve, 9. Rotary pressure hydraulic directional valve, 10. Propulsion pressure hydraulic directional valve. Detailed Implementation

[0018] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "end", "bottom", "side", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limiting this invention.

[0020] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "installation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a direct connection, or a connection through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances.

[0021] Secondly, the term "an embodiment" or "embodiment" as used in this invention refers to a specific feature, structure, or characteristic that can be included in at least one implementation of this invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0022] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0023] This invention provides a rock drilling hydraulic control system, see [link to relevant documentation]. Figure 1 It includes: damping orifice 1, solenoid directional valve 2, hydraulic control check valve 3, overflow valve 4, adjustable flow valve 5, low impact hydraulic control directional valve 6, high impact hydraulic control directional valve 7, high and low impact switching hydraulic control directional valve 8, rotary pressure hydraulic control directional valve 9, and propulsion pressure hydraulic control directional valve 10.

[0024] In this invention, damping orifice 1 is connected to the hydraulic pump outlet P, electromagnetic directional valve 2 and relief valve 4 are both connected to damping orifice 1, and hydraulic control check valve 3 is connected to relief valve 4; adjustable flow valve 5 is connected to the hydraulic pump outlet, low impact hydraulic control directional valve 6 is connected to adjustable flow valve 5, and high impact hydraulic control directional valve 7 is connected to the hydraulic pump outlet; high and low impact switching hydraulic control directional valve 8 is connected to high impact hydraulic control directional valve 7, rotary pressure hydraulic control directional valve 9 is connected to high and low impact switching hydraulic control directional valve 8, and propulsion pressure hydraulic control directional valve 10 is connected to high and low impact switching hydraulic control directional valve 8.

[0025] In this invention, the electromagnetic directional valve 2 is a two-position, two-way electromagnetic directional valve. The P port of the hydraulic pump is connected to the electromagnetic directional valve 2 through the damping hole 1 and is also connected to the relief valve 4. At the same time, it feeds back to the LS port of the hydraulic pump to control the output pressure of the hydraulic pump.

[0026] In this invention, the inlet of the hydraulic control check valve 3 is connected to the outlet of the overflow valve 4, and the control port of the hydraulic control check valve 3 is connected to the XH port. The XH port is the impact signal source port, which is used to open the hydraulic control check valve 3 when there is an impact pressure signal. The hydraulic pump P port oil flows through the damping hole 1 to the overflow valve 4 and then flows back to the oil tank through the hydraulic control check valve 3.

[0027] In this invention, the outlet of the low-impact hydraulic control directional valve 6 is connected to the rock drill, the inlet is connected to the outlet of the adjustable flow valve 5, the control port is connected to the XH port, and the inlet of the adjustable flow valve 5 is connected to the P port of the hydraulic pump.

[0028] In this invention, the inlet of the high-impact hydraulic control directional valve 7 is connected to the P port of the hydraulic pump, the outlet is connected to the rock drill, and the control port is connected to the outlet of the high-low impact switching hydraulic control directional valve 8. The inlet of the high-low impact switching hydraulic control directional valve 8 is connected to the outlet of the rotary pressure hydraulic control directional valve 9 and the propulsion pressure hydraulic control directional valve 10. The control port of the high-low impact switching hydraulic control directional valve 8 is connected to the XC port, which is a low propulsion pressure signal source port. It is used to switch the high-low impact switching hydraulic control directional valve 8 when there is a low propulsion pressure signal.

[0029] In this invention, the inlet of the rotary pressure hydraulic control directional valve 9 and the inlet of the propulsion pressure hydraulic control directional valve 10 are connected to port XH. The control port of the rotary pressure hydraulic control directional valve 9 is connected to port XR, which is the rotary pressure signal source port, used to switch the rotary pressure hydraulic control directional valve 9 when a rotary pressure signal is received. The control port of the propulsion pressure hydraulic control directional valve 10 is connected to port XF, which is the high propulsion pressure signal source port, used to switch the propulsion pressure hydraulic control directional valve 10 when a high propulsion pressure signal is received.

[0030] The working principle of the above-mentioned rock drilling hydraulic control system is as follows: After the hydraulic pump starts, hydraulic oil enters the control valve through port P. The hydraulic oil then flows through the damping orifice 1 in the valve block and back to the oil tank via the solenoid directional valve 2. Simultaneously, the hydraulic oil is also fed back to the main pump's LS control port via the LS control. When the rock drill system needs to operate, the solenoid directional valve 2 is energized. At this time, the pressure at port P of the hydraulic pump rises to the system's set cut-off pressure value. The hydraulic oil at port P enters the auxiliary system through the check valve, and the system operates at the pump's set cut-off pressure. When an impact signal is received, hydraulic oil enters the valve block through port XH. The signal oil opens the hydraulically controlled check valve 3, and the relief valve 4 begins to operate. Its function is to limit the maximum pressure value of the impact system. Therefore, when an impact signal is received, the system automatically operates in impact mode. This function allows a single piston pump to control auxiliary actions at the pump's cut-off pressure value and automatically switch to impact mode when an impact signal is received.

[0031] The working process of the hydraulic control system for rock drilling under different working modes of the rock drill is as follows: Opening mode: Impact signal hydraulic oil enters the valve block through port XH, opening the hydraulic control check valve 3. At this time, the relief valve 4 begins operation. Because the push pressure at port XF is low, the push pressure hydraulic control directional valve 10 cannot switch, remaining in the off position. Simultaneously, the rotation pressure at port XR causes the rotation pressure hydraulic control directional valve 9 to switch, also remaining in the off position. The low impact signal oil at port XC causes the high / low impact switching hydraulic control directional valve 8 to switch, also remaining in the off position. Therefore, the impact signal oil cannot control the high impact hydraulic control directional valve 7 through the high / low impact switching hydraulic control directional valve 8. Therefore, the high-impact hydraulic control directional valve 7 cannot switch and operates in the off position. At the same time, the XH impact signal hydraulic oil will cause the low-impact hydraulic control directional valve 6 to switch and operate in the on position. At this time, the hydraulic oil at the P port of the hydraulic pump will enter the rock drill through the adjustable flow valve 5 and the low-impact hydraulic control directional valve 6. Since the adjustable flow valve 5 will limit the flow of hydraulic oil entering the rock drill, the rock drill will enter the low-impact mode.

[0032] Rock drilling mode: Impact signal hydraulic oil enters the valve block through port XH, opening the hydraulic control check valve 3, at which point the relief valve 4 begins operation. Since the propulsion pressure at port XF is at a high propulsion pressure, the propulsion pressure hydraulic control directional valve 10 is switched, operating in the on position. Simultaneously, the rotation pressure at port XR causes the rotation pressure hydraulic control directional valve 9 to switch, operating in the off position. At this time, there is no signal oil at port XC, and the high / low impact switching hydraulic control directional valve 8 is in the ON position. Therefore, the impact signal oil at port XH will pass through the push pressure hydraulic control directional valve 10, and then through the high / low impact switching hydraulic control directional valve 8 to enter the control port of the high impact hydraulic control directional valve 7, causing the high impact hydraulic control directional valve 7 to switch and operate in the ON position. At the same time, the XH impact signal hydraulic oil will cause the low impact hydraulic control directional valve 6 to switch and operate in the ON position. At this time, the hydraulic oil at port P of the hydraulic pump will enter the rock drill through the adjustable flow valve 5, the low impact hydraulic control directional valve 6, and the high impact hydraulic control directional valve 7. At this time, the flow rate entering the rock drill increases, and the rock drill enters the high impact mode.

[0033] Anti-jamming mode When the rock drill is performing a normal high-impact stroke, if the drill bit gets stuck, the rotary pressure will increase. When the rotary pressure rises to the set anti-jamming pressure value, the rock drill will stop. At this time, due to the decrease in the feed pressure value, the feed pressure hydraulic control directional valve 10 will return to its original position and operate in the cut-off position. At the same time, the rotary pressure at the XR port will cause the rotary pressure hydraulic control directional valve 9 to switch, and the rotary pressure hydraulic control directional valve 9 will operate in the cut-off position. This means that the hydraulic oil for the impact signal of XH cannot enter the signal port of the high-impact hydraulic control directional valve 7, and the high-impact hydraulic control directional valve 7 will operate in the cut-off position. Hydraulic oil can only enter the rock drill through the adjustable flow valve 5 and the low-impact hydraulic control directional valve 6. Since the adjustable flow valve 5 restricts the flow of hydraulic oil into the rock drill at this time, the rock drill automatically enters the low-impact mode. When the drill bit returns to normal, the propulsion pressure will automatically switch to the high propulsion pressure. The high propulsion pressure causes the propulsion pressure hydraulic control directional valve 10 to switch. The propulsion pressure hydraulic control directional valve 10 is in the on position. The impact signal oil from port XH will enter the control port of the high-impact hydraulic control directional valve 7 through the propulsion pressure hydraulic control directional valve 10 and the high-low impact switching hydraulic control directional valve 8, causing the high-impact hydraulic control directional valve 7 to switch. The high-impact hydraulic control directional valve 7 is in the on position. The hydraulic oil from port P of the hydraulic pump will enter the rock drill through the adjustable flow valve 5, the low-impact hydraulic control directional valve 6, and the high-impact hydraulic control directional valve 7. At this time, the flow rate into the rock drill increases, and the rock drill automatically returns to the high-impact mode.

[0034] Forced high-speed mode When the drill bit gets stuck and needs to be pulled out, the drilling action stops, the XR port rotary pressure is 0, the rotary pressure hydraulic control valve 9 will be in the on position, and the XF feed pressure value is also 0, the feed pressure hydraulic control valve 10 will be in the off position. At this time, the impact signal oil of the XH port will pass through the rotary pressure hydraulic control valve 9 and the high-low impact switching hydraulic control valve 8 to enter the control port of the high impact hydraulic control valve 7, causing it to switch. At this time, the hydraulic oil of the hydraulic pump P port will enter the rock drill through the adjustable flow valve 5, the low impact hydraulic control valve 6 and the high impact hydraulic control valve 7. At this time, the flow rate into the rock drill increases, and the rock drill enters the high impact mode.

[0035] Anti-aircraft mode When the rock drill encounters a cavity during normal high-impact operation, the propulsion pressure will suddenly decrease, i.e., the pressure at port XF decreases. At this time, the propulsion pressure hydraulic control valve 10 will switch to the cut-off position. Simultaneously, because the rotation pressure value at port XR will switch the rotation pressure hydraulic control valve 9, which will also be in the cut-off position. Therefore, the impact signal oil from port XH cannot enter the control port of the high-impact hydraulic control valve 7, which will also be in the cut-off position. Consequently, the hydraulic oil from port P of the hydraulic pump will enter the rock drill through the adjustable flow valve 5 and the low-impact hydraulic control valve 6. Since the adjustable flow valve 5 restricts the flow of hydraulic oil into the rock drill, the rock drill will enter the low-impact mode.

[0036] Based on this, the present invention also provides a rock drill configured with the rock drilling hydraulic control system disclosed above.

[0037] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0038] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims.

Claims

1. A rock drilling hydraulic control system, characterized in that, include: Damping orifice (1), solenoid directional valve (2), hydraulic check valve (3), overflow valve (4), adjustable flow valve (5), low impact hydraulic directional valve (6), high impact hydraulic directional valve (7), high and low impact switching hydraulic directional valve (8), rotary pressure hydraulic directional valve (9) and propulsion pressure hydraulic directional valve (10). The damping hole (1) is connected to the hydraulic pump outlet P, and the electromagnetic reversing valve (2) and the relief valve (4) are both connected to the damping hole (1). The inlet of the hydraulic control check valve (3) is connected to the outlet of the overflow valve (4), and the control port of the hydraulic control check valve (3) is connected to the impact signal source port XH, which is used to open the hydraulic control check valve (3) when there is an impact signal. The inlets of the adjustable flow valve (5) and the high-impact hydraulic control directional valve (7) are both connected to the outlet of the hydraulic pump. The outlet of the adjustable flow valve (5) is connected to the inlet of the low-impact hydraulic control directional valve (6). The control port of the low-impact hydraulic control directional valve (6) is connected to the impact signal source port XH, which is used to switch the low-impact hydraulic control directional valve (6) when there is an impact signal. The control port of the high-impact hydraulic control directional valve (7) is connected to the outlet of the high-low impact switching hydraulic control directional valve (8); the control port of the high-low impact switching hydraulic control directional valve (8) is connected to the low propulsion pressure signal source port XC, which is used to switch the high-low impact switching hydraulic control directional valve (8) when there is a low propulsion pressure signal. The inlet of the rotary pressure hydraulic control directional valve (9) is connected to the impact signal source port XH, and the control port is connected to the rotary pressure signal source port XR; The inlet of the propulsion pressure hydraulic control directional valve (10) is connected to the impact signal source port XH, and the control port is connected to the high propulsion pressure signal source port XF; The outlets of the rotary pressure hydraulic control directional valve (9) and the propulsion pressure hydraulic control directional valve (10) are both connected to the inlet of the high-low stroke switching hydraulic control directional valve (8).

2. The rock drilling hydraulic control system according to claim 1, characterized in that: The electromagnetic directional valve (2) is a two-position, two-way electromagnetic directional valve. The P port of the hydraulic pump is connected to the electromagnetic directional valve (2) through the damping hole (1) and connected to the relief valve (4). At the same time, it feeds back to the LS port of the hydraulic pump to control the output pressure of the hydraulic pump.

3. The rock drilling hydraulic control system according to claim 1, characterized in that: When the hydraulic control check valve (3) is opened, the hydraulic pump P port oil flows through the damping hole (1) to the overflow valve (4) and then flows back to the oil tank through the hydraulic control check valve (3).

4. The rock drilling hydraulic control system according to claim 1, characterized in that: The outlets of both the low-impact hydraulic control valve (6) and the high-impact hydraulic control valve (7) are connected to a rock drill.

5. A rock drilling hydraulic control system according to claim 1, characterized in that: The system is set with a cut-off pressure value. When the rock drill system needs to work, the electromagnetic reversing valve is energized, and the hydraulic pump outlet pressure P rises to the cut-off pressure value. Hydraulic oil enters the auxiliary system, and the system operates at the set cut-off pressure.

6. A rock drilling hydraulic control system according to claim 1, characterized in that: When hydraulic oil enters through the impact signal source port XH, the system will open the hydraulic control check valve. At this time, the relief valve will start working, and the system will automatically switch to impact mode.

7. The control method based on the rock drilling hydraulic control system according to claim 1, characterized in that, include: When the rock drill is operating in drilling mode, the impact signal oil enters the valve block through the impact signal source port XH. The signal oil opens the hydraulic control check valve, at which point the overflow valve starts working, the propulsion pressure hydraulic control directional valve operates in the off position, and the rotation pressure signal source port XR causes the rotation pressure hydraulic control directional valve to switch and operate in the off position. The low impact signal oil from the low propulsion pressure signal source port XC causes the high-low impact switching hydraulic control directional valve to switch and operate in the off position. The impact signal oil cannot control the high impact hydraulic control directional valve through the high-low impact switching hydraulic control directional valve, so the high impact hydraulic control directional valve operates in the off position. At the same time, the impact signal oil causes the low impact hydraulic control directional valve to switch and operate in the on position. At this time, the hydraulic oil from the hydraulic pump outlet P enters the rock drill through the adjustable flow valve and the low impact hydraulic control directional valve. The adjustable flow valve limits the flow of hydraulic oil entering the rock drill, so the rock drill enters the low impact mode.

8. The control method based on the rock drilling hydraulic control system according to claim 1, characterized in that, include: When the rock drill is operating in rock drilling mode: Impact signal oil enters the valve block through the impact signal source port XH, opening the hydraulic control check valve, at which point the overflow valve begins to operate; the high propulsion pressure signal source port XF receives the high propulsion pressure value, causing the propulsion pressure hydraulic control directional valve to switch and operate in the on position, while the rotation pressure signal source port XR receives the rotation pressure, causing the rotation pressure hydraulic control directional valve to switch and operate in the off position; the low propulsion pressure signal source port XC receives no signal oil at this time, and the high / low impact switching hydraulic control directional valve operates in the on position. Therefore, the impact signal oil will enter the control port of the high impact hydraulic control valve through the pressure hydraulic control directional valve and the high-low impact switching hydraulic control directional valve, causing the high impact hydraulic control directional valve to switch and operate in the on position. At the same time, the impact signal oil will cause the low impact hydraulic control directional valve to switch and operate in the on position. At this time, the hydraulic oil at the hydraulic pump outlet P will enter the rock drill through the adjustable flow valve, the low impact hydraulic control directional valve and the high impact hydraulic control directional valve, and the rock drill will enter the high impact mode.

9. The control method based on the rock drilling hydraulic control system according to claim 1, characterized in that, include: When the rock drill is performing a normal high-impact stroke and the drill bit gets stuck, the rock drill will stop when the rotary pressure rises to the set anti-jamming pressure value. The feed pressure value decreases, causing the feed pressure hydraulic control directional valve to return to its original position and operate in the cut-off position. At the same time, the rotary pressure signal source XR causes the rotary pressure hydraulic control directional valve to switch, and the rotary pressure hydraulic control directional valve operates in the cut-off position. At this time, the high-impact hydraulic control directional valve operates in the cut-off position; hydraulic oil can only enter the rock drill through the adjustable flow valve and the low-impact hydraulic control directional valve, and the rock drill automatically enters the low-impact mode. When the drill bit returns to normal, the feed pressure will automatically switch to high feed pressure. The high feed pressure causes the feed pressure hydraulic control directional valve to switch, and the feed pressure hydraulic control directional valve is in the ON position. The impact signal oil from the impact signal source port XH enters the control port of the high impact hydraulic control directional valve through the feed pressure hydraulic control directional valve and the high-low impact switching hydraulic control directional valve, causing the high impact hydraulic control directional valve to switch, and the high impact hydraulic control directional valve is in the ON position. The hydraulic oil from the hydraulic pump outlet P enters the rock drill through the adjustable flow valve, the low impact hydraulic control directional valve, and the high impact hydraulic control directional valve, and the rock drill automatically returns to the high impact mode.

10. A control method based on the rock drilling hydraulic control system according to claim 1, characterized in that, include: When the drill bit gets stuck and needs to be pulled out, the drilling action stops. The rotary pressure signal source port XR has a rotary pressure of 0, and the rotary pressure hydraulic control directional valve will be in the on position. At the same time, the propulsion pressure value of the high propulsion pressure signal source port XF is also 0, and the propulsion pressure hydraulic control directional valve is in the off position. At this time, the impact signal oil from the impact signal source port XH will pass through the rotary pressure hydraulic control directional valve and the high-impact hydraulic control directional valve to enter the control port of the high-impact hydraulic control directional valve, causing it to switch. At this time, the hydraulic oil from the hydraulic pump outlet P will enter the rock drill through the adjustable flow valve, the low-impact hydraulic control directional valve, and the high-impact hydraulic control directional valve, and the rock drill enters the high-impact mode.

11. The control method based on the rock drilling hydraulic control system according to claim 1, characterized in that, include: When the rock drill encounters a cavity during normal high-impact operation, the propulsion pressure decreases. The propulsion pressure hydraulic control directional valve switches to the cut-off position. Simultaneously, the rotation pressure value at the rotation pressure signal source port XR switches the rotation pressure hydraulic control directional valve, which then operates in the cut-off position. Therefore, the impact signal oil cannot enter the control port of the high-impact hydraulic control directional valve, which operates in the cut-off position. Consequently, the hydraulic oil at the hydraulic pump outlet P enters the rock drill through the adjustable flow valve and the low-impact hydraulic control directional valve, and the rock drill enters the low-impact mode.

12. A rock drill, characterized in that, Configure the rock drilling hydraulic control system as described in claim 1.

Images