Rock drill and control system thereof

Abstract

The application discloses a rock drill and a control system thereof. The control system is used for controlling a drill bit of the rock drill. The control system comprises an impact oil cylinder, a propelling oil cylinder, an impact control valve, a propelling sensor and a controller. The controller is electrically connected to the propelling sensor. The impact control valve is hydraulically connected to the impact oil cylinder. The controller is electrically connected to the impact control valve to obtain a flow of an oil circuit of the impact oil cylinder which is matched with a pressure of an oil circuit of the propelling oil cylinder when the pressure of the oil circuit of the propelling oil cylinder detected by the propelling sensor changes. The rock drill and the control system thereof have the beneficial effect that the impact frequency of the impact oil cylinder is matched with the pressure of the oil circuit of the propelling oil cylinder.

Description

Technical Field

[0001] This application belongs to the field of control, and more specifically, relates to a rock drill and its control system. Background Technology

[0002] Rock drills are widely used in mining, tunneling, hydropower, and construction. With the increasing automation in my country's mining, tunneling, and hydropower construction sectors, rock drills are becoming increasingly indispensable in rock drilling projects. Current impact technologies typically employ two-stage flow control or two-stage pressure control to control the impact frequency, which cannot achieve a match between the impact frequency and the propulsion speed.

[0003] In related technologies, Chinese patent document CN204704173U discloses a hydraulically controlled check valve connected in series in the main hydraulic oil circuit. The check valve is forward-biased from the propulsion mechanism to the hydraulic pump. The control port of the check valve is connected to the main hydraulic oil circuit via a pilot control oil circuit, positioned between the check valve and the hydraulic pump. A first control valve is connected in series in the pilot control oil circuit to control whether the check valve is reverse-biased. A speed control oil circuit is connected in parallel to the check valve, and a speed regulating valve is connected in series in the speed control oil circuit to control the propulsion speed of the hydraulic rock drill. However, this related technology does not provide any technical inspiration for solving the problem of the impact frequency not matching the propulsion speed. Summary of the Invention

[0004] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0005] To address the technical problems mentioned in the background section, as a first aspect of this application, some embodiments of this application provide a control system for controlling the drill bit of a rock drill. The control system includes an impact cylinder, a feed cylinder, an impact control valve, a feed sensor, and a controller. The impact cylinder provides power to cause the drill bit to impact the rock to be drilled. The feed cylinder provides power to advance the drill bit. The impact control valve controls the flow rate in the oil circuit where the impact cylinder is located. The feed sensor detects the pressure in the oil circuit where the feed cylinder is located. The controller is electrically connected to the feed sensor. The impact control valve is hydraulically connected to the impact cylinder. The controller is electrically connected to the impact control valve to obtain a flow rate in the oil circuit where the impact cylinder is located that is adapted to the pressure in the oil circuit where the feed cylinder is located when the pressure detected by the feed sensor changes.

[0006] Furthermore, the impact control valve is configured as a proportional flow valve.

[0007] Furthermore, the control system also includes propulsion control, a rotary motor, and a rotation sensor. The propulsion control valve controls the pressure in the hydraulic circuit where the propulsion cylinder is located. The rotary motor provides power to rotate the drill bit. The rotation sensor detects the pressure in the hydraulic circuit where the rotary motor is located. The propulsion control valve is hydraulically connected to the propulsion cylinder. The controller is electrically connected to the rotation sensor. The controller is also electrically connected to the propulsion control valve to acquire the pressure in the hydraulic circuit where the propulsion cylinder is located, which is adapted to the pressure in the hydraulic circuit where the rotary motor is located, when the rotation sensor detects a change in the pressure in the hydraulic circuit where the rotary motor is located.

[0008] Furthermore, the propulsion control valve is configured as a proportional pressure reducing valve.

[0009] Furthermore, the control system also includes a hydraulic pump, a first switch, a second switch, and a pressure control valve. The hydraulic pump is hydraulically connected to the impact cylinder and the propulsion cylinder. The first switch is electrically connected to the controller. The second switch is also electrically connected to the controller. The pressure control valve has a first state that controls the hydraulic pump to output lower pressure hydraulic oil and a second state that controls the hydraulic pump to output higher pressure hydraulic oil. The controller is electrically connected to the pressure control valve to control the pressure control valve to switch to the first state when the first switch is closed and / or to control the pressure control valve to switch to the second state when the second switch is closed.

[0010] Furthermore, the control system also includes a propulsion on / off valve. This valve is hydraulically connected to the propulsion cylinder. The controller is electrically connected to the propulsion on / off valve.

[0011] Furthermore, the control system also includes a propulsion directional valve. The propulsion directional valve is hydraulically connected to the propulsion cylinder. The controller is electrically connected to the propulsion directional valve.

[0012] Furthermore, the control system also includes a first speed control valve, a second speed control valve, and a speed control directional valve. The first speed control valve is hydraulically connected at one end to the rotary motor. The second speed control valve is also hydraulically connected at one end to the rotary motor. The speed control directional valve has a third state where it is hydraulically connected to the other end of the first speed control valve and a fourth state where it is hydraulically connected to the other end of the second speed control valve. The upper limit of the flow rate regulated by the first speed control valve is lower than the upper limit of the flow rate regulated by the second speed control valve.

[0013] Furthermore, the control system also includes a safety valve assembly. This safety valve assembly is hydraulically connected to the rotary motor to depressurize the oil circuit when the pressure in the oil circuit containing the rotary motor exceeds a second preset threshold.

[0014] As a second aspect of this application, some embodiments of this application claim protection for a rock drill, which includes a drill bit and the aforementioned control system.

[0015] The beneficial effects of this application are as follows:

[0016] The control system includes an impact cylinder, a propulsion cylinder, an impact control valve, a propulsion sensor, and a controller to match the impact frequency of the impact cylinder with the pressure of the oil circuit where the propulsion cylinder is located.

[0017] More specifically, some embodiments of this application may produce the following specific beneficial effects:

[0018] The control system also includes a propulsion control valve, a rotary motor, and a rotation sensor, enabling the propulsion cylinder and impact cylinder to adjust according to the real-time status of the rotary motor. This ensures that the rock drill operates in good condition, improving drilling efficiency while reducing the possibility of drill bit damage.

[0019] The control system also includes a propulsion on / off valve that enables the controller to determine when the pressure in the oil circuit where the rotary motor is located, detected by the rotary sensor, reaches a first preset threshold, so as to stop the propulsion cylinder from advancing and prevent the rock drill from jamming.

[0020] The control system also includes a first speed control valve, a second speed control valve, and a speed control reversing valve, which keeps the rock drill in a high-speed, low-speed state when drilling in hard rock formations, effectively reducing drill bit wear. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.

[0022] Throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements are not necessarily drawn to scale.

[0023] In the attached diagram:

[0024] Figure 1 This is a schematic diagram of the overall structure of a rock drill according to one embodiment of this application;

[0025] Figure 2 This is an architecture diagram of the control system of this application;

[0026] Figure 3 for Figure 1 A schematic diagram of the control system in the illustrated embodiment;

[0027] Figure 4 for Figure 1 A schematic diagram of the impact control valve in the illustrated embodiment;

[0028] Figure 5 for Figure 1 A schematic diagram of the propulsion control valve in the embodiment shown;

[0029] Figure 6 for Figure 1 A schematic diagram showing the connection relationship between the first shuttle valve and the rotary sensor in the illustrated embodiment;

[0030] Figure 7 for Figure 1 A schematic diagram showing the connection relationship between the first shuttle valve and the impact directional valve in the embodiment shown.

[0031] Figure 8 for Figure 1 A schematic diagram of the push-on / off valve in the embodiment shown;

[0032] Figure 9 for Figure 1 A schematic diagram of the propulsion reversing valve in the embodiment shown;

[0033] Figure 10 for Figure 1 A schematic diagram showing the connection relationship of the first speed control valve and the speed control reversing valve in the embodiment shown.

[0034] Figure 11 for Figure 1 A schematic diagram of the safety valve assembly in the embodiment shown;

[0035] Figure 12 for Figure 1 A schematic diagram showing the connection relationship between the various electronic control components in the illustrated embodiment.

[0036] Meaning of the reference numerals in the attached figures:

[0037] 100. Rock drill; 101. Drill bit;

[0038] 200. Control system; 201. Impact cylinder; 202. Propulsion cylinder; 202a. Rod chamber; 202b. Rodless chamber; 203. Impact control valve; 204. Propulsion sensor; 205. Controller; 206. Propulsion control valve; 207. Rotary motor; 208. Rotation sensor; 209. First shuttle valve; 209a. First oil inlet; 209b. Second oil inlet; 209c. First oil outlet;

[0039] 210. Hydraulic pump; 211. First switch; 212. Second switch; 213. Pressure control valve; 214. Impact directional valve; 214a. First control port; 214b. Second control port; 215. Second shuttle valve; 215a. Third inlet; 215b. Fourth inlet; 215c. Second outlet; 216. Propulsion on / off valve; 216a. Fifth inlet; 216b. First return valve Oil port; 216c, third control oil port; 216d, first valve core; 216e, first coil; 217, propulsion reversing valve; 217a, sixth oil inlet; 217b, second return oil port; 217c, third return oil port; 217d, fourth control oil port; 217e, fifth control oil port; 217f, second valve core; 217g, second coil; 218, first speed control valve; 219, second speed control valve;

[0040] 220. Speed ​​control reversing valve; 220a. Seventh oil inlet; 220b. Third oil outlet; 220c. Fourth oil outlet; 220d. Third valve core; 220e. Handle; 221. Safety valve assembly; 221a. Overflow valve; 222. Impact buffer mechanism. Detailed Implementation

[0041] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0042] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Features in the embodiments of this disclosure can be combined with each other unless otherwise specified.

[0043] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0044] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0045] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] Reference Figures 1 to 12As shown, this embodiment provides a rock drill 100. The rock drill 100 includes a drill bit 101 and a control system 200. The control system 200 controls the drill bit 101 and includes an impact cylinder 201, a feed cylinder 202, an impact control valve 203, a feed sensor 204, and a controller 205. The impact cylinder 201 provides power to cause the drill bit 101 to impact the rock to be drilled. The feed cylinder 202 provides power to advance the drill bit 101. The impact control valve 203 controls the flow rate in the oil circuit where the impact cylinder 201 is located. The feed sensor 204 detects the pressure in the oil circuit where the feed cylinder 202 is located. The controller 205 is electrically connected to the feed sensor 204. The impact control valve 203 is hydraulically connected to the impact cylinder 201. The controller 205 is electrically connected to the impact control valve 203 to obtain the flow rate of the impact cylinder 201 in the oil circuit that is adapted to the pressure of the oil circuit where the propulsion cylinder 202 is located when the pressure of the oil circuit where the propulsion cylinder 202 is located is detected by the propulsion sensor 204. The specific connection relationships between the various parts of the control system 200 will be described in detail later.

[0047] Using the above technical solution, the propulsion sensor 204 detects the pressure value of the oil circuit where the propulsion cylinder 202 is located and converts it into an electrical signal, which is then transmitted to the controller 205. In this embodiment, the control system 200 also includes a proportional amplifier. The controller 205 sends a control signal to the proportional amplifier based on the received electrical signal. The proportional amplifier outputs a corresponding current signal to control the opening degree of the impact control valve 203, thereby controlling the set flow rate of the impact control valve 203, which in turn controls the flow rate of the oil circuit where the impact control valve 203 is located, and indirectly controls the impact frequency of the impact cylinder 201, so that the impact frequency of the impact cylinder 201 matches the pressure of the oil circuit where the propulsion cylinder 202 is located. The controller 205 includes a PLC, which is a programmable logic controller. Alternatively, the controller 205 can also be integrated into an ECU.

[0048] More specifically, refer to Figure 4 As shown, in this embodiment, the impact control valve 203 is configured as a proportional flow valve. The proportional flow valve can adjust the flow rate by changing the valve opening according to the electrical signal transmitted to the coil. Since the electrical signal is transmitted quickly, the proportional flow valve can respond quickly to the pressure signal detected by the propulsion sensor 204 and adjust the impact frequency of the impact cylinder 201.

[0049] More specifically, the control system 200 also includes a propulsion control valve 206, a rotary motor 207, and a rotation sensor 208. The propulsion control valve 206 controls the pressure in the hydraulic circuit where the propulsion cylinder 202 is located. The rotary motor 207 provides power to rotate the drill bit 101. The rotation sensor 208 detects the pressure in the hydraulic circuit where the rotary motor 207 is located. The propulsion control valve 206 is hydraulically connected to the propulsion cylinder 202. The controller 205 is electrically connected to the rotation sensor 208. The controller 205 is electrically connected to the propulsion control valve 206 to acquire the pressure in the hydraulic circuit of the propulsion cylinder 202 that matches the pressure in the hydraulic circuit of the rotary motor 207 when the rotation sensor 208 detects a change in pressure in the hydraulic circuit of the rotary motor 207. More specifically, refer to... Figure 5 As shown, in this embodiment, the propulsion control valve 206 is configured as a proportional pressure reducing valve.

[0050] Using the above technical solution, the rotation sensor 208 detects the pressure in the oil circuit where the rotary motor 207 is located and converts it into an electrical signal, which is then transmitted to the controller 205. In this embodiment, the controller 205 sends an electrical signal to the propulsion control valve 206 to the proportional amplifier based on the received electrical signal. The proportional amplifier outputs a corresponding current signal, which in turn controls the set pressure of the propulsion control valve 206, thereby adjusting the pressure in the oil circuit where the propulsion cylinder 202 is located, and thus indirectly controlling the propulsion speed of the propulsion cylinder 202, so that the propulsion speed of the propulsion cylinder 202 matches the pressure in the oil circuit where the rotary motor 207 is located. In this way, when the pressure in the oil circuit where the rotary motor 207 is located changes, the propulsion control valve 206 controls the propulsion speed of the propulsion cylinder 202 to match the rotation speed of the rotary motor 207. At the same time, the propulsion sensor 204 detects the pressure in the oil circuit where the propulsion cylinder 202 is located and transmits it to the controller 205, which in turn controls the impact control valve 203, and finally controls the impact frequency of the impact cylinder 201. This achieves real-time adaptation of the working states of the propulsion cylinder 202, the impact cylinder 201, and the rotary motor 207.

[0051] In this embodiment, the pressure of the oil circuit under test is detected by the sensor and converted into an electrical signal, which is then transmitted to the controller 205. The controller 205 then sends control signals to each control valve. Compared with the traditional hydraulic system, which relies on hydraulic oil to directly drive the directional valve core to change its position, or on the pure hydraulic control method that controls the pressure of the oil circuit by setting the set value of the pressure regulating valve, the electronic control components used in this embodiment enable faster signal transmission, more rapid response of each control valve, and lower maintenance difficulty and cost. In this way, it can be ensured that the propulsion cylinder 202 and the impact cylinder 201 can make adjustments according to the real-time status of the rotary motor 207, allowing the rock drill 100 to perform rock drilling work in good condition, improving rock drilling efficiency and reducing the possibility of drill bit damage.

[0052] Furthermore, the use of the proportional flow valve and proportional pressure reducing valve in this embodiment enables the flow rate of the oil circuit where the impact cylinder 201 is located and the pressure of the oil circuit where the propulsion cylinder 202 is located to match the pressure of the oil circuit where the rotary motor 207 is located, which can adapt to various complex working conditions and break the limitation of the traditional hydraulic system where the impact cylinder 201 or the propulsion cylinder 202 can only achieve two-level control.

[0053] More specifically, refer to Figure 6 As shown, the control system 200 also includes a first shuttle valve 209. The first shuttle valve 209 has a first oil inlet 209a, a second oil inlet 209b, and a first oil outlet 209c. The first oil inlet 209a is hydraulically connected to one end of the rotary motor 207, and the second oil inlet 209b is hydraulically connected to the other end of the rotary motor 207. The first oil outlet 209c is hydraulically connected to the rotation sensor 208.

[0054] Using the above technical solution, the first shuttle valve 209 is hydraulically connected to the two control ports of the rotary motor 207, and selects the higher pressure hydraulic oil to flow to the first oil outlet 209c and then to the rotary sensor 208, so as to ensure that the rotary sensor 208 can detect the maximum pressure of the oil circuit where the rotary motor 207 is located and accurately reflect the real-time status of the rotary motor 207.

[0055] More specifically, the control system 200 also includes a hydraulic pump 210, a first switch 211, a second switch 212, and a pressure control valve 213. The hydraulic pump 210 is hydraulically connected to the impact cylinder 201 and the propulsion cylinder 202. The first switch 211 is electrically connected to the controller 205. The second switch 212 is electrically connected to the controller 205. The pressure control valve 213 has a first state controlling the hydraulic pump 210 to output lower pressure hydraulic oil and a second state controlling the hydraulic pump 210 to output higher pressure hydraulic oil. The controller 205 is electrically connected to the pressure control valve 213 to control the pressure control valve 213 to switch to the first state when the first switch 211 is closed and / or to control the pressure control valve 213 to switch to the second state when the second switch 212 is closed.

[0056] Using the above technical solution, when the rock drill 100 is required to be in a low impact frequency and low propulsion pressure state during the drilling process, the first switch 211 is closed, the controller 205 transmits an electrical signal to the pressure control valve 213 and controls the pressure control valve 213 to switch to the first state. At this time, the pressure of the hydraulic oil output by the hydraulic pump 210 is low, so that the rock drill 100 is in a low impact frequency and low propulsion pressure state.

[0057] When the rock drill 100 is required to be in a state of high impact frequency and high propulsion pressure during the drilling process, the second switch 212 is closed, the controller 205 transmits an electrical signal to the pressure control valve 213 and controls the pressure control valve 213 to switch to the second state. At this time, the hydraulic pump 210 outputs hydraulic oil at a higher pressure, so that the rock drill 100 is in a state of high impact frequency and high propulsion pressure.

[0058] Users can control the pressure of hydraulic oil output by hydraulic pump 210 by controlling whether the first switch 211 and the second switch 212 are closed, thereby changing the maximum pressure of the oil circuit where the propulsion cylinder 202 and the impact cylinder 201 are located to adapt to different working conditions.

[0059] More specifically, refer to Figure 7 As shown, the first switch 211 is configured as a pressure switch. The second switch 212 is configured as a pressure switch. The pressure control valve 213 is configured as a pressure shut-off valve. The control system 200 also includes an impact directional valve 214 and a second shuttle valve 215. The impact directional valve 214 has a first control port 214a and a second control port 214b. The second shuttle valve 215 has a third inlet port 215a, a fourth inlet port 215b, and a second outlet port 215c. The first control port 214a is hydraulically connected to the first switch 211. The second control port 214b is hydraulically connected to the second switch 212. The first control port 214a is hydraulically connected to the first inlet port 209a. The second control port 214b is hydraulically connected to the second inlet port 209b. The first outlet port 209c is hydraulically connected to the impact cylinder 201.

[0060] Using the above technical solution, when the rock drill 100 is in the drilling condition, it is required that the rock drill 100 drills rock under a low impact frequency and low propulsion pressure. At this time, the valve core position of the impact reversing valve 214 is manually controlled so that the hydraulic oil flows out from the first control port and flows to the third oil inlet 215a, and no hydraulic oil flows out from the second control oil port 214b. Due to the presence of the second shuttle valve 215, hydraulic oil cannot flow to the second control port 214b and the fourth inlet port 215b. The hydraulic oil flows to the first switch 211 and then through the second shuttle valve 215 to the impact cylinder 201. At this time, the first switch 211 closes and transmits an electrical signal to the controller 205. The controller 205 sends a control signal to the pressure control valve 213 according to the received electrical signal, causing the pressure control valve 213 to lose power. In this embodiment, after the pressure control valve 213 loses power, the pump head pressure of the hydraulic pump 210 switches to 130 bar, the pressure upper limit of the propulsion control valve 206 is adjusted to 40 bar, and the rock drill 100 enters the drilling mode.

[0061] When the rock drill 100 is in drilling mode, it is required to drill under high impact frequency and high propulsion pressure. At this time, the valve core position of the impact reversing valve 214 is manually controlled, so that hydraulic oil flows out from the second control port and flows to the fourth inlet port 215b, and no hydraulic oil flows out from the first control port 214a. Due to the presence of the second shuttle valve 215, the hydraulic oil cannot flow to the first control port 214a and the third inlet port 215a. The hydraulic oil flows to the second switch 212 and flows to the impact cylinder 201 through the second shuttle valve 215. At this time, the second switch 212 closes and transmits an electrical signal to the controller 205. The controller 205 sends a control signal to the pressure control valve 213 according to the received electrical signal, so that the pressure control valve 213 is energized. In this embodiment, after the pressure control valve 213 is energized, the pump head pressure of the hydraulic pump 210 is switched to 210 bar, the pressure upper limit of the propulsion control valve 206 is adjusted to 80 bar, and the rock drill 100 enters the drilling mode.

[0062] More specifically, the control system 200 also includes a propulsion on / off valve 216. The propulsion on / off valve 216 is hydraulically connected to the propulsion cylinder 202. The controller 205 is electrically connected to the propulsion on / off valve 216.

[0063] More specifically, refer to Figure 8 As shown, the push-on / off valve 216 is configured as a two-position three-way solenoid directional valve. The push cylinder 202 has a rod chamber 202a and a rodless chamber 202b. The two-position three-way solenoid directional valve is provided with a fifth inlet port 216a, a first return port 216b, and a third control port 216c. The two-position three-way solenoid directional valve includes a first valve core 216d and a first coil 216e. The third control port 216c is hydraulically connected to the rodless chamber 202b. When the valve core is in the first position, the fifth inlet port 216a and the third control port 216c are connected, and the push cylinder 202 is in the push-on state. When the valve core is in the second position, the first return port 216b and the third control port 216c are connected, and the push cylinder 202 is in the stopped push-on state.

[0064] Using the above technical solution, the rotation sensor 208 transmits an electrical signal to the controller 205. When the controller 205 determines that the pressure in the oil circuit where the rotation motor 207 is located has reached the first preset threshold, it transmits an electrical signal to the first coil 216e to switch the first valve core 216d from the first position to the second position. At this time, the third control oil port 216c and the first return oil port 216b are connected, the rodless chamber 202b of the push cylinder 202 is depressurized, and the push cylinder 202 stops pushing to prevent the rock drill 100 from continuing to move forward and causing the drill bit to jam.

[0065] More specifically, the control system 200 also includes a propulsion directional valve 217. The propulsion directional valve 217 is hydraulically connected to the propulsion cylinder 202. The controller 205 is electrically connected to the propulsion directional valve 217.

[0066] More specifically, refer to Figure 9 As shown, the propulsion directional valve 217 is configured as a two-position five-way solenoid directional valve. The propulsion directional valve 217 has a sixth inlet port 217a, a second return port 217b, a third return port 217c, a fourth control port 217d, and a fifth control port 217e. The fourth control port 217d is hydraulically connected to the rodless chamber 202b. The fifth control port 217e is hydraulically connected to the rod chamber 202a. The propulsion directional valve 217 includes a second valve core 217f and a second coil 217g. The second coil 217g is electrically connected to the controller 205.

[0067] Using the above technical solution, when the second valve core 217f is in the third position, the sixth oil inlet 217a and the fourth control oil port 217d are connected, and the second oil return port 217b and the fifth control oil port 217e are connected, and the propulsion cylinder 202 is in the propulsion state. When the second valve core 217f is in the fourth position, the sixth oil inlet 217a and the fifth control oil port 217e are connected, and the third oil return port 217c and the fourth control oil port 217d are connected, and the propulsion cylinder 202 is in the retraction state.

[0068] When the rotation sensor 208 detects that the pressure in the oil circuit where the rotation motor 207 is located reaches the first preset threshold, and the controller 205 controls the first return oil port 216b and the third control oil port 216c of the propulsion on / off valve 216 to connect, if the rotation sensor 208 detects that the pressure in the oil circuit where the rotation motor 207 is located continues to rise, the controller 205 sends an electrical signal to the second coil 217g to change the position of the second valve core 217f from the third position to the fourth position so that the impact cylinder 201 switches to the retraction state.

[0069] More specifically, refer to Figure 10 As shown, the control system 200 also includes a first speed control valve 218, a second speed control valve 219, and a speed control directional valve 220. The first speed control valve 218 is hydraulically connected at one end to the rotary motor 207. The second speed control valve 219 is also hydraulically connected at one end to the rotary motor 207. The speed control directional valve 220 has a third state where it is hydraulically connected to the other end of the first speed control valve 218 and a fourth state where it is hydraulically connected to the other end of the second speed control valve 219. The upper limit of the flow rate regulated by the first speed control valve 218 is lower than the upper limit of the flow rate regulated by the second speed control valve 219. In this embodiment, the speed control directional valve 220 is configured as a two-position three-way manual directional valve.

[0070] More specifically, the two-position three-way manual directional valve has a seventh inlet 220a, a third outlet 220b, and a fourth outlet 220c. The two-position three-way manual directional valve includes a third valve core 220d and a handle 220e. The third outlet 220b is hydraulically connected to a first speed control valve 218. The fourth outlet 220c is hydraulically connected to a second speed control valve 219. When the third valve core 220d is in the fifth position, the seventh inlet 220a and the third outlet 220b are connected; when the third valve core 220d is in the sixth position, the seventh inlet 220a and the fourth outlet 220c are connected.

[0071] Using the above technical solution, when the rock drill 100 is excavating in hard rock formations, it generally requires a high rotational speed and a low advance speed. Reducing the advance speed can effectively reduce drill bit wear. When drilling in soft rock formations with lower hardness, the rock drill 100 can achieve drilling with a large penetration depth at a lower rotational speed and a higher advance speed, which can improve drilling efficiency while ensuring low drill bit wear. In this embodiment, when the rock to be drilled is soft rock, the user control handle 220e sets the third valve core 220d to the fifth position, and the rotational speed of the rotary motor 207 is lower. When the rock to be drilled is hard rock, the user control handle 220e sets the third valve core 220d to the sixth position, and the rotational speed of the rotary motor 207 is higher.

[0072] In this way, the control system 200 in this embodiment not only has a hole-opening mode for hole-opening conditions and a drilling mode for drilling conditions, but also a soft rock mode and a hard rock mode for different rock types, allowing the rock drill 100 to cope with more diverse working conditions. If the first speed control valve 218, the second speed control valve 219 and the speed control reversing valve 220 are lacking, the rock drill 100 needs to increase the speed of the drilling motor when encountering hard rock layers. However, in the existing control system 200, not only does the maximum rotation speed of the rotary motor 207 not meet the drilling requirements of hard rock, but also because the rotation speed of the rotary motor 207 is too high, the corresponding propulsion speed of the propulsion cylinder 202 will also be high, which is not conducive to drilling hard rock layers.

[0073] In this embodiment, the first speed control valve 218, the second speed control valve 219, and the speed control reversing valve 220 solve this problem. When encountering hard rock, the speed control reversing valve 220 can be manually adjusted to connect the second speed control valve 219, allowing the rotary motor 207 to obtain a higher maximum speed. At the same time, the impact control valve 203 is controlled to close the second switch 212, ensuring that the pressure limit of the propulsion control valve 206 is adjusted to 40 bar, resulting in a lower propulsion speed of the propulsion cylinder 202. This allows the rock drill 100 to reach the optimal state for drilling hard rock.

[0074] More specifically, refer to Figure 11As shown, the control system 200 also includes a safety valve assembly 221. The safety valve assembly 221 is hydraulically connected to the rotary motor 207 to depressurize the oil circuit when the pressure in the oil circuit containing the rotary motor 207 exceeds a second preset threshold. In this embodiment, the safety valve assembly 221 includes two relief valves 221a.

[0075] Using the above technical solution, when the rock drill 100 experiences an unexpected situation such as jamming, causing the oil circuit pressure of the rotary motor 207 to rise and the propulsion device to be unable to retract, the oil circuit pressure of the rotary motor 207 will continue to rise. When it reaches the second preset threshold, the overflow valve 221a in the safety valve group 221 will release pressure to protect the rotary motor 207 from damage.

[0076] The control system 200 also includes an impact buffer mechanism 222, which is hydraulically connected to the impact cylinder 201.

[0077] Using the above technical solution, the impact buffer mechanism 222 buffers the vibration generated by the impact cylinder 201.

[0078] It should be noted that the proportional amplifier, not shown in the attached diagram, serves as a signal matching element. Specifically, the proportional amplifier receives the weak control signal sent by the controller 205 and outputs the current required by the proportional flow valve and the proportional pressure valve. Since the proportional amplifier can output any amount of current within the allowable range after receiving the electrical signal transmitted by the controller 205, the flow rate of the impact control valve 203 and the pressure of the propulsion control valve 206 are matched.

[0079] A proportional flow valve is a combination of a proportional electromagnet and a flow valve. It is a manual adjustment device that replaces a throttle valve or speed control valve with a proportional electromagnet. It uses an input electrical signal to change the opening of the throttle valve, thereby regulating the flow of the system.

[0080] A proportional pressure reducing valve is a control valve that uses the change in the energization of an electromagnetic coil to control a proportional electromagnet to achieve the opening of the valve core. When the electromagnetic coil is energized, the electromagnetic force causes the valve core to open, and the hydraulic oil flows through the valve chamber and acts on the surface of the valve core to generate pressure. This pressure is balanced with the spring force and the electromagnetic force, thereby controlling the pressure of the hydraulic oil circuit. Since the electromagnetic force of the proportional electromagnet is related to the current, the pressure of the oil circuit can be adjusted by the magnitude of the current.

[0081] This application has been described in detail above with reference to specific exemplary embodiments. However, it should be understood that various modifications and variations can be made without departing from the scope of this application as defined by the appended claims. The detailed description and drawings should be considered illustrative only and not restrictive, and any such modifications and variations shall fall within the scope of this application described herein. Furthermore, the background art is intended to illustrate the current state of research and development and significance of the technology, and is not intended to limit this application or its application field.

[0082] More specifically, although exemplary embodiments of this application have been described herein, this application is not limited to these embodiments, but includes any and all embodiments modified, omitted, such as combinations between various embodiments, adaptive changes, and / or substitutions, as would be apparent to those skilled in the art from the foregoing detailed description. The limitations in the claims are to be interpreted broadly as used in the language of the claims and are not limited to the examples described in the foregoing detailed description or during the implementation of this application, which should be considered non-exclusive. Any step enumerated in any method or process claim may be performed in any order and is not limited to the order presented in the claims. Therefore, the scope of this application should be determined solely by the appended claims and their legal equivalents, and not by the description and examples given above.

Claims

1. A control system for controlling a drill bit of a rock drill, the control system comprising: The impact cylinder is used to provide power to make the drill bit impact the rock to be excavated; A hydraulic cylinder is used to provide the power to propel the drill bit. Its features are: The control system further includes: An impact control valve is used to control the flow rate in the oil circuit where the impact cylinder is located; A propulsion sensor is used to detect the pressure in the oil circuit where the propulsion cylinder is located; The controller is electrically connected to the propulsion sensor; The impact control valve is hydraulically connected to the impact cylinder; the controller is electrically connected to the impact control valve to obtain the flow rate of the oil circuit where the propulsion cylinder is located, which is adapted to the pressure of the oil circuit where the propulsion cylinder is located, when the pressure of the oil circuit where the propulsion cylinder is located is detected by the propulsion sensor to change. The control system further includes: A hydraulic pump is hydraulically connected to the impact cylinder and the propulsion cylinder; an impact directional valve is hydraulically connected between the impact cylinder and the hydraulic pump; the impact directional valve (214) has a first control port (214a) and a second control port (214b); a second shuttle valve (215) has a third inlet port (215a), a fourth inlet port (215b), and a second outlet port (215c); the first control port (214a) is hydraulically connected to a first switch (211); the second control port (214b) is hydraulically connected to a second switch (212); the first control port (214a) is hydraulically connected to the third inlet port (215a); the second control port (214b) is hydraulically connected to the fourth inlet port (215b); and the second outlet port (215c) is hydraulically connected to the impact cylinder (201). The first switch is electrically connected to the controller; The second switch is electrically connected to the controller; The pressure control valve has a first state of controlling the hydraulic pump to output lower pressure hydraulic oil and a second state of controlling the hydraulic pump to output higher pressure hydraulic oil. The controller is electrically connected to the pressure control valve to control the pressure control valve to switch to the first state when the first switch is closed, or to control the pressure control valve to switch to the second state when the second switch is closed.

2. The control system according to claim 1, characterized in that: The impact control valve is configured as a proportional flow valve.

3. The control system according to claim 1, characterized in that: The control system further includes: The propulsion control valve is used to control the pressure in the oil circuit where the propulsion cylinder is located; A rotary motor is used to provide power to rotate the drill bit; A rotation sensor is used to detect the pressure in the oil circuit where the rotary motor is located; The propulsion control valve is hydraulically connected to the propulsion cylinder; the controller is electrically connected to the rotation sensor; the controller is electrically connected to the propulsion control valve to obtain the pressure of the oil circuit where the propulsion cylinder is located, which is adapted to the pressure of the oil circuit where the rotation sensor detects a change in the pressure of the oil circuit where the rotation motor is located.

4. The control system according to claim 3, characterized in that: The propulsion control valve is configured as a proportional pressure reducing valve.

5. The control system according to claim 4, characterized in that: The control system further includes: The propulsion on / off valve is hydraulically connected to the propulsion cylinder; The controller is electrically connected to the propulsion on / off valve.

6. The control system according to claim 5, characterized in that: The control system further includes: The propulsion reversing valve is hydraulically connected to the propulsion cylinder; The controller is electrically connected to the propulsion reversing valve.

7. The control system according to any one of claims 3 to 6, characterized in that: The control system further includes: The first speed control valve is hydraulically connected to the rotary motor at one end; The second speed control valve is hydraulically connected to the rotary motor at one end; The speed control directional valve has a third state in which it is hydraulically connected to the other end of the first speed control valve and a fourth state in which it is hydraulically connected to the other end of the second speed control valve. The upper limit of the flow rate regulated by the first speed regulating valve is lower than the upper limit of the flow rate regulated by the second speed regulating valve.

8. The control system according to claim 7, characterized in that: The control system further includes: A safety valve assembly is hydraulically connected to the rotary motor to depressurize the oil circuit when the pressure in the oil circuit where the rotary motor is located exceeds a second preset threshold.

9. A rock drill, characterized in that: The rock drill includes a drill bit and a control system as described in any one of claims 1 to 8.

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