Telescopic double-layer propelling beam oil cylinder control hydraulic system

Abstract

The invention discloses a telescopic double-layer propelling beam oil cylinder control hydraulic system which comprises a first reversing valve, a second reversing valve, a third reversing valve, a propelling beam oil cylinder and a rock drill oil cylinder. The first reversing valve is provided with a first working oil port and a second working oil port; the first working oil port is connected with a rodless cavity of the propelling beam oil cylinder through a second oil way; the second working oil port is connected with a rodless cavity of the rock drill oil cylinder through a third oil way and connected with a rod cavity of the propelling beam oil cylinder through a fourth oil way. The second reversing valve is arranged on the third oil way, and the third reversing valve is arranged on the fourth oil way. The rock drill is applied to the field of hydraulic control, the drilling modes can be quickly switched, so that the rock drill adapts to different hole depths, and the technical problems of unstable drilling speed, low drilling efficiency and the like caused by large resistance change of the rock drill in the drilling process are effectively solved.

Description

Technical Field

[0001] This invention relates to the field of hydraulic control technology, specifically a telescopic double-layer propulsion beam hydraulic cylinder control system. Background Technology

[0002] The articulated boom drilling rig is specifically designed for tunnel bench construction, efficiently adapting to the excavation needs of two- and three-bench methods. It also handles key aspects such as full-face drilling, pre-conduit installation, and the installation of anchor bolts and system anchors. This multi-functional equipment aims to maximize the mechanization efficiency of each drilling process, significantly improving overall project progress and achieving versatility. Its core component, the drilling rig's propulsion beam, employs a double-layer structure, consisting of upper and lower telescopic beams. Each layer is driven by an independent hydraulic cylinder, allowing for independent adjustment of the telescopic length according to different drilling depth requirements.

[0003] However, the current drilling mode of the double-layer propulsion beam relies on manual switching, which is not only inconvenient to operate but also lacks flexibility due to the limited length adjustment to only two levels. Furthermore, during the extension and retraction of the existing rock drill cylinders, the significant displacement of the rock drill relative to the propulsion beam support, especially under large angle conditions, leads to fluctuations in propulsion resistance and unstable drill rod stress, thus exacerbating drill rod wear and affecting drilling efficiency. In addition, the back pressure valves added to the rock drill cylinders and propulsion beam cylinders further cause imbalance in the dual-cylinder propulsion force and increase system back pressure, reducing the stability of the drilling process and increasing unnecessary hydraulic power consumption. Summary of the Invention

[0004] To address the shortcomings of the existing technology, this invention provides a telescopic double-layer propulsion beam hydraulic cylinder control system that can quickly switch drilling modes to adapt to different hole depths and effectively solve technical problems such as unstable drilling speed and low drilling efficiency caused by large changes in rock drill resistance during drilling.

[0005] To achieve the above objectives, the present invention provides a telescopic double-layer propulsion beam cylinder control hydraulic system, including a first reversing valve, a second reversing valve, a third reversing valve, a propulsion beam cylinder, and a rock drill cylinder. The first reversing valve has a first working port and a second working port.

[0006] The first working oil port is connected to the rod chamber of the rock drill cylinder through a first oil passage, and the first working oil port is connected to the rodless chamber of the push beam cylinder through a second oil passage; The second working oil port is connected to the rodless chamber of the rock drill cylinder through the third oil circuit, and the second working oil port is connected to the rod chamber of the push beam cylinder through the fourth oil circuit; The second directional valve is located in the third oil line, and the third directional valve is located in the fourth oil line.

[0007] In one embodiment, the hydraulic system has a single-layer working mode, a first double-layer working mode, and a second double-layer working mode; In the single-layer working mode, the second reversing valve controls the third oil circuit to be open and the third reversing valve controls the fourth oil circuit to be closed, that is, only the rock drill cylinder has a telescopic stroke; In the first dual-layer working mode, the second reversing valve controls the third oil circuit to be open, and the third reversing valve controls the fourth oil circuit to be open, that is, the rock drill cylinder and the propulsion beam cylinder have extension and retraction strokes at the same time; The second dual-layer working mode has a first stage and a second stage, and the first stage and the second stage are performed sequentially. Specifically: in the first stage, the second reversing valve controls the third oil circuit to be open and the third reversing valve controls the fourth oil circuit to be closed, that is, only the rock drill cylinder has a telescopic stroke; in the second stage, the second reversing valve controls the third oil circuit to be closed and the third reversing valve controls the fourth oil circuit to be open, that is, only the propulsion beam cylinder has a telescopic stroke.

[0008] In one embodiment, when the drilling depth exceeds a threshold and the absolute value of the angle between the drilling direction of the rock drill and the central axis of the rock drilling rig on the horizontal plane is less than 45°, the hydraulic system adopts the second double-layer working mode. When the drilling depth exceeds the threshold and the absolute value of the angle between the drilling direction of the rock drill and the central axis of the rock drilling rig on the horizontal plane is greater than or equal to 45°, the hydraulic system adopts the first dual-layer working mode.

[0009] In one embodiment, the telescopic double-layer propulsion beam cylinder control hydraulic system also includes a fifth oil circuit, a first stroke valve, and a second stroke valve; The first end of the fifth oil circuit is connected to the second working oil port, the inlet end of the first stroke valve and the inlet end of the second stroke valve are connected in parallel to the second end of the fifth oil circuit, and the outlet end of the first stroke valve and the outlet end of the second stroke valve are connected to the oil tank. The first stroke valve is located on the extension and retraction path of the rock drill cylinder, and the second stroke valve is located on the extension and retraction path of the propulsion beam cylinder.

[0010] In one embodiment, a first pressure sensor is provided at the outlet end of the first stroke valve, and a second pressure sensor is provided at the outlet end of the second stroke valve.

[0011] In one embodiment, the telescopic double-layer propulsion beam cylinder control hydraulic system also includes a sixth oil circuit, a proportional relief valve, a pilot-operated pressure reducing valve, and a check valve; The first end of the sixth oil passage is connected to the second working oil port, and the third oil passage and the fourth oil passage are connected in parallel to the second end of the sixth oil passage; The pilot-operated pressure reducing valve and the check valve are connected in parallel in the sixth oil line, and the proportional relief valve is connected to the pilot pressure control port of the pilot-operated pressure reducing valve.

[0012] In one embodiment, the rodless chamber of the rock drill cylinder is equipped with a third pressure sensor, and the rod chamber of the propulsion beam cylinder is equipped with a fourth pressure sensor.

[0013] In one embodiment, the telescopic double-layer propulsion beam cylinder control hydraulic system further includes a hydraulic lock, wherein one hydraulically controlled check valve of the hydraulic lock is located on the second oil line, and another hydraulically controlled check valve of the hydraulic lock is located on the fourth oil line.

[0014] In one embodiment, the oil inlet of the first directional valve is connected to the oil tank through a seventh oil line, and the oil return port of the first directional valve is connected to the oil tank through an eighth oil line. A hydraulic pump is provided on the seventh oil line.

[0015] In one embodiment, the outlet end of the hydraulic pump is provided with an overflow valve.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: 1. This invention connects the rod chamber of the rock drill cylinder and the rodless chamber of the propulsion beam cylinder in parallel to the first working port of the first directional valve, and connects the rodless chamber of the rock drill cylinder and the rod chamber of the propulsion beam cylinder in parallel to the second working port of the first directional valve. With the control of the oil circuit by the second and third directional valves, the hydraulic system can simultaneously drive the extension and retraction of the propulsion beam cylinder and the rock drill cylinder, or drive the extension and retraction of the rock drill cylinder alone. It can quickly switch drilling modes to adapt to different hole depths. 2. In a preferred embodiment, the present invention can be configured with two different dual-layer working modes, which are selected according to the rotation angle of the propulsion beam: when the rotation angle of the propulsion beam is small, the first dual-layer working mode is adopted, so that the rock drill cylinder and the propulsion beam cylinder can act simultaneously, thereby improving drilling efficiency; when the rotation angle of the propulsion beam is large, the second dual-layer working mode is adopted, so that the rock drill cylinder and the propulsion beam cylinder act sequentially, effectively reducing the influence of friction caused by the increase of bending moment, and ensuring stable force throughout the drilling process; 3. In the preferred embodiment of the present invention, a proportional relief valve, a pilot-operated pressure reducing valve, and a check valve are provided. By remotely setting the pressure value of the pilot-operated pressure reducing valve, the high-pressure oil at the second working port of the first directional valve is offset, thereby stabilizing the pressure in the rodless chamber of the rock drill cylinder and / or the rod chamber of the propulsion beam cylinder. This stabilizes the drilling speed and efficiency, effectively solving the technical problems of unstable drilling speed and low drilling efficiency caused by large changes in the resistance of the rock drill during the drilling process. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the hydraulic system structure in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the working area of ​​the propulsion beam in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the hydraulic system structure in Embodiment 2 of the present invention.

[0019] Reference numerals: 1. Hydraulic pump; 2. First directional valve; 3. Second directional valve; 4. Third directional valve; 5. Propeller beam cylinder; 6. Rock drill cylinder; 7. First oil circuit; 8. Second oil circuit; 9. Third oil circuit; 10. Fourth oil circuit; 11. Seventh oil circuit; 12. Oil tank; 13. Eighth oil circuit; 14. Relief valve; 15. Hydraulic lock; 16. Fifth oil circuit; 17. First stroke valve; 18. Second stroke valve; 19. First pressure sensor; 20. Second pressure sensor; 21. Sixth oil circuit; 22. Proportional relief valve; 23. Pilot-operated pressure reducing valve; 24. Check valve; 25. Third pressure sensor; 26. Fourth pressure sensor; 27. Rock drill; 28. First layer propulsion beam; 29. ​​Second layer propulsion beam.

[0020] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0023] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0026] Example 1 This embodiment discloses a telescopic double-layer propulsion beam cylinder control hydraulic system (hereinafter referred to as "hydraulic system"), which is used to control the telescopic movement of the propulsion beam cylinder 5 and the rock drill cylinder 6 on the double-layer propulsion beam.

[0027] In this embodiment, the cylinder body of the propulsion beam cylinder 5 is fixedly mounted on the first-layer propulsion beam 28. The piston rod of the propulsion beam cylinder 5 is connected to the second-layer propulsion beam 29. That is, the extension action of the piston rod of the propulsion beam cylinder 5 drives the second-layer propulsion beam 29 to move backward, and the retraction action of the piston rod of the propulsion beam cylinder 5 drives the second-layer propulsion beam 29 to move forward. The piston rod of the rock drill cylinder 6 is fixedly connected to the second-layer propulsion beam 29. The cylinder body of the rock drill cylinder 6 is connected to the rock drill 27 through a pull rope and a movable pulley. The piston rod of the rock drill cylinder 6 faces the same direction as the piston rod of the propulsion beam cylinder 5. That is, the retraction action of the piston rod of the rock drill cylinder 6 drives the rock drill 27 to move backward, and the extension action of the piston rod of the rock drill cylinder 6 drives the rock drill 27 to move forward.

[0028] refer to Figure 1The hydraulic system mainly includes a hydraulic pump 1, a first directional valve 2, a second directional valve 3, a third directional valve 4, a propulsion beam cylinder 5, and a rock drill cylinder 6. The first directional valve 2 has an inlet P, a return port T, a first working port A, and a second working port B. The first working port A is connected to the rod chamber of the rock drill cylinder 6 via a first oil passage 7, and to the rodless chamber of the propulsion beam cylinder 5 via a second oil passage 8. The second working port B is connected to the rodless chamber of the rock drill cylinder 6 via a third oil passage 9, and to the rod chamber of the propulsion beam cylinder 5 via a fourth oil passage 10. The inlet P is connected to the oil tank 12 via a seventh oil passage 11, and the return port T is connected to the oil tank 12 via an eighth oil passage 13. The hydraulic pump 1 is located on the seventh oil passage 11, and the outlet end of the hydraulic pump 1 is equipped with an overflow valve 14 to limit the maximum system pressure. The second directional valve 3 is a two-position, two-way directional valve installed on the third oil circuit 9, used to control the opening and closing of the third oil circuit 9; the third directional valve 4 is a two-position, two-way directional valve installed on the fourth oil circuit 10, used to control the opening and closing of the fourth oil circuit 10.

[0029] The hydraulic system in this embodiment has a single-layer working mode, a first double-layer working mode, and a second double-layer working mode. The single-layer working mode is suitable for scenarios with shallow drilling depths. In this mode, the propulsion beam cylinder 5 remains stationary, and the drilling action of the rock drill 27 is driven solely by the rock drill cylinder 6. The first double-layer working mode is suitable for scenarios with deeper drilling depths and smaller rotation angles (smaller bending moments) of the propulsion beam. In this mode, the rock drill cylinder 6 and the propulsion beam cylinder 5 can operate simultaneously, thereby improving drilling efficiency. The second double-layer working mode is suitable for scenarios with deeper drilling depths and larger rotation angles (larger bending moments) of the propulsion beam. In this mode, the upper rock drill cylinder 6 extends and retracts first, followed by the lower propulsion beam cylinder 5, effectively reducing the impact of friction caused by increased bending moment and ensuring stable force distribution throughout the drilling process.

[0030] In single-layer working mode, the second directional valve 3 remains de-energized, while the third directional valve 4 is energized, disconnecting its front and rear oil circuits. This means the third oil circuit 9 is open and the fourth oil circuit 10 is closed. At this time, the propulsion beam cylinder 5 cannot form a complete hydraulic circuit; only the rock drill cylinder 6 has a telescopic stroke. In practical applications, the propulsion beam cylinder 5 can be extended or retracted to its longest, shortest, or any position according to the actual site conditions. Then, the third directional valve 4 is energized to disconnect the fourth oil circuit 10. At this time, the first working port A on the first directional valve 2 connects to the rod chamber of the rock drill cylinder 6, and the second working port B connects to the rodless chamber of the rock drill cylinder 6. This means the hydraulic system independently drives the extension and retraction of the rock drill cylinder 6, enabling the rock drill 27 to operate in short drilling mode (or arbitrary length drilling mode).

[0031] In this embodiment, the first dual-layer working mode of the hydraulic system is specifically applicable when the drilling depth exceeds a threshold and the absolute value of the angle between the drilling direction of the rock drill 27 and the central axis of the rock drilling rig on the horizontal plane is less than 45° (i.e., for...). Figure 2 The working scenario during operation in Zone 1 and Zone 2. In the first dual-layer working mode, the second reversing valve 3 and the third reversing valve 4 are simultaneously de-energized, making the third oil circuit 9 and the fourth oil circuit 10 open, meaning that the rock drill cylinder 6 and the propulsion beam cylinder 5 simultaneously have extension and retraction strokes. In the first dual-layer working mode, if the left-position solenoid valve of the first reversing valve 2 is energized, the first working oil port A on the first reversing valve 2 is connected to the oil inlet port P, and the second working oil port B is connected to the oil return port T; hydraulic oil enters the rod chamber of the rock drill cylinder 6 and the rodless chamber of the propulsion beam cylinder 5 through the first working oil port A of the first reversing valve 2, causing the piston rod of the rock drill cylinder 6 to retract and the piston rod of the propulsion beam cylinder 5 to extend, thereby causing the rock drill cylinder 6 and the propulsion beam cylinder 5 to simultaneously drive the rock drill 27 to retract backward. In the first dual-layer working mode, if the right-position solenoid valve of the first reversing valve 2 is energized, the second working port B on the first reversing valve 2 is connected to the inlet port P, and the first working port A is connected to the return port T. Hydraulic oil enters the rodless chamber of the rock drill cylinder 6 and the rod chamber of the propulsion beam cylinder 5 through the second working port B of the first reversing valve 2, causing the piston rod of the rock drill cylinder 6 to extend and the piston rod of the propulsion beam cylinder 5 to retract, so that the rock drill cylinder 6 and the propulsion beam cylinder 5 simultaneously drive the rock drill 27 forward.

[0032] In this embodiment, the second double-layer working mode of the hydraulic system is specifically applicable when the drilling depth exceeds a threshold, and the absolute value of the angle between the drilling direction of the rock drill 27 and the central axis of the rock drilling rig on the horizontal plane is greater than or equal to 45° (i.e., for...). Figure 2 The working scenario during operations in Zones 3 and 4 (in the middle zone). The second dual-layer working mode has a first stage and a second stage, which are performed sequentially. Specifically: In the first stage, the second directional valve 3 remains de-energized, and the third directional valve 4 is energized, disconnecting its front and rear oil circuits (i.e., the third oil circuit 9 is open and the fourth oil circuit 10 is closed). At this time, the propulsion beam cylinder 5 cannot form a complete hydraulic circuit, and only the rock drill cylinder 6 has a telescopic stroke. In the second stage, the third directional valve 4 remains de-energized, and the second directional valve 3 is energized, disconnecting its front and rear oil circuits (i.e., the third oil circuit 9 is closed and the fourth oil circuit 10 is open). At this time, the rock drill cylinder 6 cannot form a complete hydraulic circuit, and only the propulsion beam cylinder 5 has a telescopic stroke. This ensures that the upper rock drill cylinder 6 telescopics first, followed by the lower propulsion beam cylinder 5, effectively reducing the impact of friction caused by increased bending moment and ensuring stable force distribution throughout the drilling process.

[0033] In a preferred embodiment, the hydraulic system further includes a hydraulic lock 15. One hydraulically controlled check valve in the hydraulic lock 15 is located on the second oil circuit 8, and the other hydraulically controlled check valve in the hydraulic lock 15 is located on the fourth oil circuit 10. Specifically, the first oil inlet of the hydraulic lock 15 is located on the second oil circuit 8 and connected to the first working oil port A, and the first oil outlet of the hydraulic lock 15 is located on the second oil circuit 8 and connected to the rodless chamber of the rock drill cylinder 6; the second oil inlet of the hydraulic lock 15 is located on the fourth oil circuit 10 and connected to the second working oil port B, and the second oil outlet of the hydraulic lock 15 is located on the fourth oil circuit 10 and connected to the rod chamber of the rock drill cylinder 6.

[0034] In a preferred embodiment, the hydraulic system further includes a fifth oil passage 16, a first stroke valve 17, and a second stroke valve 18. The first end of the fifth oil passage 16 is connected to the second working port B. The inlet ends of the first stroke valve 17 and the second stroke valve 18 are connected in parallel to the second end of the fifth oil passage 16. The outlet ends of the first stroke valve 17 and the second stroke valve 18 are connected to the oil tank 12. The first stroke valve 17 is located on the extension / retraction path of the rock drill cylinder 6, and is triggered when the rock drill cylinder 6 drives the rock drill 27 to its maximum position along the drilling direction, to prevent pressure buildup in the rock drill cylinder 6. The second stroke valve 18 is located on the extension / retraction path of the propulsion beam cylinder 5, and is triggered when the propulsion beam cylinder 5 drives the second layer propulsion beam 29 to its maximum position along the drilling direction, to prevent pressure buildup in the propulsion beam cylinder 5.

[0035] More preferably, the outlet end of the first stroke valve 17 is provided with a first pressure sensor 19 to detect pressure fluctuations in the first stroke valve 17, determine whether the first stroke valve 17 has been triggered, and promptly control the third oil circuit 9 to disconnect via the second directional valve 3. The outlet end of the second stroke valve 18 is provided with a second pressure sensor 20 to detect pressure fluctuations in the second stroke valve 18, determine whether the second stroke valve 18 has been triggered, and promptly control the fourth oil circuit 10 to disconnect via the third directional valve 4. In addition, the first pressure sensor 19 and the second pressure sensor 20 can also serve as stage switching criteria in the second dual-layer working mode. Specifically: First, the second directional valve 3 is de-energized, the third directional valve 4 is energized, and the right-position solenoid valve of the first directional valve 2 is energized. At this time, hydraulic oil enters the rodless chamber of the rock drill cylinder 6 through the second working port B of the first directional valve 2, causing the piston rod of the rock drill cylinder 6 to extend and drive the rock drill 27 forward. When the first stroke valve 17 is triggered, the second directional valve 3 is energized, the third directional valve 4 is de-energized, and the right-position solenoid valve of the first directional valve 2 is energized. At this time, hydraulic oil enters the rodless chamber of the rock drill cylinder 6 through the second working port B of the first directional valve 2, causing the piston rod of the rock drill cylinder 6 to extend and drive the rock drill 27 forward. The second working port B enters the rod chamber of the propulsion beam cylinder 5, causing the piston rod of the propulsion beam cylinder 5 to retract and drive the rock drill 27 to continue forward. When the second stroke valve 18 is triggered, the second reversing valve 3 is de-energized, the third reversing valve 4 is de-energized, and the left-position solenoid valve of the first reversing valve 2 is energized. At this time, the hydraulic oil enters the rod chamber of the rock drill cylinder 6 and the rodless chamber of the propulsion beam cylinder 5 through the first working port A of the first reversing valve 2, causing the piston rod of the rock drill cylinder 6 to retract and the piston rod of the propulsion beam cylinder 5 to extend. This causes the rock drill cylinder 6 and the propulsion beam cylinder 5 to simultaneously drive the rock drill 27 to retreat, ending the drilling operation.

[0036] Example 2 This embodiment discloses a hydraulic control system for a telescopic double-layer propulsion beam cylinder 5, the implementation of which is basically the same as that of Embodiment 1, with the only difference being: The hydraulic system in this embodiment also includes a sixth oil passage 21, a proportional relief valve 22, a pilot-operated pressure reducing valve 23, and a check valve 24. (See reference) Figure 3The first end of the sixth oil circuit 21 is connected to the second working port. The third oil circuit 9 and the fourth oil circuit 10 are connected in parallel to the second end of the sixth oil circuit 21. The pilot-operated pressure reducing valve 23 and the check valve 24 are connected in parallel to the sixth oil circuit 21. The high-pressure oil inlet of the pilot-operated pressure reducing valve 23 and the outlet of the check valve 24 are connected to the second working port B. The outlet of the pilot-operated pressure reducing valve 23 and the inlet of the check valve 24 are connected to the third oil circuit 9 and the fourth oil circuit 10. The proportional relief valve 22 is connected to the pilot pressure control port of the pilot-operated pressure reducing valve 23 and is used to remotely set the pressure value of the pilot-operated pressure reducing valve 23. The pressure value of the pilot pressure reducing valve 23 is remotely set by the proportional relief valve 22, thereby offsetting the high pressure oil at the second working port B on the first directional valve 2, so that the pressure in the rodless chamber of the rock drill cylinder 6 and / or the rod chamber of the propulsion beam cylinder 5 is stabilized, thereby stabilizing the drilling speed and efficiency, and effectively solving the technical problems such as unstable drilling speed and low drilling efficiency caused by large changes in the resistance of the rock drill 27 during the drilling process. Preferably, a third pressure sensor 25 is provided on the rodless chamber of the rock drill cylinder 6, and a fourth pressure sensor 26 is provided on the rod chamber of the propulsion beam cylinder 5. These sensors are used to collect the pressure values ​​of the rodless chamber of the propulsion beam cylinder 5 and / or the rod chamber of the rock drill cylinder 6. This allows the current value of the electro-proportional relief valve 22 to be dynamically adjusted based on the pressure values ​​collected by the third pressure sensor 25 and / or the fourth pressure sensor 26 during the drilling process of the rock drill 27. Consequently, the pressure in the rodless chamber of the rock drill cylinder 6 and / or the rod chamber of the propulsion beam cylinder 5 is limited by the pilot-operated pressure reducing valve 23, thereby limiting the drilling thrust and preventing excessive stress on the drill rod, which could cause damage.

[0037] In this embodiment, the pilot-operated pressure reducing valve 23 can also ensure stable drilling force throughout the drilling process when switching between the first and second stages in the second dual-layer working mode. The specific operation process of the second dual-layer working mode is as follows: First, the first stage is carried out, keeping the second reversing valve 3 de-energized, the third reversing valve 4 energized, and the right-position solenoid valve of the first reversing valve 2 energized. At this time, the hydraulic oil enters the rodless chamber of the rock drill cylinder 6 through the second working oil port B of the first reversing valve 2, causing the piston rod of the rock drill cylinder 6 to extend and drive the rock drill 27 forward. When the first pressure sensor 19 detects that the first stroke valve 17 has been triggered, it controls the second directional valve 3 to be energized and the third directional valve 4 to be de-energized, while keeping the right-hand solenoid valve of the first directional valve 2 energized, thus switching from the first stage to the second stage. At this time, hydraulic oil enters the rod chamber of the propulsion beam cylinder 5 through the second working port B of the first directional valve 2, causing the piston rod of the propulsion beam cylinder 5 to retract and drive the rock drill 27 to continue moving forward. When switching from the first stage to the second stage, the pressure in the rod chamber of the propulsion beam cylinder 5 is detected by the fourth pressure sensor 26, and the pressure is adjusted by changing the electro-proportional relief valve. The current value of 22 adjusts the pressure value of the pilot-operated pressure reducing valve 23, so that the thrust value of the rod chamber of the propulsion beam cylinder 5 is equal to the thrust of the rodless chamber of the rock drill cylinder 6 in the first stage. This keeps the drilling force of the drill rod of the rock drill 27 approximately the same as when the rock drill cylinder 6 is extended in the first stage, thus ensuring that the drilling force is stable throughout the drilling process. The thrust value is calculated as follows: rock drill thrust = pressure value detected by the third pressure sensor × area of ​​the rodless chamber of the rock drill cylinder, rock drill propulsion beam / area of ​​the rodless chamber of the propulsion beam cylinder = pressure of the pilot-operated pressure reducing valve = pressure value detected by the fourth pressure sensor. When the second pressure sensor 20 detects that the second stroke valve 18 has been triggered, it controls the second reversing valve 3 to de-energize, the third reversing valve 4 to de-energize, and the left-position solenoid valve of the first reversing valve 2 to be energized. At this time, hydraulic oil enters the rod chamber of the rock drill cylinder 6 and the rodless chamber of the push beam cylinder 5 through the first working oil port A of the first reversing valve 2, causing the piston rod of the rock drill cylinder 6 to retract and the piston rod of the push beam cylinder 5 to extend. This causes the rock drill cylinder 6 and the push beam cylinder 5 to simultaneously drive the rock drill 27 to retract backward, thus ending the drilling operation.

[0038] The above description is only a preferred embodiment of the present invention and does not limit the scope of protection of the present invention. All equivalent structural transformations made under the inventive concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present invention.

Claims

1. A telescopic double-layer propulsion beam cylinder control hydraulic system, characterized in that, It includes a first reversing valve, a second reversing valve, a third reversing valve, a propulsion beam cylinder, and a rock drill cylinder. The first reversing valve has a first working port and a second working port. The first working oil port is connected to the rod chamber of the rock drill cylinder through a first oil passage, and the first working oil port is connected to the rodless chamber of the push beam cylinder through a second oil passage; The second working oil port is connected to the rodless chamber of the rock drill cylinder through the third oil circuit, and the second working oil port is connected to the rod chamber of the push beam cylinder through the fourth oil circuit; The second directional valve is located in the third oil line, and the third directional valve is located in the fourth oil line.

2. The telescopic double-layer propulsion beam hydraulic cylinder control system according to claim 1, characterized in that, The hydraulic system has a single-layer working mode, a first double-layer working mode and a second double-layer working mode; In the single-layer working mode, the second reversing valve controls the third oil circuit to be open and the third reversing valve controls the fourth oil circuit to be closed, that is, only the rock drill cylinder has a telescopic stroke; In the first dual-layer working mode, the second reversing valve controls the third oil circuit to be open, and the third reversing valve controls the fourth oil circuit to be open, that is, the rock drill cylinder and the propulsion beam cylinder have extension and retraction strokes at the same time; The second dual-layer working mode has a first stage and a second stage, and the first stage and the second stage are performed sequentially. Specifically: in the first stage, the second reversing valve controls the third oil circuit to be open and the third reversing valve controls the fourth oil circuit to be closed, that is, only the rock drill cylinder has a telescopic stroke; in the second stage, the second reversing valve controls the third oil circuit to be closed and the third reversing valve controls the fourth oil circuit to be open, that is, only the propulsion beam cylinder has a telescopic stroke.

3. The telescopic double-layer propulsion beam hydraulic cylinder control system according to claim 2, characterized in that, When the drilling depth exceeds the threshold and the absolute value of the angle between the drilling direction of the rock drill and the central axis of the rock drilling rig on the horizontal plane is less than 45°, the hydraulic system adopts the first dual-layer working mode. When the drilling depth exceeds the threshold and the absolute value of the angle between the drilling direction of the rock drill and the central axis of the rock drilling rig on the horizontal plane is greater than or equal to 45°, the hydraulic system adopts the second double-layer working mode.

4. The telescopic double-layer propulsion beam hydraulic cylinder control system according to claim 1, 2, or 3, characterized in that, It also includes the fifth oil circuit, the first stroke valve, and the second stroke valve; The first end of the fifth oil circuit is connected to the second working oil port, the inlet end of the first stroke valve and the inlet end of the second stroke valve are connected in parallel to the second end of the fifth oil circuit, and the outlet end of the first stroke valve and the outlet end of the second stroke valve are connected to the oil tank. The first stroke valve is located on the extension and retraction path of the rock drill cylinder, and the second stroke valve is located on the extension and retraction path of the propulsion beam cylinder.

5. The telescopic double-layer propulsion beam cylinder control hydraulic system according to claim 4, characterized in that, The first stroke valve is equipped with a first pressure sensor at its outlet end, and the second stroke valve is equipped with a second pressure sensor at its outlet end.

6. The telescopic double-layer propulsion beam cylinder control hydraulic system according to claim 1, 2, or 3, characterized in that, It also includes a sixth oil circuit, a proportional relief valve, a pilot-operated pressure reducing valve, and a check valve; The first end of the sixth oil passage is connected to the second working oil port, and the third oil passage and the fourth oil passage are connected in parallel to the second end of the sixth oil passage; The pilot-operated pressure reducing valve and the check valve are connected in parallel in the sixth oil line, and the proportional relief valve is connected to the pilot pressure control port of the pilot-operated pressure reducing valve.

7. The telescopic double-layer propulsion beam cylinder control hydraulic system according to claim 6, characterized in that, The rodless chamber of the rock drill cylinder is equipped with a third pressure sensor, and the rod chamber of the propulsion beam cylinder is equipped with a fourth pressure sensor.

8. The telescopic double-layer propulsion beam cylinder control hydraulic system according to claim 1, 2, or 3, characterized in that, It also includes a hydraulic lock, in which one hydraulically controlled check valve is located on the second oil line, and another hydraulically controlled check valve is located on the fourth oil line.

9. The telescopic double-layer propulsion beam cylinder control hydraulic system according to claim 1, 2, or 3, characterized in that, The oil inlet of the first directional valve is connected to the oil tank through the seventh oil circuit, and the oil return port of the first directional valve is connected to the oil tank through the eighth oil circuit. A hydraulic pump is provided on the seventh oil circuit.

10. The telescopic double-layer propulsion beam cylinder control hydraulic system according to claim 9, characterized in that, The hydraulic pump is equipped with an overflow valve at its outlet.

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