Hydraulic system combining load sensing control and constant pressure control, arch anchor operation trolley

Abstract

The application discloses a hydraulic system combined with load-sensitive control and constant-pressure control, and an arch anchor operation trolley, and the switchable feedback oil circuit between a first main pump and a plurality of operation control modules is constructed through one electric proportional overflow valve, three two-position four-way electromagnetic valves and a plurality of shuttle valves, and only the on-off states of the electric proportional overflow valve and the three two-position four-way electromagnetic valves need to be controlled, so that the first main pump can be switched between the load-sensitive control mode and the constant-pressure control mode. When the first main pump works in the constant-pressure control mode, stable pressure and flow output can be provided for the arch rod operation, and the left and right arms can simultaneously perform arch installation operation; when the first main pump works in the load-sensitive mode, the pressure and flow of the first main pump can be automatically adjusted according to the load pressure, so that the energy consumption is the lowest when the arm frame moves and the arch operation is performed; and therefore, different control requirements of three operation modes, i.e. the arch rod operation, the arch operation and the arch rod and arch operation simultaneously, can be met.

Description

Technical Field

[0001] This invention relates to the field of arch anchor operation trolley technology, and in particular to a hydraulic system combining load-sensitive control and constant pressure control. Furthermore, it also relates to an arch anchor operation trolley employing the aforementioned hydraulic system. Background Technology

[0002] Currently, the hydraulic system control mode of the arch-anchoring trolley is singular, employing only a closed-center load-sensitive control mode. This means that during anchor bolting, to ensure the flow supply to the rock drill, both booms must remain stationary, preventing simultaneous anchor bolting and arch erection operations, which significantly reduces drilling efficiency. Furthermore, the unstable pressure and flow output required for anchor bolting under load-sensitive control mode also affects drilling efficiency. Summary of the Invention

[0003] This invention provides a hydraulic system and an arch anchoring trolley that combine load-sensitive control and constant pressure control, in order to solve the technical problem that the hydraulic system of existing arch anchoring trolleys cannot perform anchor bolting and arch erecting operations simultaneously because it only adopts a single load-sensitive control mode.

[0004] According to one aspect of the present invention, a hydraulic system combining load-sensitive control and constant pressure control is provided, comprising a first main pump, a first check valve, an electro-proportional relief valve, a first two-position four-way solenoid valve, a second two-position four-way solenoid valve, a third two-position four-way solenoid valve, a first shuttle valve, a second shuttle valve, a third shuttle valve, a fourth shuttle valve, a fifth shuttle valve, an anchor drilling control module, a middle arch anchor boom control module, a left arch boom control module, a right arch boom control module, a switching valve group, a first multi-way valve, and a second multi-way valve. The first main pump is connected to a hydraulic oil tank, the first check valve, the electro-proportional relief valve, and the first two-position four-way solenoid valve, respectively. The electro-proportional relief valve and the first two-position four-way solenoid valve are both connected to the hydraulic oil tank. The first two-position four-way solenoid valve is also connected to the first shuttle valve. The first check valve is connected to the anchor drilling control module, the middle arch anchor boom control module, the left arch boom control module, and the right arch boom control module, respectively. The switching valve group's working port is connected. The first multi-way valve is connected to the switching valve group and the second multi-way valve. The second two-position four-way solenoid valve is connected to the feedback port of the anchor bolt drilling control module and the first shuttle valve. The fourth shuttle valve is connected to the feedback ports of the left arch boom control module and the right arch boom control module. The fifth shuttle valve is also connected to the feedback port of the switching valve group and the fourth shuttle valve. The fifth shuttle valve and the feedback port of the middle arch anchor boom control module are both connected to the third shuttle valve. The third two-position four-way solenoid valve is connected to the third shuttle valve and the second shuttle valve. The first shuttle valve is connected to the second shuttle valve. The second shuttle valve is connected to the feedback port of the first main pump. By controlling the gain and loss of power of the electro-proportional relief valve, the first two-position four-way solenoid valve, the second two-position four-way solenoid valve, and the third two-position four-way solenoid valve, the first main pump can switch between load-sensitive control mode and constant pressure control mode.

[0005] Furthermore, when the electro-proportional overflow valve, the first two-position four-way solenoid valve, the second two-position four-way solenoid valve, and the third two-position four-way solenoid valve are all energized, the pressure of the anchor bolt drilling control module, the intermediate arch anchor boom control module, the left arch boom control module, the right arch boom control module, and the switching valve group cannot be fed back to the first main pump. The pressure at the outlet of the first main pump is fed back to the feedback port of the first main pump only through the first two-position four-way solenoid valve, and the first main pump switches to constant pressure control mode.

[0006] When the electro-proportional relief valve, the first two-position four-way solenoid valve, and the third two-position four-way solenoid valve are all de-energized, the feedback pressure of the intermediate arch boom control module, the left arch boom control module, the right arch boom control module, and the switching valve group is compared by the second shuttle valve, the third shuttle valve, the fourth shuttle valve, and the fifth shuttle valve, and the maximum feedback pressure is taken. The maximum feedback pressure is then fed back to the feedback port of the first main pump, and the first main pump switches to the load-sensitive control mode.

[0007] Furthermore, it also includes a second main pump, a second check valve, and a sixth shuttle valve. The second main pump is connected to the hydraulic oil tank and the second check valve, respectively. The second check valve is connected to the working oil port of the anchor drilling control module, the intermediate arch anchor boom control module, the left arch boom control module, the right arch boom control module, and the switching valve group, respectively. The sixth shuttle valve is connected to the third two-position four-way solenoid valve, the second two-position four-way solenoid valve, and the feedback port of the second main pump, respectively, so that the second main pump and the first main pump serve as backups for each other in the load-sensitive control mode.

[0008] Furthermore, when the first main pump is working, if the electro-proportional relief valve, the first two-position four-way solenoid valve, and the third two-position four-way solenoid valve are all de-energized, the feedback pressure of the intermediate arch boom control module, the left arch boom control module, the right arch boom control module, and the switching valve group is compared by the second shuttle valve, the third shuttle valve, the fourth shuttle valve, and the fifth shuttle valve to take the maximum feedback pressure, and the maximum feedback pressure is fed back to the feedback port of the first main pump, and the first main pump switches to the load-sensitive control mode;

[0009] When the second main pump is working, if the third two-position four-way solenoid valve is energized, the feedback pressure of the intermediate arch boom control module, the left arch boom control module, the right arch boom control module and the switching valve group is compared by the third shuttle valve, the fourth shuttle valve, the fifth shuttle valve and the sixth shuttle valve to take the maximum feedback pressure, and the maximum feedback pressure is fed back to the feedback port of the second main pump, and the second main pump switches to the load-sensitive control mode.

[0010] Furthermore, the first main pump is driven by a first motor, and the second main pump is driven by an engine.

[0011] Furthermore, it also includes a first gear pump, which is connected to the hydraulic oil tank and the anchor drilling control module.

[0012] Furthermore, it also includes a second gear pump and an air cooler. The second gear pump is connected to the hydraulic oil tank and the motor of the air cooler, respectively. The air cooler is also connected to the return oil port of the anchor drilling control module, the intermediate arch anchor boom control module, the left arch boom control module, the right arch boom control module, the first multi-way valve and the second multi-way valve, for air cooling of the return oil.

[0013] Furthermore, it also includes a third gear pump and a filling valve. The third gear pump is connected to the hydraulic oil tank and the filling valve respectively. The filling valve is also connected to the motors of the parking brake, steering gear, brake valve, accumulator group and air cooler respectively, so that the third gear pump and the second gear pump can serve as backups for each other when air cooling is used.

[0014] Furthermore, it also includes a water cooler, which is connected to another oil return port of the anchor drilling control module for water cooling of the rock drill oil return.

[0015] In addition, the present invention also provides an arch anchor operation trolley, which adopts a hydraulic system combining load-sensitive control and constant pressure control as described above.

[0016] The present invention has the following effects:

[0017] The hydraulic system of this invention, combining load-sensitive control and constant pressure control, constructs a switchable feedback oil circuit between the first main pump and multiple operation control modules through an electro-proportional relief valve, three two-position four-way solenoid valves, and multiple shuttle valves. Switching of the feedback oil circuit is achieved simply by controlling the on / off state of the electro-proportional relief valve and the three two-position four-way solenoid valves, allowing the first main pump to switch between load-sensitive control mode and constant pressure control mode. When the first main pump operates in constant pressure control mode, it provides a stable pressure and flow output for anchor bolt operations, and the left and right booms can simultaneously perform arch installation operations. When the first main pump operates in load-sensitive mode, it automatically adjusts the pressure and flow of the first main pump according to the load pressure, ensuring minimal energy consumption during boom movement and arch erection operations. This satisfies the different control requirements of three operating modes: anchor bolt operation alone, arch erection operation alone, and simultaneous anchor bolt and arch erection operations.

[0018] In addition, the arch anchor operation trolley of the present invention also has the above-mentioned advantages.

[0019] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0021] Figure 1 This is a schematic diagram of the hydraulic principle of a hydraulic system combining load-sensitive control and constant pressure control according to a preferred embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the hydraulic principle of the switching valve group according to a preferred embodiment of the present invention.

[0023] Explanation of reference numerals in the attached figures

[0024] 1. First main pump; 2. First check valve; 3. Electro-proportional relief valve; 4. First two-position four-way solenoid valve; 5. Second two-position four-way solenoid valve; 6. First shuttle valve; 7. Second shuttle valve; 8. Third shuttle valve; 9. Fourth shuttle valve; 10. Fifth shuttle valve; 11. Anchor bolt drilling control module; 12. Intermediate arch anchor boom control module; 13. Left arch boom control module; 14. Right arch boom control module; 15. Switching valve group; 16. First multi-way valve; 17. Second multi-way valve; 18. Third two-position four-way solenoid valve; 19. Second main pump; 20. Second check valve; 21. Sixth shuttle valve; 22. First motor; 23. Engine; 24. First gear pump; 25. Second gear pump; 26. Air cooler; 27. Third gear pump; 28. Filling valve; 29. ​​Parking brake; 30. Steering gear; 31. Brake valve; 32. Accumulator group; 33. Service brake; 34. First steering cylinder; 35. Second steering cylinder; 36. Water cooler; 37. First filter; 38. Second filter; 39. First relief valve; 40. Second relief valve; 41. Cable reel motor; 42. First outrigger cylinder; 43. Second outrigger cylinder; 44. Third outrigger cylinder; 45. Fourth outrigger cylinder; 46. Fifth outrigger cylinder; 47. Sixth outrigger cylinder; 48. Second motor; 100. Hydraulic oil tank; 151. Solenoid directional valve; 152. Damping component. Detailed Implementation

[0025] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0026] Understandable, such as Figure 1As shown, a preferred embodiment of the present invention provides a hydraulic system combining load-sensitive control and constant pressure control, comprising a first main pump 1, a first check valve 2, an electro-proportional relief valve 3, a first two-position four-way solenoid valve 4, a second two-position four-way solenoid valve 5, a third two-position four-way solenoid valve 18, a first shuttle valve 6, a second shuttle valve 7, a third shuttle valve 8, a fourth shuttle valve 9, a fifth shuttle valve 10, an anchor drilling control module 11, a middle arch anchor boom control module 12, a left arch boom control module 13, a right arch boom control module 14, a switching valve group 15, a first multi-way valve 16, and a second multi-way valve 17. The first main pump 1 is connected to a hydraulic oil tank 100, the first check valve 2, the electro-proportional relief valve 3, and the first two-position four-way solenoid valve 4. The electro-proportional relief valve 3 and the first two-position four-way solenoid valve 4 are both connected to the hydraulic oil tank 100, and the first two-position four-way solenoid valve 4 is also connected to the first shuttle valve 6. When the first two-position four-way solenoid valve 4 is energized, it can feed back the outlet pressure of the first main pump 1 to the first shuttle valve 6. The first check valve 2 is connected to the working oil port P2 of the anchor drilling control module 11, the working oil port P4 of the intermediate arch anchor boom control module 12, the working oil port P5 of the left arch boom control module 13, the working oil port P6 of the right arch boom control module 14, and the working oil port P7 of the switching valve group 15. It can be understood that the first main pump 1 is preferably a variable displacement piston pump. The first main pump 1 draws hydraulic oil from the hydraulic oil tank 100, pressurizes it, and then delivers it to the anchor drilling control module 11, the intermediate arch anchor boom control module 12, the left arch boom control module 13, the right arch boom control module 14, and the switching valve group 15 through the first check valve 2 to provide them with working pressure oil. The first multi-way valve 16 is connected to the switching valve group 15 and the second multi-way valve 17, that is, the first multi-way valve 16, the second multi-way valve 17 and the switching valve group 15 are connected in series. The second two-position four-way solenoid valve 5 is connected to the feedback port LS1 of the anchor bolt drilling control module 11 and the first shuttle valve 6, respectively. When the second two-position four-way solenoid valve 5 is de-energized, the pressure of the feedback port LS1 of the anchor bolt drilling control module 11 can be fed back to the first shuttle valve 6. The fourth shuttle valve 9 is connected to the feedback port LS3 of the left arch boom control module 13 and the feedback port LS4 of the right arch boom control module 14, respectively. The fourth shuttle valve 9 takes the larger feedback pressure between LS3 and LS4. The fifth shuttle valve 10 is also connected to the feedback port LS5 of the switching valve group 15 and the fourth shuttle valve 9, respectively. The fifth shuttle valve 10 takes the larger feedback pressure between the fourth shuttle valve 9 and the feedback port LS5 of the switching valve group 15. The fifth shuttle valve 10 and the feedback port LS2 of the intermediate arch anchor boom control module 12 are both connected to the third shuttle valve 8, and the third shuttle valve 8 takes the larger feedback pressure between the two. The third two-position four-way solenoid valve 18 is connected to the third shuttle valve 8 and the second shuttle valve 7 respectively. When the third two-position four-way solenoid valve 18 is de-energized, it will feed back the pressure of the third shuttle valve 8 to the second shuttle valve 7.The first shuttle valve 6 is connected to the second shuttle valve 7, and the second shuttle valve 7 is connected to the feedback port of the first main pump 1. The second shuttle valve 7 takes the larger feedback pressure from the first shuttle valve 6 and the third shuttle valve 8 and feeds it back to the first main pump 1. It can be understood that the hydraulic system of the present invention, which combines load-sensitive control and constant pressure control, can switch the first main pump 1 between load-sensitive control mode and constant pressure control mode by controlling the on / off state of the electro-proportional relief valve 3, the first two-position four-way solenoid valve 4, the second two-position four-way solenoid valve 5, and the third two-position four-way solenoid valve 18.

[0027] In this invention, because the existing hydraulic system of the anchor-laying trolley lacks feedback ports for the first multi-way valve 16 and the second multi-way valve 17, the present invention provides a feedback port for this branch by switching valve assembly 15. This allows pressure feedback from both multi-way valves to be achieved without altering existing hydraulic components. Alternatively, in other embodiments of the invention, the first multi-way valve 16 and the second multi-way valve 17 can be replaced with electro-hydraulic proportional multi-way valves, enabling direct pressure feedback. For example... Figure 2 As shown, the switching valve group 15 includes a solenoid directional valve 151 and a damping element 152. The solenoid directional valve 151 is connected to the first check valve 2, the hydraulic oil tank 100, the first multi-way valve 16, and the damping element 152. The damping element 152 is connected to the fifth shuttle valve 10. When the solenoid directional valve 151 is energized, the pressure oil entering through port P7 is output to the first multi-way valve 16 through port P8. At the same time, the feedback oil path reaches the feedback oil port LS5 through the damping port on the damping element 152.

[0028] It is understood that the hydraulic system combining load-sensitive control and constant pressure control in this embodiment constructs a switchable feedback oil circuit between the first main pump 1 and multiple operation control modules through an electro-proportional relief valve 3, three two-position four-way solenoid valves, and multiple shuttle valves. Switching of the feedback oil circuit can be achieved simply by controlling the on / off state of the electro-proportional relief valve 3 and the three two-position four-way solenoid valves, thereby allowing the first main pump 1 to switch between load-sensitive control mode and constant pressure control mode. When the first main pump 1 operates in constant pressure control mode, it can provide a stable pressure and flow output for anchor bolt operations, and the left and right booms can simultaneously perform arch installation operations. When the first main pump 1 operates in load-sensitive mode, it can automatically adjust the pressure and flow of the first main pump 1 according to the load pressure, ensuring minimal energy consumption during boom movement and arch erection operations. This satisfies the different control requirements of three operating modes: anchor bolt operation alone, arch erection operation alone, and simultaneous anchor bolt and arch erection operations.

[0029] It is understood that in this invention, the anchor bolt drilling control module 11 is used to control the anchor bolt movement, the intermediate arch anchor boom control module 12 is used to control the intermediate arch anchor boom movement, the left arch boom control module 13 is used to control the left side boom movement, and the right arch boom control module 14 is used to control the right side boom movement. The simultaneous operation of the intermediate arch anchor boom control module 12 and the anchor bolt drilling control module 11 can realize the arch frame transportation function. The simultaneous operation of the left arch boom control module 13, the right arch boom control module 14, and the intermediate arch anchor boom control module 12 can realize the boom arch erection operation. The simultaneous operation of the intermediate arch anchor boom control module 12 and the anchor bolt drilling control module 11 can realize the intermediate boom anchor bolt operation. The simultaneous operation of the left arch boom control module 13, the right arch boom control module 14, the intermediate arch anchor boom control module 12, and the anchor bolt drilling control module 11 can realize the simultaneous operation of anchor bolts and arch erection. The anchor drilling control module 11, the intermediate arch anchor boom control module 12, the left arch boom control module 13, and the right arch boom control module 14 are all existing modules of the arch anchor operation trolley, and their specific structures and principles will not be described in detail here. Additionally, the first multi-way valve 16 is connected to the cable reel motor 41, enabling precise control of the reel's winding and unwinding speed and pressure; the second multi-way valve 17 is connected to the first outrigger cylinder 42, the second outrigger cylinder 43, the third outrigger cylinder 44, the fourth outrigger cylinder 45, the fifth outrigger cylinder 46, and the sixth outrigger cylinder 47, enabling precise control of the outrigger winding and unwinding speed and pressure.

[0030] It is understood that when the electro-proportional overflow valve 3, the first two-position four-way solenoid valve 4, the second two-position four-way solenoid valve 5, and the third two-position four-way solenoid valve 18 are all energized, the pressure of the anchor bolt drilling control module 11, the intermediate arch anchor boom control module 12, the left arch boom control module 13, the right arch boom control module 14, and the switching valve group 15 cannot be fed back to the first main pump 1. The pressure at the outlet of the first main pump 1 is only fed back to the feedback port of the first main pump 1 through the first two-position four-way solenoid valve 4, and the first main pump 1 switches to constant pressure control mode.

[0031] When the electro-proportional overflow valve 3, the first two-position four-way solenoid valve 4, and the third two-position four-way solenoid valve 18 are all de-energized, the feedback pressure of the intermediate arch boom control module 12, the left arch boom control module 13, the right arch boom control module 14, and the switching valve group 15 is compared by the second shuttle valve 7, the third shuttle valve 8, the fourth shuttle valve 9, and the fifth shuttle valve 10, and the maximum feedback pressure is taken. The maximum feedback pressure is then fed back to the feedback port of the first main pump 1, and the first main pump 1 switches to the load-sensitive control mode.

[0032] Specifically, Figure 1The first two-position four-way solenoid valve 4, the second two-position four-way solenoid valve 5, and the third two-position four-way solenoid valve 18 shown are all de-energized. In the anchor bolt standalone operation mode or the anchor bolt and arch erection simultaneous operation mode, the control proportional relief valve 3, the first two-position four-way solenoid valve 4, the second two-position four-way solenoid valve 5, and the third two-position four-way solenoid valve 18 are energized. At this time, the outlet pressure of the first main pump 1 is fed back to the first shuttle valve 6 through the first two-position four-way solenoid valve 4. Because the second two-position four-way solenoid valve 5 is energized, the pressure at port LS1 of the anchor bolt drilling control module 11 cannot be fed back to the first shuttle valve 6. Therefore, the first shuttle valve 6 only feeds back the outlet pressure of the first main pump 1 to the second shuttle valve 7. Simultaneously, because the third two-position four-way solenoid valve 18 is energized, the feedback pressures from the intermediate arch anchor boom control module 12, the left arch boom control module 13, the right arch boom control module 14, and the switching valve group 15 cannot be fed back to the second shuttle valve 7. Therefore, the second shuttle valve 7 only feeds back the outlet pressure of the first main pump 1 to the feedback port of the first main pump 1, so that the first main pump 1 operates in constant pressure mode. Furthermore, the operating pressure of the first main pump 1 in constant pressure mode can be controlled by adjusting the overflow pressure of the electro-proportional relief valve 3, making adjustment very convenient.

[0033] In the stand-alone arch operation mode, the control proportional relief valve 3, the first two-position four-way solenoid valve 4, and the third two-position four-way solenoid valve 18 are all de-energized. At this time, because the first two-position four-way solenoid valve 4 is de-energized, the feedback pressure oil flowing through the first two-position four-way solenoid valve 4 flows directly back to the hydraulic oil tank 100, and the outlet pressure of the first main pump 1 cannot be fed back to the first shuttle valve 6. In the stand-alone arch operation mode, the anchor bolt drilling control module 11 does not work, so the feedback pressure at the LS1 port of the anchor bolt drilling control module 11 is zero. At this time, the second two-position four-way solenoid valve 5 can be energized or de-energized. Therefore, the first shuttle valve 6 has no pressure feedback to the second shuttle valve 7. Simultaneously, the feedback pressure oil from the LS3 port of the left boom control module 13 and the feedback pressure oil from the LS4 port of the right boom control module 14 are compared by the fourth shuttle valve 9, and the larger feedback pressure value is taken. Then, it is compared with the feedback pressure oil from the LS5 port of the switching valve group 15 by the fifth shuttle valve 10, and the larger feedback value is taken again. Then, it is compared with the feedback pressure oil from the LS2 port of the middle boom control module 12 by the third shuttle valve 8, and the larger feedback pressure value is taken. After the comparison by the three shuttle valves one by one, the maximum feedback pressure value among the middle boom control module 12, the left boom control module 13, the right boom control module 14 and the switching valve group 15 is taken, and output to the second shuttle valve 7 through the third two-position four-way solenoid valve 18. Therefore, the second shuttle valve 7 only feeds back the maximum feedback pressure value from the middle arch boom control module 12, the left arch boom control module 13, the right arch boom control module 14 and the switching valve group 15 to the feedback port of the first main pump 1, so that the first main pump 1 works in load-sensitive control mode, thereby automatically adjusting the pressure and flow of the first main pump 1 according to the load pressure, ensuring the lowest energy consumption during boom operation and arch erection, and enabling simultaneous full-flow operation of the left, middle and right booms.

[0034] Optionally, the hydraulic system further includes a second main pump 19, a second check valve 20, and a sixth shuttle valve 21. The second main pump 19 is connected to the hydraulic oil tank 100 and the second check valve 20, respectively. The second check valve 20 is connected to the working ports of the anchor drilling control module 11, the intermediate arch anchor boom control module 12, the left arch boom control module 13, the right arch boom control module 14, and the switching valve group 15, respectively. The sixth shuttle valve 21 is connected to the feedback port of the third two-position four-way solenoid valve 18, the second two-position four-way solenoid valve 5, and the second main pump 19, so that the second main pump 19 serves as a backup for the first main pump 1 in the load-sensitive control mode.

[0035] It is understandable that in the stand-alone arch operation mode, when load-sensitive control is required, when the first main pump 1 is working and the second main pump 19 is not working, the control of the electro-proportional overflow valve 3, the first two-position four-way solenoid valve 4 and the third two-position four-way solenoid valve 18 are all de-energized. The feedback pressure of the intermediate arch anchor boom control module 12, the left arch boom control module 13, the right arch boom control module 14 and the switching valve group 15 is compared by the second shuttle valve 7, the third shuttle valve 8, the fourth shuttle valve 9 and the fifth shuttle valve 10, and the maximum feedback pressure is taken. The maximum feedback pressure is fed back to the feedback port of the first main pump 1, and the first main pump 1 switches to the load-sensitive control mode.

[0036] When the first main pump 1 is not working and the second main pump 19 is working, the third two-position four-way solenoid valve 18 is energized. The feedback pressures of the intermediate arch boom control module 12, the left arch boom control module 13, the right arch boom control module 14, and the switching valve group 15 are compared by the third shuttle valve 8, the fourth shuttle valve 9, the fifth shuttle valve 10, and the sixth shuttle valve 21, and the maximum feedback pressure is taken. This maximum feedback pressure is then fed back to the feedback port of the second main pump 19, and the second main pump 19 switches to the load-sensitive control mode. Specifically, since the first main pump 1 is not working, the electro-proportional relief valve 3 and the first two-position four-way solenoid valve 4 are also not working. The feedback pressure oil from the LS3 port of the left arch boom control module 13 and the feedback pressure oil from the LS4 port of the right arch boom control module 14 are compared by the fourth shuttle valve 9, and the larger feedback pressure value is taken. Then, it is compared with the feedback pressure oil from the LS5 port of the switching valve group 15 by the fifth shuttle valve 10, and the larger feedback value is taken again. Next, it is compared with the feedback pressure oil from the LS2 port of the middle arch anchor boom control module 12 by the third shuttle valve 8, and the larger feedback pressure value is taken. After comparison by the three shuttle valves one by one, the maximum feedback pressure value among the middle arch anchor boom control module 12, the left arch boom control module 13, the right arch boom control module 14, and the switching valve group 15 is taken, and output to the sixth shuttle valve 21 through the third two-position four-way solenoid valve 18. Moreover, since the anchor bolt drilling control module 11 does not work in the arch-standing operation mode, the feedback pressure of the LS1 port of the anchor bolt drilling control module 11 is zero, and the second two-position four-way solenoid valve 5 can be energized or de-energized. At this time, the sixth shuttle valve 21 feeds back the maximum feedback pressure value from the intermediate arch boom control module 12, the left arch boom control module 13, the right arch boom control module 14 and the switching valve group 15 to the feedback port of the second main pump 19, and the second main pump 19 switches to the load-sensitive control mode.

[0037] Optionally, the first main pump 1 is driven by the first motor 22, and the second main pump 19 is driven by the engine 23. When the first motor 22 fails, the engine 23 can drive the second main pump 19 to provide an emergency oil source, which can retract each boom and propulsion beam cylinder in an emergency or perform arch erection operations for a short time, thus improving the reliability of the system.

[0038] It is understood that in the preferred embodiment of the present invention, only the first main pump 1 is activated in constant pressure mode, while in load-sensitive control mode, either the first main pump 1 or the second main pump 19 can be activated. Furthermore, in constant pressure control mode, the arch-anchoring trolley can perform anchor bolt operation alone or simultaneous anchor bolt and arch erection operation, while in load-sensitive control mode, the arch-anchoring trolley performs arch erection operation alone.

[0039] Optionally, the hydraulic system further includes a first gear pump 24, which is connected to the hydraulic oil tank 100 and the anchor bolt drilling control module 11. The first gear pump 24 provides auxiliary oil supply during anchor bolt operation or simultaneous anchor bolt and arch erection, better meeting the demand for high-flow-rate oil supply. The first gear pump 24 is connected in series with the first main pump 1 and the first motor 22. Of course, in other embodiments of the invention, the first gear pump 24 can also be driven by a separate motor.

[0040] Optionally, the hydraulic system further includes a second gear pump 25 and an air cooler 26. The second gear pump 25 is connected to the hydraulic oil tank 100 and the motor of the air cooler 26, respectively. The air cooler 26 is also connected to the return oil port R2 of the anchor bolt drilling control module 11, the return oil port R3 of the intermediate arch anchor boom control module 12, the return oil port R4 of the left arch boom control module 13, the return oil port R5 of the right arch boom control module 14, the return oil port R7 of the first multi-way valve 16, and the return oil port R6 of the second multi-way valve 17, for air cooling of the return oil. The second gear pump 25 is driven by a second motor 48. Of course, in other embodiments of the present invention, the second gear pump 25 can also be driven by a first motor 22. Furthermore, both the first motor 22 and the second motor 48 are preferably asynchronous motors. Preferably, the hydraulic system also includes a water cooler 36, which is connected to another oil return port of the anchor drilling control module 11. The water cooler 36 is used to cool the return oil of the rock drill by water. The water used for slag removal during anchor drilling can be used to cool the return oil of the rock drill during anchor drilling, realizing a dual cooling mode of air cooling + water cooling, ensuring heat dissipation while avoiding power loss and waste.

[0041] Optionally, the hydraulic system further includes a third gear pump 27 and a filling valve 28. The third gear pump 27 is connected to the hydraulic oil tank 100 and the filling valve 28, respectively. The filling valve 28 is also connected to the motors of the parking brake 29, steering gear 30, brake valve 31, accumulator group 32, and air cooler 26, respectively. This allows the third gear pump 27 and the second gear pump 25 to serve as backups for each other during air cooling. When the second gear pump 25 is not working and the vehicle is not braked, the filling valve 28 can provide pressurized oil to the motor of the air cooler 26. In addition, the third gear pump 27 is preferably driven by the engine 23. The steering gear 30 is also connected to the first steering cylinder 34, the second steering cylinder 35, and the hydraulic oil tank 100, respectively, for driving the steering wheel to achieve left or right steering, and for releasing oil when not steering. The brake valve 31 is connected to the service brake 33 for implementing the foot brake function, while the accumulator group 32 is used to provide continuous and reliable braking power to the service brake 33.

[0042] Optionally, a first filter 37 is provided after the first check valve 2, and a second filter 38 is provided after the second check valve 20, thereby filtering the pressurized oil supplied by the first main pump 1 and the second main pump 19, respectively. Furthermore, the main oil circuits of the first main pump 1 and the second main pump 19 are also connected to the hydraulic oil tank 100 via a first relief valve 39, and the main oil circuit of the second gear pump 25 is also connected to the hydraulic oil tank 100 via a second relief valve 40. The relief valves limit the maximum pressure in the oil circuits, improving the safety and reliability of the hydraulic system. Additionally, the first relief valve 39 and the second relief valve 40 are also connected to an air cooler 26 to cool the overflowing oil.

[0043] In addition, another embodiment of the present invention provides an arch anchor operation trolley, which preferably employs a hydraulic system combining load-sensitive control and constant pressure control as described above.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0045] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A hydraulic system combining load-sensitive control and constant pressure control, characterized in that, The system includes a first main pump (1), a first check valve (2), an electro-proportional relief valve (3), a first two-position four-way solenoid valve (4), a second two-position four-way solenoid valve (5), a third two-position four-way solenoid valve (18), a first shuttle valve (6), a second shuttle valve (7), a third shuttle valve (8), a fourth shuttle valve (9), a fifth shuttle valve (10), an anchor drilling control module (11), a middle arch anchor boom control module (12), a left arch boom control module (13), a right arch boom control module (14), a switching valve group (15), a first multi-way valve (16), and a second multi-way valve (17). The first main pump (1) is connected to the hydraulic oil tank (100), the inlet of the first check valve (2), and the inlet of the electro-proportional relief valve (3), respectively. The inlet of the first two-position four-way solenoid valve (4) is connected, and the outlet of the electro-proportional relief valve (3) and the outlet of the first two-position four-way solenoid valve (4) are both connected to the hydraulic oil tank (100). One working port of the first two-position four-way solenoid valve (4) is also connected to one inlet of the first shuttle valve (6). The other working port of the first two-position four-way solenoid valve (4) is closed. The outlet of the first one-way valve (2) is connected to the working ports of the anchor drilling control module (11), the intermediate arch anchor boom control module (12), the left arch boom control module (13), the right arch boom control module (14), and the switching valve group (15), respectively. The first multi-way valve (16) is connected to the switching valve group (15) and the second multi-way valve (17), respectively. The switching valve group (15) is connected to realize the pressure feedback of the first multi-way valve (16) and the second multi-way valve (17); the inlet of the second two-position four-way solenoid valve (5) is connected to the feedback port of the anchor bolt drilling control module (11), one working port of the second two-position four-way solenoid valve (5) is connected to the other inlet of the first shuttle valve (6), the two inlets of the fourth shuttle valve (9) are respectively connected to the feedback ports of the left arch boom control module (13) and the right arch boom control module (14), the two inlets of the fifth shuttle valve (10) are also respectively connected to the feedback port of the switching valve group (15) and the outlet of the fourth shuttle valve (9), and the outlet of the fifth shuttle valve (10) is connected to the middle arch anchor boom control module (11). 2) The feedback oil port is connected to the two inlets of the third shuttle valve (8), the inlet of the third two-position four-way solenoid valve (18) is connected to the outlet of the third shuttle valve (8), one working oil port of the third two-position four-way solenoid valve (18) is connected to one inlet of the second shuttle valve (7), the outlet of the first shuttle valve (6) is connected to the other inlet of the second shuttle valve (7), and the outlet of the second shuttle valve (7) is connected to the feedback port of the first main pump (1). By controlling the gain and loss of power of the electro-proportional relief valve (3), the first two-position four-way solenoid valve (4), the second two-position four-way solenoid valve (5) and the third two-position four-way solenoid valve (18), the first main pump (1) can switch between load-sensitive control mode and constant pressure control mode. When the electro-proportional overflow valve (3), the first two-position four-way solenoid valve (4), the second two-position four-way solenoid valve (5) and the third two-position four-way solenoid valve (18) are all energized, the pressure of the anchor bolt drilling control module (11), the intermediate arch anchor boom control module (12), the left arch boom control module (13), the right arch boom control module (14) and the switching valve group (15) cannot be fed back to the first main pump (1). The pressure of the outlet of the first main pump (1) is fed back to the feedback port of the first main pump (1) only through the first two-position four-way solenoid valve (4), and the first main pump (1) switches to constant pressure control mode. When the electro-proportional overflow valve (3), the first two-position four-way solenoid valve (4) and the third two-position four-way solenoid valve (18) are all de-energized, the feedback pressure of the intermediate arch boom control module (12), the left arch boom control module (13), the right arch boom control module (14) and the switching valve group (15) are compared by the second shuttle valve (7), the third shuttle valve (8), the fourth shuttle valve (9) and the fifth shuttle valve (10) to take the maximum feedback pressure, and the maximum feedback pressure is fed back to the feedback port of the first main pump (1), and the first main pump (1) switches to the load sensitive control mode; It also includes a second main pump (19), a second check valve (20) and a sixth shuttle valve (21). The second main pump (19) is connected to the hydraulic oil tank (100) and the inlet of the second check valve (20). The outlet of the second check valve (20) is connected to the working ports of the anchor drilling control module (11), the intermediate arch anchor boom control module (12), the left arch boom control module (13), the right arch boom control module (14), and the switching valve group (15). The two inlets of the sixth shuttle valve (21) are connected to the other working port of the third two-position four-way solenoid valve (18) and the other working port of the second two-position four-way solenoid valve (5). The outlet of the sixth shuttle valve (21) is connected to the feedback port of the second main pump (19). The outlet of the second two-position four-way solenoid valve (5) and the outlet of the third two-position four-way solenoid valve are both connected to the hydraulic oil tank (100), so that the second main pump (19) and the first main pump (1) are backups of each other in the load-sensitive control mode. When the first main pump (1) is working, if the electro-proportional overflow valve (3), the first two-position four-way solenoid valve (4) and the third two-position four-way solenoid valve (18) are all de-energized, the feedback pressure of the intermediate arch boom control module (12), the left arch boom control module (13), the right arch boom control module (14) and the switching valve group (15) are compared by the second shuttle valve (7), the third shuttle valve (8), the fourth shuttle valve (9) and the fifth shuttle valve (10) to take the maximum feedback pressure, and the maximum feedback pressure is fed back to the feedback port of the first main pump (1), and the first main pump (1) switches to the load-sensitive control mode; When the second main pump (19) is working, if the third two-position four-way solenoid valve (18) is energized, the feedback pressure of the intermediate arch boom control module (12), the left arch boom control module (13), the right arch boom control module (14) and the switching valve group (15) are compared by the third shuttle valve (8), the fourth shuttle valve (9), the fifth shuttle valve (10) and the sixth shuttle valve (21) to take the maximum feedback pressure, and feed the maximum feedback pressure back to the feedback port of the second main pump (19), and the second main pump (19) switches to the load-sensitive control mode.

2. The hydraulic system combining load-sensitive control and constant pressure control as described in claim 1, characterized in that, The first main pump (1) is driven by the first motor (22), and the second main pump (19) is driven by the engine (23).

3. The hydraulic system combining load-sensitive control and constant pressure control as described in claim 1, characterized in that, It also includes a first gear pump (24), which is connected to the hydraulic oil tank (100) and the anchor drilling control module (11) respectively.

4. The hydraulic system combining load-sensitive control and constant pressure control as described in claim 1, characterized in that, It also includes a second gear pump (25) and an air cooler (26). The second gear pump (25) is connected to the hydraulic oil tank (100) and the motor of the air cooler (26) respectively. The air cooler (26) is also connected to the return port of the anchor drilling control module (11), the intermediate arch anchor boom control module (12), the left arch boom control module (13), the right arch boom control module (14), the first multi-way valve (16), and the second multi-way valve (17) for air cooling of the return oil.

5. The hydraulic system combining load-sensitive control and constant pressure control as described in claim 4, characterized in that, It also includes a third gear pump (27) and a filling valve (28). The third gear pump (27) is connected to the hydraulic oil tank (100) and the filling valve (28) respectively. The filling valve (28) is also connected to the motors of the parking brake (29), steering gear (30), brake valve (31), accumulator group (32), and air cooler (26) respectively, so that the third gear pump (27) and the second gear pump (25) can serve as backups for each other when air cooling is used.

6. The hydraulic system combining load-sensitive control and constant pressure control as described in claim 4, characterized in that, It also includes a water cooler (36), which is connected to another oil return port of the anchor drilling control module (11) for water cooling of the rock drill oil return.

7. An arch anchor operation trolley, characterized in that, A hydraulic system employing the combination of load-sensitive control and constant pressure control as described in any one of claims 1 to 6.

Images