A hydraulic valve for underground scraper

Abstract

The present invention relates to the technical field of hydraulic equipment, and discloses a hydraulic valve for an underground scraper, comprising a front cover, a rear cover arranged on one side of the front cover, a valve body assembly fixedly installed between the front cover and the rear cover, an inner tank assembly arranged inside the front cover, the valve body assembly and the rear cover, a valve core mechanism movably installed inside the inner tank assembly, and an adjusting assembly movably installed inside the valve body assembly, wherein the valve body assembly comprises a valve body shell fixedly installed between the front cover and the rear cover, a driving rod drives the movement of a left-position valve core, a sliding throttling block, a middle-position valve core and a right-position valve core to control the flow direction of liquid oil, a left-position extrusion block and a right-position extrusion block are pressed downward to close the position valve to control the flow path of the liquid oil, and a space between the bottom of the sliding throttling block and the corresponding oil delivery tank to control the flow of a single-position valve, thereby achieving the effect of improving system integration and reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic equipment, and in particular to a hydraulic valve for an underground scraper. Background Art

[0002] An underground loader is a type of engineering machinery specially used for material handling in underground mining and construction. It can perform loading and transportation tasks in narrow, low-ceiling and poorly ventilated environments. The hydraulic valve is one of the indispensable key components of an underground loader. It is mainly used to control the flow direction, pressure and flow of the liquid in the hydraulic system, and to achieve motion control of the loader's various working mechanisms (such as bucket, steering, walking, etc.).

[0003] The patent with the patent publication number CN112682388A discloses a hydraulic spring cylinder for underground scraper trailer system, which relates to the technical field of hydraulic equipment. The present invention includes a cylinder body, two baffles and a telescopic shaft. The two ends of the cylinder body are fixedly connected to the baffles, and the telescopic shaft is slidably connected to the baffle at one end of the cylinder body, and the telescopic shaft extends to the inside of the cylinder body. The present invention simplifies the structure by using a pressure relief rod and a cooling chamber, and adopts a multi-stage pressure relief method, which is beneficial to protect the equipment; the present invention uses a heat exchange tube to cool the oil in the cylinder body to avoid overheating; the present invention uses a distance sensor, when the oil pressure in the boost chamber increases to a certain extent, the pressure relief rod can move to the right to relieve pressure, and then the distance sensor can sense the position of the pressure relief rod and send a signal in time to remind the user that the oil pressure in the pressure relief chamber has reached the threshold value and stop boosting.

[0004] The prior art has the following defects:

[0005] Existing hydraulic valves are not suitable for the working environment of underground loaders: underground loaders are often used in underground mines and tunnels. The space in underground mines and tunnels is narrow, which limits the size and installation position of the hydraulic valve. The environment is relatively humid and dusty, which will cause the sealing performance of the hydraulic valve to deteriorate and increase the risk of leakage and blockage. It is also accompanied by high vibration and impact, which will cause the internal parts of the hydraulic valve to loosen or be damaged. Therefore, it is necessary to set up a compact hydraulic valve to adapt to the narrow underground space, reduce the complexity of the pipeline, reduce the risk of leakage, improve the temperature distribution and heat dissipation performance, ensure stable operation in harsh environments, and achieve the effect of improving overall reliability and operating comfort.

[0006] The existing hydraulic valves have a single working mode and are not suitable for the complex operation of underground loaders: underground loaders usually require the use of multiple hydraulic valves to cope with complex working environments and diverse operating requirements, such as directional control valves, pressure control valves and flow control valves. However, more hydraulic valves not only take up a large installation space and are difficult to adapt to narrow spaces, but are also more inconvenient to maintain. Therefore, it is necessary to compactly arrange multiple valves together to improve the system integration and reliability. Summary of the invention

[0007] In view of the problems in the prior art that the existing hydraulic valves are not suitable for the working environment of underground scrapers and the existing hydraulic valves are single-function and not suitable for the complex operations of underground scrapers, a hydraulic valve for underground scrapers is proposed.

[0008] The present application provides a hydraulic valve for an underground shovel loader, the purpose of which is to adapt to narrow underground spaces by providing an integrated valve body assembly, a valve core mechanism, and an inner groove assembly, reduce pipeline complexity, reduce leakage risks, improve temperature distribution and heat dissipation performance, ensure stable operation in harsh environments, and achieve the effect of improving overall reliability and operating comfort. By providing a throttling assembly and an adjustment assembly, they are combined into a multifunctional hydraulic valve to achieve the effect of improving system integration and reliability.

[0009] The technical scheme of the present invention is: a hydraulic valve for an underground scraper, comprising a front cover, a rear cover arranged on one side of the front cover, a valve body assembly fixedly installed between the front cover and the rear cover, an inner groove assembly arranged inside the front cover, the valve body assembly and the rear cover, a valve core mechanism movably installed inside the inner groove assembly, and an adjusting assembly movably installed inside the valve body assembly, wherein the valve body assembly comprises a valve body shell fixedly installed between the front cover and the rear cover, the inner groove assembly comprises a sliding groove and a valve core groove opened inside the front cover, the valve body shell and the rear cover, the valve core mechanism comprises a driving rod slidably connected to the inner wall of the sliding groove, and the outer wall of the driving rod is movably connected with a plurality of throttling assemblies;

[0010] The throttling assembly includes a sliding throttling block slidably connected to the inner wall of the valve core groove, the inner wall of the sliding throttling block is provided with a limiting groove, a return spring is arranged inside the limiting groove, the two ends of the return spring are respectively fixedly connected to the inner walls of the sliding throttling block and the driving rod, a diversion groove is provided at the bottom of the sliding throttling block, and a pressure seat is fixedly connected to the top of the sliding throttling block.

[0011] By adopting the above scheme, through the throttling component, when only a single control valve is needed to deliver oil, the sliding throttling block is squeezed downward by pressing against the pressure seat through the adjusting component control, and when the diverter groove at the bottom of the sliding throttling block closes the single control valve, it plays the role of only the other control valve delivering oil; when the flow of a single control valve needs to be controlled, while closing the other control valve for oil delivery, the flow is controlled by the space between the bottom of the sliding throttling block and the corresponding single control valve, which plays the role of controlling the flow of the single control valve.

[0012] Furthermore, the valve core mechanism also includes a left-position valve core, a middle-position valve core and a right-position valve core which are slidably connected to the inner wall of the valve core groove, the middle-position valve core is arranged between the left-position valve core and the right-position valve core, and the two sides of the middle-position valve core are slidably connected to the sliding throttling block between the left-position valve core and the right-position valve core respectively, and the outer walls of the left-position valve core, the middle-position valve core and the right-position valve core are fixedly installed with sealing rings.

[0013] By adopting the above scheme, the driving rod drives the movement of the left valve core, the sliding throttle block, the middle valve core and the right valve core to control the flow direction of the liquid oil, thereby playing the role of a reversing valve.

[0014] Furthermore, the inner tank assembly also includes a plurality of oil delivery tanks opened inside the valve body shell, and the plurality of oil delivery tanks are all connected to the valve core tank, and the two oil delivery tanks with the farthest relative distance are fixedly connected with diverter blocks, and the outer wall of the diverter block overlaps the inner wall of the diverter tank.

[0015] By adopting the above scheme, through the inner groove assembly, the oil valve core groove and the oil delivery groove flow from each control valve into the corresponding hydraulic cylinder, and the return oil can flow back to the hydraulic pump from the oil delivery valve through the valve core groove and the oil delivery groove, thereby providing a oil channel.

[0016] Furthermore, a first oil delivery valve, an oil return valve and a second oil delivery valve are fixedly mounted on the outer wall of the valve body shell, and the first oil delivery valve, the oil return valve and the second oil delivery valve are respectively connected to three oil delivery grooves at the middle position.

[0017] Furthermore, a first left-position valve and a second left-position valve are fixedly mounted on the outer wall of the valve body shell close to the front cover, and the first left-position valve and the second left-position valve are both connected to the oil delivery groove close to the front cover.

[0018] Furthermore, a first right-position valve and a second right-position valve are fixedly mounted on the outer wall of the valve body shell close to the rear cover, and the first right-position valve and the second right-position valve are both connected to the oil delivery tank close to the rear cover.

[0019] By adopting the above scheme, the first oil delivery valve, the second oil delivery valve and the regulating oil delivery valve are connected to the hydraulic pump through the oil delivery pipe, and the first left-position valve, the second left-position valve, the return oil valve, the first right-position valve and the second right-position valve are connected to the corresponding hydraulic cylinder through the oil delivery pipe, thereby connecting the hydraulic valves, the hydraulic pump and the hydraulic cylinder.

[0020] Furthermore, the regulating assembly includes a regulating oil delivery valve fixedly mounted on the outer wall of the valve body shell, the bottom of the regulating oil delivery valve is fixedly connected to two main flow pipes, and the outer walls of the two main flow pipes are slidably connected to left-position extrusion blocks.

[0021] Furthermore, the outer wall of the main flow pipe is fixedly connected with an auxiliary flow pipe that runs through the interior of the valve body shell, and the outer walls of the two auxiliary flow pipes are both slidably connected with a right-position extrusion block.

[0022] Furthermore, the left extrusion block and the right extrusion block are both slidably connected to the inner wall of the valve body shell, and an extrusion spring is fixedly connected between the inner walls of the left extrusion block and the right extrusion block and the inner wall of the valve body shell.

[0023] By adopting the above scheme, through the setting of the regulating component, when only the first left-position valve is needed to deliver oil, the oil delivery valve is adjusted to control the oil inlet, and the liquid oil flows into the corresponding left-position extrusion block through the main flow pipe corresponding to the second left-position valve, and the left-position extrusion block presses down to squeeze the sliding throttle block to close the second left-position valve; when it is necessary to control the flow of the first left-position valve, while closing the second left-position valve, the oil delivery valve is adjusted to control the oil inlet, and the liquid oil flows into the corresponding left-position extrusion block through the main flow pipe corresponding to the first left-position valve, and the left-position extrusion block presses down to squeeze the sliding throttle block to control the space between the bottom of the sliding throttle block and the corresponding oil delivery groove to control the flow.

[0024] Beneficial effects of the present invention:

[0025] The driving rod drives the movement of the left valve core, the sliding throttle block, the middle valve core and the right valve core to control the flow direction of the liquid oil, the downward pressing of the left extrusion block and the right extrusion block to close the position valve to control the flow path of the liquid oil, and the space between the bottom of the sliding throttle block and the corresponding oil delivery groove to control the flow of a single position valve. In this way, multiple valves are compactly arranged together to achieve the effect of improving system integration and reliability.

[0026] By setting up the throttling component and the adjusting component, when only a single control valve is needed to deliver oil, the adjusting component is controlled to press down against the pressure seat to squeeze the sliding throttling block downward, and when the diverter groove at the bottom of the sliding throttling block closes the single control valve, it plays the role of only the other control valve delivering oil; when the flow of a single control valve needs to be controlled, while the other control valve is closed for oil delivery, the flow is controlled by the space between the bottom of the sliding throttling block and the corresponding single control valve, thereby playing the role of controlling the flow of the single control valve.

[0027] By setting up an integrated valve body assembly, a valve core mechanism and an inner groove assembly, when it is necessary to control the hydraulic cylinder connected to the first left-position valve and the second left-position valve, the operation control device drives the drive rod to move in the direction of the front cover, so that the two sliding throttling blocks close to the front cover are placed under the left-position extrusion block to transport and return oil. When it is necessary to control the hydraulic cylinder connected to the first right-position valve and the second right-position valve, the drive rod can be operated in the reverse direction. In this way, it can adapt to narrow underground spaces, reduce pipeline complexity, reduce leakage risks, improve temperature distribution and heat dissipation performance, ensure stable operation in harsh environments, and achieve the effect of improving overall reliability and operating comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0029] Figure 2 It is a top view of the main structure of the present invention;

[0030] Figure 3 It is a schematic diagram of the structural cross-section of the valve body assembly of the present invention;

[0031] Figure 4 It is a structural schematic diagram of the valve core mechanism of the present invention;

[0032] Figure 5 It is a structural schematic diagram of the inner tank assembly of the present invention;

[0033] Figure 6 This is a schematic diagram of the flow state of the left-position valve of the present invention;

[0034] Figure 7 This is a schematic diagram of the stopped circulation state of the present invention;

[0035] Figure 8 This is a schematic diagram of the flow state of the right valve of the present invention;

[0036] Fig. 9 It is a schematic diagram of the structural cross section of the throttling component of the present invention;

[0037] Fig.10 It is a schematic diagram of the flow state of a single left-position valve of the present invention;

[0038] Fig.11 It is a schematic diagram of the throttling process state of the present invention;

[0039] Fig.12 It is a schematic diagram of the structure of the regulating component of the present invention.

[0040] In the figure:

[0041] 1. Front cover; 2. Valve body assembly; 21. Valve body shell; 22. First oil delivery valve; 23. Second oil delivery valve; 24. First left-position valve; 25. Second left-position valve; 26. Oil return valve; 27. First right-position valve; 28. Second right-position valve; 3. Back cover; 4. Valve core mechanism; 41. Drive rod; 42. Left-position valve core; 43. Throttle assembly; 431. Sliding throttle block; 432. Diverter slot; 433 , pressure seat; 434, limit groove; 435, return spring; 44, middle valve core; 45, right valve core; 46, sealing ring; 5, adjustment assembly; 51, oil delivery valve; 52, main flow pipe; 53, left extrusion block; 54, auxiliary flow pipe; 55, right extrusion block; 56, extrusion spring; 6, inner groove assembly; 61, sliding groove; 62, valve core groove; 63, oil delivery groove; 64, diverter block. DETAILED DESCRIPTION

[0042] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0043] Reference Figure 1 - Fig.12 , provides a hydraulic valve for an underground scraper, comprising a front cover 1, a rear cover 3 arranged on one side of the front cover 1, a valve body assembly 2 fixedly installed between the front cover 1 and the rear cover 3, an inner tank assembly 6 arranged inside the front cover 1, the valve body assembly 2 and the rear cover 3, a valve core mechanism 4 movably installed inside the inner tank assembly 6, and an adjusting assembly 5 movably installed inside the valve body assembly 2, characterized in that: the valve body assembly 2 comprises a valve body shell 21 fixedly installed between the front cover 1 and the rear cover 3, the inner tank assembly 6 comprises a sliding groove 61 and a valve core groove 62 opened inside the front cover 1, the valve body shell 21 and the rear cover 3, the valve core mechanism 4 comprises a driving rod 41 slidably connected to the inner wall of the sliding groove 61, and the outer wall of the driving rod 41 is movably connected with a plurality of throttling assemblies 43.

[0044] Reference Figure 4 - Fig.11 The throttling assembly 43 includes a sliding throttling block 431 which is slidably connected to the inner wall of the valve core groove 62. A limiting groove 434 is provided on the inner wall of the sliding throttling block 431. A return spring 435 is arranged inside the limiting groove 434. The two ends of the return spring 435 are respectively fixedly connected to the sliding throttling block 431 and the inner wall of the driving rod 41. A diverter groove 432 is provided at the bottom of the sliding throttling block 431. A pressure seat 433 is fixedly connected to the top of the sliding throttling block 431.

[0045] Specifically, the valve body shell 21 is connected to the front cover 1 and the rear cover 3 by bolts for easy disassembly and assembly. The drive rod 41 can be controlled by an electromagnetic, motor or cylinder to have push-pull control functions. The sliding throttle block 431 is triangular in shape and has rounded corners, which can reduce stress concentration points when the hydraulic valve is vibrated and improve the pressure resistance of the valve body.

[0046] Through the throttling component 43, when only a single control valve is needed to deliver oil, the sliding throttling block 431 is squeezed downward by pressing against the pressure seat 433 through the adjusting component 5. When the diverter groove 432 at the bottom of the sliding throttling block 431 closes the single control valve, it plays the role of only the other control valve delivering oil; when the flow of a single control valve needs to be controlled, while the other control valve is closed for oil delivery, the flow is controlled by the space between the bottom of the sliding throttling block 431 and the corresponding single control valve, thereby playing the role of controlling the flow of the single control valve.

[0047] Reference Figure 4The valve core mechanism 4 also includes a left valve core 42, a middle valve core 44 and a right valve core 45 which are slidably connected to the inner wall of the valve core groove 62. The middle valve core 44 is arranged between the left valve core 42 and the right valve core 45. The two sides of the middle valve core 44 are slidably connected to the sliding throttling block 431 between the left valve core 42 and the right valve core 45 respectively. The outer walls of the left valve core 42, the middle valve core 44 and the right valve core 45 are fixedly installed with sealing rings 46.

[0048] Specifically, the left valve core 42, the middle valve core 44 and the right valve core 45 are installed on the driving rod 41 in sequence, the sliding throttle block 431 is installed between the middle valve core 44 and the left valve core 42 and the right valve core 45, and the sliding throttle block 431 can slide up and down, and the setting of the sealing ring 46 can prevent liquid oil from flowing to the outside of the left valve core 42, the middle valve core 44 and the right valve core 45.

[0049] The driving rod 41 drives the movement of the left valve core 42, the sliding throttle block 431, the middle valve core 44 and the right valve core 45 to control the flow direction of the liquid oil, thereby playing the role of a reversing valve.

[0050] Reference Figure 5 The inner tank assembly 6 also includes a plurality of oil delivery grooves 63 opened inside the valve body shell 21, and the plurality of oil delivery grooves 63 are all connected to the valve core groove 62. The two oil delivery grooves 63 with the farthest relative distance are fixedly connected with a diverter block 64, and the outer wall of the diverter block 64 overlaps the inner wall of the diverter groove 432.

[0051] Through the inner tank assembly 6, the oil valve core groove 62 and the oil delivery groove 63 flow from each control valve into the corresponding hydraulic cylinder, and the return oil can flow back to the hydraulic pump from the oil delivery valve through the valve core groove 62 and the oil delivery groove 63, thereby providing an oil channel.

[0052] Reference Figure 3 - Figure 8 The first oil delivery valve 22, the oil return valve 26 and the second oil delivery valve 23 are fixedly installed on the outer wall of the valve body shell 21. The first oil delivery valve 22, the oil return valve 26 and the second oil delivery valve 23 are respectively connected to the three oil delivery grooves 63 in the middle position. The first left-position valve 24 and the second left-position valve 25 are fixedly installed on the outer wall of the valve body shell 21 near the front cover 1. The first left-position valve 24 and the second left-position valve 25 are both connected to the oil delivery groove 63 near the front cover 1. The first right-position valve 27 and the second right-position valve 28 are fixedly installed on the outer wall of the valve body shell 21 near the rear cover 3. The first right-position valve 27 and the second right-position valve 28 are both connected to the oil delivery groove 63 near the rear cover 3.

[0053] The first oil delivery valve 22, the second oil delivery valve 23 and the regulating oil delivery valve 51 are connected to the hydraulic pump through the oil delivery pipe, and the first left position valve 24, the second left position valve 25, the return oil valve 26, the first right position valve 27 and the second right position valve 28 are connected to the corresponding hydraulic cylinders through the oil delivery pipe, thereby connecting the hydraulic valves, hydraulic pumps and hydraulic cylinders.

[0054] Reference Fig. 9 - Fig.12 The regulating assembly 5 includes a regulating oil delivery valve 51 fixedly mounted on the outer wall of the valve body shell 21, two main flow pipes 52 are fixedly connected to the bottom of the regulating oil delivery valve 51, the outer walls of the two main flow pipes 52 are slidably connected with a left extrusion block 53, the outer wall of the main flow pipe 52 is fixedly connected with an auxiliary flow pipe 54 running through the inside of the valve body shell 21, the outer walls of the two auxiliary flow pipes 54 are slidably connected with a right extrusion block 55, the left extrusion block 53 and the right extrusion block 55 are slidably connected to the inner wall of the valve body shell 21, and an extrusion spring 56 is fixedly connected between the inner walls of the left extrusion block 53 and the right extrusion block 55 and the inner wall of the valve body shell 21.

[0055] Specifically, the regulating oil delivery valve 51 can control the flow of liquid oil into a single main flow pipe 52, and can also control the flow of liquid oil into both main flow pipes 52. The liquid oil is transported between the single left extrusion block 53 and the single right extrusion block 55 through the auxiliary flow pipe 54. The setting of the extrusion spring 56 can reset the left extrusion block 53 and the right extrusion block 55 when the regulating oil delivery valve 51 unloads oil.

[0056] Through the setting of the regulating component 5, when only the first left-position valve 24 is needed to deliver oil, the oil delivery valve 51 is adjusted to control the oil inlet, and the liquid oil flows into the corresponding left-position extrusion block 53 through the main flow pipe 52 corresponding to the second left-position valve 25, and the left-position extrusion block 53 presses down to squeeze the sliding throttle block 431 to close the second left-position valve 25; when it is necessary to control the flow of the first left-position valve 24, while closing the second left-position valve 25, the oil delivery valve 51 is adjusted to control the oil inlet, and the liquid oil flows into the corresponding left-position extrusion block 53 through the main flow pipe 52 corresponding to the first left-position valve 24, and the left-position extrusion block 53 presses down to squeeze the sliding throttle block 431 to control the space between the bottom of the sliding throttle block 431 and the corresponding oil delivery groove 63 to control the flow.

[0057] During use, when it is necessary to control the hydraulic cylinder connected to the first left-position valve 24 and the second left-position valve 25, the operation control device drives the drive rod 41 to move in the direction of the front cover 1, so that the two sliding throttle blocks 431 close to the front cover 1 are placed under the left-position extrusion block 53, and the first oil delivery valve 22 controls the oil inlet, and the liquid oil flows into the corresponding hydraulic cylinder from the first left-position valve 24 and the second left-position valve 25 through the valve core groove 62 and the oil delivery groove 63. The oil return valve 26 controls the oil return, and the return oil flows back to the hydraulic pump from the second oil delivery valve 23 through the valve core groove 62 and the oil delivery groove 63, which plays a role in controlling the hydraulic cylinders corresponding to the first left-position valve 24 and the second left-position valve 25. When it is necessary to control the hydraulic cylinder connected to the first right-position valve 27 and the second right-position valve 28, the drive rod 41 can be operated in the reverse direction. When only the first left-position valve 24 is needed to deliver oil, the oil delivery valve 51 is adjusted to control the oil inlet. The liquid oil flows into the corresponding left-position extrusion block 53 through the main flow passage 52 corresponding to the second left-position valve 25, and the left-position extrusion block 53 presses down against the pressure seat 433 to squeeze the sliding throttling block 431 downward, so that the diverter groove 432 at the bottom of the sliding throttling block 431 contacts the diverter block 64, and closes the second left-position valve 25, so that only the first left-position valve 24 can deliver oil. When it is necessary to control the flow of the first left-position valve 24, while closing the second left-position valve 25, the oil delivery valve 51 is adjusted to control the oil inlet, and the liquid oil flows into the corresponding left-position extrusion block 53 through the main flow passage 52 corresponding to the first left-position valve 24, and the left-position extrusion block 53 presses down against the pressure seat 433 to squeeze the sliding throttling block 431 downward, and the flow is controlled by the space between the bottom of the sliding throttling block 431 and the corresponding oil delivery groove 63, so as to control the flow of the first left-position valve 24.

[0058] Working principle of the present invention:

[0059] During operation, the hydraulic valve is installed between the hydraulic pump and the hydraulic cylinder of the underground scraper, the first oil valve 22, the second oil valve 23 and the regulating oil valve 51 are connected to the hydraulic pump through the oil pipe, the first left position valve 24, the second left position valve 25, the return oil valve 26, the first right position valve 27 and the second right position valve 28 are connected to the corresponding hydraulic cylinders through the oil pipe, and the drive rod 41 is connected to the control device of the underground scraper.

[0060] When it is necessary to control the hydraulic cylinder connected to the first left-position valve 24 and the second left-position valve 25, the operation control device drives the drive rod 41 to move in the direction of the front cover 1, so that the two sliding throttling blocks 431 close to the front cover 1 are placed under the left-position extrusion block 53, and the first oil delivery valve 22 controls the oil inlet, and the liquid oil flows into the corresponding hydraulic cylinder from the first left-position valve 24 and the second left-position valve 25 through the valve core groove 62 and the oil delivery groove 63. The return oil valve 26 controls the return oil, and the return oil flows back to the hydraulic pump from the second oil delivery valve 23 through the valve core groove 62 and the oil delivery groove 63, thereby controlling the hydraulic cylinder corresponding to the first left-position valve 24 and the second left-position valve 25. When it is necessary to control the hydraulic cylinder connected to the first right-position valve 27 and the second right-position valve 28, the drive rod 41 can be operated in reverse.

[0061] When only the first left-position valve 24 is needed to deliver oil, the oil delivery valve 51 is adjusted to control the oil inlet, and the liquid oil flows into the corresponding left-position extrusion block 53 through the main flow pipe 52 corresponding to the second left-position valve 25. The left-position extrusion block 53 presses down against the pressure seat 433 to squeeze the sliding throttling block 431 downward, so that the diverter groove 432 at the bottom of the sliding throttling block 431 contacts the diverter block 64, closing the second left-position valve 25, so that only the first left-position valve 24 delivers oil.

[0062] When it is necessary to control the flow of the first left-position valve 24, while closing the second left-position valve 25, the oil delivery valve 51 is adjusted to control the oil inlet, and the liquid oil flows into the corresponding left-position extrusion block 53 through the main flow pipe 52 corresponding to the first left-position valve 24. The left-position extrusion block 53 presses down against the pressure seat 433 to squeeze the sliding throttle block 431 downward, and the flow is controlled by the space between the bottom of the sliding throttle block 431 and the corresponding oil delivery groove 63, thereby controlling the flow of the first left-position valve 24.

[0063] The driving rod 41 can be used to drive the movement of the left valve core 42, the sliding throttling block 431, the middle valve core 44 and the right valve core 45 to control the flow direction of the liquid oil, and the downward pressing closing position valve of the left extrusion block 53 and the right extrusion block 55 can be used to control the flow path of the liquid oil. The flow of a single position valve can be controlled by the space between the bottom of the sliding throttling block 431 and the corresponding oil delivery groove 63. In this way, multiple valves can be compactly arranged together to achieve the effect of improving system integration and reliability.

[0064] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A hydraulic valve for an underground scraper, comprising a front cover (1), a rear cover (3) arranged on one side of the front cover (1), a valve body assembly (2) fixedly mounted between the front cover (1) and the rear cover (3), an inner tank assembly (6) arranged inside the front cover (1), the valve body assembly (2) and the rear cover (3), a valve core mechanism (4) movably mounted inside the inner tank assembly (6), and an adjusting assembly (5) movably mounted inside the valve body assembly (2), characterized in that: The valve body assembly (2) comprises a valve body shell (21) fixedly mounted between the front cover (1) and the rear cover (3); the inner groove assembly (6) comprises a sliding groove (61) and a valve core groove (62) opened inside the front cover (1), the valve body shell (21) and the rear cover (3); the valve core mechanism (4) comprises a driving rod (41) slidably connected to the inner wall of the sliding groove (61); and the outer wall of the driving rod (41) is movably connected to a plurality of throttling assemblies (43); The throttling assembly (43) comprises a sliding throttling block (431) slidably connected to the inner wall of the valve core groove (62); a limiting groove (434) is provided on the inner wall of the sliding throttling block (431); a return spring (435) is arranged inside the limiting groove (434); two ends of the return spring (435) are respectively fixedly connected to the sliding throttling block (431) and the inner wall of the driving rod (41); a diverter groove (432) is provided at the bottom of the sliding throttling block (431); and a pressure seat (433) is fixedly connected to the top of the sliding throttling block (431); The valve core mechanism (4) further comprises a left valve core (42), a middle valve core (44) and a right valve core (45) which are slidably connected to the inner wall of the valve core groove (62); the middle valve core (44) is arranged between the left valve core (42) and the right valve core (45); both sides of the middle valve core (44) are slidably connected to a sliding throttling block (431) between the left valve core (42) and the right valve core (45); and the outer walls of the left valve core (42), the middle valve core (44) and the right valve core (45) are all fixedly mounted with sealing rings (46); The regulating assembly (5) comprises a regulating oil delivery valve (51) fixedly mounted on the outer wall of the valve body housing (21); the bottom of the regulating oil delivery valve (51) is fixedly connected to two main flow pipes (52); the outer walls of the two main flow pipes (52) are both slidably connected to a left-position extrusion block (53); The outer wall of the main flow pipe (52) is fixedly connected to an auxiliary flow pipe (54) that penetrates the interior of the valve body shell (21), and the outer walls of the two auxiliary flow pipes (54) are both slidably connected to a right-position extrusion block (55).

2. The hydraulic valve for underground scraper according to claim 1, characterized in that: The inner tank assembly (6) further comprises a plurality of oil delivery tanks (63) disposed inside the valve body shell (21); the plurality of oil delivery tanks (63) are all in communication with the valve core tank (62); two of the oil delivery tanks (63) that are farthest from each other are both fixedly connected with a diverter block (64); and the outer wall of the diverter block (64) overlaps the inner wall of the diverter tank (432).

3. The hydraulic valve for underground scraper according to claim 2, characterized in that: A first oil delivery valve (22), an oil return valve (26) and a second oil delivery valve (23) are fixedly mounted on the outer wall of the valve body shell (21); the first oil delivery valve (22), the oil return valve (26) and the second oil delivery valve (23) are respectively connected to three oil delivery grooves (63) at the middle position.

4. The hydraulic valve for underground scraper according to claim 3, characterized in that: A first left-position valve (24) and a second left-position valve (25) are fixedly mounted on the outer wall of the valve body housing (21) close to the front cover (1), and the first left-position valve (24) and the second left-position valve (25) are both connected to the oil delivery groove (63) close to the front cover (1).

5. The hydraulic valve for underground scraper according to claim 4, characterized in that: A first right-position valve (27) and a second right-position valve (28) are fixedly mounted on an outer wall of the valve body housing (21) close to the rear cover (3), and the first right-position valve (27) and the second right-position valve (28) are both connected to an oil delivery groove (63) close to the rear cover (3).

6. The hydraulic valve for underground scraper according to claim 1, characterized in that: The left extrusion block (53) and the right extrusion block (55) are both slidably connected to the inner wall of the valve body shell (21), and an extrusion spring (56) is fixedly connected between the inner walls of the left extrusion block (53) and the right extrusion block (55) and the inner wall of the valve body shell (21).

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