A hydraulic control system for a tunnel drilling rig

Abstract

The present invention discloses a hydraulic control system for a tunnel drilling rig, comprising an oil tank, which is connected to a first multi-way valve and a second multi-way valve via a first hydraulic pump and a second hydraulic pump, respectively. The first multi-way valve includes two first, third, and fourth-way manual reversing valves for connecting the drilling rig's rotary motor and the push-pull cylinder, respectively. The second multi-way valve includes four second, third, and fourth-way manual reversing valves for connecting the push-pull cylinder, the chuck cylinder, the clamp, and the winch motor, respectively. The output power of the first hydraulic pump is greater than the output power of the second hydraulic pump. The hydraulic control system of the tunnel drilling rig has a simple oil circuit, is easy to operate, and facilitates troubleshooting. The push-pull cylinder, the chuck cylinder, and the clamp are controlled by the second multi-way valve, reducing the system size and weight. In addition, the first hydraulic pump drives the propulsion cylinder during drilling and lowering to ensure drilling efficiency. During drilling, the second hydraulic pump drives the propulsion cylinder to ensure appropriate propulsion pressure, facilitating precise control.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling rig hydraulic control systems, in particular to a hydraulic control system for a tunnel drilling rig. Background Art

[0002] A tunnel drilling rig is a drilling rig used in underground tunnels, primarily for deep-dig exploration, gas extraction, drainage, and ventilation projects. Its main structure is as follows: a power head equipped with a hydraulic chuck is connected to a feed cylinder. The clamp consists of two semicircular slips: one fixed and the other movable. A disc spring presses the two slips together. Its operation is as follows: the multi-way valve's transmission handle is reversed, the power head rotates, causing the hydraulic chuck to rotate the drill rod. The two slips in the water-passing clamp open, releasing the drill rod. The push handle is then reversed, and the power head advances under the action of the push-pull cylinder to drill. After driving a drill rod, the push handle returns to center, stopping the power head's advance. The rotary handle returns to center, stopping the power head's rotation, and the two slips in the clamp clamp securely hold the drill rod to prevent it from falling. Add another drill rod to the center of the drill pipe, pull the push handle back and reverse the direction, loosen the hydraulic chuck, and retract the power head to the tail. The drilling cycle continues by adding drill rods. The clamping and opening of the chuck and the clamp are controlled by the control valve group.

[0003] However, the hydraulic control systems of the above-mentioned tunnel drilling rigs are mostly linkage systems, which are not only cumbersome to operate, but also require different handle combinations to complete a set of actions. Therefore, they are not easy to use, resulting in a complex hydraulic system, a high failure rate, and poor durability. When a failure occurs, it is difficult to troubleshoot, which brings trouble to the maintenance of the hydraulic control system; in addition, in the hydraulic control system control of the prior art, the speed of the drill bit is controlled by a separate drive source, resulting in a constant drilling speed of the drill bit during operation of the drilling rig. The speed is too high, which is beneficial to improving drilling efficiency, but it is difficult to control the drilling depth during drilling. The speed is too low, which can control the stable progress of drilling, but is not conducive to efficient drilling and drilling, affecting work efficiency; moreover, the existing hydraulic control system is too large and heavy, which is not conducive to the transportation and movement of the drilling rig.

[0004] Therefore, it is necessary to improve the hydraulic control system of the tunnel drilling rig in the prior art. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects in the prior art and provide a hydraulic control system for a tunnel drilling rig that has a simple oil circuit, is easy to operate, troubleshoot and maintain, has high stability and good durability, can adjust the speed according to different working conditions, and reduces weight and volume.

[0006] In order to solve the above technical problems, the present invention discloses a hydraulic control system of a tunnel drilling rig, including an oil tank, wherein the oil tank is respectively connected to a first multi-way valve and a second multi-way valve through a first hydraulic pump and a second hydraulic pump, the first multi-way valve having a first oil return port connected to the oil tank, and the second multi-way valve having a second oil return port connected to the oil tank; the first multi-way valve includes two first three-position four-way manual reversing valves that are sequentially single-acting and respectively used to connect the drilling rig rotary motor and the push-pull cylinder; the second multi-way valve includes four second three-position four-way manual reversing valves that are respectively used to connect the push-pull cylinder, the chuck cylinder, the clamp and the winch motor, among the four second three-position four-way manual reversing valves, the three second three-position four-way manual reversing valves corresponding to the push-pull cylinder, the chuck cylinder and the clamp are connected in series, and are sequentially single-actingly connected to the remaining second three-position four-way manual reversing valves; the output power of the first hydraulic pump is greater than the output power of the second hydraulic pump.

[0007] In the tunnel drilling rig hydraulic control system in the above technical solution, the two first-position four-way manual reversing valves in the first multi-way valve are used to control the operating conditions of the drilling rig rotary motor and the push-pull cylinder, respectively, and the four second-position four-way manual reversing valves in the second multi-way valve are used to control the push-pull cylinder, chuck cylinder, clamping cylinder and winch motor, respectively. Therefore, compared with the hydraulic control system of the prior art, the control system has a simple oil circuit, and controls the drilling rig rotary motor, push-pull cylinder, chuck cylinder, clamping cylinder and winch motor through different first-position four-way manual reversing valves and second-position four-way manual reversing valves. Not only is the failure rate low, ensuring the durability of the control system, but it is also easy to troubleshoot and facilitates maintenance of the hydraulic system by staff.

[0008] During geological coring drilling, the drill rig's rotary motor drives the power head chuck to rotate, and the chuck drives the drill bit to rotate at high speed through the drill pipe, thereby achieving the purpose of grinding the rock. Since rotation is the most important and power-consuming action, it is controlled by the first hydraulic pump with greater output power to speed up the drilling and lowering speeds, thereby improving drilling efficiency. Since the drilling and lowering actions do not need to be performed at the same time, the two first three-position four-way manual reversing valves are connected in a sequential single-action manner, so that only one of the drilling rig's rotary motor and the push-pull cylinder moves at the same time.

[0009] When the tunnel drilling rig is drilling, since the oil circuits of the push-pull cylinder, chuck cylinder and clamp do not form a loop, the above three are controlled simultaneously through the second multi-way valve. While ensuring that the pressure source of the push-pull cylinder is stable at the highest value, the three share a pressure source, which can effectively reduce the volume and weight of the hydraulic system, thereby facilitating the transportation and movement of the equipment; in addition, the drill rod does not need to maintain a high speed of pulling out and drilling in the process of drilling, so at this time the second hydraulic pump is controlled by one of the second three-position four-way manual reversing valves to ensure the appropriate drilling pressure force, which is convenient for controlling the drilling depth; the drawworks motor is controlled separately because the function of the drawworks is to coring. During the coring process, the power head must stop rotating and drilling must also stop, that is, the coring action is an independent action. Therefore, in the second multi-way valve, the three second and third four-way manual reversing valves are respectively connected to the push-pull cylinder, the chuck cylinder and the clamper, and the three are connected in series, while the remaining second and third four-way manual reversing valve is connected to the above three second and third four-way manual reversing valves in a sequential single-action manner, thereby realizing the separate control of the drawworks motor.

[0010] Preferably, the first multi-way valve and the second multi-way valve are connected to the push-pull cylinder through a reversing valve, and the reversing valve has two working oil outlets connected to the push-pull cylinder to form a push-pull control pipeline, a first control oil inlet and a first control oil outlet connected to the first multi-way valve, and a second control oil inlet and a second control oil outlet connected to the second multi-way valve.

[0011] By adopting the above technical solution, the reversing valve is used to conveniently switch between the first multi-way valve and the second multi-way valve, so that the first hydraulic pump or the second hydraulic pump controls the push-pull cylinder, and the switching operation is more convenient. In addition, in the above tunnel drilling rig hydraulic control system, one of the first three-position four-way manual reversing valves and one of the second three-position four-way manual reversing valves are connected to the push-pull cylinder, and the first three-position four-way manual reversing valve and the second three-position four-way manual reversing valve are respectively connected to the first hydraulic pump and the second hydraulic pump, and the output feed of the first hydraulic pump is greater than the output power of the second hydraulic pump. In this way, different usage requirements are met. When pulling out and drilling down, the first multi-way valve is used to connect the first hydraulic pump to the push-pull cylinder, thereby increasing pressure and improving drilling efficiency. When drilling, the reversing valve is operated to connect the second hydraulic pump to the push-pull cylinder, thereby reducing propulsion pressure and accurately controlling drilling depth.

[0012] Preferably, the first multi-way valve has a first oil inlet connected to the oil tank, and a first oil inlet overflow valve is arranged between the first oil inlet and the first oil return port; the second multi-way valve has a second oil inlet connected to the oil tank, and a second oil inlet overflow valve is arranged between the second oil inlet and the second oil return port.

[0013] By adopting the above technical solution, the pressure oil flows out of the first hydraulic pump and enters the first multi-way valve before entering the first oil inlet relief valve, which effectively protects the outlet pressure of the first oil return port of the first multi-way valve from exceeding the allowable pressure; similarly, the second oil inlet relief valve can protect the outlet pressure of the second oil return port of the second multi-way valve from exceeding the allowable pressure.

[0014] Preferably, a first oil inlet pressure gauge is provided at the inlet of the first oil inlet relief valve, and a second oil inlet pressure gauge is provided at the inlet of the second oil inlet relief valve.

[0015] By adopting the above technical solution, the first oil inlet pressure gauge and the second oil inlet pressure gauge are used to conveniently monitor the oil inlet pressure at the first oil inlet port of the first reversing valve and the oil inlet pressure at the second oil inlet port of the second reversing valve. The displayed pressure oil pressure value is indicated by the gauge needle, which is convenient for the operator to determine the pressure status and perform corresponding operations.

[0016] Preferably, a first oil inlet filter is provided at the front end of the first hydraulic pump, and a second oil inlet filter is provided at the front end of the second hydraulic pump.

[0017] By adopting the above technical solution, the hydraulic oil entering the first hydraulic pump and the second hydraulic pump can be filtered respectively by the first oil inlet filter and the second oil inlet filter to ensure the cleanliness of the oil and prevent foreign particles in the oil from mixing into the first hydraulic pump and the second hydraulic pump and contaminating the entire oil control system. In this way, by reducing the pollution to the hydraulic system, the failure rate of the control system is reduced, the service life is extended, and the working efficiency of the drilling rig is improved.

[0018] Preferably, a first cooler is provided between the first oil return port and the oil tank, and a second cooler is provided between the second oil return port and the oil tank.

[0019] By adopting the above technical solution, the first cooler and the second cooler are used to cool the pressure oil returning to the oil tank to take away the heat in the pressure oil, so that the pressure oil is restored to the initial operating temperature, ensuring that the pressure oil temperature in the oil tank remains constant. In this way, the viscosity of the hydraulic oil is increased, its leakage is reduced, and the control system operation is made more stable and reliable while ensuring its service life.

[0020] Preferably, a first oil outlet filter is provided between the first cooler and the oil tank, and a second oil outlet filter is provided between the second cooler and the oil tank.

[0021] By adopting the above technical solution, the first oil outlet filter and the second oil outlet filter are used to filter the pressure oil before it returns to the oil tank, intercepting the impurity particles inside it, ensuring that clean pressure oil enters the oil tank, so as to maintain stable and normal operation of the system.

[0022] Preferably, the winch control pipeline is provided with a stop valve.

[0023] By adopting the above technical solution, under specific working conditions, after closing the stop valve, the oil circuit can be cut off, ensuring that the winch-driven salvage device hovers at a specified position to meet different usage needs.

[0024] Preferably, a second oil supply overflow valve is provided between the second hydraulic pump and the second multi-way valve.

[0025] By adopting the above technical solution, the pressure oil flows out of the second hydraulic pump and enters the second oil supply overflow valve before entering the second multi-way valve, effectively limiting the inlet pressure of the second oil inlet of the second multi-way valve to exceed the allowable pressure, thereby ensuring the stable operation of the second multi-way valve.

[0026] Preferably, a second oil supply pressure gauge is provided at the inlet of the second oil supply relief valve.

[0027] By adopting the above technical solution, the second oil supply pressure gauge is used to detect the pressure value at the second oil inlet of the second multi-way valve, which makes it convenient for staff to observe the oil supply pressure and perform corresponding operations.

[0028] To sum up, compared with the prior art, the hydraulic control system of the tunnel drilling rig of the present invention has a simple oil circuit, is easy to operate, has a low failure rate, high durability, and is convenient for troubleshooting and maintenance. The push-pull cylinder, chuck cylinder and clamp are controlled by the second multi-way valve to work simultaneously, so that the three share a pressure source, reducing the volume and weight of the hydraulic system; in addition, the propulsion cylinder is driven by the first hydraulic pump when pulling out and drilling down to ensure drilling efficiency, and the propulsion cylinder is driven by the second hydraulic pump during the drilling process to ensure appropriate propulsion pressure, which is convenient for precise control. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a structural diagram of Example 1;

[0030] Figure 2 This is a schematic structural diagram of the first multi-way valve in Example 1;

[0031] Figure 3 This is a schematic structural diagram of the second multi-way valve in Example 1;

[0032] Figure 4 1 is a schematic structural diagram of the reversing valve in accordance with embodiment 1;

[0033] Figure 5 is a schematic structural diagram of Example 2;

[0034] Figure 6 2 is a schematic diagram of the connection structure between the second reversing valve and the oil tank of Example 2;

[0035] In the figure: 100. Fuel tank; 200. First hydraulic pump; 300. First multi-way valve, 301. First oil inlet, 302. First oil return port, 303. Drilling rig working oil port A, 304. Drilling rig working oil port B, 305. First push-pull working oil port A, 306. First push-pull working oil port B; 400. Second hydraulic pump; 500. Second multi-way valve, 501. Second oil inlet, 502. Second oil return port 503. Second push-pull working oil port A, 504. Second push-pull working oil port B, 505. Chuck working oil port A, 506. Chuck working oil port B, 507. Winch working oil port A, 508. Winch working oil port B, 509. Clamping working oil port, 510. Clamping sealing oil port; 600. Drilling rig rotary motor; 700. Push-pull cylinder; 800. Chuck cylinder; 900. Winch motor; 110 . Clamp; 120. Reversing valve, 121. Working oil outlet A, 122. Working oil outlet B, 123. First control oil inlet, 124. First control oil outlet, 125. Second control oil inlet, 126. Second control oil outlet; 130. First oil inlet relief valve; 140. Second oil inlet relief valve; 150. First oil inlet pressure gauge; 160. Second oil inlet pressure gauge; 170. First oil inlet filter; 180. Second oil inlet filter; 190. First cooler; 210. Second cooler; 220. First oil outlet filter; 230. Second oil outlet filter; 240. Stop valve; 250. Second oil supply relief valve; 260. Second oil supply pressure gauge; 270. Push-pull relief valve; 280. Pressure reducing valve; 290. First three-position four-way manual reversing valve; 310. Second three-position four-way manual reversing valve. DETAILED DESCRIPTION

[0036] The following embodiments are further described in conjunction with the accompanying drawings and examples. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0037] Example 1

[0038] like Figure 1-Figure 4 As shown, the hydraulic control system of the tunnel drilling rig of Example 1 includes an oil tank 100, which is connected to a first multi-way valve 300 through a first hydraulic pump 200 and to a second multi-way valve 500 through a second hydraulic pump 400. The output power of the first hydraulic pump 200 is greater than the output power of the second hydraulic pump 400.

[0039] Specifically, the first multi-way valve 300 includes two first, third, and fourth-way manual reversing valves 290 connected in a sequential, single-acting manner. The two first, third, and fourth-way manual reversing valves 290 are respectively connected to the drilling rig rotary motor 600 and the push-pull cylinder 700. The oil inlets of the two first, third, and fourth-way manual reversing valves 290 form a first oil inlet 301 connected to the first hydraulic pump 200, and the oil return ports form a first oil return port 302 connected to the oil tank 100. Of the two first, third, and fourth-way manual reversing valves 290, the two working oil ports of one first, third, and fourth-way manual reversing valve 290 are drilling rig working oil ports A 303 and B 304 of the first multi-way valve 300, respectively. The two working oil ports of the other first, third, and fourth-way manual reversing valve 290 are first push-pull working oil ports A 305 and B 306. The drilling rig working oil port A303 and the drilling rig working oil port B304 are connected to the drilling rig rotary motor 600 to form a drilling rig control pipeline, and the first push-pull working oil port A305 and the first push-pull working oil port B306 are connected to the push-pull working cylinder 700 to form a first push-pull control pipeline.

[0040] After the first multi-way valve 300 adopts the above structure, during the operation of the tunnel drilling rig, the pressure oil in the oil tank 100 is extracted by the first hydraulic pump 200 and delivered to the first multi-way valve 300. The staff operates and controls the two first three-position four-way manual reversing valves 290 of the first multi-way valve 300 according to current needs. One of the first three-position four-way manual reversing valves 290 is used to control the rotation of the drilling rig rotary motor 600, and the other first three-position four-way manual reversing valve 290 is used to control the push-pull cylinder 700 to realize the pushing and pulling of the drill rod.

[0041] Since the geological coring drilling method relies on the drill rod driving the drill bit to rotate at high speed, thereby achieving the purpose of grinding the rock, and the drill rod is driven by the drill rig rotary motor 600, which drives the power head chuck to rotate, and the chuck drives the drill rod. Rotation is the most important action and consumes the most power during drilling. Therefore, a first hydraulic pump 200 with a larger output power is used to drive the drill rig rotary motor 600 to rotate at high speed through the first multi-way valve 300 to improve drilling efficiency. Since the two actions of pulling out and drilling down do not need to be performed simultaneously during the drilling process, the two first three-position four-way manual reversing valves 290 connected to the drill rig rotary motor 600 and the push-pull cylinder 700 adopt a sequential single-acting connection method, that is, only one of the drill rig rotary motor 600 and the push-pull cylinder 700 can be activated at a time, and the actuators can work at their maximum capacity, thereby ensuring high drilling efficiency.

[0042] The second multi-way valve 500 includes four second three-position four-way manual reversing valves 310. The oil inlets of the four second three-position four-way manual reversing valves 310 form a second oil inlet 501 of the second multi-way valve 500. The second oil inlet 501 is connected to the second hydraulic pump 400. The oil return ports of the four second three-position four-way manual reversing valves 310 form a second oil return port 502 of the second multi-way valve 500. The second oil return port 502 is connected to the oil tank 100. The connection method of the four second three-position four-way manual reversing valves 310 and the specific structure of the working oil ports are as follows:

[0043] Among the four second three-position four-way manual reversing valves 310, three of them are connected in series and are respectively connected to the push-pull cylinder 700, the chuck cylinder 800 and the clamp 110. The working oil ports of the three second three-position four-way manual reversing valves 310 are the second push-pull working oil port A503, the second push-pull working oil port B504, the chuck working oil port A505, the chuck working oil port B506, the clamping working oil port 509 and the clamping closing oil port 510. The second push-pull working oil port A503 and the second push-pull working oil port B504 are connected to the push-pull cylinder 700 to form a second push-pull control pipeline. The chuck working oil port A505 and the chuck working oil port The working oil port B506 is connected to the chuck cylinder 800 to form a chuck control pipeline, the clamping working oil port 509 is connected to the clamper 110, sharing an oil circuit, and the clamping closing oil port 510 is blocked; the remaining second three-position four-way manual reversing valve 310 is connected to the above three second three-position four-way manual reversing valves 310 in sequence, and the two working oil ports of the remaining second three-position four-way manual reversing valve 310 respectively form the winch working oil port A507 and the winch working oil port B508 of the second multi-way valve 500, and the winch working oil port A507 and the winch working oil port B508 are connected to the winch motor 900 to form a winch control pipeline.

[0044] In the second multi-way valve 500, the three second three-position four-way manual reversing valves 310 connected to the push-pull cylinder 700, the chuck cylinder 800 and the clamp 110 are connected in series. When the drilling rig performs the drilling operation, the pressure oil in the oil tank 100 is delivered to the second multi-way valve 500 through the second hydraulic pump 400, and at the same time, it is delivered to the push-pull cylinder 700, the chuck cylinder 800 and the clamp 110 through the above three second three-position four-way manual reversing valves 310, driving the above three to act simultaneously, and the chuck cylinder 800 and the clamp 110 are driven to move simultaneously. The oil circuits 10 form a loop to ensure that the pressure source of the push-pull cylinder is stable at the highest value. This design shares a pressure source, which can effectively reduce the volume and weight of the hydraulic system and ensure precise control of the drilling of the push-pull cylinder 700 during drilling; and the remaining second, third, four-way manual reversing valve 310 connected to the drawworks motor 900 and the above three second, third, four-way manual reversing valves 310 adopt a sequential single-action connection method, so that the system can independently control the coring operation of the drilling rig to ensure that when coring, the power head stops rotating and drilling stops at the same time.

[0045] Compared with the linked hydraulic control system in the prior art, in this embodiment, the two first three-position four-way manual reversing valves 290 in the first multi-way valve 300 and the four second three-way manual reversing valves 310 in the second multi-way valve 500 are used to control the actions of the drilling rig rotary motor 600, push-pull cylinder 700, chuck cylinder 800 and winch motor 900 during the drilling, drilling and drilling processes. The oil circuit is simple and the stability is high. Each action is equipped with a corresponding operating lever, and there is no need to control different actions through linkage. Therefore, it is easy to use and convenient to operate. Not only that, when the control system fails, it is convenient to troubleshoot and repair.

[0046] The first multi-way valve 300 and the second multi-way valve 500 are connected to the push-pull cylinder 700 through the reversing valve 120, and the switching connection between the first multi-way valve 300 and the second multi-way valve 500 and the push-pull cylinder 700 is realized through the reversing valve 120. Specifically, the reversing valve 120 has a working oil outlet A121 and a working oil outlet B122, and the working oil outlet A121 and the working oil outlet B122 are connected to the push-pull cylinder 700 to form a push-pull control pipeline; the reversing valve 120 also has a first control oil inlet 123, a first control oil outlet 124, a second control oil inlet 125 and a second control oil outlet 126, wherein the first control oil inlet 123 and the first control oil outlet 124 are respectively connected to the second push-pull working oil port B504 and the second push-pull working oil port A503, and the second control oil inlet 125 and the second control oil outlet 126 are respectively connected to the second push-pull working oil port B504 and the second push-pull working oil port A503.

[0047] With the above structure, the reversing valve 120 facilitates switching between the first multi-way valve 300 and the second multi-way valve 500, selecting one of the two for connection to the push-pull cylinder 700. Specifically, during drilling and teeing, the operator controls the reversing valve 120 to select the first multi-way valve 300 for connection to the push-pull cylinder 700. The first hydraulic pump 200, with its higher output power, drives the push-pull cylinder 700, ensuring sufficient output force from the push-pull cylinder 700 and improving drilling efficiency. During drilling, the operator controls the reversing valve 120 to select the second multi-way valve 500 for connection to the push-pull cylinder 700. The second hydraulic pump 400, with its lower output power, drives the push-pull cylinder 700, ensuring appropriate drilling pressure and facilitating control. A push-pull relief valve 270 connects the working oil outlet B122 to the rodless chamber of the push-pull cylinder 700 to control the hydraulic oil pressure in the pipeline between the two within an appropriate range and prevent excessive oil pressure.

[0048] A first oil inlet relief valve 130 is installed between the first oil inlet 301 and the first oil return port 302, and a second oil inlet relief valve 140 is installed between the second oil inlet 501 and the second oil return port 502. A first oil inlet pressure gauge 150 is installed at the inlet of the first oil inlet relief valve 130, and a second oil inlet pressure gauge 160 is installed at the inlet of the second oil inlet relief valve 140. A first oil inlet filter 170 is installed at the front end of the first hydraulic pump 200, and a second oil inlet filter 180 is installed at the front end of the second hydraulic pump 400.

[0049] After adopting the above design, the first oil inlet relief valve 130 and the second oil inlet relief valve 140 respectively limit and control the outlet pressure of the first oil return port 302 of the first multi-way valve 300 and the outlet pressure of the second oil return port 502 of the second multi-way valve 500, thereby ensuring that the hydraulic pressure of the pressure oil does not exceed the allowable pressure; and the first oil inlet pressure gauge 150 and the second oil inlet pressure gauge 160 are used to facilitate the staff to understand the oil pressure and perform related operations based on the oil pressure of the pressure oil.

[0050] Example 2

[0051] like Figure 5 and Figure 6 As shown, the hydraulic control system of the tunnel drilling rig of Example 2 is based on Example 1, with the following differences:

[0052] (1) A first cooler 190 is provided between the first oil return port 302 and the fuel tank 100, and a second cooler 210 is provided between the second oil return port 502 and the fuel tank 100;

[0053] (2) A first oil outlet filter 220 is provided between the first cooler 190 and the oil tank 100 , and a second oil outlet filter 230 is provided between the second cooler 210 and the oil tank 100 ;

[0054] (3) A second oil supply relief valve 250 is provided between the second hydraulic pump 400 and the second multi-way valve 500 , and a second oil supply pressure gauge 260 is provided at the inlet of the second oil supply relief valve 250 ;

[0055] (4) A stop valve 240 is provided between the winch working oil port A507 and the winch motor 900;

[0056] (5) A pressure reducing valve 280 is provided between the second push-pull working oil port B504 and the second control oil inlet 125 .

[0057] By setting up a first cooler 190 and a second cooler 210, the pressure oil flowing into the oil tank 100 from the first return oil port 302 and the pressure oil flowing into the oil tank 100 from the second return oil port 502 are cooled and taken away, so as to avoid the pressure oil being at high temperature for a long time, which leads to a decrease in viscosity, a decrease in the sealing performance of the hydraulic system, and a shortening of the service life. Therefore, by cooling the pressure oil returning to the oil tank 100 through the first cooler 190 and the second cooler 210, the operation of the hydraulic control system can be ensured to be more stable and reliable.

[0058] The pressure oil returning to the oil tank 100 is filtered by the first oil outlet filter 220 and the second oil outlet filter 230 to isolate the particulate impurities in the pressure oil and prevent these particulate impurities from flowing with the oil in the system and causing wear on the equipment. In this way, by filtering the oil, the stable operation and service life of the system are guaranteed.

[0059] The second oil supply overflow valve 250 between the second hydraulic pump 400 and the second multi-way valve 500 limits the pressure of the hydraulic oil entering the second multi-way valve 500 so that it is controlled within the allowable range, and cooperates with the second oil supply pressure gauge 260 to detect the pressure of the hydraulic oil entering the second multi-way valve 500, so as to facilitate operators to perform corresponding operations according to the pressure value.

[0060] The setting of the stop valve 240 can control the on-off status between the winch working oil port A507 and the winch motor 900. Under specific working conditions, closing the stop valve 240 can cut off the oil circuit between the winch working oil port A507 and the winch motor 900, ensuring that the salvage vehicle driven by the salvage vehicle hovers at the specified position.

[0061] The setting of the pressure reducing valve 280 can adjust the oil pressure between the second push-pull working oil port B504 and the second control oil inlet 125 to an appropriate pressure range, reduce the propulsion pressure of the push-pull cylinder 700, and avoid excessive speed during drilling, thus facilitating and accurately controlling the degree of drilling.

[0062] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A hydraulic control system for a tunnel drilling rig, comprising an oil tank (100), characterized in that: The oil tank (100) is connected to a first multi-way valve (300) and a second multi-way valve (500) via a first hydraulic pump (200) and a second hydraulic pump (400), respectively. The first multi-way valve (300) has a first oil return port (302) in communication with the oil tank (100), and the second multi-way valve (500) has a second oil return port (502) in communication with the oil tank (100). The first multi-way valve (300) comprises two first three-position four-way manual reversing valves (290) which are sequentially connected in single action and are used to connect the drilling rig rotary motor (600) and the push-pull oil cylinder (700) respectively; The second multi-way valve (500) includes four second three-position four-way manual reversing valves (310) respectively used to connect the push-pull cylinder (700), the chuck cylinder (800), the clamp (110) and the winch motor (900); among the four second three-position four-way manual reversing valves (310), three second three-position four-way manual reversing valves (310) corresponding to the push-pull cylinder (700), the chuck cylinder (800) and the clamp (110) are connected in series, and are sequentially connected to the remaining second three-position four-way manual reversing valves (310) in a single-action manner; The output power of the first hydraulic pump (200) is greater than the output power of the second hydraulic pump (400); the first multi-way valve (300) and the second multi-way valve (500) are connected to the push-pull cylinder (700) via a reversing valve (120); the reversing valve (120) has two working oil outlets (121; 122) connected to the push-pull cylinder (700) to form a push-pull control pipeline, a first control oil inlet (123) and a first control oil outlet (124) connected to the first multi-way valve (300), and a second control oil inlet (125) and a second control oil outlet (126) connected to the second multi-way valve (500).

2. The hydraulic control system of a tunnel drilling rig according to claim 1, characterized in that: The first multi-way valve (300) has a first oil inlet (301) connected to the oil tank (100), and a first oil inlet overflow valve (130) is provided between the first oil inlet (301) and the first oil return port (302). The second multi-way valve (500) has a second oil inlet (501) connected to the oil tank (100), and a second oil inlet overflow valve (140) is provided between the second oil inlet (501) and the second oil return port (502).

3. The hydraulic control system of a tunnel drilling rig according to claim 2, characterized in that: The inlet of the first oil inlet relief valve (130) is provided with a first oil inlet pressure gauge (150), and the inlet of the second oil inlet relief valve (140) is provided with a second oil inlet pressure gauge (160).

4. The hydraulic control system of a tunnel drilling rig according to claim 2, characterized in that: A first oil inlet filter (170) is provided at the front end of the first hydraulic pump (200), and a second oil inlet filter (180) is provided at the front end of the second hydraulic pump (400).

5. The hydraulic control system of a tunnel drilling rig according to claim 3, characterized in that: A first cooler (190) is provided between the first oil return port (302) and the oil tank (100), and a second cooler (210) is provided between the second oil return port (502) and the oil tank (100).

6. The hydraulic control system for a tunnel drilling rig according to claim 5, characterized in that: A first oil outlet filter (220) is provided between the first cooler (190) and the oil tank (100), and a second oil outlet filter (230) is provided between the second cooler (210) and the oil tank (100).

7. The hydraulic control system for a tunnel drilling rig according to claim 1, characterized in that: A stop valve (240) is provided between the winch motor (900) and the second multi-way valve (500).

8. The hydraulic control system for a tunnel drilling rig according to claim 1, characterized in that: A second oil supply overflow valve (250) is provided between the second hydraulic pump (400) and the second multi-way valve (500).

9. The hydraulic control system for a tunnel drilling rig according to claim 8, characterized in that: A second oil supply pressure gauge (260) is provided at the inlet of the second oil supply relief valve (250).

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