A multi-way valve for a tunnel drilling rig

Abstract

The present invention discloses a multi-way valve for a tunnel drilling rig, which includes a valve body. A large pump oil inlet, a small pump oil inlet and an oil return port are arranged on the valve body. A power head motor reversing valve connected between the large pump oil inlet and the oil return port and a push-pull oil cylinder reversing valve, a chuck oil cylinder reversing valve and a gripper reversing valve connected in series between the small pump oil inlet and the oil return port in sequence are arranged inside the valve body. A confluence assembly for confluencing the pressure oil flowing into the large pump oil inlet into the small pump oil inlet is also arranged inside the valve body. The multi-way valve for the tunnel drilling rig introduces the pressure oil at the large pump oil inlet into the small pump oil inlet through the confluence assembly inside the valve body to achieve confluence, and uses the power head motor reversing valve to select whether to perform confluence, so as to adjust the moving speed of the push-pull oil cylinder piston rod according to the working conditions, make the structure more compact to reduce the volume and weight, reduce the number of hydraulic components, and ensure the reliability of the operation of the multi-way valve assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of multi-way valves, and more particularly to a multi-way valve for a tunnel drilling rig. Background Art

[0002] A tunnel drilling rig is a drilling rig used in underground roadways, mainly for deep geological exploration, gas drainage, water injection and drainage, ventilation and other engineering constructions in roadways. Its main structure is: a power head equipped with a hydraulic chuck is connected to a feed oil cylinder. The gripper consists of two semi-circular jaws. One jaw is fixed and the other can move. Under the action of disc springs, the two jaws are pressed together. Its working mode is: the multi-way valve training handle is commutated, the power head rotates, the hydraulic chuck clamps the drill pipe and rotates, the two jaws of the water-through gripper open, the drill pipe is released, the push handle is pushed forward to commutate, and under the action of the push-pull oil cylinder, the power head advances for drilling; after drilling in one drill pipe, the push handle returns to the middle position, the power head stops advancing, the rotation handle returns to the middle position, the power head stops rotating, and the two jaws of the gripper clamp the drilled drill pipe to prevent it from falling. Another drill pipe is added to the middle of the drill pipe. The push handle is pulled backward to commutate, the hydraulic chuck is released, and the power head retreats to the tail. Drilling is cycled by continuously adding drill pipes. The clamping and opening of the chuck and the clamping and opening of the gripper are all controlled by the control valve housing.

[0003] In order to control the operation of the power head motor, push-pull oil cylinder, chuck oil cylinder and gripper, in the prior art, for example, a Chinese utility model patent with the publication number CN201763715U discloses a tunnel drilling rig integrated valve, which includes a shunt inlet valve group provided at one end and a return oil valve group provided at the other end. Between the shunt inlet valve group and the return oil valve group, a series-type overload commutation valve group, a common commutation valve group and a confluence commutation valve group are arranged in sequence from left to right; between each valve group, they are interconnected through parallel channels, middle position channels and low-pressure channels provided on the side and external pipelines to form a complete hydraulic control oil circuit, so as to achieve the technical effects of reducing the weight by 40%, increasing the working pressure by 50%, and increasing the allowable flow rate by 58%, significantly improving the performance of the tunnel drilling rig valve, and having a wide application range.

[0004] However, when using the above integrated valve to control the operation of the drilling rig, it does not have the function of integrated confluence. In order to achieve the switching effect of the fast and slow speed of the push-pull oil cylinder, usually a commutation valve needs to be set outside the integrated valve, and the pressure oil entering the above integrated valve is controlled by the commutation valve to achieve the function of speed switching. However, in this way, the number of external hydraulic components of the multi-way valve assembly for tunnel drilling is increased, resulting in an increase in the occupied space, the body structure of the system components being bulky, and at the same time, since the commutation valve is set outside the integrated valve, the possibility of being damaged is increased, the failure rate is higher, and the overall reliability of the multi-way valve assembly of the tunnel drilling rig is reduced.

[0005] Therefore, it is necessary to improve the multi-way valve for the tunnel drilling rig in the prior art. Summary of the Invention

[0006] The purpose of the present invention is to overcome the defects existing in the prior art, and to provide a multi-way valve for a tunnel drilling rig with a compact structure to reduce the occupied space, reduce the weight and improve the reliability.

[0007] To achieve the above technical effects, the technical solution of the present invention is: a multi-way valve for a tunnel drilling rig, including a valve body, a large pump inlet, a small pump inlet and an oil return port are arranged on the valve body, and a power head motor reversing valve connected between the large pump inlet and the oil return port and a push-pull oil cylinder reversing valve, a chuck oil cylinder reversing valve and a gripper reversing valve connected in series between the small pump inlet and the oil return port in sequence are arranged in the valve body; a confluence component for confluencing the pressure oil flowing into the large pump inlet into the small pump inlet is further arranged in the valve body.

[0008] In the multi-way valve assembly for the tunnel drilling rig of the above technical solution, the large pump inlet and the small pump inlet on the valve body are respectively used to connect two hydraulic pumps. The hydraulic pump (hereinafter referred to as "large pump") connected to the large pump inlet has an output power of 60 kw, and the hydraulic pump (hereinafter referred to as "small pump") connected to the small pump inlet generally has an output power of 12 kw, and the oil return port on the valve body is used to communicate with the fuel tank; the two control ports of the power head motor reversing valve are respectively a power head control port A and a power head control port B, which are respectively communicated with the two working chambers of the power head motor; similarly, the two control ports of the push-pull oil cylinder reversing valve are respectively a push-pull control port A and a push-pull control port B, which are respectively communicated with the rod chamber and the rodless chamber of the push-pull oil cylinder; the two control ports of the chuck oil cylinder reversing valve are respectively a chuck control port A and a chuck control port B, which are respectively communicated with the rod chamber and the rodless chamber of the chuck oil cylinder; the two control ports of the gripper reversing valve are respectively a gripper control port A and a gripper control port B, which are respectively communicated with the two working chambers of the gripper.

[0009] When the tunnel drilling rig is running, the large pump transports the pressure oil in the fuel tank to the large pump inlet, and the pressure oil enters the power head motor reversing valve to control the forward or reverse rotation of the power head motor. The pressure oil in the power head motor reversing valve flows into the fuel tank through the oil return port; since the push-pull oil cylinder reversing valve, the chuck oil cylinder reversing valve and the gripper reversing valve are connected in series, when the small pump is running, it transports the pressure oil in the fuel tank to the push-pull oil cylinder reversing valve, the chuck oil cylinder reversing valve and the gripper reversing valve at the same time to realize the combined actions of the push-pull oil cylinder, the chuck oil cylinder and the gripper; when the power head motor reversing valve does not need to use pressure oil, the pressure oil transported by the large pump to the large pump inlet is transported to the small pump inlet through the confluence component. At this time, the above pressure oil is confluent with the pressure oil at the small pump inlet and enters the push-pull oil cylinder reversing valve at the same time to control the forward and backward movement of the push-pull oil cylinder piston rod more quickly.

[0010] Compared with the prior art that a reversing valve is arranged outside the multi-way valve assembly, in the present invention, a confluence assembly is arranged inside the valve body to confluence the pressure oil transmitted by the large pump and the pressure oil transmitted by the small pump. On the basis of meeting the speed switching adjustment of the push-pull oil cylinder piston rod, the structure of the whole multi-way valve control system is more compact, occupies less space, shortens the pipeline connection length at the same time, reduces the overall weight of the multi-way valve, makes the integration degree higher, and because the confluence assembly is arranged inside the valve body, the stable operation of the confluence assembly is ensured, the reliability is improved, the confluence assembly is prevented from being damaged, and its stable operation is guaranteed to realize the fast and slow switching of the moving speed of the push-pull oil cylinder piston rod.

[0011] Preferably, the confluence assembly includes a confluence pipeline with two ends respectively communicated with the large pump oil inlet and the small pump oil inlet, and a check valve is arranged on the confluence pipeline.

[0012] Preferably, by adopting the above technical solution, the large pump oil inlet and the small pump oil inlet are communicated by using the confluence pipeline, and at the same time, the flow direction of the pressure oil in the confluence pipeline is restricted by the check valve on the confluence pipeline, so that the pressure oil can only flow from the large pump oil inlet to the small pump oil inlet to realize confluence, and the pressure oil entering from the small pump oil inlet is prevented from flowing to the large pump oil inlet.

[0013] Preferably, an overflow valve is arranged inside the valve body and is communicated between the large pump oil inlet and the oil return port to limit the oil inlet pressure of the large pump oil inlet.

[0014] By adopting the above technical solution, the oil inlet pressure of the large pump oil inlet is limited by using the overflow valve, so that the oil pressure inside the valve body is stabilized within the safe pressure range. When the pressure exceeds the set pressure of the overflow valve, the pressure oil exceeding the safe pressure part flows back to the oil tank through the oil return port. In this way, the safe and stable operation of the multi-way valve is ensured.

[0015] Preferably, a large pump pressure measuring port and a small pump pressure measuring port respectively communicated with the large pump oil inlet and the small pump oil inlet are arranged on the valve body, and the large pump pressure measuring port and the small pump pressure measuring port are respectively used for connecting a first hydraulic pressure gauge and a second hydraulic pump.

[0016] By adopting the above technical solution, the first hydraulic pump and the second hydraulic pump are respectively connected to the large pump pressure measuring port and the small pump pressure measuring port to detect the oil pressure of the pressure oil at the large pump oil inlet and the small pump oil inlet respectively, which is convenient for the operator to judge and then perform relevant operations.

[0017] Preferably, a first oil drain port and a second oil drain port respectively communicated with the outlet of the push-pull oil cylinder reversing valve and the outlet of the chuck oil cylinder reversing valve are further arranged on the valve body.

[0018] By adopting the above technical solution, the oil leakage of the remaining hydraulic control components is introduced into the multi-way valve through the first oil drain port and the second oil drain port, and after the oil leakage is combined, it flows back to the fuel tank, so that the structure of the multi-way valve is more compact and is conducive to saving space.

[0019] Preferably, the valve body includes a power head motor control valve housing, a push-pull oil cylinder control valve housing, a chuck oil cylinder control valve housing, and a gripper control valve housing connected in sequence. The power head motor reversing valve, the push-pull oil cylinder reversing valve, the chuck oil cylinder reversing valve, and the gripper reversing valve are respectively arranged on the power head motor control valve housing, the push-pull oil cylinder control valve housing, the chuck oil cylinder control valve housing, and the gripper control valve housing.

[0020] By adopting the above technical solution, the power head motor reversing valve, the push-pull oil cylinder reversing valve, the chuck oil cylinder reversing valve, and the gripper reversing valve are respectively arranged on the corresponding power head motor control valve housing, push-pull oil cylinder control valve housing, chuck oil cylinder control valve housing, and gripper control valve housing, which facilitates the assembly and production of the multi-way valve. At the same time, it is convenient to troubleshoot, so that after the multi-way valve fails, the hydraulic components causing the failure can be found in time, improving the maintenance work efficiency of the tunnel drilling rig.

[0021] Preferably, a large pump control valve housing is arranged on the side of the power head motor control valve housing facing away from the push-pull oil cylinder control valve housing, and a small pump control valve housing is arranged between the power head motor control valve housing and the push-pull oil cylinder control valve housing. The large pump oil inlet and the oil return port are arranged on the large pump control valve housing, and the small pump oil inlet is arranged on the small pump control valve housing.

[0022] By adopting the above technical solution, it is convenient for the assembly and production of the multi-way valve, and at the same time, it is convenient to troubleshoot the large pump oil inlet failure, small pump oil inlet failure, and oil return failure of the multi-way valve, so that the multi-way valve can operate safely and stably.

[0023] Preferably, the large pump control valve housing, the power head motor control valve housing, the small pump control valve housing, the push-pull oil cylinder control valve housing, the chuck oil cylinder control valve housing, and the gripper control valve housing are connected by double-headed screws and nuts threadedly engaged at both ends of the double-headed screws.

[0024] By adopting the above technical solution, it is convenient for the detachable connection between multiple hydraulic components of the valve body, facilitating the rapid assembly of the multi-way valve. At the same time, when some of the hydraulic components are damaged, they can be quickly replaced to ensure the normal and stable operation of tunnel drilling.

[0025] Preferably, the power head motor reversing valve, the push-pull oil cylinder reversing valve, the chuck oil cylinder reversing valve, and the gripper reversing valve are all three-way four-position reversing valves.

[0026] By adopting the above technical solution, it is convenient to operate the power head motor reversing valve, the push-pull oil cylinder reversing valve, the chuck oil cylinder reversing valve and the gripper reversing valve to achieve fast control.

[0027] Preferably, the valve body is provided with a first reserved port and a second reserved port which are respectively communicated with two power head control ports of the power head motor reversing valve.

[0028] By adopting the above technical solution, the first reserved port and the second reserved port are used to facilitate the subsequent upgrade operation of the hydraulic system, so as to connect other hydraulic components according to the requirements of the hydraulic control system on the basis of the original multi-way valve, and complete the connection of the hydraulic components and the multi-way valve.

[0029] In summary, compared with the prior art, the multi-way valve for the tunnel drilling rig of the present invention introduces the pressure oil at the large pump inlet into the small pump inlet through the confluence component in the valve body to achieve confluence, and uses the power head motor reversing valve to select whether to perform confluence, so as to adjust the moving speed of the piston rod of the push-pull oil cylinder according to the working conditions, making the structure more compact to reduce the volume and weight, reducing the number of hydraulic components, and ensuring the reliability of the operation of the multi-way valve assembly. Description of the Drawings

[0030] Figure 1 is the front view of the present invention;

[0031] Figure 2 is the front view of the present invention;

[0032] Figure 3 is the side view of the present invention;

[0033] Figure 4 is the oil circuit schematic diagram of the present invention;

[0034] In the figure: 100. Valve body, 101. Large pump inlet, 102. Small pump inlet, 103. Oil return port, 104. Large pump pressure measuring port, 105. Small pump pressure measuring port, 106. First drain port, 107. Second drain port, 108. First reserved port, 109. Second reserved port, 200. Power head motor reversing valve, 201. Power head control port A, 202. Power head control port B, 300. Chuck oil cylinder reversing valve, 301. Chuck control port A, 302. Chuck control port B, 400. Gripper reversing valve, 401. Gripper control port A, 402. Gripper control port B, 500. Confluence pipeline, 600. Check valve, 700. Relief valve, 800. Power head motor control valve housing, 900. Chuck oil cylinder control valve housing, 110. Gripper control valve housing, 120. Large pump control valve housing, 130. Small pump control valve housing, 140. Double-headed screw, 150. Nut, 160. Push-pull oil cylinder reversing valve, 161. Push-pull control port A, 162. Push-pull control port B, 170. Push-pull oil cylinder control valve housing. Specific embodiments

[0035] The following combines the accompanying drawings and embodiments to further describe the specific embodiments of the present invention. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and cannot be used to limit the protection scope of the present invention.

[0036] As Figures 1-4 shown, the multi-way valve for a tunnel drilling rig of the present invention includes a valve body 100. A large pump oil inlet 101, a small pump oil inlet 102, and an oil return port 103 are provided on the valve body 100. The large pump oil inlet 101 is used to connect to a hydraulic pump with an output power of 60 kw (hereinafter referred to as the "large pump"), the small pump oil inlet 102 is used to connect to a hydraulic pump with an output power of 12 kw (hereinafter referred to as the "small pump"), and the oil return port 103 is used to connect to the fuel tank. When this multi-way valve is in use, the large pump and the small pump respectively transport the pressurized oil in the fuel tank to the inside of the valve body 100 through the large pump oil inlet 101 and the small pump oil inlet 102, and the pressurized oil after use flows back to the fuel tank through the oil return port 103.

[0037] A power head motor reversing valve 200, a push-pull oil cylinder reversing valve 160, a chuck oil cylinder reversing valve 300, and a gripper reversing valve 400 are arranged inside the valve body 100. The power head motor reversing valve 200, the push-pull oil cylinder reversing valve 160, the chuck oil cylinder reversing valve 300, and the gripper reversing valve 400 are all three-way four-position reversing valves; among them, the push-pull oil cylinder reversing valve 160, the chuck oil cylinder reversing valve 300, and the gripper reversing valve 400 are connected in series to form a series pipeline, while the power head motor reversing valve 200 is connected in parallel with the above-mentioned series pipeline. The interface connection structures of the four three-way four-position reversing valves are specifically described as follows:

[0038] The inlet of the power head motor reversing valve 200 is communicated with the large pump oil inlet 101, the outlet is communicated with the oil return port 103, and the two control ports are respectively a power head control port A201 and a power head control port B202, which are respectively communicated with the two working chambers of the power head motor; the inlet of the push-pull oil cylinder reversing valve 160 is communicated with the small pump oil inlet 102, the outlet is communicated with the oil return port 103, and the two control ports are respectively a push-pull control port A161 and a push-pull control port B162, which are respectively communicated with the rod chamber and the rodless chamber of the push-pull oil cylinder; the oil inlet of the chuck oil cylinder reversing valve 300 is communicated with the small pump oil inlet 102, the outlet is communicated with the oil return port 103, and the two control ports are respectively a chuck control port A301 and a chuck control port B302, which are respectively communicated with the rod chamber and the rodless chamber of the chuck oil cylinder; the inlet of the gripper reversing valve 400 is communicated with the small pump oil inlet 102, the outlet is communicated with the oil return port 103, and the two control ports are respectively a gripper control port A401 and a gripper control port B402, which are respectively communicated with the two working chambers of the gripper.

[0039] A confluence component is also provided inside the valve body 100. The confluence component is used to confluence the pressure oil flowing into the large pump inlet 101 to the small pump inlet 102. The confluence component includes a confluence pipeline 500. The two ends of the confluence pipeline 500 are respectively communicated with the large pump inlet 101 and the small pump inlet 102. A check valve 600 is arranged on the confluence pipeline 500. The inlet of the check valve 600 is adjacent to the large pump inlet 101, and the outlet is adjacent to the small pump inlet 102.

[0040] When the multi-way valve for the tunnel drilling rig operates, the large pump transports the pressure oil in the fuel tank to the large pump inlet 101. The pressure oil at the large pump inlet 101 drives the power head motor to rotate forward or reverse through the power head control port A201 and the power head control port B202; the small pump transports the pressure oil in the fuel tank to the small pump inlet 102. The pressure oil drives the piston rod of the push-pull oil cylinder to move forward or backward through the push-pull control port A161 and the push-pull control port B162. Similarly, the pressure oil drives the piston rod of the chuck oil cylinder to move forward or backward through the chuck control port A301 and the chuck control port B302, and the pressure oil drives the gripper to act through the gripper control port A401 and the gripper control port B402. When the spool of the power head motor reversing valve 200 moves to the central position, that is, its inlet is communicated with its outlet and the power head control port A201 and the power head control port B202 are closed, the power head motor reversing valve 200 does not use the pressure oil at the large pump inlet 101 at this time. At this time, the large pump remains in the operating state. After the pressure oil in the fuel tank passes through the large pump inlet 101, it flows along the confluence pipeline 500. The check valve 600 is used to prevent the pressure oil from flowing backward or refluxing, so that the pressure oil entering from the large pump inlet 101 is confluent with the pressure oil at the small pump inlet 102, completing the confluence, and the piston rod of the push-pull oil cylinder can be controlled to move forward and backward more quickly through the push-pull control port A161 and the push-pull control port B162. Through the confluence of the pressure oil at the two places, the movement speed of the piston rod of the push-pull oil cylinder can be increased. Therefore, during the operation of the device, the power head motor reversing valve 200 can control whether the pressure oil at the large pump inlet 101 and the small pump inlet 102 is confluent, so as to control the movement speed of the piston rod of the push-pull oil cylinder, realize the switching between high speed and low speed, and meet the use requirements of different working conditions.

[0041] Compared with the structure and method of controlling confluence by setting a reversing valve outside the multi-way valve in the prior art to achieve speed switching, in the present invention, the pressure oil at the large pump inlet 101 and the pressure oil at the small pump inlet 102 are confluenced through a confluence component provided inside the valve body 100 to speed up the movement of the piston rod of the push-pull oil cylinder. By operating the power head motor reversing valve 200 provided in the valve body 100, it is possible to select whether to perform confluence, so that when the system is running, the operator can achieve the speed regulation function of the piston rod of the push-pull oil cylinder according to different working conditions. Moreover, compared with the prior art, the control system structure of this multi-way valve for a tunneling rig is more compact, the volume is reduced to 50% of the original, and at the same time, the number of hydraulic components is reduced to reduce the weight of the hydraulic system. The actual weight reduction is about 50 kg, making the entire hydraulic system highly integrated and greatly improving the stable reliability of the operation of this multi-way valve.

[0042] Specifically, the working principle of the multi-way valve of the present invention is as follows:

[0043] (1) When the spool of the power head motor reversing valve 200 reverses to the left, the pressure oil entering from the large pump inlet 101 enters the working chamber at one end of the power head motor through the power head control port A201. At the same time, the pressure oil in the working chamber at the other end of the power head motor enters the power head control port B202 and returns to the fuel tank through the oil return port 103, and the power head motor makes a forward rotational movement; when the spool of the power head motor reversing valve 200 reverses to the right, the pressure oil entering from the large pump inlet 101 enters the working chamber at one end of the power head motor through the power head control port B202. At the same time, the pressure oil in the working chamber at the other end of the power head motor enters the power head control port A201 and returns to the fuel tank through the oil return port 103, and the power head motor makes a reverse rotational movement; when the spool of the power head motor reversing valve 200 moves to the central position, its inlet is closed, and at the same time, the channels between the power head control port A201 and the power head control port B202 are all closed, and the working chambers at both ends of the power head motor are both closed and in a static state. At this time, the power head motor reversing valve 200 does not use the pressure oil at the large pump inlet 101;

[0044] When the spool of the push-pull oil cylinder reversing valve 160 reverses to the left, the pressure oil entering from the small pump inlet 102 enters the rod chamber of the push-pull oil cylinder through the push-pull control port A161, pushing the piston rod of the push-pull oil cylinder to retract and perform a backward movement. At the same time, the pressure oil in the rodless chamber of the push-pull oil cylinder enters the push-pull control port B162 and then returns to the fuel tank from the oil return port 103; when the spool of the push-pull oil cylinder reversing valve 160 reverses to the right, the pressure oil entering from the small pump inlet 102 enters the rodless chamber of the push-pull oil cylinder through the push-pull control port B162, pushing the piston rod of the push-pull oil cylinder to extend and perform a forward movement. At the same time, the pressure oil in the rodless chamber of the push-pull oil cylinder enters the push-pull control port A161 and then returns to the fuel tank from the oil return port 103; when the spool of the push-pull oil cylinder reversing valve 160 moves to the central position, its inlet is closed, and at the same time, the channels between the push-pull control port A161 and the push-pull control port B162 are all closed, and both the rod chamber and the rodless chamber of the push-pull oil cylinder are closed, being in a static state, that is, the actuator push-pull oil cylinder does not operate;

[0045] When the spool of the chuck oil cylinder reversing valve 300 reverses to the left, the pressure oil entering from the small pump inlet 102 enters the rod chamber of the chuck oil cylinder through the chuck control port A301, pushing the piston rod of the chuck oil cylinder to retract and perform a backward movement. At the same time, the pressure oil in the rodless chamber of the chuck oil cylinder enters the chuck control port B302 and then returns to the fuel tank from the oil return port 103; when the spool of the chuck oil cylinder reversing valve 300 reverses to the right, the pressure oil entering from the small pump inlet 102 enters the rodless chamber of the chuck oil cylinder through the chuck control port B302, pushing the piston rod of the chuck oil cylinder to extend and perform a forward movement. At the same time, the pressure oil in the rodless chamber of the chuck oil cylinder enters the chuck control port A301 and then returns to the fuel tank from the oil return port 103; when the spool of the chuck oil cylinder reversing valve 300 moves to the central position, its inlet is closed, and at the same time, the channels between the chuck control port A301 and the chuck control port B302 are all closed, and both the rod chamber and the rodless chamber of the chuck oil cylinder are closed, being in a static state, that is, the actuator chuck oil cylinder does not operate;

[0046] When the spool of the gripper reversing valve 400 reverses to the left, the pressure oil entering from the small pump oil inlet 102 enters the working chamber at one end of the gripper through the gripper control port A401. At the same time, the pressure oil in the working chamber at the other end of the gripper enters the gripper control port B402 and returns to the fuel tank through the oil return port 103, and the gripper performs a clamping action. When the spool of the gripper reversing valve 400 reverses to the right, the pressure oil entering from the large pump oil inlet 101 enters the working chamber at one end of the gripper through the gripper control port B402. At the same time, the pressure oil in the working chamber at the other end of the gripper enters the gripper control port A401 and returns to the fuel tank through the oil return port 103, and the gripper performs a loosening movement. When the spool of the gripper reversing valve 400 moves to the central position, its inlet is closed, and at the same time, the channels between the gripper control port A401 and the gripper control port B402 are all closed, and the working chambers at both ends of the gripper are both closed and in a static state, that is, the actuator gripper does not act.

[0047] (5)When the spool of the power head motor reversing valve 200 is in the central position, that is, when the power head motor reversing valve 200 does not use the pressure oil from the large pump oil inlet 101, if the spool of the push-pull oil cylinder reversing valve 160 reverses to the left or right at this time, then the pressure oil at the large pump oil inlet 101 does not enter the inlet of the power head motor reversing valve 200, but flows along the confluence pipeline 500 pipeline. After passing through the one-way valve 600, it converges with the pressure oil at the small pump oil inlet 102. After the two pressure oils are combined, they enter the rod chamber (or non-rod chamber) of the push-pull oil cylinder through the inlet of the push-pull oil cylinder reversing valve 160, thereby pushing the piston rod of the push-pull oil cylinder to move quickly, that is, changing the forward (or backward) speed of the piston rod of the actuator push-pull oil cylinder to meet the needs of different working conditions (mainly referring to, when drilling out or drilling in, combining the two pressure oils to accelerate the advancement and retraction speed of the piston rod of the push-pull oil cylinder, thereby improving the efficiency of drilling out and drilling in, and when drilling normally, the two pressure oils are separated to ensure the normal speed advancement of the piston rod of the push-pull oil cylinder).

[0048] An overflow valve 700 is also provided in the valve body 100. The inlet of the overflow valve 700 is communicated with the large pump oil inlet 101, and the outlet is communicated with the oil return port 103. Through the overflow valve 700, the oil pressure in the valve body 100 can be limited and stabilized within the safe pressure range set by the overflow valve 700. When the pressure exceeds the above set pressure, part of the pressure oil from the pressure oil entering from the large pump oil inlet 101 will flow to the fuel tank through the oil return port 103. In this way, the oil pressure in the valve body 100 is reduced to ensure the safe and stable operation of this multi-way valve.

[0049] An overflow valve 700 is provided in the valve body 100 and is communicated between the large pump oil inlet 101 and the oil return port 103 to limit the inlet oil pressure of the large pump oil inlet 101.

[0050] The valve body 100 is also provided with a large pump pressure measuring port 104 and a small pump pressure measuring port 105. The large pump pressure measuring port 104 is communicated with the large pump oil inlet 101 and is used for connecting a first hydraulic pressure gauge to measure the oil pressure at the large pump oil inlet 101. The small pump pressure measuring port 105 is communicated with the small pump oil inlet 102 and is used for connecting a second hydraulic pressure gauge to measure the oil pressure at the small pump oil inlet 102. During the operation of the multi-way valve, by measuring the oil pressures at the large pump oil inlet 101 and the small pump oil inlet 102, it is convenient for the operator to observe the oil pressure condition in the valve body 100 to perform corresponding operations (for example, when the oil pressure at the small pump oil inlet 102 is too small, increasing the output power of the small pump), ensuring the safe and stable operation of the tunnel drilling rig.

[0051] The valve body 100 is also provided with a first oil drain port 106 and a second oil drain port 107. The first oil drain port 106 is communicated with the outlet of the push-pull oil cylinder reversing valve 160, and the second oil drain port 107 is communicated with the outlet of the chuck oil cylinder reversing valve 300.

[0052] After adopting the above design, through the first oil drain port 106 and the second oil drain port 107, the oil drain of the remaining hydraulic control components can be introduced into the valve body 100 of the multi-way valve, so that the oil drain flows into the oil tank through the oil return port 103 after confluence. In this way, the hydraulic system structure of the multi-way valve is more compact and saves space.

[0053] The valve body 100 is also provided with a first reserved port 108 communicated with the power head control port A201 and a second reserved port 109 communicated with the power head control port B202. By setting the first reserved port 108 and the second reserved port 109, it is convenient for the upgrade of the hydraulic system, facilitating the connection of other actuators to the multi-way valve, and controlling the actions of the connected actuators through the power head motor reversing valve 200.

[0054] The main structure of the valve body 100 includes a large pump control valve housing 120, a power head motor control valve housing 800, a small pump control valve housing 130, a push-pull oil cylinder control valve housing 170, a chuck oil cylinder control valve housing 900, and a gripper control valve housing 110 connected in sequence. Correspondingly, the power head motor reversing valve 200 is arranged on the power head motor control valve housing 800, the push-pull oil cylinder reversing valve 160 is arranged on the push-pull oil cylinder control valve housing 170, the chuck oil cylinder reversing valve 300 is arranged on the chuck oil cylinder control valve housing 900, and the gripper reversing valve 400 is respectively arranged on the gripper control valve housing 110.

[0055] The inside of the large pump control valve housing 120, the power head motor control valve housing 800, the small pump control valve housing 130, the push-pull oil cylinder control valve housing 170, the chuck oil cylinder control valve housing 900 and the gripper control valve housing 110 is penetrated by a double-headed screw 140. Nuts 150 are threadedly engaged at both ends of the double-headed screw 140. By rotating the nuts 150 at both ends of the double-headed screw 140, the distance between the two nuts 150 is reduced to clamp and fit the large pump control valve housing 120, the power head motor control valve housing 800, the small pump control valve housing 130, the push-pull oil cylinder control valve housing 170, the chuck oil cylinder control valve housing 900 and the gripper control valve housing 110.

[0056] The large pump oil inlet 101, the oil return port 103 and the large pump pressure measuring port 104 are all arranged on the large pump control valve housing 120. The small pump oil inlet 102 and the small pump pressure measuring port 105 are all arranged on the small pump control valve housing 130. The first reserved port 108 and the second reserved port 109 are respectively arranged at both ends of the power head motor reversing valve 200. The first oil drain port 106 and the second oil drain port 107 are respectively arranged on the push-pull oil cylinder control valve housing 170 and the chuck oil cylinder control valve housing 900.

[0057] By adopting the above structure, the large pump control valve housing 120, the power head motor control valve housing 800, the small pump control valve housing 130, the push-pull oil cylinder control valve housing 170, the chuck oil cylinder control valve housing 900 and the gripper control valve housing 110 achieve convenient detachable connection through the double-headed screw 140 and the nut 150 with threaded fit. While facilitating assembly and splicing, it is convenient to troubleshoot, so that during actual operation, the damaged part in this multi-way valve can be found in time, and the damaged part can be quickly disassembled and replaced, reducing the maintenance cost while ensuring the working efficiency of the tunnel drilling rig.

[0058] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and retouches can be made, and these improvements and retouches should also be regarded as the protection scope of the present invention.

Claims

1. A multi-way valve for a tunnel drilling rig, comprising a valve body (100), wherein a large pump inlet (101), a small pump inlet (102) and an oil return port (103) are arranged on the valve body (100), and it is characterized in that: A power head motor reversing valve (200) connected between the large pump inlet (101) and the oil return port (103) and a push-pull oil cylinder reversing valve (160), a chuck oil cylinder reversing valve (300), and a gripper reversing valve (400) connected in series between the small pump inlet (102) and the oil return port (103) in sequence are arranged in the valve body (100); A confluence component for confluencing the pressure oil flowing into the large pump inlet (101) into the small pump inlet (102) is further arranged in the valve body (100); the confluence component includes a confluence pipeline (500) with two ends respectively communicated with the large pump inlet (101) and the small pump inlet (102), and a check valve (600) is arranged on the confluence pipeline (500); the valve body (100) includes a power head motor control valve housing (800), a push-pull oil cylinder control valve housing (170), a chuck oil cylinder control valve housing (900) and a gripper control valve housing (110) connected in sequence, and the power head motor reversing valve (200), the push-pull oil cylinder reversing valve (160), the chuck oil cylinder reversing valve (300) and the gripper reversing valve (400) are respectively arranged on the power head motor control valve housing (800), the push-pull oil cylinder control valve housing (170), the chuck oil cylinder control valve housing (900) and the gripper control valve housing (110); a large pump control valve housing (120) is arranged on one side of the power head motor control valve housing (800) facing away from the push-pull oil cylinder control valve housing (170), a small pump control valve housing (130) is arranged between the power head motor control valve housing (800) and the push-pull oil cylinder control valve housing (170), the large pump inlet (101) and the oil return port (103) are arranged on the large pump control valve housing (120), and the small pump inlet (102) is arranged on the small pump control valve housing (130); the large pump control valve housing (120), the power head motor control valve housing (800), the small pump control valve housing (130), the push-pull oil cylinder control valve housing (170), the chuck oil cylinder control valve housing (900) and the gripper control valve housing (110) are connected by a double-headed screw (140) and nuts (150) threadedly matched at both ends of the double-headed screw (140).

2. The multi-way valve for a tunnel drilling rig according to claim 1, characterized in that: An overflow valve (700) communicating between the large pump inlet (101) and the oil return port (103) is arranged in the valve body (100) to limit the oil inlet pressure of the large pump inlet (101).

3. The multi-way valve for a drift drill according to claim 1, characterized in that: The valve body (100) is provided with a large pump pressure measuring port (104) and a small pump pressure measuring port (105) that are respectively communicated with the large pump oil inlet (101) and the small pump oil inlet (102). The large pump pressure measuring port (104) and the small pump pressure measuring port (105) are respectively used to connect a first hydraulic pressure gauge and a second hydraulic pump.

4. The multi-way valve for a tunnel drilling rig according to claim 1, characterized in that: The valve body (100) is further provided with a first oil drain port (106) and a second oil drain port (107) that are respectively communicated with the outlet of the push-pull oil cylinder reversing valve (160) and the outlet of the chuck oil cylinder reversing valve (300).

5. The multi-way valve for a tunnel drilling rig according to claim 1, characterized in that: The power head motor reversing valve (200), the push-pull oil cylinder reversing valve (160), the chuck oil cylinder reversing valve (300), and the gripper reversing valve (400) are all three-way four-position reversing valves.

6. The multi-way valve for a tunnel drilling rig according to claim 5, characterized in that: The valve body (100) is provided with a first reserved port (108) and a second reserved port (109) that are respectively communicated with two power head control ports of the power head motor reversing valve (200).

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