A multifunctional combined multi-way reversing valve for a fully hydraulic tunnel drilling rig

Abstract

A multifunctional combined multi-way reversing valve for a fully hydraulic tunnel drilling rig comprises a linkage valve plate, a propulsion valve plate, a power switching valve plate, a pressure relief valve plate, a speed regulating valve plate, a rotary valve plate, an oil inlet switching valve plate and left and right travel valve plates connected in sequence; an oil inlet P2 and an oil outlet P3 are provided on the power switching valve plate; an oil inlet P1 and an oil return port T1 are provided on the oil inlet switching valve plate; the power switching valve plate is a first two-position three-way reversing valve, whose d1 port is connected to the oil inlet P2, whose d2 port is connected to the internal oil inlet x1 of the pressure relief safety valve plate through an internal oil passage, and whose d3 port is connected to the oil outlet P3; the oil inlet switching valve plate comprises a second two-position three-way reversing valve, whose g1 port is connected to the internal oil port of the rotary valve plate through an internal oil passage, whose g2 port is respectively connected to the internal oil ports of the left travel valve plate and the right travel valve plate, and whose g3 port is connected to the oil inlet P1. The valve has a compact structure, few external pipes, a small volume, is easy to install and operate, and is convenient for maintenance.

Description

Technical Field

[0001] The invention relates to the field of hydraulic control of tunnel drilling rigs, and in particular to a multifunctional combined multi-way reversing valve for a full hydraulic tunnel drilling rig. Background Art

[0002] Fully hydraulic tunnel drilling rigs are mainly used for underground drilling in coal mines, gas extraction and discharge holes, grouting and fire extinguishing holes, coal seam water injection holes, anti-burst pressure relief holes, and geological exploration holes. Tunnel drilling rigs are generally composed of hydraulic power source mechanism, power rotation mechanism, driving power rotation mechanism, forward and backward propulsion mechanism, hydraulic control system, and clamp mechanism. The power source mechanism converts electrical energy into hydraulic energy, and the power rotation mechanism consists of a hydraulic motor, a reducer, and a hydraulic chuck. The propulsion mechanism is mainly composed of guide rails and propulsion cylinders. Among them, the hydraulic control system is mainly composed of a multi-way reversing valve, a relief valve, a pressure reducing valve, a secondary safety valve, a speed regulating throttle valve, a shuttle valve, a check valve, and a hydraulically controlled check valve. The clamp mechanism consists of two single-acting cylinders, slips, and springs. When drilling, the multi-way reversing valve is activated, and the hydraulic motor drives the hydraulic chuck to rotate through the reducer while the hydraulic chuck clamps the drilling rig. At this time, the clamp is filled with oil to open the slips. When the drill needs to be withdrawn, the multi-way valve reversing valve drives the oil cylinder backward, at which time the hydraulic chuck is clamped and the clamp is opened. When the multi-way reversing valve does not move, the chuck and the clamp are in a clamped state to ensure that the drill rod will not slide down when drilling an elevation hole.

[0003] The hydraulic control system of the existing tunnel drilling rig is composed of multiple independent hydraulic valves, and each valve group is connected to each other through hydraulic pipes. The disadvantages are that there are many external pipes, large volume, inconvenient operation, easy oil leakage, and difficult maintenance. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a multifunctional combined multi-way reversing valve for a fully hydraulic tunnel drilling rig, which has a compact structure, few external pipes, a small size, is easy to install and operate, and is convenient to maintain.

[0005] To solve the above problems, the present invention adopts the following technical solutions:

[0006] A multifunctional combined multi-way reversing valve for a fully hydraulic tunnel drilling rig comprises a linkage valve plate, a propulsion valve plate, a pressure relief valve plate, a speed regulating valve plate and a rotary valve plate which are connected in sequence. The special features of the valve are as follows: a power switching valve plate is arranged between the propulsion valve plate and the pressure relief safety valve plate, and an oil inlet P2 and an oil outlet P3 are arranged on the valve plate, which are respectively used to connect an auxiliary pump and a leg oil circuit of the tunnel drilling rig; an oil inlet switching valve plate, a left travel valve plate and a right travel valve plate are arranged in sequence on one side of the rotary valve plate; an oil inlet P1 and an oil return port T1 are arranged on the oil inlet switching valve plate, which are respectively used to connect a main pump and an oil tank; the left travel valve plate and the right travel valve plate are respectively used to connect a left travel motor and a right travel motor;

[0007] The power switching valve plate is a first two-position three-way reversing valve, whose d1 port is connected to the oil inlet P2, whose d2 port is connected to the internal oil inlet x1 of the pressure reducing safety valve plate through the internal oil passage, and whose d3 port is connected to the oil outlet P3;

[0008] The oil inlet switching valve plate includes a second two-position three-way reversing valve, whose g1 port is connected to the internal oil port of the rotary valve plate through an internal oil passage, its g2 port is respectively connected to the internal oil ports of the left travel valve plate and the right travel valve plate through internal oil passages, and its g3 port is connected to the oil inlet P1; it is used to switch the main pump oil pressure to control the rotary valve plate and the left and right travel valve plates respectively.

[0009] Preferably, a main overflow valve is provided in the oil inlet switching valve plate, and the main overflow valve is connected between the oil inlet port P1 and the oil return port T1 to control the oil pressure input by the main pump.

[0010] Preferably, a travel overflow valve is also provided in the oil inlet switching valve plate, and a P4 port is also provided on the valve plate; an oil return valve plate is provided on one side of the right travel valve plate, and an oil return port T2 is provided on the oil return valve plate; the P4 port is connected to the g2 port of the second two-position three-way reversing valve, and is connected to the oil return port T2 through the travel overflow valve; the P4 port is used for an external throttle valve to flow back to the oil tank to adjust the speed of the travel motor.

[0011] Preferably, the left travel valve plate and the right travel valve plate are respectively the first three-position six-way reversing valve and the second three-position six-way reversing valve, and both three-position six-way reversing valves are Y-type; working ports A5 and B5 are provided on the left travel valve plate, and working ports A6 and B6 are provided on the right travel valve plate, which are respectively used to connect the left travel motor and the right travel motor; the z1 and z2 ports of the first three-position six-way reversing valve and the t2 port of the second three-position six-way reversing valve are respectively connected to the g2 port of the second two-position three-way reversing valve; the z5 and z6 ports of the first three-position six-way reversing valve are respectively connected to the working ports A5 and B5 in a one-to-one correspondence, and its z4 port is connected to the t1 port of the second three-position six-way reversing valve; the t5 and t6 ports of the second three-position six-way reversing valve are respectively connected to the working ports A6 and B6 in a one-to-one correspondence; the z3 port of the first three-position six-way reversing valve and the t3 port of the second three-position six-way reversing valve are respectively connected to the oil return port T2.

[0012] Preferably, the rotary valve plate includes a Y-type third three-position six-way reversing valve and a first one-way valve, the g1 port of the second two-position three-way reversing valve is connected to the f5 port of the third three-position six-way reversing valve and is connected to the f4 port of the third three-position six-way reversing valve through the first one-way valve, the f6 port of the third three-position six-way reversing valve is connected to the oil return port T1; the f1 and f3 ports of the third three-position six-way reversing valve are respectively connected to the internal oil ports of the speed regulating valve plate, and the f2 port of the third three-position six-way reversing valve is connected to the internal oil ports c5 and c6 of the propulsion valve plate.

[0013] Preferably, the speed regulating valve plate includes two one-way throttle valves, two secondary relief valves and a shuttle valve, and working ports A1 and B1 are provided on the speed regulating valve plate for connecting the hydraulic motor; the two one-way throttle valves are respectively connected between the f1 port and the working port A1, and between the f3 port and the working port B1 of the third three-position six-way reversing valve; the two secondary relief valves are respectively connected between the working ports A1, B1 and the oil return port T1; the two oil inlets of the shuttle valve are respectively connected to the working ports A1 and B1, and the oil outlet of the shuttle valve is connected to the working port A4 provided on the linkage valve plate through an internal oil channel.

[0014] Preferably, the pressure reducing safety valve plate includes a third two-position three-way reversing valve, a relief valve, an adjustable relief valve, a pressure reducing valve and second and third one-way valves; the internal oil inlet x1 of the pressure reducing safety valve plate is connected to the e3 port of the third two-position three-way reversing valve through the second one-way valve 23 and the internal oil passage; the e1 port of the third two-position three-way reversing valve is connected to the internal oil outlet x2 of the pressure reducing safety valve plate through the internal oil passage; the e2 port of the third two-position three-way reversing valve is connected to the working port A4 provided on the linkage valve plate through the internal oil passage; the relief valve and the adjustable relief valve are connected in parallel between the internal oil inlet x1 and the oil return port T1; the pressure reducing valve and the third one-way valve 27 are connected in sequence between the internal oil inlet x1 and the internal oil outlet x2; the internal oil outlet x2 is connected to the internal oil ports c5 and c6 of the propulsion valve plate.

[0015] Preferably, the propulsion valve plate includes a fourth three-position six-way reversing valve and two overload safety valves, and working ports A2 and B2 are provided on the valve plate for connecting the propulsion cylinder; the fourth three-position six-way reversing valve is Y-type, and its c1 and c3 ports are respectively connected to the working ports A2 and B2, and the c2 and c4 ports are connected to the return oil port T1; the two overload safety valves are respectively connected between the c1 and c3 ports and the return oil port T1, for providing overload protection for the propulsion cylinder.

[0016] Preferably, the linkage valve plate includes a fourth two-position three-way reversing valve, an O-type three-position four-way reversing valve, a hydraulically controlled one-way valve, a fourth one-way valve and an oil return throttle valve, and working ports A3, A4 and an oil return port T3 are provided on the linkage valve plate; wherein the a1 port of the fourth two-position three-way reversing valve is connected to the working port A3 for an externally connected clamp; its a2 port is connected to the b1 port of the three-position four-way reversing valve and is connected to the working port A4 through the fourth one-way valve, and its a3 port is connected to the working port A4 through an internal oil channel; the b2 port of the three-position four-way reversing valve is connected to the control port of the hydraulically controlled one-way valve through the internal oil channel, and the b3 and b4 ports are connected to the c1 and c3 ports of the fourth three-position six-way reversing valve respectively; the hydraulically controlled one-way valve and the oil return throttle valve are sequentially connected between the working port A4 and the oil return port T3 through the internal oil channel, and are used to control the unloading of the hydraulic chuck connected to the working port A4.

[0017] The beneficial effects of the present invention are:

[0018] 1. Since the multi-way reversing valve is provided with a power switching valve plate between the propulsion valve plate and the pressure reducing safety valve plate, and an oil inlet P2 and an oil outlet P3 are provided on the valve plate, which are respectively used to connect the auxiliary pump and the outrigger oil circuit of the tunnel drilling rig; the power switching valve plate is a first two-position three-way reversing valve, whose d1 port is connected to the oil inlet P2, whose d2 port is connected to the internal oil inlet x1 of the pressure reducing safety valve plate through the internal oil passage, and whose d3 port is connected to the oil outlet P3; by switching the power switching valve plate to the lower position, the auxiliary pump oil supply can be introduced into the propulsion valve plate through the pressure reducing safety valve plate, and the action of the propulsion cylinder can be controlled by the propulsion valve plate; at the same time, the linkage valve plate is introduced, and the hydraulic chuck and the contactor are controlled by the linkage valve plate to realize linkage; by switching the power switching valve plate to the upper position, the oil supply to the outrigger oil circuit can be realized.

[0019] 2. Since an oil inlet switching valve plate, a left travel valve plate and a right travel valve plate are sequentially arranged on one side of the rotary valve plate; an oil inlet port P1 and an oil return port T1 are arranged on the oil inlet switching valve plate, which are respectively used to connect the main pump and the oil tank; the left travel valve plate and the right travel valve plate are respectively used to connect the left travel motor and the right travel motor; by switching the oil inlet switching valve plate to the upper position, the oil supply of the main pump can be introduced into the left travel valve plate and the right travel valve plate, thereby controlling the actions of the left travel motor and the right travel motor respectively; by switching the oil inlet switching valve plate to the lower position, the oil supply of the main pump can be introduced into the rotary valve plate, and the action of the external hydraulic motor can be controlled through the speed regulating valve plate.

[0020] 3. Connecting multiple valve plates in sequence with bolts and interconnecting them through internal oil channels not only greatly reduces the volume, reduces external connecting oil pipes and external leakage points, and is easy to install and maintain; and the three-position six-way valve and three-position four-way valve of the rotary valve plate and the propulsion valve plate can be operated individually or in combination, and have a linkage function, making the drilling rig easy to operate and more efficient.

[0021] 4. Through the fourth one-way valve and the hydraulic one-way valve of the linkage valve plate, the hydraulic chuck and the clamp can be always in a clamped state when the drilling rig is shut down and the drill rod is added, thereby avoiding personal injury caused by the slipping of the drill rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention.

[0023] Figure 2 yes Figure 1 Bottom view of .

[0024] Figure 3 It is the hydraulic principle diagram of the present invention.

[0025] In the figure: connecting bolt 1, installing tail plate 2, linkage valve plate 3, propulsion valve plate 4, power switching valve plate 5, pressure reducing safety valve plate 6, speed regulating valve plate 7, rotary valve plate 8, oil inlet switching valve plate 9, left travel valve plate 10, right travel valve plate 11, oil return valve plate 12, connecting bolt 13, hydraulic control one-way valve 14, oil return throttle valve 15, fourth one-way valve 16, first two-position three-way reversing valve 17, fourth two-position three-way reversing valve 18, three-position four-way reversing valve 19, overload safety valve 20, fourth three-position six-way reversing valve 21, third two-position three-way reversing valve 22, second One-way valve 23, relief valve 24, adjustable relief valve 25, pressure reducing valve 26, third one-way valve 27, third three-position six-way reversing valve 28, second two-position three-way reversing valve 29, main relief valve 30, travel relief valve 31, first three-position six-way reversing valve 32, second three-position six-way reversing valve 33, first one-way valve 34, one-way throttle valve 35, hydraulic motor 36, secondary relief valve 37, shuttle valve 38, one-way valve 39, hydraulic chuck 40, clamp 41, hydraulically controlled two-position two-way valve group 42, propulsion cylinder 43, right travel motor 44, left travel motor 45. DETAILED DESCRIPTION

[0026] like Figure 1 to Figure 3 As shown, the present invention relates to a multifunctional combined multi-way reversing valve for a fully hydraulic tunnel drilling rig, comprising a mounting tail plate 2, a linkage valve plate 3, a propulsion valve plate 4, a pressure relief valve plate 6, a speed regulating valve plate 7, and a rotary valve plate 8 connected in sequence, a power switching valve plate 5 is provided between the propulsion valve plate 4 and the pressure relief safety valve plate 6, and an oil inlet P2 and an oil outlet P3 are provided on the power switching valve plate 5, which are respectively used to connect the auxiliary pump and the leg oil circuit of the tunnel drilling rig. The mounting tail plate 2, the linkage valve plate 3, the propulsion valve plate 4, and the power switching valve plate 5 are connected to one side of the pressure relief safety valve plate 6 through four connecting bolts 1.

[0027] On one side of the rotary valve disc 8, the oil inlet switching valve disc 9, the left travel valve disc 10, the right travel valve disc 11 and the oil return valve disc 12 are connected in sequence by bolts; the oil inlet switching valve disc 9 is provided with an oil inlet port P1 and an oil return port T1, which are respectively used to connect the main pump and the oil tank; the left travel valve disc 10 is provided with working ports A5 and B5, and the right travel valve disc 11 is provided with working ports A6 and B6, which are respectively used to connect the left travel motor 45 and the right travel motor 44. The speed regulating valve disc 7, the rotary valve disc 8, the oil inlet switching valve disc 9, the left travel valve disc 10, the right travel valve disc 11 and the oil return valve disc 12 are sequentially connected to the other side of the pressure reducing safety valve disc 6 by four connecting bolts 13.

[0028] The power switching valve plate 5 is a first two-position three-way reversing valve 17, whose d1 port is connected to the oil inlet P2 through an internal oil passage, whose d2 port is connected to the internal oil inlet x1 of the pressure reducing safety valve plate 6 through an internal oil passage, and whose d3 port is connected to the oil outlet P3.

[0029] The pressure reducing safety valve plate 6 comprises a third two-position three-way reversing valve 22, a relief valve 24, an adjustable relief valve 25, a pressure reducing valve 26, a second one-way valve 23, and a third one-way valve 27. An internal oil inlet x1 and an internal oil outlet x2 are provided in the pressure reducing safety valve plate 6, wherein the internal oil inlet x1 is connected to the e3 port of the third two-position three-way reversing valve 22 through the second one-way valve 23 and the internal oil passage, and the e1 port of the third two-position three-way reversing valve 22 is connected to the internal oil outlet x2 through the internal oil passage. The oil port x2 is connected, and the e2 port of the third two-position three-way reversing valve 22 is connected to the working port A4 arranged on the linkage valve plate 3 through the internal oil passage; the relief valve 24 and the adjustable relief valve 25 are connected in parallel between the internal oil inlet x1 and the oil return port T1; the pressure reducing valve 26 and the third one-way valve 27 are connected in sequence between the internal oil inlet x1 and the internal oil outlet x2, and the internal oil outlet x2 is connected to the internal oil ports c5 and c6 of the propulsion valve plate 4 respectively.

[0030] The propulsion valve plate 4 includes a fourth three-position six-way reversing valve 21 and two overload safety valves 20, and the valve plate is provided with working ports A2 and B2 for connecting the propulsion oil cylinder 43. The fourth three-position six-way reversing valve 21 is Y-shaped, and its c1 and c3 ports are respectively connected to the working ports A2 and B2, and the c2 and c4 ports are respectively connected to the oil return port T1 through the internal oil passage; the c5 port is connected to the internal oil outlet x2, and the c6 port is connected to the internal oil outlet x2 through a one-way valve 39. The two overload safety valves 20 are respectively connected between the c1 and c3 ports and the oil return port T1 to provide overload protection for the propulsion oil cylinder 43.

[0031] The linkage valve plate 3 includes a fourth two-position three-way reversing valve 18, an O-type three-position four-way reversing valve 19, a hydraulically controlled one-way valve 14, a fourth one-way valve 16 and an oil return throttle valve 15, and is provided with working ports A3, A4 and an oil return port T3 on the linkage valve plate 3; wherein the a1 port of the fourth two-position three-way reversing valve 18 is connected to the working port A3 for an externally connected clamper 41; its a2 port is connected to the b1 port of the three-position four-way reversing valve 19 and is connected to the working port A4 for an externally connected hydraulic chuck 40 through the fourth one-way valve 16, and its a3 port is connected to the working port A4 through an internal oil passage. The b2 port of the three-position four-way reversing valve 19 is connected to the control port of the hydraulically controlled one-way valve 14 through an internal oil passage, so as to control the opening of the hydraulically controlled one-way valve 14; the b3 and b4 ports of the three-position four-way reversing valve 19 are respectively connected to the c1 and c3 ports of the fourth three-position six-way reversing valve 21; the hydraulically controlled one-way valve 14 and the return oil throttle valve 15 are connected in sequence between the working port A4 and the return oil port T3 through an internal oil passage, so as to control the unloading of the hydraulic chuck 40 connected to the working port A4.

[0032] The oil inlet switching valve plate 9 includes a second two-position three-way reversing valve 29, a main overflow valve 30 and a travel overflow valve 31, wherein the g1 port of the second two-position three-way reversing valve 29 is connected to the internal oil port of the rotary valve plate 8 through an internal oil passage, the g2 port thereof is respectively connected to the internal oil ports of the left travel valve plate 10 and the right travel valve plate 11 through an internal oil passage, and the g3 port thereof is connected to the oil inlet P1; it is used to switch the main pump oil pressure to control the rotary valve plate 8 and the left and right travel valve plates respectively. The main overflow valve 30 is connected between the oil inlet P1 and the oil return port T1, and is used to control the oil pressure input by the main pump.

[0033] A P4 port is also provided on the oil inlet switching valve plate 9; an oil return port T2 is provided on the oil return valve plate 12. The P4 port is connected to the g2 port of the second two-position three-way reversing valve 29, and is connected to the oil return port T2 through the travel relief valve 31; the P4 port is used to connect an external throttle valve to return oil to the oil tank to adjust the speed of the travel motor.

[0034] The left travel valve disc 10 and the right travel valve disc 11 are respectively the first three-position six-way reversing valve 32 and the second three-position six-way reversing valve 33, and both three-position six-way reversing valves are Y-type. The z1 and z2 ports of the first three-position six-way reversing valve 32 and the t2 port of the second three-position six-way reversing valve 33 are respectively connected to the g2 port of the second two-position three-way reversing valve 29; the z5 and z6 ports of the first three-position six-way reversing valve 32 are respectively connected to the working ports A5 and B5, and its z4 port is connected to the t1 port of the second three-position six-way reversing valve 33; the t5 and t6 ports of the second three-position six-way reversing valve 33 are respectively connected to the working ports A6 and B6; the z3 port of the first three-position six-way reversing valve 32 and the t3 port of the second three-position six-way reversing valve 33 are respectively connected to the oil return port T2 through the internal oil passage.

[0035] The rotary valve plate 8 includes a Y-type third three-position six-way reversing valve 28 and a first one-way valve 34; the g1 port of the second two-position three-way reversing valve 29 is connected to the f5 port of the third three-position six-way reversing valve 28 and is connected to the f4 port of the third three-position six-way reversing valve 28 through the first one-way valve 34; the f6 port of the third three-position six-way reversing valve 28 is connected to the oil return port T1; the f1 and f3 ports of the third three-position six-way reversing valve 28 are respectively connected to the internal oil ports m1 and m2 of the speed regulating valve plate 7; the f2 port of the third three-position six-way reversing valve 28 is connected to the internal oil ports c5 and c6 of the propulsion valve plate 4.

[0036] The speed regulating valve plate 7 includes two one-way throttle valves 35, two secondary relief valves 37 and a shuttle valve 38. The speed regulating valve plate 7 is provided with working ports A1, B1 and control port C. The working ports A1 and B1 are used to connect the hydraulic motor 36. The two one-way throttle valves 35 are respectively connected between the port m1 and the working port A1, and between the port m2 and the working port B1; the two secondary relief valves 37 are respectively connected between the working ports A1, B1 and the oil return port T1; the two oil inlets n1 and n2 of the shuttle valve 38 are respectively connected to the working ports B1 and A1, and the oil outlet n3 of the shuttle valve 38 is connected to the working port A4 provided on the linkage valve plate 3 through the internal oil passage. The control port C is connected to the internal oil port m1 of the speed regulating valve plate 7, and is used to connect an external two-position two-way hydraulic control valve group, so as to control the propulsion of the propulsion cylinder 43 when the hydraulic motor 36 rotates forward.

[0037] During installation, the multifunctional combined multi-way reversing valve for the fully hydraulic tunnel drilling rig is installed on the drilling rig through the mounting holes provided on the mounting tail plate 2 and the oil return valve plate 12; the oil inlet P1 and the oil return port T1 are connected to the main pump and the oil tank respectively, the oil inlet P2 and the oil outlet P3 are connected to the auxiliary pump and the outrigger oil circuit respectively, and the P4 port is connected to the throttle valve externally and flows back to the oil tank. The working port A4 is connected to the oil inlet of the hydraulic chuck 40 through an oil pipe, the working port A3 is connected to the clamping oil port of the clamp 41 through an oil pipe, the control port C is connected to the loosening oil port of the clamp 41 through an oil pipe, the working ports A1 and B1 are respectively connected to the two working oil ports of the hydraulic motor 36, the working port B2 is connected to the rodless chamber interface v7 of the propulsion cylinder 43, and the working ports A5 and B5 and the working ports A6 and B6 are respectively connected to the left travel motor 45 and the right travel motor 44 through oil pipes.

[0038] Then, the control port C and the working ports A2 and B2 and the rod cavity interface v8 of the propulsion oil cylinder 43 are connected to the external hydraulically controlled two-position two-way valve group 42, so as to realize the linkage between the clamp 41 and the propulsion oil cylinder 43 when controlling the forward and reverse rotation of the hydraulic motor 36. The hydraulically controlled two-position two-way valve group 42 is composed of a hydraulically controlled two-position two-way valve and two shuttle valves, wherein the external oil port k1 is connected to the working port B2, the external oil port v3 is connected to the working port A2, the internal oil port v2 is connected to the rod cavity interface v8 of the propulsion oil cylinder 43, and the oil inlet k5 of one shuttle valve is connected to the control port C.

[0039] During operation, when it is necessary to control the tunnel drilling rig to travel, the second two-position three-way reversing valve 29 is switched to the upper position, and the oil from the main pump enters the left travel valve plate 10 and the right travel valve plate 11 through the second two-position three-way reversing valve 29 and the internal oil channel. When the first three-position six-way reversing valve 32 and the second three-position six-way reversing valve 33 are switched to the lower position, the z2 port and the z5 port are connected, the t2 port and the t5 port are connected, and the oil is respectively supplied to the left travel motor 45 and the right travel motor 44 through the working port A5 and the working port A6, so that the left and right travel motors rotate forward respectively, and the tunnel drilling rig moves forward. Conversely, when the first three-position six-way reversing valve 32 and the second three-position six-way reversing valve 33 are switched to the upper position, the z2 port and the z6 port are connected, the t2 port and the t6 port are connected, and the oil is respectively supplied to the left travel motor 45 and the right travel motor 44 through the working port B5 and the working port B6, so that the left and right travel motors rotate in the opposite direction respectively, and the tunnel drilling rig moves backward. During traveling, the traveling working pressure can be controlled by the traveling relief valve 31 .

[0040] After walking is completed, the second two-position three-way reversing valve 29 is switched to the lower position, the g3 port and the g1 port are connected, and the oil from the main pump enters the third three-position six-way reversing valve 28 of the rotary valve plate through the second two-position three-way reversing valve 29 and the internal oil channel. When the third three-position six-way reversing valve 28 is in the middle position, the hydraulic motor 36 is in a floating state.

[0041] When the third three-position six-way reversing valve 28 is switched to the lower position, f4 is connected to f1 port, f3 is connected to f6 port, and the oil from the main pump passes through the second two-position three-way reversing valve 29, the third three-position six-way reversing valve 28 and the one-way throttle valve 35 in turn, and enters the hydraulic motor 36 through the working port A1. The other side of the hydraulic motor 36 is connected back to the oil tank through the working port B1, the one-way throttle valve 35, the third three-position six-way reversing valve 28 and the return oil port T1 in turn, and the hydraulic motor 36 reverses; at the same time, the pressure oil passes through the one-way throttle valve 35 and then enters the hydraulic chuck 40 through the shuttle valve and the working port A4, so that the hydraulic chuck 40 is clamped.

[0042] On the contrary, when the third three-position six-way reversing valve 28 is switched to the upper position, f4 is connected to f3, f1 is connected to f6, and the oil from the main pump passes through the second two-position three-way reversing valve 29, the third three-position six-way reversing valve 28 and the one-way throttle valve 35 in sequence and enters the hydraulic motor 36 through the working port B1. The other side of the hydraulic motor 36 is connected back to the oil tank through the working port A1, the one-way throttle valve 35, the third three-position six-way reversing valve 28 and the return oil port T1 in sequence, and the hydraulic motor 36 rotates forward. At the same time, the pressure oil passes through the internal oil port m1 of the speed regulating valve plate 7 and enters the release oil port of the clamp 41 and the hydraulic two-position two-way valve group 42 through the control port C, so that the clamp 41 is released and enters the hydraulic two-position two-way valve group 42, and then enters the two-position two-way valve through k5 and k4 in sequence to change the direction, so that the rod cavity interface v8 of the thrust cylinder 43 is connected to the return oil port T1 through the hydraulic two-position two-way valve group 42, the working port A2 and the thrust valve plate 4, so as to realize the feeding of the thrust cylinder 43. At the same time, the pressure oil passes through the one-way throttle valve 35 and then enters the hydraulic chuck 40 through the shuttle valve and the working port A4, so that the hydraulic chuck 40 is clamped.

[0043] The oil from the auxiliary pump enters the power switching valve plate 5 through the oil inlet P2. When the first two-position three-way reversing valve 17 is switched to the upper position, the oil from the auxiliary pump enters the outrigger oil circuit through the oil outlet P3 to control the outrigger lifting and lowering of the tunnel drilling rig.

[0044] When the first two-position three-way reversing valve 17 is controlled to the lower position, the oil from the auxiliary pump enters the pressure relief valve plate 6 through the first two-position three-way reversing valve 17. When the pressure exceeds the pressure set by the relief valve, the pressure oil is unloaded through the relief valve and returns to the oil tank through the oil return port T1; when the thrust cylinder 43, the clamp 41 and the hydraulic chuck 40 do not require high pressure, the adjustable relief valve 25 is adjusted to the required pressure. When the third two-position three-way reversing valve 22 is switched to the lower position, the pressure oil entering the pressure relief safety valve plate enters the thrust valve plate 4 through the third two-position three-way reversing valve 22. At this time, the fourth three-position six-way reversing valve 21 is switched to the upper position or the lower position, and the thrust cylinder 43 can be respectively controlled to be pushed or retracted. By switching the three-position four-way reversing valve 19 and the fourth two-position three-way reversing valve 18 at the same time, the hydraulic chuck 40 and the clamp 41 can be controlled to realize linkage with the thrust cylinder 43.

[0045] When the resistance increases during the drilling process of the drill pipe, the third two-position three-way reversing valve 22 is switched to the upper position, and the pressure oil entering the pressure reducing safety valve plate enters the propulsion valve plate 4 through the pressure reducing valve 26. The pressure reducing valve 26 can ensure that the pressure oil entering the propulsion cylinder is stable; the other way passes through the third two-position three-way reversing valve through the working port A4 to enter the hydraulic chuck, which can achieve strong clamping of the hydraulic chuck.

[0046] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A multifunctional combined multi-way reversing valve for a fully hydraulic tunnel drilling rig, comprising a linkage valve plate, a propulsion valve plate, a pressure relief safety valve plate, a speed regulating valve plate, and a rotary valve plate connected in sequence, characterized in that: A power switching valve plate is provided between the propulsion valve plate and the pressure relief safety valve plate, and an oil inlet P2 and an oil outlet P3 are provided on the valve plate, which are respectively used to connect the auxiliary pump and the leg oil circuit of the tunnel drilling rig; an oil inlet switching valve plate, a left travel valve plate and a right travel valve plate are provided on one side of the rotary valve plate in sequence; an oil inlet P1 and an oil return port T1 are provided on the oil inlet switching valve plate, which are respectively used to connect the main pump and the oil tank; the left travel valve plate and the right travel valve plate are respectively used to connect the left travel motor and the right travel motor; The power switching valve plate is a first two-position three-way reversing valve, whose d1 port is connected to the oil inlet P2, whose d2 port is connected to the internal oil inlet x1 of the pressure reducing safety valve plate through the internal oil passage, and whose d3 port is connected to the oil outlet P3; The oil inlet switching valve plate includes a second two-position three-way reversing valve, whose g1 port is connected to the internal oil port of the rotary valve plate through the internal oil passage, whose g2 port is connected to the internal oil ports of the left travel valve plate and the right travel valve plate through the internal oil passage, and whose g3 port is connected to the oil inlet P1; and is used to switch the main pump oil pressure to control the rotary valve plate and the left and right travel valve plates respectively; The oil inlet switching valve plate is provided with a main overflow valve, which is connected between the oil inlet port P1 and the oil return port T1 and is used to control the oil pressure input by the main pump; A travel overflow valve is also provided in the oil inlet switching valve plate, and a P4 port is also provided on the valve plate; an oil return valve plate is provided on one side of the right travel valve plate, and an oil return port T2 is provided on the oil return valve plate; the P4 port is connected to the g2 port of the second two-position three-way reversing valve, and is connected to the oil return port T2 through the travel overflow valve; the P4 port is used for an external throttle valve to flow back to the oil tank to adjust the speed of the travel motor; The rotary valve plate includes a Y-type third three-position six-way reversing valve and a first one-way valve; the g1 port of the second two-position three-way reversing valve is connected to the f5 port of the third three-position six-way reversing valve and is connected to the f4 port of the third three-position six-way reversing valve through the first one-way valve; the f6 port of the third three-position six-way reversing valve is connected to the oil return port T1; the f1 and f3 ports of the third three-position six-way reversing valve are respectively connected to the internal oil ports of the speed regulating valve plate, and the f2 port of the third three-position six-way reversing valve is connected to the internal oil ports c5 and c6 of the propulsion valve plate.

2. The multifunctional combined multi-way reversing valve for a fully hydraulic tunnel drilling rig according to claim 1 is characterized in that: The left travel valve plate and the right travel valve plate are respectively the first three-position six-way reversing valve and the second three-position six-way reversing valve, and both three-position six-way reversing valves are Y-type; working ports A5 and B5 are provided on the left travel valve plate, and working ports A6 and B6 are provided on the right travel valve plate, which are respectively used to connect the left travel motor and the right travel motor; the z1 and z2 ports of the first three-position six-way reversing valve and the t2 port of the second three-position six-way reversing valve are respectively connected to the g2 port of the second two-position three-way reversing valve; the z5 and z6 ports of the first three-position six-way reversing valve are respectively connected to the working ports A5 and B5 in a one-to-one correspondence, and its z4 port is connected to the t1 port of the second three-position six-way reversing valve; the t5 and t6 ports of the second three-position six-way reversing valve are respectively connected to the working ports A6 and B6 in a one-to-one correspondence; the z3 port of the first three-position six-way reversing valve and the t3 port of the second three-position six-way reversing valve are respectively connected to the oil return port T2.

3. The multifunctional combined multi-way reversing valve for a fully hydraulic tunnel drilling rig according to claim 1 is characterized in that: The speed regulating valve plate includes two one-way throttle valves, two secondary relief valves and a shuttle valve. Working ports A1 and B1 are provided on the speed regulating valve plate for connecting the hydraulic motor; the two one-way throttle valves are respectively connected between the f1 port and the working port A1, and between the f3 port and the working port B1 of the third three-position six-way reversing valve; the two secondary relief valves are respectively connected between the working ports A1, B1 and the oil return port T1; the two oil inlets of the shuttle valve are respectively connected to the working ports A1 and B1, and the oil outlet of the shuttle valve is connected to the working port A4 provided on the linkage valve plate through the internal oil channel.

4. The multifunctional combined multi-way reversing valve for a fully hydraulic tunnel drilling rig according to claim 1 is characterized in that: The pressure reducing safety valve plate includes a third two-position three-way reversing valve, a relief valve, an adjustable relief valve, a pressure reducing valve and second and third one-way valves. The internal oil inlet x1 of the pressure reducing safety valve plate is connected to the e3 port of the third two-position three-way reversing valve through the second one-way valve, the e1 port of the third two-position three-way reversing valve is connected to the internal oil outlet x2 of the pressure reducing safety valve plate through the internal oil passage, and the e2 port of the third two-position three-way reversing valve is connected to the working port A4 provided on the linkage valve plate through the internal oil passage; the relief valve and the adjustable relief valve are connected in parallel between the internal oil inlet x1 and the oil return port T1; the pressure reducing valve and the third one-way valve are connected in sequence between the internal oil inlet x1 and the internal oil outlet x2, and the internal oil outlet x2 is connected to the internal oil ports c5 and c6 of the propulsion valve plate.

5. A multifunctional combined multi-way reversing valve for a fully hydraulic tunnel drilling rig according to claim 1 or 4, characterized in that: The propulsion valve plate includes a fourth three-position six-way reversing valve and two overload safety valves, and is provided with working ports A2 and B2 on the valve plate for connecting the propulsion cylinder; the fourth three-position six-way reversing valve is Y-type, and its c1 and c3 ports are respectively connected to the working ports A2 and B2, and the c2 and c4 ports are connected to the return oil port T1; the two overload safety valves are respectively connected between the c1 and c3 ports and the return oil port T1, for providing overload protection for the propulsion cylinder.

6. The multifunctional combined multi-way reversing valve for a fully hydraulic tunnel drilling rig according to claim 5 is characterized in that: The linkage valve plate includes a fourth two-position three-way reversing valve, an O-type three-position four-way reversing valve, a hydraulically controlled one-way valve, a fourth one-way valve and an oil return throttle valve, and working ports A3, A4 and an oil return port T3 are provided on the linkage valve plate; wherein the a1 port of the fourth two-position three-way reversing valve is connected to the working port A3 for an externally connected clamp; its a2 port is connected to the b1 port of the three-position four-way reversing valve and is connected to the working port A4 through the fourth one-way valve, and its a3 port is connected to the working port A4 through an internal oil passage; the b2 port of the three-position four-way reversing valve is connected to the control port of the hydraulically controlled one-way valve through the internal oil passage, and the b3 and b4 ports are connected to the c1 and c3 ports of the fourth three-position six-way reversing valve respectively; the hydraulically controlled one-way valve and the oil return throttle valve are sequentially connected between the working port A4 and the oil return port T3 through the internal oil passage, and are used to control the unloading of the hydraulic chuck connected to the working port A4.

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