CN110778557A - Multi-way reversing valve of multifunctional tunnel drilling machine - Google Patents
Multi-way reversing valve of multifunctional tunnel drilling machine Download PDFInfo
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- CN110778557A CN110778557A CN201911113859.2A CN201911113859A CN110778557A CN 110778557 A CN110778557 A CN 110778557A CN 201911113859 A CN201911113859 A CN 201911113859A CN 110778557 A CN110778557 A CN 110778557A
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- 238000005553 drilling Methods 0.000 title claims description 35
- 230000007935 neutral effect Effects 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 8
- 239000003921 oil Substances 0.000 description 361
- 230000001276 controlling effect Effects 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000010720 hydraulic oil Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000000243 solution Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/10—Slips; Spiders ; Catching devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/18—Connecting or disconnecting drill bit and drilling pipe
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- Environmental & Geological Engineering (AREA)
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- General Engineering & Computer Science (AREA)
- Earth Drilling (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
A multi-way reversing valve of a multifunctional underground drill rig comprises an oil inlet valve plate, a rotary valve plate, a shuttle valve plate, a feeding valve plate and a switching valve plate; the switching valve plate comprises a third reversing valve, a fourth reversing valve, a differential oil cylinder and a one-way valve; a clamping oil port A3, a loosening oil port B3 and a chuck oil port A4; the P port of the third reversing valve is communicated with a clamping oil port A3, the P 'ports and the P' ″ ports of the third reversing valve are respectively communicated with control oil ports at two ends of the fourth reversing valve correspondingly, the A port of the third reversing valve is communicated with the A port of the second reversing valve arranged in the feeding valve slice, and the B port of the third reversing valve is communicated with a working oil port A1 through a check valve; the fourth reversing valve is a three-position five-way hydraulic control reversing valve, a port P of the fourth reversing valve is communicated with an oil outlet A of the shuttle valve, a port A of the fourth reversing valve is communicated with a chuck oil port A4, and ports A' and B of the fourth reversing valve are respectively correspondingly communicated with a clamping oil port A3 and a loosening oil port B3; the differential oil cylinder is arranged at one end of a control oil port of the fourth reversing valve, and a rodless cavity oil port L of the differential oil cylinder is communicated with a working oil port B1. The valve has simple structure and simple and convenient operation, and can improve the working efficiency.
Description
Technical Field
The invention relates to a multi-way reversing valve, in particular to a multi-way reversing valve of a multifunctional underground drill rig.
Background
The tunnel drilling machine is a drilling machine for drilling in an underground tunnel, and is mainly used for engineering construction of deep geological exploration, gas drainage, water injection and drainage, ventilation and the like in the tunnel. The main structure is as follows: the power head provided with the hydraulic chuck is connected with the feeding oil cylinder, the holder consists of two semicircular slips, one slip is fixed, the other slip can move, and the two slips are pressed together under the action of the disc spring. The working mode is as follows: the multi-way valve rotates the handle to change direction, the power head rotates to enable the hydraulic chuck to clamp the drill rod to rotate, meanwhile, two slips of the clamp holder are opened, the drill rod is loosened, the handle is pushed forward to change direction, the power head advances under the action of the pushing oil cylinder to drill; after a drill rod is driven in, the handle is pushed back to the middle position, the power head stops advancing, the handle is rotated back to the middle position, the power head stops rotating, and the two slips of the clamp holder clamp the driven drill rod to prevent the drill rod from falling. And a drill rod is additionally arranged at the tail part of the drill rod, the push handle is pulled backwards for reversing, the hydraulic chuck is loosened, the power head is retreated to the tail part, and the drill is circularly drilled by continuously additionally arranging the drill rod. The clamping and the opening of the chuck and the clamping and the opening of the clamper are controlled by a control valve group.
The conventional drilling multi-way valve has the problem that a drill rod slides down in the drilling process, the reason is that a power head starts to rotate, a chuck and a clamp holder act simultaneously, the chuck needs a stroke when being clamped from loosening, the clamp holder is changed from clamping into loosening, the drill rod can be immediately loosened, and the drill rod can slide down for a certain distance in the time difference to cause danger.
The chinese utility model patent publication No. CN207246144U discloses a double-tight multichannel reversing valve for tunnel drilling machine, which comprises an oil inlet valve plate, a rotary valve plate, a shuttle valve plate, a feed valve plate and a switching valve plate which are connected in sequence; the oil inlet valve plate is used for connecting a main pump of the tunnel drilling machine and an oil tank; the rotary valve plate is used for connecting the oil inlet P1 and the oil return port T1 with a forward and reverse oil inlet of a rotary motor of the gallery drilling machine; the feeding valve plate is used for controlling the extension and retraction of the feeding oil cylinder; the switching valve plate comprises a three-position four-way manual reversing valve, a two-position three-way manual reversing valve I, a two-position three-way manual reversing valve II, a two-position three-way hydraulic control reversing valve, a two-position four-way hydraulic control reversing valve, a balance valve and a shuttle valve; the switching valve piece is provided with a feed cylinder pushing oil port A2, a clamp clamping oil port A4, a clamp releasing oil port B4, a chuck oil port A3 and an oil return port T2.
The problems with such a diverter valve are as follows: 1. the switching valve block adopts three manual reversing valves, namely a three-position four-way manual reversing valve, a two-position three-way manual reversing valve I and a two-position three-way manual reversing valve II to control the drilling-up and drilling-down working conditions of the tunnel drilling machine and the actions of the clamp holder and the chuck, the structure is complex, the operation is complex, and the drilling efficiency during operation is influenced; 2. the switching valve block adopts a two-position three-way hydraulic control reversing valve and a two-position four-way hydraulic control reversing valve to respectively cooperate with a two-position three-way manual reversing valve I and a two-position three-way manual reversing valve II to control the actions of a clamp holder and a chuck of the tunnel drilling machine, the structure is complex, the operation is complex, and the operation efficiency is influenced. 3. In addition, the drill rod needs to be connected with a cooling water pipe for water cooling in the drilling process, and the cooling water pipe is connected to the last section of drill rod; when the hydraulic motor starts to rotate forwards, the clamp holder is changed into an open state, so that a drill rod cannot be additionally arranged between the clamp holder and the hydraulic chuck, the drill rod can only be additionally arranged at the lowest end behind the hydraulic chuck, the water pipe which is connected before each drill rod is added needs to be firstly detached, the water pipe is reconnected after the drill rod is additionally arranged, and drilling efficiency is greatly reduced.
Disclosure of Invention
The invention aims to solve the technical problem of providing the multi-way reversing valve of the multifunctional underground drill rig, which has a simple structure and is simple and convenient to operate and capable of improving the operation efficiency, and the valve not only can ensure that a drill rod is always clamped, but also can avoid the drill rod from sliding off; and can realize when the hydraulic motor is unloaded corotation, the holder keeps the clamping state to the realization is installed the drilling rod additional in front of the hydraulic chuck, avoids all demolising the water pipe when adding the drilling rod at every turn.
The technical scheme of the invention is as follows:
a multi-way reversing valve of a multifunctional underground drill rig comprises an oil inlet valve plate, a rotary valve plate, a shuttle valve plate, a feed valve plate and a switching valve plate which are sequentially connected; the oil inlet valve plate is provided with an oil inlet P1 and an oil return port T1 and is used for connecting a main pump and an oil tank of the underground drill rig; the rotary valve plate is used for connecting the oil inlet P1 and the oil return port T1 with a forward and reverse oil inlet of a hydraulic motor of the underground drill rig; the feeding valve plate is used for controlling the extension and retraction of the feeding oil cylinder; it is characterized in that:
the switching valve plate comprises a third reversing valve, a fourth reversing valve, a differential oil cylinder and a one-way valve; a clamping oil port A3, a loosening oil port B3 and a chuck oil port A4 which are arranged on the valve plate;
the third reversing valve is a three-position six-way reversing valve, a P port of the third reversing valve is communicated with the clamping oil port A3 through an internal oil duct, P 'ports and P' ports of the third reversing valve are respectively communicated with control oil ports M, N at two ends of the fourth reversing valve correspondingly, an A port of the third reversing valve is communicated with an A port of a second reversing valve arranged in the feeding valve sheet, and a B port of the third reversing valve is communicated with a working oil port A1 arranged on the rotary valve sheet through the internal oil duct and the check valve; when the pressure of the working oil port A1 is higher than the pressure of the port B of the third reversing valve, the one-way valve is opened; the port P1' of the third reversing valve is communicated with the port B of the second reversing valve; the device is used for selecting the drill-tripping or drill-lowering working condition of the tunnel drilling machine and the adding position of the drill rod;
the fourth reversing valve is a three-position five-way hydraulic control reversing valve, a port P of the fourth reversing valve is communicated with a shuttle valve oil outlet A arranged in a shuttle valve sheet through an internal oil duct, a port A of the fourth reversing valve is communicated with a chuck oil port A4, and a port A' and a port B of the fourth reversing valve are respectively correspondingly communicated with a clamping oil port A3 and a loosening oil port B3; the hydraulic chuck is used for controlling the actions of the clamp and the hydraulic chuck;
the differential oil cylinder is arranged at one end of a control oil port M of the fourth reversing valve, a rod cavity of the differential oil cylinder is communicated with the control oil port M, and a rodless cavity oil port L of the differential oil cylinder is communicated with a working oil port B1 arranged on the rotary valve plate through an internal oil duct; and when the hydraulic motor rotates forwards in an idle state, the fourth reversing valve is in a neutral balance state.
Preferably, the shuttle valve plate comprises a shuttle valve, a sequence valve and an oil inlet P2 for connecting the auxiliary pump of the underground drill rig; two oil inlets S1 and S2 of the shuttle valve are respectively and correspondingly communicated with the oil inlets P1 and P2 through internal oil passages; the sequence valve is connected between the oil inlet P2 and the port P of the second reversing valve through an internal oil passage.
Preferably, a check valve plate is further arranged between the feeding valve plate and the switching valve plate, the check valve plate comprises a double-control balance valve arranged in the valve plate and a working oil port B2 arranged on the valve plate, the port B of the second reversing valve is communicated with a working oil port B2 through the double-control balance valve and an internal oil duct, an internal control oil port K1 of the double-control balance valve is communicated with a working oil port A1 on the rotary valve plate through the internal oil duct, and an internal control oil port K2 of the double-control balance valve is communicated with a working oil port A2 on the feeding valve plate through the internal oil duct.
Further preferably, when the third direction switching valve is at the neutral position, P, P ' and P ' ports thereof are in communication with each other, and A, B, P1 ' ports thereof are blocked, respectively; when the third direction-changing valve 14 is at the upper position, the port P is closed, the port P ' is communicated with the port A, the port P ' is communicated with the port B and is communicated with the port P1 ' through a throttling groove arranged on the valve rod; when the third direction valve 14 is in the lower position, the ports P and B are closed, the port P ' is connected to the port P1 ', and the port P ' is connected to the port a; oil discharged by the fourth reversing valve enters oil cavities at two ends of a valve rod of the fourth reversing valve 15 through the third reversing valve 14 in the middle position, and the fourth reversing valve 15 is in the middle position balance state under the action of equal oil pressure at two ends; the hydraulic chuck is used for realizing that the clamp and the hydraulic chuck are in a clamping state so as to install a drill rod in front of the hydraulic chuck.
Preferably, when the fourth reversing valve is in the neutral position, the port P is respectively communicated with the port A and the port A', and the port B is communicated with the port T; when the fourth reversing valve is positioned at the upper position, the port P is respectively communicated with the port A and the port B, and the port A' is communicated with the port T; when the fourth direction-changing valve is at down position, its P port is communicated with A' port, and its A, B ports are communicated with T port.
Preferably, the rotary valve plate comprises a first reversing valve and working oil ports A1 and B1 arranged on the surface of the valve plate; the first reversing valve is a three-position six-way reversing valve, a P port and a P 'port of the first reversing valve are communicated with each other and are communicated with the oil inlet P1 through an internal oil duct, a T port of the first reversing valve is communicated with the oil return port T1 through the internal oil duct, a A, B port of the first reversing valve is respectively communicated with the working oil ports A1 and B1 through the internal oil duct, and a P1' port of the first reversing valve is communicated with a P port of the second reversing valve through the internal oil duct; the working oil ports A1 and B1 are respectively used for connecting a reverse rotation oil inlet and a forward rotation oil inlet of a hydraulic motor of the underground drill rig.
More preferably, when the first direction valve is at the neutral position, the ports P and P1 'are connected, the ports A, B are connected with the ports T, and the ports P' are disconnected; when the first reversing valve is positioned at an upper position, the port P and the port P1 'are cut off, the port P' is communicated with the port B, and the port A is communicated with the port T; when the first change valve is at lower position, its P port and P1 'port are closed, its P' port and A port are communicated, and its B port and T port are communicated.
Preferably, the feeding valve plate comprises the second reversing valve and a working oil port A2 arranged on the valve plate; the internal structure of the second reversing valve is completely the same as that of the first reversing valve, a port P and a port P 'are communicated with each other, a port T and a port P1' are respectively communicated with the oil return port T1 through an internal oil duct, and a port A is communicated with the working oil port A2 through an internal oil duct; the working oil port A2 is used for connecting a rodless cavity of the feeding oil cylinder.
Preferably, the first, second and third directional control valves are hydraulic directional control valves, and a group of control oil ports are led out from two sides of the rotary valve plate, the feeding valve plate and the switching valve plate respectively and are used for being connected with a pilot valve to control the directional control of the directional control valves.
More preferably, a relief valve is provided between the port P of the second direction switching valve and the oil return port T1 to restrict the oil pressure entering the second direction switching valve.
The invention has the beneficial effects that:
1. the switching valve plate comprises a third reversing valve, a fourth reversing valve, a differential oil cylinder and a one-way valve, the third reversing valve is a three-position six-way reversing valve, and the third reversing valve is used for controlling and selecting the drill-up or drill-down working condition of the tunnel drilling machine and selecting the adding position of a drill rod; the structure is simpler, the operation is simpler and more convenient, and the working efficiency can be effectively improved; the clamp and the hydraulic chuck clamp the drill rod simultaneously when the drilling machine stops rotating; when the power head starts to rotate, the hydraulic chuck is always clamped only by opening the clamp, so that the drill rod is prevented from sliding down when the states of the clamp and the hydraulic chuck are switched.
2. The fourth reversing valve 15 is a three-position five-way hydraulic control reversing valve, a port P of the fourth reversing valve is communicated with an oil outlet A of the shuttle valve 9 through an internal oil duct, a port A of the fourth reversing valve is communicated with a chuck oil port A4 through the internal oil duct, and a port A' and a port B of the fourth reversing valve are respectively and correspondingly communicated with a clamping oil port A3 and a loosening oil port B3 through the internal oil duct; the hydraulic chuck is used for controlling the actions of the clamp and the hydraulic chuck; therefore, the valve can ensure that the drill rod is always clamped by the clamp or the hydraulic chuck, and the drill rod is prevented from sliding off; and the cooperation through third switching-over valve and fourth switching-over valve can realize when the unloaded corotation of hydraulic motor, the holder keeps the clamping state to the realization is installed the drilling rod additional in front of the hydraulic chuck, avoids all demolising the water pipe when adding the drilling rod at every turn, has further improved the operating efficiency.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a bottom view of fig. 1.
Fig. 3 is a left side view of fig. 2.
Fig. 4 is a hydraulic schematic of the present invention.
In the figure: the hydraulic control valve comprises an oil inlet valve plate 1, a rotary valve plate 2, a shuttle valve plate 3, a feeding valve plate 4, a one-way valve plate 5, a switching valve plate 6, a main overflow valve 7, a first reversing valve 8, a shuttle valve 9, a sequence valve 10, an overflow valve 11, a second reversing valve 12, a one-way valve 13, a third reversing valve 14, a fourth reversing valve 15, a double-control balance valve 16, a differential oil cylinder 17, a hydraulic motor 18, a feeding oil cylinder 19, a clamp 20 and a hydraulic chuck 21.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 4, the multi-way reversing valve for the multifunctional underground drill rig comprises an oil inlet valve plate 1, a rotary valve plate 2, a shuttle valve plate 3, a feeding valve plate 4, a check valve plate 5 and a switching valve plate 6 which are sequentially connected through bolts; the oil inlet valve plate 1 is used for connecting oil inlet and total oil return of a main pump; the rotary valve plate 2 is used for connecting a forward oil inlet and a reverse oil inlet of a hydraulic motor 18 of the tunnel drilling machine, so that forward rotation and reverse rotation of the hydraulic motor 18 are controlled; the switching valve plate 6 is used for controlling the clamping and the loosening of a hydraulic chuck 21 and a clamper 20 of the tunnel drilling machine during drilling and tripping, and the feeding valve plate 4 is used for controlling the expansion and contraction of the feeding oil cylinder 19.
The oil inlet valve plate 1 comprises a main overflow valve 7 arranged in the valve plate, and an oil inlet P1 and an oil return port T1 which are arranged on the surface of the valve plate, wherein the oil inlet P1 and the oil return port T1 are respectively used for connecting a main pump and an oil tank of the gallery drilling machine; the main overflow valve 7 is connected between the oil inlet P1 and the oil return port T1 through an internal oil passage arranged in the oil inlet valve plate 1, and is used for preventing the system from being damaged due to overhigh oil pressure entering the system.
The rotary valve plate 2 comprises a first reversing valve 8 arranged in the valve plate and working oil ports A1 and B1 arranged on the surface of the valve plate. The first reversing valve 8 is a three-position six-way reversing valve, a P port and a P 'port of the first reversing valve are communicated with each other and are communicated with the oil inlet P1 through an internal oil duct, a T port of the first reversing valve is communicated with the oil return port T1 through an internal oil duct, a A port and a B port of the first reversing valve are respectively communicated with the working oil ports A1 and B1 through internal oil ducts, and a P1' port of the first reversing valve is communicated with a P port of the second reversing valve 12 arranged in the feeding valve block 4 through an internal oil duct penetrating through the shuttle valve block 3. The working oil ports A1 and B1 are respectively used for connecting a reverse rotation oil inlet and a forward rotation oil inlet of the hydraulic motor 18 of the underground drill rig.
When the first direction valve 8 is at the neutral position, the ports P and P1 'are communicated, the ports A, B are communicated with the ports T, and the ports P' are closed. When the first direction valve 8 is at the upper position, the port P and the port P1 'are cut off, the port P' is communicated with the port B, and the port A is communicated with the port T. When the first direction valve 8 is at the lower position, the port P and the port P1 'are closed, the port P' is communicated with the port a, and the port B is communicated with the port T.
The shuttle valve plate 3 comprises a shuttle valve 9 and a sequence valve 10 which are arranged in the valve plate, and an oil inlet P2 which is arranged on the surface of the valve plate; two oil inlets S1 and S2 of the shuttle valve 9 are respectively and correspondingly communicated with the oil inlets P1 and P2 through internal oil passages, and an oil outlet A of the shuttle valve 9 is communicated with a port P of a fourth reversing valve 15 arranged in the switching valve plate 6 through the internal oil passages. The oil inlet P2 is used for connecting an auxiliary pump of a tunnel drilling machine; the sequence valve 10 is connected between the oil inlet P2 and the port P of the second reversing valve of the feed valve plate 4 through an internal oil passage, and when the oil pressure of the oil inlet P2 reaches a certain pressure, the sequence valve 10 is pushed open to be communicated with the port P of the second reversing valve, the opening pressure of the sequence valve 10 is 8MPa, and the sequence valve is used for providing oil with a certain pressure for the shuttle valve 9, so that a certain oil pressure is always provided in a clamping oil cavity of the gallery drilling machine clamp 20 to clamp a drill rod, and the drill rod is prevented from sliding down.
The feeding valve plate 4 comprises a second reversing valve 12 arranged in the valve plate, and a working oil port A2 and a speed regulating port K which are arranged on the valve plate. The second reversing valve 12 is a three-position six-way reversing valve, the internal structure of the second reversing valve is completely the same as that of the first reversing valve 8, a port P and a port P 'are communicated with each other, a port T and a port P1' are respectively communicated with the oil return port T1 through an internal oil duct, a port A is communicated with the working oil port A2 through the internal oil duct, and a port B is communicated with the double-control balance valve 16 arranged in the one-way valve plate 5 through the internal oil duct. The working oil port A2 is used for connecting a rodless cavity of the feeding oil cylinder 19; the speed regulating port K is communicated with a port B of the second reversing valve 12 through an internal oil passage and is used for regulating the speed of the feeding oil cylinder 19 by an external throttle valve.
The check valve plate 5 comprises a double-control balance valve 16 arranged in the valve plate and a working oil port B2 arranged on the valve plate. The working oil port B2 is communicated with the port B of the second directional valve 12 through the double control balance valve 16 and the internal oil passage, and is used for connecting the rod cavity of the feed cylinder 19. The double-control balance valve 16 is a balance valve with two internal control oil ports K1 and K2, an internal control oil port K1 of the double-control balance valve is communicated with a working oil port a1 on the rotary valve plate 2 through an internal oil duct, and an internal control oil port K2 of the double-control balance valve is communicated with a working oil port a2 on the feed valve plate 4 through an internal oil duct, and the internal control oil ports K2 and the working oil port a2 are respectively used for controlling the opening of.
The switching valve plate 6 comprises a third reversing valve 14, a fourth reversing valve 15, a differential oil cylinder 17 and a one-way valve 13 which are arranged in the valve plate, and a clamping oil port A3, a loosening oil port B3, a chuck oil port A4 and an oil return port T2 which are arranged on the valve plate. The clamping oil port A3 and the loosening oil port B3 are respectively used for connecting a clamping cavity oil port and a loosening cavity oil port of the gripper 20; the chuck oil port A4 is used for connecting an oil inlet cavity of the hydraulic chuck 21; oil return port T2 is used to connect to a tank to allow the hydraulic chuck 21 and clamp 20 to release oil.
The third reversing valve 14 is a three-position six-way reversing valve, a P port of the third reversing valve is communicated with the clamping oil port A3 through an internal oil passage arranged in the switching valve plate 6, a P 'port and a P' port of the third reversing valve are respectively communicated with two control oil ports M, N of the fourth reversing valve 15 through the internal oil passage, an a port of the third reversing valve is communicated with an a port of the second reversing valve 12 through the internal oil passage, a B port of the third reversing valve is communicated with an a port of the first reversing valve 8, namely a working oil port a1 through the internal oil passage and the check valve 13, and when the pressure of the a port of the first reversing valve 8 is higher than that of the B port of the third reversing valve 14, the check valve 13 is opened, so that the B port of the third reversing valve 14 can be supplied with oil through the; otherwise the non-return valve 13 is blocked. The port P1' of the third direction valve 14 is communicated with the port B of the second direction valve 12 through an internal oil passage; the device is used for controlling and selecting the pulling-out working condition or the pulling-down working condition of the underground drill rig and selecting the adding position of the drill rod.
When the third direction valve 14 is at the neutral position, P, P ' and P ' ports thereof are in communication with each other, and A, B, P1 ' ports thereof are blocked, respectively; when the third direction-changing valve 14 is at the upper position, the port P is closed, the port P ' is communicated with the port A, the port P ' is communicated with the port B and is communicated with the port P1 ' through a throttling groove arranged on the valve rod; when the third direction valve 14 is in the lower position, ports P and B are closed, port P ' is connected to port P1 ', and port P ' is connected to port a.
The fourth reversing valve 15 is a three-position five-way hydraulic control reversing valve, a port P of the fourth reversing valve is communicated with an oil outlet A of the shuttle valve 9 through an internal oil duct, a port T of the fourth reversing valve is communicated with an oil return port T2, a port A of the fourth reversing valve is communicated with a chuck oil port A4 through the internal oil duct, and a port A' and a port B of the fourth reversing valve are respectively and correspondingly communicated with a clamping oil port A3 and a loosening oil port B3 through the internal oil duct; for controlling the action of the gripper and the hydraulic chuck.
When the fourth reversing valve 15 is in the middle position, the port P is respectively communicated with the port A and the port A', and the port B is communicated with the port T; when the fourth reversing valve 15 is at the upper position, the port P is respectively communicated with the port A and the port B, and the port A' is communicated with the port T; when the fourth direction valve 15 is at the lower position, the port P is connected to the port a', and the ports a and B are connected to the port T.
The two control oil ports M, N are respectively provided at two ends of a valve rod of the fourth direction valve 15, and are used for controlling the direction change of the fourth direction valve 15. The differential oil cylinder 17 is arranged at one end of a control oil port M of the fourth reversing valve 15, a rod cavity of the differential oil cylinder 17 is communicated with the control oil port M through a cavity at one end of a valve rod of the fourth reversing valve 15, and an oil port L of a rodless cavity of the differential oil cylinder 17 is communicated with the working oil port B1 through an internal oil duct; when the hydraulic motor is used for realizing the no-load forward rotation of the hydraulic motor, the fourth reversing valve 15 is in a neutral balance state, so that the hydraulic chuck and the holder are simultaneously kept in a clamping state, and the drill rod is additionally arranged in front of the hydraulic chuck.
The first reversing valve, the second reversing valve and the third reversing valve are respectively hydraulic control reversing valves, a group of control oil ports a1 and b1 are led out from two sides of the rotary valve plate of the first reversing valve, a group of control oil ports a2 and b2 are led out from two sides of the feed valve plate of the second reversing valve, and a group of control oil ports a3 and b3 are led out from two sides of the switching valve plate of the third reversing valve and are respectively used for being connected with pilot valves to control reversing of the first reversing valve, the second reversing valve and the third reversing valve. A relief valve is connected between the port P of the second direction valve 12 and the oil return port T1 through an internal oil passage to restrict the oil pressure entering the second direction valve 12.
When the underground drill rig is in a stop state in the working process, the first reversing valve 8, the second reversing valve 12, the third reversing valve 14 and the fourth reversing valve 15 are all in neutral positions, at the moment, the hydraulic motor 18 stops rotating, and the feeding oil cylinder 19 stops moving. The hydraulic oil of the main pump enters from an oil inlet P1, passes through the first reversing valve 8 and the second reversing valve 12, reaches an oil return port T1 and returns to the oil tank; the auxiliary pump hydraulic oil enters from an oil inlet P2, rises to 8MPa pressure, opens the sequence valve 10, and returns to the oil tank after passing through the second reversing valve 12; the pressure of 8MPa is transmitted to the fourth reversing valve through the shuttle valve 9 and respectively reaches the two control oil ports M, N of the fourth reversing valve 15 through the third reversing valve, at the moment, the fourth reversing valve 15 is in a middle position due to the fact that the pressures of two ends of the valve rod are equal, meanwhile, hydraulic oil discharged through the fourth reversing valve 15 respectively enters a clamping oil cavity of the hydraulic clamp holder 20 and the hydraulic chuck 21 through the clamping oil port A3 and the chuck oil port A4, the hydraulic clamp holder 20 and the hydraulic chuck 21 respectively clamp the drill rod strongly, and the drill rod can be effectively prevented from slipping.
When the drilling state is entered, if a drill rod adding mode is adopted, the third reversing valve 14 is switched to the upper position through the corresponding pilot valve; the first reversing valve 8 is switched to the upper position through the corresponding pilot valve, the main pump oil drives the hydraulic motor 18 to rotate forward through the first reversing valve 8, and meanwhile, the oil reaching the working oil port B1 reaches the rodless cavity oil port L of the differential oil cylinder 17 through the internal oil passage to push the cylinder rod of the differential oil cylinder 17 to move downwards, so that the fourth reversing valve 15 is pushed to reverse to the upper position; the pressure oil at the shuttle valve oil outlet A respectively reaches a release oil port B3 and a chuck oil port A4 through a fourth reversing valve 15, so that the clamp 20 is released, and simultaneously the hydraulic chuck 21 clamps the drill rod to start forward rotation. And then the second reversing valve 12 is switched to the upper position through the corresponding pilot valve, the sequence valve 10 is opened by the oil of the auxiliary pump, the oil sequentially flows through the second reversing valve 12 and the double-control balance valve 16 to reach the working oil port B2 and enters the rod cavity of the feeding oil cylinder 19, so that the feeding oil cylinder 19 drives the rotating drill rod to advance to realize drilling.
When the feed cylinder 19 advances to the maximum stroke, the second direction changing valve 12 is returned to the neutral position by the corresponding pilot valve, and the feed cylinder 19 stops advancing while the first direction changing valve 8 is returned to the neutral position, so that the hydraulic motor 18 stops rotating. At the moment, the rodless cavity oil port L of the differential oil cylinder 17 realizes pressure release through the first reversing valve 8, the fourth reversing valve 15 automatically returns to the middle position under the action of an internal return spring, so that the gripper 20 clamps the drill rod, and the tail part of the drilled drill rod is screwed and additionally provided with a drill rod; then the second reversing valve 12 is switched to the lower position, oil entering from the oil inlet P1 passes through the first reversing valve 8, enters from the oil inlet P2, passes through the sequence valve 10, is converged, flows through the second reversing valve 12, reaches the working oil port a2 and enters the rodless cavity of the feed cylinder 19, meanwhile, oil output by the second reversing valve 12 flows through the third reversing valve 14 at the upper position, reaches the control oil port N of the fourth reversing valve 15, so that the fourth reversing valve 15 is reversed to the lower position, oil in the hydraulic chuck 21 flows through the fourth reversing valve 15 to the oil return port T2 to return to the oil tank for release, and the hydraulic chuck 21 releases a drill rod; meanwhile, the oil output by the second reversing valve 12 reaches an internal control oil port K2 of the double control balance valve 16, and the double control balance valve is opened, so that the cylinder rod of the feeding oil cylinder 19 extends out to drive the hydraulic chuck 21 to retreat; when the feeding oil cylinder 19 retreats to the maximum stroke, the drilling process is repeated, and the drill rods can be sequentially driven.
When the drilling state is entered, if a drill rod adding mode is adopted, the third reversing valve 14 is manually switched to a middle position; the first reversing valve 8 is switched to the upper position, the main pump oil passes through the first reversing valve 8 to drive the hydraulic motor 18 to rotate forward, the oil reaching the working oil port B1 reaches the rodless cavity oil port L of the differential oil cylinder 17 through the internal oil passage, at the same time, the two control oil ports M, N of the fourth reversing valve 15 are respectively communicated with the oil outlet a of the shuttle valve through the third and fourth reversing valves, namely, the control oil port M is equal to the pressure of the oil outlet a of the shuttle valve, when the pressure of the rodless cavity oil port L is low, the cylinder rod of the differential oil cylinder 17 cannot be pushed to move downwards, at the same time, the hydraulic chuck 21 and the gripper 20 clamp the drill rod at the same time because the fourth reversing valve is in the middle position, and the system. When the pressure of the rodless cavity oil port L rises to be larger than the pressure of the control oil port M, the cylinder rod of the differential oil cylinder 17 is pushed to move downwards, and further the fourth reversing valve 15 is pushed to reverse to the upper position, at the moment, the port A 'of the fourth reversing valve 15 is communicated with the oil return port T2 through the port T, the pressure of the port A' is released, the pressure of the two control oil ports M, N is released, and the rodless cavity oil port L can be reversed only by overcoming the spring force of the lower cavity of the fourth reversing valve 15; the pressure oil at the oil outlet A of the shuttle valve respectively reaches a loosening oil port B3 and a chuck oil port A4 through a fourth reversing valve 15, so that the chuck 20 is loosened and the chuck 21 clamps the drill rod to start forward rotation; and then the second reversing valve 12 is switched to the upper position, the sequence valve 10 is opened by the oil of the auxiliary pump, the oil sequentially flows through the second reversing valve 12 and the double-control balance valve 16 to reach the working oil port B2 and enters the rod cavity of the feeding oil cylinder 19, so that the feeding oil cylinder 19 drives the rotating drill rod to advance.
When the feed cylinder 19 advances to the maximum stroke, the second direction changing valve 12 is switched back to the neutral position, the feed cylinder 19 stops advancing, and the first direction changing valve 8 is switched back to the neutral position, so that the hydraulic motor 18 stops rotating. At the moment, the rodless cavity oil port L of the differential oil cylinder 17 releases pressure through the first reversing valve, and the fourth reversing valve 15 automatically returns to the middle position under the action of an internal return spring, so that the gripper 20 clamps a drill rod; then the first reversing valve 8 is switched to the lower position, the oil liquid of the main pump drives the motor 18 to reversely rotate through the first reversing valve 8, at the moment, the oil port L of the rodless cavity has no pressure, the two control oil ports M, N of the fourth reversing valve 15 are communicated with the oil outlet A of the shuttle valve, and the pressure is equal to the pressure of the oil outlet A of the shuttle valve, so that the pressure of the upper cavity and the lower cavity of the fourth reversing valve 15 are balanced and still in the middle position; causing the hydraulic chuck 21 and the gripper 20 to simultaneously grip the drill rod. Since the last drill rod held by the hydraulic chuck 21 is rotated in the reverse direction by the hydraulic motor 18, the drill rod is released from the previous drill rod.
At this time, the oil output from the port a of the first directional control valve 8 simultaneously enters the internal control oil port K1 through the internal oil passage, so that the double control balance valve 16 is opened, and therefore the feed cylinder 19 is in a floating state, and the feed cylinder 19 automatically retreats while tripping, thereby avoiding damaging the trip. After the front and rear drill rods are tripped, the first reversing valve 8 is switched to the middle position, and the hydraulic motor 18 stops reversing; then the second reversing valve 12 is switched to the lower position, oil entering from the oil inlet P1 is converged at the position P of the second reversing valve by the first reversing valve 8 and oil entering from the oil inlet P2 by the sequence valve 10 and jointly flows through the second reversing valve 12 to enter a rodless cavity of the feeding oil cylinder 19, and simultaneously reaches an internal control oil port K2 to open the double control balance valve 16, so that the feeding oil cylinder 19 drives the hydraulic chuck and the last drill rod clamped by the hydraulic chuck to retreat; in the process, the upper cavity and the lower cavity of the fourth reversing valve 15 are balanced in stress and still in a middle position; that is, the hydraulic chuck 21 holds the last drill rod and retreats, and the holder 20 clamps the front drill rod without sliding.
When the feeding oil cylinder 19 retreats to the maximum stroke, the second reversing valve 12 is switched back to the middle position, so that the feeding oil cylinder 19 stops advancing, and a drill rod is additionally arranged at the tail part of the drill rod clamped by the clamp holder in front of the hydraulic chuck 21; the first reversing valve 8 is switched to the upper position, the main pump oil drives the hydraulic motor 18 to rotate forwards through the first reversing valve 8, and the hydraulic motor 18 can drive the last drill rod to idle under low pressure because the last drill rod clamped by the hydraulic chuck 21 is separated from the previous drill rod at the moment; meanwhile, the oil reaching the working oil port B1 reaches the rodless cavity oil port L of the differential oil cylinder 17 through the internal oil passage, at this time, the two control oil ports M, N of the fourth directional control valve 15 are both communicated with the shuttle valve oil outlet a, i.e., the pressure of the control oil port M is equal to that of the shuttle valve oil outlet a, while the pressure of the oil reaching the rodless cavity oil port L is lower, so that the differential oil cylinder 17 cannot be pushed to move downwards, and therefore the hydraulic chuck 21 and the gripper 20 simultaneously clamp the drill rod. And then the second reversing valve 12 is switched to the upper position, the sequence valve 10 is opened by the oil of the auxiliary pump, the oil sequentially flows through the second reversing valve 12 and the double-control balance valve 16 to reach the working oil port B2 and enters the rod cavity of the feeding oil cylinder 19, so that the feeding oil cylinder 19 drives the rotating drill rod to advance. After the last drill rod clamped by the hydraulic chuck 21 is screwed with the previous drill rod, the system pressure rises, the high-pressure oil reaching the working oil port B1 reaches the rodless cavity oil port L of the differential oil cylinder 17 through the internal oil passage, the upward acting force of the control oil port M on the differential oil cylinder 17 is overcome, the cylinder rod of the differential oil cylinder 17 moves downwards, the fourth reversing valve 15 is pushed to reverse to the upper position, the pressure oil at the oil outlet a of the shuttle valve reaches the loosening oil port B3 through the fourth reversing valve 15 and enters the gripper 20, and the gripper 20 is loosened. When the cylinder rod of the feeding oil cylinder 19 retreats to the maximum stroke, the drilling process is repeated, and the drill rods can be sequentially driven.
When the drill bit enters a drill pulling state, the third reversing valve 14 is switched to a lower straight line conducting position, then the first reversing valve 8 is switched to be positioned at an upper position, main pump oil drives the hydraulic motor 18 to rotate forwards through the first reversing valve 8, meanwhile, the oil reaching the working oil port B1 reaches the rodless cavity oil port L of the differential oil cylinder 17 through the internal oil duct, a cylinder rod of the differential oil cylinder 17 moves downwards, the fourth reversing valve 15 is pushed to reverse to the upper position, pressure oil at the oil outlet A of the shuttle valve respectively reaches the loosening oil port B3 and the disc oil port A4 through the fourth reversing valve 15, the clamp 20 is loosened, and the chuck 21 clamps a drill rod to start rotating forwards; and then the second reversing valve 12 is switched to the lower position, the sequence valve 10 is opened by the oil of the auxiliary pump, the oil sequentially flows through the second reversing valve 12 to reach the working oil inlet A2 and enters the rodless cavity of the feeding oil cylinder 19, meanwhile, the high-pressure oil discharged by the second reversing valve 12 reaches the internal control oil inlet K2, and the double-control balance valve 16 is opened, so that the feeding oil cylinder 19 drives the rotating drill rod to move backwards.
When the feed cylinder 19 retreats to the maximum stroke, the second direction changing valve 12 is switched to the neutral position, the feed cylinder 19 stops retreating, the first direction changing valve 8 is switched back to the neutral position, and the hydraulic motor 18 stops rotating. At the moment, the pressure of a rodless cavity oil port L of the differential oil cylinder 17 is released, and the fourth reversing valve 15 automatically returns to the middle position under the action of an internal return spring, so that the clamp holder 20 clamps a drill rod; then the first reversing valve 8 is switched to the lower position, the hydraulic motor 18 is enabled to rotate reversely, and the last section of drill rod clamped by the hydraulic chuck 21 is driven by the hydraulic motor 18 to rotate reversely, so that the section of drill rod can be tripped from the previous section of drill rod; the oil output by the first reversing valve 8 enters the internal control oil port K1 through the internal oil passage, so that the double control balance valve 16 is opened, the feeding oil cylinder 19 is in a floating state, the feeding oil cylinder 19 automatically retreats while tripping, and the buckle damage is avoided.
When the last section of drill rod is completely disconnected, the first reversing valve 8 is switched to the middle position, and the hydraulic control motor 18 stops rotating; switching the second reversing valve 12 to an upper position, wherein oil entering from an oil inlet P1 passes through the first reversing valve 8, is converged with oil entering from an oil inlet P2 through the sequence valve 10, flows through the second reversing valve 12 and the double-control balance valve 16 together, and enters a rod cavity of the feeding oil cylinder 19 through a working oil port B2; meanwhile, the high-pressure oil discharged by the second reversing valve 12 flows through the third reversing valve 14 at the lower position to reach the control oil port N of the fourth reversing valve, so that the fourth reversing valve 15 is reversed to the lower position, and the oil in the hydraulic chuck 21 flows to the oil return port T2 through the fourth reversing valve 15 and is released by an oil return tank, so that the hydraulic chuck 21 loosens the drill rod; thereby leading the feed oil cylinder 19 to drive the hydraulic chuck to advance; when the feeding oil cylinder 19 advances to the maximum stroke, the drill pulling process is repeated, and the drill rods can be taken out in sequence.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (10)
1. A multi-way reversing valve of a multifunctional underground drill rig comprises an oil inlet valve plate, a rotary valve plate, a shuttle valve plate, a feed valve plate and a switching valve plate which are sequentially connected; the oil inlet valve plate is provided with an oil inlet P1 and an oil return port T1 and is used for connecting a main pump and an oil tank of the underground drill rig; the rotary valve plate is used for connecting the oil inlet P1 and the oil return port T1 with a forward and reverse oil inlet of a hydraulic motor of the underground drill rig; the feeding valve plate is used for controlling the extension and retraction of the feeding oil cylinder; the method is characterized in that:
the switching valve plate comprises a third reversing valve, a fourth reversing valve, a differential oil cylinder and a one-way valve; a clamping oil port A3, a loosening oil port B3 and a chuck oil port A4 which are arranged on the valve plate;
the third reversing valve is a three-position six-way reversing valve, a P port of the third reversing valve is communicated with the clamping oil port A3 through an internal oil duct, P 'ports and P' ports of the third reversing valve are respectively communicated with control oil ports M, N at two ends of the fourth reversing valve correspondingly, an A port of the third reversing valve is communicated with an A port of a second reversing valve arranged in the feeding valve sheet, and a B port of the third reversing valve is communicated with a working oil port A1 arranged on the rotary valve sheet through the internal oil duct and the check valve; when the pressure of the working oil port A1 is higher than the pressure of the port B of the third reversing valve, the one-way valve is opened; the port P1' of the third reversing valve is communicated with the port B of the second reversing valve; the device is used for selecting the drill-tripping or drill-lowering working condition of the tunnel drilling machine and the adding position of the drill rod;
the fourth reversing valve is a three-position five-way hydraulic control reversing valve, a port P of the fourth reversing valve is communicated with a shuttle valve oil outlet A arranged in a shuttle valve sheet through an internal oil duct, a port A of the fourth reversing valve is communicated with a chuck oil port A4, and a port A' and a port B of the fourth reversing valve are respectively correspondingly communicated with a clamping oil port A3 and a loosening oil port B3; the hydraulic chuck is used for controlling the actions of the clamp and the hydraulic chuck;
the differential oil cylinder is arranged at one end of a control oil port M of the fourth reversing valve, a rod cavity of the differential oil cylinder is communicated with the control oil port M, and a rodless cavity oil port L of the differential oil cylinder is communicated with a working oil port B1 arranged on the rotary valve plate through an internal oil duct; and when the hydraulic motor rotates forwards in an idle state, the fourth reversing valve is in a neutral balance state.
2. The multi-purpose underground drill rig multi-way reversing valve of claim 1, wherein: the shuttle valve plate comprises a shuttle valve, a sequence valve and an oil inlet P2 for connecting an auxiliary pump of the tunnel drilling machine; two oil inlets S1 and S2 of the shuttle valve are respectively and correspondingly communicated with the oil inlets P1 and P2 through internal oil passages; the sequence valve is connected between the oil inlet P2 and the port P of the second reversing valve through an internal oil passage.
3. The multi-purpose underground drill rig multi-way reversing valve of claim 2, wherein: the one-way valve plate is further arranged between the feeding valve plate and the switching valve plate and comprises a double-control balance valve arranged in the valve plate and a working oil port B2 arranged on the valve plate, the port B of the second reversing valve is communicated with a working oil port B2 through the double-control balance valve and an internal oil duct, an internal control oil port K1 of the double-control balance valve is communicated with a working oil port A1 on the rotary valve plate through the internal oil duct, and an internal control oil port K2 of the double-control balance valve is communicated with a working oil port A2 on the feeding valve plate through the internal oil duct.
4. The multi-purpose underground drill rig multi-way reversing valve of claim 1, wherein: when the third direction switching valve is in the neutral position, P, P ' and P ' ports of the third direction switching valve are mutually communicated, and A, B, P1 ' ports of the third direction switching valve are respectively closed; when the third direction-changing valve 14 is at the upper position, the port P is closed, the port P ' is communicated with the port A, the port P ' is communicated with the port B and is communicated with the port P1 ' through a throttling groove arranged on the valve rod; when the third direction valve 14 is in the lower position, the ports P and B are closed, the port P ' is connected to the port P1 ', and the port P ' is connected to the port a; the oil discharged by the fourth reversing valve enters oil cavities at two ends of a valve rod of the fourth reversing valve through the third reversing valve in the middle position, so that the fourth reversing valve 15 is in a middle-position balanced state under the action of equal oil pressure at two ends; the hydraulic chuck is used for realizing that the clamp and the hydraulic chuck are in a clamping state so as to install a drill rod in front of the hydraulic chuck.
5. The multi-purpose underground drill rig multi-way reversing valve of claim 1 or 4, wherein: when the fourth reversing valve is positioned at the middle position, the port P is respectively communicated with the port A and the port A', and the port B is communicated with the port T; when the fourth reversing valve is positioned at the upper position, the port P is respectively communicated with the port A and the port B, and the port A' is communicated with the port T; when the fourth direction-changing valve is at down position, its P port is communicated with A' port, and its A, B ports are communicated with T port.
6. The multi-purpose underground drill rig multi-way reversing valve of claim 1 or 3, wherein: the rotary valve plate comprises a first reversing valve and working oil ports A1 and B1 arranged on the surface of the valve plate; the first reversing valve is a three-position six-way reversing valve, a P port and a P 'port of the first reversing valve are communicated with each other and are communicated with the oil inlet P1 through an internal oil duct, a T port of the first reversing valve is communicated with the oil return port T1 through the internal oil duct, a A, B port of the first reversing valve is respectively communicated with the working oil ports A1 and B1 through the internal oil duct, and a P1' port of the first reversing valve is communicated with a P port of the second reversing valve through the internal oil duct; the working oil ports A1 and B1 are respectively used for connecting a reverse rotation oil inlet and a forward rotation oil inlet of a hydraulic motor of the underground drill rig.
7. The multi-purpose underground drill rig multi-way reversing valve of claim 6, wherein: when the first reversing valve is positioned at the middle position, the P port of the first reversing valve is communicated with the P1 ', the A, B ports of the first reversing valve are communicated with the T port, and the P' port of the first reversing valve is closed; when the first reversing valve is positioned at an upper position, the port P and the port P1 'are cut off, the port P' is communicated with the port B, and the port A is communicated with the port T; when the first change valve is at lower position, its P port and P1 'port are closed, its P' port and A port are communicated, and its B port and T port are communicated.
8. The multi-purpose underground drill rig multi-way reversing valve of claim 3, wherein: the feeding valve plate comprises the second reversing valve and a working oil port A2 arranged on the valve plate; the internal structure of the second reversing valve is completely the same as that of the first reversing valve, a port P and a port P 'are communicated with each other, a port T and a port P1' are respectively communicated with the oil return port T1 through an internal oil duct, and a port A is communicated with the working oil port A2 through an internal oil duct; the working oil port A2 is used for connecting a rodless cavity of the feeding oil cylinder.
9. The multi-purpose underground drill rig multi-way reversing valve of claim 7 or 8, wherein: the first reversing valve, the second reversing valve and the third reversing valve are respectively hydraulic control reversing valves, and a group of control oil ports are led out from two sides of the rotary valve plate, the feeding valve plate and the switching valve plate respectively and are respectively used for being connected with a pilot valve to control reversing of the reversing valves.
10. The multi-purpose underground drill rig multi-way reversing valve of claim 8, wherein: a relief valve is provided between port P of the second direction valve and the oil return port T1 to limit the oil pressure entering the second direction valve.
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