CN114961617A

CN114961617A - Hydrodynamic core drill

Info

Publication number: CN114961617A
Application number: CN202210901958.2A
Authority: CN
Inventors: 王义红; 薛向宇; 胡郁乐; 尚丽; 姚远; 白进辉; 孙敏; 曹跃华; 武子阳; 郭宏磊
Original assignee: Shaanxi Taihe Intelligent Drilling Co ltd
Current assignee: Shaanxi Taihe Intelligent Drilling Co ltd
Priority date: 2022-07-29
Filing date: 2022-07-29
Publication date: 2022-08-30
Anticipated expiration: 2042-07-29
Also published as: CN114961617B

Abstract

The invention discloses a hydrodynamic core drill, and belongs to the technical field of mining mechanical equipment. This hydrodynamic core drill tool includes drill bit, bores a section of thick bamboo, connecting pipe, sampler barrel and drillstock, still includes: the flow control valve comprises a valve seat, a valve core assembly and a spring, wherein the valve seat is provided with a slide hole, the slide hole is communicated with a water supply device, the side wall of the valve seat is provided with a first through hole, one end of the first through hole is communicated with a pipe hole of a connecting pipe, the other end of the first through hole is communicated with the slide hole, the side wall of the valve core assembly can block the first through hole, one end of the slide hole, far away from the valve core assembly, is provided with a spring seat, the spring seat is provided with a second through hole, and the valve core assembly is used for blocking the communication between the second through hole and the slide hole; and the ball valve is communicated with the sampling cylinder and is driven by water pressure in the pipe hole of the connecting pipe. According to the hydrodynamic core drill, the opening and closing of the flow control valve are controlled by the water pressure of the water supply device, so that sufficient power is provided for the ball valve, the ball valve is ensured to have sufficient torsion, and the ball valve is prevented from being stuck by a mineral sample.

Description

Hydrodynamic core drill

Technical Field

The invention relates to the technical field of mining mechanical equipment, in particular to a hydrodynamic core drill.

Background

Mineral sampling refers to collecting a certain amount of samples from ore bodies, surrounding rocks and mines according to certain specifications or requirements, researching the quality of minerals, technical conditions of ore deposit mining and the like through processing, analysis, testing and evaluation, and providing data basis for evaluating and calculating the reserve of the ore deposit and solving the problems of the geology, mining, geology and the like of the ore deposit. In the sampling of a specimen, attention must be paid to the representativeness, comprehensiveness and systematicness of the specimen. The integrity of the ore sample has a great influence on the analysis, test and identification of the later sample, so that the integrity of the ore sample needs to be ensured when the ore layer is sampled.

In the Chinese invention patent application number: CN202210170691.4 discloses a sealing device for core drill, comprising: the ball valve mechanism comprises a valve seat, a valve core and a sliding sleeve; the trigger mechanism comprises a pressing structure, an energy storage spring and a sliding block, wherein the pressing structure is arranged at one end, far away from the drill bit, of the sampling cylinder, the pressing structure is connected with the energy storage spring, one end of the energy storage spring is connected with the sliding block, the sliding block is arranged in the drilling cylinder, and the sliding block is connected with the valve core. This core drill sealing device, when carrying out the ore deposit sample, when the ore sample gets into the sampler barrel completely, utilizes the elasticity drive trigger mechanism action of trigger mechanism's energy storage spring, comes the intercepting ore sample.

However, the device is limited by the limited power provided by the energy storage spring, and when the hardness of the ore sample is too high, the ball valve mechanism is easy to be stuck by the ore sample due to insufficient torsion.

Disclosure of Invention

The invention aims to overcome the problems in the prior art and provide a hydrodynamic core drill, which controls the opening and closing of a flow control valve by utilizing the water pressure of a water supply device so as to provide enough power for a ball valve and ensure that the ball valve has enough torsion, thereby preventing the ball valve from being stuck by a mineral sample. The drill cylinder can be cooled by water flow provided by the water supply device, and the drill cylinder is prevented from being damaged due to overhigh temperature during feeding.

The invention provides a hydrodynamic core drill, which comprises a drill bit, a drill cylinder, a connecting pipe, a sampling cylinder and a drill handle, and also comprises:

the flow control valve comprises a valve seat, a valve core assembly and a spring, wherein the valve seat is connected with a drill handle, the valve seat is provided with a slide hole, the slide hole is communicated with a water supply device, the valve core assembly is connected with the inner wall of the slide hole in a sealing and sliding manner, the valve core assembly is provided with a hole, the side wall of the valve seat is provided with a first through hole, one end of the first through hole is communicated with a pipe hole of a connecting pipe, the other end of the first through hole is communicated with the slide hole, the side wall of the valve core assembly can block the first through hole, one end of the slide hole, far away from the valve core assembly, is provided with a spring seat, one end of the spring is abutted against the spring seat, the other end of the spring is abutted against the valve core assembly, the spring seat is provided with a second through hole, one end of the second through hole is communicated with a gap between the connecting pipe and a drill barrel, and the valve core assembly is used for blocking the communication between the second through hole and the slide hole;

the ball valve is arranged at one end, close to the drill bit, in the pipe hole of the connecting pipe, the ball valve is communicated with the sampling cylinder, and the ball valve is driven by water pressure in the pipe hole of the connecting pipe.

Preferably, the ball valve comprises a ball valve seat, a ball valve core and a first sliding sleeve, the ball valve seat is arranged in the connecting pipe and connected with the drill bit, the ball valve seat is provided with a third through hole, one end of the third through hole is communicated with the sampling hole of the drill bit, the other end of the third through hole is communicated with the inner cavity of the sampling cylinder, the ball valve core is arranged in the third through hole, the ball valve core is connected with a ball valve rotating shaft, the ball valve rotating shaft is connected with a gear, the first sliding sleeve is in sealing sliding connection with the inner wall of the pipe hole of the connecting pipe, the inner wall of the first sliding sleeve is in sealing sliding connection with the outer wall of the ball valve seat, the side wall of the first sliding sleeve is provided with a rack along the axial direction of the first sliding sleeve, and the rack is in gear tooth joint with the gear.

Preferably, the connecting pipe comprises a first branch pipe and a second branch pipe, one end of the first branch pipe is connected with the drill handle, the other end of the first branch pipe is connected with the liquid distribution valve, one end of the second branch pipe is communicated with the liquid distribution valve, the other end of the second branch pipe is connected with the drill bit, the valve seat is arranged in the first branch pipe, the first through hole is communicated with the pipe hole of the first branch pipe, the first sliding sleeve is connected with the inner wall of the pipe hole of the second branch pipe in a sealing and sliding mode, the liquid distribution valve is provided with a fourth through hole and a fifth through hole, one end of the fourth through hole is communicated with the second through hole, the other end of the fourth through hole is communicated with the gap, one end of the fifth through hole is communicated with the pipe hole of the first branch pipe, and the other end of the fifth through hole is communicated with the pipe hole of the second branch pipe.

Preferably, the case subassembly includes chock and second sliding sleeve, the chock is connected with second sliding sleeve inner wall, second sliding sleeve outer wall with the sealed sliding connection of slide opening inner wall, first through-hole can be blockked by second sliding sleeve lateral wall, the chock leaves with second sliding sleeve inner wall the hole, the chock is used for blocking the intercommunication of second through-hole and slide opening.

Preferably, the chock block is of a drop-shaped structure.

Preferably, the first through hole is detachably connected with a throttling sleeve, the throttling sleeve is provided with a plurality of specifications, and the throttling sleeves with different specifications are provided with sixth through holes with different apertures.

Preferably, the first through hole is provided with an internal thread, the outer wall of the throttling sleeve is provided with an external thread, and the throttling sleeve is in threaded connection with the first through hole through the external thread.

Preferably, the drill handle is provided with a seventh through hole, one end of the seventh through hole is communicated with the water supply device, and the other end of the seventh through hole is communicated with the slide hole.

Compared with the prior art, the invention has the beneficial effects that: according to the hydrodynamic core drill, the opening and closing of the flow control valve are controlled by the water pressure of the water supply device, so that sufficient power is provided for the ball valve, the ball valve is ensured to have sufficient torsion, and the ball valve is prevented from being stuck by a mineral sample. The drill cylinder can be cooled by water flow provided by the water supply device, and the drill cylinder is prevented from being damaged due to overhigh temperature during feeding.

The invention can apply larger power to the valve core of the ball valve, thereby cutting off the mineral sample in the third through hole and preventing the ball valve from being stuck by the mineral sample in the ball valve. Through setting up the liquid separation valve, can shunt high-pressure rivers and low pressure rivers to when operating mode switches, prevent that high-pressure rivers and low pressure rivers from influencing each other. Through setting up chock and second sliding sleeve, utilize the chock to block the second through-hole, prevent that rivers from leaking in the second through-hole, guarantee this device can normal operating. Through setting up the chock into drop shape structure, can reduce the chock to the disturbing of rivers, and then reduce the resistance of chock to rivers. Through setting up the throttle cover of multiple specification, can adjust the drive power that provides the ball valve to satisfy the sampling demand to different hardness ore samples. Through setting up internal thread and external screw thread, will throttle cover and first through-hole in-connection, can make things convenient for throttle cover dismouting and change. Through set up the sixth through-hole on the drillstock, can guarantee that water supply installation can normally supply rivers to the slide-hole in when the drillstock rotates to guarantee the normal operating of this device.

Drawings

FIG. 1 is a schematic main sectional view of the present invention;

FIG. 2 is a schematic left sectional view of the present invention;

FIG. 3 is a schematic structural view of a flow control valve of the present invention;

FIG. 4 is a schematic view of the internal structure of the ball valve of the present invention;

fig. 5 is a schematic view showing an external structure of the ball valve of the present invention.

Description of reference numerals:

101. the drilling tool comprises a drilling head, 102, a drilling barrel, 103, a sampling barrel, 104, a drilling handle, 105, a valve seat, 106, a valve core assembly, 107, a spring, 108, an aperture, 109, a first through hole, 110, a sliding hole, 111, a spring seat, 112, a second through hole, 113, a gap, 114, a connecting pipe, 201, a ball valve seat, 202, a ball valve core, 203, a first sliding sleeve, 204, a third through hole, 205, a sampling hole, 206, a ball valve rotating shaft, 207, a gear, 208, a rack, 301, a first branch pipe, 302, a second branch pipe, 303, a liquid dividing valve, 304, a fourth through hole, 305, a fifth through hole, 401, a plug block, 402, a second sliding sleeve, 501, a throttling sleeve, 502, a sixth through hole and 6, and a seventh through hole.

Detailed Description

Detailed description of the preferred embodimentsthe following detailed description of the present invention, taken in conjunction with the accompanying fig. 1-5, will provide an understanding that the scope of the present invention is not limited by the detailed description. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Example 1:

as shown in fig. 1, 3 and 4, the present invention provides a hydrodynamic core drill, which comprises a drill bit 101, a drill barrel 102, a connecting pipe 114, a sampling barrel 103 and a drill shank 104, and further comprises: the flow control valve comprises a valve seat 105, a valve core assembly 106 and a spring 107, the valve seat 105 is connected with a drill handle 104, the valve seat 105 is provided with a slide hole 110, the slide hole 110 is communicated with a water supply device, the valve core assembly 106 is in sealed sliding connection with the inner wall of the slide hole 110, the valve core assembly 106 is provided with a pore 108, the side wall of the valve seat 105 is provided with a first through hole 109, one end of the first through hole 109 is communicated with the pore of a connecting pipe 114, the other end of the first through hole 109 is communicated with the slide hole 110, the side wall of the valve core assembly 106 can block the first through hole 109, one end of the slide hole 110 far away from the valve core assembly 106 is provided with a spring seat 111, one end of the spring 107 is abutted against the spring seat 111, the other end of the spring 107 is abutted against the valve core assembly 106, the spring seat 111 is provided with a second through hole 112, one end of the second through hole 112 is communicated with the slide hole 110, the other end of the second through hole 112 is communicated with a gap 113 between the connecting pipe 114 and the drill barrel 102, the valve core assembly 106 is used for blocking the communication between the second through hole 112 and the slide hole 110; the ball valve is arranged at one end, close to the drill bit 101, in the pipe hole of the connecting pipe 114, the ball valve is communicated with the sampling cylinder 103, and the ball valve is driven by water pressure in the pipe hole of the connecting pipe 114.

The working principle of example 1 is now briefly described:

the connecting pipe 114 is arranged in the drill barrel 102, the connecting pipe 114 is connected with the drill handle 104, a gap 113 is arranged between the connecting pipe 114 and the drill barrel 102, and the valve seat 105 is arranged in the connecting pipe 114. Initially, the ball valve is in an open state, the drill bit 101 drills by driving the entire drilling tool to drill, and a sample enters the sampling cylinder 103 through the ball valve from the sampling hole 205 of the drill bit 101. At this time, the water supply device is turned on, the water supply device provides low-pressure water flow, the side wall of the valve core assembly 106 blocks the first through hole 109 of the side wall of the valve seat 105 under the elastic force of the spring 107, and the low-pressure water flow enters the gap 113 between the connecting pipe 114 and the drill cylinder 102 after passing through the slide hole 110, the aperture 108 of the valve core assembly 106 and the second through hole 112 of the spring seat 111, thereby cooling the drill cylinder 102. When the whole ore sample enters the sampling cylinder 103, the water supply device converts and provides high-pressure water flow, the high-pressure water flow enters the slide hole 110, at the moment, when the high-pressure water flow passes through the hole 108 of the valve core assembly 106, the pressure difference between two ends of the hole 108 of the valve core assembly 106 is increased, under the action of the pressure difference, the whole valve core assembly 106 slides along the axial direction of the slide hole 110, the spring 107 is extruded at the moment, until the valve core assembly 106 blocks the communication between the second through hole 112 and the slide hole 110, meanwhile, when the valve core assembly 106 slides to the communication between the first through hole 109 and the slide hole 110, the high-pressure water flow enters the pipe hole of the connecting pipe 114 through the first through hole 109, the high-pressure water flow drives the ball valve to be closed, and therefore, the sampling cylinder 103 is closed, and the sampling work of the sample is completed.

The hydrodynamic core drill tool controls the flow control valve to open and close by utilizing the water pressure of the water supply device, so that enough power is provided for the ball valve, the ball valve is ensured to have enough torsion, and the ball valve is prevented from being stuck by a mineral sample. The drill barrel 102 can be cooled by water flow provided by the water supply device, and the drill barrel 102 is prevented from being damaged due to overhigh temperature during feeding.

Example 2:

on the basis of the embodiment 1, in order to enable the valve core of the ball valve to have higher torsion under the driving of water pressure, the cutting force of the ball valve on the ore sample is further enhanced.

As shown in fig. 1, 4 and 5, the ball valve includes a ball valve seat 201, a ball valve core 202 and a first sliding sleeve 203, the ball valve seat 201 is disposed in the connecting pipe 114 and connected to the drill bit 101, the ball valve seat 201 is provided with a third through hole 204, one end of the third through hole 204 is communicated with a sampling hole 205 of the drill bit 101, the other end of the third through hole 204 is communicated with an inner cavity of the sampling tube 103, the ball valve core 202 is disposed in the third through hole 204, the ball valve core 202 is connected to a ball valve rotating shaft 206, the ball valve rotating shaft 206 is connected to a gear 207, the first sliding sleeve 203 is connected to the inner wall of the tube hole of the connecting pipe 114 in a sealing and sliding manner, the inner wall of the first sliding sleeve 203 is connected to the outer wall of the ball valve seat 201 in a sealing and sliding manner, the side wall of the first sliding sleeve 203 is provided with a rack 208 along the axial direction thereof, and the rack 208 is in toothed connection with the gear 207.

When sampling the ore sample, the ore sample enters the sampling tube 103 through the third through hole 204. When the high-pressure water flow is used for driving the ball valve to be closed, the high-pressure water flow in the pipe hole of the connecting pipe 114 drives the first sliding sleeve 203 to slide along the axial direction of the pipe hole of the connecting pipe 114, the rack 208 on the first sliding sleeve 203 drives the gear 207 to rotate, and then the ball valve rotating shaft 206 and the ball valve core 202 are driven to rotate, the water pressure of the high-pressure water flow is increased, and larger power can be applied to the ball valve core 202, so that the valve core of the ball valve has higher torsion, and the cutting force of the ball valve on a mineral sample is further enhanced. Therefore, harder ore samples in the third through hole 204 can be cut off, and the ball valve is further prevented from being stuck by the ore samples in the ball valve.

As a preferred solution, as shown in fig. 1-4, wherein the connecting pipe 114 comprises a first branch pipe 301 and a second branch pipe 302, one end of the first branch pipe 301 is connected with the drill handle 104, the other end of the first branch pipe 301 is connected with a liquid distribution valve 303, one end of the second branch pipe 302 is communicated with the liquid distribution valve 303, the other end of the second branch pipe 302 is connected with the drill bit 101, the valve seat 105 is arranged in the first branch pipe 301, the first through hole 109 is communicated with the pipe hole of the first branch pipe 301, the first sliding sleeve 203 is connected with the inner wall of the pipe hole of the second branch pipe 302 in a sealing and sliding way, the liquid dividing valve 303 is provided with a fourth through hole 304 and a fifth through hole 305, one end of the fourth through hole 304 is communicated with the second through hole 112, the other end of the fourth through hole 304 is communicated with the gap 113, one end of the fifth through hole 305 is communicated with the hole of the first branch pipe 301, and the other end of the fifth through hole 305 is communicated with the hole of the second branch pipe 302. When the water supply device provides low-pressure water flow, the low-pressure water flow passes through the slide hole 110, the aperture 108 of the valve core assembly 106 and the second through hole 112 of the spring seat 111, and then enters the gap 113 between the first branch pipe 301, the second branch pipe 302 and the drill barrel 102 through the fourth through hole 304 of the liquid distribution valve 303, so that the drill barrel 102 is cooled. When the water supply device provides high-pressure water flow, the high-pressure water flow enters the gap 113 between the first branch pipe 301 and the drill barrel 102 through the slide hole 110 and the first through hole 109 and then enters the gap 113 between the second branch pipe 302 and the drill barrel 102 through the fifth through hole 305 of the liquid separating valve 303, so that the first slide sleeve 203 is driven to slide. Through setting up the liquid separating valve 303, can shunt high-pressure rivers and low pressure rivers to when operating mode switches, prevent that high-pressure rivers and low pressure rivers from influencing each other.

Preferably, as shown in fig. 1, the valve core assembly 106 includes a plug 401 and a second sliding sleeve 402, the plug 401 is connected to an inner wall of the second sliding sleeve 402, an outer wall of the second sliding sleeve 402 is in sealed sliding connection with an inner wall of the sliding hole 110, the first through hole 109 can be blocked by a side wall of the second sliding sleeve 402, the plug 401 and the inner wall of the second sliding sleeve 402 leave the aperture 108, and the plug 401 is used for blocking the communication between the second through hole 112 and the sliding hole 110. When high-pressure water enters the sliding hole 110, the high-pressure water flows through the pore 108 between the plug 401 and the inner wall of the second sliding sleeve 402, and then a pressure difference is formed on two sides of the pore 108, so that the second sliding sleeve 402 is driven and slides axially along the sliding hole 110 under the action of the pressure difference, and when the second sliding sleeve 402 slides to the first through hole 109 to be communicated with the sliding hole 110, the plug 401 blocks the second through hole 112 of the spring seat 111. At this time, the high pressure water flows through the first through hole 109 into the pipe hole of the connecting pipe 114, and drives the ball valve to close. Through setting up chock 401 and second sliding sleeve 402 to can utilize chock 401 to block second through-hole 112 when first through-hole 109 communicates with slide opening 110, prevent that rivers from leaking in the second through-hole 112, guarantee this device can normal operating.

As a preferred option, as shown in fig. 1 and 3, the stopper 401 is a drop-shaped structure. By arranging the chock 401 in a drop-shaped configuration, the disturbance of the chock 401 to the water flow can be reduced, and the resistance of the chock 401 to the water flow is reduced.

As a preferable scheme, as shown in fig. 1 and 3, a throttle sleeve 501 is detachably connected to the first through hole 109, the throttle sleeve 501 is provided with multiple specifications, and throttle sleeves 501 with different specifications have sixth through holes 502 with different hole diameters. Through setting up the throttle cover 501 of multiple specification, because throttle cover 501 has the sixth through-hole 502 in different apertures, rivers are when passing through sixth through-hole 502, the pressure differential ratio of sixth through-hole 502 both sides is in inverse proportion with the size in throttle cover 501 aperture, under the certain prerequisite of input water pressure, through chooseing for use the throttle cover 501 in different apertures, obtain different output water pressure, thereby can adjust the drive power that provides the ball valve, in order to satisfy the sampling demand to different hardness ore samples.

Preferably, as shown in fig. 1 and 2, an internal thread is provided in the first through hole 109, an external thread is provided on an outer wall of the throttle sleeve 501, and the throttle sleeve 501 is in threaded connection with the first through hole 109 through the external thread. Through setting up internal thread and external screw thread, be connected throttle cover 501 with 204 in the first through-hole, can make things convenient for throttle cover 501 dismouting and change.

Preferably, as shown in fig. 1 and 2, the drill shank 104 is provided with a sixth through hole 6, one end of the sixth through hole 6 is communicated with the water supply device, and the other end of the sixth through hole 6 is communicated with the slide hole 110. Through set up sixth through-hole 6 on drill shank 104, water supply installation supplies rivers through sixth through-hole 6 to in the slide opening 110, can guarantee when drill shank 104 rotates that water supply installation can normally supply rivers to the slide opening 110 in to guarantee the normal operating of this device.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A hydrodynamic core drill, comprising a drill bit (101), a drill barrel (102), a connecting tube (114), a sampling barrel (103) and a drill shank (104), characterized by further comprising:

the flow control valve comprises a valve seat (105), a valve core assembly (106) and a spring (107), wherein the valve seat (105) is connected with a drill handle (104), the valve seat (105) is provided with a slide hole (110), the slide hole (110) is communicated with a water supply device, the valve core assembly (106) is in sealed sliding connection with the inner wall of the slide hole (110), the valve core assembly (106) is provided with a pore (108), the side wall of the valve seat (105) is provided with a first through hole (109), one end of the first through hole (109) is communicated with a pipe hole of a connecting pipe (114), the other end of the first through hole (109) is communicated with the slide hole (110), the side wall of the valve core assembly (106) can block the first through hole (109), one end of the slide hole (110), which is far away from the valve core assembly (106), is provided with a spring seat (111), one end of the spring (107) is abutted against the spring seat (111), the other end of the spring (107) is abutted against the valve core assembly (106), the spring seat (111) is provided with a second through hole (112), one end of a second through hole (112) is communicated with the slide hole (110), the other end of the second through hole (112) is communicated with a gap (113) between the connecting pipe (114) and the drill cylinder (102), and the valve core assembly (106) is used for blocking the communication between the second through hole (112) and the slide hole (110);

the ball valve is arranged at one end, close to the drill bit (101), in the pipe hole of the connecting pipe (114), communicated with the sampling cylinder (103), and driven by water pressure in the pipe hole of the connecting pipe (114).

2. A hydrodynamic core drill as claimed in claim 1, wherein the ball valve comprises a ball valve seat (201), a ball valve core (202) and a first sliding sleeve (203), the ball valve seat (201) is disposed in the connecting pipe (114) and connected to the drill bit (101), the ball valve seat (201) is provided with a third through hole (204), one end of the third through hole (204) is connected to the sampling hole (205) of the drill bit (101), the other end of the third through hole (204) is connected to the inner cavity of the sampling tube (103), the ball valve core (202) is disposed in the third through hole (204), the ball valve core (202) is connected to a ball valve rotating shaft (206), the ball valve rotating shaft (206) is connected to a gear (207), the first sliding sleeve (203) is connected to the inner wall of the pipe hole of the connecting pipe (114) in a sealing and sliding manner, the inner wall of the first sliding sleeve (203) is connected to the outer wall of the ball valve seat (201) in a sealing and sliding manner, the side wall of the first sliding sleeve (203) is provided with a rack (208) along the axial direction of the first sliding sleeve, and the rack (208) is in gear joint with the gear (207).

3. A hydrodynamic core drill as claimed in claim 2, characterized in that said connecting pipe (114) comprises a first branch pipe (301) and a second branch pipe (302), one end of said first branch pipe (301) is connected to said drill shank (104), the other end of said first branch pipe (301) is connected to a liquid separating valve (303), one end of said second branch pipe (302) is connected to said liquid separating valve (303), the other end of said second branch pipe (302) is connected to said drill bit (101), said valve seat (105) is disposed in said first branch pipe (301), said first through hole (109) is connected to the pipe hole of said first branch pipe (301), said first sliding sleeve (203) is connected to the inner wall of said pipe hole of said second branch pipe (302) in a sealing and sliding manner, said liquid separating valve (303) is provided with a fourth through hole (304) and a fifth through hole (305), one end of said fourth through hole (304) is connected to said second through hole (112), and the other end of said fourth through hole (304) is connected to said gap (113), one end of the fifth through hole (305) is communicated with the pipe hole of the first branch pipe (301), and the other end of the fifth through hole (305) is communicated with the pipe hole of the second branch pipe (302).

4. A hydrodynamic core drill as claimed in claim 1, characterized in that said valve core assembly (106) comprises a plug (401) and a second sliding sleeve (402), said plug (401) is connected with the inner wall of the second sliding sleeve (402), the outer wall of the second sliding sleeve (402) is connected with the inner wall of said sliding hole (110) in a sealing and sliding manner, the first through hole (109) can be blocked by the side wall of the second sliding sleeve (402), said aperture (108) is left on the inner wall of the plug (401) and the second sliding sleeve (402), said plug (401) is used for blocking the communication between the second through hole (112) and the sliding hole (110).

5. A hydrodynamic core drill as claimed in claim 4, characterized in that said chock (401) is of drop-shaped configuration.

6. A hydrodynamic core drill as claimed in claim 1, characterized in that said first through hole (109) is detachably connected with a throttling sleeve (501), said throttling sleeve (501) is provided with a plurality of sizes, and different sizes of throttling sleeves (501) are provided with sixth through holes (502) with different hole diameters.

7. The hydrodynamic core drill as claimed in claim 6, characterized in that the first through-hole (109) is provided with an internal thread, the outer wall of the throttle sleeve (501) is provided with an external thread, and the throttle sleeve (501) is screwed with the first through-hole (109) by means of the external thread.

8. A hydrodynamic core drill as claimed in claim 1, characterized in that said shank (104) is provided with a seventh through hole (6), said seventh through hole (6) being in communication with said water supply means at one end and said seventh through hole (6) being in communication with said slide hole (110) at the other end.