A hydraulic axial impactor for core drilling

Abstract

The present invention discloses a hydraulic axial impactor for core drilling, comprising a drill rod connecting sleeve, an upper connecting sleeve, a lower connecting sleeve, a hammer head bottom cap and a vibrating hammer; a water wheel is installed in the working chamber of the water wheel through the water wheel shaft; the inner wall of the upper connecting sleeve is provided with a double-headed left spiral track groove and an impact release groove; the outer axis of the vibrating hammer is symmetrically provided with two groups of left spiral track key blocks; a spring is also provided in the energy conversion chamber, the upper end of the spring abuts in the groove of the spring seat, and the lower end of the spring abuts on the driving assembly installed on the vibrating hammer; a driving groove for placing the driving assembly is provided in the upper center hole of the vibrating hammer; an impact hammer head is installed in the energy release chamber, and the lower end of the impact hammer head extends out of the hammer head bottom cap. The present invention makes full use of the drilling mud power and the drilling rig rotation power, jointly drives the vibrating hammer, and realizes impact rotary drilling. The present invention has the advantages of simple structure, stable operation, and improved drilling efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of engineering geological survey and drilling, in particular to a hydraulic axial impactor for core drilling. Background Art

[0002] Engineering geological drilling is an important means of engineering investigation, and its purpose is to ascertain the underground engineering geology and hydrogeology. With the construction of large-scale projects such as railways and urban transportation, a large number of engineering geological drilling tasks are required every year. Depending on the drilling purpose, quality requirements and formation conditions, different drilling methods can be used. Impact rotary drilling is a drilling method that uses longitudinal impact force and rotary cutting force to break rock and soil on the basis of the drill bit being subjected to a certain static load. This method can greatly improve drilling efficiency. The impact load is usually provided by an impactor installed above the core barrel. The impactor is a key component of impact rotary drilling and there are many types. Currently, according to the different power used, it is divided into hydraulic impactors, pneumatic impactors and mechanical impactors.

[0003] Hydraulic impactors use high-pressure water or mud as their power medium and are also known as "hydraulic hammers." Pneumatic impactors use compressed air as their power medium and are also known as pneumatic "down-the-hole hammers." Mechanical impactors use some kind of mechanical motion to move the hammer up and down to generate impact force. In engineering geological core drilling, hydraulic impactors require a high-pressure water pump or high-pressure mud pump, while pneumatic impactors require a high-pressure air compressor. Mechanical impactors have poor operating stability and are complex to operate, making it difficult to ensure core quality. For this reason, carbide and diamond rotary drilling tools are usually used instead of impact rotary drilling tools.

[0004] The prior art discloses a hydraulic oscillating axial impactor, with publication number CN110905399. This hydraulic oscillating axial impactor utilizes mud fed during drilling to drive a rotating shaft with blades within a housing. A track key is provided on the outer wall of the rotating shaft, and a hydraulic hammer is provided on the outer wall of the rotating shaft. The hydraulic hammer has a track groove that matches the track key. When the rotating shaft rotates, the track key on the rotating shaft drives the hydraulic hammer to rise and fall along the track groove within the hydraulic hammer, impacting the impact joint, causing the drill bit to generate longitudinal vibration while rotating. If the water pressure and flow rate are insufficient, the hydraulic hammer cannot be driven to operate normally. Therefore, the impactor disclosed in the prior art is not suitable for use in conventional engineering geological drilling with low water pressure and flow rate. Therefore, it is urgent to design a core drilling impactor that achieves impact oscillation based on conventional engineering geological drilling to improve the drilling efficiency of the drilling rig. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention provides a hydraulic axial impactor for core drilling which has a simple structure, stable operation and improved drilling efficiency.

[0006] The present invention is realized as follows: a hydraulic axial impactor for core drilling, comprising a drill rod connecting sleeve (15) connected to a drill rod, a lower end of the drill rod connecting sleeve being threadedly connected to an upper connecting sleeve (8), a lower end of the upper connecting sleeve being threadedly connected to a lower connecting sleeve (4), a lower end of the lower connecting sleeve being threadedly connected to a hammer head bottom cap (2), and a vibrating hammer (5) installed in the upper connecting sleeve; and characterized in that:

[0007] The drill pipe connecting sleeve, the upper connecting sleeve, the lower connecting sleeve and the hammer head bottom cap are connected to form an accommodating chamber that is connected from top to bottom. The accommodating chamber is divided into a water wheel working chamber (A), an energy conversion chamber (B) and an energy release chamber (C) from the drill pipe connecting sleeve to the hammer head bottom cap. A left-handed water wheel (13) in the opposite direction of movement of the drill pipe is installed in the water wheel working chamber via a water wheel shaft (13-1). The water wheel shaft passes through the water wheel lower support (12) and extends downward to the energy conversion chamber. An axial flow channel is provided in the water wheel shaft. A discharge port (13-2) connecting the water wheel working chamber (A) and the axial flow channel is provided on the water wheel shaft below the blades of the left-handed water wheel.

[0008] The inner wall of the upper connecting sleeve (8) is provided with a double-headed left-handed spiral track groove (8-1), and two symmetrical impact release grooves (8-2) penetrating the double-headed left-handed spiral track groove are provided along the axial direction of the upper connecting sleeve; the outer circumference of the vibrating hammer (5) is symmetrically provided with two groups of double-headed left-handed spiral track key blocks (5-1) that cooperate with the double-headed left-handed spiral track groove, and the width of the double-headed left-handed spiral track key blocks is smaller than the width of the impact release groove;

[0009] A spring (10) is also provided in the energy conversion chamber. The spring is sleeved on the water wheel shaft. The upper end of the spring abuts against the groove of the spring seat (11), and the lower end of the spring abuts against the vibration hammer. The vibration hammer is provided with a center hole (5-2) along the center direction. A driving groove (5-3) is provided in the upper center hole of the vibration hammer. A driving assembly (3) is provided in the driving groove. The driving assembly is connected to the water wheel shaft. The driving assembly (3) drives the vibration hammer to perform a left rotation motion.

[0010] An impact hammer head (1) is installed in the energy release chamber, the lower end of the impact hammer head protrudes from a hammer head bottom cap (2), a spline (1-1) is provided on the upper outer circumference of the impact hammer head (1) along the axial direction, and the spline of the impact hammer head is in sliding engagement with a keyway (4-1) provided on the lower inner wall of the lower connecting sleeve (4).

[0011] Preferably, the upper part of the water wheel is mounted on the water wheel upper support (14), the outer edge of the water wheel upper support (14) is provided with a water hole (14-1), the lower part of the water wheel is mounted on the water wheel lower support (12), and the water wheel lower support is mounted on the water wheel shaft through a bearing.

[0012] Preferably, a first GS stepped sealing component (18-1) is installed between the water wheel lower support and the water wheel shaft, and a first sealing ring (18-2) is provided between the water wheel lower support and the drill pipe connecting sleeve.

[0013] Preferably, the left-handed water wheel has 6-8 blades.

[0014] Preferably, the total area of ​​the water holes (14-1) provided on the outer edge of the support on the water wheel is 15-20% of the inner diameter cross-sectional area of ​​the water wheel working chamber.

[0015] Preferably, the driving assembly (3) comprises two driving wheels (17) mounted on the outer wall of the water wheel shaft and corresponding to the driving grooves of the vibrating hammer (5), and the driving wheels are vertically mounted on the water wheel shaft through a support shaft (16).

[0016] Preferably, the driving assembly (3) includes a driving bracket (7) installed in the driving groove, a hollow connecting rod (6) is installed in the driving bracket, a locking cover (9) is installed on the upper end surface of the driving bracket through a fastener, the locking cover (9) is screwed on the lower end of the water wheel shaft, a second sealing ring (18-3) is provided between the connecting rod and the water wheel shaft, and a support shaft (16) is symmetrically provided on the outer circumference of the driving bracket, and a driving wheel (17) is installed on the support shaft.

[0017] Preferably, a variable diameter flow passage is provided at the center of the impact hammer head, wherein the large diameter end is located at the upper part, the lower end of the connecting rod (6) or the water wheel shaft (13-1) is inserted into the large diameter end, and a second GS stepped sealing component (19) is installed in the flow passage at the large diameter end and is in sealing contact with the connecting rod or the water wheel shaft.

[0018] Preferably, a dustproof sealing ring (20) and a third GS stepped sealing component (21) are provided between the impact hammer head and the hammer head bottom cap.

[0019] Preferably, the two groups of trajectory key blocks (5-1) and the impact release grooves (8-2) are symmetrically distributed.

[0020] The advantages and technical effects of the present invention are as follows:

[0021] Because the present invention adopts the above-mentioned technical solution, it fully utilizes the power of drilling mud and the rotary power of the drilling rig to jointly drive the vibratory hammer, enabling conventional engineering geological drilling to achieve impact rotary drilling without adding other equipment, thereby improving drilling efficiency. In addition, the present invention has the following technical advantages.

[0022] Compared with the prior art, the present invention uses a water wheel lower support to effectively separate the left-hand water wheel and the impact hammer, which ensures the stability of the water wheel shaft operation on the one hand and prevents drilling mud from directly acting on the impact hammer on the other hand. In addition, compared with the prior art, the present invention arranges the rotation track groove and the track key block on the inner wall of the upper connecting sleeve and the outer wall of the vibrating hammer, which greatly increases the energy storage stroke.

[0023] The present invention effectively separates the water wheel installation working chamber from the energy conversion chamber and the energy release chamber by adding a sealing design, thereby preventing mud from corroding the energy conversion chamber and the energy release chamber and extending the service life of the impactor; the waterway design of the present invention ensures a smooth water flow during drilling, which is beneficial to ensuring the quality of the drilled core; the impact hammer is externally provided with two groups of multi-head track key blocks, which cooperate with the spiral track groove in the upper connecting sleeve, which is beneficial to the lifting of the impact hammer and ensures the stability of operation; the symmetrical driving wheel on the water wheel shaft reduces the friction with the impact hammer, which is beneficial to the lifting and falling of the impact hammer.

[0024] The existing technology requires a higher water pressure, otherwise the hammer cannot be moved up and down. The present invention uses the combined action of the rotational torque of the water wheel and the drill pipe to drive the vibration hammer to move, and can also achieve impact at a lower water pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural diagram of Example 1 of the present invention;

[0026] Figure 2 This is a cross-sectional view of the upper connecting sleeve structure of the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of the vibrating hammer of the present invention;

[0028] Figure 4 Schematic diagram of the drive wheel installation structure;

[0029] Figure 5 This is a schematic diagram of the structure of the driving wheel and the vibrating hammer;

[0030] Figure 6 It is a structural diagram of embodiment 2 of the present invention.

[0031] 1. Impact hammer head; 1-1. Spline; 2. Hammer head bottom cap; 3. Drive assembly; 4. Lower connecting sleeve; 4-1. Keyway; 5. Vibrating hammer; 5-1. Track key block; 5-2. Center hole; 5-3. Drive slot; 6. Connecting rod; 7. Drive bracket; 8. Upper connecting sleeve; 8-1. Left spiral track slot; 8-2. Impact release slot; 8-3. Exhaust hole; 9. Locking cover; 10. Spring; 11. Spring seat; 12. Water wheel lower support; 13. Left Water wheel; 13-1, water wheel shaft; 13-2, discharge port; 13-3, axial flow channel; 13-4, blade; 14, water wheel upper support; 14-1, water hole; 15, drill pipe connecting sleeve; 16, support shaft; 17, driving wheel; 18-1, first GS stepped sealing component; 18-2, first sealing ring; 18-3, second sealing ring; 19, second GS stepped sealing component; 20, dustproof sealing ring; 21, third GS stepped sealing component. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] Example 1, please refer to Figures 1 to 5 A hydraulic axial impactor for core drilling includes a drill pipe connecting sleeve 15 connected to a drill pipe, the drill pipe connecting sleeve serving as a link between the upper and lower parts; the lower end of the drill pipe connecting sleeve is threadedly connected to an upper connecting sleeve 8, the lower end of the upper connecting sleeve is threadedly connected to a lower connecting sleeve 4, and the lower end of the lower connecting sleeve is threadedly connected to a hammer head bottom cap 2, and further includes a vibrating hammer 5 installed in the upper connecting sleeve to generate an impact force in the axial direction and an impact hammer 1 that receives the impact force of the vibrating hammer 5;

[0034] The drill pipe connecting sleeve, upper connecting sleeve, lower connecting sleeve, and hammer head bottom cap are connected to form an accommodating chamber that is continuous from top to bottom. The accommodating chamber is divided into a water wheel working chamber A, an energy conversion chamber B, and an energy release chamber C from the drill pipe connecting sleeve to the hammer head bottom cap. A left-handed water wheel 13 is installed in the water wheel working chamber via a water wheel shaft 13-1. The water wheel shaft extends downward through the water wheel lower support to the energy conversion chamber. An axial flow channel 13-3 is provided in the water wheel shaft. A discharge port 13-2 communicating with the upper end of the axial flow channel is provided on the water wheel shaft below the left-handed water wheel blades 13-4. , ensuring that the water in the working chamber of the water wheel passes through the water wheel blades and then flows into the axial flow channel in the water wheel through the discharge port; in the actual assembly process, in order to avoid the formation of pressure damping in the sealed chamber during installation, an exhaust hole 8-3 is provided on the side wall of the upper connecting sleeve, and the exhaust hole is connected with the energy conversion chamber and the energy release chamber, so that rapid assembly can be achieved during assembly, and then sealed with a plug after assembly; the above-mentioned left-handed water wheel reverses its left-hand motion under the impact of water force when the drilling rig rotates forward, thereby making the movement direction of the water wheel shaft opposite to the movement direction of the drill pipe.

[0035] The inner wall of the upper connecting sleeve is provided with a double-headed left-handed spiral track groove 8-1, and two symmetrical impact release grooves 8-2 are provided along the axial direction of the upper connecting sleeve and pass through the spiral track groove; the outer circumference of the vibrating hammer 5 is symmetrically provided with two groups of double-headed left-handed spiral track key blocks 5-1, and the width of the double-headed left-handed spiral track key blocks is smaller than the width of the impact release groove. By matching the two groups of multiple double-headed left-handed spiral track key blocks on the vibrating hammer with the two groups of multiple double-headed left-handed spiral track grooves on the connecting sleeve, the ability and stability of the vibrating hammer to lift along the track groove are greatly improved compared with the single track block matching in the prior art, and a heavier vibrating hammer can be configured; ensuring that the double-headed left-handed spiral track key block is quickly released when it moves to the impact release groove 8-2 position; the double-helix structure is adopted to ensure that the double-headed left-handed spiral track key block rises in parallel during the rotational movement, ensuring the stability and stability of the movement and preventing jamming; a spring 10 is also provided in the energy conversion chamber, and the spring serves as an energy storage component for generating impact force; the spring is sleeved on the water wheel shaft, and the upper end of the spring abuts against The groove of the spring seat 11 ensures that the spring has an upper limit; the lower end of the spring is abutted and installed on the vibrating hammer; the vibrating hammer is provided with a center hole 5-2 along the center direction, and a driving groove 5-3 for placing the driving component 3 is provided in the upper center hole of the vibrating hammer; during the left-handed motion of the left-handed water wheel shaft, the vibrating hammer is driven to rotate counterclockwise by the driving component 3, so that the two groups of double-headed left-handed spiral track key blocks outside the vibrating hammer rise along the double-headed left-handed spiral track groove of the upper connecting sleeve that rotates right during drilling, and compress the spring above the vibrating hammer during the rising process. The left spiral trajectory key block rotates to the impact release slot, the vibrating hammer loses its support, and is quickly released under the action of the spring and gravity, generating a downward impact force on the impact hammer head located below the vibrating cone; an impact hammer head 1 is installed in the energy release chamber, and the lower end of the impact hammer head extends out of the hammer head bottom cap 2. The upper outer circumference of the impact hammer head 1 is provided with a spline 1-1 in the axial direction, and the inner wall of the lower connecting sleeve 4 corresponding to the spline of the impact hammer head is provided with a keyway 4-1, to ensure that the impact hammer head makes a linear motion relative to the hammer head bottom cap 2 and transmits the drilling torque.

[0036] In the preferred embodiment of the above technical solution, the upper portion of the water wheel is mounted on the upper water wheel support 14, and the lower portion of the water wheel is mounted on the lower water wheel support 12. The lower water wheel support is mounted on the water wheel shaft via a bearing; this support structure ensures the stability of the water wheel operation. Preferably, a first GS stepped sealing member 18-1 is mounted between the lower water wheel support and the water wheel shaft, and a first sealing ring 18-2 is provided between the lower water wheel support and the drill pipe connecting sleeve; this ensures that water does not enter the energy conversion chamber from the water wheel working chamber, allowing components such as the spring, vibrating hammer, and impact hammer to operate in a sealed environment, thereby ensuring the service life of the spring and vibrating hammer.

[0037] The left-handed water wheel of the present invention has 6-8 blades. As water flows from the drill pipe's central hole (small diameter) to the water wheel's working chamber (large diameter), the pressure of the water flow decreases, and the flow rate is insufficient to propel the water wheel. Therefore, water holes 14-1 are provided on the water wheel's upper support 14, with 3-4 holes corresponding to each of the 6-8 blades. This ensures that water flows through every other blade, thus enabling a circular motion that propels the blades. The total area of ​​the water holes is 15-20% of the inner cross-sectional area of ​​the water wheel's working chamber, ensuring an effective flow area. This allows the left-handed water wheel to rotate even under minimal hydraulic pressure.

[0038] In the preferred embodiment of the above technical solution, the driving assembly 3 includes a driving wheel 17 mounted on the outer wall of the water wheel shaft and corresponding to the driving groove of the vibrating hammer 5. The driving wheel is vertically mounted on the water wheel shaft via a support shaft 16. This structure ensures that mechanical loss is minimized while driving the vibrating hammer to rotate.

[0039] Preferably, a variable-diameter flow passage is provided in the center of the impact hammer head, with the larger-diameter end located at the top. The lower end of the water wheel shaft 13-1 is inserted into the larger-diameter end. A second GS stepped sealing member 19 is installed in the flow passage at the larger-diameter end, sealingly abutting the water wheel shaft. This effectively separates the water wheel working chamber, energy conversion chamber, and energy release chamber, preventing mud from corroding the energy conversion chamber and energy release chamber, and extending the service life of the impactor.

[0040] Preferably, a dustproof sealing ring 20 and a third GS stepped sealing component 21 are provided between the impact hammer head and the hammer head bottom cap to prevent mud from corroding the energy conversion chamber and the energy release chamber, thereby extending the service life of the impactor.

[0041] Preferably, the two sets of track key blocks and the impact release groove 8-2 are symmetrically distributed to balance the forces and ensure the stability of the up and down movement.

[0042] Example 2, please refer to Figure 6 In this embodiment, the drive assembly 3 includes a drive bracket 7 mounted within a drive slot. A hollow connecting rod 6 is mounted within the drive bracket, with a second sealing ring 18-3 positioned between the connecting rod and the water wheel shaft. A locking gland 9 is mounted on the upper end of the drive bracket via fasteners and is screwed onto the water wheel shaft. A drive wheel 17 is mounted on support shafts symmetrically arranged around the outer circumference of the drive bracket. The remaining structure is identical to that of Example 1.

[0043] The working principle of the present invention is as follows: When the drilling rig is working, the drill pipe rotates forward, driving the impactor, core barrel, and drill bit to rotate clockwise to cut the formation. At the same time, the mud pump drives mud through the drill pipe, impactor, core barrel, and is discharged from the drill bit outlet. The core enters the core barrel through the drill bit. When the mud passes through the impactor, the mud drives the water wheel shaft inside it to drive the left-hand water wheel to reverse. The driving component installed on the water wheel shaft drives the impact hammer to reverse. The two sets of track key blocks on the outer wall of the impact hammer rise along the double-headed reverse spiral track groove on the inner wall of the upper connecting sleeve, and compress the spring above the impact hammer to store energy. When it rises half a circle, that is, when the track key block is in the relative position with the impact release groove, the impact hammer loses its support and falls rapidly under the action of the spring, thereby achieving impact with the impact hammer head, completing an axial impact; then entering the next impact cycle. By providing seals between the lower support and the drill pipe connecting sleeve and the water wheel shaft, as well as between the water wheel shaft and the connecting rod, between the connecting rod and the impact hammer, and between the impact hammer and the hammer head bottom cap, the mud in the water wheel working chamber is discharged through the discharge port through the water wheel shaft, the connecting rod, and the inner cavity of the impact hammer, preventing mud from entering the energy conversion chamber and the energy release chamber, ensuring the normal operation of the internal structure and preventing rust. The drilling mud flows smoothly and does not cause water hammer and damage to the mud pump. The present invention has a compact structure and stable operation, effectively improving the drilling speed.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hydraulic axial impactor for core drilling, comprising a drill pipe connecting sleeve (15) connected to a drill pipe, the lower end of the drill pipe connecting sleeve being threadedly connected to an upper connecting sleeve (8), the lower end of the upper connecting sleeve being threadedly connected to a lower connecting sleeve (4), the lower end of the lower connecting sleeve being threadedly connected to a hammer head bottom cap (2) and a vibrating hammer (5) installed in the upper connecting sleeve; characterized in that: The drill pipe connecting sleeve, the upper connecting sleeve, the lower connecting sleeve and the hammer head bottom cap are connected to form an accommodating chamber that passes through from top to bottom, and the accommodating chamber is divided into a water wheel working chamber (A), an energy conversion chamber (B) and an energy release chamber (C) from the drill pipe connecting sleeve to the hammer head bottom cap; a left-handed water wheel (13) in the opposite direction of the drill pipe movement direction is installed in the water wheel working chamber through a water wheel shaft (13-1); the water wheel shaft passes through the water wheel lower support (12) and extends downward to the energy conversion chamber, an axial flow channel is provided in the water wheel shaft, and a discharge port (13-2) connecting the axial flow channel and the water wheel working chamber is provided on the water wheel shaft below the blades of the left-handed water wheel; The inner wall of the upper connecting sleeve (8) is provided with a double-headed left-handed spiral track groove (8-1), and two symmetrical impact release grooves (8-2) penetrating the double-headed left-handed spiral track groove are provided along the axial direction of the upper connecting sleeve; the outer circumference of the vibration hammer (5) is symmetrically provided with two groups of double-headed left-handed spiral track key blocks (5-1) matching the double-headed left-handed spiral track groove, and the width of the double-headed left-handed spiral track key blocks is smaller than the width of the impact release groove; A spring (10) is also provided in the energy conversion chamber. The spring is sleeved on the water wheel shaft. The upper end of the spring abuts against the groove of the spring seat (11), and the lower end of the spring abuts against the upper end surface of the vibrating hammer. The vibrating hammer is provided with a center hole (5-2) along the center direction. A driving groove (5-3) is provided in the upper center hole of the vibrating hammer. A driving component (3) is provided in the driving groove. The driving component is connected to the water wheel shaft. The driving component (3) drives the vibrating hammer to perform a left rotation motion. An impact hammer head (1) is installed in the energy release chamber, the lower end of the impact hammer head protrudes from a hammer head bottom cap (2), a spline (1-1) is provided on the upper outer circumference of the impact hammer head (1) along the axial direction, and the spline of the impact hammer head is slidably matched with a keyway (4-1) provided on the lower inner wall of the lower connecting sleeve (4).

2. The hydraulic axial impactor for core drilling according to claim 1, characterized in that: The upper part of the water wheel is mounted on the water wheel upper support (14), the outer edge of the water wheel upper support (14) is provided with a water hole (14-1), the lower part of the water wheel is mounted on the water wheel lower support (12), and the water wheel lower support is mounted on the water wheel shaft through a bearing.

3. The hydraulic axial impactor for core drilling according to claim 2, characterized in that: A first GS stepped sealing component (18-1) is installed between the water wheel lower support and the water wheel shaft, and a first sealing ring (18-2) is provided between the water wheel lower support and the drill pipe connecting sleeve.

4. The hydraulic axial impactor for core drilling according to claim 2, characterized in that: The left-handed water wheel has 6 to 8 blades (13-4).

5. The hydraulic axial impactor for core drilling according to claim 4, characterized in that: The total area of ​​the water holes (14-1) provided on the outer edge of the support on the water wheel is 15-20% of the inner diameter cross-sectional area of ​​the water wheel working chamber.

6. The hydraulic axial impactor for core drilling according to claim 1, characterized in that: The driving assembly (3) comprises two driving wheels (17) mounted on the outer wall of the water wheel shaft and corresponding to the driving grooves of the vibrating hammer (5), and the driving wheels are vertically mounted on the water wheel shaft via a supporting shaft (16).

7. The hydraulic axial impactor for core drilling according to claim 1, characterized in that: The driving assembly (3) comprises a driving bracket (7) installed in a driving groove, a hollow connecting rod (6) installed in the driving bracket, a locking gland (9) installed on the upper end surface of the driving bracket via a fastener, the locking gland (9) is screwed onto the lower end of the water wheel shaft, a second sealing ring (18-3) is provided between the connecting rod and the water wheel shaft, and a support shaft (16) is symmetrically provided on the outer circumference of the driving bracket, and a driving wheel (17) is installed on the support shaft.

8. The hydraulic axial impactor for core drilling according to claim 6 or 7, characterized in that: A variable diameter flow passage is provided at the center of the impact hammer head, wherein the large diameter end is located at the upper part, the lower end of the connecting rod (6) or the water wheel shaft (13-1) is inserted into the large diameter end, and a second GS stepped sealing component (19) is installed in the flow passage at the large diameter end to seal against the connecting rod or the water wheel shaft.

9. The hydraulic axial impactor for core drilling according to claim 1, characterized in that: A dustproof sealing ring (20) and a third GS stepped sealing component (21) are provided between the impact hammer head and the hammer head bottom cap.

10. The hydraulic axial impactor for core drilling according to claim 1, characterized in that: The two groups of track key blocks (5-1) and the impact release grooves (8-2) are symmetrically distributed.

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