A hard rock pick with double retaining spring structure

Abstract

The invention discloses a hard rock pick with a double retaining spring structure, belonging to the technical field of picks. A hard rock pick with a double retaining spring structure comprises a pick body, the pick body comprises a detachably connected shank and a tooth head, the tooth head and the bottom wall corresponding to the shank are formed with a protruding block protruding outward, and the outer wall of the protruding block is formed with multiple plug-in parts extending outward at equal intervals; a docking groove matched with the bottom wall of the tooth head is formed at the top wall of the shank, and a plug-in groove concave inwardly matched with the protruding block and the multiple plug-in parts is formed at the bottom wall of the docking groove, the protruding block is used to cooperate with the multiple plug-in parts to limit the circumference of the tooth head, and the tooth head and the side walls corresponding to the multiple plug-in parts are provided with locking components. By setting the pick as a detachably connected shank and tooth head, when the tooth head needs to be replaced due to wear or damage, only the tooth head part needs to be replaced without replacing the entire pick, which not only reduces material waste, but also reduces production costs and maintenance costs.

Description

Technical Field

[0001] The invention relates to the technical field of pick cutters, in particular to a hard rock pick cutter with a double clip spring structure. Background Art

[0002] The pick includes a pick shank and a polycrystalline diamond conical tooth brazed on the pick shank. The pick is mainly used on a rotary drilling rig. The rotary drilling rig is widely used in mining, quarrying, hydropower engineering, road construction, smelting and other fields. It is a comprehensive drilling rig with the characteristics of fast hole-making speed, less pollution and strong maneuverability.

[0003] In the prior art, the pick is made by forging, and the tooth head and the shank are an integral whole. The tooth head is easily worn during operation, while the shank is installed on the tooth seat and is covered with a retaining spring on the outside, which is basically wear-free. When the tooth head is severely worn and needs to be replaced, the entire rotary drilling pick needs to be replaced together, which causes a waste of material of the shank part and increases production costs. Summary of the invention

[0004] The invention provides a hard rock pick with a double retaining spring structure, which can overcome certain defects of the prior art.

[0005] A hard rock pick with a double clip structure according to the present invention comprises a pick body, the pick body comprises a detachably connected tooth handle and a tooth head, a convex block protruding outward is formed at the bottom wall corresponding to the tooth head and the tooth handle, and a plurality of plug-in parts extending outward are formed at equal intervals at the outer wall of the convex block;

[0006] A docking groove cooperating with the bottom wall of the tooth head is formed at the top wall of the tooth shank, and an inwardly recessed plug-in groove cooperating with the protrusion and the multiple plug-in parts is formed at the bottom wall of the docking groove. The protrusion is used to cooperate with the multiple plug-in parts to limit the circumference of the tooth head. Locking components are provided on the side walls corresponding to the tooth head and the multiple plug-in parts, and the locking components are used to limit the protrusion.

[0007] Preferably, an inwardly recessed installation groove is formed on the side wall of the plug-in slot, and the locking assembly includes a clamping column slidably arranged in the installation groove, and a first spring is provided between the clamping column and the side wall of the installation groove, and the first spring is used to provide elastic force to keep the clamping column pressed against the inside of the plug-in slot.

[0008] The above structure ensures that after the tooth head is installed in place, the clamping column can automatically and tightly fit on the side wall of the protrusion and the plug-in portion to form a reliable locking effect, thereby enhancing the connection stability between the tooth head and the tooth handle.

[0009] Preferably, a sliding cavity with an opening at one end is formed inside the clamping column, a locking piece with one end passing through the mounting groove and extending into the sliding cavity is provided on the outer wall of the tooth handle, a sliding piece is rotatably provided at the end of the locking piece extending into the sliding cavity, a sliding groove cooperating with the sliding piece is formed on the inner wall of the sliding cavity, the sliding groove is used to limit the sliding piece in the circumferential direction, a baffle is slidably provided at the locking piece, and the baffle is detachably provided at the opening of the sliding cavity.

[0010] By setting a sliding cavity inside the clamping column and setting a locking piece on the outer wall of the tooth handle, as well as the cooperation between the sliding piece and the sliding groove, controllable adjustment of the locking state of the clamping column is achieved, so that the operator can conveniently unlock or lock the clamping column by tightening the locking piece inward or twisting it outward, thereby enhancing the controllability and stability of the locking and further improving the connection strength between the tooth handle and the tooth head.

[0011] It can be understood that when the locking piece is twisted outward, the blocking column can be driven outward through the baffle, thereby disengaging the blocking column from the matching groove and releasing the limit on the tooth head; tightening the locking piece inward can lock the blocking column to prevent the blocking column from rebounding.

[0012] It is understandable that when the locking member does not limit the position of the clamping column, the clamping column can be automatically pre-locked through the cooperation of the spring.

[0013] Preferably, a side wall of the plug-in portion is inwardly recessed to form a docking groove that cooperates with the clamping column, and a guide portion corresponding to the clamping column is formed on the bottom wall of the docking groove.

[0014] Through the above structure, a precise matching space is provided for the clamping column, ensuring that the clamping column can be accurately aligned when inserted into the docking groove.

[0015] The guide portion formed at the bottom wall of the docking groove guides the clamping column, so that when the clamping column is inserted into the docking groove, it can slide smoothly along the guide portion until it reaches a locking position.

[0016] Preferably, an inwardly recessed groove is formed at the bottom wall of the plug-in slot, a second water flow channel is formed at the tooth head and is arranged along the axial direction of the groove and communicates with the groove, an extension column extending into the plug-in slot is formed at the top wall of the second water flow channel, a pressure plate is slidably provided at the outer wall of the extension column, a second spring is provided between the bottom wall of the pressure plate and the top wall of the groove, and the second spring is used for providing elastic force to keep the pressure plate flush with the bottom wall of the plug-in slot.

[0017] Preferably, a through cavity opening downward and communicating with the second water flow channel is formed inside the extension column, and a plurality of through holes for water outlet are formed on the side walls of the through cavity.

[0018] Preferably, an alloy cutter head is provided at the top of the tooth head, a first water flow channel cooperating with the extension column is formed inside the tooth head, and a nozzle penetrating the first water flow channel and arranged in a conical shape is arranged on the side of one end of the tooth head close to the alloy cutter head.

[0019] Among them, the conical nozzle is opened at the lateral position of the front end of the tooth body, which can assist the pick body in breaking rocks to the greatest extent without reducing the strength of the tooth head.

[0020] Preferably, a water inlet cavity that is connected to the first water flow channel and allows the extension column to extend into the water inlet cavity that cooperates with the through hole is formed at the protrusion, and an annular groove is formed at the first water flow channel corresponding to the extension column. A sealing ring is provided in the annular groove, and a stepped boosting cavity for enhancing water pressure is formed at the first water flow channel, wherein the axial height of the water inlet cavity along the tooth head is greater than the diameter of the through hole.

[0021] Among them, when the pressure and flow of the high-pressure water pump are constant, the jet can increase the pressure through the stepped boosting chamber set in the tooth head. The boosted jet can generate high-frequency "water hammer pressure", which can intensify rock crushing and fatigue damage and improve the rock crushing effect.

[0022] Preferably, a positioning portion is formed on the bottom wall of the protrusion and matches with the groove and extends into the groove.

[0023] By arranging a first water flow channel, a nozzle in the tooth head and a second water flow channel in the tooth shank, the high-pressure water jet can pressurize water and deliver it to the nozzle for spraying, thereby assisting the pick body in breaking rocks. It can make full use of the water wedge effect of the rock to expand cracks, and cooperate with the conical nozzle to be opened at the lateral position of the front end of the tooth body. Without reducing the strength of the tooth head, the target distance is reduced. The rock breaking target distance is small, which greatly reduces the force on the pick and improves the life of the pick and the rock breaking efficiency.

[0024] Preferably, an annular groove is formed on the side wall of the docking groove, and a dustproof sheet is provided in the annular groove, and the dustproof sheet is used to cooperate with the outer wall of the tooth head; the tooth shank has a connecting part connected to the tooth seat, and two fixing grooves are formed on the outer wall of the connecting part, and a retaining spring is provided in each of the fixing grooves.

[0025] By providing a dustproof sheet in the annular groove formed on the side wall of the docking groove, dust, gravel and other debris are effectively prevented from entering the docking groove, the sealing and dustproof performance of the docking groove are enhanced, and dust, gravel and other debris are prevented from entering and affecting the sliding between the tooth shank and the tooth head.

[0026] The beneficial effects of the present invention are as follows:

[0027] 1. By setting the pick as a detachably connected shank and tooth head, when the tooth head needs to be replaced due to wear or damage, only the tooth head part needs to be replaced instead of the entire pick, which not only reduces material waste, but also reduces production and maintenance costs;

[0028] 2. By forming a through first water flow channel in the shank and a second water flow channel and a nozzle in the tooth head, when the pick body is breaking rock, the high-pressure water flow impact reduces the force on the pick, thereby improving the life of the pick and the rock breaking efficiency;

[0029] 3. Through the arrangement of the second spring, the water inlet chamber, the extension column and the pressure plate, when rock breaking is in progress, there is water flow at the nozzle to assist, and when rock breaking is not in progress, there is no water flow. Without manual intervention, the water flow can be opened and closed adaptively, thereby minimizing the consumption of useless jet water flow and saving water. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of a hard rock pick with a double retaining spring structure.

[0031] Figure 2 It is a schematic diagram of the overall explosion structure of a hard rock pick with a double retaining spring structure.

[0032] Figure 3 It is a schematic diagram of the overall side cross-sectional structure of a hard rock pick with a double retaining spring structure.

[0033] Figure 4 for Figure 3 Schematic diagram of the local enlarged structure at point A in the middle.

[0034] Figure 5 for Figure 3 Schematic diagram of the local enlarged structure at point B in the middle.

[0035] Figure 6 The figure is a schematic diagram of the protrusion structure of a hard rock pick with a double retaining spring structure.

[0036] Figure 7 The figure is a schematic diagram of the shank structure of a hard rock pick with a double retaining spring structure.

[0037] Figure 8 The figure is a schematic diagram of the cross-sectional structure of a shank of a hard rock pick having a double retaining spring structure.

[0038] 100, pick body; 110, tooth handle; 120, tooth head; 130, alloy cutter head; 210, plug-in slot; 220, bump; 230, locking assembly; 310, first water flow channel; 320, stepped pressurization chamber; 330, nozzle; 340, second water flow channel; 410, mounting slot; 420, clamping column; 430, first spring; 440, locking member; 450, sliding chamber; 460, sliding member; 470, slide groove; 480, baffle; 510, groove; 520, extension column; 530, second spring; 540, pressure plate; 550, water inlet chamber; 560, sealing ring; 570, through hole; 610, matching slot; 620, guide part; 630, positioning part; 710, retaining spring; 810, dustproof sheet. DETAILED DESCRIPTION

[0039] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the embodiments. It should be understood that the embodiments are only for explaining the present invention and are not intended to limit it. Example

[0040] See also Figure 1-2 The present embodiment provides a hard rock pick with a double retaining spring structure, which includes a pick body 100, the pick body 100 includes a detachably connected tooth handle 110 and a tooth head 120, the tooth head 120 and the tooth handle 110 are formed with a protruding block 220 protruding outward at the bottom wall corresponding to the tooth head 120, and a plurality of plug-in parts extending outward are formed at equal intervals on the outer wall of the protruding block 220;

[0041] A docking groove that cooperates with the bottom wall of the tooth head 120 is formed at the top wall of the tooth shank 110, and an inwardly recessed plug-in groove 210 that cooperates with the protrusion 220 and the multiple plug-in parts is formed at the bottom wall of the docking groove. The protrusion 220 is used to cooperate with the multiple plug-in parts to form a circumferential limit on the tooth head 120. Locking components 230 are provided on the side walls corresponding to the tooth head 120 and the multiple plug-in parts. The locking components 230 are used to limit the protrusion 220.

[0042] The present invention discloses a hard rock pick with a double retaining spring structure. By configuring the pick to have a detachably connected shank 110 and a tooth head 120, when the tooth head 120 needs to be replaced due to wear or damage, only the tooth head part needs to be replaced without replacing the entire pick, which not only reduces material waste but also reduces production and maintenance costs.

[0043] It can be understood that the protrusion 220 and multiple plug-in parts at the bottom wall of the tooth head 120 cooperate with the docking groove and the plug-in groove 210 on the top wall of the shank 110 to form a circumferential limit, ensuring the firm connection of the tooth head 120 on the shank 110 and preventing rotation during operation, which would affect the overall structural strength.

[0044] It is understandable that the arrangement of the plug-in portion and the plug-in slot makes the installation and removal process of the tooth head 120 simpler and faster, and in conjunction with the locking assembly 230, no complicated tools or operating steps are required while ensuring the connection strength, thereby greatly improving the installation and removal efficiency.

[0045] See Figure 4 In this embodiment, an inwardly recessed installation groove 410 is formed on the side wall of the plug-in slot 210, and the locking assembly 230 includes a clamping column 420 slidably disposed in the installation groove 410, and a first spring 430 is provided between the clamping column 420 and the side wall of the installation groove 410, and the first spring 430 is used to provide an elastic force to keep the clamping column 420 pressed against the inside of the plug-in slot 210.

[0046] The above structure ensures that after the tooth head 120 is installed in place, the clamping column 420 can automatically and tightly fit on the protrusion 220 and the side wall of the plug-in portion to form a reliable locking effect, thereby enhancing the connection stability between the tooth head 120 and the shank 110.

[0047] See Figure 4 In this embodiment, a sliding cavity 450 with an opening at one end is formed inside the clamping column 420, a locking member 440 with one end passing through the mounting groove 410 and extending into the sliding cavity 450 is provided on the outer wall of the tooth handle 110, a sliding member 460 is rotatably provided at the end of the locking member 440 extending into the sliding cavity 450, a sliding groove 470 cooperating with the sliding member 460 is formed on the inner wall of the sliding cavity 450, the sliding groove 470 is used to limit the sliding member 460 in the circumferential direction, a baffle 480 is slidably provided at the locking member 440, and the baffle 480 is detachably provided at the opening of the sliding cavity 450.

[0048] By setting a sliding cavity 450 inside the clamping column 420, setting a locking piece 440 on the outer wall of the tooth handle 110, and cooperating with the sliding piece 460 and the sliding groove 470, controllable adjustment of the locking state of the clamping column 420 is achieved, so that the operator can conveniently unlock or lock the clamping column 420 by tightening the locking piece 440 inward or twisting it outward, thereby enhancing the controllability and stability of the locking, and further improving the connection strength between the tooth handle 110 and the tooth head 120.

[0049] It is understandable that when the locking piece 440 is twisted outward, the blocking column 420 can be driven outward through the baffle 480, thereby disengaging the blocking column 420 from the matching groove 610 and releasing the limit on the tooth head 120; tightening the locking piece 440 inward can lock the blocking column 420 to prevent the blocking column 420 from rebounding.

[0050] It is understandable that when the locking member 440 does not limit the locking column 420, the locking column 420 can be automatically pre-locked through the cooperation of the spring.

[0051] See Figure 6 In this embodiment, a side wall of the plug-in portion is recessed inward to form a matching groove 610 that matches the clamping column 420 , and a guide portion 620 corresponding to the clamping column 420 is formed at the bottom wall of the matching groove 610 .

[0052] The matching groove 610 is arranged along the height direction of the plug-in portion, and the height of the matching groove 610 is greater than the diameter of the clamping column 420 .

[0053] Through the above structure, a precise matching space is provided for the clamping column 420 , ensuring that the clamping column 420 can be accurately aligned when inserted into the matching groove 610 .

[0054] The guide portion 620 formed at the bottom wall of the mating groove 610 guides the clamping column 420 so that the clamping column 420 can slide smoothly along the guide portion 620 when inserted into the mating groove until it reaches the locking position. Example

[0055] See Figure 3 This embodiment also provides a hard rock pick with a double retaining spring structure, which differs from the first embodiment in that: a groove 510 concave inwardly is formed at the bottom wall of the plug-in slot 210, a second water flow channel 340 arranged along the axial direction of the groove 510 and communicating with the groove 510 is formed at the tooth head 120, an extension column 520 extending into the plug-in slot 210 is formed at the top wall of the second water flow channel 340, a pressure plate 540 is slidably provided at the outer wall of the extension column 520, a second spring 530 is provided between the bottom wall of the pressure plate 540 and the top wall of the groove 510, and the second spring 530 is used to provide an elastic force to keep the pressure plate 540 flush with the bottom wall of the plug-in slot 210;

[0056] The second water flow channel 340 is detachably connected to a high-pressure water jet, and the high-pressure water jet is used to convey water under pressure into the second water flow channel 340 .

[0057] A through cavity is formed inside the extension column 520, which opens downward and is connected to the second water flow channel 340, and a plurality of through holes 570 for water outlet are formed on the side wall of the through cavity;

[0058] An alloy cutter head 130 is provided at the top of the tooth head 120. A first water flow channel 310 cooperating with the extension column 520 is formed inside the tooth head 120. A nozzle 330 penetrating the first water flow channel 310 and arranged in a conical shape is provided on the side of the tooth head 120 near one end of the alloy cutter head 130.

[0059] The conical nozzle 330 is disposed at the lateral position of the front end of the tooth body, which can assist the pick to break rocks to the greatest extent without reducing the strength of the tooth head 120 .

[0060] The convex block 220 is formed with a water inlet cavity 550 which is connected with the first water flow channel 310 and allows the extension column 520 to extend into the water inlet cavity 550 which cooperates with the through hole 570. The first water flow channel 310 and the extension column 520 are formed with an annular groove at the corresponding position. A sealing ring 560 is arranged in the annular groove. A stepped pressurizing cavity 320 for enhancing water pressure is formed at the first water flow channel 310. The axial height of the water inlet cavity 550 along the tooth head 120 is greater than the diameter of the through hole 570.

[0061] Among them, when the pressure and flow of the high-pressure water pump are constant, the jet can increase the pressure through the stepped boosting chamber 320 set in the tooth head 120. The boosted jet can generate high-frequency "water hammer pressure", which can intensify rock crushing and fatigue damage and improve the rock crushing effect.

[0062] A positioning portion 630 is formed at the bottom wall of the protrusion 220 and matches with the groove 510 and extends into the groove 510 .

[0063] By arranging a first water flow channel 310, a nozzle 330 in the tooth head 120 and a second water flow channel 340 in the tooth handle 110, the high-pressure water jet can pressurize water and deliver it to the nozzle 330 for spraying, thereby assisting the pick body 100 in breaking rocks. It can make full use of the water wedge effect of the rock to expand cracks, and cooperate with the conical nozzle 330 to be opened at the lateral position of the front end of the tooth body. Without reducing the strength of the tooth head 120, the target distance is reduced. The rock breaking target distance is small, which greatly reduces the force on the pick and improves the life of the pick and the rock breaking efficiency.

[0064] In addition, by configuring the second spring 530, the water inlet chamber 550, the extension column 520 and the pressure plate 540, when the pick body 100 is breaking rock, the tooth head 120 will continuously squeeze the shank 110 inward, thereby connecting the through hole 570 with the water inlet chamber 550, so that the water in the second water flow channel 340 enters the water inlet chamber 550 through the through hole 570 and is continuously transported to the nozzle 330 for spraying; when the pick body 100 is not breaking rock, due to the configuration of the second spring 530, the tooth head 120 is separated from the shank 110, so that the through hole 570 is not connected with the water inlet chamber 550, and the water in the second water flow channel 340 is cut off, and finally when breaking rock, there is water flow at the nozzle 330 to assist, and when breaking rock is not performed, there is no water flow, and no manual intervention is required, and the water flow can be opened and closed adaptively, thereby minimizing the consumption of useless jet water flow and saving water.

[0065] In this embodiment, an annular groove is formed on the side wall of the docking groove, and a dustproof sheet 810 is provided in the annular groove. The dustproof sheet 810 is used to cooperate with the outer wall of the tooth head 120; the tooth shank 110 has a connecting part connected to the tooth seat, and two fixing grooves are formed on the outer wall of the connecting part, and a retaining spring 710 is provided in each of the fixing grooves.

[0066] By providing a dustproof sheet 810 in the annular groove formed on the side wall of the docking groove, dust, gravel and other debris are effectively prevented from entering the docking groove, thereby enhancing the sealing and dustproof performance of the docking groove and preventing dust, gravel and other debris from entering and affecting the sliding between the tooth shank 110 and the tooth head 120.

[0067] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application to obtain other embodiments based on one or several embodiments provided in the present application, and these embodiments do not exceed the protection scope of the present application.

[0068] The present invention and its implementation methods are described schematically above, and the description is not restrictive. The embodiments shown in the embodiments are only part of the implementation methods of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by the embodiments and designs a structure and an implementation method similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the protection scope of the present invention.

Claims

1. A hard rock pick with a double retaining spring structure, characterized in that: The pick tooth body (100) comprises a detachably connected tooth handle (110) and a tooth head (120), the tooth head (120) and the tooth handle (110) having bottom walls corresponding to the tooth head (120) and the tooth handle (110) formed with outwardly protruding bumps (220), and a plurality of outwardly extending plug-in portions formed at equal intervals on the outer wall of the bump (220); A docking groove cooperating with the bottom wall of the tooth head (120) is formed at the top wall of the tooth handle (110), and an inwardly recessed plugging groove (210) cooperating with the protrusion (220) and the plurality of plugging parts is formed at the bottom wall of the docking groove. The protrusion (220) is used to cooperate with the plurality of plugging parts to limit the circumference of the tooth head (120). The side walls corresponding to the tooth head (120) and the plurality of plugging parts are provided with locking components (230), and the locking components (230) are used to limit the protrusion (220); A groove (510) recessed inwardly is formed at the bottom wall of the plug-in slot (210), a second water flow channel (340) arranged along the axial direction of the groove (510) and communicating with the groove (510) is formed at the tooth head (120), an extension column (520) extending into the plug-in slot (210) is formed at the top wall of the second water flow channel (340), a pressure plate (540) is slidably provided at the outer wall of the extension column (520), a second spring (530) is provided between the bottom wall of the pressure plate (540) and the top wall of the groove (510), and the second spring (530) is used to provide an elastic force to keep the pressure plate (540) flush with the bottom wall of the plug-in slot (210); A through cavity is formed inside the extension column (520), the through cavity opening downward and communicating with the second water flow channel (340), and a plurality of through holes (570) for water outlet are formed on the side wall of the through cavity.

2. The hard rock pick with a double retaining spring structure according to claim 1, characterized in that: An inwardly recessed mounting groove (410) is formed on a side wall of the plug-in groove (210); the locking assembly (230) comprises a clamping column (420) slidably disposed in the mounting groove (410); a first spring (430) is disposed between the clamping column (420) and the side wall of the mounting groove (410); the first spring (430) is used to provide an elastic force to keep the clamping column (420) pressed against the inside of the plug-in groove (210).

3. The hard rock pick with a double retaining spring structure according to claim 2, characterized in that: A sliding cavity (450) with an opening at one end is formed inside the clamping column (420), a locking member (440) having one end penetrating the mounting groove (410) and extending into the sliding cavity (450) is provided at the outer wall of the tooth handle (110), a sliding member (460) is rotatably provided at the end of the locking member (440) extending into the sliding cavity (450), a sliding groove (470) cooperating with the sliding member (460) is formed on the inner wall of the sliding cavity (450), the sliding groove (470) is used to limit the sliding member (460) in the circumferential direction, and a baffle (480) is slidably provided at the locking member (440), and the baffle (480) is detachably provided at the opening of the sliding cavity (450).

4. The hard rock pick with a double retaining spring structure according to claim 1, characterized in that: A matching groove (610) matching with the clamping column (420) is formed inwardly at the side wall of the plug-in portion, and a guide portion (620) corresponding to the clamping column (420) is formed at the bottom wall of the matching groove (610).

5. The hard rock pick with a double retaining spring structure according to claim 1, characterized in that: An alloy cutter head (130) is provided at the top of the tooth head (120), a first water flow channel (310) cooperating with the extension column (520) is formed inside the tooth head (120), and a nozzle (330) penetrating the first water flow channel (310) and arranged in a conical shape is provided on the side surface of one end of the tooth head (120) close to the alloy cutter head (130).

6. The hard rock pick with a double retaining spring structure according to claim 5, characterized in that: The convex block (220) is formed with a water inlet cavity (550) which is connected with the first water flow channel (310) and allows the extension column (520) to extend into the water inlet cavity (550) which cooperates with the through hole (570). An annular groove is formed at the corresponding position of the first water flow channel (310) and the extension column (520), and a sealing ring (560) is provided in the annular groove. A stepped pressure-boosting cavity (320) for enhancing water pressure is formed at the first water flow channel (310), wherein the axial height of the water inlet cavity (550) along the tooth head (120) is greater than the diameter of the through hole (570).

7. The hard rock pick with a double retaining spring structure according to claim 6, characterized in that: A positioning portion (630) is formed on the bottom wall of the protrusion (220) and matches the groove (510) and extends into the groove (510).

8. The hard rock pick with a double retaining spring structure according to claim 1, characterized in that: An annular groove is formed at the side wall of the docking groove, a dustproof sheet (810) is arranged in the annular groove, and the dustproof sheet (810) is used to cooperate with the outer wall of the tooth head (120); the tooth shank (110) has a connecting portion connected to the tooth seat, and two fixing grooves are formed at the outer wall of the connecting portion, and a retaining spring (710) is arranged in each of the fixing grooves.

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