Down-the-hole drill bit clamping and positioning device

Abstract

The utility model belongs to the field of workpiece positioning devices capable of being detached from a machine tool, and particularly relates to a down-the-hole drill bit clamping and positioning device. The down-the-hole drill bit clamping and positioning device comprises a fixing base, a clamping groove used for being arranged outside a clamping jaw of a chuck in a clamped mode is formed in the fixing base, a jacking screw used for jacking the side face of the clamping jaw so as to fix the fixing base to the clamping jaw is assembled on at least one side groove wall of the two opposite side groove walls of the clamping groove in a threaded mode, and a mandrel is assembled on the fixing base in a guiding and moving mode. One end of the core shaft is provided with an operation structure for being lifted by hands, and the other end of the core shaft is provided with a positioning head which is used for extending into a slag discharging groove of the down-the-hole drill bit to position the slag discharging groove. The fixing base is fixed to the clamping jaws of the chuck by tightening the jacking screws to clamp the clamping jaws, installation is easy, threaded blind holes do not need to be formed in the chuck body, any machining does not need to be conducted on the clamping jaws, mass distribution of the chuck cannot be affected, and then the rotating balance of the chuck cannot be affected.

Description

Technical Field

[0001] The utility model relates to a down-the-hole drill bit clamping and positioning device, belonging to the field of workpiece positioning devices that can be removed from a machine tool. Background Art

[0002] The down-the-hole drill bit is one of the main tools for hard rock drilling. The end of the down-the-hole drill bit is fixed with carbide (hereinafter referred to as alloy teeth). The alloy teeth are inserted into the tooth holes at the end of the down-the-hole drill bit in an interference fit manner. When drilling, the alloy teeth are like the blade of a knife, acting on the rock to break the rock. The tooth holes are usually distributed along the circumference and different circle diameters. The distribution angle of the tooth holes has high requirements. Therefore, the position of the tooth holes on the down-the-hole drill bit needs to be accurately positioned in the circumference to meet the use requirements.

[0003] Among the existing down-the-hole drill bit clamping and positioning devices, there is a repeated positioning device for a machining center disclosed in a Chinese utility model patent with authorization announcement number CN211361464U and authorization announcement date 2020.08.28. The device (down-the-hole drill bit clamping and positioning device) includes a base, a three-jaw chuck is fixed on the top of the base, and a bracket is fixed to the top of the three-jaw chuck (i.e., the top of the chuck body) by two bolts. Two corresponding threaded blind holes are arranged on the top of the chuck body, and the bolts respectively penetrate the bracket and are threadedly connected to the corresponding threaded blind holes. A through groove is arranged on the left side of the bracket, and a positioning sleeve is slidably connected to the right side of the bracket. A positioning rod (i.e., a core shaft) slidably connected to the through groove is penetrated on the left side of the through groove, and a positioning head for circumferential positioning of the down-the-hole drill bit is fixedly connected to the left side of the positioning rod. The right side of the positioning rod sequentially penetrates the bracket and the positioning sleeve and extends to the outside of the positioning sleeve. A handle (i.e., a handle) is threadedly connected to the right end of the positioning rod, and a pulling ring is fixedly connected to the right end of the handle. The part of the positioning rod located in the positioning sleeve is provided with a spring, and the left side of the spring is fixed to the outer surface of the positioning rod, and the right side of the spring is fixed to the inner surface of the positioning sleeve. When in use, the down-the-hole drill is placed between the three jaws, and the hand pull ring is pulled to the right to move the positioning rod away from the workpiece. At this time, the spring is compressed, and the hand pull ring is released. Under the action of the spring, the positioning rod can drive the positioning head to move, so that the positioning head is inserted into the slag discharge groove of the down-the-hole drill to position it, and then the workpiece is fixed by the three-jaw chuck.

[0004] However, before installing the above-mentioned down-the-hole drill bit clamping and positioning device, two threaded blind holes need to be set on the chuck body and the position accuracy of the threaded blind holes needs to be ensured, which makes the installation and use process of the positioning device very complicated. At the same time, the depth of the threaded blind holes needs to ensure the stability of the positioning device when in use, so the two threaded blind holes should have a certain depth, resulting in a lack of material at the part of the chuck body where the threaded blind holes are set, resulting in uneven mass distribution of the entire chuck, which in turn affects the balance of the chuck rotation and leads to poor processing accuracy of the workpiece. Utility Model Content

[0005] The purpose of the utility model is to provide a down-the-hole drill bit clamping and positioning device to solve the problem that when the existing down-the-hole drill bit clamping and positioning device is fixed to the top of the chuck body by bolts, a threaded blind hole needs to be set on the top of the chuck body, which leads to cumbersome installation and use procedures of the device and unbalanced rotation of the chuck.

[0006] In order to achieve the above-mentioned purpose, the down-the-hole drill bit clamping and positioning device in the utility model adopts the following technical solutions:

[0007] A down-the-hole drill bit clamping and positioning device comprises a fixed seat, the fixed seat is provided with a clamping groove for clamping the outside of the clamping claw of the chuck, at least one side of the groove wall on the opposite sides of the groove is threadedly equipped with a tightening screw for tightening the side of the clamping claw to fix the fixed seat on the clamping claw, a core shaft is installed on the fixed seat for guiding and moving, one end of the core shaft is provided with an operating structure for people to lift and pull, and the other end is provided with a positioning head for extending into the slag discharge groove of the down-the-hole drill bit to position the slag discharge groove.

[0008] The beneficial effect of the above technical solution is that the utility model is a pioneering invention. The down-the-hole drill bit clamping and positioning device includes a fixed seat, and a clamping groove for clamping the outside of the claw of the chuck is provided on the fixed seat. A tightening screw for tightening the side of the claw is provided on at least one side of the groove wall on the opposite sides of the groove, so as to fix the fixed seat on the claw. There is no need to set a threaded blind hole on the chuck body, and the tightening screw tightens the side of the claw, so there is no need to perform any processing on the claw, so as not to affect the mass distribution of the chuck, and further not to affect the rotational balance of the chuck, thereby ensuring the processing accuracy of the workpiece. In addition, the fixed seat can be fixed on the claw by simply screwing the tightening screw, and the installation is simple and convenient.

[0009] Furthermore, at least two tightening screws threadedly assembled on the same side groove wall of the clamping groove are provided, and the tightening screws are arranged at intervals along the guiding movement direction of the core shaft.

[0010] Furthermore, the fixing seat includes two side plates arranged in parallel and spaced apart and a connecting block connected between the two side plates, the two side plates and the connecting block together form the slot, at least one side plate is threadedly equipped with the tightening screw, and the core shaft is guided and moved and assembled on the connecting block.

[0011] Furthermore, the positioning head comprises a spherical portion, and the surface of the spherical portion is used to fit with the wall of the slag discharge trough.

[0012] Furthermore, the positioning head also includes a cylindrical portion connected to the spherical portion, and the cylindrical portion is fixedly connected to the end of the core shaft.

[0013] Furthermore, the end of the core shaft is provided with an external thread, the positioning head is provided with an internal thread, and the positioning head is fixedly connected to the external thread of the end of the core shaft through the internal thread.

[0014] Furthermore, an elastic member is provided between the core shaft and the fixed seat, which is used to deform when the core shaft is pulled so that the positioning head can be elastically pressed into the slag discharge groove.

[0015] Furthermore, a mounting hole extending along the guiding movement direction of the core shaft is provided on the fixed seat, and the mounting hole is a stepped hole, including a large diameter hole and a small diameter hole, and a step surface is formed between the large diameter hole and the small diameter hole. The core shaft passes through the large diameter hole and the small diameter hole, and an annular boss is provided on the core shaft, which is located in the large diameter hole and is used to cooperate with the step surface for blocking. A limiting piece is installed at the hole mouth position of the large diameter hole, and the elastic piece is arranged in the large diameter hole, and one end of the elastic piece abuts against the limiting piece, and the other end abuts against the annular boss.

[0016] Furthermore, the limiting member is a linear bearing, and the core shaft passes through the linear bearing and is in guiding and sliding cooperation with the linear bearing.

[0017] Furthermore, a handle is fixed to one end of the core shaft away from the positioning head, and the handle constitutes an operating structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of an embodiment of a down-the-hole drill bit clamping and positioning device of the utility model;

[0019] Figure 2 It is a cross-sectional view of an embodiment of the down-the-hole drill bit clamping and positioning device of the utility model;

[0020] Figure 3 It is a structural schematic diagram of an embodiment of the down-the-hole drill bit clamping and positioning device of the utility model when it is installed on a three-jaw chuck.

[0021] In the figure: 1. fixing seat; 1.1. front side plate; 1.2. rear side plate; 1.3. connecting block; 2. tightening screw; 3. U-shaped slot; 4. core shaft; 4.1. annular boss; 5. positioning head; 5.1. cylindrical part; 5.2. spherical part; 6. spring; 7. linear bearing; 8. handle; 9. chuck body; 10. claw; 11. down-the-hole drill bit; 11.1. slag discharge groove; 11.2. tooth hole; 12. mounting hole; 12.1. large diameter hole; 12.2 small diameter hole; 12.3. step surface; 13. hexagon socket screw. DETAILED DESCRIPTION

[0022] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0023] In view of the technical problems existing in the prior art, the basic technical concept of the utility model is as follows: the down-the-hole drill bit clamping and positioning device includes a fixing seat, the fixing seat is provided with a slot for clamping the outside of the claw of the chuck, and at least one side of the groove wall on the opposite sides of the groove is provided with a tightening screw for tightening the side of the claw, so as to fix the fixing seat on the claw, without the need to set a threaded blind hole on the chuck body, and the tightening screw tightens the side of the claw, so there is no need to perform any processing on the claw, so as not to affect the mass distribution of the chuck, and further not affect the rotation balance of the chuck, thereby ensuring the processing accuracy of the workpiece. In addition, the fixing seat can be fixed on the claw by simply screwing the tightening screw, which is simple and convenient to install.

[0024] Embodiment of the down-the-hole drill bit clamping and positioning device in the utility model:

[0025] like Figure 1 and Figure 3 As shown, the down-the-hole drill bit clamping and positioning device includes a fixing seat 1. Taking a three-jaw chuck as an example, the three-jaw chuck includes a chuck body 9 and three jaws 10. The fixing seat 1 is provided with a slot for clamping on the outside of the jaws 10, and at least one side of the groove walls on the opposite sides of the slot is threadedly equipped with a tightening screw for tightening the side of the jaws 10 to fix the fixing seat 1 on the jaws 10. In this embodiment, the slot is a U-shaped slot 3. At least one side of the groove walls on the opposite sides of the U-shaped slot 3 is threadedly equipped with a tightening screw 2 for tightening the side of the jaws 10 to fix the fixing seat 1 on the jaws 10, and at least two tightening screws are threadedly equipped on the same side of the U-shaped slot. In this embodiment, only one side of the groove walls on the opposite sides of the U-shaped slot 3 is threadedly equipped with a tightening screw 2, and two tightening screws are provided. During installation, the groove walls on the opposite sides of the U-shaped groove 3 are respectively located on the corresponding sides of the claw 10, and the side without the tightening screw is tightly attached to the corresponding side of the claw 10, and the tightening screw 2 is tightened. At this time, the groove wall with the tightening screw 2 and the corresponding side of the claw 10 are matched with a clearance, and the clearance is very small to ensure the installation accuracy of the fixing seat 1 and the positioning accuracy of the down-the-hole drill bit. In addition, there is no need to set a threaded blind hole on the chuck body 9, and there is no need to perform any processing on the claw, so that the mass distribution of the chuck will not be affected, and the rotation balance of the chuck will not be affected.

[0026] In this embodiment, if Figure 1 and Figure 3As shown, the fixing seat 1 includes two parallel and spaced side panels and a connecting block 1.3 connected between the two side panels. The position of the connecting block 1.3 is the right side of the fixing seat 1. The two side panels are respectively the front side panel 1.1 and the rear side panel 1.2. The front side panel 1.1, the rear side panel 1.2 and the connecting block 1.3 together form a U-shaped slot 3. The tightening screws 2 on the slot wall of the U-shaped slot 3 are installed on the rear side panel 1.2. Therefore, when installing and using, the front side panel 1.1 and the rear side panel 1.2 are respectively located on both sides of the claw 10, and the tightening screws 2 are tightened. At this time, the front side surface of the claw 10 is close to the front side panel 1.1, and the rear side surface of the claw 10 is tightened by the two tightening screws 2, so that the fixing seat 1 is clamped on the claw 10.

[0027] like Figure 1-3 As shown, the fixed seat 1 is provided with a mandrel 4 for guiding movement, and the mandrel 4 is guided and installed on the connecting block 1.3. The guiding movement direction of the mandrel 4 is perpendicular to the groove depth and groove width direction of the U-shaped slot 3, so as to ensure that the mandrel 4 can move closer to or farther away from the down-the-hole drill bit 11 when guided, and the two tightening screws 2 are arranged at intervals along the guiding movement direction of the mandrel 4, so as to ensure that the fixed seat 1 can swing back and forth when in use.

[0028] like Figure 2 As shown, the connecting block 1.3 is provided with a mounting hole 12 extending along the guiding moving direction of the mandrel 4, and the mounting hole 12 is a stepped hole, including a large diameter hole 12.1 and a small diameter hole 12.2. A step surface 12.3 is formed between the large diameter hole 12.1 and the small diameter hole 12.2, and the mandrel 4 passes through the large diameter hole 12.1 and the small diameter hole 12.2, and the mandrel 4 is provided with an annular boss 4.1 located in the large diameter hole 12.1 and used to stop and cooperate with the step surface 12.3, and the step surface 12.3 can provide support for the annular boss 4.1 and limit the maximum distance that the mandrel 4 moves in the direction close to the down-the-hole drill bit 11.

[0029] like Figure 1-3 As shown, one end of the mandrel 4 is provided with an operating structure for a person to pull by hand, so that the user can perform a pulling operation, and the mandrel can be guided and moved by the operating structure during use. In this embodiment, the operating structure is set as a handle 8, and the mandrel 4 can be moved by pulling the handle 8. The other end of the mandrel 4 is provided with a positioning head 5 for extending into the slag discharge groove 11.1 of the down-the-hole drill bit 11 to position the slag discharge groove 11.1. In this embodiment, as shown in FIG. Figure 1 As shown, the mandrel 4 and the positioning head 5 are fixedly connected by threads. Specifically, an external thread is provided at the end of the mandrel 4, and an internal thread is provided on the positioning head 5. The positioning head 5 is fixedly connected to the external thread at the end of the mandrel 4 through the internal thread. During production, a plurality of positioning heads 5 matching the slag discharge grooves 11.1 of different down-the-hole drill bits 11 can be manufactured. The threaded connection facilitates the replacement of the positioning head 5 to meet the positioning requirements of different down-the-hole drill bits 11.

[0030] like Figure 1-3 As shown, the positioning head 5 includes a spherical portion 5.2, the surface of which is used to fit with the wall of the slag discharge groove 11.1 to accurately position the down-the-hole drill bit 11. When in use, even if the mandrel 4 is deflected relative to the claw 10, the surface of the spherical portion 5.2 can always fit with the wall of the slag discharge groove 11.1, so that the down-the-hole drill bit 11 can be accurately positioned. The positioning head 5 also includes a cylindrical portion 5.1 connected to the spherical portion 5.2, and the cylindrical portion 5.1 is provided with the above-mentioned internal thread to be fixedly connected to the end of the mandrel 4.

[0031] like Figure 2 As shown, an elastic member is provided between the mandrel 4 and the connecting block 1.3, which is used to deform under force when the mandrel 4 is pulled so that the positioning head 5 can be elastically pressed against the slag discharge groove 11.1. When in use, the elastic member can apply pressure to the down-the-hole drill bit 11, so that in the process of adjusting the position of the down-the-hole drill bit 11, the spherical portion 5.2 of the positioning head 5 can be kept in contact with the groove wall of the slag discharge groove 11.1, thereby improving the positioning accuracy. In this embodiment, the elastic member is set as a spring 6, and the spring 6 is sleeved on the mandrel 4 and located in the large diameter hole 12.1. A limit member is installed at the orifice position of the large diameter hole 12.1. In this embodiment, the limit member is set as a linear bearing 7, specifically a square flange linear bearing, and the square flange portion of the end of the linear bearing 7 is fixed to the top of the connecting block 1.3 by a plurality of hexagon socket screws 13, and four hexagon socket screws 13 are provided, which are respectively located at the four corners of the square flange portion of the linear bearing 7.

[0032] The mandrel 4 passes through the linear bearing 7 and is guided and slidably matched with the linear bearing 7. The linear bearing 7 can ensure that the mandrel 4 is aligned with the linear bearing 7 when moving. One end of the spring 6 abuts against the linear bearing 7, and the other end abuts against the annular boss 4.1. The spring 6 is in a pre-compressed state. When the handle 8 is pulled upward, the spring 6 is further compressed. When the handle 8 is released, the spring 8 is reset and drives the positioning head 5 to approach the down-the-hole drill bit 11, so that the spherical portion 5.2 of the positioning head 5 fits with the slag discharge groove 11.1. Therefore, the workpiece coordinate system reference of the lateral slag discharge groove 11.1 and the circumferential tooth hole of the down-the-hole drill bit 11 can be connected with the circumferential reference of the machine tool coordinate system through the spherical portion 5.2 of the positioning head 5. Then, the relative angle deviation between each tooth hole 11.2 and the workpiece coordinate system is established through programming. The relative angle of each tooth hole 11.2 relative to the selected circumferential reference is input into the program, so that the circumferential positioning of the position of each tooth hole 11.2 can be realized, and then the tooth hole 11.2 can be drilled.

[0033] When in use: taking the three-jaw chuck as an example, make the two opposite groove walls of the U-shaped groove 3 be located on the corresponding sides of the claw 10 respectively. At this time, the front side plate 1.1 and the rear side plate 1.2 are respectively located on the front and rear sides of the claw 10. Tighten the tightening screws 2 in sequence. At this time, the front side surface of the claw 10 is close to the front side plate 1.1, and the rear side surface is tightened by the tightening screws 2, so that the fixing seat 1 is fixed on the claw 10. Put the down-the-hole drill bit 11 between the clamping claws 10, pull the handle 8 upwards, rotate the down-the-hole drill bit 11, make the slag discharge groove 11.1 and the spherical part 5.2 of the positioning head 5 basically align visually, loosen the handle 8, and then observe the positional relationship between the spherical part 5.2 and the slag discharge groove 11.1. If the spherical part 5.2 does not fit the groove wall of the slag discharge groove 11.1, rotate the down-the-hole drill bit 11 until the spherical part 5.2 fits the groove wall of the slag discharge groove 11.1 to accurately position the down-the-hole drill bit 11. At this time, use the clamping claws 10 to clamp the down-the-hole drill bit 9, remove the positioning device, and complete the positioning operation.

[0034] In other embodiments, the handle may not be provided at the end of the mandrel away from the positioning head, and the operation can be performed directly through the end of the mandrel.

[0035] In other embodiments, the limit member may not be configured as a linear bearing, and a baffle may be provided on the top of the mounting hole, and the baffle is fixed on the top surface of the connecting block. In this case, the baffle is the limit member, so that the end of the spring is fixed to the baffle, and the annular boss of the core shaft is guided and matched with the large diameter hole, and the lower part of the core shaft is guided and matched with the small diameter hole, so as to ensure the movement accuracy of the core shaft.

[0036] In other embodiments, when the elastic member is set, the elastic member can be set as a tension spring. In this case, a fixing ring can be set on the connecting block, and a fixing ring can also be set on the handle. The two ends of the tension spring are respectively fixed to the handle fixing ring and the connecting block fixing ring. The tension spring is in a pre-stretched state. When the handle is pulled upward, the tension spring is further stretched. When the handle is released, the tension spring drives the handle to move downward. At this time, the core shaft can be set as a round rod, and the mounting hole is a through hole with consistent upper and lower apertures and matched with the core shaft guide; in other embodiments, the core shaft can be set as a T-shaped rod, and in this case a T-shaped groove matching with the core shaft guide is set on the connecting block; in other embodiments, the core shaft can also be set as a dovetail-shaped straight rod, and a dovetail groove matching with the core shaft guide is set on the connecting block.

[0037] In other embodiments, the elastic member may not be provided, and the mandrel may move up and down. In this case, the mandrel may move downward by its own gravity and drive the spherical portion of the positioning head to fit into the slag discharge groove of the down-the-hole drill bit.

[0038] In other embodiments, when setting the connection method between the positioning head and the core shaft, the positioning head and the core shaft can be fixedly connected by an interference fit, and no threads are set on the positioning head and the core shaft; in other embodiments, the positioning head can also be directly welded to the core shaft.

[0039] In other embodiments, the positioning head may not be provided with a cylindrical portion, and the positioning head may be provided in a spherical shape. In this case, a blind hole may be provided on the top of the spherical positioning head, and the blind hole is a threaded hole, so that the positioning head is fixedly connected to the core shaft through the blind hole; in other embodiments, the spherical positioning head may also be welded to the core shaft.

[0040] In other embodiments, when setting the positioning head structure, the positioning head can be set to be cylindrical, and the cylindrical shape is consistent with the shape of the slag discharge groove, so that the positioning head can be completely fitted with the slag discharge groove during use to accurately position the down-the-hole drill bit.

[0041] In other embodiments, when setting the fixing seat structure, the fixing seat may include front, rear, left, right, and upper side panels, in which case the bottom of the fixing seat is open, the slot is a rectangular slot, and the front side panel and / or the rear side panel are threadedly assembled with a tightening screw; in other embodiments, the fixing seat may include front, rear, left, and right side panels, in which case the fixing seat is open at the top and bottom, the slot is a rectangular slot, and the front side panel and / or the rear side panel are threadedly assembled with a tightening screw.

[0042] In other embodiments, when setting the number of the tightening screws, the tightening screws may be three, four, or five, etc.; in other embodiments, the tightening screw may also be one.

[0043] In other embodiments, when setting the arrangement of the tightening screws, the tightening screws can be arranged at intervals in a direction perpendicular to the guide movement direction of the core shaft; in other embodiments, they can also be arranged at intervals in a direction with an angle less than 90 degrees or greater than 90 degrees to the guide movement direction of the core shaft.

[0044] Finally, it should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments without creative work, or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A down-the-hole drill bit clamping and positioning device, characterized in that: The invention comprises a fixing seat, on which is provided a clamping groove for clamping the outside of the clamping claw of the chuck, on which at least one of the groove walls on the two opposite sides of the clamping groove is threadedly equipped with a clamping screw for clamping the side surface of the clamping claw to fix the fixing seat on the clamping claw, and on which is provided a core shaft for guiding and moving, one end of the core shaft is provided with an operating structure for manual lifting, and the other end is provided with a positioning head for extending into the slag discharge groove of the down-the-hole drill bit to position the slag discharge groove.

2. The down-the-hole drill bit clamping and positioning device according to claim 1, characterized in that: At least two tightening screws threadedly assembled on the same side groove wall of the clamping groove are arranged, and the tightening screws are arranged at intervals along the guiding moving direction of the core shaft.

3. The down-the-hole drill bit clamping and positioning device according to claim 1 or 2, characterized in that: The fixing seat includes two parallel and spaced side plates and a connecting block connected between the two side plates. The two side plates and the connecting block together form the slot. At least one side plate is threadedly equipped with the tightening screw. The core shaft is guided and moved and assembled on the connecting block.

4. The down-the-hole drill bit clamping and positioning device according to claim 1 or 2, characterized in that: The positioning head comprises a spherical portion, the surface of which is used to fit with the wall of the slag discharge trough.

5. The down-the-hole drill bit clamping and positioning device according to claim 4, characterized in that: The positioning head also includes a cylindrical portion connected to the spherical portion, and the cylindrical portion is fixedly connected to the end of the core shaft.

6. The down-the-hole drill bit clamping and positioning device according to claim 1 or 2, characterized in that: The end of the core shaft is provided with an external thread, the positioning head is provided with an internal thread, and the positioning head is fixedly connected with the external thread of the end of the core shaft through the internal thread.

7. The down-the-hole drill bit clamping and positioning device according to claim 1 or 2, characterized in that: An elastic member is arranged between the core shaft and the fixing seat, which is used to be deformed by force when the core shaft is pulled so that the positioning head can be elastically pressed into the slag discharge groove.

8. The down-the-hole drill bit clamping and positioning device according to claim 7, characterized in that: The fixed seat is provided with a mounting hole extending along the guiding movement direction of the core shaft. The mounting hole is a stepped hole, including a large diameter hole and a small diameter hole. A step surface is formed between the large diameter hole and the small diameter hole. The core shaft passes through the large diameter hole and the small diameter hole, and the core shaft is provided with an annular boss located in the large diameter hole and used to cooperate with the step surface for blocking. A limiting piece is installed at the hole mouth position of the large diameter hole. The elastic piece is arranged in the large diameter hole, and one end of the elastic piece abuts against the limiting piece, and the other end abuts against the annular boss.

9. The down-the-hole drill bit clamping and positioning device according to claim 8, characterized in that: The limiting member is a linear bearing, and the core shaft passes through the linear bearing and is in guiding and sliding cooperation with the linear bearing.

10. The down-the-hole drill bit clamping and positioning device according to claim 1 or 2, characterized in that: A handle is fixed on one end of the core shaft away from the positioning head, and the handle constitutes an operating structure.

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