Drill bit clamping device

Abstract

The invention discloses a drill bit clamping device, and relates to the technical field of parts of machine tools. A drill bit clamping device comprises a drill bit and a chuck used for clamping the drill bit, and the chuck comprises a center shaft hole used for allowing the drill bit to penetrate through. An annular rotation groove communicated with the middle shaft hole is further formed in the chuck. The rotary groove and the middle shaft hole are coaxially arranged; at least one rotary groove is arranged; when a plurality of rotary grooves are arranged, the plurality of rotary grooves are coaxially arranged up and down; the drill bit is hollow and internally provided with a clamping and fixing assembly. The clamping and fixing assembly comprises a shifting piece, a locking block and an unlocking piece. Locking blocks in one-to-one correspondence with the heights of the rotary grooves are arranged on the shifting piece, and the locking blocks at the same height are uniformly distributed around the axis of the drill bit; a locking block hole matched with the locking block in position is formed in the side wall of the drill bit; one end of the locking block extends out of the locking block hole and is assembled with the rotary groove; the unlocking piece controls the position of the locking block so that the locking block can be located in the drill bit or stretch out of the drill bit. According to the technical scheme, on the basis of a single-chuck structure, limitation on the degree of freedom of the drill bit is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of machine tool parts, and in particular to a drill bit clamping device. Background Art

[0002] In the current mechanical processing of key dimensions of parts and components, there are great requirements for the absolute stability of the machine tool, which places great demands on the stability of the tool. In a sense, the stability of the tool determines the processing accuracy of the parts. The drill bit is a kind of tool used for processing holes. In the prior art, the drill bit is installed on a chuck, and the chuck is connected to the drive shaft of the machine tool, so that the machine tool action is transmitted to the drill bit. In order to ensure the processing accuracy of the drill bit, it is necessary to limit the degree of freedom of the drill bit. In order to limit the degree of freedom of the drill bit, a multi-chuck (chuck refers to the claw used to clamp the drill bit) structure is generally adopted. For example, the Chinese patent document CN201510747470.9 discloses a crankcase cover drilling device, which uses four chucks to limit the degree of freedom of the drill bit. As for the single chuck structure, there is no way to limit the degree of freedom of the drill bit in the prior art. Summary of the invention

[0003] The purpose of the present invention is to provide a drill bit clamping device which, based on a single chuck structure, limits the freedom of the drill bit and solves the problems in the prior art.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A drill bit clamping device comprises a drill bit and a chuck for clamping the drill bit, the chuck comprising a central axis hole for inserting the drill bit; an annular revolving groove connected to the central axis hole is also provided in the chuck; the revolving groove is coaxially arranged with the central axis hole; at least one revolving groove is provided; when a plurality of revolving grooves are provided, the plurality of revolving grooves are coaxially arranged up and down; The drill bit is hollow inside and is provided with a clamping assembly; the clamping assembly includes a paddle, a locking block, and an unlocking member; the paddle is provided with a locking block corresponding to the height of the rotary groove, and the locking blocks at the same height are evenly distributed around the axis of the drill bit; A locking block hole matching the position of the locking block is provided on the side wall of the drill bit; one end of the locking block extends out of the locking block hole and is assembled with the rotary groove; The unlocking member controls the position of the locking block so that the locking block is located inside the drill bit or extends out of the drill bit.

[0005] As a preferred technical solution, the lower part of the chuck is a clamping claw. The structure is that the lower part of the chuck is provided with a plurality of expansion grooves that penetrate the bottom and the central axis hole, and the plurality of expansion grooves are evenly distributed around the axis of the central axis hole.

[0006] As a preferred technical solution, the unlocking part is an unlocking button, which is connected to the paddle by a paralyzed connection. An opening matching the position of the unlocking button is opened on the drill bit, so that one end of the unlocking button extends out of the drill bit. When the chuck and the drill bit are assembled, the unlocking button is located under the chuck.

[0007] As a preferred technical solution, multiple locking blocks are located on the same paddle.

[0008] As a preferred technical solution, a sliding hole is provided on the pick, a locking block is provided in the sliding hole, the locking block and the sliding hole are slidably matched, one end of the locking block passes through the locking block hole of the drill bit and is assembled with the rotary groove, and the other end of the locking block passes through the sliding hole and is provided with a rack and pinion assembly; The unlocking member drives the movement of the driven gear in the rack and pinion assembly, and the driven rack in the rack and pinion assembly is connected to the locking block.

[0009] As a preferred technical solution, the unlocking part includes an unlocking rod and an active rack. The unlocking rod is vertically movably arranged in the drill bit; the active rack is arranged on the unlocking rod, and each driven gear is coaxially provided with a driving gear. The active rack engages or disengages with the driving gear during movement.

[0010] As a preferred technical solution, it also includes a limit assembly, and each driving gear corresponds to a set of limit assemblies; The limit assembly includes a limit gear, a connecting plate, and a mounting seat. The mounting seat is fixed on the paddle. A rotating shaft is rotatably provided on the mounting seat. The rotating shaft is connected to one end of a torsion spring, and the other end of the torsion spring is connected to the mounting seat. The rotating shaft is fixedly connected to one end of the connecting plate, and a limit gear is provided at the other end of the connecting plate. The limit gear meshes with the driving gear, and the driven gear is limited by limiting the rotation of the driving gear. The limit assembly also includes a toggle block and a contact rod, the toggle block is arranged on the unlocking rod, and the toggle block is located above the active rack; the contact rod is arranged on the connecting plate, and the contact rod is located on the moving path of the toggle block; when the toggle block contacts the contact rod and lifts the contact rod, the active rack contacts the active gear; when the toggle block is separated from the contact rod, the active rack is separated from the active gear.

[0011] As a preferred technical solution, a drill hole matching the unlocking rod is opened on the top of the drill bit, so that the unlocking rod can be taken out from the top of the drill bit; The position where the active rack of the unlocking rod is meshed with the active gear is the first state; after the unlocking rod is moved, the active rack is staggered with the active gear, and the position where the toggle block is staggered with the contact rod is the second state; The drill bit opening matches the shape of the unlocking rod when it is in the second state, and the unlocking rod is separated from the drill bit in the second state.

[0012] As a preferred technical solution, a connecting head is provided on the top of the unlocking rod. The width of the connecting head is greater than the width of the drill hole. A countersunk hole is provided on the edge of the drill hole for placing the connecting head. When the connecting head is placed in the countersunk hole, the height of the active rack is lower than the height of the lowest active gear.

[0013] As a preferred technical solution, the driven racks on the locking blocks at the same height on the two paddles are mirror-symmetrical, and a driven gear is provided between the two driven racks on the locking blocks at the same height on the two paddles.

[0014] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, by providing an expansion groove on the chuck, the expansion groove has the ability to deform, so that the jaws can clamp the drill bit, and when a large external force is applied, the drill bit can also be separated from the jaws. By providing a revolving groove, the size of the revolving groove matches the size of the locking block. When the locking block is located in the revolving groove, the upper and lower side walls of the revolving groove can limit the displacement of the locking block by abutting against the limiting locking block, thereby limiting the freedom of the drill bit, and realizing the freedom limitation based on a single chuck.

[0015] In the present invention, a paddle is provided, and the locking block is connected to the spring through the paddle, rather than the locking block being directly connected to the spring, so that the rigidity of the paddle itself can enhance the connection effect. When subjected to external force, the paddle can resist deformation, while if the external force acts directly on the spring through the locking block, the spring will deform directly and the freedom restriction cannot be achieved. And when there are multiple locking blocks on the same paddle, different locking blocks are connected to the same paddle, which further restricts the paddle, thereby further enhancing the connection effect.

[0016] In the present invention, by setting a sliding adjustable locking block and a matching rack and pinion assembly and an unlocking rod, the number of locking blocks extending out of the drill bit can be controlled through a purely mechanical structure, thereby adjusting the installation height of the drill bit relative to the chuck to match different drilling depths. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of Example 1.

[0018] Figure 2 This is a cross-sectional view of Example 1.

[0019] Figure 3 This is a schematic diagram of the structure of the drill bit in Example 1.

[0020] Figure 4 This is a schematic diagram of the structure of the fixing assembly in Example 1.

[0021] Figure 5 This is a schematic diagram of the structure of the drill bit in Example 2.

[0022] Figure 6 Schematic diagram of the structure of the fixing assembly in Example 2.

[0023] Figure 7 This is a schematic diagram of the structure of the drill bit in Example 2.

[0024] Among them, the figure numbers are as follows: 1-chuck, 101-expansion groove, 102-rotating groove, 2-drill bit, 3-fixing assembly, 301-locking head, 302-spring, 303-paddle, 304-unlocking button, 305-driven rack, 306-driven gear, 307-driving gear, 308-limiting gear, 309-unlocking rod, 310-driving rack, 311-paddle block, 312-connecting rod, 313-mounting seat, 314-contact rod, 315-connecting head. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] On the contrary, the present application covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present application as defined by the claims. Further, in order to make the public have a better understanding of the present application, some specific details are described in detail in the detailed description of the present application below. Those skilled in the art can fully understand the present application without the description of these details.

[0027] Example 1 like Figure 1-4 As shown, a drill bit 2 clamping device includes a chuck 1 and a drill bit 2 matched with the chuck 1. The chuck 1 includes a central axis hole for passing the drill bit 2. The chuck 1 is designed with a variable diameter so that the bottom diameter of the chuck 1 is smaller than the top diameter of the chuck 1. The lower part of the chuck 1 is a clamping jaw, and the structure is that the lower part of the chuck 1 is provided with a plurality of bulging grooves 101 that penetrate the bottom and the central axis hole, and the plurality of bulging grooves 101 are evenly distributed around the axis of the central axis hole. By setting the bulging grooves 101 at the clamping jaw, the clamping jaw can not only install and remove the drill bit 2, but also the deformation of the bulging grooves 101 can clamp the drill bit 2.

[0028] Furthermore, an annular revolving groove 102 communicating with the central axis hole is provided in the chuck 1; the revolving groove 102 is coaxially arranged with the central axis hole. There is at least one revolving groove 102, and when there are multiple revolving grooves 102, the multiple revolving grooves 102 are coaxially arranged up and down.

[0029] Furthermore, the drill bit 2 is hollow inside, and a clamping component 3 for further limiting the degree of freedom of the drill bit 2 is provided inside the drill bit 2 .

[0030] The clamping assembly 3 includes a paddle 303, a locking block, an unlocking button 304, and a telescopic member. The paddle 303 is provided with a locking block corresponding to the height of the rotary groove. In this embodiment, at least two paddles 303 are provided, and the locking blocks at the same height on at least two paddles 303 are evenly distributed around the axis of the drill bit 2.

[0031] The paddle 303 is provided with an unlocking button 304 and a telescopic member, and the paddle 303 is connected to other paddles 303 or the inner wall of the drill bit 2 through the telescopic member. In this embodiment, the telescopic member is a spring 302.

[0032] A locking block hole matching the position of the locking block is provided on the side wall of the drill bit 2 , and an unlocking hole matching the position of the unlocking button 304 is provided on the side wall of the drill bit 2 .

[0033] One end of the lock block extends out of the lock block hole and is assembled with the rotating groove 102; one end of the unlocking button 304 extends out of the unlocking hole for easy operation. Applying force to the unlocking button 304 causes the spring 302 to deform, and at this time, one end of the lock block does not extend beyond the lock block hole. When the spring 302 returns to its original position, one end of the lock block extends out of the lock block hole.

[0034] In this embodiment, during assembly, the unlocking button 304 is pressed so that the locking block is located not beyond the drill bit 2. The chuck 1 holding the drill bit 2 moves up and down along the axis. When it moves to the specified position, the unlocking button 304 is released, and the drill bit 2 with the locking block is clamped in the corresponding rotating groove to achieve freedom restriction. The chuck 1 is transferred to the machine tool. When the chuck 1 and the drill bit 2 are assembled together, the unlocking button 304 is located outside the chuck 1. Therefore, when the drill bit 2 is worn and needs to be removed, the unlocking button 304 is pressed to unlock it, and then the drill bit 2 can be taken out.

[0035] In this embodiment, by providing an expansion groove in the chuck 1, the expansion groove has the ability to deform, so that the jaws can clamp the drill bit 2, and when a large external force is applied, the drill bit 2 can also be separated from the jaws. By providing a revolving groove, the size of the revolving groove matches the size of the locking block. When the locking block is located in the revolving groove, the upper and lower side walls of the revolving groove can limit the displacement of the locking block by abutting against the locking block, thereby limiting the degree of freedom of the drill bit 2, and realizing the degree of freedom limitation based on the single chuck 1.

[0036] In this embodiment, a paddle 303 is provided, and the locking block is connected to the spring 302 through the paddle 303, rather than the locking block being directly connected to the spring 302, so that the rigidity of the paddle 303 itself can enhance the connection effect, and when subjected to external force, the paddle 303 can resist deformation, while if the external force acts directly on the spring 302 through the locking block, the spring 302 will be directly deformed, and the degree of freedom cannot be restricted. And when there are multiple locking blocks on the same paddle 303, different locking blocks are connected to the same paddle 303, which further restricts the paddle 303, thereby further enhancing the connection effect.

[0037] Furthermore, in this embodiment, the number of the revolving grooves is preferably four.

[0038] Example 2 like Figure 5-Figure 7 As shown, the difference between this embodiment and embodiment 1 lies in the difference in the fastening assembly 3. In this embodiment, the fastening assembly 3 includes a paddle 303, a locking block, a telescopic member, and an unlocking rod 309. The telescopic member is a gear rack assembly.

[0039] In this embodiment, the structural designs of the locking block, the paddle 303, the telescopic member, and the unlocking lever 309 are all different.

[0040] Through the setting of the clamping assembly 3, the number of locking blocks that can extend out of the outer wall of the drill bit 2 can be adjusted. For example, if the number of revolving grooves is N, and the number of locking blocks on any paddle 303 is N, the present embodiment can adjust the number of locking blocks on any paddle 303 extending out of the outer wall of the drill bit 2 to 0-N through the structure of the gear rack assembly and the unlocking rod 309. When the number of locking blocks extending out of the outer wall of the drill bit 2 is less than N, the height of the drill bit 2 relative to the chuck 1 can be adjusted, so as to adjust the length of the drill bit 2 located at the outer area of ​​the bottom of the chuck 1 according to different hole depth requirements. At the same time, the degree of freedom can be limited by the revolving groove on the basis of a single chuck 1. Specifically, in this embodiment, there are two paddles 303 .

[0041] In this embodiment, each paddle 303 is provided with a locking block corresponding to the height of the rotary groove. A sliding hole is provided on the paddle 303, and a locking block is provided in the sliding hole. The locking block and the sliding hole are slidably matched, and the gap between the two is extremely small. One end of the locking block passes through the locking block hole of the drill bit 2 and is assembled with the rotary groove. The other end of the locking block passes through the sliding hole and is provided with a horizontally arranged driven rack 305. The driven racks 305 on the locking blocks at the same height on the two paddles 303 are mirror-symmetrical. A driven gear 306 is provided between the two driven racks 305 on the locking blocks at the same height on the two paddles 303. The driven gear 306 is coaxially connected to the driving gear 307, and the rotation of the driving gear 307 drives the rotation of the driven gear 306.

[0042] The driving gear 307 , the driven gear 306 , and the driven rack 305 constitute the above-mentioned gear and rack assembly.

[0043] When the gear rotates forward or reverse, the gear rack meshing with it reciprocates in a straight line, thereby driving the two locking blocks to move toward or away from each other, thereby driving the two locking blocks to simultaneously extend the drill bit 2 or retract the drill bit 2. It is worth noting that when designing the dimensions, it should be ensured that when the locking block is at the extreme position of extension, part of the locking block is still located in the sliding hole; when the locking block is retracted to not exceed the outer wall of the drill bit 2, part of the locking block is still located in the locking block hole, so as to ensure the supporting effect of the sliding hole and the locking block hole on the locking block.

[0044] The unlocking lever 309 includes a vertical rod, and a vertical active rack 310 is provided on a part of the upper area of ​​the vertical rod. The active rack 310 meshes with the active gear 307 during movement, but the active rack 310 cannot mesh with two active gears 307 at the same time during the up and down movement.

[0045] By controlling the up and down movement of the unlocking rod 309 , the active rack 310 can be meshed with the active gears 307 at different heights in sequence, thereby controlling the extension and retraction of the locking blocks at different heights in sequence.

[0046] Specifically, if the N locking blocks on the same paddle 303 are all initially extended from the outer wall of the drill bit 2, the active rack 310 will control the retraction of the bottom-top locking blocks in sequence during the process of moving from the bottom to the top. This working method will make the assembly state of the chuck 1 and the drill bit 2 in the initial state to be the state with the shortest drilling depth of the drill bit 2. The subsequent adjustment of the extension amount of the locking blocks will make the drilling depth of the drill bit 2 deeper and deeper.

[0047] Specifically, since the driving gear 307 needs to be kept in a locked state, in this embodiment, the fastening assembly 3 further includes a limiting assembly for limiting the rotation of the driving gear 307 .

[0048] Each driving gear 307 corresponds to a set of limiting components. The limiting components include a limiting gear 308, a connecting plate, and a mounting seat 313. The mounting seat 313 is fixed on the paddle 303. A rotating shaft is rotatably provided on the mounting seat 313. The rotating shaft is connected to one end of a torsion spring, and the other end of the torsion spring is connected to the mounting seat 313. The rotating shaft is fixedly connected to one end of the connecting plate, and a limiting gear 308 is provided at the other end of the connecting plate. The limiting gear 308 is meshed with the driving gear 307, and the driven gear 306 is limited by limiting the rotation of the driving gear 307, thereby limiting the displacement of the driven gear 306, thereby limiting the displacement of the locking block.

[0049] When external force is applied to rotate the shaft, the limit gear 308 is separated from the driving gear 307. At this time, the driving gear 307 is unlocked, and the driving gear 307 rotates under the activation of the driving rack 310. When the external force stops, the limit gear 308 returns to its original position under the action of the torsion spring, thereby locking the driving gear 307 again.

[0050] In this embodiment, the key components for locking and unlocking the active gear 307 are a toggle block 311 and a contact rod 314. The toggle block 311 is arranged on the unlocking rod 309, and the toggle block 311 is located above the active rack 310. The contact rod 314 is arranged on the connecting plate, and the contact rod 314 is located on the moving path of the toggle block 311.

[0051] When designing the dimensions, it is necessary to ensure that when the toggle block 311 contacts the contact rod 314 and lifts the contact rod 314 (at this time, the connecting plate drives the rotating shaft to rotate, and the limit gear 308 is separated from the driving gear 307), the driving rack 310 contacts the driving gear 307. When the toggle block 311 is separated from the contact rod 314 (at this time, the limit gear 308 returns to its original position under the action of the torsion spring and meshes with the driving gear 307), the driving rack 310 is separated from the driving gear 307.

[0052] As the unlocking rod 309 moves upward, the toggle block 311 sequentially contacts and lifts up the contact rods 314 at different heights. At this time, the active rack 310 meshes with the corresponding active gear 307, driving the active gear 307 to rotate. The rotation of the active gear 307 causes the driven rack 305 to move, driving the two identical gears to rotate. The locking blocks at different heights move toward each other and retract into the drill bit 2. When the locking block retracts to the limit position, the active rack 310 separates from the active gear 307, and the toggle block 311 separates from the contact rod 314, so that at this limit position, the limit gear 308 engages with the active gear 307 to fix the position of the locking block. In the process of the unlocking rod 309 gradually moving upward, the above process is repeated, so that the locking blocks are retracted into the drill bit 2 one by one from bottom to top. Therefore, by adjusting the height of the unlocking rod 309, the amount of the locking block extending out of the drill bit 2 can be controlled.

[0053] When the unlocking rod 309 moves from top to bottom, the toggle block 311 pushes the contact rod 314 upward, and the active rack meshes with the active gear 307, so that the two locking blocks of the same height move in opposite directions, and the locking blocks extend out of the drill bit 2. When the locking block extends to the limit position, the active rack 310 separates from the active gear 307, the toggle block 311 and the contact rod 314 also separate, and the limit gear 308 meshes with the active gear 307 to lock the position. In the process of the unlocking rod 309 gradually moving downward, the above process is repeated, so that the locking blocks extend out of the drill bit 2 one by one from bottom to top. Therefore, by adjusting the height of the unlocking rod 309, the amount of the locking block extending out of the drill bit 2 can be controlled.

[0054] Furthermore, an opening matching the unlocking rod 309 is provided at the top of the drill bit 2 , so that the unlocking rod 309 can be removed from the top of the drill bit 2 as a whole.

[0055] For ease of description, the first state is defined as the position where the active rack 310 of the unlocking lever 309 is meshed with the active gear 307. After the unlocking lever 309 is moved, the active rack 310 is staggered with the active gear 307, and the position where the toggle block 311 is staggered with the contact rod 314 is defined as the second state.

[0056] Specifically, the opening is a square long hole. When the contact rod 314 abuts against one end of the opening, it is in the first state, and when the contact rod 314 abuts against the other end of the opening, it is in the second state.

[0057] The opening on the drill bit 2 matches the shape of the unlocking rod 309 when it is in the second state, and the unlocking rod 309 is separated from the drill bit 2 in the second state (at this time, the toggle block 311 can pass through the opening). The reason for this design is that when the unlocking rod 309 is in the first state, the unlocking work of meshing with the active gear 307 is completed. Assuming that there are N lock blocks, when it is adjusted from bottom to top to the N-1th lock block, the adjustment is stopped. If the unlocking rod 309 is taken out while maintaining the first state, the active rack 310 on the unlocking rod 309 will inevitably mesh with the active gear 307 at the last high position, causing the last lock block to retract. Therefore, the second state is designed. When the required lock block is retracted, the unlocking rod 309 moves and is adjusted to the second state. At this time, the unlocking rod 309 continues to move upward, the active rack 310 is staggered with the active gear 307, and the toggle block 311 is also staggered with the contact rod 314. At this time, the active gear 307 is no longer meshed and driven during the upward movement.

[0058] Furthermore, a connecting head 315 is provided on the top of the unlocking rod 309, and the width of the connecting head 315 is greater than the width of the hole of the drill bit 2. A countersunk hole is provided on the edge of the hole of the drill bit 2 for placing the connecting head 315. When the connecting head 315 is placed in the countersunk hole, the height of the active rack 310 is lower than the height of the lowest active gear 307.

[0059] The unlocking rod 309 has a square cross-section. The unlocking rod 309 is located in the square long hole of the guide cylinder and cannot rotate but can only move in a straight line.

[0060] The unlocking lever 309 is provided with scales to indicate the corresponding relationship between the driving rack 310 and the driving gears 307 at different heights.

[0061] It is worth noting that, based on the above structural design, in order to solve the same technical problem, even if some insubstantial improvements are made on the present invention, they also fall within the protection scope of the present invention.

Claims

1. A drill bit clamping device, comprising a drill bit and a chuck for clamping the drill bit, characterized in that: The chuck includes a central axis hole for inserting a drill bit; an annular revolving groove connected to the central axis hole is also provided in the chuck; the revolving groove is coaxially arranged with the central axis hole; at least one revolving groove is provided; when a plurality of revolving grooves are provided, the plurality of revolving grooves are coaxially arranged up and down; The drill bit is hollow inside and is provided with a clamping assembly; the clamping assembly includes a paddle, a locking block, and an unlocking member; the paddle is provided with a locking block corresponding to the height of the rotary groove, and the locking blocks at the same height are evenly distributed around the axis of the drill bit; A locking block hole matching the position of the locking block is provided on the side wall of the drill bit; one end of the locking block extends out of the locking block hole and is assembled with the rotary groove; The unlocking member controls the position of the locking block so that the locking block is located inside the drill bit or extends out of the drill bit.

2. A drill bit clamping device according to claim 1, characterized in that: The lower part of the chuck is a clamping claw. The structure is that the lower part of the chuck is provided with a plurality of expansion grooves penetrating the bottom and the central axis hole, and the plurality of expansion grooves are evenly distributed around the axis of the central axis hole.

3. A drill bit clamping device according to claim 1, characterized in that: The unlocking part is an unlocking button, which is connected to the paddle by a paralyzed connection. An opening matching the position of the unlocking button is opened on the drill bit, so that one end of the unlocking button extends out of the drill bit. When the chuck and the drill bit are assembled, the unlocking button is located under the chuck.

4. A drill bit clamping device according to claim 1, characterized in that: Multiple locks are located on the same paddle.

5. A drill bit clamping device according to claim 1, characterized in that: A sliding hole is provided on the pick, and a locking block is provided in the sliding hole. The locking block and the sliding hole are slidably matched. One end of the locking block passes through the locking block hole of the drill bit and is assembled with the rotary groove. The other end of the locking block passes through the sliding hole and is provided with a rack and pinion assembly. The unlocking member drives the movement of the driven gear in the rack and pinion assembly, and the driven rack in the rack and pinion assembly is connected to the locking block.

6. A drill bit clamping device according to claim 5, characterized in that: The unlocking member includes an unlocking rod and an active rack. The unlocking rod is vertically movably arranged in the drill bit; the active rack is arranged on the unlocking rod, and each driven gear is coaxially provided with an active gear. The active rack engages or disengages with the active gear during movement.

7. A drill bit clamping device according to claim 6, characterized in that: It also includes a limit assembly, and each driving gear corresponds to a set of limit assemblies; The limit assembly includes a limit gear, a connecting plate, and a mounting seat. The mounting seat is fixed on the paddle. A rotating shaft is rotatably provided on the mounting seat. The rotating shaft is connected to one end of a torsion spring, and the other end of the torsion spring is connected to the mounting seat. The rotating shaft is fixedly connected to one end of the connecting plate, and a limit gear is provided at the other end of the connecting plate. The limit gear meshes with the driving gear, and the driven gear is limited by limiting the rotation of the driving gear. The limit assembly also includes a toggle block and a contact rod, the toggle block is arranged on the unlocking rod, and the toggle block is located above the active rack; the contact rod is arranged on the connecting plate, and the contact rod is located on the moving path of the toggle block; when the toggle block contacts the contact rod and lifts the contact rod, the active rack contacts the active gear; when the toggle block is separated from the contact rod, the active rack is separated from the active gear.

8. A drill bit clamping device according to claim 7, characterized in that: A drill hole matching the unlocking rod is provided on the top of the drill bit, so that the unlocking rod can be taken out from the top of the drill bit; The position where the active rack of the unlocking rod is meshed with the active gear is the first state; after the unlocking rod is moved, the active rack is staggered with the active gear, and the position where the toggle block is staggered with the contact rod is the second state; The drill bit opening matches the shape of the unlocking rod when it is in the second state, and the unlocking rod is separated from the drill bit in the second state.

9. A drill bit clamping device according to claim 8, characterized in that: A connector is provided on the top of the unlocking rod, the width of which is greater than the width of the drill hole, and a countersunk hole is provided on the edge of the drill hole for placing the connector. When the connector is placed in the countersunk hole, the height of the active rack is lower than the height of the lowest active gear.

10. A drill bit clamping device according to claim 5, characterized in that: The driven racks on the locking blocks on the two paddles at the same height are mirror-symmetrical, and a driven gear is arranged between the two driven racks on the locking blocks on the two paddles at the same height.

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