Tool head quick clamping structure and electric tool

Abstract

The application relates to the field of electric tool structures, and particularly discloses a tool head quick clamping structure and an electric tool, wherein the tool head quick clamping structure comprises a tool holder main body, a tool head which is detachably mounted on the tool holder main body, and a bushing which is slidably sleeved outside the tool holder main body; the tool holder main body is provided with a locking piece arranging position, the locking piece arranging position is provided with a locking piece, the tool holder main body is provided with a mounting hole, one end of the tool head is an insertion end, the peripheral surface of the insertion end is provided with an annular locking groove, and the insertion end of the tool head is inserted into the mounting hole of the tool holder main body during installation; the inner wall of the bushing is provided with a protruding part, the protruding part is located outside the locking piece; an avoiding space is formed between the inner wall of the bushing and the outer wall of the tool holder main body, and the avoiding space is located in the outer side area of the locking piece; a first elastic assembly is mounted between the tool holder main body and the bushing, one end of the first elastic assembly is in contact with the locking piece, and installation can be completed by only inserting with one hand, so that the work efficiency is remarkably improved.

Description

Technical Field

[0001] This application relates to the field of power tool structures, and in particular to a tool head quick-clamp structure and a power tool. Background Technology

[0002] When installing power tool bits (drill bits or screwdriver bits), they are mainly installed on the tool holder by insertion and then locked. Based on our understanding of the relevant technologies, there are currently two main structures for installing tool bits. The first structure requires manually moving the outer bushing when inserting the drill bit or screwdriver bit, and then using a sleeve mounted on the tool holder to prevent the steel ball engaged with the locking groove of the tool bit from moving radially outward. This operation requires two actions and both hands, which will affect normal work efficiency.

[0003] The second structure allows the tool head to be directly inserted into the tool holder and locked in place. Although the tool head can be installed with one hand, the frequent vibration of the steel ball in this structure will cause wear on the tool head shaft, affecting the service life of the overall structure. Utility Model Content

[0004] The purpose of at least one specific embodiment of this utility model is to overcome the defects of the prior art and provide a tool head quick clamp structure and a power tool.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A tool head quick-clamp structure, comprising:

[0007] Tool rack body;

[0008] The tool head is detachably mounted on the tool holder body;

[0009] The bushing is slidably fitted onto the outside of the tool holder body;

[0010] The tool rack body has a locking device placement position, and a locking device is provided at the locking device placement position. The tool rack body has a mounting hole, and one end of the tool head is suitable for insertion into the mounting hole.

[0011] The inner wall of the bushing has a protrusion, which is located on the outside of the locking element;

[0012] An clearance space is formed between the inner wall of the bushing and the outer wall of the tool holder body, and the clearance space is located in the outer area of ​​the locking element;

[0013] A first elastic component is installed between the tool holder body and the bushing, and one end of the first elastic component is in contact with the locking element;

[0014] When one end of the tool head is inserted into the mounting hole, it pushes the locking member to move within the locking member placement position and squeezes the first elastic component. When the locking member moves to the clearance space, the locking member moves outward toward the peripheral surface of the tool head and clears the insertion path of the tool head.

[0015] When the locking groove on the peripheral surface of the tool head corresponds to the position of the locking member, the first elastic component resets and pushes the locking member into the locking groove. The protrusion is located on the outside of the locking member and radially limits it. The locking member locks the path of the tool head being pulled out.

[0016] Furthermore, the first elastic component includes a first elastic member, a gasket that abuts against the first elastic member, the gasket being supported on one side of the locking member, and the end of the first elastic member away from the gasket being supported on a boss of the tool holder body.

[0017] Furthermore, a first support plate is installed at the boss, and the end of the first elastic element away from the gasket abuts against the first support plate.

[0018] Furthermore, the gasket includes a main body and an extension. The main body is fitted onto the outside of the tool holder body, and the extension extends into the locking member mounting position and is supported on one side of the locking member.

[0019] Furthermore, a second elastic component is installed between the tool holder body and the bushing, with the first elastic component supported on one side of the protrusion and the second elastic component supported on the other side of the protrusion.

[0020] The first elastic component is adapted to reset the locking member and provide elastic support for the locking member;

[0021] The second elastic component is adapted to reset the bushing after it has slid.

[0022] Furthermore, the second elastic component includes a second elastic member and a second support plate mounted on the tool holder body. One end of the second elastic member abuts against the protrusion, and the other end abuts against the second support plate.

[0023] Furthermore, the locking element is positioned as a through hole, and at least a portion of the surface of the locking element can be exposed through the upper and lower openings of the through hole.

[0024] Furthermore, the locking element is in the form of a sphere or a pin.

[0025] Furthermore, the end of the tool head that is inserted into the mounting hole is configured as an insertion end, and the insertion end is provided with a first inclined surface. When the insertion end is inserted into the mounting hole, it pushes the locking member to move within the locking member placement position and squeezes the first elastic component. When the locking member moves to the clearance space, the locking member moves along the first inclined surface toward the outer side of the tool head's circumference and avoids the insertion path of the tool head.

[0026] Furthermore, a second inclined surface is provided on one side of the protrusion. When the locking groove on the peripheral surface of the tool head corresponds to the position of the locking member, the first elastic component resets and pushes the locking member to fall into the locking groove along the second inclined surface. The protrusion is located on the outside of the locking member and radially limits it. The locking member locks the path of the tool head being pulled out.

[0027] Furthermore, when unlocking the tool head extraction path, under the action of external force, the bushing slides on the outside of the tool holder body and squeezes the second elastic component until the clearance space is located outside the locking member. When the tool head is extracted, the inner wall of the locking groove can squeeze the locking member, causing the locking member to move towards the outer circumference of the tool head and avoid the extraction path of the tool head. When the external force on the bushing disappears, the second elastic component drives the bushing to reset.

[0028] Furthermore, the locking groove can be an annular groove or other form of recess, and the wall surface of the locking groove can be an arc-shaped surface or a grooved surface, etc.

[0029] Furthermore, the through hole extends along the length of the tool holder body, and the extended area corresponds to the protrusion and the clearance space;

[0030] The through hole forms an upper opening on the outer surface of the tool holder body and a lower opening on the inner wall of the tool holder body;

[0031] The upper surface of the locking element is exposed through the upper opening and faces the inner wall of the clearance space or the protrusion.

[0032] The lower surface of the locking element is exposed through the lower opening and faces the circumferential surface of the tool head or the locking groove.

[0033] Furthermore, the upper opening has a wider diameter than the lower opening.

[0034] The advantages of the tool head quick-clamp structure provided in this application over the prior art are as follows: 1. The quick-clamp structure achieves self-locking by automatically pushing the locking component when the tool head is inserted, in conjunction with the reset of the first elastic component. Installation can be completed by inserting with only one hand, which significantly improves work efficiency and meets the needs of quick head changing for power tools.

[0035] 2. When the locking element of this structure locks the path of the tool head being pulled out, the protrusion is located on the outside of the locking element and radially limits it, preventing the locking element from disengaging from the locking groove due to vibration or impact of the tool head, thus ensuring locking reliability. Moreover, the first elastic component elastically supports one side of the locking element, so that when the power tool is working, the locking element will not repeatedly rub against the tool head shaft due to high-frequency vibration, thereby reducing wear and extending the tool head life.

[0036] Another technical solution adopted in this application is to provide an electric tool, including the above-mentioned tool head quick-clamp structure.

[0037] Furthermore, the tool head is a drill bit or a screwdriver bit.

[0038] The power tool provided in this application, due to being equipped with the aforementioned tool head quick-clamp structure, has the technical effects of the aforementioned tool head quick-clamp structure. Attached Figure Description

[0039] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the structure of this application.

[0041] Figure 2 This is an assembly diagram of this application.

[0042] Figure 3 This is a cross-sectional schematic diagram of the entire structure when the tool head of this application is just inserted into the main body of the tool holder.

[0043] Figure 4 This is a cross-sectional schematic diagram of one of the assembly processes after the tool head is inserted into the tool holder body.

[0044] Figure 5 This is a cross-sectional schematic diagram of the second assembly process after the tool head is inserted into the main body of the tool holder.

[0045] Figure 6 This is a cross-sectional schematic diagram of the tool head after it has been inserted into the tool holder body and assembled.

[0046] Figure 7 This is a schematic diagram showing the fit between the tool rack body and the locking mechanism of this application.

[0047] Figure 8 This is a cross-sectional schematic diagram of the tool rack body and locking components after they are assembled.

[0048] Figure 9 This is a schematic diagram of the mating structure between the gasket and the main body of the tool holder in this application.

[0049] Figure 10 This is a schematic diagram of the tool head being disassembled according to this application.

[0050] Figure 11 This is a front view of the power tool of this application. Detailed Implementation

[0051] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0052] Example 1

[0053] Reference Figure 1 , Figure 2 , Figure 3 , Figure 7 A tool head quick-clamp structure 100 includes a tool holder body 10, a tool head 20 detachably mounted on the tool holder body 10, and a bushing 30 slidably sleeved on the outside of the tool holder body 10. The tool holder body 10 is provided with a locking element placement position 101, and a locking element 40 is provided at the locking element placement position 101. The tool holder body 10 has a mounting hole 102. One end of the tool head 20 is an insertion end 201, and its peripheral surface has a locking groove 202. In actual installation, the locking groove 202 can be an annular groove or other forms of recess, etc. The wall surface of the locking groove 202 can be an arc-shaped surface or a groove surface, etc. In this embodiment, the locking groove 202 is designed as an annular groove, and the inner wall surface of the locking groove 202 is an arc-shaped surface. When the tool head 20 is installed, its insertion end 201 is inserted into the mounting hole 102 of the tool holder body 10.

[0054] Furthermore, a protrusion 301 is provided on the inner wall of the bushing 30, and the protrusion 301 is located on the outer side of the locking member 40; an clearance space 50 is formed between the inner wall of the bushing 30 and the outer wall of the tool holder body 10, and the clearance space 50 is located in the outer area of ​​the locking member 40.

[0055] A first elastic component 60 is installed between the tool holder body 10 and the bushing 30, and one end of the first elastic component 60 is in contact with the locking member 40.

[0056] Specifically, the first elastic component 60 includes a first elastic member 601, a gasket 602 that abuts against the first elastic member 601, the gasket 602 being supported on one side of the locking member 40, and the end of the first elastic member 601 away from the gasket 602 being supported on the boss 103 of the tool holder body 10.

[0057] Furthermore, a first support plate 603 is installed at the boss 103, and the end of the first elastic member 601 away from the gasket 602 abuts against the first support plate 603.

[0058] Reference Figure 9The gasket 602 includes a main body 602a and an extension 602b. The main body 602a is sleeved on the outside of the tool holder body 10, and the extension 602b extends into the locking member placement position 101 and is supported on one side of the locking member 40.

[0059] Furthermore, a second elastic component 70 is installed between the tool holder body 10 and the bushing 30. The first elastic component 60 is supported on one side of the protrusion 301, and the second elastic component 70 is supported on the other side of the protrusion 301. The first elastic component 60 is adapted to reset the locking member 40 and provide elastic support for the locking member 40, and the second elastic component 70 is adapted to reset the bushing 30 after it has slid.

[0060] Furthermore, the second elastic component 70 includes a second elastic element 701 and a second support plate 702 mounted on the tool holder body 10. One end of the second elastic element 701 abuts against the protrusion 301, and the other end abuts against the second support plate 702. It should be noted that both the first elastic element 601 and the second elastic element 701 are preferably springs.

[0061] In this embodiment, refer to Figure 8 The locking element placement position 101 is a through hole extending along the length of the tool holder body 10. The extended area corresponds to the protrusion 301 and the clearance space 50. The locking element 40 is spherical or pin-shaped, preferably a steel ball. The through hole forms an upper opening 101a on the outer surface of the tool holder body 10 and a lower opening 101b on the inner wall of the tool holder body 10. At least a portion of the surface of the locking element 40 can be exposed through the upper opening 101a and the lower opening 101b of the through hole. In this embodiment, the upper... The diameter of the opening 101a is larger than that of the lower opening 101b. Specifically, the upper surface of the locking member 40 is exposed through the upper opening 101a and faces the inner wall of the clearance space 50 or the protrusion 301, and the lower surface of the locking member 40 is exposed through the lower opening 101b and faces the peripheral surface of the tool head 20 or the locking groove 202. It should be noted that, in this embodiment, for ease of description, the surface of the locking member 40 facing the clearance space 50 is set as the upper surface, and the surface of the locking member 40 facing the tool head 20 is set as the lower surface.

[0062] In this embodiment, the tool rack body 10 has two locking positions 101, and the corresponding number of locking pieces 40 is also two.

[0063] Furthermore, the end of the tool head 20 that is inserted into the mounting hole 102 is configured as an insertion end 201, and the insertion end 201 is provided with a first inclined surface 203, and a second inclined surface 302 is provided on one side of the protrusion 301.

[0064] The following section provides a detailed explanation of this application, using the specific installation process of the tool head 20 as an example:

[0065] Reference Figure 3 , Figure 4 , Figure 5 , Figure 6 When the tool head 20 is not installed, the first elastic component 60 applies a compressive force to the locking member 40 on one side. The locking member 40 is located at one end of the locking member placement position 101 (this end is designated as the first end 101c). The insertion end 201 of the tool head 20 is inserted into the mounting hole 102. The insertion end 201 first pushes the locking member 40 to move towards the second end 101d within the locking member placement position 101. The moving locking member 40 compresses the first elastic component 60. When the locking member 40 moves to the clearance space 50, the locking member 40 moves along the first inclined surface 203 towards the tool head 20. The locking member 40 moves radially outward from its outer periphery. A portion of the top surface of the radially moving locking member 40 protrudes from the upper opening 101a of the locking member mounting position 101. Simultaneously, the bottom surface of the locking member 40 retracts from the lower opening 101b into the locking member mounting position 101. At this time, the locking member 40 avoids the insertion path S1 of the tool head 20. At the same time, the first elastic component 60 resets and drives the locking member 40 to move towards the first end 101c within the locking member mounting position 101. (Under the elastic force of the first elastic component 601, the extension 602b of the gasket 602 pushes the locking member 40...) (0 moves toward the first end 101c). At this time, the locking member 40 fits against one side of the protrusion 301. After the tool head 20 is installed in the mounting hole 102, maintaining the insertion path S1, the locking groove 202 on the tool head 20 is located inside the locking member placement position 101. The locking groove 202, the locking member placement position 101, and the clearance space 50 remain connected. Since the protrusion 301 has a second inclined surface 302 on one side, under the elastic force of the first elastic member 601, the locking member 40 will contact the second inclined surface 302 on the side of the protrusion 301. As a steel ball, under the action of thrust, the extension 602b of the pad 602 will push the locking member 40 down the second inclined surface 302 into the locking member placement position 101 and move to the first end 101c. At this time, the locking member 40 is located inside the protrusion 301, and the protrusion 301 radially limits the locking member 40. At this time, a part of the lower surface of the locking member 40 will fall into the locking groove 202. At the same time, the extension 602b supports one side of the locking member 40 so that the locking member 40 is close to the wall of the first end 101c of the locking member placement position 101.

[0066] Reference Figure 10When the tool head 20 is pulled out from the mounting hole 102, the inner wall of the locking groove 202 will squeeze the locking member 40, causing the locking member 40 to squeeze the first end 101c of the locking member placement position 101. Since the first end 101c itself does not have the ability to deform, the locking member 40 falling into the locking groove 202 locks the tool head 20's extraction path S2.

[0067] Furthermore, when unlocking the extraction path S2 of the tool head 20, a person can apply a pushing or pulling force to the bushing 30. Under the action of the external force, the bushing 30 slides on the outside of the tool holder body 10 and squeezes the second elastic member 701. During the movement of the bushing 30, its internal protrusion 301 will be offset relative to the locking member 40 until the clearance space 50 is located outside the locking member 40. At this time, the radial limiting state of the protrusion 301 on the locking member 40 is released, and the person pulls the tool head in the extraction path S2 direction. At 20 o'clock, the inner wall of the locking groove 202 will squeeze the locking member 40. After being squeezed, the locking member 40 will move along the second inclined surface 302 and toward the upper opening 101a of the locking member placement position 101. At the same time, the upper surface of the locking member 40 will extend into the clearance space 50 through the upper opening 101a. Meanwhile, the lower surface of the locking member 40 will retract into the locking member placement position 101 and make way for the extraction path of the tool head 20. When the external force on the bushing 30 disappears, the second elastic member 701 will drive the bushing 30 to reset.

[0068] In summary, the installation process for tool head 20 is as follows:

[0069] Initial state (tool head not installed): Under the push of the first elastic component 60 (spring + washer), the locking member 40 (steel ball) is located at the first end 101c of the locking member placement position 101 (near the protrusion 301 of the bushing 30). Under the action of the second elastic component 70 (reset spring), the bushing 30 is in the default position, and its protrusion 301 forms a radial limit on the locking member 40 to prevent the locking member 40 (steel ball) from falling out. At this time, the mounting hole 102 of the tool holder body 10 is in the insertion state.

[0070] Inserting the tool head 20: Align the insertion end 201 of the tool head 20 with the mounting hole 102 and push it in axially (installation path S1). The first inclined surface 203 of the tool head 20 contacts the locking member 40 (steel ball) and applies a radially outward force. The steel ball is squeezed by the tool head 20 and moves along the locking member placement position 101 to the second end 101d (away from the protrusion 301 of the bushing 30). At this time, the first elastic component 60 (spring) is compressed, and the washer 602 moves with the steel ball. When the steel ball moves to the clearance space 500, its upper part is exposed from the upper opening 101a and enters the clearance area of ​​the inner wall of the bushing 30. At the same time, the lower part of the steel ball retracts from the lower opening 101b and no longer blocks the insertion path of the tool head 20. The tool head 20 can continue to be pushed in until it is fully inserted.

[0071] When the tool head 20 is fully inserted, its locking groove 202 aligns with the locking member placement position 101. The first elastic component 60 rebounds, pushing the steel ball along the second inclined surface 302 of the protrusion 301 of the bushing 30 into the locking groove 202. The steel ball is partially embedded in the locking groove 202, while the protrusion 301 of the bushing 30 restricts its radial movement, forming a stable lock. The tool head 20 is firmly locked and cannot be pulled out axially (unless the bushing is unlocked). The steel ball is in the locking groove 202, and the protrusion 301 of the bushing provides radial restraint to prevent accidental dislodgement.

[0072] The process of disassembling the tool head:

[0073] Hold the bushing 30 by hand and slide it along the axis of the tool holder body 10 (usually pulling backward or pushing forward, depending on the specific design). When the bushing 30 moves, the protrusion 301 inside it is displaced accordingly, so that the clearance space 50 is aligned with the steel ball. After the bushing 30 moves, its protrusion 301 no longer covers the steel ball, and the steel ball can move freely into the clearance space. The second elastic component 70 (reset spring) is compressed, ready to reset it after the bushing 30 is released.

[0074] Meanwhile, the inner wall of the locking groove 202 remains in contact with the steel ball. However, since the steel ball can move radially, when the tool head 20 is pulled outward, the arc-shaped surface of the locking groove 202 squeezes the steel ball, causing it to move outward along the second inclined surface 302. The upper part of the steel ball enters the clearance space 500, and the lower part exits from the locking groove 202, no longer obstructing the tool head 20. The tool head 20 can then be smoothly pulled out axially (extraction path S2). After the bushing 30 is released, the second elastic component 70 (reset spring) pushes the bushing 30 back to its original position. The protrusion 301 of the bushing 30 moves back to the locking member placement position 101, restoring the initial locking state, ready for the next installation.

[0075] The quick-clamp structure 100 achieves self-locking through an automatic push-locking mechanism when the tool head 20 is inserted, in conjunction with the reset of the first elastic component 60. Installation can be completed with just one hand, significantly improving work efficiency and meeting the needs of power tools for quick head changing.

[0076] When the locking member 40 of this structure locks the path of the tool head 20 being pulled out, the protrusion 301 is located on the outside of the locking member 40 and radially limits it, preventing the locking member 40 from disengaging from the locking groove 202 due to vibration or impact of the tool head 20, thus ensuring locking reliability. Moreover, the first elastic component 60 elastically supports one side of the locking member 40, so that when the power tool is working, the locking member 40 will not repeatedly rub against the shaft of the tool head 20 due to high-frequency vibration, thereby reducing wear and extending the tool head life.

[0077] Example 2

[0078] Reference Figure 11 This embodiment discloses a power tool 200, which includes a motor, a gearbox 210 connected to the motor, and a tool head quick-clamp structure 100 connected to the power output end of the gearbox 210. The specific structure of the tool head quick-clamp structure 100 is as shown in the previous embodiment. The tool holder body 10 of the tool head quick-clamp structure 100 is connected to the power output end of the gearbox 210. In this embodiment, the tool head 20 mounted on the tool holder body 10 can be a drill bit or a screwdriver bit. This structure is suitable for scenarios requiring frequent tool head changes, combining fast operation and high reliability.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A tool head quick clamping structure, comprising: a tool holder body; a tool head detachably mounted on the tool holder body; a bushing slidingly sleeved on the outside of the tool holder body; a locking member installation position is provided on the tool holder body, and a locking member is arranged at the locking member installation position; the tool holder body is provided with a mounting hole, and one end of the tool head is adapted to be inserted into the mounting hole; a protrusion is arranged on the inner wall of the bushing, and the protrusion is located on the outside of the locking member; an avoiding space is formed between the inner wall of the bushing and the outer wall of the tool holder body, and the avoiding space is located in the area outside the locking member; characterized in that a first elastic assembly is mounted between the tool holder body and the bushing, and one end of the first elastic assembly is in contact with the locking member; when one end of the tool head is inserted into the mounting hole, the locking member is pushed to move in the locking member installation position and press the first elastic assembly, and when the locking member moves to the avoiding space, the locking member moves to the outside of the peripheral surface of the tool head and avoids the insertion path of the tool head; when the locking groove on the peripheral surface of the tool head corresponds to the position of the locking member, the first elastic assembly resets and pushes the locking member to fall into the locking groove, the protrusion located on the outside of the locking member limits the radial position of the locking member, and the locking member locks the extraction path of the tool head; the first elastic assembly comprises a first elastic member and a gasket in contact with the first elastic member, the gasket is supported on one side of the locking member, and one end of the first elastic member away from the gasket is supported on a boss of the tool holder body; a first support plate is mounted at the boss, and one end of the first elastic member away from the gasket is in contact with the first support plate; the gasket comprises a main body portion and an extension portion, the main body portion is sleeved on the outside of the tool holder body, and the extension portion extends into the locking member installation position and is supported on one side of the locking member; a second elastic assembly is further mounted between the tool holder body and the bushing, the first elastic assembly is supported on one side of the protrusion, and the second elastic assembly is supported on the other side of the protrusion; wherein the first elastic assembly is adapted to reset the locking member and elastically support the locking member; the second elastic assembly is adapted to reset the bushing after sliding. the second elastic assembly comprises a second elastic member and a second support plate mounted on the tool holder body, one end of the second elastic member is in contact with the protrusion, and the other end is in contact with the second support plate; the locking member installation position is a through hole, and at least part of the surface of the locking member can be exposed from the upper and lower openings of the through hole; the locking member is a spherical ball or a pin column; one end of the tool head inserted into the mounting hole is configured as an insertion end, and the insertion end is provided with a first inclined surface; one side of the protrusion is provided with a second inclined surface. ​ ​ ​ ​ ​ ​ ​ ​ 2. The tool head quick clamp structure according to claim 1, characterized in that, ​ 3. The tool head quick change structure of claim 2, wherein, ​ 4. The tool head quick change structure according to claim 2 or 3, wherein ​ 5. The tool head quick clamp structure according to claim 1, wherein ​ ​ ​ 6. The tool head quick clamp structure according to claim 5, wherein ​ 7. The tool head quick clamp structure according to claim 1, wherein ​ 8. The tool head quick clamp structure of claim 1, wherein ​ 9. The tool head quick clamp structure according to claim 8, wherein ​ 10. The tool head quick clamp structure according to claim 9, wherein ​ 11. The tool head quick clamp structure according to claim 5, wherein When the tool head is extracted, the bushing slides outside the tool holder body under external force and extrudes the second elastic component until the avoiding space is outside the locking piece, the inner wall of the locking groove can extrude the locking piece so that the locking piece moves outside the peripheral surface of the tool head and avoids the extraction path of the tool head, and the second elastic component resets the bushing when the external force disappears.

12. The tool head quick clamp structure according to claim 1, wherein The locking groove is an annular groove or a pit, and the wall surface of the locking groove is an arc surface or a groove surface.

13. The tool head quick clamp structure of claim 7, wherein The through hole extends towards the length direction of the tool holder body, and the extension area corresponds to the protruding part and the avoiding space; The through hole forms an upper opening at the outer surface of the tool holder body and a lower opening at the inner wall of the tool holder body; The upper surface of the locking piece is exposed through the upper opening and faces the avoiding space or the inner wall surface of the protruding part; The lower surface of the locking piece is exposed through the lower opening and faces the peripheral surface of the tool head or the locking groove.

14. The tool head quick change structure of claim 13, wherein, The caliber width of the upper opening is greater than that of the lower opening.

15. An electric power tool characterized by comprising: The tool head quick clamping structure includes any one of claims 1-14.

16. The power tool of claim 15, wherein, The tool head is a drill bit or a batch head.

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