Three-jaw chuck and machine tool
By designing a three-jaw chuck with a sliding connection jaw assembly, the problem of the inability to clamp square workpieces in the prior art is solved, and simple and efficient clamping of square workpieces is achieved.
Patent Information
- Application Number
- CN202421257637.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-04
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-06-04
AI Technical Summary
The existing three-claw chuck cannot effectively clamp square workpieces, resulting in high clamping difficulty and low efficiency.
A three-jaw chuck is designed, including a chuck body and three chuck assembly. The chuck assembly is arranged radially along the chuck body and is slidally connected to the chuck body. The second clamping surface and the third clamping surface are opposite to each other. And arranged in parallel to clamp square workpieces.
It realizes effective clamping of square workpieces, which is simple and easy to operate, reduces work difficulty and improves work efficiency.
Smart Images
Figure CN222449388U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of machine tools, in particular to a three-jaw chuck and a machine tool. Background Art
[0002] Three-jaw chucks are usually used to clamp round bar workpieces, but cannot clamp square workpieces. If you want to clamp square workpieces, you need a four-jaw chuck, which increases costs, increases the difficulty of clamping, and reduces work efficiency. Utility Model Content
[0003] The technical problem to be solved by the utility model is how to clamp a square workpiece on a three-jaw chuck.
[0004] The utility model provides a technical solution to the above-mentioned technical problems as follows: a three-jaw chuck, comprising a chuck body and three jaw assemblies, the three jaw assemblies are radially arranged along the chuck body and are slidably connected to the chuck body, the three jaw assemblies are respectively a first jaw assembly, a second jaw assembly and a third jaw assembly, the first jaw assembly has a first clamping surface, the second jaw assembly has a second clamping surface, the third jaw assembly has a third clamping surface, the second clamping surface and the third clamping surface are opposite to and parallel to each other, the first clamping surface is located on one side between the second clamping surface and the third clamping surface, and is perpendicular to the second clamping surface.
[0005] The beneficial effects of the utility model are as follows: a second clamping jaw assembly and a third clamping jaw assembly are installed on the three-jaw chuck, the second clamping surface and the third clamping surface are arranged opposite and in parallel, the second clamping surface and the third clamping surface clamp two parallel surfaces of a square workpiece, thereby realizing the clamping of the square workpiece, which is simple and easy to operate, reduces the work difficulty and improves the work efficiency.
[0006] On the basis of the above technical solution, the present invention can also be improved as follows.
[0007] Furthermore, three first grooves are formed on the chuck body, and the three first grooves are all arranged radially along the chuck body, and the three jaw assemblies are slidably matched with the three first grooves in a one-to-one correspondence.
[0008] The beneficial effect of adopting the above further scheme is: by opening three first grooves on the chuck body, the three jaw assemblies slide and cooperate with the three first grooves in a one-to-one correspondence, thereby realizing a sliding connection between the jaw assembly and the chuck body, so that the jaw assembly can be moved closer or farther away to realize the disassembly and assembly of the workpiece.
[0009] Furthermore, each of the claw assemblies includes a claw seat, a slider and a claw sleeve, the claw sleeve is detachably connected to the claw seat via the slider, the three claw seats are slidably matched with the three first grooves in a one-to-one correspondence, the claw sleeve of the first claw assembly has the first clamping surface, the claw sleeve of the second claw assembly has the second clamping surface, and the claw sleeve of the third claw assembly has the third clamping surface.
[0010] The beneficial effect of adopting the above further scheme is that the claw sleeve is detachably connected to the claw seat through the slider, so that by replacing the claw sleeve, the clamping of square or round workpieces can be achieved, which expands the application range of ordinary three-jaw chucks and improves the clamping efficiency of workpieces.
[0011] Furthermore, a second groove is formed on a side of the claw seat opposite to the chuck body, and the slider is clamped in the second groove.
[0012] The beneficial effect of adopting the above further solution is that the second groove realizes the positioning and connection of the claw seat and the slider.
[0013] Furthermore, the claw assembly also includes a connecting bolt, which passes through the claw sleeve and is threadedly connected to the slider, the claw seat has a claw seat serrated surface on the side facing the claw sleeve, and the claw sleeve has a claw sleeve serrated surface on the side facing the claw seat, and the claw seat serrated surface is meshed with the claw sleeve serrated surface.
[0014] The beneficial effect of adopting the above further scheme is: the connecting bolt enables a threaded connection between the claw sleeve and the slider, the connecting bolt is screwed and applies force to the claw sleeve, so that the serrated surface of the claw sleeve and the serrated surface of the claw seat are engaged and clamped, thereby limiting the relative sliding of the claw sleeve and the claw seat, and after the connecting bolt tightens the claw sleeve and the slider, the claw sleeve and the claw seat can be locked.
[0015] Furthermore, the second groove is a T-shaped groove or a dovetail groove, and the sliding block is a T-shaped block or a dovetail block adapted to the second groove.
[0016] The beneficial effect of adopting the above further solution is that the second groove and the slider are connected by a T-shaped or dovetail structure, so that the two can only move relative to each other along the length direction of the second groove, which can prevent the slider from falling out of the second groove.
[0017] Furthermore, a third groove is provided on a side of the claw sleeve facing the slider, and the slider abuts against the third groove.
[0018] The beneficial effect of adopting the above further solution is that the third groove is used to limit the relative position of the slider and the claw sleeve.
[0019] Further, the claw sleeve of the second jaw assembly is a second claw sleeve, the second claw sleeve includes a second clamping portion and a second fixing portion, one end of the second fixing portion is fixedly connected to the middle portion of one side of the second clamping portion, and the other side of the second clamping portion has the second clamping surface; the claw sleeve of the third jaw assembly is a third claw sleeve, the third claw sleeve includes a third clamping portion and a third fixing portion, one end of the third fixing portion is fixedly connected to the middle portion of one side of the third clamping portion, and the other side of the third clamping portion has the third clamping surface.
[0020] The beneficial effect of adopting the above further solution is that the second fixing portion and the third fixing portion are used to be connected to the chuck body, and the second clamping portion and the third clamping portion are used to clamp a workpiece.
[0021] Further, the claw sleeve of the first claw assembly is a first claw sleeve, and the first claw sleeve includes a first clamping portion and a first fixing portion, the first fixing portion is fixedly connected to one end of the first clamping portion, the other end surface of the first clamping portion is the first clamping surface, and the two sides of the first clamping portion gradually approach each other along the direction from one end to the other end.
[0022] The beneficial effect of adopting the above further solution is that the first clamping part, the second clamping part and the third clamping part cooperate with each other to complete the clamping of the workpiece, making the clamping more stable and the operation safer.
[0023] The utility model also provides a machine tool, comprising the three-jaw chuck.
[0024] The beneficial effect is that the three-jaw chuck can be used to process square workpieces, thereby improving the applicability of the machine tool. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 This is an assembly diagram of the three-jaw chuck of the utility model;
[0026] Figure 2 It is a three-dimensional diagram of the first claw assembly of the utility model;
[0027] Figure 3 It is a three-dimensional diagram of the second claw assembly of the utility model;
[0028] Figure 4 It is a three-dimensional diagram of the third claw assembly of the utility model;
[0029] Figure 5 It is a three-dimensional diagram of the chuck body of the utility model.
[0030] In the accompanying drawings, the components represented by the reference numerals are listed as follows:
[0031] 1. Chuck body; 2. First groove; 3. Second groove; 4. First threaded hole; 5. Second threaded hole; 6. Third groove; 10. First jaw assembly; 11. First jaw seat; 12. First slider; 13. First jaw sleeve; 20. Second jaw assembly; 21. Second jaw seat; 22. Second slider; 23. Second jaw sleeve; 30. Third jaw assembly; 31. Third jaw seat; 32. Third slider; 33. Third jaw sleeve. DETAILED DESCRIPTION
[0032] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.
[0033] like Figure 1-Figure 5 As shown, this embodiment provides a three-jaw chuck, including a chuck body 1 and three jaw assemblies, the three jaw assemblies are all radially arranged along the chuck body 1 and are slidably connected to the chuck body 1, the three jaw assemblies are respectively a first jaw assembly 10, a second jaw assembly 20 and a third jaw assembly 30, the first jaw assembly 10 has a first clamping surface, the second jaw assembly 20 has a second clamping surface, the third jaw assembly 30 has a third clamping surface, the second clamping surface and the third clamping surface are opposite and parallel to each other, the first clamping surface is located on one side between the second clamping surface and the third clamping surface, and is perpendicular to the second clamping surface.
[0034] By installing a jaw assembly with two parallel clamping surfaces on the three-jaw chuck, any two parallel surfaces of the square workpiece can be respectively abutted against the two parallel clamping surfaces, thereby clamping the square workpiece, which is simple and easy to operate, reduces work difficulty and improves work efficiency.
[0035] On the basis of the above technical solution, three first grooves 2 are formed on the chuck body 1 , and the three first grooves 2 are radially arranged along the chuck body 1 , and the three jaw assemblies are slidably matched with the three first grooves 2 in a one-to-one correspondence.
[0036] By opening three first grooves 2 on the chuck body 1, the three jaw assemblies slide and cooperate with the three first grooves 2 one by one, thereby realizing a sliding connection between the jaw assembly and the chuck body, so that the jaw assembly can move closer or farther away to realize the disassembly and assembly of the workpiece.
[0037] Based on any of the above schemes, each of the claw assemblies includes a claw seat, a slider and a claw sleeve, the claw sleeve is detachably connected to the claw seat through the slider, the three claw seats are slidably matched with the three first grooves 2 in a one-to-one correspondence, the claw sleeve of the first claw assembly 10 has the first clamping surface, the claw sleeve of the second claw assembly 20 has the second clamping surface, and the claw sleeve of the third claw assembly 30 has the third clamping surface.
[0038] Specifically, the first claw assembly 10 includes a first claw seat 11, a first slider 12 and a first claw sleeve 13, and the first claw sleeve 13 is detachably connected to the first claw seat 11 through the first slider 12; the second claw assembly 20 includes a second claw seat 21, a second slider 22 and a second claw sleeve 23, and the second claw sleeve 23 is detachably connected to the second claw seat 21 through the second slider 22; the third claw assembly 30 includes a third claw seat 31, a third slider 32 and a third claw sleeve 33, and the third claw sleeve 33 is detachably connected to the third claw seat 31 through the third slider 32; the first claw seat 11, the second claw seat 21 and the third claw seat 31 are slidably matched with the three first grooves 2 in a one-to-one correspondence.
[0039] The claw sleeve is detachably connected to the claw seat through the slider, so that by replacing the claw sleeve, square or round workpieces can be clamped, which expands the application range of ordinary three-jaw chucks and improves the clamping efficiency of workpieces. In addition, by loosening the connecting bolt, the relative position of the claw sleeve and the claw seat can be adjusted, and then tightening the connecting bolt to fix the claw sleeve and the claw seat, which is simple to operate.
[0040] On the basis of any of the above solutions, a second groove 3 is formed on a side of the claw seat opposite to the chuck body 1 , and the slider is clamped in the second groove 3 .
[0041] The connection between the claw seat and the slider is achieved by the slider being clamped in the second groove 3 .
[0042] Based on any of the above schemes, the clamping claw assembly also includes a connecting bolt, which passes through the claw sleeve and is threadedly connected to the slider, the claw seat has a claw seat serrated surface on the side facing the claw sleeve, and the claw sleeve has a claw sleeve serrated surface on the side facing the claw seat, and the claw seat serrated surface is meshed with the claw sleeve serrated surface.
[0043] Specifically, the first jaw assembly 10 includes a first connecting bolt, the second jaw assembly 20 includes a second connecting bolt, and the third jaw assembly 30 includes a third connecting bolt. The first slider 12, the second slider 22, and the third slider 32 are all provided with a first threaded hole 4, the first claw sleeve 13, the second claw sleeve 23, and the third claw sleeve 33 are all provided with a second threaded hole 5, the first claw seat 11 has a first claw seat serrated surface on the side facing the first claw sleeve 13, the first claw sleeve 13 has a first claw sleeve serrated surface on the side facing the first claw seat 11, the second claw seat 21 has a second claw seat serrated surface on the side facing the second claw sleeve 23, the second claw sleeve 23 has a second claw sleeve serrated surface on the side facing the second claw seat 21, the third claw seat 31 has a third claw seat serrated surface on the side facing the third claw sleeve 33, and the third claw sleeve 33 has a third claw sleeve serrated surface on the side facing the third claw seat 31. The first connecting bolt passes through the first claw sleeve 13 and is threadedly connected to the first slider 12, and the serrated surface of the first claw seat is meshed with the serrated surface of the first claw sleeve; the second connecting bolt passes through the second claw sleeve 23 and is threadedly connected to the second slider 22, and the serrated surface of the second claw seat is meshed with the serrated surface of the second claw sleeve; the third connecting bolt passes through the third claw sleeve 33 and is threadedly connected to the third slider 32, and the serrated surface of the third claw seat is meshed with the serrated surface of the third claw sleeve.
[0044] Specifically, the first connecting bolt, the second connecting bolt and the third connecting bolt are at least one. When the first connecting bolt, the second connecting bolt and the third connecting bolt are at least two, at least two second threaded holes 5 are spaced apart along the length direction on the first claw sleeve 13, the second claw sleeve 23 and the third claw sleeve 33, and correspondingly, at least two first threaded holes 4 are spaced apart along the length direction on the first slider 12, the second slider 22 and the third slider 32, and the connecting bolt passes through the second threaded hole 5 and the first threaded hole 4 in sequence. The connecting bolt is screwed and applies force to the claw sleeve, so that the claw sleeve serrated surface and the claw seat serrated surface of the claw seat are meshed and clamped, limiting the relative sliding of the claw sleeve and the claw seat. After the connecting bolt tightens the claw sleeve and the slider, the claw sleeve and the claw seat can be locked. The first connecting bolt, the second connecting bolt and the third connecting bolt are hexagon socket bolts.
[0045] The claw sleeve is threadedly connected to the slider by connecting bolts. Since the slider is clamped in the claw seat, the claw seat and the claw sleeve are tightened and matched through the serrated surface. The serrated surface of the claw seat meshes with the serrated surface of the claw sleeve. The claw sleeve and the slider are threadedly connected by bolts. The bolts are screwed to apply force to the claw sleeve, so that the claw sleeve and the claw seat are meshed more tightly to achieve a fixed connection, so that the claw seat, the slider and the claw sleeve slide as a whole in the first groove 2 of the chuck body 1, so as to achieve the disassembly and assembly of the workpiece.
[0046] On the basis of any of the above solutions, the second groove 3 is a T-shaped groove or a dovetail groove, and the sliding block is a T-shaped block or a dovetail block matched with the second groove 3 .
[0047] In a specific example, the second groove 3 is a T-shaped groove, and the sliding block is a T-shaped block matched with the second groove 3 .
[0048] like Figure 2 In the embodiment, the second groove 3 is a T-shaped groove, the first sliding block 12 is a T-shaped block, and the first sliding block 12 is adapted to the second groove 3 .
[0049] like Figure 3 In the embodiment, the second groove 3 is a T-shaped groove, the second sliding block 22 is a T-shaped block, and the second sliding block 22 is adapted to the second groove 3 .
[0050] like Figure 4 In the embodiment, the second groove 3 is a T-shaped groove, the third slider 32 is a T-shaped block, and the third slider 32 is adapted to the second groove 3 .
[0051] On the basis of any of the above solutions, a third groove 6 is provided on the side of the claw sleeve facing the slider, and the slider abuts against the third groove 6 .
[0052] Specifically, the abutting surface between the first claw sleeve 13 and the first slider 12 is provided with a third groove 6, and the first slider 12 abuts against the third groove 6; the abutting surface between the second claw sleeve 23 and the second slider 22 is provided with a third groove 6, and the second slider 22 abuts against the third groove 6; the abutting surface between the third claw sleeve 33 and the third slider 32 is provided with a third groove 6, and the third slider 32 abuts against the third groove 6.
[0053] The slider abuts against the third groove 6, and the slider is clamped in the claw sleeve, thereby limiting the radial movement of the slider.
[0054] On the basis of any of the above schemes, the claw sleeve of the second jaw assembly 20 is a second claw sleeve 23, the second claw sleeve 23 includes a second clamping part and a second fixing part, one end of the second fixing part is fixedly connected to the middle part of one side of the second clamping part, and the other side of the second clamping part has the second clamping surface; the claw sleeve of the third jaw assembly 30 is a third claw sleeve 33, the third claw sleeve 33 includes a third clamping part and a third fixing part, one end of the third fixing part is fixedly connected to the middle part of one side of the third clamping part, and the other side of the third clamping part has the third clamping surface.
[0055] In the specific examples, Figure 3-Figure 5 As shown in , the three jaw assemblies are evenly distributed along the circumference of the chuck body 1, the second clamping portion and the second fixing portion form an angle of 60°, and the third clamping portion and the third fixing portion form an angle of 60°. The symmetric center plane of the second clamping surface and the third clamping surface passes through the center of the chuck body 1.
[0056] The second fixing part and the third fixing part are used to connect with the chuck body 1, and the second clamping part and the third clamping part are used to clamp the workpiece. After the square workpiece is clamped, the left and right center lines of the workpiece pass through the center of the three-jaw chuck symmetrically, so as to facilitate the rapid alignment of the workpiece.
[0057] In this embodiment, the first jaw sleeve 13 is a jaw sleeve of an ordinary three-jaw chuck. After completing the processing of the square workpiece, since the jaw sleeve is detachably connected to the jaw seat through a slider, the second jaw sleeve 23 and the third jaw sleeve 33 are replaced with jaw sleeves of an ordinary three-jaw chuck, and then the processing of the circular workpiece can be continued, which improves the applicability of the three-jaw chuck and thus improves work efficiency.
[0058] Optionally, the three jaw assemblies are unevenly distributed along the circumference of the chuck body 1, for example, the angle between the second jaw assembly 20 and the third jaw assembly 30 is 180°, the first jaw assembly 10 is between the second jaw assembly 20 and the third jaw assembly 30, the second clamping portion and the second fixing portion form an angle of 90°, and the third clamping portion and the third fixing portion form an angle of 90°. Alternatively, the three jaw assemblies may also be arranged in other ways, the angle between the second clamping portion and the second fixing portion may be other angles, and the angle between the third clamping portion and the third fixing portion may be other angles.
[0059] Based on any of the above schemes, the claw sleeve of the first clamping claw assembly 10 is a first claw sleeve 13, and the first claw sleeve 13 includes a first clamping portion and a first fixing portion, the first fixing portion is fixedly connected to one end of the first clamping portion, and the other end face of the first clamping portion is the first clamping face, and the two sides of the first clamping portion gradually approach each other along the direction from one end to the other end.
[0060] The first clamping portion, the second clamping portion and the third clamping portion cooperate together to complete the clamping of the workpiece, making the clamping more stable and the operation safer.
[0061] This embodiment also provides a machine tool, including the three-jaw chuck.
[0062] The three-jaw chuck can be used to process round and square workpieces, thereby improving the applicability of the machine tool.
[0063] In the description of the present invention, it is necessary to understand that the terms "center", "length", "left", "right", "radial" and "circumferential" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0064] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0065] In the present invention, unless otherwise clearly defined and specified, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0066] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0067] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0068] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.
Claims
1. A three-jaw chuck, characterized in that: The invention comprises a chuck body (1) and three jaw assemblies, wherein the three jaw assemblies are radially arranged along the chuck body (1) and are slidably connected to the chuck body (1), and the three jaw assemblies are respectively a first jaw assembly (10), a second jaw assembly (20) and a third jaw assembly (30), wherein the first jaw assembly (10) has a first clamping surface, the second jaw assembly (20) has a second clamping surface, and the third jaw assembly (30) has a third clamping surface, the second clamping surface and the third clamping surface are arranged opposite to and in parallel, and the first clamping surface is located on one side between the second clamping surface and the third clamping surface, and is perpendicular to the second clamping surface.
2. A three-jaw chuck according to claim 1, characterized in that: The chuck body (1) is provided with three first grooves (2), the three first grooves (2) are all arranged radially along the chuck body (1), and the three clamping jaw assemblies are slidably matched with the three first grooves (2) in a one-to-one correspondence.
3. A three-jaw chuck according to claim 2, characterized in that: Each of the claw assemblies comprises a claw seat, a slider and a claw sleeve, the claw sleeve being detachably connected to the claw seat via the slider, the three claw seats being slidingly matched with the three first grooves (2) in a one-to-one correspondence, the claw sleeve of the first claw assembly (10) having the first clamping surface, the claw sleeve of the second claw assembly (20) having the second clamping surface, and the claw sleeve of the third claw assembly (30) having the third clamping surface.
4. A three-jaw chuck according to claim 3, characterized in that: A second groove (3) is provided on a side of the claw seat opposite to the chuck body (1), and the sliding block is clamped in the second groove (3).
5. A three-jaw chuck according to claim 4, characterized in that: The clamping claw assembly also includes a connecting bolt, which passes through the claw sleeve and is threadedly connected to the slider. The claw seat has a claw seat serrated surface on the side facing the claw sleeve, and the claw sleeve has a claw sleeve serrated surface on the side facing the claw seat, and the claw seat serrated surface is meshed with the claw sleeve serrated surface.
6. A three-jaw chuck according to claim 5, characterized in that: The second groove (3) is a T-shaped groove or a dovetail groove, and the sliding block is a T-shaped block or a dovetail block that matches the second groove (3).
7. A three-jaw chuck according to any one of claims 3 to 6, characterized in that: A third groove (6) is provided on the side of the claw sleeve facing the slider, and the slider abuts against the third groove (6).
8. A three-jaw chuck according to claim 3, characterized in that: The claw sleeve of the second jaw assembly (20) is a second claw sleeve (23), the second claw sleeve (23) includes a second clamping portion and a second fixing portion, one end of the second fixing portion is fixedly connected to the middle portion of one side of the second clamping portion, and the other side of the second clamping portion has the second clamping surface; the claw sleeve of the third jaw assembly (30) is a third claw sleeve (33), the third claw sleeve (33) includes a third clamping portion and a third fixing portion, one end of the third fixing portion is fixedly connected to the middle portion of one side of the third clamping portion, and the other side of the third clamping portion has the third clamping surface.
9. A three-jaw chuck according to claim 3, characterized in that: The claw sleeve of the first clamping claw assembly (10) is a first claw sleeve (13), and the first claw sleeve (13) includes a first clamping portion and a first fixing portion, the first fixing portion is fixedly connected to one end of the first clamping portion, the other end surface of the first clamping portion is the first clamping surface, and the two sides of the first clamping portion gradually approach each other along the direction from one end to the other end.
10. A machine tool, characterized in that: A three-jaw chuck comprising any one of claims 1 to 9.