Clamping and pulling-down two-section type chuck

Abstract

The utility model provides a clamping and pulling-down two-section type chuck, and relates to the technical field of chuck related structures for machine tools, the clamping and pulling-down two-section type chuck comprises a chuck body and a plurality of clamping structures, and the plurality of clamping structures define a clamping space for clamping parts; each clamping structure comprises a base, a clamping block and a limiting piece, and the base is connected with the disc body; the clamping block is provided with a contact face used for being in sliding connection with the base, the contact face is arranged to be an inclined face or a conical face, and the clamping block is used for being in sliding connection with the base in the inclined direction of the contact face. The limiting piece is connected with the clamping block, and the clamping block is used for being fixed relative to the base through the limiting piece. According to the utility model, the problems of unstable use precision, unstable clamping of a short step workpiece and the like caused by a relatively complex structure for pulling down a part in the prior art are solved, and the technical problem that the short step workpiece is very inconvenient to mount, dismount and maintain is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of chuck-related structures for machine tools, in particular to a two-stage chuck for clamping and then pulling down. Background Art

[0002] With the continuous development of science and technology, the machining accuracy requirements for mechanical parts are getting higher and higher. In mechanical processing, in order to prevent the workpiece from shifting during the processing and thus affecting the processing accuracy, the processing of most parts depends on the clamping device to accurately and reliably position and clamp them to ensure the processing accuracy of the parts.

[0003] In the existing technology, common chucks mainly achieve the clamping and loosening of parts by radial movement of the clamping jaws, and achieve the pulling down through other structures; and the emergence of the pulling down function improves the impact of the floating jaws to a certain extent, thereby ensuring the accuracy of the parts on the Z axis and the reliability of clamping.

[0004] However, the existing structure for pulling down parts is relatively complex, which causes problems such as unstable usage accuracy, unstable clamping of short-step workpieces, etc., and is very inconvenient to install, disassemble and repair this structure. Utility Model Content

[0005] The purpose of this utility model is to provide a two-stage chuck that clamps and then pulls down, so as to alleviate the problems existing in the prior art such as unstable usage accuracy, unstable clamping of short-step workpieces, etc. due to the complex structure for pulling down parts, as well as the technical problems of being very inconvenient during installation, disassembly and maintenance.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] In a first aspect, the utility model provides a two-stage clamping and pulling-down chuck, comprising a chuck body and a plurality of clamping structures, wherein the plurality of clamping structures enclose a clamping space for clamping parts;

[0008] Each of the clamping structures includes a base, a clamping block and a limiting member, and the base is connected to the disc body;

[0009] The clamping block is provided with a contact surface for sliding connection with the base, and the contact surface is set as an inclined surface or a conical surface, and the clamping block is used to slide and connect with the base along the inclined direction of the contact surface;

[0010] The limiting member is connected to the clamping block, and the clamping block is used to be fixed relative to the base through the limiting member.

[0011] Furthermore, there is an angle between the contact surface and the bottom surface of the clamping block, and the angle is an acute angle.

[0012] Furthermore, the clamping structure further includes a spring sheet, which is arranged between the clamping block and the base, and is used for elastically deforming when the clamping block clamps the part.

[0013] Furthermore, the base is provided with a supporting portion, and the elastic sheet is provided between the supporting portion and the clamping block.

[0014] Furthermore, one end of the clamping block is provided with a clamping portion for clamping the part, and the other end is provided with the limiting member, and the limiting member includes a limiting slider slidably connected to the base;

[0015] The clamping structure further includes a connecting component, one end of which passes through the base and is connected to the clamping block.

[0016] Furthermore, the connecting assembly includes a connecting piece and an elastic piece, one end of the connecting piece passes through the base and is connected to the clamping block, and the other end of the connecting piece abuts against the base;

[0017] The elastic member is sleeved on the outside of the connecting member, and one end of the elastic member is connected to the base, and the other end is connected to the clamping block.

[0018] Furthermore, the base is provided with a fixing hole, and the base is used to be connected to the disk body by an external fixing member passing through the fixing hole;

[0019] The base is provided with a hole, and one end of the connecting piece is inserted into the hole and passes through the base to be connected with the clamping block;

[0020] The fixing hole is perpendicular to the hole.

[0021] Furthermore, the spring sheet includes a connecting portion and bent portions at both ends of the connecting portion, and the connecting portion is supported on the bottom of the clamping block;

[0022] The bending portion is arranged on the top of the supporting portion.

[0023] Furthermore, the limiting member includes a limiting connecting member, which passes through the clamping block and is connected to the base, and the limiting connecting member is used to fix the clamping block relative to the base.

[0024] Furthermore, the elastic sheet includes an annular connecting portion and a bending portion arranged along the circumference of the outer wall of the connecting portion;

[0025] The annular connecting portion is sleeved on the outside of the limiting connecting piece, and the connecting portion is supported on the bottom of the clamping block;

[0026] The bent portion abuts against the base.

[0027] The utility model can achieve the following beneficial effects:

[0028] In the first aspect, the utility model provides a two-stage chuck for clamping and then pulling down, comprising a disc body and a plurality of clamping structures, wherein the plurality of clamping structures enclose a clamping space for clamping parts; each clamping structure comprises a base, a clamping block and a limit member, and the base is connected to the disc body; the clamping block is provided with a contact surface for sliding connection with the base, and the contact surface is set as an inclined surface or a conical surface, and the clamping block is used to slide connected with the base along the inclined direction of the contact surface; the limit member is connected to the clamping block, and the clamping block is used to be fixed relative to the base through the limit member.

[0029] In the utility model, a plurality of clamping structures are provided on the disk body along its axial direction, and a clamping space for clamping parts is enclosed by the plurality of clamping structures, and each clamping structure includes a base and a clamping block, the base is used to be connected to the disk body, and the clamping block is connected to the base; when in use, the base and the clamping block can be movably connected within a certain range, specifically by sliding along the base through an inclined contact surface, and the movable range is adjusted by a limit member to change the size of the clamping space, thereby achieving a stable clamping effect.

[0030] Compared with the prior art, the utility model provides a two-stage chuck for clamping and then pulling down, which is provided with multiple clamping structures on the disc body to enclose a clamping space for clamping parts, and each clamping structure includes a base and a clamping block, and the base and the clamping block can be connected and moved relative to each other, sliding along the base through the inclined contact surface, and then using a limiter to limit the movement range to achieve a stable clamping effect, and the structure of the base and the clamping block is relatively simple, thereby avoiding inconvenience during installation, disassembly or maintenance.

[0031] In summary, the utility model at least alleviates the problems existing in the prior art, such as unstable usage accuracy, unstable clamping of short-step workpieces, etc., caused by the complex structure of pulling down parts, as well as the technical problems of being very inconvenient in installation, disassembly and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1This is a schematic diagram of the three-dimensional structure of a two-stage chuck for clamping and then pulling down provided in Example 1 of the present utility model;

[0034] Figure 2 A schematic diagram of the three-dimensional structure of the clamping portion of a two-stage chuck for clamping and then pulling down provided in Example 1 of the present utility model;

[0035] Figure 3 A schematic top view of the structure of the clamping portion of a two-stage chuck for clamping and then pulling down provided in Example 1 of the present utility model;

[0036] Figure 4 for Figure 3 Schematic diagram of the AA cross-section structure of the clamping part in the unclamped state;

[0037] Figure 5 for Figure 4 A magnified schematic diagram of the structure of part B;

[0038] Figure 6 for Figure 3 Schematic diagram of the AA cross-section structure of the clamping part in the clamping state;

[0039] Figure 7 for Figure 6 A magnified schematic diagram of the C-section structure;

[0040] Figure 8 A schematic diagram of the three-dimensional structure of a spring piece of a two-stage chuck that is clamped and then pulled down, provided in the first embodiment of the present invention;

[0041] Figure 9 A schematic diagram of the three-dimensional structure of a two-stage chuck for clamping and then pulling down provided in the second embodiment of the present invention;

[0042] Figure 10 A schematic diagram of the three-dimensional structure of the clamping portion of a two-stage chuck for clamping and then pulling down provided in the second embodiment of the present invention;

[0043] Figure 11 A schematic top view of the clamping portion of a two-stage chuck for clamping and then pulling down provided in the second embodiment of the present invention;

[0044] Figure 12 for Figure 11 Schematic diagram of the DD cross-sectional structure of the clamping part in the unclamped state;

[0045] Figure 13 A schematic diagram of the three-dimensional structure of a spring piece of a two-stage chuck that is clamped and then pulled down, provided in the second embodiment of the present invention;

[0046] Figure 14A schematic cross-sectional view of a two-stage chuck for clamping and then pulling down provided in the third embodiment of the present invention;

[0047] Figure 15 A schematic diagram of the three-dimensional structure of a two-stage chuck for clamping and then pulling down provided in the fourth embodiment of the present utility model;

[0048] Figure 16 This is a schematic diagram of the top view of the clamping part of a two-stage chuck that clamps and then pulls down, provided in Example 5 of the present utility model.

[0049] Icon: 1-base; 11-support part; 12-fixing hole; 13-hole; 2-clamping block; 21-clamping part; 22-limiting slider; 23-contact surface; 3-disc body; 31-guide slot; 32-guide block; 4-connecting assembly; 41-connecting part; 42-elastic part; 5-spring; 51-connecting part; 52-bending part; 6-limiting connecting part. DETAILED DESCRIPTION

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0051] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0052] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0053] In the description of this utility model, it should be noted that the terms "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0054] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0055] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0056] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0057] Example 1

[0058] This embodiment provides a two-stage chuck that clamps and then pulls down. Figure 1 The clamping and then pulling-down two-stage chuck includes a disc body 3 and multiple clamping structures, and the multiple clamping structures enclose a clamping space for clamping parts; each clamping structure includes a base 1, a clamping block 2 and a limiter, and the base 1 is connected to the disc body 3; the clamping block 2 is provided with a contact surface 23 for sliding connection with the base 1, and the contact surface 23 is set as an inclined surface, and the clamping block 2 is used to slide with the base 1 along the inclined direction of the contact surface 23; the limiter is connected to the clamping block 2, and the clamping block 2 is used to be fixed relative to the base 1 through the limiter.

[0059] The embodiments of the present utility model at least alleviate the problems existing in the prior art such as unstable usage accuracy, unstable clamping of short-step workpieces, etc. caused by the complex structure for pulling down parts, as well as the technical problems of being very inconvenient in installation, disassembly and maintenance.

[0060] In an embodiment of the present utility model, a plurality of clamping structures are provided on the disk body 3 along its axial direction, and a clamping space for clamping parts is enclosed by the plurality of clamping structures, and each clamping structure includes a base 1 and a clamping block 2, the base 1 is used to be connected to the disk body 3, and the clamping block 2 is connected to the base 1; when in use, the base 1 and the clamping block 2 can be movably connected within a certain range, specifically by sliding along the base 1 through the inclined contact surface 23, and the movable range is adjusted by the limit member to change the size of the clamping space, thereby achieving a stable clamping effect.

[0061] Compared with the prior art, the embodiment of the utility model provides a two-stage chuck for clamping and then pulling down, which is provided with multiple clamping structures on the disc body 3 to enclose a clamping space for clamping parts, and each clamping structure includes a base 1 and a clamping block 2, and the base 1 and the clamping block 2 can be connected to each other for relative movement, and slide along the base 1 through the inclined contact surface 23, and then use a limiter to limit the movement range to achieve a stable clamping effect, and the structure of the base 1 and the clamping block 2 is relatively simple, thereby avoiding inconvenience during installation, disassembly or maintenance.

[0062] In an optional implementation manner of this embodiment, refer to Figure 1 or Figure 2 There is an angle between the contact surface 23 and the bottom surface of the clamping block 2, and the angle is an acute angle.

[0063] Specifically: there is an angle between the contact surface 23 and the bottom surface of the clamping block 2, and preferably, the angle is an acute angle; when in use, since the angle between the contact surface 23 and the bottom surface of the clamping block 2 is an acute angle, during the pulling-down process, the clamping block 2 moves along the inclined direction of the contact surface 23, that is, the clamping block 2 moves obliquely upward relative to the base 1, so as to clamp the part during the pulling-down process.

[0064] Further, refer to Figure 4 or Figure 5 The clamping structure also includes a spring piece 5, which is arranged between the clamping block 2 and the base 1. The spring piece 5 is used to elastically deform when the clamping block 2 clamps the part.

[0065] Specifically: the spring piece 5 is arranged between the clamping block 2 and the base 1. Preferably, the spring piece 5 is arranged in the moving direction of the clamping block 2, so that when the clamping block 2 clamps the part, the clamping block 2 moves toward the base 1. At this time, the spring piece 5 is squeezed, causing it to undergo elastic deformation. When the force disappears, the spring piece 5 pushes the clamping block 2 to return to its original position due to its own elasticity.

[0066] Further, refer to Figure 4 and Figure 6 The base 1 is provided with a supporting portion 11 , and a spring piece 5 is provided between the supporting portion 11 and the clamping block 2 .

[0067] Specifically: the base 1 is provided with a support portion 11, and the support portion 11 protrudes from the base 1, and the bottom of the clamping block 2 is provided on the support portion 11, and a spring 5 is provided between the support portion 11 and the clamping block 2; Figure 5 and Figure 7 When in use, the clamping block 2 moves toward the supporting portion 11 and presses the spring sheet 5 to cause it to deform.

[0068] Further, refer to Figure 2 or Figure 3 One end of the clamping block 2 is provided with a clamping portion 21 for clamping parts, and the other end is provided with a limit member, which includes a limit slider 22 slidably connected to the base 1; the clamping structure also includes a connecting component 4, one end of the connecting component 4 passes through the base 1 and is connected to the clamping block 2.

[0069] Specifically: a clamping portion 21 is provided at one end of the clamping block 2, and a limiting member is provided at the end opposite to the clamping portion 21, and this limiting member includes a limiting slider 22. Accordingly, a limiting slot is provided on the base 1, and the limiting slider 22 is slid into this limiting slot to enable the clamping block 2 to move only in the extension direction of the limiting slot; in the other direction, one end of the connecting component 4 passes through the base 1 and is connected to the clamping block 2, that is, the end of the connecting component 4 is fixedly connected to the clamping block 2, and the base 1 limits the end of the connecting component 4 away from the clamping block 2.

[0070] Further, refer to Figure 4 or Figure 6 The connecting component 4 includes a connecting member 41 and an elastic member 42. One end of the connecting member 41 passes through the base 1 and is connected to the clamping block 2, and the other end of the connecting member 41 abuts against the base 1; the elastic member 42 is sleeved on the outside of the connecting member 41, and one end of the elastic member 42 is connected to the base 1, and the other end is connected to the clamping block 2.

[0071] Specifically: one end of the connecting member 41 passes through the base 1 and is connected to the clamping block 2, and preferably, the connecting member 41 can be a screw, and the nut of the screw is limitedly connected to the base 1; and the elastic member 42 is arranged between the base 1 and the clamping block 2, and the elastic member 42 is preferably a spring, and the spring is sleeved on the outside of the connecting member 41, and the elastic force of the spring pushes the clamping block 2 to move in the direction away from the base 1 when not in use.

[0072] Further, refer to Figure 4 or Figure 6 The base 1 is provided with a fixing hole 12, and the base 1 is used to connect to the disk body 3 through an external fixing part passing through the fixing hole 12; the base 1 is provided with a hole 13, and one end of the connecting part 41 is inserted into the hole 13 and passes through the base 1 to be connected with the clamping block 2; the fixing hole 12 is perpendicular to the hole 13.

[0073] Specifically: the base 1 is provided with a fixing hole 12, there can be two fixing holes 12, and the two fixing holes 12 are arranged in the vertical direction for connecting to the disk body 3 through external bolts and other components; and the base 1 is provided with a hole 13 in the horizontal direction, and the hole 13 can pass through the two fixing holes in sequence to facilitate the passage of the screw-shaped connecting member 41 and limit the nut of the screw.

[0074] In an optional implementation manner of this embodiment, refer to Figure 8 The spring piece 5 includes a connecting portion 51 and bending portions 52 at both ends of the connecting portion 51 . The connecting portion 51 is supported at the bottom of the clamping block 2 ; the bending portion 52 is arranged at the top of the supporting portion 11 .

[0075] Specifically: the connecting portion 51 can be a rectangular ring-shaped structure, and both ends of the connecting portion 51 are provided with a bending portion 52 that bends downward; preferably, the connecting portion 51 and the bending portion 52 are integrally formed, and a groove is provided at the bottom of the clamping block 2 for fixing the connecting portion 51; when in use, the connecting portion 51 and the bending portion 52 are deformed by pressing down the clamping block 2.

[0076] Example 2

[0077] In an optional implementation manner of this embodiment, refer to Figure 9 、 Figure 10 or Figure 11 The limiting member includes a limiting connecting member 6, which passes through the clamping block 2 and is connected to the base 1, and the limiting connecting member 6 is used to fix the clamping block 2 relative to the base 1.

[0078] Specifically: the limiting connector 6 can be a trapezoidal cylindrical structure, and the limiting connector 6 passes through the clamping block 2 and is inserted into the base 1, and a spring piece 5 is provided between the clamping block 2 and the base 1; and a bolt can be provided in the limiting connector 6 to fix the limiting connector 6 relative to the base 1.

[0079] Further, refer to Figure 12 or Figure 13 The spring piece 5 includes an annular connecting portion 51 and a bending portion 52 arranged along the circumference of the outer wall of the connecting portion 51; the annular connecting portion 51 is sleeved on the outside of the limiting connecting member 6, and the connecting portion 51 is supported on the bottom of the clamping block 2; the bending portion 52 abuts against the base 1.

[0080] Specifically: the spring piece 5 includes an annular connecting portion 51 and a bent portion 52 arranged along the circumference of the outer wall of the connecting portion 51; the annular connecting portion 51 is sleeved on the outside of the limiting connecting piece 6, and the upper surface of the connecting portion 51 is supported on the bottom surface of the protruding portion of the clamping block 2, and the bent portion 52 is connected to the connecting portion 51 along the circumference and bent downward, and the bottom of the bent portion 52 is in contact with the base 1.

[0081] In an optional implementation manner of this embodiment, refer to Figure 9 The disc body 3 is provided with a plurality of guide slots 31 , and each guide slot 31 is provided with a guide block 32 ; the guide block 32 is detachably connected to the corresponding base 1 .

[0082] Specifically: the disk body 3 is provided with a plurality of guide slots 31, and the plurality of guide slots 31 are distributed at intervals along the circumference of the disk body 3, and each guide slot 31 is provided with a guide block 32, which slides in along the extension direction of the guide slot 31 and is connected by external screws to fix the guide block 32 to the disk body 3.

[0083] Example 3

[0084] In an optional implementation manner of this embodiment, refer to Figure 14 The thickness of the protruding portion of the clamping block 2 is increased so that the top of the protruding portion of the clamping block 2 can abut against the bottom of the limiting connecting member 6 without the spring sheet 5, and the bottom of the protruding portion of the clamping block 2 can abut against the top of the supporting portion 11 of the base 1.

[0085] Example 4

[0086] In an optional implementation manner of this embodiment, refer to Figure 15 The clamping block 2 is connected to the base 1, and the clamping portion 21 of the clamping block 2 is oriented away from the disc body 3, so that when clamping a larger workpiece, the clamping action from outside to inside can be changed to an inner supporting action from inside to outside.

[0087] Example 5

[0088] In an optional implementation manner of this embodiment, refer to Figure 16 The contact surface 23 of the clamping block 2 is a conical surface, and the angle between the longitudinal section of the conical surface and the bottom surface of the clamping block 2 is an acute angle.

[0089] Finally, it should be noted that: the various embodiments in this specification can also be used for ball joint power chucks; the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other; the above embodiments in this specification are only used to illustrate the technical solution of the utility model, rather than to limit it; although the utility model is described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that: it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some or all of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the various embodiments of the utility model.

Claims

1. A two-stage clamping and pulling-down chuck, characterized in that: It comprises a disc body (3) and a plurality of clamping structures, wherein the plurality of clamping structures enclose a clamping space for clamping parts; Each of the clamping structures comprises a base (1), a clamping block (2) and a limiting member, and the base (1) is connected to the disc body (3); The clamping block (2) is provided with a contact surface (23) for sliding connection with the base (1), and the contact surface (23) is set as an inclined surface or a conical surface, and the clamping block (2) is used to slide and connect with the base (1) along the inclined direction of the contact surface (23); The limiting member is connected to the clamping block (2), and the clamping block (2) is used to be fixed relative to the base (1) through the limiting member.

2. A two-stage clamping and pulling-down chuck according to claim 1, characterized in that: There is an angle between the contact surface (23) and the bottom surface of the clamping block (2), and the angle is an acute angle.

3. A two-stage clamping and pulling-down chuck according to claim 2, characterized in that: The clamping structure further comprises a spring sheet (5), which is arranged between the clamping block (2) and the base (1). The spring sheet (5) is used to elastically deform when the clamping block (2) clamps the part and reset the clamping block (2).

4. A two-stage clamping and pulling-down chuck according to claim 3, characterized in that: The base (1) is provided with a support portion (11), and the spring piece (5) is provided between the support portion (11) and the clamping block (2).

5. A two-stage clamping and pulling-down chuck according to claim 4, characterized in that: One end of the clamping block (2) is provided with a clamping portion (21) for clamping the part, and the other end is provided with the limiting member, wherein the limiting member includes a limiting slider (22) slidably connected to the base (1); The clamping structure further comprises a connecting component (4), one end of which passes through the base (1) and is connected to the clamping block (2).

6. A two-stage clamping and pulling-down chuck according to claim 5, characterized in that: The connecting assembly (4) comprises a connecting piece (41) and an elastic piece (42), one end of the connecting piece (41) passes through the base (1) and is connected to the clamping block (2), and the other end of the connecting piece (41) abuts against the base (1); The elastic member (42) is sleeved on the outside of the connecting member (41), and one end of the elastic member (42) is connected to the base (1), and the other end is connected to the clamping block (2).

7. A two-stage clamping and pulling-down chuck according to claim 6, characterized in that: The base (1) is provided with a fixing hole (12), and the base (1) is used to connect to the disk body (3) by passing an external fixing member through the fixing hole (12); The base (1) is provided with a hole (13), and one end of the connecting member (41) is inserted into the hole (13) and passes through the base (1) to be connected to the clamping block (2); The fixing hole (12) is perpendicular to the hole (13).

8. A two-stage clamping and pulling-down chuck according to any one of claims 4 to 7, characterized in that: The spring piece (5) comprises a connecting portion (51) and bent portions (52) at both ends of the connecting portion (51), and the connecting portion (51) is supported on the bottom of the clamping block (2); The bending portion (52) is arranged on the top of the supporting portion (11).

9. The clamping and then pulling down two-stage chuck according to claim 3, characterized in that: The limiting member comprises a limiting connecting member (6), which passes through the clamping block (2) and is connected to the base (1), and the limiting connecting member (6) is used to fix the clamping block (2) relative to the base (1).

10. The clamping and then pulling down two-stage chuck according to claim 9, characterized in that: The spring piece (5) comprises an annular connecting portion (51) and a bending portion (52) arranged along the circumference of the outer wall of the connecting portion (51); The annular connecting portion (51) is sleeved on the outside of the position-limiting connecting piece (6), and the connecting portion (51) is supported on the bottom of the clamping block (2); The bent portion (52) abuts against the base (1).

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