Clamping and pulling-down two-stage chuck and machine tool

Abstract

A clamping and pulling-down two-stage chuck and a machine tool. The clamping and pulling-down two-stage chuck comprises a chuck body (3) and a plurality of clamping structures, and the plurality of clamping structures define a clamping space for clamping a part; 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 chuck body (3); the clamping block (2) is provided with a contact surface (23) used for being slidably connected to the base (1), the contact surface (23) is configured as an inclined surface or a conical surface, and the clamping block (2) is used for being slidably connected to the base (1) in the inclined direction of the contact surface (23); and the limiting member is connected to the clamping block (2), and the clamping block (2) is used for being fixed relative to the base (1) by means of the limiting member.

Description

A two-stage chuck and machine tool with clamping and pulling down

[0001] Cross-reference to related applications

[0002] This disclosure claims priority to Chinese Patent Application No. 2024225722434, filed on October 23, 2024, entitled “A Two-Stage Clamping and Pull-Down Chuck,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of chuck-related structures for machine tools, and more specifically, to a clamping and pulling-down two-stage chuck and machine tool. Background Technology

[0004] With the continuous development of science and technology, the requirements for machining accuracy of mechanical parts are becoming increasingly stringent. In machining, in order to prevent workpiece displacement during the machining process and thus affect machining accuracy, most parts rely on clamping devices to accurately and reliably position and clamp them to ensure the machining accuracy of the parts.

[0005] In existing technologies, common chucks mainly achieve the clamping and releasing of parts through the radial movement of the jaws, and achieve pull-down through other structures; and the emergence of the pull-down function has improved the impact of jaw floating to a certain extent, thereby ensuring the accuracy of parts on the Z-axis and the reliability of clamping.

[0006] However, the existing structures used to pull down parts are quite complex, making installation, disassembly, and maintenance very inconvenient.

[0007] Public content

[0008] This disclosure provides a two-stage chuck and machine tool with clamping and pulling down, which alleviates the problems in the prior art, such as unstable accuracy and unstable clamping of short-step workpieces due to the complex structure of pulling down the parts, as well as the inconvenience of installation, disassembly and maintenance.

[0009] To achieve the above objectives, the embodiments of this disclosure adopt the following technical solutions:

[0010] In a first aspect, embodiments of this disclosure provide a clamping and pulling-down two-section chuck, including a chuck body and a plurality of clamping structures, wherein the plurality of clamping structures enclose a clamping space configured to clamp parts;

[0011] Each of the clamping structures includes a base, a clamping block, and a limiting member, wherein the base is connected to the disc body;

[0012] The clamping block has a contact surface configured to be slidably connected to the base, and the contact surface is an inclined surface or a conical surface. The clamping block is configured to be slidably connected to the base along the inclined direction of the contact surface.

[0013] The limiting member is connected to the clamping block, and the clamping block is configured to be fixed relative to the base by means of the limiting member.

[0014] Optionally, there is an angle between the contact surface and the bottom surface of the clamping block, and the angle is an acute angle.

[0015] Optionally, the clamping structure further includes a spring sheet disposed between the clamping block and the base, the spring sheet being configured to undergo elastic deformation when the clamping block clamps the part.

[0016] Optionally, the base is provided with a support portion, and the spring piece is provided between the support portion and the clamping block.

[0017] Optionally, one end of the clamping block is provided with a clamping portion configured to clamp the part, and the other end is provided with the limiting member, the limiting member including a limiting slider slidably connected to the base.

[0018] Optionally, a first limiting groove is provided on the side where the clamping block is slidably connected to the base, and a first limiting protrusion is provided on the base. The first limiting protrusion cooperates with the first limiting groove so that the clamping block is slidably connected to the base in the first limiting groove along the inclined direction of the contact surface.

[0019] Optionally, a second limiting groove is provided on the side of the base that is slidably connected to the clamping block, and the clamping block is provided with a second limiting protrusion. The second limiting protrusion cooperates with the second limiting groove so that the clamping block is slidably connected to the base in the second limiting groove along the inclined direction of the contact surface.

[0020] Optionally, the second limiting groove is U-shaped.

[0021] Optionally, the clamping structure further includes a connecting component, one end of which passes through the base and connects to the clamping block.

[0022] Optionally, the connecting assembly includes a connector and an elastic member, one end of the connector passes through the base and is connected to the clamping block, and the other end of the connector abuts against the base;

[0023] The elastic element is sleeved on the outside of the connector, with one end of the elastic element connected to the base and the other end connected to the clamping block.

[0024] Optionally, the base has a fixing hole, and the base is configured to be connected to the disk body after passing through the fixing hole via an external fixing member;

[0025] The base has a hole, and one end of the connector is inserted into the hole and passes through the base to connect with the clamping block;

[0026] The fixing hole is perpendicular to the hole.

[0027] Optionally, the spring includes a connecting portion and bent portions at both ends of the connecting portion, the connecting portion being supported at the bottom of the clamping block;

[0028] The bending portion is located at the top of the support portion.

[0029] Optionally, the limiting member includes a limiting connector that passes through the clamping block and connects to the base, and the limiting connector is configured to fix the clamping block relative to the base.

[0030] Optionally, the spring sheet includes an annular connecting portion and a bent portion circumferentially disposed along the outer wall of the connecting portion;

[0031] The annular connecting portion is sleeved on the outside of the limiting connector, and the connecting portion is supported on the bottom of the clamping block;

[0032] The bent portion abuts against the base.

[0033] This disclosure also provides a machine tool including a clamping and pulling-down two-stage chuck as described in any of the above embodiments.

[0034] The embodiments disclosed herein can achieve the following beneficial effects:

[0035] In a first aspect, embodiments of this disclosure provide a two-stage chuck that clamps and then pulls down, including a chuck body and multiple clamping structures. The multiple clamping structures enclose a clamping space configured to clamp parts. Each clamping structure includes a base, a clamping block, and a limiting member. The base is connected to the chuck body. The clamping block has a contact surface configured to slide with the base, and the contact surface is an inclined surface or a conical surface. The clamping block is configured to slide with the base along the inclined direction of the contact surface. The limiting member is connected to the clamping block, and the clamping block is configured to be fixed relative to the base by the limiting member.

[0036] Compared with the prior art, the present disclosure provides a clamping and pulling-down two-stage chuck, which has multiple clamping structures on the disc body to enclose a clamping space configured to clamp parts. Each clamping structure includes a base and a clamping block, and the base and clamping block are relatively movable and connected. The chuck slides along the base through an inclined contact surface, and then a limiting member is used to limit the range of movement, so as to change the size of the clamping space and achieve a stable clamping effect. The structure of the base and clamping block is relatively simple, thus avoiding inconvenience during installation, disassembly or maintenance.

[0037] In summary, the embodiments disclosed herein at least alleviate the problems existing in the prior art, such as unstable accuracy and unstable clamping of short-step workpieces due to the complex structure of the pull-down mechanism, as well as the technical problems of inconvenience in installation, disassembly and maintenance. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the specific embodiments of this disclosure or 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 disclosure. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0039] Figure 1 is a three-dimensional structural diagram of a clamping and pulling-down two-section chuck provided in an embodiment of this disclosure;

[0040] Figure 2 is a three-dimensional structural diagram of the clamping part of a two-section chuck that clamps and then pulls down according to an embodiment of the present disclosure;

[0041] Figure 3 is a top view of the clamping portion of a two-section chuck that clamps and pulls down according to an embodiment of the present disclosure.

[0042] Figure 4 is a schematic diagram of the AA cross-section structure of the clamping part in Figure 3 in the unclamped state;

[0043] Figure 5 is an enlarged schematic diagram of the structure of part B in Figure 4;

[0044] Figure 6 is a schematic diagram of the AA cross-section structure of the clamping part in Figure 3 in the clamping state;

[0045] Figure 7 is an enlarged schematic diagram of the C section structure in Figure 6;

[0046] Figure 8 is a schematic diagram of the three-dimensional structure of a clamping and pulling down two-section chuck provided in an embodiment of the present disclosure;

[0047] Figure 9 is a three-dimensional structural diagram of a clamping and pulling-down two-section chuck provided in an embodiment of this disclosure;

[0048] Figure 10 is a three-dimensional structural diagram of the clamping part of a clamping and pulling-down two-section chuck provided in an embodiment of the present disclosure;

[0049] Figure 11 is a top view of the clamping portion of a two-section chuck that clamps and pulls down according to an embodiment of the present disclosure.

[0050] Figure 12 is a schematic diagram of the DD cross-sectional structure of the clamping part in Figure 11 in the unclamped state;

[0051] Figure 13 is a schematic diagram of the three-dimensional structure of a clamping and pulling down two-section chuck provided in an embodiment of the present disclosure;

[0052] Figure 14 is a schematic cross-sectional view of a clamping and pulling-down two-section chuck provided in an embodiment of this disclosure;

[0053] Figure 15 is a three-dimensional structural diagram of a clamping and pulling-down two-section chuck provided in an embodiment of this disclosure;

[0054] Figure 16 is a top view of the clamping portion of a two-section chuck that clamps and pulls down according to an embodiment of the present disclosure.

[0055] Figure 17 is a three-dimensional structural diagram of a clamping and pulling-down two-section chuck provided in an embodiment of the present disclosure;

[0056] Figure 18 is a top view of the clamping portion of a two-section chuck that clamps and pulls down according to an embodiment of the present disclosure.

[0057] Figure 19 is a three-dimensional structural diagram of a clamping and pulling-down two-section chuck provided in an embodiment of this disclosure;

[0058] Figure 20 is a top view of the clamping portion of a two-section chuck that clamps and pulls down according to an embodiment of this disclosure.

[0059] Icons: 1-Base; 11-Support; 12-Fixing hole; 13-Hole; 14-First limiting protrusion; 15-Second limiting groove; 2-Clamping block; 21-Clamping part; 22-Limiting slider; 23-Contact surface; 24-First limiting groove; 25-Second limiting protrusion; 3-Disc body; 31-Guide slot; 32-Guide block; 4-Connecting component; 41-Connector; 42-Elastic component; 5-Spring; 51-Connecting part; 52-Bending part; 6-Limiting connector. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The components of the embodiments of this disclosure described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0061] Therefore, the following detailed description of the embodiments of this disclosure provided in the accompanying drawings is not intended to limit the scope of the claimed disclosure, but merely to illustrate selected embodiments of the disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0062] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0063] In the description of this disclosure, it should be noted that the terms "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this disclosure is in use. They are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0064] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they 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 can be slightly tilted.

[0065] In the description of this disclosure, it should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0066] The following detailed description of some embodiments of this disclosure is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0067] This embodiment provides a clamping and pulling-down two-stage chuck. Referring to Figure 1, the clamping and pulling-down two-stage chuck includes a chuck body 3 and multiple clamping structures. The multiple clamping structures enclose a clamping space for clamping parts. Each clamping structure includes a base 1, a clamping block 2, and a limiting member. The base 1 is connected to the chuck body 3. The clamping block 2 has a contact surface 23 for sliding connection with the base 1, and the contact surface 23 is an inclined surface. The clamping block 2 is used to slide in the inclined direction of the contact surface 23 with the base 1. The limiting member is connected to the clamping block 2, and the clamping block 2 is used to fix relative to the base 1 by the limiting member.

[0068] The embodiments disclosed herein at least alleviate the problems existing in the prior art, such as unstable accuracy and unstable clamping of short-step workpieces due to the complex structure of the pull-down mechanism, as well as the technical problems of inconvenience in installation, disassembly and maintenance.

[0069] In this embodiment, multiple clamping structures are provided on the disc body 3 at intervals along its axial direction, and a clamping space for clamping parts is formed by the multiple clamping structures. Each clamping structure includes a base 1 and a clamping block 2. The base 1 is used to connect with the disc body 3, and the clamping block 2 is connected with the base 1. In use, the base 1 and the clamping block 2 can be movably connected within a certain range. Specifically, they slide along the base 1 through the inclined contact surface 23, and the range of movement is adjusted by the limiting member to change the size of the clamping space, thereby achieving a stable clamping effect.

[0070] Compared with the prior art, the two-stage clamping and pulling-down chuck provided in this disclosure provides a clamping space for clamping parts by providing multiple clamping structures on the disc body 3. Each clamping structure includes a base 1 and a clamping block 2, and the base 1 and the clamping block 2 are relatively movable and connected. The inclined contact surface 23 slides along the base 1, and then the movement range is limited by a limiting member to achieve a stable clamping effect. The structure of the base 1 and the clamping block 2 is relatively simple, thereby avoiding inconvenience during installation, disassembly or maintenance.

[0071] In an optional embodiment of this example, referring 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 acute.

[0072] 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; in use, since the angle between the contact surface 23 and the bottom surface of the clamping block 2 is an acute angle, the clamping block 2 moves along the inclined direction of the contact surface 23 during the pull-down process, that is, the clamping block 2 moves obliquely upward relative to the base 1 to clamp the part during the pull-down process.

[0073] Optionally, referring to Figure 4 or Figure 5, the clamping structure further includes a spring piece 5, which is disposed between the clamping block 2 and the base 1. The spring piece 5 is used to undergo elastic deformation when the clamping block 2 clamps the part.

[0074] Specifically: the spring piece 5 is located between the clamping block 2 and the base 1. Preferably, the spring piece 5 is located 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, and 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 reset due to its own elasticity.

[0075] Optionally, referring to Figures 4 and 6, the base 1 is provided with a support part 11, and a spring piece 5 is provided between the support part 11 and the clamping block 2.

[0076] Specifically: the base 1 is provided with a support part 11, and the support part 11 protrudes from the base 1, while the bottom of the clamping block 2 is provided on the support part 11, and a spring piece 5 is provided between the support part 11 and the clamping block 2; referring to Figures 5 and 7, when in use, the clamping block 2 moves toward the support part 11 and presses the spring piece 5 to deform it.

[0077] Optionally, referring to Figure 2 or Figure 3, one end of the clamping block 2 is provided with a clamping part 21 for clamping the part, and the other end is provided with a limiting member, which includes a limiting slider 22 that is slidably connected to the base 1; the clamping structure also includes a connecting component 4, one end of which passes through the base 1 and is connected to the clamping block 2.

[0078] Specifically: One end of the clamping block 2 is provided with a clamping part 21, and the end opposite to the clamping part 21 is provided with a limiting member, which includes a limiting slider 22. Correspondingly, the base 1 is provided with a limiting groove. By sliding the limiting slider 22 in this limiting groove, the clamping block 2 can only move through the extension direction of the limiting groove. 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. Optionally, referring 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.

[0079] Specifically: one end of the connector 41 passes through the base 1 and is connected to the clamping block 2. Preferably, the connector 41 can be a screw, and the screw nut is connected to the base 1 for limiting. The elastic element 42 is located between the base 1 and the clamping block 2. The elastic element 42 is preferably a spring, and the spring is sleeved on the outside of the connector 41. The spring force pushes the clamping block 2 to move away from the base 1 when it is not in use.

[0080] Optionally, referring to Figure 4 or Figure 6, the base 1 has a fixing hole 12, and the base 1 is used to connect to the disc body 3 after passing through the fixing hole 12 with an external fastener; the base 1 has a hole 13, and one end of the connector 41 is inserted into the hole 13 and passes through the base 1 to connect with the clamping block 2; the fixing hole 12 is perpendicular to the hole 13.

[0081] Specifically: The base 1 has two fixing holes 12, both of which are set vertically to be connected to the disc 3 by external bolts or other components; while the base 1 has holes 13 in the horizontal direction, through which the two fixing holes can pass in sequence, so that the screw-shaped connector 41 can pass through and limit the screw nut.

[0082] In an optional embodiment of this invention, referring to FIG8, the spring piece 5 includes a connecting portion 51 and bent portions 52 at both ends of the connecting portion 51. The connecting portion 51 is supported on the bottom of the clamping block 2; the bent portions 52 are disposed on the top of the support portion 11.

[0083] Specifically: the connecting part 51 can be a rectangular ring-shaped mechanism, and both ends of it are provided with downward bending parts 52; preferably, the connecting part 51 and the bending parts 52 are integrally formed, and the bottom of the clamping block 2 is provided with a groove for fixing the connecting part 51; in use, the connecting part 51 and the bending parts 52 are deformed by pressing down the clamping block 2.

[0084] In an optional embodiment of this invention, referring to Figures 9, 10 or 11, the limiting member includes a limiting connector 6. The limiting connector 6 passes through the clamping block 2 and is connected to the base 1. The limiting connector 6 is used to fix the clamping block 2 relative to the base 1.

[0085] 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, while a spring piece 5 is provided between the clamping block 2 and the base 1; and bolts can be provided in the limiting connector 6 to fix the limiting connector 6 relative to the base 1.

[0086] Optionally, referring to Figure 12 or Figure 13, the spring piece 5 includes an annular connecting portion 51 and a bent portion 52 arranged circumferentially along the outer wall of the connecting portion 51; the annular connecting portion 51 is sleeved on the outside of the limiting connector 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.

[0087] Specifically: the spring piece 5 includes an annular connecting part 51 and a bent part 52 arranged circumferentially along the outer wall of the connecting part 51; the annular connecting part 51 is sleeved on the outside of the limiting connector 6, and the upper surface of the connecting part 51 is supported and abutted against the bottom surface of the protrusion of the clamping block 2, and the bent part 52 is connected to the connecting part 51 circumferentially and bent downward, while the bottom of the bent part 52 abuts against the base 1.

[0088] In an optional embodiment of this invention, referring to FIG9, the disk 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.

[0089] Specifically: the disc body 3 is provided with multiple guide slots 31, and the multiple guide slots 31 are distributed at intervals along the circumference of the disc body 3. Each guide slot 31 is provided with a guide block 32. The guide block 32 slides into the guide slot 31 along the extension direction and is connected by an external screw to fix the guide block 32 to the disc body 3.

[0090] In an optional embodiment of this example, referring to FIG14, the thickness of the protrusion of the clamping block 2 is increased so that the top of the protrusion of the clamping block 2 abuts against the bottom of the limiting connector 6 without the spring piece 5, and the bottom of the protrusion of the clamping block 2 abuts against the top of the support portion 11 of the base 1.

[0091] In an optional embodiment of this example, referring to FIG15, the clamping block 2 is connected to the base 1, and the clamping part 21 of the clamping block 2 is oriented away from the disk body 3, so that when clamping a larger workpiece, the clamping action from the outside to the inside can be changed to the inward support action from the inside to the outside.

[0092] In an optional embodiment of this example, referring to FIG16, 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.

[0093] In an optional embodiment of this invention, referring to Figures 17 and 18, a first limiting groove 24 is provided on the side where the clamping block 2 is slidably connected to the base 1. The base 1 is provided with a first limiting protrusion 14. The first limiting protrusion 14 cooperates with the first limiting groove 24 so that the clamping block 2 is slidably connected to the base 1 within the first limiting groove 24 along the inclined direction of the contact surface 23. By providing the first limiting groove 24 and the first limiting protrusion 14, the base 1 and the clamping block 2 can be prevented from displacing in any direction other than along the sliding direction during relative sliding. Specifically, in this embodiment, the clamping block 2 has an "L"-shaped structure protruding at both ends of the contact surface 13. The "L"-shaped structure includes a connecting part and a limiting part. The connecting part is connected to the clamping block, and the limiting part is connected to the connecting part. The limiting part is spaced apart from the contact surface 23 and is parallel to the contact surface 23. The limiting part, the connecting part, and the contact surface 23 together form the first limiting groove 24. The first limiting protrusion 14 of the base 1 is engaged in the limiting groove 24.

[0094] Referring to Figures 19 and 20, in an optional embodiment of this invention, a second limiting groove 15 is provided on the side where the base 1 and the clamping block 2 are slidably connected. The clamping block 2 is provided with a second limiting protrusion 25, which cooperates with the second limiting groove 15 to allow the clamping block 2 to slide within the second limiting groove 15 along the inclined direction of the contact surface 23 and the base 1. In this embodiment, the second limiting groove 15 is U-shaped. Of course, the shape of the second limiting groove 15 can also be other shapes with limiting function, which are not limited here. This embodiment of the present disclosure also provides a machine tool, including a bed and the aforementioned clamping and pulling-down two-section chuck, with the chuck body 3 connected to the bed. The machine tool can also be provided with other structures according to its function, which are not limited here.

[0095] Finally, it should be noted that the various embodiments in this specification can also be used for ball joint type powered chucks; the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other; the above embodiments in this specification are only used to illustrate the technical solutions of this disclosure, and not to limit it; although this disclosure 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; and these 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 disclosure. Industrial applicability

[0096] In summary, the present disclosure provides a two-stage chuck and machine tool with clamping and pulling down, which can alleviate the problems in the prior art, such as unstable accuracy and unstable clamping of short-step workpieces due to the complex structure of pulling down the parts, as well as the technical problems of inconvenience in installation, disassembly and maintenance.

Claims

1. A two-stage chuck that clamps and then pulls down, characterized in that, It includes a disc body (3) and multiple clamping structures, the multiple clamping structures enclosing a clamping space configured to clamp parts; Each of the clamping structures includes a base (1), a clamping block (2), and a limiting member, wherein the base (1) is connected to the disc body (3); The clamping block (2) is provided with a contact surface (23) configured to be slidably connected to the base (1), and the contact surface (23) is an inclined surface or a conical surface. The clamping block (2) is configured to be slidably connected to 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 configured to be fixed relative to the base (1) by means of the limiting member.

2. The two-stage chuck with clamping and pulling down 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).

3. The clamping and pulling-down two-stage chuck according to claim 2, characterized in that, The included angle is an acute angle.

4. A two-stage clamping and pulling-down chuck according to any one of claims 1-3, characterized in that, The clamping structure further includes a spring sheet (5), which is disposed between the clamping block (2) and the base (1). The spring sheet (5) is configured to undergo elastic deformation when the clamping block (2) clamps the part, and to reset the clamping block (2).

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

6. A two-stage chuck with clamping and pulling down according to any one of claims 1-5, characterized in that, One end of the clamping block (2) is provided with a clamping part (21) configured to clamp the part, and the other end is provided with the limiting member, which includes a limiting slider (22) slidably connected to the base (1).

7. A two-stage clamping and pulling-down chuck according to any one of claims 1-5, characterized in that, The clamping block (2) is provided with a first limiting groove (24) on one side that is slidably connected to the base (1). The base (1) is provided with a first limiting protrusion (14). The first limiting protrusion (14) cooperates with the first limiting groove (24) so ​​that the clamping block (2) is slidably connected to the base (1) in the first limiting groove (24) along the inclined direction of the contact surface (23).

8. A two-stage clamping and pulling-down chuck according to any one of claims 1-5, characterized in that, A second limiting groove (15) is provided on one side of the base (1) that is slidably connected to the clamping block (2). The clamping block (2) is provided with a second limiting protrusion (25). The second limiting protrusion (25) cooperates with the second limiting groove (15) so that the clamping block (2) is slidably connected to the base (1) in the second limiting groove (15) along the inclined direction of the contact surface (23).

9. A two-stage chuck for clamping and pulling down according to claim 8, characterized in that, The second limiting groove (15) is U-shaped.

10. A two-stage clamping and pulling-down chuck according to any one of claims 1-9, characterized in that, The clamping structure also includes a connecting component (4), one end of which passes through the base (1) and is connected to the clamping block (2).

11. A two-stage chuck for clamping and pulling down according to claim 10, characterized in that, The connecting component (4) includes a connector (41) and an elastic member (42). One end of the connector (41) passes through the base (1) and is connected to the clamp (2), and the other end of the connector (41) abuts against the base (1). The elastic element (42) is sleeved on the outside of the connector (41), and one end of the elastic element (42) is connected to the base (1), and the other end is connected to the clamp (2).

12. A two-stage chuck for clamping and pulling down according to claim 11, characterized in that, The base (1) has a fixing hole (12), and the base (1) is configured to be connected to the disk body (3) after passing through the fixing hole (12) by an external fixing member; The base (1) has a hole (13), and one end of the connector (41) is inserted into the hole (13) and passes through the base (1) to connect with the clamp (2); The fixing hole (12) is perpendicular to the hole (13).

13. A two-stage clamping and pulling-down chuck according to any one of claims 5-12, characterized in that, The spring piece (5) includes a connecting part (51) and bent parts (52) at both ends of the connecting part (51), the connecting part (51) being supported at the bottom of the clamping block (2); The bending portion (52) is disposed on the top of the support portion (11).

14. A two-stage clamping and pulling-down chuck according to any one of claims 1-13, characterized in that, The limiting member includes a limiting connector (6), which passes through the clamp (2) and connects to the base (1), and the limiting connector (6) is configured to fix the clamp (2) relative to the base (1).

15. A two-stage clamping and pulling-down chuck according to any one of claims 4-14, characterized in that, The spring piece (5) includes an annular connecting portion (51) and a bent portion (52) arranged circumferentially along the outer wall of the connecting portion (51); The annular connecting part (51) is sleeved on the outside of the limiting connector (6), and the connecting part (51) is supported on the bottom of the clamp (2); The bent portion (52) abuts against the base (1).

16. A machine tool, characterized in that, Includes the clamping and pulling-down two-stage chuck as described in any one of claims 1-15.

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