Turning clamp for thin-wall sheet metal part with inclined end face

Abstract

The turning clamp for the inclined-end-face thin-wall sheet metal part is suitable for fastening and clamping the sheet metal part, the sheet metal part is an eccentric variable-cross-section thin-wall barrel and comprises a first fastening assembly, a second fastening assembly and a connecting rod, the first fastening assembly is connected with the second fastening assembly through the connecting rod, the first fastening assembly is connected with the second fastening assembly through the connecting rod, and the second fastening assembly is connected with the second fastening assembly through the connecting rod. The first fastening assembly is used for fastening the top face of the sheet metal part, the second fastening assembly is used for fastening the bottom face of the sheet metal part, and the machining efficiency of the sheet metal part is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of special-shaped part clamp, especially to a lathe clamp for oblique end face thin wall sheet metal part. BACKGROUND

[0002] Sheet metal part is mainly applied to the field of sheet welding machine casket of aero-engine, it is eccentric variable cross section sheet metal cylinder, main material is titanium alloy, the difficulty of part in lathe processing is that, there is no reference in part angular direction, it is difficult to align, the wall thickness is thin, and the large and small ends are eccentric when lathe processing, generally lathe processing needs twice clamping, and the repeated positioning precision is poor, the prior art device adopts complicated structure to clamp, and the cost is high and the lathe processing is prone to vibration, so that the processing efficiency of sheet metal part is reduced. UTILITY MODEL CONTENT

[0003] Therefore, the utility model provides a lathe clamp for oblique end face thin wall sheet metal part, solves the technical problem that the prior art clamp device causes low processing efficiency of sheet metal part.

[0004] A lathe clamp for oblique end face thin wall sheet metal part is suitable for fastening and clamping of sheet metal part, the sheet metal part is eccentric variable cross section thin wall cylinder, and the lathe clamp comprises a first fastening assembly, a second fastening assembly and a connecting rod, the first fastening assembly is connected with the second fastening assembly through the connecting rod, wherein,

[0005] The first fastening assembly is used for fastening the top surface of the sheet metal part.

[0006] The second fastening assembly is used for fastening the bottom surface of the sheet metal part.

[0007] Preferably or optionally, the lathe clamp further comprises an alignment assembly, the alignment assembly is used for initial positioning and alignment of the sheet metal part, and assists installation of the first fastening assembly, the second fastening assembly and the connecting rod on the sheet metal part, the alignment assembly comprises a first arc-shaped part and a second arc-shaped part in a hollow structure, the first arc-shaped part and the second arc-shaped part form an arc-shaped cavity when abutting, the shape of the arc-shaped cavity is adapted to the outer contour of the sheet metal part, or the alignment assembly comprises a first arc-shaped plate and a second arc-shaped plate, the first arc-shaped plate and the second arc-shaped plate are attached to the outer circumferential surface of the sheet metal part along the radial direction of the sheet metal part and are used for assisting alignment.

[0008] Preferably or optionally, the first fastening assembly comprises a first support plate, a first mounting plate, a first movable plate, and a first expansion block arranged in a conical structure, the first movable plate is provided with a first bolt at the central region of the top surface, the length of the first bolt is greater than the sum of the thicknesses of the first support plate and the first mounting plate, the diameter of the first movable plate is greater than that of the first support plate and extends above the first support plate, the central region of the first support plate is provided with a hole, and a first cross rod is mounted in the hole, the central region of the first cross rod is provided with a first mounting hole, and the bottom surface of the first mounting hole is provided with the first mounting plate, wherein,

[0009] The first movable plate is assembled by a plurality of first movable pieces in a contact manner, the first movable piece comprises a first arc-shaped part and a first rod, one end of the first arc-shaped part towards the center of the first movable plate is integrally arranged with one end of the first rod, and the other end of the first rod is provided with a first arc-shaped gap, and the shapes of all the first arc-shaped gaps are adapted to the circumferential shape of the first expansion block.

[0010] A first through slot is formed in the first movable piece, and a first spring is arranged at one end of the first through slot; a first limiting block is fixedly arranged on the top surface of the first cross rod at a corresponding position, the shape of the first limiting block is adapted to the shape of the first through slot, and one side of the first limiting block is fixedly connected with the free end of the first spring.

[0011] The first expansion block is mounted on the first bolt in a threaded manner, and rotating the first expansion block can move along the first bolt in the axial direction.

[0012] One end of the connecting rod is detachably mounted on the first support plate and is staggered with the first movable piece, and the other end is fixedly connected with the second fastening assembly.

[0013] In the initial state, the first spring is not compressed or stretched, when the first expansion block is rotated, the first expansion block moves downward along the first bolt and generates a pushing force on all the first movable pieces, which pushes the first movable pieces to move away from the center of the first movable plate (and the first movable plate moves radially), and under the auxiliary action of the alignment assembly, the arc-shaped outer contour of each first arc-shaped part is in close contact with and flush with the inner wall surface of the opening of the top surface of the sheet metal part, thereby fixing the top of the sheet metal part.

[0014] Preferably or optionally, both ends of the first expansion block are circular sections, and the cross-sectional size of the large end of the first expansion block is greater than the cross-sectional size of the first mounting hole, and the cross-sectional size of the small end of the first expansion block is less than or equal to the cross-sectional size of the first mounting hole.

[0015] Preferably or optionally, the first spring is installed in the first through slot along the center line direction of the first rod; and the cross-sectional size of the first support plate is smaller than the cross-sectional size of the opening position of the top surface of the sheet metal part.

[0016] Preferably or optionally, the second fastening assembly comprises a second support plate, a second mounting plate, a second movable plate and a second expansion block arranged in a conical structure, a second bolt is installed on the top surface of the central region of the second movable plate, the length of the second bolt is greater than the sum of the thicknesses of the second support plate and the second mounting plate, the diameter of the second movable plate is greater than the diameter of the second support plate and extends above the second support plate, a hole is formed in the central region of the second support plate, and a second cross rod is installed in the hole, a second mounting hole is formed in the central region of the second cross rod, and the bottom surface of the second mounting hole is installed with the second mounting plate, wherein,

[0017] The second movable plate is composed of a plurality of second movable pieces in a contact manner, the second movable piece comprises a second arc-shaped part and a second rod, one end of the second arc-shaped part towards the center of the second movable plate is integrally arranged with one end of the second rod, and the other end of the second rod is provided with a second arc-shaped gap, and the shapes of all the second arc-shaped gaps are matched with the circumferential shape of the second expansion block;

[0018] A second through slot is formed in the second movable piece, and a second spring is arranged at one end of the second through slot; a second limiting block is fixedly installed on the top surface of the second cross rod at a corresponding position, the shape of the second limiting block is matched with the shape of the second through slot, and one side of the second limiting block is fixedly connected with the free end of the second spring;

[0019] The second expansion block is installed on the second bolt in a threaded manner, and rotating the second expansion block can move along the axial direction of the second bolt;

[0020] One end of the connecting rod is detachably installed on the second support plate and is staggered with the second movable piece;

[0021] In the initial state, the second spring is not compressed or stretched, when the second expansion block is rotated, the second expansion block moves downward along the second bolt and generates a pushing force on all the second movable pieces, pushing the second movable pieces to move away from the center of the second movable plate (and the second movable plate moves radially), and under the auxiliary action of the alignment assembly, the arc-shaped outer contour of each second arc-shaped part is in close contact with and flush with the inner wall surface of the opening of the bottom surface of the sheet metal part, thereby fixing the bottom of the sheet metal part.

[0022] Preferably or optionally, the second expansion block has a circular cross section at both ends, and the cross section size of the large end of the second expansion block is larger than the cross section size of the second mounting hole, and the cross section size of the small end of the second expansion block is smaller than or equal to the cross section size of the second mounting hole.

[0023] Preferably or optionally, the base further comprises a top surface provided in a slope structure, and the inclination angle is the same as that of the second support plate.

[0024] Advantages

[0025] The first fastening assembly, the second fastening assembly and the connecting rod clamp the sheet metal part, thereby improving the processing efficiency of the sheet metal part by the numerical control machine tool. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Figure 1 A perspective view of the setting alignment assembly;

[0028] Figure 2 A perspective view of the overall structure;

[0029] Figure 3 A front view of Figure 1 A front view of

[0030] Figure 4 A front view of Figure 2 A front view of

[0031] Figure 5 A top view of the first support plate;

[0032] Figure 6 A top view of the first movable plate;

[0033] Figure 7 A top view of the first movable plate in an initial state;

[0034] Figure 8 A top view of the first movable plate after being pressed;

[0035] Figure 9 A top view of the second support plate;

[0036] Figure 10 A top view of the second movable plate after being pressed, wherein:

[0037] 1, sheet metal part; 2, connecting rod; 31, first arc-shaped part; 32, second arc-shaped part; 4, base; 51, first support plate; 511, first cross rod; 512, first mounting hole; 513, first limiting block; 52, first mounting plate; 521, first bolt; 53, first expansion block; 54, first movable part; 541, first arc-shaped part; 542, first rod; 543, first through slot; 544, first notch; 545, first spring; 61, second support plate; 611, second cross rod; 612, second mounting hole; 613, second limiting block; 62, second mounting plate; 621, second bolt; 63, second expansion block; 64, second movable part; 641, second arc-shaped part; 642, second rod; 643, second through slot; 644, second notch; 645, second spring. DETAILED DESCRIPTION

[0038] The embodiments of the present disclosure will be described in detail below with reference to the drawings.

[0039] The embodiments of the present disclosure will be described in detail below with reference to the drawings.

[0040] It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It is to be understood that the terms "approximately" and "substantially" are used herein to represent values that are close to, but not necessarily exactly, the stated value. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used in the description is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. It is also possible in the present disclosure that steps can be executed in different sequence, where this is explicitly indicated, or is apparent from this description, in combination with the figures and / or in combination with the attached claims. It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not intended to be restrictive of the disclosure. The accompanying drawings are incorporated in and constitute a part of this specification, illustrate various embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0041] It is also need to be explained that the figures provided in the following embodiments only illustrate the basic concept of the present disclosure in a schematic way, and only the components related to the present disclosure are shown in the figures, not the number, shape and size of the components when actually implemented, and the shape, number and proportion of each component when actually implemented can be a random change, and the component layout pattern can also be more complex.

[0042] In addition, in the following description, specific details are provided in order to facilitate a thorough understanding of the examples. However, one skilled in the art will understand that aspects can be practiced without these specific details.

[0043] Referring to Figures 1 to 10 The shown inclined end face thin wall sheet metal part turning fixture is suitable for fastening and clamping of the sheet metal part 1, the sheet metal part 1 is an eccentric variable cross-section thin wall cylinder, including a first fastening assembly, a second fastening assembly and a connecting rod 2, the first fastening assembly is connected with the second fastening assembly through the connecting rod 2, wherein,

[0044] The first fastening assembly is used for fastening the top surface of the sheet metal part 1, and the second fastening assembly is used for fastening the bottom surface of the sheet metal part 1. The upper and lower processed end faces of the sheet metal part 1 are respectively expanded by the first fastening assembly and the second fastening assembly, and no vibration occurs during end face turning.

[0045] As the specific implementation provided in the present case, since each end face of the sheet metal part 1 is not flush, or at least one of the top surface and the bottom surface is not flush, initial positioning and alignment are required. It also includes an alignment assembly for initial positioning and alignment of the sheet metal part 1, which assists the installation of the first fastening assembly, the second fastening assembly and the connecting rod 2 on the sheet metal part 1. The alignment assembly includes a first arc-shaped part 31 and a second arc-shaped part 32 arranged in a hollow structure, and the first arc-shaped part 31 and the second arc-shaped part 32 form an arc-shaped cavity when they are connected. The shape of the arc-shaped cavity is adapted to the outer contour of the sheet metal part 1. When the first arc-shaped part 31 and the second arc-shaped part 31 initially position the sheet metal part 1, the installation of the first fastening assembly and the second fastening assembly is aligned, respectively, to ensure that the first fastening assembly and the second fastening assembly are flush with the inner wall surface of the sheet metal part 1, that is, the highest point and the lowest point of the part are aligned using the profile template, the angular position of the part is aligned, or the alignment assembly includes a traditional first arc-shaped plate and a second arc-shaped plate. The first arc-shaped plate and the second arc-shaped plate are attached to the outer peripheral surface of the sheet metal part along the radial direction of the sheet metal part, which is used to assist in alignment, or other arc-shaped alignment assemblies are used.

[0046] As the specific embodiments provided in the present case, the first fastening assembly comprises a first support plate 51, a first mounting plate 52, a first movable plate and a first expansion block 53 arranged in a conical structure. The first mounting plate 52 is provided with a first bolt 521 at the central area of the top surface. The length of the first bolt 521 is greater than the sum of the thicknesses of the first support plate 51 and the first mounting plate 52. The first movable plate has a diameter greater than that of the first support plate 51 and is arranged above the first support plate 51. The first support plate 51 is provided with a first cross rod 511 at the central area. The first cross rod 511 is provided with a first mounting hole 512 at the central area. The bottom surface of the first mounting hole 512 is provided with the first mounting plate 52. Wherein,

[0047] The first movable plate is composed of a plurality of first movable pieces 54 in a contact manner. The first movable piece 54 comprises a first arc-shaped part 541 and a first rod 542. One end of the first arc-shaped part 541 is integrally arranged with one end of the first rod 542 towards the center of the first movable plate. The other end of the first rod 542 is provided with a first arc-shaped gap. The shape surrounded by all the first arc-shaped gaps is adapted to the circumferential shape of the first expansion block 53.

[0048] The first movable piece 54 is provided with a first through groove 543. One end of the first through groove 543 is provided with a first spring 545. The top surface of the first cross rod 511 is fixedly provided with a first limiting block 513 at the corresponding position. The shape of the first limiting block 513 is adapted to the shape of the first through groove 543. One side of the first limiting block 513 is fixedly connected with the free end of the first spring 545. Preferably, the distance between the first limiting block 513 and the center of the first movable plate is greater than the distance between the first spring 545 and the center of the first movable plate. The first limiting block 513 is fixedly arranged on the branch rod corresponding to the top surface of the first cross rod 511.

[0049] The first expansion block 53 is threadedly arranged on the first bolt 521. The first expansion block 53 can be axially moved along the first bolt 521 by rotating the first expansion block 53. Preferably, one end of the first bolt 521 is provided with a limiting nut. The first expansion block 53 is separated from the first bolt 521. Preferably, the first expansion block 53 is provided with a threaded hole at the central area. The first expansion block 53 is threadedly arranged on the first bolt 521.

[0050] One end of the connecting rod 2 is detachably arranged on the first support plate 51 and is staggered with the first movable piece 54, so as not to interfere with the movement of the first movable piece 54. The other end is fixedly connected with the second fastening assembly.

[0051] In the initial state, the first spring 545 is not compressed or stretched, when the first expansion block 53 is rotated, the first expansion block 53 moves downward along the first bolt 521, and exerts a pushing force on all the first movable pieces 54, pushing the first movable pieces 54 to move away from the center of the first movable plate, that is, moving radially along the first movable plate, and under the auxiliary action of the alignment assembly, the arc-shaped outer contour of each first arc-shaped part 541 is in close contact with and flush with the inner wall surface of the top surface opening of the sheet metal part 1, thereby fixing the top of the sheet metal part 1, for example, the number of first movable pieces 54 is 4, each rod of the first cross rod 511 supports a first movable piece 54, the cross-sectional shape of the first notch 544 is one-fourth of the cross-sectional area of the small end of the first expansion block 53, that is, the cross-sectional area of the cavity formed by splicing the four first notches 544 is equal to or greater than the cross-sectional area of the small end of the first expansion block 53, when the first expansion block 53 moves downward, the pushing force is transmitted through the first notch 544, and under the action of the first spring 545, the first movable piece 54 moves linearly, so that the outer end surface or annular surface of each first arc-shaped part 541 is in close contact with the inner wall of the top surface of the sheet metal part 1, to provide clamping force, and ensure that the sheet metal part 1 does not vibrate during machining, and ensure the yield of the parts.

[0052] Preferably, both ends of the first expansion block 53 are circular in cross-section, the cross-sectional dimension of the large end of the first expansion block 53 is greater than the cross-sectional dimension of the first mounting hole 512, and the cross-sectional dimension of the small end of the first expansion block 53 is less than or equal to the cross-sectional dimension of the first mounting hole 512, the first spring 545 is installed in the first through groove 543 along the center line direction of the first rod 542, and the cross-sectional dimension of the first support plate 51 is less than the cross-sectional dimension of the top surface opening position of the sheet metal part 1.

[0053] As a specific embodiment provided in the present case, generally, the size of the bottom surface of the sheet metal part is greater than the size of the top surface, that is, the size of each component, that is, the hole, of the second fastening assembly is greater than the size of each component and hole of the first fastening assembly. The second fastening assembly comprises a second support plate 61, a second mounting plate 62, a second movable plate, and a second expansion block 63 arranged in a conical structure, the second mounting plate 62 is provided with a second bolt 621 in the central region of the top surface, the length of the second bolt 621 is greater than the sum of the thicknesses of the second support plate 61 and the second mounting plate 62, the diameter of the second movable plate is greater than the diameter of the second support plate 61 and extends above the second support plate 61, the second support plate 61 is provided with a second cross rod 611 in the central region of the opening, and the second cross rod 611 is provided with a second mounting hole 612 in the central region, the bottom surface of the second mounting hole 612 is provided with the second mounting plate 62, wherein,

[0054] The second movable plate is assembled by a plurality of second movable pieces 64 in a contact manner, the second movable piece 64 comprises a second arc-shaped part 641 and a second rod piece 642, one end of the second arc-shaped part 641 towards the center of the second movable plate is integrally arranged with one end of the second rod piece 642, the other end of the second rod piece 642 is provided with a second arc-shaped gap, and the shape surrounded by all the second arc-shaped gaps is matched with the circumferential shape of the second expansion block 63;

[0055] A second through groove 643 is arranged on the second movable piece 64, and one end in the second through groove 643 is provided with a second spring; the top surface of the second cross rod 611 is fixedly installed with a second limiting block 613 at a corresponding position, the shape of the second limiting block 613 is matched with the shape of the second through groove 643, and one side of the second limiting block 613 is fixedly connected with the free end of the second spring;

[0056] The second expansion block 63 is installed on the second bolt 621 in a threaded manner, and rotating the second expansion block 63 can move along the second bolt 621 in an axial direction;

[0057] One end of the connecting rod 2 is detachably installed on the second support plate 61 and is staggered with the second movable piece 64;

[0058] In the initial state, the second spring is not extruded or stretched, when the second expansion block 63 is rotated, the second expansion block 63 moves downward along the second bolt 621 and generates a pushing force on all the second movable pieces 64, pushing the second movable pieces 64 to move in a direction away from the center of the second movable plate, that is, the second movable plate moves in a radial direction, and under the auxiliary action of the alignment assembly, the arc-shaped outer contour of each second arc-shaped part 641 is in close contact with and flush with the inner wall surface of the opening on the bottom surface of the sheet metal part 1, thereby fixing the bottom of the sheet metal part 1. The number of second movable pieces 64 is the same as that of first movable pieces 54, which can tightly clamp the bottom surface of the sheet metal part 1, and the principle is the same as that of the first movable piece 54, which will not be described again.

[0059] Preferably, both ends of the second expansion block 63 are circular sections, the cross-sectional size of the large end of the second expansion block 63 is larger than the cross-sectional size of the second mounting hole 612, the cross-sectional size of the small end of the second expansion block 63 is smaller than or equal to the cross-sectional size of the second mounting hole 612, and the second spring is installed in the second through groove 643 along the center line direction of the second rod piece 642; the cross-sectional size of the second support plate 61 is smaller than the cross-sectional size of the opening position on the top surface of the sheet metal part 1.

[0060] As the specific embodiment provided in the case, the base 4 is also included, the top surface of the base 4 is arranged in an inclined surface structure, and the inclination angle is the same as that of the second support plate 61. The base 4 can be made according to the corresponding model of the sheet metal part 1, and overall, once clamped, by replacing the inclined base 4, the upper and lower end surface machining is realized, and the machining precision is high once clamped.

[0061] The above merely provides the specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present disclosure, which should be covered in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A lathe fixture for a thin-walled sheet metal part with an inclined end face, suitable for fastening and clamping the sheet metal part, the sheet metal part being a thin-walled cylinder with an eccentric variable cross-section, characterized in that, The utility model relates to a kind of fastening assembly for sheet metal, including first fastening component, second fastening component and connecting rod, the first fastening component is connected with the second fastening component by connecting rod, wherein, The first fastening component is used for the fastening of the top surface of the sheet metal piece; The second fastening component is used for the fastening of the bottom surface of the sheet metal piece.

2. The vehicle clamp of claim 1, wherein, It also includes alignment component, which is used for the initial positioning of sheet metal piece and its alignment, auxiliary first fastening component, second fastening component and connecting rod installation on sheet metal piece, the alignment component includes first arc piece and second arc piece arranged in hollow structure, the first arc piece and second arc piece form arc cavity when butting, the shape of the arc cavity is adapted to the outer contour of the sheet metal piece, or the alignment component includes first arc plate and second arc plate, the first arc plate and second arc plate are attached to the outer circumferential surface of sheet metal piece along the radial direction of sheet metal piece, for auxiliary alignment.

3. The vehicle clamp of claim 1, wherein, The first fastening component includes first support plate, first mounting plate, first movable plate and first expansion block arranged in conical structure, first mounting plate top surface central region is equipped with first bolt, the length of the first bolt is greater than the sum of the thickness of first support plate and first mounting plate, the diameter of the first movable plate is greater than the diameter of the first support plate and is above the first support plate, the first support plate central region is opened, and first cross rod is installed in hole, first mounting hole is arranged in the central region of the first cross rod, and the bottom surface of first mounting hole is equipped with the first mounting plate, wherein, The first movable plate is spliced by a plurality of first movable pieces in contact mode, the first movable piece includes first arc part and first rod, one end of the first arc part towards the center of the first movable plate is integrally arranged with one end of the first rod, the other end of the first rod is provided with first arc gap, and the shape surrounded by all the first arc gaps is adapted to the circumferential shape of the first expansion block; First spring is arranged in one end of first through slot in the first movable piece;First limit block is fixedly installed on the top surface of the first cross rod at the corresponding position, the shape of the first limit block is adapted to the shape of the first through slot, and one side of the first limit block is fixedly connected with the free end of the first spring; The first expansion block is installed on the first bolt in threaded mode, and rotating the first expansion block can move along the first bolt in axial direction; One end of the connecting rod is detachably installed on the first support plate, and is staggered with the first movable piece, and the other end is fixedly connected with the second fastening component; In initial state, the first spring is not extruded or stretched, when the first expansion block is rotated, the first expansion block moves downward along the first bolt, and generates thrust on all the first movable pieces, pushes the first movable pieces to move away from the center of the first movable plate, and under the auxiliary action of alignment component, the arc outer contour of each first arc part is in close contact with the inner wall surface of the opening of the top surface of the sheet metal piece and is flush.

4. The vehicle clamp of claim 3, wherein, Both ends of the first expansion block are circular sections, and the cross-sectional size of the large end of the first expansion block is larger than the cross-sectional size of the first mounting hole, and the cross-sectional size of the small end of the first expansion block is smaller than or equal to the cross-sectional size of the first mounting hole.

5. The vehicle clamp of claim 4, wherein, The first spring is installed in the first through slot along the center line direction of the first rod; and the cross-sectional size of the first support plate is smaller than the cross-sectional size of the opening position on the top surface of the sheet metal part.

6. The vehicle clamp of claim 3, wherein, The second fastening assembly comprises a second support plate, a second mounting plate, a second movable plate and a second expansion block arranged in a conical structure, the second mounting plate is provided with a second bolt at the central region of the top surface, the length of the second bolt is greater than the sum of the thicknesses of the second support plate and the second mounting plate, the diameter of the second movable plate is greater than the diameter of the second support plate and extends above the second support plate, the central region of the second support plate is provided with a second through hole, and a second cross rod is installed in the second through hole, the central region of the second cross rod is provided with a second mounting hole, and the bottom surface of the second mounting hole is provided with the second mounting plate, wherein, The second movable plate is composed of a plurality of second movable pieces in a contact mode, the second movable piece comprises a second arc-shaped part and a second rod, one end of the second arc-shaped part towards the center of the second movable plate is integrally arranged with one end of the second rod, and the other end of the second rod is provided with a second arc-shaped gap, and the shapes of all the second arc-shaped gaps are matched with the circumferential shape of the second expansion block; The second cross rod is provided with a second limiting block fixedly installed at the corresponding position on the top surface, the shape of the second limiting block is matched with the shape of the second through slot, and one side of the second limiting block is fixedly connected with the free end of the second spring; The second expansion block is installed on the second bolt in a threaded mode, and rotation of the second expansion block can move along the second bolt in the axial direction; One end of the connecting rod is detachably installed on the second support plate and is staggered with the second movable piece. In the initial state, the second spring is not extruded or stretched, when the second expansion block is rotated, the second expansion block moves downward along the second bolt and generates a pushing force on all the second movable pieces, the second movable pieces are pushed to move away from the center of the second movable plate, and under the auxiliary action of the alignment assembly, the arc-shaped outer contour of each second arc-shaped part is in close contact with and flush with the inner wall surface of the opening on the bottom surface of the sheet metal part.

7. The vehicle clamp of claim 6, wherein, Both ends of the second expansion block are circular sections, and the cross-sectional size of the large end of the second expansion block is larger than the cross-sectional size of the second mounting hole, and the cross-sectional size of the small end of the second expansion block is smaller than or equal to the cross-sectional size of the second mounting hole.

8. The vehicle clamp of claim 7, wherein, The second spring is installed in the second through slot along the center line direction of the second rod; and the cross-sectional size of the second support plate is smaller than the cross-sectional size of the opening position on the top surface of the sheet metal part.

9. The vehicle clamp of claim 8, wherein, The top surface of the base is provided with an inclined surface structure, and the inclination angle is the same as that of the second support plate.

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