Adjustable clamp

Abstract

The utility model discloses an adjustable clamp which comprises a base, at least three fixing blocks are evenly distributed on the base in the circumferential direction, the rear ends of the fixing blocks abut against the inner wall of an annular workpiece, installation grooves corresponding to the fixing blocks one to one are formed in the base in the circumferential direction, and the fixing blocks are located in the installation grooves. First threaded holes which are communicated with each other are formed in the fixing block and the base, and the two first threaded holes are connected through a first fastener, so that the fixing block is mounted in the mounting groove, and the position of the fixing block can be adjusted in the radial direction of the base; the base is further provided with a second threaded hole, a second fastener is arranged in the second threaded hole, and the top end of the second fastener abuts against the surface of the fixing block to pre-tighten the fixing block. The device is simple and stable in structure and convenient to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of tooling fixtures, in particular to an adjustable fixture. Background Art

[0002] When some annular workpieces need to be processed in the mold industry, the tooling and fixture used to position the annular workpiece is usually a base placed inside the annular workpiece, and positioning blocks are arranged circumferentially on the base, that is, multiple positioning blocks simultaneously support the annular workpiece to form a clamp, forming a three-jaw disc clamp. In the existing technology, the positioning blocks are radially moved by using structures such as screw rods, vortex guides, bolt pushers, and connecting rods to achieve radial limit adjustment. However, these structures are not only complex, but also have poor stability and are easily offset, which can easily cause processing accidents due to unstable clamping. Utility Model Content

[0003] The purpose of the utility model is to provide an adjustable clamp designed to solve the deficiencies of the above-mentioned technology.

[0004] The utility model designs an adjustable clamp, including a base, at least three fixed blocks are evenly distributed on the base in a circumferential direction, the rear ends of the fixed blocks abut against the inner wall of the annular workpiece, the base is circumferentially provided with mounting grooves corresponding to the fixed blocks, the fixed blocks are located in the mounting grooves, the fixed blocks and the base are provided with first threaded holes that communicate with each other, the two first threaded holes are connected by a first fastener, so that the fixed blocks are installed in the mounting grooves and can be adjusted radially along the base; the base is also provided with a second threaded hole, a second fastener is provided in the second threaded hole, and the top end of the second fastener abuts against the surface of the fixed block to pre-tighten the fixed block.

[0005] Preferably, the fixing block is a square block structure, and the surface thereof that contacts the inner wall of the annular workpiece is an arc surface, and the arc surface is adapted to the inner wall of the annular workpiece.

[0006] Preferably, the first threaded hole is opened on the fixing block radially relative to the base.

[0007] Further optimized, the top end of the second fastener abuts against one of the side surfaces of the fixing block.

[0008] Preferably, the side surface of the fixing block is provided with a first serrated texture, and the inner wall of the mounting groove in contact with the side surface of the fixing block is correspondingly provided with a second serrated texture adapted to the first serrated texture.

[0009] Further optimized, a smooth surface is provided on the side surface of the fixing block at the contact point of the second fastener, and the smooth surface extends radially along the base.

[0010] Preferably, the upper end or the lower end of the mounting groove is opened.

[0011] Preferably, the rear end surface of the fixing block is convex.

[0012] Further optimization is performed so that the front end of the fixing block contacts the inner wall of the installation groove, and the front end surface of the base is concave.

[0013] Preferably, a rotating shaft for driving the base to rotate is provided at the center of the bottom of the base.

[0014] The technical effect of the present invention is that a plurality of mounting grooves are arranged circumferentially on the base, a fixing block is arranged in each mounting groove, and the two contact surfaces of the fixing block and the mounting groove are provided with serrated textures, that is, the two tooth surfaces of the latch teeth are staggered and meshed with each other to realize the position adjustment of the fixing block relative to the mounting groove, which not only realizes the precise position adjustment of the fixing block, but also the limiting between the fixing block and the mounting groove is stable and reliable. The upper and lower ends of the mounting groove are both opened, and the fixing block can be inserted into the mounting groove from the top and bottom to realize the installation, realizing the latching fit between the fixing block and the mounting groove, and the radial position of the fixing block can be adjusted relative to the mounting groove, so that the fixing block can clamp annular workpieces of different inner diameters; threaded holes are provided on the fixing block and the base, and the fixing block is limited by fasteners such as bolts or screws, which is not only simple and stable in structure, but also easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a top view of the overall structure of the utility model;

[0016] Figure 2 This is a bottom view of the overall structure of the utility model;

[0017] Figure 3 This is an exploded view of the overall structure of the utility model;

[0018] Figure 4 It is a structural diagram of the fixed block in the utility model.

[0019] In the figure: 1. Base; 2. Mounting groove; 3. Fixing block; 4. Annular workpiece; 5. First threaded hole; 6. First fastener; 7. Second threaded hole; 8. Second fastener; 9. First serrated texture; 10. Second serrated texture; 11. Smooth surface; 12. Rotating axis. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.

[0021] The utility model includes a base 1, which is a cylindrical structure. At least three fixed blocks 3 are evenly distributed on the outer peripheral wall of the base 1, that is, multiple fixed blocks 3 are equidistantly distributed on the outer peripheral wall of the base 1, and the rear ends of the fixed blocks 3 abut against the inner wall of the annular workpiece 4. The annular workpiece 4 is a part to be processed. The rear ends of the fixed blocks 3 of the base 1 abut against the inner wall of the annular workpiece 4, so that the annular workpiece 4 is positioned and fixed on the base 1, which is convenient for processing the annular workpiece 4.

[0022] The base 1 is circumferentially provided with mounting grooves 2 corresponding to the fixing blocks 3. The depth of the mounting grooves 2 is extended along the radial direction of the base 1. The fixing blocks 3 are located in the mounting grooves 2. In this embodiment, the fixing blocks 3 are square-shaped structures, and the mounting grooves 2 are correspondingly square. After the fixing blocks 3 are placed in the mounting grooves 2, they form an adaptive limit with the mounting grooves 2. The front end of the fixing block 3 is located in the mounting grooves 2, and the rear end of the fixing block 3 extends out of the mounting grooves 2 and reaches the inner wall of the annular workpiece 4, thereby fixing the annular workpiece 4.

[0023] Both the fixed block 3 and the base 1 are provided with a first threaded hole 5. The two first threaded holes 5 are interconnected and connected by a first fastener 6, so that the fixed block 3 is installed in the mounting groove 2. By loosening or tightening the first fastener 6, the fixed block 3 can be adjusted radially along the base 1, thereby facilitating the fixing of annular workpieces 4 with different inner diameters. In this embodiment, there are two first threaded holes 5, which are distributed on the fixed block 3 up and down. The first threaded holes 5 on the fixed block 3 pass through the front and rear ends of the fixed block 3. The first fastener 6 is usually a bolt or a screw. The bolt or screw is inserted into the first threaded hole 5 from the rear end of the fixed block 3. The first threaded hole 5 on the base 1 is usually a blind hole. The bolt or screw passes through the first threaded hole 5 on the fixed block 3 and is inserted into the first threaded hole 5 on the base 1 to achieve connection. When the bolt or screw is loosened, the distance between the front end of the fixed block 3 and the base 1 can be adjusted, and then the bolt or screw is tightened again, so that the position of the fixed block 3 relative to the base 1 can be adjusted.

[0024] In addition, a second threaded hole 7 is provided on the base 1, and a second fastener 8 is provided in the second threaded hole 7. The top end of the second fastener 8 abuts against the surface of the fixed block 3 to pre-tighten the fixed block 3. In this embodiment, the second threaded hole 7 is opened on the outer peripheral wall of the base 1, and the tail end opening of the second threaded hole 7 is located on the inner wall of the mounting groove 2, and the second threaded hole 7 is perpendicular to the side of the fixing seat. When the second fastener 8 is installed in the second threaded hole 7, the top end of the second fastener 8 passes through the second threaded hole 7 and abuts against the side of the fixed block 3, thereby reinforcing and limiting the fixed block 3. The second fastener 8 is also a bolt or a screw. The number of second threaded holes 7 is two in a group, and the two in each group are distributed up and down, corresponding to the number of second fasteners 8. One fixed block 3 corresponds to one group of second threaded holes 7, that is, one fixed block 3 is reinforced by two second fasteners 8.

[0025] The rear end face of the fixing block 3, i.e., the side thereof that contacts the inner wall of the annular workpiece 4, is a convex arc surface, while the inner wall of the annular workpiece 4 is a concave arc surface. This allows the rear end face of the fixing block 3 to conform to the inner wall of the annular workpiece 4, enabling the fixing block 3 to firmly support and fix the annular workpiece 4. The rear end face of the fixing block 3 can be configured as a convex shape, minimizing the contact surface between the rear end face of the fixing block 3 and the inner wall of the annular workpiece 4, thereby better securing the annular workpiece 4. The convex portion can be a rubber layer, which not only increases static friction but also protects the contact surface between the fixing block 3 and the annular workpiece 4, preventing damage caused by friction.

[0026] The first threaded hole 5 is radially defined on the fixing block 3 relative to the base 1. That is, the first threaded hole 5 extends radially, extending through the front and rear ends of the fixing block 3. The first fastener 6 is inserted from the rear end of the fixing block 3 and connected to the base 1. Two first threaded holes 5 are provided for each fixing block 3, and the two first threaded holes 5 are distributed vertically on the fixing block 3.

[0027] Both sides of the fixing block 3 are provided with a first serrated texture 9, and the inner wall of the mounting groove 2 that contacts the side of the fixing block 3 is correspondingly provided with a second serrated texture 10 that is adapted to the first serrated texture 9. After the fixing block 3 is installed in the mounting groove 2, the first serrated texture 9 on the side of the fixing block 3 and the second serrated texture 10 on the inner wall of the mounting groove 2 engage with each other to prevent the fixing block 3 from shifting in position in the mounting groove 2, thereby ensuring the fixation between the fixing block 3 and the annular workpiece 4.

[0028] In addition, the parameters of the teeth of the first serrated texture 9 and the second serrated texture 10 can be changed, so that the position of the fixing block 3 can be adjusted more accurately.

[0029] In this embodiment, the textures of the first serrated texture 9 and the second serrated texture 10 cover the entire side surface of the fixed block 3. The serrations are conventional tooth structures. Of course, they can also be various tooth structures such as trapezoidal teeth and conical teeth. The coverage area of ​​the serrated texture can also be set according to actual working conditions. It can be full coverage, partial coverage, or partial array arrangement on the entire surface.

[0030] The upper end or the lower end of the installation groove 2 is opened, so that the fixing block 3 can be easily installed into the installation groove 2 from above.

[0031] In addition, a smooth surface 11 is provided on the side of the fixing block 3 at the point where the second fastener 8 contacts the fixing block 3, and the smooth surface 11 extends radially along the base 1 to prevent the top of the second fastener 8 from directly contacting the first serrated texture 9 on the side of the fixing block 3, thereby ensuring the accuracy of the positioning of the fixing block 3.

[0032] The front end of the fixing block 3 touches the inner wall of the mounting groove 2, and the front end surface of the fixing block 3 is concave. In this way, while ensuring the stable contact between the fixing block 3 and the inner wall of the mounting groove 2, the contact surface area between the front end of the fixing block 3 and the inner wall of the mounting groove 2 is reduced as much as possible, thereby avoiding wear between the fixing block 3 and the inner wall of the mounting groove 2.

[0033] A rotating shaft 12 is provided at the bottom center of the base 1 to drive the base 1 to rotate. The base 1 is fixed to an external device or a fixture through the rotating shaft 12 so that the base 1 can rotate along the rotating shaft 12, thereby facilitating the processing of the annular workpiece 4.

[0034] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, any technical solution that is the same or similar to that of the present application falls within the scope of protection of the present invention.

Claims

1. Adjustable clamp, characterized in that, The invention comprises a base (1), wherein the base (1) is evenly distributed with at least three fixing blocks (3), the rear ends of the fixing blocks (3) abut against the inner wall of the annular workpiece (4), the base (1) is circumferentially provided with mounting grooves (2) corresponding to the fixing blocks (3), the fixing blocks (3) are located in the mounting grooves (2), the fixing blocks (3) and the base (1) are provided with first threaded holes (5) communicating with each other, the two first threaded holes (5) are connected by a first fastener (6), so that the fixing blocks (3) are installed in the mounting grooves (2) and can be adjusted radially along the base (1); the base (1) is also provided with a second threaded hole (7), the second threaded hole (7) is provided with a second fastener (8), the top end of the second fastener (8) abuts against the surface of the fixing block (3) to pre-tighten the fixing block (3).

2. The adjustable clamp according to claim 1, characterized in that: The fixing block (3) is a square block structure, and the side thereof that contacts the inner wall of the annular workpiece (4) is an arc surface, and the arc surface is adapted to the inner wall of the annular workpiece (4).

3. The adjustable clamp according to claim 1, characterized in that: The first threaded hole (5) is radially opened on the fixing block (3) relative to the base (1).

4. The adjustable clamp according to claim 2, characterized in that: The top end of the second fastener (8) abuts against one of the side surfaces of the fixing block (3).

5. The adjustable clamp according to claim 1, characterized in that: The side surface of the fixing block (3) is provided with a first sawtooth texture (9), and the inner wall of the mounting groove (2) in contact with the side surface of the fixing block (3) is correspondingly provided with a second sawtooth texture (10) adapted to the first sawtooth texture (9).

6. The adjustable clamp according to claim 5, characterized in that: A smooth surface (11) is provided on the side surface of the fixing block (3) at the contact point with the second fastener (8), and the smooth surface (11) extends radially along the base (1).

7. The adjustable clamp according to claim 1, characterized in that: The upper end or the lower end of the installation groove (2) is opened.

8. The adjustable clamp according to claim 1, wherein: The rear end surface of the fixing block (3) is convex.

9. The adjustable clamp according to claim 8, characterized in that: The front end of the fixing block (3) abuts against the inner wall of the installation groove (2), and the front end surface of the base (1) is concave.

10. The adjustable clamp according to claim 1, wherein: A rotating shaft (12) for driving the base (1) to rotate is provided at the center of the bottom of the base (1).

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