CN110744086A - An inner expansion fit thin-walled roller clamping device - Google Patents

Abstract

The invention provides an inner expansion and fit type thin-walled roller clamping device, which comprises a mandrel on which a fixed top block, a floating top block and a movable top block are sleeved in sequence from front to back, and the fixed top block and the movable top The blocks have the same structure and are arranged symmetrically with each other. There are four tensioning blocks evenly distributed along the circumferential direction between the fixed top block and the floating top block, and four tensioning blocks are evenly distributed along the circumferential direction between the movable top block and the floating top block. , between the tensioning block and the fixed top block and between the tensioning block and the movable top block are connected by connecting rods. Compared with the prior art, the present invention has the beneficial effects that the rough machining and precision machining of the part can be completed in one clamping and positioning, and the size, shape accuracy and various dimensional position tolerances of the part are guaranteed.

Description

An inner expansion fit thin-walled roller clamping device

technical field

The invention relates to the technical field of precision manufacturing solutions, in particular to an inner expansion fit thin-walled roller clamping device.

Background technique

In the fields of mechanical processing and manufacturing, food processing, food manufacturing, light industry and other industries, as well as the production of conveyor line equipment in all walks of life, many equipments need to use roller parts. Such parts are generally characterized by large size, thin wall, high dimensional accuracy, high surface finish requirements, and high rolling accuracy. Therefore, it is difficult for general clamping and processing methods to meet the processing requirements and characteristics of such parts. In order to improve production efficiency, reduce production costs, and achieve processing accuracy, it is necessary to design professional clamping for the processing and manufacturing of different roller parts. Positioning device to meet the processing requirements and characteristics of roller parts.

At present, roller parts are characterized by thin walls, high dimensional accuracy, high surface finish requirements, and high rolling accuracy. Therefore, repeated clamping and positioning processing is not conducive to the manufacturing accuracy of such parts. When clamping parts with a conventional chuck, the interference of the clamping part cannot be completed at one time, and a second clamping is required. In this way, the accuracy and surface quality of the parts cannot be guaranteed. In addition, because the roller parts are generally thin-walled , it is easy to deform the parts with conventional clamping methods.

SUMMARY OF THE INVENTION

In order to solve the above problems, the present invention discloses an inner expansion fit thin-walled roller clamping device, which completes the rough machining and precision machining processes of the part in the case of one clamping and positioning, and ensures the size and shape accuracy of the part. and position tolerances for each dimension.

In order to achieve the above purpose, the present invention provides the following technical solutions:

An inner expansion fit thin-walled roller clamping device is characterized in that it comprises a mandrel on which a fixed top block, a floating top block and a movable top block are sequentially sleeved from front to back. The block and the movable top block have the same structure and are symmetrically arranged with each other. Four tensioning blocks are evenly distributed along the circumferential direction between the fixed top block and the floating top block, and the movable top block and the floating top block are evenly distributed along the circumferential direction. There are four tensioning blocks, which are connected by connecting rods between the tensioning block and the fixed top block and between the tensioning block and the movable top block; the vertical section of the tensioning block is an isosceles triangle, wherein two The face where the waist is located is the inclined surface of the tensioning block, the surface where the bottom edge is located is an arc surface, and the middle of the side where the top corner is located toward the bottom edge is provided with a first connecting rod installation groove, and the first connecting rod installation groove is connected to the two tensioning blocks. The inclined planes are connected, and the tension block positioning pin holes are symmetrically opened in the middle of both sides of the tension block; the fixed top block is a disc-shaped structure, and a through hole matching the core shaft is opened in the middle part along the axis direction, The side of the fixed top block close to the floating top block is evenly distributed with four top block inclined surfaces along the circumferential direction, the top block inclined surfaces are adapted to the tension block inclined surfaces, and the middle of the top block inclined surface is provided with a second connecting surface. rod installation groove, the middle of the two sides of the second connecting rod installation groove is symmetrically provided with second connecting rod fixing pin holes; the floating top block is a cylindrical structure, and the middle part is opened along the axis direction to match the core shaft The end of the floating top block is evenly distributed with four floating top block slopes along the circumferential direction, and the floating top block slopes are adapted to the tension block slopes; the two ends of the side of the connecting rod are respectively provided There is a connecting rod waist circular groove and a first connecting rod fixing pin hole, the first connecting rod fixing pin hole and the second connecting rod fixing pin hole are connected by a connecting rod fixing pin, and the connecting rod waist circular groove and the tension block The positioning pin holes are connected by the fixing pins of the tension block.

Further, the front section of the mandrel is provided with a mandrel positioning boss, the rear section is provided with an external thread, the middle end face of the rear end is provided with a mandrel thimble hole, the mandrel positioning boss and the front end of the fixed top block are provided. offset.

Further, the rear section of the mandrel is also sleeved with a washer and a nut arranged in the front and rear, the washer abuts against the rear end of the movable top block, and the nut is threadedly connected to the rear section of the mandrel.

Further, the eight tensioning blocks are fitted with thin-walled roller parts.

Compared with the prior art, the beneficial effects of the present invention are:

1. The method of the present invention is one clamp and one top. This method can best ensure the machining accuracy of parts in the mechanical manufacturing process, and can be used for turnover on different equipment to avoid accumulated errors in the processing process;

2. Using the thread as the axial thrust, the thrust is stable, reliable and adjustable;

3. The axial thrust is converted into radial thrust through the inclined plane, and the structure is clear and stable;

4. The tensioning block adopts two symmetrically arranged inclined surfaces to ensure that the radial movement of the tensioning block is reliable, stable and consistent;

5. The arc surface of the tensioning block is the same as the inner surface arc of the thin-walled roller parts. When tightening, it fits completely to ensure the most stable bonding force. At the same time, due to the surface contact, the thin-walled roller parts will not be deformed, which is effective. Control the accuracy of the parts processing process;

6. The vertical section of the tensioning block is an isosceles triangle. From the initial position to the tensioning position, the radial movement distance is large, so that the device can be expanded to be used for thin-walled rollers with edge reinforcing ribs at the roller mouth;

7. The connecting rod connecting the tensioning block has a waist circular groove structure at one end. When the tensioning block moves radially, the fixing pin of the tensioning block can slide in the groove to ensure that the tensioning block can smoothly complete the radial movement and the connecting rod can swing in a circular arc;

8. When the drum parts are long, the number of floating top blocks and tensioning blocks can be increased, the combination and expansion are convenient, the principle and process are unchanged, and the hardware expansion is easy to achieve.

Description of drawings

FIG. 1 is a schematic diagram of an inner expansion fit thin-walled roller clamping device of the present invention.

FIG. 2 is a schematic structural diagram of an inner expansion fit thin-walled roller clamping device according to the present invention.

FIG. 3 is a schematic structural diagram of a tension block in an inner expansion fit thin-walled roller clamping device according to the present invention.

FIG. 4 is a schematic structural diagram of a fixed top block in an inner expansion fit thin-walled roller clamping device according to the present invention.

FIG. 5 is a schematic structural diagram of a floating top block in an inner expansion fit thin-walled roller clamping device of the present invention.

FIG. 6 is a schematic structural diagram of a connecting rod in an inner expansion fit thin-walled roller clamping device according to the present invention.

FIG. 7 is a schematic diagram of the connection between the fixed top block and the tension block in an inner expansion fit thin-walled roller clamping device of the present invention.

FIG. 8 is a schematic structural diagram of a mandrel in an inner expansion fit thin-walled roller clamping device of the present invention.

FIG. 9 is a schematic view of an inner expansion fit thin-walled roller clamping device of the present invention when it is working.

List of reference numbers:

1-Spindle, 11-Spindle positioning boss, 12-Spindle thimble hole, 2-Fixed top block, 21-Second connecting rod fixing pin hole, 22-Top block slope, 23-Second connecting rod installation Slot, 3-tensioning block, 31-tensioning block inclined surface, 32-tensioning block positioning pin hole, 33-first connecting rod installation groove, 4-floating top block, 41-floating top block inclined surface, 5-movable top Block, 6-washer, 7-nut, 8-connecting rod fixing pin, 9-connecting rod, 91-connecting rod waist groove, 92-first connecting rod fixing pin hole, 10-tensioning block fixing pin, 13- Thin-walled roller parts, 14-centre, 15-spindle clamping mechanism.

Detailed ways

The present invention will be further clarified below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the words "inner" and "outer" ” refer to directions towards or away from the geometric center of a particular part, respectively.

As shown in the figure, an inner expansion fit thin-walled roller clamping device includes a mandrel 1, and a fixed top block 2, a floating top block 4 and a movable top block 5 are sequentially sleeved on the mandrel 1 from front to back. The fixed top block 2 and the movable top block 5 have the same structure and are arranged symmetrically with each other. There are four tension blocks 3 evenly distributed along the circumferential direction between the fixed top block 2 and the floating top block 4. The movable top block 5 and the floating top block 4 There are four tensioning blocks 3 evenly distributed in the circumferential direction, and between the tensioning block 3 and the fixed top block 2 and between the tensioning block 3 and the movable top block 5 are connected by connecting rods 9; The vertical section is an isosceles triangle, wherein the face where the two waists are located is the inclined surface 31 of the tension block, the surface where the bottom edge is located is an arc surface, and the middle part of the side where the top corner is located toward the bottom edge is provided with a first connecting rod installation slot 33, And the first connecting rod installation groove 33 is communicated with the two tensioning block inclined surfaces 31, the tensioning block positioning pin holes 32 are symmetrically opened in the middle of both sides of the tensioning block 3; the fixed top block 2 is a disc-shaped structure, and the middle part is along the axis. There is a through hole matching the mandrel 1 in the direction, and the side of the fixed top block 2 close to the floating top block 4 is evenly distributed with four top block inclined surfaces 22 along the circumferential direction, and the top block inclined surface 22 and the tension block inclined surface 31 The middle part of the inclined surface 22 of the top block is provided with a second connecting rod installation groove 23, and the middle part of both sides of the second connecting rod installation groove 23 is symmetrically opened with a second connecting rod fixing pin hole 21; the floating top block 4 is a cylindrical structure , the center of which is provided with a through hole adapted to the mandrel 1 along the axis direction, the end of the floating top block 4 is evenly distributed with four floating top block inclined surfaces 41 along the circumferential direction, the floating top block inclined surface 41 and the tension block inclined surface 31 is adapted; both ends of the side of the connecting rod 9 are respectively provided with a connecting rod waist circular groove 91 and a first connecting rod fixing pin hole 92, and the first connecting rod fixing pin hole 92 and the second connecting rod fixing pin hole 21 are connected through the connection. The rod fixing pin 8 is connected, and the connecting rod waist circular groove 91 and the tensioning block positioning pin hole 32 are connected through the tensioning block fixing pin 10 . The arc surface of the tensioning block 3 is consistent with the arc surface of the inner wall of the thin-walled roller part 13, thereby effectively ensuring that the arc surface is completely fitted during operation.

In this embodiment, the front section of the mandrel 1 is provided with a mandrel positioning boss 11, the rear section is provided with an external thread, and the middle of the rear end is provided with a mandrel thimble hole 12, the mandrel positioning boss 11 and the fixed top The front end of block 2 is offset.

In this embodiment, the rear section of the mandrel 1 is also sleeved with a washer 6 and a nut 7 arranged in the front and rear, the washer 6 is in contact with the rear end of the movable top block 5, and the nut 7 is screwed on the rear section of the mandrel 1. .

In this embodiment, thin-walled roller parts 13 are mounted on the outside of the eight tensioning blocks 3 .

The working principle of the present invention is as follows: when the parts are initially processed, the front end of the mandrel 1 of the device is clamped by the machine tool spindle clamping mechanism 15, the thin-walled roller part 13 is set into the inner expansion fit thin-walled roller clamping device, and the nut 7 is screwed. , Under the action of the thread, the nut 7 pushes the movable top block 5 and the floating top block 4 to do axial movement through the washer 6. Push out the tensioning block 3, make the tensioning block 3 move radially until the workpiece is tensioned, and use the center 14 concentric with the main shaft of the machine tool to stand against the center hole 12 of the mandrel. After the initial roughing is completed, the thin-walled roller parts together with The clamping device is removed together and placed on the finishing machine for direct use, which avoids more than two repeated positioning and clamping, and can ensure precision machining by different means under the condition that it is both safe and stable and ensures machining accuracy. Switch between operations.

The technical means disclosed in the solution of the present invention are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims (4)

1. An inner expansion fit thin-walled roller clamping device, characterized in that it comprises a mandrel (1), and the mandrel (1) is sequentially sleeved with a fixed top block (2), a floating A top block (4) and a movable top block (5), the fixed top block (2) and the movable top block (5) have the same structure and are arranged symmetrically with each other, the fixed top block (2) and the floating top block (4) There are four tensioning blocks (3) evenly distributed along the circumferential direction between the movable top block (5) and the floating top block (4), and four tensioning blocks (3) are evenly distributed along the circumferential direction. Between the tensioning block (3) and the fixed top block (2) and between the tensioning block (3) and the movable top block (5) are connected by connecting rods (9); The vertical section of the tensioning block (3) is an isosceles triangle, wherein the surfaces where the two waists are located are the oblique surfaces (31) of the tensioning block, the surface where the bottom edge is located is an arc surface, and the center of the edge where the top corner is located is toward the bottom edge. A first connecting rod installation groove (33) is opened on the surface, and the first connecting rod installation groove (33) is communicated with the inclined surfaces (31) of the two tensioning blocks, and the middle parts of the two sides of the tensioning block (3) are symmetrically opened with tensioning blocks (3). Tightening block positioning pin hole (32); The fixed top block (2) is a disc-shaped structure, and a through hole adapted to the mandrel (1) is opened in the middle part along the axis direction, and the fixed top block (2) is close to the floating top block (4). Four top block inclined surfaces (22) are evenly distributed along the circumferential direction on one side, the top block inclined surfaces (22) are adapted to the tensioning block inclined surfaces (31), and the middle of the top block inclined surface (22) is provided with a third block. Two connecting rod mounting grooves (23), and second connecting rod fixing pin holes (21) are symmetrically opened in the middle of both sides of the second connecting rod mounting groove (23); The floating top block (4) is a cylindrical structure, and a through hole that is adapted to the mandrel (1) is opened in the middle part along the axis direction, and the end of the floating top block (4) is uniformly distributed along the circumferential direction. four floating top block inclined surfaces (41), the floating top block inclined surfaces (41) are adapted to the tensioning block inclined surfaces (31); Both ends of the side surface of the connecting rod (9) are respectively provided with a connecting rod waist circular groove (91) and a first connecting rod fixing pin hole (92), and the first connecting rod fixing pin hole (92) is connected to the second connecting rod. The rod fixing pin hole (21) is connected by the connecting rod fixing pin (8), and the connecting rod waist circular groove (91) is connected with the tensioning block positioning pin hole (32) through the tensioning block fixing pin (10). 2. An inner expansion fit thin-walled roller clamping device according to claim 1, characterized in that: a mandrel positioning boss (11) is provided on the front section of the mandrel (1), and a mandrel positioning boss (11) is provided on the front section of the mandrel (1). There is an external thread on the top, a mandrel thimble hole (12) is opened in the middle of the rear end face, and the mandrel positioning boss (11) is in contact with the front end of the fixed top block (2). 3 . An inner expansion fit thin-walled roller clamping device according to claim 2 , wherein the rear section of the mandrel ( 1 ) is also sleeved with washers ( 6 ) and A nut (7), the washer (6) abuts against the rear end of the movable top block (5), and the nut (7) is threadedly connected to the rear section of the mandrel (1). 4. An inner expansion fit thin-walled roller clamping device according to claim 1, characterized in that: the eight tensioning blocks (3) are fitted with thin-walled roller parts (13) externally.

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