Feeding positioning and fixing device

Abstract

The utility model discloses a feeding positioning and fixing device, which is used for feeding, positioning and fixing annular workpieces and comprises a positioning component, a positioning component and a positioning component, the positioning component comprises a positioning sleeve and an elastic chuck, the front end of the positioning sleeve is provided with a positioning surface matched with the rear end of the workpiece, and the elastic chuck is arranged at the front end of the positioning sleeve; the fixing assembly comprises a tensioning piece matched with the elastic chuck, an elastic piece arranged on the rear side of the tensioning piece and a clamping piece, the tensioning piece moves along the elastic chuck from front to back to enable the elastic chuck to expand towards the outer side, and the rear end of the clamping piece is provided with a clamping face matched with the front end face of a workpiece; and the driving piece is connected with the fixing assembly and drives the fixing assembly to reciprocate in the front-back direction. According to the feeding, positioning and fixing device, automatic feeding, positioning and fixing of workpieces can be completed, and damage to the workpieces caused by inclined positioning can be avoided; the acting force for fixing the workpiece can be adjusted, adjustment is convenient and reliable, and the acting force for fixing the workpiece can be accurately adjusted and controlled.

Description

Technical Field

[0001] This utility model relates to a feeding, positioning and fixing device. Background Technology

[0002] like Figure 1 The image shows a stamped automotive engine drive wheel. After stretch forming, there is burr on the flange surface, which needs to be removed by machining.

[0003] The transmission wheel has the following characteristics: (1) Thin wall thickness, with a maximum wall thickness of 2mm and a minimum wall thickness of 1.6mm; (2) The inner hole is a bearing hole, requiring high dimensional tolerance and high precision; (3) To reduce noise and vibration, the perpendicularity between the flange surface and the inner hole is required to be ≤0.1. Therefore, during the flash removal process, if the positioning force and clamping force on the workpiece (automobile engine transmission wheel) are too large, it will cause the workpiece to deform, destroying the original dimensional accuracy and form and position tolerance requirements. If the positioning force and clamping force are too small, the workpiece will easily slip during cutting, causing scratches on the workpiece and failing to achieve the purpose of flash removal.

[0004] The existing process uses a CNC lathe to remove flash, and the positioning and clamping method is to use a hydraulic pull rod to push the chuck. The existing technology has the following shortcomings: (1) The pressure adjustment range of the hydraulic system is large, making it difficult to accurately adjust and control the force of fixing the workpiece. Taking the 80 cylinder of the conventional configuration of the CNC lathe as an example, even if the adjustment is made with a resolution of 0.1MPa, the change in its tension force is 43.2kg, which is difficult to adjust. If the pressure is too high, the workpiece will be deformed, and the inner hole size and perpendicularity may be out of tolerance. If the pressure is too low, the flash will slip during the turning process; (2) The loading and unloading of the existing technology are done manually, which is inefficient. The positioning of the flange surface relies on the subjective judgment of the worker, which is prone to failure of the flange surface positioning, resulting in the scrapping of the workpiece.

[0005] In view of this, the inventors of this application have invented a feeding, positioning and fixing device. Utility Model Content

[0006] The purpose of this utility model is to provide a feeding, positioning and fixing device that is compact in structure, reliable in positioning, and can avoid damage to or slippage of the workpiece.

[0007] To achieve the above objectives, this utility model adopts the following technical solution: a feeding, positioning, and fixing device for feeding, positioning, and fixing a ring-shaped workpiece, comprising:

[0008] A positioning component includes a positioning sleeve and an elastic chuck. The front end of the positioning sleeve is provided with a positioning surface that mates with the rear end of the workpiece, and the elastic chuck is located at the front end of the positioning sleeve.

[0009] The fixing assembly includes a tensioning member adapted to the elastic chuck, an elastic member disposed behind the tensioning member, and a clamping member. The tensioning member moves along the elastic chuck from front to back, causing the elastic chuck to expand outward. The rear end of the clamping member has a clamping surface that mates with the front end face of the workpiece.

[0010] A driving component is connected to the fixed component and drives the fixed component to reciprocate in the front-back direction.

[0011] The driving component drives the fixing component to move from front to back. When the fixing component reaches the first position, the tensioning component extends into the workpiece. The fixing component continues to move backward and drives the workpiece to reach the second position. At this time, the rear end of the workpiece surrounds the outer periphery of the elastic chuck and the rear end face of the workpiece is positioned and fitted with the positioning surface of the positioning sleeve. The fixing component continues to move backward, causing the tensioning component to drive the elastic chuck to slowly expand outward to press against the inner wall of the workpiece. At the same time, the clamping surface of the clamping component fits against and clamps the front end face of the workpiece.

[0012] Furthermore, the fixing component also includes an adjusting member, the elastic member abuts against the rear end of the adjusting member, the tensioning member is connected to the adjusting member, and the front-to-back position between the tensioning member and the adjusting member is adjustable.

[0013] Furthermore, the tensioning member is sleeved on the outer periphery of the adjusting member, and the tensioning member is threadedly engaged with the adjusting member. An arc-shaped groove is provided along the outer periphery of the tensioning member, and a locking bolt is provided corresponding to the arc-shaped groove.

[0014] Furthermore, the fixing component also includes a fixing seat, which is connected and fixed to the driving member. The rear end of the fixing seat is provided with a mounting groove, and the elastic member is installed in the mounting groove. One end of the adjusting member is located in the mounting groove and abuts against the elastic member, while the other end extends out of the mounting groove and is connected to the tensioning member.

[0015] Furthermore, the elastic element is a disc spring, the rear end of the adjusting element is provided with a limiting protrusion, the mounting groove opening is provided with a fixing plate, and the fixing plate restricts the limiting protrusion from disengaging from the mounting groove.

[0016] Furthermore, the fixing component also includes a fixing seat, which is connected and fixed to the driving member, and the clamping member is located at the front end of the fixing seat.

[0017] Furthermore, the clamping member includes a positioning plate and a positioning ring disposed on the rear side of the positioning plate. The rear end face of the positioning ring forms the clamping surface. The positioning plate is connected and fixed to the fixed seat. A compression spring is provided between the positioning plate and the positioning ring.

[0018] Furthermore, the elastic chuck includes multiple elastic jaws, and the inner surface of each elastic jaw is a guide slope that cooperates with the tensioning member.

[0019] Furthermore, the positioning surface is annular, and multiple guide blocks are provided along the positioning surface. The elastic clamp is fixed to the front end of the positioning sleeve, and the elastic claws are embedded in the gaps between the guide blocks.

[0020] Furthermore, the fixing component also includes an outwardly protruding elastic ring, and the outer periphery of the elastic ring is adapted to the inner wall of the workpiece. When the fixing component reaches the first position, the elastic ring is tightly attached to the inner wall of the workpiece.

[0021] By adopting the above technical solution, this utility model has the following advantages compared with the prior art:

[0022] This utility model feeding, positioning and fixing device has a compact structure and ingenious design. It can automatically feed, position and fix the workpiece. It positions first and then clamps, which is reliable and can avoid workpiece damage caused by misalignment. By adjusting the relative positions of the tensioning and adjusting components, the force for fixing the workpiece can be adjusted. The adjustment is convenient and reliable, and the force for fixing the workpiece can be precisely controlled to avoid workpiece deformation due to excessive force or workpiece slippage due to insufficient force. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the transmission wheel of an automobile engine according to an embodiment of the present utility model, with enlarged illustrations showing the process before and after flash removal;

[0024] Figure 2 This is a perspective view of the positioning component in an embodiment of the present utility model;

[0025] Figure 3 This is an exploded view of the positioning component in an embodiment of the present invention;

[0026] Figure 4 This is a cross-sectional view of the positioning component in an embodiment of the present utility model;

[0027] Figure 5 This is a perspective view of the fixing component in an embodiment of the present utility model;

[0028] Figure 6 This is an exploded view of the fixing component in an embodiment of the present utility model;

[0029] Figure 7 This is a cross-sectional view of the fixing component in an embodiment of the present utility model;

[0030] Figures 8 to 13 This is a schematic diagram illustrating the working process of the feeding, positioning, and fixing device according to an embodiment of the present invention. Figure 9 , Figure 10 , Figure 11 The figures shown correspond to the fixed components being located at the first, second, and third positions, respectively. Figure 12As shown, the compression spring is compressed due to the movement of the fixed seat, but the elastic element has not yet been compressed. Figure 13 As shown, the workpiece is clamped and fixed at this point.

[0031] Explanation of reference numerals in the attached figures:

[0032] 10-Workpiece, 11-Flash,

[0033] 20-Positioning component,

[0034] 21-Positioning sleeve, 211-Positioning surface, 212-Guide block,

[0035] 22-Elastic chuck, 221-Elastic gripper, 222-Guide ramp,

[0036] 30-Fixed component,

[0037] 31-Tensioner, 311-Conical surface, 312-Arc groove, 313-Locking bolt.

[0038] 32-Elastic element,

[0039] 33-Clamping component, 331-Clamping surface, 332-Positioning pressure plate, 333-Positioning ring, 334-Compression spring

[0040] 34-Adjusting element, 341-Limiting flange,

[0041] 35-Fixed base, 351-Mounting slot, 352-Fixed plate,

[0042] 36-Elastic band. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0044] It should be noted that in this utility model, the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", and "outer" are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element of this utility model must have a specific orientation, and therefore should not be construed as a limitation of this utility model. Example

[0045] Cooperate Figures 1 to 13 As shown, this utility model discloses a feeding, positioning, and fixing device for feeding, positioning, and fixing a ring-shaped workpiece 10. After the workpiece 10 is fixed, it can be processed. This embodiment uses... Figure 1The illustrated automotive engine drive wheel serves as an example of workpiece 10 to be processed. After workpiece 10 is fixed, burrs 11 can be removed or other operations can be performed on it. Of course, the device of this application can also be used for feeding, positioning, and fixing other suitable workpieces, and there are no limitations on this application.

[0046] Cooperate Figures 2 to 13 As shown, a feeding, positioning, and fixing device includes:

[0047] The positioning component 20 includes a positioning sleeve 21 and an elastic clamp 22. The front end of the positioning sleeve 21 is provided with a positioning surface 211 that cooperates with the rear end of the workpiece 10, and the elastic clamp 22 is located at the front end of the positioning sleeve 21.

[0048] The fixing component 30 includes a tensioning member 31 adapted to the elastic clamp 22, an elastic member 32 disposed on the rear side of the tensioning member 31, and a clamping member 33. The tensioning member 31 moves along the elastic clamp 22 from front to back to expand the elastic clamp 22 outward. The rear end of the clamping member 33 has a clamping surface 331 that mates with the front end face of the workpiece 10.

[0049] A driving component (not shown in the figure) is connected to the fixing component 30 and drives the fixing component 30 to reciprocate in the front-back direction.

[0050] The driving component drives the fixing assembly 30 to move from front to back. When the fixing assembly 30 reaches the first position, the tensioning member 31 extends into the workpiece 10. The fixing assembly 30 continues to move to the rear and drives the workpiece 10 to reach the second position. At this time, the rear end of the workpiece 10 surrounds the outer periphery of the elastic chuck 22 and the rear end face of the workpiece 10 is positioned and fitted with the positioning surface 211 of the positioning sleeve 21. The fixing assembly 30 continues to move to the rear, causing the tensioning member 31 to drive the elastic chuck 22 to slowly expand outward to press the inner wall of the workpiece 10. At the same time, the clamping surface 331 of the clamping member 33 fits and clamps the front end face of the workpiece 10.

[0051] Cooperate Figures 2 to 4As shown, the positioning sleeve 21 is connected to the machine tool spindle, which can drive the positioning sleeve 21 and the elastic chuck 22 to rotate (to remove the flash 11 from the workpiece 10). The fixing component 30 is connected and fixed to the driving component, which drives the fixing component 30 to reciprocate in the front-back direction, completing the feeding (to the positioning component 20 for fixing), positioning, and fixing of the workpiece 10. The positioning component 20 and the fixing component 30 are located on the same axis extending front-back. On their sides, there are respectively a workpiece 10 loading mechanism and a workpiece unloading mechanism (not shown in the figure). The loading mechanism feeds the workpiece 10 to be processed between the fixing component 30 and the positioning component 20, so that the fixing component 30 and the positioning component 20 can position and fix it, and then the workpiece 10 can be processed (removing the flash 11). The unloading mechanism removes the processed workpiece 10 and sends it to the next process. The driving component is preferably a cylinder, and the piston rod of the cylinder is connected and fixed to the front end of the fixing component 30.

[0052] During operation, the driving component drives the fixing assembly 30 to move from front to back (moving towards the positioning assembly 20). When the fixing assembly 30 reaches the first position, it can then drive the workpiece 10 to move together, thereby completing the automatic feeding of the workpiece 10. When the fixing assembly 30 and the workpiece 10 reach the second position together, the rear end face of the workpiece 10 is positioned and fitted with the positioning surface 211 of the positioning sleeve 21, completing the automatic positioning of the workpiece 10. Afterwards, the fixing assembly 30 continues to move rearward relative to the workpiece 10 until the workpiece 10 is pressed and fixed. Through the device of this application, the automatic feeding, positioning and fixing of the workpiece 10 are realized. Moreover, the workpiece 10 is positioned first and then clamped, which ensures reliable positioning and avoids damage to the workpiece 10 caused by misalignment.

[0053] The elastic chuck 22 includes multiple elastic jaws 221, the inner surface of which is a guide slope 222 that cooperates with the tensioning member 31. Specifically, the guide slope 222 is inclined from front to back toward the center of the elastic chuck 22. Correspondingly, the outer peripheral surface of the front end of the tensioning member 31 is a conical surface 311 that cooperates with the guide slope 222. When the tensioning member 31 moves along the elastic chuck 22 from front to back, the conical surface 311 of the tensioning member 31 cooperates with the guide slope 222, driving each elastic jaw 221 to expand outward until the outer surface of the elastic jaw 221 is pressed against the inner wall of the workpiece 10 (the workpiece 10 surrounds the outer periphery of the elastic jaw 221).

[0054] The positioning surface 211 is annular, and multiple guide blocks 212 are provided along the positioning surface 211. The elastic clamp 22 is fixed to the front end of the positioning sleeve 21, and the elastic claws 221 are embedded in the gaps between the guide blocks 212. The positioning surface 211 is located at the front end of the positioning sleeve 21 and is annular. The outer surface of the front end of the guide block 212 is a conical surface 311, which facilitates the workpiece 10 to be fitted onto the outer periphery of the guide block 212 (elastic claw 221). Specifically, the guide blocks 212 are evenly arranged along the circumference of the positioning surface 211. The elastic grippers 221 are evenly arranged along the circumferential direction of the elastic chuck 22. The elastic grippers 221 are correspondingly embedded in the middle of the front end face of the positioning sleeve 21 and locked and fixed to the positioning sleeve 21 by bolts. At the same time, the elastic grippers 221 are precisely embedded in the gaps between the guide blocks 212. In addition, with the positioning surface 211 as a reference, the height of the guide block 212 is higher than the height of the elastic grippers 221. That is, the workpiece 10 is first placed on the outer periphery of the guide block 212 and then on the outer periphery of the elastic grippers 221. The guide block 212 and the inner wall of the workpiece 10 are in clearance fit.

[0055] Cooperate Figures 5 to 7 As shown, the fixing assembly 30 also includes an adjusting member 34, the elastic member 32 abuts against the rear end of the adjusting member 34, the tensioning member 31 is connected to the adjusting member 34, and the front-to-back position between the tensioning member 31 and the adjusting member 34 is adjustable. When the tensioning member 31 moves from front to back along the inner wall of the elastic gripper 221, the elastic member 32 provides a clamping force to the tensioning member 31. By adjusting the front-to-back position between the tensioning member 31 and the adjusting member 34, the front-to-back position of the elastic member 32 and the tensioning member 31 changes accordingly. When the tensioning member 31 moves into position and the workpiece 10 is clamped and fixed (in this state, the relative position of the tensioning member 31 and the elastic gripper 221 is fixed), the deformation of the elastic member 32 will also change, thus changing the clamping force of the tensioning member 31 acting on the elastic gripper 221, that is, changing the clamping force of fixing the workpiece 10. The clamping force of the fixed workpiece 10 can be adjusted by simply adjusting the front and rear positions of the tensioning member 31 and the adjusting member 34. The adjustment is convenient and reliable, and the adjustment range is small. The clamping force of the tensioning member 31 on the workpiece 10 can be precisely adjusted to avoid the clamping force being too large, causing deformation of the inner hole, or too small, causing the workpiece 10 to slip.

[0056] The specific cooperation between the adjusting member 34 and the tensioning member 31 is as follows: The tensioning member 31 is sleeved on the outer periphery of the adjusting member 34, and the tensioning member 31 and the adjusting member 34 are threaded together. An arc-shaped groove 312 is provided along the outer periphery of the tensioning member 31, and a locking bolt 313 is provided corresponding to the arc-shaped groove 312. The adjusting member 34 has an external thread, and the tensioning member 31 has an internal thread that mates with it. Rotating the tensioning member 31 causes it to move back and forth relative to the adjusting member 34, thereby adjusting the front and back position between the tensioning member 31 and the adjusting member 34. Furthermore, the tensioning member 31 is annular, with an arc-shaped groove 312 along its outer periphery, and a locking bolt 313 is provided corresponding to the arc-shaped groove 312. When the tensioning member 31 is rotated to the desired position, the locking bolt 313 is locked, and the tensioning member 31 can no longer move relative to the adjusting member 34, avoiding inaccurate clamping force at the tensioning member 31 in the future.

[0057] The fixing assembly 30 further includes a fixing seat 35, which is connected and fixed to the driving component. The rear end of the fixing seat 35 has a mounting groove 351. The elastic element 32 is installed in the mounting groove 351. One end of the adjusting element 34 is located in the mounting groove 351 and abuts against the elastic element 32, while the other end extends out of the mounting groove 351 and connects to the tensioning element 31. The front end of the fixing seat 35 is connected and fixed to the piston rod of the cylinder (driving component). The elastic element 32 is installed in the mounting groove 351, with one end abutting against the bottom of the groove and the other end abutting against the front end of the adjusting element 34. Specifically, the elastic element 32 is a disc spring. The rear end of the adjusting element 34 has a limiting flange 341. The opening of the mounting groove 351 has a fixing plate 352, which restricts the limiting flange 341 from disengaging from the mounting groove 351. The fixing plate 352 is annular and is sleeved on the outer periphery of the adjusting member 34 and locked and fixed at the rear end of the fixing seat 35. The limiting protrusion 341 is located in the mounting groove 351 and abuts against the elastic member 32. Under the action of the fixing plate 352, the limiting protrusion 341 can only move back and forth in the mounting groove 351, thus preventing the adjusting member 34 from disengaging from the fixing seat 35.

[0058] The fixing component 30 also includes an outwardly protruding elastic ring 36, the outer periphery of which is adapted to the inner wall of the workpiece 10. When the fixing component 30 reaches the first position, the elastic ring 36 is tightly attached to the inner wall of the workpiece 10. The elastic ring 36 is elastic, and by engaging with the inner wall of the workpiece 10, it drives the workpiece 10 to move together with the fixing component 30, effectively preventing scratches on the inner wall of the workpiece 10. Specifically, the elastic ring 36 is an O-ring, which is disposed on the outer periphery of the fixing seat 35 and protrudes 0.1-0.3mm from the outer periphery surface of the fixing seat 35.

[0059] The clamping member 33 is located at the front end of the fixed base 35. Specifically, the clamping member 33 includes a clamping surface 331 formed by the rear end face of the positioning ring 333, a positioning pressure plate 332 connected and fixed to the fixed base 35, and a compression spring 334 provided between the positioning pressure plate 332 and the positioning ring 333. Both the positioning pressure plate 332 and the positioning ring 333 are annular and are fitted onto the front end of the fixed base 35. The positioning pressure plate is locked and fixed to the fixed base 35 by bolts. Multiple compression springs 334 are provided between the positioning pressure plate 332 and the positioning ring 333, and the compression springs 334 provide clamping force for the clamping surface 331 to clamp the front end face of the workpiece 10.

[0060] When the fixing component 30 is in the second position, the rear end face of the workpiece 10 is positioned and fitted with the positioning surface 211. Then, the fixing component 30 continues to move rearward relative to the workpiece 10 until the fixing component 30 reaches the third position. At this time, the clamping surface 331 is exactly fitted with the front end face of the workpiece 10. Then, the fixing component 30 continues to move rearward, the positioning pressure plate 332 moves relative to the positioning ring 333, and the compression spring 334 is compressed to provide clamping force to the clamping surface 331 of the positioning ring 333. Subsequently, the elastic element 32 provides elastic force to drive the tensioning element 31 to drive the elastic gripper 221 to expand outward. When the tensioning element 31 moves into place, the magnitude of the clamping force of the tensioning element 31 on the inner wall of the workpiece 10 and the clamping force of the clamping surface 331 on the end face of the workpiece 10 are exactly the preset force. In this way, the magnitude of the fixing force on the workpiece 10 is appropriate, so that the workpiece 10 will not be deformed or slipped. Adjusting the position of the tensioning element 31 can also adjust the clamping force exerted by the clamping surface 331 on the end face of the workpiece 10.

[0061] Cooperate Figures 8 to 13 As shown, the working process of the device is as follows: the feeding mechanism sends the workpiece 10 to be processed to the corresponding position (located between the fixed component 30 and the positioning component 20), the driving component drives the fixed component 30 to move from front to back, and when the fixed component 30 moves to the first position, it cooperates with the positioning component 20. Figure 9 As shown, at this time, the tensioner 31 extends into the workpiece 10, and the elastic ring 36 is compressed and pressed tightly against the inner wall of the workpiece 10.

[0062] The fixing component 30 continues to move rearward, driving the workpiece 10 to move synchronously. When the fixing component 30 reaches the second position, it cooperates with... Figure 10 As shown, at this time, the rear end of the workpiece 10 surrounds the outer periphery of the elastic gripper 221 and the guide block 212, while the rear end face of the workpiece 10 is positioned and fitted with the positioning surface 211 of the positioning sleeve 21.

[0063] The fixing component 30 continues to move rearward, and the workpiece 10 stops moving under the action of the positioning surface 211. When the fixing component 30 reaches the third position, it cooperates... Figure 11As shown, at this time, the clamping surface 331 is exactly in contact with the front end face of the workpiece 10, the tensioning member 31 extends into the elastic jaw 221, and the conical surface 311 of the tensioning member 31 is exactly in contact with the guide inclined surface 222.

[0064] The fixing component 30 continues to move rearward, and the positioning plate 332 moves relative to the positioning ring 333, cooperating with... Figures 12 to 13 As shown, the compression spring 334 is compressed to provide clamping force to the clamping surface 331 of the positioning ring 333. Subsequently, the conical surface 311 of the tensioning member 31 cooperates with the guide inclined surface 222 and moves along the guide inclined surface 222. The elastic member 32 provides elastic force to drive the elastic gripper 221 to expand outward. When the tensioning member 31 moves to the position, the elastic chuck 22 just presses against the inner wall of the workpiece 10, and the positioning ring 333 tightens the end face of the workpiece 10, completing the feeding, positioning and fixing of the workpiece 10. After the workpiece 10 is fixed, it can be processed to remove the flash 11 of the workpiece 10. After the workpiece 10 is processed, it is unloaded by the unloading mechanism and sent to the next process.

[0065] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A feed positioning fixture, characterized by: The application relates to a feeding, positioning and fixing device for ring-shaped workpieces, which comprises the following components: a positioning assembly, which comprises a positioning sleeve and an elastic chuck, wherein the front end of the positioning sleeve is provided with a positioning surface matched with the rear end of the workpiece, and the elastic chuck is arranged at the front end of the positioning sleeve; a fixing assembly, which comprises a tensioning piece matched with the elastic chuck, an elastic piece arranged at the rear side of the tensioning piece, and a clamping piece, wherein the tensioning piece is moved from front to back along the elastic chuck to expand the elastic chuck outward, and the rear end of the clamping piece is provided with a clamping surface matched with the front end surface of the workpiece; a driving piece connected with the fixing assembly to drive the fixing assembly to reciprocate in the front-rear direction; the driving piece drives the fixing assembly to move from front to back, and the fixing assembly moves to a first position, at which time the tensioning piece extends into the workpiece, and the fixing assembly continues to move to the rear side and drives the workpiece to move to a second position synchronously, at which time the rear end of the workpiece is wrapped around the outer periphery of the elastic chuck, and the rear end surface of the workpiece is positioned and attached to the positioning surface of the positioning sleeve, and the fixing assembly continues to move to the rear side to make the tensioning piece drive the elastic chuck to expand outward slowly to press the inner wall of the workpiece, and meanwhile the clamping surface of the clamping piece is attached to the front end surface of the workpiece.

2. The material positioning and holding device of claim 1, wherein: The fixing assembly further comprises an adjusting piece, the elastic piece is abutted against the rear end of the adjusting piece, the tensioning piece is connected with the adjusting piece, and the front-rear position between the tensioning piece and the adjusting piece is adjustable.

3. A feed positioning fixture as claimed in claim 2, wherein: The tensioning piece is arranged on the outer periphery of the adjusting piece, the tensioning piece is threadedly matched with the adjusting piece, an arc-shaped groove is arranged along the outer periphery of the tensioning piece, and a locking bolt is arranged correspondingly to the arc-shaped groove.

4. A feed positioning and securing device as claimed in claim 2 or 3, characterized in that: The fixing assembly further comprises a fixing seat, the fixing seat is connected with the driving piece to be fixed, the rear end of the fixing seat is provided with a mounting groove, the elastic piece is mounted in the mounting groove, one end of the adjusting piece is located in the mounting groove and is abutted against the elastic piece, and the other end of the adjusting piece extends out of the mounting groove and is connected with the tensioning piece.

5. A feed positioning fixture as claimed in claim 4, wherein: The elastic piece is a disc spring, the rear end of the adjusting piece is provided with a limiting convex edge, the mounting groove is provided with a fixed plate, and the fixed plate limits the limiting convex edge from separating from the mounting groove.

6. A feed positioning fixture as claimed in claim 1, wherein: The fixing assembly further comprises a fixing seat, the fixing seat is connected with the driving piece to be fixed, and the clamping piece is arranged at the front end of the fixing seat.

7. A feed positioning fixture as claimed in claim 6, characterized in that: The clamping piece comprises a positioning pressing plate and a positioning ring arranged at the rear side of the positioning pressing plate, the rear end surface of the positioning ring forms the clamping surface, the positioning pressing plate is connected with the fixing seat to be fixed, and a compression spring is arranged between the positioning pressing plate and the positioning ring.

8. The material positioning and holding apparatus of claim 1 wherein: The elastic chuck comprises a plurality of elastic clamping claws, and the inner side surface of the elastic clamping claw is a guide inclined surface matched with the tensioning piece.

9. A feed positioning fixture as claimed in claim 8, characterized in that: The positioning surface is annular, a plurality of guide blocks are arranged along the positioning surface, the elastic chuck is fixed at the front end of the positioning sleeve, and the elastic clamping claws are embedded in the gaps between the guide blocks one by one.

10. The material positioning and holding apparatus of claim 1 wherein: The fixing assembly further comprises an outwardly convex elastic ring, and the outer periphery of the elastic ring is matched with the inner wall of the workpiece, when the fixing assembly reaches the first position, the elastic ring is attached to the inner wall of the workpiece.

Images