Feeding positioning and fixing device

Abstract

The invention discloses a feeding positioning and fixing device, which is used for feeding, positioning and fixing an annular workpiece, and comprises a positioning component, 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 workpiece damage 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] The invention relates to a feeding positioning and fixing device. Background Art

[0002] like Figure 1 The figure shows a stamped automobile engine transmission wheel. After stretching, there is flash on the flange surface, which needs to be removed by turning.

[0003] The transmission wheel has the following characteristics: (1) thin wall thickness, with a maximum wall thickness of 2 mm and a minimum wall thickness of 1.6; (2) the inner hole is a bearing hole, with high dimensional tolerance requirements and high precision level; (3) in order to reduce noise and vibration, the verticality 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, the workpiece will be deformed, destroying the original dimensional accuracy and form and position tolerance requirements; if the positioning force and clamping force are too small, the workpiece is easy to slip during cutting, causing scratches on the workpiece, and the purpose of flash removal cannot be achieved.

[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 hydraulic system has a large pressure adjustment range, and it is difficult to accurately adjust and control the force to fix the workpiece. Taking the 80 cylinders of the conventional CNC lathe as an example, even if it is adjusted at a resolution of 0.1MPa, the change in its tensioning force is as much as 43.2kg, which is difficult to adjust. If the pressure is too high, the workpiece will be deformed, and the inner hole size and verticality may be out of tolerance. If the pressure is too low, the flash will slip during turning; (2) The existing technology is manually operated for loading and unloading, which is inefficient. The positioning of the flange surface relies on the subjective judgment of the worker, which is prone to the flange surface being not positioned properly, resulting in the scrapping of the workpiece.

[0005] In view of this, the inventor of the present application invented a feeding positioning and fixing device. Summary of the invention

[0006] The object of the present invention is to provide a feeding positioning and fixing device which has a compact structure, reliable positioning and can avoid damage to the workpiece or slipping of the workpiece.

[0007] To achieve the above purpose, the present invention adopts the following technical solution: a feeding, positioning and fixing device for feeding, positioning and fixing annular workpieces, comprising: The positioning assembly 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, comprising a tensioning member adapted to the elastic chuck, an elastic member and a clamping member arranged at the rear side of the tensioning member, wherein the tensioning member moves from front to rear along the elastic chuck to expand the elastic chuck outward, and the rear end of the clamping member has a clamping surface matched with the front end surface of the workpiece; A driving member connected to the fixing assembly to drive the fixing assembly to reciprocate in a front-rear direction; The driving member drives the fixing assembly to move from front to back, and the fixing assembly moves to the first position. At this time, the tensioning member extends into the interior of the workpiece, and the fixing assembly continues to move backward and drives the workpiece to synchronously 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 fits with the positioning surface of the positioning sleeve. The fixing assembly continues to move backward so that the tensioning member drives the elastic chuck to slowly expand outward to press the inner wall of the workpiece, and at the same time, the clamping surface of the clamping member fits with the front end face of the clamped workpiece.

[0008] Furthermore, the fixing assembly also includes an adjusting member, the elastic member abuts against a rear end of the adjusting member, the tensioning member is connected to the adjusting member, and the front-rear position between the tensioning member and the adjusting member is adjustable.

[0009] Furthermore, the tensioning member is sleeved on the outer circumference of the adjusting member, and the tensioning member is threadedly matched with the adjusting member. An arc groove is provided along the outer circumference of the tensioning member, and a locking bolt is provided corresponding to the arc groove.

[0010] Furthermore, the fixing assembly also includes a fixing seat, which is connected and fixed to the driving member, and a mounting groove is provided at the rear end of the fixing seat, 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, and the other end extends out of the mounting groove and is connected to the tensioning member.

[0011] Furthermore, the elastic member is a disc spring, a limiting convex edge is provided at the rear end of the adjusting member, a fixing plate is provided at the notch of the mounting groove, and the fixing plate limits the limiting convex edge from leaving the mounting groove.

[0012] Furthermore, the fixing assembly also includes a fixing seat, the fixing seat is connected and fixed to the driving member, and the clamping member is arranged at the front end of the fixing seat.

[0013] Furthermore, the clamping member includes a positioning pressure plate and a positioning ring arranged at the rear side of the positioning pressure plate, the rear end surface of the positioning ring forms the clamping surface, the positioning pressure plate is connected and fixed to the fixing seat, and a compression spring is arranged between the positioning pressure plate and the positioning ring.

[0014] Furthermore, the elastic clamp includes a plurality of elastic clamping jaws, and the inner side surfaces of the elastic clamping jaws are guiding inclined surfaces that cooperate with the tensioning member.

[0015] Furthermore, the positioning surface is annular, and a plurality of guide blocks are arranged along the positioning surface. The elastic clamp is fixed to the front end of the positioning sleeve, and the elastic clamping claws are embedded one by one in the gaps between the guide blocks.

[0016] Furthermore, the fixing assembly further comprises an outwardly protruding elastic ring, and the outer periphery of the elastic ring is adapted to the inner wall of the workpiece, and when the fixing assembly reaches the first position, the elastic ring is in close contact with the inner wall of the workpiece.

[0017] After adopting the above technical solution, the present invention has the following advantages compared with the prior art: The feeding, positioning and fixing device of the present invention has a compact structure and ingenious design, and can complete the automatic feeding, positioning and fixing of the workpiece. It positions first and then clamps, and the positioning is reliable, and damage to the workpiece caused by skewed positioning can be avoided. The force for fixing the workpiece can be adjusted by adjusting the front and rear relative positions of the tensioning part and the adjusting part. The adjustment is convenient and reliable, and the force for fixing the workpiece can be accurately adjusted to avoid deformation of the workpiece caused by excessive force or slipping of the workpiece caused by insufficient force. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of a transmission wheel of an automobile engine according to an embodiment of the present invention, with an enlarged diagram of the front and rear surfaces before and after the flash removal; Figure 2 A three-dimensional diagram of a positioning assembly according to an embodiment of the present invention; Figure 3 An exploded view of the positioning components of an embodiment of the present invention; Figure 4 A cross-sectional view of a positioning assembly according to an embodiment of the present invention; Figure 5 A three-dimensional diagram of a fixing assembly according to an embodiment of the present invention; Figure 6 This is an exploded view of a fixing assembly according to an embodiment of the present invention; Figure 7 It is a cross-sectional view of a fixing assembly according to an embodiment of the present invention; Figures 8 to 13 This is a schematic diagram of the working process of the feeding positioning and fixing device according to an embodiment of the present invention, wherein Fig. 9 , Fig.10 , Fig.11 The corresponding fixing components are located at the first position, the second position and the third position respectively. Fig.12 As shown, at this time, the compression spring is compressed due to the movement of the fixing seat, but the elastic member is not compressed. Fig.13 As shown, the workpiece is now clamped and fixed.

[0019] Description of reference numerals: 10-workpiece, 11-flash, 20- Positioning assembly, 21-positioning sleeve, 211-positioning surface, 212-guide block, 22-elastic chuck, 221-elastic clamping claw, 222-guide ramp, 30-Fixed components, 31-tensioner, 311-cone, 312-arc groove, 313-locking bolt, 32- elastic member, 33-clamping piece, 331-clamping surface, 332-positioning pressure plate, 333-positioning ring, 334-compression spring, 34-adjusting part, 341-limiting convex edge, 35-fixed seat, 351-mounting slot, 352-fixed plate, 36-Elastic ring. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] It should be noted that in the present invention, the terms "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element of the present invention must have a specific orientation, and therefore cannot be understood as a limitation on the present invention. Example

[0022] Cooperate Figures 1 to 13 As shown, the present invention discloses a feeding, positioning and fixing device, which is used for feeding, positioning and fixing an annular workpiece 10. After the workpiece 10 is fixed, the workpiece 10 can be processed. Figure 1 The automobile engine transmission wheel is shown as an example of a workpiece 10 to be processed. After the workpiece 10 is fixed, the flash 11 can be removed or other operations can be performed on it. Of course, the device of the present application can also be used for feeding, positioning and fixing other suitable workpieces, which is not limited here.

[0023] Cooperate Figures 2 to 13 As shown, a feeding positioning and fixing device comprises: The positioning assembly 20 includes a positioning sleeve 21 and an elastic chuck 22. The front end of the positioning sleeve 21 is provided with a positioning surface 211 that matches with the rear end of the workpiece 10. The elastic chuck 22 is provided at the front end of the positioning sleeve 21. The fixing assembly 30 includes a tensioning member 31 adapted to the elastic clamp 22, an elastic member 32 and a clamping member 33 arranged at the rear side of the tensioning member 31. The tensioning member 31 moves from front to rear along the elastic clamp 22 to expand the elastic clamp 22 outward. The rear end of the clamping member 33 has a clamping surface 331 matched with the front end surface of the workpiece 10. A driving member (not shown in the figure), connected to the fixing assembly 30, driving the fixing assembly 30 to reciprocate in the front-rear direction; The driving member drives the fixing assembly 30 to move from front to back, and the fixing assembly 30 moves to the first position. At this time, the tensioning member 31 extends into the interior of the workpiece 10, and the fixing assembly 30 continues to move backward and drives the workpiece 10 to synchronously reach the second position. At this time, the rear end of the workpiece 10 surrounds the outer periphery of the elastic clamp 22 and the rear end face of the workpiece 10 is positioned and fits with the positioning surface 211 of the positioning sleeve 21. The fixing assembly 30 continues to move backward so that the tensioning member 31 drives the elastic clamp 22 to slowly expand outward to press the inner wall of the workpiece 10, and at the same time, the clamping surface 331 of the clamping member 33 fits the front end face of the clamped workpiece 10.

[0024] Cooperate Figures 2 to 4 As shown, the positioning sleeve 21 is connected to the main shaft of the machine tool, and the main shaft of the machine tool can drive the positioning sleeve 21 and the elastic chuck 22 to rotate (to remove the flash 11 of the workpiece 10); the fixing assembly 30 is connected and fixed to the driving member, and the driving member drives the fixing assembly 30 to reciprocate in the front and rear directions to complete the feeding (sending to the positioning assembly 20 for fixing), positioning and fixing of the workpiece 10. The positioning assembly 20 and the fixing assembly 30 are located on the same axis extending front and back, and on both sides of them, there are respectively provided a loading mechanism and a unloading mechanism (not shown in the figure) of the workpiece 10. The loading mechanism sends the workpiece 10 to be processed between the fixing assembly 30 and the positioning assembly 20, so that the fixing assembly 30 and the positioning assembly 20 can position and fix it, and then the workpiece 10 can be processed (remove the flash 11); the unloading mechanism removes the processed workpiece 10 and sends it to the next process. Among them, the driving member is preferably a cylinder, and the piston rod of the cylinder is connected and fixed to the front end of the fixing assembly 30.

[0025] During operation, the driving member drives the fixing assembly 30 to move from front to back (moving in the direction close to the positioning assembly 20). When the fixing assembly 30 reaches the first position, it can then drive the workpiece 10 to move together to complete 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 fits with the positioning surface 211 of the positioning sleeve 21, completing the automatic positioning of the workpiece 10; then the fixing assembly 30 continues to move toward the rear side relative to the workpiece 10 until the workpiece 10 is pressed and fixed. Through the device of the present application, automatic feeding, positioning and fixing of the workpiece 10 are realized, and positioning is first performed and then clamping is performed, so the positioning is reliable and damage to the workpiece 10 caused by skewed positioning is avoided.

[0026] The elastic chuck 22 includes a plurality of elastic jaws 221, and the inner side surface of the elastic jaws 221 is a guide bevel 222 that cooperates with the tensioner 31. Specifically, the guide bevel 222 is inclined from front to back toward the center of the elastic chuck 22, and correspondingly, the outer peripheral surface of the front end of the tensioner 31 is a conical surface 311 that cooperates with the guide bevel 222. When the tensioner 31 moves from front to back along the elastic chuck 22, the conical surface 311 of the tensioner 31 corresponds to the guide bevel 222, driving each elastic jaw 221 to expand outward until the outer side 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).

[0027] The positioning surface 211 is annular, and a plurality of guide blocks 212 are arranged along the positioning surface 211. The elastic chuck 22 is fixed to the front end of the positioning sleeve 21, and the elastic clamping claws 221 are embedded in the gaps between the guide blocks 212 one by one. The positioning surface 211 is located at the front end of the positioning sleeve 21 and is annular. The front end outer side surface of the guide block 212 is a conical surface 311, which is convenient for the workpiece 10 to be sleeved on the outer periphery of the guide block 212 (elastic clamping claw 221). Specifically, the guide blocks 212 are evenly arranged along the circumferential direction of the positioning surface 211. The elastic clamping jaws 221 are evenly arranged along the circumferential direction of the elastic chuck 22. The elastic clamping jaws 221 are correspondingly embedded in the middle of the front end surface of the positioning sleeve 21 and are locked and fixed with the positioning sleeve 21 by bolts. At the same time, the elastic clamping jaws 221 are just embedded in the gaps between the guide blocks 212 one by one. 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 clamping jaws 221, that is, the workpiece 10 is firstly sleeved on the outer periphery of the guide block 212, and then on the outer periphery of the elastic clamping jaws 221, and the guide block 212 and the inner wall gap of the workpiece 10 are matched.

[0028] Cooperate Figures 5 to 7As shown, the fixing assembly 30 further 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 clamping jaw 221, the elastic member 32 provides a pressing 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 to the position where the workpiece 10 is clamped and fixed (in this state, the relative position of the tensioning member 31 and the elastic clamping jaw 221 is fixed), the deformation amount of the elastic member 32 will also change, so that the pressing force of the tensioning member 31 on the elastic clamping jaw 221 can be changed, that is, the pressing force for fixing the workpiece 10 can be changed. By simply adjusting the front and rear positions of the tensioning member 31 and the adjusting member 34, the clamping force of the fixed workpiece 10 can be adjusted. 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 accurately adjusted to avoid the clamping force being too large to cause deformation of the inner hole or too small to cause the workpiece 10 to slip.

[0029] The specific cooperation of 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 is threadedly matched with the adjusting member 34. An arc groove 312 is provided along the outer periphery of the tensioning member 31, and a locking bolt 313 is provided corresponding to the arc groove 312. The adjusting member 34 is provided with an external thread, and the tensioning member 31 is provided with an internal thread matched therewith. The tensioning member 31 is rotated to move forward and backward relative to the adjusting member 34, so that the front and rear position between the tensioning member 31 and the adjusting member 34 can be adjusted. Furthermore, the tensioning member 31 is annular, and an arc groove 312 is provided along its outer periphery, and a locking bolt 313 is provided corresponding to the arc 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, thereby avoiding inaccurate clamping force at the tensioning member 31 in the future.

[0030] The fixing assembly 30 also includes a fixing seat 35, which is connected and fixed to the driving member. A mounting groove 351 is provided at the rear end of the fixing seat 35, and the elastic member 32 is installed in the mounting groove 351. One end of the adjusting member 34 is located in the mounting groove 351 and abuts against the elastic member 32, and the other end extends out of the mounting groove 351 and is connected to the tensioning member 31. The front end of the fixing seat 35 is connected and fixed to the piston rod of the cylinder (driving member). The elastic member 32 is installed in the mounting groove 351, and one end thereof abuts against the bottom of the mounting groove 351, and the other end abuts against the front end of the adjusting member 34. Specifically, the elastic member 32 is a disc spring, and a limiting convex edge 341 is provided at the rear end of the adjusting member 34. A fixing plate 352 is provided at the notch of the mounting groove 351, and the fixing plate 352 limits the limiting convex edge 341 from being separated from the mounting groove 351. The fixing plate 352 is annular in shape, 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, thereby preventing the adjusting member 34 from separating from the fixing seat 35.

[0031] The fixing assembly 30 further includes an outwardly protruding elastic ring 36, and the outer periphery of the elastic ring 36 is adapted to the inner wall of the workpiece 10. When the fixing assembly 30 reaches the first position, the elastic ring 36 is in close contact with the inner wall of the workpiece 10. The elastic ring 36 is elastic, and the elastic ring 36 cooperates with the inner wall of the workpiece 10 to drive the workpiece 10 to move with the fixing assembly 30, which can effectively prevent the inner wall of the workpiece 10 from being scratched. Specifically, the elastic ring 36 is an O-ring, which is arranged on the outer periphery of the fixing seat 35 and protrudes from the outer peripheral surface of the fixing seat 35 by 0.1-0.3 mm.

[0032] The clamping member 33 is arranged at the front end of the fixing seat 35. Specifically, the clamping member 33 includes a rear end face of the positioning ring 333 to form the clamping surface 331, the positioning pressure plate 332 is connected and fixed to the fixing seat 35, and a compression spring 334 is arranged between the positioning pressure plate 332 and the positioning ring 333. The positioning pressure plate 332 and the positioning ring 333 are both annular and sleeved on the front end of the fixing seat 35. The positioning pressure plate is locked and fixed to the fixing seat 35 by bolts, and a plurality of compression springs 334 are arranged between the positioning pressure plate 332 and the positioning ring 333, and the compression spring 334 provides a clamping force for the clamping surface 331 to clamp the front end face of the workpiece 10.

[0033] When the fixing assembly 30 is in the second position, the rear end face of the workpiece 10 is positioned and fit with the positioning face 211, and then the fixing assembly 30 continues to move backward relative to the workpiece 10 until the fixing assembly 30 reaches the third position, at which time the clamping face 331 just fits with the front end face of the workpiece 10, and then the fixing assembly 30 continues to move backward, the positioning pressure plate 332 moves relative to the positioning ring 333, and the compression spring 334 is compressed to provide a clamping force to the clamping face 331 of the positioning ring 333, and then the elastic member 32 provides an elastic force to cause the tensioning member 31 to drive the elastic clamping claw 221 to expand outward. When the tensioning member 31 moves into place, the clamping force of the tensioning member 31 on the inner wall of the workpiece 10 and the clamping force of the clamping face 331 on the end face of the workpiece 10 are exactly the preset forces, so that the fixing force on the workpiece 10 is appropriate, and the workpiece 10 will neither be deformed nor slipped. By adjusting the position of the tensioning member 31 , the clamping force of the clamping surface 331 on the end surface of the workpiece 10 can also be adjusted.

[0034] 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 fixing assembly 30 and the positioning assembly 20), the driving member drives the fixing assembly 30 to move from front to back, and when the fixing assembly 30 moves to the first position, the cooperating Fig. 9 As shown, at this time, the tensioning member 31 extends into the interior of the workpiece 10, and the elastic ring 36 is compressed and closely attached to the inner wall of the workpiece 10; The fixing assembly 30 continues to move backward, and the fixing assembly 30 drives the workpiece 10 to move synchronously. When the fixing assembly 30 reaches the second position, the fixing assembly 30 cooperates with the workpiece 10 to move synchronously. Fig.10 As shown, at this time, the rear end of the workpiece 10 surrounds the outer periphery of the elastic clamp 221 and the guide block 212, and at the same time, the rear end surface 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 backward, and the workpiece 10 stops moving under the action of the positioning surface 211. When the fixing assembly 30 reaches the third position, the workpiece 10 is engaged with the fixing surface 211. Fig.11 As shown, at this time, the clamping surface 331 just fits the front end surface of the workpiece 10, the tensioning member 31 extends into the elastic clamping claw 221, and the conical surface 311 of the tensioning member 31 just fits with the guiding inclined surface 222; The fixing assembly 30 continues to move backward, and the positioning plate 332 moves relative to the positioning ring 333. Figure 12 to Figure 13As shown, the compression spring 334 is compressed to provide a clamping force to the clamping surface 331 of the positioning ring 333, and then the conical surface 311 of the tensioner 31 cooperates with the guide slope 222 and moves along the guide slope 222. The elastic member 32 provides elastic force to make the tensioner 31 drive the elastic clamping claw 221 to expand outward. When the tensioner 31 moves into place, the elastic chuck 22 just presses 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, the flash 11 of the workpiece 10 can be removed in cooperation with the processing. After the workpiece 10 is processed, the unloading mechanism completes the unloading and sends it to the next process.

[0035] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A feeding positioning and fixing device, characterized in that: Used for feeding, positioning and fixing of annular workpieces, including: The positioning assembly 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, comprising a tensioning member adapted to the elastic chuck, an elastic member and a clamping member arranged at the rear side of the tensioning member, wherein the tensioning member moves from front to rear along the elastic chuck to expand the elastic chuck outward, and the rear end of the clamping member has a clamping surface matched with the front end surface of the workpiece; A driving member connected to the fixing assembly to drive the fixing assembly to reciprocate in a front-rear direction; The driving member drives the fixing assembly to move from front to back, and the fixing assembly moves to the first position. At this time, the tensioning member extends into the interior of the workpiece, and the fixing assembly continues to move backward and drives the workpiece to synchronously 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 fits with the positioning surface of the positioning sleeve. The fixing assembly continues to move backward so that the tensioning member drives the elastic chuck to slowly expand outward to press the inner wall of the workpiece, and at the same time, the clamping surface of the clamping member fits with the front end face of the clamped workpiece.

2. A feeding positioning and fixing device as claimed in claim 1, characterized in that: The fixing assembly 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-rear position between the tensioning member and the adjusting member is adjustable.

3. A feeding positioning and fixing device as claimed in claim 2, characterized in that: The tensioning piece is sleeved on the outer periphery of the adjusting piece, and the tensioning piece is threadedly matched with the adjusting piece. An arc groove is arranged along the outer periphery of the tensioning piece, and a locking bolt is arranged corresponding to the arc groove.

4. A feeding positioning and fixing device as claimed in claim 2 or 3, characterized in that: The fixing assembly also includes a fixing seat, which is connected and fixed to the driving member. A mounting groove is provided at the rear end of the fixing seat, 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, and the other end extends out of the mounting groove and is connected to the tensioning member.

5. A feeding positioning and fixing device as claimed in claim 4, characterized in that: The elastic member is a disc spring, a limiting convex edge is provided at the rear end of the adjusting member, a fixing plate is provided at the notch of the mounting groove, and the fixing plate limits the limiting convex edge from being separated from the mounting groove.

6. A feeding positioning and fixing device as claimed in claim 1, characterized in that: The fixing assembly also includes a fixing seat, the fixing seat is connected and fixed to the driving member, and the clamping member is arranged at the front end of the fixing seat.

7. A feeding positioning and fixing device as claimed in claim 6, characterized in that: The clamping member includes a positioning pressure plate and a positioning ring arranged at the rear side of the positioning pressure plate, the rear end surface of the positioning ring forms the clamping surface, the positioning pressure plate is connected and fixed to the fixing seat, and a compression spring is arranged between the positioning pressure plate and the positioning ring.

8. A feeding positioning and fixing device as claimed in claim 1, characterized in that: The elastic clamp includes a plurality of elastic clamping claws, and the inner side surfaces of the elastic clamping claws are guiding inclined surfaces matched with the tensioning member.

9. A feeding positioning and fixing device as claimed in claim 8, characterized in that: The positioning surface is annular, and a plurality of guide blocks are arranged along the positioning surface. The elastic clamp is fixed to 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. A feeding positioning and fixing device as claimed in claim 1, characterized in that: The fixing assembly further comprises an outwardly convex elastic ring, and the outer periphery of the elastic ring is adapted to the inner wall of the workpiece. When the fixing assembly reaches the first position, the elastic ring is in close contact with the inner wall of the workpiece.

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