Workpiece rotation driving device for workpiece surface groove machining equipment

Abstract

The invention discloses a workpiece rotation driving device for workpiece surface groove processing equipment, comprising: a clamping mechanism comprising a frame, a rotating base rotatably mounted on the bottom side of the frame, and a lifting base mounted on the upper side of the frame in a liftable manner; the covering type inner hole limiting assembly comprises a fixed barrel fixedly connected to the bottom side of the lifting base, a plurality of arc-shaped blocking and pushing plates are movably arranged on the periphery of the fixed barrel, an arc-shaped jacking plate is movably arranged between every two adjacent arc-shaped blocking and pushing plates, and the arc-shaped blocking and pushing plates and the arc-shaped jacking plates are each fixedly connected with a set of corresponding connecting rod pieces; the limiting driving mechanism comprises a driving shaft, sliding rods are obliquely and fixedly connected between the connecting rod pieces, and a plurality of inverted-T-shaped grooves used for being connected with the sliding rods in a sliding mode are formed in the outer side face of the driving shaft. According to the invention, the overall clamping effect of the workpiece can be effectively ensured, and the deformation of the workpiece mounting hole caused by spinning machining can be reduced.

Description

Technical Field

[0001] The invention relates to a workpiece rotation driving device for workpiece surface groove processing equipment, which is mainly used to fix a cylindrical workpiece and rotationally drive it, so as to cooperate with a rotary wheel mechanism to process a groove body on the surface of the workpiece. Background Art

[0002] Existing workpieces, such as pulleys, often need to be grooved on the surface of a blank with a mounting hole in the middle by corresponding workpiece surface groove processing equipment. The existing workpiece surface groove processing equipment generally includes a workpiece rotation driving device for rotating the blank workpiece and a spinning wheel mechanism for performing groove spinning processing on the surface of the workpiece.

[0003] Most of the existing workpiece rotating drive devices for workpiece surface groove processing equipment include a rotating base rotatably mounted on the bottom side of the frame, and a lifting seat that can be lifted and lowered on the upper side of the frame. The lifting seat is driven downward by a lifting cylinder to fix and clamp the rough workpiece between the lifting seat and the rotating base in a longitudinally rotatable manner, and then the rotating base or the lifting seat is driven to rotate by a corresponding synchronous driving mechanism. Since the middle part of the rough workpiece is provided with a mounting hole, during the process of longitudinal rotation clamping, if the clamping force is low, the rough workpiece will be easily offset during the spinning process, and a production accident will occur in severe cases; if the clamping force is high, it is easy to cause mechanical damage to the clamping end of the rough workpiece; there is another problem in the actual use of the existing workpiece rotating drive device for workpiece surface groove processing equipment: when the surface groove body of the rough workpiece is subjected to spinning processing, since the rough workpiece with the mounting hole is often lacking sufficient support, the mounting hole of the workpiece after the processing is often significantly deformed, resulting in waste, which is very troublesome.

[0004] Therefore, the purpose of the present invention is to design a workpiece rotation drive device for workpiece surface groove processing equipment that can synchronously form a complete circular tube support surface at the mounting hole of the workpiece during the rotatable fixed clamping process of the workpiece, thereby effectively ensuring the overall clamping effect of the workpiece; and can reduce the deformation problem of the workpiece mounting hole caused by the spinning process. Summary of the invention

[0005] In view of the technical problems existing in the above-mentioned prior art, the present invention provides a workpiece rotation driving device for workpiece surface groove processing equipment, which can effectively solve the technical problems existing in the above-mentioned prior art.

[0006] The technical solution of the present invention is: A workpiece rotation driving device for a workpiece surface groove processing device, comprising: The clamping mechanism comprises a frame, a rotating base rotatably mounted on the bottom side of the frame, and a lifting seat movably mounted on the upper side of the frame, wherein the lifting seat is driven by a corresponding lifting cylinder, and the rotating base and the lifting seat are synchronously driven by a corresponding synchronous driving mechanism; A covering inner hole limit assembly comprises a fixed cylinder fixedly connected to the bottom side of the lifting seat, a plurality of corresponding arc-shaped push plates are movably arranged at equal intervals on the periphery of the fixed cylinder, corresponding arc-shaped top tightening plates are movably arranged between two adjacent arc-shaped push plates, the arc-shaped top tightening plates are located on the inner sides of the two adjacent arc-shaped push plates and are arranged at intervals with the arc-shaped push plates, a group of corresponding connecting rods are respectively fixedly connected inwardly according to the height of the arc-shaped push plates and the arc-shaped top tightening plates, and the connecting rods are respectively movably inserted into the inner side of the fixed cylinder; The limit drive mechanism comprises a driving shaft movably inserted in the fixed cylinder, the top of the driving shaft is fixedly connected to the bottom side of the lifting seat by a coil spring, and a group of the connecting rods are respectively fixedly connected with corresponding sliding rods in an inverted T shape, the inclination angle of the sliding rod connected to the arc-shaped top clamping plate is greater than the inclination angle of the sliding rod connected to the arc-shaped push plate, and the outer side surface of the driving shaft is provided with a plurality of inverted T-shaped grooves for slidingly connecting the sliding rods; when the lifting seat moves down to the position to clamp the workpiece between the lifting seat and the rotating base, the arc-shaped push plate and the arc-shaped top clamping plate are driven by the inverted T-shaped grooves on the driving shaft to move outwards respectively, and form a complete circular tube surface that is pressed against the inner hole wall of the workpiece.

[0007] The two sides of the arc-shaped push-blocking plate are respectively provided with corresponding abutting inclined surfaces inclined inwardly, and the two sides of the arc-shaped tightening plate are respectively provided with tightening inclined surfaces adapted to the abutting inclined surfaces.

[0008] The arc-shaped push plate, the arc-shaped pressing plate, and the bottom of the driving shaft respectively extend to the lower side of the bottom end portion of the fixed cylinder; a plurality of fixed blocks located on the inner side of the arc-shaped pressing plate are arranged at intervals on the rotating base; corresponding swing rods are swingably mounted on the fixed blocks; when the lifting seat is lowered into position to fix and clamp the workpiece between the lifting seat and the rotating base, the bottom end portion of the fixed cylinder presses down the inner end portion of the swing rod, so that the outer end portion of the swing rod is fixedly pressed against the bottom side of the inner side wall of the arc-shaped pressing plate.

[0009] The outer ends of the swing rods are respectively fixed with arc-shaped rods abutting against the lower side of the arc-shaped top tightening plate.

[0010] The top ends of the arc-shaped push-blocking plate and the arc-shaped tightening plate are respectively in an inverted L-shape and outwardly fixed with corresponding buffer pressing plates, and the buffer pressing plates are made of rubber material.

[0011] The middle part of the lifting seat is integrally formed with a mounting truncated platform for connecting the fixed cylinder, and the outer edge of the mounting truncated platform is located on the outer side of the fixed cylinder. The lifting seat is pressed downward on the upper side of the buffer pressure plate, so that the buffer pressure plate is fixed between the lifting seat and the top end of the workpiece in an extruded state, and the outer edge of the mounting truncated platform forms a travel limit for the inner side of the buffer pressure plate after extrusion and deformation.

[0012] After the lifting seat moves down to the position to press the workpiece, the bottom ends of the arc-shaped push plate and the arc-shaped pressing plate are spaced from the rotating base.

[0013] A circle of corresponding guide protrusions is arranged inwardly on the bottom side of the fixed cylinder, and the driving shaft can be movably inserted in the guiding protrusions, and the upper side of the driving shaft is arranged at a distance from the fixed cylinder.

[0014] The middle part of the rotating base is integrally formed with a blocking and pushing circular table which is used to block and push the driving shaft upward, and the fixed blocks are respectively arranged on the rotating base outside the blocking and pushing circular table.

[0015] The synchronous driving mechanism adopts a group of corresponding synchronous motors, and the rotating base and the lifting base are respectively connected to the output shaft ends of the group of synchronous motors through belt transmission.

[0016] Advantages of the present invention: 1) The present invention is additionally provided with a covering inner hole limit assembly, which includes a fixed cylinder fixedly connected to the bottom side of the lifting seat, and a plurality of corresponding arc-shaped push plates are movably arranged at equal intervals on the periphery of the fixed cylinder, and corresponding arc-shaped top tightening plates are movably arranged between two adjacent arc-shaped push plates, and the arc-shaped top tightening plates are located on the inner sides of the two adjacent arc-shaped push plates and are arranged at intervals with the arc-shaped push plates; the sliding rod is effectively installed by a group of connecting rods fixedly connected to the arc-shaped push plates and the arc-shaped top tightening plates according to height, and the inclination angle of the sliding rod connected to the arc-shaped top tightening plate is set to be greater than the inclination angle of the sliding rod connected to the arc-shaped push plate. In this way, under the driving of the inverted T-shaped grooves of different inclination angles of the driving shaft of the limit drive mechanism, the arc-shaped push plate and the arc-shaped top plate can be pushed outward at different speeds at the same time, and the moving speed of the arc-shaped top plate is greater than that of the arc-shaped push plate, so that when the lifting seat moves down to the position to clamp the workpiece between the lifting seat and the rotating base, the arc-shaped push plate and the arc-shaped top plate are pushed outward to the position synchronously, so that the arc-shaped push plate and the arc-shaped top plate form a complete round tube support surface at the installation hole of the workpiece. Thereby effectively ensuring the overall clamping effect of the workpiece and reducing the deformation of the workpiece installation hole caused by the spinning process.

[0017] 2) The two sides of the arc-shaped push-block plate of the present invention are respectively inclined inwardly and provided with corresponding abutting inclined surfaces, and the two sides of the arc-shaped top clamping plate are respectively provided with top clamping inclined surfaces adapted to the abutting inclined surfaces. When the arc-shaped push-block plate cooperates with the arc-shaped top clamping plate to form a complete round tube support surface inside the mounting hole of the workpiece, part of the force on the arc-shaped push-block plate can be evenly and obliquely transferred to the arc-shaped top clamping plate, thereby improving the force dispersion effect during the spinning process and improving the structural stability between the arc-shaped push-block plate and the arc-shaped top clamping plate during the force process.

[0018] 3) Since inverted T-shaped grooves with different inclination angles need to be set on the driving shaft to drive the sliding rod installed on the arc-shaped push plate and the arc-shaped top clamping plate, due to the travel limitation between the components, the connecting rod and the sliding rod cannot be set at the bottom of the arc-shaped push plate and the arc-shaped top clamping plate, resulting in the bottom of the circular tube support surface formed by the arc-shaped push plate and the arc-shaped top clamping plate to ensure necessary support. To this end, the present invention further arranges a plurality of fixed blocks located on the inner side of the arc-shaped top clamping plate at intervals on the rotating base, and corresponding swing rods are swingably installed on the fixed blocks. When the lifting base moves down into position to fix and clamp the workpiece between the lifting base and the rotating base, the bottom end of the fixed cylinder presses down on the inner end of the swing rod, so that the outer end of the swing rod is fixedly pressed to the bottom side of the inner side wall of the arc-shaped top clamping plate, thereby effectively forming a reinforced support for the bottom side of each arc-shaped top clamping plate. In addition, part of the force of the arc-shaped push plate can be evenly and obliquely transferred to the arc-shaped top clamping plate. Therefore, the support stability of the bottom of the circular tube support surface formed by the arc-shaped push plate and the arc-shaped top clamping plate can be effectively ensured.

[0019] 4) The top ends of the arc-shaped push plate and the arc-shaped top clamping plate of the present invention are respectively in an inverted L-shape and fixedly connected outwardly with corresponding buffer pressure plates, and the middle part of the lifting seat is integrally formed with a mounting truncated table downwardly provided for connecting to the fixed cylinder, and the outer edge of the mounting truncated table is located on the outer side of the fixed cylinder. When the lifting seat is pressed against the upper side of the buffer pressure plate when it moves downward, the outer edge of the mounting truncated table forms a travel limit for the inner side of the buffer pressure plate after the compression deformation, so as to ensure that the buffer pressure plate can be more stably fixed in an extruded state between the lifting seat and the top end of the workpiece, so as to help improve the clamping effect of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention.

[0021] Figure 2 It is a structural schematic diagram of a covering inner hole limit assembly.

[0022] Figure 3 It is a front view of the covering inner hole limit assembly.

[0023] Figure 4 It is a cross-sectional view of the covering inner hole limit assembly.

[0024] Figure 5 This is an exploded view of the parts of the covered inner hole limit assembly.

[0025] Figure 6 This is a diagram of the use status of the covering inner hole limit component when fixing the workpiece.

[0026] Figure 7 This is a diagram showing the use status of the present invention on a workpiece surface groove processing device.

[0027] In the accompanying drawings: clamping mechanism 1, frame 101, rotating base 102, lifting seat 103, lifting cylinder 2, covering inner hole limit assembly 3, fixed cylinder 301, arc-shaped push plate 302, arc-shaped top tightening plate 303, connecting rod 304, slide rod 305, limit drive mechanism 4, drive shaft 401, spiral spring 402, inverted T-slot 5, workpiece 6, fixed block 7, swing rod 8, arc-shaped rod 9, buffer pressure plate 10, mounting round table 11, guide convex edge 12, push round table 13, synchronous motor 14. DETAILED DESCRIPTION

[0028] In order to facilitate understanding by those skilled in the art, the structure of the present invention is further described in detail with reference to the embodiments in conjunction with the accompanying drawings: refer to Figure 1-7 , a workpiece rotating driving device for a workpiece surface groove processing device, comprising: The clamping mechanism 1 comprises a frame 101, a rotating base 102 rotatably mounted on the bottom side of the frame 101, and a lifting seat 103 movably mounted on the upper side of the frame 101, wherein the lifting seat 103 is driven by a corresponding lifting cylinder 2; after the workpiece 6 is mounted on the upper side of the rotating base 102, the lifting cylinder 2 drives the lifting seat 103 downward to rotatably clamp the workpiece 6 between the lifting seat 103 and the rotating base 102, and the rotating base 102 and the lifting seat 103 are synchronously driven by a corresponding synchronous driving mechanism; The covering inner hole limiting component 3 comprises a fixed cylinder 301 fixedly connected to the bottom side of the lifting seat 103, a plurality of corresponding arc-shaped push plates 302 are movably arranged at equal intervals on the periphery of the fixed cylinder 301, and corresponding arc-shaped top tightening plates 303 are movably arranged between two adjacent arc-shaped push plates 302, the arc-shaped top tightening plates 303 are located on the inner sides of the two adjacent arc-shaped push plates 302 and are arranged at intervals with the arc-shaped push plates 302, and a group of corresponding connecting rods 304 are respectively fixedly connected inwardly according to the height of the arc-shaped push plates 302 and the arc-shaped top tightening plates 303, and the connecting rods 304 are respectively movably inserted into the inner side of the fixed cylinder 301; The limit drive mechanism 4 includes a drive shaft 401 which is movably inserted into the fixed cylinder 301, and the top of the drive shaft 401 is fixedly connected to the bottom side of the lifting seat 103 by a coil spring 402. A group of the connecting rods 304 are respectively fixedly connected with corresponding sliding rods 305 in an inverted T shape. The inclination angle of the sliding rod 305 connected to the arc-shaped clamping plate 303 is greater than the inclination angle of the sliding rod 305 connected to the arc-shaped push plate 302. The outer side surface of the drive shaft 401 is provided with a plurality of inverted T-shaped grooves 5 for slidingly connecting the sliding rods 305. When the lifting seat 103 moves down to its position to clamp the workpiece 6 between the lifting seat 103 and the rotating base 102, the arc-shaped push plate 302 and the arc-shaped clamping plate 303 are driven by the inverted T-shaped grooves 5 on the drive shaft 401 and move outward respectively, and form a complete circular tube surface that is tightened on the inner hole wall of the workpiece 6.

[0029] The present invention is additionally provided with a covering inner hole limit assembly 3, which includes a fixed cylinder 301 fixedly connected to the bottom side of the lifting seat 103, and a plurality of corresponding arc-shaped push plates 302 are movably arranged at equal intervals on the periphery of the fixed cylinder 301, and corresponding arc-shaped top tightening plates 303 are movably arranged between two adjacent arc-shaped push plates 302, and the arc-shaped top tightening plates 303 are located on the inner sides of the two adjacent arc-shaped push plates 302 and are arranged at intervals with the arc-shaped push plates 302; the sliding rod 305 is effectively installed by a group of connecting rods 304 fixedly connected to the arc-shaped push plates 302 and the arc-shaped top tightening plates 303 according to their height, and the inclination angle of the sliding rod 305 connected to the arc-shaped top tightening plates 303 is set to be greater than the inclination angle of the sliding rod 305 connected to the arc-shaped push plates 302. In this way, under the driving of the inverted T-shaped groove 5 with different inclination angles of the driving shaft 401 of the limit driving mechanism 4, the arc-shaped push plate 302 and the arc-shaped top plate 303 can be pushed outward at different speeds at the same time, and the moving speed of the arc-shaped top plate 303 is greater than that of the arc-shaped push plate 302, so that when the lifting seat 103 moves down to the position to clamp the workpiece 6 between the lifting seat 103 and the rotating base 102, the arc-shaped push plate 302 and the arc-shaped top plate 303 are pushed outward to the position synchronously, so that the arc-shaped push plate 302 and the arc-shaped top plate 303 form a complete round tube support surface at the installation hole of the workpiece 6. Thereby, on the basis of effectively reducing the clamping force on the upper and lower ends of the workpiece 6, the overall clamping effect of the workpiece 6 is effectively ensured, and the deformation of the workpiece installation hole caused by the spinning process can be reduced.

[0030] The two sides of the arc-shaped push-blocking plate 302 are respectively provided with corresponding abutting inclined surfaces inclined inwardly, and the two sides of the arc-shaped tightening plate 303 are respectively provided with tightening inclined surfaces adapted to the abutting inclined surfaces.

[0031] When the arc-shaped push plate 302 cooperates with the arc-shaped clamping plate 303 to form a complete circular tube support surface on the inner side of the mounting hole of the workpiece 6, part of the force on the arc-shaped push plate 302 can be evenly and obliquely transferred to the arc-shaped clamping plate 303, thereby improving the force dispersion effect during the spinning process and improving the structural stability between the arc-shaped push plate 302 and the arc-shaped clamping plate 303 during the force process.

[0032] The arc-shaped push plate 302, the arc-shaped top plate 303, and the bottom of the driving shaft 401 extend to the lower side of the bottom end of the fixed cylinder 301, and the rotating base 102 is provided with a plurality of fixed blocks 7 located inside the arc-shaped top plate 303 at intervals, and the fixed blocks 7 are swingably mounted with corresponding swing rods 8. When the lifting seat 103 moves downward to the position to fix and clamp the workpiece 6 between the lifting seat 103 and the rotating base 102, the bottom end of the fixed cylinder 301 presses down on the inner end of the swing rod 8, so that the outer end of the swing rod 8 is fixedly pressed against the bottom side of the inner side wall of the arc-shaped top plate 303. The outer ends of the swing rods 8 are respectively fixedly connected with arc-shaped rods 9 abutting against the lower side of the arc-shaped top plate 303.

[0033] Since an inverted T-shaped groove 5 with different inclination angles needs to be set on the driving shaft 401 to drive the sliding rod 305 installed on the arc-shaped push plate 302 and the arc-shaped top clamping plate 303, due to the travel limitation between the components, the connecting rod 304 and the sliding rod 305 cannot be set at the bottom of the arc-shaped push plate 302 and the arc-shaped top clamping plate 303, so that the bottom of the circular tube support surface formed by the arc-shaped push plate 302 and the arc-shaped top clamping plate 303 ensures the necessary support. To this end, the present invention further arranges a plurality of fixed blocks 7 located on the inner side of the arc-shaped clamping plate 303 at intervals on the rotating base 102, and corresponding swing rods 8 are swingably installed on the fixed blocks 7. When the lifting base 103 moves down to the position to fix and clamp the workpiece 6 between the lifting base 103 and the rotating base 102, the bottom end of the fixed cylinder 301 presses down on the inner end of the swing rod 8, so that the outer end of the swing rod 8 is fixedly pressed to the bottom side of the inner wall of the arc-shaped clamping plate 303, thereby effectively forming a reinforced support for the bottom side of each arc-shaped clamping plate 303. In addition, part of the force on the arc-shaped push plate 302 can be evenly and obliquely transferred to the arc-shaped clamping plate 303. Therefore, the support stability of the bottom of the circular tube support surface formed by the arc-shaped push plate 302 and the arc-shaped clamping plate 303 can be effectively ensured.

[0034] The top ends of the arc-shaped push-blocking plate 302 and the arc-shaped pressing plate 303 are respectively in an inverted L-shape and outwardly fixed with corresponding buffer pressing plates 10, and the buffer pressing plates 10 are made of rubber material.

[0035] The middle part of the lifting seat 103 is integrally formed with a mounting truncated platform 11 for connecting to the fixed cylinder 301, and the outer edge of the mounting truncated platform 11 is located on the outer side of the fixed cylinder 301. The lifting seat 103 is pressed downward on the upper side of the buffer pressure plate 10, so that the buffer pressure plate 10 is fixed between the lifting seat 103 and the top end of the workpiece 6 in an extruded state, and the outer edge of the mounting truncated platform 11 forms a travel limit for the inner side of the buffer pressure plate 10 after extrusion and deformation.

[0036] The top ends of the arc-shaped push plate 302 and the arc-shaped clamping plate 303 of the present invention are respectively in an inverted L-shape and are fixedly connected to the corresponding buffer pressure plate 10 outward, and the middle part of the lifting seat 103 is integrally formed with a mounting table 11 downwardly provided for connecting to the fixed cylinder 301, and the outer edge of the mounting table 11 is located on the outer side of the fixed cylinder 301. When the lifting seat 103 is pressed downward on the upper side of the buffer pressure plate 10, the outer edge of the mounting table 11 forms a travel limit for the inner side of the buffer pressure plate 10 after extrusion and deformation, so as to ensure that the buffer pressure plate 10 can be more stably fixed in an extruded state between the lifting seat 103 and the top end of the workpiece 6, so as to help improve the clamping effect of the workpiece 6.

[0037] After the lifting seat 103 moves downward to the position to press the workpiece 6 , the bottom ends of the arc-shaped push plate 302 and the arc-shaped pressing plate 303 are spaced apart from the rotating base 102 .

[0038] A circle of corresponding guide protrusions 12 is provided inwardly on the bottom side of the fixed cylinder 301 , and the driving shaft 401 can be movably inserted into the guiding protrusions 12 , and the upper side of the driving shaft 401 is spaced apart from the fixed cylinder 301 .

[0039] The middle part of the rotating base 102 is integrally formed with a blocking and pushing circular platform 13 for blocking and pushing the driving shaft 401 , and the fixing blocks 7 are respectively arranged on the rotating base 102 outside the blocking and pushing circular platform 13 .

[0040] The synchronous driving mechanism adopts a group of corresponding synchronous motors 14, and the rotating base 102 and the lifting base 103 are respectively connected to the output shaft ends of the group of synchronous motors 14 through belt transmission.

[0041] The hydraulic system of the lifting cylinder 2 in this embodiment is equipped with a pressure sensor, which can directly measure the pressure changes inside the lifting cylinder 2, so that the pushing thrust of the lifting cylinder 2 can be controlled within a set range, and then the tightening effect of the arc-shaped push plate 302 and the arc-shaped tightening plate 303 can be controlled. Slight assembly errors between components can be adapted through the deformation of the buffer pressure plate 10.

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A workpiece rotation drive device for workpiece surface groove processing equipment, characterized in that: include: The clamping mechanism (1) comprises a frame (101), a rotating base (102) rotatably mounted on the bottom side of the frame (101), and a lifting seat (103) movably mounted on the top side of the frame (101), wherein the lifting seat (103) is driven by a corresponding lifting cylinder (2), and the rotating base (102) and the lifting seat (103) are synchronously driven by a corresponding synchronous driving mechanism; A covering inner hole limiting assembly (3) comprises a fixed cylinder (301) fixedly connected to the bottom side of the lifting seat (103), a plurality of corresponding arc-shaped push plates (302) are movably arranged at equal intervals on the periphery of the fixed cylinder (301), corresponding arc-shaped top tightening plates (303) are movably arranged between two adjacent arc-shaped push plates (302), the arc-shaped top tightening plates (303) are located on the inner sides of the two adjacent arc-shaped push plates (302) and are arranged at intervals with the arc-shaped push plates (302), a group of corresponding connecting rods (304) are respectively fixedly connected inwardly on the arc-shaped push plates (302) and the arc-shaped top tightening plates (303) according to their height, and the connecting rods (304) are respectively movably inserted into the inner side of the fixed cylinder (301); The limit drive mechanism (4) comprises a drive shaft (401) movably inserted into the fixed cylinder (301), the top of the drive shaft (401) is fixedly connected to the bottom side of the lifting seat (103) through a coil spring (402), and a group of connecting rods (304) are respectively fixedly connected with corresponding sliding rods (305) in an inverted T shape, and the inclination angle of the sliding rod (305) connected to the arc-shaped top tightening plate (303) is greater than that of the sliding rod (305) connected to the arc-shaped push plate (302). The outer side surface of the driving shaft (401) is provided with a plurality of inverted T-shaped grooves (5) for slidably connecting the sliding rod (305); when the lifting seat (103) moves down to a position to clamp the workpiece (6) between the lifting seat (103) and the rotating base (102), the arc-shaped push plate (302) and the arc-shaped pressing plate (303) are respectively moved outwards under the drive of the inverted T-shaped grooves (5) on the driving shaft (401) to form a complete circular tube surface pressed against the inner hole wall of the workpiece (6).

2. The workpiece rotation driving device for workpiece surface groove processing equipment according to claim 1, characterized in that: The two sides of the arc-shaped push-blocking plate (302) are respectively provided with corresponding abutment inclined surfaces inclined inwardly, and the two sides of the arc-shaped tightening plate (303) are respectively provided with tightening inclined surfaces adapted to the abutment inclined surfaces.

3. The workpiece rotation driving device for workpiece surface groove processing equipment according to claim 2, characterized in that: The arc-shaped push plate (302), the arc-shaped pressing plate (303), and the bottom of the driving shaft (401) respectively extend to the lower side of the bottom end of the fixed cylinder (301); a plurality of fixed blocks (7) located inside the arc-shaped pressing plate (303) are arranged on the rotating base (102) at intervals; corresponding swing rods (8) are swingably mounted on the fixed blocks (7); when the lifting seat (103) moves down to a position to fix and clamp the workpiece (6) between the lifting seat (103) and the rotating base (102), the bottom end of the fixed cylinder (301) presses down on the inner end of the swing rod (8), so that the outer end of the swing rod (8) is fixedly pressed against the bottom side of the inner wall of the arc-shaped pressing plate (303).

4. The workpiece rotation driving device for workpiece surface groove processing equipment according to claim 3, characterized in that: The outer ends of the swing rods (8) are respectively fixedly connected with arc-shaped rod members (9) that abut against the lower side of the arc-shaped pressing plate (303).

5. The workpiece rotation driving device for workpiece surface groove processing equipment according to claim 1, characterized in that: The top ends of the arc-shaped push-blocking plate (302) and the arc-shaped tightening plate (303) are respectively in an inverted L-shape and are outwardly fixedly connected to corresponding buffer pressing plates (10), and the buffer pressing plates (10) are made of rubber material.

6. The workpiece rotation driving device for workpiece surface groove processing equipment according to claim 5, characterized in that: The middle part of the lifting seat (103) is integrally formed with a mounting truncated platform (11) for connecting to the fixed cylinder (301). The outer edge of the mounting truncated platform (11) is located on the outside of the fixed cylinder (301). The lifting seat (103) is pressed downward against the upper side of the buffer pressure plate (10), so that the buffer pressure plate (10) is fixed between the lifting seat (103) and the top end of the workpiece (6) in an extruded state. The outer edge of the mounting truncated platform (11) forms a travel limit for the inner side of the buffer pressure plate (10) after extrusion and deformation.

7. The workpiece rotation driving device for workpiece surface groove processing equipment according to claim 6, characterized in that: After the lifting seat (103) moves downward to a position to press the workpiece (6), the bottom ends of the arc-shaped push plate (302) and the arc-shaped pressing plate (303) are spaced from the rotating base (102).

8. The workpiece rotation driving device for workpiece surface groove processing equipment according to claim 1, characterized in that: A circle of corresponding guide protrusions (12) is arranged inwardly on the bottom side of the fixed cylinder (301), and the drive shaft (401) is movably inserted into the guide protrusion (12). The upper side of the drive shaft (401) is arranged at a distance from the fixed cylinder (301).

9. The workpiece rotation driving device for workpiece surface groove processing equipment according to claim 3, characterized in that: The middle part of the rotating base (102) is integrally formed with a push-blocking circular platform (13) which is used to push the driving shaft (401) upwards, and the fixed blocks (7) are respectively arranged on the rotating base (102) outside the push-blocking circular platform (13).

10. The workpiece rotation driving device for workpiece surface groove processing equipment according to claim 1, characterized in that: The synchronous drive mechanism adopts a group of corresponding synchronous motors (14), and the rotating base (102) and the lifting base (103) are respectively connected to the output shaft ends of the group of synchronous motors (14) through belt transmission.

Images