Mechanical expansion head replacement equipment and mechanical expansion head

Abstract

The invention relates to the technical field of mechanical expansion heads, in particular to mechanical expansion head replacement equipment and a mechanical expansion head. The mechanical expansion head replacement equipment comprises a base body, a fixing frame is fixedly connected to the top of the base body, a connecting disc is fixedly connected to the top of the fixing frame, and a connecting assembly is arranged on the outer side of the connecting disc; compared with an existing mechanical expansion head, the mechanical expansion head can adapt to the sizes of containing grooves of expansion head bodies of different specifications, special connecting pieces do not need to be replaced, the whole process is driven by a motor, manual adjustment is not needed, the labor cost is reduced, the displacement precision is guaranteed through mechanical transmission, manual operation errors are avoided, and the production efficiency is improved. The device can adapt to the sizes of containing grooves of expansion head bodies of different specifications, special connecting pieces do not need to be replaced, the whole process is driven by a motor, manual adjustment is not needed, labor cost is reduced, displacement precision is guaranteed through mechanical transmission, and manual operation errors are avoided.

Description

Technical Field

[0001] This invention relates to the field of mechanical expansion head technology, specifically to a mechanical expansion head replacement device and a mechanical expansion head. Background Technology

[0002] In the field of mechanical manufacturing, mechanical expansion heads, as core components for positioning, clamping, and assembling pipes and cylindrical parts, are widely used in industries such as automobile manufacturing, pipe processing, and aerospace for pipe connections, bearing installation, and the processing of housing parts. Their core function is to achieve a tight fit with the inner or outer wall of the part through radial expansion or contraction, ensuring stable coaxiality and positional accuracy during processing and assembly, directly impacting the processing quality and product qualification rate of subsequent processes.

[0003] However, existing mechanical expansion heads and their replacement equipment have gradually revealed several technical shortcomings in practical applications, making it difficult to meet the demands of modern production for high efficiency, precision, and flexibility. The connecting components of existing replacement equipment are mostly designed with fixed specifications. For mechanical expansion heads of different diameters and lengths, corresponding chucks, clamps, and other dedicated connecting parts must be replaced, increasing equipment procurement costs and spare parts inventory pressure, as well as prolonging changeover time. This makes it difficult to adapt to the flexible production needs of multi-variety, small-batch production. During expansion head installation, manual adjustment of positioning references, tightening of bolts, or calibration of coaxiality is often required. This is not only labor-intensive and inefficient but also prone to fluctuations in installation accuracy due to differences in operator experience. For example, when manually calibrating coaxiality, relying solely on visual observation or simple measuring tools cannot guarantee micron-level positioning accuracy, further restricting the stability of overall processing quality. Therefore, improving existing expansion head replacement equipment and designing a new type of mechanical expansion head replacement equipment and mechanical expansion head to solve the above-mentioned technical shortcomings and improve the overall practicality of the expansion head replacement equipment is particularly important. Summary of the Invention

[0004] The purpose of this invention is to provide a mechanical expansion head replacement device and a mechanical expansion head, which solves the problem that the connecting parts of existing replacement devices are mostly designed with fixed specifications. For mechanical expansion heads of different diameters and lengths, corresponding chucks, clamps and other special connecting parts need to be replaced. This not only increases the equipment procurement cost and spare parts inventory pressure, but also prolongs the changeover time, making it difficult to adapt to the flexible production needs of multiple varieties and small batches.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A mechanical expansion head replacement device includes a base body, a fixing frame fixedly connected to the top of the base body, a connecting plate fixedly connected to the top of the fixing frame, a connecting component provided on the outer side of the connecting plate, and a conveying component provided on the top of the base body.

[0007] The connecting assembly includes a fixed shell fixedly connected to the outside of the connecting disk, a connecting frame fixedly connected inside the fixed shell, a rotating disk rotatably connected inside the connecting frame, limit blocks slidably connected around the inside of the fixed shell and outside the rotating disk, a connecting shell fixedly connected to the outside of the fixed shell, a connecting column fixedly connected inside the connecting shell, limit plates rotatably connected around the front end of the connecting column, and a moving ring slidably connected to the outside of the connecting column.

[0008] As a preferred embodiment of the present invention, the rotating disk is rotatably connected to connecting rods on all four sides, the connecting rods are rotatably connected to the limiting block, and the connecting rods are designed with an arc-shaped structure.

[0009] As a preferred embodiment of the present invention, a drive rod is fixedly connected to the rear end of the rotating disk, a worm gear is fixedly connected to the rear end of the drive rod, a worm is meshed with the outer side of the worm gear, and the worm extends to the outer side of the fixed shell and is fixedly connected to the drive end of the first drive motor.

[0010] As a preferred embodiment of the present invention, a first driving screw is rotatably connected inside the connecting column, the first driving screw is fixedly connected to the rotating disk, and multiple sets of connecting grooves are opened on the outer side of the connecting column. The moving ring is connected to the first driving screw through the connecting grooves, and the moving ring is threadedly connected to the first driving screw.

[0011] As a preferred embodiment of the present invention, rotating frames are rotatably connected to all four sides of the movable ring, and the end of the rotating frame away from the movable ring is rotatably connected to the limiting plate.

[0012] As a preferred embodiment of the present invention, a guide groove is provided inside the fixed shell and outside the multiple sets of limiting blocks. The limiting blocks are slidably connected to the guide grooves. Two sets of friction blocks are slidably connected to the limiting blocks extending to the outside of the fixed shell. A first compression spring is fixedly connected to the friction blocks extending to the inside of the limiting blocks.

[0013] As a preferred embodiment of the present invention, the conveying assembly includes a fixed frame fixedly connected to the top of the base body, a plurality of placement plates fixedly connected to the top of the fixed frame, a connecting frame fixedly connected to the outside of the fixed frame, a movable frame slidably connected to the outside of the connecting frame, a first hydraulic cylinder fixedly connected to the outside of the movable frame, a connecting seat fixedly connected to the driving end of the first hydraulic cylinder, and two sets of grippers provided at the bottom of the connecting seat.

[0014] As a preferred embodiment of the present invention, a second hydraulic cylinder is fixedly connected to the top of the connecting seat, the driving end of the second hydraulic cylinder is fixedly connected to two sets of grippers, a second driving screw is rotatably connected inside the connecting frame, the driving end of a second driving motor is fixedly connected to the outer side of the connecting frame through the second driving screw, and the moving frame is threadedly connected to the second driving screw.

[0015] The present invention also provides a mechanical expansion head, including an expansion head body, a movable sleeve slidably connected to the rear end of the expansion head body, a receiving groove being provided inside the movable sleeve, and limit grooves being provided around the inside of the receiving groove, and the movable sleeve having a conical structure design.

[0016] As a preferred embodiment of the present invention, the internal structure size of the limiting groove is designed to correspond to the external structure size of the limiting block. The movable sleeve extends to the inside of the expansion head body and is fixedly connected to a second compression spring. The outer side of the expansion head body is slidably connected to a bonding block. The bonding block extends to the outer side of the expansion head body and is fixedly connected to a rubber block. The surface of the rubber block is designed with a toothed structure. Sliding grooves are opened on the outer side of the expansion head body and on the outer side of multiple sets of bonding blocks. The bonding block is slidably connected to the sliding groove.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. In this invention, through the design of the connecting components, after the first drive motor starts, it drives the worm to rotate. The worm meshes with the worm wheel at the rear end, transmitting power to the rotating disk, causing the rotating disk to rotate within the connecting frame. The rotating disk is rotatably connected to the limiting block through an arc-shaped connecting rod around its perimeter. When the rotating disk rotates, the connecting rod makes an arc-shaped movement around the rotating disk as the center, pulling or pushing the limiting block to slide radially along the guide groove inside the fixed shell. When the movable sleeve of the expansion head body is fitted into the fixed shell, the limiting block can be precisely inserted into the limiting groove, initially fixing the expansion head. At the same time as the rotating disk rotates, the first drive screw fixed at its front end rotates synchronously. The movable ring is threadedly connected to the first drive screw through the connecting groove. When the screw rotates, it drives the movable ring to slide axially along the connecting column. The rotating frame around the movable ring is connected to the limiting plate, and the movable ring position... The limiting plate is rotated around the connecting column as the center, and finally the limiting plate fits against the inner wall of the receiving groove, forming a two-way fixation of the limiting block and the limiting plate. Two sets of friction blocks are slidably connected to the outside of the limiting block. The first compression spring on the inside of the friction block can push the friction block to fit against the inner wall of the limiting groove, further enhancing the friction and preventing the expansion head body from loosening. Through the double fixation of the radial limiting block and the axial limiting plate, the problem of easy displacement and loosening of the traditional connection method is solved. The expansion head body does not shake after installation. The radial displacement of the limiting block and the rotation angle of the limiting plate can be precisely controlled by the motor, which can adapt to the receiving groove size of different specifications of expansion head bodies. There is no need to replace the special connecting parts. The whole process is driven by the motor, and there is no need for manual adjustment, which reduces labor costs. The displacement accuracy is guaranteed by mechanical transmission, avoiding human operation error.

[0019] 2. In this invention, through the design of the conveying component, after the second drive motor starts, it drives the second drive screw inside the connecting frame to rotate. The moving frame is threadedly connected to the second drive screw. When the screw rotates, it drives the moving frame to slide longitudinally along the connecting frame, which can move the gripper above different placement plates. The first hydraulic cylinder drive end on the outside of the moving frame is fixed to the connecting seat, which can push the connecting seat to move laterally and adjust the horizontal alignment of the gripper and the expansion head body. The multiple placement plates at the top of the fixed frame are arc-shaped, which can adapt to the shape of the expansion head body and avoid displacement during storage. It provides a precise positioning benchmark for gripper gripping. There is no need for manual handling of the expansion head body. The gripping, conveying and installation process can be completed automatically. It is especially suitable for scenarios where multiple specifications of expansion heads are frequently changed, which greatly shortens the replacement time.

[0020] 3. In this invention, through the design of the expanding head body, a conical movable sleeve is slidably connected to the rear end of the expanding head body. The second compression spring inside the movable sleeve maintains its initial position. When the steel pipe is inserted into the outer side of the expanding head body, it pushes the steel pipe to move towards the expanding head body. The steel pipe drives the expanding head body to move, causing the movable sleeve to contact the fitting block on the outer side of the expanding head body. The movable sleeve has a conical structure. When the expanding head body continues to move, the conical surface squeezes the fitting block, pushing the fitting block to slide radially outward along the sliding groove on the outer side of the expanding head body. Multiple sets of fitting blocks expand synchronously. Finally, it comes into close contact with the inner wall of the steel pipe. A toothed rubber block is fixed to the outside of the bonding block. The toothed structure of the rubber block can enhance the friction with the inner wall of the steel pipe. At the same time, the rubber material has a certain degree of elasticity, which can adapt to the slight unevenness of the inner wall of the steel pipe and prevent the steel pipe from sliding. Multiple sets of bonding blocks expand simultaneously, forming multiple points of uniform contact with the inner wall of the steel pipe. This solves the problem of easy deformation under single-point force in traditional supports. The rubber block material is soft and will not scratch the inner wall of the steel pipe when it is bonded. At the same time, the toothed structure enhances the friction while avoiding excessive compression that could cause the steel pipe to deform. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the connection component structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the fixed shell structure of the present invention;

[0024] Figure 4 This is a schematic diagram of the connecting frame structure of the present invention;

[0025] Figure 5 This is a schematic diagram of the connecting column structure of the present invention;

[0026] Figure 6 This is a schematic diagram of the friction block structure of the present invention;

[0027] Figure 7 This is a schematic diagram of the main structure of the expansion head of the present invention;

[0028] Figure 8 This is a schematic diagram of the bonding block structure of the present invention;

[0029] Figure 9 This is a schematic diagram of the sliding groove structure of the present invention.

[0030] In the diagram: 1. Base body; 2. Fixing frame; 3. Connecting plate; 4. Connecting assembly; 5. Conveying assembly; 6. Fixing shell; 7. Connecting frame; 8. Rotating plate; 9. Limiting block; 10. Connecting shell; 11. Connecting column; 12. Limiting plate; 13. Moving ring; 14. Connecting rod; 15. Drive rod; 16. Worm gear; 17. Worm; 18. First drive motor; 19. First drive screw; 20. Connecting groove; 21. Rotating frame; 22. Guide groove; 3. Friction block; 24. First compression spring; 25. Fixing frame; 26. Placement plate; 27. Connecting frame; 28. Moving frame; 29. ​​First hydraulic cylinder; 30. Connecting seat; 31. Gripper; 32. Second hydraulic cylinder; 33. Second drive screw; 34. Second drive motor; 35. Expansion head body; 36. Moving sleeve; 37. Receiving groove; 38. Limiting groove; 39. Second compression spring; 40. Adhesive block; 41. Rubber block; 42. Sliding groove. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] Example:

[0033] Please see Figures 1-9 The present invention provides a technical solution:

[0034] A mechanical expansion head replacement device includes a base body 1, a fixing frame 2 fixedly connected to the top of the base body 1, a connecting plate 3 fixedly connected to the top of the fixing frame 2, a connecting component 4 provided on the outer side of the connecting plate 3, and a conveying component 5 provided on the top of the base body 1.

[0035] The connecting assembly 4 includes a fixed shell 6 fixedly connected to the outside of the connecting disk 3. A connecting frame 7 is fixedly connected inside the fixed shell 6. A rotating disk 8 is rotatably connected inside the connecting frame 7. Limiting blocks 9 are slidably connected to the four sides inside the fixed shell 6 and outside the rotating disk 8. A connecting shell 10 is fixedly connected to the outside of the fixed shell 6. A connecting post 11 is fixedly connected inside the connecting shell 10. Limiting plates 12 are rotatably connected to the four sides of the front end of the connecting post 11. A moving ring 13 is slidably connected to the outside of the connecting post 11.

[0036] Furthermore, connecting rods 14 are rotatably connected to all four sides of the rotating disk 8. The connecting rods 14 are rotatably connected to the limiting blocks 9. The connecting rods 14 have an arc-shaped structure design. A drive rod 15 is fixedly connected to the rear end of the rotating disk 8. A worm gear 16 is fixedly connected to the rear end of the drive rod 15. A worm 17 is meshed with the outer side of the worm gear 16. The worm 17 extends to the outer side of the fixed shell 6 and is fixedly connected to the drive end of the first drive motor 18. The connecting rods 14 are rotatably connected to the limiting blocks 9. When the connecting rods 14 are displaced, they can pull or push the limiting blocks 9 to move. The first drive motor 18 is started. The drive end of the first drive motor 18 drives the worm 17 to rotate, which in turn drives the drive rod 15 to rotate, thereby causing the rotating disk 8 to rotate. This causes multiple sets of connecting rods 14 to move in an arc shape with the rotating disk 8 as the center, allowing multiple sets of limiting blocks 9 to move.

[0037] The connecting column 11 is rotatably connected to a first driving screw 19, which is fixedly connected to the rotating disk 8. Multiple connecting grooves 20 are formed on the outer side of the connecting column 11. The moving ring 13 is connected to the first driving screw 19 through the connecting grooves 20 and is threadedly connected to the first driving screw 19. Rotating frames 21 are rotatably connected around the moving ring 13. The end of the rotating frame 21 away from the moving ring 13 is rotatably connected to the limiting plate 12. When the rotating disk 8 rotates, the first driving screw 19 is fixedly connected to the rotating disk 8, causing the first driving screw 19 to rotate. The moving ring 13 is connected to the first driving screw 19 through the connecting grooves 20. When the first driving screw 19 rotates, the moving ring 13 is displaced, which drives the multiple sets of rotating frames 21 to move. The rotating frames 21 enable the multiple sets of limiting plates 12 to move in an arc shape with the connecting column 11 as the center.

[0038] Secondly, guide grooves 22 are provided inside the fixed shell 6 and on the outside of the multiple sets of limiting blocks 9. The limiting blocks 9 are slidably connected to the guide grooves 22. Two sets of friction blocks 23 are slidably connected to the outer side of the fixed shell 6. The friction blocks 23 are fixedly connected to the inside of the limiting blocks 9 by a first compression spring 24, which slidably connects the limiting blocks 9 to the guide grooves 22. When the limiting blocks 9 are displaced, the guide grooves 22 can guide them, allowing the limiting blocks 9 to move. The two sets of friction blocks 23 can increase the friction on the surface of the limiting blocks 9. The first compression spring 24 can drive the friction blocks 23 to move, allowing the friction blocks 23 to move to the outside of the limiting blocks 9.

[0039] Furthermore, the conveying assembly 5 includes a fixed frame 25 fixedly connected to the top of the base body 1. Multiple placement plates 26 are fixedly connected to the top of the fixed frame 25. A connecting frame 27 is fixedly connected to the outer side of the fixed frame 25. A movable frame 28 is slidably connected to the outer side of the connecting frame 27. A first hydraulic cylinder 29 is fixedly connected to the outer side of the movable frame 28. A connecting seat 30 is fixedly connected to the drive end of the first hydraulic cylinder 29. Two sets of grippers 31 are provided at the bottom of the connecting seat 30. A second hydraulic cylinder 32 is fixedly connected to the top of the connecting seat 30. The drive end of the second hydraulic cylinder 32 is fixedly connected to the two sets of grippers 31. The connecting frame 27 is rotatably connected to a second drive screw 33. The second drive screw 33 extends to the outside of the connecting frame 27 and is fixedly connected to the drive end of a second drive motor 34. The moving frame 28 is threadedly connected to the second drive screw 33. The second drive motor 34 is started to drive the second drive screw 33 to rotate, so that the moving frame 28 can move longitudinally. The first hydraulic cylinder 29 is started to drive the connecting seat 30 to move, so that the gripper 31 can move laterally. The second hydraulic cylinder 32 is started, and the drive end of the second hydraulic cylinder 32 can drive the gripper 31 to move vertically.

[0040] This embodiment also provides a mechanical expansion head, including the mechanical expansion head replacement device provided in any of the above embodiments. Because it possesses all the technical features of the mechanical expansion head replacement device provided in any of the above embodiments, it has the same technical effect as the above-mentioned mechanical expansion head replacement device. It also includes an expansion head body 35, with a movable sleeve 36 slidably connected to the rear end of the expansion head body 35. The movable sleeve 36 has an internal receiving groove 37, and limit grooves 38 are formed around the perimeter of the receiving groove 37. The internal size of the limit grooves 38 corresponds to the external size of the limit block 9. A second compression spring 39 is fixedly connected to the interior of the movable sleeve 36 extending into the expansion head body 35. A bonding block 40 is slidably connected to the outer side of the expansion head body 35. A rubber block 41 is fixedly connected to the outer side of the bonding block 40 extending into the outer side of the expansion head body 35. The surface of the rubber block 41 has a toothed structure design. Sliding grooves 42 are formed on the outer side of the expansion head body 35 and on the outer side of multiple sets of bonding blocks 40. The bonding blocks 40 are slidably connected to the sliding grooves 42. The 6-shaped conical structure allows the movable sleeve 36 to contact the connecting plate 3, enabling the fixed shell 6 to move into the receiving groove 37. The limiting block 9 is then inserted into the limiting groove 38. The first compression spring 24 drives the friction block 23 to move, bringing it into contact with the inner wall of the limiting groove 38. This increases the stability of the connection between the limiting block 9 and the limiting groove 38. When installing a steel pipe, the pipe is inserted into the outside of the expansion head body 35, and the displaced steel pipe drives the expansion head body 35 to move. The movement causes the movable sleeve 36 to contact the multiple sets of bonding blocks 40. The continuous displacement of the expansion head body 35 causes the movable sleeve 36 to squeeze the bonding blocks 40, driving the multiple sets of bonding blocks 40 to move outwards and contact the inner wall of the steel pipe. The friction between the multiple sets of rubber blocks 41 and the steel pipe is increased, which enables stable installation of the steel pipe. The bonding blocks 40 are slidably connected to the sliding groove 42. When the bonding blocks 40 are displaced, the stability of the displacement of the bonding blocks 40 is increased, preventing deviation.

[0041] In this embodiment, the specific implementation scenario is as follows: In actual use, multiple sets of expansion head bodies 35 are placed on top of the placement plate 26. The top of the placement plate 26 has an arc-shaped structure design, which allows for the installation of the expansion head bodies 35. The expansion head body 35 of the corresponding specification is selected according to the specifications of the steel pipe. The second drive motor 34 is started to drive the second drive screw 33 to rotate, so that the moving frame 28 can be moved longitudinally. The moving frame 28 is moved to the designated position. The first hydraulic cylinder 29 is started to drive the connecting seat 30 to move, so that the gripper 31 can be moved laterally. The gripper 31 is moved above the corresponding expansion head body 35. The second hydraulic cylinder 32 is started, and the gripper can be driven by the drive end of the second hydraulic cylinder 32. 31. Vertical displacement is performed, bringing the gripper 31 into contact with the expansion head body 35. The two sets of grippers 31 can clamp the expansion head body 35, moving it to the outside of the connecting plate 3, allowing the fixed shell 6 to move into the receiving groove 37. The first drive motor 18 is started, driving the worm gear 17 to rotate, causing the worm to rotate, which in turn drives the drive rod 15 to rotate, thus causing the rotating plate 8 to rotate. This causes multiple sets of connecting rods 14 to move in an arc with the rotating plate 8 as the center, allowing multiple sets of limiting blocks 9 to move. The limiting blocks 9 are inserted into the limiting groove 38, and the first compression spring 24 drives the friction block 23 to move, causing the friction block 23 to move. 3. Contact with the inner wall of the limiting groove 38, thereby increasing the stability of the connection between the limiting block 9 and the limiting groove 38. When the rotating disk 8 rotates, the first driving screw 19 is fixedly connected to the rotating disk 8, causing the first driving screw 19 to rotate. The moving ring 13 is connected to the first driving screw 19 through the connecting groove 20. When the first driving screw 19 rotates, the moving ring 13 is displaced, driving multiple sets of rotating frames 21 to move. Through the rotating frames 21, multiple sets of limiting plates 12 can move in an arc shape with the connecting column 11 as the center, bringing the limiting plate 12 into contact with the inner wall of the receiving groove 37, increasing the stability of the connection between the fixed shell 6 and the receiving groove 37, thereby enabling the installation of the expansion head body 35. When it is necessary to install the steel pipe... During installation, the steel pipe is inserted into the outside of the expansion head body 35. The displacement steel pipe drives the expansion head body 35 to move, causing the moving sleeve 36 to contact multiple sets of bonding blocks 40. The continuous displacement of the expansion head body 35 causes the moving sleeve 36 to squeeze the bonding blocks 40, driving the multiple sets of bonding blocks 40 to move outward of the expansion head body 35 and contact the inner wall of the steel pipe. Multiple sets of rubber blocks 41 increase the friction with the steel pipe, enabling stable installation of the steel pipe. The bonding blocks 40 are slidably connected to the sliding groove 42. When the bonding blocks 40 are displaced, the stability of the displacement of the bonding blocks 40 is increased, preventing deviation. Compared with existing mechanical expansion heads, this invention improves the overall practicality of mechanical expansion heads through design.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mechanical bull changing apparatus comprising a base body (1), characterized in that: The top of the base body (1) is fixedly connected with a fixing frame (2), the top of the fixing frame (2) is fixedly connected with a connecting disc (3), the outer side of the connecting disc (3) is provided with a connecting assembly (4), and the top of the base body (1) is provided with a conveying assembly (5); The connecting assembly (4) comprises a fixed shell (6) fixedly connected to the outer side of the connecting disc (3), a connecting frame (7) fixedly connected to the inside of the fixed shell (6), a rotating disc (8) rotatably connected to the inside of the connecting frame (7), a plurality of limiting blocks (9) slidably connected to the periphery of the inside of the fixed shell (6) and located at the outer side of the rotating disc (8), a connecting shell (10) fixedly connected to the outer side of the fixed shell (6), a connecting column (11) fixedly connected to the inside of the connecting shell (10), a plurality of limiting plates (12) rotatably connected to the periphery of the front end of the connecting column (11), and a moving ring (13) slidably connected to the outer side of the connecting column (11).

2. A mechanical bullhead changer according to claim 1, characterized in that: The rotating disc (8) is rotatably connected with a connecting rod (14) around the periphery thereof, the connecting rod (14) is rotatably connected with the limiting block (9), and the connecting rod (14) is designed in an arc shape.

3. A mechanical bullhead changer according to claim 1, characterized in that: The rear end of the rotating disc (8) is fixedly connected with a driving rod (15), the rear end of the driving rod (15) is fixedly connected with a worm wheel (16), the outer side of the worm wheel (16) is meshingly connected with a worm (17), and the worm (17) extends to the outer side of the fixed shell (6) and is fixedly connected with the driving end of a first driving motor (18).

4. A mechanical bullhead changer according to claim 1, characterized in that: The inside of the connecting column (11) is rotatably connected with a first driving screw (19), the first driving screw (19) is fixedly connected with the rotating disc (8), a plurality of connecting grooves (20) are formed in the outer side of the connecting column (11), the moving ring (13) is connected with the first driving screw (19) through the connecting grooves (20), and the moving ring (13) is threadedly connected with the first driving screw (19).

5. A mechanical bullhead changer according to claim 1, characterized in that: The moving ring (13) is rotatably connected with a rotating frame (21) around the periphery thereof, and the end, away from the moving ring (13), of the rotating frame (21) is rotatably connected with the limiting plate (12).

6. A mechanical bullhead changer according to claim 1, characterized in that: The inside of the fixed shell (6) and located at the outer side of the plurality of limiting blocks (9) are provided with guide grooves (22), the limiting blocks (9) are slidably connected with the guide grooves (22), the limiting blocks (9) extend to the outer side of the fixed shell (6) and are slidably connected with two groups of friction blocks (23), and the friction blocks (23) extend to the inside of the limiting blocks (9) and are fixedly connected with first compression springs (24).

7. A mechanical bullhead changer according to claim 1, characterized in that: The conveying assembly (5) comprises a fixed frame (25) fixedly connected to the top of the base body (1), a plurality of placing plates (26) fixedly connected to the top of the fixed frame (25), a connecting frame (27) fixedly connected to the outer side of the fixed frame (25), a moving frame (28) slidably connected to the outer side of the connecting frame (27), a first hydraulic oil cylinder (29) fixedly connected to the outer side of the moving frame (28), a connecting seat (30) fixedly connected to the driving end of the first hydraulic oil cylinder (29), and two groups of clamping jaws (31) provided at the bottom of the connecting seat (30).

8. A mechanical bullhead changer according to claim 7, characterised in that: The top of the connecting seat (30) is fixedly connected with a second hydraulic oil cylinder (32), the driving end of the second hydraulic oil cylinder (32) is fixedly connected with two groups of clamping jaws (31), the inside of the connecting frame (27) is rotatably connected with a second driving screw (33), the second driving screw (33) extending to the outside of the connecting frame (27) is fixedly connected with the driving end of a second driving motor (34), and the moving frame (28) is threadedly connected with the second driving screw (33).

9. A mechanical expansion head characterized by, The mechanical rising head comprises the mechanical rising head replacing device and a rising head body (35), the rear end of the rising head body (35) is slidably connected with a moving sleeve (36), the inside of the moving sleeve (36) is provided with an accommodating groove (37), the periphery of the inside of the accommodating groove (37) is provided with a limiting groove (38), and the moving sleeve (36) is designed in a conical structure.

10. A mechanical bull nose according to claim 9, wherein: The inside structure size of the limiting groove (38) is designed in correspondence with the outside structure size of the limiting block (9), the inside of the moving sleeve (36) extending to the rising head body (35) is fixedly connected with a second compression spring (39), the outside of the rising head body (35) is slidably connected with a matching block (40), the outside of the rising head body (35) extending to the outside of the matching block (40) is fixedly connected with a rubber block (41), the surface of the rubber block (41) is designed in a toothed structure, the outside of the rising head body (35) and outside of the matching block (40) are provided with a sliding groove (42), and the matching block (40) is slidably connected with the sliding groove (42).

Images