A tube expander with a threaded sleeve and spring washer

Abstract

This technical solution belongs to the field of pipe expander technology, specifically relating to a pipe expander with a threaded sleeve and spring washer, including a housing, a locking device, and a pipe expanding mechanism. The housing has an installation cavity and a pipe expanding cavity. The pipe expanding mechanism is disposed in the installation cavity. The pipe cone assembly includes an eccentric cone and an eccentric base, with the eccentric cone located in the pipe expanding cavity. The worm gear assembly includes a worm gear box and a worm gear seat that rotates relative to the worm gear box. The inner side of the worm gear seat is provided with a guide groove corresponding to the travel direction of the eccentric cone. The transmission assembly includes a transmission pin, a transmission screw, and a threaded sleeve and spring washer defined in the guide groove. The transmission pin coaxially fixes the eccentric base and the transmission screw. The connecting sleeve is installed in the connection through a limiting member. The drive assembly drives the worm gear seat to rotate. The worm gear seat drives the eccentric base and the transmission screw to rotate coaxially through the transmission pin. The limiting member restricts the rotation of the threaded sleeve and spring washer, so that the transmission screw drives the eccentric cone to move back and forth through the connection part. The elastic force of the elastic washer pushes the connection part, so that the eccentric cone has a tendency to push out and slide.

Description

Technical Field

[0001] This technical solution relates to the field of expander technology, specifically to a expander with a threaded sleeve and spring washer. Background Technology

[0002] An electric pipe expander is a power tool that applies radial force to the end of a pipe (such as a metal or plastic pipe) by rotating the expanding head, causing it to undergo uniform plastic deformation to increase its diameter and facilitate pipe connection. It features high efficiency, precision, and labor-saving operation, and can be adapted to different pipe diameters.

[0003] For example, Chinese patent CN118543753A discloses an electric tube expander, including a housing. An outer bushing and a worm gear box are fixed inside the housing. The worm gear box is equipped with a propulsion device for driving an eccentric seat to move toward a clamping device. The propulsion device includes a screw, a nut, and an elastic body. The elastic body is sleeved on the outside of the nut, with one end of the elastic body abutting against the end of the nut and the other end abutting against the inner wall of the worm gear box. The motor drives the worm to rotate, which in turn drives the worm gear body to rotate, thereby driving the screw to rotate. This causes the screw and the eccentric seat to move closer to the product to the left, while the nut moves to the right to squeeze the elastic body. When the elastic body deforms, the eccentric seat moves slowly, and the torque on the eccentric seat is greater, resulting in a better tube expanding effect.

[0004] The elastomers in the aforementioned electric pipe expanders often use return springs, elastic rubber blocks, or spring sleeves to provide elastic support, buffering, and reset functions. However, they are prone to wear during repeated operation. When maintaining or replacing the elastomer, the integrated design of the elastomer with nested fit requires disassembling the internal components of the worm gear box, and then recalibrating the fit accuracy of the transmission components. This results in complex maintenance, low replacement efficiency, and inconvenient use. Summary of the Invention

[0005] This technical solution aims to improve the problem of complex maintenance and disassembly and cumbersome use caused by the nested integrated design of the elastomer in electric expanders, by providing an expander with a threaded sleeve and spring washer.

[0006] The purpose of this technical solution is achieved as follows:

[0007] A tube expander with a threaded sleeve and spring washer includes a housing, a locking device, and a tube expanding mechanism. The housing has a mounting cavity, and the tube expanding mechanism is disposed within the mounting cavity for tube expanding. The tube expanding mechanism includes:

[0008] A conical tube assembly, comprising an eccentric conical tube and an eccentric base, wherein the housing further comprises a tube expanding cavity, and the conical end of the eccentric conical tube is located within the tube expanding cavity;

[0009] A worm gear assembly includes a worm gear seat and a worm gear box. The worm gear box is fixedly connected to a housing. The worm gear seat is rotatably disposed relative to the worm gear box. A guide groove is formed on the inner side of the worm gear seat corresponding to the traveling direction of the eccentric cone.

[0010] A transmission assembly includes a transmission pin, a transmission screw, and a threaded sleeve washer. The transmission pin coaxially fixes the eccentric base and the transmission screw. The ends of the transmission pin are all limited in the guide groove. The front end of the transmission screw is connected to the eccentric base, and the rear end of the transmission screw is connected to the threaded sleeve washer. The threaded sleeve washer is limited to axial movement within the worm gear box by a limiting member.

[0011] The threaded sleeve and elastic washer include a connecting threaded sleeve and an elastic washer ring. The worm gear box is provided with a connecting hole. The connecting threaded sleeve is installed in the connecting hole by a limiting member. The elastic washer ring is fixed to the periphery of the connecting threaded sleeve. The edge of the elastic washer ring abuts against the inner wall of the worm gear box. The connecting threaded sleeve moves axially relative to the worm gear box. The connecting threaded sleeve is threaded with the transmission screw.

[0012] The drive assembly drives the worm gear seat to rotate. The worm gear seat drives the eccentric base and the transmission screw to rotate coaxially through the transmission pin. This causes the transmission screw to drive the eccentric cone head to move back and forth through the connecting screw sleeve. The elastic force of the elastic washer pushes the connecting screw sleeve, causing the eccentric cone head to have a tendency to push out and slide.

[0013] Through the above technical solution, when a pipe expander with a threaded sleeve spring washer is in normal use, the drive assembly drives the worm gear seat to rotate. The guide groove opened on the worm gear seat pushes the transmission pin to rotate through the side wall. The transmission pin drives the coaxially fixed eccentric base and the transmission screw to rotate synchronously. Due to the constraint of the circumferential rotation of the threaded sleeve spring washer by the limiting component, the transmission screw that is threaded with it is forced to produce axial displacement. At this time, the end of the transmission pin moves accordingly along the groove of the guide groove, thereby pushing the eccentric cone of the pipe cone assembly to achieve the forward and backward movement in the pipe expansion cavity. The elastic washer ring of the threaded sleeve spring washer forms a continuous pre-tightening force by radially elastically abutting against the inner wall of the worm gear box, so that the transmission screw always has an axial reset tendency, ensuring the stability of the cone advancement during pipe expansion operation, and automatically compensating for the gap after operation. During maintenance, it is only necessary to disconnect the fixed connection between the worm gear box and the housing to quickly separate the core components. The threaded sleeve spring washer can be replaced separately by removing the limiting component. While ensuring precise motion control, it simplifies the disassembly and assembly process and improves the ease of use.

[0014] Preferably, the connecting threaded sleeve is fitted with the elastic washer ring, and the fitting end of the elastic washer ring has a limiting protrusion ring for abutting against the elastic washer ring;

[0015] The connecting threaded sleeve has an annular groove, and the limiting member is embedded in the annular groove. The limiting member cooperates with the limiting protrusion to bidirectionally constrain the axial displacement of the connecting threaded sleeve in the connecting hole.

[0016] Through the above technical solution, the connecting threaded sleeve and the elastic washer adopt an interlocking structure. The interlocking end of the elastic washer extends into a limiting protrusion ring, which abuts against the end face of the connecting threaded sleeve to form an axial constraint. The outer wall of the connecting threaded sleeve is machined with an annular groove, in which a limiting element (such as a snap ring or pin) is embedded. This limiting element and the limiting protrusion ring form a bidirectional limiting, ensuring that the displacement stroke of the connecting threaded sleeve is controllable. The elastic deformation of the elastic washer can buffer the transmission impact and compensate for the wear clearance of the threaded pair, thereby improving the reliability and stability of the transmission.

[0017] Preferably, the connecting threaded sleeve also has a second annular groove, and the inner edge of the elastic washer ring is engaged in the second annular groove.

[0018] Through the above technical solution, the connecting threaded sleeve further restricts the elastic washer from detaching from the connecting threaded sleeve through the snap-fit ​​design of the second annular groove, thereby further improving stability.

[0019] Preferably, the connecting threaded sleeve is provided with at least one positioning protrusion, and the inner wall of the connecting hole is provided with a corresponding positioning groove for the directional protrusion to fit into.

[0020] Through the above technical solution, the outer wall of the connecting threaded sleeve is provided with at least one positioning protrusion, and the inner wall of the worm gear box connecting hole is correspondingly provided with a positioning groove. The two fit together to form a circumferential limit, which restricts the rotation of the connecting threaded sleeve in the connecting hole, suppresses the deflection and swing of the connecting threaded sleeve during the working process, maintains the axial linear motion relationship, and improves stability.

[0021] Preferably, the elastic washer is integrally connected to the end of the connecting threaded sleeve, the worm gear box is provided with multiple connecting seats, the threaded sleeve and the elastic washer are provided with corresponding clearance grooves along the circumference for the connecting seats to pass through, the connecting seats are provided with threaded holes for the connection of the limiting members, and the multiple limiting members cooperate to form an axial block on the edge of the elastic washer.

[0022] Through the above technical solution, the integrated design of the elastic washer and the connecting threaded sleeve eliminates the risk of seams and loosening in separate assembly, enhances the overall structure, and makes the deformation response of the elastic washer more uniform.

[0023] Multiple connecting seats are distributed along the periphery of the threaded sleeve spring washer in the worm gear box. The positions of the clearance grooves on the threaded sleeve spring washer are aligned with the positions of the connecting seats. The connecting seats are fitted into the clearance grooves. Then, each limiting component (such as screws) is threaded into the threaded hole. The ends of the screws form an axial block or compression on the edge of the elastic ring of the threaded sleeve spring washer, which restricts the circumferential rotation of the spring washer. The elastic ring is kept in stable contact with the inner wall of the worm gear box by multiple points of uniform constraint. During maintenance, only multiple limiting components need to be removed to release the axial constraint on the threaded sleeve spring washer, so as to realize the quick and independent replacement of the spring washer assembly.

[0024] Preferably, the drive assembly includes a drive member and an output worm gear disposed at its output end, the output worm gear meshing with the worm wheel seat.

[0025] With the above technical solution, when the drive unit starts, it drives the output worm to rotate, causing the worm wheel seat meshing with it to rotate around the axis. Through the high reduction ratio and self-locking function of the worm gear transmission, the control accuracy of the expansion force is improved, while the coupling relationship between the power input unit and the execution unit is simplified, thereby improving the reliability of the equipment.

[0026] Preferably, the tube cone assembly further includes a tube sleeve and a plane bearing, both of which are sleeved on the outside of the eccentric cone. The tube sleeve abuts against the eccentric base, and the plane bearing is located at the front end of the tube sleeve.

[0027] Through the above technical solution, the tube sleeve is fitted outside the eccentric cone and abuts against the eccentric base. When the transmission screw pushes the eccentric base, the tube sleeve evenly transmits the axial force to the eccentric cone. The plane bearing is located at the front end of the tube sleeve, so that the cone bears the radial load and reduces the frictional resistance when it rotates to expand the tube. This ensures that the cone advances and rotates smoothly in the expansion cavity. Through the layered bearing design, the stability of the eccentric cone's movement is improved, and the wear between the base and the cone is reduced, thus extending the service life of the component.

[0028] Preferably, the locking device includes:

[0029] The mold base includes two movable mold parts, namely a first movable mold part and a second movable mold part, which are hinged to each other, and a clamping cavity is formed between the first movable mold part and the second movable mold part.

[0030] The mold core is spliced ​​in the clamping cavity. The mold core includes two splicing parts, which are respectively disposed on the moving mold part one and the moving mold part two. A pressure channel for the pipe fitting to pass through is formed between the two splicing parts.

[0031] The locking mechanism includes a locking handle hinged to the second moving mold part and two movable connecting rods. The two ends of each movable connecting rod are respectively hinged to the middle of the first moving mold part and the locking handle. When the locking mechanism is locked, the hinge axis of the locking handle and the second moving mold part is located between the hinge axes of the two ends of the movable connecting rod, and the two splicing parts close and press together.

[0032] With the above technical solution, when the locking mechanism is unlocked, moving mold part one and moving mold part two are opened. At this time, the two splicing parts of the mold core are separated accordingly. The pipe to be processed is placed between the two splicing parts. When the two splicing parts are closed, the pressure pipe channel is reduced to clamp the pipe. During the locking process, the locking mechanism is switched to locking. The locking handle is rotated by pressing. The locking handle pulls moving mold part one in the closing direction in sync through two movable connecting rods. Using the hinge axis of the locking handle and moving mold part two as a lever, the two splicing parts are forced to close and the pressure pipe channel is reduced to clamp the pipe. At this time, the hinge axis of the locking handle is located between the hinge axes at both ends of the movable connecting rod, forming a self-locking dead point, thereby stably clamping the pipe for subsequent processing and restricting the workpiece from moving back and forth during processing.

[0033] Preferably, the expansion cavity is equipped with a locking sleeve, the locking device is detachably connected to the locking sleeve, the outer end of the locking sleeve has a plurality of limiting protrusions one protruding along the inner circumference, and a limiting groove is left between adjacent limiting protrusions one, the moving mold part one has a locking part, and the locking part one protrudes with limiting protrusion two corresponding to the limiting groove;

[0034] When the locking part is embedded in the locking sleeve, the second limiting protrusion passes through the corresponding limiting groove, and the locking device rotates so that the second limiting protrusion rotates to the inner side of the corresponding first limiting protrusion to form an abutment limit.

[0035] Through the above technical solution, the lock device achieves rapid assembly through the detachable connection between the locking part and the locking sleeve: During installation, the second limiting protrusion of the locking part is inserted into the limiting groove of the locking sleeve. After rotating the lock device, the second limiting protrusion rotates into the inner side of the first limiting protrusion and abuts against its inner wall. The mutual engagement of the first and second limiting protrusions can resist the torsional force generated during the expansion operation and prevent the lock device from accidentally loosening. During disassembly, the lock device is rotated in the opposite direction to realign the second limiting protrusion with the limiting groove for separation. Through the rotating snap-fit ​​design of the protrusion and groove, the lock can be quickly assembled and disassembled and positioned with high rigidity without the need for additional fasteners, simplifying the module replacement process.

[0036] The key and beneficial technical effects of this technical solution compared to existing technologies are:

[0037] 1. This technical solution integrates worm gear transmission and elastic self-compensation design, transforming the traditional nested structure into an integrated axial spring pad module. It utilizes the worm gear self-locking to ensure precise and stable cone head propulsion, and automatically compensates for the gap through the elastic preload of the threaded sleeve spring pad. The threaded sleeve spring pad can be replaced separately by removing the limiting component. While ensuring precise motion control, it simplifies the disassembly and assembly process and improves ease of use.

[0038] 2. This technical solution uses the fitting and installation of multiple connecting seats and screw sleeve spring washer relief grooves, and uses the limiting parts to constrain the elastic washer ring at multiple points to ensure stable contact and circumferential limiting. The axial obstruction can be quickly released by disassembling the limiting parts, and the spring washer can be replaced independently, taking into account both the uniformity of preload and the convenience of maintenance. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the overall structure of this embodiment;

[0040] Figure 2 This is a partial explosion diagram of this embodiment;

[0041] Figure 3 This embodiment Figure 2 Another perspective illustration;

[0042] Figure 4 This is a partial cross-sectional view of this embodiment;

[0043] Figure 5 This is a partial structural diagram of the shell hidden in this embodiment;

[0044] Figure 6 This is a partial structural diagram of the worm gear box and the screw sleeve spring washer in Example 1;

[0045] Figure 7 In Example 1 Figure 6 Schematic diagram of a partial explosion;

[0046] Figure 8 In Example 1 Figure 6 Partial sectional view;

[0047] Figure 9 This is a partial structural diagram of the worm gear box and the screw sleeve spring washer in Example 2;

[0048] Figure 10 In Example 2 Figure 9 Schematic diagram of a partial explosion;

[0049] Figure 11 This is a partial structural diagram of the threaded sleeve spring washer in Example 2;

[0050] Figure 12 In Example 2 Figure 9 Another perspective illustration.

[0051] Reference numerals: 1. Housing; 2. Locking device; 21. Mold base; 211. Moving mold part one; 212. Moving mold part two; 22. Mold core; 221. Joint; 23. Locking mechanism; 231. Locking handle; 232. Movable connecting rod; 3. Tube cone assembly; 31. Eccentric cone; 32. Eccentric base; 33. Tube bushing; 34. Surface bearing; 4. Worm gear assembly; 41. Worm gear seat; 42. Worm gear box; 5. Transmission assembly; 51. Transmission pin; 52. Transmission screw; 53. Threaded sleeve spring washer; 531. Connecting threaded sleeve; 532. Elastic washer ring 6. Guide groove; 7. Limiting component; 8. Connecting seat; 9. Clearance groove; 10. Threaded hole; 11. Mounting cavity; 12. Elastic compression space; 13. Driving component; 14. Output worm gear; 15. Locking sleeve; 16. Limiting protrusion one; 17. Limiting groove; 18. Locking part; 19. Limiting protrusion two; 20. Pressure tube channel; 24. Clamping cavity; 25. Expanding tube cavity; 26. Connecting hole; 27. Limiting protrusion ring; 281. Ring groove one; 282. Ring groove two; 29. ​​Positioning protrusion; 100. Fixing sleeve; 200. Snap-fit ​​ring groove; 300. Snap ring. Detailed Implementation

[0052] The specific implementation of this technical solution will be further described in detail below with reference to the accompanying drawings.

[0053] Example 1:

[0054] See Figure 1 A pipe expander with a screw sleeve and spring washer includes a housing 1. The housing 1 includes an upper pipe expanding end for pipe expanding operations and a lower handle for gripping. A switch may be provided on the handle. A locking device 2 may be detachably installed on the upper part of the housing 1, and a pipe expanding mechanism is installed inside the housing 1.

[0055] See Figure 2 , Figure 3 and Figure 4 The locking device 2 is detachably installed on the front side of the housing 1. It includes a mold base 21, a mold core 22, and a locking mechanism 23. The mold base 21 includes two movable mold parts 1 211 and 212 that are hinged to each other. The movable mold parts 1 211 and 212 are engaged by a multi-layer fitting structure. A hinge shaft is passed through the mating end face of the two to form a hinge shaft 1. A clamping cavity 24 is formed between the movable mold parts 1 211 and 212 to perform locking. When the mold is in motion, the two moving mold parts can rotate synchronously towards each other around the hinge axis, so that the clamping cavity 24 gradually closes; when the mold opening action is performed, they rotate in the opposite direction to unfold, realizing the opening state of the clamping cavity 24; the mold core 22 includes two splicing parts 221, the two splicing parts 221 are spliced ​​and installed in the clamping cavity 24, the two splicing parts 221 are respectively connected to the first moving mold part 211 and the second moving mold part 212, and a pressure tube channel 20 is formed between the two splicing parts 221.

[0056] The locking mechanism 23 includes a locking handle 231 and two movable links 232. The locking handle 231 is L-shaped and is located on the outside of the second moving mold part 212. The locking handle 231 is hinged to the second moving mold part 212 via a hinge pin to form a second hinge shaft. The hinge position is located at the shorter end of the locking handle 231. The hinge axis of the locking handle 231 is parallel to the hinge axis between the second moving mold part 212 and the first moving mold part 211. The two movable links 232 are symmetrically distributed on opposite sides of the mold base 21. One end of the two movable links 232 is respectively hinged to opposite sides of the first moving mold part 211 to form a third hinge shaft. The other end of the two movable links 232 is hinged to the bend in the middle section of the locking handle 231 to form a fourth hinge shaft. The hinge axes of the third and fourth hinge shafts are parallel to the hinge axis of the second hinge shaft.

[0057] The locking handle 231 switches between the first position and the second position. By rotating the locking handle 231 to the first position, the movable connecting rod 232 is driven to swing outward around the hinge axis three via the hinge axis four, releasing the constraint on the first and second moving mold parts. At this time, the two splicing parts 221 open simultaneously with the moving mold part one 211 and the moving mold part two 212, making it easier for the pipe to be installed into the pressure pipe channel 20. By operating the locking handle 231 in the opposite direction to rotate to the second position, the movable connecting rod 232 is pulled towards the mold base 21 and rotates closer, forcing the two splicing parts 221 to come closer and use the inner wall to squeeze the pipe until the hinge axis two of the locking handle 231 and the moving mold part two 212 is located between the hinge axis three and the hinge axis four at both ends of the movable connecting rod 232. At this time, the back and forth movement of the pipe is restricted. The splicing parts 221 shown in this embodiment all have a textured structure on the inner side.

[0058] The housing 1 has an expanded cavity 25 located on the front side of the housing 1. A locking sleeve 15 is installed inside the expanded cavity 25. The outer end of the locking sleeve 15 has a limiting protrusion 16 protruding along its inner circumference. There are three limiting protrusions 16, and a limiting groove 17 is left between adjacent limiting protrusions 16. The locking device 2 is detachably connected to the locking sleeve 15. Specifically, the detachable mechanism is achieved by the moving mold part 211 having a locking part 18, which is located on the side of the moving mold part 211 close to the locking sleeve 15 and is sized to match the locking sleeve 15. The moving mold parts 211 correspond one-to-one. The position of the limiting groove 17 has a limiting protrusion 2 19 protruding out. There are three limiting protrusions 2 19. By aligning the three limiting protrusions 2 19 with the three limiting grooves 17, the locking part 18 approaches and is embedded in the locking sleeve 15, so that each limiting protrusion 2 19 is embedded in the corresponding limiting groove 17. Rotating the locking device 2 causes the moving mold part 1 211 to drive the limiting protrusions 2 19 to rotate synchronously until the limiting protrusions 2 19 are built into the inner side of the corresponding limiting protrusion 16. Each set of limiting protrusions 16 and limiting protrusions 2 19 abut against each other axially to form a resisting limit.

[0059] See Figure 4 and Figure 5The housing 1 has a mounting cavity 11, and a tube expanding mechanism is installed in the mounting cavity 11. The tube expanding mechanism includes a tube cone assembly 3, a worm gear assembly 4, a drive assembly, and a transmission assembly 5. The worm gear assembly 4 includes a worm gear seat 41 and a worm gear box 42. The worm gear box 42 is fixedly installed in the mounting cavity 11, and the rear part of the worm gear seat 41 is embedded in the worm gear box 42, and the worm gear seat 41 is rotatably connected to the worm gear box 42. The drive assembly includes a drive element 13 and an output worm 14. The drive element 13 is preferably a motor, which can be installed in... Inside the handle at the bottom of the housing 1, one end of the output worm 14 is located at the output end of the drive member 13, and the other end extends toward the position of the pipe expander. The output worm 14 is rotatably set relative to the housing 1, and its rotation axis is perpendicular to the rotation axis of the worm gear seat 41. The output worm 14 and the worm gear seat 41 adopt a worm gear structure. The thread on the outer peripheral side wall of the output worm 14 meshes with the tooth marks on the outer peripheral wall of the worm gear seat 41. The drive member 13 drives the output worm 14 to rotate, thereby causing the worm gear seat 41 to rotate in coordination.

[0060] The tube cone assembly 3 is used for driven movement to expand the tube. The tube cone assembly 3 includes an eccentric cone 31, an eccentric base 32, a tube bushing 33, and a plane bearing 34. The eccentric base 32 is movably installed in the inner cavity of the worm gear seat 41. An eccentrically positioned slot is opened on the front end of the eccentric base 32 near the tube expansion cavity 25. The eccentric cone 31 is installed in the slot at the front end of the eccentric base 32. In this embodiment, the installation method of the eccentric cone 31 is shown. A fixing sleeve 100 is provided on the eccentric base 32. The fixing sleeve 100 has an inner hole. One end of the fixing sleeve 100 has lugs protruding from opposite sides of the inner hole. A retaining spring 300 is snapped between the ears. The retaining spring 300 is elastic and is roughly rectangular in shape, consisting of two parallel line segments connecting two crescent-shaped line segments. The column at the rear end of the eccentric cone 31 passes through the fixing sleeve 100. A retaining ring groove 200 is provided at the rear end of the eccentric cone 31 until the retaining ring groove 200 is engaged with the retaining spring 300. At this time, the eccentric cone 31 is fixedly connected to the fixing sleeve 100, and the fixing sleeve 100 is installed in the retaining groove. By prying out the eccentric cone 31, the retaining spring 300 is forced to deform and disengage from the engagement relationship, so that the eccentric cone 31 can be removed for replacement.

[0061] The transmission assembly 5 is used to convert the rotational power of the worm gear seat 41 into a power that can drive the eccentric base 32 to move horizontally; the tube sleeve 33 and the plane bearing 34 are sequentially fitted on the outside of the eccentric cone 31, and the tube sleeve 33 abuts against the eccentric base 32. Through the radial support and axial constraint of the plane bearing 34, the eccentric cone 31 is ensured to maintain a stable trajectory during rotation. When the eccentric base 32 is driven to rotate, the eccentric cone 31 generates periodic radial displacement under the guidance of the plane bearing 34, thereby converting the rotational motion into the radial extrusion force required for the pipe expansion operation.

[0062] The transmission assembly 5 includes a transmission pin 51, a transmission screw 52, ​​and a threaded sleeve washer 53. The transmission screw 52 is inserted into the rear end of the eccentric base 32. The transmission pin 51 passes through both the end of the eccentric base 32 and the front end of the transmission screw 52, ​​thus fixing them axially. The inner wall of the worm gear has a guide groove 6 formed by a recess along the traveling direction of the tube cone assembly 3. The number of guide grooves 6 can be one or two. In this embodiment, two guide grooves 6 are shown, and the two guide grooves 6 are symmetrically formed on the worm gear. On the inner wall of the wheel seat 41, both ends of the transmission pin 51 extend into and abut against the guide groove 6; the threaded sleeve spring washer 53 is sleeved on the outside of the transmission screw 52 and is threadedly engaged with it. The threaded sleeve spring washer 53 is movably disposed in the worm gear box 42. When the worm gear seat 41 rotates, the worm gear seat 41 drives the eccentric base 32 and the transmission screw 52 to rotate through the transmission pin 51. At the same time, the eccentric cone head 31 moves back and forth through the cooperation between the threaded sleeve spring washer 53 and the transmission screw 52. At this time, the end side of the transmission pin 51 moves accordingly along the guide groove 6.

[0063] See Figure 6 , Figure 7 and Figure 8 The threaded sleeve and spring washer 53 includes a connecting threaded sleeve 531 and an elastic washer ring 532. The connecting threaded sleeve 531 is cylindrical in shape. The worm gear box 42 is provided with a connecting hole 26. The connecting threaded sleeve 531 passes through the connecting hole 26. The connecting threaded sleeve 531 is provided with at least one positioning protrusion 29, which protrudes from the outer side wall of the connecting threaded sleeve 531. In this embodiment, there are two positioning protrusions 29. The two positioning protrusions 29 are symmetrically arranged on opposite sides of the connecting threaded sleeve 531. The inner wall of the connecting hole 26 is provided with a number of positioning grooves equal to the number of positioning protrusions 29. The positioning protrusions 29 are embedded in the positioning grooves one by one, which limits the connecting threaded sleeve 531 from rotating in the connecting hole. The inner side of the connecting threaded sleeve 531 has a through hole for threaded connection of the transmission screw 52.

[0064] The elastic washer 532 is umbrella-shaped and has an annular hole in the center. One end of the connecting screw sleeve 531 has a limiting protrusion 27, which protrudes from the outer wall of the connecting screw sleeve 531. The other end of the connecting screw sleeve 531 passes through the annular hole of the elastic washer 532, so that the limiting protrusion 27 abuts against the outer wall of the elastic washer 532. The connecting screw sleeve 531 has an annular groove 282, which is opened on the outer wall of the connecting screw sleeve 531 and located on the inner side near the limiting protrusion 27. The inner edge of the elastic washer 532 is embedded in the annular groove 282.

[0065] The threaded sleeve spring washer 53 also has an annular groove 281, which is located at the end of the threaded sleeve spring washer 53 away from the annular groove 282. The threaded sleeve spring washer 53 is provided with a limiting member 7, which is preferably a retaining spring. When the end of the threaded sleeve spring washer 53 with the annular groove 281 passes through the connecting hole 26, the limiting member 7 is embedded in the annular groove 281. The limiting member 7 abuts against the side wall of the worm gear box 26. At this time, the threaded sleeve spring washer 53 is limited to disengage from the connecting hole 26 from this side. The limiting member 7 and the limiting protrusion ring 27 cooperate to bidirectionally constrain the axial displacement of the connecting sleeve 531 in the connecting hole 26. The edge of the elastic washer ring 532 abuts against the corresponding inner wall of the worm gear box 42. The elastic washer ring 532 has elastic deformation capability. There is an elastically compressible space between the elastic washer ring 532 and the worm gear box 42. The radial elastic deformation generated by the elastic washer ring 532 under the action of preload is compensated for by compressing the elastic compression space 12, thereby realizing the dual functions of dynamic sealing and vibration buffering.

[0066] The specific work process of this plan is as follows:

[0067] When the drive assembly rotates the worm gear seat 41, the guide groove 6 on the worm gear seat 41 pushes the transmission pin 51 to rotate through the side wall. The transmission pin 51 drives the coaxially fixed eccentric base 32 and the transmission screw 52 to rotate synchronously. Because the limiting member 7 restricts the circumferential rotation of the threaded sleeve spring washer 53, it forces the transmission screw 52, ​​which is threaded with it, to produce axial displacement. At this time, the end of the transmission pin 51 moves accordingly along the groove of the guide groove 6, thereby pushing the eccentric cone 31 of the tube cone assembly 3 to realize the expansion of the tube cavity 25. Forward and backward movement; the elastic washer ring 532 of the threaded sleeve spring washer 53 forms a continuous pre-tightening force by radially elastically abutting against the inner wall of the worm gear box 42, so that the transmission screw 52 always has an axial reset tendency, ensuring the stability of the cone head advancement during pipe expansion operation, and automatically compensating for the gap after operation. During maintenance, it is only necessary to disconnect the fixed connection between the worm gear box 42 and the housing 1 to quickly separate the core component. The threaded sleeve spring washer 53 can be replaced separately by removing the limiting part 7. While ensuring precise motion control, it simplifies the disassembly and assembly process and improves the ease of use.

[0068] Example 2:

[0069] See Figure 9A tube expander with a threaded sleeve and spring washer, differing from Embodiment 1 in that the threaded sleeve and spring washer 53 includes a connecting threaded sleeve 531 and an elastic washer ring 532. The elastic washer ring 532 is integrally connected to the periphery of the end of the connecting threaded sleeve 531. The threaded sleeve and spring washer 53 is connected by at least three connecting seats 8 provided by the worm gear box 42. The multiple connecting seats 8 are distributed on the periphery of the threaded sleeve and spring washer 53. The threaded sleeve and spring washer 53 is provided with an equal number of clearance grooves 9 corresponding to the positions of the connecting seats 8. The clearance grooves 9 are U-shaped, so that each connecting seat 8 can be accurately embedded into the groove. Each connecting... Each seat 8 is provided with a threaded hole 10, and a limiting member 7 is connected to each threaded hole 10. The limiting member 7 is preferably a fastening screw. After the limiting member 7 is connected, its head step surface and the annular bearing surface on the back side of the elastic washer 532 form an axial limit. The planar constraint system formed by the three limiting members 7 can maintain the degree of freedom of movement of the elastic washer 532 and prevent the component from axially dislodging. The radial elastic deformation generated by the elastic washer 532 under the action of pre-tightening force is compensated for by the displacement through the compression elastic compression space 12, thereby realizing the dual functions of dynamic sealing and vibration buffering.

[0070] The foregoing has shown and described the basic principles, main features, and advantages of this technical solution. Those skilled in the art should understand that this technical solution is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this technical solution. Various changes and modifications can be made to this technical solution without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed technical solution. The scope of protection of this technical solution is defined by the appended claims and their equivalents.

Claims

1. A pipe expander with a sleeve gasket, characterized in that, The device includes a housing (1), a locking device (2), and a tube expanding mechanism. The housing (1) has a mounting cavity (11), and the tube expanding mechanism is disposed in the mounting cavity (11) for expanding the tube. The tube expanding mechanism includes: The conical tube assembly (3) includes an eccentric conical tube (31) and an eccentric base (32), and the housing (1) also has an expanding cavity (25), the conical end of the eccentric conical tube (31) being located in the expanding cavity (25); The worm gear assembly (4) includes a worm gear seat (41) and a worm gear box (42). The worm gear box (42) is fixedly connected to the housing (1). The worm gear seat (41) is rotatably arranged relative to the worm gear box (42). The inner side of the worm gear seat (41) is formed with a guide groove (6) corresponding to the travel direction of the eccentric cone (31). The transmission assembly (5) includes a transmission pin (51), a transmission screw (52), and a threaded sleeve washer (53). The transmission pin (51) is coaxially fixed to the eccentric base (32) and the transmission screw (52). The ends of the transmission pin (51) are all limited in the guide groove (6). The front end of the transmission screw (52) is connected to the eccentric base (32), and the rear end of the transmission screw (52) is connected to the threaded sleeve washer (53). The threaded sleeve and spring washer (53) includes a connecting threaded sleeve (531) and an elastic washer ring (532). The worm gear box (42) is provided with a connecting hole (26). The connecting threaded sleeve (531) is installed in the connecting hole (26) by a limiting member (7). The elastic washer ring (532) is fixed to the periphery of the connecting threaded sleeve (531). The edge of the elastic washer ring (532) abuts against the inner wall of the worm gear box (42). The connecting threaded sleeve (531) moves axially relative to the worm gear box (42). The connecting threaded sleeve (531) is threadedly engaged with the transmission screw (52). The drive assembly drives the worm gear seat (41) to rotate. The worm gear seat (41) drives the eccentric base (32) and the transmission screw (52) to rotate coaxially through the transmission pin (51). The transmission screw (52) drives the eccentric cone (31) to move back and forth through the connecting sleeve (531). The elastic force of the elastic washer (532) pushes the connecting sleeve (531), making the eccentric cone (31) have a tendency to push out and slide.

2. The pipe expander with a sleeve gasket according to claim 1, characterized in that: The connecting threaded sleeve (531) is fitted with the elastic washer (532), and the fitted end of the elastic washer (532) has a limiting protrusion ring (27) for abutting against the elastic washer (532). The connecting threaded sleeve (531) has an annular groove (281) and the limiting member (7) is embedded in the annular groove (281). The limiting member (7) and the limiting protrusion (27) cooperate to bidirectionally constrain the axial displacement of the connecting threaded sleeve (531) in the connecting hole (26).

3. The pipe expander with a sleeve gasket according to claim 1, characterized in that: The connecting threaded sleeve (531) is also provided with an annular groove (282), and the inner edge of the elastic washer (532) is engaged in the annular groove (282).

4. The pipe expander with a sleeve gasket according to claim 1, characterized in that: The connecting threaded sleeve (531) is provided with at least one positioning protrusion (29), and the inner wall of the connecting hole (26) is provided with a positioning groove for the positioning protrusion (29) to fit into.

5. The pipe expander with a sleeve gasket according to claim 1, characterized in that: The elastic washer (532) is integrally connected to the end of the connecting threaded sleeve (531). The worm gear box (42) is provided with multiple connecting seats (8). The threaded sleeve washer (53) is provided with corresponding clearance grooves (9) along its circumference for the connecting seats (8) to pass through. The connecting seats (8) are provided with threaded holes (10) for the connection of the limiting members (7). The multiple limiting members (7) cooperate to form an axial block on the edge of the elastic washer (532).

6. The pipe expander with a sleeve gasket according to claim 1, characterized in that: An elastic compression space (12) is provided between the elastic washer ring (532) and the worm gear box (42).

7. The pipe expander with a sleeve gasket according to claim 1, characterized in that: The connecting threaded sleeve (531) drive assembly includes a drive member (13) and an output worm (14) disposed at its output end, the output worm (14) meshing with the worm wheel seat (41).

8. The pipe expander with a sleeve gasket according to claim 1, characterized in that: The tube cone assembly (3) also includes a tube sleeve (33) and a plane bearing (34), both of which are sleeved outside the eccentric cone (31). The tube sleeve (33) abuts against the eccentric base (32), and the plane bearing (34) is located at the front end of the tube sleeve (33).

9. The pipe expander with a sleeve gasket according to claim 1, characterized in that: The locking device (2) includes: The mold base (21) includes two movable mold parts 1 (211) and 2 (212) that are hinged to each other, and the movable mold parts 1 (211) and 2 (212) form a clamping cavity (24) between them. The mold core (22) is spliced ​​in the clamping cavity (24). The mold core (22) includes two splicing parts (221). The two splicing parts (221) are respectively arranged on the moving mold part one (211) and the moving mold part two (212). A pressure channel (20) for the pipe fitting to pass through is formed between the two splicing parts (221). The locking mechanism (23) includes a locking handle (231) hinged to the second moving mold part (212) and two movable connecting rods (232). The two ends of each movable connecting rod (232) are respectively hinged to the middle of the first moving mold part (211) and the locking handle (231). When the locking mechanism (23) is locked, the hinge axis of the locking handle (231) and the second moving mold part (212) is located between the hinge axes of the two ends of the movable connecting rod (232), and the two splicing parts (221) close and press together.

10. The pipe expander with a sleeve gasket according to claim 9, characterized in that: The expansion cavity (25) is equipped with a locking sleeve (15), and the locking device (2) is detachably connected to the locking sleeve (15). The outer end of the locking sleeve (15) has several limiting protrusions (16) protruding along the inner circumference. A limiting groove (17) is left between adjacent limiting protrusions (16). The moving mold part (211) has a locking part (18). The locking part (18) protrudes with limiting protrusions (19) corresponding to the limiting grooves (17). When the locking part (18) is embedded in the locking sleeve (15), the second limiting protrusion (19) passes through the corresponding limiting groove (17), and the locking device (2) rotates so that the second limiting protrusion (19) rotates to the inside of the corresponding first limiting protrusion (16) to form a stop limiting.

Images