An automatic electric pipe expander

Abstract

The technical scheme belongs to the technical field of pipe expanders and specifically relates to an automatic electric pipe expander, which comprises a shell with a mounting cavity and a pipe expanding cavity, a pipe expanding mechanism arranged in the mounting cavity, and a lock mechanism, wherein the pipe expanding mechanism comprises a taper head assembly, a turbine assembly, a transmission assembly, an elastic member and a driving assembly, the transmission assembly comprises a transmission pin, a transmission screw rod, a transmission screw sleeve and the elastic member, the transmission pin penetrates the eccentric base and the transmission screw rod radially and has an outer end penetrating the eccentric base and extending into and abutting against the turbine assembly, the transmission screw rod is connected with the taper head assembly at the front end, the transmission screw sleeve is sleeved on the transmission screw rod and connected with the turbine assembly, the transmission pin is used for driving the transmission screw rod to rotate, the taper head assembly is moved along the pipe expanding direction through cooperation between the transmission screw rod, the transmission screw sleeve and the turbine assembly, the elastic member is sleeved on the transmission screw rod and used for buffering the impact force of the transmission screw rod on the turbine assembly, and the driving assembly is used for driving the transmission pin to rotate.

Description

Technical Field

[0001] This technical solution relates to the field of pipe expander technology, specifically to an automatic electric pipe expander. Background Technology

[0002] An electric pipe expander is a device that expands one end of a pipe by squeezing. The pipe can be a plastic pipe or a thin metal pipe. Electric pipe expanders are widely used in industries such as petroleum, chemical, power, metallurgy, shipbuilding, and refrigeration for the manufacture and maintenance of boilers, heat exchangers, condensers, coolers, and other pressure vessels.

[0003] Chinese patent CN118543753A discloses an electric expander. The guide groove of the turbine body drives the first positioning rod to rotate through the transmission shaft, which in turn drives the first positioning component to rotate, thereby realizing the movement of the eccentric base. This transmission method is relatively complex and involves many components, resulting in low transmission efficiency. Furthermore, the electric expander in this application does not have a buffer component. Summary of the Invention

[0004] The purpose of this technical solution is to provide an automatic electric pipe expander. By improving the transmission component structure within the pipe expander mechanism and adding components for buffering and clutching, the problem of complex transmission structure and inability to buffer in the original pipe expander is solved.

[0005] The purpose of this technical solution is achieved as follows: An automatic electric pipe expander includes: a housing having an installation cavity and a pipe expanding cavity; a pipe expanding mechanism disposed in the installation cavity for expanding a pipe; and a locking mechanism disposed in the pipe expanding cavity, wherein a clamp assembly is disposed within the locking mechanism, and the locking mechanism cooperates with the clamp assembly to lock the pipe fitting; wherein the pipe expanding mechanism includes: a cone assembly including an eccentric cone and an eccentric base; A turbine assembly includes a turbine base and a turbine housing, the turbine housing being fixedly connected to a shell, and the turbine base being rotatably disposed within a mounting cavity; the inner wall of the turbine base is recessed along the travel direction of the eccentric cone to form a guide groove; a transmission assembly includes a transmission pin, a transmission screw, a transmission sleeve, and an elastic element, the transmission pin radially penetrating both the eccentric base and the transmission screw, with its outer end extending out of the eccentric base and simultaneously extending into and abutting against the guide groove; the front end of the transmission screw is connected to the eccentric base, the transmission sleeve is fitted over the transmission screw and is connected and engaged with the turbine housing; the transmission pin drives the transmission screw to rotate, and the engagement between the transmission screw, the transmission sleeve, and the turbine housing enables the eccentric cone to move along the expansion direction; the elastic element is fitted over the transmission screw to buffer the impact force of the transmission screw on the turbine housing; and a drive assembly is used to drive the turbine base of the turbine assembly to rotate.

[0006] Preferably, the transmission assembly further includes a threaded sleeve and a spring washer, which replaces the transmission threaded sleeve and the elastic element; the threaded sleeve and spring washer includes a threaded sleeve portion that is threaded onto the transmission screw and an umbrella-shaped elastic portion, the outer edge of the elastic portion abutting against the inner wall of the turbine housing and being circumferentially confined within the turbine housing; the connection between the threaded sleeve portion and the elastic portion is elastic and can be deflected under the action of external force.

[0007] Preferably, the transmission sleeve and the transmission screw are threadedly connected, and the transmission sleeve is circumferentially confined within the turbine housing; the front end of the transmission sleeve is bent to form a retaining ring; the front and rear ends of the elastic element abut against the retaining ring and the inner wall of the turbine housing, respectively; when the eccentric cone rotates without moving, the transmission screw continues to move and acts on the elastic element to cause it to contract, thereby achieving buffering of the eccentric cone during tube expansion; the elastic element is configured as an umbrella-shaped ring, the front end of the transmission sleeve extends into the turbine housing, the ring is sleeved outside the transmission sleeve, and abuts against the inner wall of the turbine housing.

[0008] Preferably, the transmission screw sleeve has a limiting part protruding from its circumference, and the limiting part is movably engaged in the limiting groove of the turbine housing. The transmission screw sleeve is limited in the circumferential direction of the turbine housing through the cooperation of the limiting part and the limiting groove. The inner ring of the ring plate has an opening adapted to the shape of the limiting part, and the opening is used to install the ring plate.

[0009] Preferably, a spring piece is provided at the opening, which can deflect under the action of external force; when the ring piece is installed on the transmission screw sleeve, the spring piece contacts the limiting part of the transmission screw sleeve and is pushed open by the limiting part to realize the installation of the ring piece, and after the installation is completed, the ring piece is engaged in the groove formed between the front end of the transmission screw sleeve and the limiting part.

[0010] Preferably, the elastic element is configured as a disc spring assembly, with its front and rear ends respectively abutting against the retaining ring and the inner wall of the turbine housing; the turbine housing has an oblong hole; the transmission sleeve has a plug hole; the turbine housing is also provided with a plug rod, which is disposed in the plug hole through the oblong hole to limit the transmission sleeve to be located in the circumferential direction of the turbine housing.

[0011] Preferably, the rear end of the transmission screw is provided with a clutch seat; the clutch seat is provided with a snap-fit ​​part, and the transmission sleeve has a snap-fit ​​groove adapted to the snap-fit ​​part; the transmission sleeve and the turbine housing are threadedly connected, and the transmission screw drives the transmission sleeve to rotate through the clutch seat, and then the eccentric cone head is fed through the threaded engagement between the transmission sleeve and the turbine housing; when the tube expands to the point where the eccentric cone head rotates in place, the transmission sleeve compresses the elastic element and continues to move along the tube expansion direction until the snap-fit ​​part disengages from the snap-fit ​​groove, thereby realizing the engagement and disengagement of the transmission sleeve.

[0012] Preferably, the locking mechanism includes: a movable member, the middle of which is hinged to the housing and the front end of which is provided with a pressing part, the pressing part being used to press against the clamp assembly inside the expansion cavity and lock the clamp assembly to the inner wall of the expansion cavity; a reset member, which is used to ensure that the front end of the movable member always tends to move away from the clamp assembly inside the expansion cavity; and a handle, the upper end of which is hinged to the housing and the upper edge of which is provided with a pushing part, the pushing part being used to abut against the rear end of the movable member and to drive the movable member; wherein, the pushing part has an abutting surface, the abutting surface including a concave part, a convex part and a locking part connected in sequence, the distance of the concave part, the convex part and the locking part from the hinge point of the handle on the housing increasing in sequence; during the clamping of the clamp assembly, the lower end of the movable member abuts against the concave part, the convex part and the locking part in sequence; when the clamp assembly is locked, the lower end of the movable member is placed in the locking part.

[0013] Preferably, the housing is provided with a movable pin, and the middle part of the movable component is hinged to the housing by the movable pin; the lower end of the movable component is provided with a mounting groove, and an abutment wheel is rotatably disposed in the mounting groove; the abutment wheel abuts against the abutment surface of the handle.

[0014] Preferably, a plurality of positioning pins are provided in the expansion cavity, and a positioning groove adapted to the positioning pins is provided on the side wall of the clamp assembly; when the clamp assembly is placed in the set position, the positioning pins are placed in the positioning groove.

[0015] The key and beneficial technical effects of this technical solution compared to existing technologies are: 1. The transmission assembly designed in this technical solution is used to transmit the power input from the drive assembly to the cone assembly, and also to buffer the impact force of the transmission screw on the turbine housing. The transmission assembly includes only three transmission components and one elastic component. The transmission pin is movably engaged in the guide groove of the turbine seat and simultaneously inserted into the transmission screw and the eccentric base, which can synchronously drive the transmission screw and the eccentric base to rotate. The transmission screw is fixedly set in the eccentric base, and the transmission sleeve is movably set on the turbine housing and simultaneously threaded with the transmission screw, which can realize the movement of the eccentric base along the tube expansion direction. The elastic component is sleeved outside the transmission screw, which can buffer the impact force of the transmission screw on the turbine housing when the eccentric cone head expands the tube. The overall structure of the transmission assembly is simple, the number of parts is small, and the transmission efficiency is high.

[0016] 2. In this technical solution, a clutch seat is also provided between the transmission component and the cone component. Through the cooperation of the clutch seat and the transmission screw sleeve, the eccentric cone head can move in a limited manner during feeding. After the expansion is completed, even if the transmission screw continues to rotate, the eccentric cone head will not continue to move forward due to the cooperation of the clutch seat and the transmission screw sleeve. This ensures that the pipe will not be over-expanded and damaged.

[0017] 3. The movable part of the locking mechanism designed in this technical solution is hinged to the housing in the middle. After its lower end is driven by the handle, its upper end moves towards the chuck assembly placed in the expansion tube cavity to lock the chuck assembly. The handle can directly drive the movable part to rotate, resulting in stable transmission. No additional components are required, and the structure is simple. The abutment surface of the handle includes a concave part, a convex part, and a locking part. The distances from the concave part, the convex part, and the locking part to the hinge point of the handle on the housing increase sequentially. During the clamping of the chuck assembly, the lower end of the movable part abuts against the concave part, the convex part, and the locking part in sequence. During the process of the movable part abutting against the concave part to the convex part, the movable part can respond quickly and clamp the chuck assembly rapidly. When the movable part abuts against the locking part, the state of the movable part is more stable, ensuring that the chuck assembly will not loosen during the expansion of the tube. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of Example 1.

[0019] Figure 2 This is a schematic diagram of the structure of the drive component and the turbine component in Example 1.

[0020] Figure 3 This is a cross-sectional view of the tube expansion mechanism in Example 1.

[0021] Figure 4 This is a schematic diagram of the fit between the clutch seat and the transmission sleeve in Example 1.

[0022] Figure 5 This is a cross-sectional view of the tube expansion mechanism in Example 2.

[0023] Figure 6 This is a schematic diagram of the structure of the elastic element and the turbine box in Example 2.

[0024] Figure 7 This is a schematic diagram of the elastic element in Example 2.

[0025] Figure 8 This is a schematic diagram of the structure of the elastic element, transmission screw sleeve and turbine box in Example 3.

[0026] Figure 9 This is a schematic diagram of the elastic element and transmission screw sleeve in Example 3.

[0027] Figure 10 This is a cross-sectional view of the fit between the elastic element, the transmission screw sleeve, and the turbine housing in Example 3.

[0028] Figure 11 This is a cross-sectional view of some components in Example 4.

[0029] Figure 12 This is a schematic diagram of the structure of some components in Example 4.

[0030] Figure 13 This is a cross-sectional view of some components in Example 5.

[0031] Figure 14 This is a schematic diagram of the structure of some components in Example 5.

[0032] Figure 15 This is a schematic diagram of the internal structure of the chuck mechanism.

[0033] Figure 16 This is an exploded view of the chuck mechanism.

[0034] Figure 17 This is a cross-sectional view of the chuck mechanism.

[0035] Figure 18 This is a schematic diagram of the structure when the moving part and the locking part are in contact.

[0036] Figure 19 This is a schematic diagram of the structure when the movable part and the protrusion are in contact.

[0037] Figure 20 This is a schematic diagram of the structure when the movable part and the recessed part are in contact.

[0038] Reference numerals: 1. Housing; 11. Mounting cavity; 12. Expanding tube cavity; 3. Locking mechanism; 31. Moving part; 32. Pressing part; 33. Resetting part; 34. Handle; 35. Pushing part; 36. Abutting surface; 361. Recess; 362. Protrusion; 363. Locking part; 37. Moving pin; 38. Mounting groove; 39. Abutting wheel; 41. Left clamping block; 42. Right clamping block; 43. Pin; 44. Positioning pin; 45. Positioning groove; 5. Cone assembly; 51. Eccentric cone; 52. Eccentric base; 53. Turbine assembly; 531. Turbine seat; 5311. Guide groove; 5 32. Turbine housing; 5321. Limiting groove; 5322. Waist-shaped hole; 54. Drive assembly; 541. Drive component; 542. Output screw; 61. Transmission pin; 62. Transmission screw; 63. Transmission sleeve; 631. Retaining ring; 632. Limiting part; 633. Insertion hole; 634. Insertion rod; 635. Snap-fit ​​groove; 64. Elastic element; 65. Sleeve spring washer; 651. Sleeve part; 652. Elastic part; 66. Notch; 7. Ring piece; 71. Opening; 72. Spring piece; 73. Snap-fit ​​groove; 74. Disc spring assembly; 8. Clutch seat; 81. Snap-fit ​​part; 82. Clutch pin. Detailed Implementation

[0039] The specific implementation of this technical solution will be further described in detail below with reference to the accompanying drawings.

[0040]

Example 1

[0041] Specifically, the pipe expanding mechanism includes a cone assembly 5, a turbine assembly 53, a transmission assembly, and a drive assembly 54. The drive assembly 54 is used to provide power for pipe expanding. It can be powered by a battery or by connecting wires. The drive assembly 54 first drives the turbine housing 532 of the turbine assembly 53 to rotate. After the turbine housing 532 rotates, it drives the transmission assembly to rotate. After the transmission assembly rotates, it drives the cone assembly 5 to rotate and move, thereby realizing pipe expanding.

[0042] like Figure 3 As shown, the drive assembly 54 includes a drive member 541 and an output screw 542 disposed at its output end. The drive member 541 is a drive motor. The output screw 542 can be driven by the drive motor to rotate. The other end of the output screw 542 is limited in the mounting cavity 11 by a bearing. The output screw 542 has threads on its circumference and is located beside the turbine assembly 53. The threads of the output screw 542 can cooperate with the turbine seat 531 of the turbine assembly 53. When the output screw 542 rotates, it can drive the turbine seat 531 to rotate, and then drive the cone assembly 5 to work through the transmission assembly.

[0043] The cone assembly 5 includes an eccentric base 52 and an eccentric cone 51. The eccentric cone 51 is mounted on the eccentric base 52. A bushing and a flat bearing are provided between the eccentric cone 51 and the eccentric base 52. Both the bushing and the flat bearing are sleeved on the outside of the eccentric cone 51. The bushing abuts against the eccentric base 52, and the flat bearing is located at the front end of the bushing. The bushing and the flat bearing work together to buffer the impact force between the eccentric cone 51 and the eccentric base 52, thereby reducing equipment wear and increasing its service life.

[0044] The turbine assembly 53 is used to receive power from the drive assembly 54 and transmit power. The turbine assembly 53 includes a turbine housing 532 and a turbine seat 531 rotatably disposed in the turbine housing 532. The turbine housing 532 is fixedly connected to the housing 1 by bolts. The turbine seat 531 has teeth on its periphery that are adapted to the threads of the output screw 542. The turbine seat 531 can be driven to rotate by rotating the output screw 542. The inner wall of the turbine seat 531 is recessed along the travel direction of the eccentric cone head 51 to form a guide groove 5311. The guide groove 5311 is used to cooperate with the transmission pin 61 of the transmission assembly, that is, to drive the transmission pin 61 to rotate and to provide space for the movement of the transmission pin 61.

[0045] The transmission assembly converts the rotational power of the turbine housing 531 into a power that can drive the eccentric base 52 to move horizontally. The transmission assembly includes a transmission pin 61, a transmission screw 62, a transmission sleeve 63, and an elastic element 64. The transmission pin 61 radially penetrates both the eccentric base 52 and the transmission screw 62, meaning the middle section of the transmission pin 61 is inserted into both the eccentric base 52 and the transmission screw 62. Thus, when the transmission pin 61 rotates, it drives the eccentric base 52 and the transmission screw 62 to rotate simultaneously. Both ends of the transmission pin 61 protrude from the eccentric base 52 and extend into and abut against the guide groove 5311 of the turbine housing 531. Therefore, when the turbine... When the wheel seat 531 rotates, it drives the transmission pin 61 to rotate. The front end of the transmission screw 62 is connected to the eccentric base 52, and the outer side of the rear end of the transmission screw 62 is fitted with a transmission sleeve 63. The circumference of the transmission sleeve 63 is threadedly connected to the turbine box 532. In this way, when the transmission pin 61 drives the transmission screw 62 to rotate, the transmission sleeve 63 can be rotated. At the same time, through the thread action between the transmission sleeve 63 and the turbine box 532, the eccentric cone head 51 can be moved along the direction of travel. Meanwhile, the transmission pin 61 can also drive the eccentric cone head 51 to rotate through the eccentric base 52, thus realizing the rotation of the eccentric cone head 51 when it moves.

[0046] like Figure 2 and Figure 4As shown, a clutch seat 8 is provided at the rear end of the transmission screw 62, and a transmission sleeve 63 is located at the front end of the clutch seat 8. The transmission sleeve 63 is threadedly connected to the turbine housing 532. A clutch pin 82 is provided inside the clutch seat 8, and the clutch pin 82 passes through both the transmission screw 62 and the clutch seat 8. Thus, when the transmission screw 62 rotates, it can drive the clutch seat 8 to rotate. The clutch seat 8 is provided with a snap-fit ​​part 81, and the transmission sleeve 63 has a snap-fit ​​groove 635 that matches the snap-fit ​​part 81. When the tube is not expanded, the snap-fit ​​part 81 is placed in the snap-fit ​​groove 635. When the tube expansion begins, the transmission sleeve 63 and the clutch seat 8 rotate and move synchronously through the action between the snap-fit ​​part 81 and the snap-fit ​​groove 635. When the tube expansion begins... When the eccentric cone 51 rotates but does not move, the clutch seat 8 continues to rotate but does not move. Since there is still room for movement at the front end of the transmission sleeve 63, the transmission sleeve 63 will compress the elastic element 64 and continue to move until the locking part 81 disengages from the locking groove 635. During this period, the elastic element 64 can effectively buffer the radial impact force of the transmission sleeve 63 on the turbine seat 531. The elastic element 64 is also used to make the transmission sleeve 63 always tend to move towards the clutch seat 8. When the locking part 81 disengages from the locking groove 635, the clutch seat 8 continues to rotate, while the transmission sleeve 63 stops rotating, so it will not continue to push the eccentric cone 51 to move, thereby realizing the clutch and effectively preventing excessive expansion of the tube.

[0047] like Figure 15-17 As shown, the locking mechanism 3 includes a movable member 31, a reset member 33, and a handle 34. The movable member 31 is used to lock the clamp assembly by its own movement. Its middle part is hinged to the housing 1, and its front end is provided with a pressing part 32. The pressing part 32 movably abuts against the side wall of the clamp assembly. The reset member 33 is used to ensure that the pressing part 32 always has a tendency to move away from the clamp assembly. The handle 34 is used to input rotational power to the movable member 31. Its upper end is hinged to the housing 1, and its upper edge is provided with a pushing part 35. The pushing part 35 movably abuts against the rear end of the movable member 31. When the clamp assembly is located in the expansion cavity 12, rotating the handle 34, under the action of the pushing part 35, pushes the rear end of the movable member 31 to move, thereby causing the front end of the movable member 31 to press against the clamp assembly in the expansion cavity 12, and cooperate with the inner wall of the expansion cavity 12 to lock the clamp assembly.

[0048] Furthermore, the pushing part 35 has an abutting surface 36, which includes a recess 361, a protrusion 362, and a locking part 363 connected in sequence. The distance from the hinge point of the recess 361, the protrusion 362, and the locking part 363 on the housing 1 to the handle 34 increases sequentially. During the clamping process, the lower end of the movable member 31 abuts against the recess 361, the protrusion 362, and the locking part 363 in sequence, thus realizing the rotation drive of the movable member 31. When the chuck is locked, the lower end of the movable member 31 is placed in the locking part 363. At this time, the movable member 31 has pushed the chuck assembly to the set position, which is the position for preparing to expand the tube. At this time, the tube to be expanded is located on the moving path of the eccentric cone head 51. The locking part 363 can limit the rear end of the movable member 31 to ensure that the chuck assembly is always clamped, thereby increasing the stability during tube expansion.

[0049] Furthermore, such as Figure 18-20 As shown, since the distances from the concave portion 361, the convex portion 362, and the locking portion 363 to the hinge point on the housing 1 of the handle 34 increase sequentially, the movable part 31 can be rotated when the handle 34 is rotated. Figure 8 This is a schematic diagram showing the structure when the movable part and the locking part 363 are in contact. At this time, the front end of the movable part 31 has not yet entered the expansion cavity 12. Figure 9 This is a schematic diagram showing the structure when the movable part and the protrusion 362 abut against each other. At this time, the movable part 31 begins to rotate, enters the expanding cavity 12, and moves towards the clamp assembly. Figure 20 This is a schematic diagram of the structure when the movable part and the recess 361 abut against each other. At this time, the movable part 31 has already locked the clamp assembly with the inner wall of the housing 1, and at the same time, it has also achieved its own locking.

[0050] like Figure 15-17 As shown, a movable pin 37 is provided on the housing 1. The middle part of the movable part 31 is hinged to the housing 1 by the movable pin 37. The lower end of the movable part 31 is provided with a mounting groove 38. An abutment wheel 39 is rotatably arranged in the mounting groove 38. The abutment wheel 39 abuts against the abutment surface 36 of the handle 34. The reset part 33 is configured as a torsion spring. The torsion spring is sleeved on the movable pin 37, and its two ends are respectively connected to the housing 1 and the movable part 31. When the handle 34 is depressurized, the torsion spring can drive the movable pin 37 to reset, so that it abuts against the recess 361, ready for the tube to expand again.

[0051] like Figure 16As shown, the chuck assembly includes a left clamping block 41 and a right clamping block 42. The left clamping block 41 and the right clamping block 42 are hinged at one end and connected at the other end by a pin 43. A protrusion is provided on the upper end of the movable part 31, which movably abuts against the pin 43. This avoids direct contact between the movable part 31 and the left clamping block 41, which can reduce the wear of the chuck assembly. Several positioning pins 44 are provided in the expansion cavity 12. The side wall of the chuck is provided with positioning grooves 45 that are adapted to the positioning pins 44. When the chuck assembly is placed in the set position, the positioning pins 44 are placed in the positioning grooves 45. The cooperation between the positioning pins 44 and the positioning grooves 45 is used to fix the chuck assembly in the insertion direction.

[0052]

Example 2

[0053] Specifically, the threaded sleeve 65 includes a threaded sleeve portion 651 threaded onto the transmission screw 62 and an umbrella-shaped elastic portion 652. The outer edge of the elastic portion 652 abuts against the inner wall of the turbine housing 532 and is circumferentially confined within the turbine housing 532. The connection between the threaded sleeve portion 651 and the elastic portion 652 is elastic, allowing it to bend under external force and return to its original position when no force is applied. The umbrella-shaped shape means that the elastic portion 652 is inclined outside the threaded sleeve portion 651, and its inclination direction is adapted to the expansion direction of the eccentric cone head 51.

[0054] Furthermore, the transmission screw 62 and the threaded sleeve washer 65 are threaded together, and the threaded sleeve washer 65 is fixedly connected to the turbine housing 532. Thus, when the transmission pin 61 drives the transmission screw 62 to rotate, the threaded action between the transmission screw 62 and the threaded sleeve washer 65 causes the transmission screw 62 to drive the eccentric cone head 51 to move. At the same time, the threaded sleeve washer 65 is subjected to a reverse force, and the elastic part 652 will deform, thereby achieving buffering when the eccentric cone head 51 expands the tube. The threaded sleeve washer 65 has a simple structure and strong functionality. It does not occupy additional space in the mounting cavity 11, allowing more other parts to be accommodated in the already compact mounting cavity 11, which also indirectly reduces the volume of the expander.

[0055] like Figure 6 As shown, the threaded sleeve spring washer 65 needs to be circumferentially fixed in the turbine seat 531. The threaded sleeve spring washer 65 has several notches 66 at its edge. The threaded sleeve spring washer 65 is fixed in the turbine seat 531 by screws and notches 66. In addition, any method that can fix the threaded sleeve spring washer 65 can be applied in this embodiment.

[0056]

Example 3

[0057] Specifically, the ring plate 7 has a taper, which will deform under the action of external force and recover when there is no force. The front and rear ends of the ring plate 7 abut against the retaining ring 631 and the inner wall of the turbine housing 532 respectively. Its tilt direction is adapted to the expansion direction of the eccentric cone head 51. The front end of the transmission screw sleeve 63 is bent to form the retaining ring 631 and extends into the turbine housing 532. The ring plate 7 is sleeved on the outside of the transmission screw sleeve 63 and abuts against the inner wall of the turbine housing 532. When the transmission screw sleeve 63 moves relative to the turbine housing 532, the deformation of the ring plate 7 buffers its movement.

[0058] like Figure 9 and Figure 12 As shown, the transmission sleeve 63 has a limiting part 632 protruding from its circumference. The limiting part 632 is movably engaged in the limiting groove 5321 of the turbine housing 532. The transmission sleeve 63 is limited in the circumference of the turbine housing 532 through the cooperation of the limiting part 632 and the limiting groove 5321.

[0059] like Figure 9 As shown, the inner ring of the ring piece 7 has an opening 71 that is adapted to the shape of the limiting part 632. The opening 71 is used to realize the installation of the ring piece 7. The opening 71 actually increases the inner diameter of the ring piece 7 so that it can be adapted to the transmission screw sleeve 63 with the limiting part 632. The ring piece 7 can be sleeved on the transmission screw sleeve 63 through the opening 71.

[0060] like Figure 9 and Figure 10 As shown, a spring piece 72 is provided at the opening 71. The spring piece 72 can swing under the action of external force. When the ring piece 7 is installed on the transmission screw sleeve 63, the spring piece 72 contacts the limiting part 632 of the transmission screw sleeve 63 and is pushed away by the limiting part 632. After the spring piece 72 is pushed away, it avoids the movement, thereby realizing the installation of the ring piece 7. After the installation is completed, the spring piece 72 will automatically reset. At this time, the ring piece 7 will be locked in the groove 73 formed between the front end of the transmission screw sleeve 63 and the limiting part 632.

[0061]

Example 4

[0062]

Example 5

[0063] Furthermore, the turbine housing 532 has an oblong hole 5322, the transmission screw sleeve 63 has a plug hole 633, and the turbine housing 532 is also provided with a plug rod 634. The plug rod 634 is set in the plug hole 633 through the oblong hole 5322. The plug rod 634 is fixedly set in the plug hole 633 and movably set in the oblong hole 5322. The setting of the plug rod 634, the oblong hole 5322 and the plug hole 633 ensures the circumferential fixation of the transmission screw 62 and the turbine housing 532, while not affecting the relative movement between the transmission screw 62 and the turbine housing 532. In addition, the setting method of this embodiment can be applied to other embodiments.

[0064] 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. An automatic electric pipe expander, characterized in that, include: The housing (1) has a mounting cavity (11) and an expansion cavity (12); A pipe expanding mechanism is disposed within the mounting cavity (11) for expanding the pipe; as well as A locking mechanism (3) is provided inside the expanded tube cavity (12). A clamp assembly is provided inside the locking mechanism (3). The locking mechanism (3) works with the clamp assembly to lock the tube fitting. The tube expansion mechanism includes: The cone assembly (5) includes an eccentric cone (51) and an eccentric base (52); The turbine assembly (53) includes a turbine mount (531) and a turbine housing (532), the turbine housing (532) being fixedly connected to the housing (1), and the turbine mount (531) being rotatably disposed in the mounting cavity (11); the inner wall of the turbine mount (531) is recessed along the traveling direction of the eccentric cone (51) to form a guide groove (5311); The transmission assembly includes a transmission pin (61), a transmission screw (62), a transmission sleeve (63), and an elastic element (64). The transmission pin (61) radially penetrates both the eccentric base (52) and the transmission screw (62), with its outer end extending out of the eccentric base (52) and simultaneously extending into and abutting against the guide groove (5311). The front end of the transmission screw (62) is connected to the eccentric base (52), and the transmission sleeve (63) is fitted over the transmission screw (62) and connected to the turbine housing (532). The transmission pin (61) drives the transmission screw (62) to rotate, and the eccentric cone (51) moves along the expansion direction through the cooperation between the transmission screw (62), the transmission sleeve (63), and the turbine housing (532). The elastic element (64) is fitted over the transmission screw (62) to buffer the impact force of the transmission screw (62) on the turbine housing (532). Drive assembly (54) for rotating turbine mount (531) of turbine assembly (53); The rear end of the transmission screw (62) is provided with a clutch seat (8); The clutch seat (8) is provided with a snap-fit ​​part (81), and the transmission screw sleeve (63) has a snap-fit ​​groove (635) that is adapted to the snap-fit ​​part (81); The transmission sleeve (63) and the turbine box (532) are threadedly connected. The transmission screw (62) drives the transmission sleeve (63) to rotate through the clutch seat (8). Then, through the threaded engagement between the transmission sleeve (63) and the turbine box (532), the eccentric cone (51) is fed. When the expansion tube rotates in place to the eccentric cone head (51), the transmission screw sleeve (63) compresses the elastic element (64) and continues to move along the expansion tube direction until the snap-fit ​​part (81) disengages from the snap-fit ​​groove (635), thereby realizing the engagement and disengagement of the transmission screw sleeve (63). A clutch pin (82) is provided inside the clutch seat (8). The clutch pin (82) passes through both the transmission screw (62) and the clutch seat (8). When the transmission screw (62) rotates, it can drive the clutch seat (8) to rotate. The transmission sleeve (63) and the transmission screw (62) are threadedly connected, and the transmission sleeve (63) is circumferentially confined within the turbine housing (532); the front end of the transmission sleeve (63) is bent to form a retaining ring (631); The elastic element (64) abuts against the retaining ring (631) and the inner wall of the turbine box (532) at its front and rear ends respectively; When the eccentric cone (51) rotates without moving, the transmission screw (62) continues to move and acts on the elastic element (64) to cause it to contract, so as to achieve buffering of the eccentric cone (51) during tube expansion; The elastic element (64) is configured as an umbrella-shaped ring (7), the front end of the transmission screw sleeve (63) extends into the turbine housing (532), the ring (7) is sleeved on the outside of the transmission screw sleeve (63) and abuts against the inner wall of the turbine housing (532); The transmission sleeve (63) has a limiting part (632) protruding from its circumference. The limiting part (632) is movably engaged in the limiting groove (5321) of the turbine housing (532). The transmission sleeve (63) is limited in the circumference of the turbine housing (532) through the cooperation of the limiting part (632) and the limiting groove (5321). The inner ring of the ring piece (7) has an opening (71) in the shape of a fitting limiting part (632), and the opening (71) is used to install the ring piece (7).

2. The automatic electric pipe expander according to claim 1, characterized in that: The transmission assembly also includes a threaded sleeve washer (65), which replaces the transmission threaded sleeve (63) and the elastic element (64); The threaded sleeve spring washer (65) includes a threaded sleeve portion (651) threaded outside the transmission screw (62) and an umbrella-shaped elastic portion (652). The outer edge of the elastic portion (652) abuts against the inner wall of the turbine housing (532) and is circumferentially confined within the turbine housing (532). The connection between the threaded sleeve (651) and the elastic part (652) is elastic and can be deflected under the action of external force.

3. The automatic electric pipe expander according to claim 1, characterized in that: A spring piece (72) is provided at the opening (71), and the spring piece (72) can swing under the action of external force; When the ring piece (7) is installed on the transmission screw sleeve (63), the spring piece (72) contacts the limiting part (632) of the transmission screw sleeve (63) and is pushed away by the limiting part (632) to realize the installation of the ring piece (7). After the installation is completed, the ring piece (7) is engaged in the groove (73) formed between the front end of the transmission screw sleeve (63) and the limiting part (632).

4. An automatic electric pipe expander according to claim 2, characterized in that: The elastic element (64) is configured as a disc spring assembly (74), the front and rear ends of which abut against the retaining ring (631) and the inner wall of the turbine housing (532), respectively; The turbine housing (532) has an oblong hole (5322); the transmission screw sleeve (63) has a plug hole (633); The turbine housing (532) is also provided with a plug rod (634), which is set in the plug hole (633) through the waist-shaped hole (5322) to limit the transmission sleeve (63) to be located in the circumference of the turbine housing (532).

5. An automatic electric pipe expander according to any one of claims 1-4, characterized in that: The locking mechanism (3) includes: The movable part (31) is hinged to the housing (1) in the middle and has a pressing part (32) at the front end. The pressing part (32) is used to press the clamp assembly in the expansion cavity (12) and lock the clamp assembly to the inner wall of the expansion cavity (12). Reset member (33), which is used to ensure that the front end of the movable member (31) always tends to move away from the clamp assembly inside the expansion cavity (12); and The handle (34) is hinged to the housing (1) at its upper end, and a pushing part (35) is provided on the upper edge. The pushing part (35) moves against the rear end of the movable part (31) and is used to drive the movable part (31). The pushing part (35) has an abutting surface (36), which includes a recess (361), a protrusion (362) and a locking part (363) connected in sequence. The distance between the recess (361), the protrusion (362) and the locking part (363) from the hinge point on the housing (1) of the handle (34) increases in sequence. During the clamping of the chuck assembly, the lower end of the movable part (31) sequentially abuts against the recess (361), the protrusion (362), and the locking part (363); When the chuck assembly is locked, the lower end of the movable part (31) is placed inside the locking part (363).

6. An automatic electric pipe expander according to claim 5, characterized in that: The housing (1) is provided with a movable pin (37), and the middle part of the movable part (31) is hinged to the housing (1) by the movable pin (37); The lower end of the movable part (31) is provided with a mounting groove (38), and an abutment wheel (39) is rotatably arranged in the mounting groove (38); The abutting wheel (39) abuts against the abutting surface (36) of the handle (34).

7. An automatic electric pipe expander according to claim 6, characterized in that: The expansion cavity (12) is provided with a number of positioning pins (44), and the side wall of the clamp assembly is provided with positioning grooves (45) adapted to the positioning pins (44). When the chuck assembly is placed in the set position, the positioning pin (44) is placed in the positioning groove (45).

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