Automatic electric pipe expander

Abstract

The technical scheme belongs to the technical field of pipe expanders, and particularly relates to an automatic electric pipe expander which comprises a shell, an electric pipe expander, a driving device and a driving device, and the shell is provided with a mounting cavity and a pipe expanding cavity; the pipe expanding mechanism is arranged in the mounting cavity; and a lockset mechanism. The pipe expanding mechanism comprises a conical head assembly, a turbine assembly; the transmission assembly comprises a transmission pin, a transmission screw rod, a transmission screw sleeve and an elastic piece, the transmission pin radially penetrates through the eccentric base and the transmission screw rod at the same time, and the outer end of the transmission pin penetrates out of the eccentric base and extends into and abuts against the interior of the turbine assembly at the same time; the front end of the transmission screw is connected with the conical head assembly, and the transmission screw sleeve is arranged outside the transmission screw in a sleeving mode and connected and matched with the turbine assembly. The transmission pin is used for driving the transmission screw to rotate, and the conical head assembly moves in the pipe expanding direction through cooperation of the transmission screw, the transmission screw sleeve and the turbine assembly. The elastic piece is arranged outside the transmission screw in a sleeving mode and used for buffering the impact force of the transmission screw on the turbine assembly. And a drive assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe expanders, and in particular to an automatic electric pipe expander. Background Art

[0002] Electric tube expander is a device that squeezes and expands one end of a pipe fitting. The pipe fitting can be a plastic pipe or a thin metal pipe. Electric tube expander is widely used in the petroleum, chemical, electric power, metallurgy, shipbuilding, refrigeration and other industries. It is used for the manufacture and maintenance of boilers, heat exchangers, condensers, coolers and other types of pressure vessels.

[0003] Chinese patent CN118543753A discloses an electric pipe expander. The guide groove of the turbine body drives the first positioning rod to rotate through the transmission shaft, and then drives the first positioning member to rotate, thereby realizing the movement of the eccentric base. This transmission method is relatively complex and involves many components, which leads to low transmission efficiency. In addition, the electric pipe expander of this application also has no components for buffering. Summary of the Invention

[0004] The purpose of this technical solution is to provide an automatic electric pipe expander, which solves the problem of complex transmission structure and lack of buffering of the original pipe expander by improving the transmission component structure in the pipe expanding mechanism and adding components for buffering and clutching.

[0005] The purpose of this technical solution is achieved in this way:

[0006] An automatic electric pipe expander comprises: a housing having a mounting cavity and a pipe expansion cavity; a pipe expansion mechanism arranged in the mounting cavity for expanding the pipe; and a locking mechanism arranged in the pipe expansion cavity, wherein a chuck assembly is arranged in the locking mechanism, and the locking mechanism cooperates with the chuck assembly to lock the pipe fitting; wherein the pipe expansion mechanism comprises: a cone head assembly comprising an eccentric cone head and an eccentric base; a turbine assembly comprising a turbine seat and a turbine box, the turbine box being fixedly connected to the housing, the turbine seat being rotatably arranged in the mounting cavity; an inner wall of the turbine seat being recessed along the travel direction of the eccentric cone head to form a guide groove; a transmission assembly comprising It includes a transmission pin, a transmission screw, a transmission nut and an elastic part. The transmission pin radially penetrates the eccentric base and the transmission screw at the same time, and the outer end passes through the eccentric base, and at the same time extends into and rests on the guide groove; the front end of the transmission screw is connected to the eccentric base, and the transmission nut is sleeved outside the transmission screw and connected and cooperated with the turbine box; the transmission pin is used to drive the transmission screw to rotate, and the eccentric cone head is moved along the pipe expansion direction through the cooperation between the transmission screw, the transmission nut and the turbine box; the elastic part is sleeved outside the transmission screw to buffer the impact force of the transmission screw on the turbine box; and a drive assembly, which is used to drive the turbine seat of the turbine assembly to rotate.

[0007] Preferably, the transmission assembly also includes a screw sleeve spring washer, which replaces the transmission screw sleeve and the elastic member; the screw sleeve spring washer includes a screw sleeve portion threadedly sleeved on the outside of the transmission screw and an umbrella-shaped elastic portion, the outer edge of the elastic portion abuts against the inner wall of the turbine box and is circumferentially confined in the turbine box; the connection between the screw sleeve portion and the elastic portion is elastic and can be deflected under the action of external force.

[0008] Preferably, the transmission nut and the transmission screw are threadedly connected, and the transmission nut is circumferentially confined in the turbine box; the front end of the transmission nut is bent to form a retaining ring; the front and rear ends of the elastic member abut the retaining ring and the inner wall of the turbine box respectively; when the eccentric cone head rotates without moving, the transmission screw continues to move and acts on the elastic member to contract it, so as to achieve buffering of the eccentric cone head during pipe expansion; the elastic member is configured as an umbrella-shaped ring piece, the front end of the transmission nut extends into the turbine box, and the ring piece is sleeved on the outside of the transmission nut and abuts the inner wall of the turbine box.

[0009] Preferably, a limiting portion is provided on the circumferential side of the transmission screw sleeve, and the limiting portion is movably engaged in the limiting groove of the turbine box. The transmission screw sleeve is limited in the circumferential direction of the turbine box through the cooperation of the limiting portion and the limiting groove; the inner ring of the ring plate has an opening that is adapted to the shape of the limiting portion, and the opening is used to realize the installation of the ring plate.

[0010] Preferably, a spring piece is provided at the opening, and the spring piece 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 away by the limiting part to realize the installation of the ring piece, and after the installation is completed, the ring piece is clamped in the groove formed between the front end of the transmission screw sleeve and the limiting part.

[0011] Preferably, the elastic member is configured as a disc spring group, the front and rear ends of the disc spring group respectively abut against the retaining ring and the inner wall of the turbine box; a waist-shaped hole is provided on the turbine box; a plug-in hole is provided on the transmission nut; the turbine box is also provided with a plug-in rod, and the plug-in rod is arranged in the plug-in hole through the waist-shaped hole to realize the limitation of the transmission nut being located within the circumference of the turbine box.

[0012] Preferably, a clutch seat is provided at the rear end of the transmission screw; a clamping portion is provided on the clutch seat, and a clamping groove adapted to the clamping portion is provided on the transmission nut; the transmission nut and the turbine box are threadedly connected, and the transmission screw drives the transmission nut to rotate through the clutch seat, and the feeding of the eccentric cone head is realized through the threaded cooperation between the transmission nut and the turbine box; when the pipe is expanded to the point where the eccentric cone head rotates in place, the transmission nut compression elastic member continues to move in the direction of pipe expansion until the clamping portion disengages from the clamping groove, thereby realizing the clutch of the transmission nut.

[0013] Preferably, the locking mechanism includes: a movable part, a lower portion of which is hinged on the shell and a pressing part is provided at the front end, the pressing part is used to press the clamp assembly in the expansion cavity and lock the clamp assembly on the inner wall of the expansion cavity; a reset part, which is used to make the front end of the movable part always have a tendency to move away from the clamp assembly in the expansion cavity; and a handle, an upper end of which is hinged on the shell and a pushing part is provided at the upper end edge, the pushing part movably abuts the rear end of the movable part and is used to drive the movable part; wherein the pushing part has an abutting surface, which includes a recessed portion, a convex portion and a locking portion connected in sequence, and the distance between the recessed portion, the convex portion and the locking portion is increased in sequence from the hinge point of the handle on the shell; in the process of clamping the clamp assembly, the lower end of the movable part abuts the recessed portion, the convex portion and the locking portion in sequence; when the clamp assembly is locked, the lower end of the movable part is placed in the locking portion.

[0014] Preferably, a movable pin is provided on the shell, and the middle part of the movable part is hinged to the shell through the movable pin; a mounting groove is provided at the lower end of the movable part, and an abutment wheel is rotatably provided in the mounting groove; the abutment wheel abuts against the abutment surface of the handle.

[0015] Preferably, a plurality of positioning pins are provided in the tube expansion cavity, and positioning grooves adapted for the positioning pins are provided on the side wall of the chuck assembly; when the chuck assembly is placed in a set position, the positioning pins are placed in the positioning grooves.

[0016] Compared with the existing technology, this technical solution has the following outstanding and beneficial technical effects:

[0017] 1. The transmission assembly designed in this technical solution is used to transmit the power input by the drive assembly to the cone head assembly, and is also used to buffer the impact force of the transmission screw on the turbine box. The transmission assembly only includes three transmission parts and one elastic part. The transmission pin is movably engaged in the guide groove of the turbine seat and is 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 arranged in the eccentric base, and the transmission screw sleeve is movably arranged on the turbine box and cooperates with the transmission screw thread at the same time to realize the movement of the eccentric base along the pipe expansion direction. The elastic part is sleeved outside the transmission screw, which can buffer the impact force of the transmission screw on the turbine box when the eccentric cone head expands the pipe. The overall structure of the transmission assembly is simple, the number of parts is small, and the transmission efficiency is high.

[0018] 2. A clutch seat is also provided between the transmission assembly and the cone head assembly designed in this technical solution. The clutch seat and the transmission screw sleeve cooperate with each other to achieve limited movement of the eccentric cone head during feeding. When the pipe 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, thus ensuring that the pipe will not be damaged due to excessive expansion.

[0019] 3. The middle part of the movable part of the locking mechanism designed in this technical solution is hinged on the shell, and after its lower end is driven by the handle, the upper end moves toward the chuck assembly placed in the expansion cavity to achieve locking of the chuck assembly. The handle can directly drive the movable part to rotate, and the transmission effect is stable. No extra components are required to cooperate, and the structure is simple. The abutting surface of the handle includes a recessed portion, a convex portion and a locking portion, and the distances between the recessed portion, the convex portion and the locking portion and the hinge point of the handle on the shell increase successively. In the process of clamping the chuck assembly, the lower end of the movable part abuts the recessed portion, the convex portion and the locking portion successively. In the process of the movable part abutting from the recessed portion to the convex portion, the movable part can respond quickly and clamp the chuck assembly quickly. When the movable part abuts the locking portion, the state of the movable part is more stable, ensuring that the chuck assembly will not loosen during tube expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural diagram of Example 1.

[0021] Figure 2 This is a schematic diagram of the structure of the drive assembly and the turbine assembly in Example 1.

[0022] Figure 3 This is a cross-sectional view of the pipe expansion mechanism in Example 1.

[0023] Figure 4 This is a schematic structural diagram of the clutch seat and the transmission screw sleeve in Example 1.

[0024] Figure 5 This is a cross-sectional view of the pipe expansion mechanism in Example 2.

[0025] Figure 6 This is a schematic diagram of the structure of the elastic member and the turbine housing in Example 2.

[0026] Figure 7 This is a schematic structural diagram of the elastic member in Example 2.

[0027] Figure 8 This is a schematic diagram of the structure of the elastic member, transmission screw sleeve and turbine box in Example 3.

[0028] Figure 9 Schematic diagram of the structure of the elastic member and the transmission screw sleeve in Example 3.

[0029] Figure 10 This is a cross-sectional view of the coordination of the elastic member, the transmission screw sleeve and the turbine housing in Example 3.

[0030] Figure 11 This is a cross-sectional view of some components in Example 4.

[0031] Figure 12 This is a schematic diagram of the structure of some components in Example 4.

[0032] Figure 13 This is a cross-sectional view of some components in Example 5.

[0033] Figure 14 This is a schematic diagram of the structure of some components in Example 5.

[0034] Figure 15 Schematic diagram of the internal structure of the chuck mechanism.

[0035] Figure 16 This is an exploded view of the chuck mechanism.

[0036] Figure 17 A cross-sectional view of the chuck mechanism.

[0037] Figure 18 It is a structural diagram when the movable part abuts against the locking part.

[0038] Figure 19 It is a structural diagram when the movable part abuts against the convex part.

[0039] Figure 20 It is a structural diagram when the movable part abuts against the recessed part.

[0040] Figures: 1, housing; 11, mounting cavity; 12, expansion cavity; 3, locking mechanism; 31, movable member; 32, pressing portion; 33, reset member; 34, handle; 35, pushing portion; 36, abutting surface; 361, recessed portion; 362, convex portion; 363, locking portion; 37, movable 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 head assembly; 51, eccentric cone head; 52, eccentric base; 53, turbine assembly; 531, turbine seat; 5311, guide groove; 5 32. Turbine box; 5321. Limiting groove; 5322. Waist-shaped hole; 54. Drive assembly; 541. Drive member; 542. Output screw; 61. Transmission pin; 62. Transmission screw; 63. Transmission screw sleeve; 631. Retaining ring; 632. Limiting portion; 633. Connecting hole; 634. Connecting rod; 635. Snap-fit groove; 64. Elastic member; 65. Screw sleeve spring washer; 651. Screw sleeve portion; 652. Elastic portion; 66. Notch; 7. Ring; 71. Opening; 72. Spring piece; 73. Snap-fit groove; 74. Disc spring assembly; 8. Clutch seat; 81. Connecting portion; 82. Clutch pin. DETAILED DESCRIPTION

[0041] The specific implementation of the technical solution is further described in detail below with reference to the accompanying drawings.

[0042] [Example 1]

[0043] like Figure 1 and Figure 2As shown, an automatic electric pipe expander includes a shell 1, a pipe expanding mechanism, a locking mechanism 3 and a chuck assembly. The shell 1 has a mounting cavity 11 located inside it and a pipe expanding cavity 12 located at the front end of its outer side. The mounting cavity 11 is used to place the working parts of the pipe expanding mechanism, and the pipe expanding cavity 12 is used to place the pipe to be expanded. After the pipe to be expanded is placed in the chuck assembly and then the chuck assembly is placed in the pipe expanding cavity 12, the chuck assembly can be locked by the locking mechanism 3 to fix the pipe to be expanded, and then the pipe expanding mechanism can be driven to perform the pipe expanding work. The locking mechanism 3 can increase the stability during pipe expansion to improve the processing quality.

[0044] Specifically, the pipe expansion mechanism includes a cone head 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 expansion. It can provide electricity through a battery or provide power through a connected wire. The drive assembly 54 first drives the turbine box 532 of the turbine assembly 53 to rotate. After the turbine box 532 rotates, it drives the transmission assembly to rotate. After the transmission assembly rotates, it drives the cone head assembly 5 to rotate and move, thereby achieving pipe expansion.

[0045] like Figure 3 As shown, the driving assembly 54 includes a driving member 541 and an output screw 542 arranged at its output end. The driving member 541 is a driving motor. The output screw 542 can be driven by the driving 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 a thread on its circumference and is located next to the turbine assembly 53. The thread 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 head assembly 5 to work through the transmission assembly.

[0046] The cone head assembly 5 includes an eccentric base 52 and an eccentric cone head 51. The eccentric cone head 51 is arranged on the eccentric base 52. A sleeve and a plane bearing are arranged between the eccentric cone head 51 and the eccentric base 52. The sleeve and the plane bearing are both sleeved on the outside of the eccentric cone head 51. The sleeve rests on the eccentric base 52. The plane bearing is located at the front end of the sleeve. The sleeve and the plane bearing are used together to buffer the impact force between the eccentric cone head 51 and the eccentric base 52, so as to reduce equipment wear and increase its service life.

[0047] The turbine assembly 53 is used to receive the power provided by the driving assembly 54 and transmit power. The turbine assembly 53 includes a turbine box 532 and a turbine seat 531 rotatably arranged in the turbine box 532. The turbine box 532 is fixedly connected to the housing 1 by bolts. The turbine seat 531 has teeth on the circumference that are compatible with 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 also to provide space for the transmission pin 61 to move.

[0048] The transmission assembly is used to change the rotational power of the turbine seat 531 into 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 screw sleeve 63 and an elastic member 64. The transmission pin 61 radially penetrates the eccentric base 52 and the transmission screw 62 at the same time, that is, the middle section of the transmission pin 61 is inserted into the eccentric base 52 and the transmission screw 62. In this way, when the transmission pin 61 rotates, the eccentric base 52 and the transmission screw 62 can be driven to rotate at the same time. The two ends of the transmission pin 61 pass through the eccentric base 52 and extend into and abut against the guide groove 5311 of the turbine seat 531. In this way, when the turbine seat 531 is rotated, the eccentric base 52 and the transmission screw 62 can be driven to rotate at the same time. When the wheel seat 531 rotates, it will drive 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 sleeved with a transmission screw sleeve 63. The circumference of the transmission screw 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 screw sleeve 63 can be rotated. At the same time, through the thread action between the transmission screw sleeve 63 and the turbine box 532, the eccentric cone head 51 can be moved along the travel direction. At the same time, the transmission pin 61 can also drive the eccentric cone head 51 to rotate through the eccentric base 52, thereby realizing the rotation of the eccentric cone head 51 when it moves.

[0049] 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 screw sleeve 63 is located at the front end of the clutch seat 8. The transmission screw sleeve 63 and the turbine box 532 are threadedly connected. A clutch pin 82 is provided in the clutch seat 8. The clutch pin 82 penetrates the transmission screw 62 and the clutch seat 8 at the same time. In this way, when the transmission screw 62 rotates, the clutch seat 8 can be driven to rotate. A clamping portion 81 is provided on the clutch seat 8, and a clamping groove 635 adapted to the clamping portion 81 is provided on the transmission screw sleeve 63. When the pipe is not expanded, the clamping portion 81 is placed in the clamping groove 635. When the pipe expansion starts, the transmission screw sleeve 63 and the clutch seat 8 rotate and move synchronously through the action between the clamping portion 81 and the clamping groove 635. When the pipe is expanded, When the eccentric cone head 51 rotates but does not move, the clutch seat 8 is still rotating but not moving. Since there is still space for movement at the front end of the transmission screw sleeve 63, the transmission screw sleeve 63 will compress the elastic member 64 to continue moving until the clamping portion 81 disengages from the clamping groove 635. During this period of time, the elastic member 64 can effectively buffer the radial impact force of the transmission screw sleeve 63 on the turbine seat 531. The elastic member 64 is also used to make the transmission screw sleeve 63 have a tendency to always move toward the clutch seat 8. When the clamping portion 81 disengages from the clamping groove 635, the clutch seat 8 is still rotating, and the transmission screw sleeve 63 stops rotating, so it will not continue to push the eccentric cone head 51 to move, thereby realizing clutch, which can effectively prevent excessive pipe expansion.

[0050] like Figure 15-17 As shown, the locking mechanism 3 includes a movable part 31, a reset part 33 and a handle 34. The movable part 31 is used to lock the chuck assembly through its own movement. The lower part is hinged on the shell 1, and the front end is provided with a pressing part 32. The pressing part 32 movably abuts the side wall of the chuck assembly. The reset part 33 is used to make the pressing part 32 always have a movement tendency away from the chuck assembly. The handle 34 is used to input rotational power to the movable part 31. The upper end of the movable part is hinged on the shell 1, and the upper end edge is provided with a pushing part 35. The pushing part 35 movably abuts the rear end of the movable part 31. When the chuck assembly is located in the expansion cavity 12, the handle 34 is rotated, and under the action of the pushing part 35, the rear end of the movable part 31 is pushed to move, so that the front end of the movable part 31 presses the chuck assembly in the expansion cavity 12, and cooperates with the inner wall of the expansion cavity 12 to lock the chuck assembly.

[0051] The locking portion 363 can limit the rear end of the movable member 31 so as to ensure that the chuck 31 is firmly fixed on the chuck 31, thereby greatly improving the stability of the chuck 31.

[0052] Furthermore, if Figure 18-20 As shown, since the distances between the concave portion 361, the convex portion 362 and the locking portion 363 and the hinge point of the handle 34 on the housing 1 increase in sequence, the movable member 31 can be rotated when the handle 34 rotates. Figure 8 This is a structural diagram when the movable part abuts against the locking part 363. At this time, the front end of the movable part 31 has not yet entered the expansion cavity 12. Figure 9 This is a structural diagram when the movable part abuts against the convex part 362. At this time, the movable part 31 starts to rotate, enters the expansion cavity 12 and moves towards the chuck assembly. Figure 20 It is a structural diagram when the movable part is in contact with the recess 361 . At this time, the movable part 31 has cooperated with the inner wall of the housing 1 to lock the clamp assembly, and also realizes its own clamping.

[0053] like Figure 15-17 As shown, a movable pin 37 is provided on the shell 1, and the middle part of the movable part 31 is hinged to the shell 1 through the movable pin 37. A mounting groove 38 is provided at the lower end of the movable part 31, and an abutment wheel 39 is rotatably provided in the mounting groove 38. The abutment wheel 39 abuts against the abutment surface 36 of the handle 34. The reset member 33 is configured as a torsion spring, which is sleeved on the movable pin 37, and the two ends are respectively connected to the shell 1 and the movable part 31. When the handle 34 releases force, the torsion spring can drive the movable pin 37 to reset, so that it abuts in the recess 361, ready to expand the tube again.

[0054] 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 protruding from the upper end of the movable part 31, and the protrusion movably abuts 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. A number of positioning pins 44 are provided in the expansion tube cavity 12, and a positioning groove 45 for adapting the positioning pin 44 is provided on the side wall of the chuck. When the chuck assembly is placed in the set position, the positioning pin 44 is placed in the positioning groove 45. The cooperation of the positioning pin 44 and the positioning groove 45 is used to achieve fixation along the insertion direction of the chuck assembly.

[0055] [Example 2]

[0056] The configuration of this embodiment is substantially the same as that of embodiment 1, except for the structure of the elastic member 64. Figure 5-7 As shown, in this embodiment, the transmission assembly also includes a screw sleeve spring washer 65, which replaces the transmission screw sleeve 63 and the elastic member 64. That is, transmission is achieved through the action between the transmission screw 62, the screw sleeve spring washer 65 and the turbine box 532, and the transmission screw sleeve 63 and the elastic member 64 are combined into one part.

[0057] Specifically, the screw sleeve spring washer 65 includes a screw sleeve portion 651 threadedly sleeved on the outside of 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 box 532 and is circumferentially confined within the turbine box 532. The connection between the screw sleeve portion 651 and the elastic portion 652 is elastic, which can be deflected under the action of external force and can also be reset when there is no force. The umbrella shape means that the elastic portion 652 is tilted outside the screw sleeve portion 651, and its tilt direction is adapted to the expansion direction of the eccentric cone head 51.

[0058] Furthermore, the transmission screw 62 and the screw sleeve spring washer 65 are threadedly connected, and the screw sleeve spring washer 65 and the turbine box 532 are fixedly connected. In this way, when the transmission pin 61 drives the transmission screw 62 to rotate, the threaded action between the transmission screw 62 and the screw sleeve spring washer 65 will cause the transmission screw 62 to drive the eccentric cone head 51 to move, and at the same time the screw sleeve spring washer 65 will be subjected to a reverse force. At this time, the elastic portion 652 will be deformed, thereby achieving buffering when the eccentric cone head 51 expands the pipe. The screw sleeve spring washer 65 has a simple structure and strong functionality. It does not occupy additional space in the installation cavity 11, so that more other parts can be accommodated in the already compact installation cavity 11, and the volume of the pipe expander is also reduced in a direction when used.

[0059] like Figure 6As shown, the screw sleeve spring washer 65 needs to be fixed circumferentially in the turbine seat 531. There are several notches 66 at the edge of the screw sleeve spring washer 65. The screw sleeve spring washer 65 is fixed in the turbine seat 531 by screws and notches 66. In addition, any method that can fix the screw sleeve spring washer 65 can be applied in this embodiment.

[0060] [Example 3]

[0061] The configuration of this embodiment is substantially the same as that of embodiment 1, except for the structure of the elastic member 64. Figure 8-10 As shown, in this embodiment, the transmission screw sleeve 63 and the elastic member 64 are separately arranged, the elastic member 64 is configured as an umbrella-shaped ring piece 7, the transmission screw sleeve 63 and the transmission screw 62 are threadedly connected, and the transmission screw sleeve 63 is circumferentially limited in the turbine box 532. When the eccentric cone head 51 rotates without moving, the transmission screw 62 will continue to rotate and move. The movement of the transmission screw 62 will act on the ring piece 7 to cause it to contract, so as to achieve buffering of the eccentric cone head 51 during pipe expansion.

[0062] Specifically, the ring piece 7 has a taper, which will deform under the action of external force and restore when there is no force. The front and rear ends of the ring piece 7 respectively abut the retaining ring 631 and the inner wall of the turbine box 532, and its inclination 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 a retaining ring 631 and extends into the turbine box 532. The ring piece 7 is sleeved on the outside of the transmission screw sleeve 63 and abuts the inner wall of the turbine box 532. When the transmission screw sleeve 63 moves relative to the turbine box 532, the ring piece 7 deforms to achieve buffering of its movement.

[0063] like Figure 9 and Figure 12 As shown, a limiting portion 632 is protruded from the circumferential side of the transmission screw sleeve 63, and the limiting portion 632 is movably engaged in the limiting groove 5321 of the turbine box 532. The transmission screw sleeve 63 is limited in the circumferential direction of the turbine box 532 through the cooperation of the limiting portion 632 and the limiting groove 5321.

[0064] 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 portion 632. The opening 71 is used to install the ring piece 7. The opening 71 actually increases the inner diameter of the ring piece 7 so that it is adapted to the transmission screw sleeve 63 with the limiting portion 632. The ring piece 7 can be placed on the transmission screw sleeve 63 through the opening 71.

[0065] like Figure 9 and Figure 10As shown, a spring piece 72 is provided at the opening 71, and the spring piece 72 can be deflected 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 portion 632 of the transmission screw sleeve 63 and is pushed away by the limiting portion 632. After the spring piece 72 is pushed away, it is avoided, thereby realizing the installation of the ring piece 7. After the installation is completed, the spring piece 72 will automatically reset, and at this time the ring piece 7 will be clamped in the clamping groove 73 formed between the front end of the transmission screw sleeve 63 and the limiting portion 632.

[0066] [Example 4]

[0067] The configuration of this embodiment is substantially the same as that of embodiment 3, except for the structure of the elastic member 64. Figure 11 and Figure 12 As shown, the elastic member 64 is configured as a cylindrical washer, which deforms when compressed and automatically recovers when no force is applied. It has a tendency to recover at all times after being compressed, and is also used to buffer the expansion of the eccentric cone head 51.

[0068] [Example 5]

[0069] The configuration of this embodiment is substantially the same as that of embodiment 4, except for the structure of the elastic member 64. Figure 13 and Figure 14 As shown, the elastic member 64 is configured as a disc spring group 74, and the front and rear ends of the disc spring group 74 respectively abut against the retaining ring 631 and the inner wall of the turbine box 532.

[0070] Furthermore, a waist-shaped hole 5322 is provided on the turbine box 532, a plug-in hole 633 is provided on the transmission screw sleeve 63, and the turbine box 532 is also provided with a plug-in rod 634. The plug-in rod 634 is arranged in the plug-in hole 633 through the waist-shaped hole 5322. The plug-in rod 634 is fixedly arranged in the plug-in hole 633 and movably arranged in the waist-shaped hole 5322. The arrangement of the plug-in rod 634, the waist-shaped hole 5322 and the plug-in hole 633 ensures the circumferential fixation of the transmission screw 62 and the turbine box 532 without affecting the relative movement between the transmission screw 62 and the turbine box 532. In addition, the arrangement method of this embodiment can be applied to the other embodiments.

[0071] The above shows and describes the basic principles and main features of the present technical solution and the advantages of the present technical solution. Those skilled in the art should understand that the present technical solution is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present technical solution. Various changes and improvements may be made to the present technical solution without departing from the spirit and scope of the present technical solution. Such changes and improvements fall within the scope of the present technical solution for which protection is sought. The scope of protection claimed by the present technical solution is defined by the appended claims and their equivalents.

Claims

1. An automatic electric pipe expander, characterized in that: include: A housing (1) having a mounting cavity (11) and a tube expansion cavity (12); a pipe expansion mechanism, which is arranged in the installation cavity (11) and is used for expanding the pipe; as well as A locking mechanism (3) is arranged in the tube expansion cavity (12), a chuck assembly is arranged in the locking mechanism (3), and the locking mechanism (3) cooperates with the chuck assembly to lock the pipe; Wherein, the pipe expansion mechanism includes: A cone head assembly (5), comprising an eccentric cone head (51) and an eccentric base (52); A turbine assembly (53) comprises a turbine seat (531) and a turbine box (532), wherein the turbine box (532) is fixedly connected to the housing (1), and the turbine seat (531) is rotatably arranged in the mounting cavity (11); 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); A transmission assembly, comprising a transmission pin (61), a transmission screw (62), a transmission screw sleeve (63) and an elastic member (64), wherein the transmission pin (61) radially penetrates the eccentric base (52) and the transmission screw (62) at the same time, and the outer end thereof passes through the eccentric base (52) and extends into and abuts against the guide groove (5311); the front end of the transmission screw (62) is connected to the eccentric base (52), the transmission screw sleeve (63) is sleeved outside the transmission screw (62) and is connected and matched with the turbine box (532); the transmission pin (61) is used to drive the transmission screw (62) to rotate, and the eccentric cone head (51) is moved along the pipe expansion direction through the cooperation between the transmission screw (62), the transmission screw sleeve (63) and the turbine box (532); the elastic member (64) is sleeved outside the transmission screw (62) and is used to buffer the impact force of the transmission screw (62) on the turbine box (532); and The driving assembly (54) is used to drive the turbine seat (531) of the turbine assembly (53) to rotate.

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

3. The automatic electric pipe expander according to claim 1, characterized in that: The transmission screw sleeve (63) and the transmission screw (62) are threadedly connected, and the transmission screw sleeve (63) is circumferentially confined within the turbine housing (532); the front end of the transmission screw sleeve (63) is bent to form a retaining ring (631); The front and rear ends of the elastic member (64) respectively abut against the retaining ring (631) and the inner wall of the turbine box (532); When the eccentric cone head (51) rotates but does not move, the transmission screw (62) continues to move and acts on the elastic member (64) to shrink it, thereby achieving buffering of the eccentric cone head (51) during pipe expansion; The elastic member (64) is configured as an umbrella-shaped ring piece (7), the front end of the transmission screw sleeve (63) extends into the turbine box (532), and the ring piece (7) is sleeved outside the transmission screw sleeve (63) and abuts against the inner wall of the turbine box (532).

4. The automatic electric pipe expander according to claim 3, characterized in that: A limiting portion (632) is provided on the circumferential side of the transmission screw sleeve (63), and the limiting portion (632) is movably engaged in the limiting groove (5321) of the turbine housing (532). The transmission screw sleeve (63) is limited in the circumferential direction of the turbine housing (532) by the cooperation between the limiting portion (632) and the limiting groove (5321); The inner ring of the ring piece (7) has an opening (71) in the shape of an adaptable limiting portion (632), and the opening (71) is used to achieve the installation of the ring piece (7).

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

6. The automatic electric pipe expander according to claim 2, characterized in that: The elastic member (64) is configured as a disc spring group (74), and the front and rear ends of the disc spring group (74) respectively abut against the retaining ring (631) and the inner wall of the turbine box (532); The turbine box (532) is provided with a waist-shaped hole (5322); the transmission screw sleeve (63) is provided with a plug-in hole (633); The turbine box (532) is further provided with a plug rod (634), and the plug rod (634) is arranged in the plug hole (633) through the waist-shaped hole (5322) to achieve the limitation of the transmission screw sleeve (63) being located within the circumference of the turbine box (532).

7. The automatic electric pipe expander according to claim 1, characterized in that: A clutch seat (8) is provided at the rear end of the transmission screw (62); The clutch seat (8) is provided with a clamping portion (81), and the transmission screw sleeve (63) is provided with a clamping groove (635) adapted to the clamping portion (81); The transmission screw sleeve (63) and the turbine housing (532) are threadedly connected, and the transmission screw (62) drives the transmission screw sleeve (63) to rotate through the clutch seat (8), and the feeding of the eccentric cone head (51) is achieved through the threaded engagement between the transmission screw sleeve (63) and the turbine housing (532); When the pipe is expanded until the eccentric cone head (51) rotates in place, the transmission screw sleeve (63) compresses the elastic member (64) and continues to move along the pipe expansion direction until the clamping portion (81) is disengaged from the clamping groove (635), thereby achieving the clutch of the transmission screw sleeve (63).

8. An automatic electric pipe expander according to any one of claims 1 to 7, characterized in that: The locking mechanism (3) comprises: A movable member (31) is hinged at its middle portion to the housing (1), and is provided with a pressing portion (32) at its front end, the pressing portion (32) being used to press the chuck assembly in the expansion cavity (12) and lock the chuck assembly to the inner wall of the expansion cavity (12); a reset member (33) for ensuring that the front end of the movable member (31) always has a tendency to move away from the clamp assembly in the expansion cavity (12); and A handle (34) whose upper end is hinged to the housing (1) and whose upper edge is provided with a pushing portion (35), the pushing portion (35) movably abuts against the rear end of the movable member (31) and is used to drive the movable member (31); The pushing portion (35) has an abutting surface (36), the abutting surface (36) comprising a recessed portion (361), a convex portion (362), and a locking portion (363) connected in sequence, wherein the recessed portion (361), the convex portion (362), and the locking portion (363) are located at increasing distances from a hinge point of the handle (34) on the housing (1); During the process of clamping the chuck assembly, the lower end of the movable member (31) abuts against the recess (361), the protrusion (362) and the locking portion (363) in sequence; When the clamp assembly is locked, the lower end of the movable member (31) is placed in the locking portion (363).

9. The automatic electric pipe expander according to claim 8, characterized in that: A movable pin (37) is provided on the housing (1), and the middle portion of the movable member (31) is hinged to the housing (1) via the movable pin (37); The lower end of the movable member (31) is provided with a mounting groove (38), and 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).

10. The automatic electric pipe expander according to claim 9, characterized in that: A plurality of positioning pins (44) are provided in the tube expansion cavity (12), and positioning grooves (45) adapted to fit the positioning pins (44) are provided on the side wall of the chuck assembly; When the clamp assembly is placed in the set position, the positioning pin (44) is placed in the positioning groove (45).

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