tube expander

Abstract

The technical scheme discloses a pipe expander, which comprises a motor, a cam, an expansion head, and a rotary driving mechanism. The motor is an integrated motor with a core and an end cover. The end cover is located at both sides of the core, and the diameter of the end cover is close to that of the core. The cam has a gear at a position matched with the rotary driving mechanism. The rotary driving mechanism has a linkage wheel, a ball, a trip wheel, a pressing plate, an elastic bowl, a linkage shaft, a base, and a linkage gear. The linkage wheel has a gear cavity matched with the gear. The outer side of the linkage wheel towards the trip wheel has a ball cavity. The trip wheel has a ball hole at a corresponding position. The ball is arranged in the ball cavity and the ball hole, and is between the linkage wheel and the trip wheel. The technical scheme solves the technical problem of optimizing the internal space of the pipe expander and avoiding damage to the machine caused by internal torsion.

Description

TECHNICAL FIELD

[0001] The present application relates to a pipe expander, in particular to a pipe expander using an integrated motor and a trip protection. BACKGROUND

[0002] The pipe expander is a kind of pipe expander, which uses a cam to drive the main shaft to do forward and backward extension action, and the main shaft drives the expansion head to do outward expansion action.

[0003] The current pipe expander mainly designs the shell, battery, motor, cam, main shaft, expansion head, rotating drive mechanism and other components, wherein the motor adopts a split type motor, which occupies a large space, if an integrated motor is used in the market, the occupied space is relatively smaller than the split type motor, but there is still room for improvement. At the same time, the current rotating drive mechanism mainly drives the rotating cylinder to rotate and in turn drives the expansion head to rotate intermittently at a certain frequency, such as 15 degrees. The rotating drive structure does not have a corresponding protection structure, such as too much external force, internal torque cannot be output, and too much torque can easily damage the machine. SUMMARY

[0004] The purpose of the present application is to provide a pipe expander, which solves the technical problem of optimizing the internal space of the pipe expander and avoiding damage to the machine due to internal torque.

[0005] The pipe expander comprises a motor, a cam, an expansion head and a rotating drive mechanism. The motor is an integrated motor having a core and an end cover, and the diameter of the end cover is close to that of the core. The cam has a gear tooth at the position matched with the rotating drive mechanism. The rotating drive mechanism has a linkage wheel, a ball, a trip wheel, a pressing sheet, an elastic bowl, a linkage shaft, a base and a linkage tooth. The linkage wheel has a gear cavity matched with the gear tooth, and the outer side of the linkage wheel facing the trip wheel has a ball cavity. The trip wheel has a ball hole at the corresponding position, and the ball is arranged in the ball cavity and the ball hole. The ball is between the linkage wheel and the trip wheel. One side of the pressing sheet is attached to the side of the trip wheel, and the other side of the pressing sheet is matched with the elastic bowl. The linkage wheel, the trip wheel, the pressing sheet and the elastic bowl are all sleeved on the linkage shaft. The base has a rotating hole, and the two bases are matched with the linkage shaft through the rotating hole. The linkage tooth is arranged on the linkage shaft and is engaged with the rotating cylinder of the pipe expander. The rotating cylinder is matched with the expansion head.

[0006] The end cover is a first end cover mechanism and a second end cover mechanism; the first end cover mechanism is designed with a first outer cover body and a first inner cover body; the second end cover mechanism is designed with a second outer cover body and a second inner cover body; the first outer cover body is hollow inside and covers the main shaft, and the first outer cover body has uniformly arranged first cavities at the edge position, and each first cavity has a first protruding part extending towards the first inner cover body; the first inner cover body extends from the inner wall towards the center direction and has a first fixed part, and the adjacent first fixed parts have a first gap, and the first protruding part is arranged in the first gap, and each first fixed part has a first side plate, and the two first side plates of the adjacent two first fixed parts are enclosed into a frame shape matched with the frame cavity of the movement; the first inner cover body has a first baffle at the edge position, and the first baffle is integrally and closely attached with the first protruding part and the outer wall of the first outer cover body; the second outer cover body is hollow inside and covers the main shaft, and the second outer cover body has uniformly arranged second cavities at the edge position, and each second cavity has a second protruding part extending towards the second inner cover body; the second inner cover body extends from the inner wall towards the center direction and has a second fixed part, and the adjacent second fixed parts have a second gap, and the second protruding part is arranged in the second gap, and each second fixed part has a second side plate, and the two second side plates of the adjacent two second fixed parts are enclosed into a frame shape matched with the frame cavity of the movement; and the second inner cover body has a second baffle at the edge position, and the second baffle is integrally and closely attached with the second protruding part and the outer wall of the second outer cover body.

[0007] The first protruding part is a long strip-shaped column structure extending towards the first inner cover body along the top inner wall of the first outer cover body; and the second protruding part is a long strip-shaped column structure extending towards the second inner cover body along the top inner wall of the second outer cover body.

[0008] The two first side plates between the adjacent two first fixed parts have an arc-shaped connecting plate to form a frame shape; and the two second side plates between the adjacent two second fixed parts have an arc-shaped connecting plate to form a frame shape.

[0009] The cam has a hollow convex part towards the motor direction, the convex part is matched with the rotating driving mechanism, and the gear teeth are arranged at the side position of the convex part.

[0010] The linkage wheel is hollow inside, the linkage shaft is also hollow at the end position matched with the linkage wheel, and the fixing nails pass through the linkage wheel and are matched with the end position of the linkage shaft.

[0011] The linkage wheel and the fixing nails have a gasket therebetween.

[0012] The rolling ball has five balls arranged uniformly, and the ball cavity is a ring shape having a circular groove and an arc-shaped groove, and the circular groove is between the two arc-shaped grooves.

[0013] The trip wheel is a whole disc, with a straight edge mounting hole in the middle, and the linkage shaft also has a straight edge in the corresponding position, and the trip wheel is embedded in the end position of the linkage shaft.

[0014] The linkage shaft has a ring-shaped stopper at the position matched with the elastic elastic bowl, which extends outward along the direction perpendicular to the shaft center.

[0015] The beneficial effects of the present application are: by designing the diameter of the end cover close to the diameter of the movement, the transverse volume of the motor can be shortened, so that the motor is miniaturized, and the occupied volume inside the expander is reduced; by designing the rolling ball, trip wheel, pressing plate, elastic elastic bowl and other components, when the internal torsion is too large, the linkage wheel and the trip wheel will be kept in a disengaged state by sliding through the rolling ball, so as to disconnect the driving of the trip wheel to the linkage shaft. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic diagram of the expander;

[0017] Figure 2 is a sectional view of the inside of the expander;

[0018] Figure 3 is a schematic diagram of the entire motor;

[0019] Figure 4 is an exploded schematic diagram of the motor of Figure 3

[0020] Figure 5 is another angle exploded schematic diagram of the motor of Figure 3

[0021] Figure 6 is a schematic diagram of the first end cover mechanism and the second end cover mechanism of the motor of Figure 3

[0022] Figure 7 is another angle schematic diagram of the first end cover mechanism and the second end cover mechanism of the motor of Figure 3

[0023] Figure 8 is an exploded schematic diagram of the expander of Figure 1

[0024] Figure 9 is a schematic diagram of the cam cooperating with the rotating drive mechanism;

[0025] Figure 10 is a schematic diagram of the cam and the rotating drive mechanism in an exploded state of Figure 9

[0026] ​​​​​​Figure 11 is an exploded view of the rotation driving mechanism;

[0027] Figure 12 is an exploded view of the rotation driving mechanism from another angle;

[0028] Figure 13 is an exploded view of the expansion head of the pipe expander;

[0029] in the figure

[0030] 1. housing;

[0031] 2. rechargeable battery;

[0032] 3. motor, 31. main shaft, 32. core, 321. frame cavity, 33. first end cover mechanism, 331. first outer cover body, 3311. first cavity, 3312. first protruding part, 332. first inner cover body, 3321. first fixed part, 33211. first side plate, 3322. first gap, 3323. first baffle, 34. second end cover mechanism, 341. second outer cover body, 3411. second cavity, 3412. second protruding part, 342. second inner cover body, 3421. second fixed part, 34211. second side plate, 3422. second gap, 3423. second baffle; 351. first hollow hole, 352. second hollow hole, 36. connecting plate, 37. column;

[0033] 4. cam, 41. convex part, 411. gear tooth;

[0034] 5. expansion head;

[0035] 6. rotation driving mechanism, 61. linkage wheel, 611. tooth cavity, 612. ball cavity, 6121. circular groove, 6122. arc-shaped groove, 62. rolling ball, 63. release wheel, 631. straight edge, 632. ball hole, 64. pressing piece, 65. elastic bowl, 66. linkage shaft, 661. slot, 67. base, 671. rotation hole, 68. linkage tooth;

[0036] 71. fixing nail, 72. gasket;

[0037] 8. rotation cylinder. DETAILED DESCRIPTION

[0038] Please refer to Figures 1 to 13 , the pipe expander in the figure, which is designed with a housing 1, a rechargeable battery 2, a motor 3, a cam 4, an expansion head 5, a rotation driving mechanism 6, etc. Among them, the main innovation and improvement are made on the motor 3 and the rotation driving mechanism 6, so the following will focus on the description of these two parts.

[0039] The motor 3 in the figure is optimized from the original split motor 3 to a one-piece motor 3. The two end cover parts of the one-piece motor 3 are optimized based on the existing conventional one-piece motor 3. The horizontal diameter of the conventional end cover is larger than the horizontal diameter of the core 32, which facilitates the installation of the entire motor 3. In this case, the end cover is reduced in diameter, so that the diameter of the end cover is close to the diameter of the core 32, thereby reducing the occupied volume in the housing 1.

[0040] The one-piece motor 3 in the figure is designed with a core 32, a main shaft 31, a first end cover mechanism 33, and a second end cover mechanism 34. The first end cover mechanism 33 and the second end cover mechanism 34 are arranged on the front and rear sides of the core 32, respectively. The core 32 and the main shaft 31 can be made of existing components or slightly optimized existing components. The first end cover mechanism 33 and the second end cover mechanism 34 will be described in detail.

[0041] The core 32 in the figure is a one-piece structure with a hollow interior to accommodate the main shaft 31. It has a plurality of longitudinally extending cavity structure frame cavities 321 from the center to the edge. There are six frame cavities 321, each of which is approximately isosceles trapezoidal in structure. The main shaft 31 in the figure is of a conventional structure and is assembled with the core 32 in the existing manner, such as adding bearings and other components.

[0042] The first end cover mechanism 33 in the figure is designed with a first outer cover 331 and a first inner cover 332. The two parts are fixed together by mutual extrusion interference assembly. The first outer cover 331 is hollow inside to accommodate the main shaft 31. There are first hollow holes 351 and first cavities 3311 arranged uniformly outward from the hollow position. There are six first hollow holes 351 and three first cavities 3311. The first hollow holes 351 are designed to reduce the overall weight of the first outer cover 331, and the second cavities 3411 also have the same function. The first hollow holes 351 are approximately isosceles trapezoidal in structure, and the first cavities 3311 are similar to notches. The first outer cover 331 has a first protruding part 3312 extending longitudinally from the top inner wall of the first outer cover 331 to the first inner cover 332, forming a long strip column structure. There are six first protruding parts 3312 arranged uniformly. The two symmetrical positions near the first protruding part 3312 can be designed as arc-shaped to form second hollow holes 352, which have the same function as the first hollow holes 351. The first inner cover 332 has a plurality of first fixing parts 3321 arranged uniformly from the inner wall to the center in the horizontal position. There are six first fixing parts 3321 in the figure, which are arranged uniformly.Figure 2 As can be seen from the first inner cover 332, there is a first gap 3322 between two adjacent first fixing parts 3321 on the first inner cover 332, which facilitates the insertion of the first extension part 3312 of the first outer cover 331. From Figure 3 As can be seen from the first inner cover 332, each first fixing part 3321 has a bent first side plate 33211 structure on both the left and right sides. The two first side plates 33211 of two adjacent first fixing parts 3321 are connected together by an arc-shaped connecting plate 36, so that two adjacent first side plates 33211 belonging to different first fixing parts 3321 form a frame-shaped structure that protrudes towards the movement 32 through the connecting plate 36, which can be called a pillar 37 structure. In this way, the pillar 37 can be embedded into the frame cavity 321 of the movement 32 and maintain a tight fit. In the direction opposite to the upright 37, the first inner cover 332 is also designed with outwardly protruding first baffles 3323 at its edge. There are six of these first baffles 3323 evenly arranged. These first baffles 3323 can be embedded into the gap between the first extension 3312 and the outer wall of the first outer cover 331, maintaining an interference fit. This allows the first inner cover 332 to be tightly assembled with the first outer cover 331 through the first baffles 3323 and the first extension 3312. Simultaneously, the first inner cover 332 is tightly assembled with the movement 32 through the upright 37, thus ensuring that the first end cover mechanism 33 is securely fixed to the movement 32. In practical applications, the local details of the first end cover mechanism 33 can be further optimized.

[0043] The second end cover mechanism 34 in the figure is designed with a second outer cover body 341 and a second inner cover body 342 structure respectively, and the overall structure is also relatively similar. The second outer cover body 341 in the figure is hollow inside to facilitate the covering of the main shaft 31, and is designed with a first hollow hole 351, a second cavity 3411, and a second hollow hole 352 arranged uniformly from the inside to the outside in the transverse direction. The number, structure, and function of the first hollow hole 351, the second cavity 3411, and the second hollow hole 352 are consistent with the foregoing. The second outer cover body 341 extends along the top inner wall to form a protruding second protruding part 3412 in the direction of the second inner cover body 342 at the position of each second cavity 3411, which is a long strip-shaped column structure and is embedded in the second gap 3422 of the second inner cover body 342. As shown in the figure, the second inner cover body 342 extends in the transverse direction from the inner wall to the center direction and is designed with a second fixed part 3421 arranged uniformly, and similarly, the second fixed part 3421 has a second gap 3422 between adjacent second fixed parts 3421. The second fixed part 3421 is designed with a second side plate 34211 similar to the structure of the first side plate 33211, and the second side plates 34211 of two different second fixed parts 3421 have an arc-shaped connecting plate 36 structure, so that the two second side plates 34211 and the connecting plate 36 together enclose a structure that is also a column 37, which can be assembled with the frame cavity 321 of the movement 32 at another position of the movement 32. Similarly, the second inner cover body 342 is also designed with a plurality of second baffles 3423 arranged uniformly at the edge position, which can be embedded in the gap between the second protruding part 3412 and the outer wall of the second outer cover body 341, so that the second inner cover body 342 and the second outer cover body 341 are tightly attached as a whole. In actual application, the local details of the second end cover mechanism 34 can be further optimized. In actual application, the specific structure of the two end covers can be adjusted as needed.

[0044] The shell 1 and the rechargeable battery 2 in the figure can use existing accessories or slightly adjust existing accessories to form good cooperation with the optimized parts.

[0045] The cam 4 in the figure is designed with a convex part 41 on the structure of the original cam 4, specifically, the convex part 41 is hollow and extends downward in the direction of the motor 3 to form a convex part 41, and a gear tooth 411 structure is designed at the side position, i.e., the position cooperating with the rotating drive mechanism 6. The gear on the rotating drive mechanism 6 is designed with a gear cavity 611 at the corresponding position, so that when the cam 4 is driven to rotate by the motor 3, the gear tooth 411 of the cam 4 drives the linkage gear 61 to rotate at a frequency of one revolution per drive. The convex part 41 can drive the extension head 5 to rotate 15 degrees per revolution.

[0046] The expansion head 5 in the figure is a conventional expansion head 5 which is assembled with the main shaft 31 inside the housing 1, and the main shaft 31 is sleeved with the cam 4, so that when the main shaft performs the telescopic action, the expansion head 5 starts to perform the pipe expanding action.

[0047] The rotating drive mechanism 6 in the figure is designed with a linkage wheel 61, five rolling balls 62, a tripping wheel 63, a pressing plate 64, two elastic elastic bowls 65, a linkage shaft 66, two bases 67, and a linkage tooth 68. The linkage wheel 61 is used to mesh with the convex part 41, so that when the convex part 41 of the cam 4 rotates, the linkage wheel 61 can be driven to rotate. The linkage wheel 61 is designed with a tooth cavity 611 structure at the position matched with the gear teeth 411 of the convex part 41. The inside of the linkage wheel 61 is hollow, so that a fixing nail 71 can penetrate through. The linkage shaft 66 is also hollow at the corresponding position, so as to fix the linkage wheel 61 at the end position of the linkage shaft 66. The fixing nail 71 can be sleeved with an internally hollow gasket 72 structure, so that the linkage wheel 61 can move relative to the fixing nail 71. The rolling balls 62 are conventional ball structures. When the linkage wheel 61 rotates, the rolling balls 62 move in the annular ball cavity 612 on the outer side surface of the linkage wheel 61. The ball cavity 612 is on the outer side surface of the linkage wheel 61 facing the tripping wheel 63. The ball cavity 612 has a circular groove 6121 and an arc-shaped groove 6122, respectively. The circular groove 6121 is between the two arc-shaped grooves 6122. Through such a design, the circular groove 6121 plays a role in positioning rotation, and the arc-shaped groove 6122 plays a role in facilitating the rotation of the rolling ball 62. The tripping wheel 63 is a disc structure, which is internally hollow to form a mounting hole for being sleeved on the linkage shaft 66. The internally hollow position of the tripping wheel 63 has an upper and lower straight edge 631 structure, which forms a key transmission embedded fitting relationship with the upper and lower straight edges 631 of the linkage shaft 66 at the corresponding end position. The tripping wheel 63 is also punched at the position matched with the rolling ball 62 to form a ball hole 632 structure. In this way, the rolling ball 62 is arranged between the linkage wheel 61 and the tripping wheel 63 through the ball cavity 612 and the ball hole 632. When the motor 3 transmits a certain torque, the linkage wheel 61 can maintain synchronous transmission relationship with the linkage shaft 66. If the torque is too large, the linkage wheel 61 will be tripped with the tripping wheel 63 through the rolling ball 62. The linkage wheel 61 can only drive the rolling ball 62 to roll, and cannot drive the tripping wheel 63 to rotate any more. The pressing plate 64 is a conventional disc structure, which is internally hollow to be sleeved on the linkage shaft 66. It can perform a certain extrusion on the tripping wheel 63 under the action of the elastic elastic bowl 65, so that the tripping wheel 63, the steel ball, and the linkage wheel 61 maintain a close fitting relationship. The elastic elastic bowl 65 is a conventional elastic component, which uses elastic force to extrude the tripping wheel 63 in the direction towards the linkage wheel 61. The elastic elastic bowl 65 is also internally hollow to be sleeved on the linkage shaft 66. The linkage shaft 66 is designed with a ring-shaped stop 661 at the corresponding position, which protrudes and extends in a direction perpendicular to the shaft center. The linkage shaft 66 is a conventional transmission structure, and its specific structure is shown in the figure.The base 67 is also a conventional structure, which has two symmetrically arranged at both ends of the linkage shaft 66, each base 67 has a rotating hole 671 to facilitate the linkage shaft 66 through and with the base 67 each other assembly. Linkage tooth 68 is a conventional component, which is installed in the other end of the linkage shaft 66 position, so that the engagement with the rotating cylinder 8 in the pipe machine, and the rotating cylinder 8 is kept with the expansion head 5 as shown in the way of assembly, thereby through the rotating cylinder 8 drive expansion head 5 linkage. In practical application, the number of the above components such as the number of steel ball, the shape and structure of each component can be adjusted according to the needs.

[0048] The above-described embodiments are merely intended to explain the present technical solution, and are not used to limit the present technical solution. In the description of the present technical solution, it should be noted that the terms such as "upper", "inner" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present technical solution and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present technical solution.

[0049] Meanwhile, in the description of the present technical solution, it should be noted that unless otherwise explicitly specified and limited, the terms "fixed", "cooperated" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present technical solution can be understood according to the specific circumstances.

[0050] Although the embodiments of the present technical solution have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the present technical solution, and the scope of the present technical solution is defined by the appended claims and their equivalents.

Claims

1. A tube expander, characterized in that: The components include a motor (3), a cam (4), an extension head (5), and a rotary drive mechanism (6). The motor (3) is an integrated motor (3) with a core (32), an end cover, and a main shaft (31). The diameter of the end cover is close to the diameter of the core (32). The cam (4) has a tooth (411) at the position where it engages with the rotary drive mechanism (6). The rotary drive mechanism (6) has a linkage wheel (61), a ball (62), a trip wheel (63), a pressure plate (64), an elastic cup (65), a linkage shaft (66), a base (67), and a linkage tooth (68). The linkage wheel (61) has a tooth cavity (611) that engages with the tooth (411). The outer side of the linkage wheel (61) facing the trip wheel (63) has a ball. The cavity (612) and the trip wheel (63) have ball holes (632) at corresponding positions. The ball (62) is disposed in the ball cavity (612) and the ball hole (632). The ball (62) is simultaneously located between the linkage wheel (61) and the trip wheel (63). One side of the pressure plate (64) is attached to the side of the trip wheel (63), and the other side of the pressure plate (64) is engaged with the elastic cup (65). The linkage wheel (61), the trip wheel (63), the pressure plate (64), and the elastic cup (65) are all sleeved on the linkage shaft (66). The base (67) has a rotating hole (671). The two bases (67) are engaged with the linkage shaft (66) through the rotating hole (671). The linkage gear (68) is arranged on the linkage shaft (66) and The rotating cylinder (8) of the tube expander engages with the expanding head (5); the end cap is a first end cap mechanism (33) and a second end cap mechanism (34); the first end cap mechanism (33) is designed with a first outer cover body (331) and a first inner cover body (332); the second end cap mechanism (34) is designed with a second outer cover body (341) and a second inner cover body (342); the first outer cover body (331) is hollow inside and fits the main shaft (31), the first outer cover body (331) has a first cavity (3311) evenly arranged at the edge position, and each first cavity (3311) has a first protruding part (3312) extending towards the first inner cover body (332); the first inner The cover (332) has a first fixing part (3321) extending from the inner wall toward the center. There is a first gap (3322) between adjacent first fixing parts (3321). The first insertion part (3312) is disposed in the first gap (3322). Each first fixing part (3321) has a first side plate (33211). The two first side plates (33211) of two adjacent first fixing parts (3321) form a frame shape that fits with the frame cavity (321) of the mechanism (32). The first inner cover (332) has a first baffle (3323) at the edge position. The first baffle (3323) is in close contact with the outer wall of the first insertion part (3312) and the first outer cover (331).

2. The tube expander according to claim 1, characterized in that: The second outer cover (341) is hollow inside and fits the main shaft (31). The second outer cover (341) has evenly arranged second cavities (3411) at its edge. Each second cavity (3411) has a second protruding part (3412) extending towards the second inner cover (342). The second inner cover (342) has a second fixing part (3421) extending from its inner wall towards its center. There is a second gap (3422) between adjacent second fixing parts (3421). The second protruding part... (3412) is disposed in the second gap (3422). Each second fixing part (3421) has a second side plate (34211). The two second side plates (34211) of two adjacent second fixing parts (3421) form a frame shape to cooperate with the frame cavity (321) of the mechanism (32). The second inner cover (342) has a second baffle (3423) at the edge position. The second baffle (3423) is in close contact with the second extension part (3412) and the outer wall of the second outer cover (341).

3. The tube expander according to claim 2, characterized in that: The first extension (3312) is an elongated columnar structure that extends along the top inner wall of the first outer cover (331) toward the first inner cover (332); the second extension (3412) is an elongated columnar structure that extends along the top inner wall of the second outer cover (341) toward the second inner cover (342).

4. The tube expander according to claim 3, characterized in that: The two first side plates (33211) of the two adjacent first fixing parts (3321) have an arc-shaped connecting plate (36) to form a frame shape; the two second side plates (34211) of the two adjacent second fixing parts (3421) have an arc-shaped connecting plate (36) to form a frame shape.

5. The tube expander according to claim 4, characterized in that: The cam (4) has a hollow protrusion (41) facing the motor (3), which engages with the rotation drive mechanism (6), and gear teeth (411) are arranged on the side of the protrusion (41).

6. The tube expander according to claim 5, characterized in that: The linkage wheel (61) is hollow inside, and the linkage shaft (66) is also hollow at the end position that cooperates with the linkage wheel (61). The fixing nail (71) passes through the linkage wheel (61) and cooperates with the end position of the linkage shaft (66).

7. The tube expander according to claim 6, characterized in that: A washer (72) is provided between the linkage wheel (61) and the fixing pin (71).

8. The tube expander according to claim 7, characterized in that: The rolling ball (62) has five balls evenly arranged. The ball cavity (612) is annular in shape and has a circular groove (6121) and an arc groove (6122). The circular groove (6121) is located between the two arc grooves (6122).

9. The tube expander according to claim 8, characterized in that: The release wheel (63) is generally disc-shaped, with a mounting hole with a straight edge (631) in the middle of its interior. The linkage shaft (66) also has a straight edge (631) in the corresponding position. The release wheel (63) is embedded into the end position of the linkage shaft (66).

10. The tube expander according to claim 9, characterized in that: The linkage shaft (66) has an annular stop (661) at the position where it mates with the elastic bowl (65), and the annular stop (661) extends protruding in a direction perpendicular to the axis.

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