Pipe expander

Abstract

The utility model discloses a pipe expanding machine, which belongs to the technical field of electric tools, and comprises a pipe expanding mould, an ejector pin, a driving piece and a shifting component, the pipe expanding mould comprises a clamping jaw, and the shifting component comprises a rotating piece which is rotatably arranged, a force storage piece which is connected with the rotating piece and a shifting piece which is used for driving the clamping jaw to rotate. The shifting piece is arranged between the rotating piece and the clamping jaw and is used for transmitting the shifting action, and the rotating piece and the shifting piece can be in transmission connection or transmission separation; the ejector pin moving forwards drives the rotating piece to rotate forwards, the rotating piece rotating forwards enables the force storage piece to generate elastic deformation so as to enable the force storage piece to complete force storage, and the rotating piece rotating forwards is in transmission separation with the shifting piece; the force storage part recovers elastic deformation in the backward movement process of the ejector pin and drives the rotating part to rotate reversely, and the rotating part rotating reversely is in transmission joint with the shifting part to shift the clamping jaw. The load of the motor cannot be instantly increased due to rotation blocking of the clamping jaw, namely, the driving load of the motor is stable, and the working performance stability of the motor can be guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, and in particular to a pipe expander. Background Technology

[0002] Pipe expanders are primarily used for pipe connections. In operation, the expander first expands the end of a pipe fitting, then inserts another pipe fitting into the expanded end, and finally uses a crimping tool to tighten the two fittings to complete the connection. In practice, to improve the expansion effect, the pipe end typically needs to be expanded multiple times. Usually, after each expansion action, the clamping jaws retract and rotate a certain angle before expanding again, until the jaws have rotated approximately one full revolution. To improve efficiency, some pipe expanders are designed with a rotating mechanism that intermittently drives the jaws to rotate a certain angle after the expansion action. In existing pipe expanders, the jaw rotation is usually driven by a motor through an intermittent transmission structure. When the jaws become blocked and cannot be rotated, the motor's drive load increases instantaneously, which is detrimental to maintaining motor performance stability. Utility Model Content

[0003] To address the shortcomings and deficiencies in the existing technology, this utility model provides a pipe expander in which the force driving the chuck to rotate does not come directly from the motor. When the chuck stalls, the motor load does not increase instantaneously due to the stall, meaning the motor's driving load is relatively stable, which helps ensure the stability of the motor's working performance.

[0004] To achieve the above technical objectives, the pipe expander provided by this utility model includes:

[0005] The tube expansion mold includes multiple circumferentially distributed clamps that can be retracted or opened;

[0006] The ejector pin can move back and forth. When the ejector pin moves forward, it causes the clasp to open under force, and when the ejector pin moves backward, it releases the clasp so that the clasp can close.

[0007] The driving component is used to drive the movement of the ejector pin;

[0008] A rotary assembly is used to drive the fully opened chuck to rotate.

[0009] The toggle assembly includes a rotatable rotating component, a power storage component connected to the rotating component, and a toggle component for driving the chuck to rotate. The toggle component is located between the rotating component and the chuck and is used to transmit the toggle action. The rotating component and the toggle component can be engaged or disengaged through transmission.

[0010] The forward-moving ejector pin drives the rotating component to rotate in the forward direction. The forward-rotating rotating component causes the energy storage component to undergo elastic deformation so that the energy storage component can complete the energy storage. Furthermore, the forward-rotating rotating component is disengaged from the turning component.

[0011] During the backward movement of the ejector pin, the accumulator recovers its elastic deformation and drives the rotating component to rotate in the opposite direction. The rotating component in the opposite direction engages with the shifting component to shift the pawl.

[0012] Preferably, the rotating component is sleeved on the outer periphery of the ejector pin. One of the outer peripheral wall of the ejector pin and the inner peripheral wall of the rotating component is provided with a linkage groove, and the other is provided with a linkage block. At least a part of the groove wall of the linkage groove is twisted or tilted relative to the central axis of the ejector pin. The linkage block is inserted into the linkage groove. The ejector pin moving forward drives the rotating component to rotate in the forward direction through the cooperation of the linkage groove and the linkage block.

[0013] Preferably, the pipe expander includes a fixedly installed support sleeve, a rotatable rotating component located inside or outside the support sleeve, one end of a power storage component connected to the rotating component, and the other end of the power storage component connected to the support sleeve.

[0014] Preferably, the rotating component is provided with a positioning block, and one end of the energy storage component is provided with a first connecting foot that hooks with the positioning block; and / or, the support sleeve is provided with a fixing block, and the other end of the energy storage component is provided with a second connecting foot that hooks with the fixing block.

[0015] Preferably, one of the rotating component and the support sleeve is provided with a limiting block, and the other is provided with a limiting groove extending in the circumferential direction. The limiting block is inserted into the limiting groove to limit the rotation angle of the rotating component.

[0016] Preferably, the energy storage element is located on the outer periphery of the rotating element, and the energy storage element is limited in the front-rear direction.

[0017] Preferably, the rotating component is sleeved on the outer periphery of the ejector pin, the inner peripheral wall of the rotating component is provided with protruding teeth, and the rotating component is provided with swingable ratchet teeth. The rotating component rotates in the forward direction so that the ratchet teeth slip relative to the protruding teeth so that the rotating component and the rotating component are in a state of transmission separation. The rotating component rotates in the reverse direction so that the ratchet teeth abut against the protruding teeth so that the rotating component and the rotating component are in a state of transmission engagement.

[0018] Preferably, the rotating component is provided with an elastic element with one end positioned and the other end in contact with the ratchet tooth, the elastic element biasing the ratchet tooth toward the protruding tooth.

[0019] Preferably, the ratchet is located on the front side of the rotating component, and the protruding teeth are located on the inner peripheral wall of the rear end of the rotating component.

[0020] Preferably, the pipe expander further includes a fixedly installed connecting sleeve located outside the rotating component. The pipe expander mold also includes an annular seat, with the rear ends of each claw connected to the annular seat. The pipe expander mold is connected to the connecting sleeve through the annular seat so that the claws engage with the rotating component.

[0021] By adopting the above technical solution, this utility model has the following advantages:

[0022] 1. The pipe expander provided by this utility model, when the ejector pin moves forward, causes the chuck to open under force. At the same time, when the ejector pin moves forward, it drives the rotating part of the rotary assembly to rotate in the forward direction. The rotating part in the forward direction causes the energy storage part to undergo elastic deformation. The energy storage part that has undergone elastic deformation completes the energy storage. The rotating part in the forward direction is in a transmission separation state with the rotary assembly. During the process of the chuck opening to expand the pipe fitting, the rotary assembly will not cause the chuck to rotate through the rotary assembly. This allows the chuck to open smoothly under the pushing action of the ejector pin to expand the pipe fitting, ensuring the expansion effect of the opened chuck on the end of the pipe fitting. When the ejector pin moves backward, it releases the jaws, ending the current expansion action. The jaws, released by the ejector pin, gradually retract during the backward movement. Simultaneously, as the ejector pin moves backward, the accumulator gradually recovers its elastic deformation. This recovered elastic deformation applies force to the rotating component, causing it to rotate in the opposite direction. The rotating component engages with the deflector, which in turn drives the deflector to rotate. This deflector then rotates the jaws, causing the jaws released by the ejector pin to rotate by a certain angle during the backward movement. This allows the jaws to rotate intermittently during pipe expansion, eliminating the need for manual rotation of the pipe fitting or the pipe expander. Because the jaw rotation occurs during the ejector pin's backward resetting process, the pipe expander does not require additional waiting time to complete the jaw rotation, thus improving the machine's efficiency. In addition, since the rotation of the chuck is driven by the shifting component connected to the rotating component, and since the reverse rotation of the shifting component is driven by the energy storage component that restores elastic deformation, the force that drives the chuck to rotate does not come directly from the motor. When the chuck stalls, the load on the motor will not increase instantaneously due to the stall of the chuck. That is, the driving load of the motor is relatively stable, which is conducive to ensuring the stability of the motor's working performance.

[0023] 2. A linkage groove and a linkage block are provided between the outer peripheral wall of the ejector pin and the inner peripheral wall of the rotating component. At least part of the groove wall is twisted or tilted relative to the central axis of the ejector pin. The forward-moving ejector pin, through the cooperation of the linkage block and the linkage groove, drives the rotating component to rotate forward. This forward rotation causes the energy storage component to undergo elastic deformation, completing energy storage. When the ejector pin moves backward, the backward movement causes the linkage block to release the linkage groove. The restored energy storage component can then smoothly drive the rotating component to rotate in the opposite direction. This allows the rotating component to drive the pawl to rotate during the backward movement of the ejector pin via the shifting component. A well-designed cooperation structure between the ejector pin and the rotating component ensures that the rotating component can smoothly rotate forward during the forward movement of the ejector pin, allowing the energy storage component to complete its energy storage, and also allows the rotating component to smoothly rotate in the opposite direction under the action of the energy storage component during the backward movement of the ejector pin.

[0024] 3. The rotating component is rotatably located inside or outside the support sleeve. The support sleeve provides mounting support for the rotating component, allowing it to be axially positioned and installed. One end of the energy storage component is connected to the rotating component, and the other end is connected to the support sleeve for positioning. The appropriate fit structure between the energy storage component and the rotating component ensures that the energy storage component can undergo sufficient elastic deformation when the rotating component rotates forward, and that the energy storage component, after recovering its deformation, can smoothly drive the rotating component to rotate in the opposite direction.

[0025] 4. A positioning block is provided on the rotating component, and the first connecting piece at one end of the accumulator is hooked to the positioning block. A fixing block is provided on the support sleeve, and the second connecting foot at the other end of the accumulator is hooked to the fixing block. The mating structures between the accumulator and the rotating component and the support sleeve are reasonably designed to ensure the stability of the mating structure between the accumulator and the rotating component, as well as the stability of the mating structure between the accumulator and the support sleeve.

[0026] 5. A limiting block and a limiting groove are set between the rotating part and the support sleeve. The limiting block is inserted into the limiting groove that extends circumferentially. The cooperation between the limiting block and the limiting groove limits the rotation angle of the rotating part when it rotates in the forward or reverse direction, ensuring the rotational stability of the rotating part and the structural stability of the energy storage component. This avoids the situation where the energy storage component structure is unstable or the rotating part is unstable due to excessive rotation amplitude of the rotating part, thereby ensuring the stability and effectiveness of the turning assembly driving the pawl to rotate.

[0027] 6. The energy storage component is located on the outer periphery of the rotating component, placing it as close as possible to minimize the installation space required for both components. This also maximizes the force exerted by the energy storage component during recovery deformation on the rotating component, allowing it to smoothly drive the rotating component to rotate in the opposite direction. The energy storage component is constrained in the front-to-back direction to ensure its structural stability, thereby guaranteeing the synchronicity of the linkage between the energy storage component and the rotating component. This ensures that the rotating component can cause sufficient elastic deformation in the energy storage component during forward rotation, and that the energy storage component during recovery deformation can smoothly drive the rotating component to rotate in the opposite direction.

[0028] 7. When the rotating component rotates forward, the ratchet on the rotating component slips against the protruding teeth on the inner circumferential wall of the shifting component, and the rotating component and the shifting component are in a state of disengagement. The forward-rotating component cannot drive the shifting component to rotate. When the rotating component rotates in the reverse direction, the ratchet on the rotating component abuts against the protruding teeth on the inner circumferential wall of the shifting component, and the rotating component and the shifting component are in a state of engagement. The reverse-rotating component can drive the shifting component to rotate through the abutment of the ratchet and the protruding teeth, thus allowing the shifting assembly to smoothly shift the chuck. A properly designed transmission engagement structure between the rotating component and the shifting component ensures that the rotating component can drive the chuck to rotate in a timely and effective manner through the shifting component.

[0029] 8. One end of the elastic element is positioned, and the other end contacts the ratchet. The elastic element pushes the ratchet against the convex tooth. When the rotating part rotates forward, causing the ratchet to slip relative to the convex tooth, the ratchet, which is pushed against the convex tooth and swings towards the center of the rotating part, causes the elastic element to undergo elastic deformation under force. When the ratchet is released by the convex tooth, the elastic element, having recovered its deformation, drives the ratchet to swing away from the center of the rotating part, so that the ratchet can abut against the convex tooth. When the rotating part rotates in the opposite direction, the elastic element pushes the ratchet against the convex tooth. Under the force applied by the elastic element, the ratchet is in a stable abutment state with the convex tooth, thus putting the rotating part and the shifting part in a stable transmission engagement state, so that the rotating part can drive the pawl to rotate smoothly through the shifting part.

[0030] 9. The ratchet is located on the front side of the rotating part, and the convex tooth is located on the inner peripheral wall of the rear end of the rotating part. The reasonable arrangement of the ratchet and convex tooth positions facilitates the reasonable layout of the overall structure of the pipe expander, so as to appropriately reduce the external size of the pipe expander. It can also appropriately reduce the lever arm length of the rotating part driving the chuck to rotate through the rotating part, so as to ensure the magnitude of the force of the rotating part driving the chuck to rotate through the rotating part. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the tube expander in Example 1;

[0032] Figure 2 This is a diagram of the internal structure of the tube expander in Example 1;

[0033] Figure 3 This is a partial structural diagram of the internal structure of the tube expander in Example 1;

[0034] Figure 4 This is a structural diagram of the tube expanding mold in the tube expanding machine of Example 1;

[0035] Figure 5 This is an axial sectional view of the pipe expanding mold in the pipe expanding machine of Embodiment 1;

[0036] Figure 6 This is an exploded view of the transmission structure, ejector pin, rotary assembly, support sleeve, and connecting sleeve in the tube expander of Embodiment 1.

[0037] Figure 7 This is a schematic diagram of the cam structure in the tube expander of Example 1;

[0038] Figure 8 This is a structural diagram showing the assembly of the rotating parts, the energy storage parts, and the support sleeve in the tube expander of Embodiment 1;

[0039] Figure 9 This is a structural diagram of the rotating component in the tube expander of Example 1;

[0040] Figure 10 This is a structural diagram of the rotating component in the tube expander of Embodiment 1 from another perspective;

[0041] Figure 11 This is an axial sectional view of the rotating component in the tube expander of Embodiment 1;

[0042] Figure 12 This is a structural diagram of the energy storage component in the rotating parts of the tube expander in Embodiment 1;

[0043] Figure 13 This is a structural diagram of the support sleeve in the tube expander of Example 1;

[0044] Figure 14 This is a structural diagram of the ratchet, elastic element, and rotating element in the tube expander of Example 1;

[0045] Figure 15 This is a structural diagram of the ratchet in the tube expander of Example 1;

[0046] Figure 16 This is a structural diagram of the rotating component in the tube expander of Example 1;

[0047] Figure 17 This is an axial sectional view of the tube expander in Embodiment 1 when the ejector pin is in the initial position and all the jaws are in the retracted state;

[0048] Figure 18 This is an axial sectional view of the tube expander in Embodiment 1 when the ejector pin is in the ejected position and all the jaws are in the open state;

[0049] Figure 19 This is a schematic diagram of the tube expander in Example 2;

[0050] Figure 20 This is a diagram showing the internal structure of the tube expander in Example 2;

[0051] Figure 21 This is a partial structural diagram of the internal structure of the tube expander in Example 2.

[0052] In the diagram, 100 is the tube expansion mold, 110 is the chuck, 111 is the arc-shaped protrusion, 112 is the second engagement block, 120 is the annular seat, 121 is the annular groove, and 130 is the gathering spring.

[0053] 200-Ejector pin, 210-Ejector rod, 211-Ring body, 212-Back plate, 213-Lug, 220-Conical head, 230-Roller, 240-Pin, 250-Pin column

[0054] 300 - Drive component, 310 - Motor, 320 - Reduction gear mechanism

[0055] 400-Turn assembly, 410-Rotating component, 411-Center hole, 412-Positioning block, 413-Recessed area, 414-Positioning groove, 420-Power storage component, 420a-Tension spring, 421-First connecting foot, 422-Second connecting foot, 430-Turn assembly, 431-First engaging block, 441-Linkage groove, 441a-First groove wall, 441b-Second groove wall, 442-Linkage block, 451-Limiting block, 452-Limiting groove, 461-Protruding tooth, 462-Ratchet, 463-Pin, 464-Elastic component, 464a-Compression spring, 465-Protrusion, 470-Baffle, 480-Engine structure

[0056] 500 - Transmission structure, 510 - Rotating shaft, 520 - Cam, 521 - Push surface, 522 - Clearance surface, 523 - Transition surface.

[0057] 600 - Casing, 610 - Handle

[0058] 710 - Return spring, 720 - Support sleeve, 721 - Raised edge, 722 - Extension, 723 - Slide groove, 724 - Fixing block, 725 - Protrusion, 730 - Connecting sleeve.

[0059] 810 - Control board, 820 - Switch, 830 - Detection element, 840 - Trigger element, 850 - Operation element. Detailed Implementation

[0060] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the terms "upper," "lower," "left," "right," "longitudinal," "lateral," "inner," "outer," "vertical," "horizontal," "top," and "bottom," etc., which indicate orientation or positional relationship, are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0061] Example 1

[0062] Combination Figures 1 to 18 The tube expander provided in Embodiment 1 of this utility model includes:

[0063] The tube expansion mold 100 includes multiple circumferentially distributed and retractable or expandable claws 110;

[0064] The ejector pin 200 can move back and forth. When the ejector pin 200 moves forward, it causes the pawl 110 to open under force. When the ejector pin 200 moves backward, it releases the pawl 110 so that the pawl 110 can close.

[0065] The drive unit 300 is used to drive the ejector pin 200 to move.

[0066] The rotary assembly 400 is used to drive the closed pawl 110 to rotate.

[0067] The toggle assembly 400 includes a rotatable rotating member 410, a power storage member 420 connected to the rotating member 410, and a toggle member 430 for driving the pawl 110 to rotate. The toggle member 430 is located between the rotating member 410 and the pawl 110 and is used to transmit the toggle action. The rotating member 410 and the toggle member 430 can be engaged or disengaged in transmission.

[0068] The forward-moving ejector pin 200 drives the rotating component 410 to rotate in the forward direction. The forward-rotating rotating component 410 causes the energy storage component 420 to undergo elastic deformation so that the energy storage component 420 completes energy storage. Furthermore, the forward-rotating rotating component 410 is disengaged from the rotating component 430.

[0069] During the backward movement of the ejector pin 200, the energy storage component 420 recovers its elastic deformation and drives the rotating component 410 to rotate in the opposite direction. The rotating component 410 rotates in the opposite direction and engages with the shifting component 430 to shift the pawl 110.

[0070] Since the rotation of the chuck 110 occurs during the resetting process of the ejector pin 200, the tube expander does not require an additional waiting time to complete the rotation of the chuck 110, thus improving the working efficiency of the tube expander. Furthermore, the rotation of the chuck 110 is driven by the deflector 430, which is connected to the rotating component 410, and the reverse rotation of the deflector 430 is driven by the energy storage component 420, which recovers its elastic deformation. Therefore, the force driving the rotation of the chuck 110 does not directly originate from the motor 310. When the chuck 110 stalls, the load on the motor 310 does not increase instantaneously due to the stall, meaning the driving load on the motor 310 is relatively stable, which helps ensure the stability of the motor 310's working performance.

[0071] In this embodiment, the direction in which the ejector pin 200 moves toward the tube expansion mold 100 to open the claws 110 is defined as forward, and the direction in which the ejector pin 200 moves away from the tube expansion mold 100 to close the claws 110 is defined as backward.

[0072] Combination Figure 4 , Figure 5In this embodiment, the tube expansion mold 100 also includes an annular seat 120, and the rear end of each claw 110 is connected to the annular seat 120. Specifically, there are six claws 110 in total, arranged sequentially around the circumference of the annular seat 120. An annular groove 121 is provided on the inner wall of the front end of the annular seat 120. The rear end of each claw 110 extends into the front end of the annular seat 120, and the rear end of each claw 110 is provided with an outwardly protruding arc-shaped flange 111. The arc-shaped flange 111 is embedded in the annular groove 121, so that the claw 110 is connected to the annular seat 120. The cooperation between the arc-shaped flange 111 and the annular groove 121 also axially limits the claw 110. The outer wall of the arc-shaped protrusion 111 has a concave groove. The rear end of the claw 110 is provided with a gathering spring 130 that engages with the arc-shaped protrusion 111 to clamp each claw 110. The gathering spring 130 is embedded in the groove on the arc-shaped protrusion 111 and is also located in the annular groove 121 of the annular seat 120. The gathering spring 130 is annular and applies a preload to the claw 110, so that each claw 110 is in a retracted state under normal conditions. In the retracted state, each claw 110 is tightly packed together, and the front ends of each claw 110 are gathered together to form a conical head with a maximum outer diameter of D1. When the ejector pin 200 moves forward and the force on each claw 110 switches from the retracted state to the open state, a certain gap ring is generated between two adjacent claws 110 and the gathering spring 130 is deformed by the force. The overall outer diameter of the claw 110 becomes D2, where D2 > D1. When the ejector pin 200 moves backward to release each jaw 110, the recovery spring 130 drives each jaw 110 to return from the open state to the closed state. As a preferred embodiment, the pipe expander can be configured with multiple pipe expanding molds 100, each with a different maximum outer diameter of the jaws 110 in the closed state, allowing the expander to expand pipes of different diameters. It is understood that the number of jaws 110 in the pipe expanding mold 100 is not limited to six; it can also be set to three, four, five, seven, eight, or other reasonable numbers. It is also understood that multiple grooves with front-to-back spacing can be provided on the outer wall of each jaw 110.

[0073] Combination Figure 2 , Figure 3In this embodiment, the driving component 300 drives the ejector pin 200 to move forward through the transmission structure 500. Specifically, the driving component 300 includes a motor 310 and a reduction mechanism 320, and the transmission structure 500 includes a rotating shaft 510 and a cam 520. The power shaft of the motor 310 is connected to the input shaft of the reduction mechanism 320, and the rotating shaft 510 is connected to the output shaft of the reduction mechanism 320. Of course, the output shaft of the reduction mechanism 320 can also be directly used as the rotating shaft 510. The cam 520 is fixedly sleeved on the rotating shaft 510, and the rotating shaft 510 is rotatably mounted through bearings. The rotating shaft 510 and the cam 520 can rotate about the central axis C of the rotating shaft 510 as the rotation center line. Specifically, in this embodiment, the motor 310 drives the rotating shaft 510 to rotate unidirectionally in the direction shown by ω through the reduction mechanism 320, and the rotating shaft 510 drives the cam 520 to rotate synchronously in the direction shown by ω. It is understandable that the reduction mechanism 320 can adopt a multi-stage planetary gear structure or other reduction transmission structure that meets the requirements of reduction transmission.

[0074] Combination Figure 1 In this embodiment, the tube expander also includes a housing 600. To appropriately reduce the overall dimensions of the tube expander in the front-rear direction, the central axis of the motor 310 is approximately coincident with the central axis of the rotating shaft 510. Furthermore, the axial direction of the rotating shaft 510 is preferably perpendicular to the axial direction of the ejector pin 200, meaning the ejector pin 200 is perpendicular to the rotating shaft 510 and the motor 310. The motor 310 and the reduction mechanism 320 are housed within the handle 610 formed by the housing 600. The cam 520, ejector pin 200, and rotary assembly 400 are housed within the main cavity of the housing 600, giving the tube expander an overall shape approximately pistol-shaped. The tube expander in this embodiment can be powered by a battery pack or by connecting to mains power via a plugged wire. Other structures of the tube expander can refer to existing technologies, such as a switch on the housing 600 for controlling start and stop, a control board inside the housing 600, and the rotating shaft 510 being rotatably mounted within the housing 600 via bearings, etc., which will not be elaborated further here. Of course, the motor 310 and the shaft 510 can also be distributed in other ways, such as the shaft 510 being set at an angle or perpendicular to the shaft of the motor 310. The overall shape of the pipe expander can also be set into other reasonable styles according to the distribution of each component.

[0075] Combination Figure 6In a preferred embodiment, the ejector pin 200 includes a push rod 210 and a cone 220. The push rod 210 includes a rod portion 211 extending front to back, and the cone 220 is connected to the front end of the rod portion 211. The cone 220 is tapered, tapering from front to back, and the outer diameter of the rear end of the cone 220 is larger than the outer diameter of the rod portion 211. To reduce the friction between the cam 520 and the ejector pin 200 when driving the ejector pin 200 forward, a rotatable roller 230 is provided at the rear end of the ejector pin 200. The outer circumferential surface of the cam 520 abuts against the roller 230, and the rotating cam 520 applies force to the ejector pin 200 through the roller 230, causing the ejector pin 200 to move forward under force. In this embodiment, the rear end of the rod body 211 is provided with a disc-shaped rear plate 212. The rear plate 212 has two rearwardly protruding and oppositely arranged lugs 213. The roller 230 is rotatably mounted between the two lugs 213 via a pin 240. The two ends of the pin 240 are respectively inserted into the holes on the two lugs 213. Preferably, the axial direction of the pin 240 is parallel to the axial direction of the rotating shaft 510, and preferably perpendicular to the axial direction of the ejector pin 200. Since the roller 230 can rotate circumferentially relative to the pin 240, the contact friction between the cam 520 and the ejector pin 200 can be effectively reduced, allowing the cam 520 to smoothly drive the ejector pin 200 forward. In this embodiment, the cone 220 and the rod 211 are fixed together by a threaded connection. Of course, the cone 220 and the rod 211 can also be fixed together in other ways, or the cone 220 and the rod 211 can be integrally formed.

[0076] Combination Figure 7 The outer peripheral wall of the cam 520 is provided with a push surface 521, a clearance surface 522 and a transition surface 523 distributed sequentially along the circumference. Figure 7 Point E in the diagram represents the near end of the push surface 521, and point F represents the far end of the push surface 521. The push surface 521 extends from point E along an involute to point F, meaning that the push surface 521 is roughly an involute-shaped arc surface. Point C represents the central axis of the rotation axis 510. ⊙D represents a circle drawn with point C as the center and the distance between point C and point F as the radius. The radial distance between the push surface 521 and the circular outline shown in ⊙D gradually decreases from point E to point F. Figure 7 Point G in the diagram represents the boundary between the clearance surface 522 and the transition surface 523. One end of the clearance surface 522 is smoothly connected to the far end of the push surface 521, and the other end of the clearance surface 522 is smoothly connected to the transition surface 523. Both ends of the transition surface 523 are smoothly connected to the near ends of the clearance surface 522 and the push surface 521, respectively. The distance between each point on the clearance surface 522 and point C is less than the distance between point F and point C. The distance between each point on the transition surface 523 and point C gradually increases from point G to point E. When the tube expander is working, the drive component 300 drives the cam 520 along the shaft 510. Figure 7Rotating in the direction indicated by ω, when the push surface 521 of the cam 520 contacts the roller 230, the cam 520 drives the ejector pin 200 forward through the contact between the push surface 521 and the roller 230. The forward movement of the ejector pin 200 causes each pawl 110 to switch from the retracted state to the open state. When the cam 520 rotates to the point where the clearance surface 522 contacts the roller 230, the cam 520 releases the roller 230, and the ejector rod 210 can move backward to reset and release each pawl 110. Each pawl 110 can then switch from the open state to the retracted state under the action of the convergence spring 130.

[0077] To ensure that the ejector pin 200 can move backward smoothly and promptly to reset when released by the cam 520, a return spring 710 is sleeved on the outside of the ejector pin 200. Specifically, in this embodiment, the return spring 710 is sleeved on the outside of the rod body 211, with its front end positioned and its rear end lower than the rear plate 212 of the ejector rod 210. When the ejector pin 200 moves forward driven by the cam 520, the return spring 710 is compressed and undergoes elastic deformation. When the push surface 521 of the cam 520 disengages from the roller 230, the cam 520 releases the ejector pin 200. At this time, the restored return spring 710 applies force to the ejector pin 200, causing it to move backward to reset. After the ejector pin 200 has moved backward to its reset position, the push surface 521 of the cam 520 will again contact the roller 230 and drive the ejector pin 200 forward through the roller 230.

[0078] When the clearance surface 522 on the cam 520 contacts the roller 230, the ejector pin 200 is in the rearward initial position under the bias of the return spring 710. At this time, all the pawls 110 are in a fully retracted state. When the cam 520 moves to the point F on the push surface 521 and roughly contacts the roller 230, the ejector pin 200 is in the forward ejected position. At this time, all the pawls 110 are in a fully open state.

[0079] In this embodiment, the tube expander further includes a support sleeve 720 fixedly disposed within the housing 600. The support sleeve 720 is fitted over the outside of the ejector pin 200, and the central axis of the support sleeve 720 is preferably approximately coincident with the central axis of the ejector pin 200. The inner diameter of the support sleeve 720 is larger than the outer diameter of the ejector pin 200, and there is a certain radial gap between the outer peripheral wall of the ejector pin 200 and the inner peripheral wall of the support sleeve 720. Figure 13The support sleeve 720 has a raised edge 721 protruding towards the center at its front end. The return spring 710 is located inside the support sleeve 720. The front end of the return spring 710 abuts against the raised edge 721 to achieve positioning, and the rear end of the return spring 710 abuts against the front surface of the rear plate 212 to contact the ejector pin 200. The rear end of the support sleeve 720 has two opposing and rearwardly extending extensions 722. The extensions 722 have sliding grooves 723 extending in the front-rear direction. The two ends of the pin 240 extend outward from the lugs 213 and are inserted into the sliding grooves 723. When the ejector pin 200 moves back and forth relative to the support sleeve 720, the ends of the pin 240 slide back and forth in the sliding grooves 723. The engagement of the pin 240 and the sliding grooves 723 limits the ejector pin 200 circumferentially, preventing the ejector pin 200 from rotating circumferentially during the back-and-forth movement.

[0080] Combination Figure 8 , Figure 9 , Figure 10 In this embodiment, the rotating member 410 is a hollow disc shape. The rotating member 410 is sleeved on the outer periphery of the ejector pin 200. A linkage groove 441 is provided at one location on the outer periphery of the ejector pin 200 and a linkage block 442 is provided at the other location on the inner periphery of the rotating member 410. At least a portion of the groove wall of the linkage groove 441 is twisted or tilted relative to the central axis of the ejector pin 200. The linkage block 442 is inserted into the linkage groove 441. The forward-moving ejector pin 200 drives the rotating member 410 to rotate forward through the cooperation of the linkage groove 441 and the linkage block 442. Specifically, the rotating member 410 is located outside the support sleeve 720 and in front of the support sleeve 720. The rotating member 410 is sleeved on the outer periphery of the rod body 211. A central hole 411 is provided at the center of the rotating member 410. The diameter of the central hole 411 is slightly larger than the outer diameter of the rod body 211. The rotating member 410 can... Figure 8 The central axis indicated by the straight line H is the rotation center line. A pin 250 is fixed to the rod body 211 of the ejector pin 200. The pin 250 is perpendicular to the rod body 211, and its two ends extend out of the rod body 211 to form linkage blocks 442 located on the outer peripheral wall of the ejector pin 200. There are two linkage blocks 442, evenly spaced along the circumference of the rod body 211. Linkage grooves 441 are provided on the wall of the central hole 411. There are two linkage grooves 441, evenly spaced along the circumference of the central hole 411. The two linkage blocks 442 are respectively inserted into the two linkage grooves 441. Figure 11 The linkage groove 441 has a first groove wall 441a and a second groove wall 441b, wherein the first groove wall 441a is arranged parallel to the central axis of the rotating member 410 shown by line H, and the second groove wall 441b is twisted relative to the central axis of the rotating member 410 shown by line H. During the forward movement of the ejector pin 200, the linkage block 442 abuts against the second groove wall 441b of the linkage groove 441, causing the rotating member 410 to be subjected to force along... Figure 8 The rotation proceeds in the direction indicated by γ. As an optional embodiment, the second groove wall 441b may be twisted, either wholly or partially, relative to the central axis of the rotating member 410 indicated by line H; or, the second groove wall 441b may be tilted, either wholly or partially, relative to the central axis of the rotating member 410 indicated by line H. Alternatively, the positions of the linkage groove 441 and the linkage block 442 may be interchanged, with the linkage groove 441 located on the outer peripheral wall of the rod portion 211 and the linkage block 442 located on the inner peripheral wall of the rotating member 410.

[0081] Combination Figure 12 In this embodiment, one end of the energy storage component 420 is connected to the rotating component 410, and the other end is connected to the support sleeve 720. When the rotating component 410 rotates in the forward direction, the energy storage component 420 undergoes elastic deformation under stress. Specifically, the energy storage component 420 is preferably a tension spring 420a. One end of the energy storage component 420 is provided with a hook-shaped first connecting foot 421, and the other end of the energy storage component 420 is provided with a hook-shaped second connecting foot 422. The tension spring 420a, serving as the energy storage component 420, is located on the outer periphery of the rotating component 410, and the contact between the energy storage component 420 and the outer peripheral wall of the rotating component 410 provides a certain degree of support to the energy storage component 420. The rotating component 410 has a positioning block 412 protruding radially outward from its outer peripheral wall. The positioning block 412 has a hole for inserting a first connecting leg 421. Inserting the first connecting leg 421 into the hole of the positioning block 412 causes the first connecting leg 421 to hook with the positioning block 412, thereby connecting one end of the energy storage component 420 to the rotating component 410. The support sleeve 720 has a fixing block 724 protruding forward from its front end. The fixing block 724 is located circumferentially outside the rotating component 410. The fixing block 724 and the limiting block 451 are spaced apart circumferentially along the rotating component 410. The fixing block 724 has a hole for inserting a second connecting leg 422. Inserting the second connecting leg 422 into the hole of the fixing block 724 causes the second connecting leg 422 to hook with the fixing block 724, thereby connecting the other end of the energy storage component 420 to the support sleeve 720 for positioning. The rotating component 410... Figure 8 When rotating in the forward direction indicated by γ, the distance between the limiting block 451 and the fixed block 724 gradually increases, and the tension spring 420a, which acts as a force storage element 420, is stretched, resulting in elastic deformation. When the return spring 710 drives the ejector pin 200 to move backward, the force storage element 420, which has recovered its deformation, applies force to the rotating element 410, causing the rotating element 410 to rotate along... Figure 8 Rotate in the opposite direction as shown in the middle-γ direction.

[0082] In this embodiment, to limit the rotation angle of the rotating member 410 when it rotates in both directions, one of the rotating member 410 and the support sleeve 720 is provided with a limiting block 451, and the other is provided with a limiting groove 452 extending circumferentially. The limiting block 451 is inserted into the limiting groove 452 to limit the rotation angle of the rotating member 410. Specifically, the rotating member 410 is provided with a limiting block 451 that protrudes radially outward from the outer peripheral wall, and the support sleeve 720 is provided with a protrusion 725 that protrudes forward from the front end. The protrusion 725 and the fixing block 724 are distributed at a distance along the circumference of the support sleeve 720. The space between the protrusion 725 and the fixing block 724 forms the limiting groove 452. The limiting block 451 is inserted into the limiting groove 452, and the rotation angle of the rotating member 410 is limited by the cooperation between the limiting block 451 and the limiting groove 452. When the rotating member 410 rotates in the forward direction until the limiting block 451 abuts against the fixed block 724, the rotating member 410 rotates to its final position and can no longer rotate. When the rotating member 410 rotates in the reverse direction until the limiting block 451 contacts the protrusion 725, the rotating member 410 rotates to its final position and can no longer rotate. As an alternative to this embodiment, the positions of the limiting block 451 and the limiting groove 452 can be interchanged.

[0083] Combination Figure 16 , Figure 17 In this embodiment, the rotating component 430 is a sleeve-shaped part that is thinner at the front and thicker at the back. The rotating component 430 is sleeved on the outside of the ejector pin 200, and the rotating component 430 is in clearance fit with the cone head 220 of the ejector pin 200. The rotating component 430 is located between the rotating component 410 and the pawl 110 in the front-back direction. The rear end face of the rotating component 430 and the front end face of the support sleeve 720 are a certain distance apart in the front-back direction. The energy storage component 420 is located between the rear end face of the rotating component 430 and the front end face of the support sleeve 720 in the front-back direction. The energy storage component 420 is limited in the front-back direction by the rear end face of the energy storage component 420 and the front end face of the support sleeve 720, thereby improving the structural stability of the energy storage component 420. As an optional solution in this embodiment, when the thickness of the rotating member 410 is large, a groove for accommodating the energy storage member 420 can be opened on the outer peripheral wall of the rotating member 410, and the energy storage member 420 can be placed in the groove on the outer peripheral wall of the rotating member 410, so that the energy storage member 420 is limited in front and behind.

[0084] Combination Figure 14In this embodiment, the rear end of the deflector 430 is sleeved on the outer periphery of the front part of the rotating member 410. The inner peripheral wall of the rear end of the deflector 430 is provided with protruding teeth 461, and the rotating member 410 is provided with swingable ratchet teeth 462. When the rotating member 410 rotates in the forward direction, the ratchet teeth 462 slip relative to the protruding teeth 461, so that the rotating member 410 and the deflector 430 are in a disengaged state. When the rotating member 410 rotates in the reverse direction, the ratchet teeth 462 abut against the protruding teeth 461, so that the rotating member 410 and the deflector 430 are in a engaged state. Specifically, the inner peripheral wall of the rear end of the deflector 430 is provided with a ring of protruding teeth 461 evenly distributed circumferentially, and the ratchet teeth 462 are rotatably located on the front side of the rotating member 410 via a pin 463. The shifting component 430 also includes an elastic element 464, one end of which is positioned and the other end of which contacts the ratchet 462. The elastic element 464 pushes the ratchet 462 against the protrusion 461. The elastic element 464 is preferably a compression spring 464a. When the rotating component 410 rotates forward in the direction shown by γ in Figure 14, the ratchet 462 is pushed against by the protrusion 461, overcoming the preload of the compression spring 464a, and swings towards the center of the rotating component 410. The ratchet 462 is in a slipping state relative to the protrusion 461. At this time, the shifting component 430 and the forward-rotating rotating component 410 are in a state of transmission separation, and the forward-rotating rotating component 410 cannot drive the shifting component 430 to rotate. The rotating component 410 rotates along... Figure 14 When rotating in the opposite direction as shown in the middle-γ direction, the ratchet 462 is in a stable contact with the convex tooth 461 under the preload of the compression spring 464a. At this time, the shifting member 430 and the rotating member 410 rotating in the opposite direction are in a transmission engagement state. The rotating member 410 rotating in the opposite direction can drive the shifting member 430 to rotate in the same direction through the cooperation of the ratchet 462 and the convex tooth 461.

[0085] Combination Figure 9 In this embodiment, the front side of the rotating member 410 is provided with a recessed area 413 that is recessed from the front surface to the rear. The ratchet 462 is rotatably disposed in the recessed area 413 by means of a pin 463. The thickness of the ratchet 462 in the front-rear direction is slightly less than the depth of the recessed area 413 in the front-rear direction, so that the ratchet 462 can be completely accommodated in the recessed area 413, preventing the front surface of the ratchet 462 from protruding forward from the front surface of the rotating member 410. Preferably, the toggle assembly 400 also includes a baffle 470 sandwiched between the front surface of the rotating member 410 and the stepped surface on the inner wall of the toggle member 430. The ratchet 462 is limited in the recessed area 413 by the baffle 470. The outer diameter of the baffle 470 is basically equal to or slightly smaller than the outer diameter of the rotating member 410. The tip of the ratchet 462 can extend circumferentially out of the recessed area 413 and abut against the protruding tooth 461.

[0086] To ensure the transmission engagement strength between the rotating component 410 and the shifting component 430, in this embodiment, two ratchet teeth 462 are evenly spaced along the axial direction of the rotating component 410. Correspondingly, two compression springs 464a are also provided, each corresponding to one of the ratchet teeth 462. To ensure the structural stability of the compression springs 464a, in this embodiment, the recessed area 413 has a positioning groove 414 on the cavity wall facing the tip of the ratchet tooth 462. Figure 15 The ratchet 462 has a protrusion 465 protruding towards the positioning groove 414. One end of the compression spring 464a is inserted into the positioning groove 414 and abuts against the rotating part 410 to achieve positioning. The other end of the compression spring 464a is sleeved on the outside of the protrusion 465 and abuts against the ratchet 462. The positioning groove 414 and the protrusion 465 provide a certain positioning effect to both ends of the compression spring 464a, ensuring that the compression spring 464a can apply a stable force to the ratchet 462. It is understood that the number of ratchet 462 and compression spring 464a can also be one, three, four, or other reasonable numbers, and no further restrictions are imposed here.

[0087] Combination Figure 4 , Figure 16 A meshing structure 480 is provided between the front end of the rotating component 430 and the rear end of the jaw 110. The rotating component 410 drives the jaw 110 to rotate through the meshing structure 480. Specifically, the front end face of the rotating component 430 is provided with several first meshing blocks 431 distributed circumferentially, and the annular rear end face formed by the engagement of the jaws 110 is provided with several second meshing blocks 112 distributed circumferentially. When the pipe expanding mold 100 is installed at the front end of the pipe expanding machine, the first meshing blocks 431 and the second meshing blocks 112 are interlocked and meshed to form the meshing structure 480. The rotating component 410 drives the rotating component 430 to rotate synchronously through the meshing structure 480 via the engagement of the ratchet 462 and the convex tooth 461.

[0088] In this embodiment, the pipe expander also includes a connecting sleeve 730, which is fixed inside the housing 600. The front end of the connecting sleeve 730 extends forward out of the housing 600. The connecting sleeve 730 is sleeved on the outer periphery of the front part of the rotating component 430 and axially limits the rotating component 430. There is a certain gap between the connecting sleeve 730 and the rotating component 430 to avoid the connecting sleeve 730 causing rotational interference to the rotating component 430. The outer peripheral wall of the connecting sleeve 730 is provided with external threads, and the inner peripheral wall of the rear end of the annular seat 120 in the pipe expander mold 100 is provided with internal threads. The annular seat 120 is detachably and fixedly connected to the front end of the connecting sleeve 730 through the cooperation of the internal and external threads. Each claw 110 is opened by the action of the ejector pin 200, and each claw 110 can be rotated by the rotating component 430.

[0089] Combination Figure 17 , Figure 18When pipe expansion is required, a pipe expansion mold 100 of appropriate size is selected according to the inner diameter of the pipe and installed at the front end of the pipe expander through the cooperation with the connecting sleeve 730. When the pipe expander is working, the motor 310 drives the rotating shaft 510 to rotate in the direction shown by ω through the reduction mechanism 320. The rotating shaft 510 drives the cam 520 to rotate synchronously. The rotating cam 520 drives the ejector pin 200 to move forward against the preload of the return spring 710 through the contact cooperation with the roller 230. The forward-moving ejector pin 200 compresses the return spring 710 and causes each claw 110 to open outward. The opened claw 110 forces the end of the pipe to open. Meanwhile, the forward-moving ejector pin 200 drives the rotating member 410 to rotate in the direction shown by γ through the cooperation of the linkage block 442 and the linkage groove 441. The forward-rotating rotating member 410 stretches the tension spring 420a, which is a power storage member 420. Furthermore, the forward-rotating rotating member 410 causes the ratchet 462 to slip relative to the convex tooth 461. The shifting member 430 and the forward-rotating rotating member 410 are in a state of transmission separation. The rotating member 410 will not drive the shifting member 430 to rotate, so that each pawl 110 will not rotate circumferentially when performing the expansion action.

[0090] After the ejector pin 200 moves forward to its position, the cam 520 releases the ejector pin 200. When the cam 520 releases the ejector pin 200, each pawl 110 ends its opening action. The return spring 710, which restores its deformation, drives the ejector pin 200 to move backward to reset. The ejector pin 200, which moves backward, releases each pawl 110. Under the action of the gathering spring 130, each pawl 110 gradually closes. During the process of the reset spring 710 driving the ejector pin 200 to move backward to reset, the linkage block 442 moves backward relative to the linkage groove 441. The tension spring 420a, which restores its deformation, applies force to the rotating member 410, causing the rotating member 410 to rotate in the opposite direction as shown in -γ. At this time, the ratchet 462 abuts against the convex tooth 461 under the action of the compression spring 464a. The rotating member 430 and the rotating member 410 rotating in the opposite direction are in a state of transmission engagement. The rotating member 410 rotating in the opposite direction drives the rotating member 430 to rotate in the same direction through the cooperation of the ratchet 462 and the convex tooth 461. The rotating member 430 drives each pawl 110 to rotate at a certain angle relative to the expanded tube during the closing process through the meshing structure 480. When the ejector pin 200 moves backward to the position, the cam 520 can drive the ejector pin 200 to move forward again, causing each pawl 110 to open and expand the tube.

[0091] When the pawl 110 is stuck and cannot be smoothly rotated by the rotary member 430, the rotary member 430 and the rotating member 410 also cannot rotate circumferentially when the ejector pin 200 moves backward. In this case, since the linkage groove 441 extends in the front-back direction, the linkage block 442 and the rotating member 410 will not get stuck. The ejector pin 200 can still move backward smoothly to reset under the drive of the reset spring 710. The backward movement of the ejector pin 200 causes the cone head 220 to release the pawl 110. The released pawl 110 can gradually retract under the action of the gathering spring 130, thereby automatically eliminating the situation where the pawl 110 is stuck and cannot rotate.

[0092] In this embodiment, since the rotation of the rotating component 410 is driven by the force applied by the tension spring 420a that recovers its deformation, the rotational power of the rotating component 410 does not come directly from the motor 310. Therefore, when the rotating component 410 stalls, it will not cause an increase in the load on the motor 310, which is beneficial to ensuring the service life of the motor 310.

[0093] Example 2

[0094] Combination Figure 19 , Figure 20 , Figure 21 The tube expander 10 is equipped with a control board 810 and a switch 820 located inside the housing 600. The motor 310 of the drive unit 300 is controlled by the control board 810, and the switch 820 is electrically connected to the control board 810 and used to start and stop the motor 310. The ejector pin 200 driven by the motor 310 reciprocates between the initial position and the ejection position. The process of the ejector pin 200 moving forward from the initial position to the ejection position and then moving backward from the ejection position to the initial position constitutes the motion cycle of the ejector pin 200. The switch 820 used to start and stop the motor 310 can indirectly start and stop the motion cycle of the ejector pin 200.

[0095] Based on this, the tube expander 10 also includes a detection element 830, which is electrically connected to the control board 810 and used to directly or indirectly detect the position of the ejector pin 200. In this embodiment, to enable the detection element 830 to successfully detect the position of the ejector pin 200, the tube expander 10 further includes a trigger element 840 that is synchronized with the ejector pin 200. At a predetermined node in the motion cycle, the trigger element 840 moves to a position corresponding to the detection element 830 and triggers the detection element 830, so that the detection element 830 detects the position of the ejector pin 200. Specifically, the synchronization between the trigger element 840 and the ejector pin 200 means that the trigger element 840 and the ejector pin 200 maintain consistent movement during the motion cycle of the ejector pin 200, so that the trigger element 840 can directly or indirectly reflect the position of the ejector pin 200. For example, the trigger 840 can be set on the ejector pin 200 to directly provide feedback on the position of the ejector pin 200. The trigger 840 can also be set on the pin 240 or the cam 520 to indirectly provide feedback on the position of the ejector pin 200. The trigger 840 can also be set on the planetary gear of the reduction mechanism 320, the planet carrier of the reduction mechanism 320, or the rotating part of the motor 310 to indirectly provide feedback on the position of the ejector pin 200. In this embodiment, the setting position of the trigger 840 is not specifically limited. In this specific embodiment, the detection element 830 can be a magnetic sensor such as a Hall effect sensor or a reed switch, in which case the trigger element 840 is set as a magnet; the detection element 830 can also be a photoelectric sensor, in which case the trigger element 840 can be set as a light-blocking plate, a light-reflecting part, or a hole for light to pass through, depending on the specific type of photoelectric sensor; the detection element 830 can also be a micro switch, in which case the trigger element 840 is set as a protrusion or pin that can be used to press the spring of the micro switch; this embodiment does not specifically limit the type of the detection element 830, and the trigger element 840 can be reasonably set according to the type of the detection element 830.

[0096] In this embodiment, the handle 610 is provided with an operating element 850 corresponding to the switch 820, which is operated by the user. The switch 820 is normally in the off state. When the user presses the operating element 850, the operating element 850 triggers the switch 820, switching it from the off state to the on state. When the user releases the operating element 850, the operating element 850 releases the switch 820, switching it from the on state to the off state. In a specific embodiment, the switch 820 can be a micro switch, in which case the operating element 850 is configured as a trigger or button to trigger the micro switch; the switch 820 can also be a touchscreen switch, in which case the operating element 850 is not required; of course, the switch 820 can also be of other types, and the operating element 850 only needs to be configured to meet the requirements for triggering the switch according to the type of switch.

[0097] When the user presses the operating component 850 to switch the switch 820 from the off state to the on state, the control board 810 commands the motor 310 to be powered on and work according to the on signal of the switch 820. The motor 310 drives the ejector pin 200 to move through the reduction mechanism 320 and the transmission structure 500, and the ejector pin 200 starts the motion cycle. To ensure that each jaw 110 is in the retracted state after each user operation, when the user releases the operating component 850 before the ejector pin 200 returns to its initial position, the switch 820 switches from the on state to the off state. At this time, the motor 310 is still energized. Until the ejector pin 200 returns to its initial position, causing the trigger component 840 to align with the detection component 830 so that the detection component 830 is triggered by the trigger component 840, the control board 810 determines that the ejector pin 200 is in the initial position and the jaw 110 is in the retracted state, i.e., the ejector pin 200 has reached the predetermined node of the motion cycle. Based on this, the control board 810 commands the motor 310 to stop to stop the drive, so that the ejector pin 200 stops in the initial position after each user operation, thereby ensuring that the jaws 110 of the expansion mold 100 are in the retracted state after each user operation, making it convenient for the user to remove the expansion mold 100 from the pipe fitting.

[0098] Of course, the predetermined node of the ejector pin 200 motion cycle is not limited to the initial position of the ejector pin 200, but can also be set at other positions besides the ejection position.

[0099] The other structures and / or contents of Embodiment 2 are the same as those of Embodiment 1, and will not be repeated here.

[0100] In addition to the preferred embodiments described above, there are other embodiments of this utility model. Those skilled in the art can make various changes and modifications based on this utility model. As long as they do not depart from the spirit of this utility model, they should all fall within the scope defined in the claims of this utility model.

Claims

1. Pipe expander, including: The tube expansion mold includes multiple circumferentially distributed clamps that can be retracted or opened; The ejector pin can move back and forth. When the ejector pin moves forward, it causes the clasp to open under force, and when the ejector pin moves backward, it releases the clasp so that the clasp can close. The driving component is used to drive the movement of the ejector pin; A rotary assembly is used to drive the fully opened chuck to rotate. Its features are, The toggle assembly includes a rotatable rotating component, a power storage component connected to the rotating component, and a toggle component for driving the chuck to rotate. The toggle component is located between the rotating component and the chuck and is used to transmit the toggle action. The rotating component and the toggle component can be engaged or disengaged through transmission. The forward-moving ejector pin drives the rotating component to rotate in the forward direction. The forward-rotating rotating component causes the energy storage component to undergo elastic deformation so that the energy storage component can complete the energy storage. Furthermore, the forward-rotating rotating component is disengaged from the turning component. During the backward movement of the ejector pin, the accumulator recovers its elastic deformation and drives the rotating component to rotate in the opposite direction. The rotating component in the opposite direction engages with the shifting component to shift the pawl.

2. The pipe expander of claim 1, wherein The rotating component is sleeved on the outer periphery of the ejector pin. One of the outer peripheral wall of the ejector pin and the inner peripheral wall of the rotating component is provided with a linkage groove, and the other is provided with a linkage block. At least a part of the groove wall of the linkage groove is twisted or tilted relative to the central axis of the ejector pin. The linkage block is inserted into the linkage groove. The ejector pin moving forward drives the rotating component to rotate in the forward direction through the cooperation of the linkage groove and the linkage block.

3. The pipe expander of claim 1, wherein The pipe expander includes a fixed support sleeve, a rotatable rotating component located inside or outside the support sleeve, one end of a power storage component connected to the rotating component, and the other end of the power storage component connected to the support sleeve.

4. The pipe expander of claim 3, wherein The rotating component is provided with a positioning block, and one end of the energy storage component is provided with a first connecting foot that hooks with the positioning block; and / or, the support sleeve is provided with a fixing block, and the other end of the energy storage component is provided with a second connecting foot that hooks with the fixing block.

5. The pipe expander of claim 3, wherein One of the rotating component and the support sleeve is provided with a limiting block, and the other is provided with a limiting groove extending in the circumferential direction. The limiting block is inserted into the limiting groove to limit the rotation angle of the rotating component.

6. The pipe expander of claim 1, wherein, The energy storage component is located on the outer periphery of the rotating component, and the energy storage component is limited in the front-to-back direction.

7. The pipe expander of claim 1, wherein The rotating component is sleeved on the outer periphery of the ejector pin. The inner peripheral wall of the rotating component is provided with protruding teeth, and the rotating component is provided with swingable ratchet teeth. The rotating component rotates in the forward direction, causing the ratchet teeth to slip relative to the protruding teeth so that the rotating component and the rotating component are in a state of transmission separation. The rotating component rotates in the reverse direction, causing the ratchet teeth to abut against the protruding teeth so that the rotating component and the rotating component are in a state of transmission engagement.

8. The pipe expander of claim 7, wherein, The rotating component is provided with an elastic element with one end positioned and the other end in contact with the ratchet. The elastic element biases the ratchet toward the convex tooth.

9. The pipe expander of claim 7, wherein, The ratchet is located on the front side of the rotating component, and the protruding teeth are located on the inner peripheral wall of the rear end of the rotating component.

10. The pipe expander of claim 1, wherein, The pipe expander also includes a fixed connecting sleeve located outside the rotating part. The pipe expander mold also includes an annular seat, with the rear ends of each claw connected to the annular seat. The pipe expander mold is connected to the connecting sleeve through the annular seat so that the claws engage with the rotating part.

11. The pipe expander according to claim 1, characterized in that, The ejector pin has a motion cycle; The pipe expander is equipped with a control panel, detection components, and switches; The detection element is electrically connected to the control board and is used to directly or indirectly detect the position of the ejector pin; The switch is electrically connected to the control board and is used to start and stop the motion cycle. The control board changes the state of the switch to stop the drive unit from driving the ejector pin at a predetermined node of the motion cycle.

12. The tube expander according to claim 11, characterized in that, The tube expander is equipped with a trigger that is synchronized with the ejector pin; The trigger activates the detector at a predetermined node in the motion cycle, so that the detector detects the position of the ejector pin.

13. The pipe expander according to claim 11, characterized in that, The pipe expander is equipped with operating components corresponding to the switch settings; The switch has an on state when the operating element is pressed and an off state when the operating element is released; When the switch is switched from the ON state to the OFF state, the control board causes the drive to stop driving the ejector pin at a predetermined node; And / or, The movement cycle of the ejector pin has an initial position corresponding to the retracted claw, and the predetermined node of the movement cycle is the initial position of the ejector pin.

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