Pipe expanding machine

Abstract

The utility model discloses a pipe expanding machine, which belongs to the technical field of electric tools and comprises an expanding component, an ejector rod, a motor and an intermittent turning component, the motor drives each claw to intermittently rotate around a central axis through the intermittent turning component, the intermittent turning component comprises a turning piece and a transmission shaft, the turning piece is rotatably sleeved outside the ejector rod, and the transmission shaft is sleeved outside the ejector rod. The transmission shaft is parallel to the ejector rod, the rear end of the transmission shaft is in transmission connection with the motor, the transmission shaft is driven by the motor to rotate around the central axis of the transmission shaft, and an intermittent transmission matching structure is arranged between the front end of the transmission shaft and the shifting piece; and the rotating transmission shaft drives the shifting piece to intermittently rotate through the intermittent transmission matching structure. The structure of the ejector rod is reasonably simplified, the situation that the ejector rod is prone to rotation blocking due to the fact that the ejector rod needs to drive the shifting piece to rotate is avoided, and meanwhile the front-back moving smoothness of the ejector rod and the smoothness that the intermittent shifting assembly drives the clamping jaw to rotate are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric tools, in particular to a pipe expanding machine. Background Art

[0002] Pipe expanders are mainly used for connecting pipes. When in use, first use the pipe expander to expand one end of the pipe, then insert the other pipe into the expanded end of the pipe, and then use a crimping tool to press the two pipes together to complete the connection. In actual operation, in order to improve the expansion effect of the pipe, it is generally necessary to expand the end of the pipe multiple times. Usually, after each expansion action, the clamping claws are retracted and rotated to a certain angle before expanding again until the clamping claws rotate roughly one circle. In order to improve work efficiency, some existing pipe expanders are designed with a dial structure that can intermittently drive the clamping claws to rotate a certain angle after the expansion action is completed. However, the existing dial structure is generally driven directly by the push rod that drives the clamping claws to retract and expand. The structure of the push rod is relatively complex and easily causes the push rod to be blocked, which is not conducive to improving the user experience. Utility Model Content

[0003] In order to solve the shortcomings and deficiencies in the above-mentioned prior art, the utility model provides a pipe expander, which reasonably simplifies the structure of the push rod, avoids the situation where the push rod is easily blocked due to the need to drive the dial to rotate, and at the same time improves the smoothness of the forward and backward movement of the push rod and the smoothness of the intermittent dial assembly driving the claw to rotate.

[0004] In order to achieve the above technical objectives, the present invention provides a pipe expanding machine, comprising:

[0005] An expansion assembly includes an annular seat and a plurality of claws distributed circumferentially along the annular seat, wherein the rear end of each claw is connected to the annular seat, and each claw has a retracted state and an extended state;

[0006] A push rod, the front end of which is provided with a tapered portion. When the push rod moves forward, the tapered portion causes each claw to switch from a retracted state to an open state. When the push rod moves backward, the tapered portion releases each claw so that each claw can switch from an open state to a retracted state.

[0007] The motor drives the ejector rod to move forward and backward through the transmission structure;

[0008] The pipe expander further comprises an intermittent rotating assembly, through which the motor drives each claw to intermittently rotate around the central axis;

[0009] The intermittent dial assembly includes a dial member and a transmission shaft. The dial member can be rotatably mounted on the outside of the push rod. The front end of the dial member can engage with the rear end of the claw. The transmission shaft is arranged parallel to the push rod and the rear end is connected to the motor. The transmission shaft is driven by the motor to rotate around its own central axis. An intermittent transmission matching structure is provided between the front end of the transmission shaft and the dial member. The rotating transmission shaft drives the dial member to rotate intermittently through the intermittent transmission matching structure.

[0010] Preferably, the intermittent transmission matching structure includes a convex ring provided on the dial member and a shift rod eccentrically provided at the front end of the transmission shaft. The circumferential outer wall of the convex ring is provided with a plurality of circumferentially spaced grooves. The transmission shaft rotates one circle so that the shift rod intermittently matches with one of the grooves, so that the transmission shaft drives the dial member to rotate intermittently through the intermittent transmission matching structure.

[0011] Preferably, an arc-shaped concave surface located between two adjacent grooves is provided on the circumferential outer wall of the convex ring, a convex column is provided at the front end of the transmission shaft, and an arc-shaped convex surface matching the arc-shaped concave surface is provided on the circumferential outer wall of the convex column. The center line of the arc-shaped convex surface coincides with the center axis of the transmission shaft, and the rotating transmission shaft can make the arc-shaped convex surface contact with the arc-shaped concave surface.

[0012] Preferably, the dial member includes a front dial wheel and a rear dial wheel distributed front and back, a convex ring is provided on the rear dial wheel, the front end of the front dial wheel can be engaged with the rear end of the claw, and the rear end of the front dial wheel and the front end of the rear dial wheel can be connected in a clutch transmission.

[0013] Preferably, the rear end of the front paddle is provided with a plurality of front convex teeth distributed along the circumferential space, and the front end of the rear paddle is provided with a plurality of rear convex teeth distributed along the circumferential space, the rear convex teeth and the front convex teeth engage with each other to enable the rear paddle to be transmission-engaged with the front paddle, and the rear convex teeth slide backward relative to the front convex teeth to enable the rear paddle to be transmission-disconnected with the front paddle.

[0014] Preferably, a linear spring is sleeved on the outside of the push rod, the front end of the linear spring contacts the rear paddle and the rear end of the linear spring contacts the push rod, the linear spring applies a preload force to the rear paddle to keep the rear paddle and the front paddle in transmission engagement, and the push rod moving forward compresses the linear spring.

[0015] Preferably, the transmission structure includes a rotating shaft driven by a motor, and a gear matching structure is provided between the rear end of the transmission shaft and the rotating shaft. The motor drives the transmission shaft to rotate around its own central axis through the rotating shaft and the gear matching structure.

[0016] Preferably, the transmission structure includes a cam sleeved on the rotating shaft and a roller provided at the rear end of the push rod, the circumferential outer wall of the cam is provided with an involute push surface, an avoidance surface smoothly connected to the distal end of the push surface, and a transition surface provided between the proximal end of the push surface and the avoidance surface, the rotating cam drives the push rod forward through the interference between the push surface and the roller, and the rotating cam loosens the roller through the avoidance surface so that the push rod can move backward.

[0017] Preferably, the pipe expander includes a seat sleeve arranged on the outside of the push rod, the seat sleeve is provided with a slide groove extending forward and backward, the roller is arranged on the rear end of the push rod through a pin rod, and the end of the pin rod is inserted into the slide groove.

[0018] Preferably, the pipe expander comprises an annular sleeve body which is sleeved on the outside of the rotating member for axial limitation, and a threaded fitting structure is provided between the annular seat and the annular sleeve body.

[0019] After adopting the above technical solution, the utility model has the following advantages:

[0020] 1. The pipe expander provided by the present invention has an intermittent dial assembly including a dial and a transmission shaft. The transmission shaft is driven by a motor to rotate around its own central axis. The rotating transmission shaft drives the dial to rotate intermittently through an intermittent transmission matching structure. The intermittently rotating dial drives the claw to rotate synchronously and intermittently, so that the claw can rotate a certain angle relative to the pipe. The transmission shaft is arranged in parallel with the mandrel, and the dial can be rotatably sleeved on the outside of the mandrel. Since the transmission shaft is directly driven by the motor, there is no need to set a matching structure for driving the dial to rotate between the mandrel and the intermittent dial assembly. The structure of the mandrel can be reasonably simplified to avoid the mandrel from being easily blocked due to the need to drive the dial to rotate. At the same time, the smoothness of the mandrel's forward and backward movement and the smoothness of the intermittent dial assembly driving the claw to rotate are improved, which is conducive to improving the user experience. Since the intermittent dial assembly is arranged between the front end of the transmission shaft and the dial piece, when the motor is working, the transmission shaft is always in a rotating state driven by the motor. The rotating transmission shaft can timely drive the dial piece to intermittently rotate a certain angle through the intermittent transmission matching structure. The intermittently rotating dial piece can drive each claw to synchronously rotate intermittently a certain angle. Since the transmission shaft is always in a rotating state, the timeliness and smoothness of the intermittent rotation of the dial piece driven by the intermittent transmission matching structure can be ensured.

[0021] 2. A convex ring is provided on the toggle member, and a slot is provided on the convex ring. An eccentric lever is provided at the front end of the transmission shaft. During one rotation of the transmission shaft, the lever can enter the slot and intermittently cooperate with the convex ring. The transmission shaft can drive the toggle member to intermittently rotate a certain angle through the cooperation of the lever and the slot, thereby causing the toggle member to intermittently rotate the claw a certain angle. The intermittent transmission cooperation structure is reasonably set to ensure that the toggle member can drive the claw to intermittently rotate.

[0022] 3. When the shift lever and the slot are disengaged from each other, the arc-shaped convex surface on the boss contacts and cooperates with the arc-shaped concave surface on the convex ring. The cooperation between the arc-shaped convex surface and the arc-shaped concave surface improves the relative position stability of the transmission shaft and the shift member, and improves the smoothness of the shift lever entering the slot and cooperating with the slot to drive the shift member to rotate intermittently.

[0023] 4. The shifter preferably adopts a split structure with a front paddle and a rear paddle. The cam is located on the rear paddle, and the rear end of the front paddle and the front end of the rear paddle can be connected by a clutch transmission. When the torque between the rear paddle and the front paddle is too large, the rear paddle can be disengaged from the front paddle in time, improving the operating safety of the intermittent shifting assembly and ensuring the structural stability of the shifter. It also prevents abnormalities caused by motor overload caused by excessive torque on the rear paddle.

[0024] 5. The rear end of the front paddle is provided with front cam teeth, and the front end of the rear paddle is provided with rear cam teeth. When the front cam teeth and the rear cam teeth engage with each other, the front and rear paddle wheels are coupled in transmission, and the rotating rear paddle wheel can drive the front paddle wheel to rotate synchronously, so that the front paddle wheel drives each claw to rotate a certain angle. When the claw is clamped, the front paddle wheel requires a large force to drive the claw to rotate intermittently. When the rotating rear paddle wheel cannot smoothly drive the front paddle wheel to rotate synchronously through the cooperation of the rear cam teeth and the front cam teeth, the rear cam teeth slip relative to the front cam teeth, and the rear paddle wheel and the front paddle wheel are separated in transmission. The transmission coordination structure between the front and rear paddle wheels is reasonably set so that the front and rear paddle wheels can be disconnected in time, avoiding damage to the intermittent dial assembly due to excessive transmission force, and preventing the motor from burning out due to excessive load, thereby ensuring the structural stability of the intermittent dial assembly and the working performance stability of the motor.

[0025] 6. The front end of the linear spring is in conflict with the rear paddle, and the linear spring applies a preload force to the rear paddle to bias the rear paddle toward the front paddle, so that the rear teeth and the front teeth of the rear paddle are kept in a state of mutual engagement under normal conditions. When the rear teeth slip relative to the front teeth, the rear paddle can overcome the preload force applied by the linear spring and move backward so that the rear paddle can be separated from the front paddle transmission. The rear end of the linear spring is in conflict with the push rod. When the motor drives the push rod forward, the linear spring is deformed by force. When the push rod needs to move from front to back for reset, the linear spring that restores the deformation can apply force to the push rod to move the push rod from front to back. Reasonable setting of the linear spring and the use of the linear spring to simultaneously achieve preload of the rear paddle and reset of the push rod are conducive to reasonable simplification of the overall structure.

[0026] 7. A gear matching structure is set between the rear end of the transmission shaft and the rotating shaft. The motor drives the transmission shaft to rotate around its own central axis through the rotating shaft and the gear matching structure. The transmission matching structure between the transmission shaft and the motor is reasonably set so that the motor can smoothly drive the transmission shaft, thereby allowing the motor to smoothly drive the intermittent dial assembly.

[0027] 8. A cam is mounted on the rotating shaft, with a push surface, a relief surface, and a transition surface. The motor drives the ejector forward through the rotating shaft, cam, and roller. When the cam rotates until the relief surface aligns with the roller, the cam releases the roller, allowing the ejector to move back to its original position. A well-designed transmission structure between the motor and the ejector ensures smooth motor drive.

[0028] 9. A seat cover is provided on the outside of the push rod, and a slide groove is provided on the seat cover. The roller is provided at the rear end of the push rod through a pin rod, and the end of the pin rod is inserted into the slide groove. When the push rod moves back and forth, the pin rod is always located in the slide groove of the seat cover. The push rod is limited by the cooperation of the pin rod and the slide groove, thereby ensuring the stability of the push rod's forward and backward movement.

[0029] 10. The annular sleeve is axially limited and is sleeved on the outside of the dial. A threaded fitting structure is provided between the annular sleeve and the annular seat of the expansion assembly. The expansion assembly can be detachably connected to the annular sleeve through the threaded fitting structure, so that the claw can be driven by the push rod to expand, and the claw can also be driven by the dial to rotate intermittently. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a partial structural diagram of the pipe expanding machine in Example 1;

[0031] Figure 2 This is an exploded view of part of the structure of the pipe expander in Example 1;

[0032] Figure 3 This is a structural diagram of the expansion assembly in the pipe expander of Example 1;

[0033] Figure 4 An axial cross-sectional view of an expansion assembly in a pipe expander according to Example 1;

[0034] Figure 5 This is a structural diagram of the cam in the pipe expanding machine of Example 1;

[0035] Figure 6 This is a diagram showing the coordination structure of the intermittent rotating assembly in the pipe expanding machine of Example 1;

[0036] Figure 7a A side view of the intermittent rotation assembly in the pipe expanding machine of Example 1 when the shifting rod is about to enter the slot;

[0037] Figure 7b A side view of the intermittent rotation assembly in the pipe expanding machine of Example 1 when the shifting rod is about to be released from the slot;

[0038] Figure 8a 、 Figure 8b This is a structural diagram of the front dial in the pipe expanding machine of Example 1;

[0039] Figure 9 This is a structural diagram of the rear dial wheel in the pipe expanding machine of Example 1;

[0040] Figure 10 This is a partial structural diagram of the pipe expander in Example 1 when the jaws are in a retracted state;

[0041] Figure 11 This is a partial structural diagram of the pipe expander in Example 1 when each jaw is in an open state.

[0042] In the figure, 100-expansion component, 110-annular seat, 111-annular groove, 120-claw, 121-arc-shaped convex edge, 122-second boss, 123-second concave notch, 130-gathering spring,

[0043] 200-rod, 210-conical part, 220-lug,

[0044] 300-motor,

[0045] 400-intermittent dial assembly, 410-dial member, 411-front dial wheel, 4111-first boss, 4112-first recess, 4113-front convex tooth, 412-rear dial wheel, 4121-rear convex tooth, 420-transmission shaft, 421-dial lever, 422-thickened portion, 423-convex column, 424-arc-shaped convex surface, 430-convex ring, 431-slot, 432-arc-shaped concave surface, 440-intermittent transmission matching structure,

[0046] 500- transmission structure, 510- rotating shaft, 520- cam, 521- push surface, 522- avoidance surface, 523- transition surface, 530- roller, 540- pin rod,

[0047] 610-seat cover, 611-slide, 620-linear spring, 630-annular sleeve,

[0048] 700-gear matching structure, 710-driving wheel, 720-driven wheel. DETAILED DESCRIPTION

[0049] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the following terms indicating orientations or positional relationships, such as "upper," "lower," "left," "right," "longitudinal," "lateral," "inner," "outer," "vertical," "horizontal," "top," and "bottom," are based solely on the orientations or positional relationships shown in the accompanying drawings and are intended solely for the purpose of facilitating and simplifying the description of the present invention. They do not indicate or imply that the device or element referred to must have a specific orientation or be constructed or operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0050] Example 1

[0051] Combine Figures 1 to 11 The first embodiment of the present invention provides a pipe expanding machine, comprising:

[0052] The expansion assembly 100 includes an annular seat 110 and a plurality of claws 120 distributed circumferentially along the annular seat 110 . The rear end of each claw 120 is connected to the annular seat 110 , and each claw 120 has a retracted state and an extended state.

[0053] The push rod 200 has a tapered portion 210 at its front end. When the push rod 200 moves forward, the tapered portion 210 causes the claws 120 to switch from a retracted state to an open state. When the push rod 200 moves backward, the tapered portion 210 releases the claws 120, allowing the claws 120 to switch from an open state to a retracted state.

[0054] The motor 300 drives the push rod 200 to move forward and backward through the transmission structure 500;

[0055] The pipe expander further includes an intermittent rotating assembly 400 , through which the motor 300 drives each jaw 120 to intermittently rotate around the central axis;

[0056] The intermittent dial assembly 400 includes a dial member 410 and a transmission shaft 420. The dial member 410 can be rotatably mounted on the outside of the top rod 200. The front end of the dial member 410 can engage with the rear end of the claw 120. The transmission shaft 420 is arranged parallel to the top rod 200 and the rear end is connected to the motor 300. The transmission shaft 420 is driven by the motor 300 to rotate around its own central axis. An intermittent transmission matching structure 440 is provided between the front end of the transmission shaft 420 and the dial member 410. The rotating transmission shaft 420 drives the dial member 410 to rotate intermittently through the intermittent transmission matching structure 440.

[0057] The transmission shaft 420 is arranged parallel to the top rod 200, and the dial member 410 can be rotatably sleeved on the outside of the top rod 200. Since the transmission shaft 420 is directly driven by the motor 300, there is no need to set a matching structure between the top rod 200 and the intermittent dial assembly 400 to drive the dial member 410 to rotate. The structure of the top rod 200 can be reasonably simplified to avoid the top rod 200 from being easily stuck due to the need to drive the dial member 410 to rotate. At the same time, the smoothness of the forward and backward movement of the top rod 200 and the smoothness of the intermittent dial assembly 400 driving the claw 120 to rotate are improved, which is conducive to improving the user experience.

[0058] Combine Figure 3 、 Figure 4In this embodiment, an annular groove 111 is formed on the inner wall of the front end of the annular seat 110. Six claws 120 are provided, arranged one after another along the circumference of the annular seat 110 in a circle. The rear end of each claw 120 extends into the front end of the annular seat 110 and is provided with an outwardly protruding arcuate lip 121. The arcuate lip 121 is embedded in the annular groove 111 to limit the claws 120 axially. A groove is formed on the outer wall of the arcuate lip 121. A gathering spring 130 is provided at the rear end of the claw 120 to clamp the arcuate lip 121 of each claw 120. The gathering spring 130 is embedded in the groove on the outer wall of the arcuate lip 121 and is located within the annular groove 111. The gathering spring 130 applies a preload to the jaws 120, keeping them in a closed state. In this closed state, the jaws 120 are tightly packed together, their front ends forming a tapered head, and the overall outer diameter of the jaws 120 is D1. When the push rod 200 moves forward, causing the jaws 120 to switch from the closed state to the open state under the action of the tapered portion 210, a gap is created between adjacent jaws 120, and the gathering spring 130 is deformed under force, with the overall outer diameter of the jaws 120 becoming D2, where D2>D1. When the push rod 200 moves backward, causing the tapered portion 210 to release the jaws 120, the gathering spring 130, having recovered its deformation, forces the jaws 120 back from the open state to the closed state.

[0059] Combine Figure 1 、 Figure 2 The transmission structure 500 includes a rotating shaft 510 driven by the motor 300, a cam 520 sleeved on the rotating shaft 510, and a roller 530 provided at the rear end of the push rod 200. The rotating shaft 510 is in transmission connection with the output shaft of the motor 300, the cam 520 is fixedly sleeved on the rotating shaft 510 or the cam 520 and the rotating shaft 510 are integrally formed, and the roller 530 is rotatably mounted on the rear end of the push rod 200 via a pin 540. When the motor 300 is working, the cam 520 is driven to rotate via the rotating shaft 510, and the rotating cam 520 drives the push rod 200 forward via the roller 530. Specifically, the motor 300 can drive the rotating shaft 510 to rotate via the reduction structure. Of course, the output shaft of the motor 300 can also directly serve as the rotating shaft 510. The outer diameter of the front end of the mandrel 200 gradually decreases from the back to the front to form a tapered portion 210. The rear end of the mandrel 200 is provided with two lugs 220 that are oppositely arranged and protrude backward. The two ends of the pin 540 are respectively fixedly inserted into the two lugs 220. The axial direction of the pin 540 is preferably perpendicular to the axial direction of the mandrel 200. The roller 530 is sleeved on the outside of the pin 540 and is located between the two lugs 220. The roller 540 can rotate relative to the pin 540. Figure 5 The circumferential outer wall of the cam 520 is provided with a push surface 521, an avoidance surface 522 and a transition surface 523 which are distributed in sequence. Figure 5Point E in the figure represents the proximal end point of the push surface 521, and point F represents the distal end point of the push surface 521. The push surface 521 extends from point E to point F along the involute line, that is, the push surface 521 is substantially an involute arc surface. Figure 5 Point C in the figure represents the central axis of the rotating shaft 510, ⊙D represents a circle with point C as the center and the distance between point C and point F as the radius, and the radial distance between the push surface 521 and the contour line of ⊙D gradually decreases from point E to point F. Figure 5 Point G in the figure represents the dividing point between the avoidance surface 522 and the transition surface 523. One end of the avoidance surface 522 is smoothly connected to the distal end of the push surface 521, and the other end of the avoidance surface 522 is smoothly connected to the transition surface 523. The two ends of the transition surface 523 are smoothly connected to the proximal ends of the avoidance surface 522 and the push surface 521, respectively. When the pipe expander is working, the motor 300 drives the cam 520 along the Figure 5 When the push surface 521 of the cam 520 contacts the roller 530, the cam 520 drives the push rod 200 forward through the contact between the push surface 521 and the roller 530. The forward movement of the push rod 200 causes each claw 120 to switch from the retracted state to the open state. When the cam 520 rotates until the avoidance surface 522 contacts the roller 530, the cam 520 releases the roller 530, and the push rod 200 can move backward to reset and release each claw 120. Under the action of the gathering spring 130, each claw 120 can switch from the open state to the retracted state.

[0060] In order to improve the stability of the push rod 200 in the forward and backward movement, a seat cover 610 is provided on the outer side of the rear end of the push rod 200. The seat cover 610 is fixed and a slide groove 611 extending forward and backward is provided on the seat cover 610. The two ends of the pin rod 540 protrude outward from the lug 220 and are inserted into the slide groove 611. The push rod 200 is limited by the cooperation between the pin rod 540 and the slide groove 611, so that the push rod 200 can basically only move forward and backward.

[0061] Combine Figure 6 、 Figure 7a 、 Figure 7bThe intermittent transmission matching structure 440 includes a raised ring 430 provided on the dial member 410 and a lever 421 eccentrically provided at the front end of the transmission shaft 420. The circumferential outer wall of the raised ring 430 is provided with a plurality of slots 431 spaced apart along the circumference. The transmission shaft 420 rotates one circle so that the lever 421 intermittently matches with one of the slots 431, so that the transmission shaft 420 drives the dial member 410 to rotate intermittently through the intermittent transmission matching structure 440. Specifically, a thickened portion 422 is provided at the front end of the transmission shaft 420, and the lever 421 protrudes forward from the front surface of the thickened portion 422. The dial member 410 includes a front dial wheel 411 and a rear dial wheel 412 distributed front and back. The raised ring 430 is provided at the outer periphery of the rear dial wheel 412. The raised ring 430 can be integrally formed with the rear dial wheel 412, or the raised ring 430 can be formed separately and then fixed to the outer periphery of the rear dial wheel 412. Combination Figure 8a 、 Figure 8b The rear end of the front paddle wheel 411 is provided with a circle of front protruding teeth 4113, and the front end of the front paddle wheel 411 is provided with a plurality of first bosses 4111 spaced apart along the circumference, and a first notch 4112 is formed between two adjacent first bosses 4111. Figure 3 Each claw 120 is combined to form a ring-shaped rear end with a plurality of second bosses 122 spaced apart along the circumferential direction, and a second recess 123 is formed between two adjacent second bosses 122. The first boss 4111 and the second boss 122 are staggered so that the first boss 4111 can be inserted into the second recess 123, and the second boss 122 can be inserted into the first recess 4112, thereby achieving the engagement between the front dial 411 and the claw 120. Figure 9 The inner wall of the front end of the rear dial 412 is provided with a circle of rear protruding teeth 4121. When the front protruding teeth 4113 engage with the rear protruding teeth 4121, the rear dial 412 and the front dial 411 are coupled in transmission. The rotating transmission shaft 420 causes the lever 421 to enter and exit the slot 431. The lever 421, engaged with the slot 431, can drive the protruding ring 430 and the rear dial 412 to rotate synchronously. The rotating rear dial 412 can drive the front dial 411 to rotate through the engagement of the rear protruding teeth 4121 and the front protruding teeth 4113. The rotating front dial 411 can drive each claw 120 to rotate a certain angle through the engagement of the first boss 4111 and the second boss 122.

[0062] In this embodiment, a gear mating structure 700 is provided between the rear end of the transmission shaft 420 and the rotating shaft 510. The rotating rotating shaft 510 drives the transmission shaft 420 to rotate about its own central axis through the gear mating structure 700. Specifically, the gear mating structure 700 includes a driving wheel 710 sleeved on the rotating shaft 510 and a driven wheel 720 sleeved on the rear end of the transmission shaft 420. The driving wheel 710 and the driven wheel 720 are meshed with each other and are axially perpendicular to each other. The transmission shaft 420 can be located above or below the push rod 200. The rotating rotating shaft 510 drives the transmission shaft 420 to rotate about its own central axis through the driving wheel 710 and the driven wheel 720.

[0063] To prevent overloading of the motor 300, a linear spring 620 is sheathed around the outer portion of the push rod 200. The front end of the linear spring 620 contacts the rear paddle 412, while the rear end of the linear spring 620 contacts the push rod 200. The linear spring 620 applies a preload force to the rear paddle 412, maintaining transmission engagement between the rear paddle 412 and the front paddle 411. The forward movement of the push rod 200 compresses the linear spring 620. The linear spring 620 applies a preload force to the rear paddle 412, maintaining engagement between the rear protruding teeth 4121 and the front protruding teeth 4113 of the rear paddle 412 under normal conditions, thereby maintaining transmission engagement between the rear paddle 412 and the front paddle 411. When the rear protruding teeth 4121 slip relative to the front protruding teeth 4113, the rear paddle 412 can overcome the preload force applied by the linear spring 620 and move backward, disengaging the rear paddle 412 from the front paddle 411. The rear end of linear spring 620 contacts push rod 200. When motor 300 drives push rod 200 forward, linear spring 620 deforms under force. When cam 520 releases roller 530, linear spring 620, having recovered its deformation, applies force to push rod 200, causing push rod 200 to move from front to rear, thereby allowing push rod 200 to move backward and return to its original position. Using linear spring 620 to simultaneously preload rear dial 412 and return push rod 200 to its original position facilitates a simplified overall structure.

[0064] Combine Figure 7a 、 Figure 7b The circumferential outer wall of the convex ring 430 is provided with an arcuate concave surface 432 located between two adjacent slots 431. The front end of the transmission shaft 420 is provided with a convex column 423 protruding forward from the front surface of the thickened portion 422. The circumferential outer wall of the convex column 423 is provided with an arcuate convex surface 424 that cooperates with the arcuate concave surface 432. The center line of the arcuate convex surface 424 coincides with the center axis of the transmission shaft 420. The rotating transmission shaft 420 can make the arcuate convex surface 424 contact the arcuate concave surface 432. The cooperation between the arcuate convex surface 424 and the arcuate concave surface 432 improves the relative position stability of the transmission shaft 420 and the dial member 410, and can improve the smoothness of the dial rod 421 entering and exiting the slot 431 and cooperating with the slot 431 to drive the dial member 410 to rotate intermittently. Figure 7aBefore the lever 421 enters the slot 431, the arcuate convex surface 424 contacts the arcuate concave surface 432, so that the lever 421 can smoothly enter the slot 431. Figure 7b When the lever 421 is about to be released from the slot 431 , the arcuate convex surface 424 contacts the arcuate concave surface 432 , so that the lever 421 can be released from the slot 431 smoothly.

[0065] The pipe expander also includes an annular sleeve 630 that is axially limited and sleeved on the outside of the dial member 410. The annular sleeve 630 is preferably fixed. The annular sleeve 630 limits the front dial wheel 411 in front and back directions through the stepped surface on the inner wall, and the annular sleeve 630 limits the rear dial wheel 412 in front and back directions through the cooperation between the rear end surface and the protruding ring 430. A threaded fitting structure is provided between the annular seat 110 of the expansion component 100 and the annular sleeve 630. The expansion component 100 can be detachably connected to the annular sleeve 630 through the threaded fitting structure, so that the user can select the expansion component 100 of the corresponding size according to the diameter of the pipe to be expanded and connect it to the annular sleeve 630. Specifically, the circumferential outer wall at the front end of the annular sleeve 630 is provided with an external thread, and the inner wall at the rear end of the annular seat 110 is provided with an internal thread.

[0066] Combine Figure 10 、 Figure 11 When in use, the expansion assembly 100 is connected to the front end of the annular sleeve 630 through the threaded fitting structure, the first boss 4111 is embedded in the second recess 123, and the second boss 122 is embedded in the first recess 4112, so that the front dial 411 and the claw 120 are engaged. The motor 300 drives the cam 520 to rotate through the rotating shaft 510, so that the push surface 521 and the roller 530 come into contact with each other, and the push rod 200 moves forward. The linear spring 620 is compressed, and each claw 120 opens under the action of the tapered portion 210, and each claw 120 moves from Figure 10 The collapsed state shown switches to Figure 11 The cam 520 rotates to the open state and the gathering spring 130 is deformed by force. The claws 120 switched to the open state force the ends of the tube to expand. When the cam 520 rotates until the avoidance surface 522 corresponds to the roller 530, the cam 520 releases the roller 530, and the linear spring 620 that restores the deformation drives the push rod 200 to move backward. The backward moving push rod 200 causes the conical part 210 to release the claws 120. The gathering spring 130 that restores the deformation drives the claws 120 to move toward the center, so that the claws 120 are moved away from the center. Figure 11 The open state shown switches to Figure 10As the push rod 200 moves backward, the rotating transmission shaft 420 causes the shifting rod 421 to enter the retaining slot 431. The transmission shaft 420, through the engagement of the shifting rod 421 with the retaining slot 431, drives the collar 430 and the rear dial 412 to rotate synchronously by a certain angle. The rotating rear dial 412, through the engagement of the rear protruding teeth 4121 with the front protruding teeth 4113, drives the front dial 411 to rotate synchronously by a certain angle. The rotating front dial 411, through the engagement of the first boss 4111 with the second boss 122, drives the claws 120 to rotate synchronously by a certain angle. The transmission shaft 420, through the shifting member 410, drives the claws 120 to rotate by a certain angle before or when the push rod 200 returns to its initial position, allowing the cam 520 to quickly drive the push rod 200 forward again for tube expansion.

[0067] When the push rod 200 cannot move backward in time to release the tapered portion 210 from the claws 120, or when the claws 120 or the front paddle wheel 411 are stuck, the rear protruding teeth 4121 slip relative to the front protruding teeth 4113, and the rear paddle wheel 412 can overcome the preload force applied by the linear spring 620 and move backward to separate the rear paddle wheel 412 from the front paddle wheel 411, so that the front paddle wheel 411 and the rear paddle wheel 412 can be disconnected from each other in time, avoiding the intermittent dial assembly 400 from being damaged due to excessive transmission force, and avoiding the motor 300 from burning out due to excessive load, thereby ensuring the structural stability of the intermittent dial assembly 400 and the working performance stability of the motor 300.

[0068] Of course, the action of the intermittent rotation assembly 400 driving each claw 120 to rotate a certain angle can also be performed after the push rod 200 moves backward into position. After the rotation of each claw 120 is completed, the cam 520 drives the push rod 200 to move forward again through the roller 530 to expand the pipe.

[0069] Other structures of the pipe expanding machine can refer to the existing technology. For example, the pipe expanding machine also includes a casing, a handle, a switch for controlling start and stop, etc., which will not be described in detail here.

[0070] The tube expander of this embodiment can use a battery pack to supply power to the electrical components of the machine body, or can use a plug to connect to the mains to supply power to the electrical components of the machine body.

[0071] In addition to the above preferred embodiments, the present invention has other implementation methods. Those skilled in the art can make various changes and modifications based on the present invention. As long as they do not depart from the spirit of the present invention, they should all fall within the scope defined in the claims of the present invention.

Claims

1. A pipe expanding machine, comprising: An expansion assembly includes an annular seat and a plurality of claws distributed circumferentially along the annular seat, wherein the rear end of each claw is connected to the annular seat, and each claw has a retracted state and an extended state; A push rod, the front end of which is provided with a tapered portion. When the push rod moves forward, the tapered portion causes each claw to switch from a retracted state to an open state. When the push rod moves backward, the tapered portion releases each claw so that each claw can switch from an open state to a retracted state. The motor drives the ejector rod to move forward and backward through the transmission structure; It is characterized by: The pipe expander further comprises an intermittent rotating assembly, through which the motor drives each claw to intermittently rotate around the central axis; The intermittent dial assembly includes a dial member and a transmission shaft. The dial member can be rotatably mounted on the outside of the push rod. The front end of the dial member can engage with the rear end of the claw. The transmission shaft is arranged parallel to the push rod and the rear end is connected to the motor. The transmission shaft is driven by the motor to rotate around its own central axis. An intermittent transmission matching structure is provided between the front end of the transmission shaft and the dial member. The rotating transmission shaft drives the dial member to rotate intermittently through the intermittent transmission matching structure.

2. A pipe expanding machine according to claim 1, characterized in that: The intermittent transmission matching structure includes a convex ring provided on the dial rotating part and a shift rod eccentrically provided at the front end of the transmission shaft. The circumferential outer wall of the convex ring is provided with a plurality of slots distributed at intervals along the circumference. When the transmission shaft rotates one circle, the shift rod intermittently matches with one of the slots, so that the transmission shaft drives the dial rotating part to rotate intermittently through the intermittent transmission matching structure.

3. The pipe expanding machine according to claim 2, characterized in that: An arc-shaped concave surface located between two adjacent slots is provided on the circumferential outer wall of the convex ring, a convex column is provided at the front end of the transmission shaft, and an arc-shaped convex surface matching the arc-shaped concave surface is provided on the circumferential outer wall of the convex column. The center line of the arc-shaped convex surface coincides with the center axis of the transmission shaft, and the rotating transmission shaft can make the arc-shaped convex surface contact with the arc-shaped concave surface.

4. The pipe expanding machine according to claim 2, characterized in that: The dial member includes a front dial wheel and a rear dial wheel distributed front and back, a convex ring is provided on the rear dial wheel, the front end of the front dial wheel can be engaged with the rear end of the claw, and the rear end of the front dial wheel and the front end of the rear dial wheel can be connected by clutch transmission.

5. The pipe expanding machine according to claim 4, characterized in that: The rear end of the front paddle is provided with a plurality of front convex teeth distributed along the circumferential direction, and the front end of the rear paddle is provided with a plurality of rear convex teeth distributed along the circumferential direction. The rear convex teeth and the front convex teeth engage with each other to enable the rear paddle to be connected with the front paddle, and the rear convex teeth slide backward relative to the front convex teeth to separate the rear paddle from the front paddle.

6. The pipe expanding machine according to claim 4, characterized in that: A linear spring is sleeved on the outside of the push rod, the front end of the linear spring contacts the rear paddle and the rear end of the linear spring contacts the push rod, the linear spring applies a preload force to the rear paddle to keep the rear paddle and the front paddle in transmission engagement, and the push rod moving forward compresses the linear spring.

7. The pipe expanding machine according to claim 1, characterized in that: The transmission structure includes a rotating shaft driven by a motor, and a gear matching structure is provided between the rear end of the transmission shaft and the rotating shaft. The motor drives the transmission shaft to rotate around its own central axis through the rotating shaft and the gear matching structure.

8. The pipe expanding machine according to claim 7, characterized in that: The transmission structure includes a cam sleeved on the rotating shaft and a roller arranged at the rear end of the push rod. The circumferential outer wall of the cam is provided with an involute push surface, an avoidance surface smoothly connected to the distal end of the push surface, and a transition surface arranged between the proximal end of the push surface and the avoidance surface. The rotating cam drives the push rod forward through the interference between the push surface and the roller, and the rotating cam loosens the roller through the avoidance surface to allow the push rod to move backward.

9. The pipe expanding machine according to claim 8, characterized in that: The pipe expander includes a seat sleeve arranged outside the push rod, the seat sleeve is provided with a slide groove extending forward and backward, the roller is arranged at the rear end of the push rod through a pin rod, and the end of the pin rod is inserted into the slide groove.

10. The pipe expanding machine according to claim 1, characterized in that: The pipe expander comprises an annular sleeve body which is sleeved on the outside of the rotating member and is axially limited, and a threaded matching structure is provided between the annular seat and the annular sleeve body.

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