Hand-held portable pipe expansion tool

Abstract

The utility model discloses a handheld portable pipe extension tool, including casing and clamping jaw subassembly, the reciprocating rod that moves in a straight line is equipped in the casing, reciprocating rod moves and controls clamping jaw subassembly to open or gather, the casing is equipped with the rotation subassembly for urging clamping jaw subassembly to rotate, and the rotation subassembly includes movable pin, clutch pin, clutch ring and rotation ring, and the rotation ring is located between clutch ring and clamping jaw subassembly, and the clutch pin is connected on clutch ring, and can move and rotate with clutch ring together, and one side of rotation ring is engaged with clamping jaw subassembly, and the reciprocating rod is provided with track groove, and the movable pin is slidably arranged in the track groove, and the clutch ring is equipped with the linkage hole that links with movable pin, when reciprocating rod is pushed forward by cam assembly, the clutch ring is pushed forward by first spring to form the clamping of clutch pin and rotation ring, and the movable pin moves along the track groove and drives clutch ring to rotate, and the clutch pin drives clamping jaw subassembly to rotate through rotation ring, and the utility model discloses the manufacturing cost, maintenance cost are low.

Description

Technical Field

[0001] This utility model relates to a pipe expansion tool, and more particularly to a handheld portable pipe expansion tool. Background Technology

[0002] Pipe expanders are mainly used for connecting pipes. When using a pipe expander, one end of the pipe is first expanded, and then another pipe is inserted into the expanded end of the pipe. Finally, the two pipes are pressed together with a crimping tool to complete the connection.

[0003] For example, patent CN222429071U discloses a handheld portable pipe expander, which includes a housing with a grip, a motor, a transmission assembly, and a support rod that is restricted to moving in a straight line inside the housing. The transmission assembly converts the rotational power input by the motor into the linear movement of the support rod. An expansion head is mounted on the housing opposite the other end of the support rod. The expansion head is at least partially exposed outside the housing for fitting the pipe to be expanded. The expansion head is surrounded by several expanding claws. When the eccentric gear rotates and pushes the driven gear and the support rod to move synchronously to one side of the expansion head, one end of the support rod is inserted into the expansion head to expand the several expanding claws in a circle to expand the hole. The housing is provided with a second elastic element to provide a restoring force to the several expanding claws to the initial engagement state. This expander is handheld, small in size, easy to operate, and can expand pipes in walls, ceilings, or narrow spaces.

[0004] Existing handheld pipe expanders typically use a front-end gripper assembly to expand the pipe opening. However, the gripper assembly cannot rotate, resulting in uneven pipe expansion when the gripper assembly opens. To solve this problem, existing handheld pipe expanders use a drive gear and a driven gear as a clutch. The drive gear engages with the driven gear through the reciprocating extension and retraction of the spindle assembly, allowing it to automatically rotate when the pipe is expanded, resulting in even expansion of the pipe opening.

[0005] However, due to the high precision requirements of the gears, the manufacturing cost is high, and the large working torque of the extension tool and the impact phenomenon when the teeth are engaged and disengaged can cause tooth cracking or meshing failure. Utility Model Content

[0006] Since the aforementioned component used to drive the gripper assembly to rotate during expansion is a gear, the high precision requirements of the gear result in high manufacturing costs. Furthermore, the large working torque of the expansion tool and the collision phenomenon when the teeth engage and disengage can cause tooth cracking or meshing failure. Therefore, this utility model provides a handheld portable pipe expansion tool.

[0007] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a handheld portable pipe expansion tool, including a housing and a gripper assembly. The gripper assembly can retract or expand. A reciprocating rod that moves along a straight line is provided inside the housing. A cam assembly for pushing the reciprocating rod forward is provided inside the housing and behind the reciprocating rod. A spring for driving the reciprocating rod to move backward and reset is provided inside the housing. The front end of the reciprocating rod is correspondingly arranged with the gripper assembly. The forward movement of the reciprocating rod causes the gripper assembly to expand, and the backward movement of the reciprocating rod releases the gripper assembly, allowing the gripper assembly to retract. The housing contains a rotary assembly for driving the gripper assembly to rotate. The rotary assembly includes a movable pin, a clutch pin, a clutch ring, and a rotating ring. Both the clutch ring and the rotating ring are fitted onto the reciprocating rod. The rotating ring is located between the clutch ring and the gripper assembly. The clutch pin is connected to the clutch ring and can move and rotate with the clutch ring. One side of the rotating ring engages with the gripper assembly, and the other side of the rotating ring has a part for engaging with the clutch pin. The reciprocating rod is provided with a track groove, and the movable pin is slidably disposed in the track groove. The clutch ring is provided with a linkage hole, and the movable pin engages with the clutch ring through the linkage hole. The spring includes a first spring supported between the rear end of the reciprocating rod and the clutch ring, and a second spring supported between the clutch ring and the rotating ring. When the reciprocating rod is pushed forward by the cam assembly, the clutch ring is pushed forward by the first spring until the clutch pin engages with the rotating ring. The movable pin moves along the track groove and drives the clutch ring to rotate. The clutch pin drives the gripper assembly to rotate through the rotating ring.

[0008] A further preferred embodiment of this utility model is as follows: the rotating ring is provided with a plurality of slots on the side near the clutch ring, the plurality of slots being evenly arranged circumferentially, and the slots serving as the parts on the rotating ring for engaging with the clutch pin.

[0009] A further preferred embodiment of this invention is that the elastic force of the second spring is less than that of the first spring.

[0010] A further preferred technical solution of this utility model is as follows: a sleeve is fixed inside the housing, a reciprocating rod is installed inside the sleeve and moves, a clutch ring is clamped between the reciprocating rod and the sleeve, a limiting groove is provided on the sleeve, and a movable pin passes through the linkage hole and is inserted into the limiting groove. When the reciprocating rod is pushed forward by the cam assembly, the clutch ring is pushed forward by the first spring and drives the movable pin to move to the position where it abuts against the front side wall of the limiting groove. As the reciprocating rod moves forward, the front side wall of the limiting groove pushes the movable pin to move along the track groove, so that the movable pin drives the clutch ring to rotate.

[0011] A further preferred embodiment of this utility model is as follows: the track groove includes a first sliding groove opened along the axial direction of the reciprocating rod and a deflection groove located on one side of the front end of the first sliding groove. The rear wall of the deflection groove is inclined, and the rear wall of the limiting groove is also inclined. The rear wall of the deflection groove is used to guide the movable pin from the deflection groove to the first sliding groove when the reciprocating rod moves forward, and the rear wall of the limiting groove is used to guide the movable pin from the first sliding groove to the deflection groove for resetting when the reciprocating rod moves backward.

[0012] A further preferred embodiment of this utility model is as follows: the width of the limiting groove in the axial direction of the sleeve gradually narrows from one end to the other, the limiting groove is a triangular groove, and the front wall of the limiting groove is a straight edge.

[0013] A further preferred technical solution of this utility model is as follows: the linkage hole is an elongated hole opened along the axial direction of the clutch ring, and the width of the linkage hole is equal to the width of the movable pin. When the reciprocating rod moves forward, the linkage hole can drive the movable pin to move forward through the inner wall on the rear side.

[0014] A further preferred technical solution of this utility model is as follows: the side wall of the reciprocating rod is provided with a second sliding groove that runs through both sides of it. The second sliding groove is opened along the axial direction of the reciprocating rod. The clutch ring is provided with connecting holes corresponding to the second sliding groove on both sides. The clutch pin passes through the second sliding groove and the connecting hole, and the two ends of the clutch pin protrude from the outer wall surface on both sides of the clutch ring for engaging with the rotating ring. The second sliding groove has a length for the clutch pin to move inside and a width for the clutch pin to rotate inside.

[0015] A further preferred embodiment of this utility model is as follows: the rear part of the gripper assembly is provided with a plurality of first protrusions, and the front side of the rotating ring is provided with a plurality of second protrusions. The first protrusions and the second protrusions engage with each other, so that the rotating ring can drive the gripper assembly to rotate.

[0016] A further preferred embodiment of this invention is that the slot is a V-shaped slot.

[0017] Compared with the prior art, the advantage of this utility model is that a rotary assembly for driving the gripper assembly to rotate is set inside the housing. The rotary assembly includes a movable pin, a clutch pin, a clutch ring, and a rotating ring. Both the clutch ring and the rotating ring are sleeved on the reciprocating rod. The rotating ring is located between the clutch ring and the gripper assembly. The clutch pin is connected to the clutch ring and can move and rotate with the clutch ring. One side of the rotating ring engages with the gripper assembly, and the other side of the rotating ring has a part for engaging with the clutch pin. The reciprocating rod is provided with a track groove, and the movable pin is slidably disposed in the track groove. The clutch ring is provided with a linkage hole, and the movable pin engages with the clutch ring through the linkage hole. The linkage mechanism includes a first spring supported between the rear end of the reciprocating rod and the clutch ring, and a second spring supported between the clutch ring and the rotating ring. When the reciprocating rod is pushed forward by the cam assembly, the clutch ring is pushed forward by the first spring until the clutch pin engages with the rotating ring. The movable pin moves along the track groove and drives the clutch ring to rotate. The clutch pin drives the gripper assembly to rotate through the rotating ring, so that the gripper assembly can start to rotate automatically when expanding the tube, so that the tube opening is evenly expanded. The use of a pin clutch to replace the precision-manufactured gear clutch reduces manufacturing costs, increases structural strength, and reduces maintenance costs. Attached Figure Description

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model patent; Figure 2 This is a vertical cross-sectional view of the present utility model patent; Figure 3 for Figure 2 A magnified view of part A; Figure 4 This is a cross-sectional view of the present utility model patent; Figure 5 This is a partial vertical cross-sectional view of the gripper assembly in the retracted state; Figure 6 This is a partial transverse cross-sectional view of the gripper assembly in the retracted state. Figure 7 This is a partial vertical cross-sectional view of the movable pin when it moves to the position where it abuts against the front wall of the limiting groove; Figure 8 This is a partial transverse section diagram showing the position where the movable pin moves to the position where it abuts against the front wall of the limiting groove. Figure 9 This is a partial vertical cross-sectional view of the gripper assembly in the open state; Figure 10 This is a partial transverse cross-sectional view of the gripper assembly in the open state. Figure 11 A diagram showing the positional relationship between the movable pin, clutch pin, and reciprocating rod before rotation; Figure 12 A diagram showing the positional relationship between the movable pin, clutch pin, and reciprocating rod after rotation; Figure 13 This is a schematic diagram of the reciprocating rod. Figure 14 This is a schematic diagram of the clutch ring structure; Figure 15 This is a schematic diagram of the rotating ring structure; Figure 16 This is a schematic diagram of the sleeve structure; Figure 17 This is a schematic diagram of the gripper assembly mounted on the mounting base. Figure 18 This is a schematic diagram of the internal structure of the casing.

[0020] In the diagram: 1. Housing; 2. Main housing; 3. Top cover; 4. Fixing base; 5. Gripper; 6. Cam; 7. First wheel axle; 8. Second wheel axle; 9. Support base; 10. Guide groove; 11. Clutch ring; 12. Second spring; 13. Sleeve; 14. Outer ring edge; 15. Inner ring edge; 16. Rotating ring; 17. Reciprocating rod; 18. Arc-shaped protrusion; 19. Converging spring; 20. Annular groove; 21. Clutch pin; 22. Second slide groove; 23. Movable pin; 24. First spring; 25. Roller; 26. First slide groove; 27. Linkage hole; 28. Limiting groove; 29. ​​Connecting hole; 30. Deflection groove; 31. Slot; 32. Second boss; 33. First boss; 34. Track groove. Detailed Implementation

[0021] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0022] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it may not be further defined and explained in subsequent figures.

[0023] Figures 1-18As shown, a handheld portable pipe expander includes a housing 1 and a gripper assembly. The gripper assembly can retract or expand, and expands the pipe by expanding the gripper assembly. A reciprocating rod 17 with a limit on its movement along a straight line is provided inside the housing 1. A cam assembly for pushing the reciprocating rod 17 forward is provided inside the housing 1 and behind it. A spring for driving the reciprocating rod 17 backward to reset is provided inside the housing 1. The front end of the reciprocating rod 17 is correspondingly provided with the gripper assembly. The forward movement of the reciprocating rod 17 opens the gripper assembly, and the backward movement of the reciprocating rod 17 releases the gripper assembly, allowing the gripper assembly to retract. This structure is the same as that of existing portable pipe expanders.

[0024] Figures 2-4 As shown, specifically, a sleeve 13 is fixed inside the housing 1, with the front end of the sleeve 13 extending out of the housing 1. A fixing seat 4 is fixedly connected to the front end of the sleeve 13. The fixing seat 4 is annular. The gripper assembly includes multiple grippers 5 distributed circumferentially along the fixing seat 4. The rear ends of the grippers 5 are connected to the fixing seat 4. An annular groove 20 is provided on the inner wall of the front end of the fixing seat 4. There are a total of six grippers 5, arranged sequentially in a circle along the circumference of the fixing seat 4. The rear end of each gripper 5 extends into the front end of the fixing seat 4 and has an outwardly protruding arc-shaped protrusion. Along 18, the arc-shaped convex edge 18 is embedded in the annular groove 20 to axially limit the gripper 5. A groove is provided on the outer wall of the arc-shaped convex edge 18. A gathering spring 19 is provided at the rear end of each gripper 5 to hold the arc-shaped convex edge 18 of each gripper 5. The gathering spring 19 is embedded in the groove on the outer wall of the arc-shaped convex edge 18. Simultaneously, the gathering spring 19 is located within the annular groove 20. The gathering spring 19 applies a preload force to the gripper 5, causing the gripper 5 to be in a retracted state under normal conditions. In the retracted state, each gripper 5 is tightly closed together, and the front ends of each gripper 5 combine to form a conical head. The gathering spring 19 can be an elastic rubber ring. The fixing seat 4 is threadedly connected to the sleeve 13.

[0025] The reciprocating rod 17 is installed inside the sleeve 13 and moves within it. The front end of the reciprocating rod 17 corresponding to the gripper assembly is provided with a tapered portion.

[0026] A motor is installed inside the housing 1. The cam assembly is driven to rotate by the motor. The cam assembly includes a cam 6. The cam 6 is rotatably connected to the housing 1 through a first wheel shaft 7. The first wheel shaft 7 is connected to the motor, so that the motor can drive the cam 6 to rotate through the first wheel shaft 7.

[0027] The rear end of the reciprocating rod 17 is connected to a rotatable roller 25. The roller 25 is rotatably connected to the reciprocating rod 17 through the second wheel shaft 8, and the roller 25 contacts the outer edge of the cam 6.

[0028] When the cam 6 is driven to rotate by the motor, the outer edge of the cam 6 pushes the roller 25 to move the reciprocating rod 17 forward. The tapered part at the front end of the reciprocating rod 17 is inserted between each jaw 5, so that each jaw 5 is switched from the closed state to the open state by the action of the tapered part. A certain gap is generated between two adjacent jaws 5 and the gathering spring 19 is deformed by force. When the convex part of the cam 6 rotates away from the rear side of the reciprocating rod 17, the spring pushes the reciprocating rod 17 to move backward and reset. During this process, the roller 25 is always in contact with the cam 6. The tapered part of the reciprocating rod 17 moves backward and releases each jaw 5. The re-deformed gathering spring 19 drives each jaw 5 to reset from the open state to the closed state.

[0029] The housing 1 includes a main housing 2 and an upper cover 3 mounted on top of the main housing 2. The upper cover 3 is fixedly connected to the main housing 2 by screws, and a space is formed between the upper cover 3 and the main housing 2 for accommodating the sleeve 13, the cam assembly and the reciprocating rod 17.

[0030] Figure 5 , Figure 6 , Figures 13-18 As shown, the housing 1 is equipped with a rotary assembly for driving the gripper assembly to rotate. The rotary assembly includes a movable pin 23, a clutch pin 21, a clutch ring 11, and a rotating ring 16. Both the clutch ring 11 and the rotating ring 16 are sleeved on the reciprocating rod 17 and clamped between the reciprocating rod 17 and the sleeve 13. The rotating ring 16 is located between the clutch ring 11 and the gripper assembly. The clutch pin 21 is connected to the clutch ring 11 and can move and rotate together with the clutch ring 11. One side of the rotating ring 16 is connected to the gripper assembly. The claw assembly engages, and the other side of the rotating ring 16 is provided with a part for engaging with the clutch pin 21. The reciprocating rod 17 is provided with a track groove 34, and the movable pin 23 is slidably disposed in the track groove 34. The clutch ring 11 is provided with a linkage hole 27, and the movable pin 23 is linked with the clutch ring 11 through the linkage hole 27. The spring includes a first spring 24 supported between the rear end of the reciprocating rod 17 and the clutch ring 11, and a second spring 12 supported between the clutch ring 11 and the rotating ring 16.

[0031] When the reciprocating rod 17 is pushed forward by the cam assembly, the clutch ring 11 is pushed forward by the first spring 24 until the clutch pin 21 engages with the rotating ring 16. The movable pin 23 moves along the track groove 34 and drives the clutch ring 11 to rotate. The clutch pin 21 drives the gripper assembly to rotate through the rotating ring 16. This allows the clutch pin 23 to move along the track groove 34 to automatically rotate the gripper assembly when the reciprocating rod 17 moves forward and drives the gripper assembly to open and expand the tube. This makes the tube opening evenly expanded. The method of using a pin to engage with the rotating ring 16 to replace the precision-manufactured gear clutch method reduces manufacturing costs, increases structural strength, and reduces maintenance costs.

[0032] A support seat 9 is provided at the rear end of the reciprocating rod 17. The support seat 9 is supported in the sleeve 13 and positions the rear end of the reciprocating rod 17. The clutch ring 11 and the rotating ring 16 are both provided in the sleeve 13 and sandwiched between the reciprocating rod 17 and the sleeve 13. The clutch ring 11 and the rotating ring 16 are supported at the front of the reciprocating rod 17 and position the front end of the reciprocating rod 17 to limit the radial movement of the reciprocating rod 17 relative to the sleeve 13. Guide grooves 10 are provided on both sides of the sleeve 13. The guide grooves 10 are opened along the axial direction of the sleeve 13 and pass through the rear end of the sleeve 13. The two ends of the second wheel shaft 8 are respectively inserted into the guide grooves 10 on both sides. The guide grooves 10 work together to limit the movement of the reciprocating rod 17 to restrict the rotation of the reciprocating rod 17 relative to the sleeve 13, thereby limiting the reciprocating rod 17 to move in a straight line within the sleeve 13.

[0033] The centerlines of the sleeve 13, clutch ring 11, rotating ring 16 and reciprocating rod 17 are on the same straight line.

[0034] The inner wall of the front end of the sleeve 13 is provided with an inwardly protruding inner ring edge 15, and the outer wall of the rotating ring 16 is provided with an outwardly protruding outer ring edge 14. The outer ring edge 14 abuts against the rear side of the inner ring edge 15 to restrict the rotating ring 16 from moving forward away from the sleeve 13.

[0035] The first spring 24 is supported between the support seat 9 and the clutch ring 11, and the second spring 12 is supported between the clutch ring 11 and the outer ring edge 14. The first spring 24 and the second spring 12 are sleeved on the reciprocating rod 17.

[0036] The sleeve 13 is provided with a limiting groove 28. The movable pin 23 passes through the linkage hole 27 and is inserted into the limiting groove 28. When the reciprocating rod 17 is pushed forward by the cam assembly, the clutch ring 11 is pushed forward by the first spring 24. The movable pin 23 is driven by the clutch ring 11 to move to the position where it abuts against the front groove wall of the limiting groove 28. At this time, as the reciprocating rod 17 moves forward, the front groove wall of the limiting groove 28 pushes the movable pin 23 to move along the track groove 34, so that the movable pin 23 drives the clutch ring 11 to rotate.

[0037] The track groove 34 includes a first slide groove 26 opened along the axial direction of the reciprocating rod 17 and a deflection groove 30 located on one side of the front end of the first slide groove 26. The rear wall of the deflection groove 30 is inclined, and the rear wall of the limiting groove 28 is also inclined. The rear wall of the deflection groove 30 is used to guide the movable pin 23 from the deflection groove 30 into the first slide groove 26 when the reciprocating rod 17 moves forward. The rear wall of the limiting groove 28 is used to guide the movable pin 23 from the first slide groove 26 into the deflection groove 30 for resetting when the reciprocating rod 17 moves backward.

[0038] Preferably, the width of the limiting groove 28 in the axial direction of the sleeve 13 gradually narrows from one end to the other. The limiting groove 28 is a triangular groove, and the front wall of the limiting groove 28 is a straight edge. The straight edge of the front wall can better push the movable pin 23 to move along the track groove 34 when the reciprocating rod 17 moves forward.

[0039] The linkage hole 27 is an elongated hole opened along the circumference of the clutch ring 11. The width of the linkage hole 27 is equal to the width of the movable pin 23. When the reciprocating rod 17 moves forward, the linkage hole 27 can drive the movable pin 23 to move forward through the inner wall on the rear side. Preferably, the linkage hole 27 is a U-shaped hole, and the front end of the linkage hole 27 passes through the front end of the clutch ring 11.

[0040] The track groove 34 passes through both sides of the reciprocating rod 17. The clutch ring 11 has linkage holes 27 corresponding to the track groove 34 on both sides. The sleeve 13 has limiting grooves 28 corresponding to the linkage holes 27 on both sides. The movable pin 23 passes through the linkage hole 27 and the track groove 34, and its two ends protrude from the outside of the clutch ring 11. The two ends of the movable pin 23 are respectively inserted into the limiting grooves 28 on both sides.

[0041] The reciprocating rod 17 has a second sliding groove 22 that runs through both sides of its side wall. The second sliding groove 22 is opened along the axial direction of the reciprocating rod 17. The clutch ring 11 has connecting holes 29 on both sides corresponding to the second sliding groove 22. The clutch pin 21 passes through the second sliding groove 22 and the connecting hole 29, and the two ends of the clutch pin 21 protrude from the outer wall surface on both sides of the clutch ring 11 to engage with the rotating ring 16. The second sliding groove 22 has a length for the clutch pin 21 to move inside and a width for the clutch pin 21 to rotate inside.

[0042] The elastic force of the second spring 12 is less than that of the first spring 24. When the reciprocating rod 17 moves forward, it compresses the first spring 24 forward through the support seat 9, causing the clutch ring 11 to be pushed forward by the first spring 24. The clutch ring 11 compresses the second spring 12 forward. Because the elastic force of the second spring 12 is less than that of the first spring 24, the second spring 12 is compressed before the first spring 24 is compressed. During the compression of the second spring 12, the clutch ring 11 is first pushed by the first spring 24 to move with the reciprocating rod 17 to the position where the clutch pin 21 engages with the rotating ring 16. At this time, the first spring 24 begins to be compressed, and the reciprocating rod 17 moves forward relative to the clutch ring 11. This causes the movable pin 23 to move along the track groove 34 and drive the clutch ring 11 to rotate during the relative movement of the reciprocating rod 17 and the clutch ring 11. This achieves the process of the clutch pin 21 engaging with the rotating ring 16 first, and then being driven to rotate by the movable pin 23.

[0043] Figures 5-12As shown, the working principle is as follows: In the initial state, the movable pin 23 is located in the deflection groove 30, at the rear end of the linkage hole 27, and at the rear side of the widest end of the limiting groove 28. When the motor is started, it drives the cam 6 to rotate. When the position of the cam 6 in contact with the roller 25 rotates from the concave to the convex position, the cam 6 pushes the reciprocating rod 17 forward through the roller 25, opening the gripper assembly. During the forward movement of the reciprocating rod 17, the rear end of the reciprocating rod 17 compresses the first spring 24 forward. The elastic force of the first spring 24 acts on the... On the clutch ring 11, pushing the clutch ring 11 forward causes the clutch ring 11 to compress the second spring 12 forward. Since the elastic force of the second spring 12 is less than that of the first spring 24, the second spring 12 is compressed before the first spring 24, allowing the clutch ring 11 to move forward with the reciprocating rod 17. During the forward movement of the clutch ring 11, the clutch ring 11 drives the clutch pin 21 to move forward synchronously, causing the clutch pin 21 to move towards the rotating ring 16. Furthermore, the clutch ring 11 pushes the movable pin 23 forward through the inner wall of the rear end of the linkage hole 27, causing the movable pin 23 to move from the limit groove 28. The clutch pin 21 moves forward from the rear position of the end with the greatest width until it engages with the rotating ring 16. The clutch ring 11 stops moving forward. At this time, the movable pin 23 also moves to the position where it abuts against the front wall of the limiting groove 28 at the widest end. The reciprocating rod 17 continues to move forward, and the movable pin 23 is pushed by the front wall of the limiting groove 28 to contact the rear wall of the deflection groove 30. It then slides along the rear wall of the deflection groove 30 into the first slide groove 26 and slides relative to the first slide groove 26. At this time, the movable pin 23 moves from the width of the limiting groove 28... As the largest end moves to the smallest end, the movable pin 23 slides from the deflection groove 30 into the first slide groove 26. During this process, the movable pin 23 rotates at an angle around the axis of the reciprocating rod 17. The movable pin 23 can push the inner wall of the linkage hole 27 to make the clutch ring 11 rotate. The clutch ring 11 drives the clutch pin 21 to rotate. Since the clutch pin 21 is engaged with the rotating ring 16 at this time, and the rotating ring 16 is engaged with the gripper assembly, the clutch pin 21 can drive the rotating ring 16 and the gripper assembly to rotate, so as to automatically rotate during the opening of the gripper assembly to expand the pipe and tubing.When the contact position between cam 6 and roller 25 rotates from the convex part to the concave part, the restoring force of the second spring 12 acts on the clutch ring 11, pushing the clutch ring 11 to move backward and reset. The clutch ring 11 presses the first spring 24 backward, and at the same time, the restoring force of the first spring 24 acts on the reciprocating rod 17, pushing the reciprocating rod 17 to move backward and reset, so that the reciprocating rod 17 can gradually move backward with the rotation of cam 6. The clutch pin 21 will disengage from the rotating ring 16 as the clutch ring 11 moves backward. During the backward movement of the reciprocating rod 17, the movable pin 23 slides relative to the first slide groove 26 to the front position of the first slide groove 26 and abuts against the front side wall of the first slide groove 26. At this time, the reciprocating rod 17 continues to move backward, and the front of the first slide groove 26... The side groove wall can push the movable pin 23 to slide along the rear side groove wall of the limiting groove 28. The rear side groove wall of the limiting groove 28 guides the movable pin 23 from the front position of the first sliding groove 26 into the deflection groove 30. At this time, the movable pin 23 moves from the end with the smallest width of the limiting groove 28 along the rear side groove wall of the limiting groove 28 to the rear position of the end with the largest width, and the movable pin 23 is finally located at the rear position of the linkage hole 27. During the process of the movable pin 23 sliding from the first sliding groove 26 into the deflection groove 30, the movable pin 23 rotates around the axis of the reciprocating rod 17 to return to the original initial angle. The movable pin 23 can push the inner wall of the linkage hole 27 to make the clutch ring 11 rotate, and the clutch ring 11 drives the clutch pin 21 to rotate.

[0044] Assuming that the movable pin 23 slides from the deflection groove 30 to the first slide groove 26, during this process the movable pin 23 rotates 22.5° around the axis of the reciprocating rod 17, then the clutch ring 11 drives the clutch pin 21 to rotate 22.5°.

[0045] The movable pin 23 is set perpendicularly to the clutch pin 21.

[0046] Figure 15 As shown, the rotating ring 16 has multiple slots 31 on the side near the clutch ring 11. These slots 31 are evenly distributed circumferentially and serve as engagement points on the rotating ring 16 for engaging with the clutch pin 21, allowing the protruding ends of the clutch pin 21 to be engaged into the slots 31 on both sides. Preferably, the slots 31 are V-shaped, facilitating the entry of the movable pin 23 into the slots 31.

[0047] Figure 17 As shown, the rear of the gripper assembly is provided with multiple first protrusions 33, and the front side of the rotating ring 16 is provided with multiple second protrusions 32. The first protrusions 33 and the second protrusions 32 engage with each other, so that the rotating ring 16 can drive the gripper assembly to rotate.

[0048] The above describes the handheld portable pipe extension tool provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments are only for the purpose of helping to understand this utility model and its core ideas. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A handheld portable pipe extension tool, comprising a housing and a gripper assembly, the gripper assembly being retractable or expandable; a reciprocating rod limited to moving along a straight line is provided within the housing; a cam assembly for pushing the reciprocating rod forward is provided within the housing and located behind the reciprocating rod; a spring for driving the reciprocating rod backward to reset is provided within the housing; the front end of the reciprocating rod is correspondingly positioned with the gripper assembly; the forward movement of the reciprocating rod opens the gripper assembly; the backward movement of the reciprocating rod releases the gripper assembly, allowing the gripper assembly to retract. The tool is characterized in that... The housing contains a rotary assembly for driving the gripper assembly to rotate. The rotary assembly includes a movable pin, a clutch pin, a clutch ring, and a rotating ring. Both the clutch ring and the rotating ring are fitted onto the reciprocating rod. The rotating ring is located between the clutch ring and the gripper assembly. The clutch pin is connected to the clutch ring and can move and rotate with the clutch ring. One side of the rotating ring engages with the gripper assembly, and the other side of the rotating ring has a part for engaging with the clutch pin. The reciprocating rod is provided with a track groove, and the movable pin is slidably disposed in the track groove. The clutch ring is provided with a linkage hole, and the movable pin engages with the clutch ring through the linkage hole. The spring includes a first spring supported between the rear end of the reciprocating rod and the clutch ring, and a second spring supported between the clutch ring and the rotating ring. When the reciprocating rod is pushed forward by the cam assembly, the clutch ring is pushed forward by the first spring until the clutch pin engages with the rotating ring. The movable pin moves along the track groove and drives the clutch ring to rotate. The clutch pin drives the gripper assembly to rotate through the rotating ring.

2. The hand-held portable pipe expansion tool of claim 1, wherein, The rotating ring has multiple slots on the side near the clutch ring. These slots are evenly arranged circumferentially and serve as the parts on the rotating ring for engaging with the clutch pin.

3. The handheld portable pipe extension tool according to claim 1, characterized in that, The elastic force of the second spring is less than that of the first spring.

4. The handheld portable pipe extension tool according to claim 1, characterized in that, A sleeve is fixed inside the housing. The reciprocating rod moves inside the sleeve. The clutch ring is clamped between the reciprocating rod and the sleeve. The sleeve has a limiting groove. The movable pin passes through the linkage hole and is inserted into the limiting groove. When the reciprocating rod is pushed forward by the cam assembly, the clutch ring is pushed forward by the first spring and drives the movable pin to move to the position where it abuts against the front wall of the limiting groove. As the reciprocating rod moves forward, the front wall of the limiting groove pushes the movable pin to move along the track groove, so that the movable pin drives the clutch ring to rotate.

5. The handheld portable pipe extension tool according to claim 4, characterized in that, The track groove includes a first slide groove opened along the axial direction of the reciprocating rod and a deflection groove located on one side of the front end of the first slide groove. The rear wall of the deflection groove is inclined, and the rear wall of the limiting groove is also inclined. The rear wall of the deflection groove is used to guide the movable pin from the deflection groove to the first slide groove when the reciprocating rod moves forward, and the rear wall of the limiting groove is used to guide the movable pin from the first slide groove to the deflection groove for resetting when the reciprocating rod moves backward.

6. The handheld portable pipe extension tool according to claim 5, characterized in that, The width of the limiting groove in the axial direction of the sleeve gradually narrows from one end to the other. The limiting groove is a triangular groove, and the front wall of the limiting groove is a straight edge.

7. The hand-held portable pipe expansion tool according to claim 1 or 4, wherein The linkage hole is an elongated hole opened along the axial direction of the clutch ring. The width of the linkage hole is equal to the width of the movable pin. When the reciprocating rod moves forward, the linkage hole can drive the movable pin to move forward through the inner wall on the rear side.

8. The hand-held portable pipe expansion tool according to claim 1 or 4, wherein The reciprocating rod has a second sliding groove on its side wall that runs through both sides. The second sliding groove is opened along the axial direction of the reciprocating rod. The clutch ring has connecting holes on both sides corresponding to the second sliding groove. The clutch pin passes through the second sliding groove and the connecting holes, and the two ends of the clutch pin protrude from the outer wall surface on both sides of the clutch ring for engaging with the rotating ring. The second sliding groove has a length for the clutch pin to move inside and a width for the clutch pin to rotate inside.

9. The hand-held portable pipe expansion tool of claim 1 wherein, The rear of the gripper assembly is provided with multiple first protrusions, and the front side of the rotating ring is provided with multiple second protrusions. The first protrusions and the second protrusions engage, so that the rotating ring can drive the gripper assembly to rotate.

10. The hand-held portable pipe expansion tool of claim 2 wherein, The slot is a V-shaped slot.

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