Handheld portable pipe reamer

Abstract

The utility model discloses a handheld portable pipe reamer which comprises a shell with a holding part, a motor, a transmission assembly and a supporting rod limited to move on a straight line are arranged in the shell, the transmission assembly converts rotation power input by the motor into linear movement of the supporting rod, an expansion head opposite to the other end of the supporting rod is arranged on the shell, and the expansion head is connected with the supporting rod. At least part of the expanding head is exposed out of the shell and used for sleeving a pipe to be reamed, the expanding head is defined by a plurality of reaming claws, and when the eccentric gear rotates and pushes the driven gear and the supporting rod to synchronously move towards one side of the expanding head, one end of the supporting rod is inserted into the expanding head so that the reaming claws which form a circle in a surrounding mode can be opened to be in the expanding state for reaming; the shell is provided with a second elastic piece for providing reset force for the multiple reaming claws to reset to the involution initial state. The reamer is used in a handheld mode, the size is small, operation is convenient and fast, and pipe fittings in a wall or a ceiling or a narrow space can be flared.

Description

Technical Field

[0001] The utility model relates to a hole expander, in particular to a handheld portable pipe hole expander. Background Art

[0002] As the cost of copper pipes increases, relatively low-cost polymer pipes are becoming more common in residential and commercial structures. One of the more common types of polymer pipes is made of cross-linked polyethylene, commonly known as PEX pipe. Polymer pipes are connected to joints by expanding the mouth of the pipe fitting over the fitting, and then the pipe fitting is fixed to the fitting by crimping the expansion of the fitting.

[0003] For example, the tube expander disclosed in Chinese utility model patent CN202656470U includes a shell, in which a support nozzle mechanism is arranged, including an outer shell, in which two or more positioning sliders are arranged, one end of the positioning slider is provided with an extension portion perpendicular to the surface of the positioning slider, after the positioning sliders are matched, the extension portion is cylindrical, the outer diameter of the cylinder matches the inner diameter of the heat shrinkable sleeve, the bottom surface of the positioning slider is provided with a groove, and the groove forms a conical support hole after the positioning sliders are matched, and an elastic device is also provided in the shell to control the two or more The positioning slider is in a matched state; the support head is cylindrical with a conical end, the tip of the cone faces the conical support hole, and the taper of the piece end matches the support hole; the driving device drives the support head to move back and forth, and the support head drives the positioning slider to move axially and circumferentially along the support mechanism. The structure drives the support head upward through the driving device. When the support head rises into the support hole, the conical surface contacts to generate a circumferential force radiating outward from the axis of the support head, causing the positioning slider to move outward, the extension part is released, and the heat shrinkable sleeve sleeved thereon is evenly expanded.

[0004] There are many joints in the existing residential or commercial building structures. The installation of pipe fittings involves expanding the pipe openings of many pipes. Many pipe fittings to be expanded are assembled on walls or ceilings. The pipe openings of the pipe fittings are oriented in different directions, and the pipe fittings are also in narrow or compact spaces. However, the existing pipe expansion equipment is generally a larger machine equipment. This type of pipe expansion equipment is placed in a fixed position for pipe expansion and cannot expand the pipe openings of walls, ceilings or narrow spaces. Utility Model Content

[0005] Based on the problem that the above-mentioned pipe expanding equipment is generally a relatively large machine equipment, and this type of pipe expanding equipment is placed in a fixed position for pipe expanding, and cannot expand pipe fittings in walls, ceilings or narrow spaces, the utility model provides a handheld portable pipe reamer.

[0006] The technical solution adopted by the utility model to solve the above technical problems is: a handheld portable pipe reamer, characterized in that it includes a shell with a gripping portion, a motor, a transmission assembly and a strut restricted to move in a straight line are arranged in the shell, the transmission assembly converts the rotational power input by the motor into the linear movement of the strut, the transmission assembly includes an eccentric gear and a driven gear, the eccentric gear is connected to the motor, the rotation center of the eccentric gear is parallel to the axis of the eccentric gear and does not overlap, the driven gear is installed on one end of the strut and moves synchronously with the strut, a first elastic member is arranged between the strut and the shell, and the first elastic member The elastic force drives the support rod to move toward one side of the eccentric gear, so that the driven gear always rests on the outer periphery of the eccentric gear and meshes with the eccentric gear. An expansion head opposite to the other end of the support rod is installed on the outer shell, and the expansion head is at least partially exposed outside the outer shell for fitting the pipe to be expanded. The expansion head is surrounded by a plurality of expansion claws. When the eccentric gear rotates and pushes the driven gear and the support rod to move synchronously toward one side of the expansion head, one end of the support rod is inserted into the expansion head to expand the plurality of expansion claws in a circle to an expanded state for expanding the hole. A second elastic member is provided on the outer shell to provide a reset force for the plurality of expansion claws to return to the initial state of engagement.

[0007] A further preferred technical solution of the utility model is: the shell includes a holding part and a main body connected to the top of the holding part, the motor is installed in the holding part, the eccentric gear, the driven gear, and the support rod are installed in the main body, and the expansion head is arranged at the front end of the main body.

[0008] A further preferred technical solution of the present invention is that the gripping portion and the main body are combined into an inverted L-shape.

[0009] A further preferred technical solution of the utility model is as follows: the support rod is an axial structure, and a center hole is provided in the center of the support rod along its axial extension. The center hole has an orifice at one end close to the eccentric gear and is closed at the other end. A guide seat is movably provided in the center hole, and a pressure regulating part is threadedly connected at the orifice of the center hole. A pressure spring is provided between the guide seat and the pressure regulating part, and between the guide seat and the inner bottom of the center hole to position the guide seat in the center hole. A guide pin is fixed on the guide seat, and a first guide groove for the guide pin to extend out is provided on the side wall of the support rod. The first guide groove includes a straight section extending along the length direction of the support rod and an inclined section arranged at one end of the straight section. A ring is installed in the outer shell and is sleeved on the outer side of the support rod. The ring rotates relative to the outer shell. The ring is located on the inner side of the expansion head, and the ring and the expansion head are engaged with each other through a clamping tooth and a tooth groove. A bayonet for the guide pin to enter is provided on the side of the ring away from the expansion head. When the support rod moves toward the side of the expansion head to open a plurality of reaming claws, the guide pin moves into the bayonet and drives the ring and the expansion head to rotate along the inclined section.

[0010] A further preferred technical solution of the utility model is: the transmission assembly also includes a planetary gear reducer, the input end of the planetary gear reducer is connected to the motor shaft of the motor, and the output end of the planetary gear reducer is connected to the eccentric gear.

[0011] A further preferred technical solution of the utility model is: the main body includes a main shell, a sleeve and a front ring, the bottom of the main shell is provided with a plug-in portion extending downward, the plug-in portion is inserted into the holding portion and connected with the holding portion, the planetary gear reducer is installed in the plug-in portion, the sleeve is installed in the main shell, and the front end is exposed from the main shell, the front ring is connected to the exposed front end of the sleeve, the support rod is arranged in the sleeve, the end of the support rod opposite to the eccentric gear is provided with a pin shaft, the driven gear is arranged on the pin shaft, the two ends of the pin shaft protrude from both sides of the support rod, the sleeve is provided with two second guide grooves corresponding to the two ends of the pin shaft respectively, the two ends of the pin shaft are respectively inserted in the two second guide grooves and move along the second guide grooves to limit the support rod to move in a straight line.

[0012] A further preferred technical solution of the utility model is: the expansion head is connected to the front ring, and an annular groove is provided on the inner wall of the front ring. The outer sides of several reaming claws are provided with convex edges. When several reaming claws are matched, the convex edges are combined to form an outer ring edge that is engaged with the annular groove. A space is provided between the reaming claws and the inner wall of the front ring for the reaming claws to move outward and expand. The second elastic member includes an elastic rubber ring, which is sleeved on the outer sides of the convex edges of several reaming claws, and the convex edges are provided with grooves for the elastic rubber rings to be engaged.

[0013] A further preferred technical solution of the utility model is that the axis of the motor is perpendicular to the moving direction of the support rod.

[0014] A further preferred technical solution of the utility model is that the end of the support rod opposite to the expansion head is conical, and the inner surface of the reaming claw is provided with a groove, and the groove forms a conical support hole for the support rod to be inserted after a plurality of reaming claws are matched.

[0015] A further preferred technical solution of the present invention is: a battery pack mounting portion is provided at the bottom of the gripping portion for sliding insertion of the battery pack.

[0016] Compared with the prior art, the advantage of the utility model is that it includes a shell of the reamer with a holding portion, a motor, a transmission assembly and a strut rod limited to move in a straight line are arranged in the shell, the transmission assembly converts the rotational power input by the motor into linear movement of the strut rod, and an expansion head opposite to one end of the strut rod is mounted on the shell, the expansion head at least partially falls on the outside of the shell and is used to fit the pipe to be expanded, the expansion head is surrounded by a plurality of reaming claws, when the eccentric gear rotates and pushes the driven gear and the strut rod to move synchronously to one side of the expansion head, one end of the strut rod is inserted into the expansion head to expand the plurality of reaming claws in a circle to an expanded state for reaming, a second elastic member is provided on the shell to provide a reset force for the plurality of reaming claws to return to an initial state of engagement, the reamer is used by hand, has a small size, is easy to operate, and can reame pipes in walls, ceilings or narrow spaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematically representing the composition or structure of the described object and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0018] Figure 1 The overall structure of the utility model is shown in FIG. Figure 1 ;

[0019] Figure 2 The overall structure of the utility model is shown in FIG. Figure 2 ;

[0020] Figure 3 It is a cutaway schematic diagram of the utility model;

[0021] Figure 4 This is a disassembled diagram of the main body and the grip part;

[0022] Figure 5 Schematic diagram of the internal structure of the grip part;

[0023] Figure 6 Schematic diagram of the internal structure of the main body;

[0024] Figure 7 is a schematic diagram of the structure of the casing;

[0025] Figure 8 It is a schematic diagram of the structure of the support rod, the collar and the expansion head;

[0026] Fig. 9 is a schematic diagram of the overall structure of the support rod;

[0027] Fig.10For the split of the collar and the expansion head Figure 1 ;

[0028] Fig.11 For the split of the collar and the expansion head Figure 2 .

[0029] In the figure: 1. Shell; 2. Main body; 3. Extension head; 4. Grip; 5. Switch; 6. Battery pack installation; 7. Support hole; 8. Support rod; 9. Convex edge; 10. First annular groove; 11. Elastic rubber ring; 12. Groove; 13. Front ring; 14. Pressure spring; 15. Ring; 16. Second outer ring edge; 17. Second inner ring edge; 18. Annular ring; 19. Second annular groove; 20. Third annular groove; 21. Guide seat; 22. Sleeve; 23. First inner ring edge; 24. Annular groove; 25. First return spring; 26. Motor; 27. Center hole; 28. Pressure spring Adjusting part; 29, driven gear; 30, main housing; 31, transmission shaft; 32, eccentric gear; 33, plug-in part; 34, planetary gear reducer; 35, socket; 36, right half shell; 37, left half shell; 38, upper half shell; 39, lower half shell; 40, pin shaft; 41, second guide groove; 42, shaft seat; 43, first guide groove; 44, guide pin; 45, straight section; 46, inclined section; 47, shaping part; 48, tapered part; 49, reaming claw; 50, tooth groove; 51, limiting boss; 52, bayonet; 53, latch tooth; 54, axis of support rod; 55, axis of motor. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It will be appreciated by those skilled in the art that these descriptions are merely illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0031] It should be noted that like reference numerals denote similar items in the following drawings, and thus, once an item is defined in one drawing, it may not be further defined or explained in subsequent drawings.

[0032] Figure 1-Figure 11 As shown, a handheld portable pipe reamer comprises a housing 1 having a grip portion 4, wherein a motor 26, a transmission assembly and a strut 8 restricted to move in a straight line are arranged in the housing 1, wherein the transmission assembly converts the rotational power input by the motor 26 into a linear movement of the strut 8, and an expansion head 3 opposite to the other end of the strut 8 is mounted on the housing 1, wherein the expansion head 3 is at least partially exposed outside the housing 1 for fitting onto the pipe to be reamed, and the expansion head 3 is surrounded by a plurality of reaming claws 49.

[0033] Figure 4As shown, preferably, the housing 1 includes a grip portion 4 and a main body 2 connected to the top of the grip portion 4 .

[0034] Preferably, the holding portion 4 includes a left half shell 37 and a right half shell 36. The left half shell 37 and the right half shell 36 are fixed together by screws after being matched. The holding portion 4 is used for the user to hold it in hand when using it.

[0035] Preferably, a switch 5 is provided on the holding portion 4.

[0036] Preferably, a battery pack mounting portion 6 is provided at the bottom of the holding portion 4 for sliding insertion of the battery pack, and the battery pack mounting portion 6 is the same as the slot for mounting a lithium battery pack on an existing power tool. The battery pack is installed at the bottom of the holding portion 4 to power the reamer.

[0037] Figure 3 , Figure 6 As shown, the transmission assembly includes an eccentric gear 32 and a driven gear 29. The eccentric gear 32 is connected to the motor 26. The rotation center of the eccentric gear 32 is parallel to the axis of the eccentric gear 32 and does not overlap, so that the outer periphery of the eccentric gear 32 has different distances from the rotation center. The driven gear 29 is installed on one end of the support rod 8 and moves synchronously with the support rod 8. A first elastic member is provided between the support rod 8 and the housing 1. The elastic force of the first elastic member acts on the support rod 8 to drive the support rod 8 to move toward one side of the eccentric gear 32, so that the driven gear 29 always abuts against the outer periphery of the eccentric gear 32 and the eccentric gear The eccentric gear 32 is meshed with the driven gear 29. As the eccentric gear 32 rotates around its rotation center, when the distance from the contact and meshing portion of the eccentric gear 32 and the driven gear 29 to the rotation center of the eccentric gear 32 becomes larger, the eccentric gear 32 pushes the driven gear 29 and the support rod 8 to move linearly toward the side of the expansion head 3. When the distance from the contact and meshing portion of the eccentric gear 32 and the driven gear 29 to the rotation center of the eccentric gear 32 becomes smaller, the elastic force of the first elastic member pushes the support rod 8 and the driven gear 29 to move linearly toward the side of the eccentric gear 32, so that the driven gear 29 is always meshed with the eccentric gear 32.

[0038] The eccentric gear 32 may be directly connected to the motor shaft of the motor 26 , or the eccentric gear 32 and the motor 26 may be transmitted via a transmission member.

[0039] Preferably, the transmission assembly further includes a planetary gear reducer 34, the input end of the planetary gear reducer 34 is connected to the motor shaft of the motor 26, and the output end of the planetary gear reducer 34 is connected to the eccentric gear 32. The planetary gear reducer 34 is an existing conventional reduction structure.

[0040] Preferably, the output end of the planetary gear reducer 34 is connected to the transmission shaft 31, the eccentric gear 32 is sleeved on the transmission shaft 31 and fixed to the transmission shaft 31, and bearings are provided between both ends of the transmission shaft 31 and the outer shell 1 for supporting and positioning the transmission shaft 31. When the motor 26 is started, the transmission shaft 31 drives the eccentric gear 32 to rotate around the axis of the transmission shaft 31.

[0041] Figure 4 As shown, preferably, the main body 2 includes a main shell 30, a sleeve 22 and a front ring 13. The bottom of the main shell 30 is provided with a plug-in portion 33 extending downward, and the top of the holding portion 4 is provided with a socket 35. The plug-in portion 33 is inserted into the holding portion 4 from the socket 35 and is fixedly connected to the holding portion 4. The sleeve 22 is installed in the main shell 30 and is relatively fixed to the main shell 30, and the front end of the sleeve 22 extends from the opening at the front end of the main shell 30, and the front ring 13 is connected to the front end of the sleeve 22.

[0042] Preferably, the plug-in portion 33 is integrally formed with the main housing 30 , and the main housing 30 includes an upper half shell 38 and a lower half shell 39 , which are fixed by screws after being matched.

[0043] Preferably, a accommodating cavity for accommodating the sleeve 22 is provided in the main shell 30, and the shape of the accommodating cavity is adapted to the shape of the sleeve 22. The sleeve 22 is a straight cylindrical structure, and an annular groove 24 is provided on the outer wall of the sleeve 22. A first inner ring edge 23 that is snap-fitted with the annular groove 24 is provided on the inner wall of the accommodating cavity. The first inner ring edge 23 is snap-fitted in the annular groove 24 to limit the movement of the sleeve 22 relative to the main shell 30.

[0044] Preferably, the front ferrule 13 is threadedly connected to the front end of the sleeve 22 .

[0045] Figure 7-Figure 9 As shown, preferably, the support rod 8 is inserted in the sleeve 22 for movement, and a pin 40 is provided at one end of the support rod 8 opposite to the eccentric gear 32, and the driven gear 29 is sleeved on the pin 40 and fixed relative to the pin 40. Two shaft seats 42 are provided at one end of the support rod 8 opposite to the eccentric gear 32, and there is a space between the two shaft seats 42 for accommodating the driven gear 29, and the two ends of the pin 40 are rotatably inserted in the shaft seats 42 on both sides.

[0046] The two ends of the pin 40 protrude from the shaft seats 42 on both sides, and the sleeve 22 is provided with two second guide grooves 41 corresponding to the two ends of the pin 40. The two ends of the pin 40 are respectively inserted into the two second guide grooves 41 and move along the second guide grooves 41, thereby limiting the support rod 8 to move in a straight line. Preferably, the two ends of the pin 40 slide against the inner walls of the two sides of the accommodating cavity.

[0047] When it is necessary to expand the pipe mouth, the expansion head 3 is inserted into the pipe to be expanded, and the motor 26 is started. At this time, the eccentric gear 32 rotates and pushes the driven gear 29 and the support rod 8 to move synchronously to one side of the expansion head 3. One end of the support rod 8 is inserted into the expansion head 3 to expand a number of expansion claws 49 in a circle to an expanded state. The expansion claws 49 in the expanded state expand the pipe mouth of the pipe sleeved on the outside to complete the expansion of the pipe. A second elastic member is provided on the outer shell 1 to provide a reset force for the expansion claws 49 to return to the initial state of engagement. The reamer is used by hand, has a small size, and is easy to operate. It can expand pipe fittings in walls, ceilings or narrow spaces.

[0048] The expansion head 3 is arranged at the front end of the main body 2. Preferably, the expansion head 3 is connected to the front ring 13. The inner wall of the front ring 13 is provided with a first annular groove 10. The outer sides of the plurality of reaming claws 49 are provided with convex edges 9. When the plurality of reaming claws 49 are matched, the convex edges 9 are combined to form a first outer ring edge that is snap-fitted with the first annular groove 10. A space is provided between the reaming claws 49 and the front ring 13 for the reaming claws 49 to move outward and expand. The second elastic member includes an elastic rubber ring 11. The elastic rubber ring 11 is sleeved on the outer sides of the convex edges 9 of the plurality of reaming claws 49. The convex edges 9 are provided with grooves 12 for the elastic rubber rings 11 to be snapped into.

[0049] In addition, the support rod 8 is an axial structure, and a center hole 27 is provided in the center of the support rod 8 along its axial extension. The end of the center hole 27 close to the shaft seat 42 has an orifice, and the orifice is located on the end face of the support rod 8. The other end of the center hole 27 is closed. A guide seat 21 is movably provided in the center hole 27. A pressure regulating part 28 is threadedly connected at the orifice of the center hole 27. Pressure springs 14 are provided between the guide seat 21 and the pressure regulating part 28, and between the guide seat 21 and the inner bottom of the center hole 27. The pressure springs 14 on both sides act on the middle guide seat 21 to position the guide seat 21 in the center hole 27. A guide pin 44 is fixed on the guide seat 21. A first guide groove 43 is provided for the guide pin 44 to extend out, and the first guide groove 43 includes a straight section 45 extending along the length direction of the strut 8 and an inclined section 46 arranged at one end of the straight section 45. A collar 15 is installed in the housing 1 and is sleeved on the outside of the strut 8. The collar 15 rotates relative to the housing 1. The collar 15 is located inside the expansion head 3 and abuts against the expansion head 3. The collar 15 and the expansion head 3 are engaged with each other through the engaging teeth 53 and the tooth groove 50, so that the collar 15 and the expansion head 3 are relatively rotated. A bayonet 52 for the guide pin 44 to enter is provided on the side of the collar 15 away from the expansion head 3. The inclined section 46 is located at one end of the straight section 45 close to the collar 15. The inclined section 46 is inclined along the outer circumference of the strut 8.

[0050] The strut 8 moves linearly along the axis 54 of the strut.

[0051] Preferably, the collar 15 is located in the sleeve 22, and a second inner ring edge 17 is provided on the inner wall of the pipe mouth of the sleeve 22, and a second outer ring edge 16 is provided on the outer wall of the collar 15. The shape of the second outer ring edge 16 is adapted to the internal shape of the sleeve 22, and the second outer ring edge 16 abuts against the inner side of the second inner ring edge 17, and a second annular groove 19 is provided on the inner periphery of the second inner ring edge 17. A third annular groove 20 is provided on the outer wall of the collar 15, and an annular retaining ring 18 is clamped in the third annular groove 20. A part of the annular retaining ring 18 is clamped in the second annular groove 19 to limit the movement of the collar 15 relative to the sleeve 22, and the collar 15 can rotate relative to the sleeve 22.

[0052] Fig.10 , Fig.11 As shown, preferably, a plurality of latch teeth 53 are provided on the end face of the collar 15 opposite to the expansion head 3, and tooth grooves 50 on the expansion head 3 correspond to each latch tooth 53. The latch teeth 53 are inserted into the corresponding tooth grooves 50 for snap-fitting, so that the collar 15 can drive the expansion head 3 to rotate synchronously when it rotates.

[0053] Preferably, a circle of limiting protrusions 51 is provided on the end surface of the collar 15 opposite to the guide pin 44 , and a slot 52 for the guide pin 44 to enter is formed between two adjacent limiting protrusions 51 .

[0054] When the support rod 8 is in the initial position, the guide pin 44 is located at one end of the inclined section 46 close to the collar 15. When the pipe opening of the pipe material is expanded, the eccentric gear 32 rotates to push the driven gear 29 and the support rod 8 to move synchronously to the side of the expansion head 3, so that one end of the support rod 8 is inserted into the expansion head 3 to expand a number of expansion claws 49 for expansion. In this process, the guide pin 44 moves with the support rod 8 until the guide pin 44 enters the bayonet 52 between the two limiting protrusions 51. Then, the guide pin 44 is blocked by the collar 15 and moves relative to the support rod 8, so that the guide pin 44 drives the collar 15 and the expansion head 3 to rotate synchronously along the inclined section 46, so that the expansion head 3 is expanded and rotated at the same time, and the pipe is expanded uniformly. When the first elastic member pushes the support rod 8 and the driven gear 29 to move back during the rotation of the eccentric gear 32, the guide pin 44 moves back to one end of the inclined section 46 close to the collar 15, and the guide pin 44 drives the collar 15 and the expansion head 3 to rotate in the opposite direction along the inclined section 46.

[0055] Preferably, the first elastic member is a first return spring 25 , which is sleeved on the outside of the support rod 8 , with one end of the first return spring 25 pressing against the collar 15 , and the other end of the first return spring 25 pressing against the shaft seat 42 .

[0056] Preferably, the collar 15 is sleeved on one end of the strut 8 to support the strut 8, and the shaft seats 42 on both sides of the other end of the strut 8 are pressed against the inner wall of the sleeve 22 to support the other end of the strut 8 to limit the displacement of the strut 8 when moving in the sleeve 22.

[0057] The position of the pressure regulating part 28 in the center hole 27 can be adjusted by rotating the pressure regulating part 28, thereby adjusting the position of the guide seat 21 in the center hole 27. The pressure regulating part 28 has an adjustment hole at its center for inserting a tool for rotation.

[0058] Preferably, the end of the support rod 8 opposite to the expansion head 3 is conical, and the inner surface of the reaming claw 49 is provided with a groove, and the groove forms a conical support hole 7 for the support rod 8 to be inserted after a plurality of reaming claws 49 are matched.

[0059] Preferably, the reaming claw 49 includes a conical portion 48 and a shaping portion 47. When a plurality of reaming claws 49 are aligned, the conical portions 48 are combined to form a cone, and the shaping portions 47 are combined to form a cylinder. When the pipe is braced 7, the conical portion 48 at the front end of the reaming claw 49 is inserted into the pipe mouth of the pipe, the motor 26 is started, the eccentric gear 32 rotates to push the driven gear 29 and the strut 8 to move toward the expansion head 3, and the strut 8 is inserted into the expansion head 3, generating a circumferential force that diverges outward from the axis of the strut 8, so that the reaming claw 49 moves outward to expand, so that the shaping portion 47 can be inserted into the pipe mouth, and the shaping portions 47 are separated to uniformly expand the pipe mouth of the pipe sleeved thereon.

[0060] Preferably, the motor 26 is installed in the grip 4, the eccentric gear 32, the driven gear 29, and the support rod 8 are installed in the main body 2, and the plug-in portion 33 is a sleeve-shaped structure, and the planetary gear reducer 34 is installed in the plug-in portion 33. This structure balances the weight between the grip 4 and the main body 2, making it more comfortable to hold and reducing fatigue in use.

[0061] Preferably, the grip portion 4 and the main body 2 are combined into an inverted L shape.

[0062] Preferably, the axis line 55 of the motor is perpendicular to the moving direction of the support rod 8 .

[0063] A control circuit board and other electronic devices are also arranged in the housing 1 .

[0064] The above is an introduction to the handheld portable pipe reamer provided by the utility model. This article uses specific examples to illustrate the principle and implementation of the utility model. The description of the above embodiments is only used to help understand the utility model and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A portable handheld pipe reamer, characterized in that: The invention comprises a shell with a holding portion, wherein a motor, a transmission assembly and a support rod limited to move in a straight line are arranged in the shell, wherein the transmission assembly converts the rotational power input by the motor into the linear movement of the support rod, and the transmission assembly comprises an eccentric gear and a driven gear, wherein the eccentric gear is connected to the motor, and the rotation center of the eccentric gear is parallel to and does not overlap with the axis of the eccentric gear, and the driven gear is mounted on one end of the support rod and moves synchronously with the support rod, and a first elastic member is arranged between the support rod and the shell, and the elastic force of the first elastic member drives the support rod to move toward one side of the eccentric gear, so that the driven gear is driven by the eccentric gear. The moving gear always rests against the outer periphery of the eccentric gear and meshes with the eccentric gear. An expansion head is installed on the outer shell opposite to the other end of the support rod. The expansion head is at least partially exposed outside the outer shell and is used to fit the pipe to be expanded. The expansion head is surrounded by a plurality of expansion 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 plurality of expansion claws in a circle to an expanded state for expanding the hole. A second elastic member is provided on the outer shell to provide a reset force for the plurality of expansion claws to return to the initial state of engagement.

2. The handheld portable pipe reamer according to claim 1, characterized in that: The shell comprises a holding part and a main body connected to the top of the holding part, the motor is installed in the holding part, the eccentric gear, the driven gear and the support rod are installed in the main body, and the expansion head is arranged at the front end of the main body.

3. The handheld portable pipe reamer according to claim 2, characterized in that: The gripping portion and the main body are combined into an inverted L shape.

4. The handheld portable pipe reamer according to claim 1, characterized in that: The support rod is an axial structure, and the center of the support rod is provided with a center hole along its axial extension. The center hole has an orifice at one end near the eccentric gear and is closed at the other end. A guide seat is movably provided in the center hole, and a pressure regulating part is threadedly connected at the orifice of the center hole. A pressure spring is provided between the guide seat and the pressure regulating part, and between the guide seat and the inner bottom of the center hole to position the position of the guide seat in the center hole. A guide pin is fixed on the guide seat, and a first guide groove for the guide pin to extend out is provided on the side wall of the support rod. The first guide groove includes a straight section extending along the length direction of the support rod and an inclined section arranged at one end of the straight section. A ring is installed in the outer shell and is sleeved on the outer side of the support rod. The ring rotates relative to the outer shell. The ring is located on the inner side of the expansion head, and the ring and the expansion head are engaged with each other through teeth and tooth grooves. A bayonet for the guide pin to enter is provided on the side of the ring away from the expansion head. When the support rod moves toward the side of the expansion head to open a plurality of reaming claws, the guide pin moves into the bayonet and drives the ring and the expansion head to rotate along the inclined section.

5. The handheld portable pipe reamer according to claim 2, characterized in that: The transmission assembly also includes a planetary gear reducer, an input end of the planetary gear reducer is connected to the motor shaft of the motor, and an output end of the planetary gear reducer is connected to the eccentric gear.

6. The handheld portable pipe reamer according to claim 5, characterized in that: The main body includes a main shell, a sleeve and a front ring. The bottom of the main shell is provided with a plug-in portion extending downward, and the plug-in portion is inserted into the holding portion and connected with the holding portion. The planetary gear reducer is installed in the plug-in portion. The sleeve is installed in the main shell, and the front end is exposed from the main shell. The front ring is connected to the exposed front end of the sleeve. The support rod is arranged in the sleeve. The end of the support rod opposite to the eccentric gear is provided with a pin shaft, and the driven gear is arranged on the pin shaft. The two ends of the pin shaft protrude from both sides of the support rod. The sleeve is provided with two second guide grooves corresponding to the two ends of the pin shaft respectively. The two ends of the pin shaft are respectively inserted in the two second guide grooves and move along the second guide grooves to limit the support rod to move in a straight line.

7. The handheld portable pipe reamer according to claim 6, characterized in that: The expansion head is connected to the front ring, and an annular groove is provided on the inner wall of the front ring. The outer sides of several reaming claws are provided with convex edges. When several reaming claws are matched, the convex edges are combined to form an outer ring edge that is engaged with the annular groove. A space is provided between the reaming claws and the inner wall of the front ring for the reaming claws to move outward and expand. The second elastic member includes an elastic rubber ring, which is sleeved on the outer sides of the convex edges of several reaming claws, and the convex edges are provided with grooves for the elastic rubber rings to be inserted into.

8. The handheld portable pipe reamer according to claim 1, characterized in that: The axis of the motor is perpendicular to the moving direction of the support rod.

9. The handheld portable pipe reamer according to claim 1, characterized in that: The end of the support rod opposite to the expansion head is conical, and the inner surface of the reaming claw is provided with a groove, and the groove forms a conical support hole for the support rod to be inserted after a plurality of reaming claws are matched.

10. The handheld portable pipe reamer according to claim 1, characterized in that: A battery pack mounting portion is provided at the bottom of the grip portion for sliding insertion of the battery pack.

Images