Ac electric pipe extension tool

Abstract

The present application relates to an AC electric pipe extension tool, comprising a housing, an extension mechanism, a driving mechanism; at least part of the extension head assembly is disposed in the housing, an end of the extension head assembly is configured to insert into a pipe fitting for pipe extending; the driving mechanism is disposed in the housing, comprising an input end and an output end, the output end is in transmission connection with the extension head assembly, the input end is configured to input AC power to the driving mechanism; the driving mechanism comprises a stator assembly and a rotor assembly, the stator assembly is fixedly disposed in the housing, the rotor assembly is rotatably connected to the housing and at least part of the rotor assembly is disposed in the stator assembly, the rotor assembly is in transmission connection with the extension head assembly.

Description

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of Chinese Patent Application No. CN 202520146401.1 filed on Jan. 21, 2025 and entitled “AN AC ELECTRIC PIPE EXTENSION TOOL”, the disclosures of which are incorporated by reference herein in their entirety.TECHNICAL FIELD

[0002] The present application relates to the field of pipe extending, in particular, relates to an AC electric pipe extension tool.BACKGROUND

[0003] With rapid development of society, the use of pipe fitting becomes increasingly frequent. However, because the pipe fittings are uniformly in a shape of cylindrical tube with a constant diameter after being shaped in mass production, they are not suitable for different applications. During the use of the existing pipe extension tool, by inserting the end into the pipe fitting and rotating the conical extension head, performing the extension of the pipe fitting. The existing pipe extension tools are all driven by DC motors, therefore, the pipe extension tools must be equipped with battery packs to operate, however, the pipe extension tools equipped with battery packs have high costs and limited battery life.SUMMARY OF THE INVENTION

[0004] The present application provides an AC electric pipe extension tool to solve the technical problems of limited battery life of the DC pipe extension tool.

[0005] The present application provides an AC electric pipe extension tool, comprising:

[0006] a housing;

[0007] an extension head assembly, at least part of the extension head assembly is disposed in the housing, an end of the extension head assembly is configured to be inserted into a pipe fitting for pipe extending;

[0008] a driving mechanism, the driving mechanism is disposed in the housing, the driving mechanism comprises an input end and an output end, the output end is in transmission connection with the extension head assembly, the input end is configured to input AC power to the driving mechanism;

[0009] wherein the driving mechanism comprises a stator assembly and a rotor assembly, the stator assembly is fixedly disposed in the housing, the rotor assembly is rotatably connected to the housing and at least part of the rotor assembly is disposed in the stator assembly, the rotor assembly is in transmission connection with the extension head assembly.

[0010] As one of the optional embodiments of the present solution, the rotor assembly is provided with a transmission shaft set, the rotor assembly is in transmission connection with the extension head assembly through the transmission shaft set; the driving mechanism further comprises a gearbox; the transmission shaft set comprises a first transmission shaft and a second transmission shaft, the first transmission shaft is coaxially connected to the rotor assembly, the second transmission shaft is coaxially connected to a side of the first transmission shaft away from the rotor assembly, an end of the second transmission shaft away from the first transmission shaft is connected to the gearbox, the gearbox is connected to the extension head assembly.

[0011] As one of the optional embodiments of the present solution, the stator assembly comprises a stator winding and a stator core, the stator winding is disposed in the stator core.

[0012] As one of the optional embodiments of the present solution, the rotor assembly comprises a rotor and a fan, the rotor is disposed in the stator core, the fan is connected between the transmission shaft set and the rotor.

[0013] As one of the optional embodiments of the present solution, the driving mechanism further comprises two carbon brush holders fixed to the housing, the carbon brush holders are arranged circumferentially along the rotor assembly.

[0014] As one of the optional embodiments of the present solution, the housing is provided with a handheld portion, the handheld portion is provided with a switch, the switch is electrically connected to the driving mechanism, the transmission shaft set is disposed in the handheld portion.

[0015] As one of the optional embodiments of the present solution, the extension head assembly comprises a cam, a transmission column, a movement shaft and a first ejector pin, the cam is in transmission connection with the gearbox, the transmission column is in contact with the outer peripheral wall of the cam, so that the transmission column moves along a radial direction of the cam, the transmission column is connected to the movement shaft, the first ejector pin is disposed at an end of the movement shaft away from the transmission column, the diameter of the first ejector pin gradually decreases along a direction away from the transmission column.

[0016] As one of the optional embodiments of the present solution, the extension head assembly further comprises a rotary sleeve and a guide sleeve, the rotary sleeve and the guide sleeve are both sleeved on the movement shaft, the rotary sleeve is disposed at a side close to the first ejector pin, the guide sleeve is disposed at a side away from the first ejector pin, a guide slot is disposed on the guide sleeve, and the guide slot is disposed along the axial direction of the movement shaft, at least part of the transmission column is slidably disposed in the guide slot, the movement shaft is sleeved with an elastic component, an end of the elastic component is in contact with the rotary sleeve, and the other end is in contact with the transmission column.

[0017] As one of the optional embodiments of the present solution, the extension head assembly further comprises a connecting sleeve, a fixed sleeve and a plurality of second ejector pins, the connecting sleeve is sleeved on the rotary sleeve, the fixed sleeve is threadedly connected to the connecting sleeve, each of the second ejector pins is sleeved on the outside of the first ejector pin, the second ejector pin is connected to the fixed sleeve, and the plurality of second ejector pins are arranged circumferentially along the first ejector pin.

[0018] As one of the optional embodiments of the present solution, an anti-slip pattern is disposed at an end of the second ejector pin away from the fixed sleeve, the diameter of the second ejector pin gradually decreases along the direction away from the fixed sleeve.

[0019] One of the aforementioned technical solutions has the following advantages or beneficial effects:

[0020] The AC electric pipe extension tool provided by the present application is driven by AC power, enabling the AC electric pipe extension tool to be directly powered by the mains electricity, without the need to install a battery pack in the housing, reducing the costs of the pipe extension tool without considering the life of the battery pack. The present application can further facilitate holding by operators when extending the pipe, and facilitate the pipe extending operation.BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following detailed description of specific embodiments of the present application, in conjunction with the accompanying drawings, will make the technical solutions and other beneficial effects of the present application apparent.

[0022] FIG. 1 is a schematic diagram of the overall structure of the AC electric pipe extension tool provided by the present application;

[0023] FIG. 2 is a schematic diagram of the internal structure of the AC electric pipe extension tool provided by the present application;

[0024] FIG. 3 is a schematic structural diagram of the extension head assembly of the AC electric pipe extension tool provided by the present application;

[0025] FIG. 4 is an exploded view of the AC electric pipe extension tool provided by the present application;

[0026] FIG. 5 is an internal cross-section view of the AC electric pipe extension tool provided by the present application;REFERENCE SIGNS

[0027] 1, housing; 11, handheld portion; 12, switch; 2, extension head assembly; 21, cam; 22, transmission column; 23, movement shaft; 24, first ejector pin; 25, rotary sleeve; 251, connecting sleeve; 252, fixed sleeve; 26, guide sleeve; 27, guide slot; 28, elastic component; 29, second ejector pin; 291, anti-slip pattern; 3, driving mechanism; 31, input end; 32, output end; 33, stator assembly; 34, rotor assembly; 35, gearbox; 36, transmission shaft set; 361, first transmission shaft; 362, second transmission shaft; 37, carbon brush holder; 4, cable.IMPLEMENTATIONS OF THE PRESENT APPLICATION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the scope of protection of this application.

[0029] In the description of this application, it should be noted that, unless otherwise explicitly stated and limited, the term “and / or” in this article is only an association relationship describing related objects, indicating that three relationships can exist, for example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character “ / ” in this article, unless otherwise specified, generally indicates that the related objects are in an “or” relationship.

[0030] Referring to FIG. 1, FIG. 2 and FIG. 4, the present application provides an AC electric pipe extension tool solving the problems that the existing pipe extension tool has to operate with a battery pack, which results in higher costs and limited battery life. Specifically, the AC electric pipe extension tool provided by the present application comprises a housing 1, an extension head assembly 2, a driving mechanism 3 and a cable 4, at least part of the extension head assembly 2 is disposed in the housing 1, an end of the extension head assembly 2 is configured to be inserted into a pipe fitting for pipe extending; the driving mechanism 3 comprises an input end 31 and an output end 32, the output end 32 is in transmission connection with the extension head assembly 2, the input end 31 is electrically connected to the cable 4, the cable 4 is configured to connect with AC power to provide the AC power to the driving mechanism 3, converting electrical energy into mechanical energy to drive the extension head assembly 2 to move, thereby achieving the extension of the pipe fitting. The driving mechanism 3 comprises a stator assembly 33, a rotor assembly 34 and a gearbox 35, the stator assembly 33 is fixedly disposed in the housing 1, the rotor assembly 34 is rotatably connected to the housing 1 and at least part of the rotor assembly 34 is disposed in the stator assembly 33, the rotor assembly 34 is provided with a transmission shaft set 36. The rotor assembly 34, the transmission shaft set 36, the gearbox 35 and the extension head assembly 2 are connected in sequence. The AC electric pipe extension tool provided by the present application supplies power to the driving mechanism 3 through AC power, and the driving mechanism 3 drives the extension head assembly 2 to move, an end of the extension head assembly 2 extends into the pipe fitting to achieve the pipe extension. The AC electric pipe expansion tool provided in the present application is driven by AC power and can be powered directly by the mains power, without the need to install a battery pack in the housing, reducing the costs of the pipe extension tool without considering the life of the battery pack.

[0031] Furthermore, referring to FIG. 2, in the present application, the transmission shaft set 36 comprises a first transmission shaft 361 and a second transmission shaft 362, the first transmission shaft 361 is coaxially connected to the rotor assembly 34, the second transmission shaft 362 is coaxially connected to a side of the first transmission shaft 361 away from the rotor assembly 34, an end of the second transmission shaft 362 away from the first transmission shaft 361 is connected to the gearbox 35, the gearbox 35 is connected to the extension head assembly 2.

[0032] The driving mechanism 3 drives the first transmission shaft 361 to rotate, the first transmission shaft 361 drives the second transmission shaft 362 to rotate, converting electrical energy into mechanical energy, and the second transmission shaft 362 converts the high-speed rotational power into low-speed rotation to meet some scenarios that require low-speed rotation.

[0033] Furthermore, referring to FIG. 1 and FIG. 2, in this embodiment, the housing 1 is provided with a handheld portion 11, a switch 12 is embedded at the location of the handheld portion 11, the switch 12 is electrically connected to the driving mechanism 3, controlling the driving mechanism 3 to move or stop moving through operating the switch 12. The transmission shaft set 36 is disposed in the handheld portion 11. By setting the transmission shaft set 36 and setting the transmission shaft set 36 in the handheld portion 11, the size of the handheld portion 11 of the housing 1 can be reduced, facilitating holding by operators when utilizing the AC electric pipe extension tool. It can be understood that, the lengths of the first transmission shaft 361 and the second transmission shaft 362 can be set according to requirements, and the number of the transmission shaft sets 36 can also be set according to requirement to achieve a good handheld effect, which is not limited here.

[0034] Specifically, in some embodiments, the stator assembly 33 comprises a stator winding and a stator core, the stator winding is disposed in the stator core. The rotor assembly 34 comprises a rotor 341 and a fan 342, the rotor 341 is disposed in the stator core, the fan 342 is connected between the transmission shaft set 36 and the rotor 341. When the AC electric pipe extension tool is powered on, the AC generates a rotating magnetic field through the stator winding, the magnetic field will attract the rotor 341 and cause it to rotate. When the rotor 341 rotates, the rotor 341 will generate its own magnetic field, which interacts with the magnetic field of the rotor to create an electromagnetic torque, driving the motor to continue rotating. Furthermore, the fan 342 and the rotor 341 rotate coaxially, helping to reduce the temperature while the motor is operating, thereby enhancing the lifespan of the motor.

[0035] The driving mechanism 3 further comprises two carbon brush holders 37, which are fixed to the housing 1, the carbon brush holders 37 are arranged circumferentially along the rotor assembly 34. The AC power is delivered to the stator winding. The stator assembly 33 is connected in series to the carbon brush holders 37, the carbon brush holders 37 are connected in series to the rotor assembly 34, the carbon brush holders 37 conducts electricity through sliding contact friction and transfers electrical energy to the rotor 341 of the motor.

[0036] In some embodiments, referring to FIG. 3 and FIG. 4, the extension head assembly 2 comprises a cam 21, a transmission column 22, a movement shaft 23 and a first ejector pin 24, the cam 21 is in transmission connection with an end of the gearbox 35 away from the transmission shaft set 36, specifically, the cam 21 is connected to the gearbox 35 through the shaft. The transmission column 22 is in contact with the outer peripheral wall of the cam 21, the transmission column 22 is slidably disposed in the housing 1, so that the transmission column 22 moves along a radial direction of the cam 21. The transmission column 22 is connected to the movement shaft 23, the first ejector pin 24 is disposed at an end of the movement shaft 23 away from the transmission column 22, the diameter of the first ejector pin 24 gradually decreases along a direction away from the transmission column 22.

[0037] Specifically, in this embodiment, a slot is disposed in the movement shaft 23, a locking block is disposed at a side of the first ejector pin 24 close to the movement shaft 23, the locking block can insert into the slot and engage with the locking block, thereby securing the first ejector pin 24. In other embodiments, the first ejector pin 24 and the movement shaft 23 can also be integrally formed, welded, or fixedly connected using bolt, which is not limited here.

[0038] Inserting the first ejector pin 24 into the pipe fitting at first, and then driving the cam 21 to rotate through the driving mechanism 3 and the gearbox 35, the cam 21 drives the transmission column 22 to move along a radial direction of the cam 21. Since the diameter of the first ejector pin 24 gradually decreases along the direction away from the transmission column 22, the first ejector pin 24 moves with the rotation of the cam 21 and inserts into the pipe fitting along the direction away from the cam 21, achieving pipe extension.

[0039] Furthermore, referring to FIG. 4 and FIG. 5, the extension head assembly 2 further comprises a rotary sleeve 25 and a guide sleeve 26, the rotary sleeve 25 and the guide sleeve 26 are both sleeved on the movement shaft 23, the rotary sleeve 25 is disposed at a side close to the first ejector pin 24, the guide sleeve 26 is fixed at a side away from the first ejector pin 24, a guide slot 27 is disposed on the guide sleeve 26, and the guide slot 27 is disposed along the axial direction of the movement shaft 23, the guide slot 27 radially penetrates through the guide sleeve 26, at least part of the transmission column 22 is slidably disposed in the guide slot 27, the movement shaft 23 is sleeved with an elastic component 28, an end of the elastic component 28 is in contact with the rotary sleeve 25, and the other end is in contact with the transmission column 22.

[0040] In this embodiment, when the cam 21 rotates, it pushes the transmission column 22 to move towards a side close to the pipe fitting. During the movement, the transmission column 22 compresses the elastic component 28, the elastic component 28 contracts. After the pipe extension is completed, with the continuous rotation of the cam 21, the outer wall of the side of the cam 21 with a smaller diameter rotates to a side of the transmission column 22, the elastic component 28 resets, the transmission column 22 resets under the action of the elastic component 28, facilitating the next pipe extension operation.

[0041] It can be understood that, in this embodiment, the elastic component 28 is specifically a spring, in other embodiments, the elastic component 28 can also be a rubber sleeve, which is not limited here.

[0042] Furthermore, the extension head assembly 2 further comprises a connecting sleeve 251, a fixed sleeve 252 and a plurality of second ejector pins 29, the connecting sleeve 251 is sleeved on the rotary sleeve 25, the connecting sleeve 251 is fixedly connected to the rotary sleeve 25, the fixed sleeve 252 is threadedly connected to the connecting sleeve 251, each of the second ejector pins 29 is connected to the fixed sleeve 252, and the plurality of second ejector pins 29 are arranged circumferentially along the first ejector pin 24.

[0043] Specifically, in this embodiment, a mounting groove is disposed in the fixed sleeve 252, the mounting groove is annular in shape, a mounting block is fixedly disposed at an end of the second ejector pin 29 close to the fixed sleeve 252, the mounting block is embedded within the mounting groove. A gap is disposed between the adjacent two second ejector pins 29. In this embodiment, there are six second ejector pins 29. In other embodiments, the number of the second ejector pins 29 can be set according to requirement, which is not limited here. When the pipe extension operation is needed, as the first ejector pin 24 moves towards a side of the pipe fitting, the first ejector pin 24 can drive the second ejector pin 29 to extend, thereby achieving the extension of the pipe fitting. It can be seen that the AC electric pipe extension tool provided by the present application is simple in structure and easy to operate.

[0044] In some embodiments, an anti-slip pattern 291 is disposed at an end of the second ejector pin 29 away from the fixed sleeve 252, the diameter of the second ejector pin 29 gradually decreases along the direction away from the fixed sleeve 252.

[0045] By setting the anti-slip pattern, the friction between the inner wall of the pipe fitting and the second ejector pin can be increased during pipe extension, preventing the occurrence of slippage between the second ejector pin and the pipe fitting, thereby achieving a better pipe extension effect.

[0046] In summary, The AC electric pipe expansion tool provided in this application can be directly driven by AC power and powered by mains power, without the need to install a battery pack in the housing, reducing the costs of the pipe extension tool without considering the life of the battery pack. In addition, the AC electric pipe extension tool provided by the present application can further facilitate holding by operators, and facilitate the pipe extending operation.

[0047] The above descriptions are merely some embodiments of this application and are not intended to limit the application in any form. The scope of protection for the embodiments of this application is not limited to these descriptions. Any simple modifications, equivalent changes, and adaptations that can be easily conceived by those skilled in the art within the technical scope disclosed in the embodiments of this application should be included within the scope of protection of these embodiments.

Claims

1. An AC electric pipe extension tool, wherein the AC electric pipe extension tool comprises:a housing (1);an extension head assembly (2), at least part of the extension head assembly (2) is disposed in the housing (1), an end of the extension head assembly (2) is configured to insert into a pipe fitting for pipe extending;a driving mechanism (3), the driving mechanism (3) is disposed in the housing (2), the driving mechanism (3) comprises an input end (31) and an output end (32), the output end (32) is in transmission connection with the extension head assembly (2), the input end (31) is configured to input AC power to the driving mechanism (3);wherein the driving mechanism (3) comprises a stator assembly (33) and a rotor assembly (34), the stator assembly (33) is fixedly disposed in the housing (1), the rotor assembly (34) is rotatably connected to the housing (1) and at least part of the rotor assembly (34) is disposed in the stator assembly (33), the rotor assembly (34) is in transmission connection with the extension head assembly (2).

2. The AC electric pipe extension tool according to claim 1, wherein the rotor assembly (34) is provided with a transmission shaft set (36), the rotor assembly (34) is in transmission connection with the extension head assembly (2) through the transmission shaft set (36); the driving mechanism (3) further comprises a gearbox (35); the transmission shaft set (36) comprises a first transmission shaft (361) and a second transmission shaft (362), the first transmission shaft (361) is coaxially connected with the rotor assembly (34), the second transmission shaft (362) is coaxially connected to a side of the first transmission shaft (361) away from the rotor assembly (34), an end of the second transmission shaft (362) away from the first transmission shaft (361) is connected with the gearbox (35), the gearbox (35) is connected with the extension head assembly (2).

3. The AC electric pipe extension tool according to claim 1, wherein the stator assembly (33) comprises a stator winding and a stator core, the stator winding is disposed in the stator core.

4. The AC electric pipe extension tool according to claim 3, wherein the rotor assembly (34) comprises a rotor (341) and a fan (342), the rotor (341) is disposed in the stator core, the fan (342) is connected between the transmission shaft set (36) and the rotor (341).

5. The AC electric pipe extension tool according to claim 1, wherein the driving mechanism (3) further comprises a carbon brush holder (37), the carbon brush holder (37) is provided with two, the carbon brush holder (37) is fixed to the housing (1), the carbon brush holder (37) is arranged circumferentially along the rotor assembly (34).

6. The AC electric pipe extension tool according to claim 1, wherein the housing (1) is provided with a handheld portion (11), the handheld portion (11) is provided with a switch (12), the switch (12) is electrically connected with the driving mechanism (3), the transmission shaft set (36) is disposed in the handheld portion (11).

7. The AC electric pipe extension tool according to claim 2, wherein the extension head assembly (2) comprises a cam (21), a transmission column (22), a movement shaft (23) and a first ejector pin (24), the cam (21) is in transmission connection with the gearbox (35), the transmission column (22) is in contact with the outer peripheral wall of the cam (21), so that the transmission column (22) moves radially along the cam (21), the transmission column (22) is connected with the movement shaft (23), the first ejector pin (24) is disposed at an end of the movement shaft (23) away from the transmission column (22), the diameter of the first ejector pin (24) gradually decreases along the direction away from a side of the transmission column (22).

8. The AC electric pipe extension tool according to claim 7, wherein the extension head assembly (2) further comprises a rotary sleeve (25) and a guide sleeve (26), the rotary sleeve (25) and the guide sleeve (26) are both sleeved on the movement shaft (23), the rotary sleeve (25) is disposed at a side close to the first ejector pin (24), the guide sleeve (26) is disposed at a side away from the first ejector pin (24), a guide slot (27) is disposed on the guide sleeve (26), and the guide slot (27) is disposed along the axial direction of the movement shaft (23), at least part of the transmission column (22) is slidably disposed in the guide slot (27), the movement shaft (23) is sleeved with an elastic component (28), an end of the elastic component (28) is in contact with the rotary sleeve (25), and the other end is in contact with the transmission column (22).

9. The AC electric pipe extension tool according to claim 8, wherein the extension head assembly (2) further comprises a connecting sleeve (251), a fixed sleeve (252) and a second ejector pin (29), the connecting sleeve (251) is sleeved on the rotary sleeve (25), the fixed sleeve (252) is threadedly connected with the connecting sleeve (251), the second ejector pin (29) is provided with a plurality, the second ejector pin (29) is sleeved over the outside of the first ejector pin (24), the second ejector pin (29) is connected with the fixed sleeve (252), and the second ejector pins (29) are arranged circumferentially along the first ejector pin (24).

10. The AC electric pipe extension tool according to claim 9, wherein an anti-slip pattern (291) is disposed at an end of the second ejector pin (29) away from the fixed sleeve (252), the diameter of the second ejector pin (29) gradually decreases along the direction away from the fixed sleeve (252).

11. The AC electric pipe extension tool according to claim 2, wherein the rotor assembly (34), the transmission shaft set (36), the gearbox (35) and the extension head assembly (2) are connected in sequence.

12. The AC electric pipe extension tool according to claim 2, wherein the driving mechanism (3) drives the first transmission shaft (361) to rotate, the first transmission shaft (361) drives the second transmission shaft (362) to rotate, converting electrical energy into mechanical energy, the second transmission shaft (362) converts the high-speed rotational power into low-speed rotation.

13. The AC electric pipe extension tool according to claim 4, wherein the fan (342) and the rotor (341) rotate coaxially.

14. The AC electric pipe extension tool according to claim 9, wherein the first ejector pin (24) moves with the rotation of the cam (21) and inserts into the pipe fitting along the direction away from the cam (21).

15. The AC electric pipe extension tool according to claim 9, wherein when the cam (21) rotates, the cam (21) pushes the transmission column (22) to move towards a side close to the pipe fitting, during the movement, the transmission column (22) compresses the elastic component (28), the elastic component (28) contracts; after the pipe extension is completed, with the continuous rotation of the cam (21), the outer wall of the smaller diameter side of the cam (21) rotates to a side of the transmission column (22), the elastic component (28) resets, the transmission column (22) resets under the action of the elastic component (28).

16. The AC electric pipe extension tool according to claim 10, wherein a mounting groove is disposed in the fixed sleeve (252), the mounting groove is annular in shape, a mounting block is fixedly disposed at an end of the second ejector pin (29) close to the fixed sleeve (252), the mounting block is embedded within the mounting groove.

17. The AC electric pipe extension tool according to claim 10, wherein a gap is disposed between the adjacent two second ejector pins (29).

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