Alternating-current electric pipe expanding tool

Abstract

The utility model relates to the technical field of pipe expanding, in particular to an alternating-current electric pipe expanding tool which comprises a shell, an expanding mechanism and a driving mechanism. The expansion head assembly is at least partially arranged in the shell, and one end of the expansion head assembly is used for being inserted into a pipe fitting for pipe expansion; the driving mechanism is arranged in the shell and comprises an input end and an output end, the output end is in transmission connection with the expansion head assembly, and the input end is used for inputting alternating current to the driving mechanism; the driving mechanism comprises a stator assembly and a rotor assembly, the stator assembly is fixedly arranged in the shell, the rotor assembly is rotationally connected to the shell, at least part of the rotor assembly is arranged in the stator assembly, and the rotor assembly is in transmission connection with the expansion head assembly. According to the alternating-current electric pipe expanding tool, power can be directly supplied to the alternating-current electric pipe expanding tool through the mains supply, a battery pack does not need to be installed in the shell, and the cost of the pipe expanding tool is reduced on the premise that the endurance of the battery pack does not need to be considered.

Description

Technical Field

[0001] This application relates to the field of pipe expansion technology, and in particular to an AC electric pipe expansion tool. Background Technology

[0002] With rapid societal development, pipe fittings are being used more and more frequently. However, because pipe fittings are mass-produced and uniformly round in diameter, they are not suitable for various applications. Existing pipe expanders work by inserting their end into the pipe fitting and rotating a tapered expansion head. These tools are all driven by DC motors, requiring battery packs to operate. However, battery-powered expanders are expensive and have limited battery life. Utility Model Content

[0003] This application provides an AC electric tube expander tool to solve the technical problem of limited battery life of DC tube expanders.

[0004] This application provides an AC electric pipe expander, comprising:

[0005] case;

[0006] An expansion head assembly is at least partially disposed within the housing, with one end of the expansion head assembly used for insertion into the pipe fitting to expand the pipe.

[0007] The drive mechanism is located inside the housing. The drive mechanism includes an input end and an output end. The output end is connected to the extension head assembly for transmission, and the input end is used to input AC power to the drive mechanism.

[0008] The drive mechanism includes a stator assembly and a rotor assembly. The stator assembly is fixedly disposed within the housing, and the rotor assembly is rotatably connected to the housing and at least partially disposed within the stator assembly. The rotor assembly is drively connected to the extension head assembly.

[0009] As one of the optional embodiments of this solution, the rotor assembly is provided with a drive shaft group, and the rotor assembly is connected to the extension head assembly through the drive shaft group; the drive mechanism also includes a reduction gearbox; the drive shaft group includes a first drive shaft and a second drive shaft, the first drive shaft is coaxially connected to the rotor assembly, the second drive shaft is coaxially connected to the side of the first drive shaft away from the rotor assembly, and the end of the second drive shaft away from the first drive shaft is connected to the reduction gearbox, and the reduction gearbox is connected to the extension head assembly.

[0010] As one of the optional embodiments of this solution, the stator assembly includes a stator winding and a stator core, with the stator winding disposed inside the stator core.

[0011] As one of the optional embodiments of this solution, the rotor assembly includes a rotor and a fan, with the rotor located inside the stator core and the fan connected between the drive shaft assembly and the rotor.

[0012] As one of the optional embodiments of this solution, the drive mechanism also includes a carbon brush box. Two carbon brush boxes are provided, fixed to the housing, and arranged circumferentially along the rotor assembly.

[0013] As one of the optional embodiments of this solution, the housing has a handheld part, the handheld part is provided with a switch, the switch is electrically connected to the drive mechanism, and the transmission shaft assembly is located inside the handheld part.

[0014] As one of the optional embodiments of this solution, the extended head assembly includes a cam, a transmission column, a motion shaft, and a first ejector pin. The cam is connected to the gearbox for transmission, and the transmission column contacts the outer peripheral wall of the cam so that the transmission column moves radially along the cam. The transmission column is connected to the motion shaft, and the first ejector pin is located at the end of the transmission shaft assembly away from the transmission column. The diameter of the first ejector pin gradually decreases along the side away from the transmission column.

[0015] As one of the optional embodiments of this solution, the extension head assembly also includes a rotating sleeve and a guide sleeve. Both the rotating sleeve and the guide sleeve are sleeved on the motion shaft. The rotating sleeve is sleeved on the side closer to the first ejector pin, and the guide sleeve is sleeved on the side farther away from the first ejector pin. A guide groove is provided on the guide sleeve, which is opened along the axial direction of the motion shaft. The transmission column is at least partially slidably disposed in the guide groove. An elastic element is sleeved on the motion shaft, with one end of the elastic element contacting the rotating sleeve and the other end contacting the transmission column.

[0016] As one of the optional embodiments of this solution, the extension head assembly also includes a connecting sleeve, a fixing sleeve, and a second ejector pin. The connecting sleeve is fitted onto the rotating sleeve, and the fixing sleeve is threaded onto the connecting sleeve. Multiple second ejector pins are provided. The second ejector pins are fitted onto the outside of the first ejector pins and are connected to the fixing sleeve. The second ejector pins are arranged circumferentially along the first ejector pins.

[0017] As one of the optional embodiments of this solution, the end of the second ejector pin away from the fixing sleeve is provided with anti-slip texture, and the diameter of the second ejector pin gradually decreases in the direction away from the fixing sleeve.

[0018] One of the above technical solutions has the following advantages or beneficial effects:

[0019] The AC electric pipe expander provided in this application is powered by AC electricity and can be directly powered by mains power, eliminating the need for a battery pack inside the casing and reducing the cost of the expander without considering battery life. This application also makes the expander easier for the operator to hold during operation. Attached Figure Description

[0020] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure of the AC electric pipe expander provided in this application;

[0022] Figure 2 This is a schematic diagram of the internal structure of the AC electric pipe expander provided in this application;

[0023] Figure 3 This is a schematic diagram of the structure of the AC electric pipe expander head assembly provided in this application;

[0024] Figure 4 This is an exploded view of the AC electric pipe expander provided in this application.

[0025] Figure 5 This is an internal sectional view of the AC electric pipe expander provided in this application.

[0026] Figure label:

[0027] 1. Housing; 11. Handheld part; 12. Switch; 2. Extension head assembly; 21. Cam; 22. Drive column; 23. Motion shaft; 24. First ejector pin; 25. Rotating sleeve; 251. Connecting sleeve; 252. Fixing sleeve; 26. Guide sleeve; 27. Guide groove; 28. Elastic element; 29. ​​Second ejector pin; 291. Anti-slip texture; 3. Drive mechanism; 31. Input end; 32. Output end; 33. Stator assembly; 34. Rotor assembly; 341. Rotor; 342. Fan; 35. Gearbox; 36. Drive shaft assembly; 361. First drive shaft; 362. Second drive shaft; 37. Carbon brush box; 4. Cable. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the term "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, the character " / " in this document, unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship.

[0030] See Figure 1 , Figure 2 , Figure 4This application provides an AC electric pipe expander to solve the problems of existing pipe expanders requiring battery packs for operation, resulting in high costs and limited battery life. Specifically, the AC electric pipe expander provided in this application includes a housing 1, an expansion head assembly 2, a drive mechanism 3, and a cable 4. The expansion head assembly 2 is at least partially disposed within the housing 1, and one end of the expansion head assembly 2 is used to insert into the pipe for expansion. The drive mechanism 3 includes an input end 31 and an output end 32. The output end 32 is drively connected to the expansion head assembly 2, and the input end 31 is electrically connected to the cable 4. The cable 4 is used to connect AC power so that the AC power can be conducted to the drive mechanism 3, converting electrical energy into mechanical energy, thereby driving the expansion head assembly 2 to move and expand the pipe. The drive mechanism 3 includes a stator assembly 33, a rotor assembly 34, and a reduction gearbox 35. The stator assembly 33 is fixedly disposed within the housing 1, and the rotor assembly 34 is rotatably connected to the housing 1. At least a portion of the rotor assembly 34 is disposed within the stator assembly 33. A transmission shaft assembly 36 is provided on the rotor assembly 34. The rotor assembly 34, transmission shaft assembly 36, reduction gearbox 35, and expansion head assembly 2 are connected in sequence. The AC electric pipe expander provided in this application is powered by AC electricity to the drive mechanism 3. The drive mechanism 3 drives the expansion head assembly 2 to move, with one end of the expansion head assembly 2 extending into the pipe to achieve pipe expansion. The AC electric pipe expander provided in this application is driven by AC electricity and can be directly powered by mains electricity, eliminating the need for a battery pack installed in the housing and reducing the cost of the pipe expander without considering battery life.

[0031] For further details, please refer to [link / reference]. Figure 2 In this application, the drive shaft assembly 36 includes a first drive shaft 361 and a second drive shaft 362. The first drive shaft 361 is coaxially connected to the rotor assembly 34, and the second drive shaft 362 is coaxially connected to the side of the first drive shaft 361 away from the rotor assembly 34. The end of the second drive shaft 362 away from the first drive shaft 361 is connected to the reduction gearbox 35, and the reduction gearbox 35 is connected to the extension head assembly 2.

[0032] The drive mechanism 3 drives the first transmission shaft 361 to rotate, and 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 rotation power into low-speed rotation to meet certain scenarios that require low-speed rotation.

[0033] For further details, please refer to [link / reference]. Figure 1 and Figure 2In this embodiment, the housing 1 has a handheld portion 11, and a switch 12 is embedded in the handheld portion 11. The switch 12 is electrically connected to the drive mechanism 3, and the drive mechanism 3 can be controlled to move or stop by operating the switch 12. A transmission shaft assembly 36 is disposed within the handheld portion 11. By providing the transmission shaft assembly 36 and placing it within the handheld portion 11, the size of the handheld portion 11 of the housing 1 can be reduced, making it easier for the operator to grip when using the AC electric tube expander. It is understood that the lengths of the first transmission shaft 361 and the second transmission shaft 362 can be set as needed, and the number of transmission shaft assemblies 36 can also be set as needed to achieve a good grip effect, which is not limited here.

[0034] Specifically, in some embodiments, the stator assembly 33 includes a stator winding and a stator core, with the stator winding disposed within the stator core. The rotor assembly 34 includes a rotor 341 and a fan 342, with the rotor 341 disposed within the stator core and the fan 342 connected between the drive shaft assembly 36 and the rotor 341. When the AC electric expansion tool is powered on, the AC current passes through the stator winding, generating a rotating magnetic field. This magnetic field attracts the rotor 341, causing it to rotate. The rotating rotor 341 generates its own magnetic field, which interacts with the stator magnetic field to create electromagnetic torque, driving the motor to continue rotating. Furthermore, the fan 342 rotates coaxially with the rotor 341, which can reduce the temperature during motor operation, thereby extending the motor's lifespan.

[0035] The drive mechanism 3 also includes two carbon brush boxes 37, which are fixed to the housing 1 and arranged circumferentially along the rotor assembly 34. Alternating current is input to the stator windings. The stator assembly 33 is connected in series with the carbon brush boxes 37, and the carbon brush boxes 37 are connected in series with the rotor assembly 34. The carbon brush boxes 37 conduct electricity through friction in sliding contact and transfer electrical energy to the rotor 341 of the motor.

[0036] In some embodiments, see Figure 3 and Figure 4 The extended head assembly 2 includes a cam 21, a transmission column 22, a motion shaft 23, and a first ejector pin 24. The cam 21 is connected to the end of the reduction gearbox 35 away from the transmission shaft assembly 36. Specifically, the cam 21 is connected to the reduction gearbox 35 via a rotating shaft. The transmission column 22 contacts the outer peripheral wall of the cam 21 and is slidably disposed within the housing 1, allowing the transmission column 22 to move radially along the cam 21. The transmission column 22 is connected to the motion shaft 23. The end of the transmission shaft assembly away from the transmission column 22 is provided with the first ejector pin 24, the diameter of which gradually decreases along the side away from the transmission column 22.

[0037] Specifically, in this embodiment, a slot is provided inside the motion shaft 23, and a locking block is provided on the side of the first ejector pin 24 near the motion shaft 23. The locking block can be inserted into the slot and engaged with the slot, thereby fixing the first ejector pin 24. In other embodiments, the first ejector pin 24 and the motion shaft 23 can also be integrally formed, welded, or fixedly connected by bolts, which is not limited here.

[0038] First, the first ejector pin 24 is inserted into the pipe fitting. Then, the cam 21 is rotated by the drive mechanism 3 and the reduction gearbox 35. The cam 21 drives the transmission column 22 to move radially along the cam 21. As the diameter of the first ejector pin 24 gradually decreases along the side away from the transmission column 22, the first ejector pin 24 is inserted into the pipe fitting along the direction away from the cam 21 as the cam 21 rotates, thereby expanding the pipe.

[0039] For further details, please refer to [link / reference]. Figure 4 and Figure 5 The extended head assembly 2 also includes a rotating sleeve 25 and a guide sleeve 26. Both the rotating sleeve 25 and the guide sleeve 26 are sleeved on the motion shaft 23. The rotating sleeve 25 is fixed on the side close to the first ejector pin 24, and the guide sleeve 26 is fixed on the side away from the first ejector pin 24. A guide groove 27 is provided on the guide sleeve 26. The guide groove 27 is opened along the axial direction of the motion shaft 23 and passes through the guide sleeve 26 radially. The transmission column 22 is at least partially slidably disposed in the guide groove 27. An elastic element 28 is sleeved on the motion shaft 23. One end of the elastic element 28 contacts the rotating sleeve 25, and the other end contacts the transmission column 22.

[0040] In this embodiment, when the cam 21 rotates, it pushes the transmission column 22 to move towards the side closer to the tube. During the movement, the transmission column 22 compresses the elastic element 28, and the elastic element 28 contracts. After the tube expansion is completed, as the cam 21 continues to rotate, the outer wall of the side with the smaller diameter of the cam 21 rotates to the side of the transmission column 22, the elastic element 28 resets, and the transmission column 22 resets under the action of the elastic element 28, so as to facilitate the next tube expansion operation.

[0041] It is easy to understand that in this embodiment, the elastic element 28 is specifically a spring. In other embodiments, the elastic element 28 may also be a rubber sleeve, etc., which is not limited here.

[0042] Furthermore, the extension head assembly 2 also includes a connecting sleeve 251, a fixing sleeve 252, and a second ejector pin 29. The connecting sleeve 251 is sleeved on the rotating sleeve 25 and is fixedly connected to the rotating sleeve 25. The fixing sleeve 252 is threadedly connected to the connecting sleeve 251. The second ejector pin 29 is connected to the fixing sleeve 252 and is arranged circumferentially along the first ejector pin 24.

[0043] Specifically, in this embodiment, a mounting groove is provided inside the fixing sleeve 252. The mounting groove is annular, and a mounting block is fixed to one end of the second ejector pin 29 near the fixing sleeve 252. The mounting block is embedded in the mounting groove. There is a gap between two adjacent second ejector pins 29. In this embodiment, there are six second ejector pins 29. In other embodiments, the number of second ejector pins 29 can be set as needed, and is not limited here. When a pipe expansion operation is required, as the first ejector pin 24 moves towards the pipe, the first ejector pin 24 can drive the second ejector pin 29 to expand, thereby realizing the expansion of the pipe. It can be seen that the AC electric pipe expander provided by this application has a simple structure and is easy to operate.

[0044] In some embodiments, the end of the second ejector pin 29 away from the fixing sleeve 252 is provided with anti-slip texture 291, and the diameter of the second ejector pin 29 gradually decreases in the direction away from the fixing sleeve 252.

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

[0046] In summary, the AC electric reamer provided in this application can be directly driven by AC power, powered by mains electricity, eliminating the need for a battery pack inside the casing and reducing the cost of the reamer without considering battery life. Furthermore, the AC electric reamer provided in this application is easy for operators to hold, facilitating reamer operations.

[0047] The above description is only a partial implementation of the embodiments of this application and is not intended to limit the application in any way. The protection scope of the embodiments of this application is not limited thereto. Any simple modifications, equivalent changes and alterations 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 protection scope of the embodiments of this application.

Claims

1. An alternating current power expansion tool, characterized by, The utility model relates to a pipe expanding device, including: A shell (1); An expansion head assembly (2) is arranged at least partially in the shell (1), and one end of the expansion head assembly (2) is used for inserting into a pipe for pipe expansion; A drive mechanism (3) is arranged in the shell (1), the drive mechanism (3) includes an input end (31) and an output end (32), the output end (32) is in transmission connection with the expansion head assembly (2), and the input end (31) is used for inputting alternating current to the drive mechanism (3); Wherein, the drive mechanism (3) includes a stator assembly (33) and a rotor assembly (34), the stator assembly (33) is fixedly arranged in the shell (1), the rotor assembly (34) is rotatably connected to the shell (1) and is arranged at least partially in the stator assembly (33), and the rotor assembly (34) is in transmission connection with the expansion head assembly (2).

2. The AC power expansion tool of claim 1, wherein The rotor assembly (34) is provided with a transmission shaft group (36), the rotor assembly (34) is in transmission connection with the expansion head assembly (2) through the transmission shaft group (36);The drive mechanism (3) further includes a reduction gearbox (35);The transmission shaft group (36) includes 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 the side, away from the rotor assembly (34), of the first transmission shaft (361), one end, away from the first transmission shaft (361), of the second transmission shaft (362) is connected with the reduction gearbox (35), and the reduction gearbox (35) is connected with the expansion head assembly (2).

3. The AC power expansion tool of claim 2, wherein, The stator assembly (33) includes a stator winding and a stator core, and the stator winding is arranged in the stator core.

4. The AC power expansion tool of claim 3, wherein The rotor assembly (34) includes a rotor (341) and a fan (342), the rotor (341) is arranged in the stator core, and the fan (342) is connected between the transmission shaft group (36) and the rotor (341).

5. The AC power expansion tool of claim 1, wherein, The drive mechanism (3) further includes a carbon brush box (37), the carbon brush box (37) is provided with two, the carbon brush box (37) is fixed to the shell (1), and the carbon brush box (37) is arranged along the circumference of the rotor assembly (34).

6. The AC power expansion tool of claim 2, wherein, The shell (1) has a hand-held part (11), the hand-held part (11) is provided with a switch (12), the switch (12) is electrically connected with the drive mechanism (3), and the transmission shaft group (36) is arranged in the hand-held part (11).

7. The AC power expansion tool of claim 2, wherein The extension head assembly (2) comprises a cam (21), a transmission column (22), a movement shaft (23) and a first needle (24), the cam (21) is in transmission connection with the reduction 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 along the radial direction of the cam (21), the transmission column (22) is connected with the movement shaft (23), the first needle (24) is arranged at one end of the movement shaft (23) away from the transmission column (22), and the diameter of the first needle (24) gradually decreases away from the transmission column (22).

8. The AC power expansion tool of claim 7, wherein The extension head assembly (2) further comprises a rotating sleeve (25) and a guide sleeve (26), the rotating sleeve (25) and the guide sleeve (26) are sleeved on the movement shaft (23), the rotating sleeve (25) is arranged on the side close to the first needle (24), the guide sleeve (26) is arranged on the side away from the first needle (24), the guide sleeve (26) is provided with a guide groove (27), the guide groove (27) is arranged along the axial direction of the movement shaft (23), the transmission column (22) is at least partially arranged in the guide groove (27), the movement shaft (23) is sleeved with an elastic member (28), one end of the elastic member (28) is in contact with the rotating sleeve (25), and the other end of the elastic member (28) is in contact with the transmission column (22).

9. The AC power expansion tool of claim 8, wherein, The extension head assembly (2) further comprises a connecting sleeve (251), a fixing sleeve (252) and a second needle (29), the connecting sleeve (251) is sleeved on the rotating sleeve (25), the fixing sleeve (252) is threadedly connected to the connecting sleeve (251), and a plurality of second needles (29) are arranged, the second needle (29) is sleeved outside the first needle (24), the second needle (29) is connected with the fixing sleeve (252), and the second needle (29) is arranged along the circumferential direction of the first needle (24).

10. The AC power expansion tool of claim 9, wherein, One end of the second needle (29) away from the fixing sleeve (252) is provided with an anti-skid pattern (291), and the diameter of the second needle (29) gradually decreases away from the fixing sleeve (252).

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