An electric pipe wrench

Abstract

An electric pipe wrench, comprising: a housing, the housing includes a handle, both sides of the front end of the handle are respectively connected to telescopic connecting arms through rotating shafts, and the front ends of each telescopic connecting arm are respectively connected to semi-circular clamping arms through rotating shafts; a clamping assembly, there are two sets of clamping assemblies, and the two sets of clamping assemblies cooperate to contract inward for clamping and screwing the pipe fittings; a clamping assembly driving mechanism, the clamping assembly driving mechanism is installed in the housing for driving the operation of the two sets of clamping assemblies; a clamping arm opening and closing mechanism, the clamping arm opening and closing mechanism is installed in the housing for driving the opening and closing of the two semi-circular clamping arms. It has large torque, stable structure and low failure rate. By driving two sets of mechanisms of the clamping assembly driving mechanism and the clamping arm opening and closing mechanism with one motor, it can not only realize the automatic opening and closing of the two semi-circular clamping arms, but also realize the clamping and screwing of the pipe fittings, with high automation degree, and the structure is compact, making reasonable and full use of the space inside the handle.

Description

Technical Field:

[0001] The present invention relates to the technical field of pipe wrenches, and particularly to an electric pipe wrench. Background Art:

[0002] A pipe wrench refers to a pair of pliers that rely on two toothed jaws to clamp and rotate a pipe or other cylindrical surface. Most of the existing pipe wrenches are manual pipe wrenches, which have slow operation speed, are time-consuming and laborious, and have low disassembly and assembly efficiency. Especially when operating in a narrow space, normal force application cannot be carried out, and it is very difficult to complete the operation, thus affecting normal construction. Although some electric pipe wrenches have emerged in the market in recent years, the existing electric pipe wrenches have small torque, are prone to the situation of not tightening firmly, have poor structural stability, are easy to be damaged, have a high failure rate, and have a low degree of automation. Some require manual cooperation to open and close the pipe wrench, and some require manual gripping to clamp the pipe. All of the above can only reach the semi-electric level. When in use, a staff member holds the electric pipe wrench with one hand and still needs the other hand to cooperate for operation, and it cannot be operated in some narrow spaces where hand assistance is unavailable. There is currently no good solution to the above problems. Summary of the Invention:

[0003] In order to make up for the deficiencies of the prior art, the present invention provides an electric pipe wrench with reasonable structural design, large torque, stable structure, low failure rate, and high degree of automation, solving the problems existing in the prior art.

[0004] The technical solution adopted by the present invention to solve the above technical problems is as follows:

[0005] An electric pipe wrench, comprising:

[0006] A housing, the housing includes a handle, and both sides of the front end of the handle are respectively connected to telescopic connecting arms through rotating shafts. The front end of each telescopic connecting arm is respectively connected to a semi-circular clamping arm through a rotating shaft. One ends of the two semi-circular clamping arms close to the handle are connected through a rotating shaft, and the other ends are arranged to be openable and closable. The two semi-circular clamping arms are butted to form a ring for clamping pipe fittings;

[0007] A clamping assembly, there are two sets of the clamping assemblies, which are respectively installed in the two semi-circular clamping arms, and the two sets of clamping assemblies cooperate to contract inward for clamping and screwing the pipe fittings;

[0008] A clamping assembly driving mechanism, the clamping assembly driving mechanism is installed in the housing for driving the operation of the two sets of clamping assemblies;

[0009] A clamping arm opening and closing mechanism, the clamping arm opening and closing mechanism is installed in the housing for driving the opening and closing of the two semi-circular clamping arms.

[0010] The clamping assembly driving mechanism and the clamping arm opening and closing mechanism are connected to a motor installed in the housing through a main clutch gear set installed in the housing.

[0011] The main clutch gear set includes:

[0012] A motor gear, which is connected to the output shaft of the motor;

[0013] A clamping arm opening and closing drive gear, which meshes with the motor gear and is connected to the clamping arm opening and closing mechanism;

[0014] A clamping component clutch gear, which is installed in the handle and includes a forward rotation clutch gear and a reverse rotation clutch gear mounted on a rocker. The forward rotation clutch gear and the reverse rotation clutch gear mesh with the motor gear. The rocker is installed on the output shaft of the motor, and positive rotation electromagnets and reverse rotation electromagnets are respectively provided on both sides of the other end of the rocker. Return springs are respectively provided on both sides of the middle of the rocker;

[0015] A clamping component drive gear, which can be disengaged and engaged with the forward rotation clutch gear and the reverse rotation clutch gear, and is connected to the clamping component drive mechanism.

[0016] The clamping component drive mechanism includes:

[0017] A main reduction gear set, which is installed in the handle and includes two large reduction gears respectively meshing with the clamping component drive gear. Reduction small gears are respectively meshed on both sides of the two large reduction gears;

[0018] A drive link mechanism, which includes drive rods respectively arranged in the handle and connected to the two reduction small gears. The other end of the drive rod is connected to a telescopic transmission rod arranged in the telescopic connecting arm through a universal joint. The other end of the telescopic transmission rod is connected to a worm through a universal joint, and the worm is connected to the clamping component.

[0019] The clamping arm opening and closing mechanism includes:

[0020] A secondary clutch gear set, which includes a secondary reduction gear set installed in the handle and meshing with the clamping arm opening and closing drive gear. The secondary reduction gear set is connected to a clutch gear that can be translated on a shaft. An attracting block is installed on one side of the clutch gear, and a clutch electromagnet is provided on one side of the attracting block. The other side of the clutch gear can be disengaged and engaged with a screw drive gear;

[0021] A screw, which is threadedly connected to the screw drive gear and passes through the handle and is connected to the connection part of the rotating shafts of the two semi-circular clamping arms.

[0022] A touch block is provided on the screw, and grooves are respectively provided at the front and rear ends of the touch block. A contact switch matching the grooves is provided at the front end in the handle.

[0023] The clamping component includes:

[0024] The driving wheel, the driving wheel includes two butt-jointed semi-ring wheels, the outer side of the driving wheel meshes with the worm, and a plurality of pushing blocks are uniformly and fixedly installed on the driving wheel;

[0025] The driven wheel, the driven wheel includes two butt-jointed semi-ring wheels, and a plurality of arc-shaped clamping rods are uniformly installed on the driven wheel through spring rotating shafts. The number of the arc-shaped clamping rods is the same as that of the pushing blocks, and the positions of the arc-shaped clamping rods are arranged in a staggered manner with respect to the pushing blocks;

[0026] The driving wheel pushes the free ends of the arc-shaped clamping rods to contract inward through the pushing blocks, and the driving wheel drives the driven wheel and the arc-shaped clamping rods to rotate through the pushing blocks to clamp and twist the pipe fitting.

[0027] Detachable anti-slip teeth are installed on the inner sides of the free ends of the arc-shaped clamping rods.

[0028] Buckles are respectively arranged on the outer sides of the driving wheel and the driven wheel, and positioning pins matched with the buckles are arranged in the semi-circular clamping arms. One of the positioning pins is a positioning pin with a contact point.

[0029] Elastic locks and electromagnets for controlling the opening and closing of the elastic locks are installed at the opening and closing ends of the two semi-circular clamping arms.

[0030] Adopting the above scheme, the present invention has the following advantages:

[0031] The driving wheel and the driven wheel are synchronously driven by two sets of driving link mechanisms to rotate to clamp the pipe fitting. The torque is large, the structure is stable, and the failure rate is low. By driving two sets of mechanisms of the clamping component driving mechanism and the clamping arm opening and closing mechanism with one motor, the automatic opening and closing of the two semi-circular clamping arms can be realized, and the clamping and twisting of the pipe fitting can also be realized. The automation degree is high, and the structure is compact, making reasonable and full use of the space inside the handle. Brief description of the drawings:

[0032] Figure 1 It is a schematic structural diagram of the present invention.

[0033] Figure 2 It is a schematic structural diagram of the main clutch gear set of the present invention.

[0034] Figure 3 It is a schematic structural diagram of the main reduction gear set of the present invention.

[0035] Figure 4 It is a schematic structural diagram of the combination of the driving wheel and the driven wheel of the present invention.

[0036] Figure 5 It is an enlarged schematic structural diagram of the auxiliary clutch gear set of the present invention.

[0037] Figure 6Schematic structural diagram of the driving wheel of the present invention.

[0038] Figure 7 Schematic structural diagram of the driven wheel of the present invention.

[0039] Figure 8 Schematic structural diagram of the positioning pin of the present invention.

[0040] Figure 9 Schematic structural diagram of the positioning pin with a contact point of the present invention.

[0041] Figure 10 Enlarged schematic structural diagram of the elastic lock of the present invention.

[0042] Figure 11 Enlarged schematic structural diagram of the contact block and the contact switch part of the present invention.

[0043] In the figure, 1. Handle, 2. Telescopic connecting arm, 3. Semi-circular clamping arm, 4. Motor, 5. Motor gear, 6. Clamping arm opening and closing drive gear, 7. Rocker, 8. Forward rotation clutch gear, 9. Reverse rotation clutch gear, 10. Forward rotation electromagnet, 11. Reverse rotation electromagnet, 12. Return spring, 13. Clamping assembly drive gear, 14. Large reduction gear, 15. Small reduction gear, 16. Drive rod, 17. Telescopic transmission rod, 18. Worm, 19. Sub-clutch gear set, 20. Clutch gear, 21. Suction block, 22. Clutch electromagnet, 23. Screw drive gear, 24. Screw, 25. Contact block, 26. Contact switch, 27. Driving wheel, 28. Push block, 29. Driven wheel, 30. Arc-shaped clamping rod, 31. Anti-slip teeth, 32. Bayonet, 33. Positioning pin, 34. Elastic lock, 35. Electromagnet. Specific embodiments:

[0044] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with its accompanying drawings.

[0045] As Figures 1-11 shown, an electric pipe wrench includes:

[0046] A housing, the housing includes a handle 1, both sides of the front end of the handle 1 are respectively connected to the telescopic connecting arm 2 through a rotating shaft, the front end of each telescopic connecting arm 2 is respectively connected to the semi-circular clamping arm 3 through a rotating shaft, one end of the two semi-circular clamping arms 3 close to the handle 1 is connected through a rotating shaft, and the other end is arranged to be openable and closable. The two semi-circular clamping arms 3 are butted to form a ring for clamping pipe fittings;

[0047] A clamping assembly, there are two sets of the clamping assemblies, which are respectively installed in the two semi-circular clamping arms 3, and the two sets of clamping assemblies cooperate to contract inward for clamping and screwing the pipe fittings;

[0048] The clamping component driving mechanism is installed in the housing and used to drive the operation of two sets of clamping components;

[0049] The clamping arm opening and closing mechanism is installed in the housing and used to drive the opening and closing of two semi-circular clamping arms 3.

[0050] The clamping component driving mechanism and the clamping arm opening and closing mechanism are connected to the motor 4 installed in the housing through the main clutch gear set installed in the housing, realizing the operation of two sets of mechanisms, namely the clamping component driving mechanism and the clamping arm opening and closing mechanism, driven by one motor 4, and reasonably and fully utilizing the space inside the handle. The motor 4 can be powered by the storage battery installed in the handle 1 or by connecting to an external power supply through a wire. One-key operation can be realized through the button provided on the handle 1.

[0051] The main clutch gear set is as Figure 2 shown and includes:

[0052] The motor gear 5, which is connected to the output shaft of the motor 4;

[0053] The clamping arm opening and closing driving gear 6, which meshes with the motor gear 5 and is connected to the clamping arm opening and closing mechanism;

[0054] The clamping component clutch gear is installed in the handle 1 and includes a forward rotation clutch gear 8 and a reverse rotation clutch gear 9 installed on the rocker 7. The forward rotation clutch gear 8 and the reverse rotation clutch gear 9 mesh with the motor gear 5. The rocker 7 is installed on the output shaft of the motor 4. On both sides of the other end of the rocker 7, a forward rotation electromagnet 10 and a reverse rotation electromagnet 11 are respectively provided. On both sides of the middle of the rocker 7, a return spring 12 is respectively provided;

[0055] The clamping component driving gear 13 can be disengaged and engaged with the forward rotation clutch gear 8 and the reverse rotation clutch gear 9, and the clamping component driving gear 13 is connected to the clamping component driving mechanism.

[0056] The motor gear 5 is always in mesh with the clamping arm opening and closing drive gear 6, the forward rotation clutch gear 8, and the reverse rotation clutch gear 9. When the forward rotation electromagnet 10 works, the forward rotation electromagnet 10 sucks the free end of the rocker 7 downward, and the rocker 7 will drive the forward rotation clutch gear 8 and the reverse rotation clutch gear 9 to rotate clockwise, so that the forward rotation clutch gear 8 meshes with the clamping assembly drive gear 13, and the reverse rotation clutch gear 9 disengages from the clamping assembly drive gear 13; conversely, when the reverse rotation electromagnet 11 works, the reverse rotation electromagnet 11 sucks the free end of the rocker 7 upward, and the rocker 7 will drive the forward rotation clutch gear 8 and the reverse rotation clutch gear 9 to rotate counterclockwise, so that the reverse rotation clutch gear 9 meshes with the clamping assembly drive gear 13, and the forward rotation clutch gear 8 disengages from the clamping assembly drive gear 13; the forward and reverse rotations of the clamping assembly drive gear 13 are realized, thereby realizing the forward and reverse rotations of the clamping assembly. When neither the forward rotation electromagnet 10 nor the reverse rotation electromagnet 11 works, under the action of the return spring 12, the free end of the rocker 7 will be in the middle position between the two. At this time, the forward rotation clutch gear 8, the reverse rotation clutch gear 9 and the clamping assembly drive gear 13 are in a disengaged state.

[0057] The clamping assembly drive mechanism includes:

[0058] The main reduction gear set, as Figure 3 shown, the main reduction gear set is installed in the handle 1 and includes two large reduction gears 14 that are respectively meshed with the clamping assembly drive gear 13, and reduction small gears 15 are respectively meshed on both sides of the two large reduction gears 14;

[0059] The drive link mechanism, as Figure 1 shown, the drive link structure includes drive rods 16 that are respectively arranged in the handle 1 and connected to the two reduction small gears 15. The other end of the drive rod 16 is connected to a telescopic transmission rod 17 arranged in the telescopic connecting arm 3 through a universal joint. The other end of the telescopic transmission rod 17 is connected to a worm 18 through a universal joint, and the worm 18 is connected to the clamping assembly.

[0060] When the clamping assembly drive gear 13 rotates, it drives the two large reduction gears 14 to rotate. The two large reduction gears 14 then drive the two reduction small gears 15 to rotate. The two reduction small gears 15 respectively drive the two drive rods 16 to rotate. The two drive rods 16 then drive the two telescopic transmission rods 17 to rotate. The two telescopic transmission rods 17 then drive the two worms 18 to rotate. The two worms 18 drive the clamping assembly to rotate, realizing the clamping and screwing of the pipe fitting.

[0061] The clamping arm opening and closing mechanism includes:

[0062] The auxiliary clutch gear set, the auxiliary clutch gear set includes an auxiliary reduction gear set 19 installed in the handle 1 and meshed with the clamping arm opening and closing drive gear 6, as Figure 5As shown, the secondary reduction gear set 19 includes a number of meshing large and small gears. The secondary reduction gear set 19 is connected to a clutch gear 20 that can be translated on the shaft. A spring is provided on the shaft to reset the clutch gear 20. A suction block 21 is installed on one side of the clutch gear 20, and a clutch electromagnet 22 is provided on one side of the suction block 21. The other side of the clutch gear 20 is detachably connected to a screw drive gear 23. When the clutch electromagnet 22 works, it can be attracted to the suction block 21, driving the clutch gear 20 to translate along the shaft, so that the clutch gear 20 disengages from the screw drive gear 23. When the clutch electromagnet 22 does not work, the clutch gear 20 is reset under the action of the spring and meshes with the screw drive gear 23.

[0063] A screw 24, the screw 24 is threadedly connected to the screw drive gear 23, and the screw 24 passes through the handle 1 and is connected to the rotating shaft connection of the two semi-circular clamping arms 3.

[0064] As Figure 11 shown, a touch block 25 is provided on the screw 24, grooves are provided at the front and rear ends of the touch block 25, and a contact switch 26 that cooperates with the grooves is provided at the front end inside the handle 1.

[0065] The clamping arm opening and closing drive gear 6 drives the secondary reduction gear set 19 to operate. The secondary reduction gear set 19 drives the clutch gear 20 to rotate. The clutch gear 20 then drives the screw drive gear 23 to rotate, thereby driving the screw 24 to move forward and backward. When the screw 24 moves forward, it will push forward the rotating shaft connection of the two semi-circular clamping arms 3. When the groove at the front end of the touch block 25 touches the contact switch 26, the contact switch 26 will feedback a signal to remind of the movement in place, thereby opening the two semi-circular clamping arms 3. When the screw 24 moves backward, it will pull backward the rotating shaft connection of the two semi-circular clamping arms 3. When the groove at the rear end of the touch block 25 touches the contact switch 26, the contact switch 26 will feedback a signal to remind of the movement in place, thereby closing the two semi-circular clamping arms 3.

[0066] The clamping assembly includes: as Figure 4 、 6 、7 shown,

[0067] A driving wheel 27, the driving wheel 27 includes two butt-jointed semi-ring wheels. The outside of the driving wheel 27 meshes with the worm 18, and a number of push blocks 28 are uniformly and fixedly installed on the driving wheel 27;

[0068] A driven wheel 29, the driven wheel 29 includes two butt-jointed semi-ring wheels. A number of arc-shaped clamping rods 30 are uniformly installed on the driven wheel 29 through spring shafts. The number of the arc-shaped clamping rods 30 is the same as that of the push blocks 28, and the positions of the arc-shaped clamping rods 30 are arranged in a staggered manner with those of the push blocks 28;

[0069] The driving wheel 27 pushes the free end of the arc-shaped clamping rod 30 to retract inward through the pushing block 28, and the driving wheel 27 drives the driven wheel 29 and the arc-shaped clamping rod 30 to rotate through the pushing block 28 to clamp and tighten the pipe fitting.

[0070] The worm 18 drives the driving wheel 27 to rotate. Figure 4 As shown in the figure, when the driving wheel 27 rotates clockwise, the driving wheel 27 pushes the free end of the arc-shaped clamping rod 30 to retract inwardly through the pushing block 28, and the driving wheel 27 drives the driven wheel 29 to rotate continuously to tighten the pipe fitting. The free end of the arc-shaped clamping rod 30 is installed with a detachable anti-skid tooth 31 on the inner side, which can play an anti-skid role. The anti-skid tooth 31 is detachable and convenient for replacement after damage; when the driving wheel 27 rotates counterclockwise, the pushing block 28 gradually leaves the free end of the arc-shaped clamping rod 30, and the arc-shaped clamping rod 30 is automatically reset under the action of the spring shaft, thereby loosening the pipe fitting.

[0071] like Figure 8 , 9 As shown, the driving wheel 27 and the driven wheel 29 are provided with bayonet 32 ​​on the outside, respectively, and the semicircular clamping arm 3 is provided with a positioning pin 33 matched with the bayonet 32, wherein one of the positioning pins 33 is a positioning pin with a contact, and the positioning pin 33 is an elastic positioning pin, which is always in contact with the driving wheel 27 and the driven wheel 29. In the initial state, the positioning pin 33 is just stuck in the bayonet 32, and when the driving wheel 27 rotates clockwise, the bayonet 32 ​​is separated from the positioning pin 33, and does not affect the normal clockwise rotation; when the driving wheel 27 rotates counterclockwise, when the bayonet 32 ​​moves to the position of the positioning pin 33, the positioning pin 33 will block the bayonet 32, and the positioning pin 33 with a contact will send a signal to remind that it is in place, so that the driving wheel 27 stops rotating, and at this time, it is just restored to the initial state position.

[0072] like Figure 10 As shown, the opening and closing ends of the two semicircular clamping arms 3 are equipped with an elastic lock 34 and an electromagnet 35 for controlling the opening and closing of the elastic lock 34. When the electromagnet 35 is working, it will be attracted by the elastic lock 34, and the other end of the elastic lock 34 will be tilted, thereby opening the two semicircular clamping arms 3; conversely, when the electromagnet 35 is not working, the elastic lock 34 is reset under the action of the spring, and the undercut at the other end of the elastic lock 34 will lock the two semicircular clamping arms 3.

[0073] Working principle:

[0074] During operation, first control the electromagnet 35 to work, causing the other end of the elastic latch 34 to tilt up and open the two semi-circular clamping arms 3. Then start the motor 4. At this time, the forward rotation electromagnet 10, the reverse rotation electromagnet 11, and the clutch electromagnet 22 are all not working. The forward rotation clutch gear 8, the reverse rotation clutch gear 9, and the clamping assembly drive gear 13 are in a disengaged state. The motor gear 5 only drives the clamping arm opening and closing drive gear 6 to rotate. The clamping arm opening and closing drive gear 6 drives the secondary reduction gear set 19 to operate. The secondary reduction gear set 19 drives the clutch gear 20 to rotate. The clutch gear 20 then drives the screw drive gear 23 to rotate, thereby driving the screw 24 to move forward. When the contact block 25 on the screw 24 touches the contact switch 26, the contact switch 26 will feedback a signal to remind of the movement in place. At this time, the two semi-circular clamping arms 3 can be opened, and then the pipe fitting is placed between the two semi-circular clamping arms 3. Then control the motor 4 to reverse, causing the screw 24 to move backward to close the two semi-circular clamping arms 3. Then control the clutch electromagnet 22 to work. When the clutch electromagnet 22 works, it can be attracted to the suction block 21, driving the clutch gear 20 to translate along the axis, causing the clutch gear 20 to disengage from the screw drive gear 23. Then control the forward rotation electromagnet 10 to work. The forward rotation electromagnet 10 attracts the free end of the rocker 7 downward, and the rocker 7 will drive the forward rotation clutch gear 8 and the reverse rotation clutch gear 9 to rotate clockwise, causing the forward rotation clutch gear 8 to mesh with the clamping assembly drive gear 13 and the reverse rotation clutch gear 9 to disengage from the clamping assembly drive gear 13. The forward rotation clutch gear 8 drives the clamping assembly drive gear 13 to rotate. The clamping assembly drive gear 13 then drives the two large reduction gears 14 to rotate. The two large reduction gears 14 then drive the two small reduction gears 15 to rotate. The two small reduction gears 15 respectively drive the two drive rods 16 to rotate. The two drive rods 16 then drive the two telescopic transmission rods 17 to rotate. The two telescopic transmission rods 17 then drive the two worm gears 18 to rotate. The two worm gears 18 drive the driving wheel 27 to rotate. When the driving wheel 27 rotates clockwise, the driving wheel 27 pushes the free end of the arc-shaped clamping rod 30 on the driven wheel 29 inward through the push block 28. The driving wheel 27 drives the driven wheel 29 to continuously rotate to complete the tightening work of the pipe fitting.

[0075] After the tightening operation is completed, control the reverse electromagnet 11 to operate. The reverse electromagnet 11 sucks the free end of the rocker 7 upward. The rocker 7 will drive the forward clutch gear 8 and the reverse clutch gear 9 to rotate counterclockwise, causing the reverse clutch gear 9 to engage with the clamping assembly drive gear 13 and the forward clutch gear 8 to disengage from the clamping assembly drive gear 13. The reverse clutch gear 9 drives the clamping assembly drive gear 13 to rotate. The clamping assembly drive gear 13 then drives the two large reduction gears 14 to rotate. The two large reduction gears 14 then drive the two small reduction gears 15 to rotate. The two small reduction gears 15 respectively drive the two drive rods 16 to rotate. The two drive rods 16 then drive the two telescopic drive rods 17 to rotate. The two telescopic drive rods 17 then drive the two worm gears 18 to rotate. The two worm gears 18 drive the driving wheel 27 to rotate. When the driving wheel 27 rotates counterclockwise, the push block 28 gradually moves away from the free end of the arc-shaped clamping rod 30. The arc-shaped clamping rod 30 automatically resets under the action of the spring shaft, thereby loosening the pipe fitting. Then control the forward electromagnet 10 and the reverse electromagnet 11 to stop working. Under the action of the return spring 12, the free end of the rocker 7 will be in the middle position between the two. At this time, the forward clutch gear 8, the reverse clutch gear 9 and the clamping assembly drive gear 13 are in a disengaged state. Then control the clutch electromagnet 22 to stop working. The clutch gear 20 resets and engages with the screw drive gear 23 under the action of the spring. The clutch gear 20 drives the screw drive gear 23 to rotate, thereby driving the screw 24 to move forward. When the contact block 25 on the screw 24 touches the contact switch 26, the contact switch 26 will feedback a signal to remind of the movement in place, thereby opening the two semi-circular clamping arms 3, and then the pipe fitting can be removed to complete the entire operation.

[0076] The above specific embodiments cannot be used as a limitation to the protection scope of the present invention. For those skilled in the art of this technology, any alternative improvement or transformation made to the embodiments of the present invention falls within the protection scope of the present invention.

[0077] The parts not detailed in the present invention are all well-known technologies to those skilled in the art of this technology.

Claims

1. An electric pipe wrench, characterized in that: It includes: A housing, the housing includes a handle, both sides of the front end of the handle are respectively connected to telescopic connecting arms through rotating shafts, the front end of each telescopic connecting arm is respectively connected to a semi-circular clamping arm through a rotating shaft, one ends of the two semi-circular clamping arms close to the handle are connected through a rotating shaft, and the other ends are arranged to be openable and closable. The two semi-circular clamping arms are butted to form a ring for clamping pipe fittings; Clamping assemblies, there are two sets of clamping assemblies, which are respectively installed in the two semi-circular clamping arms, and the two sets of clamping assemblies cooperate to contract inward for clamping and screwing the pipe fittings; A clamping assembly driving mechanism, the clamping assembly driving mechanism is installed in the housing for driving the operation of the two sets of clamping assemblies; A clamping arm opening and closing mechanism, the clamping arm opening and closing mechanism is installed in the housing for driving the opening and closing of the two semi-circular clamping arms; The clamping assembly driving mechanism and the clamping arm opening and closing mechanism are connected to a motor installed in the housing through a main clutch gear set installed in the housing; The main clutch gear set includes: A motor gear, the motor gear is connected to the output shaft of the motor; A clamping arm opening and closing driving gear, the clamping arm opening and closing driving gear meshes with the motor gear, and the clamping arm opening and closing driving gear is connected to the clamping arm opening and closing mechanism; A clamping assembly clutch gear, the clamping assembly clutch gear is installed in the handle, and includes a forward rotation clutch gear and a reverse rotation clutch gear installed on a rocker. The forward rotation clutch gear and the reverse rotation clutch gear mesh with the motor gear. The rocker is installed on the output shaft of the motor, and positive rotation electromagnets and reverse rotation electromagnets are respectively arranged on both sides of the other end of the rocker, and return springs are respectively arranged on both sides of the middle of the rocker; A clamping assembly driving gear, the clamping assembly driving gear can be disengaged and engaged with the forward rotation clutch gear and the reverse rotation clutch gear, and the clamping assembly driving gear is connected to the clamping assembly driving mechanism.

2. An electric pipe wrench according to claim 1, characterized in that: The clamping assembly driving mechanism includes: A main reduction gear set, the main reduction gear set is installed in the handle, and includes two large reduction gears respectively meshing with the clamping assembly driving gear, and reduction small gears are respectively meshed on both sides of the two large reduction gears; A driving link mechanism, the driving link mechanism includes driving rods respectively arranged in the handle and connected to the two reduction small gears. The other end of the driving rod is connected to a telescopic transmission rod arranged in the telescopic connecting arm through a universal joint. The other end of the telescopic transmission rod is connected to a worm through a universal joint, and the worm is connected to the clamping assembly.

3. An electric pipe wrench according to claim 1, characterized in that: The clamping arm opening and closing mechanism includes: A secondary clutch gear set, the secondary clutch gear set includes a secondary reduction gear set installed in the handle and meshing with the clamping arm opening and closing driving gear. The secondary reduction gear set is connected to a clutch gear that can be translated on a shaft. A suction block is installed on one side of the clutch gear, a clutch electromagnet is arranged on one side of the suction block, and the other side of the clutch gear can be disengaged and connected to a screw driving gear; A screw, the screw is threadedly connected to the screw driving gear, and the screw passes through the handle and is connected to the rotating shaft connection part of the two semi-circular clamping arms.

4. An electric pipe wrench according to claim 3, characterized in that: The screw rod is provided with a contact block, and grooves are respectively arranged at the front and rear ends of the contact block. A contact switch matched with the groove is arranged at the inner front end of the handle.

5. An electric pipe wrench according to claim 2, characterized in that: The clamping assembly includes: a driving wheel, the driving wheel includes two butt-jointed semi-ring wheels, the outside of the driving wheel is meshed with a worm, and a plurality of pushing blocks are uniformly and fixedly installed on the driving wheel; a driven wheel, the driven wheel includes two butt-jointed semi-ring wheels, and a plurality of arc-shaped clamping rods are uniformly installed on the driven wheel through spring rotating shafts. The number of the arc-shaped clamping rods is the same as that of the pushing blocks, and the positions of the arc-shaped clamping rods are arranged in a staggered manner with those of the pushing blocks; The driving wheel pushes the free ends of the arc-shaped clamping rods to contract inward through the pushing blocks, and the driving wheel drives the driven wheel and the arc-shaped clamping rods to rotate through the pushing blocks to clamp and twist the pipe fitting.

6. An electric pipe wrench according to claim 5, characterized in that: Detachable anti-slip teeth are installed on the inner sides of the free ends of the arc-shaped clamping rods.

7. An electric pipe wrench according to claim 5, characterized in that: Buckles are respectively arranged on the outsides of the driving wheel and the driven wheel, and positioning pins matched with the buckles are arranged in the semi-circular clamping arms, and one of the positioning pins is a positioning pin with a contact point.

8. An electric pipe wrench according to claim 1, characterized in that: An elastic lock and an electromagnet for controlling the opening and closing of the elastic lock are installed at the opening and closing ends of the two semi-circular clamping arms.

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