Electric tightening wrench

Abstract

The electric tightening wrench comprises an elbow, a speed reducer, a motor assembly and a handle assembly, the rear end of the elbow is connected with a shell of the motor assembly, the rear end of the motor assembly is connected with the handle assembly, the speed reducer is installed in the elbow, one end of the speed reducer is connected with the output end of a motor of the motor assembly, and the other end of the speed reducer is connected with the handle assembly. The joint of the speed reducer and the motor is located in the torque sensor, one end of the torque sensor is installed on the speed reducer, the other end of the torque sensor is installed on the motor assembly, an input bevel gear is arranged in the elbow, one end of the input bevel gear is connected with the output end of the speed reducer, the other end of the input bevel gear is meshed with the bit, and the bit is installed at the tail end of the elbow. The tail end of the bit is located on the outer side of the elbow, the bit is perpendicular to the input bevel gear, the PCB is installed in the motor assembly, and the torque sensor is connected with the PCB through a cable. According to the utility model, a fastener can be tightened in a smaller space, and meanwhile, the torque sensor is installed in a floating manner, so that the torque acquisition precision is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a tool for tightening fasteners, in particular to an electric tightening wrench. BACKGROUND

[0002] The electric wrench is generally used by hand or cooperates with auxiliary operating rocker arms, mechanical hands and robots to control the tightening torque precisely, tighten various screws, nuts and bolts and is suitable for most industrial assembly, such as automobile and part assembly, electronic product assembly, compressor, engine, household appliance, instrument, various parts, transportation tool and part, aviation and valve. The tightening wrench is linear, which results in a long total length of the wrench and is inconvenient for manual operation. The existing wrench is long and needs a large space. In addition, the existing tightening wrench controls the rotation of the bit by the power output of the motor and the reducer to realize tightening. The current tightening wrench uses a torque sensor to obtain torque information. However, the current torque sensor is fixedly installed, which results in inaccurate torque collection. SUMMARY

[0003] The utility model provides a kind of electric tightening wrench, reduce the size of wrench whole, it can be in smaller space and tighten fastener, floating installation torque sensor is improved simultaneously, the collection accuracy of torque is improved.

[0004] To achieve the above object, the utility model provides the following technical scheme:

[0005] The electric tightening wrench includes an elbow, a speed reducer, a motor assembly and a handle assembly. The rear end of the elbow is connected with the shell of the motor assembly. The rear end of the motor assembly is connected with the handle assembly. The speed reducer is installed in the elbow. One end of the speed reducer is connected with the output end of the motor of the motor assembly. The connection between the speed reducer and the motor is located in the torque sensor. One end of the torque sensor is installed at the speed reducer. The other end of the torque sensor is installed at the motor assembly. An input bevel gear is arranged in the elbow. One end of the input bevel gear is connected with the output end of the speed reducer. The other end of the input bevel gear is engaged with the bit. The bit is installed at the end of the elbow. The end of the bit is located outside the elbow. The bit is perpendicular to the input bevel gear. A PCB is installed in the motor assembly. The torque sensor is connected with the PCB through a cable.

[0006] Preferably, the bit includes a bit body and a bit connecting part. One end of the bit body is connected with the middle of the bit connecting part. The bit connecting part is engaged with the input bevel gear. The end of the bit body is located outside the elbow.

[0007] Preferably, a cover is installed at the end of the elbow. A thrust bearing and a deep groove ball bearing are installed between the cover and the bit body.

[0008] Preferably, the elbow is provided with a bearing one, the bearing one is provided with a head mounting shaft, the head mounting shaft is connected to the middle of the head connecting part, the middle of the head connecting part is provided with a head mounting shaft mounting hole, and the head connecting part is in interference fit with the head mounting shaft.

[0009] Preferably, the input bevel gear is connected to the inner wall of the elbow through a bearing two at one end of the reducer, and the bearing two is fixed through a nut.

[0010] Preferably, the elbow is connected to the front end of the motor assembly through a locking nut.

[0011] Preferably, the motor assembly is provided with a fixing seat, the output shaft of the motor is connected to the fixing seat through a bearing three, a magnet seat is mounted at the end of the output shaft of the motor, a magnet is mounted at the magnet seat, a magnetic encoder is mounted at the front end of the PCB, the magnetic encoder corresponds to the magnet, and the PCB is mounted at the rear end of the fixing seat.

[0012] Preferably, the torque sensor comprises four circumferentially distributed clamping blocks and an outer gear ring, the clamping blocks are mounted on connecting columns, the top of the connecting columns is connected to the outer gear ring, the clamping blocks, the connecting columns and the outer gear ring are of an integrated structure, the connecting columns are of a hollow structure, the reducer is provided with an inner gear ring, the torque sensor is engaged with the reducer through the inner gear ring and the outer gear ring, the front end of the motor assembly is provided with a clamping groove corresponding to the clamping blocks, and the clamping blocks of the torque sensor are clamped in the clamping groove.

[0013] Preferably, the handle assembly is provided with a lamp strip.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] The utility model discloses a head and input bevel gear are perpendicular to set up, the motor in the motor assembly drives the reducer to rotate, the reducer drives the input bevel gear to rotate, the input bevel gear drives the head to rotate, and the head completes the fastening of fastener. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the embodiment schematic drawing of the utility model.

[0017] Figure 2 It is another visual angle schematic drawing of the embodiment of the utility model.

[0018] Figure 3 It is the explosion schematic drawing of the embodiment of the utility model.

[0019] Figure 4 It is the sectional view of the embodiment of the utility model.

[0020] Figure 5 is a torque sensor schematic diagram of the utility model embodiment.

[0021] Figure 6 is a bit section view of the utility model embodiment. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be apparently and completely described in conjunction with the drawings in the embodiments of the utility model, and apparently, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the range protected by the utility model.

[0023] As shown in the figure, the utility model discloses an electric tightening wrench, including elbow 1, speed reducer 2, motor assembly 3 and handle assembly 4, the rear end of elbow 1 is connected with the shell 31 of motor assembly 3, the rear end of motor assembly 3 is connected with handle assembly 4, speed reducer 2 is installed in elbow 1, one end of speed reducer 2 is connected with the output end of motor 32 of motor assembly, the connecting place of speed reducer 2 and motor 32 is located in torque sensor 5, one end of torque sensor 5 is installed at speed reducer 2, the other end of torque sensor 5 is installed at motor assembly 3, input bevel gear 6 is equipped in elbow 1, one end of input bevel gear 6 is connected with the output end of speed reducer 2, the other end of input bevel gear 6 is engaged with bit 7, bit 7 is installed in the end of elbow 1, the end of bit 7 is located on the outside of elbow 1, bit 7 is perpendicular to input bevel gear 6, PCB board 8 is installed in motor assembly 3, torque sensor 5 is connected with PCB board 8 through cable. The utility model sets up bit 7 and input bevel gear 6 perpendicularly, the motor in motor assembly drives speed reducer 2 to rotate, speed reducer 2 drives input bevel gear 6 to rotate, input bevel gear drives bit 7 to rotate, and bit 7 completes tightening fastener. The utility model greatly reduces the length, can complete tightening in smaller space, and can be used in the occasion with limited height and larger circumferential space.

[0024] The tail of the torque sensor is connected with the control box only by a cable integrated with communication and power lines, and the integration degree is higher.

[0025] In working, the motor drives bit to rotate through input bevel gear after reducing speed and amplifying torque through speed reducer, and completes tightening. The acquisition of screw tightening torque is completed through the built-in torque sensor.

[0026] In the embodiment of the utility model, the head 7 includes head body 71 and head connecting part 72, one end of the head body 71 is connected with the middle part of the head connecting part 72, the head connecting part 72 is engaged with the input bevel gear 6, and the tail end of the head body 71 is located outside the elbow 1. The utility model changes the structure of the head 7, which is convenient for connecting with the input bevel gear 6.

[0027] In the embodiment of the utility model, the tail end of the elbow 1 is provided with a cover 9, a thrust bearing 10 and a deep groove ball bearing 11 are installed between the cover 9 and the head body 71. The cover 9 is threadedly connected with the elbow 1, which is convenient for installing the head 7. The thrust bearing and the deep groove ball bearing are combined, can bear greater torque, run more stably, and have higher precision.

[0028] In the embodiment of the utility model, the elbow 1 is provided with a bearing one 12, a head mounting shaft 13 is installed on the bearing one 12, the head mounting shaft 13 is connected with the middle part of the head connecting part 72, the middle part of the head connecting part 72 is provided with a head mounting shaft mounting hole 721, and the head connecting part 72 is interference-fitted with the head mounting shaft 13. The head mounting shaft 13 makes the head 7 stable during work.

[0029] In the embodiment of the utility model, the input bevel gear 6 is connected with the inner wall of the elbow 1 through a bearing two 14 at one end of the speed reducer 2, and the bearing two 14 is fixed through a nut 15. The nut 15 and the bearing two 14 make the input bevel gear 6 rotate stably during work.

[0030] In the embodiment of the utility model, the elbow 1 is connected with the front end of the motor assembly 3 through a locking nut 16. The design of the locking nut 16 facilitates the installation and dismounting of the elbow 1 and the motor assembly 3.

[0031] In the embodiment of the utility model, a fixed seat 33 is arranged in the motor assembly 3, an output shaft 34 of the motor is connected with the fixed seat 33 through a bearing three 17, a magnet seat 18 is installed at the tail end of the output shaft 34 of the motor, a magnet 19 is installed at the magnet seat 18, a magnetic encoder 20 is installed at the front end of the PCB 8, the magnetic encoder 20 corresponds to the magnet 19, and the PCB 8 is installed at the rear end of the fixed seat 33. In work, the magnet 19 rotates, and the magnetic encoder 20 arranged on the PCB can collect the angle in the screw tightening process.

[0032] In the embodiment of the utility model, torque sensor 5 includes four circumferentially distributed clamping blocks 51 and an outer ring gear 52, the clamping blocks 51 are installed on connecting columns 53, the top of connecting column 53 is connected with the outer ring gear 52, the clamping blocks 51, connecting column 53 and the outer ring gear 52 are integrated structure, connecting column 53 is hollow structure, the speed reducer 2 is equipped with an inner ring gear, torque sensor 5 is engaged with the speed reducer 2 through the inner ring gear and the outer ring gear, so that torque sensor is floatingly connected with the speed reducer 2, there is a certain gap, is not fixedly connected through bolt, can effectively reduce the eccentric load in the transmission process, can more accurately collect torque. The front end of motor assembly 3 is equipped with the corresponding clamping groove 35 with clamping block 51, the clamping block 51 of torque sensor is clamped at clamping groove 35.

[0033] In the embodiment of the utility model, the handle assembly 4 is equipped with a lamp strip 21. The lamp strip can display different colors according to whether the tightening result is qualified or not, so that the user can clearly perceive.

[0034] The above content is merely an example and description of the structure of the utility model, and those skilled in the art can make various modifications or supplements or adopt similar ways to replace the described specific embodiments, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the present application, which shall belong to the protection scope of the utility model.

Claims

1. A power tightening wrench characterized by: The application relates to a torque sensor, which comprises a bend, a speed reducer, a motor assembly and a handle assembly, the rear end of the bend is connected with the shell of the motor assembly, the rear end of the motor assembly is connected with the handle assembly, the speed reducer is installed in the bend, one end of the speed reducer is connected with the output end of the motor of the motor assembly, the connection position of the speed reducer and the motor is located in a torque sensor, one end of the torque sensor is installed at the speed reducer, the other end of the torque sensor is installed at the motor assembly, an input bevel gear is arranged in the bend, one end of the input bevel gear is connected with the output end of the speed reducer, the other end of the input bevel gear is engaged with a batch head, the batch head is installed at the tail end of the bend, the tail end of the batch head is located outside the bend, the batch head is perpendicular to the input bevel gear, a PCB board is installed in the motor assembly, and the torque sensor is connected with the PCB board through a cable.

2. The electrically powered tightening wrench according to claim 1, characterized in that: The batch head comprises a batch head body and a batch head connecting part, one end of the batch head body is connected with the middle part of the batch head connecting part, the batch head connecting part is engaged with the input bevel gear, and the tail end of the batch head body is located outside the bend.

3. The electrically powered tightening wrench according to claim 2, characterized in that: A cover is installed at the tail end of the bend, a thrust bearing and a deep groove ball bearing are arranged between the cover and the batch head body.

4. The electrically powered tightening wrench according to claim 3, characterized in that: A bearing one is arranged on the bend, a batch head mounting shaft is arranged on the bearing one, the batch head mounting shaft is connected with the middle part of the batch head connecting part, the middle part of the batch head connecting part is provided with a batch head mounting shaft mounting hole, and the batch head connecting part is in interference fit with the batch head mounting shaft.

5. The electrically powered tightening wrench of claim 1, wherein: The input bevel gear is connected with the inner wall of the bend through a bearing two at one end of the speed reducer, and the bearing two is fixed through a nut.

6. The electrically powered tightening wrench of claim 1, wherein: The front end of the bend is connected with the motor assembly through a locking nut.

7. The electrically powered tightening wrench of claim 1, wherein: A fixed seat is arranged in the motor assembly, the output shaft of the motor is connected with the fixed seat through a bearing three, a magnet seat is installed at the tail end of the output shaft of the motor, a magnet is arranged at the magnet seat, a magnetic encoder is arranged at the front end of the PCB board, the magnetic encoder corresponds to the magnet, and the PCB board is installed at the rear end of the fixed seat.

8. The electrically powered tightening wrench of claim 1, wherein: The torque sensor comprises four circumferentially-distributed clamping blocks and an outer gear ring, the clamping blocks are installed on connecting columns, the top of the connecting columns is connected with the outer gear ring, the clamping blocks, the connecting columns and the outer gear ring are of an integrated structure, the connecting columns are of a hollow structure, the speed reducer is provided with an inner gear ring, the torque sensor is engaged with the speed reducer through the inner gear ring and the outer gear ring, the front end of the motor assembly is provided with a clamping groove corresponding to the clamping blocks, and the clamping blocks of the torque sensor are clamped in the clamping groove.

9. The electrically powered tightening wrench of claim 1, wherein: The handle assembly is provided with a lamp strip.

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