Electric tightening shaft

Abstract

The embodiment of the utility model discloses an electric tightening shaft which comprises an elbow assembly, a planetary reducer, a motor, a bit and a spline housing, the planetary reducer is connected with the outer side of the motor through a motor nut, the output end of the motor is connected with one end of the planetary reducer, and the other end of the planetary reducer is connected with the spline housing. The rear end of the bit is connected with the front end of the spline housing, the rear end of the sensor is installed at the front end of the planetary reducer, the outer side of the spline housing is connected with the sensor through two bearings, the front end of the spline housing is provided with a clamping spring and a limiting pin, and the rear end of the motor is connected with the elbow assembly through a rear end bearing seat. According to the screw tightening device, the sensor is easy to install and accurate in collection, meanwhile, it is guaranteed that the screwdriver head and a screw can be tightly attached all the time, and the tightening effect is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to tightening device technical field, concretely relates to a kind of electric tightening shaft. BACKGROUND

[0002] The working principle of the existing tightening device is that the motor drives the chuck to rotate through planetary reducer after speed reduction and torque amplification, and the sensor collects the screw tightening torque. The sensor of the current tightening device is difficult to install, the collected data is not accurate, and the chuck is directly connected with the reducer. Sometimes, the chuck cannot be tightly attached to the screw to be tightened, resulting in poor tightening effect. SUMMARY

[0003] The utility model provides a kind of electric tightening shaft, sensor installation is simple, accurate acquisition, guarantee chuck and screw can be always attached tightly, guarantee tightening effect.

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

[0005] The electric tightening shaft includes an elbow assembly, a planetary reducer, a motor, a chuck and a spline sleeve. The planetary reducer is connected to the outside of the motor through a motor nut. The output end of the motor is connected to one end of the planetary reducer. The other end of the planetary reducer is connected to the spline sleeve. The rear end of the chuck is connected to the front end of the spline sleeve. The rear end of the sensor is installed on the front end of the planetary reducer. The outside of the spline sleeve is connected to the sensor through two bearings. The front end of the spline sleeve is installed with a circlip and a limit pin. The rear end of the motor is connected to the elbow assembly through a rear bearing seat. The motor shaft rear end is installed on the bearing in the rear bearing seat.

[0006] Preferably, the outside of the spline sleeve is connected to the sensor through a needle bearing and a deep groove ball bearing.

[0007] Preferably, it further includes a dust cover one and a dust cover two. The dust cover one and the dust cover two are installed on the front end of the sensor. The front end of the dust cover one and the dust cover two is fixed through a bottom plate. The front end of the bottom plate is fixedly connected to the sensor through a nut.

[0008] Preferably, a stepped mechanism is provided on the inside of the sensor. A spacer sleeve is provided between the rear end of the deep groove ball bearing and the planetary reducer.

[0009] Preferably, the spline sleeve is of hollow structure. The rear end of the chuck is provided with a spring mounting groove. A baffle is installed on the inside of the rear end of the spline sleeve. A guide shaft is installed on the front end of the baffle. A spring is installed in the spring mounting groove of the chuck. The other end of the spring is installed on the guide shaft.

[0010] Preferably, a protective sleeve is installed between the dust cover and the rear bearing housing, a PCB board is installed inside the rear bearing housing, a sensor adapter cable is installed at the sensor, the sensor adapter cable passes through the protective sleeve, and the other end of the sensor adapter cable is installed on the PCB board.

[0011] Preferably, a magnet mount is installed at the rear end of the motor, a magnet is mounted on the magnet mount, and a magnetic encoder is mounted on the PCB board, with the magnetic encoder facing the magnet.

[0012] Preferably, the rear end of the sensor is threadedly connected to the internal gear ring of the planetary reducer.

[0013] Preferably, the elbow assembly includes elbow one and elbow two. One end of elbow one is connected to the rear bearing seat. The end faces of elbow one and elbow two that meet are provided with grooves. A locating pin is installed at elbow two. One end of the locating pin is located in the groove. Elbow one and elbow two are locked together by multiple plungers.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] The sensor of this invention is fixedly connected to the internal gear ring of the planetary reducer via a thread, enabling precise acquisition of screw tightening torque. Installation is simple and reliable. A spring is installed in the spring mounting slot of the screwdriver bit, with the other end of the spring mounted on the guide shaft. The screwdriver bit can move axially within the spline sleeve. During debugging or operation, when an external drive source causes the entire tool to overshoot axially, the spring provides a buffering effect and ensures the screwdriver bit remains firmly in contact with the screw. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an embodiment of the present utility model.

[0017] Figure 2 This is a schematic diagram from another perspective of an embodiment of the present utility model.

[0018] Figure 3 This is an exploded view of an embodiment of the present invention.

[0019] Figure 4 This is a cross-sectional view of an embodiment of the present utility model.

[0020] Figure 5 This is a schematic diagram of the bit in an embodiment of this utility model.

[0021] Figure 6 This is a schematic diagram of the spline sleeve according to an embodiment of the present utility model.

[0022] Figure 7 This is a schematic diagram of an elbow according to an embodiment of this utility model.

[0023] Figure 8 This is a schematic diagram of the second elbow according to an embodiment of this utility model. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] As shown in the figure, this utility model discloses an electric tightening shaft, including an elbow assembly 1, a planetary reducer 2, a motor 3, a screwdriver bit 4, and a spline sleeve 5. The planetary reducer 2 is connected to the outer side of the motor 3 via a motor nut 6. The output end of the motor 3 is connected to one end of the planetary reducer 2, and the other end of the planetary reducer 2 is connected to the spline sleeve 5. The rear end of the screwdriver bit 4 is connected to the front end of the spline sleeve 5. The rear end of a sensor 7 is mounted on the front end of the planetary reducer 2. The outer side of the spline sleeve 5 is connected to the sensor 7 via two bearings. A retaining ring 8 and a limiting pin 9 are installed on the front end of the spline sleeve 5. The rear end of the motor 3 is connected to the elbow assembly 1 via a rear bearing seat 10. The rear end of the motor shaft 31 of the motor 3 is mounted on a bearing located inside the rear bearing seat 10. The rear end of the sensor is fixedly connected to the internal gear ring of the planetary reducer via threads, which can accurately collect the screw tightening torque and is simple and reliable to install.

[0026] In one embodiment of this invention, the outer side of the spline sleeve 5 is connected to the sensor 7 via a needle roller bearing 11 and a deep groove ball bearing 12. The combination of the thrust bearing and the deep groove ball bearing allows for greater torque bearing capacity, more stable operation, and higher precision.

[0027] In one embodiment of this utility model, a dust cover 13 and a dust cover 14 are also included. The dust cover 13 and the dust cover 14 are installed at the front end of the sensor 7. The front ends of the dust cover 13 and the dust cover 14 are fixed by a base plate 15. The front end of the base plate 15 is fixedly connected to the sensor 7 by a nut 16.

[0028] In one embodiment of this utility model, a stepped mechanism is provided inside the sensor 7, and a spacer 17 is provided between the rear end of the deep groove ball bearing 12 and the planetary reducer 2. The spacer 17 is used to fix the deep groove ball bearing 12.

[0029] In one embodiment of this utility model, the spline sleeve 5 has a hollow structure, and the rear end of the bit 4 is provided with a spring mounting groove 41. A baffle 18 is installed on the inner side of the rear end of the spline sleeve 5, and a guide shaft 19 is installed at the middle of the front end of the baffle 18. A spring 20 is installed at the spring mounting groove 41 of the bit 4, and the other end of the spring 20 is installed on the guide shaft 19. The bit 4 can move axially within the spline sleeve 5. During debugging or operation, when an external drive source causes the tool to overshoot axially, the spring 20 can provide a certain buffering effect and keep the bit 4 in close contact with the screw.

[0030] In one embodiment of this utility model, a protective sleeve 21 is installed between the dust cover 14 and the rear bearing housing 10. A PCB board 22 is installed inside the rear bearing housing. A sensor adapter cable 23 is installed at the sensor location. The sensor adapter cable 23 passes through the protective sleeve 21, and the other end of the sensor adapter cable 23 is mounted on the PCB board 22. The protective sleeve 21 is used to protect the sensor adapter cable 23.

[0031] In one embodiment of this utility model, a magnet holder 24 is installed at the rear end of the motor 3, a magnet 25 is installed on the magnet holder 24, and a magnetic encoder is installed on the PCB board 22, with the magnetic encoder facing the magnet 25. The magnetic encoder collects the angle during the screw tightening process.

[0032] In one embodiment of this utility model, the rear end of the sensor 7 is threadedly connected to the internal gear ring of the planetary reducer 2.

[0033] In one embodiment of this utility model, the elbow assembly 1 includes an elbow 26 and an elbow 27. One end of the elbow 26 is connected to the rear bearing seat 10. The end faces of the elbow 26 and the elbow 27 that meet are provided with a groove 261. A positioning pin 28 is installed at the elbow 27, with one end of the positioning pin 28 located in the groove 261. The elbow 26 and the elbow 27 are locked together by multiple plungers 29. A connector 30 is installed at the end of the elbow 27. The positioning pin and the groove 261 limit the movement of the elbow 2, allowing it to rotate only by the angle of the groove 261, such as 350 degrees. The connector uses only a single cable integrating communication and power lines to connect to the control box, resulting in higher integration.

[0034] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of this utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. An electric tightening shaft, characterized in that: The assembly includes an elbow assembly, a planetary reducer, a motor, a screwdriver bit, and a splined sleeve. The planetary reducer is connected to the outside of the motor via a motor nut. The output end of the motor is connected to one end of the planetary reducer, and the other end of the planetary reducer is connected to the splined sleeve. The rear end of the screwdriver bit is connected to the front end of the splined sleeve. The rear end of the sensor is mounted on the front end of the planetary reducer. The outside of the splined sleeve is connected to the sensor via two bearings. A snap ring and a limit pin are mounted on the front end of the splined sleeve. The rear end of the motor is connected to the elbow assembly via a rear bearing housing. The rear end of the motor shaft is mounted on a bearing located in the rear bearing housing.

2. The electric tightening shaft according to claim 1, characterized in that: The outer side of the spline sleeve is connected to the sensor via needle roller bearings and deep groove ball bearings.

3. The electric tightening shaft according to claim 1, characterized in that: It also includes dust cover one and dust cover two, which are installed at the front end of the sensor. The front ends of dust cover one and dust cover two are fixed by a base plate, and the front end of the base plate is fixedly connected to the sensor by a nut.

4. The electric tightening shaft according to claim 2, characterized in that: The sensor has a stepped mechanism inside, and a spacer is provided between the rear end of the deep groove ball bearing and the planetary reducer.

5. The electric tightening shaft according to claim 1, characterized in that: The spline sleeve has a hollow structure. The rear end of the bit has a spring mounting groove. A baffle is installed on the inner side of the rear end of the spline sleeve. A guide shaft is installed at the middle of the front end of the baffle. A spring is installed in the spring mounting groove of the bit. The other end of the spring is installed on the guide shaft.

6. The electric tightening shaft according to claim 3, characterized in that: A protective sleeve is installed between the dust cover and the rear bearing housing. A PCB board is installed inside the rear bearing housing. A sensor adapter cable is installed at the sensor location. The sensor adapter cable passes through the protective sleeve, and the other end of the sensor adapter cable is installed on the PCB board.

7. The electric tightening shaft according to claim 6, characterized in that: A magnet mount is installed at the rear of the motor, a magnet is mounted on the magnet mount, and a magnetic encoder is mounted on the PCB board, with the magnetic encoder facing the magnet.

8. The electric tightening shaft according to claim 1, characterized in that: The rear end of the sensor is threadedly connected to the internal gear ring of the planetary reducer.

9. The electric tightening shaft according to claim 1, characterized in that: The elbow assembly includes elbow one and elbow two. One end of elbow one is connected to the rear bearing housing. The end faces of elbow one and elbow two are provided with grooves. A locating pin is installed at elbow two, with one end of the locating pin located in the groove. Elbow one and elbow two are locked together by multiple plungers.

Images