Screwdriver

Abstract

An embodiment of the present invention discloses a screwdriver, which includes a housing, a motor, a speed reducer, and a dynamic torque sensor. The rear end of the housing is connected to the rear end of the motor. The rear end of the motor is connected to a first PCB board. The first PCB board is connected to a cable assembly. The front end of the motor, the dynamic torque sensor, and the speed reducer are all arranged inside the housing. The output end of the motor is connected to the speed reducer. The speed reducer is connected to the front end of the bit. The dynamic torque sensor is installed outside the bit. The bit passes through the dynamic torque sensor. A second PCB board is provided on the dynamic torque sensor. The second PCB board is wirelessly connected to the first PCB board. The present invention improves the torque sensor to enhance the acquisition accuracy of torque.

Description

Technical Field

[0001] The present invention relates to a tool for tightening and loosening screws, and particularly to a screwdriver. Background Art

[0002] A screwdriver is a commonly used tool for turning screws to make them in place, usually having a thin wedge-shaped head that can be inserted into the slot or notch of the screw head. Currently, electric screwdrivers use torque sensors to obtain torque information. However, current torque sensors are all fixedly installed, and in some cases, they are not concentric, resulting in inaccurate acquisition accuracy. At the same time, due to the use of wired connection, torque loss will occur, which also leads to inaccurate accuracy. Summary of the Invention

[0003] The present invention provides a screwdriver that improves the torque sensor to enhance the acquisition accuracy of torque.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A screwdriver, comprising a housing, a motor, a speed reducer, and a dynamic torque sensor. The rear end of the housing is connected to the rear end of the motor. The rear end of the motor is connected to PCB board 1. PCB board 1 is connected to a cable assembly. The front end of the motor, the dynamic torque sensor, and the speed reducer are all arranged inside the housing. The output end of the motor is connected to the speed reducer. The speed reducer is connected to the front end of the bit. The dynamic torque sensor is installed outside the bit. The bit passes through the dynamic torque sensor. There is a PCB board 2 on the dynamic torque sensor. PCB board 2 is wirelessly connected to PCB board 1.

[0006] Preferably, the dynamic torque sensor includes a sensor housing. The bit is located in the middle inside the sensor housing. The bit is connected to the sensor housing through bearings. A transmitting coil and PCB board 2 are installed on the bit. A receiving coil is installed on the inner wall of the sensor housing. The receiving coil corresponds to the transmitting coil.

[0007] Preferably, a PCB mounting seat is installed on the bit. Both the transmitting coil and PCB board 2 are installed on the PCB mounting seat.

[0008] Preferably, the sensor housing includes a first cylindrical tube, a second cylindrical tube, and a baffle. The outer diameters of the first cylindrical tube and the second cylindrical tube are the same. The baffle is arranged at the end of the first cylindrical tube. The end of the first cylindrical tube is connected to the second cylindrical tube. The bearings include a first bearing and a second bearing. The first bearing is installed in the middle of the baffle. The second bearing is installed on the inner wall of the second cylindrical tube. The bit is installed on the first bearing and the second bearing. The rear end of the speed reducer is located inside the first cylindrical tube.

[0009] Preferably, the receiving coil, the transmitting coil, and PCB board 2 are all located inside the second cylindrical tube.

[0010] Preferably, a base is installed at the tail of the second cylindrical barrel. The base includes a first fixing block and a second fixing block. The first fixing block is attached to the inner wall of the second cylindrical barrel, and the outer diameter of the second fixing block is equal to the outer diameter of the second cylindrical barrel. The bit passes through the base.

[0011] Preferably, a connector sheath is installed at the tail of the outer shell. The connector sheath is located at the rear end of the base, and the outer end of the connector sheath is located outside the outer shell.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] In the present invention, by integrating a dynamic torque sensor into the screwdriver and directly feeding back the actual tightening torque by the bit, since the torque is directly collected through the output bit without transmission loss, the torque accuracy is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of an embodiment of the present invention.

[0015] Figure 2 is an exploded schematic diagram of an embodiment of the present invention.

[0016] Figure 3 is a sectional view of an embodiment of the present invention.

[0017] Figure 4 is a sectional view of the dynamic torque sensor of an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] As shown in the figure, an embodiment of the present invention discloses a screwdriver, which includes an outer shell 1, a motor 2, a reducer 3, and a dynamic torque sensor 4. The rear end of the outer shell 1 is connected to the rear end of the motor 2. The rear end of the motor 2 is connected to a first PCB board 5. The first PCB board 5 is connected to a cable assembly 6. The front end of the motor 2, the dynamic torque sensor 4, and the reducer 3 are all arranged inside the outer shell 1. The output end of the motor 2 is connected to the reducer 3. The reducer 3 is connected to the front end of the bit 7. The dynamic torque sensor 4 is installed outside the bit 7. The bit 7 passes through the dynamic torque sensor 4. A second PCB board 8 is provided on the dynamic torque sensor 4. The second PCB board 8 is wirelessly connected to the first PCB board 5.

[0020] Working principle: Press the start trigger located on the outer shell 1, the motor 2 starts, drives the bit 7 to rotate after reducing the speed and amplifying the torque through the speed reducer 3, collects the tightening torque of the screw through the built-in dynamic torque sensor 4, the second PCB board 8 wirelessly transmits the torque to the first PCB board 5, and the first PCB board 5 uploads the torque data to the host computer, and the tightening torque is displayed through the host computer.

[0021] In this product, by integrating the dynamic torque sensor in the screwdriver, the actual tightening torque is directly feedback by the output bit. Since the torque is directly collected through the output bit without transmission loss, the torque accuracy is higher.

[0022] In an embodiment of the present invention, the dynamic torque sensor 4 includes a sensor housing 9, the bit 7 is located in the middle inside the sensor housing 9, the bit 7 is connected to the sensor housing 9 through a bearing, and the bearing installs the bit 7 to ensure the stable rotation of the bit 7. A transmitting coil 10 and a second PCB board 8 are installed on the bit 7, a receiving coil 11 is installed on the inner wall of the sensor housing 9, and the receiving coil 11 corresponds to the transmitting coil 10. The bit 7 drives the transmitting coil 10 to rotate.

[0023] In an embodiment of the present invention, a PCB mounting base 12 is installed on the bit 7, and both the transmitting coil 10 and the second PCB board 8 are installed on the PCB mounting base 12.

[0024] In an embodiment of the present invention, the sensor housing 9 includes a first cylindrical tube 91, a second cylindrical tube 92 and a baffle 93. The outer diameters of the first cylindrical tube 91 and the second cylindrical tube 92 are the same. The baffle 93 is arranged at the end of the first cylindrical tube 91, the end of the first cylindrical tube 93 is connected to the second cylindrical tube 92. The bearing includes a first bearing 13 and a second bearing 14. The first bearing 13 is installed in the middle of the baffle 93, the second bearing 14 is installed on the inner wall of the second cylindrical tube 92, the bit 7 is installed on the first bearing 13 and the second bearing 14, and the rear end of the speed reducer 3 is located inside the first cylindrical tube 91. Since the first cylindrical tube 91 needs to install the reducer, the inner diameter of the first cylindrical tube 91 is larger than the inner diameter of the second cylindrical tube 92.

[0025] In an embodiment of the present invention, the receiving coil 11, the transmitting coil 10 and the second PCB board 8 are all located inside the second cylindrical tube 92.

[0026] In an embodiment of the present invention, a base 15 is installed at the tail of the second cylindrical tube 92. The base 15 includes a first fixing block 151 and a second fixing block 152. The first fixing block 151 fits with the inner wall of the second cylindrical tube 92, the outer diameter of the second fixing block 152 is equal to the outer diameter of the second cylindrical tube 92, and the bit 7 passes through the base. The base 15 plays a role in fixing the second bearing 14.

[0027] In an embodiment of the present invention, a connector sheath 16 is installed at the tail of the housing 1. The connector sheath 16 is located at the rear end of the base, and the outer end of the connector sheath 16 is located outside the housing 1. The connector sheath 16 serves to protect the bit head.

[0028] The above content is only an example and description of the structure of the present invention. Those skilled in the art of this technology can make various modifications or supplements to the described specific embodiments or use similar methods for substitution. As long as they do not deviate from the structure of the present invention or exceed the scope defined by this claim book, they should fall within the protection scope of the present invention.

Claims

1. Screwdriver, characterized in that: It includes a housing, a motor, a speed reducer and a dynamic torque sensor. The rear end of the housing is connected to the rear end of the motor. The rear end of the motor is connected to PCB board 1. PCB board 1 is connected to a cable assembly. The front end of the motor, the dynamic torque sensor and the speed reducer are all arranged inside the housing. The output end of the motor is connected to the speed reducer. The speed reducer is connected to the front end of the bit. The dynamic torque sensor is installed outside the bit. The bit passes through the dynamic torque sensor. There is a PCB board 2 on the dynamic torque sensor. PCB board 2 is wirelessly connected to PCB board 1. The dynamic torque sensor includes a sensor housing. The bit is located in the middle inside the sensor housing. The bit is connected to the sensor housing through bearings. A transmitting coil and PCB board 2 are installed on the bit. A receiving coil is installed on the inner wall of the sensor housing. The receiving coil corresponds to the transmitting coil. There is a PCB mounting base on the bit. Both the transmitting coil and PCB board 2 are installed on the PCB mounting base. The sensor housing includes a cylindrical tube 1, a cylindrical tube 2 and a baffle. The outer diameters of the cylindrical tube 1 and the cylindrical tube 2 are the same. The baffle is arranged at the end of the cylindrical tube 1. The end of the cylindrical tube 1 is connected to the cylindrical tube 2. The bearings include bearing 1 and bearing 2. Bearing 1 is installed in the middle of the baffle. Bearing 2 is installed on the inner wall of the cylindrical tube 2. The bit is installed on bearing 1 and bearing 2. The rear end of the speed reducer is located inside the cylindrical tube 1.

2. The screwdriver according to claim 1, characterized in that: The receiving coil, the transmitting coil and PCB board 2 are all located inside the cylindrical tube 2.

3. The screwdriver according to claim 1, wherein: A base is installed at the tail of the cylindrical tube 2. The base includes a fixing block 1 and a fixing block 2. The fixing block 1 fits against the inner wall of the cylindrical tube 2. The outer diameter of the fixing block 2 is equal to the outer diameter of the cylindrical tube 2. The bit passes through the base.

4. The screwdriver according to claim 3, characterized in that: A connector sheath is installed at the tail of the housing. The connector sheath is located at the rear end of the base. The outer end of the connector sheath is located outside the housing.

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