A thread pair automatic tightening device and method based on permanent magnetic eddy current

Abstract

The present invention discloses an automatic tightening device for threaded pair based on permanent magnetic eddy current and a method thereof, the device comprises a motor, an axial adjustment member, a permanent magnetic cylinder, a conductor cylinder and a connector; the permanent magnetic cylinder comprises a permanent magnetic cylinder base, a first permanent magnet and a second permanent magnet, the rotating shaft of the permanent magnetic cylinder base and the motor shaft of the motor are coaxially connected through a coupling; a conductor cylinder is coaxially sleeved on the outer side of the permanent magnetic cylinder base; the axial length of the conductor cylinder is greater than the axial length of the permanent magnetic cylinder; the end of the conductor cylinder is fixedly connected to the connector through an output shaft; the connector is used to connect the parts to be tightened; the motor and the permanent magnetic cylinder are both placed on a support frame, and an axial adjustment member is provided on the support frame that enables the motor and the permanent magnetic cylinder to synchronously move axially relative to the conductor cylinder. As a power transmission mechanism, the present invention takes less time to achieve the required tightening torque, has good safety and scalability, and is suitable for the tightening requirements of threaded pairs in various environments.

Description

Technical Field

[0001] The invention relates to the field of automatic tightening machines for threaded pairs, and in particular to an automatic tightening device for threaded pairs based on permanent magnetic eddy currents and a method thereof. Background Art

[0002] At present, there are many automatic thread pair tightening machines, which can realize the automatic tightening process of thread pairs such as screwing bolts onto nuts or screwing nuts onto bolts. Its product features are:

[0003] 1) The number of threads to be tightened is not too many;

[0004] 2) There are certain torque requirements for tightening thread pairs;

[0005] 3) There are certain efficiency requirements for tightening thread pairs, and the tightening of thread pairs needs to be completed in a shorter time.

[0006] Threaded connection is the most common connection method on mechanical equipment, so there is a huge demand for automatic tightening of threaded pairs in the industrial field. Existing automatic tightening equipment for threaded pairs mainly uses motors and pneumatic parts as power sources, and can tighten threaded pairs at a faster speed. Automatic tightening equipment for threaded pairs also needs to control the tightening torque to meet the corresponding tightening torque requirements, otherwise it will cause damage to the threads on the nuts and bolts, and even damage the automatic tightening equipment. At present, the torque automatic control methods of automatic bolt tightening technology are mostly based on torque-angle control method, yield point method and elongation method, etc. The control accuracy varies, but the overall structure is relatively complex and the requirements for equipment are relatively high.

[0007] Permanent magnet eddy current transmission technology is a non-contact transmission technology based on Faraday electromagnetic induction, which has the advantages of flexible transmission and wide speed regulation range. Summary of the invention

[0008] In order to realize the fast and automatic tightening of the threaded pair, and apply torque control during the tightening process to avoid damage to the thread and equipment, while overcoming the shortcomings of the existing automatic tightening equipment such as high complexity. The present invention provides a threaded pair automatic tightening device based on permanent magnetic eddy current and a method thereof. The present invention integrates the permanent magnetic eddy current transmission structure into the threaded pair automatic tightening device on the basis of permanent magnetic eddy current transmission, so that the threaded pair automatic tightening device has the characteristics of torque control and is not easy to damage the thread and the automatic tightening device; through the change of the air gap or coupling area of ​​the permanent magnetic eddy current transmission mechanism, in conjunction with the motor control and the replacement of the reduction box, the requirements of different tightening torques of the threaded pair can be achieved; sleeves and tightening heads of different sizes can be used for bolts and nuts of different specifications; after the torque requirement is met, the direct tightening part will gradually stop, which can protect the threaded pair and the equipment, and achieve the tightening torque requirement at a faster speed in a short time.

[0009] The specific technical solutions adopted by the present invention are as follows:

[0010] A permanent magnetic eddy current based automatic tightening device for threaded pairs, comprising a motor, an axial adjustment member, a permanent magnetic cylinder, a conductor cylinder and a connecting member;

[0011] The permanent magnet cylinder comprises a permanent magnet cylinder base, a first permanent magnet and a second permanent magnet. The outer surface of the permanent magnet cylinder base is alternately fixed with the first permanent magnet and the second permanent magnet in the circumferential and axial directions. The polarities of the first permanent magnet and the second permanent magnet are opposite along the radial outward direction of the permanent magnet cylinder base. The rotating shaft of the permanent magnet cylinder base and the motor shaft of the motor are coaxially connected through a coupling, and the permanent magnet cylinder base can rotate synchronously under the action of the motor. A conductor cylinder is coaxially sleeved on the outside of the permanent magnet cylinder base, and a certain gap is provided between the permanent magnet cylinder base and the conductor cylinder. The axial length of the conductor cylinder is greater than the axial length of the permanent magnet cylinder, and the conductor cylinder can rotate in the same direction under the action of the permanent magnet cylinder. The end of the conductor cylinder is fixedly connected to the connecting piece through an output shaft. The connecting piece is used to connect the parts to be tightened.

[0012] The motor and the permanent magnet cylinder are both placed on a support frame, and an axial adjustment member is provided on the support frame, which can enable the motor and the permanent magnet cylinder to synchronously move axially relative to the conductor cylinder.

[0013] Preferably, the first permanent magnet and the second permanent magnet have the same size and are both NdFeB permanent magnets, which are used to generate a multi-region regular magnetic field.

[0014] Preferably, the coupling is a rigid coupling.

[0015] Preferably, the axial adjustment member includes a gear and a rack that are meshed with each other, the rack is fixedly connected to the support frame, and a knob is coaxially connected to the outer side of the gear through a rotating shaft; by turning the knob, the gear and the rack are meshed and transmitted, so that the permanent magnet tube base moves axially relative to the conductor tube.

[0016] Preferably, the knob of the axial adjustment member is further provided with a fixing component capable of fixing the rotation position of the knob.

[0017] Preferably, the rear end of the permanent magnet cylinder is coaxially connected to a plurality of permanent magnet modules to increase the magnetic field strength; the permanent magnet modules have the same radial cross-sectional dimensions as the permanent magnet cylinder, and the outer surface of the permanent magnet modules is alternately fixed with first permanent magnets and second permanent magnets.

[0018] Preferably, bearings are provided on the rotating shaft at the front end of the permanent magnet cylinder and the journal of the output shaft at the end of the conductor cylinder.

[0019] Preferably, the inner layer of the conductor tube is made of low-resistance material, and the outer layer is made of high relative magnetic permeability material; preferably, the inner layer is made of copper material, and the outer layer is made of 45# steel material.

[0020] Preferably, the output shaft is first connected to a reduction gearbox to increase the torque, and then the end of the reduction gearbox is connected to the connecting piece.

[0021] Another object of the present invention is to provide a method for automatically tightening a component to be tightened according to any of the above-mentioned thread pair automatic tightening devices, which is specifically as follows:

[0022] According to the target torque required by the component to be tightened, the permanent magnet cylinder is moved by adjusting the axial adjustment member so that the coupling area between the permanent magnet cylinder and the conductor cylinder reaches a value matching the target torque; the motor is turned on and rotated at a speed matching the target torque, and the permanent magnet cylinder is driven to rotate synchronously through the action of the coupling; the first permanent magnet and the second permanent magnet alternately arranged on the permanent magnet cylinder generate a rotating magnetic field under rotation, and the magnetic flux lines of the rotating magnetic field are cut by the conductor cylinder coupled with the part thereof, generating eddy currents on the conductor cylinder; under the action of the eddy currents, the rotating permanent magnet cylinder drives the conductor cylinder to rotate in the same direction with a speed difference, and transmits the torque of the permanent magnet cylinder to the conductor cylinder in a non-contact manner; the output shaft at the end of the conductor cylinder drives the connector to rotate, tightens the component to be tightened and reaches the target torque requirement; the conductor cylinder gradually stops rotating due to the action of resistance, and then the motor is turned off to complete the automatic tightening process of the component to be tightened.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention adopts a built-in permanent magnet eddy current transmission mechanism to transmit torque and power, and has a simple structure, high reliability, and non-contact transmission. It not only has the advantages of flexible transmission, but also can effectively avoid damage to the thread or tightening mechanism during the tightening process of the threaded pair. The present invention can obtain a tightening torque in a wide range by adjusting the axial adjustment member, extending the permanent magnet module to the permanent magnet tube base, and configuring the corresponding reduction box. By replacing connecting parts such as nut tightening heads or bolt tightening sleeves and other accessories, it can be applied to the tightening of threaded parts of different specifications and sizes. At the same time, by adjusting the axial adjustment member, reversing the power motor or replacing the reduction box, the threaded pair automatic tightening machine of the present invention can also be used as a threaded pair loosening machine. The present invention is suitable for the rapid tightening and loosening of threaded pairs with a wide range of torque requirements and threaded parts of different specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure explosion of the device of the present invention;

[0026] Figure 2 It is a schematic diagram of the structure of the present invention;

[0027] Figure 3 is a schematic structural diagram of the first permanent magnet and the second permanent magnet of the present invention;

[0028] Figure 4It is a structural schematic diagram of the axial adjustment member and the permanent magnetic cylinder of the present invention;

[0029] Figure 5 It is a structural schematic diagram of the permanent magnet module of the present invention;

[0030] Figure 6 It is a schematic structural diagram of the conductor tube of the present invention;

[0031] Figure 7 It is a structural schematic diagram of a nut tightening head and a bolt tightening sleeve;

[0032] In the figure: 1. motor, 2. coupling, 3. axial adjustment member, 4. bearing, 5. permanent magnet tube base, 6. first permanent magnet, 7. second permanent magnet, 8. flat key, 9. conductor tube, 10. reduction box, 11. nut tightening head, 12. bolt tightening sleeve, 13. permanent magnet module. DETAILED DESCRIPTION

[0033] The present invention is further described and illustrated below in conjunction with the accompanying drawings and specific embodiments. The technical features of each embodiment of the present invention can be combined accordingly without conflicting with each other.

[0034] The present invention provides a thread pair automatic tightening device based on permanent magnet eddy current, and the thread pair automatic tightening device can be used for a cylindrical permanent magnet eddy current motor or a disc-shaped permanent magnet eddy current motor. When the present invention is applied to a cylindrical permanent magnet eddy current motor, the tightening torque can be controlled by adjusting the coupling area between the permanent magnet part and the copper part. When the present invention is applied to a disc-shaped permanent magnet eddy current motor, the tightening torque can be controlled by adjusting the air gap between the permanent magnet disk and the copper disk.

[0035] In order to reduce vibration and increase the output tightening torque of the thread pair automatic tightening machine, the present invention takes the structure applied to the cylindrical permanent magnet eddy current motor as the description object. The thread pair automatic tightening device of the present invention includes a motor 1, an axial adjustment member 3, a permanent magnet cylinder, a conductor cylinder 9 and a connecting member.

[0036] like Figure 1 and 2 As shown, the permanent magnet cylinder includes a permanent magnet cylinder base 5, a first permanent magnet 6 and a second permanent magnet 7. The permanent magnet cylinder base 5 is a cylindrical structure with a hollow chamber, which mainly plays a supporting and connecting role. The first permanent magnet 6 and the second permanent magnet 7 are alternately fixed on its outer surface along the circumferential direction and the axial direction. Figure 3 As shown, the first permanent magnet 6 and the second permanent magnet 7 have opposite polarities radially outward along the permanent magnet cylinder base 5, that is, the first permanent magnet 6 is a permanent magnet with the N pole outward, and the second permanent magnet 7 is a permanent magnet with the S pole outward. In this embodiment, the first permanent magnet 6 and the second permanent magnet 7 have the same size and are both NdFeB permanent magnets, which are used to generate a multi-region regular magnetic field.

[0037] The rotating shaft of the permanent magnet cylinder base 5 and the motor shaft of the motor 1 are coaxially connected through a rigid coupling 2, so that the permanent magnet cylinder base 5 can rotate synchronously under the action of the motor 1, that is, have the same angular velocity. A bearing 4 is also provided on the shaft neck of the rotating shaft at the front end of the permanent magnet cylinder to play a supporting role when the permanent magnet rotates. The motor 1 is a power motor, which is a common motor or other type of motor that can maintain a constant output speed, and is powered by the internal power supply or external power supply of the device. Figure 4 As shown, a keyway is also provided on the inner wall of the permanent magnet tube base 5, and the torque on the rotating shaft is transmitted to the permanent magnet tube base 5 through the cooperation of the flat key 8, so that the rotating shaft drives the permanent magnet tube base 5 to rotate synchronously. At the same time, the rear end of the permanent magnet tube base is also reserved with an interface for matching and connecting with the permanent magnet module 13. The radial cross-sectional dimensions of the permanent magnet module and the permanent magnet tube are the same. Therefore, when the magnetic field strength needs to be increased, multiple permanent magnet modules can be connected to the rear end of the permanent magnet tube base to increase the overall magnetic field strength and obtain a greater torque force.

[0038] like Figure 5 As shown, the permanent magnet module 13 is also alternately distributed with the first permanent magnet 6 and the second permanent magnet 7 with different magnetic pole orientations. The two ends of the permanent magnet module 13 are respectively provided with a clamping block and a clamping slot for matching, and the permanent magnet modules 13 and the permanent magnet module 13 and the permanent magnet cylinder base can be clamped by a clamping mechanism similar to that shown in the figure. The distribution of the clamping blocks and the clamping slots shown in the figure ensures that after the permanent magnet modules 13 of the same structure are connected, the permanent magnets are still arranged alternately. For a power motor with a higher speed, the permanent magnet module 13 can be positioned and fixed with a threaded connector.

[0039] like Figure 6 As shown, a conductor cylinder 9 is coaxially sleeved on the outside of the permanent magnetic cylinder base 5, and the conductor cylinder 9 can contain the permanent magnetic cylinder base 5. At the same time, there is a certain gap between the permanent magnetic cylinder base 5 and the conductor cylinder 9. The axial length of the conductor cylinder 9 is greater than the axial length of the area where the first permanent magnet 6 and the second permanent magnet 7 are arranged on the permanent magnetic cylinder, and some space is reserved for the permanent magnetic module that may be added. The conductor cylinder 9 can rotate in the same direction under the action of the permanent magnetic cylinder. The inner layer material of the conductor cylinder 9 is made of copper and other materials with low resistance, and the outer layer is made of materials with relatively large magnetic permeability such as 45 steel.

[0040] The end of the conductor cylinder 9 is fixedly connected to the connecting piece through the output shaft, and the journal of the output shaft is provided with a bearing 4 that plays a supporting role. In practical application, in order to further increase the output torque on the basis of the existing device, the output shaft can also be connected to the reduction box 10 first, and then the end of the reduction box is connected to the connecting piece. In order to obtain different output torques of the thread pair automatic tightening machine of the present invention, the device can be equipped with reduction boxes with different reduction ratios to obtain different torques.

[0041] Connectors are used to connect parts to be tightened. Figure 7 As shown, in this embodiment, the connecting piece can be set as a nut tightening head 11 for tightening the nut or a bolt tightening sleeve 12 for tightening the bolt. The nut tightening head 11 can contain the outer hexagonal nut, and the bolt tightening sleeve 12 can contain the head of the inner hexagonal nut. In order to enable the device of the present invention to tighten nuts and bolts of different specifications and sizes, tightening heads and sleeves for nuts and bolts of different specifications and sizes can be selected in actual use. For bolts and nuts of other shapes, drill chucks and the like can be used to assist tightening, and other adapter equipment can also be used in conjunction with the automatic tightening machine for threaded pairs in the present invention.

[0042] In addition, the motor 1 and the permanent magnet tube of the device are placed on a support frame, and the support frame is provided with an axial adjustment member 3 that can make the motor 1 and the permanent magnet tube synchronously move axially relative to the conductor tube 9, thereby changing the coupling area between the permanent magnet tube and the conductor tube. In this embodiment, the axial adjustment member 3 includes a gear and a rack that are meshed and connected to each other, the rack is fixedly connected to the support frame, and a knob is coaxially connected to the outer side of the gear through a rotating shaft. By turning the knob, the gear and the rack are meshed and transmitted, so that the permanent magnet tube base 5 moves axially relative to the conductor tube 9. The knob of the axial adjustment member 3 is also provided with a fixing component that can fix the rotation position of the knob to reduce the vibration and axial movement of the device of the present invention. In order to control the output torque of the automatic tightening machine of the threaded pair of the present invention, the knob can be marked at the corresponding position to correspond to the corresponding torque, and then in the actual application process, it is only necessary to twist the knob to the position of the required torque.

[0043] When the above-mentioned thread pair automatic tightening device is used to automatically tighten the parts to be tightened, the specific method is as follows:

[0044] First, the corresponding relationship between the torque required for the parts to be tightened, the coupling area between the permanent magnet cylinder and the conductor cylinder 9 and the rotation speed of the motor 1 can be obtained through multiple indoor simulation tests.

[0045] Then, according to the target torque required for the parts to be tightened, the permanent magnet cylinder is moved by adjusting the axial adjustment member 3 so that the coupling area between the permanent magnet cylinder and the conductor cylinder 9 reaches a value matching the target torque. The motor 1 is turned on and rotated at a speed matching the target torque under the action of the built-in power supply or the external power supply, and the permanent magnet cylinder is driven to rotate synchronously through the action of the coupling 2, so that the torque and speed of the power motor are transmitted to the permanent magnet cylinder.

[0046] The first permanent magnet 6 and the second permanent magnet 7 arranged alternately on the permanent magnet cylinder generate a rotating magnetic field under rotation, and the magnetic flux lines of the rotating magnetic field are cut by the conductor cylinder (9) coupled with the rotating magnetic field, generating eddy currents on the conductor cylinder. The magnetic field generated by the eddy currents and the magnetic field generated by the permanent magnets have a strong effect, so that the rotating permanent magnet cylinder drives the conductor cylinder 9 to rotate in the same direction with a certain speed difference, and transmits the torque of the permanent magnet cylinder to the conductor cylinder 9 in a non-contact manner.

[0047] The output shaft at the end of the conductor cylinder 9 is connected to the reduction box and then to the connecting piece. When a small torque is required, the output shaft can also be directly connected to the connecting piece. The conductor cylinder drives the connecting piece and the nut or bolt contained therein to rotate, and after the thread pair reaches the target torque requirement at a faster speed. The conductor cylinder 9 gradually stops rotating due to resistance, and then the motor 1 is turned off, completing the automatic tightening process of the parts to be tightened.

[0048] In addition, in practical applications, in order to improve the accuracy of the tightening torque output by the device of the present invention, it can be used in conjunction with other torque measuring devices, and the device can be adjusted to achieve the specific torque required for tightening the thread pair. It can then be used to perform repetitive tightening work on thread pairs that need to achieve a specific tightening torque target.

[0049] In order to apply the device of the present invention to the tightening of high-precision threaded pairs, multiple experiments can be conducted to obtain the relationship between the device of the present invention and factors such as the position of the axial adjustment mechanism. The output of the torque sensor can also be used as feedback to control the power motor to further adapt to the high-precision fast tightening of threaded pairs.

[0050] The device of the present invention adopts permanent magnet eddy current non-contact transmission, which can effectively protect the thread pair and the tightening machine, tighten the thread pair at a faster speed and meet the torque requirements. The coupling area of ​​the permanent magnet cylinder and the conductor cylinder can be changed by the axial adjustment member, thereby adjusting the torque output by the automatic tightening machine of the thread pair. The device of the present invention adopts a modular design. When the maximum output torque needs to be changed, the permanent magnet module can be directly inserted into the permanent magnet cylinder to increase the magnetic field strength to increase the maximum output torque. The clamping mechanism on the permanent magnet module simplifies the assembly process and ensures the alternating distribution of the permanent magnets. The present invention can also change the torque output by the automatic tightening machine by controlling the power motor or replacing the reduction box in the device. At the same time, replacing different connecting parts such as nut tightening heads or bolt tightening sleeves and other accessories can complete the tightening of threaded parts of different specifications.

[0051] The above-described embodiment is only a preferred solution of the present invention, but it is not intended to limit the present invention. A person skilled in the relevant technical field may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. An automatic tightening device for threaded pairs based on permanent magnetic eddy current, characterized in that: It comprises a motor (1), an axial adjustment member (3), a permanent magnet cylinder, a conductor cylinder (9) and a connecting member; The permanent magnet cylinder comprises a permanent magnet cylinder base (5), a first permanent magnet (6) and a second permanent magnet (7); the first permanent magnet (6) and the second permanent magnet (7) are alternately fixed on the outer surface of the permanent magnet cylinder base (5) in the circumferential direction and the axial direction; the first permanent magnet (6) and the second permanent magnet (7) have opposite polarities radially outward from the permanent magnet cylinder base (5); the rotating shaft of the permanent magnet cylinder base (5) and the motor shaft of the motor (1) are coaxially connected via a coupling (2); the permanent magnet cylinder base (5) can rotate synchronously under the action of the motor (1); a conductor cylinder (9) is coaxially sleeved on the outside of the permanent magnet cylinder base (5); a certain gap is provided between the permanent magnet cylinder base (5) and the conductor cylinder (9); the axial length of the conductor cylinder (9) is greater than the axial length of the permanent magnet cylinder; the conductor cylinder (9) can rotate in the same direction under the action of the permanent magnet cylinder; the end of the conductor cylinder (9) is fixedly connected to the connecting piece via an output shaft; the connecting piece is used to connect the components to be tightened; The motor (1) and the permanent magnet cylinder are both placed on a support frame, and the support frame is provided with an axial adjustment member (3) capable of enabling the motor (1) and the permanent magnet cylinder to synchronously move axially relative to the conductor cylinder (9); The first permanent magnet (6) and the second permanent magnet (7) have the same size and are both neodymium iron boron permanent magnets, and are used to generate a multi-region regular magnetic field; The coupling (2) is a rigid coupling.

2. The automatic tightening device for threaded pairs according to claim 1, characterized in that: The axial adjustment member (3) comprises a gear and a rack that are meshed with each other, the rack is fixedly connected to the support frame, and a knob is coaxially connected to the outer side of the gear via a rotating shaft; by turning the knob, the gear and the rack mesh with each other, so that the permanent magnet cylinder base (5) moves axially relative to the conductor cylinder (9).

3. The automatic tightening device for threaded pairs according to claim 2, characterized in that: The knob of the axial adjustment member (3) is also provided with a fixing component capable of fixing the rotation position of the knob.

4. The automatic tightening device for threaded pairs according to claim 1, characterized in that: The rear end of the permanent magnet cylinder is also coaxially connected to a plurality of permanent magnet modules (13) for increasing the magnetic field strength; the permanent magnet modules (13) have the same radial cross-sectional dimensions as the permanent magnet cylinder, and the outer surface of the permanent magnet modules (13) is alternately fixed with first permanent magnets (6) and second permanent magnets (7).

5. The automatic tightening device for threaded pairs according to claim 1, characterized in that: Bearings (4) are provided on the rotating shaft at the front end of the permanent magnet cylinder and the journal of the output shaft at the end of the conductor cylinder (9).

6. The automatic tightening device for threaded pairs according to claim 1, characterized in that: The inner layer of the conductor tube (9) is made of a low-resistance material, and the outer layer is made of a high-relative magnetic permeability material.

7. The automatic tightening device for threaded pairs according to claim 6, characterized in that: The inner layer is made of copper material, and the outer layer is made of 45# steel material.

8. The automatic tightening device for threaded pairs according to claim 1, characterized in that: The output shaft is first connected to a reduction box (10) to increase torque, and the end of the reduction box (10) is then connected to the connecting piece.

9. A method for automatically tightening a component to be tightened using the automatic tightening device for threaded pairs according to any one of claims 1 to 8, characterized in that: The details are as follows: According to the target torque required by the component to be tightened, the permanent magnet cylinder is moved by adjusting the axial adjustment member (3) so that the coupling area between the permanent magnet cylinder and the conductor cylinder (9) reaches a value matching the target torque; the motor (1) is turned on and rotated at a speed matching the target torque, and the permanent magnet cylinder is driven to rotate synchronously through the action of the coupling (2); the first permanent magnet (6) and the second permanent magnet (7) alternately arranged on the permanent magnet cylinder generate a rotating magnetic field under rotation, and the magnetic flux lines of the rotating magnetic field are cut by the conductor cylinder (9) coupled thereto, generating eddy currents on the conductor cylinder (9); under the action of the eddy currents, the rotating permanent magnet cylinder drives the conductor cylinder (9) to rotate in the same direction with a speed difference, and transmits the torque of the permanent magnet cylinder to the conductor cylinder (9) in a non-contact manner; the output shaft at the end of the conductor cylinder (9) drives the connecting member to rotate, tightens the component to be tightened and reaches the target torque requirement; the conductor cylinder (9) gradually stops rotating due to the action of resistance, and then the motor (1) is turned off, completing the automatic tightening process of the component to be tightened.

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