Automatic screw locking device

Abstract

The present invention belongs to the technical field of screw locking machines, and in particular to an automatic screw locking device, comprising a base plate, a conveying assembly and a lifting assembly provided on the base plate, a mounting barrel provided on the lifting assembly, a gear transmission box fixed to the top of the mounting barrel, a drive motor fixed to the top of the gear transmission box, a connector fixedly connected to the output shaft of the gear transmission box, a slot provided at the bottom of the connector, a detachable electric telescopic rod inserted into the slot, a screwdriver head installed on the output shaft of the electric telescopic rod, a conveying assembly located below the mounting barrel, a pressure detection module fixed to one side inner wall of the slot, a deformation acquisition module further provided to the side of the bottom of the mounting barrel, and a control module further fixed to the top of the gear transmission box. The present invention can accurately determine whether a screw has been tightened and control the working state of the drive motor accordingly, effectively avoiding damage to the product and the screw itself due to over-tightening of the screw.

Description

Technical Field

[0001] The present invention relates to the technical field of screw locking machines, in particular to an automatic screw locking device. Background Art

[0002] In industrial production, screw tightening is a common and critical process step, widely used in the assembly process of various products. However, traditional screw tightening operations often have some problems.

[0003] During the screw tightening process, due to the lack of accurate monitoring of the tightening degree, it is easy to overtighten the screws. Overtightening not only damages the screws themselves, but can also damage the screw holes and related components of the product, affecting the overall structural strength and stability of the product, and even reducing the product's service life and performance, significantly increasing production and maintenance costs. Therefore, corresponding improvements have been made to address this issue. Summary of the Invention

[0004] Based on the technical problems existing in the prior art, the present invention proposes an automatic screw locking device.

[0005] The present invention provides an automatic screw locking device, comprising a base plate, a conveying assembly and a lifting assembly provided on the base plate, a mounting cylinder provided on the lifting assembly, a gear transmission box fixed on the top of the mounting cylinder, a driving motor fixed on the top of the gear transmission box, an output shaft of the driving motor is fixedly connected to the input shaft of the gear transmission box, the output shaft of the gear transmission box is fixedly connected to a connector located inside the mounting cylinder, a slot is provided at the bottom of the connector, a detachable electric telescopic rod is inserted in the slot, a screwdriver head is installed on the output shaft of the electric telescopic rod, the conveying assembly is located below the mounting cylinder, and is used for conveying products for installing screws, a pressure detection module is fixed on one inner wall of the slot, the pressure detection module is used for real-time collection of pressure values when the screws are locked, a deformation amount collection module is also provided on the side position of the bottom of the mounting cylinder, the deformation amount collection module is used for real-time collection of deformation degrees when the screws are locked, a control module is also fixed on the top of the gear transmission box, the pressure value and deformation degree are comprehensively analyzed by the control module to generate an evaluation coefficient, and the evaluation coefficient is compared with a preset evaluation coefficient. The coefficient is compared with the reference threshold to determine whether the screw has been tightened, and the working state of the drive motor is controlled according to the comparison result; the products to be installed with screws are transported one by one to the bottom of the installation cylinder by the conveying component. When a product reaches the bottom of the installation cylinder, the conveying component stops conveying, and then the lifting component drives the installation cylinder to move downward to a predetermined position, and then the electric telescopic rod drives the screwdriver head to extend from the bottom end of the installation cylinder and move it into the screw hole of the product. Then the output shaft of the driving motor drives the connector and the electric telescopic rod to rotate through the gear transmission box, and at the same time the electric telescopic rod slowly extends, thereby tightening the screw into the screw hole. During the screw tightening process, the pressure detection module collects the pressure value when the screw is locked in real time, and the deformation acquisition module collects the deformation degree when the screw is locked in real time. The pressure value and deformation degree are comprehensively analyzed by the control module to generate an evaluation coefficient. The evaluation coefficient is compared with the pre-set evaluation coefficient reference threshold to determine whether the screw has been tightened, and the working state of the drive motor is controlled according to the comparison result, so as to avoid damage caused by excessive tightening of the screw.

[0006] Preferably, a mounting seat is provided at the side of the bottom end of the mounting cylinder, and a deformation acquisition module is fixed to the bottom of the mounting seat; in this way, the deformation degree of the top end of the screw can be clearly monitored through the deformation acquisition module during the process of tightening the screw.

[0007] Preferably, a fixing plate is fixed to the circumferential outer wall of the mounting cylinder, a first motor is fixed to the top of the fixing plate, the output shaft of the first motor is fixedly connected to a screw disk located below the fixing plate, the screw disk is provided with a plurality of holes for placing screws distributed in a circular array, a gap is provided between two adjacent holes for the electric telescopic rod of the screwdriver to pass through, and a space for the screw disk to move is provided on the mounting cylinder; in this way, a plurality of screws can be pre-placed into the corresponding holes, and then the output shaft of the first motor drives the screw disk to rotate so that a certain screw is exactly located below the screwdriver head, and then the electric telescopic rod is extended so that the screw is adsorbed onto the screwdriver head, and then the electric telescopic rod is reset upward, and then the first motor drives the screw disk to rotate according to the set angle so that the gap is located below the screwdriver head, so that it will not cause any obstruction to the electric telescopic rod extending downward to tighten the screw.

[0008] Preferably, the lifting assembly includes a longitudinal guide rail, which is fixed on the top of the base plate, a slider is slidably connected to the front of the longitudinal guide rail, the slider is fixedly sleeved on the mounting tube, a screw is rotatably connected inside the longitudinal guide rail, the screw is threadedly connected to the slider, a second motor is fixed to the top of the longitudinal guide rail, and the output shaft of the second motor is fixedly connected to the end of the screw; the output shaft of the second motor drives the screw to rotate, and the screw will drive the slider to move up and down along the length direction of the longitudinal guide rail, thereby controlling the lifting and lowering action of the mounting tube.

[0009] Preferably, the conveying component is a belt conveyor; thus, the product can be conveyed by the belt conveyor.

[0010] Preferably, the front end face of the belt conveyor is fixed with a fixed seat, the rear end face of the fixed seat is fixed with an electric push rod, the output shaft of the electric push rod is fixedly connected with the second positioning plate, and the rear end face of the belt conveyor is fixed with the first positioning plate, and the first positioning plate and the second positioning plate are relatively distributed; when the belt conveyor stops, the electric push rod is started, and the output shaft of the electric push rod drives the second positioning plate to move toward the first positioning plate, so that the product can be stabilized by the second positioning plate and the first positioning plate together, so that when tightening the screws, the product will not be deflected due to the action of torque.

[0011] Preferably, the calculation formula of the normalized pressure value when the screw is tightened is:

[0012]

[0013] in, Real-time collected screw locking pressure value (unit: N or MPa), Minimum range of pressure sensor, The maximum measuring range of the pressure sensor.

[0014] Preferably, the calculation formula for the normalized degree of deformation when the screw is tightened is:

[0015]

[0016] in, The deformation of the screw tip (such as pixel offset or shape difference) calculated by the image processing module, : The minimum deformation threshold allowed (such as pixels), : Maximum allowed deformation threshold (such as pixels);

[0017] Based on edge algorithm, deformation The calculation formula is:

[0018]

[0019] in, The grayscale matrix of the current frame image, : Preset screw top template image, Total number of pixels.

[0020] Preferably, the calculation formula of the evaluation coefficient is:

[0021]

[0022] in, Weight coefficient ( evaluation_coefficient (range [,]).

[0023] Preferably, the preset evaluation coefficient reference threshold is set to , the evaluation coefficient calculated by the control module and the pre-set evaluation coefficient reference threshold Perform a comparison to determine whether the screw has been tightened, and control the working state of the drive motor based on the comparison result. The specific judgment is as follows:

[0024] when When , it indicates that the screw is in a tightening state, and an early warning signal is generated. After receiving the early warning signal, a stop signal is generated and transmitted to , and tightening is stopped after receiving the stop signal;

[0025] when When , it indicates that the screw is not in the tightening state, and a normal signal is generated. After receiving the normal signal, a hold signal is generated and transmitted to , and after receiving the hold signal, tightening continues.

[0026] Compared with the prior art, the present invention provides an automatic screw locking device with the following beneficial effects:

[0027] 1. An automatic screw tightening device. This invention uses a pressure detection module to collect real-time screw tightening pressure, and a deformation acquisition module to collect real-time screw deformation. A control module then comprehensively analyzes these two key parameters to generate an evaluation coefficient. By comparing the evaluation coefficient with a pre-set reference threshold, it accurately determines whether the screw is tightened and controls the operating status of the drive motor accordingly. This effectively prevents damage to the product and the screw itself caused by overtightening, ensures the quality and stability of screw tightening, and reduces product defect rates and repair costs caused by screw tightening issues.

[0028] 2. An automatic screw-locking device. A mounting barrel is equipped with a screw disk with multiple holes and notches, into which multiple screws can be pre-placed. A first motor drives the screw disk to rotate, precisely positioning the screws directly under the screwdriver head, facilitating screw attachment by the electric telescopic rod. The screw disk then continues to rotate, positioning the notches below the screwdriver head without interfering with the electric telescopic rod's screw-locking operation. This structure enables rapid and accurate screw delivery, reduces the time and labor required for manual screw placement, and improves screw-locking efficiency.

[0029] 3. An automatic screw-tightening device uses a conveyor belt to transport the product. A first positioning plate and a second positioning plate driven by an electric actuator are installed on the belt conveyor. When the belt conveyor stops transporting the product, the electric actuator drives the second positioning plate toward the first positioning plate, which together stabilizes the product. This prevents the product from deflecting due to torque during the screw-tightening process, ensuring accurate screw-tightening positioning and improving product assembly quality.

[0030] 4. An automatic screw tightening device normalizes the pressure and deformation during screw tightening and provides a corresponding calculation formula, eliminating the influence of different detection parameter dimensions and ranges, making the parameters comparable. Furthermore, by comprehensively considering both pressure and deformation to calculate an evaluation coefficient, this method is more scientific and accurate than single-parameter judgments, providing a more comprehensive reflection of the screw tightening status and further improving the accuracy and reliability of screw tightening control. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the overall structure of an automatic screw locking device proposed by the present invention;

[0032] Figure 2 This is a schematic diagram of the lifting component structure of an automatic screw locking device proposed by the present invention;

[0033] Figure 3 This is a schematic diagram of the internal structure of the installation cylinder of an automatic screw locking device proposed by the present invention;

[0034] Figure 4 This is a schematic diagram of the installation structure between the connector and the screwdriver of an automatic screw locking device proposed by the present invention;

[0035] Figure 5 For the present invention Figure 3 A schematic diagram of the enlarged structure at point A;

[0036] Figure 6 This is a schematic diagram of the structure of a belt conveyor for an automatic screw locking device proposed by the present invention;

[0037] Figure 7 This is a schematic diagram of the principle of an automatic screw locking device proposed by the present invention.

[0038] In the figure: 1. Base plate; 2. Longitudinal guide rail; 3. Mounting cylinder; 4. Gear transmission box; 5. Drive motor; 6. Connector; 7. Electric telescopic rod; 8. Slot; 9. Pressure detection module; 10. Mounting seat; 11. Deformation acquisition module; 12. Fixing plate; 13. First motor; 14. Screw disk; 15. Notch; 16. Belt conveyor; 17. First positioning plate; 18. Fixing seat; 19. Electric push rod; 20. Second positioning plate; 21. Control module; 22. Slider; 23. Screw; 24. Second motor. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0040] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0041] Reference Figure 1-Figure 7, an automatic screw locking device, including a base plate 1, a conveying assembly and a lifting assembly are provided on the base plate 1, a mounting cylinder 3 is provided on the lifting assembly, a gear transmission box 4 is fixed to the top of the mounting cylinder 3, a driving motor 5 is fixed to the top of the gear transmission box 4, the output shaft of the driving motor 5 is fixedly connected to the input shaft of the gear transmission box 4, the output shaft of the gear transmission box 4 is fixedly connected to a connector 6 located inside the mounting cylinder 3, a slot 8 is provided at the bottom of the connector 6, a detachable electric telescopic rod 7 is inserted into the slot 8, and a screwdriver head is installed on the output shaft of the electric telescopic rod 7, the conveying assembly is located below the mounting cylinder 3, and is used to install screws The product is conveyed. A pressure detection module 9 is fixed to the inner wall of one side of the slot 8. The pressure detection module 9 is used to collect the pressure value when the screw is tightened in real time. A deformation acquisition module 11 is also provided at the side position of the bottom of the mounting cylinder 3. The deformation acquisition module 11 is used to collect the deformation degree of the screw in real time when the screw is tightened. A control module 21 is also fixed to the top of the gear transmission box 4. The control module 21 performs a comprehensive analysis of the pressure value and the deformation degree to generate an evaluation coefficient. The evaluation coefficient is compared with a preset evaluation coefficient reference threshold to determine whether the screw has been tightened. The working state of the drive motor 5 is controlled according to the comparison result.

[0042] It should be noted that the pressure detection module 9 may be a pressure sensor or other device capable of real-time acquisition of the pressure value during screw tightening, and the deformation acquisition module 11 may be an industrial camera or other device capable of real-time acquisition of the degree of deformation during screw tightening. Therefore, the pressure detection module 9 and the deformation acquisition module 11 are not specifically limited herein and may be selected according to actual needs.

[0043] It should be noted that the gear transmission box 4 mainly transmits the rotational kinetic energy transmitted by the drive motor 5 to the connector 6 through the cooperation of its internal gears. The specific cooperation method of the internal gears of the gear transmission box 4 is not specifically limited here and can be selected according to actual needs.

[0044] During operation, the products to be screwed are conveyed one by one to the bottom of the installation cylinder 3 by the conveying assembly. When a product reaches the bottom of the installation cylinder 3, the conveying assembly stops conveying, and then the lifting assembly drives the installation cylinder 3 to move downward to a predetermined position, and then the electric telescopic rod 7 drives the screwdriver head to extend from the bottom end of the installation cylinder 3 and move into the screw hole of the product, and then the output shaft of the driving motor 5 drives the connecting head 6 and the electric telescopic rod 7 to rotate through the gear transmission box 4. At the same time, the electric telescopic rod 7 slowly extends, thereby tightening the screw into the screw hole. During the screwing process, the pressure detection module 9 collects the pressure value when the screw is locked in real time, and the deformation amount collection module 11 collects the deformation degree when the screw is locked in real time. The pressure value and deformation degree are comprehensively analyzed by the control module 21 to generate an evaluation coefficient. The evaluation coefficient is compared with the preset evaluation coefficient reference threshold to determine whether the screw has been tightened, and the working state of the driving motor 5 is controlled according to the comparison result, so as to avoid damage caused by excessive tightening of the screw.

[0045] Among them, a mounting seat 10 is provided at the side of the bottom end of the mounting cylinder 3, and the deformation acquisition module 11 is fixed at the bottom of the mounting seat 10;

[0046] During operation, the deformation degree of the screw tip can be clearly monitored through the deformation amount acquisition module 11 during the process of tightening the screw.

[0047] Furthermore, a fixing plate 12 is fixed to the circumferential outer wall of the mounting tube 3, a first motor 13 is fixed to the top of the fixing plate 12, and the output shaft of the first motor 13 is fixedly connected to a screw disk 14 located below the fixing plate 12. The screw disk 14 is provided with a plurality of holes for placing screws distributed in a circular array, and a gap 15 for the electric telescopic rod 7 of the screwdriver to pass through is provided between two adjacent holes. A space for the screw disk 14 to move is opened on the mounting tube 3;

[0048] During operation, multiple screws can be pre-placed into the corresponding holes, and then the output shaft of the first motor 13 drives the screw disk 14 to rotate, so that a certain screw is exactly under the screwdriver head, and then the electric telescopic rod 7 is extended, so that the screw is adsorbed onto the screwdriver head, and then the electric telescopic rod 7 is reset upward, and then the first motor 13 drives the screw disk 14 to rotate according to the set angle, so that the notch 15 is located directly under the screwdriver head, so that there is no obstruction to the electric telescopic rod 7 extending downward to tighten the screw.

[0049] The lifting assembly includes a longitudinal guide rail 2, which is fixed to the top of the base plate 1. A slider 22 is slidably connected to the front of the longitudinal guide rail 2. The slider 22 is fixedly sleeved on the mounting tube 3. A screw 23 is rotatably connected inside the longitudinal guide rail 2. The screw 23 is threadedly connected to the slider 22. A second motor 24 is fixed to the top of the longitudinal guide rail 2. The output shaft of the second motor 24 is fixedly connected to the end of the screw 23.

[0050] During operation, the output shaft of the second motor 24 drives the screw 23 to rotate, and the screw 23 drives the slider 22 to move up and down along the length direction of the longitudinal guide rail 2, thereby controlling the lifting action of the installation cylinder 3.

[0051] Wherein, the conveying component is a belt conveyor 16;

[0052] During operation, the product can be transported by the belt conveyor 16 .

[0053] The front end of the belt conveyor 16 is fixed with a fixed seat 18, the rear end of the fixed seat 18 is fixed with an electric push rod 19, the output shaft of the electric push rod 19 is fixedly connected to the second positioning plate 20, and the rear end of the belt conveyor 16 is fixed with a first positioning plate 17, and the first positioning plate 17 and the second positioning plate 20 are arranged relative to each other;

[0054] During operation, when the belt conveyor 16 stops, the electric push rod 19 is started, and the output shaft of the electric push rod 19 drives the second positioning plate 20 to move toward the first positioning plate 17. In this way, the product can be stabilized by the second positioning plate 20 and the first positioning plate 17. In this way, when tightening the screws, the product will not be deflected due to the action of torque.

[0055] Existing equipment is prone to overtightening during the screw tightening process due to a lack of accurate monitoring of the tightening degree. Overtightening not only damages the screw itself, but can also damage the screw hole and related components of the product, affecting the overall structural strength and stability of the product, and even reducing its service life and performance, significantly increasing production and maintenance costs. The pressure detection module collects the pressure value during screw tightening in real time, and the deformation acquisition module collects the degree of deformation during screw tightening in real time. The control module comprehensively analyzes these two key parameters to generate an evaluation coefficient. By comparing the evaluation coefficient with a pre-set reference threshold, it accurately determines whether the screw is tightened and controls the operating status of the drive motor accordingly. This effectively prevents damage to the product and the screw itself caused by overtightening, ensures the quality and stability of screw tightening, and reduces product defectiveness and repair costs caused by screw tightening issues.

[0056] In this embodiment, the calculation formula of the normalized pressure value when the screw is tightened is:

[0057]

[0058] Further, Real-time collected screw locking pressure value (unit: N or MPa), Minimum range of pressure sensor, The maximum measuring range of the pressure sensor.

[0059] Among them, the calculation formula for the normalized deformation degree when the screw is tightened is:

[0060]

[0061] in, The deformation of the screw tip (such as pixel offset or shape difference) calculated by the image processing module, : The minimum deformation threshold allowed (such as 0 pixels), : Maximum allowed deformation threshold (e.g. 50 pixels);

[0062] Based on edge algorithm, deformation The calculation formula is:

[0063]

[0064] in, The grayscale matrix of the current frame image, : Preset screw top template image, Total number of pixels.

[0065] Furthermore, the calculation formula of the evaluation coefficient is:

[0066]

[0067] in, Weight coefficient ( Evaluation coefficient (range [0,1]).

[0068] Among them, the pre-set evaluation coefficient reference threshold is set to , the evaluation coefficient calculated by the control module 21 is and the pre-set evaluation coefficient reference threshold Perform a comparison to determine whether the screw has been tightened, and control the working state of the drive motor 5 according to the comparison result. The specific judgment is as follows:

[0069] when When , it indicates that the screw is in the tightening state, and an early warning signal is generated. After receiving the early warning signal, 21 generates a stop signal and transmits the stop signal to 05. After 05 receives the stop signal, tightening stops;

[0070] when When , it indicates that the screw is not in the tightening state, and a normal signal is generated. After 21 receives the normal signal, it generates a hold signal and transmits the hold signal to 05. After 05 receives the hold signal, it continues to tighten.

[0071] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An automatic screw locking device, comprising a base plate (1), characterized in that: The bottom plate (1) is provided with a conveying assembly and a lifting assembly, and the lifting assembly is provided with a mounting cylinder (3), a gear transmission box (4) is fixed to the top of the mounting cylinder (3), a driving motor (5) is fixed to the top of the gear transmission box (4), an output shaft of the driving motor (5) is fixedly connected to an input shaft of the gear transmission box (4), the output shaft of the gear transmission box (4) is fixedly connected to a connector (6) located inside the mounting cylinder (3), a slot (8) is provided at the bottom of the connector (6), a detachable electric telescopic rod (7) is inserted into the slot (8), and a screwdriver is installed on the output shaft of the electric telescopic rod (7) The conveying assembly is located below the installation cylinder (3) and is used to convey the product for installing the screws. A pressure detection module (9) is fixed to the inner wall of one side of the slot (8). The pressure detection module (9) is used to collect the pressure value when the screw is locked in real time. A deformation acquisition module (11) is also provided at the side position of the bottom of the installation cylinder (3). The deformation acquisition module (11) is used to collect the deformation degree when the screw is locked in real time. A control module (21) is also fixed to the top of the gear transmission box (4). The pressure value and the deformation degree are comprehensively analyzed by the control module (21) to generate an evaluation coefficient. and the pre-set evaluation coefficient reference threshold A comparison is performed to determine whether the screw has been tightened, and the working state of the drive motor (5) is controlled according to the comparison result. The specific judgment is as follows: when When the screw is tightened, it indicates that the screw is in a tightening state, and a warning signal is generated. After receiving the warning signal, the control module (21) generates a stop signal and transmits the stop signal to the drive motor (5). After receiving the stop signal, the drive motor (5) stops tightening; when When the screw is not in a tightening state, a normal signal is generated. After receiving the normal signal, the control module (21) generates a hold signal and transmits the hold signal to the drive motor (5). After receiving the hold signal, the drive motor (5) continues to tighten.

2. The automatic screw locking device according to claim 1, characterized in that: A mounting seat (10) is provided at a side position of the bottom end of the mounting cylinder (3), and a deformation amount acquisition module (11) is fixed to the bottom of the mounting seat (10).

3. The automatic screw locking device according to claim 1, characterized in that: A fixing plate (12) is fixed to the circumferential outer wall of the mounting cylinder (3), a first motor (13) is fixed to the top of the fixing plate (12), an output shaft of the first motor (13) is fixedly connected to a screw disk (14) located below the fixing plate (12), a plurality of holes for placing screws distributed in a circular array are provided on the screw disk (14), a notch (15) for the electric telescopic rod (7) of the screwdriver to pass through is provided between two adjacent holes, and a space for the screw disk (14) to move is provided on the mounting cylinder (3).

4. The automatic screw locking device according to claim 1, characterized in that: The lifting assembly comprises a longitudinal guide rail (2), the longitudinal guide rail (2) being fixed to the top of the base plate (1), a slider (22) being slidably connected to the front of the longitudinal guide rail (2), the slider (22) being fixedly sleeved on the mounting cylinder (3), a screw rod (23) being rotatably connected inside the longitudinal guide rail (2), the screw rod (23) being threadedly connected to the slider (22), a second motor (24) being fixed to the top of the longitudinal guide rail (2), and an output shaft of the second motor (24) being fixedly connected to the end of the screw rod (23).

5. The automatic screw locking device according to claim 1, characterized in that: The conveying component is a belt conveyor (16).

6. The automatic screw locking device according to claim 5, characterized in that: A fixing seat (18) is fixed to the front end face of the belt conveyor (16), an electric push rod (19) is fixed to the rear end face of the fixing seat (18), an output shaft of the electric push rod (19) is fixedly connected to a second positioning plate (20), and a first positioning plate (17) is fixed to the rear end face of the belt conveyor (16), and the first positioning plate (17) and the second positioning plate (20) are arranged relative to each other.

7. The automatic screw locking device according to claim 1, characterized in that: The calculation formula of the normalized pressure value when the screw is tightened is: in, Real-time collection of screw locking pressure values, Minimum range of pressure sensor, The maximum measuring range of the pressure sensor.

8. The automatic screw locking device according to claim 7, characterized in that: The calculation formula for the normalized degree of deformation during screw tightening is: in, The deformation of the screw tip calculated by the image processing module, : The minimum deformation threshold allowed, : Maximum allowed deformation threshold; Based on edge algorithm, deformation The calculation formula is: in, The grayscale matrix of the current frame image, : Preset screw top template image, Total number of pixels.

9. The automatic screw locking device according to claim 8, characterized in that: The calculation formula of the evaluation coefficient is: in, Weight coefficient Evaluation coefficient.

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