Method for preventing wrong tightening of tightening device, tightening device, and assembly equipment

Abstract

The present invention discloses a method for preventing incorrect tightening of a tightening device, a tightening device, and assembly equipment, relating to the technical field of electric vehicles. The method comprises the following steps: while the tightening device is operating, obtaining real-time operating parameters of the tightening gun, the real-time operating parameters including real-time torque and corresponding real-time rotational stroke parameters; matching the real-time operating parameters with theoretical operating parameters corresponding to the current screw connection, the theoretical operating parameters including theoretical torque and corresponding theoretical rotational stroke parameters; and, if the matching is unsuccessful, determining that the tightening gun is operating incorrectly. The technical solution of the present invention is intended to promptly detect incorrect tightening operations, thereby improving work quality.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and in particular to a method for preventing incorrect tightening of a tightening device, a tightening device, and assembly equipment. Background Art

[0002] The rear subframe stabilizer bar and stabilizer bar joint are important components of the automobile chassis. They are defined as key tightening items and need to be tightened with servo tools. The rear stabilizer bar and stabilizer bar joint of each vehicle model are tightened at the same position. The opposite side distance and torque of the stabilizer bar and stabilizer bar joint bolts of each vehicle model are different. Two different servo tools are required on one side, and four servo tools are required on both sides to tighten. In addition to tightening the stabilizer bar and stabilizer bar joint, the current position also needs to tighten key parts such as the rear motor suspension. The current tightening requires switching tools back and forth, which adds too much non-value-added time and affects work efficiency.

[0003] To this end, in the prior art, different socket selectors are switched on the same servo tool, and the torque needs to be modified and switched at the same time. In this process, it is easy to only modify the socket to adapt to the mating distance without adapting the torque, resulting in misoperation and reduced work quality. Summary of the Invention

[0004] The main purpose of the present invention is to provide a method for preventing incorrect tightening of a tightening device, a tightening device, and an assembly device, aiming to promptly detect incorrect tightening operations and thus improve the work quality.

[0005] To achieve the above-mentioned object, the present invention provides a method for preventing incorrect tightening of a tightening device, wherein the tightening device includes a tightening gun and a sleeve detachably mounted on a rotating portion of the tightening gun, the sleeve being configured to be sleeved with a head portion of a screw-connected member. The method for preventing incorrect tightening of a tightening device includes the following steps:

[0006] When the tightening device is working, obtaining real-time working parameters of the tightening gun, wherein the real-time working parameters include real-time torque and corresponding real-time rotation stroke parameters;

[0007] Matching the real-time working parameters with theoretical working parameters corresponding to the current screw connection, wherein the theoretical working parameters include theoretical torque and corresponding theoretical rotation stroke parameters;

[0008] When the matching is unsuccessful, it is determined that the tightening gun is malfunctioning.

[0009] In one embodiment, the step of matching the real-time operating parameters with theoretical operating parameters corresponding to the current screw connection comprises:

[0010] The real-time working parameters are matched with a theoretical working curve of the current screw connection when tightening, wherein the theoretical working curve is a corresponding relationship curve between theoretical torque and theoretical rotation stroke parameters.

[0011] In one embodiment, when the tightening device is working, the step of obtaining real-time working parameters of the tightening gun, wherein the real-time working parameters include real-time torque and corresponding real-time rotation stroke parameters, comprises:

[0012] When the real-time torque parameter of the tightening gun reaches the initial torque parameter of the current screw-connected part during tightening, the real-time working parameter of the tightening gun is acquired.

[0013] In one embodiment, when the real-time torque parameter of the tightening gun reaches the initial torque parameter of the current screw connection during tightening, obtaining the real-time working parameter of the tightening gun includes:

[0014] The ratio of the initial torque parameter of the current screw connection when tightening to the target torque parameter of the current screw connection when tightening is 20%-80%.

[0015] In one embodiment, the initial torque parameter of the current screw connection during tightening accounts for 20%-80% of the target torque parameter of the current screw connection during tightening, including:

[0016] Get the current screw connection strength form;

[0017] If it is a soft connection, the ratio of the initial torque parameter of the current screw connection when tightening to the target torque parameter of the current screw connection when tightening is 60%-80%;

[0018] If it is a neutral connection, the ratio of the initial torque parameter of the current screw connection when tightening to the target torque parameter of the current screw connection when tightening is 40%-60%; and,

[0019] If it is a hard connection, the ratio of the initial torque parameter of the current screw connection when tightening to the target torque parameter of the current screw connection when tightening is 20%-40%.

[0020] In one embodiment, the real-time operating parameters are matched with theoretical operating parameters corresponding to the current screw connection, wherein the theoretical operating parameters include theoretical torque and corresponding theoretical rotation stroke parameters, including:

[0021] A deviation value is obtained by comparing the real-time working parameter with a theoretical working parameter corresponding to the current screw connection, and the deviation value is matched with an allowable error value.

[0022] In one embodiment, when the matching is unsuccessful, determining that the tightening gun is malfunctioning includes:

[0023] After determining that the tightening gun is malfunctioning, the tightening gun stops working; and / or,

[0024] After determining that the tightening gun is malfunctioning, an alarm is issued; and / or,

[0025] After determining that the tightening gun is malfunctioning, vibrating; and / or,

[0026] After determining that the tightening gun is malfunctioning, light is emitted.

[0027] The present invention also provides a tightening device, comprising:

[0028] Tighten the gun;

[0029] a sleeve, detachably mounted on the rotating portion of the tightening gun, the sleeve being used to be sleeved with the head of the screw-connector; and

[0030] a control device electrically connected to the tightening gun;

[0031] The control device includes a memory, a processor, and a control program for the tightening device stored in the memory and executable on the processor. The control program for the tightening device is configured to implement the steps of the method for preventing wrong tightening of the tightening device.

[0032] In one embodiment, the sleeve is provided in plurality, and the plurality of sleeves at least includes:

[0033] A first sleeve includes a first mounting portion and a first working portion connected to each other, wherein the first mounting portion is detachably mounted on the rotating portion of the tightening gun, and the first working portion is configured to be sleeved on the head of the first screw member; and

[0034] The second sleeve includes a second mounting portion and a second working portion connected to each other, wherein the second mounting portion

[0035] The second working part is detachably mounted on the first working part and is configured to be sleeved on the head of the second screw connector; wherein,

[0036] The head of the first screw connection member and the head of the second screw connection member are arranged differently.

[0037] The present invention also provides an assembly device comprising the tightening device.

[0038] The technical solution of the present invention realizes precise control of the tightening process by real-time monitoring and comparison of the working parameters of the tightening gun with the theoretical parameters, which not only improves the tightening accuracy and assembly quality, but also reduces the failure rate and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0040] Figure 1 A schematic flow chart of an embodiment of a method for preventing wrong tightening of a tightening device provided by the present invention;

[0041] Figure 2 A schematic diagram of the hardware operating environment of the control device;

[0042] Description of Figure Numbers:

[0043] Processor 1001 , communication bus 1002 , user interface 1003 , network interface 1004 , memory 1005 .

[0044] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0046] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0047] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0048] The rear subframe stabilizer bar and stabilizer bar joint are important components of the automobile chassis. They are defined as key tightening items and need to be tightened with servo tools. The rear stabilizer bar and stabilizer bar joint of each vehicle model are tightened at the same position. The opposite side distance and torque of the stabilizer bar and stabilizer bar joint bolts of each vehicle model are different. Two different servo tools are required on one side, and four servo tools are required on both sides to tighten. In addition to tightening the stabilizer bar and stabilizer bar joint, the current position also needs to tighten key parts such as the rear motor suspension. The current tightening requires switching tools back and forth, which adds too much non-value-added time and affects work efficiency.

[0049] To this end, in the prior art, different socket selectors are switched on the same servo tool, and the torque needs to be modified and switched at the same time. In this process, it is easy to only modify the socket to adapt to the mating distance without adapting the torque, resulting in misoperation and reduced work quality.

[0050] The present invention provides a tightening device, including a tightening gun, a sleeve, a control device,

[0051] a sleeve, detachably mounted on the rotating portion of the tightening gun, the sleeve being used to be sleeved with the head of the screw-connector; and

[0052] a control device electrically connected to the tightening gun;

[0053] Wherein, the control device includes a memory, a processor and a control program of the tightening device stored in the memory and operable on the processor, and the control program of the tightening device is configured to implement the steps of the method for preventing wrong tightening of the tightening device, such as Figure 1 As shown, the following steps are included:

[0054] Step S100: When the tightening device is working, obtaining real-time working parameters of the tightening gun, wherein the real-time working parameters include real-time torque and corresponding real-time rotation stroke parameters;

[0055] Step S200, matching the real-time working parameters with theoretical working parameters corresponding to the current screw connection, wherein the theoretical working parameters include theoretical torque and corresponding theoretical rotation stroke parameters;

[0056] Step S300: When the matching is unsuccessful, it is determined that the tightening gun is malfunctioning.

[0057] In one embodiment, the step of matching the real-time operating parameters with theoretical operating parameters corresponding to the current screw connection comprises:

[0058] The real-time working parameters are matched with a theoretical working curve of the current screw connection when tightening, wherein the theoretical working curve is a corresponding relationship curve between theoretical torque and theoretical rotation stroke parameters.

[0059] In one embodiment, when the tightening device is working, the step of obtaining real-time working parameters of the tightening gun, wherein the real-time working parameters include real-time torque and corresponding real-time rotation stroke parameters, comprises:

[0060] When the real-time torque parameter of the tightening gun reaches the initial torque parameter of the current screw-connected part during tightening, the real-time working parameter of the tightening gun is acquired.

[0061] In one embodiment, when the real-time torque parameter of the tightening gun reaches the initial torque parameter of the current screw connection during tightening, obtaining the real-time working parameter of the tightening gun includes:

[0062] The ratio of the initial torque parameter of the current screw connection when tightening to the target torque parameter of the current screw connection when tightening is 20%-80%.

[0063] In one embodiment, the initial torque parameter of the current screw connection during tightening accounts for 20%-80% of the target torque parameter of the current screw connection during tightening, including:

[0064] Get the current screw connection strength form;

[0065] If it is a soft connection, the ratio of the initial torque parameter of the current screw connection when tightening to the target torque parameter of the current screw connection when tightening is 60%-80%;

[0066] If it is a neutral connection, the ratio of the initial torque parameter of the current screw connection when tightening to the target torque parameter of the current screw connection when tightening is 40%-60%; and,

[0067] If it is a hard connection, the ratio of the initial torque parameter of the current screw connection when tightening to the target torque parameter of the current screw connection when tightening is 20%-40%.

[0068] In one embodiment, the real-time operating parameters are matched with theoretical operating parameters corresponding to the current screw connection, wherein the theoretical operating parameters include theoretical torque and corresponding theoretical rotation stroke parameters, including:

[0069] A deviation value is obtained by comparing the real-time working parameter with a theoretical working parameter corresponding to the current screw connection, and the deviation value is matched with an allowable error value.

[0070] In one embodiment, when the matching is unsuccessful, determining that the tightening gun is malfunctioning includes:

[0071] After determining that the tightening gun is malfunctioning, the tightening gun stops working; and / or,

[0072] After determining that the tightening gun is malfunctioning, an alarm is issued; and / or,

[0073] After determining that the tightening gun is malfunctioning, vibrating; and / or,

[0074] After determining that the tightening gun is malfunctioning, light is emitted.

[0075] like Figure 2 As shown, the control device of the tightening device may include: a processor 1001, such as a central processing unit, a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen and an input unit such as a keyboard. Optionally, the user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface. The memory 1005 may be a high-speed random access memory or a stable non-volatile memory (NVM), such as a disk storage. The memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0076] Those skilled in the art will understand that Figure 2 The structure shown in the figure does not constitute a limitation on the control device of the tightening device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0077] In one embodiment, the sleeve is provided in plurality, and the plurality of sleeves at least includes:

[0078] A first sleeve includes a first mounting portion and a first working portion connected to each other, wherein the first mounting portion is detachably mounted on the rotating portion of the tightening gun, and the first working portion is configured to be sleeved on the head of the first screw member; and

[0079] The second sleeve includes a second mounting portion and a second working portion connected to each other, wherein the second mounting portion

[0080] The second working part is detachably mounted on the first working part and is configured to be sleeved on the head of the second screw connector; wherein the head of the first screw connector and the head of the second screw connector are configured differently.

[0081] With this arrangement, the first and second screw heads are of different types. The first working portion adapts to the first screw head, ensuring a stable grip during operation, effectively applying rotational force. The second mounting portion allows for a removable connection to the first working portion of the first sleeve, rather than directly connecting to the tightening gun. This allows the second sleeve to function as an accessory or extension to the first sleeve, providing additional functionality or flexibility. The second working portion mates with the second screw head. Furthermore, this removable connection facilitates quick replacement.

[0082] It is understandable that the detachable connection method can be set to a snap connection, a threaded connection, and a magnetic connection, which will not be elaborated here.

[0083] The present invention also proposes an assembly device, which includes: the specific structure of the tightening device refers to the above embodiment; since the assembly device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0084] The present invention also provides a method for preventing wrong tightening of a tightening device, comprising the following steps:

[0085] Step S100: When the tightening device is working, obtaining real-time working parameters of the tightening gun, wherein the real-time working parameters include real-time torque and corresponding real-time rotation stroke parameters;

[0086] Step S200, matching the real-time working parameters with theoretical working parameters corresponding to the current screw connection, wherein the theoretical working parameters include theoretical torque and corresponding theoretical rotation stroke parameters;

[0087] Step S300: When the matching is unsuccessful, it is determined that the tightening gun is malfunctioning.

[0088] The technical solution of the present invention realizes precise control of the tightening process by real-time monitoring and comparison of the working parameters of the tightening gun with the theoretical parameters, which not only improves the tightening accuracy and assembly quality, but also reduces the failure rate and maintenance costs.

[0089] It is understandable that the theoretical parameters can be obtained by testing the real-time parameters multiple times in advance and fitting the multiple real-time parameters.

[0090] In one embodiment, the step of matching the real-time operating parameters with theoretical operating parameters corresponding to the current screw connection comprises:

[0091] The real-time working parameters are matched with a theoretical working curve of the current screw connection when tightening, wherein the theoretical working curve is a corresponding relationship curve between theoretical torque and theoretical rotation stroke parameters.

[0092] With this setup, during the tightening process, sensors or other monitoring devices collect real-time torque and rotational travel data from the tightening gun. This data constitutes the real-time operating parameters. Based on the specifications, materials, and application scenarios of the current screw connection, the ideal relationship between torque and rotational travel is determined in advance through experiments or calculations, forming a theoretical operating curve. This curve describes how torque varies with rotational travel from the start of tightening to the final achievement of the predetermined torque value. The real-time torque and rotational travel data points are mapped onto the theoretical operating curve, or compared with the theoretical operating curve. This provides a more comprehensive and accurate reflection of the changes in torque and rotational travel during the tightening process, thereby improving the quality of the tightening operation.

[0093] In one embodiment, when the tightening device is working, the step of obtaining real-time working parameters of the tightening gun, wherein the real-time working parameters include real-time torque and corresponding real-time rotation stroke parameters, comprises:

[0094] When the real-time torque parameter of the tightening gun reaches the initial torque parameter of the current screw-connected part during tightening, the real-time working parameter of the tightening gun is acquired.

[0095] With this setup, when the real-time torque value reaches or exceeds the preset initial torque parameter, the data acquisition system is triggered to begin recording detailed real-time operating parameters. This ensures that data collection and analysis begins only after the screw connection has truly entered the effective tightening phase, thus avoiding interference from invalid data.

[0096] Specifically, in one embodiment, when the real-time torque parameter of the tightening gun reaches the initial torque parameter of the current screw connection during tightening, obtaining the real-time working parameter of the tightening gun includes:

[0097] The ratio of the initial torque parameter of the current screw connection when tightening to the target torque parameter of the current screw connection when tightening is 20%-80%.

[0098] With this setting, the collected data is more concentrated in the effective tightening stage, which is conducive to subsequent data analysis.

[0099] In one embodiment, the initial torque parameter of the current screw connection during tightening accounts for 20%-80% of the target torque parameter of the current screw connection during tightening, including:

[0100] Get the current screw connection strength form;

[0101] If it is a soft connection, the ratio of the initial torque parameter of the current screw connection when tightening to the target torque parameter of the current screw connection when tightening is 60%-80%;

[0102] If it is a neutral connection, the ratio of the initial torque parameter of the current screw connection when tightening to the target torque parameter of the current screw connection when tightening is 40%-60%; and,

[0103] If it is a hard connection, the ratio of the initial torque parameter of the current screw connection when tightening to the target torque parameter of the current screw connection when tightening is 20%-40%.

[0104] With this setting, since the soft connection requires high precision control during the tightening process, the ratio of the initial torque parameter to the target torque parameter is relatively high, usually between 60% and 80%. This means that during the tightening process, when the real-time torque reaches 60%-80% of the target torque, the real-time working parameters will be recorded. The tightening process of the neutral connection is relatively moderate, so the ratio of the initial torque parameter to the target torque parameter is between 40% and 60%. This ratio can make the tightening process more stable and reliable. Since the hard connection requires a higher clamping force and load-bearing capacity, the ratio of the initial torque parameter to the target torque parameter is relatively low, usually between 20% and 40%. This means that during the tightening process, the system will start recording the real-time working parameters when the real-time torque reaches a lower proportion of the target torque to ensure the adequacy and completeness of the tightening process.

[0105] In summary, by introducing the concept of connection strength and setting a reasonable ratio of the initial torque parameter to the target torque parameter according to different connection forms, this embodiment can more accurately control the tightening process and improve the accuracy and reliability of tightening.

[0106] In one embodiment, the real-time operating parameters are matched with theoretical operating parameters corresponding to the current screw connection, wherein the theoretical operating parameters include theoretical torque and corresponding theoretical rotation stroke parameters, including:

[0107] A deviation value is obtained by comparing the real-time working parameter with a theoretical working parameter corresponding to the current screw connection, and the deviation value is matched with an allowable error value.

[0108] With this setup, the real-time operating parameters are compared with the theoretical operating parameters corresponding to the current screw connection to determine a deviation value. The deviation value refers to the degree of difference between the real-time operating parameters and the theoretical operating parameters. It is a threshold value that can be pre-set based on factors such as the application scenario and connection requirements of the screw connection to determine whether the difference between the real-time operating parameters and the theoretical operating parameters is within an acceptable range. The calculated deviation value is compared with the allowable error value. If the deviation value is within the allowable error value range, the tightening process of the screw connection is considered to meet the design requirements and is acceptable. If the deviation value exceeds the allowable error value range, it is considered that there is a problem with the tightening process of the screw connection, and the tightening gun is determined to be malfunctioning.

[0109] In one embodiment, when the matching is unsuccessful, determining that the tightening gun is malfunctioning includes:

[0110] After determining that the tightening gun is malfunctioning, the tightening gun stops working.

[0111] It is understandable that by stopping the tightening gun from working, damage to screwed parts, degradation of assembly quality or safety hazards caused by incorrect tightening can be prevented, so that the tightening operation will not continue before the problem is solved.

[0112] In one embodiment, when the matching is unsuccessful, determining that the tightening gun is malfunctioning includes: after determining that the tightening gun is malfunctioning, issuing an alarm.

[0113] It is understandable that the operator can be reminded of the erroneous operation of the tightening gun by sounding an alarm, which is helpful for the operator to know that the tightening gun is erroneous.

[0114] In one embodiment, when the matching is unsuccessful, determining that the tightening gun is malfunctioning includes:

[0115] After determining that the tightening gun is malfunctioning, vibration is emitted.

[0116] It is understood that the vibration signal can be directly transmitted to the operator's hand or body, allowing the operator to immediately perceive the problem during the tightening process. This vibration reminder method is intuitive and quick, which is conducive to notifying the operator of the tightening gun malfunction.

[0117] In one embodiment, when the matching is unsuccessful, determining that the tightening gun is malfunctioning includes:

[0118] After determining that the tightening gun is malfunctioning, light is emitted.

[0119] It is understandable that a specific color of light (such as red) is emitted by an LED lamp or other light source to attract the operator's attention. This light reminder method is particularly effective in a dim or noisy environment and helps the operator to know that the tightening gun is malfunctioning.

[0120] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by utilizing the contents of the present invention's description and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A method for preventing wrong tightening of a tightening device, characterized in that: The tightening device includes a tightening gun and a sleeve detachably mounted on a rotating portion of the tightening gun, the sleeve being used to be sleeved with a head of a screw-connected member. The method for preventing incorrect tightening of the tightening device includes the following steps: When the tightening device is working, a current connection strength of the screw connection is obtained, a ratio of an initial torque parameter of the screw connection during tightening to a target torque parameter of the screw connection during tightening is within a preset range corresponding to the current connection strength, and real-time operating parameters of the tightening gun are obtained, the real-time operating parameters including a real-time torque and a corresponding real-time rotation stroke parameter; Matching the real-time working parameters with theoretical working parameters corresponding to the current screw connection, wherein the theoretical working parameters include theoretical torque and corresponding theoretical rotation stroke parameters; When the matching is unsuccessful, it is determined that the tightening gun is malfunctioning; Among them, the forms of connection strength include soft connection, neutral connection and hard connection. The preset range corresponding to the soft connection is greater than or equal to 60% and less than or equal to 80%, the preset range corresponding to the neutral connection is greater than or equal to 40% and less than or equal to 60%, and the preset range corresponding to the hard connection is greater than or equal to 20% and less than or equal to 40%.

2. The method for preventing wrong tightening of a tightening device according to claim 1, wherein: The step of matching the real-time working parameters with the theoretical working parameters corresponding to the current screw connection comprises: The real-time working parameters are matched with a theoretical working curve of the current screw connection when tightening, wherein the theoretical working curve is a corresponding relationship curve between theoretical torque and theoretical rotation stroke parameters.

3. The method for preventing wrong tightening of a tightening device according to claim 1 or 2, characterized in that: The real-time working parameters are matched with the theoretical working parameters corresponding to the current screw connection, wherein the theoretical working parameters include theoretical torque and corresponding theoretical rotation stroke parameters, including: A deviation value is obtained by comparing the real-time working parameter with a theoretical working parameter corresponding to the current screw connection, and the deviation value is matched with an allowable error value.

4. The method for preventing wrong tightening of a tightening device according to claim 1 or 2, characterized in that: When the matching is unsuccessful, it is determined that the tightening gun is malfunctioning, including: After determining that the tightening gun is malfunctioning, the tightening gun stops working; and / or, After determining that the tightening gun is malfunctioning, an alarm is issued; and / or, After determining that the tightening gun is malfunctioning, vibrating; and / or, After determining that the tightening gun is malfunctioning, light is emitted.

5. A tightening device, characterized in that: include: Tighten the gun; A sleeve is detachably mounted on the rotating portion of the tightening gun, and the sleeve is used to be sleeved with the head of the screw-connector; as well as, a control device electrically connected to the tightening gun; Wherein, the control device includes a memory, a processor and a control program of the tightening device stored in the memory and executable on the processor, and the control program of the tightening device is configured to implement the steps of the method for preventing wrong tightening of the tightening device as described in any one of claims 1 to 4.

6. The tightening device according to claim 5, characterized in that The sleeve is provided in plurality, and the plurality of sleeves at least includes: A first sleeve includes a first mounting portion and a first working portion connected to each other, wherein the first mounting portion is detachably mounted on the rotating portion of the tightening gun, and the first working portion is configured to be sleeved on the head of the first screw member; and The second sleeve includes a second mounting portion and a second working portion connected to each other, wherein the second mounting portion The second working part is detachably mounted on the first working part and is configured to be sleeved on the head of the second screw connector; wherein, The head of the first screw connection member and the head of the second screw connection member are arranged differently.

7. An assembly device, characterized in that: Comprising the tightening device according to any one of claims 5 and 6.

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