CN108953321B

CN108953321B - Threaded fastening assembly and in-place detection method and system of threaded fastening piece

Info

Publication number: CN108953321B
Application number: CN201810490268.6A
Authority: CN
Inventors: 宗晓波; 陈岳云
Original assignee: Adient Engineering and IP GmbH
Current assignee: Yanfeng International Seating Systems Co Ltd
Priority date: 2018-05-21
Filing date: 2018-05-21
Publication date: 2020-05-01
Anticipated expiration: 2038-05-21
Also published as: CN108953321A

Abstract

The invention relates to an in-place detection method and system for a threaded fastener, wherein the method comprises the following steps: the threaded fastener is screwed with the butted threaded connecting hole to realize the fastening connection of two parts; before the screw connection, a salient point is arranged on the inner wall of the threaded connection hole; in the process of screwing connection, a rotation angle value of the threaded fastener from the salient point to a set torque is obtained; and comparing the obtained rotation angle value with a set value, and if the rotation angle value is smaller than the set value, indicating that the threaded fastener is not fastened and giving an alarm. According to the invention, the angle of the threaded fastener passing between the convex point and the set torque is obtained, whether the threaded fastener is fastened in place is judged according to the angle, the phenomenon that the threaded fastener is not fastened in place can be found in time, and an alarm prompt is given in time, so that the steps of manual inspection are omitted, the labor cost and the cost of a checking fixture are saved, and the automation degree is improved.

Description

Threaded fastening assembly and in-place detection method and system of threaded fastening piece

Technical Field

The invention relates to the field of mechanical structure connection detection, in particular to a threaded fastening assembly and an in-place detection method and system of a threaded fastening piece.

Background

Bolts are commonly used as a common connecting member to fasten two components together. As shown in fig. 1, the first component 11 and the second component 12 are fastened and connected by a bolt 13, and as shown in fig. 2, a screw connection hole 111 is provided in the first component 11, a through hole 121 is provided in the second component 12, the through hole 121 is aligned with the screw connection hole 111, the bolt 13 is inserted through the through hole 121 and screwed into the screw connection hole 111, a bushing 14 is further sleeved at the through hole 121, and the bolt 13 is inserted through the bushing 14 and screwed into the screw connection hole 111. As shown in fig. 3 and 4, the screw portion of the bolt 13 is engaged with the threaded connection hole 111, and a portion of the screw protrudes from the threaded connection hole 111, in the example shown in fig. 3 and 4, the bolt 13 is a stepped bolt, and a portion with a diameter larger than that of the screw is provided on the stepped bolt, and the portion is placed in the bushing 14, and after the bolt 13 is fastened in place, the bolt head of the bolt 13 is attached to the outer side of the bushing. In determining whether the bolt 13 is fastened in place, a set torque is usually adopted, and the bolt 13 is screwed to the set torque, that is, the bolt 13 is considered to be fastened in place. Referring to fig. 5, a torque graph during screwing of the bolt 13 is shown, in which a torque variation at a position a1 is generated by the bolt 13 just starting to be screwed into the screw coupling hole 111, and a torque at a position a2 is generated by the bolt 13 being screwed to a set torque, and fig. 5 shows a change in torque during fastening of the bolt in place.

However, during production and assembly, the threaded connection hole 111 of the first component 11 and the through hole 121 of the second component 12 are coaxially aligned, and as shown in fig. 6 and 7, when the threaded connection hole 111 and the through hole 121 are not coaxial, the bolt 13 is misaligned during screwing, even if the set torque is reached, a gap 15 is formed between the bolt 13 and the through hole 121, and the screw portion of the bolt 13 is not in-position with the threaded connection hole 111, so that the assembly is actually wrong, and the bolt 13 is in a state of not being in place, but the torque reaches the set torque, so that the phenomenon is not easily found during production and assembly. As shown in fig. 8, a torque graph in the process of screwing in the bolt not in position is shown, in which the torque variation at the position a1 is caused by the bolt 13 starting to be screwed into the screw connection hole 111, and the torque at the position A3 is caused by the bolt 13 being screwed into the set torque, and as shown in fig. 5, in the case of the bolt 13 being out of position, the set torque is achieved in advance, and the bolt 13 is not in position at this time, but the method of fastening the bolt according to the set torque cannot be found. The existing method is to carry out inspection by manpower, so that the labor cost and the inspection tool cost are increased.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, provides a method and a system for detecting the in-place of a threaded fastener, and solves the problems that the phenomenon that the deviation of a bolt cannot be found when the existing method for judging whether the bolt is fastened in place by setting the torque is not available, and the labor cost and the cost of a detection tool are increased due to manual inspection.

The technical scheme for realizing the purpose is as follows:

the invention provides a method for detecting the in-place of a threaded fastener, which comprises the following steps:

the threaded fastener is screwed with the butted threaded connecting hole to realize the fastening connection of two parts;

before the screw connection, a salient point is arranged on the inner wall of the threaded connection hole;

in the process of screwing connection, a rotation angle value of the threaded fastener from the salient point to a set torque is obtained; and

and comparing the obtained rotation angle value with a set value, and if the rotation angle value is smaller than the set value, indicating that the threaded fastener is not fastened and giving an alarm.

According to the invention, the salient point is arranged on the inner wall of the threaded connecting hole, the angle change of the bolt fastener can be detected when the threaded fastener touches the salient point, and the condition that the threaded fastener is screwed to the set torque is detected, so that the angle of the threaded fastener between the salient point and the set torque is obtained, whether the threaded fastener is fastened in place is judged according to the angle, the phenomenon that the threaded fastener is not fastened in place due to deviation caused by the fact that the hole sites of two parts are not coaxial can be found in time, the alarm prompt is carried out in time when the threaded fastener is found to be fastened in place, the step of manual inspection is omitted, the labor cost and the cost of a checking tool are saved, and the automation degree is improved.

The in-place detection method of the threaded fastener is further improved in that a salient point is arranged on the inner wall of the threaded connecting hole, and the method comprises the following steps:

and deforming the inner wall part of the threaded connecting hole to form a convex point which is arranged to protrude inwards from the inner wall surface.

The screw fastener in-place detection method of the invention is further improved in that the salient point is provided on one end side of the screw connection hole away from the insertion side of the screw fastener.

The in-place detection method of the threaded fastener is further improved in that when the threaded fastener is screwed with the butted threaded connecting hole, the threaded fastener is driven by an electric tool gun according to the set torque to perform screwing operation;

acquiring a torque curve chart of the electric tool gun in the driving process;

forming a first torque peak in the torque graph when the threaded fastener touches the bump;

forming a second torque peak in the torque profile when the threaded fastener is driven to a set torque;

calculating the rotation angle value by recording the number of revolutions of the power tool gun from the first torque peak to the second torque peak.

In the present invention, the set value is set in accordance with the rotation angle of the threaded fastener from the protruding point to the set torque in the fastened-in-place state.

The invention also provides an in-place detection system for a threaded fastener, comprising:

the salient point is arranged on the inner wall of the threaded connecting hole butted with the threaded fastener;

the acquisition unit is used for acquiring a rotation angle value from the salient point to a set torque in the screwing process of the threaded fastener and the threaded connecting hole; and

and the judging unit is connected with the acquisition unit and used for comparing the rotation angle value with the set value, and if the rotation angle value is smaller than the set value, the threaded fastener is not fastened and an alarm is given.

The in-place detection system of the threaded fastener of the present invention is further improved in that the inner wall portion of the threaded connection hole is deformed to form a convex point inwardly projecting from the inner wall surface.

The in-place detection system of the threaded fastener is further improved in that the salient point is arranged on one end side of the threaded connecting hole far away from the inserting side of the threaded fastener.

The in-place detection system of the threaded fastener is further improved in that the in-place detection system further comprises an electric tool gun connected with the acquisition unit, and the electric tool gun is used for driving the threaded fastener to perform screwing operation according to the set torque;

the acquisition unit is used for acquiring a torque curve chart of the electric tool gun in the driving process of the electric tool gun, recording the revolution of the electric tool gun between the salient point and the set torque, and further calculating to obtain the rotation angle value.

In a further improvement of the in-place detection system of the threaded fastener of the present invention, the set value is stored in the determination unit, and the set value is set in accordance with a rotation angle of the threaded fastener from the protruding point to the set torque in a fastened-in-place state.

The present invention also provides a threaded fastener assembly comprising:

a threaded fastener; and

the threaded fastener is connected with the threaded connecting hole in a butt joint mode, the threaded connecting hole is in threaded connection with the threaded fastener in order to achieve fastening connection of two parts, protruding points are arranged on the inner wall of the threaded connecting hole, and the protruding points touch the threaded fastener to generate torque change, so that whether the threaded fastener is in place or not can be detected.

Drawings

Fig. 1 is a schematic structural diagram of a prior art fastening device for fastening two components by using a threaded fastener.

Fig. 2 is a schematic exploded view of fig. 1.

Fig. 3 to 4 are schematic exploded views showing the screw fastening process of the threaded fastener shown in fig. 1.

FIG. 5 is a torque graph during a threading tightening process of the threaded fastener of the construction shown in FIG. 1.

Fig. 6 is a schematic view showing a state in which the threaded fastener of the structure shown in fig. 1 is not fastened in place when the holes of the two components are not coaxial in the screwing fastening process.

Fig. 7 is an enlarged partial view of the threaded fastener of fig. 6.

FIG. 8 is a torque graph during a threading tightening of a threaded fastener of the construction shown in FIG. 6.

FIG. 9 is a schematic structural diagram of two components fastened together by a threaded fastener according to the method and system for detecting the proper position of the threaded fastener of the present invention.

Fig. 10 is a partially enlarged schematic view at C1 in fig. 9.

Fig. 11 is a schematic view of an exploded structure as in fig. 9.

Fig. 12 is an elevation view of the threaded connection hole in the configuration of fig. 11.

Fig. 13 to 15 are schematic views showing an exploded structure in a process of threadedly fastening the threaded fastener of the structure shown in fig. 9.

FIG. 16 is a torque graph during threading fastening of a threaded fastener of the construction shown in FIG. 9.

Fig. 17 is a schematic structural view of the threaded fastener of fig. 9 in a state where the protruding points are touched to be fastened in place.

Fig. 18 is a schematic structural view of a threaded connection hole formed in a first component part according to the present invention.

Fig. 19 is a partially enlarged schematic view at C2 in fig. 18.

FIG. 20 is a schematic view of a fastening structure of the present invention in which two protruding points are formed on a threaded connection hole.

Fig. 21 is a partially enlarged schematic view at C3 in fig. 20.

Fig. 22 is a schematic view of the threaded fastener of fig. 21 omitted.

FIG. 23 is a front view of the threaded connection hole of FIG. 22.

Fig. 24 is a cross-sectional view of the structure shown in fig. 20.

FIG. 25 is a schematic view of a nut with a threaded connection hole according to the present invention.

Detailed Description

The invention is further described with reference to the following figures and specific examples.

Referring to fig. 9, the invention provides a threaded fastening assembly, and a method and a system for detecting the in-place of a threaded fastener, which are used for solving the problem that the deviation of the threaded fastener cannot be found when the threaded fastener is fastened in place by judging whether the threaded fastener is fastened in place by using a set torque in the prior art, and also solving the problem that the manual inspection has high cost. The invention can automatically identify the misassembly risk, timely find the condition that the threaded fastener is not fastened in place, and timely give an alarm to prompt, thereby improving the automation degree, reducing manual spot inspection, labor cost, tooling equipment investment and equipment cost. The method and system for detecting the in-place of the threaded fastener of the present invention will be described with reference to the accompanying drawings.

Referring to fig. 9, a schematic structural diagram of two parts fastened by the threaded fastener according to the method and system for detecting the in-place of the threaded fastener is shown. The system for detecting the presence of a threaded fastener of the present invention will now be described with reference to FIG. 9.

As shown in fig. 9, the system for detecting the fastening position of the threaded fastener of the present invention is used to detect whether the threaded fastener 31 is fastened in place, and the threaded fastener 31 is used to be screwed into the threaded connection hole 32 to achieve fastening of the first component part 21 and the second component part 22. As shown in fig. 10 and 11, the second component 22 is provided with a through hole 221, and in the example shown in fig. 10 and 11, the first component 21 is provided with the screw connection hole 32, but the detection system of the present invention is not limited to the screw connection hole 32 provided on the first component 21, and the screw connection hole 32 may be attached to the side of the first component 21 as a separate part. When the first component 21 and the second component 22 are fastened, the bushing 33 is fitted into the through hole 221, and the threaded fastener 31 is inserted through the bushing 33 and screwed into the threaded connection hole 32.

As shown in fig. 12, the in-place detection system of the present invention includes a protruding point 321, an acquisition unit, and a determination unit, wherein the protruding point 321 is disposed on an inner wall of the threaded connection hole 32 in butt joint with the threaded fastener 31, and a top of the protruding point 321 is disposed in the bolt connection hole 21, so that the threaded fastener 31 may touch the protruding point 321 when being screwed with the threaded connection hole 32; the acquisition unit is used for acquiring a rotation angle value from the convex point 321 to a set torque in the screwing process of the threaded fastener 31 and the threaded connection hole 32, specifically, as shown in fig. 13, a screw rod part of the threaded fastener 31 is screwed into the threaded connection hole 32 and is screwed with threads in the threaded connection hole 32 so that the screw rod can be screwed into the bolt connection hole 32; as shown in fig. 14, when the end surface of the threaded fastener 31 touches the convex point 321, the blocking of the convex point 321 may cause a certain change in the screwing process of the threaded fastener 31, and according to the change, it is known that the threaded fastener 31 reaches the convex point 321, and the rotation angle of the threaded fastener 31 is recorded or detected from the convex point 321; as shown in fig. 15, the rotation angle is recorded or detected until the threaded fastener 31 is fastened to the set torque, that is, the threaded fastener 31 is screwed to the set torque, and the acquisition unit of the present invention acquires the angle change generated when the threaded fastener 31 is screwed from the convex point 321 to the set torque, that is, the rotation angle value from the convex point 321 to the set torque; the judging unit is connected with the collecting unit and used for comparing the selected angle with the set value, and if the value of the rotation angle is smaller than the set value, the threaded fastener 31 is not fastened in place, so that alarm prompt is performed.

As shown in fig. 16, a torque graph during screwing fastening of the threaded fastener is shown, in which a torque change at the position F1 is generated in the state shown in fig. 13, that is, a torque slight change is generated when the threaded fastener 31 is screwed into the threaded connection hole 32; the torque change at the position F2 is caused by the state shown in fig. 14, i.e., the torque change is caused by the contact of the threaded fastener 31 with the convex point 321; the torque change at the position F3 is generated by the state shown in fig. 15, i.e., the torque change is generated when the threaded fastener 31 is screwed to the set torque. In this torque graph, it can be seen that the rotation angle of the threaded fastener 31 from the position F2 to the position F3 is X °. Preferably, a set value is stored in the determination unit in advance, and the set value is set according to the rotation angle of the threaded fastener 31 from the protruding point 231 to the set torque in the fastened state. Specifically, the extent of tightening of the threaded fastener 31 usually defines the amount of insertion of the threaded fastener 31, and the rotation angle required to satisfy the amount of insertion can be calculated from the amount of insertion and the diameter of the threaded fastener 31, and can be stored as a set value in the determination unit. Alternatively, the rotation angle of the protruding point 321 to the set torque in the fastened state of the threaded fastener 31 may be obtained experimentally and stored as the set value in the determination unit.

As a preferred embodiment of the present invention, as shown in fig. 12, 18 and 19, an inner wall portion of the screw-coupling hole 32 is deformed to form a convex point 321 inwardly protruded from the inner wall surface. Preferably, the convex point 321 is formed by the inward concave of the outer wall surface of the cylinder wall of the screw connection hole 32, so that a concave 322 is correspondingly formed on the outer wall surface. In the example shown in fig. 18 and 19, the screw coupling hole 32 is formed in the first component part 21, and the screw coupling hole 32 is formed in the first component part 21 by drawing. In the example shown in fig. 18 and 19, the bump 321 is provided at one place.

In another preferred embodiment, as shown in fig. 20 to 24, two protruding points 321 are provided, and the two protruding points 321 are located at the same cross section of the threaded connection hole 32, and both the protruding points 321 are formed by inwardly recessing the outer wall surface of the cylinder wall of the threaded connection hole 32, so that a recess 322 is correspondingly formed on the outer wall surface, and preferably, the two protruding points 321 are oppositely arranged. Of course, the number of the convex points 321 is not limited in the present invention, and the convex points 321 may be two or more, but it should be noted that the convex points 321 may obstruct the screwing operation of the threaded connection member 31, and it should be avoided that the excessive convex points 321 are provided to affect the screwing operation of the threaded connection member 31.

In another preferred embodiment, as shown in fig. 25, the screw connection hole 32 is formed in a nut 23, the first component 21 is provided with a hole through which the screw fastener 31 is inserted, the protruding point 321 of the present invention is provided on an inner wall surface of the nut 23, and the nut 23 is screwed with the screw fastener 31 to tightly connect the first component 21 and the second component 22. Preferably, the nut 23 is welded and fixed to the first component part 21.

Preferably, as shown in fig. 17, the protruding point 321 of the present invention is provided on one end side of the screw coupling hole 32 away from the insertion side of the bolt fastener 31. I.e., the protruding point 321 is provided at the outer end side of the screw coupling hole 32. After the end surface of the threaded fastener 31 touches the convex point 321, the end surface protrudes from the threaded connection hole 32. Of course, the location of the protruding point 321 is not limited thereto, and it can be located at any position of the inner wall of the threaded connection hole 32.

When the threaded fastener 31 is screwed to the set torque position, namely the position of the threaded fastener 31 indicated by the dotted line shown in fig. 17, the distance between the end surface of the threaded fastener 31 at the position of the convex point 321 and the set torque position is D, the insertion amount of the threaded fastener 31 is known, after the position where the convex point 321 is arranged is determined, the required distance D at the position where the convex point is arranged and the set torque position can be calculated according to the insertion amount, and the rotation angle of the threaded fastener 31 can be calculated as the set value according to the distance D and the diameter of the threaded fastener 31. Of course, after the rotation angle value of the threaded fastener 31 between the convex point 321 and the set torque is detected, the rotation angle value can be converted into a distance value between the convex point and the set torque position, the distance value is compared with the distance D, when the distance value is smaller than the distance D, it is indicated that the threaded fastener 31 is not fastened in place, and an alarm prompt is performed.

As another preferred embodiment of the present invention, the in-place detection system of the present invention further comprises an electric tool gun connected to the acquisition unit, wherein the electric tool gun is used for driving the threaded fastener 31 to perform a screwing operation according to a set torque; the acquisition unit is used for acquiring a torque curve chart of the electric tool gun in the driving process of the electric tool gun, recording the rotation number of the electric tool gun from the salient point 321 to the set torque, and further calculating to obtain a rotation angle value. Referring to fig. 16, the power tool gun is a bolt screwing tool, and the output shaft thereof is engaged with the end of the threaded fastener 31 and drives the threaded fastener 31 to rotate together, when the threaded fastener 31 encounters the raised point 321, the obstruction of the raised point 321 causes the power tool gun to encounter resistance that creates a torque spike, i.e., the first torque peak at position F2, when the power tool gun reaches the set torque, the bolt head of the threaded fastener 31 abuts the bushing to form another torque peak, namely a second torque wave peak at the position F3, the acquisition unit of the invention counts at the first torque wave peak until the second torque wave peak finishes counting, obtains the revolution number of the electric tool gun between the first torque wave peak and the second torque wave peak, this number of revolutions, i.e., the number of revolutions of the threaded fastener 31, and accordingly, a value of the rotational angle between the first torque peak and the second torque peak can be obtained.

Preferably, the collecting unit of the present invention may be a sensor mounted on the electric tool gun for sensing the torque of the electric tool gun in real time and forming a torque curve.

As still another preferred embodiment of the present invention, the judging unit may be connected to an alarm when the judging unit performs an alarm, the judging unit forms a trigger instruction when the judging unit needs to perform an alarm, the alarm performs an alarm according to the trigger instruction, and the alarm may select an audio alarm, a photoelectric alarm, or a vibration alarm.

The threaded fastener 31 of the present invention is shown in the drawings as a stepped bolt, but is not limited thereto, and the threaded fastener 31 may be any type of bolt, any kind of bolt, and it should be understood to include any type of threaded connection.

The screw fastener in-place detection system has the beneficial effects that:

the structure is simple, whether the threaded fastener is assembled in place or not is automatically identified through the identification angle of the electric tool gun, and the automation degree is improved;

the structure has high universality, and any threaded connection structure can be suitable;

when the threaded connecting hole is formed on the part, the operation of welding the nut on the part can be omitted, the number of parts is reduced, and the structural weight is reduced;

the automation degree is high, manual point inspection is omitted, and labor cost and tool input cost are reduced.

The method for detecting the presence of a threaded fastener according to the present invention will be described below.

The in-place detection method of the threaded fastener comprises the following steps:

as shown in fig. 9 to 12, the two

parts

21,22 are fastened by screwing the threaded fastener 31 into the butted threaded connection hole 32;

before the screw connection, a convex point 321 is arranged on the inner wall of the screw connection hole 32;

in the process of screwing connection, a rotation angle value of the threaded fastener 31 from the convex point 321 to a set torque is obtained; and

As a preferred embodiment of the present invention, a bump is disposed on an inner wall of the threaded connection hole, including:

as shown in fig. 12, an inner wall portion of the screw-coupling hole 32 is deformed to form a convex point 321 inwardly protruded from the inner wall surface.

Preferably, the convex point 321 is formed by the inward concave of the outer wall surface of the cylinder wall of the screw connection hole 32, so that a concave 322 is correspondingly formed on the outer wall surface. In the example shown in fig. 18 and 19, the screw coupling hole 32 is formed in the first component part 21, and the screw coupling hole 32 is formed in the first component part 21 by drawing. In the example shown in fig. 18 and 19, the bump 321 is provided at one place.

The threaded connection hole 32 of the present invention may be formed on the first component part 21, and a tapped hole is made in the first component part 21 to form the threaded connection hole 32. However, the present invention is not limited to the threaded connection hole 32 being provided on the first component 21, and the threaded connection hole 32 may be attached and fixed to the side of the first component 21 as a separate part. As shown in fig. 25, a screw coupling hole 32 is formed in a nut 23, a hole through which a screw 31 is inserted is opened in the first component 21, and a projection 321 according to the present invention is provided on an inner wall surface of the nut 23, and the first component 21 and the second component 22 are screwed and fastened by the nut 23 and the screw 31. Preferably, the nut 23 is welded and fixed to the first component part 21.

As another preferred embodiment of the present invention, as shown in fig. 13 and 14, a projection 321 is provided on one end side of the screw attachment hole 32 away from the insertion side of the screw fastener 31. Of course, the location of the protruding point 321 is not limited thereto, and it can be located at any position of the inner wall of the threaded connection hole 32.

In a further preferred embodiment of the present invention, when the threaded fastener 31 is screwed into the butted threaded connection hole 32, the threaded fastener is driven by the electric power tool gun according to a set torque to perform a screwing operation;

as shown in fig. 16, during driving, a torque profile of the electric tool gun is acquired;

as shown in fig. 14 and 15, when the threaded fastener 31 touches the convex point, a first torque peak is formed in the torque graph, and the torque value at the position F2;

when the driving threaded fastener 31 reaches the set torque, a second torque peak is formed in the torque graph, the torque value at the position F3;

the rotation angle value is calculated by recording the number of revolutions of the power tool gun from the first torque peak to the second torque peak.

The electric tool gun is a tool for screwing a bolt, an output shaft of the electric tool gun can be matched with the end head of the threaded fastener 31 and drives the threaded fastener 31 to rotate together, when the threaded fastener 31 meets the convex point 321, the convex point 321 is blocked so that the electric tool gun meets resistance to form a torque peak, namely a first torque peak at the position F2, when the electric tool gun reaches a set torque, a bolt head of the threaded fastener 31 is abutted against a lining to form another torque peak, namely a second torque peak at the position F3.

As still another preferred embodiment of the present invention, the set value is set according to the rotation angle of the threaded fastener 31 from the convex point 321 to the set torque in the fastened state. Specifically, the extent of tightening of the threaded fastener 31 usually defines the amount of insertion of the threaded fastener 31, and the rotation angle required to satisfy the amount of insertion can be calculated from the amount of insertion and the diameter of the threaded fastener 31, and can be set as a set value. Alternatively, the rotation angle of the protruding point 321 to the set torque in the fastened state of the threaded fastener 31 may be obtained experimentally and taken as the set value.

The following is a description of the screw fastening assembly provided by the present invention.

The invention also provides a threaded fastening assembly which is used for fastening and connecting two parts, can fasten and connect the two parts and has the function of detecting whether the threaded fastener is in place. The threaded fastening assembly of the present invention includes the threaded fastening member 31 and the threaded connection hole 32 in the above-mentioned system and method for detecting the in-place of the threaded fastening member, as shown in fig. 11, the threaded fastening member 31 has an external thread, the threaded connection hole 32 is adapted to the threaded fastening member 31 and can be screwed, and two components are fastened and connected by screwing the threaded connection hole 32 and the threaded fastening member 31, wherein the threaded connection hole 32 can be formed on one component, or can be a single part, attached to one component or fixed on one component. As shown in fig. 12, a protruding point 321 is provided on an inner wall of the threaded connection hole 32, and the protruding point 321 touches the threaded fastener 31 to generate a torque change, so as to detect whether the threaded fastener 31 is in place.

Specifically, when the threaded fastener 31 touches the protruding point 321, the torque changes, and the change of the angle of the bolt fastener is detected, and it is detected that the threaded fastener is screwed to the set torque, so that the angle of the threaded fastener between the protruding point and the set torque is obtained, whether the threaded fastener is fastened in place is judged according to the angle, and the phenomenon that the threaded fastener is not fastened in place due to deviation caused by the fact that the hole sites of the two parts are not coaxial can be found in time.

The specific structure and the principle of mutually matching and detecting whether the threaded fastener 31 and the threaded connecting hole 32 are fastened in place in the threaded fastening assembly of the present invention are the same as the specific structure and the principle of mutually matching and detecting whether the threaded fastener 31 and the threaded connecting hole 32 are fastened in place in the above-mentioned system and method for detecting in-place of the threaded fastener, and specific reference may be made to the above description, and details are not repeated herein. While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.

Claims

1. A method for detecting the in-place of a threaded fastener is characterized by comprising the following steps:

comparing the obtained rotation angle value with a set value, and if the rotation angle value is smaller than the set value, indicating that the threaded fastener is not fastened and giving an alarm;

when the threaded fastener is screwed with the butted threaded connecting hole, driving the threaded fastener to perform screwing operation by using an electric tool gun according to the set torque;

acquiring a torque curve chart of the electric tool gun in the driving process;

2. The method for detecting the in-place of a threaded fastener according to claim 1, wherein the step of providing a convex point on the inner wall of the threaded connection hole comprises:

3. The method of detecting the presence of a threaded fastener according to claim 1 or 2, wherein the projection is provided on an end side of the threaded connection hole which is away from an insertion side of the threaded fastener.

4. The method of detecting the in-place of a threaded fastener according to claim 1, wherein the set value is set in accordance with a rotation angle of the threaded fastener from the protruding point to the set torque in a fastened-in-place state.

5. An in-position detection system for a threaded fastener, to which the in-position detection method for a threaded fastener according to claim 1 is applied, comprising:

6. The system for detecting the presence of a threaded fastener as claimed in claim 5, wherein the inner wall portion of said threaded connection hole is deformed to form a projection projecting inwardly from the inner wall surface.

7. The system for detecting the presence of a threaded fastener according to claim 5 or 6, wherein said projection is provided on an end side of said threaded connection hole which is remote from the insertion side of said threaded fastener.

8. The system for detecting the in-place of a threaded fastener according to claim 5, further comprising a power tool gun connected to the pick-up unit, the power tool gun being used to drive the threaded fastener for a screwing operation in accordance with the set torque;

9. A threaded fastener assembly to which the method for detecting the presence of a threaded fastener according to claim 1 is applied, comprising:

a threaded fastener; and