CN220455069U - Bolt welding strength detection device with nut - Google Patents

Abstract

The utility model provides a bolt welding strength detection device with a nut, which comprises: a frame; the clamping fixture is arranged on the frame and used for clamping and fixing the workpiece; the induction element is arranged on the clamping jig and used for detecting whether a nut arranged on the surface of the workpiece is screwed on the bolt or not; the push rod is horizontally arranged on one side of the clamping jig, is parallel to the radial direction of the nut on the workpiece and is used for horizontally pushing the nut on the workpiece; the power mechanism is fixedly arranged at one side of the clamping jig and used for driving the push rod to translate in the horizontal and vertical directions; a pressure sensor is arranged between one end of the push rod and the power mechanism, and the other end of the push rod extends towards the clamping jig. The utility model can efficiently and accurately detect the welding strength of the bolt with the nut on the premise of ensuring that the nut is screwed on the bolt.

Description

Bolt welding strength detection device with nut

Technical Field

The utility model relates to the technical field of detection, in particular to a bolt welding strength detection device with nuts.

Background

In the field of automobile welding, nuts are already installed on parts when workpieces are fed, the nuts are installed on bolts on the surfaces of the workpieces, but the nuts are not screwed, and the nuts are screwed on the bolts to realize welding with other parts when welding operation is performed. Because the work piece is supplied materials, the bolt is fixed on the surface of the work piece through the welding process, in order to ensure that the whole fastener has the fastening force meeting the design requirement on the surface of the work piece after the nuts and the bolts are screwed up, the screwed nuts and the bolts are required to be subjected to thrust test generally, namely, a certain thrust is given to the nuts, and the welding strength of the bolts on the work piece is judged by judging whether the whole body consisting of the bolts and the nuts falls off from the work piece or not, namely, the falling indicates that the welding strength does not reach the standard, and the falling indicates that the welding strength meets the requirement.

In the prior art, after nuts are screwed on bolts one by manual work through a wrench, thrust test is performed on the nuts screwed on the bolts, however, the number of nuts installed on workpieces is large, through batch screwing operation of the nuts, a manual screwing-missing phenomenon can exist, if the nuts and the bolts are not screwed, the problem occurs in assembly between the workpieces because the nuts and the bolts are not locked when the welding strength of the bolts meets the requirement in the subsequent thrust test process, and the problem occurs in assembly between the workpieces after the welding process of the workpieces.

Disclosure of Invention

In view of the above, the utility model provides a device for detecting the welding strength of a bolt with a nut, which can efficiently and accurately detect the welding strength of the bolt with the nut on the premise of ensuring that the nut is screwed on the bolt.

The technical scheme of the utility model is realized as follows:

the utility model provides a bolt welding strength detection device with a nut, which comprises:

a frame;

the clamping fixture is arranged on the frame and used for clamping and fixing the workpiece;

the induction element is arranged on the clamping jig and used for detecting whether a nut arranged on the surface of the workpiece is screwed on the bolt or not;

the push rod is horizontally arranged on one side of the clamping jig, is aligned with the radial direction of the nut on the workpiece, and is used for horizontally pushing the nut on the workpiece;

the power mechanism is fixedly arranged at one side of the clamping jig and used for driving the push rod to translate in the horizontal and vertical directions;

a pressure sensor is arranged between one end of the push rod and the power mechanism, and the other end of the push rod extends towards the clamping jig.

On the basis of the technical scheme, preferably, the clamping jig comprises a bracket, and a positioning profiling device, a first pressing device and a second pressing device which are fixedly arranged on the bracket, wherein the positioning profiling device is used for positioning a workpiece, the first pressing device and the second pressing device are respectively arranged at intervals along the length direction of the workpiece, the first pressing device is used for pressing the top surface of the workpiece, and the second pressing device is used for pressing the side surface of the workpiece.

Further, preferably, the sensing element is mounted on the bracket or the second pressing device corresponding to the position of the nut, and the sensing element is used for detecting whether a spanner is present at the positions of the nuts on the top surface and the side surface of the workpiece.

On the basis of the technical scheme, the turnover mechanism comprises turnover frames and turnover cylinders, the turnover frames are two, the two turnover frames are fixedly arranged on the frame at intervals, the bracket horizontally rotates and is arranged between the two turnover frames, the turnover cylinders are arranged between the power mechanism and the clamping jig, the fixed ends of the turnover cylinders are hinged with the inside of the frame, and the telescopic ends of the turnover cylinders extend out of the top of the frame and are hinged with one side of the bracket, which is close to the power mechanism.

Further, preferably, the bracket is provided with a through hole corresponding to the position of the bolt on the side face of the workpiece.

On the basis of the technical scheme, preferably, the power mechanism comprises a first linear module, a second linear module and a third linear module;

one end of the push rod, which is far away from the clamping jig, is connected with a third linear module through a pressure sensor, and the third linear module is used for driving the push rod to translate along the width direction of the workpiece;

the third linear module is horizontally arranged on the second linear module, and the second linear module is used for driving the second linear module to translate up and down in the vertical direction;

the second straight line module is vertical to be set up on first straight line module, and first straight line module level is fixed to be set up in the frame, and first straight line module is used for driving the push rod along work piece length direction translation.

Further, preferably, the device further comprises at least one stop device, wherein the stop device is fixedly arranged on the frame on the bottom surface of the bracket and is positioned on one side of the bracket, which is close to the overturning cylinder;

the stop device comprises a limit frame, a first limit piece and a second limit piece;

the limiting frame is vertically fixed on the top surface of the frame, the first limiting piece is fixedly arranged on the top surface of the bracket, and when the bracket is in a horizontal state, the first limiting frame is vertically abutted with the bottom surface of the bracket;

the second limiting piece is fixedly arranged on one side, far away from the overturning cylinder, of the limiting frame, and when the support is in a vertical state, the second limiting piece is vertically abutted with the bottom surface of the support.

Still further, preferably, the device further comprises a locking device, wherein the locking device comprises a fixing frame, a telescopic cylinder, a first locking piece and a second locking piece;

the first locking piece and the second locking piece are respectively and fixedly arranged at two sides of the bracket in the width direction, and locking holes are formed in the same side of the first locking piece and the second locking piece;

the fixing frame is fixedly arranged on the frame on one side of the width direction of the bracket, the telescopic cylinder is horizontally and fixedly arranged on the fixing frame, and the telescopic end of the telescopic cylinder is used for being respectively matched and connected with the locking holes on the first locking piece and the second locking piece.

Compared with the prior art, the utility model has the following beneficial effects:

(1) According to the bolt welding strength detection device with the nut, the clamping fixture is arranged, the workpiece with the nut can be clamped and fixed, the induction element is arranged on the clamping fixture, after the workpiece is installed on the clamping fixture, whether the spanner is positioned at the nut position or not can be detected through the induction element, so that whether the nut is screwed on the bolt or not is judged, the condition that the nut on the bolt is screwed before the detection of the welding strength is ensured, the phenomenon that the nut is not screwed is avoided, the push rod is driven to approach the nut on the workpiece through the power mechanism, the push rod is aligned with the radial direction of the nut on the workpiece, the push rod is used for exerting thrust on the side wall of the nut, the welding strength of the bolt on the workpiece is judged according to the numerical value of the pressure sensor, when the numerical value of the pressure sensor is gradually increased within a certain time, the nut and the bolt are not pushed off on the surface of the workpiece, the welding strength of the bolt is judged to be enough, and when the numerical value of the pressure sensor is gradually increased within a short time, the nut and the nut is instantaneously reset on the workpiece, the nut is judged to be insufficient, and the bolt is screwed on the workpiece, by the mode, the condition that the nut is ensured to be screwed on the workpiece, the nut is accurately detected, and the bolt is accurately detected;

(2) Through setting up tilting mechanism, can overturn clamping tool in horizontal and vertical direction to can realize that the screw rod of nut position department to work piece top surface and side can both effectually carry out welding strength detection, detection range is wider, and the suitability is stronger;

(3) By arranging the stop device, the clamping jig can always turn between a horizontal state and a vertical state in the turning process, so that the push rod can be parallel to the radial direction of the nut, and the reliability of bolt welding strength detection is improved;

(4) Through setting up locking means, can be after the clamping tool upset to level or vertical state, can guarantee that clamping tool position state is fixed, avoid taking place the clamping tool reverse upset under push rod thrust effect to guarantee that bolt welding strength detects stable and reliable's going on.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a structure of a bolt looseness detecting device disclosed by the utility model;

FIG. 2 is a schematic diagram of an assembly structure of the clamping fixture, the turnover mechanism and the locking device disclosed by the utility model;

FIG. 3 is a schematic view of a structure of the clamping fixture in a horizontal state;

fig. 4 is a schematic structural view of the clamping fixture in a vertical state;

FIG. 5 is a schematic view showing another construction of the bolt looseness detecting apparatus of the present utility model;

FIG. 6 is a schematic perspective view of a power mechanism according to the present disclosure;

reference numerals:

1. a frame; 2. clamping the jig; p, a workpiece; 3. a push rod; s, a nut; 4. a power mechanism; 21. a bracket; 22. positioning and profiling; 23. a first hold-down device; 24. a second hold-down device; 25. an inductive element; 5. a turnover mechanism; 51. a roll-over stand; 52. a turnover cylinder; 211. a through hole; 31. a pressure sensor; 41. a first linear module; 42. a second linear module; 43. a third linear module; 6. a stop device; 61. a limiting frame; 62. a first limiting member; 63. a second limiting piece; 7. a locking device; 71. a fixing frame; 72. a telescopic cylinder; 73. a first locking member; 74. a second locking member; l, locking hole.

Detailed Description

The following description of the embodiments of the present utility model will clearly and fully describe the technical aspects of the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, are intended to fall within the scope of the present utility model.

As shown in fig. 1, in combination with fig. 5, the utility model discloses a bolt welding strength detection device with nuts, which comprises a frame 1, a clamping jig 2, a push rod 3 and a power mechanism 4.

The clamping jig 2 is arranged on the frame 1 and is used for clamping and fixing a workpiece P, so that welding strength detection is conveniently carried out on a bolt provided with a nut S on the workpiece P. The nut S in this embodiment is mounted on the bolt of the workpiece P, and in the initial state, the nut and the bolt are not tightened when the workpiece is fed.

The induction element is arranged on the clamping jig and used for detecting whether a nut arranged on the surface of a workpiece is screwed on a bolt or not, specifically, after the workpiece is fixed through the clamping jig, the nut on the bolt is screwed by a spanner manually, and whether the nut is locked with the bolt or not is judged by judging whether the spanner is positioned at the position of the nut or not, and the induction element is remarkable in that the spanner is provided with torsion detection, namely, the induction element only needs to judge that the spanner exists at the position of the nut, namely, the fact that the nut is screwed on the bolt by the spanner manually is indicated.

The push rod 3 is horizontally arranged on one side of the clamping jig 2, the push rod 3 is aligned with the radial direction of the nut S on the workpiece P, and the push rod 3 is used for horizontally pushing the nut S on the workpiece P.

The power mechanism 4 is fixedly arranged on one side of the clamping jig 2 and used for driving the push rod 3 to translate in the horizontal and vertical directions. The nuts S are distributed at different positions on the workpiece P, and the nuts S are high and low, so that the positions of the push rod 3 relative to the nuts S can be adjusted through the power mechanism 4, and the push rod 3 can push all the nuts S on the workpiece P conveniently under the driving of the power mechanism 4.

A pressure sensor 31 is arranged between one end of the push rod 3 and the power mechanism 4, and the other end of the push rod 3 extends towards the clamping jig 2.

By adopting the technical scheme, the workpiece provided with the nut can be clamped and fixed by arranging the clamping jig, the inductive element is arranged on the clamping jig, and the inductive element is used for detecting whether the spanner is positioned at the nut position after the workpiece is arranged on the clamping jig, so that whether the nut is screwed on the bolt is judged, the nut on the bolt is in a screwing state before the welding strength detection of the bolt is ensured, and the nut is prevented from being leaked.

The push rod is driven to approach the nut on the workpiece through the power mechanism, the push rod is kept to be aligned with the radial direction of the nut on the workpiece, the push rod is used for applying thrust to the side wall of the nut, the welding strength of the bolt on the workpiece is judged according to the numerical value of the pressure sensor, when the numerical value of the pressure sensor is gradually increased within a certain time, the welding fastening force of the surface bolt is far greater than the thrust of the push rod, the nut and the bolt are not pushed off on the surface of the workpiece, the welding strength of the bolt is judged to be enough, when the numerical value of the pressure sensor is gradually increased within a short time, the numerical value is instantaneously reset, the welding fastening force of the bolt is far less than the thrust of the push rod, the nut and the bolt are pushed off on the workpiece, and the welding strength of the bolt is judged to be insufficient, and by the mode, the welding strength detection of the bolt with the nut can be realized efficiently and accurately on the premise that the nut is screwed on the bolt.

In order to achieve the clamping and fixing of the workpiece P, this embodiment shows a preferred embodiment of the clamping fixture 2, specifically, referring to fig. 2, the clamping fixture 2 includes a bracket 21, and a positioning profile 22, a first pressing device 23 and a second pressing device 24 that are fixedly disposed on the bracket 21.

The bracket 21, which is a base body of the clamping jig 2, may be provided as a pallet. The positioning profiling 22 is used for positioning the workpiece P, one or more positioning profiling 22 are arranged on the bracket 21 along the length direction of the workpiece P, and the positioning profiling 22 is matched with the contour of the workpiece P.

The first pressing device 23 and the second pressing device 24 are respectively arranged at intervals along the length direction of the workpiece P, the first pressing device 23 is used for pressing the top surface of the workpiece P, and the second pressing device 24 is used for pressing the side surface of the workpiece P.

The first pressing device 23 and the second pressing device 24 are all cylinder pressing structures, and the structures belong to conventional pressing structures in the prior art. By means of the cooperation of the first pressing means 23 and the second pressing means 24, a firm fixing of the workpiece P on the carrier 21 can be achieved.

As some preferred embodiments, a sensing element 25 is mounted on the bracket 21 or on the second pressing device 24 corresponding to the position of the nut S, and the sensing element is used for detecting whether a wrench is present at the position of the nut on the top and side surfaces of the workpiece. By adopting the structure, after the workpiece P is mounted on the clamping jig 2, whether the spanner is positioned at the nut position is detected through the sensing element 25, so that whether the nut is screwed down on the bolt is judged, the condition that the nut on the bolt is in a screwed down state before the welding strength detection is ensured, and the phenomenon of the nut is prevented from being leaked to be screwed down is avoided.

Preferably, the sensing element 25 is preferably a proximity switch or a position sensor.

As an implementation mode, when the top surface of the workpiece P is only provided with the nut S, and the radial direction of the nut S is parallel to the top surface of the workpiece P, the clamping jig 2 is horizontally and fixedly arranged on the frame 1, and the detection of the welding strength of the screw rods at all the nuts on the top surface of the workpiece P can be completed by matching the push rod 3 and the power mechanism 4.

However, on some workpieces P, nuts S are present on the top and side surfaces of the workpiece P, the top and side surfaces are perpendicular to each other, and the push rod 3 is always in a horizontal state, so that the welding strength of the screw at the nuts on the side surface of the workpiece P cannot be detected.

For this reason, in order to realize that the nut S on the side of the workpiece P can also be detected, the detection device of this embodiment further provides a turnover mechanism 5, as shown in fig. 2-5, the turnover mechanism 5 includes two turnover frames 51 and turnover cylinders 52, the two turnover frames 51 are fixedly disposed on the frame 1 at intervals, the bracket 21 is horizontally rotatably disposed between the two turnover frames 51, the turnover cylinders 52 are disposed between the power mechanism 4 and the clamping fixture 2, the fixed ends of the turnover cylinders 52 are hinged with the inside of the frame 1, and the telescopic ends of the turnover cylinders 52 extend out of the top of the frame 1 and are hinged with one side of the bracket 21 close to the power mechanism 4.

By the arrangement, the clamping jig 2 can be driven to overturn on the overturning frame 51 towards one side far away from the power mechanism 4 through the overturning cylinder 52, so that the clamping jig 2 is overturned from a horizontal state to a vertical state.

When the bracket 21 is turned to be in a vertical state, in order that the push rod 3 can push the nut S on the side surface of the workpiece P on the bracket 21, the through hole 211 corresponding to the bolt position on the side surface of the workpiece P is formed in the bracket 21, so that the push rod 3 is perpendicular to the bracket 21 and passes through the through hole 211 to realize detection of the welding strength of the screw at the nut.

As some embodiments, referring to fig. 6, the power mechanism 4 includes a first linear module 41, a second linear module 42, and a third linear module 43;

one end of the push rod 3 far away from the clamping jig 2 is connected with a third linear module 43 through a pressure sensor 31, and the third linear module 43 is used for driving the push rod 3 to translate along the width direction of the workpiece P;

the third linear module 43 is horizontally mounted on the second linear module 42, and the second linear module 42 is used for driving the second linear module 42 to translate up and down in the vertical direction;

the second linear module 42 is vertically disposed on the first linear module 41, the first linear module 41 is horizontally and fixedly disposed on the frame 1, and the first linear module 41 is used for driving the push rod 3 to translate along the length direction of the workpiece P.

The first linear module 41, the second linear module 42, and the third linear module 43 may be linear actuators such as a screw linear module, a pulley linear module, and the like.

In the above-mentioned turning device, the turning power source is the turning cylinder 52, in order to ensure that the clamping jig 2 can be turned between the horizontal and vertical states accurately, the embodiment further provides at least one stop device 6, where the stop device 6 is fixedly disposed on the frame 1 on the bottom surface of the bracket 21 and is located on one side of the bracket 21 near the turning cylinder 52.

The stopper 6 includes a stopper 61, a first stopper 62, and a second stopper 63.

The limiting frame 61 is vertically fixed on the top surface of the frame 1, the first limiting piece 62 is fixedly arranged on the top surface of the bracket 21, and when the bracket 21 is in a horizontal state, the first limiting frame 61 is vertically abutted with the bottom surface of the bracket 21.

The second limiting piece 63 is fixedly arranged on one side, far away from the overturning cylinder 52, of the limiting frame 61, and when the support is in a vertical state, the second limiting piece 63 vertically abuts against the bottom surface of the bracket 21.

By adopting the above technical scheme, when the bracket 21 is in a horizontal state, the first limiting frame 61 supports and limits the bottom surface of the bracket 21, and keeps the first limiting frame 61 vertical to the bracket 21. When the clamping jig 2 is turned from the horizontal state to the vertical state, the second limiting piece 63 vertically abuts against the bracket 21 in the horizontal direction, so that the clamping jig 2 is ensured to be turned and switched between 0 degrees and 90 degrees. The push rod 3 is guaranteed to be parallel to the radial direction of the nut S, and reliability of detection of the welding strength of the screw at the nut is improved.

When the bracket 21 is in a horizontal or vertical state, in order to avoid reverse overturning of the clamping jig 2 caused by thrust of the push rod 3, the detection device of the embodiment further comprises a locking device 7.

The locking device 7 comprises a fixed frame 71, a telescopic cylinder 72, a first locking piece 73 and a second locking piece 74;

the first locking member 73 and the second locking member 74 are fixedly disposed on both sides of the bracket 21 in the width direction, and the same side of the first locking member 73 and the second locking member 74 is provided with a locking hole L.

The fixing frame 71 is fixedly installed on the frame 1 on one side of the width direction of the bracket 21, the telescopic cylinder 72 is horizontally and fixedly arranged on the fixing frame 71, and the telescopic ends of the telescopic cylinder 72 are respectively matched and connected with the locking holes L on the first locking piece 73 and the second locking piece 74.

By adopting the above technical scheme, when the bracket 21 is in the horizontal state, the locking hole L on the first locking piece 73 is opposite to the telescopic end of the telescopic cylinder 72, at this time, the telescopic end of the telescopic cylinder 72 is inserted into the locking hole L, so that the clamping jig 2 is kept in the horizontal state and fixed in position, and the clamping jig 2 cannot turn over at this time.

When the bracket 21 is turned from the horizontal state to the vertical state, the second locking piece 74 is turned over to the telescopic cylinder 72, at this time, the locking hole L on the second locking piece 74 corresponds to the telescopic rod on the telescopic cylinder 72, and the telescopic end of the telescopic cylinder 72 is inserted into the locking hole L on the second locking piece 74, so that the clamping jig 2 is kept in the vertical state and fixed in position, and at this time, the clamping jig 2 cannot be turned over.

Through setting up locking means 7, can be after clamping tool 2 upset to level or vertical state, can guarantee that clamping tool 2 position state is fixed, avoid taking place clamping tool 2 reverse upset under push rod 3 thrust action to guarantee that the screw rod welding strength of nut department detects stable and reliable going on.

The working principle of the utility model is as follows:

through setting up clamping tool, can carry out the clamping with the work piece of installing the nut fixed, through setting up inductive element on clamping tool, can be after the work piece is installed clamping tool, detect the spanner through inductive element and be in nut position, thereby judge whether the nut is screwed up on the bolt, guarantee that the bolt is before welding strength detects, nut on the bolt is in the state of screwing up, avoid the nut to leak to twist the phenomenon emergence, drive the push rod towards the nut on the work piece through power unit and be close to keep push rod and the radial direction of nut on the work piece to align, apply thrust to the nut lateral wall through the push rod, and judge the welding strength of bolt on the work piece according to pressure sensor's numerical value, in the time of a certain numerical value increase gradually, then it is not pushed away at the work piece surface to show nut and bolt, and then judge that bolt welding strength is enough, after the numerical value increases gradually in a short time returns to zero, then indicate that nut and bolt are pushed down on the work piece, and then judge that bolt welding strength is not enough, through above-mentioned mode, can high-efficient accurate realization carries out welding strength detection to the bolt that has the nut.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims (8)

1. A bolt weld strength detection device with a nut, comprising:

a frame (1);

the clamping fixture (2) is arranged on the frame (1) and is used for clamping and fixing a workpiece (P);

the induction element (25) is arranged on the clamping jig (2) and is used for detecting whether a nut (S) arranged on the surface of the workpiece (P) is screwed on a bolt or not;

the push rod (3) is horizontally arranged on one side of the clamping jig (2), the push rod (3) is aligned with the radial direction of the nut (S) on the workpiece (P), and the push rod (3) is used for horizontally pushing the nut (S) on the workpiece (P);

the power mechanism (4) is fixedly arranged at one side of the clamping jig (2) and is used for driving the push rod (3) to translate in the horizontal and vertical directions;

a pressure sensor (31) is arranged between one end of the push rod (3) and the power mechanism (4), and the other end of the push rod (3) extends towards the clamping jig (2).

2. The apparatus for detecting the welding strength of a bolt with a nut according to claim 1, wherein: the clamping jig (2) comprises a bracket (21) and positioning profiling devices (22), first pressing devices (23) and second pressing devices (24) which are fixedly arranged on the bracket (21), wherein the positioning profiling devices (22) are used for positioning a workpiece (P), the first pressing devices (23) and the second pressing devices (24) are respectively arranged at intervals along the length direction of the workpiece (P), the first pressing devices (23) are used for pressing the top surface of the workpiece (P), and the second pressing devices (24) are used for pressing the side surface of the workpiece (P).

3. The apparatus for detecting the welding strength of a bolt with a nut according to claim 2, wherein: the sensing element (25) is arranged on the bracket (21) or a second pressing device (24) corresponding to the position of the nut (S), and is used for detecting whether a spanner is arranged at the positions of the nuts (S) on the top surface and the side surface of the workpiece (P).

4. The apparatus for detecting the welding strength of a bolt with a nut according to claim 3, wherein: still include tilting mechanism (5), tilting mechanism (5) are including roll-over stand (51) and upset cylinder (52), roll-over stand (51) are provided with two, and two roll-over stand (51) interval are fixed to be set up on frame (1), and bracket (21) level rotates to set up between two roll-over stand (51), and upset cylinder (52) set up between power unit (4) and clamping tool (2), and the stiff end and the inside hinge of frame (1) of upset cylinder (52) are connected, and the flexible end of upset cylinder (52) extends frame (1) top to be close to one side hinge of power unit (4) with bracket (21).

5. The apparatus for detecting the welding strength of a bolt with a nut according to claim 4, wherein: the bracket (21) is provided with a through hole (211) corresponding to the position of the side bolt of the workpiece (P).

6. The bolt welding strength detecting apparatus with nut as claimed in claim 3 or 5, wherein: the power mechanism (4) comprises a first linear module (41), a second linear module (42) and a third linear module (43);

one end of the push rod (3) far away from the clamping jig (2) is connected with a third linear module (43) through a pressure sensor (31), and the third linear module (43) is used for driving the push rod (3) to translate along the width direction of the workpiece (P);

the third linear module (43) is horizontally arranged on the second linear module (42), and the second linear module (42) is used for driving the second linear module (42) to translate up and down in the vertical direction;

the second linear module (42) is vertically arranged on the first linear module (41), the first linear module (41) is horizontally and fixedly arranged on the frame (1), and the first linear module (41) is used for driving the push rod (3) to translate along the length direction of the workpiece (P).

7. The apparatus for detecting the welding strength of a bolt with a nut according to claim 4, wherein: the device also comprises at least one stop device (6), wherein the stop device (6) is fixedly arranged on the frame (1) on the bottom surface of the bracket (21) and is positioned on one side of the bracket (21) close to the overturning cylinder (52);

the stop device (6) comprises a limit frame (61), a first limit piece (62) and a second limit piece (63);

the limiting frame (61) is vertically fixed on the top surface of the frame (1), the first limiting piece (62) is fixedly arranged on the top surface of the bracket (21), and when the bracket (21) is in a horizontal state, the first limiting frame (61) is vertically abutted with the bottom surface of the bracket (21);

the second limiting piece (63) is fixedly arranged on one side, far away from the overturning cylinder (52), of the limiting frame (61), and when the support is in a vertical state, the second limiting piece (63) is vertically abutted with the bottom surface of the bracket (21).

8. The apparatus for detecting the welding strength of a bolt with a nut according to claim 7, wherein: the device also comprises a locking device (7), wherein the locking device (7) comprises a fixed frame (71), a telescopic cylinder (72), a first locking piece (73) and a second locking piece (74);

the first locking piece (73) and the second locking piece (74) are respectively and fixedly arranged on two sides of the bracket (21) in the width direction, and locking holes (L) are formed in the same side of the first locking piece (73) and the second locking piece (74);

the fixing frame (71) is fixedly arranged on the frame (1) on one side of the width direction of the bracket (21), the telescopic cylinder (72) is horizontally and fixedly arranged on the fixing frame (71), and the telescopic end of the telescopic cylinder (72) is used for being respectively connected with the locking holes (L) on the first locking piece (73) and the second locking piece (74) in a matching mode.