Pre-tightening axial force measuring device for installed bolt

Abstract

The utility model belongs to the technical field of mechanical part assembly, and discloses a pre-tightening axial force measuring device for an installed bolt. The device comprises a tensioner and a displacement detection piece, and the tensioner can be connected to a to-be-measured piece and a power source; the displacement detection piece is arranged on any side of the stretcher, and the displacement detection piece is used for detecting the displacement stretching distance of the to-be-measured piece; the tensioner is configured to be capable of stretching the to-be-measured piece, and stopping stretching and providing a stretching force value when the displacement detection piece detects that the to-be-measured piece has a sudden displacement change. According to the pre-tightening axial force measuring device for the installed bolt, the pre-tightening axial force of the assembled bolt can be measured, the measuring precision is high, and the reliability and the consistency of the assembled bolt are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical parts assembly, in particular to a pre-tightening axial force measuring device for installed bolts. Background Art

[0002] During the assembly of mechanical devices such as gearboxes, hydraulic tensioners are often used to tighten bolts to ensure they meet design requirements. Specifically, a hydraulic source is used to tighten and secure the bolts to the assembled nuts. The bolts are stretched to a preset length under hydraulic pressure, and then the bolts inside the hydraulic tensioner are twisted through a reserved opening to tighten the bolts to the assembled nuts.

[0003] However, the aforementioned bolt and nut tightening and assembly process is uncontrollable, making it impossible to determine whether the preload force of the bolts meets the design requirements after installation. As a result, the tightening forces of multiple bolts installed on the same assembly plane often differ, resulting in uneven stress distribution on that plane, causing sealing and consistency issues, such as gearbox oil leakage. Therefore, in the prior art, when tightening and assembling gearboxes using hydraulic tensioners, the same bolt needs to be stretched multiple times to ensure that the stretching distance meets the standard and the preload force of each bolt is the same, which results in low production efficiency.

[0004] Therefore, there is an urgent need for a pre-tightening axial force measuring device for installed bolts to solve the above technical problems. Utility Model Content

[0005] The purpose of the utility model is to provide a pre-tightening axial force measuring device for installed bolts, which can measure the pre-tightening axial force of the assembly bolts with high measurement accuracy, thereby improving the reliability and consistency of the assembly bolts.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] Axial preload force measurement device for installed bolts, comprising:

[0008] A stretcher, the stretcher being connectable to the workpiece to be measured and the stretcher being connectable to a power source;

[0009] A displacement detection member, which is provided on either side of the stretcher and is used to detect the displacement and stretching distance of the workpiece to be measured;

[0010] The stretcher is configured to stretch the workpiece to be measured, and stop stretching and provide a stretching force value when the displacement detection component detects a sudden displacement change of the workpiece to be measured.

[0011] Optionally, the stretcher comprises a housing and a stretching member, the stretching member is arranged in the housing and can be connected with the measured member to drive the measured member to stretch.

[0012] Optionally, the displacement detection member is detachably connected to the housing or the assembly end face of the measured member, and the displacement detection member is used to detect displacement change of the measured member.

[0013] The displacement detection member is detachably connected to the stretching member or the measured member, and the displacement detection member is used to detect displacement change of the stretching member or the measured member.

[0014] Optionally, the displacement detection member is detachably connected to the housing or the assembly end face, and the displacement detection member is arranged opposite to the assembly nut of the measured member to detect displacement change of the assembly nut.

[0015] The displacement detection member is detachably connected to the housing or the assembly end face, and the measured member is provided with a detection piece, and the displacement detection member is arranged opposite to the detection piece to detect displacement change of the detection piece.

[0016] Optionally, the detection piece is fixedly arranged on the assembly bolt of the measured member, or the detection piece is fixedly arranged on the end face of the assembly nut, or the detection piece is arranged perpendicularly to the outer periphery of the assembly nut.

[0017] Optionally, the displacement detection member is detachably connected to the stretching member or the measured member, and the displacement detection member is arranged opposite to the assembly end face of the measured member to detect relative displacement change between the stretching member and the assembly end face or between the measured member and the assembly end face.

[0018] The displacement detection member is detachably connected to the stretching member or the measured member, and the displacement detection member is arranged opposite to any side wall of the housing along the movement direction of the stretching member to detect relative displacement change between the stretching member and any side wall of the housing along the movement direction of the stretching member or between the measured member and any side wall of the housing along the movement direction of the stretching member.

[0019] Optionally, one end of the displacement detection member away from the detection end is provided with a fixing seat, and the fixing seat is detachably connected to any side of the stretcher.

[0020] Optionally, the fixing seat and the stretcher are magnetically connected, threadedly connected, limitingly connected or clamped.

[0021] Optionally, the fixing surface of the fixing base is provided with a plurality of magnetic attraction members, and the magnetic attraction members are magnetically connected to the stretcher, so that the fixing base and the stretcher are magnetically connected.

[0022] Optionally, a controller is further included, the power source and the displacement detection member are electrically connected to the controller, the controller is used for controlling and receiving the measurement information of the displacement detection member, and is used for controlling the opening or closing of the power source.

[0023] The beneficial effects of the utility model are as follows:

[0024] The utility model provides a kind of pre-tightening axial force measuring device for bolt that has been installed, by being set on the stretcher of the measured piece, the stretching of the measured piece can be realized, and the displacement change condition of the measured piece is detected by displacement detection member;So that when the pre-tightening axial force of the measured piece is measured, stretching piece constantly applies stretching force to the measured piece, until displacement detection member detects that the displacement of the measured piece mutates, the stretching force value at this time is the pre-tightening axial force of the measured piece. Through the accurate measurement of the pre-tightening axial force of the measured piece of installation, the measured piece can be measured after installation, avoid the product quality problem caused by bad assembly or the inconsistency of the pre-tightening axial force of each measured piece of the same assembly end surface, improve the assembly reliability of the measured piece and the consistency of the measured piece of the same assembly end surface. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is the first kind of structural schematic diagram of pre-tightening axial force measuring device for bolt that the utility model embodiment one provides;

[0026] Figure 2 It is the second kind of structural schematic diagram of pre-tightening axial force measuring device for bolt that the utility model embodiment one provides;

[0027] Figure 3 It is the third kind of structural schematic diagram of pre-tightening axial force measuring device for bolt that the utility model embodiment one provides;

[0028] Figure 4 It is the fourth kind of structural schematic diagram of pre-tightening axial force measuring device for bolt that the utility model embodiment one provides;

[0029] Figure 5 It is the fifth kind of structural schematic diagram of pre-tightening axial force measuring device for bolt that the utility model embodiment one provides;

[0030] Figure 6 It is the sixth kind of structural schematic diagram of pre-tightening axial force measuring device for bolt that the utility model embodiment one provides;

[0031] Figure 7 is the seventh structural schematic view of the pre-tightening axial force measuring device for the installed bolt provided by the embodiment one of the present application;

[0032] Figure 8 is the eighth structural schematic view of the pre-tightening axial force measuring device for the installed bolt provided by the embodiment one of the present application;

[0033] Figure 9 is the first structural schematic view of the pre-tightening axial force measuring device for the installed bolt provided by the embodiment two of the present application;

[0034] Figure 10 is the second structural schematic view of the pre-tightening axial force measuring device for the installed bolt provided by the embodiment two of the present application.

[0035] In the drawing:

[0036] 10, stretcher; 11, shell; 12, stretching piece;

[0037] 21, displacement detection piece; 22, fixed seat;

[0038] 200, to-be-measured piece; 210, assembly bolt; 220, assembly nut; 300, assembly end face; 400, detection sheet. DETAILED DESCRIPTION

[0039] The present application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, and not to limit the present application. In addition, it should be noted that, in order to facilitate the description, only the parts related to the present application are shown in the drawings, not all the structures.

[0040] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] In the utility model, unless another definite provision and limitation, first feature is in second feature "on" or "under" can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but contact through other feature between them. Moreover, first feature is in second feature "on", "above" and "upper surface" includes that first feature is in second feature directly above and obliquely above, or only indicates that first feature horizontal height is higher than second feature. First feature is in second feature "under", "below" and "under" includes that first feature is in second feature directly below and obliquely below, or only indicates that first feature horizontal height is less than second feature.

[0042] In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like, orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0043] The following refers to Figures 1 to 10 The pre-tightening axial force measuring device for the installed bolt provided by the utility model is described.

[0044] Embodiment one

[0045] Please refer to Figures 1 to 8 The utility model provides a kind of pre-tightening axial force measuring device for installed bolt, it includes stretcher 10 and displacement detection piece 21, stretcher 10 can be connected to the measured piece 200, stretcher 10 can be connected to power source;Displacement detection piece 21 is arranged in either side of stretcher 10, displacement detection piece 21 is used to detect the displacement stretching distance of measured piece 200;Stretcher 10 is configured to be able to stretch measured piece 200, and stop stretching and provide stretching force value when displacement detection piece 21 detects that measured piece 200 occurs displacement mutation.

[0046] It needs to be explained that the measured piece 200 described above includes the assembly bolt 210 and assembly nut 220 which have been installed.

[0047] The pre-tightening axial force measuring device for the installed bolt in the embodiment can realize the stretching of the to-be-measured piece 200 by being arranged on the stretcher 10, and the displacement change of the to-be-measured piece 200 can be detected by the displacement detecting piece 21; so that when the pre-tightening axial force of the to-be-measured piece 200 is measured, the stretching piece 12 continuously applies the stretching force to the to-be-measured piece 200 until the displacement detecting piece 21 detects that the displacement of the to-be-measured piece 200 changes suddenly, and the stretching force value at this time is the pre-tightening axial force of the to-be-measured piece 200. Through the accurate measurement of the pre-tightening axial force of the to-be-measured piece 200, the to-be-measured piece 200 can be measured after the installation is completed, and the product quality problem caused by the poor assembly or the inconsistency of the pre-tightening axial force of each to-be-measured piece 200 of the same assembly end surface 300 is avoided, and the assembly reliability of the to-be-measured piece 200 and the consistency of the to-be-measured piece 200 of the same assembly end surface 300 are improved.

[0048] Optionally, the power source can be a hydraulic source, which has the advantages of high flexibility, high efficiency, high smoothness, and wide application range.

[0049] Optionally, the displacement detecting piece 21 is a displacement sensor, which has the advantages of good smoothness, excellent resolution, good wear resistance, long service life, and high reliability.

[0050] Specifically, the stretcher 10 includes a shell 11 and a stretching piece 12, the stretching piece 12 is arranged in the shell 11 and can be connected with the to-be-measured piece 200 to drive the to-be-measured piece 200 to stretch. In use, the stretching piece 12 can move linearly along the shell 11 by the driving of the power source, so as to apply the stretching force to the to-be-measured piece 200, and the stretching of the to-be-measured piece 200 can be realized when the stretching force is not less than the pre-tightening axial force of the to-be-measured piece 200.

[0051] Further, the displacement detecting piece 21 in the embodiment can be detachably connected to the shell 11 or the assembly end surface 300 of the to-be-measured piece 200, and the displacement detecting piece 21 is used to detect the displacement change of the to-be-measured piece 200; that is, the displacement detecting piece 21 is installed on the relatively fixed structure and will not have a large displacement, so that the displacement change of the to-be-measured piece 200 can be obtained by detecting the movement of the structure of the to-be-measured piece 200.

[0052] Please refer to Figure 1 and Figure 2 In some optional embodiments, the displacement detecting piece 21 can be detachably connected to the shell 11 or the assembly end surface 300, and the displacement detecting piece 21 is arranged opposite to the assembly nut 220 of the to-be-measured piece 200 to detect the displacement change of the assembly nut 220. That is, the displacement change of the to-be-measured piece 200 can be obtained by detecting the displacement change of the assembly nut 220, so as to realize the displacement change detection function of the displacement detecting piece 21.

[0053] Please refer to Figures 3 to 8 In some other optional embodiments, the displacement detecting member 21 is detachably connected to the shell 11 or the assembly end face 300, and the detection piece 400 is arranged on the measured member 200, and the displacement detecting member 21 is arranged opposite to the detection piece 400 to detect the displacement change of the detection piece 400. That is, the displacement change of the measured member 200 can be obtained by detecting the displacement change of the detection piece 400, so as to realize the displacement change detection function of the displacement detecting member 21.

[0054] As shown in Figure 3 and Figure 4 , specifically, the detection piece 400 is fixedly arranged on the assembly bolt 210 of the measured member 200, and the detection piece 400 is fixedly connected with the assembly bolt 210, so that the displacement of the detection piece 400 is equivalent to the displacement of the assembly bolt 210 in the measured member 200, thereby realizing the detection of the displacement change of the measured member 200 by the displacement detecting member 21 through the detection of the displacement change of the detection piece 400.

[0055] Alternatively, as shown in Figure 5 and Figure 6 , the detection piece 400 is fixedly arranged on the end face of the assembly nut 220; in this way, the detection piece 400 is parallel and fixed with the assembly nut 220, and the displacement of the detection piece 400 is equivalent to the displacement of the assembly nut 220 in the measured member 200, thereby realizing the detection of the displacement change of the measured member 200 by the displacement detecting member 21 through the detection of the displacement change of the detection piece 400.

[0056] Alternatively, as shown in Figure 7 and Figure 8 , the detection piece 400 is arranged perpendicularly on the outer periphery of the assembly nut 220; in this way, the detection piece 400 is fixedly connected with the assembly nut 220, and the plane of the detection piece 400 is parallel to the end face of the assembly nut 220, so that the displacement of the detection piece 400 is equivalent to the displacement of the assembly nut 220 in the measured member 200, thereby realizing the detection of the displacement change of the measured member 200 by the displacement detecting member 21 through the detection of the displacement change of the detection piece 400.

[0057] Of course, the detection piece 400 is arranged to extend out of the stretcher 10, and a through hole is arranged on the corresponding tool, and the through hole extends through along the movement direction of the measured member 200, so as to avoid the movement interference between the detection piece 400 and the corresponding tool.

[0058] It can be understood that the displacement detection piece 21 is arranged on the top of the corresponding detection end (including the assembly nut 220 and the detection sheet 400). In other embodiments, the displacement detection piece 21 can also be arranged on the bottom of the corresponding detection end (including the assembly nut 220 and the detection sheet 400), and the displacement change of the measured piece 200 can also be detected.

[0059] Of course, in other embodiments, the object detected by the displacement detection piece 21 can also be adapted according to actual needs, which is not limited here.

[0060] Please refer to Figures 1 to 8 Further, one end of the displacement detection piece 21 away from the detection end is provided with a fixing seat 22, and the fixing seat 22 is detachably connected with any side of the stretcher 10. The fixing seat 22 is arranged for bearing the displacement detection piece 21 and for connecting with the stretcher 10.

[0061] Optionally, the fixing seat 22 and the stretcher 10 are magnetically connected, threadedly connected, limitingly connected or clamped. The above connection modes can realize the detachable connection between the stretcher 10 and the displacement detection piece 21. For example, the two are magnetically connected in the embodiment, which is convenient for disassembly and assembly.

[0062] Specifically, the fixing surface of the fixing seat 22 is provided with a plurality of magnetic attraction pieces, and the magnetic attraction pieces are magnetically connected to the stretcher 10 to realize the magnetic connection between the fixing seat 22 and the stretcher 10.

[0063] Correspondingly, the shell 11 or the stretching piece 12 of the stretcher 10 is a ferromagnetic material to realize the attraction of the two. Optionally, the magnetism of the stretcher 10 and the magnetism of the magnetic attraction piece of the fixing seat 22 are opposite, so that the stretcher 10 can be attracted to the magnetic attraction piece.

[0064] Specifically, the fixing seat 22 also has a mounting surface, and the mounting surface is provided with a fixing groove for mounting the displacement detection piece 21. Optionally, the displacement detection piece 21 and the fixing groove are fixedly connected by interference fit, clamping or the like, which is not limited here.

[0065] In the embodiment, the pre-tightening axial force measuring device for the installed bolt further comprises a controller, and the power source and the displacement detection piece 21 are electrically connected to the controller. The controller is used for controlling and receiving the measurement information of the displacement detection piece 21, and for controlling the opening or closing of the power source. In use, the controller controls the power source to drive the stretcher 10 to apply a stretching force to the measured piece 200, and at the same time, the displacement detection piece 21 is turned on for measurement. Until the displacement detection piece 21 detects a displacement mutation and sends a corresponding electrical signal to the controller, the controller obtains the signal and controls the power source to be turned off and obtains the signal of the stretching force of the stretcher 10, so that the pre-tightening axial force of the measured piece 200 can be obtained.

[0066] It can be understood that the controller can adopt a digital operation electronic system such as a PLC (Programmable Logic Controller) to perform the above control and signal receiving, which is a common knowledge and will not be described here.

[0067] Since the hydraulic oil in the oil cylinder of the stretcher 10 will generate heat during use, the working efficiency of the stretcher 10 will be reduced, the energy loss will be increased, and the service life of the stretcher 10 will be affected. Therefore, in the embodiment, the pretightening axial force measuring device for the installed bolt further comprises a temperature detection member and a pressure detection member, both of which are arranged in the oil cylinder of the stretcher 10 to detect the temperature of the hydraulic oil, so as to realize real-time monitoring of the temperature of the hydraulic oil and the pressure of the hydraulic oil, and avoid the influence of high oil temperature and high oil pressure on the service life of the stretcher 10.

[0068] Further, the pretightening axial force measuring device for the installed bolt is further provided with a cooling structure arranged at the hydraulic oil supply pipeline to cool the hydraulic oil.

[0069] It can be understood that the cooling structure can be a semiconductor cooling structure, a radiator, a liquid cooling structure, etc., which can realize heat exchange and cooling of the hydraulic oil, and will not be specifically limited here.

[0070] Embodiment Two

[0071] The embodiment provides a pretightening axial force measuring device for an installed bolt, and the difference between the embodiment and embodiment one is that the installation position of the displacement detection member 21 is different.

[0072] Please refer to Figure 9 and Figure 10 Specifically, the displacement detection member 21 is detachably connected to the stretching member 12 or the measured member 200, and the displacement detection member 21 is used to detect the displacement change of the stretching member 12 or the measured member 200, that is, the displacement detection member 21 is installed in a moving structure, and the displacement change of the measured member 200 can be obtained by detecting the displacement change between the stretching member 12 and other relatively fixed structures.

[0073] Please refer to Figure 9 In some optional embodiments, the displacement detection member 21 is detachably connected to the stretching member 12, and the displacement detection member 21 is arranged opposite to the assembly end surface 300 of the measured member 200, so as to detect the relative displacement change between the stretching member 12 and the assembly end surface 300, that is, the displacement change of the measured member 200 can be obtained, so as to realize the displacement change detection function of the displacement detection member 21.

[0074] Alternatively, the displacement detecting piece 21 can be detachably connected to the to-be-measured piece 200, and the displacement detecting piece 21 is oppositely arranged relative to the assembly end face 300 of the to-be-measured piece 200, so as to detect the relative displacement change between the to-be-measured piece 200 and the assembly end face 300, that is, the displacement change detection function of the displacement detecting piece 21 can be realized. Of course, the displacement detecting piece 21 can also be carried by setting a bearing structure on the to-be-measured piece 200, so that the displacement detecting piece 21 can detect the relative displacement change between the to-be-measured piece 200 and the assembly end face 300. For details, please refer to Figure 2 、 Figure 4 、 Figure 6 and Figure 8 The displacement detecting piece 21 is arranged at the position of the detection sheet 400 or the assembly nut 220, and a corresponding detection structure is added to the assembly end face 300.

[0075] Please refer to Figure 10 In other optional embodiments, the displacement detecting piece 21 can be detachably connected to the stretching piece 12, and the displacement detecting piece 21 is oppositely arranged relative to any inner wall of the shell 11 along the movement direction of the stretching piece 12, so as to detect the relative displacement change between the stretching piece 12 and any inner wall of the shell 11 along the movement direction of the stretching piece 12, that is, the displacement change of the to-be-measured piece 200 can be obtained, so as to realize the displacement change detection function of the displacement detecting piece 21.

[0076] Alternatively, the displacement detecting piece 21 can be detachably connected to the to-be-measured piece 200, and the displacement detecting piece 21 is oppositely arranged relative to any side wall of the shell 11 along the movement direction of the stretching piece 12, so as to detect the relative displacement change between the to-be-measured piece 200 and any side wall of the shell 11 along the movement direction of the stretching piece 12, that is, the displacement change of the to-be-measured piece 200 can be obtained, so as to realize the displacement change detection function of the displacement detecting piece 21. For details, please refer to Figure 1 The displacement detecting piece 21 is arranged at the position of the assembly nut 220.

[0077] Of course, the displacement detecting piece 21 can also be carried by setting a bearing structure on the to-be-measured piece 200, and a detection structure is arranged on the shell 11, and the detection structure is arranged parallel to any side wall of the shell 11 along the movement direction of the stretching piece 12, and the two are oppositely arranged, so that the displacement detecting piece 21 can detect the relative displacement change between the to-be-measured piece 200 and the assembly end face 300. For details, please refer to Figure 3 、 Figure 5 and Figure 7 The position of the displacement detecting piece 21 is inversed relative to the detection sheet 400.

[0078] Of course, in other embodiments, the object detected by the displacement detecting piece 21 can also be adaptively changed according to actual needs, which is not limited here.

[0079] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present application. Here, it is not necessary and impossible to exhaust all the embodiments. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application claims.

Claims

1. A device for measuring the preload force of installed bolts, characterized in that: include: A stretcher (10), the stretcher (10) being connectable to the object to be measured (200), and the stretcher (10) being connectable to a power source; a displacement detection member (21), the displacement detection member (21) being arranged on either side of the stretcher (10), the displacement detection member (21) being used to detect the displacement stretching distance of the piece to be measured (200); The stretcher (10) is configured to stretch the piece to be measured (200), and to stop stretching and provide a stretching force value when the displacement detection member (21) detects a sudden displacement change of the piece to be measured (200).

2. The preload axial force measuring device for an installed bolt according to claim 1, characterized in that: The stretcher (10) comprises a housing (11) and a stretching member (12); the stretching member (12) is disposed through the housing (11) and can be connected to the piece to be measured (200) to drive the piece to be measured (200) to be stretched.

3. The preload axial force measuring device for an installed bolt according to claim 2, characterized in that: The displacement detection member (21) is detachably connected to the housing (11) or the assembly end surface (300) of the object to be measured (200), and the displacement detection member (21) is used to detect the displacement change of the object to be measured (200); or, The displacement detection member (21) is detachably connected to the tensile member (12) or the member to be measured (200), and the displacement detection member (21) is used to detect displacement changes of the tensile member (12) or the member to be measured (200).

4. The preload axial force measuring device for an installed bolt according to claim 3, characterized in that: The displacement detecting member (21) is detachably connected to the housing (11) or the assembly end surface (300), and the displacement detecting member (21) is arranged opposite to the assembly nut (220) of the object to be measured (200) to detect the displacement change of the assembly nut (220); or The displacement detection member (21) is detachably connected to the housing (11) or the assembly end surface (300); a detection piece (400) is provided on the object to be measured (200); the displacement detection member (21) and the detection piece (400) are arranged opposite to each other to detect displacement changes of the detection piece (400).

5. The preload axial force measuring device for an installed bolt according to claim 4, characterized in that: The detection piece (400) is fixedly arranged on the assembly bolt (210) of the piece to be measured (200); or the detection piece (400) is fixedly arranged on the end face of the assembly nut (220); or the detection piece (400) is vertically arranged on the outer periphery of the assembly nut (220).

6. The preload axial force measuring device for an installed bolt according to claim 3, characterized in that: The displacement detecting member (21) is detachably connected to the tensile member (12) or the member to be measured (200), and the displacement detecting member (21) is arranged opposite to the assembly end face (300) of the member to be measured (200) to detect a relative displacement change between the tensile member (12) and the assembly end face (300), or to detect a relative displacement change between the member to be measured (200) and the assembly end face (300); or, The displacement detecting member (21) is detachably connected to the tensile member (12) or the member to be measured (200). The displacement detecting member (21) is arranged opposite to any side wall of the housing (11) along the moving direction of the tensile member (12) to detect a relative displacement change between the tensile member (12) and any side wall of the housing (11) along the moving direction of the tensile member (12), or to detect a relative displacement change between the member to be measured (200) and any side wall of the housing (11) along the moving direction of the tensile member (12).

7. The preload axial force measuring device for an installed bolt according to claim 1, characterized in that: A fixing seat (22) is provided at one end of the displacement detection member (21) away from the detection end, and the fixing seat (22) is detachably connected to either side of the stretcher (10).

8. The preload axial force measuring device for an installed bolt according to claim 7, characterized in that: The fixing seat (22) and the stretcher (10) are magnetically connected, threadedly connected, position-limited connected or clamped.

9. The preload axial force measuring device for an installed bolt according to claim 8, characterized in that: The fixing surface of the fixing seat (22) is provided with a plurality of magnetic elements, and the magnetic elements are magnetically connected to the stretcher (10) so as to achieve a magnetic connection between the fixing seat (22) and the stretcher (10).

10. The preload axial force measuring device for an installed bolt according to any one of claims 1 to 9, characterized in that: A controller is also included. The power source and the displacement detection member (21) are both electrically connected to the controller. The controller is used to control and receive measurement information of the displacement detection member (21) and to control the opening or closing of the power source.

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