CN216791827U

CN216791827U - Bending moment testing device

Info

Publication number: CN216791827U
Application number: CN202123006534.XU
Authority: CN
Inventors: 冯嘉雨; 王利; 崔国亮; 康铭; 李岩; 何金
Original assignee: China Zhongwang Holdings Ltd
Current assignee: China Zhongwang Holdings Ltd
Priority date: 2021-12-02
Filing date: 2021-12-02
Publication date: 2022-06-21
Anticipated expiration: 2031-12-02

Abstract

The utility model belongs to the technical field of fastener testing, and discloses a bending moment testing device which comprises a base, wherein the base is in an inverted T shape, the outer edge of one side of a bottom plate of the base is provided with a supporting block, a pressing rod which is used for supporting a fastener to be tested and can rotate towards the fastener to be tested is hinged to the supporting block, and an adjusting push rod acting on the pressing rod is arranged on a vertical plate of the base and at a height close to the vertical top end of the pressing rod. The bending moment testing device realizes quantitative detection of the bending moment of the fastener of the assembled equipment by utilizing Hooke's law and a lever principle, and has the advantages of simple structure, high accuracy, simplicity and convenience in manufacture, use and maintenance.

Description

Bending moment testing device

Technical Field

The utility model belongs to the technical field of fastener testing, and particularly relates to a bending moment testing device.

Background

After the fasteners are assembled in the modes of riveting, screwing, welding and the like, the bending moment needs to be checked, the existing bending moment checking device on the market is difficult to be applied to the checking of the bending moment of the fasteners on the body-in-white sub-assembly, and the bending moment checking device is specially designed and used for checking the bending moment bearing capacity of the fasteners on the assembly equipment.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a bending moment testing apparatus with simple structure and strong practicability, so as to implement quantitative test of bending moment of a fastener.

In order to achieve the purpose, the utility model provides the following technical scheme:

the utility model provides a bending moment testing device which comprises a base, wherein the base is in an inverted T shape, the outer edge of one side of a bottom plate of the base is provided with a supporting block, a pressing rod which is used for supporting a fastener to be tested and can rotate towards the fastener to be tested is hinged to the supporting block, and an adjusting push rod acting on the pressing rod is arranged on a vertical plate of the base and at a height close to the vertical top end of the pressing rod.

Furthermore, a bottom plate of the base is provided with a positioning hole.

Further, the pressure bar is provided as a hardened surface on the corresponding surface facing the fastener to be tested.

Furthermore, scales are arranged on the adjusting push rod, and one side of the vertical plate of the base is processed into a reading reference surface for reading the scales.

Further, still include fixed block, screw rod and hinge, set up the fixed block on the bottom plate of base and for riser and support the piece heteropleural side, the screw rod is established on the fixed block, and the one end of hinge twines on the screw rod, and the other end is established on the riser top, and the hinge presses on adjusting push rod.

Furthermore, a pulley is arranged on the adjusting push rod, and a hinge is arranged on the pulley.

Furthermore, a spring is arranged between the adjusting push rod and the pressure rod.

The utility model has the beneficial effects that:

1. the bending moment testing device provided by the utility model realizes quantitative detection of the bending moment of the fastener of the assembled equipment by using Hooke's law and a lever principle, and has the advantages of simple structure, high accuracy, simplicity and convenience in manufacture, and convenience in use and maintenance.

2. The structure size of the bending moment testing device can be flexibly calculated and designed according to main fastener products; the hinge design can adapt to a longer adjusting push rod, and the increase of the size of the base along with the increase of the length of the adjusting push rod is avoided.

Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model. The objectives and other advantages of the utility model may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.

Drawings

For the purposes of promoting a better understanding of the objects, aspects and advantages of the utility model, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic front view of a bending moment testing apparatus according to the present invention;

FIG. 2 is a schematic view of a planar structure of the base shown in FIG. 1;

FIG. 3 is a schematic view of the screw of FIG. 1;

FIG. 4 is a schematic plan view of the adjustment push rod of FIG. 1;

FIG. 5 is a schematic view of an initial position of the bending moment testing apparatus according to the present invention;

FIG. 6 is a schematic view of a working position of the bending moment testing device of the present invention;

description of reference numerals: the device comprises a base 1, a screw rod 2, a fixing block 3, a hinge 4, a pulley 5, an adjusting push rod 6, scales 7, a reading reference surface 8, a positioning hole 9, a spring 10, a butting block 11, a pressing rod 12, a hardened surface 13 and a fastener 14 to be tested.

Detailed Description

The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Example one

As shown in fig. 1 to 4, the bending moment testing apparatus provided in this embodiment includes a base 1 in an inverted T shape, a supporting block 11 is provided at an outer edge of one side of a bottom plate of the base 1, a pressing rod 12 that is used for supporting a fastener 14 to be tested and can rotate toward the fastener 14 to be tested is hinged to the supporting block 11, an adjusting push rod 6 acting on the pressing rod 12 is provided on a vertical plate of the base 1 and at a height close to a vertical top end of the pressing rod 12, a positioning hole 9 is provided on the bottom plate of the base 1, so as to be conveniently positioned and installed at one side of the fastener to be tested, a corresponding surface of the pressing rod 12 facing the fastener 14 to be tested is provided with a hardened surface 13 to ensure sufficient strength, a scale 7 is provided on the adjusting push rod 6, and a reading reference surface 8 for reading the scale 6 is processed at one side of the vertical plate of the base 1. Therefore, the supporting block of the base supports against the bottom of the pressure rod, the pressure rod supports against the fastener to be tested, and the adjusting push rod acts on the top of the pressure rod to complete the measurement of the bending moment of the fastener to be tested.

Example two

The difference between the present embodiment and the first embodiment is: still including fixed block 3, screw rod 2, hinge 4, pulley 5 and spring 10, set up fixed block 3 on base 1's the bottom plate and for the riser with support 11 different sides, screw rod 2 is established on fixed block 3, the one end of hinge 4 twines on screw rod 2, and the other end is established on the riser top, is equipped with pulley 5 on the adjusting push rod 6, and hinge 4 winds on pulley 5, installs spring 10 between adjusting push rod 6 and the depression bar 12. Specifically, the inner wall of the slide way matched with the base and the adjusting push rod is subjected to antifriction treatment. The fixed block is not positioned on the middle shaft so as to prevent the hinge from deviating from the shaft. The pressing block of the base is matched with the pressing rod by a pin, and the arc groove is processed to enable the pressing rod to rotate freely within a limited range by taking the pin as an axis; the screw is screwed in from the outer side (far shaft side) to the inner side (near shaft side) through a threaded hole on the fixing block, so that the hinge is coiled on the screw, the adjusting push rod is loaded through gradual tightening of the hinge, and the screw is reversely screwed out for unloading; two ends of the hinge are respectively fixed above the fixed block slideway and on the end head of the screw rod, a pulley at the rear end of the adjusting push rod is overlapped, the adjusting push rod is tightened by controlling the screw rod, and the adjusting push rod is pressed to slide in the slideway. The hinge needs to ensure the strength and can be thickened or made into a plurality of bearing parts; the surface of the adjusting push rod is subjected to antifriction treatment, the rod body is marked with scales with the precision of 1mm, the rear end of the adjusting push rod fixes the pulley by a pin, the pulley can freely rotate by taking the pin as a shaft, the effect of reducing friction between the pulley and the hinge is achieved, the adjusting push rod is pressed by the hinge to move in the slide way, and the spring is compressed; the elastic coefficient of the spring is k, two ends of the spring are respectively fixed on the adjusting push rod and the pressure rod, the axis of the fixed spring is parallel to the moving direction of the adjusting push rod, and the fixed spring is extruded by the adjusting push rod to generate a load F which is kx; the surface of the pressure rod contacting the fastener to be tested needs to be hardened, the contact surface and the fastener to be tested are in point or line contact, and the thrust generated by the spring is converted into the bending moment applied to the fastener to be tested. In the test, as long as the fastener to be tested does not bend, the pressure lever is in the equilibrium position (FL is f l), at this time, the bending moment M applied to the fastener is f h, and if the fastener bends during the loading process, the pressure lever will leave the equilibrium position accordingly.

As shown in fig. 5-6, the use method of the bending moment testing device is as follows: before testing, the adjusting push rod and the pressure lever are ensured to be in the original positions, namely the 0-scribed line of the adjusting push rod is positioned on a reading reference surface; the pressure lever is in a vertical state; then, the contact surface of the pressure lever is close to the fastener to be tested, and the device and the fastener to be tested are respectively positioned and clamped; and then, slowly rotating the screw to tighten the hinge, stopping rotating when the compression amount of the spring reaches a preset value x if the bending moment bearing test is carried out, and passing the test if the fastener is not subjected to bending deformation (the pressure lever is still at a balance position). And the preset value calculation formula is as follows: x is M l/kLh, wherein h is the measured height of the fastener to be measured; l is a power arm; l is a resistance arm and is related to h; m is a bending moment; if the ultimate bending moment test is carried out, the test piece is slowly loaded until the fastener is subjected to bending deformation (the pressure lever leaves the balance position), the compression amount xm of the spring is recorded, and the ultimate bending moment Mm of the fastener to be tested is calculated.

In addition, the requirement of the measuring range and the part performance of the bending moment testing device is as follows: the range (0-xl) of the scale mark does not exceed the limit compression amount of the spring; measurable ultimate bending moment of this device: selecting a proper spring (k), an adjusting push rod (x) and a pressure rod (L) by considering actual requirements (h and Ml); a hinge capable of bearing the load of the spring in the extreme compression state without plastic deformation; a screw long enough to coil the hinge when the spring reaches the limit of compression.

Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims

1. The utility model provides a bending moment testing arrangement, includes base (1), its characterized in that, the base is the shape of falling T, bottom plate one side outer fringe of base is equipped with supports piece (11), it has the depression bar (12) that are used for supporting on fastener (14) that awaits measuring and can be to the fastener pivoted that awaits measuring to articulate on the piece to support, on the riser of base and being close to the vertical top of depression bar highly be equipped with the adjusting push rod (6) that act on the depression bar.

2. Bending moment testing device according to claim 1, wherein the base plate of the base is provided with positioning holes (9).

3. Bending moment testing device according to claim 1, wherein the pressure lever is provided as a hardened surface (13) at the corresponding face facing the fastener to be tested.

4. The bending moment testing device according to claim 1, wherein the adjusting push rod is provided with a scale (7), and one side of the vertical plate of the base is processed into a reading reference surface (8) for reading the scale.

5. The bending moment testing device according to any one of claims 1 to 4, further comprising a fixing block (3), a screw (2) and a hinge (4), wherein the fixing block is arranged on the bottom plate of the base opposite to the vertical plate and the abutting block, the screw is arranged on the fixing block, one end of the hinge is wound on the screw, the other end of the hinge is arranged at the top end of the vertical plate, and the hinge is pressed against the adjusting push rod.

6. Bending moment testing device according to claim 5, wherein the adjusting push rod is provided with a pulley (5), and the hinge is provided on the pulley.

7. Bending moment testing device according to claim 5, wherein a spring (10) is provided between the adjusting push rod and the pressure rod.