CN219142525U - A shear test device - Google Patents

Abstract

The utility model relates to a shear force testing device. The shear force test device includes a support mechanism, a horizontal movement mechanism, a rotation movement mechanism, a shear force generation mechanism and a shear force detection mechanism; the support mechanism includes a base, a line rail above the base and bearing pieces at both ends of the base; The moving mechanism includes a horizontal moving platform and a moving slider, and the moving slider is embedded on the line rail; the rotating moving mechanism includes a rotating moving platform, which is located above the horizontal moving platform; the shearing force generating mechanism includes a motor, a rigid coupling, a fixed pillar and a wire Rod, the motor is connected with the steel coupling and the supporting mechanism is fixedly connected, the steel coupling is connected with the screw rod through the bearing piece, the fixed pillar is fixedly connected with the supporting mechanism; the screw rod is connected with the screw nut inside the horizontal moving platform, And pass through the horizontal moving platform and be fixed on the bearing sheet; the shear force detection mechanism includes a pressure sensor, a moving cross bar, a clamping mechanism and a stainless steel sheet.

Description

A shear test device

technical field

The utility model relates to the technical field of welding technology detection, in particular to a shear force testing device.

Background technique

With the rapid development of heterogeneous composite materials, the connection between metal and heterogeneous materials is a key technology, and the connection technology of metal and plexiglass (also known as acrylic plate) is widely used in automobiles, aerospace, electronic equipment, etc. field. At present, the traditional connection methods of metal and plexiglass mainly include mechanical connection and chemical bonding. The disadvantage of mechanical connection is that the introduction of hole structure reduces the airtightness of the connection body, and the use of fasteners also increases the weight of the connection body. It is not conducive to lightweight; the composite under the chemical bonding process is easily affected by the environment, and the chemical agent is easy to decompose under extreme conditions, which is not friendly to the environment. The laser welding technology is applied to the connection of dissimilar materials, which has the advantages of non-contact welding, clean weld seam, small heat-affected area, high efficiency and environmental protection.

In the field of laser welding technology, it is necessary to test the performance of the connected body after welding, and the connection strength is the index that best characterizes the performance of the connected body. Connection strength can be divided into shear strength and tensile strength. For the measurement of tensile strength between acrylic plate and metal, the measurement of tensile strength can be realized by bonding glue and special rubber. However, for the measurement of shear strength, the current mainstream method is to use a universal testing machine for measurement. However, the universal testing machine is expensive, the equipment is huge, it occupies a large area, it is difficult to move, and the testing place is limited. In actual research, a large amount of experimental data is needed to analyze the shear strength of connecting materials. Therefore, testing with a universal testing machine has problems such as complexity, time-consuming, and low efficiency.

The Chinese utility model patent with application number 202221529473.7 discloses a sample shear force testing device, but the device requires manual application of external force for measurement, which is labor-intensive and time-consuming. The Chinese invention patent with the application number 201911211680.0 discloses a test device and test method for the shear modulus of brittle materials, but the shape of the measured material is relatively fixed, it is difficult to adjust the angle of the material to align with the measurement device, and a universal testing machine is required Take measurements. The Chinese Utility Model Patent Application No. 201520876918.2 discloses a joint surface shear force test device, but it requires strict parallelism at both ends of the material, which greatly limits the connection position and shape of the measurement sample.

Utility model content

In view of this, it is necessary to provide a shear force testing device for the above-mentioned problems, which is convenient for quickly and accurately measuring the shear force of laser-welded metal and plexiglass (hereinafter referred to as acrylic plate) joints.

In order to achieve the above object, the utility model takes the following technical solutions:

A shear force testing device, comprising a support mechanism, a horizontal movement mechanism, a rotation movement mechanism, a shear force generation mechanism and a shear force detection mechanism;

The supporting mechanism includes a base and a wire rail located above the base, the wire rail and the base are fixed by screws, and bearing pieces are connected to both ends of the base;

The horizontal moving mechanism includes a horizontal moving platform and a moving slider, the moving slider is fixed below the horizontal moving platform by screws, the moving slider is embedded on the line rail, and the inside of the horizontal moving platform is provided with a screw nut;

The rotary movement mechanism includes a rotary mobile platform, and the rotary mobile platform is fixed above the horizontal mobile platform by screws;

The shear force generating mechanism includes a motor, a rigid coupling, a fixed pillar and a screw rod, the motor is connected to the rigid coupling and is fixedly connected to the supporting mechanism, and the rigid coupling is fixed on a horizontal plane through a bearing plate It is connected with the screw rod, and the fixed pillar is fixedly connected with the support mechanism through screws; the screw rod is connected with the screw nut inside the horizontal moving platform, and is fixed on the bearing piece through the horizontal moving platform;

The shear force detection mechanism includes a pressure sensor, a moving cross bar, a clamping mechanism and a stainless steel sheet; the pressure sensor is fixedly connected to the moving cross bar, and the moving cross bar is embedded in a fixed pillar and moves up and down according to the height of the sample to be tested Adjustment; the clamping mechanism is connected with the pressure sensor through threads, and is used for clamping the stainless steel sheet.

Further, in the above-mentioned shear force testing device, there are two wire rails.

Further, in the above-mentioned shear force testing device, there are four moving sliders.

Further, in the above-mentioned shear force testing device, a handle is provided on the rotating mobile platform.

Further, in the above-mentioned shear force testing device, a loose screw is provided on the rotating mobile platform.

Further, in the above-mentioned shear force testing device, screw holes are arranged on the rotating mobile platform, and the sample to be tested is fixed on the rotating mobile platform by flat-bottomed screws.

Further, in the above-mentioned shear force testing device, the screw rod is parallel to the wire track and has the same length.

Further, in the above shear force testing device, the pressure sensor is a miniature pressure sensor.

Further, in the above-mentioned shear force testing device, the clamping mechanism is a clamping block, and a groove is provided in it for clamping the stainless steel sheet.

Further, in the above-mentioned shear force testing device, one end of the stainless steel sheet is bonded with a rubber pad by glue.

Further, in the above-mentioned shear force testing device, the size of the stainless steel sheet is consistent with the size of the acrylic plate in the sample to be tested.

Further, in the above-mentioned shear force testing device, an inverted triangle structure is provided under the moving cross bar, which provides support for the pressure sensor and the clamping mechanism, and avoids measurement errors caused by deformation of the pressure sensor due to gravity.

Further, in the above shear force testing device, the bottom of the fixed pillar is a triangular support structure.

Further, in the above-mentioned shear force testing device, the sample to be tested is a laser-welded metal and acrylic plate connection.

Further, in the above-mentioned shear force testing device, the motor is controlled by a controller and a motor driver; the pressure sensor performs data measurement and recording by a computer.

The beneficial effects of the utility model are:

1. The rotary movement mechanism set in the utility model can realize the alignment of the acrylic plate and the stainless steel sheet, and the stainless steel sheet contacts the overall surface of the end face of the sample to be tested, avoiding measurement errors; the buffer of the rubber pad on the stainless steel sheet also prevents the sample to be tested Damage to materials due to uneven force;

2. The height of the moving bar set in the utility model can be adjusted, so that the position of the pressure sensor can be adjusted, and there is no fixed limit to the thickness of the sample to be tested and the connection position, and the degree of freedom is high;

3. The utility model does not need to cooperate with the universal testing machine, and can be measured in multiple places, and is more compact and portable;

4. The utility model only needs to replace the stainless steel iron sheet corresponding to the sample to be tested when measuring, the motor is convenient to control, and the operation is simpler.

Description of drawings

Fig. 1 is the structural representation of shear force testing device described in the utility model;

Fig. 2 is the top view of the shear force testing device described in the utility model;

Fig. 3 is the front view of the shear force testing device described in the utility model;

Fig. 4 is a disassembly schematic diagram of fixing the sample to be tested according to the present invention.

Reference signs:

1-base, 2-line rail, 3-bearing sheet, 4-horizontal moving platform, 5-moving slider, 6-rotating moving platform, 7-motor, 8-rigid coupling, 9-fixed pillar, 10 -screw, 11-pressure sensor, 12-moving bar, 13-clamping mechanism, 14-stainless steel sheet, 15-flat bottom screw, 16-hand handle, 17-rubber pad, 18-metal, 19-acrylic plate, 20 - elastic screws.

Detailed ways

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will further introduce the present invention in conjunction with specific embodiments and accompanying drawings. Obviously, the accompanying drawings in the following description are only illustrations of the present invention. For some embodiments, those of ordinary skill in the art can also obtain other drawings based on these drawings without creative effort.

It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", "top", "inner" etc. are based on The orientation or positional relationship shown in the accompanying drawings is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood To limit the utility model.

The terms "first", "second", and "third" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first", "second" and "third" may explicitly or implicitly include one or more of these features. In the description of the present utility model, unless otherwise specified, "a group" means two or more.

Example 1

As shown in Figure 1, a kind of shear force testing device, comprises support mechanism, horizontal movement mechanism, rotation movement mechanism, shear force generation mechanism and shear force detection mechanism;

The support mechanism includes a base 1 and a wire rail 2 positioned above the base, the wire rail 2 and the base 1 are fixed by screws, and bearing pieces 3 are connected to both ends of the base; the wire rail 2 is two strip;

The horizontal moving mechanism includes a horizontal moving platform 4 and a moving slider 5. There are four moving sliders 5, which are fixed below the horizontal moving platform 4 by screws. The moving slider 5 is embedded on the line rail 2. The horizontal moving platform 4 is provided with screw nuts inside;

Described rotary movement mechanism comprises rotary mobile platform 6, and described rotary mobile platform 6 is fixed on the top of horizontal mobile platform 4 by screw; There are arranged screw hole and flat screw 15 on the rotary mobile platform 6, and the sample to be tested is fixed on the rotary mobile platform. On the platform; the rotary mobile platform 6 is provided with a handle 16 and a loose screw 20;

The shear force generating mechanism includes a motor 7, a rigid coupling 8, a fixed pillar 9 and a screw mandrel 10, the motor 7 is connected with the rigid coupling 8 and is fixedly connected with the supporting mechanism, and the rigid coupling 8 The bearing piece 3 is fixed on the horizontal plane and connected with the screw rod 10, and the fixed pillar 9 is fixedly connected with the support mechanism through screws; the screw rod 10 is connected with the screw nut inside the horizontal moving platform 4, and passes through the horizontal moving platform 4 is fixed on the bearing piece 3, the screw rod 10 is parallel to the line rail 2 and has the same length;

Described shear force detecting mechanism comprises pressure sensor 11, moving cross bar 12, clamping mechanism 13 and stainless steel sheet 14; Described pressure sensor 11 is miniature pressure sensor, and it is fixedly connected with moving cross bar 12; Said moving cross bar 12 is embedded in the fixed pillar 9 and moved up and down according to the height of the sample to be measured. There is an inverted triangle structure under the moving cross bar, which provides support for the pressure sensor and the clamping mechanism, and avoids the measurement caused by the deformation of the pressure sensor due to gravity. Error; the clamping mechanism 13 is a clamping block, which is connected with the pressure sensor 11 through threads, and a groove is arranged in it for clamping the stainless steel sheet 14; one end of the stainless steel sheet 14 is bonded with a rubber Pad 17, the size of the stainless steel sheet is consistent with the size of the acrylic plate in the sample to be tested;

The sample to be tested is a connected body of laser welding metal 18 and acrylic plate 19; the motor is controlled by a controller and a motor driver; and the pressure sensor is used for data measurement and recording by a computer.

The method for measuring the shear force using the above-mentioned shear force testing device is:

(1) Select a suitable stainless steel sheet 14 according to the size of the acrylic plate 19 in the sample to be tested, put it into the groove of the clamping block and fix it, so that the rear surface of the stainless steel sheet 14 is close to the rear surface of the groove;

(2) Adjust the horizontal mobile platform 4 to the side close to the stainless steel sheet 14, reserve a certain distance, and place the sample to be tested horizontally on the rotary mobile platform 6, with the metal 18 at the bottom and the acrylic plate 19 at the top. Screw the flat-bottomed screw 15 into the screw hole on the rotating mobile platform close to the metal 18, tighten and fix the sample to be tested (as shown in Figure 4), the connection of the flat-bottomed screw 15 should be as horizontal as possible with the measuring end; rotate the handle 16 to control the rotation Move the platform 6 so that one end of the acrylic plate 19 is roughly parallel to the contact surface of the stainless steel sheet 14;

(3) Use the controller and the motor driver to drive the rotation of the motor 7, so that the horizontal moving platform 4 moves toward the stainless steel sheet 14 until the acrylic plate 19 is about 5 mm away from the rubber pad 17; adjust the moving cross bar 12 up and down until the rubber pad 17 The bonding surface of the bottom end and the metal 18 and the acrylic plate 19 is roughly on the same level, adjust the stainless steel sheet 14 left and right to make it horizontally aligned with the acrylic plate 19, and then fix it in the clamping block;

(4) control the rotation of motor 7 and collect the data of miniature pressure sensor 11:

① The motor rotates, and the horizontal moving platform 4 moves towards the stainless steel sheet 14 at a speed of 5mm/min until the pressure on the micro pressure sensor 11 reaches 5N (the sample alignment process, the top material acrylic plate 19 at this time is due to unbalanced force) Drive the rotating mobile platform 6 to rotate until the measuring end of the acrylic plate 19 of the top material is completely aligned horizontally with the stainless steel sheet 14, and the acrylic plate 19 and the rubber pad 17 achieve the maximum fit. The alignment pressure value can be properly adjusted according to different materials), tighten and rotate The elastic screw 20 of mobile platform 6 prevents it from rotating;

②Horizontally move the platform 4 away from the rubber pad 17 by 1mm at a speed of 5mm/min (releasing the pretightening force during alignment), and the indication of the miniature pressure sensor 11 is zeroed;

③ The horizontal moving platform 4 moves towards the stainless steel sheet 14 at a speed of 2mm/min. At this time, the micro pressure sensor 11 samples the pressure data, and records the comparison between the force of the previous 0.5s and the current force. The sampling rate is 1kHz. When it is detected that the current force is lower than 80% of the force in the previous 1 ms, the motor 7 stops rotating, and the peak value data is recorded; (the peak value is the value of the shear force of the sample)

④ The motor 7 rotates in the opposite direction away from the stainless steel sheet 14, and the test is completed.

The utility model test principle is:

The sample to be tested is composed of upper and lower materials. The top material is acrylic plate and the bottom material is metal. The two materials are fixed together by laser connection or other connection methods. The bottom material is fixed on the rotatable platform, and the screw holes arranged vertically can realize multi-angle fixing. The screw nut is driven by the rotation of the motor, and then the horizontal moving platform is moved. When performing shear force measurement, the side of the sample to be tested needs to be completely in contact with the end surface of the stainless steel sheet. Therefore, before the measurement, the rotating platform can be manually controlled to make the side of the sample to be tested parallel to the end surface of the stainless steel sheet. When one end of the top material first When the rubber pad is touched, due to the force of the obstruction, the top material drives the rotating mobile platform to rotate until the side of the top material and the side of the rubber pad completely contact and coincide, that is, the side surface of the acrylic plate of the top material and the end surface of the stainless steel sheet are in contact with the largest area, and the tightening is tight. Screws prevent measurement errors caused by rotation of the rotating platform. As the horizontal moving platform advances, the rubber pad prevents the displacement of the top material and causes an interaction force between the two materials. The force data of the pressure sensor will gradually increase until a sudden change occurs. The force data before the sudden change is the largest, indicating that the material has reached the maximum shear force, and the top material has fallen off. This data is the maximum shear force between the samples to be tested. data.

The above-mentioned embodiments only express the best implementation mode of the utility model, and the description thereof is relatively specific and detailed, but it should not be construed as limiting the patent scope of the utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (10)

1. A shear force testing device is characterized by comprising a supporting mechanism, a horizontal moving mechanism, a rotary moving mechanism, a shear force generating mechanism and a shear force detecting mechanism;

the supporting mechanism comprises a base (1) and a wire rail (2) positioned above the base (1), wherein the wire rail (2) is fixed with the base (1) through screws, and two ends of the base (1) are connected with bearing sheets (3);

the horizontal moving mechanism comprises a horizontal moving platform (4) and a moving sliding block (5), wherein the moving sliding block (5) is fixed below the horizontal moving platform (4) through a screw, the moving sliding block (5) is inlaid on the linear rail (2), and a screw rod nut is arranged inside the horizontal moving platform (4);

the rotary moving mechanism comprises a rotary moving platform (6), and the rotary moving platform (6) is fixed above the horizontal moving platform (4) through screws;

the shearing force generation mechanism comprises a motor (7), a rigid coupler (8), a fixed support column (9) and a screw rod (10), wherein the motor (7) is connected with the rigid coupler (8) and fixedly connected with the supporting mechanism, the rigid coupler (8) is fixed on a horizontal plane through a bearing sheet (3) and is connected with the screw rod (10), and the fixed support column (9) is fixedly connected with the supporting mechanism through a screw; the screw rod (10) is connected with a screw rod nut in the horizontal moving platform (4) and penetrates through the horizontal moving platform (4) to be fixed on the bearing sheet (3);

the shear force detection mechanism comprises a pressure sensor (11), a movable cross rod (12), a clamping mechanism (13) and a stainless steel sheet (14); the pressure sensor (11) is fixedly connected with the movable cross rod (12), and the movable cross rod (12) is embedded in the fixed support column (9) and is adjusted in an up-and-down moving mode according to the height of a sample to be detected; the clamping mechanism (13) is connected with the pressure sensor (11) through threads and is used for clamping the stainless steel sheet (14).

2. Shear force testing device according to claim 1, characterized in that the wire track (2) is two.

3. Shear force testing device according to claim 1, characterized in that the number of moving slides (5) is 4.

4. Shear force testing device according to claim 1, characterized in that the rotary movement platform (6) is provided with a hand grip (16) and an elastic screw (20).

5. The shear force testing device of claim 1, wherein the bottom of the stationary support column is a triangular support structure.

6. The shear force testing device of claim 1, wherein the rotary motion platform (6) has an array of threaded flat bottom screws (15) thereon to secure the sample to be tested to the rotary motion platform (6).

7. A shear force testing device according to claim 1, wherein the clamping means (13) is a clamping block having a recess therein for clamping the stainless steel sheet (14).

8. Shear force testing device according to claim 1, characterized in that the pressure sensor (11) is a miniature pressure sensor.

9. A shear force testing device according to claim 1, wherein one end of the stainless steel sheet (14) is glued with a rubber pad (17).

10. The shear force testing device of claim 1, wherein the sample to be tested is a laser welded metal (18) and acrylic plate (19) joint.

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