Preparation device of adhesive tensile shear strength test sample

Abstract

The utility model provides a preparation device of an adhesive tensile shear strength test sample, and aims to solve the technical problems that the existing sample preparation device is difficult to accurately control the lap joint length and the compression strength of the sample and upper and lower metal sheets of the sample are easy to misplace, so that the qualified rate of the prepared sample is low. According to the utility model, other parts and the metal sheet for manufacturing the sample are supported by the supporting and positioning unit, and meanwhile, the metal sheet for manufacturing the sample is accurately positioned, so that the lap joint length is accurately controlled, and the upper and lower metal sheets are prevented from being misplaced; pressure required by curing is applied to the lap joint part of the metal sheet through the control unit and the pressurizing unit, and the pressurizing strength is accurately controlled through the pressure detection unit. Therefore, the percent of pass of the sample can be improved by utilizing the device. In addition, the device is very convenient to operate, and a plurality of samples can be manufactured at a time.

Description

Technical Field

[0001] The utility model relates to the field of test sample preparation, in particular to a preparation device for adhesive tensile shear strength test samples. Background Art

[0002] When adhesives are used for structural bonding in aircraft, the bonded components are subject to various stresses, requiring them to exhibit excellent bonding properties. The most common method for assessing adhesive bonding performance is to perform tensile shear strength tests on adhesive-bonded specimens.

[0003] Existing specimen preparation devices often use a simple screw-tightening method to pressurize and secure the specimen. During use, the adhesive-coated specimen is placed under a screw-studded pressure column, which is then tightened to secure the specimen. However, the drawbacks of this type of specimen preparation device are that the overlap length and pressure strength of the specimen are difficult to precisely control, and the upper and lower metal sheets of the specimen are prone to misalignment, resulting in a low pass rate for the specimens produced. Utility Model Content

[0004] In order to solve the technical problems that the existing sample preparation device is difficult to accurately control the overlap length and compressive strength of the sample, and the upper and lower metal sheets of the sample are easily misaligned, resulting in a low pass rate of the produced samples, the utility model provides a preparation device for adhesive tensile shear strength test samples.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A device for preparing adhesive tensile shear strength test specimens, which is special in that it includes: a support and positioning unit, a pressurizing unit, a control unit and a pressure detection unit;

[0007] The support and positioning unit is used to install and support the pressurizing unit, the control unit and the pressure detection unit, and to place the metal sheet used to make the sample. At the same time, the metal sheet is positioned by cooperating with the axial hole of the metal sheet to ensure the overlap length of the metal sheet and prevent dislocation;

[0008] The pressurizing unit is used to apply pressure to the overlapping parts of the metal sheets used to prepare the specimens;

[0009] The control unit is used to control the action of the pressurizing unit;

[0010] The pressure detection unit is used to detect the pressure applied by the pressurizing unit to the overlapping parts of the metal sheets, which serves as a reference for the control unit to achieve precise control of the pressure applied by the pressurizing unit.

[0011] Furthermore, the supporting and positioning unit includes a supporting frame consisting of a bottom plate and a support; the support consists of an upper plate and a side plate, the upper plate is parallel to and located above the bottom plate, and the side plate is perpendicular to and located on one side of the bottom plate; two positioning columns and limiting columns are also provided on the bottom plate, the positioning columns are used to cooperate with the positioning holes on the two metal sheets constituting the sample to position them, and there are two groups of limiting columns, two in each group, which limit the sample therein by cooperating with the side walls of the metal sheet used to make the sample, thereby preventing the metal sheet from shifting when being pressed; a support block is provided on the top of the upper plate, and a locking screw for locking the pressurizing unit is provided on the side wall of the upper plate;

[0012] The pressurizing unit includes a lead screw, a pressure plate, a pressure block and a pressure plate; the lead screw is vertically arranged, the upper part passes through the upper plate and extends out, the lower part passes through the pressure plate and is connected to the pressure plate, and the side wall is provided with a locking groove that cooperates with the locking screw; the pressure block is arranged below the pressure plate, and a through hole is opened on the pressure block for cooperating with the clearance of the positioning column so that it can pass through; a boss is provided in the middle of the lower surface of the pressure block for applying pressure to the overlapping part of the metal sheet used to make the sample; a mounting cavity for accommodating the pressure plate is reserved between the pressure block and the pressure plate, and the pressure plate is located in the mounting cavity and is fixed to the lead screw by screws;

[0013] The locking screw is used to lock and unlock the lead screw;

[0014] The control unit includes a rotating nut that cooperates with the thread of the lead screw. The rotating nut is installed in the support block and can only rotate in the support block but cannot move up and down. By screwing the rotating nut, the movement of the pressure block connected to the lead screw is controlled to achieve pressure and release on the overlapping part of the metal sheet located below the pressure block;

[0015] The pressure detection unit includes a pressure sensor and a pressure display. The pressure sensor is arranged between the pressure plate and the pressure block. The pressure display is used to display the detection value of the pressure sensor.

[0016] Furthermore, the pressurizing unit further includes a guide post for guiding the pressing block when it moves up and down, so as to ensure that the boss at the bottom of the pressing block does not deviate when applying pressure to the overlapping portion of the metal sheets constituting the sample.

[0017] Furthermore, the guide column is vertically arranged, the lower portion of which is connected to the pressing block by interference fit, and the upper portion passes through the upper plate.

[0018] Furthermore, the positioning column and the base plate, as well as the limiting column and the base plate are connected by interference fit; and the support block and the upper plate are connected by welding.

[0019] Furthermore, the control unit also includes a rotating handle connected to the rotating nut.

[0020] Furthermore, the control unit also includes a bushing which is sleeved outside the lead screw, located inside the support block, and below the rotating nut.

[0021] Beneficial effects of the utility model:

[0022] 1. This utility model uses a support and positioning unit to support other components and the metal sheet used to make the sample, while also precisely positioning the metal sheet used to make the sample, accurately controlling its overlap length and preventing misalignment of the upper and lower metal sheets. The control unit and pressure unit apply the required pressure to the overlapped portion of the metal sheet for curing, and the pressure detection unit precisely controls the pressure intensity. Therefore, the utility model can improve the pass rate of the sample. Furthermore, this utility model is very convenient to operate.

[0023] 2. The utility model designs the component in the pressurizing unit for applying pressure to the metal sheet used to make the sample as a combined structure consisting of a pressure plate, a pressure block and a pressure plate. The lead screw is connected to the pressure plate after passing through the pressure plate, and the pressure plate and the pressure block are connected as one body. In this way, when the lead screw moves downward, the pressure block can be driven downward by the pressure plate to apply pressure to the metal sheet, and when the lead screw moves upward, the pressure block can be driven upward by the pressure plate to release the metal sheet. It is also convenient to adjust the position of the lead screw after assembly so that the locking groove on the side wall of the lead screw is aligned with the locking screw. At the same time, it is convenient to adjust the orientation of the pressure block during assembly so that it is consistent with the orientation of the metal sheet.

[0024] 3. The utility model has a simple structure and high reliability.

[0025] 4. The utility model can produce multiple samples at one time with high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional diagram of the present utility model.

[0027] Figure 2 It is a top view of the utility model.

[0028] Figure 3 The main view of this utility model Figure 1 (When the pressure sensor is placed between the pressure plate and the pressure block).

[0029] Figure 4 for Figure 3 Cross-section view at AA in the middle.

[0030] Figure 5 The main view of this utility model Figure 2 (When the pressure sensor is placed between the pressure block and the metal sheet).

[0031] Figure 6 for Figure 5 Cross-section view at AA in the middle.

[0032] In the picture:

[0033] 100-support positioning unit, 101-support block, 102-support frame, 103-locking screw, 104-positioning column, 105-limiting column;

[0034] 200-pressurizing unit, 201-screw, 202-guide column, 203-pressing plate, 204-pressing block, 205-pressing plate;

[0035] 300-control unit, 301-rotating nut, 302-rotating handle, 303-bushing;

[0036] 400-pressure detection unit, 401-pressure display, 402-pressure sensor;

[0037] 500-Metal sheet used to make the test specimen. DETAILED DESCRIPTION

[0038] The present invention will be described clearly and completely below with reference to the accompanying drawings.

[0039] See Figure 1-4 The device for preparing adhesive tensile shear strength test specimens provided by the present invention includes a supporting and positioning unit 100 , a pressurizing unit 200 , a manipulation unit 300 and a pressure detection unit 400 .

[0040] The support and positioning unit 100 is used to install the support and pressurization unit 200, the control unit 300, the pressure detection unit 400, and the metal sheet 500 used to prepare the sample, while also positioning the metal sheet 500. The support and positioning unit 100 includes a support frame 102, a positioning column 104, a limiting column 105, a support block 101, and a locking screw 103. The support frame 102 includes a base plate 1021 and a support 1022. The support 1022 consists of an upper plate 10221 and a side plate 10222. The upper plate 10221 is parallel to and located above the base plate 1021, while the side plate 10222 is perpendicular to the base plate 1022 and is mounted on one side of the base plate 1021. The positioning posts 104 and the limiting posts 105 are both provided on the upper surface of the base plate 1021 and are located between the base plate 1021 and the upper plate 10221 of the support 1022. There are two positioning posts 104, each used to cooperate with the positioning holes on the two metal sheets constituting a sample, to position the two metal sheets constituting the sample to ensure the overlap length of the two metal sheets. By designing the distance between the two positioning posts 104 and the position of the corresponding positioning holes on the metal sheets, different overlap length requirements can be met. There are two groups of limiting posts 105, each used to cooperate with the two metal sheets constituting a sample. Each group of limiting posts 105 has two, which are arranged opposite to each other and are used to confine the metal sheets used to make the sample therein to prevent the metal sheets from shifting and being misplaced when the pressurizing unit 200 applies pressure to the metal sheets. The positioning posts 104 and the base plate 1021, as well as the limiting posts 105 and the base plate 1021, can be connected by interference fit or by threaded connection. The support block 101 is mounted on the upper plate 10221 of the support 1022 in the support frame 102 and is welded thereto; the support block 101 is used to support the control unit 300. The locking screw 103 is mounted on the side wall of the upper plate of the support 1022 in the support frame 102 and is used to lock the pressurizing unit 200.

[0041] The pressure unit 200 is used to apply pressure to the overlapped portion of the metal sheet 500 used for the specimen. Located within the support and positioning unit 100, the pressure unit comprises a lead screw 201, a pressure plate 203, a pressure block 204, a pressure plate 205, and a guide post 202. The lead screw 201 is vertically arranged, with its upper portion extending through the upper plate of the support 2011 in the support frame 102 and its lower portion extending through the pressure plate 203 (with a clearance fit between the lead screw 201 and the pressure plate 203) to connect to the pressure plate 205. The sidewalls of the lead screw 201 are machined with locking grooves for use with the locking screw 103. A pressure block 204 is positioned below the pressure plate 203 and is screwed to the latter. A through-hole is provided in the pressure block 204 to allow clearance between the positioning post 104 and the sample. A boss 2041 is located in the middle of the lower surface of the pressure block 204 to apply pressure to the overlapping portion of the metal sheet 500 used to prepare the sample. A mounting cavity for a pressure plate 205 is provided between the pressure block 204 and the pressure plate 203. The pressure plate 205 is located within this cavity and is secured to the lead screw 201 with screws. When the lead screw 201 moves downward, it can drive the pressure plate 205 to move downward, and then drive the pressure plate 203 and the pressure block 204 to move downward as a whole through the pressure plate 205, thereby applying pressure to the metal sheet; the size of the pressure plate 205 is larger than the through hole on the pressure plate 203 for the lead screw 201 to pass through, so that when the lead screw 201 moves upward, the through hole on the lead screw 201 can drive the pressure plate 203 and the pressure block 204 to move upward as a whole, thereby releasing the metal sheet. The guide column 202 is used to guide the pressing block 204 when it moves up and down, so as to ensure that the boss 2041 at the bottom of the pressing block 204 will not deviate when applying pressure to the overlapping part of the metal sheet 500 used to make the sample; the guide column 202 is vertically arranged, and its lower part is connected to the pressing block 204 by interference fit, and its upper part is located in the guide hole 10222 on the upper plate 10221 of the support 1022 in the support frame 102 and is a clearance fit, so that the guide column 202 can move relative to the support 1022 along the axis of the guide hole 10222.

[0042] The control unit 300 is used to control the operation of the pressurizing unit 200. Located above the pressurizing unit 200, the control unit consists of a rotating nut 301, a rotating handle 302, and a bushing 303. The bushing 303 is mounted over the lead screw 201 and positioned within the support block 101, below the rotating nut 301. The bushing 303 is coated with lubricant to lubricate the rotating nut 301 and slow down and prevent wear on the support block 101. The bushing 303 and the lead screw 201 have a clearance fit. The rotating nut 301 is threadedly engaged with the lead screw 201 to form a lead screw-nut mechanism. Because the rotating nut 301 is confined within the support block 101 and can only rotate within the support block 101, it cannot move up or down. Therefore, by turning the rotating nut 301, the rotational motion of the rotating nut 301 is converted into the vertical linear motion of the lead screw 201, which in turn drives the linear motion of the pressure block 204, thereby applying and releasing pressure on the overlapping portion of the metal sheet 500 used to prepare the sample. A rotating handle 302 is connected to the rotating nut 301 to facilitate its operation.

[0043] The pressure detection unit 400 is used to detect the pressure applied by the pressurizing unit 200 to the overlapped portion of the metal sheet 500 used to prepare the specimen, thereby facilitating precise control of the pressurizing intensity. The pressure detection unit 400 includes a pressure display 401 and a pressure sensor 402. The pressure display 401 can be placed on the upper plate 10221 of the support 1022 in the support frame 102, and the pressure sensor 402 can be placed between the pressurizing plate 205 and the pressing block 204, or between the pressing block 204 and the topmost metal sheet.

[0044] The usage and principle of this utility model:

[0045] During use, the locking screw 103 is loosened, the rotating handle 302 is raised to leave space for placing the metal sheet 500 for making the sample, and then the locking screw 103 is tightened to lock the lead screw 201 so that the pressurizing unit 200 is temporarily fixed.

[0046] Place the metal sheets with adhesive applied to the overlapping parts through the positioning holes on them and install them on the positioning columns 104 (metal sheets that can make 3 to 8 samples can be placed as needed). After they are properly placed, loosen the locking screw 103 and lower the rotating handle 302 to a state where the boss 2041 at the bottom of the pressure block 204 is close to the overlapping part of the metal sheet 500 used to make the sample. Tighten the locking screw 103 again to fix the pressure unit 200.

[0047] Insert the pressure sensor 402 (such as Figure 3 、 4 As shown) or inserting a pressure sensor 402 between the pressing block 204 and the uppermost metal sheet (as shown) Figure 5 、 6As shown), loosen the locking screw 103 and tighten the rotating handle 302 until the pressure value required for sample curing is displayed on the pressure display 401, and then tighten the locking screw 103 to maintain the pressure at the current pressure value.

[0048] Finally, the connection between the pressure sensor 402 and the pressure display 401 is cut off, and the sample preparation device and the sample are placed at a specified temperature for curing according to the temperature required for curing the tensile shear sample of different types of adhesives.

[0049] After the sample is completely cured, loosen the locking screw 103 , rotate to raise the rotary handle 302 , take out the prepared sample, and return the control unit 300 to its original position.

Claims

1. A device for preparing adhesive tensile shear strength test specimens, characterized in that: include: Support positioning unit, pressurizing unit, control unit and pressure detection unit; The support and positioning unit is used to install and support the pressurizing unit, the control unit and the pressure detection unit, and to place the metal sheet used to make the sample. At the same time, the metal sheet is positioned by cooperating with the axial hole of the metal sheet to ensure the overlap length of the metal sheet and prevent dislocation; The pressurizing unit is used to apply pressure to the overlapping parts of the metal sheets used to prepare the specimens; The control unit is used to control the action of the pressurizing unit; The pressure detection unit is used to detect the pressure applied by the pressurizing unit to the overlapping parts of the metal sheets, which serves as a reference for the control unit to achieve precise control of the pressure applied by the pressurizing unit.

2. The device for preparing adhesive tensile shear strength test specimens according to claim 1, characterized in that: The support and positioning unit includes a support frame consisting of a base plate and a support; the support consists of an upper plate and a side plate, the upper plate is parallel to and located above the base plate, and the side plate is perpendicular to and located on one side of the base plate; two positioning columns and limiting columns are also provided on the base plate, the positioning columns are used to cooperate with the positioning holes on the two metal sheets constituting the sample to position them, and there are two groups of limiting columns, two in each group, which limit the sample therein by cooperating with the side walls of the metal sheet used to make the sample, thereby preventing the metal sheet from shifting when being pressed; a support block is provided on the top of the upper plate, and a locking screw for locking the pressurizing unit is provided on the side wall of the upper plate; The pressurizing unit includes a lead screw, a pressure plate, a pressure block and a pressure plate; the lead screw is vertically arranged, the upper part passes through the upper plate and extends out, the lower part passes through the pressure plate and is connected to the pressure plate, and the side wall is provided with a locking groove that cooperates with the locking screw; the pressure block is arranged below the pressure plate, and a through hole is opened on the pressure block for cooperating with the clearance of the positioning column so that it can pass through; a boss is provided in the middle of the lower surface of the pressure block for applying pressure to the overlapping part of the metal sheet used to make the sample; a mounting cavity for accommodating the pressure plate is reserved between the pressure block and the pressure plate, and the pressure plate is located in the mounting cavity and is fixed to the lead screw by screws; The locking screw is used to lock and unlock the lead screw; The control unit includes a rotating nut that cooperates with the thread of the lead screw. The rotating nut is installed in the support block and can only rotate in the support block but cannot move up and down. By screwing the rotating nut, the movement of the pressure block connected to the lead screw is controlled to achieve pressure and release on the overlapping part of the metal sheet located below the pressure block; The pressure detection unit includes a pressure sensor and a pressure display. The pressure sensor is arranged between the pressure plate and the pressure block. The pressure display is used to display the detection value of the pressure sensor.

3. The device for preparing adhesive tensile shear strength test specimens according to claim 2, characterized in that: The pressurizing unit further comprises a guide post for guiding the pressing block when it moves up and down, so as to ensure that the boss at the bottom of the pressing block does not deviate when applying pressure to the overlapping portion of the metal sheets constituting the sample.

4. The device for preparing adhesive tensile shear strength test specimens according to claim 3, characterized in that: The guide column is vertically arranged, the lower part of the guide column is connected with the pressing block by interference fit, and the upper part passes through the upper plate.

5. The device for preparing adhesive tensile shear strength test specimens according to claim 4, characterized in that: The positioning column and the bottom plate, as well as the limiting column and the bottom plate are connected by interference fit; the support block and the upper plate are connected by welding.

6. The device for preparing adhesive tensile shear strength test specimens according to any one of claims 1 to 5, characterized in that: The control unit further includes a rotating handle connected to the rotating nut.

7. The device for preparing adhesive tensile shear strength test specimens according to claim 6, characterized in that: The control unit further includes a bushing which is sleeved outside the lead screw, located inside the support block and below the rotating nut.

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