Automatic positioning hydraulic clamp device for surface shear test of composite material

Abstract

The utility model discloses an automatic positioning hydraulic clamp device for a surface shear test of a composite material. The automatic positioning hydraulic clamp device is a clamp device which is capable of automatically positioning and clamping, only needs to independently replace a sample and can realize batch test. A hollow clamp is adopted to achieve weight reduction, effective observation of the sample state is achieved, a free assembly type clamp easy to replace is adopted to be matched with different clamp cushion blocks to be compatible with samples of different thicknesses, and a single-side fixed hydraulic pushing and stopping mechanism is adopted to achieve automatic clamping of the samples. Precise centering of a sample is completed by adopting the clamp cushion block with the fixed width and length, one-button simple, convenient and accurate switching of the sample can be achieved only by operating the hydraulic clamp to release and clamp, the replacement time of the test sample is greatly shortened, the clamp is free of loss, bolt torque does not need to be manually hit, the cost is reduced, and the test efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of composite material mechanical property test, especially to a kind of automatic positioning hydraulic fixture device of composite material surface shear test. BACKGROUND

[0002] Composite material surface shear test method mainly includes interlaminar shear test and in-plane shear test. In-plane shear test is to determine the in-plane shear strength, shear modulus and shear stress-strain curve of symmetrically layered fiber reinforced plastic. Current in-plane shear test is mostly carried out by using standard V-shaped notch sample according to standards GB / T 28889-2012, ASTM D7078, etc. It needs to use in-plane shear fixture to complete the collection and analysis of test data on the tensile testing machine. However, the in-plane shear fixture commonly used by current testing institutions mostly uses manual method to fasten the sample with multiple screws and positioning blocks, and needs to install the upper and lower fixtures on the test platform at the same time. This test method needs a long time to replace the sample, the centering and fastening process is complicated, the fixture is heavy and not conducive to operation, and it cannot be compatible with samples of different thickness specifications. Therefore, it is only suitable for small batch testing of single specification sample and cannot realize batch testing and efficient compatibility of different specifications. At the same time, it is easy to cause large sample installation error and the fixture is easy to be damaged due to excessive manual operation. The processing, updating and maintenance cycle of the damaged fixture is long and the cost is high. Therefore, it is necessary to design a device that can automatically clamp and accurately and conveniently replace the sample to shorten the test preparation period. SUMMARY

[0003] The utility model aims at solving the deficiency in prior art, and provides an automatic positioning hydraulic fixture device for composite material surface shear test. It is a fixture device that can automatically position, automatically clamp, replace the sample alone and realize batch testing. The hollow fixture is used to reduce weight and effectively observe the state of the sample. The easily replaceable free assembly fixture is used to match different fixture pads to be compatible with samples of different thickness. The hydraulic push-stop mechanism fixed on one side is used to automatically clamp the sample. The fixture pad with fixed width and length is used to accurately center the sample. Only the hydraulic fixture needs to be released and clamped to realize one-key simple and convenient accurate switching of the sample, which greatly shortens the replacement time of the test sample. The fixture has no loss, and manual bolt torque is not needed, which reduces cost and improves test efficiency.

[0004] To achieve the above object, the utility model provides a technical scheme for: a kind of composite material surface shear test's automatic positioning hydraulic clamp device, including locking pin, locking ring, clamp, clamp fixed block and hydraulic push mechanism;The detachable connection of one end of the locking pin and clamp is formed, the locking ring is sleeved on locking pin and is formed detachable connection with locking pin, the fixed end of the hydraulic push mechanism is connected with clamp, the clamp fixed block has two and is connected with clamp and the telescopic end of hydraulic push mechanism respectively, two clamp fixed blocks are equipped with clamp pad block at opposite inner side, and constitute clamp hydraulic locking system;The clamp hydraulic locking system has two sets of reserved installation position at upper and lower trusses of tensile testing machine respectively, two sets of clamp hydraulic locking system are arranged centrosymmetrically, and the clamp fixed block and hydraulic push mechanism of two sets of clamp hydraulic locking system are one-to-one correspondence, for jointly clamping composite material sample.

[0005] Further, the device includes a limiting washer and a tightening screw;The clamp fixed block is provided with a convex groove, the telescopic end of the clamp and the hydraulic push mechanism is provided with a concave groove matching with the convex groove, the clamp fixed block can be matched with the telescopic end of the clamp and the hydraulic push mechanism respectively, and the limiting washer and the tightening screw are installed at the connection between the clamp fixed block and the telescopic end of the clamp and the hydraulic push mechanism, to realize the fastening connection between the clamp fixed block and the clamp and the telescopic end of the clamp fixed block and the hydraulic push mechanism.

[0006] Further, the surface of the clamp pad block is provided with anti-skid lines.

[0007] Further, the device includes a bolt;The locking pin is provided with a bolt hole for the bolt to pass through, and the bolt passes through the bolt hole of the locking pin and the reserved installation position of the upper and lower trusses of the tensile testing machine, to limit the clamp hydraulic locking system.

[0008] Further, the hydraulic push mechanism is connected with a hydraulic system.

[0009] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0010] 1. The utility model can effectively solve the problems of low efficiency, complicated manual operation process, inaccurate and rigorous test process control, low sample compatibility, long replacement period and high cost of clamp in the field of composite materials.

[0011] 2. The utility model can realize the adaptation and compatibility of sample thickness by setting clamp pad blocks suitable for V-shaped test samples of different thickness specifications, and can realize the compatibility test of samples with a large range of 0.1-15mm by changing the thickness size of the pad block.

[0012] 3. The utility model discloses a fixture fixed block, fixture cushion block are fixed together to the height of V type test sample is realized to the self-centering of V type test sample, and only need to be pushed into the bottom most through the fixture fixed block closely, can complete the double self-centering of length, width, guarantee the precision of sample installation and test accuracy.

[0013] 4. The utility model discloses a hydraulic push stop mechanism drives fixture fixed block one button to realize the clamping and release of sample, and the pressure of hydraulic push stop mechanism is adjustable, can guarantee effective clamping, does not destroy sample. Without manual repeated loading torque, sample installation time is shortened from 15min to 1min, saves time and energy, greatly improves the efficiency of batch testing, and guarantees the accuracy of test data.

[0014] 5. The utility model discloses simple structure, convenient operation, need not to dismount the whole set of fixture, no easily damaged parts, the component has been processed, low in cost, and the upper and lower fixtures are hollowed out, reduce the whole set weight, and increase the observable window, more easily observe the state of clamp block, sample, guarantee the reliability of sample installation. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the structural schematic diagram of the utility model.

[0016] Figure 2 It is the structural section view of the utility model.

[0017] Figure 3 It is the structural schematic diagram of the upper fixture hydraulic locking system.

[0018] Figure 4 It is the structural schematic diagram of the upper fixture.

[0019] Figure 5 It is the schematic diagram of composite material sample. DETAILED DESCRIPTION

[0020] The utility model will be further explained in connection with specific embodiment.

[0021] In the utility model, unless another definite provision and limit, the term "installation", "link", "connection", "fixed" and so on term should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated, can be mechanical connection, also can be electrical connection, can be directly connected, also can be indirectly connected through the intermediate medium, can be the intercommunication of two elements or the interaction of two elements, unless another definite limit. For the ordinary skilled person in the art, the specific meaning of the above-mentioned term in the utility model can be understood according to specific circumstances.

[0022] Example 1

[0023] ReferenceFigures 1 to 4 As shown, the automatic positioning hydraulic clamp device for composite material surface shear test provided by the embodiment comprises an upper locking pin 1, an upper locking ring 2, an upper clamp 3, clamp fixing blocks 6, limiting gaskets 4, tightening screws 5, a hydraulic push-stop mechanism 8, a lower clamp 9, a lower locking ring 10, a lower locking pin 11 and a bolt;

[0024] One end of the upper locking pin 1 is detachably connected with the upper clamp 3, the upper locking ring 2 is sleeved on the upper locking pin 1 and detachably connected with the upper locking pin 1, the hydraulic push-stop mechanism 8 is connected with a hydraulic system, the fixed end of the hydraulic push-stop mechanism 8 is connected with the upper clamp 3, the clamp fixing blocks 6 are two blocks respectively connected with the upper clamp 3 and the telescopic end of the hydraulic push-stop mechanism 8, the clamp fixing blocks 6 are provided with inverted trapezoidal grooves 601, the telescopic end of the upper clamp 3 and the hydraulic push-stop mechanism 8 are both provided with trapezoidal recesses 301 matching the grooves, the clamp fixing blocks 6 can be limited with the upper clamp 3 and the telescopic end of the hydraulic push-stop mechanism 8 respectively, and the limiting gaskets 4 and the tightening screws 5 are installed at the connection between the clamp fixing blocks 6 and the upper clamp 3 and the connection between the clamp fixing blocks 6 and the telescopic end of the hydraulic push-stop mechanism 8, so as to realize the fastening connection between the clamp fixing blocks 6 and the upper clamp 3 and the fastening connection between the clamp fixing blocks 6 and the telescopic end of the hydraulic push-stop mechanism 8, the opposite inner sides of the two clamp fixing blocks 6 are both provided with clamp pads 7, the surface of the clamp pads 7 is provided with anti-skid lines, and the whole constitutes an upper clamp hydraulic locking system;

[0025] One end of the lower locking pin 11 is detachably connected with the lower clamp 9, the lower locking ring 10 is sleeved on the lower locking pin 11 and detachably connected with the lower locking pin 11, the hydraulic push-stop mechanism 8 is communicatively connected with a hydraulic system, the fixed end of the hydraulic push-stop mechanism 8 is connected with the lower clamp 9, the clamp fixing blocks 6 are two blocks respectively connected with the lower clamp 9 and the telescopic end of the hydraulic push-stop mechanism 8, the clamp fixing blocks 6 are provided with inverted trapezoidal grooves, the telescopic end of the lower clamp 9 and the hydraulic push-stop mechanism 8 are both provided with trapezoidal recesses matching the grooves, the clamp fixing blocks 6 can be limited with the lower clamp 9 and the telescopic end of the hydraulic push-stop mechanism 8 respectively, and the limiting gaskets 4 and the tightening screws 5 are installed at the connection between the clamp fixing blocks 6 and the lower clamp 9 and the connection between the clamp fixing blocks 6 and the telescopic end of the hydraulic push-stop mechanism 8, so as to realize the fastening connection between the clamp fixing blocks 6 and the lower clamp 9 and the fastening connection between the clamp fixing blocks 6 and the telescopic end of the hydraulic push-stop mechanism 8, the opposite inner sides of the two clamp fixing blocks 6 are both provided with clamp pads 7, the surface of the clamp pads 7 is provided with anti-skid lines, and the whole constitutes a lower clamp hydraulic locking system;

[0026] The upper and lower clamp hydraulic locking systems are respectively installed at the reserved installation positions of the upper and lower trusses of the tensile testing machine, wherein the upper locking pin 1 and the lower locking pin 11 are respectively provided with a bolt hole through which a bolt passes, the bolt passes through the bolt hole of the upper locking pin 1 and the reserved installation position of the upper truss of the tensile testing machine, the bolt passes through the bolt hole of the lower locking pin 11 and the reserved installation position of the lower truss of the tensile testing machine, so as to limit the upper and lower clamp hydraulic locking systems, and the installation of the upper and lower clamp hydraulic locking systems and the upper and lower trusses of the tensile testing machine is achieved by tightening the upper locking ring 2 and the lower locking ring 10; the upper and lower clamp hydraulic locking systems are arranged in a central symmetry, and the clamp fixing blocks 6 and the hydraulic push-stop mechanisms 8 of the two sets of clamp hydraulic locking systems are one-to-one corresponding, for jointly clamping the composite material sample a.

[0027] Example 2

[0028] The use method of the automatic positioning hydraulic clamp device for composite material face shear test provided in the embodiment is as follows:

[0029] 1. When the device is selected for testing, standard sample pretreatment is first performed, the sample specification is tested, the sample size is confirmed to be standard, the middle grid area is polished, and a test strain gauge is attached, as shown in Figure 5 The oblique shaded area is the clamping area, and the intersecting line shaded area is the working area.

[0030] 2. The upper truss of the tensile testing machine is lifted to a safe distance and does not interfere with the lower clamp installation position.

[0031] Install the upper clamp hydraulic locking system: align the upper locking pin 1 with the installation hole of the upper truss, insert the bolt to prevent falling, tighten the upper locking ring 2, and complete the fastening of the upper locking pin. Connect the upper clamp 3 to the upper locking pin 1 through the threaded hole and tighten it, complete the fastening of the upper clamp 3. Install the hydraulic push-stop mechanism 8 through the clamp reserved hole, connect the hydraulic system, install the clamp fixing block 6 to the upper clamp 3 and the hydraulic push-stop mechanism 8 side through the cooperation of the convex groove and the concave groove, install the clamp pad 7 on the inner side of the clamp fixing block 6, and fix it in the same plane through two limiting washers 4 and four locking screws 5, keep the outermost plane coincident and aligned, and the installation of the upper clamp hydraulic locking system is completed.

[0032] Install the lower clamp hydraulic locking system: the lower locking pin 11 is inserted into the corresponding hole of the lower clamp to prevent movement; the lower locking ring 10 is tightened to complete the fastening of the lower locking pin. The lower clamp 9 is connected to the lower locking pin 11 through the threaded hole and is tightened to complete the fastening of the lower clamp. The hydraulic push-stop mechanism 8 is installed through the clamp reserved hole and is connected to the hydraulic system. The clamp fixing block 6 is installed on the side of the lower clamp 9 and the hydraulic push-stop mechanism 8 through the cooperation of the convex groove and the concave groove. The clamp pad 7 is installed on the inner side of the clamp fixing block 6 and is fixed in the same plane through two limiting washers 4 and four locking screws 5. The outermost plane is kept coincident and aligned, and the installation of the lower clamp hydraulic locking system is completed.

[0033] 3. Sample installation

[0034] The sample with strain gauges is taken out, the hydraulic clamp is opened, the clamp pad 7 of the upper and lower clamps is separated by a space greater than the thickness of the sample, the sample is pushed into the middle of the clamp near the edge of the clamp fixing block 6 of the upper clamp 3, and the sample edge cannot be pushed when it hits the inner wall of the pad edge. Turn off the hydraulic switch to lock the sample with the clamp pad 7 of the upper clamp 3. Operate the equipment to lower the upper clamp hydraulic locking system to the same level as the sample position of the lower clamp hydraulic locking system, turn off the hydraulic switch to lock the clamp pad 7 of the lower clamp 9, and complete the installation of the sample. After the sample installation is completed, the subsequent test is performed.

[0035] 4. Disassembly, secondary sample installation

[0036] After the test, the hydraulic switch of the clamp hydraulic locking system is turned on to release the sample, the upper clamp hydraulic locking system is lifted, the upper clamp hydraulic locking system is released, and the sample is removed. The next sample installation can be performed.

[0037] The above-described embodiments are only preferred embodiments of the present application, and are not intended to limit the scope of the present application. Any changes made in accordance with the shape and principle of the present application should be covered within the scope of protection of the present application.

Claims

1. An automatic positioning hydraulic clamping device for composite material surface shear testing, characterized in that: The system includes a locking pin, a locking ring, a clamp, a clamp fixing block, and a hydraulic push-stop mechanism. One end of the locking pin is detachably connected to the clamp. The locking ring is sleeved on the locking pin and detachably connected to it. The fixed end of the hydraulic push-stop mechanism is connected to the clamp. Two clamp fixing blocks are connected to the telescopic ends of the clamp and the hydraulic push-stop mechanism, respectively. Clamp pads are provided on the inner sides of the two clamp fixing blocks, forming a clamp hydraulic locking system. Two sets of the clamp hydraulic locking system are installed at the reserved installation positions on the upper and lower trusses of the tensile testing machine. The two sets of clamp hydraulic locking systems are centrally symmetrically arranged, and the clamp fixing blocks and hydraulic push-stop mechanisms of the two sets of clamp hydraulic locking systems correspond one-to-one, used to jointly clamp the composite material sample.

2. The automatic positioning hydraulic clamp device for composite material surface shear testing according to claim 1, characterized in that: It includes a limiting washer and a set screw; the clamp fixing block is provided with a protrusion, and the telescopic ends of the clamp and the hydraulic push-stop mechanism are provided with grooves that match the protrusion. The clamp fixing block can cooperate with the telescopic ends of the clamp and the hydraulic push-stop mechanism respectively. The limiting washer and the set screw are installed at the connection between the clamp fixing block and the clamp, and between the clamp fixing block and the telescopic end of the hydraulic push-stop mechanism, to realize the fastening connection between the clamp fixing block and the clamp, and between the clamp fixing block and the telescopic end of the hydraulic push-stop mechanism.

3. The automatic positioning hydraulic clamp device for composite material surface shear testing according to claim 1, characterized in that: The surface of the clamp pad is provided with anti-slip texture.

4. The automatic positioning hydraulic clamp device for composite material surface shear testing according to claim 1, characterized in that: Includes a pin; the locking pin has a pin hole for the pin to pass through, the pin passes through the pin hole of the locking pin and the reserved installation positions of the upper and lower trusses of the tensile testing machine, and is used to realize the limit of the clamp hydraulic locking system.

5. The automatic positioning hydraulic clamp device for composite material surface shear testing according to claim 1, characterized in that: The hydraulic thrust mechanism is connected to a hydraulic system.

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