A specimen centering and positioning mechanism for a compression shear testing machine

Abstract

The present invention relates to the technical field of compression shear testing machines, and specifically to a specimen centering and positioning mechanism for a compression shear testing machine, comprising a frame, a compression shear plate provided on the frame, the compression shear plate being used for placing the specimen, a shear loading mechanism and a vertical loading mechanism provided on the frame, a clamping plate provided at the bottom of the vertical loading mechanism, a plurality of clamping arms hinged on the clamping plate, the clamping arm comprising a fixed cylinder and an abutment member, the fixed cylinder being hingedly arranged on the compression plate, a sliding member being slidably provided on the inner wall of the fixed cylinder, the abutment member slidably cooperates with the sliding member and a first compression spring is connected between the two, the first compression spring causes the abutment member to extend out of the fixed cylinder so as to push the specimen, a locking member is further provided on the fixed cylinder, the locking member being used to stop the sliding member; when the clamping arm moves downward until the locking member contacts the compression shear plate, the locking member releases the blocking of the sliding member, causing the abutment member to shrink into the fixed cylinder so as to no longer push the specimen.

Description

Technical Field

[0001] The invention relates to the technical field of compression shear testing machines, in particular to a sample centering and positioning mechanism for a compression shear testing machine. Background Art

[0002] The compression shear tester is a commonly used material mechanics testing equipment used to test the compression and shear properties of materials. When using it, the sample to be compressed and sheared needs to be placed in the center on the compression shear plate.

[0003] However, the existing compression shear testing machine is not provided with a positioning mechanism, so the staff needs to manually adjust the position of the sample to the center. Since the weight of the sample is usually heavy, the adjustment is time-consuming and laborious, which affects the test efficiency. Summary of the invention

[0004] Based on this, it is necessary to provide a specimen centering positioning mechanism for a compression shear testing machine in order to solve the technical problem that the current compression shear testing machine is not convenient for centering and positioning.

[0005] The above purpose is achieved through the following technical solutions:

[0006] A sample centering and positioning mechanism for a compression shear test machine comprises a frame, a compression shear plate is arranged on the frame, the compression shear plate is used to place the sample, a shear loading mechanism and a vertical loading mechanism are arranged on the frame, the shear loading mechanism is used to apply a horizontal force to the sample, the vertical loading mechanism is used to apply a vertical force to the sample, a clamping plate is arranged at the bottom of the vertical loading mechanism, a plurality of clamping arms are hinged on the clamping plate, the plurality of clamping arms are evenly distributed around the sample, the clamping arm comprises a fixed cylinder and an abutment, the fixed cylinder is hingedly arranged on the clamping plate The abutment can slide along the inner wall of the fixed cylinder to realize the extension and retraction of the clamping arm. The inner wall of the fixed cylinder is also slidably provided with a sliding member. The abutment and the sliding member are slidably matched and a first compression spring is connected between the two. The first compression spring causes the abutment to extend from the fixed cylinder to push the sample. The fixed cylinder is also provided with a locking member, which is used to stop the sliding member. When the clamping arm moves downward until the locking member contacts the shear plate, the locking member releases the blocking of the sliding member, causing the abutment to shrink into the fixed cylinder and no longer push the sample.

[0007] Further, the sliding member includes a sliding rod and a sliding plate fixedly connected, the sliding plate cooperates with a locking member, the abutment member includes an abutment cylinder and a sliding column fixedly connected, the abutment cylinder is used to press the sample, the sliding column is provided with a sliding groove, the sliding groove cooperates with the sliding rod for sliding, and the first compression spring is located between the sliding plate and the sliding column.

[0008] Furthermore, the locking piece is a hook, and a fixing ring is provided on the outer wall of the fixed cylinder. The hook is slidably arranged in the fixing ring. The fixing ring enables the hook to slide in a direction perpendicular to the axis of the fixed cylinder. A top pressure plate is provided at the end of the hook. The top pressure plate is used to contact and cooperate with the shear plate. A second compression spring is provided between the top pressure plate and the fixing ring. A groove penetrating the inner wall of the fixed cylinder is provided on the fixed cylinder. The second compression spring enables the hook to be stuck in the groove, so that the hook and the sliding plate cooperate along the axial direction of the fixed cylinder.

[0009] Further, the abutting tube is a cylindrical tube, and the axial direction of the abutting tube is perpendicular to the axial direction of the fixing tube.

[0010] Furthermore, an opening is provided at one end of the fixing cylinder away from the clamping plate, a first stop edge is provided on the inner wall of the opening, and a second stop edge is provided at one end of the sliding column away from the abutting cylinder, and the second stop edge cooperates with the first stop edge in the sliding direction of the sliding column.

[0011] Furthermore, each fixing cylinder is provided with two locking members, and the two locking members are symmetrically arranged with respect to the axis of the fixing cylinder.

[0012] Furthermore, a plurality of fixing brackets extending in the up-down direction are provided at the bottom of the clamping plate, and each fixing tube is hinged to each fixing bracket respectively; after the fixing brackets are lowered, they correspond to the outer periphery of the shearing plate.

[0013] Furthermore, the shear loading mechanism is a horizontal hydraulic cylinder, a base is provided at the bottom of the frame, a horizontally extending slide rail is provided on the base, a placement table is slidably provided on the slide rail, the shearing plate is fixedly arranged on the placement table, and the output end of the horizontal hydraulic cylinder is fixedly connected to the placement table.

[0014] Furthermore, the vertical loading mechanism is a plurality of vertical hydraulic cylinders, a fixed plate is fixedly provided at the output ends of the plurality of vertical hydraulic cylinders, and the clamping plate is fixedly arranged on the fixed plate.

[0015] Furthermore, the clamping arms are provided with three and the specimen is a circular piece.

[0016] The beneficial effects of the present invention are:

[0017] The specimen centering and positioning mechanism of the compression shear testing machine provided by the present invention can realize automatic centering and positioning of the specimen through a clamping arm arranged on a clamping plate, thus eliminating the need for manual centering adjustment, reducing manual labor and improving test efficiency.

[0018] Secondly, after the sample is compressed, when the shear plate contacts the top pressure plate of the hook, the hook will be disengaged from the slot, and then the hook will no longer block the sliding plate, and the elastic force of the first compression spring will be released, so that the sliding plate will slide along the inner wall of the fixed tube and away from the abutment tube, and then there will be no compression force between the abutment tube and the sample, so as to avoid the abutment tube still exerting pressure on the sample after positioning the sample. As the compression plate continues to move downward, the compression plate and the shear plate clamp the upper and lower sides of the sample, and the clamping arm is pressed by the edge of the shear plate, so that the end of the clamping arm with the abutment tube rotates upward, so that the clamping arm tilts, and the horizontal distance between the abutment tube and the sample increases, which can avoid the abutment tube and the sample from colliding during the test and improve the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the three-dimensional structure of a specimen centering and positioning mechanism of a compression shear testing machine provided by an embodiment of the present invention;

[0020] Figure 2 A side view of a specimen centering and positioning mechanism of a compression shear testing machine provided in one embodiment of the present invention;

[0021] Figure 3 for Figure 2 Middle AA section view (first state schematic);

[0022] Figure 4 for Figure 3 A schematic diagram of a second state;

[0023] Figure 5 for Figure 3 Schematic diagram of the third state;

[0024] Figure 6 A schematic diagram of the structure of a clamping arm in a specimen centering and positioning mechanism of a compression shear testing machine provided by an embodiment of the present invention;

[0025] Figure 7 for Figure 3 A magnified view of the structure at B in the middle;

[0026] Figure 8 for Figure 4 A magnified view of the structure at C in the middle;

[0027] Fig. 9 for Figure 5 Enlarged view of the structure at point D in the middle.

[0028] in:

[0029] 100, shear loading mechanism; 101, horizontal hydraulic cylinder; 102, mounting frame; 200, frame; 201, column; 202, upper beam; 203, base; 204, placing table; 205, slide rail; 206, shear plate; 207, clamping plate; 300, vertical loading mechanism; 400, clamping arm; 401, abutment cylinder; 402, fixing cylinder; 403, hook; 404, sliding rod; 405, sliding column; 406, sliding plate; 407, top pressure plate; 408, fixing ring; 500, specimen. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] like Figures 1 to 9As shown, a sample centering and positioning mechanism for a compression shear test machine provided by an embodiment of the present invention comprises a frame 200, a compression shear plate 206 is provided on the frame 200, the compression shear plate 206 is used to place a sample 500, a shear loading mechanism 100 and a vertical loading mechanism 300 are provided on the frame 200, the shear loading mechanism 100 is used to apply a horizontal force to the sample 500, the vertical loading mechanism 300 is used to apply a vertical force to the sample 500, a clamping plate 207 is provided at the bottom of the vertical loading mechanism 300, a plurality of clamping arms 400 are hinged on the clamping plate 207, the plurality of clamping arms 400 are evenly distributed around the sample 500, and the clamping arm 400 comprises a fixing cylinder 40 2 and abutment, the fixed cylinder 402 is hingedly arranged on the clamping plate 207, the abutment can slide along the inner wall of the fixed cylinder 402 to achieve the extension and retraction of the clamping arm 400, the inner wall of the fixed cylinder 402 is also slidably provided with a sliding member, the abutment and the sliding member are slidably matched and a first compression spring is connected between the two, the first compression spring makes the abutment extend from the fixed cylinder 402 to push the sample 500, the fixed cylinder 402 is also provided with a locking member, the locking member is used to stop the sliding member; when the clamping arm 400 moves downward until the locking member contacts the shearing plate 206, the locking member releases the blocking of the sliding member, so that the abutment shrinks into the fixed cylinder 402 and no longer pushes the sample 500. The frame 200 includes a column 201, the column 201 is provided with an upper crossbeam 202, and the vertical loading mechanism 300 is arranged on the upper crossbeam 202. In this embodiment, the sample 500 is a rubber seismic isolation bearing used on a bridge, and the weight of the sample 500 is relatively large.

[0034] The multiple clamping arms 400 are evenly distributed around the sample 500, so that when the clamping arms 400 move downward, the multiple clamping arms 400 can push the sample 500 so that the sample 500 is located in the center of the multiple clamping arms 400, thereby achieving automatic centering positioning of the sample 500.

[0035] In one embodiment, the sliding member includes a fixedly connected sliding rod 404 and a sliding plate 406, the sliding plate 406 is in blocking cooperation with a locking member, the abutting member includes a fixedly connected abutting cylinder 401 and a sliding column 405, the abutting cylinder 401 is used to press the sample 500, the sliding column 405 is provided with a sliding groove, the sliding groove is in sliding cooperation with the sliding rod 404, and the first compression spring is located between the sliding plate 406 and the sliding column 405. The abutting cylinder 401 is always located outside the fixed cylinder 402. By providing the first compression spring, the first compression spring can be compressed and stored when the abutting cylinder 401 contacts the sample 500.

[0036] In one embodiment, the locking member is a hook 403, which is L-shaped. A fixing ring 408 is provided on the outer wall of the fixed cylinder 402. The hook 403 is slidably arranged in the fixing ring 408. The fixing ring 408 allows the hook 403 to slide in a direction perpendicular to the axis of the fixed cylinder 402. A top pressure plate 407 is provided at the end of the hook 403. The top pressure plate 407 is used to contact and cooperate with the shearing plate 206. A second compression spring is provided between the top pressure plate 407 and the fixing ring 408. A slot penetrating the inner wall of the fixed cylinder 402 is provided on the fixed cylinder 402. The second compression spring allows the hook 403 to be stuck in the slot, so that the hook 403 and the sliding plate 406 are blocked and matched along the axial direction of the fixed cylinder 402. The second compression spring can keep the hook 403 in a blocking and matching state with the sliding plate 406, so as to prevent the abutment from shrinking into the fixed cylinder 402 after contacting the sample 500.

[0037] In one embodiment, the abutting tube 401 is a cylindrical tube, and the axial direction of the abutting tube 401 is perpendicular to the axial direction of the fixing tube 402. The smooth outer surface of the abutting tube 401 is used to press the sample 500, thereby avoiding extrusion damage to the sample 500.

[0038] In one embodiment, the end of the fixed cylinder 402 away from the clamping plate 207 is provided with an opening, and the inner wall of the opening is provided with a first stop edge (not shown in the figure), and the end of the sliding column 405 away from the abutting cylinder 401 is provided with a second stop edge (not shown in the figure), and the second stop edge cooperates with the first stop edge in the sliding direction of the sliding column 405. The first stop edge can be formed by bending the inner wall of the fixed cylinder 402 inwardly, or it can be an annular protrusion fixedly set on the inner wall of the fixed cylinder 402. The second stop edge can be a stopper or a protrusion fixedly set on the outer surface of the sliding column 405.

[0039] In one embodiment, two locking members are provided on each fixed cylinder 402, and the two locking members are symmetrically arranged about the axis of the fixed cylinder 402. In this way, the two locking members have a better blocking effect on the sliding member.

[0040] In one embodiment, a plurality of fixing brackets extending in the up-down direction are provided at the bottom of the pressing plate 207 , and each fixing cylinder 402 is hinged to each fixing bracket respectively; after the fixing brackets are lowered, they correspond to the outer periphery of the shearing plate 206 .

[0041] In one embodiment, the shear loading mechanism 100 is a horizontal hydraulic cylinder 101, a mounting frame 102 is fixedly provided on one side of the frame 200, the horizontal hydraulic cylinder 101 is fixedly set on the mounting frame 102, a base 203 is provided at the bottom of the frame 200, a horizontally extending slide rail 205 is provided on the base 203, a placement table 204 is slidably provided on the slide rail 205, the shear plate 206 is fixedly set on the placement table 204, and the output end of the horizontal hydraulic cylinder 101 is fixedly connected to the placement table 204.

[0042] In one embodiment, the vertical loading mechanism 300 is a plurality of vertical hydraulic cylinders, and a fixed plate is fixedly provided at the output ends of the plurality of vertical hydraulic cylinders, and the clamping plate 207 is fixedly disposed on the fixed plate.

[0043] In one embodiment, three clamping arms 400 are provided, and the sample 500 is a circular piece. In other embodiments, if the sample 500 is a square, four clamping arms 400 may be provided, as long as the sample 500 can be centered.

[0044] In combination with the above embodiments, the use principle and working process of the embodiments of the present invention are as follows:

[0045] First, the sample 500 is placed near the middle of the shear plate 206 by a lifting device, and then the vertical hydraulic cylinder is controlled to drive the clamping plate 207 to move downward, so that the three clamping arms 400 on the clamping plate 207 move downward synchronously, and the three abutment cylinders 401 first contact the upper surface of the sample 500. As the clamping plate 207 moves downward, the abutment cylinders 401 gradually press the outer peripheral surface of the sample 500. When the clamping arms 400 are parallel and in contact with the shear plate 206, the three abutment cylinders 401 push the sample 500 to move to the center position of the three clamping arms 400, thereby realizing automatic centering and positioning of the sample 500. In this way, there is no need for manual centering adjustment, which reduces manpower and improves test efficiency.

[0046] At the same time, the compression between the abutment tube 401 and the outer peripheral surface of the sample 500 will gradually compress the first compression spring. When the shear plate 206 contacts the top pressure plate 407 of the hook 403, the hook 403 will disengage from the slot, and then the hook 403 no longer blocks the sliding plate 406. The elastic force of the first compression spring is released, causing the sliding plate 406 to slide along the inner wall of the fixed tube 402 and away from the abutment tube 401, so that there is no clamping force between the abutment tube 401 and the sample 500, thereby preventing the abutment tube 401 from still exerting pressure on the sample 500 after positioning the sample 500. As the clamping plate 207 continues to move downward, the clamping plate 207 and the shearing plate 206 clamp the upper and lower sides of the sample 500, and the clamping arm 400 is pressed by the edge of the shearing plate 206, so that the end of the clamping arm 400 having the abutment tube 401 rotates upward, so that the clamping arm 400 is tilted, and the horizontal distance between the abutment tube 401 and the sample 500 is increased. This can avoid collision between the abutment tube 401 and the sample 500 during the test, thereby improving the accuracy of the test results.

[0047] Finally, the horizontal hydraulic cylinder 101 is controlled to drive the shear plate 206 to move horizontally back and forth, so that the shear test on the sample 500 can be realized.

[0048] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A specimen centering and positioning mechanism for a compression shear testing machine, characterized in that: The cam is an angularly-shaped member which is adapted to move relative to the sample, and the cam is configured to move the sample toward the cam face, wherein the cam face is provided with a plurality of springs which are adapted to move relative to the sample. The cam is provided with a second spring, and the second spring is provided with a locking plate, and the locking plate is locked in the locking groove, so that the locking plate and the sliding plate are locked in the locking groove.

2. The specimen centering and positioning mechanism for the compression shear testing machine according to claim 1, characterized in that: The abutting cylinder is a cylindrical cylinder, and the axial direction of the abutting cylinder is perpendicular to the axial direction of the fixing cylinder.

3. The specimen centering and positioning mechanism for the compression shear testing machine according to claim 1, characterized in that: An opening is provided at one end of the fixing cylinder away from the clamping plate, a first stop edge is provided on the inner wall of the opening, and a second stop edge is provided at one end of the sliding column away from the abutting cylinder, the second stop edge cooperates with the first stop edge in the sliding direction of the sliding column.

4. The specimen centering and positioning mechanism for the compression shear testing machine according to claim 1, characterized in that: Two locking pieces are arranged on each fixing cylinder, and the two locking pieces are symmetrically arranged about the axis of the fixing cylinder.

5. The specimen centering and positioning mechanism for the compression shear testing machine according to claim 1, characterized in that: A plurality of fixing brackets extending in the up-down direction are arranged at the bottom of the pressing plate, and each fixing cylinder is hinged to each fixing bracket respectively; after the fixing brackets are lowered, they correspond to the outer periphery of the pressing plate.

6. The specimen centering and positioning mechanism for the compression shear testing machine according to claim 1, characterized in that: The shear loading mechanism is a horizontal hydraulic cylinder, a base is provided at the bottom of the frame, a horizontally extending slide rail is provided on the base, a placement table is slidably provided on the slide rail, the shearing plate is fixedly arranged on the placement table, and the output end of the horizontal hydraulic cylinder is fixedly connected to the placement table.

7. The specimen centering and positioning mechanism for the compression shear testing machine according to claim 1, characterized in that: The vertical loading mechanism is a plurality of vertical hydraulic cylinders, and a fixed plate is fixedly provided at the output ends of the plurality of vertical hydraulic cylinders, and the clamping plate is fixedly arranged on the fixed plate.

8. The specimen centering and positioning mechanism for the compression shear testing machine according to claim 1, characterized in that: The clamping arms are provided with three and the specimen is a circular piece.

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