Adjustable stud-free test piece clamp

Abstract

The utility model discloses an adjustable stud-free test piece clamp, which comprises a clamp main body, an adjusting device, a first transmission device and a second transmission device, the clamp main body comprises a fixed part, a movable part and a clamping part, the adjusting device can drive the first transmission device to rotate, and the second transmission device can drive the second transmission device to rotate. The first transmission device can drive the moving part to move in the first direction, the second transmission device can drive the clamping part to move in the second direction, and the adjusting device is controlled to adjust the first transmission device and rotate the second transmission device, so that the moving part and the clamping part of the clamp can be better attached to a test piece; the device can avoid the problem of eccentric tension of the test piece in the tensile test to influence the test result, thereby improving the accuracy of the test result, and has the advantages of adapting to the size and shape of the test piece and avoiding the eccentric tension error of the test result.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of concrete performance test equipment, especially to an adjustable non-anchor test piece clamp. BACKGROUND

[0002] With the development of society and technology, concrete is increasingly widely used in construction engineering, and people's requirements for building material performance are also continuously improving, and thus ultra-high performance concrete (UHPC) is born; the ultra-high performance concrete is the most innovative cement-based engineering material in the past thirty years, realizing a great leap in engineering material performance; the ultra-high performance concrete includes two aspects of ultra-high - ultra-high durability and ultra-high mechanical properties; therefore, UHPC is particularly suitable for use in long-span bridges, blast-resistant structures and thin-walled structures, and in high-abrasion and high-corrosion environments.

[0003] However, in order to ensure the quality of concrete construction, we need to verify whether the performance indicators of concrete meet the specified requirements through tests to ensure engineering quality and safety.

[0004] In T / CBMF 37-2018 / T / CCPA 7-2018 "Ultra-High Performance Concrete Basic Performance and Test Method", the existing non-anchor test piece will cause eccentric tension problems when the tension line of action on the straight rod is parallel to but not coincident with the axis of the rod in the tensile performance test of ultra-high performance concrete; in the prior art, the design of the common clamp does not fully consider the fitting problem of the test piece and the clamp, and it is difficult to effectively avoid the occurrence of eccentric tension, resulting in errors in the final test results. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model lies in providing an adjustable non-anchor test piece clamp that can adjust the clamp during testing, so that the clamp can better fit the test piece, thereby avoiding the problem of eccentric tension and ensuring accurate test results.

[0006] The technical problem to be solved by the utility model lies in providing an adjustable non-anchor test piece clamp that can adjust the clamp during testing, so that the clamp can better fit the test piece, thereby avoiding the problem of eccentric tension and ensuring accurate test results.

[0007] In order to solve the above technical problems, the utility model provides an adjustable non-anchor test piece clamp which comprises a clamp main body, an adjusting device, a first transmission device and a second transmission device; the clamp main body comprises a clamp main body, an adjusting device, a first transmission device and a second transmission device; the clamp main body comprises a fixed part, a moving part and a clamping part, the moving part is arranged at both ends of the fixed part, and one end of the clamping part is connected with one end of the moving part.

[0008] Specifically, the adjusting device is installed on both sides of the fixed part; the first transmission device is installed inside the fixed part, the adjusting device can drive the first transmission device to rotate, the first transmission device is in transmission connection with the moving part, and the first transmission device can drive the moving part to move in the first direction; the second transmission device is installed inside the clamping part, the second transmission device is in transmission connection with the clamping part, and the second transmission device can drive the clamping part to move in the second direction.

[0009] Specifically, the adjusting device is fixedly connected with the first transmission device, the moving part is in sliding connection with the fixed part, and the clamping part is in sliding connection with the moving part.

[0010] Specifically, the adjusting device comprises an adjusting handle and an adjusting rod, the adjusting handle is connected with the adjusting rod perpendicularly, the first transmission device comprises a first screw rod, the adjusting rod is fixedly connected with the first screw rod, one end of the moving part is provided with a first threaded groove, the first threaded groove is in engagement with the first screw rod, and the first screw rod can drive the moving part to move in the first direction relative to the fixed part when rotating.

[0011] Specifically, the second transmission device comprises a second screw rod, one end of the clamping part is provided with a second threaded groove, the second threaded groove is in engagement with the second screw rod, and the second screw rod can drive the clamping part to move in the second direction relative to the moving part when rotating.

[0012] Specifically, the first direction and the second direction are perpendicular to each other, the clamping part is provided with a clamping structure, the clamping structure is in a concave arc shape, and the shape of the clamping structure corresponds to the shape of the test piece.

[0013] Specifically, the surface of the fixed part is provided with a first through part, and the surface of the clamping part is provided with a second through part.

[0014] Specifically, the surfaces of the first transmission device and the second transmission device are provided with scale marks.

[0015] Specifically, the first transmission device is arranged at the first through part, and the second transmission device is arranged at the second through part.

[0016] Specifically, the central axis of the fixed part coincides with the central axis of the clamping part, the moving part is symmetrically installed at two ends of the fixed part, and one end of the clamping part is connected to an end of the moving part away from the fixed part.

[0017] The present application has the following beneficial effects:

[0018] The utility model provides a kind of adjustable no peg test piece clamp, including clamp main body, adjusting device, first transmission device and second transmission device, clamp main body includes fixed part, moving part and engagement part, the adjusting device can drive the rotation of first transmission device, first transmission device can drive the moving part moves in first direction, second transmission device can drive the engagement part moves in second direction, wherein, by controlling adjusting device adjustment first transmission device, rotate second transmission device, the moving part of clamp and engagement part can better adhere test piece, eccentric tensioning problem can be avoided in tensile test of test piece, influence test result, to improve the accuracy of test result, while improve the convenience of operation. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a front view of the utility model a kind of adjustable no peg test piece clamp;

[0020] Figure 2 It is a side view of the utility model a kind of adjustable no peg test piece clamp;

[0021] Figure 3 It is the state diagram when the utility model a kind of adjustable no peg test piece clamp is clamped to test piece;

[0022] Figure 4 It is the state diagram when the first screw rod of the utility model is engaged with first threaded groove or second screw rod is engaged with second threaded groove. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be described clearly and completely in conjunction with the drawings of the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all. In the description of the utility model, it should be understood that the orientation or position relationship indicated by terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, so it cannot be understood as a limitation on the utility model.

[0024] In combination Figure 1 , the utility model provides a kind of adjustable no peg test piece clamp, including clamp main body 1, adjusting device 2, first transmission device 3 and second transmission device 4;Clamp main body 1 includes fixed part 5, moving part 6, engagement part 7, moving part 6 is located at both ends of fixed part 5, and one end of engagement part 7 is connected with one end of moving part 6.

[0025] The adjusting device 2 is installed on both sides of the fixed part 5; the first transmission device 3 is installed inside the fixed part 5, the adjusting device 2 can drive the first transmission device 3 to rotate, the first transmission device 3 is in transmission connection with the moving part 6, and the first transmission device 3 can drive the moving part 6 to move in the first direction; the second transmission device 4 is installed inside the clamping part 7, the second transmission device 4 is in transmission connection with the clamping part 7, and the second transmission device 4 can drive the clamping part 7 to move in the second direction; wherein the adjusting device 2 controls the first transmission device 3, the second transmission device 4 controls the clamping part 7, the first direction is a horizontal direction along the fixed part 5, and the second direction is a vertical direction along the moving part 6; through the mode that the adjusting device 2 is arranged left and right, it is convenient for test personnel to adjust the fitting degree of the test fixture and the concrete test piece in the horizontal direction in the test process.

[0026] The traditional boltless test piece fixture cannot adjust the fitting degree with the concrete test piece in the tensile performance test of the ultra-high performance concrete, so that there is a gap between the concrete test piece and the test fixture, when the vertical tensile force is applied, the central axis of the concrete test piece and the test fixture cannot be completely coincident, eccentric tension problem occurs, and thus the test result has an error; in the adjustable boltless test piece fixture, the adjusting device 2 plays a role in controlling the moving part 6; by rotating the adjusting device 2, the first transmission device 3 is rotated, and the moving part 6 is driven by the first transmission device 3 to slide left and right along the horizontal direction; by rotating the second transmission device 4, the clamping part 7 is driven by the second transmission device 4 to move up and down along the vertical direction; by adjusting the moving part 6 and the clamping part 7, the fitting of the fixture and the concrete test piece is more closely, the eccentric tension phenomenon is avoided, and the test result is more accurate.

[0027] In combination Figure 1 With Figure 4 , the adjusting device 2 is fixedly connected with the first transmission device 3, the moving part 6 is in sliding connection with the fixed part 5, and the clamping part 7 is in sliding connection with the moving part 6; the adjusting device 2 comprises an adjusting handle 22 and an adjusting rod 21, the adjusting handle 22 is in perpendicular connection with the adjusting rod 21, the first transmission device 3 comprises a first screw rod 31, and the adjusting rod 21 is fixedly connected with the first screw rod 31; by arranging the adjusting handle 22 and the adjusting rod 21, it is more labor-saving and convenient for test personnel to rotate and adjust the first transmission device 2; the moving part 6 is conveniently slid left and right, and the clamping part 7 is conveniently slid up and down in the mode of sliding connection.

[0028] One end of the moving part 6 is provided with a first threaded groove 71, which is engaged with the first screw rod 31. When the first screw rod 31 rotates, it can drive the moving part 6 to move in the first direction relative to the fixed part. The second transmission device 4 includes a second screw rod 41. One end of the clamping part 7 is provided with a second threaded groove 72, which is engaged with the second screw rod 41. When the second screw rod 41 rotates, it can drive the clamping part 7 to move in the second direction relative to the moving part 6. It should be noted that the clamp can also be driven by a pneumatic or hydraulic device, but the threaded engagement transmission has the advantages of low cost, convenient maintenance, and convenient operation compared with pneumatic or hydraulic transmission. By setting the threaded groove at one end of the clamping part 7 and the moving part 6, and cooperating with the threaded rod engagement transmission, when the rotary adjusting device 2 and the second transmission device 4 are rotated, the moving part 6 and the clamping part 7 are further driven to slide, which is convenient and fast.

[0029] In combination Figure 1 With Figure 3 , the first direction and the second direction are perpendicular to each other. The clamping part 7 is provided with a clamping structure 73, which is in the shape of an arc. The shape of the clamping structure 73 corresponds to the shape of the test piece. The central axis of the fixed part 5 coincides with the central axis of the clamping part 7. By setting the arc-shaped clamping structure 73, the test fixture and the inner concave structure of the concrete test piece are more closely matched, and the central axis of the concrete test piece will not be offset. The non-coincidence of the central axes of the test piece and the fixture is one of the reasons for the eccentric stretching phenomenon of the concrete test piece. When the central axes of the clamping part 7, the moving part 6 and the concrete test piece coincide, the eccentric stretching phenomenon can be avoided, and the test result is more accurate.

[0030] In combination Figure 1 , the surface of the fixed part 5 is provided with a first through hole (not shown), and the surface of the clamping part 7 is provided with a second through hole (not shown). The surfaces of the first transmission device 3 and the second transmission device 4 are provided with scale marks. The first transmission device 3 is arranged at the first through hole, and the second transmission device 4 is arranged at the second through hole. By setting scale marks or scale lines on the surfaces of the first transmission device 3 and the second transmission device 4, and by designing through holes on the surfaces of the clamping part 7 and the fixed part 5, the test personnel can observe the scale lines during the test process, making the adjustment more convenient and accurate.

[0031] In combination Figure 1 With Figure 3 , the moving part 6 is symmetrically installed at both ends of the fixed part 5, and one end of the clamping part 7 is connected to the end of the moving part 6 away from the fixed part 5. By symmetrically arranging the moving part 6, the two sides of the concrete test piece are uniformly stressed, and the central axes of the test piece and the fixture always coincide.

[0032] The working principle of the embodiment is as follows: the first transmission device 3 is controlled to rotate through the rotation adjusting device 2, the first screw rod 31 in the first transmission device 3 is engagedly connected with the threaded groove at one end of the moving part 6, the moving part 6 is driven by the first transmission device 3 to slide in the first direction, so that the adjusting device 2 adjusts the moving part 6; the second transmission device 4 is rotated, the second screw rod 41 in the second transmission device 4 is engagedly connected with the threaded groove at one end of the clamping part 7, the clamping part 7 is driven by the second transmission device 4 to slide in the second direction, and the clamping part 7 is adjusted from two directions in cooperation with the sliding of the moving part 6 in the first direction, so that the clamping part 7 can be adjusted from two degrees of freedom according to the shape of the test piece, and therefore the central axis of the test piece can be adapted to the greatest extent, so that the function of adjusting the fitting degree is realized.

[0033] The above only discloses a preferred embodiment of the utility model, and of course cannot limit the scope of the utility model, so equivalent changes made according to the utility model claims still belong to the scope covered by the utility model.

Claims

1. An adjustable pinless specimen holder characterized by, Including clamp body, adjusting device, first transmission device and second transmission device;The clamp body includes fixed part, moving part and clamping part, the moving part is equipped in both ends of the fixed part, one end of the clamping part is connected with one end of the moving part; The adjusting device is installed on both sides of the fixed part, the first transmission device is installed in the fixed part, the adjusting device can drive the first transmission device to rotate, the first transmission device is in transmission connection with the moving part, and the first transmission device can drive the moving part to move in the first direction;The second transmission device is installed in the clamping part, the second transmission device is in transmission connection with the clamping part, and the second transmission device can drive the clamping part to move in the second direction.

2. The adjustable pinless specimen clamp of claim 1, wherein, The adjusting device is fixedly connected with the first transmission device, the moving part is in sliding connection with the fixed part, and the clamping part is in sliding connection with the moving part.

3. The adjustable pinless specimen clamp of claim 1, wherein, The adjusting device includes adjusting handle and adjusting rod, the adjusting handle is connected with the adjusting rod perpendicularly, the first transmission device includes first screw rod, the adjusting rod is fixedly connected with the first screw rod, one end of the moving part is provided with first screw groove, the first screw groove is engaged with the first screw rod, and the first screw rod can drive the moving part to move in the first direction relative to the fixed part when rotating.

4. The adjustable pinless specimen clamp of claim 1, wherein, The second transmission device includes second screw rod, one end of the clamping part is provided with second screw groove, the second screw groove is engaged with the second screw rod, and the second screw rod can drive the clamping part to move in the second direction relative to the moving part when rotating.

5. The adjustable pinless specimen clamp of claim 1, wherein, The first direction and the second direction are perpendicular to each other, the clamping part is provided with clamping structure, the clamping structure is in concave arc shape, and the shape of the clamping structure corresponds to the shape of the test piece.

6. The adjustable pinless specimen clamp of claim 1, wherein, The surface of the fixed part is provided with first through part, and the surface of the clamping part is provided with second through part.

7. The adjustable pinless specimen clamp of claim 6, wherein, The surface of the first transmission device and the second transmission device is provided with scale mark.

8. The adjustable pinless specimen clamp of claim 7, wherein, The first transmission device is arranged at the first through part, and the second transmission device is arranged at the second through part.

9. The adjustable pinless specimen clamp of claim 5, wherein, The central axis of the fixed part coincides with the central axis of the clamping part, the moving part is symmetrically installed on both ends of the fixed part, and one end of the clamping part is connected to one end of the moving part away from the fixed part.

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