Civil Engineering Laboratory Pressure Testing Method and Device

Abstract

The present invention relates to a method and device for pressure testing in a civil engineering laboratory. The pressure testing equipment in the civil engineering laboratory includes a frame, an upper hydraulic lifting seat and a lower hydraulic lifting seat arranged on the frame. Both the upper hydraulic lifting seat and the lower hydraulic lifting seat are driven to lift by hydraulic cylinders. A displacement meter moving device is arranged beside the upper hydraulic lifting seat and the lower hydraulic lifting seat. The displacement meter moving device includes a first base and a second base slidably arranged on the first base. First channel grooves for limiting its movement are arranged on both sides of the first base, and the first base is driven to move by a first electric cylinder; Second channel grooves for limiting its movement are arranged on both sides of the second base on the first base. An installation frame and a first screw rod vertically arranged on the installation frame are arranged on the second base. The first screw rod is driven to rotate by a first motor arranged on the installation frame. There are three sections of threads in the axial direction of the first screw rod, and each section of thread is respectively screwed with a screw sleeve, and a horizontally arranged displacement meter is connected to each screw sleeve.

Description

Technical Field:

[0002] The present invention relates to a method and device for pressure testing in a civil engineering laboratory. Background Art:

[0004] In the pressure test of a cylindrical specimen in civil engineering, the extrusion deformation of the cylindrical specimen is tested to test the deformation of the cylindrical specimen under pressure. In the past, during the test, the deformation test points were fixed at the one-fourth, one-half, and three-fourths positions of the original height of the cylindrical specimen. However, since the height of the cylindrical specimen changes during the pressure test, the test points at the fixed positions cannot truly reflect the deformation of the cylindrical specimen. Summary of the Invention:

[0006] The purpose of the present invention is to provide a method and device for pressure testing in a civil engineering laboratory. The device has a simple structure and reasonable design, which is beneficial to improving the accuracy of the test.

[0007] The pressure testing method for a civil engineering laboratory of the present invention is characterized in that the working steps are as follows:

[0008] (1). The specimen is sent into the specimen positioning seat of the test equipment by a manipulator;

[0009] (2). The lower hydraulic lifting seat supporting the specimen positioning seat in the test equipment is lifted. After the specimen is preliminarily pressed by the upper hydraulic lifting seat and the lower hydraulic lifting seat in the test equipment, the manipulator disengages;

[0010] (3). The displacement meter moving device in the test equipment is adjusted so that the contact head of the displacement meter touches the surface of the specimen; there are three groups of displacement meters on the displacement meter moving device that can be adjusted in three axes, and the contact points of the contact heads of the three groups of displacement meters are respectively aligned with the one-fourth, one-half, and three-fourths positions of the total height in the same vertical plane of the specimen;

[0011] (4). The upper hydraulic lifting seat in the test equipment starts to continuously press down for the test;

[0012] (5). During the process of the upper hydraulic lifting seat continuously pressing down, the contact points of the three groups of displacement meters also decrease accordingly. The descending values of the three contact points from bottom to top are one-fourth, one-half, and three-fourths of the descending value of the upper hydraulic lifting seat, and at the same time, it is ensured that the three contact points are in contact with the surface of the specimen.

[0013] The pressure testing equipment for a civil engineering laboratory according to the present invention is characterized in that the testing equipment includes a frame, an upper hydraulic lifting seat and a lower hydraulic lifting seat arranged on the frame. Both the upper hydraulic lifting seat and the lower hydraulic lifting seat are driven to lift by hydraulic cylinders. A displacement gauge moving device is arranged beside the upper hydraulic lifting seat and the lower hydraulic lifting seat. The displacement gauge moving device includes a first base and a second base slidably arranged on the first base. Two first channels for limiting its movement are arranged on both sides of the first base. The first base is driven to move by a first electric cylinder. Second channels for limiting its movement are arranged on both sides of the first base where the second base is located. An installation frame and a first screw rod vertically arranged on the installation frame are arranged on the second base. The first screw rod is driven to rotate by a first motor arranged on the installation frame. The first screw rod has three sections of threads in its axial direction, and each section of thread is respectively screwed with a screw sleeve. A horizontally arranged displacement gauge is connected to each screw sleeve.

[0014] Further, the first base is a rectangular plate body. The first channel is formed by a bent strip with a cross-section in the shape of "7". Two bent strips in the shape of "7" are arranged on both sides of the first base, that is, to limit the movement of the first base.

[0015] Further, the second base is a rectangular plate body. The second channel is formed by a bent strip with a cross-section in the shape of "7". Two bent strips in the shape of "7" are arranged on both sides of the second base, that is, to limit the movement of the second base.

[0016] Further, the installation frame includes a vertical plate arranged on the second base and a horizontal plate arranged on the upper part of the vertical plate. Bearings for rotatably hinging the first screw rod are installed on the horizontal plate and the second base.

[0017] Further, the pitch ratio of the three sections of threads on the first screw rod from top to bottom is 3:2:1.

[0018] Further, claws for installing and clamping a test piece are arranged on the surface of the lower hydraulic lifting seat. The claws are driven to clamp by an air cylinder or a hydraulic cylinder.

[0019] In the pressure testing method for a civil engineering laboratory of the present invention, during the process of continuously pressing down by the upper hydraulic lifting seat, the contact points of the three groups of displacement gauges also decrease accordingly. The descending values of the three contact points from bottom to top are one-fourth, one-half and three-fourths of the descending value of the upper hydraulic lifting seat. At the same time, it is ensured that the three contact points are in contact with the surface of the test piece, so as to ensure that the test contact points are always opposite to the positions of one-fourth, one-half and three-fourths of the total height within the same vertical plane of the test piece, which is beneficial to improving the accuracy of the test.

[0020] The following further describes the present invention in detail with reference to the drawings and specific embodiments. Description of the Drawings:

[0022] Figure 1 is the front view structural schematic diagram of the present invention;

[0023] Figure 2 , 3 is Figure 1 the partial structural schematic diagram of;

[0024] Figure 4 is the structural schematic diagram of the screw sleeve and the displacement gauge;

[0025] Figure 5 is the top view structural schematic diagram of the first base and the first channel;

[0026] Figure 6 is Figure 5 the side view structural schematic diagram of. Specific embodiments:

[0028] To make the above features and advantages of the present invention more obvious and understandable, specific embodiments are given below and described in detail in conjunction with the accompanying drawings.

[0029] The pressure testing method for civil engineering laboratories of the present invention has the following working steps:

[0030] (1), Send the test piece into the test piece positioning seat of the test equipment through the manipulator;

[0031] (2), Lift the lower hydraulic lifting seat that supports the test piece positioning seat in the test equipment. After the test piece is preliminarily pressed by the upper hydraulic lifting seat and the lower hydraulic lifting seat in the test equipment, the manipulator disengages;

[0032] (3), Adjust the displacement gauge moving device in the test equipment so that the contact head of the displacement gauge touches the surface of the test piece; there are three groups of displacement gauges that can be adjusted in three axes on the displacement gauge moving device, and the contact points of the contact heads of the three groups of displacement gauges are respectively aligned with the positions of one-fourth, one-half, and three-fourths of the total height in the same vertical plane of the test piece;

[0033] (4), The upper hydraulic lifting seat in the test equipment starts to continuously press down for the test;

[0034] (5), During the process of the upper hydraulic lifting seat continuously pressing down, the contact points of the contact heads of the three groups of displacement gauges also decrease accordingly. The descending values of the three contact points from bottom to top are one-fourth, one-half, and three-fourths of the descending value of the upper hydraulic lifting seat, and at the same time, ensure that the three contact points are in contact with the surface of the test piece.

[0035] The pressure testing equipment for civil engineering laboratories of the present invention includes a frame 1, an upper hydraulic lifting seat 2 and a lower hydraulic lifting seat 3 provided on the frame 1. Both the upper hydraulic lifting seat 2 and the lower hydraulic lifting seat 3 are driven to lift by a hydraulic cylinder or a screw-nut-slider mechanism. A displacement gauge moving device 4 is provided beside the upper hydraulic lifting seat 2 and the lower hydraulic lifting seat 3. The displacement gauge moving device 4 includes a first base 5 and a second base 6 that slides on the first base 5. On both sides of the first base 5, there are first channel grooves 7 for limiting its movement, and the first base 5 is driven to move by a first electric cylinder 8. On both sides of the second base 6 on the first base 5, there are second channel grooves 9 for limiting its movement. An installation frame 10 and a first screw rod 11 vertically provided on the installation frame 10 are provided on the second base 6. The first screw rod 11 is driven to rotate by a first motor 12 provided on the installation frame 10. The first screw rod 11 has three sections of threads in its axial direction, namely a first section of thread L1, a second section of thread L2, and a third section of thread L3. Each section of thread is respectively screwed with a screw sleeve 13. A guiding channel groove for limiting the screw sleeve 13 is provided beside the screw rod. A horizontally arranged displacement gauge 14 is connected to each screw sleeve 13. This displacement gauge can be electronic or mechanical. When using an electronic one, data can be collected in real time. When the first motor 12 drives the first screw rod to rotate, the first section of thread L1, the second section of thread L2, and the third section of thread L3 on it drive the screw sleeves on it to lift. Since the pitch ratio of the three sections of threads from top to bottom on the first screw rod is 3:2:1, when the first screw rod rotates one week, the lifting height ratio of the screw sleeves on it is 3:2:1. Thus, it can be ensured that the contact points tested by the displacement gauge 14 are always facing the positions of one-fourth, one-half, and three-fourths of the total height within the same vertical plane of the test piece, which is beneficial to improving the accuracy of the test. For example, the original total height of the test piece is 100 mm, and the height positions of the test contact points of the three displacement gauges from bottom to top are 25 mm, 50 mm, and 75 mm. After starting and being compressed to 90 mm, that is, the upper hydraulic lifting seat 2 descends 10 mm. The descending height values of the test contact points of the three displacement gauges from bottom to top are 10 mm * 0.25 = 2.5 mm, 10 mm * 0.50 = 5 mm, and 10 mm * 0.75 = 7.5 mm. Finally, the height positions of the test contact points of the three displacement gauges from bottom to top are 22.5 mm, 45 mm, and 67.5 mm. These three position values are the positions of one-fourth, one-half, and three-fourths of the total height of 90 mm after compression. Thus, it can be ensured that the contact points tested by the displacement gauge 14 are always facing the positions of one-fourth, one-half, and three-fourths of the total height within the same vertical plane of the test piece, which is beneficial to improving the accuracy of the test.

[0036] Specifically, the above-mentioned first base 5 is a rectangular plate body. The first channel groove 7 is formed by a "7"-shaped bent strip. Two "7"-shaped bent strips are provided on both sides of the first base, that is, the movement of the first base is limited, and both sides of the first base are limited to slide in the channel grooves on both sides.

[0037] Specifically, the second base 6 is a rectangular plate body, and the second channel 9 is formed by a bent strip with a "7"-shaped cross-section. Two "7"-shaped bent strips are provided on both sides of the second base, which realizes the limitation of the movement of the second base, and both sides of the second base are limited to slide in the channels on both sides.

[0038] Specifically, the above-mentioned mounting frame 10 includes a vertical plate 15 provided on the second base and a horizontal plate 16 provided on the upper part of the vertical plate. A bearing 17 for rotatably hinging the first screw 11 is installed on the horizontal plate 16 and the second base 6. The bearing 17 supports the lower end and the upper part of the first screw 11, and this design can provide the stability of the mechanism.

[0039] Furthermore, in order to improve the placement stability of the specimen, a claw 18 for mounting and clamping the specimen K is provided on the surface of the lower hydraulic lifting seat, and the claw 18 can be driven by a cylinder or a hydraulic cylinder to clamp.

[0040] In the process of the pressure test method in the civil engineering laboratory of the present invention, when the upper hydraulic lifting seat continuously presses down, the contact points of the three displacement gauges also decrease accordingly. The descending values of the three contact points from bottom to top are one-fourth, one-half, and three-fourths of the descending value of the upper hydraulic lifting seat. At the same time, it is ensured that the three contact points are in contact with the surface of the specimen, so as to ensure that the test contact points are always facing the positions of one-fourth, one-half, and three-fourths of the total height within the same vertical plane of the specimen, which is beneficial to improving the accuracy of the test.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that it is still possible to modify the specific implementation manners of the present invention or perform equivalent replacements for some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. A pressure testing device for a civil engineering laboratory, characterized in that , The test equipment includes a frame, an upper hydraulic lifting seat and a lower hydraulic lifting seat arranged on the frame. Both the upper hydraulic lifting seat and the lower hydraulic lifting seat are driven to lift by hydraulic cylinders. A displacement gauge moving device is arranged beside the upper hydraulic lifting seat and the lower hydraulic lifting seat. The displacement gauge moving device includes a first base and a second base that slides on the first base. Two side channels for limiting its movement are arranged on both sides of the first base. The first base is driven to move by a first electric cylinder; two side channels for limiting its movement are arranged on both sides of the first base where the second base is located. An installation frame and a first screw rod vertically arranged on the installation frame are arranged on the second base. The first screw rod is driven to rotate by a first motor arranged on the installation frame. There are three sections of threads on the axial direction of the first screw rod, and each section of thread is screwed with a screw sleeve. A horizontally arranged displacement gauge is connected to each screw sleeve; the pitch ratio of the three sections of threads from top to bottom on the first screw rod is 3:2:

1.

2. The civil engineering laboratory pressure testing equipment according to claim 1, characterized in that , The first base is a rectangular plate body. The first channel is formed by a "7"-shaped bent bar. Two "7"-shaped bent bars are arranged on both sides of the first base, so as to limit the movement of the first base.

3. The civil engineering laboratory pressure testing equipment according to claim 1, characterized in that , The second base is a rectangular plate body. The second channel is formed by a "7"-shaped bent bar. Two "7"-shaped bent bars are arranged on both sides of the second base, so as to limit the movement of the second base.

4. The civil engineering laboratory pressure testing equipment according to claim 1, characterized in that , The installation frame includes a vertical plate arranged on the second base and a horizontal plate arranged on the upper part of the vertical plate. A bearing for rotatably hinging the first screw rod is installed on the horizontal plate and the second base.

5. The civil engineering laboratory pressure testing equipment according to claim 1, characterized in that , Claws for installing and clamping the test piece are arranged on the surface of the lower hydraulic lifting seat. The claws are driven to clamp by an air cylinder or a hydraulic cylinder.

6. A pressure testing method for a civil engineering laboratory, using the pressure testing device according to any one of claims 1-5, characterized in that, The working steps are as follows: (1), Send the test piece into the test piece positioning seat of the test equipment through a manipulator; (2), Lift the lower hydraulic lifting seat that supports the test piece positioning seat in the test equipment. After the test piece is preliminarily pressed by the upper hydraulic lifting seat and the lower hydraulic lifting seat in the test equipment, the manipulator disengages; (3), Adjust the displacement gauge moving device in the test equipment so that the contact head of the displacement gauge touches the surface of the test piece; there are three groups of displacement gauges that can be adjusted in three axes on the displacement gauge moving device. The contact points of the contact heads of the three groups of displacement gauges are respectively aligned with the positions of one-fourth, one-half and three-fourths of the total height in the same vertical plane of the test piece; (4), The upper hydraulic lifting seat in the test equipment starts to continuously press down for the test; (5), During the process of the upper hydraulic lifting seat continuously pressing down, the contact points of the contact heads of the three groups of displacement gauges also decrease accordingly. The descending values of the three contact points from bottom to top are one-fourth, one-half and three-fourths of the descending value of the upper hydraulic lifting seat, and at the same time ensure that the three contact points are in contact with the surface of the test piece; the pitch ratio of the three sections of threads from top to bottom on the first screw rod is 3:2:1.

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