Pressure testing machine and compressive strength determination test piece centering and positioning device thereof

Abstract

The utility model discloses a pressure testing machine and a centering and positioning device for a compressive strength measurement test piece thereof. The centering and positioning device comprises a lower bearing plate and a positioning mechanism, the lower bearing plate is provided with a bearing surface, and the positioning mechanism comprises a first positioning block and a second positioning block. The first positioning block is movably installed on the pressure-bearing surface, the first positioning block is provided with a first positioning surface used for being attached to the side wall of a test piece to be measured, the second positioning block is movably installed on the pressure-bearing surface, and the second positioning block is provided with a second positioning surface used for being attached to the side wall of the test piece to be measured. Wherein the moving direction of the first positioning block is perpendicular to the moving direction of the second positioning block, and the first positioning surface and the second positioning surface are attached to different side walls of the test piece to be measured. According to the compression testing machine and the compressive strength measurement test piece centering and positioning device thereof, centering and positioning of the measurement test piece can be achieved, an operator does not need to observe centering or not with naked eyes, and the test detection efficiency and the data result accuracy are greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to civil engineering technical field, concretely relates to a compression testing machine and compressive strength determination test piece centering positioning device. BACKGROUND

[0002] The compressive strength is an important technical index for evaluating the quality, and the compressive strength test is widely used in civil engineering such as building, water conservancy, road and bridge, railway, port and tunnel, and the compressive strength test quantity of concrete and mortar test blocks in a test room of an inspection and detection institution or project site reaches dozens or even hundreds a day.

[0003] The compressive strength of concrete and mortar is usually tested by a compression testing machine. The national standard GB / T50081-2019 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete" stipulates that the compressive strength test block of concrete is a cube, and the side length can be 100mm or 150mm, and there are three blocks in each group. The national standard GB 50203-2011 "Code for Acceptance of Construction Quality of Masonry Structures" stipulates that the compressive strength test block of mortar is a cube, and the side length is 70.7mm, and there are three blocks in each group.

[0004] When testing the compressive strength, two opposite sides (non-molding surfaces) of the cube test piece are required to be used as the compression surface, and the center of the test piece must be coaxial with the center of the lower compression plate of the compression testing machine, that is, the test piece is subjected to axial compression, and if the centering is not accurate, the test piece will be subjected to eccentric compression, which will significantly reduce the compressive strength value of the test piece and cause significant deviation of the test strength value.

[0005] Generally, concentric circles or cross lines are marked on the lower compression plate of the compression testing machine to help the test and detection personnel to judge whether the test piece is centered during testing. If the four vertices of the cube test piece on the contact surface of the lower compression plate are on the same circle or on the cross lines, it indicates that the test piece is centered, otherwise it should be adjusted. However, this method requires the test personnel to carefully distinguish whether the test piece is in the centered state by naked eye, which is greatly affected by the operation proficiency, attention degree and observation ability of the test and detection personnel. When the number of test pieces to be tested is large, the operation personnel have weak sense of responsibility and weak naked eye observation ability, the test pieces are often subjected to eccentric compression and damage, the test data is inaccurate and has large dispersion, and even the test results cannot be evaluated. INVENTION CONTENTS

[0006] Therefore, it is necessary to provide a compression testing machine and a compressive strength determination test piece centering positioning device for the existing compression testing machine and the inconvenient centering of the test piece.

[0007] A compressive strength determination test piece centering positioning device comprises:

[0008] a lower compression plate having a compression surface; and

[0009] The positioning mechanism comprises a first positioning block and a second positioning block, the first positioning block is movably installed on the pressure receiving surface, the first positioning block is provided with a first positioning surface for abutting with the side wall of the test piece, the second positioning block is movably installed on the pressure receiving surface, and the second positioning block is provided with a second positioning surface for abutting with the side wall of the test piece.

[0010] The moving direction of the first positioning block is perpendicular to the moving direction of the second positioning block, and the first positioning surface and the second positioning surface abut different side walls of the test piece.

[0011] In one of the embodiments, the pressure receiving surface is provided with a first mounting hole, the first positioning block is provided with a plurality of groups of first fixing holes, the plurality of groups of first fixing holes are arranged at intervals, and a first fastener is selectively screwed into the first mounting hole through the first fixing hole.

[0012] In one of the embodiments, the pressure receiving surface is provided with a second mounting hole, the second positioning block is provided with a plurality of groups of second fixing holes, the plurality of groups of second fixing holes are arranged at intervals, and a second fastener is selectively screwed into the second mounting hole through the second fixing hole.

[0013] In one of the embodiments, the number of groups of the first fixing holes is the same as the number of groups of the second fixing holes, and the first fixing holes and the second fixing holes are arranged at the same interval.

[0014] In one of the embodiments, the first fixing holes and the second fixing holes are each arranged at three groups, the number of first fixing holes in each group is 2, and the number of second fixing holes in each group is 2.

[0015] In one of the embodiments, the first mounting hole and the second mounting hole are arranged at the same distance from the center of the lower pressure receiving plate.

[0016] In one of the embodiments, the first positioning surface is provided with a first tooth block, and the surface of the first tooth block facing the test piece is smaller than the area of the first positioning surface.

[0017] In one of the embodiments, the second positioning surface is provided with a second tooth block, and the surface of the second tooth block facing the test piece is smaller than the area of the second positioning surface.

[0018] In one of the embodiments, the first positioning block and the second positioning block are made of stainless steel.

[0019] A compression testing machine comprises:

[0020] The centering and positioning device for the compression strength test piece according to any one of the above.

[0021] The pressure testing machine and the centering positioning device for the compressive strength test piece can match the size specification of the compressive strength test piece of the concrete or the mortar by adjusting the positions of the first positioning block and the second positioning block during the test, and then the test piece is placed on the pressure receiving surface of the lower pressure receiving plate, and the side wall of the test piece is tightly attached to the first positioning surface and the second positioning surface, so that the centering positioning of the test piece is realized, and the operator no longer needs to observe whether the centering is achieved by naked eyes, and the efficiency of the test detection and the accuracy of the data results are greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present application, the drawings used in the specific embodiments will be briefly introduced. In all the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0023] Figure 1 It is a top view of the centering positioning device for the compressive strength test piece in an embodiment;

[0024] Figure 2 It is a side view of the centering positioning device for the compressive strength test piece shown in the figure; Figure 1

[0025] Figure 3 It is a structure diagram of the lower pressure receiving plate; Figure 1

[0026] Figure 4 It is a sectional view of A-A line in the figure; Figure 1

[0027] Figure 5 It is a sectional view of B-B line in the figure. Figure 1

[0028] Reference signs:

[0029] 1-test piece, 10-lower pressure receiving plate, 11-pressure receiving surface, 12-first mounting hole, 13-second mounting hole, 21-first positioning block, 211-first positioning surface, 212-first fixing hole, 213-first fastener, 214-first tooth block, 22-second positioning block, 221-second positioning surface, 222-second fixing hole, 223-second fastener, 224-second tooth block. DETAILED DESCRIPTION

[0030] ​​​​In order to make the above objectives, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different manners other than those described herein, and it is to be understood that similar modifications of the present application can be effected without departing from the spirit and scope of the present application. Therefore, the present application is not limited to the specific implementation disclosed below.

[0031] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. As used herein the terms "vertical", "horizontal", "left", "right" and similar expressions are used for the purpose of illustration only and are not intended to be limiting.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0033] The pressure testing machine in an embodiment comprises a compression strength test piece centering positioning device as shown in the drawings, which is used to realize the rapid centering positioning of the compression strength test pieces of different specifications and sizes of concrete and mortar. Specifically, the compression strength test piece centering positioning device comprises a lower compression plate 10 and a positioning mechanism. Figure 1

[0034] Please refer to Figure 2 The lower compression plate 10 is used to bear the test piece 1, and the lower compression plate 10 has a compression surface 11, and the test piece 1 is placed on the compression surface 11 during the test. In an embodiment, the lower compression plate 10 is circular, and the center of the lower compression plate 10 is the position that needs to be centered by the test piece 1.

[0035] The positioning mechanism is installed on the compression surface 11 of the lower compression plate 10, and the positioning mechanism comprises a first positioning block 21 and a second positioning block 22. The first positioning block 21 is movably installed on the compression surface 11, and the first positioning block 21 is provided with a first positioning surface 211 used to abut against the side wall of the test piece 1. The second positioning block 22 is movably installed on the compression surface 11, and the second positioning block 22 is provided with a second positioning surface 221 used to abut against the test piece 1. The moving direction of the first positioning block 21 is perpendicular to the moving direction of the second positioning block 22, and the first positioning surface 211 and the second positioning surface 221 abut against different side walls of the test piece 1.

[0036] ​In the test, according to the size of the test piece 1, the positions of the first positioning block 21 and the second positioning block 22 on the pressure surface 11 are adjusted, and the first positioning block 21 and the second positioning block 22 are arranged at the same distance from the center of the lower pressure plate 10, that is, the first positioning block 21 and the second positioning block 22 are arranged on the circumference of the circle with the center of the lower pressure plate 10 as the center. Then, the test piece 1 is placed on the pressure surface 11 of the lower pressure plate 10, and the side wall of the test piece 1 is fitted with the first positioning surface 211 and the second positioning surface 221, so that the test piece 1 is centered and positioned. After positioning, the upper pressure plate is adjusted to measure the compressive strength of the test piece 1.

[0037] In an embodiment, the test piece 1 can be a concrete block or a mortar block, and the test piece 1 is rectangular. The angle between the first positioning block 21 and the second positioning block 22 is 90°, and the first positioning surface 211 and the second positioning surface 221 fit the adjacent two side walls of the test piece 1. Of course, in other embodiments, the angle of the first positioning block 21 and the second positioning block 22 can change with the change of the appearance of the test piece 1.

[0038] Please refer to Figure 3 and Figure 4 In an embodiment, the pressure surface 11 is provided with a first mounting hole 12, and the first positioning block 21 is provided with a plurality of first fixing holes 212, which are arranged at intervals. The first fastener 213 is selectively screwed into the first mounting hole 12 through the first fixing hole 212, so as to mount the first positioning block 21 on the pressure surface 11. By adjusting the different insertion of the first fastener 213 into the first fixing hole 212, the position of the first positioning block 21 on the pressure surface 11 is adjusted, so that the first positioning block 21 is movably mounted on the pressure surface 11.

[0039] Please refer to Figure 5 In an embodiment, the pressure surface 11 is provided with a second mounting hole 13, and the second positioning block 22 is provided with a plurality of second fixing holes 222, which are arranged at intervals. The second fastener 223 is selectively screwed into the second mounting hole 13 through the second fixing hole 222, so as to mount the second positioning block 22 on the pressure surface 11. By adjusting the different insertion of the second fastener 223 into the second fixing hole 222, the position of the second positioning block 22 on the pressure surface 11 is adjusted, so that the second positioning block 22 is movably mounted on the pressure surface 11.

[0040] It can be understood that in other embodiments, the movable installation of the first positioning block 21 and the second positioning block 22 on the pressure surface 11 can also be implemented in other ways, for example, a waist-shaped hole can be formed on the first positioning block 21 and the second positioning block 22, and a bolt is threadedly connected in the mounting hole after penetrating through the waist-shaped hole, and the position adjustment of the first positioning block 21 and the second positioning block 22 is realized by the tightness of the bolt.

[0041] In an embodiment, the number of groups of the first fixing holes 212 and the second fixing holes 222 is the same, and the spacing distance of the first fixing holes 212 and the second fixing holes 222 is the same, that is, the hole positions of the first fixing holes 212 and the second fixing holes are completely the same. At the same time, the distance from the first mounting hole 12 and the second mounting hole 13 to the center of the lower pressure plate 10 is the same. Therefore, after the first positioning block 21 and the second positioning block 22 are installed in the same hole position, the distance from the first positioning surface 211 and the second positioning surface 221 to the center of the lower pressure plate 10 can be ensured to be the same.

[0042] Specifically, the first fixing holes 212 and the second fixing holes 222 are each spaced apart by three groups, each group of the first fixing holes 212 has two first fixing holes 212, and the first mounting hole 12 is correspondingly provided with two first mounting holes 12. Each group of the second fixing holes 222 has two second fixing holes 222, and the second mounting hole 13 is correspondingly provided with two second mounting holes 13. Among them, the hole position center distance of each group of the first fixing holes 212 is completely consistent, and the hole position center distance of each group of the second fixing holes 222 is completely consistent, thereby ensuring that the first positioning block 21 and the second positioning block 22 can be normally installed.

[0043] In an embodiment, the first positioning block 21 and the second positioning block 22 are made of stainless steel and are machined, with a surface flatness tolerance of 0.04mm, a surface hardness of not less than 55HRC, and a hardening layer thickness of about 5mm. The first fastener 213 and the second fastener 223 are screws, and the first mounting hole 12 and the second mounting hole 13 are designed with threads. The screw adopts a high-precision thread manually screwed, and is not disassembled with a tool, but manually disassembled, which is convenient to operate.

[0044] In an embodiment, the first positioning surface 211 is provided with a first tooth block 214, and the surface of the first tooth block 214 facing the surface of the test piece 1 is smaller than the area of the first positioning surface 211. The second positioning surface 221 is provided with a second tooth block 224, and the surface of the second tooth block 224 facing the surface of the test piece 1 is smaller than the area of the second positioning surface 221. Among them, since the surface of the first tooth block 214 and the second tooth block 224 facing the surface of the test piece 1 requires high flatness, the area of the first tooth block 214 and the second tooth block 224 is small, and therefore the processing requirement of the high flatness area is small, which can reduce the processing difficulty and cost.

[0045] In an embodiment, the first positioning block 21 and the second positioning block 22 are cuboids, and the size specifications of the first positioning block 21 and the second positioning block 22 are: length 100 mm, width 40 mm, and thickness 30 mm. The size specifications of the first tooth block 214 and the second tooth block 224 are the same, and the length, width, and height dimensions are 10 mm x 10 mm x 10 mm.

[0046] The compression testing machine and the centering and positioning device for the compression strength test piece are used in the test. According to the size specifications of the test piece 1, the mounting hole positions of the first positioning block 21 and the second positioning block 22 are determined, and then the first positioning block 21 and the second positioning block 22 are mounted on the lower pressure plate 10. Then, the test piece 1 is placed on the pressure surface 11 of the lower pressure plate 10, so that the side wall of the test piece 1 is tightly attached to the first positioning surface 211 and the second positioning surface 221, thereby achieving the centering and positioning of the test piece 1. The operator no longer needs to observe whether the centering and positioning is correct by the naked eye, greatly improving the efficiency of the test and the accuracy of the data results. The positions of the first positioning block 21 and the second positioning block 22 can be adjusted, so that the compression strength of test pieces 1 of different specifications can be determined, and the range of use is wider.

[0047] The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent substitutions for part or all of the technical features. These modifications or substitutions do not change the essence of the corresponding technical solutions out of the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application.

Claims

1. A device for centering a test specimen for compressive strength testing, comprising: The utility model relates to a compression strength test piece centering and positioning device, comprising: a lower pressure plate with a pressure surface; and a positioning mechanism comprising a first positioning block and a second positioning block, the first positioning block being movably mounted on the pressure surface, the first positioning block being provided with a first positioning surface for abutting against a side wall of a test piece, the second positioning block being movably mounted on the pressure surface, the second positioning block being provided with a second positioning surface for abutting against the side wall of the test piece; wherein the moving direction of the first positioning block is perpendicular to the moving direction of the second positioning block, and the first positioning surface and the second positioning surface abut against different side walls of the test piece.

2. The apparatus of claim 1, wherein, The pressure surface is provided with a first mounting hole, the first positioning block is provided with a plurality of groups of first fixing holes, the groups of first fixing holes being spaced apart, and a first fastener is selectively screwed into the first mounting hole through the first fixing holes.

3. The apparatus of claim 2, wherein, The pressure surface is provided with a second mounting hole, the second positioning block is provided with a plurality of groups of second fixing holes, the groups of second fixing holes being spaced apart, and a second fastener is selectively screwed into the second mounting hole through the second fixing holes.

4. The apparatus of claim 3, wherein, The number of groups of first fixing holes is the same as the number of groups of second fixing holes, and the spacing distance of the first fixing holes and the second fixing holes is the same.

5. The apparatus of claim 4, wherein, The first fixing holes and the second fixing holes are each spaced apart into three groups, each group of first fixing holes having two first fixing holes, and each group of second fixing holes having two second fixing holes.

6. The apparatus of claim 3, wherein, The first mounting hole and the second mounting hole are the same distance from the center of the lower pressure plate.

7. The apparatus of claim 1 wherein, The first positioning surface is provided with a first tooth block, and the surface of the first tooth block facing the test piece is smaller than the area of the first positioning surface.

8. The apparatus of claim 1 wherein, The second positioning surface is provided with a second tooth block, and the surface of the second tooth block facing the test piece is smaller than the area of the second positioning surface.

9. The apparatus of claim 1 wherein, The first positioning block and the second positioning block are each made of stainless steel.

10. A compression testing machine characterized by, The utility model relates to a compression strength test piece centering and positioning device. The compression strength test piece centering and positioning device according to any one of claims 1-9.

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