CN103196738B - For the accurate compressing apparatus and method of test specimen in analog material process for preparation - Google Patents

Abstract

The invention relates to a device and method for precise pressing and forming of test pieces in the preparation process of similar materials, including a material forming mold and a precise pressure application control system. The material forming mold can be disassembled and assembled, which is convenient for the painting of the release agent in the early stage and the demoulding of the test piece in the later stage. The precise pressure control system can display the pressure and set the pressure to be applied to press the test piece. The invention studies the precise pressing system of the test piece in the preparation process of similar materials used in the geomechanics model test, and solves the problem of uncontrollable pressure application and material consumption in the traditional manual process of making the test piece. In the process of making similar material specimens, the application of pressure can be accurately controlled, so that the quality error of the specimens is reduced, and the difference in mechanical parameters caused by the production problems of different specimens is reduced, and the experimental data obtained are better. Guide the deployment of similar materials.

Description

Apparatus and method for precise compression molding of test pieces in the process of preparing similar materials

technical field

The invention relates to a model test technology, in particular to a device and method for precise pressing and forming of test pieces in the preparation process of similar materials.

Background technique

With the development of my country's economy, science and technology, and the rapid development of transportation, the development and utilization of underground space has increasingly reflected huge economic and social benefits. The development and utilization of underground space in my country is developing in a modern and scientific direction. With the continuous increase in the number and scale of underground projects, many scholars are studying the optimization of underground engineering design and construction methods in various ways, and exploring the mechanical laws of the construction process. Among them, model test is one of the effective methods to study the law of underground engineering construction process.

The model test is based on the similarity theory, transforming the actual project into an indoor model for test simulation. However, in the current underground engineering model experiments, there are some weaknesses in the production of test pieces in the process of preparing similar materials. Therefore, the compactness of the prepared test pieces is not uniform, which leads to a large difference in the mechanical test parameters between the test pieces with the same ratio, and it is difficult to obtain accurate data to guide the deployment of materials, which exacerbates the difficulty of material preparation. .

Contents of the invention

The purpose of the present invention is to overcome the deficiency of above-mentioned existing model test technology, provide a kind of simple to operate, easy to use, and very practical device and the device that are used for the precise compression molding of sample in the similar material preparation process that are used for model test The method can accurately control the amount of material used in the production process of the test piece, accurately grasp the compaction pressure of the material, so that the density of the test piece can be accurately controlled, and the statistical mechanical property data of the test piece can better reflect the quality of the material. It is convenient to grasp the material parameters, better adjust the mechanical properties of the material, and lay a good material foundation for the success of the model test.

To achieve the above object, the present invention adopts the following technical solutions:

A device for precise pressing and molding of test pieces in the process of preparing similar materials, including a material forming mold and a precise pressure control system, wherein the material forming mold is a detachable structure, which is placed in the precise pressure control system, controlled by precise The pressure application control system sets the pressure to be applied to compress the specimen.

The material forming mold is precisely processed by high-strength steel, including side mold a and side mold b, both of which are installed on the mold base, the mold hoop is installed on the top, and the mold top cover is installed in the mold hoop.

The precise pressure application control system includes a lower reaction force panel, and a reaction force frame pillar is arranged around the lower reaction force panel, and the whole has a certain rigidity; the upper reaction force panel is installed on the reaction force pillar; the inner top surface of the upper reaction force panel A hydraulic cylinder is installed, a pressure sensor is installed on the hydraulic cylinder, the pressure sensor is connected with a control system, and the control system controls the hydraulic cylinder.

A method for accurately pressing and forming a test piece in the preparation process of similar materials, comprising the following steps:

A. Disassemble the material forming mold and apply the release agent evenly, and then assemble it;

B. Weigh the material according to the proportion and mix it evenly, and pour it into the material forming mold;

C. Place the mold filled with materials in the specified position of the precise pressure application control system, and control the precise pressure application control system to compact the test piece according to the specified pressure;

D. Control the hydraulic cylinder to rise, then take out the material forming mold, slowly remove the material forming mold according to the steps, take out the test piece, and put it in the designated ventilation position to dry;

E. Repeat this until a sufficient number of test pieces are obtained.

According to the needs of practical application, the present invention makes improvements on the basis of analyzing the shortcomings and deficiencies in the similar material preparation process of previous model tests, so as to make the test pieces more accurate. Weigh the material according to the ratio and stir evenly, put it into the assembled mold after painting the release agent, put the top plug, and then place it at the designated position in the middle of the precise pressure control device, start the device to set the compaction pressure , constant pressure on the mold specimen for a certain period of time. Then control the pressurized oil cylinder to rise, take out the mold for demoulding, take out the prepared test piece and put it in a ventilated place to dry. Repeat this until a sufficient number of test pieces are obtained.

The invention studies the precise pressing system of the test piece in the preparation process of similar materials used in the geomechanics model test, and solves the problem of uncontrollable pressure application and material consumption in the traditional manual process of making the test piece. In the process of making similar material specimens, the application of pressure can be accurately controlled, so that the quality error of the specimens is reduced, and the difference in mechanical parameters caused by the production problems of different specimens is reduced, and the experimental data obtained are better. Guide the deployment of similar materials.

The invention solves the problems of uneven compaction pressure and material consumption and large size error of the test piece during the production of the test piece in the configuration process of similar materials in the model test, and has the following advantages:

1. It can accurately control the amount of similar materials used in a single test piece, so that the quality of the test pieces is uniform;

2. Can successfully control the compaction pressure applied during the preparation of the test pieces, so that the density of the prepared test pieces can be guaranteed, and the density of the test pieces is basically the same, so the volume error between them is relatively small;

3. The range of pressure that can be applied is wide, suitable for the production of various similar material test pieces, and can achieve constant pressure loading for a certain period of time.

Description of drawings

Fig. 1 is a schematic structural view of the hydraulic part of the present invention;

Fig. 2 is a structural representation of the material molding die of the present invention;

1. Upper reaction force panel; 2. Reaction force frame pillar; 3. Pressure applying cylinder; 4. Pressure sensor; 5. Lower reaction force panel; 6. Mold top cover; 7. Mold hoop; 8. Side mold a ; 9. Side mold b; 10. Mold base.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

In Fig. 1 and Fig. 2, a device for precise press molding of test pieces in the process of preparing similar materials, including material forming molds and precise pressure control systems. The material forming mold can be disassembled and assembled, which is convenient for the brushing of the release agent in the early stage and the demoulding of the test piece in the later stage. The precise pressure control system can display the pressure and set the pressure to be applied to press the test piece.

The material forming mold is precisely processed by high-strength steel. It includes side mold a8 and side mold b9 on both sides, the bottom of both is installed on the mold base 10, the mold hoop 7 is installed on the top, and the mold top cover 6 is installed in the mold hoop 7.

The precise pressure application control system includes a lower reaction force panel 5 and a upper reaction force panel 1, and a reaction force frame pillar 2 is arranged between them, and the whole has a certain rigidity. The hydraulic oil cylinder 3 is installed on the inner top surface of the upper reaction force panel 1, and applies downward pressure for compaction. A pressure sensor 4 is installed on the hydraulic cylinder 3 to measure the applied pressure and transmit the data to the control system to control the compaction pressure of the test piece. The precise pressure application control system can apply different sizes of compaction pressure according to production needs.

A method for accurately pressing a test piece in the preparation process of similar materials, comprising the steps of:

A. Disassemble the material forming mold and apply the release agent evenly, and then assemble it;

B. Weigh the material according to the proportion and mix it evenly, and pour it into the material forming mold;

C. Place the material forming mold filled with the material in the designated position of the pressurization system, and control the pressurization system to compact the test piece according to the designated pressure;

D. Control the oil cylinder to rise, then take out the material forming mold, slowly remove the material forming mold according to the steps, take out the test piece, and put it in the designated ventilation position to dry;

E. Repeat this until a sufficient number of test pieces are obtained.

Claims (2)

1. the accurate compressing device of test specimen in a kind of process for preparation for analog material, it is characterized in that, including material shaping Mould and accurate pressure control system, wherein material mould is Demountable, and it is placed in accurate pressure control system It is interior, pressure size is shown by the control system that accurately presses and the pressure of the compacting test specimen to be applied is set；The material shaping Mould is accurately processed into by high strength steel, including side form a and side form b, and both are arranged on mold base, and mould is installed at top Tool hoop, mould top cover is arranged in mould hoop；

The accurate pressure control system includes lower counter-force panel, and counter-force post setting, overall tool are formed around in lower counter-force panel There is certain rigidity；Upper counter-force panel is arranged on counter-force pillar；Hydraulic jack, hydraulic oil are installed in upper counter-force panel inner top surface Pressure sensor is installed, pressure sensor is connected with control system on cylinder, control system control hydraulic cylinder.

2. a kind of use claim 1 is any described for the accurate compressing device of test specimen in analog material process for preparation Application method, it is characterized in that, comprise the following steps：

A. form the material into mould to take apart and uniform brushing releasing agent, then assemble；

B. proportionally weigh material and mix is uniform, pour into material mould；

C. the mould that material will be filled in is placed on the specified location of accurate pressure control system, the accurate pressure control system of control according to Be compacted for test specimen by the pressure specified；

D. control hydraulic cylinder rises, and then takes out material mould, material mould is slowly sloughed by step and takes out examination Part, is placed on the vent position specified and dries；

E. so circulation, until sufficient amount of test specimen is obtained.