Indoor test device for simulating impact load

Abstract

The utility model belongs to the technical field of test equipment, and particularly relates to an indoor test device for simulating impact load, which comprises a base, the pressure chamber is arranged at the top of the base, and a sample is placed in the pressure chamber; the repeated impact mechanism is arranged at the top of the pressure chamber, and the repeated impact mechanism is used for carrying out repeated impact on the test in the pressure chamber; the air supply mechanism communicates with the repeated impact mechanism, and the air supply mechanism is used for controlling the repeated impact mechanism to achieve repeated impact; the liquid pressurizing mechanism is communicated with the pressure chamber, and the liquid pressurizing mechanism is used for pressurizing the outer side and the interior of the sample. According to the utility model, the test efficiency and the result accuracy can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of test equipment, and particularly relates to an indoor test device for simulating impact loads. Background Technique

[0002] In the treatment of soft foundations, dynamic compaction method and pile foundation method are the most commonly used foundation reinforcement methods. The dynamic compaction method will generate shock waves and dynamic stresses in the foundation soil, thereby improving the strength of the foundation soil, reducing the compressibility of the soil, improving the liquefaction resistance of sandy soil, and reducing the differential settlement that may occur in the future. The pile foundation method can well adapt to various geological conditions and load conditions, and has the characteristics of large bearing capacity, good stability and small settlement. However, during the process of dynamic compaction of the foundation and driving of precast piles, the foundation will be subjected to impact loads. For sandy soil such as calcareous sand that is prone to particle breakage, the impact load will cause changes in the particle size distribution, density, etc. of the soil, thereby causing changes in the mechanical properties of the soil.

[0003] The test of soil impact load has important guiding significance for coping with actual working conditions. However, there is currently no indoor test device for sandy soil that is prone to particle breakage under impact load.

[0004] Therefore, it is necessary to design an indoor test device for simulating impact loads to solve the above problems. Content of the Utility Model

[0005] The purpose of the utility model is to provide an indoor test device for simulating impact loads to solve the above problems and achieve the purpose of improving test efficiency and test result accuracy.

[0006] To achieve the above purpose, the utility model provides the following scheme: An indoor test device for simulating impact loads, including

[0007] A base;

[0008] A pressure chamber, the pressure chamber is arranged on the top of the base, and the specimen is placed in the pressure chamber;

[0009] A repeated impact mechanism, the repeated impact mechanism is arranged on the top of the pressure chamber, and the repeated impact mechanism is used to repeatedly impact the test in the pressure chamber;

[0010] An air supply mechanism, the air supply mechanism is communicated with the repeated impact mechanism, and the air supply mechanism is used to control the repeated impact mechanism to achieve repeated impact;

[0011] A liquid pressurizing mechanism, the liquid pressurizing mechanism is communicated with the pressure chamber, and the liquid pressurizing mechanism is used to pressurize the outside and inside of the specimen.

[0012] Preferably, the repeated impact mechanism includes a conduit, the top end of the conduit is fixedly communicated with one end of a solenoid valve, the other end of the solenoid valve is fixedly communicated with the air supply mechanism, an impact iron block is slidably arranged inside the conduit, an electromagnet is fixedly connected to the bottom of the outer side wall of the conduit, the electromagnet corresponds to the impact iron block, a dial is arranged on the outer side wall of the impact iron block, a chute is formed in the side wall of the conduit, and the dial is slidably arranged in the chute.

[0013] Preferably, the pressure chamber includes a connecting seat, the connecting seat is fixedly connected to the top end of the base, a cover shell is fixedly connected to the top end of the connecting seat, the specimen is placed inside the cover shell, a sealing plate is fixedly connected to the top end of the cover shell, a force transmission rod is coaxially and sealingly slidably connected to the middle of the sealing plate, the top end of the force transmission rod corresponds to the impact iron block, and the bottom end of the force transmission rod corresponds to the specimen.

[0014] Preferably, two support screws are threadedly connected to the top of the base, the two support screws are vertically and symmetrically arranged on both sides of the cover shell, a cross beam is commonly threadedly connected to the tops of the two support screws, and the force transmission rod vertically slides through the middle of the cross beam.

[0015] Preferably, a fixing plate is fixedly connected to the middle of one side wall of the cross beam, and the conduit is fixedly connected to the fixing plate through a hoop.

[0016] Preferably, the sealing plate is fixedly connected to the connecting seat through a plurality of first screws and a plurality of second screws, the first screws and the second screws are arranged outside the cover shell, and the plurality of first screws and the plurality of second screws are arranged at equal intervals along the circumferential direction of the cover shell.

[0017] Preferably, the liquid pressurizing mechanism includes two liquid pressure controllers, one liquid pressure controller is communicated between the inner side wall of the cover shell and the outer side wall of the specimen through a liquid pipe, and the other liquid pressure controller is communicated with the inside of the specimen through another liquid pipe.

[0018] Preferably, the air supply mechanism includes a gas energy storage tank, the air inlet end of the gas energy storage tank is communicated with an air compressor through a first gas pipe, and the air outlet end of the gas energy storage tank is communicated with the solenoid valve through a second gas pipe.

[0019] Compared with the prior art, the utility model has the following advantages and technical effects:

[0020] The utility model controls the repeated impact mechanism through the provided air supply mechanism, enabling the obtained impact load data to be closer to the actual situation, thereby improving the accuracy of the test results. The provided repeated impact mechanism can repeatedly impact the specimen, improving the test efficiency. The provided liquid increasing mechanism can change the liquid pressure around the specimen in the pressure chamber according to actual needs, further improving the accuracy of the test. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings:

[0022] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0023] Among them, 1, liquid pressure controller; 2, liquid pipe; 3, base; 4, support screw; 5, cross beam; 6, gas energy storage tank; 7, first gas pipe; 8, second gas pipe; 9, solenoid valve; 10, conduit; 11, electromagnet; 12, impact iron block; 13, force transmission rod; 14, communication seat; 15, housing; 16, sealing plate; 17, first screw; 18, second screw; 19, fixing plate; 20, hoop. Detailed Embodiment

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0025] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0026] Referring to Figure 1 As shown, the present utility model provides an indoor test device for simulating impact loads, including a base 3;

[0027] A pressure chamber is arranged on the top of the base 3, and the specimen is placed in the pressure chamber;

[0028] A repeated impact mechanism is arranged on the top of the pressure chamber, and the repeated impact mechanism is used to repeatedly impact the test in the pressure chamber;

[0029] An air supply mechanism, which is connected to the repeated impact mechanism, and is used to control the repeated impact mechanism to achieve repeated impacts.

[0030] A liquid pressurizing mechanism, which is connected to the pressure chamber, and is used to pressurize the outside and inside of the specimen.

[0031] In a further optimized solution, the repeated impact mechanism includes a conduit 10. One end of the conduit 10 is fixedly connected to the top of a solenoid valve 9, and the other end of the solenoid valve 9 is fixedly connected to the air supply mechanism. An impact iron block 12 is slidably arranged inside the conduit 10. An electromagnet 11 is fixedly connected to the bottom of the outer side wall of the conduit 10, corresponding to the impact iron block 12. A dial is arranged on the outer side wall of the impact iron block 12, and a chute is formed in the side wall of the conduit 10, and the dial is slidably arranged in the chute.

[0032] The air supply mechanism is connected to the intake part of the solenoid valve 9. The solenoid valve 9 is located at the top of the conduit 10. When the solenoid valve 9 loses power, the channel is closed, and the impact iron block 12 is adsorbed on the electromagnet 11 at a fixed position in the middle of the conduit 10, forming a closed space. The air supply mechanism is opened to obtain the required pressure; the bottom of the conduit 10 contacts the force transmission rod 13. In addition, pulling the dial on the side of the impact iron block 12 can restore the impact iron block 12 to its original position after the test.

[0033] In a further optimized solution, the pressure chamber includes a connecting seat 14, which is fixedly connected to the top of the base 3. A housing 15 is fixedly connected to the top of the connecting seat 14. The specimen is placed inside the housing 15. A sealing plate 16 is fixedly connected to the top of the housing 15. A force transmission rod 13 is coaxially and sealingly slidably connected to the middle of the sealing plate 16. The top of the force transmission rod 13 corresponds to the impact iron block 12, and the bottom of the force transmission rod 13 corresponds to the specimen.

[0034] In a further optimized solution, two support screws 4 are threadedly connected to the top of the base 3. The two support screws 4 are vertically and symmetrically arranged on both sides of the housing 15. A cross beam 5 is commonly threadedly connected to the tops of the two support screws 4. The force transmission rod 13 vertically slides through the middle of the cross beam 5.

[0035] A force sensor is arranged on the base 3 to monitor the stress received by the specimen, and a displacement sensor is arranged on the specimen to collect the deformation of the specimen. The housing 15 is a hollow cylinder made of tempered glass. The bottom of the housing 15 is fixed to the base 3 by bolts. A circular hole is formed in the center of the sealing plate 16, and the force transmission rod 13 is placed in the hole. The force transmission rod 13 is a cylindrical steel pipe. The top of the force transmission rod 13 is connected to the repeated impact mechanism, and the bottom is connected to the specimen.

[0036] In a further optimized solution, a fixing plate 19 is fixedly connected to the middle of one side wall of the cross beam 5. The conduit 10 is fixedly connected to the fixing plate 19 through a hoop 20.

[0037] For a further optimized solution, the sealing plate 16 is fixedly connected to the communication base 14 through a plurality of first screw rods 17 and a plurality of second screw rods 18. The first screw rods 17 and the second screw rods 18 are arranged outside the housing 15, and the plurality of first screw rods 17 and the plurality of second screw rods 18 are arranged at equal intervals along the circumferential direction of the housing 15.

[0038] For a further optimized solution, the liquid pressurizing mechanism includes two liquid pressure controllers 1. One liquid pressure controller 1 is communicated between the inner side wall of the housing 15 and the outer side wall of the specimen through a liquid pipe 2, and the other liquid pressure controller 1 is communicated with the inside of the specimen through another liquid pipe 2.

[0039] Among the two liquid pressure controllers 1, one controls the ambient pressure of the specimen inside the housing 15 and is connected to the side wall of the housing 15. One controls the internal pressure of the specimen and is connected to the communication base 14. Through the feedback of the pore pressure sensor inside the liquid pressure controller 1, the stepping motor is used to control the inflow and outflow of water in the pressure chamber, so as to separately and real-time control the pressure magnitude in the pressure chamber.

[0040] For a further optimized solution, the air supply mechanism includes a gas energy storage tank 6. The intake end of the gas energy storage tank 6 is communicated with an air compressor through a first gas pipe 7, and the outlet end of the gas energy storage tank 6 is communicated with a solenoid valve 9 through a second gas pipe 8.

[0041] The present utility model also provides a usage method of an indoor test device for simulating impact loads, including the following steps:

[0042] S1. Fabricate a specimen and place the specimen in the pressure chamber;

[0043] Process the material to be tested, such as sand, clay, rock, metal, into a cylindrical specimen, then fix the specimen on the communication base 14, then cover the housing 15 outside the specimen, and connect the load transfer rod 13 with the specimen;

[0044] S2. Fill the pressure chamber with liquid and apply pressure to the pressure chamber through the liquid pressurizing mechanism;

[0045] Fill the pressure chamber with degassed water, and then pressurize the pressure chamber through the liquid pressure controller 1 to make the pressure in the pressure chamber reach the test required conditions. For porous medium materials, pressurize the inside of the specimen through the liquid pressure controller 1 to make the internal pressure of the specimen reach the test required conditions;

[0046] S3. Control the repeated impact mechanism to impact the specimen through the air supply mechanism;

[0047] The electromagnetic valve 9 is switched on and off, and the impact iron block 12 for generating impact load is adsorbed at a fixed position in the conduit 10, so that the conduit 10 is in a closed state. At this time, the conduit 10 is pressurized by an air compressor. When the pressure gauge shows that the conduit 10 has reached the specified pressure, power is obtained, the electromagnet 11 loses magnetism, the channel of the electromagnetic valve 9 is opened, and the impact iron block 12 is pushed out by the high-pressure gas, slides in the conduit 10 and hits the force transmission rod 13, causing the sample to deform;

[0048] S4. Repeat S3 until the specimen fails.

[0049] When the power is off, the electromagnetic valve 9 is closed again, the electromagnet 11 is magnetized, and the impact iron block 12 at the bottom of the catheter 10 is moved to restore it to its original position, and step S3 is repeated until the sample is destroyed.

[0050] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0051] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope of the present invention.

Claims

1. An indoor test device for simulating impact loads, characterized in that Comprising a base (3); a pressure chamber which is arranged at the top of the base (3) and in which a specimen is placed; a repeated impact mechanism which is arranged at the top of the pressure chamber and is used for repeatedly impacting the test in the pressure chamber; a gas supply mechanism which is communicated with the repeated impact mechanism and is used for controlling the repeated impact mechanism to achieve repeated impact; a liquid pressurizing mechanism which is communicated with the pressure chamber and is used for pressurizing the outside and inside of the specimen.

2. The indoor test device for simulating impact load according to claim 1, wherein, The repeated impact mechanism includes a conduit (10), one end of the conduit (10) is fixedly communicated with one end of a solenoid valve (9), the other end of the solenoid valve (9) is fixedly communicated with the gas supply mechanism, an impact iron block (12) is slidably arranged inside the conduit (10), an electromagnet (11) is fixedly connected to the bottom of the outer side wall of the conduit (10), the electromagnet (11) corresponds to the impact iron block (12), a dial is arranged on the outer side wall of the impact iron block (12), and a chute is formed in the side wall of the conduit (10), and the dial is slidably arranged in the chute.

3. The indoor test device for simulating impact loads according to claim 2, characterized in that, The pressure chamber includes a connecting seat (14) which is fixedly connected to the top end of the base (3), a housing (15) is fixedly connected to the top end of the connecting seat (14), the specimen is placed inside the housing (15), a sealing plate (16) is fixedly connected to the top end of the housing (15), a force transmission rod (13) is coaxially and sealingly slidably connected to the middle of the sealing plate (16), the top end of the force transmission rod (13) corresponds to the impact iron block (12), and the bottom end of the force transmission rod (13) corresponds to the specimen.

4. An indoor test device for simulating impact loads according to claim 3, characterized in that, Two support screws (4) are threadedly connected to the top of the base (3), the two support screws (4) are vertically and symmetrically arranged on both sides of the housing (15), a cross beam (5) is commonly threadedly connected to the tops of the two support screws (4), and the force transmission rod (13) vertically slides through the middle of the cross beam (5).

5. An indoor test device for simulating impact loads according to claim 4, characterized in that, A fixing plate (19) is fixedly connected to the middle of one side wall of the cross beam (5), and the conduit (10) is fixedly connected to the fixing plate (19) through a hoop (20).

6. An indoor test device for simulating impact loads according to claim 3, characterized in that, The sealing plate (16) is fixedly connected to the connecting seat (14) through a plurality of first screws (17) and a plurality of second screws (18), the first screws (17) and the second screws (18) are arranged outside the housing (15), and the plurality of first screws (17) and the plurality of second screws (18) are arranged at equal intervals along the circumferential direction of the housing (15).

7. An indoor test device for simulating impact loads according to claim 3, characterized in that, The liquid pressurizing mechanism includes two liquid pressure controllers (1), one liquid pressure controller (1) is communicated between the inner side wall of the housing (15) and the outer side wall of the specimen through a liquid pipe (2), and the other liquid pressure controller (1) is communicated with the inside of the specimen through another liquid pipe (2).

8. An indoor test device for simulating impact loads according to claim 2, characterized in that, The air supply mechanism includes a gas energy storage tank (6). The inlet end of the gas energy storage tank (6) is connected to an air compressor through a first gas pipe (7), and the outlet end of the gas energy storage tank (6) is connected to the solenoid valve (9) through a second gas pipe (8).

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