An automated dry-wet freeze-thaw cycle test device and test method

Abstract

The present invention discloses an automated dry-wet freeze-thaw cycle test device, including an operating table, a control module, an evaporation module, a spray module, a weighing module, a refrigeration module, and a manipulator operation module; the spray module controls a peristaltic pump through a pulse sent by the control module to complete the control of the amount of water added; the weighing module detects the quality through a pressure sensor to complete the control of the quality and the collection of data; the refrigeration module adopts a refrigeration box; the manipulator operation module controls a stepping motor through the control module to achieve walking at any position in a two-dimensional space. The present invention also discloses an automated dry-wet freeze-thaw cycle test method. The test sends a signal to the control module according to the input parameter instruction, and the modules cooperate to complete the entire process of the dry-wet freeze-thaw cycle test. The invention device and invention method provided by the present invention are professionally used for loess dry-wet freeze-thaw cycle test, realize the full automatic control of the test, improve the test accuracy, reduce the personnel input, and reduce the production cost.

Description

Technical Field

[0001] The invention relates to an automated dry-wet freeze-thaw cycle test device and test method, which can automatically detect the dry-wet state and freeze-thaw state of a sample during the test, belongs to the field of dynamic balance testing of geotechnical properties, and realizes full-automatic control of dry-wet freeze-thaw cycle tests and improves test accuracy. Background Art

[0002] Under the influence of the atmospheric environment, loess highway slopes have been subjected to long-term dry-wet cycles and freeze-thaw cycles, which will inevitably cause changes in the physical and mechanical properties and structure of loess, thereby affecting its strength and permeability characteristics. Therefore, dry-wet cycles and freeze-thaw cycle tests are of great significance for studying the properties of loess.

[0003] To study the attenuation law of soil strength parameters with the number of drying and wetting and freeze-thaw cycles, the test samples must first be prepared and subjected to a corresponding number of drying and wetting and freeze-thaw cycles. This process requires a large workload, cumbersome operations, long time consumption, and poor precision control. The drying and wetting and freeze-thaw cycle tests after sample preparation cannot be automatically controlled.

[0004] The control of the amount of water added during the wet-dry cycle test and the quality control of the sample during the evaporation process require high precision. In the traditional wet-dry test, due to the lack of special instruments, it is difficult to accurately and uniformly add water to multiple samples during the artificial water addition process; during the evaporation process, it is impossible to accurately judge whether the sample has reached the required degree of dryness, and the conversion between the water addition and evaporation process requires the test personnel to weigh the sample at any time to judge the dry and wet state of the sample. The results obtained by the traditional wet-dry cycle test instrument are highly discrete, low in precision, and have large test errors. It is time-consuming and laborious, which increases the test cost. The freeze-thaw cycle test realizes the freeze-thaw process by setting the freezing temperature and the melting temperature. Generally, it can only realize the sample placement process, and cannot realize the sampling process after the test. Since there are many samples in the freeze-thaw cycle test at one time, all the test samples are generally put in, and they are taken out separately when the set cycle is completed. The batch removal of different times of tests must be completed manually. If the removal time of the cycle is missed, the next cycle test will be entered, which is time-consuming and laborious and affects the progress of the test. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and solve the problem that the prior art urgently needs an automated loess dry-wet freeze-thaw cycle test instrument, and to provide an automated dry-wet freeze-thaw cycle test device that can automatically, efficiently and accurately perform loess dry-wet freeze-thaw cycle tests. The device is professionally used for loess dry-wet freeze-thaw cycle tests, realizes fully automatic control of the test and improves the test accuracy.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A loess dry-wet freeze-thaw cycle test device includes an operating table, a control module, an evaporation module, a spray module, a weighing module, a refrigeration module, and a manipulator operation module. The evaporation module, the spray module, the weighing module, the refrigeration module, and the manipulator operation module are arranged on the operating table. The evaporation module detects the temperature through a temperature sensor, sends a signal to an intelligent temperature control instrument, and completes the temperature control; the spray module controls the peristaltic pump through the pulse sent by the control module to complete the control of the water addition amount; the weighing module detects the quality through a pressure sensor, sends a signal to the control module, and completes the quality control and data collection; the refrigeration module adopts a refrigeration box, controls the stepping motor through the control module to realize automatic door opening and closing, completes the refrigeration control, and can automatically complete the placement and removal of the sample; the manipulator operation module controls the stepping motor through the control module to realize walking at any position in the two-dimensional space. The test sends a signal to the control module according to the input parameter instruction, and each module cooperates to complete the whole process of the dry-wet freeze-thaw cycle test.

[0008] Furthermore, the test instrument includes an operating table, a control module, an evaporation module, a spray module, a weighing module, a refrigeration module, and a manipulator operation module. The evaporation module, the spray module, the weighing module, the refrigeration module, and the manipulator operation module are arranged on the operating table. The evaporation module detects the temperature through a temperature sensor, sends a signal to an intelligent temperature control instrument, and completes the temperature control; the spray module controls the peristaltic pump through the pulse sent by the control module, and completes the control of the water addition amount; the weighing module detects the quality through a pressure sensor, and sends a signal to the control module, and completes the quality control and data collection; the refrigeration module uses a refrigeration box, and controls the stepper motor through the control module to realize automatic door opening and closing, and completes the refrigeration control; the manipulator operation module controls the stepper motor through the control module, and realizes walking at any position in the two-dimensional space.

[0009] Furthermore, the control module includes a touch screen and a programmable logic controller. The touch screen is arranged on a bracket above the operating table, and the programmable logic controller is arranged in a control cabinet. The control cabinet is arranged at the lower left of the operating table.

[0010] Furthermore, the evaporation module includes a housing, a light wave tube, a temperature sensor and an intelligent temperature control instrument. The housing is fixed on the operating table, the light wave tube is placed in the middle of the housing and fixed directly above the sample, the temperature sensor is fixed on one side of the light wave tube, and the other end is connected to the intelligent temperature control instrument, and the intelligent temperature control instrument is arranged in the control cabinet.

[0011] Furthermore, the spray module includes a spray head, a rotary steering gear, a bracket, a limit switch, a peristaltic pump, a water storage box, a pipeline and a sample placement area. The spray head is connected to the rotary steering gear, the bracket is used to support the spray head and the rotary steering gear, the limit switch is set at the leftmost side of the rotary steering gear, the peristaltic pump is fixed under the operating table, the water storage box is on one side of the peristaltic pump, and the two are connected by a pipeline, and the sample placement area is located directly below the spray head.

[0012] Furthermore, the weighing module comprises a pressure sensor, a weighing body and a display screen. The pressure sensor is located on one side of the weighing body and the other end is connected to a control cabinet. The weighing body and the display screen are fixed on an operating table.

[0013] Furthermore, the refrigeration box, stepper motor and limit switch are respectively arranged on one side of the box door (at the closed position of the refrigeration box) and the operating table bracket position (at the maximum open position of the refrigeration box door).

[0014] Furthermore, the manipulator operation module comprises a sealed synchronous belt slide, an electric manipulator and a linking device. The sealed synchronous belt slide is arranged parallel to the entire operation table, and the electric manipulator is perpendicular to the sealed synchronous belt slide, and the two are connected by a linking device.

[0015] The present invention also discloses an automated dry-wet freeze-thaw cycle test method, the specific steps of which are as follows:

[0016] (1) Obtain the initial moisture content ω0 and initial mass m0 of the sample through geotechnical tests;

[0017] (2) Fill the water storage box with water, remove the air in the pipeline, turn on the power switch of the control cabinet, turn on the touch screen switch, turn on the host computer switch, and clear the display value of the weighing module;

[0018] (3) Open the host computer configuration software to display the parameter setting interface;

[0019] (4) Select the test operation mode: dry-wet cycle test, freeze-thaw cycle test, and dry-wet freeze-thaw cycle combined test;

[0020] (5) Set the number of dry-wet or freeze-thaw cycles n and the evaporation temperature t;

[0021] (6) Add water to the sample and set the water addition amount Δm. If the sample needs to be added with water to a moisture content of ω, the mass of water to be added is: After the first cycle is completed, the amount of water added in the subsequent cycle test is the evaporation amount, which is automatically determined by the control system;

[0022] (7) Set the water addition and standing time t (usually 12 hours);

[0023] (8) Evaporate or freeze the sample and set the mass m of the sample after evaporation or freezing. If the sample is to be evaporated to a water content of ω', the mass of the sample after evaporation is: This value is the critical value for entering the water adding state from evaporation. When the mass of the sample after evaporation reaches m, the evaporation module receives the control signal, stops evaporation, and enters the water adding state;

[0024] (9) For the freeze-thaw cycle test, the sample that has been left to stand after adding water is placed in a refrigerator by a robot operation, and the refrigeration process is completed according to the set freezing time t1. When the set time is reached, the robot operation module receives a signal and takes out the sample for a natural thawing process; the thawing time t2 is set. When the set time is reached, the robot operation module receives a signal, weighs the sample, and adds water according to the mass loss m'. After standing for a period of time t', the robot operation module receives a signal and places the sample in a refrigerator for a freezing test, and enters the next freeze-thaw cycle test.

[0025] The beneficial effects of the present invention are as follows: the present invention is specially used for the dry-wet freeze-thaw cycle test of loess. Compared with the previous test instruments, the present invention has the automatic measurement and control of parameters such as temperature and moisture. The conversion between water addition and evaporation does not require manual adjustment. The automatic conversion between water addition and evaporation is completed according to the signal returned by the weighing module to the control module. During the water addition and evaporation process, the sample is weighed in real time, and it is automatically determined whether the set requirements are met according to the set parameters. The conversion between freezing and melting is completed according to the signal given by the control system, and the full automatic control of the freeze-thaw cycle test can be realized. There is no need to manually open and close the door to take out the sample. The whole process is completed by the manipulator. The door is automatically opened and closed according to the set parameters, and the test samples are taken out in sequence. The modules of the test instrument are standardized in design and can be arbitrarily combined to form multiple sets of devices. The realization is not limited to the loess dry-wet cycle test, freeze-thaw cycle test and dry-wet freeze-thaw alternating test, but also the environmental test required by other materials can be realized, and it can be precisely controlled. The instrument can realize the full automatic control of the test process, with high test accuracy and small error. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0027] Figure 1 It is a structural schematic diagram of the automated dry-wet freeze-thaw cycle test device of the present invention;

[0028] Figure 2 is a top view of the evaporation module.

[0029] Figure 3 yes Figure 2 AA section view.

[0030] Figure 4 It is a top view of the weighing device.

[0031] Figure 5 It is a top view of the refrigeration unit.

[0032] Figure 6 It is the control cabinet layout diagram.

[0033] Figure 7 It is a control flow chart of the automated dry-wet freeze-thaw cycle test method of the present invention.

[0034] In the figure: 1. Low-pressure water pipe 2. Operating table bracket 3. Peristaltic pump 4. Control cabinet 5. Sample placement tray 6. Bracket 7. Rotary servo 8. Housing 9. Limit switch 11. Nozzle 13. Light wave tube 14. High-pressure water pipe 15. Manipulator 16. Sealed slide 17. Connection line 18. Guide rail 21. Scale body 22. Mounting bracket 23. Touch screen 24. Display 26. Door opening limit switch 27. Door closing limit switch 28. Refrigeration box 30. Water storage box 31. Refrigeration box stepper motor 32. Weighing sensor 33. Heating sensor 34. Light wave tube fixing clamp 41. Wiring slot 42. Box body 43. Air switch 44. Socket 45. Programmable logic controller 46. Power supply 48. Motor drive 50. Terminal 51. DC regulated power supply 52. ​​PID intelligent temperature control instrument 53. Relay 54. Solid-state relay. DETAILED DESCRIPTION

[0035] The technical solution of the present invention is described in detail below with reference to the accompanying drawings.

[0036] like Figure 1-7 As shown, the present invention discloses a loess dry-wet freeze-thaw cycle test device and test method, and the test device includes an operating table, a control module, an evaporation module, a spray module, a weighing module, a refrigeration module, and a manipulator operation module. The evaporation module, the spray module, the weighing module, the refrigeration module, and the manipulator operation module are arranged on the operating table. The evaporation module detects the temperature through a temperature sensor, sends a signal to an intelligent temperature control instrument, and completes the temperature control; the spray module controls the peristaltic pump through the pulse sent by the control module to complete the control of the amount of water added; the weighing module detects the quality through a pressure sensor, sends a signal to the control module, and completes the quality control and data collection; the refrigeration module adopts a refrigeration box, and controls the stepping motor through the control module to realize automatic door opening and closing, completes the refrigeration control, and can automatically complete the placement and removal of the sample; the manipulator operation module controls the stepping motor through the control module to realize walking at any position in the two-dimensional space. The test sends a signal to the control module according to the input parameter instruction, and each module cooperates to complete the whole process of the dry-wet freeze-thaw cycle test.

[0037] The control module includes a touch screen and a programmable logic controller. The touch screen is arranged on a bracket above the operating table. The programmable logic controller is arranged in a control cabinet. The control cabinet is arranged at the lower left of the operating table.

[0038] The evaporation module includes a housing, a light wave tube, a temperature sensor and a PID intelligent temperature control instrument. The housing is fixed on the operating table, the light wave tube is placed in the middle of the housing and fixed directly above the sample, the temperature sensor is fixed on one side of the light wave tube, and the other end is connected to the intelligent temperature control instrument, which is set in the control cabinet.

[0039] The spray module includes a spray head, a rotary servo, a bracket, a limit switch, a peristaltic pump, a water storage box, a pipeline and a sample placement tray. The spray head is connected to the rotary servo, the bracket is used to support the spray head and the rotary servo, the limit switch is set on the leftmost side of the rotary servo, the peristaltic pump is fixed under the operating table, the water storage box is on one side of the peristaltic pump, the two are connected by a pipeline, and the sample placement area is located directly below the spray head.

[0040] The weighing module includes a pressure sensor, a weighing body, and a display screen. The pressure sensor is located at one side of the weighing body, and the other end is connected to a control cabinet. The weighing body and the display screen are fixed on an operating table.

[0041] The refrigeration module includes a refrigeration box, a stepper motor, and a limit switch. The refrigeration box is located at the rightmost side of the operating table, the stepper motor is arranged on one side of the refrigeration box, and the limit switches are arranged on one side of the box door (at the closed position of the refrigeration box) and the operating table bracket position (at the maximum open position of the refrigeration box door).

[0042] The manipulator operation module comprises a sealed synchronous belt slide, an electric manipulator and a linking device. The sealed synchronous belt slide is arranged parallel to the entire operation table, and the electric manipulator is perpendicular to the sealed synchronous belt slide, and the two are connected by a linking device.

[0043] An automated dry-wet freeze-thaw cycle test method, the specific steps are as follows:

[0044] (1) Obtain the initial moisture content ω0 and initial mass m0 of the sample through geotechnical tests;

[0045] (2) Fill the water storage box with water, remove the air in the pipeline, turn on the power switch of the control cabinet, turn on the touch screen switch, turn on the host computer switch, and clear the display value of the weighing module;

[0046] (3) Open the host computer configuration software to display the parameter setting interface;

[0047] (4) Select the test operation mode: dry-wet cycle test, freeze-thaw cycle test, and dry-wet freeze-thaw cycle combined test;

[0048] (5) Set the number of dry-wet or freeze-thaw cycles n and the evaporation temperature t;

[0049] (6) Add water to the sample and set the water addition amount Δm. If the sample needs to be added with water to a moisture content of ω, the mass of water to be added is: The amount of water added after one cycle is the evaporation amount, which is automatically determined by the control system.

[0050] (7) Set the water addition and standing time t (usually 12 hours);

[0051] (8) Evaporate or freeze the sample and set the mass m of the sample after evaporation or freezing. If the sample is to be evaporated to a water content of ω', the mass of the sample after evaporation is: This value is the critical value for entering the water adding state from evaporation. When the mass of the sample after evaporation reaches m, the evaporation module receives the control signal, stops evaporation, and enters the water adding state;

[0052] (9) For the freeze-thaw cycle test, the sample that has been left to stand after adding water is placed in a refrigeration box by a robot operation, and the refrigeration process is completed according to the set freezing time t1. When the set time is reached, the robot operation module receives a signal and takes out the sample for a natural thawing process; the thawing time t2 is set. When the set time is reached, the robot operation module receives a signal and weighs the sample. According to the mass loss m', the system automatically determines whether to add water. After standing for a period of time t', the robot operation module receives a signal and places the sample in a refrigeration box for a freezing test, and then enters the next freeze-thaw cycle test.

[0053] The invention provides a test device which is specially used for loess dry-wet freeze-thaw cycle test, realizes full-automatic control of the test and improves the test accuracy.

[0054] The test sends signals to the control module based on the input parameter instructions, and each module collaborates to complete the entire process of the dry-wet freeze-thaw cycle test.

[0055] The test device and test method provided by the present invention are professionally used for loess dry-wet freeze-thaw cycle test, realize full-automatic control of the test, improve test accuracy, reduce personnel input, and reduce production costs.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An automated dry-wet freeze-thaw cycle test device, characterized in that: It includes an operating table, a control module, an evaporation module, a spray module, a weighing module, a refrigeration module, and a manipulator operation module; the evaporation module, the spray module, the weighing module, the refrigeration module, and the manipulator operation module are arranged on the operating table; the evaporation module is used to heat and evaporate the sample, detect the temperature through the temperature sensor, and send the signal to the intelligent temperature control instrument to complete the temperature control; the spray module controls the peristaltic pump through the pulse sent by the control module to complete the control of the water addition amount; the weighing module detects the quality through the pressure sensor, and sends the signal to the control module to complete the quality control and data collection; the refrigeration module adopts a refrigeration box, and controls the stepping motor through the control module to realize automatic door opening and closing, complete the refrigeration control, and can automatically complete the placement and removal of the sample; the manipulator operation module controls the stepping motor through the control module to realize walking at any position in the two-dimensional space; The control module includes a touch screen and a programmable logic controller. The touch screen is arranged on a bracket above the operating table, and the programmable logic controller is arranged in a control cabinet. The control cabinet is arranged at the lower left of the operating table. The evaporation module includes a shell, a light wave tube, a temperature sensor and a PID intelligent temperature control instrument; the shell is fixed on the operating table, the light wave tube is placed in the middle of the shell and fixed directly above the sample, the temperature sensor is fixed on one side of the light wave tube, and the other end is connected to the intelligent temperature control instrument, and the intelligent temperature control instrument is arranged in the control cabinet; The spray module includes a spray head, a rotary steering gear, a bracket, a limit switch, a peristaltic pump, a water storage box, a pipeline and a sample placement tray. The spray head is connected to the rotary steering gear, the bracket is used to support the spray head and the rotary steering gear, the limit switch is arranged on the leftmost side of the rotary steering gear, the peristaltic pump is fixed under the operating table, the water storage box is on one side of the peristaltic pump, the two are connected by a pipeline, and the sample placement area is located directly below the spray head; The weighing module includes a pressure sensor, a weighing body, and a display screen. The pressure sensor is located on one side of the weighing body, and the other end is connected to the control cabinet. The weighing body and the display screen are fixed on the operating table. The refrigeration module includes a refrigeration box, a stepper motor, a door opening limit switch, and a door closing limit switch; the refrigeration box is located on the far right of the operating table, the stepper motor is arranged on one side of the refrigeration box, the door closing limit switch is arranged on one side of the box door, and the door opening limit switch is located at the operating table bracket; The manipulator operation module includes a sealed synchronous belt slide, an electric manipulator and a connecting device. The sealed synchronous belt slide is arranged above the entire operating table, and the electric manipulator is perpendicular to the sealed synchronous belt slide, and the two are connected by the connecting device.

2. An automated dry-wet freeze-thaw cycle test method, characterized in that: The device according to claim 1 comprises the following steps: (1) Obtain the initial moisture content of the sample through geotechnical testing and initial quality ; (2) Fill the water storage box with water, remove the air in the pipeline, turn on the power switch of the control cabinet, turn on the touch screen switch, turn on the host computer switch, and clear the display value of the weighing module; (3) Open the host computer configuration software to display the parameter setting interface; (4) Select the test operation mode: dry-wet cycle test, freeze-thaw cycle test, and dry-wet freeze-thaw cycle combined test; (5) Set the number of dry-wet or freeze-thaw cycles N and the evaporation temperature T; (6) Add water to the sample and set the amount of water added If necessary, add water to the sample until the moisture content is , the mass of water to be added is: After the first cycle is completed, the amount of water added in the subsequent cycle test is the evaporation amount, which is automatically determined by the control system; (7) Set the water addition and standing time t; (8) Evaporate or freeze the sample and set the mass m of the sample after evaporation or freezing. If the sample needs to be evaporated to a water content of After evaporation, the sample mass is: , this value is the critical value from evaporation to water addition. When the mass of the sample reaches m after evaporation, the evaporation module receives the control signal, stops evaporation, and enters the water addition state; (9) For the freeze-thaw cycle test, the sample that has been left to stand for a period of time t' is placed in a freezer by a robot. The refrigeration process is completed according to the set freezing time t1. When the set time is reached, the robot operation module receives a signal and takes out the sample for a natural thawing process. The thawing time t2 is set. When the set time is reached, the robot operation module receives a signal, weighs the sample, and adds water according to the mass loss m'. After standing for a period of time t', the robot operation module receives a signal and places the sample in a freezer for a freezing test, and then enters the next freeze-thaw cycle test.

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