Device and method for testing crystallization point of ammonium nitrate solution

Abstract

The invention discloses an ammonium nitrate solution devitrification point testing device and method.The device comprises a water bath box and a sample cup, a supporting assembly is arranged at one end of the water bath box, a testing assembly is arranged in the supporting assembly, the supporting assembly comprises a clamping ring, and the outer wall of the bottom of the water bath box is fixedly sleeved with the clamping ring; and the outer wall of the water bath box is movably sleeved with an annular rotating plate. The temperature sensed by the infrared temperature sensing probe and the conductivity sensed by the detection electrode are displayed through the digital display, the conductivity suddenly changes along with gradual reduction of the temperature when the temperature reaches the crystallization point temperature, the system automatically records and stores the temperature at the moment, namely the temperature of the crystallization point of the ammonium nitrate solution, and if the temperature difference between the environment temperature and the solution temperature is small, the temperature is not changed. The temperature of the solution is slowly reduced, warm water can be input into the water bath box, the temperature in the sample cup is changed by controlling the cooling speed of the warm water in the water bath box, the temperature is controlled to be slowly reduced, and the data of the crystallization point of the ammonium nitrate solution is accurately detected.

Description

Technical Field

[0001] The invention relates to the technical field of crystallization point testing of ammonium nitrate solution, and in particular to a device and method for testing the crystallization point of ammonium nitrate solution. Background Art

[0002] The crystallization point of ammonium nitrate solution is an important indicator parameter of the water phase formula. The crystallization point temperature needs to be strictly controlled. It has an important influence on the storage stability, thermal stability and explosive performance of emulsion explosives.

[0003] At present, the crystallization point temperature of high-temperature supersaturated ammonium nitrate aqueous solution is mainly determined by manual methods in laboratory scientific research experiments and actual production. Sampling is done through a conical flask, and a thermometer is inserted into the solution through a rubber stopper to observe the temperature at which the ammonium nitrate begins to crystallize. The operation process is cumbersome and has a large human factor. Ammonium nitrate tends to crystallize preferentially at the end of the thermometer, resulting in large experimental errors. Frequent operation of high-temperature ammonium nitrate solution is prone to burns, and it is toxic to a certain extent, so there are certain safety hazards. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one purpose of the present invention is to provide a device and method for testing the crystallization point of an ammonium nitrate solution, by controlling the cooling rate of warm water in a water bath to change the temperature in a sample cup, controlling the temperature to slowly decrease, and accurately detecting the data of the crystallization point of the ammonium nitrate solution.

[0005] The crystallization point testing device of ammonium nitrate solution proposed by the present invention comprises a water bath box and a sample cup, a support assembly is arranged at one end of the water bath box, and a test assembly is arranged inside the support assembly; The support assembly includes a clamping ring, which is fixedly sleeved on the bottom outer wall of the water bath box, an annular rotating plate is movably sleeved on the outer wall of the water bath box, a threaded rod is rotatably connected to the surface of the annular rotating plate through a bearing, a threaded barrel is threadedly connected on the outer wall of the upper end of the threaded rod, a hydraulic cylinder is fixedly connected to the outer wall of one end of the threaded barrel, a sleeve is fixedly connected to the other end of the hydraulic cylinder, and a rubber ring is fixedly sleeved on the inner wall of the lower end of the sleeve; The test assembly includes a fixed block, which is embedded in the outer wall of the upper end of the sleeve, one end of the fixed block located inside the sleeve is fixedly connected to an infrared temperature probe, and the other end of the fixed block is fixedly connected to a digital display, and a card block is clamped on the inner wall of the sleeve, and two electrode interfaces are symmetrically and movably plugged on the surface of the card block; The sample cup is detachably provided with two detection electrodes, the detection electrodes are connected with connecting wires, and the connecting wires are detachably connected to the electrode interface.

[0006] Preferably, a fixing plate is fixedly connected to the outer wall of one end of the threaded barrel, a limiting rod is movably inserted inside the fixing plate, and the lower end of the limiting rod is fixedly connected to the upper surface of the annular rotating plate.

[0007] Preferably, the inner wall of the annular rotating plate is in contact with the outer wall of the water bath box, and the annular rotating plate is located on the upper surface of the clamping ring.

[0008] Preferably, the infrared temperature sensing probe is embedded in the center of the block, and the infrared temperature sensing probe corresponds to the center of the sleeve.

[0009] Preferably, the upper ends of the two electrode interfaces are fixedly connected with wires.

[0010] The testing method of the above-mentioned ammonium nitrate solution crystallization point testing device proposed by the present invention comprises the following steps: S1: Add the sample into the sample cup and connect the connecting wire to the wire interface; S2: Insert the upper opening of the sample cup into the sleeve so that the upper opening of the sample cup is clamped inside the rubber ring; S3: Push the infrared temperature probe to correspond to the center of the sample cup, turn on the digital display, and display the temperature sensed by the infrared temperature probe and the conductivity sensed by the detection electrode on the digital display; S4: As the temperature gradually decreases, when the crystallization point temperature is reached, the conductivity changes suddenly, and the system automatically records and saves the temperature at this time, which is the crystallization point temperature of the ammonium nitrate solution.

[0011] The beneficial effects of the present invention are as follows: the temperature sensed by the infrared temperature sensing probe and the conductivity sensed by the electrode interface are displayed by a digital display; as the temperature gradually decreases, when the crystallization point temperature is reached, the conductivity suddenly changes, and the system automatically records and saves the temperature at this time, which is the temperature of the crystallization point of the ammonium nitrate solution; if the temperature difference between the ambient temperature and the solution temperature is small, and the solution temperature drops slowly, warm water can be input into the water bath box, and the temperature in the sample cup can be changed by controlling the cooling rate of the warm water in the water bath box, so that the temperature is controlled to drop slowly, and the data of the crystallization point of the ammonium nitrate solution can be accurately detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The present invention provides a schematic structural diagram of a device for testing the crystallization point of an ammonium nitrate solution.

[0013] Figure 2 The present invention provides a schematic cross-sectional structure diagram of a device for testing the crystallization point of an ammonium nitrate solution.

[0014] Figure 3 This is a schematic structural diagram of the support assembly proposed in the present invention.

[0015] Figure 4This is a schematic diagram of the structure of the card block proposed by the present invention.

[0016] Figure 5 This is a schematic structural diagram of the sleeve proposed in the present invention.

[0017] Figure 6 This is a schematic diagram of the structure of the sample cup proposed by the present invention.

[0018] In the figure: 1-water bath box, 2-support assembly, 21-clamping ring, 22-annular rotating plate, 23-bearing, 24-threaded rod, 25-threaded cylinder, 26-fixed plate, 27-limiting rod, 28-hydraulic cylinder, 29-sleeve, 210-rubber ring, 3-test assembly, 31-fixed block, 32-digital display, 33-infrared temperature sensor, 34-block, 35-electrode interface, 36-wire, 4-sample cup, 41-detection electrode, 42-connecting wire. DETAILED DESCRIPTION

[0019] Reference Figure 1-6 , a crystallization point testing device for ammonium nitrate solution, comprising a water bath box 1 and a sample cup 4, a support component 2 is arranged at one end of the water bath box 1, and a test component 3 is arranged inside the support component 2; The support assembly 2 includes a clamping ring 21, which is fixedly sleeved on the bottom outer wall of the water bath box 1. An annular rotating plate 22 is movably sleeved on the outer wall of the water bath box 1. A threaded rod 24 is rotatably connected to the surface of the annular rotating plate 22 through a bearing 23. A threaded barrel 25 is threadedly connected to the outer wall of the upper end of the threaded rod 24. A hydraulic cylinder 28 is fixedly connected to the outer wall of one end of the threaded barrel 25. A sleeve 29 is fixedly connected to the other end of the hydraulic cylinder 28. A rubber ring 210 is fixedly sleeved on the inner wall of the lower end of the sleeve 29. The upper end opening of the sample cup is inserted into the sleeve 29 so that the upper end opening of the sample cup is clamped in the rubber ring 210. The hydraulic cylinder 28 is controlled to extend and retract while the annular rotating plate 22 is rotated. At the same time, the threaded barrel 25 can be driven to move up and down by rotating the threaded rod 24, so that the sleeve 29 moves in the water bath box 1, so that the sample cup at the lower end of the sleeve 29 can be conveniently controlled to enter the water bath box 1 for temperature control. The test assembly 3 includes a fixed block 31, which is embedded in the outer wall of the upper end of the sleeve 29. One end of the fixed block 31 located inside the sleeve 29 is fixedly connected to an infrared temperature probe 33, and the other end of the fixed block 31 is fixedly connected to a digital display 32. A clamping block 34 is clamped on the inner wall of the sleeve 29, and two electrode interfaces 35 are symmetrically and movably plugged on the surface of the clamping block 34. The sample cup (4) is detachably provided with two detection electrodes (41), the detection electrodes (41) are connected to connection wires (42), and the connection wires (42) are detachably connected to the electrode interface (35).

[0020] The electrode interface is connected to the connecting line on the sample cup, and the infrared temperature sensing probe 33 corresponds to the center of the inside of the sample cup. The digital display 32 is turned on to display the temperature sensed by the infrared temperature sensing probe 33 and the conductivity sensed by the detection electrode 41. As the temperature gradually decreases, when the crystallization point temperature is reached, the conductivity suddenly changes, and the system automatically records and saves the temperature at this time.

[0021] A fixing plate 26 is fixedly connected to the outer wall of one end of the threaded barrel 25, and a limiting rod 27 is movably inserted inside the fixing plate 26. The lower end of the limiting rod 27 is fixedly connected to the upper surface of the annular rotating plate 22. The position of the fixing plate 26 is limited by the limiting rod 29, so that the threaded barrel 25 cannot rotate, and the threaded barrel 25 is pushed by the threaded rod 24 to move up and down stably.

[0022] The inner wall of the annular rotating plate 22 fits the outer wall of the water bath box 1 , and the annular rotating plate 22 is located on the upper surface of the clamp ring 21 , and the clamp ring 21 supports the annular rotating plate 22 to stably rotate on the outer wall of the water bath box 1 .

[0023] The infrared temperature sensing probe 33 is embedded in the center of the block 34 , and the infrared temperature sensing probe 33 corresponds to the center of the sleeve 29 , so that the infrared temperature sensing probe 33 faces the center of the liquid surface of the sample cup to be detected.

[0024] The upper ends of the two electrode interfaces 35 are fixedly connected with a wire 36 , and the two electrode interfaces 35 are connected by the wire 36 , so that a loop can be formed between the two electrode interfaces 35 to measure the conductivity.

[0025] The testing method of the ammonium nitrate solution crystallization point testing device proposed by the present invention is as follows: S1: Add the sample into the sample cup and connect the connecting wire to the wire interface; S2: Insert the upper opening of the sample cup into the sleeve so that the upper opening of the sample cup is clamped inside the rubber ring; S3: Push the infrared temperature probe to correspond to the center of the sample cup, turn on the digital display, and display the temperature sensed by the infrared temperature probe and the conductivity sensed by the detection electrode on the digital display; S4: As the temperature gradually decreases, when the crystallization point temperature is reached, the conductivity changes suddenly, and the system automatically records and saves the temperature at this time, which is the crystallization point temperature of the ammonium nitrate solution.

[0026] If the temperature difference between the ambient temperature and the solution temperature is small and the solution temperature drops slowly, warm water can be input into the water bath box 1. The temperature in the sample cup can be changed by controlling the cooling rate of the warm water in the water bath box 1. The temperature can be controlled to drop slowly and the data of the crystallization point of the ammonium nitrate solution can be accurately detected.

[0027] The test assembly of the present invention has an automatic temperature compensation function, and when calculating the conductivity change, the influence of the temperature change on the solution conductivity is eliminated in advance.

Claims

1. Ammonium nitrate solution crystallization point testing device, characterized in that: It comprises a water bath box (1) and a sample cup (4), wherein a support component (2) is arranged at one end of the water bath box (1), and a test component (3) is arranged inside the support component (2); The support assembly (2) comprises a snap ring (21), the snap ring (21) being fixedly sleeved on the bottom outer wall of the water bath box (1), an annular rotating plate (22) being movably sleeved on the outer wall of the water bath box (1), a threaded rod (24) being rotatably connected to the surface of the annular rotating plate (22) via a bearing (23), a threaded barrel (25) being threadedly connected to the outer wall of the upper end of the threaded rod (24), a hydraulic cylinder (28) being fixedly connected to the outer wall of one end of the threaded barrel (25), a sleeve (29) being fixedly connected to the other end of the hydraulic cylinder (28), and a rubber ring (210) being fixedly sleeved on the inner wall of the lower end of the sleeve (29); The test assembly (3) comprises a fixed block (31), the fixed block (31) being embedded in the upper outer wall of the sleeve (29), one end of the fixed block (31) located inside the sleeve (29) being fixedly connected to an infrared temperature probe (33), the other end of the fixed block (31) being fixedly connected to a digital display (32), a clamping block (34) being clamped on the inner wall of the sleeve (29), and two electrode interfaces (35) being symmetrically and movably plugged on the surface of the clamping block (34); The sample cup (4) is detachably provided with two detection electrodes (41), the detection electrodes (41) are connected to connection wires (42), and the connection wires (42) are detachably connected to the electrode interface (35).

2. The crystallization point testing device of ammonium nitrate solution according to claim 1, characterized in that: A fixing plate (26) is fixedly connected to the outer wall of one end of the threaded barrel (25), a limiting rod (27) is movably inserted inside the fixing plate (26), and the lower end of the limiting rod (27) is fixedly connected to the upper surface of the annular rotating plate (22).

3. The crystallization point testing device of ammonium nitrate solution according to claim 1, characterized in that: The inner wall of the annular rotating plate (22) is in contact with the outer wall of the water bath box (1), and the annular rotating plate (22) is located on the upper surface of the clamping ring (21).

4. The crystallization point testing device of ammonium nitrate solution according to claim 1, characterized in that: The infrared temperature sensing probe (33) is embedded in the center of the clamping block (34), and the infrared temperature sensing probe (33) corresponds to the center of the sleeve (29).

5. The crystallization point testing device of ammonium nitrate solution according to claim 1, characterized in that: The upper ends of the two electrode interfaces (35) are both fixedly connected with wires (36).

6. The testing method of the crystallization point testing device of ammonium nitrate solution according to any one of claims 1 to 5, characterized in that: The steps are as follows: S1: Add the sample into the sample cup and connect the connecting wire to the wire interface; S2: Insert the upper opening of the sample cup into the sleeve so that the upper opening of the sample cup is clamped inside the rubber ring; S3: Push the infrared temperature probe to correspond to the center of the sample cup, turn on the digital display, and display the temperature sensed by the infrared temperature probe and the conductivity sensed by the detection electrode on the digital display; S4: As the temperature gradually decreases, when the crystallization point temperature is reached, the conductivity changes suddenly, and the system automatically records and saves the temperature at this time, which is the crystallization point temperature of the ammonium nitrate solution.

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