Device and method for monitoring expansion pressure of top of grain under long-term storage condition

Abstract

The invention belongs to the field of explosive performance testing, and mainly relates to a device and a method for monitoring expansion pressure at the top of a grain under a long-term storage condition. The device comprises a grain assembly, a constant temperature control device, an expansion pressure acquisition device and an upper computer, the grain assembly comprises a grain shell, a thin cover, a gasket, a pressure sensor and a pressure head, a spiral oil duct is arranged in the grain shell, two circulating liquid inlets and outlets communicated with the spiral oil duct are formed in the side wall of the grain shell, and the two circulating liquid inlets and outlets are communicated with the spiral oil duct. An inlet and an outlet of circulating liquid are connected with the constant-temperature control device to control the temperature of the grain shell. According to the device provided by the invention, the pressure of the bottom and the side surface of the solid grain can be all concentrated to the top of the grain, and then the pressure sensor is mounted at the top of the grain, so that the purpose of measuring the expansion pressure of the whole grain is achieved. The method is easy to operate, high in accuracy and high in success rate, and the problem that the expansion pressure of the top of the grain is difficult to monitor under the long-term storage condition is effectively solved.

Description

Technical Field

[0001] The invention belongs to the field of explosive performance testing, and mainly relates to a device and method for monitoring the expansion pressure of a charge column top under long-term storage conditions. Background Art

[0002] Generally, high-energy materials that achieve target damage are made into explosives according to specific processes. The expansion pressure of the explosive refers to the static pressure generated by the charge under the constraint of the upper cover when it expands at a constant temperature. If the expansion pressure of the explosive is too large, it will cause structural damage to the entire explosive and may also cause an explosion. Therefore, measuring the expansion pressure of the explosive when it is stored for a long time under constant temperature conditions is of great significance to ensure the quality and safety of the explosive.

[0003] The document with the patent number "CN201710796839.4" discloses "a system and method for simulating the expansion pressure of projectile explosive charge". The system consists of a charge simulation chamber, an expansion pressure sensor assembly, a sealing compression nut, an explosive component, a constant temperature system, a temperature-compensated fiber Bragg grating, a fiber demodulation system, and a measurement control system. It can directly measure the thermal expansion pressure of projectile explosive charge and semi-solid explosives, thereby characterizing their thermal expansion effects. This solution has the following problems: Since the transmission optical fiber is bent and arranged at the top and inner wall of the charge column, the fiber Bragg grating is easy to be broken and bent, thereby affecting the accuracy of the grating area, making the operation more difficult during the test, with a high failure rate and not easy to store for a long time. The pressure measuring fiber Bragg grating is arranged horizontally on the top of the explosive column. Due to the different operation processes during manual arrangement, the arrangement accuracy cannot be unified each time, which will cause errors; and the fiber Bragg grating is easily affected by the outside world, and a slight touch or fluctuation will affect the change of the value; at the same time, with the change of the outside temperature, such as rainy and snowy days, high temperature, etc., it will affect the fiber Bragg grating data, greatly reducing the accuracy of the experiment; the document with the patent number "CN201811515203.9" discloses "a test device for detecting the expansion amount of explosive column under heating state", and the test device includes a height adjustment pole, a displacement sensor, a fine adjustment nut, a sensor fixing frame, a weight group, a weight tray, a handle rod, a guide sleeve, an upper shelf, a thermometer, a load rod, a pressure head, a sample, a sample support block and a lower shelf. The test device can test the expansion amount of the explosive column at a set temperature, and can detect all the data of the explosive column in the process of thermal expansion in real time, and automatically draw the deformation curve through a computer. This solution has the following problems: Since the boiling point of water under standard atmospheric pressure is only 100°C, and the experiment requires the temperature of the medicine column to rise to above 100°C under ideal conditions, when the water temperature exceeds 100°C, the temperature accuracy will gradually decrease, affecting the temperature of the medicine column and thus the accuracy of the experiment. Since the water bath heating method is used, there will be uneven heating of various parts, resulting in errors in the accuracy of the detected data, and due to the complexity of the device and the different operating processes of different operators, it is difficult to achieve uniformity, and it will be difficult to popularize it.

[0004] It can be seen from the above documents that the common problems are: the pressure measurement fiber Bragg grating test is difficult to operate, the fiber Bragg grating is easy to break, and the failure rate is high; the water bath heating method has errors and uneven heating at temperatures above 100°C; long-term experiments and storage are not possible, so the lack of equipment and means to monitor the expansion pressure at the top of the grain under long-term storage conditions has become a key research direction for researchers in this field. Summary of the invention

[0005] The present invention provides a device and method for monitoring the expansion pressure of a drug column top under long-term storage conditions, aiming to solve the problem that the expansion pressure of existing drug columns is difficult to monitor when stored under long-term constant temperature conditions.

[0006] To achieve the purpose of the present invention, the technical scheme proposed by the present invention is as follows: a device for monitoring the expansion pressure of a medicine column top under long-term storage conditions, comprising a medicine column assembly, a constant temperature control device, an expansion pressure acquisition device and a host computer, wherein the medicine column assembly comprises a cylindrical medicine column shell, wherein a spiral oil channel is arranged in the side wall of the medicine column shell, and its inlet and outlet holes are respectively connected to an oil outlet joint and an oil inlet joint arranged on the side wall, and the other end of the oil outlet joint and the oil inlet joint are connected to the constant temperature control device; a circular thin cover is installed on the top of the medicine column shell, a thickened gasket with the same inner diameter as the medicine column shell is arranged on the upper part of the thin cover, and a spoke pressure sensor arranged coaxially with the medicine column shell is installed on the upper part of the thickened gasket; the oil outlet joint and the oil inlet joint are respectively located on the upper and lower sides of the medicine column shell; an annular outer eaves is designed on the upper end of the medicine column shell, and screw holes are arranged on the annular outer eaves, and screws tightly connect the spoke pressure sensor, the thickened gasket, the thin cover and the medicine column shell together.

[0007] Furthermore, a columnar pressure head is fixedly installed at the center position of the spoke-type pressure sensor, and the lower part of the columnar pressure head is tightly fitted to the upper part of the thin cover.

[0008] Furthermore, the spoke-type pressure sensor and the columnar pressure head are tightly connected through a threaded structure and fixed by thread glue.

[0009] Furthermore, the above-mentioned constant temperature control device is a constant temperature circulating oil bath.

[0010] Furthermore, the above-mentioned method for monitoring the expansion pressure measurement device of the drug column top under long-term storage conditions comprises the following steps:

[0011] Step 1: Place the cylindrical drug column into the drug column shell, requiring the cylindrical drug column to fit tightly with the drug column shell, and keep the upper end flush after being placed in the drug column shell; then stack the thin cover and gasket on the upper end surface of the drug column shell, install the columnar pressure head on the spoke pressure sensor, place the spoke pressure sensor on the upper part of the gasket, press the columnar pressure head onto the thin cover, and multiple bolts pass through the spoke pressure sensor, gasket, thin cover and the annular outer edge of the drug column shell, tighten all structures, and complete the assembly of the drug column assembly;

[0012] Step 2: Connect the other end of the spoke pressure sensor to the expansion pressure collection device, and connect the output end of the expansion pressure collection device to the host computer to complete the construction of the entire monitoring system; connect the oil inlet and outlet of the constant temperature circulating oil bath tank pump in the constant temperature control device to the oil outlet joint and the oil inlet joint on the medicine column shell to build a temperature control device;

[0013] Step 3: Set the thermostatic control device to a fixed temperature, open the oil outlet joint and the oil inlet joint, and the liquid oil circulates in the spiral oil channel in the drug column shell;

[0014] Step 4: The spoke pressure sensor uploads the collected pressure data to the expansion pressure acquisition device. After data processing, the expansion pressure acquisition device transmits the data to the host computer for display and storage. The host computer can observe the pressure change and temperature change at the top of the medicine column, the real-time data value can be observed through the data window, the pressure change can be observed through the curve, and the data stored in EXCAL can be analyzed and processed by itself;

[0015] Step 5: Continue monitoring for a period of time and connect all data points to obtain the expansion pressure curve and temperature curve. Under constant temperature conditions, the expansion pressure value at the top of the medicine column can be analyzed as it changes with temperature and time.

[0016] Compared with the existing method, the present invention has the following beneficial effects:

[0017] 1. A device for measuring the pressure at the top of a drug column designed by the present invention comprises a fixedly connected drug column shell, a gasket, a pressure head, a thin cover, a pressure sensor and other structures, which can concentrate all the pressure at the bottom and side of the solid drug column to the top of the drug column. By installing a pressure sensor at the top of the drug column, the expansion pressure at the top of the drug column can be accurately measured.

[0018] 2. The medicine column shell designed in the present invention is provided with a spiral oil channel inside, and two inlets and outlets for circulating liquid connected to the spiral oil channel are installed on the side wall of the medicine column shell. The inlet and outlet of the circulating liquid are connected to the constant temperature control device, which can realize precise temperature control of the medicine column shell.

[0019] 3. The present invention has a simple structure and is easy to install. By selecting pressure sensors with different ranges, the expansion pressure at the top of medicine columns of various sizes can be measured. The operation is simple, the accuracy is high, and the success rate is high.

[0020] 4. The method for testing the top pressure of a drug column proposed in the present invention solves the problem of measuring the top expansion pressure of a solid drug column under the constraint condition. The present invention fills the gap in the device for monitoring the top expansion pressure of a drug column and has a wide range of applications, and is applicable to both semi-solid and solid drug columns. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the device for measuring the expansion pressure of the top of the drug column under long-term storage conditions;

[0022] Figure 2 The pressure and temperature at the top of the grain vary with time.

[0023] The following are the descriptions of the reference numerals:

[0024] 1-charge column shell; 2-spiral oil channel; 3-thin cover; 4-gasket; 5-spoke pressure sensor; 6-column pressure head; 7-oil outlet connector; 8-oil inlet connector; 9-constant temperature control device; 10-expansion pressure acquisition equipment; 11-host computer. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is clearly and completely described below in conjunction with the specific embodiments and drawings of the present invention.

[0026] See also Figure 1 The present invention provides a device for monitoring the expansion pressure of the top of a drug column under long-term storage conditions, comprising a drug column assembly, a constant temperature control device 9, an expansion pressure acquisition device 10 and a host computer 11. The drug column assembly comprises a cylindrical drug column shell 1. In the drug column assembly, a spiral oil channel 2 is arranged in the side wall of the drug column shell 1, and its inlet and outlet holes are respectively connected to an oil outlet joint 7 and an oil inlet joint 8 arranged on the side wall. The other ends of the oil outlet joint 7 and the oil inlet joint 8 are connected to the constant temperature control device 9, so that the precise temperature control of the drug column shell can be achieved; the drug column shell 1 A circular thin cover 3 is installed on the top, and a thickened gasket 4 with the same inner diameter as the medicine column shell 1 is arranged on the upper part of the thin cover 3, and a spoke-type pressure sensor 5 coaxially arranged with the medicine column shell 1 is installed on the upper part of the thickened gasket 4; the oil outlet joint 7 and the oil inlet joint 8 are respectively located on the upper and lower sides of the medicine column shell 1; the upper end of the medicine column shell 1 is designed with an annular outer edge, and screw holes are arranged on the annular outer edge, and the screws tightly connect the spoke-type pressure sensor 5, the thickened gasket 4, the thin cover 3 and the medicine column shell 1 together; 8 screws are used in this embodiment.

[0027] A columnar pressure head 6 is fixedly mounted at the center of the spoke-type pressure sensor 5 , and the lower part of the columnar pressure head 6 is tightly fitted to the upper part of the thin cover 3 .

[0028] The spoke-type pressure sensor 5 and the columnar pressure head 6 are tightly connected through a threaded structure and fixed by thread glue.

[0029] The constant temperature control device 9 is a constant temperature circulating oil bath; the selected constant temperature circulating oil bath is equipped with a compressor and a temperature control device, which can heat up and cool down, control the heating rate, and accurately display the temperature. The constant temperature circulating oil bath is equipped with a pump, and the oil inlet and oil outlet of the pump are connected to the above-mentioned oil outlet connector 7 and the oil inlet connector 8. The constant temperature control device 9 is an electric heating device, which can control the heating rate, accurately display the temperature, and control the temperature to be constant.

[0030] The monitoring method of the device for monitoring the expansion pressure at the top of a drug column under long-term storage conditions comprises the following steps:

[0031] Step 1: Place the cylindrical drug column into the drug column shell 1. The cylindrical drug column is required to fit tightly with the drug column shell 1 and keep the upper end flush after being placed into the drug column shell 1. Then, the thin cover 3 and the gasket 4 are stacked on the upper end surface of the drug column shell 1, and the columnar pressure head 6 is installed on the spoke pressure sensor 5. The spoke pressure sensor 5 is placed on the upper part of the gasket 4, and the columnar pressure head 6 is pressed onto the thin cover 3. Eight bolts pass through the spoke pressure sensor 5, the gasket 4, the thin cover 3 and the annular outer edge of the drug column shell 1, and all structures are tightened to complete the assembly of the drug column assembly;

[0032] Step 2: Connect the other end of the spoke pressure sensor 5 to the expansion pressure acquisition device 10, and connect the output end of the expansion pressure acquisition device 10 to the host computer 11 to complete the construction of the entire monitoring system; connect the oil inlet and outlet of the constant temperature circulating oil bath tank pump in the constant temperature control device 9 to the oil outlet connector 7 and the oil inlet connector 8 on the drug column shell 1 to build a temperature control device;

[0033] Step 3: According to the experimental requirements, the constant temperature control device 9 is set to a fixed temperature not exceeding the upper temperature limit that causes the shape change of the medicine column, and the oil outlet joint 7 and the oil inlet joint 8 are opened, and the liquid oil circulates in the spiral oil channel 2 in the medicine column housing 1;

[0034] Step 4: The spoke pressure sensor 5 uploads the collected pressure data to the expansion pressure collection device 10. The expansion pressure collection device 10 transmits the data to the host computer 11 for display and storage after data processing. The host computer 11 is used to observe the pressure change and temperature change at the top of the medicine column. The real-time data value can be observed through the data window, and the pressure change can also be observed through the curve. The data stored in EXCAL can also be analyzed and processed by itself;

[0035] Step 5: Continue monitoring for a period of time and connect all data points to obtain the expansion pressure curve and temperature curve. Figure 2 , it is possible to analyze how the expansion pressure at the top of the medicine column changes with temperature and time under constant temperature conditions.

[0036] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A device for monitoring the expansion pressure at the top of a drug column under long-term storage conditions, characterized in that: The invention comprises a drug column assembly, a thermostatic control device (9), an expansion pressure acquisition device (10) and a host computer (11), wherein the drug column assembly comprises a cylindrical drug column shell (1), wherein a spiral oil channel (2) is arranged in the side wall of the drug column shell (1), wherein the inlet and outlet holes of the spiral oil channel (2) are respectively connected to an oil outlet joint (7) and an oil inlet joint (8) arranged on the side wall, wherein the other ends of the oil outlet joint (7) and the oil inlet joint (8) are connected to the thermostatic control device (9), and a circular thin cover (3) is installed on the top of the drug column shell (1), wherein the thin cover (3) is provided with a circular thin cover (3) and a circular thin cover (3) is provided on the top of the drug column shell (1). A thickened gasket (4) having the same inner diameter as the charge shell (1) is arranged at the upper part, and a spoke-type pressure sensor (5) arranged coaxially with the charge shell (1) is installed at the upper part of the thickened gasket (4); an oil outlet joint (7) and an oil inlet joint (8) are respectively located at the upper and lower sides of the charge shell (1); an annular outer edge is designed at the upper end of the charge shell (1), and screw holes are arranged on the annular outer edge, and screws are used to tightly connect the spoke-type pressure sensor (5), the thickened gasket (4), the thin cover (3) and the charge shell (1) together.

2. The device for monitoring the expansion pressure of the top of the drug column under long-term storage conditions according to claim 1, characterized in that: A columnar pressure head (6) is fixedly mounted at the center of the spoke-type pressure sensor (5), and the lower part of the columnar pressure head (6) is tightly fitted to the upper part of the thin cover (3).

3. The device for monitoring the expansion pressure of the top of the drug column under long-term storage conditions according to claim 2, characterized in that: The spoke-type pressure sensor (5) and the columnar pressure head (6) are tightly connected via a threaded structure and fixed via thread glue.

4. The device for monitoring the expansion pressure at the top of a drug column under long-term storage conditions according to any one of claims 1 to 3, characterized in that: The constant temperature control device (9) is a constant temperature circulating oil bath.

5. The monitoring method of the device for monitoring the expansion pressure of the top of the drug column under long-term storage conditions according to claim 1, characterized in that: The following steps are involved: Step 1: Place the cylindrical drug column into the drug column shell (1), requiring the cylindrical drug column to fit tightly with the drug column shell (1), and keep the upper end flush after being placed in the drug column shell (1); then, stack the thin cover (3) and the gasket (4) on the upper end surface of the drug column shell (1), install the columnar pressure head (6) on the spoke-type pressure sensor (5), place the spoke-type pressure sensor (5) on the upper part of the gasket (4), press the columnar pressure head (6) onto the thin cover (3), and pass a plurality of bolts through the spoke-type pressure sensor (5), the gasket (4), the thin cover (3) and the annular outer edge of the drug column shell (1), tighten all the structures, and complete the assembly of the drug column assembly; Step 2: Connect the other end of the spoke-type pressure sensor (5) to the expansion pressure acquisition device (10), and connect the output end of the expansion pressure acquisition device (10) to the host computer (11), thereby completing the construction of the entire monitoring system; connect the oil inlet and outlet of the constant temperature circulating oil bath tank pump in the constant temperature control device (9) to the oil outlet connector (7) and the oil inlet connector (8) on the drug column shell (1), respectively, to build a temperature control device; Step 3: according to the experimental requirements, the constant temperature control device (9) is set to a fixed temperature, the oil outlet joint (7) and the oil inlet joint (8) are opened, and the liquid oil circulates in the spiral oil passage (2) in the drug column housing (1); Step 4: The spoke-type pressure sensor (5) uploads the collected pressure data to the expansion pressure collection device (10). The expansion pressure collection device (10) transmits the data to the host computer (11) for display and storage after data processing. The host computer (11) observes the pressure change and temperature change at the top of the medicine column, observes the real-time data value through the data window, observes the pressure change through the curve, and performs analysis and processing by itself through the data stored in EXCAL; Step 5: Continue monitoring for a period of time, connect all data points to obtain the expansion pressure curve and temperature curve, and analyze how the expansion pressure value at the top of the medicine column changes with temperature and time under constant temperature conditions.

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