A grain fumigation device based on phosphine mixed nitrogen gas

Abstract

The invention relates to the field of mixing technology and discloses a device for fumigating grains based on phosphine mixed nitrogen gas. The device comprises: a mobile trolley, on which a bracket is fixed; a mixing box, which is arranged on the inner side of the bracket and on the front surface of which a control box is provided; wherein the inner side of the mixing box comprises a three-way valve A, a metering component, a static mixer A, a three-way valve B, a first diverter pipe, a second diverter pipe and a second mixing component, and the metering component is arranged at the output end of the three-way valve A; by providing the three-way valve A, the static mixer A, the three-way valve B, the first diverter pipe, the second diverter pipe and the second mixing component, the device only needs one flow meter to complete metering, is easy to repair and maintain in the later stage, and also reduces processing costs; and the invention adopts secondary mixing, which can greatly avoid the problems of inaccurate mixing concentration and poor mixing uniformity caused by primary mixing, thereby increasing the practicality of the device.

Description

Technical Field

[0001] The present invention relates to the field of mixing technology, and in particular to a grain fumigation device based on phosphine-nitrogen mixed gas. Background Art

[0002] Phosphine generally refers to phosphine, an inorganic compound with the chemical formula PH3. It is a colorless, highly toxic liquefied compressed gas stored in cylinders. Low-concentration phosphine gas can kill pests in grain crops, thereby increasing the storage time of grain crops. When producing low-concentration phosphine gas, phosphine needs to be mixed with nitrogen.

[0003] The patent number is: 202320139338.X, and the name is: A phosphine cylinder gas grain fumigation device, including a phosphine cylinder, a liquid nitrogen dewar, a vaporizer control device and an exhaust gas treatment device, which can ensure the full mixing of phosphine and nitrogen, and ensure the quality of subsequent fumigation and pest control: the use of the exhaust gas treatment device is both environmentally friendly and safe.

[0004] Existing methods such as the above-mentioned patents can fully mix to reduce the phosphine concentration. However, when mixing phosphine with nitrogen, two precise flow meters are generally used to measure the mixed phosphine and nitrogen separately before mixing. This requires a lot of precise metering equipment, has a high failure rate, and requires separate repair and maintenance in the later stage, resulting in poor performance. In addition, when the phosphine stored in the cylinder is exhausted, the cylinder needs to be manually moved to a gas filling station for replacement, which is a relatively troublesome operation. Therefore, we propose a grain fumigation device based on phosphine mixed with nitrogen. Summary of the Invention

[0005] The object of the present invention is to provide a device for fumigating grain based on phosphine-nitrogen mixed gas, so as to solve the problems proposed in the above background technology that when mixing phosphine-nitrogen mixed gas, a large number of high-precision metering devices are required, the failure rate is high, and separate maintenance is required in the later stage. In addition, there is the problem that the steel cylinders storing phosphine need to be manually carried and moved, which is inconvenient.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a grain fumigation device based on phosphine mixed nitrogen gas, comprising:

[0007] A mobile trolley, wherein a bracket is fixed on the mobile trolley;

[0008] A mixing box is arranged inside the bracket, and a control box is provided on the front surface of the mixing box;

[0009] Wherein, the inner side of the mixing box includes a three-way valve A, a metering component, a static mixer A, a three-way valve B, a first diverter pipe, a second diverter pipe and a second mixing component. The metering component is arranged at the output end of the three-way valve A, and the output end of the metering component is connected to the three-way valve B for gas diversion. The first diverter pipe and the second diverter pipe are respectively arranged at the two output ends of the three-way valve B. The output end of the second diverter pipe is connected to the static mixer A for gas mixing, and the output end of the static mixer A is connected to the second mixing component;

[0010] The length of the second shunt pipe is greater than that of the first shunt pipe;

[0011] The second mixing assembly includes a gas detector, a three-way valve C, a gas storage box, a connecting pipe and a static mixer B. The gas detector is arranged at the output end of the static mixer A, and the output end of the gas detector is connected to the three-way valve C. The static mixer B is connected to the output end of the three-way valve C. The gas storage box is connected to the other output end of the three-way valve C. The lower surface of the gas storage box has a connecting pipe connected to the interior of the static mixer B, and the connecting pipe is provided with a solenoid valve. One end of the static mixer B extends to the outside of the mixing box and is formed with a connection port for docking with the grain depot fumigation system.

[0012] The gas detector is used to detect whether the concentration of the mixed phosphine is normal. If there is an abnormality, the mixed gas is introduced into the gas storage tank through the three-way valve C for temporary storage. If the stored concentration is high, then until the gas detector detects that the concentration of the inflowing mixed gas is low, the three-way valve C will introduce the low-concentration mixed gas into the inner side of the static mixer B. At the same time, the control box controls the solenoid valve on the connecting pipe to open, so that the high-concentration mixed gas enters the inner side of the static mixer B and mixes with the low-concentration mixed gas again;

[0013] A mobile rack is slidably connected to the inner side of the mobile trolley, and a gas storage tank for storing phosphine or nitrogen is provided on the mobile rack. The output end of the gas storage tank is provided with a connecting pipe connected to a mixing box, and a baffle assembly is provided on the side wall of the mobile trolley to limit the mobile rack from sliding out of the inner side of the mobile trolley;

[0014] A fixing block is fixed on the bracket, and a side wall of the fixing block is connected to a compression screw rod for limiting the shaking of the gas storage tank through a threaded portion.

[0015] Preferably, the metering component includes a pressure reducing valve and a flow meter. The pressure reducing valve is connected to the output end of the three-way valve A, and the output end of the pressure reducing valve is provided with a flow meter for measuring phosphine or nitrogen.

[0016] Preferably, the movable frame includes a base plate, a second movable wheel, a protective frame, an adjusting slide groove, a fixed plate and an adjusting bolt. The base plate is slidably installed on the inner side of the connecting slide groove opened on the inner side of the movable trolley, and a fixed plate is fixed on the base plate. The protective frame is slidably connected to the fixed plate through the adjusting slide groove opened on the side wall, and the inner side of the fixed plate is connected to the adjusting bolt that cooperates with the adjusting slide groove through a threaded portion. The lower surface of the base plate is provided with a second movable wheel.

[0017] Preferably, the cross sections of the bottom plate and the fixing plate are both T-shaped.

[0018] Preferably, the baffle assembly includes a limit baffle and a support plate, the limit baffle is rotatably connected to the side wall of the moving trolley through a shaft, and one end of the side wall of the moving trolley has a support plate for limiting the limit baffle.

[0019] Preferably, a first moving wheel is provided on the lower surface of the moving cart.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The present invention is provided with a three-way valve A, a static mixer A, a three-way valve B, a first diverter pipe, a second diverter pipe and a second mixing assembly, thereby avoiding the traditional method of separately measuring the phosphine and nitrogen in the two gas storage tanks with two pressure reducing valves and flow meters, which requires a large number of metering equipment, is prone to failure, and needs to be separately repaired and maintained in the later stage. The present device only needs one flow meter to complete the metering, is easy to repair and maintain in the later stage, and also reduces the processing cost. In addition, the present invention adopts secondary mixing, which can greatly avoid the problems of inaccurate mixing concentration and poor mixing uniformity caused by primary mixing, thereby increasing the practicality of the device.

[0022] (2) The present invention is provided with a movable frame and a baffle assembly, thereby avoiding the problem that the traditional gas tank is directly fixed to the mobile trolley by bolts and clamps, which makes it inconvenient to disassemble and replace the gas tank in the later stage, and the gas tank is heavy and inconvenient to carry and replace. The present device adopts a combined design of a movable frame and a mobile trolley. When replacing and refilling the gas in the later stage, the gas tank can be conveniently moved directly through the movable frame, which improves the convenience of movement, has a simple structure, and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 It is a structural schematic diagram of the baffle assembly of the present invention;

[0025] Figure 3 Schematic diagram of the gas mixing structure of the present invention;

[0026] Figure 4Schematic diagram of the structure of the second mixing assembly of the present invention;

[0027] Figure 5 This is a schematic diagram of the connection structure between the mobile frame and the mobile trolley of the present invention;

[0028] Figure 6 Schematic diagram of the limit baffle structure of the present invention;

[0029] Figure 7 It is a schematic diagram of the protective frame structure of the present invention.

[0030] In the figure: 1. Mobile trolley; 2. Bracket; 3. Mixing box; 4. Control box; 5. Connecting pipe; 6. Gas tank; 7. Mobile frame; 701. Bottom plate; 702. Second mobile wheel; 703. Protective frame; 704. Connecting slide; 705. Adjusting slide; 706. Fixing plate; 707. Adjusting bolt; 8. Connecting port; 9. First mobile wheel; 10. Baffle assembly; 101. Limit baffle; 102. Support plate; 11. Three-way valve A; 12. Pressure reducing valve; 13. Flow meter; 14. Static mixer A; 15. Three-way valve B; 161. First diverter pipe; 162. Second diverter pipe; 17. Gas detector; 181. Three-way valve C; 182. Gas tank; 183. Connecting pipe; 19. Static mixer B; 20. Fixing block; 21. Pressing screw. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] See also Figure 1-Figure 7 The present invention provides a technical solution: a grain fumigation device based on phosphine mixed nitrogen gas, comprising:

[0033] A movable trolley 1, on which a bracket 2 is fixed;

[0034] A mixing box 3 is provided inside the bracket 2, and a control box 4 is provided on the front surface of the mixing box 3;

[0035] Among them, the inside of the mixing box 3 includes a three-way valve A11, a metering component, a static mixer A14, a three-way valve B15, a first diverter pipe 161, a second diverter pipe 162 and a second mixing component. The metering component is arranged at the output end of the three-way valve A11, and the output end of the metering component is connected to the three-way valve B15 for gas diversion. The first diverter pipe 161 and the second diverter pipe 162 are respectively arranged at the two output ends of the three-way valve B15, and the output end of the second diverter pipe 162 is connected to the static mixer A14 for gas mixing, and the output end of the static mixer A14 is connected to the second mixing component;

[0036] It is convenient to measure the volume of phosphine and nitrogen separately by one flow meter 13, and then converge the two gases after measurement to mix them, avoiding the need for two flow meters 13, which have the inconvenience of high failure rate, high production cost, and the need for separate maintenance in the later stage. Moreover, by using one flow meter 13, when the flow meter 13 fails and the volume is too high or too low, since the phosphine and nitrogen use the same flow meter 13, the volume of both will be consistently too high or too low, and the concentration of the mixed gas will tend to be normal. If two flow meters 13 are used, when one flow meter 13 fails and the volume is too high and the other is too low, the volume of phosphine and nitrogen will differ greatly, affecting the ratio of the mixed gas.

[0037] The length of the second shunt pipe 162 is greater than that of the first shunt pipe 161;

[0038] It is convenient to make the gas measured first flow over a long distance and for a long time, so that it can meet and mix with the gas measured later;

[0039] The second mixing assembly includes a gas detector 17, a three-way valve C181, an air storage box 182, a connecting pipe 183 and a static mixer B19. The gas detector 17 is arranged at the output end of the static mixer A14, and the output end of the gas detector 17 is connected to the three-way valve C181. The static mixer B19 is connected to the output end of the three-way valve C181. The air storage box 182 is connected to the other output end of the three-way valve C181. The lower surface of the air storage box 182 has a connecting pipe 183 connected to the inside of the static mixer B19, and a solenoid valve is provided on the connecting pipe 183. One end of the static mixer B19 extends to the outside of the mixing box 3 and is formed with a connection port 8 for docking with the grain depot fumigation system;

[0040] It is convenient to further detect the mixed gas. When there is an abnormality, a second mixing is performed to improve the accuracy of the mixed gas concentration;

[0041] The gas detector 17 detects whether the mixed phosphine concentration is normal. If there is an abnormality, the mixed gas is introduced into the gas storage box 182 through the three-way valve C181 for temporary storage. If the stored concentration is high, then until the gas detector 17 detects that the concentration of the inflowing mixed gas is low, the three-way valve C181 introduces the low-concentration mixed gas into the inside of the static mixer B19. At the same time, the control box 4 controls the solenoid valve on the connecting pipe 183 to open, allowing the high-concentration mixed gas to enter the static mixer B19 and mix with the low-concentration mixed gas again.

[0042] A movable frame 7 is slidably connected to the inner side of the movable trolley 1. A gas storage tank 6 for storing phosphine or nitrogen is provided on the movable frame 7. A connecting pipe 5 connected to the mixing box 3 is provided at the output end of the gas storage tank 6. A baffle assembly 10 is provided on the side wall of the movable trolley 1 to limit the movable frame 7 from sliding out from the inner side of the movable trolley 1.

[0043] The gas storage tank 6 can be easily moved by the mobile frame 7, thus avoiding the troublesome and laborious manual handling and movement. The device is convenient for improving the convenience of later maintenance and is conducive to replacing the gas storage tank 6 when the gas inside is exhausted.

[0044] A fixing block 20 is fixed on the bracket 2, and a compression screw 21 is connected to the side wall of the fixing block 20 through a threaded portion to limit the shaking of the gas storage tank 6;

[0045] It is convenient to quickly limit and fix the gas storage tanks 6 with different outer diameters, thereby avoiding the shaking of the gas storage tanks 6 during the movement of the mobile trolley 1.

[0046] Preferably, the metering assembly includes a pressure reducing valve 12 and a flow meter 13. The pressure reducing valve 12 is connected to the output end of the three-way valve A11, and the output end of the pressure reducing valve 12 is provided with a flow meter 13 for measuring phosphine or nitrogen.

[0047] It is convenient to measure mixed gases.

[0048] Preferably, the movable frame 7 includes a bottom plate 701, a second movable wheel 702, a protective frame 703, an adjusting slide 705, a fixing plate 706 and an adjusting bolt 707. The bottom plate 701 is slidably mounted on the inner side of the connecting slide 704 opened on the inner side of the movable trolley 1, and a fixing plate 706 is fixed on the bottom plate 701. The protective frame 703 is slidably connected to the fixing plate 706 through the adjusting slide 705 opened on the side wall, and the inner side of the fixing plate 706 is connected to the adjusting bolt 707 that cooperates with the adjusting slide 705 through a threaded portion. The lower surface of the bottom plate 701 has a second movable wheel 702.

[0049] The gas storage tank 6 can be conveniently moved by the second movable wheel 702 , and the movable trolley 1 can be supported by the second movable wheel 702 during grain fumigation, thereby improving the utilization effect of the second movable wheel 702 .

[0050] Preferably, the cross sections of the bottom plate 701 and the fixing plate 706 are both T-shaped.

[0051] Preferably, the baffle assembly 10 includes a limit baffle 101 and a support plate 102. The limit baffle 101 is rotatably connected to the side wall of the mobile trolley 1 through a shaft, and one end of the side wall of the mobile trolley 1 has a support plate 102 for limiting the position of the limit baffle 101.

[0052] It is convenient to quickly fix the movable frame 7 and the movable trolley 1 to form a whole.

[0053] Preferably, the lower surface of the mobile trolley 1 is provided with a first moving wheel 9;

[0054] The mobile trolley 1 can be easily moved to fumigate different grain depots.

[0055] The working principle and use process of the present invention are as follows: when in use, phosphine and nitrogen are stored respectively by two gas storage tanks 6, and then connected to the three-way valve A11 through the connecting pipe 5. The three-way valve A11 opens the nitrogen passage inside, so that the nitrogen enters the three-way valve B15 after the volume is measured by the pressure reducing valve 12 and the flow meter 13, and is shunted to the second shunt pipe 162 with a larger length through the three-way valve B15. Then the three-way valve A11 closes the nitrogen passage and opens the phosphine gas passage, and then is shunted to the first shunt pipe 161 through the measurement and the three-way valve B15. Since the length of the second shunt pipe 162 is greater than that of the first shunt pipe 161, the finally measured gases are simultaneously gathered in the inner side of the static mixer A14 for the first mixing. The gas detector 17 detects whether the phosphine concentration after mixing is normal. When there is an abnormality, the mixed gas is introduced into the gas storage box 182 through the three-way valve C181 for temporary storage. If the stored concentration is high, the gas is shunted to the first shunt pipe 161. , then until the gas detector 17 detects that the concentration of the flowing mixed gas is low, the three-way valve C181 introduces the low-concentration mixed gas into the inside of the static mixer B19, and at the same time the control box 4 controls the solenoid valve on the connecting pipe 183 to open, so that the high-concentration mixed gas enters the inside of the static mixer B19 and mixes with the low-concentration mixed gas again, and then is discharged into the grain depot fumigation system through the connecting port 8. When the concentration is normal, it will be directly introduced into the inside of the static mixer B19 through the three-way valve C181, and after being mixed evenly again by the static mixer B19, it will be discharged into the grain depot fumigation system through the connecting port 8 to process the grain. When the gas inside the gas storage tank 6 is consumed, the limit baffle 101 is rotated upwards, and the bottom plate 701 is pulled out from the inside of the connecting chute 704, and then the gas storage tank 6 is moved to the warehouse for replacement through the second moving wheel 702 on the lower surface of the bottom plate 701. The operation is convenient and avoids the inconvenience of manual handling.

[0056] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A grain fumigation device based on phosphine mixed nitrogen gas, characterized in that: include: A movable trolley (1), wherein a bracket (2) is fixed on the movable trolley (1); A mixing box (3) is arranged inside the bracket (2), and a control box (4) is provided on the front surface of the mixing box (3); The mixing box (3) includes a three-way valve A (11), a metering component, a static mixer A (14), a three-way valve B (15), a first diverter pipe (161), a second diverter pipe (162) and a second mixing component inside. The metering component is arranged at the output end of the three-way valve A (11), the output end of the metering component is connected to the three-way valve B (15) for gas diversion, the first diverter pipe (161) and the second diverter pipe (162) are respectively arranged at the two output ends of the three-way valve B (15), the output end of the second diverter pipe (162) is connected to the static mixer A (14) for gas mixing, and the output end of the static mixer A (14) is connected to the second mixing component. The length of the second shunt pipe (162) is greater than the length of the first shunt pipe (161); The second mixing assembly includes a gas detector (17), a three-way valve C (181), an air storage box (182), a connecting pipe (183) and a static mixer B (19), wherein the gas detector (17) is arranged at the output end of the static mixer A (14), and the output end of the gas detector (17) is connected to the three-way valve C (181), the static mixer B (19) is connected to the output end of the three-way valve C (181), the air storage box (182) is connected to the other output end of the three-way valve C (181), and the lower surface of the air storage box (182) has a connecting pipe (183) connected to the inside of the static mixer B (19), and a solenoid valve is provided on the connecting pipe (183), and one end of the static mixer B (19) extends to the outside of the mixing box (3) and is formed with a connection port (8) for docking with the grain depot fumigation system; The gas detector (17) detects whether the concentration of the mixed phosphine is normal. If an abnormality exists, the mixed gas is introduced into the gas storage box (182) for temporary storage through the three-way valve C (181). If the stored concentration is high, the three-way valve C (181) introduces the low-concentration mixed gas into the inner side of the static mixer B (19) until the gas detector (17) detects that the concentration of the inflowing mixed gas is low. At the same time, the control box (4) controls the solenoid valve on the connecting pipe (183) to open, so that the high-concentration mixed gas enters the inner side of the static mixer B (19) and mixes with the low-concentration mixed gas again; A movable frame (7) is slidably connected to the inner side of the movable trolley (1); a gas storage tank (6) for storing phosphine or nitrogen is provided on the movable frame (7); and a connecting pipe (5) connected to a mixing box (3) is provided at the output end of the gas storage tank (6); and a baffle assembly (10) for limiting the movable frame (7) from sliding out from the inner side of the movable trolley (1) is provided on the side wall of the movable trolley (1); A fixing block (20) is fixed on the bracket (2), and a side wall of the fixing block (20) is connected to a compression screw (21) for limiting the shaking of the gas storage tank (6) through a threaded portion.

2. The grain fumigation device based on phosphine-nitrogen mixed gas according to claim 1, characterized in that: The metering component comprises a pressure reducing valve (12) and a flow meter (13). The pressure reducing valve (12) is connected to the output end of the three-way valve A (11), and the output end of the pressure reducing valve (12) is provided with a flow meter (13) for measuring phosphine or nitrogen.

3. The grain fumigation device based on phosphine-nitrogen mixed gas according to claim 1, characterized in that: The movable frame (7) comprises a bottom plate (701), a second movable wheel (702), a protective frame (703), an adjusting chute (705), a fixing plate (706) and an adjusting bolt (707); the bottom plate (701) is slidably mounted on the inner side of a connecting chute (704) provided on the inner side of the movable trolley (1); and a fixing plate (706) is fixed on the bottom plate (701); the protective frame (703) is slidably connected to the fixing plate (706) through an adjusting chute (705) provided on the side wall; and an adjusting bolt (707) matching the adjusting chute (705) is connected to the inner side of the fixing plate (706) through a threaded portion; and the lower surface of the bottom plate (701) has a second movable wheel (702).

4. The grain fumigation device based on phosphine-nitrogen mixed gas according to claim 3, characterized in that: The cross sections of the bottom plate (701) and the fixing plate (706) are both T-shaped.

5. The grain fumigation device based on phosphine mixed nitrogen gas according to claim 1, characterized in that: The baffle assembly (10) comprises a limiting baffle (101) and a support plate (102); the limiting baffle (101) is rotatably connected to the side wall of the moving trolley (1) via a shaft, and one end of the side wall of the moving trolley (1) has a support plate (102) for limiting the position of the limiting baffle (101).

6. The grain fumigation device based on phosphine mixed nitrogen gas according to claim 1, characterized in that: The lower surface of the movable trolley (1) is provided with a first movable wheel (9).

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