Grain fumigation device based on phosphine mixed nitrogen

Abstract

The invention relates to the technical field of mixing, and discloses a grain fumigation device based on phosphorane mixed nitrogen, comprising: a moving trolley on which a bracket is fixed; the mixing box is arranged on the inner side of the support, and a control box is arranged on the front surface of the mixing box; wherein the inner side of the mixing box comprises a three-way valve A, a metering assembly, a static mixer A, a three-way valve B, a first flow dividing pipe, a second flow dividing pipe and a second mixing assembly, and the metering assembly is arranged at the output end of the three-way valve A; through the arrangement of the three-way valve A, the static mixer A, the three-way valve B, the first flow dividing pipe, the second flow dividing pipe and the second mixing assembly, the device can complete metering only through one flow meter, later overhaul and maintenance are easy, the machining cost is reduced, secondary mixing is adopted, and the working efficiency is improved. The problems of inaccurate mixing concentration and poor mixing uniformity caused by primary mixing can be greatly avoided, and the practicability of the device is improved.

Description

Technical Field

[0001] The 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 It is a colorless, highly toxic liquefied compressed gas stored in a cylinder. Low-concentration phosphine gas can kill pests in grain crops, so as to increase the storage time of grain crops. When making 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 centralized 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 insecticide control: the use of the exhaust gas treatment device is both environmentally friendly and safe.

[0004] The existing patents such as the above can fully mix to reduce the concentration of phosphine, but when mixing phosphine with nitrogen, two precise flow meters are generally used to measure the mixed phosphine and nitrogen respectively, and then mix them. This requires a lot of precise metering equipment, with a high failure rate, and needs to be repaired and maintained separately in the later stage, and the use effect is not good. In addition, when the phosphine stored in the cylinder is consumed, it is necessary to manually move the cylinder to the gas filling place for replacement, which is more troublesome. For this reason, 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 grain fumigation device based on phosphine mixed with nitrogen, so as to solve the problems proposed in the above background technology that when mixing phosphine mixed with nitrogen, 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 a problem that the steel cylinder storing phosphine needs to be manually transported and moved, which is inconvenient.

[0006] To achieve the above object, the present invention provides the following technical solution: a grain fumigation device based on phosphine mixed nitrogen gas, comprising: A mobile trolley, on which a bracket is fixed; A mixing box is arranged inside the bracket, and a control box is arranged on the front surface of the mixing box; 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.

[0007] Preferably, the metering component comprises 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 metering phosphine or nitrogen.

[0008] Preferably, the length of the second shunt tube is greater than that of the first shunt tube.

[0009] Preferably, 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, and the lower surface of the gas storage box has a connecting pipe connected to the interior of the static mixer B, and a solenoid valve is arranged on the connecting pipe. One end of the static mixer B extends to the outside of the mixing box and is formed with a connecting port for docking with the grain depot fumigation system.

[0010] Preferably, a mobile frame is slidably connected to the inner side of the mobile cart, a gas tank for storing phosphine or nitrogen is provided on the mobile frame, and a connecting pipe connected to a mixing box is provided at the output end of the gas tank, and a baffle assembly for limiting the mobile frame from sliding out from the inner side of the mobile cart is provided on the side wall of the mobile cart.

[0011] 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 a 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 an adjusting slide groove opened on the side wall, and the inner side of the fixed plate is connected to an adjusting bolt that cooperates with the adjusting slide groove through a threaded portion, and the lower surface of the base plate is provided with a second movable wheel.

[0012] Preferably, the cross-sections of the bottom plate and the fixing plate are both "T"-shaped.

[0013] 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 an axle rod, and one end of the side wall of the moving trolley has a support plate for limiting the position of the limit baffle.

[0014] Preferably, 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, a first moving wheel is provided on the lower surface of the moving vehicle.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention is provided with a three-way valve A, a static mixer A, a three-way valve B, a first shunt pipe, a second shunt pipe and a second mixing assembly, thereby avoiding the need for two pressure reducing valves and flow meters to separately measure the phosphine and nitrogen in the two gas storage tanks. The conventional method requires a large number of metering devices, which are prone to failure and need to be repaired and maintained separately in the later stage. The present device only needs one flow meter to complete the metering, which 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.

[0017] (2) The present invention is provided with a mobile frame and a baffle assembly to avoid the traditional gas tank being directly fixed to the mobile trolley by bolts and clamps, which makes it inconvenient to disassemble and replace the gas tank in the future. In addition, the gas tank is heavy and inconvenient to carry and replace. The device adopts a combined design of a mobile frame and a mobile trolley. When replacing and refilling the gas tank in the future, the gas tank can be conveniently moved directly by the mobile frame, which improves the convenience of movement, has a simple structure, and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the structure of the baffle assembly of the present invention; Figure 3 It is a schematic diagram of the gas mixing structure of the present invention; Figure 4 is a schematic structural diagram of a second mixing assembly of the present invention; Figure 5 It is a schematic diagram of the connection structure between the mobile frame and the mobile trolley of the present invention; Figure 6 It is a schematic diagram of the limit baffle structure of the present invention; Figure 7 It is a schematic diagram of the protective frame structure of the present invention.

[0019] 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 moving 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 shunt pipe; 162. second shunt 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

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-Figure 7 The present invention provides a technical solution: a grain fumigation device based on phosphine mixed nitrogen gas, comprising: A mobile trolley 1, on which a bracket 2 is fixed; A mixing box 3 is arranged inside the bracket 2, and a control box 4 is arranged on the front surface of the mixing box 3; Among them, the inner side 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; It is convenient to measure the volume of phosphine and nitrogen respectively through a flow meter 13, and then converge the two gases after measurement for mixing, 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 volumes of the two 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.

[0022] 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 metering phosphine or nitrogen; It is convenient to measure mixed gases.

[0023] Preferably, the length of the second shunt pipe 162 is greater than the length of the first shunt pipe 161; This makes it easier for the gas that is metered first to flow over a longer distance and for a longer time, so that it can meet and mix with the gas that is metered later.

[0024] Preferably, 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, and 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 arranged on the connecting pipe 183, and 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; 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.

[0025] Preferably, a moving frame 7 is slidably connected to the inner side of the moving trolley 1, a gas storage tank 6 for storing phosphine or nitrogen is arranged on the moving frame 7, and a connecting pipe 5 connected to the mixing box 3 is arranged at the output end of the gas storage tank 6, and a baffle assembly 10 for limiting the moving frame 7 from sliding out of the inner side of the moving trolley 1 is arranged on the side wall of the moving trolley 1; 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.

[0026] Preferably, the moving frame 7 includes a bottom plate 701, a second moving wheel 702, a protective frame 703, an adjusting slide groove 705, a fixing plate 706 and an adjusting bolt 707. The bottom plate 701 is slidably mounted on the inner side of a connecting slide groove 704 provided on the inner side of the moving 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 groove 705 provided on the side wall, and the fixing plate 706 is connected to an adjusting bolt 707 matched with the adjusting slide groove 705 through a threaded portion on the inner side thereof. The bottom plate 701 has a second moving wheel 702 on its lower surface. The gas storage tank 6 can be conveniently moved by the second moving wheel 702 , and the second moving wheel 702 can support the moving trolley 1 during grain fumigation, thereby improving the utilization effect of the second moving wheel 702 .

[0027] Preferably, the cross-sections of the bottom plate 701 and the fixing plate 706 are both "T"-shaped.

[0028] 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 moving trolley 1 through a shaft, and one end of the side wall of the moving trolley 1 has a support plate 102 for limiting the limit baffle 101; It is convenient to quickly fix the moving frame 7 and the moving trolley 1 to form a whole.

[0029] Preferably, a fixing block 20 is fixed on the bracket 2, and a pressing screw 21 for limiting the shaking of the gas storage tank 6 is connected to the side wall of the fixing block 20 through a threaded portion; 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 vehicle 1.

[0030] Preferably, the lower surface of the moving trolley 1 is provided with a first moving wheel 9; The mobile trolley 1 can be conveniently moved to fumigate different grain depots.

[0031] 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 with 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, 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 gases after final measurement are simultaneously gathered to the inner side of the static mixer A14 for the first mixing. The gas detector 17 is used to detect whether the concentration of the mixed phosphine 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, Then, until the gas detector 17 detects that the concentration of the mixed gas flowing in is low, the three-way valve C181 introduces the low-concentration mixed gas into the inner side 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 inner side 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 inner side of the static mixer B19 through the three-way valve C181, and after being evenly mixed 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 to draw the bottom plate 701 out from the inner side of the connecting slide 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.

[0032] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present 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 mobile trolley (1), wherein a bracket (2) is fixed on the mobile trolley (1); A mixing box (3) is arranged inside the bracket (2), and a control box (4) is arranged on the front surface of the mixing box (3); The inner side of the mixing box (3) comprises 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. 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 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. The output end of the static mixer A (14) is connected to the second mixing component.

2. The grain fumigation device based on phosphine mixed nitrogen 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 mixed nitrogen gas according to claim 1, characterized in that: The length of the second shunt pipe (162) is greater than the length of the first shunt pipe (161).

4. The grain fumigation device based on phosphine mixed nitrogen gas according to claim 1, characterized in that: The second mixing assembly comprises a gas detector (17), a three-way valve C (181), a gas storage box (182), a connecting pipe (183) and a static mixer B (19); 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 gas storage box (182) is connected to the other output end of the three-way valve C (181); the lower surface of the gas storage box (182) has a connecting pipe (183) connected to the inside of the static mixer B (19); a solenoid valve is arranged on the connecting pipe (183); 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 connecting to a grain depot fumigation system.

5. The grain fumigation device based on phosphine mixed nitrogen gas according to claim 1, characterized in that: A moving frame (7) is slidably connected to the inner side of the moving trolley (1); a gas storage tank (6) for storing phosphine or nitrogen is arranged on the moving frame (7); and a connecting pipe (5) connected to a mixing box (3) is arranged at the output end of the gas storage tank (6); and a baffle assembly (10) for limiting the moving frame (7) from sliding out from the inner side of the moving trolley (1) is arranged on the side wall of the moving trolley (1).

6. A grain fumigation device based on phosphine mixed nitrogen gas according to claim 5, characterized in that: The movable frame (7) comprises a bottom plate (701), a second movable wheel (702), a protective frame (703), an adjusting slide groove (705), a fixing plate (706) and an adjusting bolt (707); the bottom plate (701) is slidably mounted on the inner side of a connecting slide groove (704) provided on the inner side of the movable trolley (1); a fixing plate (706) is fixed on the bottom plate (701); the protective frame (703) is slidably connected to the fixing plate (706) via an adjusting slide groove (705) provided on the side wall; an adjusting bolt (707) matching the adjusting slide groove (705) is connected to the inner side of the fixing plate (706) via a threaded portion; and the bottom surface of the bottom plate (701) has a second movable wheel (702).

7. A grain fumigation device based on phosphine mixed nitrogen gas according to claim 6, characterized in that: The cross-sections of the bottom plate (701) and the fixing plate (706) are both "T"-shaped.

8. The grain fumigation device based on phosphine mixed nitrogen gas according to claim 5, characterized in that: The baffle assembly (10) comprises a limit baffle (101) and a support plate (102); the limit 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 limit baffle (101).

9. The grain fumigation device based on phosphine mixed nitrogen gas according to claim 5, characterized in that: A fixing block (20) is fixed on the bracket (2), and a side wall of the fixing block (20) is connected to a pressing screw (21) through a threaded portion for limiting the shaking of the gas storage tank (6).

10. 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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