JP2013202466A - Automatic liquid agent mixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic liquid agent mixing device having good maintainability.SOLUTION: An automatic liquid agent mixing device 1 includes a liquid agent tank 10, liquid agent supply flow passages 3, liquid agent force-feeding means 4, suction flow passage changeover means 5, and a control part 6. The control part 6 controls the suction flow passage changeover means 5 interlockingly with piston drive parts 40 such that a first suction flow passage 31 is opened and a second suction flow passage 32 is closed when a first syringe 4A performs a suction step, and that the second flow passage 32 is opened and the first suction flow passage 31 is closed when a second syringe 4B performs the suction step.

Description

  The present invention relates to a liquid automatic mixing apparatus for automatically mixing water and liquid.

  2. Description of the Related Art Conventionally, there has been known a liquid agent spraying device that stores a liquid agent diluted in advance with water to a predetermined concentration in a tank, and sprays the liquid agent sucked from the tank by a spraying pump to a spray nozzle. In order to perform an efficient spraying operation in such a liquid agent spraying device, a large tank capacity is required, and when the tank capacity becomes large, processing of excess liquid agent and tank cleaning water becomes a problem. In order to solve this problem, a water tank and a liquid agent tank are provided separately, and the liquid agent supply flow path from the liquid agent tank is joined to the flow path from the water tank to the spray nozzle, so that the amount of liquid agent required for spray water only In recent years, liquid agent mixing and spraying apparatuses for mixing and spraying are widely used.

  In such a liquid agent mixing and spraying apparatus, a liquid agent mixing apparatus using a liquid agent supply pump such as a tube pump type or a diaphragm pump type is used. Further, in Patent Document 1 below, a liquid agent mixing apparatus using a plurality of cylinder / piston pumps is used.

  The prior art described in Patent Document 1 is a liquid agent injection / mixing device that injects a liquid agent filled in a liquid agent container into a fresh water line pressurized by a spray pump, and mixes / diluts it to a predetermined concentration. Move pistons in multiple cylinders in the same direction, provide suction and discharge ports at both ends of one cylinder, connect a fresh water tank to one side of the piston moving in one cylinder, and connect the other side of the piston To which a liquid tank for chemicals is connected. According to this, the movement of the piston is assisted by using the spraying pressure of fresh water, the liquid agent on the other side of the piston is discharged in the stroke of sucking fresh water into one side of the piston in one cylinder, and the other side of this piston is discharged. The fresh water on one side of the piston is returned to the fresh water tank in the process of sucking the liquid.

Japanese Patent Laid-Open No. 9-297821

  According to the above-described prior art, there is a process of inhaling fresh water in a process of one cylinder and a process of inhaling a liquid agent such as a chemical solution, so that fresh water is inhaled into a cylinder contaminated by a liquid agent such as a chemical solution. Thus, a small amount of liquid such as a chemical is mixed with the fresh water sucked into the cylinder. Then, since the fresh water in the cylinder is returned to the fresh water tank in the next stroke, the fresh water tongue is contaminated by the fresh water mixed with a liquid agent such as a chemical solution. Further, since fresh water in which a liquid agent such as a chemical solution is slightly mixed flows also in a piping system connecting the cylinder and the fresh water tank, this piping system is also contaminated by the liquid agent.

  As a result, it is necessary to clean the fresh water tank and the piping system connecting the fresh water tank and the cylinder during the maintenance of the prior art apparatus, which requires a lot of labor for maintenance and is contaminated with a liquid agent such as a chemical solution. Treatment of cleaning water during maintenance becomes a problem.

  This invention makes it an example of a subject to cope with such a problem. That is, it is possible to improve the maintainability by clearly separating the liquid supply channel from the clean water pumping flow path, to solve the cleaning water treatment problem contaminated with the liquid generated during maintenance, It is an object of the present invention that it is possible to realize a highly accurate dilution concentration of the liquid agent in combination with the flow rate detection, that it can be easily incorporated into an existing power spraying device and perform highly accurate liquid agent mixing.

  In order to achieve such an object, an automatic liquid medicine mixing apparatus according to the present invention comprises at least the following configuration.

  A liquid agent automatic mixing device that mixes a liquid agent into a fresh water pumping passage through which fresh water is pumped, a liquid agent tank that stores the liquid agent, and a liquid agent supply passage that supplies the liquid agent in the liquid agent tank to the fresh water pumping passage. The first syringe and the second syringe that are arranged in parallel and connected to the liquid supply channel at one end in the same direction, and the second piston of the first syringe and the second syringe of the second syringe A liquid drive unit that includes a piston drive unit that moves the pistons in directions opposite to each other, sucks the liquid in the liquid tank through the liquid supply channel, and pumps the liquid into the fresh water pump; and the liquid supply flow A first suction channel that communicates the liquid agent tank and the first syringe and a second suction channel that communicates the liquid agent tank and the second syringe, and the other is closed when one is open. Cut to A suction flow path switching means, and a control section for controlling the piston drive section and the suction flow path switching means. The control section opens the first suction flow path when the first syringe is in the suction stroke. The liquid suction automatic mixing device is characterized in that the second suction flow path is closed and the second suction flow path is opened and the first suction flow path is closed during the suction stroke of the second syringe.

The liquid drug automatic mixing apparatus of the present invention having such characteristics can obtain the following effects by having the above-described characteristics.
The liquid supply channel can be clearly separated from the clean water pumping channel, and maintenance can be improved. Moreover, the problem of the cleaning water process at the time of a maintenance can be eliminated by not mixing a liquid agent in the tank of fresh water. A highly accurate dilution concentration of the liquid agent can be realized in combination with the flow rate detection of the fresh water flow path. It can be easily incorporated into existing power spreaders.

It is explanatory drawing which showed the liquid agent automatic mixing apparatus which concerns on one Embodiment of this invention, and the liquid agent mixing spraying apparatus to which this liquid agent automatic mixing apparatus was applied. In the liquid agent automatic mixing device concerning one embodiment of the present invention, it is an explanatory view showing concrete composition of a part of piston drive part.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing a liquid agent automatic mixing device according to an embodiment of the present invention and a liquid agent mixing and spraying device to which the liquid agent automatic mixing device is applied. Here, the liquid preparation includes liquid chemicals such as agricultural chemicals, liquid fertilizers, and the like.

  The liquid agent automatic mixing apparatus 1 is an apparatus for supplying an appropriate amount of liquid agent to the fresh water pressure-feeding passage 21 of the liquid agent mixing and spraying apparatus 2. The liquid agent automatic mixing apparatus 1 includes a liquid agent tank 10, a liquid agent supply channel 3, a liquid agent pressure feeding unit 4, a suction channel switching unit 5, and a control unit 6.

  The liquid agent tank 10 is a container for storing a liquid agent such as a chemical solution, and a relatively small capacity container can be used. A commercially available chemical solution container can be used as the liquid agent tank 10 as it is. The liquid agent supply channel 3 is a channel for supplying the liquid agent in the liquid agent tank 10 to the fresh water pumping channel 21.

  The liquid pressure feeding means 4 includes a piston drive unit 40, a first syringe 4A, and a second syringe 4B. The first syringe 4A and the second syringe 4B are arranged in parallel, and each is connected to the liquid supply channel 3 at one end in the same direction. A first piston 4A1 is provided in the first syringe 4A, and a second piston 4B1 is provided in the second syringe 4B.

  The piston drive unit 40 moves the first piston 4A1 and the second piston 4B1 in opposite directions. Specifically, the piston drive unit 40 includes a first piston rod 41 having one end connected to the first piston 4A1, a second piston rod 42 having one end connected to the second piston 4B1, a first gear 43, The second gear 44, the drive gear 45, and the drive motor 46 are provided.

  FIG. 2 is an explanatory diagram specifically showing a part of the configuration of the piston drive unit 40. The first piston rod 41 (or the second piston rod 42) having one end connected to the first piston 4A1 (or the second piston 4B1) in the first syringe 4A (or the second syringe 4B) A screw portion 41a such as a trapezoidal screw is formed. The first gear 43 (or the second gear 44) pivotally supported on the first syringe 4A (or the second syringe 4B) is attached to the screw portion 41a of the first piston rod 41 (or the second piston rod 42). A first piston which has an internal thread portion 43a to be screwed and is slidably supported on a support member 41e by thrust bearings 41b and 41c when the first gear 43 (or the second gear 44) is rotationally driven. The rod 41 (or the second piston rod 42) slides in the axial direction indicated by the arrow.

  The first gear 43 (or the second gear 44) meshes with the drive gear 45. When the drive motor 46 rotates, the drive gear 45 rotates and the first gear 43 (engaged with the drive gear 45). Alternatively, the second gear 44) is driven to rotate, and the first piston rod 41 (or the second piston rod 42) slides in the axial direction as described above. The first piston 4A1 (or second piston 4B1) is connected to one end of the first piston rod 41 (or second piston rod 42) via a bearing 41d, and the first piston rod 41 (or second piston rod 41). 42), the first piston 4A1 (or the second piston 4B1) moves in the first syringe 4A (or the second syringe 4B).

  At this time, the first gear 43 pivotally supported on the first syringe 4 </ b> A and the second gear 44 pivotally supported on the second syringe 4 </ b> B are engaged with each other, so that the drive gear 45 is rotated in one direction. Thus, the first gear 43 and the second gear 44 rotate in opposite directions. As a result, the first piston 4A1 and the second piston 4B1 move in opposite directions.

  The liquid supply channel 3 includes a first suction channel 31 that communicates the liquid agent tank 10 and the first syringe 4A, and a second suction channel 32 that communicates the liquid agent tank 10 and the second syringe 4B. . The liquid supply channel 3 includes a first pressure feed channel 33 branched from the first suction channel 31, a second pressure feed channel 34 branched from the second suction channel 32, and a first pressure feed channel 33. A merging channel 30 that joins the second pressure feeding channel 34 and connects to the fresh water feeding channel 21 is provided. In the example shown in the figure, check valves 33A and 34A are provided in the first pressure-feed passage 33 and the second pressure-feed passage 34, respectively. Instead of the check valves 33A and 34A, a single check valve may be provided in the merging flow path 30.

  The suction channel switching means 5 includes a first suction channel 31 that communicates the liquid agent tank 10 and the first syringe 4A, and a second suction channel 32 that communicates the liquid agent tank 10 and the second syringe 4B. When one is open, the other is switched to close. Specifically, the suction flow path switching means 5 includes a first on-off valve 51 provided in the first suction flow path 31, a second on-off valve 52 provided in the second suction flow path 32, and a drive motor 50 for driving them. In addition, a switching mechanism 53 that transmits the power of the drive motor 50 to the first on-off valve 51 and the second on-off valve 52 is provided.

  Next, functions of the control unit 6 will be described. One function of the control unit 6 is to continuously move the first piston 4A1 and the second piston 4B1 in the piston drive unit 40. In order to perform this, one or both of the moving ends of the first piston 4A1 and the second piston 4B1, or one or both of the moving ends of the first piston rod 41 or the second piston rod 42 are provided with the first piston 4A1. Alternatively, detection means 61A and 61B for detecting the stroke end of the second piston 4B1 are provided. When the detection means 61A, 61B detects the stroke end of the first piston 4A1 or the second piston 4B1, the control unit 6 drives the drive motor 46 in the reverse direction to move the first piston 4A1 and the second piston 4B1. The direction is reversed and the first piston 4A1 and the second piston 4B1 are continuously moved.

  Another function of the control unit 6 is to control the operation of the piston driving unit 40 and the suction flow path switching means 5 in an interlocked manner. The first syringe 4A opens the first suction flow path 31 during the suction stroke and performs the first operation. 2 The suction channel 32 is closed, and the second syringe 4B opens the second suction channel 32 and closes the first suction channel 31 during the suction stroke. Specifically, the control unit 6 recognizes the end of the suction stroke of the first syringe 4A by the detection output of the detection means 61A, and detects the end of the suction stroke of the second syringe 4B from the detection output of the detection means 61B. Recognize by. Since the end of the suction stroke of the second syringe 4B is the start of the suction stroke of the first syringe 4A, the drive motor 50 is driven based on the detection output of the detection means 61B, and the first on-off valve 51 is driven. Is opened to close the second on-off valve 52, and the end of the suction stroke of the first syringe 4A is the start of the suction stroke of the second syringe 4B. The motor 50 is driven to open the second on-off valve 52 and close the first on-off valve 51.

  The other function of the control unit 6 is to control the supply amount of the liquid agent supplied to the fresh water pumping flow path 21. For this purpose, the control unit 6 controls the piston moving speed of the piston drive unit 40 based on the detection output of the pumping state detection means 22 provided in the fresh water pumping flow channel 21. The piston moving speed is controlled by the rotational speed of the drive motor 46. In order to increase the supply amount of the liquid agent, the rotation speed of the drive motor 46 is increased to increase the piston moving speed, and in order to decrease the supply amount of the liquid agent, the rotation speed of the drive motor 46 is decreased to decrease the piston movement speed. The pumping state detection means 22 can be constituted by a flow sensor or a pressure sensor. The controller 6 recognizes the flow rate of fresh water flowing through the fresh water pumping flow path 21 based on the output of the pumping state detection means 22 and obtains the liquid supply amount for obtaining the set dilution concentration. Then, the piston moving speed is controlled so as to correspond to the obtained liquid supply amount.

  The liquid agent mixing and spraying device 2 has a configuration of a known power spraying device except for the liquid agent automatic mixing device 1, and includes a fresh water tank 20, a spraying pump 23, a pressure adjusting valve 24, a spraying nozzle 25, and the like. ing. In the fresh water pumping flow path 21 through which fresh water is pumped by the pressure of the spraying pump 23, the pumping state detecting means 22 is provided as described above, and a check valve 26 is provided upstream thereof as necessary.

  The merging channel 30 of the liquid agent automatic mixing apparatus 1 is connected to the downstream side of the pumping state detection means 22 in the fresh water pumping channel 21. It is preferable that the connection point 21A of the merging channel 30 and the installation position of the pressure-feed state detection means 22 are close to each other. By bringing the connection point 21A close to the installation position of the pressure-feed state detection means 22, the detection output of the pressure-feed state detection means 22 is close to the value at the connection point 21A, and a dilution concentration set with higher accuracy can be realized. It becomes possible.

  Operation | movement of the liquid agent automatic mixing apparatus 1 based on the function of the control part 6 mentioned above is demonstrated. The controller 6 raises the first piston 4A1 in the first syringe 4A and lowers the second piston 4B1 in the second syringe 4B in one stroke, and executes the suction stroke in the first syringe 4A. In the second syringe 4B, a pressure feeding stroke is executed. At that time, the first opening / closing valve 51 is opened and the second opening / closing valve 52 is closed by the suction channel switching means 5, so that the liquid supply channel 3 is connected via the first suction channel 31. The liquid agent is sucked from the liquid tank 10 into the first syringe 4A, and the liquid agent sucked in the second syringe 4B in the previous step is sent to the merging flow path 30 via the second pressure feed flow path 34, and is supplied with fresh water pressure. The liquid agent is mixed into the passage 21.

  Thereafter, when the first piston 4A1 reaches the stroke end, the rotation of the drive motor 46 is reversed, the second piston 4B1 in the second syringe 4B is raised, and the first piston 4A1 in the first syringe 4A is lowered. In the second syringe 4B, an intake stroke is executed, and in the first syringe 4A, a pressure feed stroke is executed. At that time, the second opening / closing valve 52 is opened and the first opening / closing valve 51 is closed by the suction channel switching means 5, so that the liquid supply channel 3 is connected via the second suction channel 32. The liquid agent is sucked into the second syringe 4B from the liquid agent tank 10, and the liquid agent sucked in the first process into the first syringe 4A is sent to the merging flow path 30 via the first pressure feed flow path 33, and is supplied with fresh water pressure. The liquid agent is mixed into the passage 21. By repeating such a process, the liquid agent can be continuously supplied to the fresh water pumping flow path 21.

  Moreover, the control part 6 controls the moving speed of 1st piston 4 A1 and 2nd piston 4 B1 based on the detection output of the pumping state detection means 22 in the fresh water pumping flow path 21, and it is set as the flow volume in the fresh water pumping flow path 21. On the other hand, the supply amount of the liquid agent is controlled so as to obtain a dilution concentration set for the liquid agent. Thereby, even when the spraying flow rate is changed, it is possible to always obtain the set dilution concentration of the liquid agent.

  The characteristics of the liquid drug automatic mixing apparatus 1 described above are listed as follows.

  The liquid agent automatic mixing apparatus 1 can perform highly accurate liquid agent mixing and spraying only by connecting the merging channel 30 to the fresh water pumping channel 21. Thereby, it becomes possible to perform liquid mixture mixing with high precision by retrofitting an existing power spreader.

  Since the liquid agent automatic mixing device 1 can easily define the supply amount of the liquid agent by the moving speed of the first piston 4A1 and the second piston 4B1, the liquid agent supply amount with high accuracy without providing a flow rate sensor in the liquid agent supply channel 3 Can be controlled.

  Since the automatic liquid mixing device 1 can connect the merge flow path 30 to an arbitrary position in the fresh water pressure flow path 21, the vicinity of the pressure feed state detection means (flow rate sensor or pressure sensor) 22 in the fresh water pressure flow path 21. By connecting the merging flow path 30 to the liquid supply amount, it is possible to control the supply amount of the liquid agent with a value close to the measured value of the pumping flow rate of fresh water at the connection point 21A, and to obtain a highly accurate dilution concentration.

  When the liquid agent automatic mixing apparatus 1 is used, the liquid agent flow path is limited to the liquid agent supply flow path 3, so that the upstream side of the connection point 21A in the liquid agent mixing and spraying apparatus 2 is not contaminated by the liquid agent. This facilitates maintenance of the fresh water tank 20 and the fresh water pumping passage 21. Moreover, the cleaning water contaminated with the liquid agent can be reduced as much as possible during maintenance.

  Since the piston drive part 40 of the liquid agent automatic mixing apparatus 1 converts the rotational motions of the first gear 43 and the second gear 44 into linear motions by the screw portions 41a of the first piston rod 41 and the second piston rod 42, high deceleration is achieved. A ratio can be obtained. Thereby, the precision of the liquid supply amount is improved by high-precision speed control. In addition, when two or more syringes are connected, the number of syringes can be easily increased only by connecting the gears to the first gear 43 and the second gear 44, so various liquid agents can be mixed easily. It becomes possible.

1: Liquid agent automatic mixing device, 10: Liquid agent tank,
2: Liquid agent mixing and spraying device, 20: Fresh water tank,
21: fresh water pumping passage, 21A: connection point 22: pumping state detection means, 23: spraying pump,
24: pressure regulating valve, 25: spray nozzle, 26: check valve,
3: Liquid supply channel, 30: Merge channel,
31: 1st suction flow path, 32: 2nd suction flow path,
33: 1st pumping flow path, 34: 2nd pumping flow path,
33A, 34A: check valve,
4: Liquid pressure feeding means,
4A: first syringe, 4A1: first piston,
4B: second syringe, 4B1: second piston,
40: Piston drive part, 41: 1st piston rod, 41a: Screw part,
41b, 41c: thrust bearing, 41d: bearing,
42: second piston rod, 43: first gear, 43a: internal thread,
44: second gear, 45: drive gear, 46: drive motor,
5: suction flow path switching means, 50: drive motor,
51: 1st on-off valve, 52: 2nd on-off valve, 53: Switching mechanism,
6: control unit, 61A, 61B: detection means

Claims (4)

A liquid automatic mixing device for mixing liquid into a fresh water pumping flow path through which fresh water is pumped,
A liquid tank for storing the liquid,
A liquid agent supply passage for supplying the liquid agent in the liquid agent tank to the fresh water pressure-feed passage,
A first syringe and a second syringe arranged in parallel and connected to the liquid supply channel at one end in the same direction, and a first piston of the first syringe and a second piston of the second syringe A liquid drive unit that includes a piston drive unit that moves the liquid agent in opposite directions, sucks the liquid in the liquid tank via the liquid supply channel, and pumps the liquid into the fresh water pump.
One of the first suction channel that communicates the liquid agent tank and the first syringe and the second suction channel that communicates the liquid agent tank and the second syringe are opened in the liquid agent supply channel. A suction flow path switching means that sometimes switches the other to close;
A control unit for controlling the piston drive unit and the suction flow path switching unit;
The control unit opens the first suction channel and closes the second suction channel when the first syringe is in the suction stroke, and closes the second suction channel when the second syringe is in the suction stroke. An automatic liquid medicine mixing device which is opened and the first suction flow path is closed. The liquid supply channel is
The first pressure-feeding channel branched from the first suction channel, the second pressure-feeding channel branched from the second suction channel, the first pressure-feeding channel, and the second pressure-feeding channel are joined together to It has a confluence channel that connects to the fresh water pumping channel,
The liquid agent automatic mixing device according to claim 1, wherein a check valve is provided in the first pressure-feeding channel, the second pressure-feeding channel, or the merging channel.   3. The liquid agent automatic mixing according to claim 1, wherein the control unit controls a piston moving speed of the piston drive unit based on a detection output of a pumping state detection unit provided in the fresh water pumping flow path. apparatus. The piston drive unit is
A first piston rod having one end connected to the first piston;
A second piston rod having one end connected to the second piston;
A first gear that includes an internal thread portion that is screwed into a thread portion that is formed around the first piston rod, and is pivotally supported on the first syringe;
A second gear that includes an inner threaded portion that engages with a threaded portion that is formed around the second piston rod, and that is pivotally supported on the second syringe and meshes with the first gear;
A drive gear meshing with one of the first gear and the second gear;
A drive motor for driving the drive gear,
The said control part detects the stroke end of the said 1st piston or the said 2nd piston, and reversely drives the said drive motor, The liquid agent automatic mixing apparatus described in any one of Claims 1-3 characterized by the above-mentioned.

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