CN209949862U - Fertilizer injection device and fertilizer injection system - Google Patents

Abstract

The utility model discloses a fertilizer injection device and a fertilizer injection system, which relate to the technical field of fertilizer application equipment. . The main technical scheme of the utility model is as follows: the fertilizer injection device includes a sub-packing part, a mixed flow part and a linkage part; the sub-packaging part includes a plurality of boxes and the same number of lower liquid pipes as the box bodies, and each lower liquid pipe is provided with a valve respectively , the valve stem of each valve extends in the same direction; the mixed flow box is arranged on the other end of the lower liquid pipe; the linkage part includes a central shaft, a driving part and a plurality of linkage parts, one end of the driving part is connected to the central shaft, and the other end is used for To detect the liquid level of the mixed flow box, one end of each linkage is connected to the central shaft, and the other end is connected to the valve stem of the valve to control the opening or closing of the valve. The fertilizer injection system includes multiple groups of fertilizer injection devices to meet the needs of a single system for fertilizing multiple areas.

Description

Fertilizer injection device and fertilizer injection system

technical field

The utility model relates to the technical field of fertilization equipment, in particular to a fertilizer injection device and a fertilizer injection system.

Background technique

Micro-irrigation technology has been widely applied in arid regions of northern my country due to its advantages of water saving, fertilizer saving, and increasing yield and efficiency. The biggest advantage of the micro-irrigation system is that it can supply fertilizer in a timely and appropriate amount according to the growth period of crops. There are many kinds of fertilization equipment supporting the micro-irrigation system, such as differential pressure fertilization tank, Venturi fertilizer, proportional fertilization pump, automatic fertilization machine, etc. These fertilization devices are generally used in large-area systems, and some fertilize Equipment requirements are high, and there is no special fertilization for irrigation systems with small areas, many partitions, and different fertilization rates. When the area is small and large, the equipment investment of proportional fertilizer injection pump and automatic fertilizer applicator is very high, and pressure difference fertilizer tank and Venturi fertilizer applicator are often used. However, there are still complex operations, difficulty in controlling the amount of fertilizer application, and high pressure requirements for the micro-irrigation system. question.

The main fertilization principle of the Venturi fertilization method is that the Venturi fertilizer applicator is installed in parallel with the control ball valve of the water supply pipe at the entrance of the micro-irrigation system or the irrigation area. The water flows through the branch pipe where the Venturi fertilizer applicator is installed, and the vacuum suction generated by the water flow through the Venturi pipe will evenly suck the fertilizer solution from the open fertilizer bucket into the pipeline system for fertilization.

The main disadvantage of the Venturi fertilization method is that the pressure loss is large (the pressure loss can reach 2.0-2.5 kg), which greatly affects the pressure and flow of the irrigation water. At the same time, the fertilizer absorption is uneven, and the fertilizer absorption effect is unstable, which cannot realize automatic quantitative fertilization. .

Utility model content

In view of this, the embodiment of the present invention provides a fertilizer injection device and a fertilizer injection system, the main purpose of which is to automatically and quantitatively apply fertilizer, and a single device can meet the fertilizer application requirements of small areas, many partitions, and different fertilizer amounts.

To achieve the above object, the utility model mainly provides the following technical solutions:

On the one hand, an embodiment of the present utility model provides a fertilizer injection device, including:

a sub-packaging part, the sub-packaging part includes a number of boxes and the same number of lower liquid pipes as the box bodies, each of the box bodies is respectively connected to one end of one of the lower liquid pipes, and each of the lower liquid pipes The pipes are respectively provided with valves, and the valve stems of each of the valves extend in the same direction;

Mixed-flow part, the mixed-flow part includes a mixed-flow box, the mixed-flow box is arranged at the other end of the lower liquid pipe, and is used to receive the material flowing out of each of the boxes, and the mixed-flow box is provided with a liquid level upper limit and a liquid bit lower limit;

A linkage part, the linkage part includes a central shaft, a driving member and a plurality of linkage members, the central shaft is mounted on the mixed flow box through a bearing, one end of the driving member is connected to the central shaft, and the other end is used for To detect the liquid level of the mixed flow box, one end of each of the linkages is connected to the central shaft, and the other end is connected to the valve stem of the valve for controlling the opening or closing of the valve.

The purpose of the present utility model and the solution to its technical problems can be further achieved by adopting the following technical measures.

Optionally, in the aforementioned fertilizer injection device, wherein each of the linkages is an external meshing sheave mechanism, including a sheave and a dial, and each of the sheaves is respectively fixedly connected to the valve stem of one of the valves. On the upper side, the dial is fixedly connected to the central shaft.

Optionally, the aforementioned fertilizer injection device, wherein each of the linkages is a double rocker mechanism, and the free ends of the two rockers of each of the double rocker mechanisms are respectively fixed on the central shaft and one of the free ends. on the valve stem.

Optionally, in the aforementioned fertilizer injection device, wherein each of the linkages includes a first gear and a second gear that mesh with each other, each of the first gears is fixedly connected to the central shaft, and each of the first gears. The two gears are respectively fixedly connected to the valve stem of one of the valves.

Optionally, the aforementioned fertilizer injection device, wherein the driving member includes a hydraulic member, a rocker, a disc, a liquid level sensor and a controller, the center of the disc and the central shaft are fixedly connected, and the hydraulic member is A reciprocating piston rod is provided, one end of the rocker is rotatably connected with the free end of the piston rod, and the other end is rotatably connected with the edge of the disc; the liquid level sensor is installed in the mixed flow box, It is used to detect the liquid level of the mixed flow tank; one end of the controller is connected to the liquid level sensor for receiving the signal value output by the liquid level sensor, and the other end is connected to the hydraulic component for controlling The piston rod of the hydraulic member reciprocates.

Optionally, the aforementioned fertilizer injection device, wherein the driving member comprises a sliding rod, a rack and a floating ball, the sliding rod is slidably connected to the mixed flow box, and the rack is arranged at one end of the sliding rod, And meshing with one of the first gears, the floating ball is arranged at the other end of the sliding rod, and is in contact with the liquid in the mixed flow box, so as to make the sliding rod move toward or away from the floating ball. direction of the ball.

Optionally, the aforementioned fertilizer injection device, wherein the mixed flow box is fixed with a support, the sliding rod is sleeved with a spring, one end of the spring is fixedly connected to the sliding rod, and the other end is fixedly connected to the support , which is used to increase the power of the slide bar to slide down.

Optionally, in the aforementioned fertilizer injection device, a stirring shaft is respectively provided in each of the box body and the mixed flow box, for stirring the liquid in each of the box body and the mixed flow box.

Optionally, in the aforementioned fertilizer injection device, wherein: the valve is a ball valve or a butterfly valve.

On the other hand, the utility model embodiment also provides a fertilizer injection system, the system includes:

Any of the aforementioned fertilizer injection devices, the fertilizer injection devices are several groups, wherein the lower end of each of the mixed flow boxes is provided with a fertilizer suction port, and the fertilizer suction port is sequentially connected with a fertilizer suction pipe, a fertilizer injection pump and a fertilizer injection. Tube;

PLC console, the PLC console includes a power supply, several DC speed regulators and several power switches; the power supply provides power for each of the driving parts and each of the fertilizer injection pumps, and the DC regulator The speed controller is used to adjust the output power of the corresponding fertilizer injection pump, and the power switch is used to control the start and stop of the fertilizer injection pump.

With the above technical solutions, an image acquisition device, a modular camera and a monitoring system of the present utility model have at least the following advantages:

The outflow of each component solution in the box is linked with the liquid level of the mixed flow box. During the fertilization process, the mixed solution in the mixed flow box can be automatically prepared, and the mixed box always maintains a solution. The fertilizer injection pump will not be short of liquid, and the fertilizer solution in the mixing box is ready to be applied, so the solution in the mixed flow box does not need to be prepared a lot at one time, which avoids the stratification of the solution in the mixed flow box. The effective components have different concentrations up and down in the mixed flow box, which ensures the controllability of the fertilization concentration of the fertilizer injection pump. Moreover, the opening of each of the valves is synchronized to ensure that the proportion of each component solution received by a single mixed-flow box per unit time remains stable. Finally, a single group of fertilizer injection devices can automatically and quantitatively fertilize, and multiple groups of fertilizer injection devices can respectively prepare fertilizer solutions with different component concentrations or different components to meet the fertilization needs of different plots at the same time.

Description of drawings

Fig. 1 is the left side sectional view of a kind of fertilizer injection device that the utility model embodiment provides;

2 is a rear view of a fertilizer injection device provided by an embodiment of the present invention;

Fig. 3 is the structural representation of the first linkage member at A-A in Fig. 2;

Fig. 4 is the structural representation of the second type of linkage at A-A in Fig. 2;

Fig. 5 is the structural representation of the third linkage at A-A in Fig. 2;

Fig. 6 is the structural representation of the third linkage at A-A in Fig. 2;

7 is a left side view of another fertilizer injection device provided by an embodiment of the present utility model;

FIG. 8 is a three-dimensional isometric view of a fertilizer injection system provided by an embodiment of the present invention.

Detailed ways

Reference numerals in the drawings include: box 1, lower liquid pipe 101, valve 2, valve stem 201, mixed flow box 3, central shaft 4, first gear 105, second gear 106, dial 205, sheave 206, rocker 305, driving gear 405, driven gear 406, slide bar 107, rack 108, float 109, spring 110, progressive rocker 7, disc 8, liquid level sensor 9, hydraulic cylinder 10, piston Rod 11 , fertilizer suction pipe 12 , fertilizer injection pump 13 , fertilizer injection pipe 14 , DC governor 15 , power supply 16 , fertilizer injection platform 17 , power switch 18 , field level gauge 19 , and stirring device 20 .

In order to further illustrate the technical means and effects adopted by the present utility model to achieve the intended purpose of the utility model, the following in conjunction with the accompanying drawings and preferred embodiments, the specific embodiments, structures, features and effects of the application according to the present utility model are described in detail. The description is as follows. In the following description, different "an embodiment" or "embodiments" do not necessarily refer to the same embodiment. Furthermore, the particular features, structures, or characteristics in one or more embodiments may be combined in any suitable form.

Example 1

As shown in FIG. 1 , FIG. 2 and FIG. 3 , the fertilizer injection device provided in this embodiment includes: a sub-assembly part, a mixed flow part and a linkage part, and the sub-assembly part includes three to four box bodies 1 and a combination of the box bodies 1 . The same number of lower liquid pipes 101, each tank 1 can be respectively filled with different types of fertilizers (one of nitrogen, phosphorus, potassium or trace elements and other components), and each tank 1 is respectively connected to one of the lower liquids. At one end of the pipe 101, each lower liquid pipe 101 is provided with a valve 2 respectively, and the valve stem 201 of each valve 2 extends in the same direction; It is used to receive the materials flowing out of each box 1. The mixed flow box 3 is provided with an upper limit and a lower limit of the liquid level; the linkage part includes a central shaft 4, a driving part and a plurality of linkage parts, and the central shaft 4 is installed in the mixed flow box through a bearing. 3, one end of the driving member is connected to the central shaft 4, the other end is used to detect the liquid level of the mixed flow tank 3, one end of each linkage is connected to the central shaft 4, and the other end is connected to the valve stem 201 of the valve 2, Used to control the opening or closing of valve 2.

When the liquid level of the mixed flow tank 3 reaches the lower limit of the liquid level, the driving element drives the central shaft 4 to rotate, and drives the valve stem 201 of the valve 2 to rotate, so that the valve 2 is opened, and different liquid components in different tanks 1 flow to the mixed flow synchronously. in box 3.

When the liquid level of the mixed flow tank 3 reaches the upper limit of the liquid level, the driving element reversely drives the central shaft 4 to rotate, and drives the valve stem 201 of the valve 2 to reversely rotate, so that the valve 2 is closed, and the liquid components in the tank 1 no longer exist. flow to the mixed flow box 3.

The above-mentioned technical solution adopted by the present utility model, in order to solve the problem that the existing device cannot fertilize quantitatively, and a single device cannot meet the fertilization needs of the plots with small area, many partitions, and different fertilization amounts; therefore, the present utility model adopts three to four Each box 1 is divided into different fertilizer solutions, the boxes 1 can be installed above the mixed flow box 3, and the solution in each box 1 can flow down to the mixed flow box 3 due to gravity; It is set at the same height as the mixed flow box 3 , and the two are connected through a pump and a pipeline, and the solutions of different components in each box 1 are transported to the mixed flow box 3 .

When the liquid level of the mixed flow tank 3 reaches the lower limit of the liquid level, the driving member drives the central shaft 4 to rotate, the central shaft 4 drives the linkage member to rotate, and each linkage member drives the valve stem 201 of one of the valves 2 to rotate, thereby driving the valve core to rotate, thereby Drive the valve 2 to open, the different liquid components flow to the mixed flow box 3 synchronously, and the liquid level of the mixed flow box 3 rises. Affected by the rising liquid level, the driving member reversely drives the central shaft 4 to rotate, thereby realizing the closing of the valve 2 . Thus, the linkage between the valve 2 switch and the liquid level change is realized, which not only maintains the stability of the liquid level of the mixed flow box 3, but also ensures the timely replenishment of the liquid materials in the mixed flow box 3. Therefore, the liquid level of the liquid material in the mixed flow box 3 does not need to be very high, to avoid the liquid material standing still for too long and stratifying, and to avoid the same fertilization area, the concentration of the applied fertilizer is different, which increases the controllability of the fertilization effect.

Compared with the prior art Venturi fertilizer applicator, the fertilizer injection device of the present embodiment can automatically open different valves 2 at the same time, and add each fertilizer component at the same time, so as to achieve the purpose of simultaneously controlling the adding speed of each fertilizer component solution, thereby achieving The purpose of controlling the proportion of solution components in the mixed flow box 3 is to carry out quantitative mixing and preparation of fertilizers.

On this basis, as shown in FIG. 1 , in order to further promote the mixing degree of the solution in the box 1 and the mixed flow box 3, a stirring device 20 can be installed in the box 1 and the mixed flow box 3 to disturb the solution in the box 1 and the mixed flow box 3. The flow effect further avoids solution stratification and further avoids solute precipitation.

On this basis, different pipe diameters can be set for different lower liquid pipes 101, or a hand valve can be set on the pipe section of the lower liquid pipe 101 above the valve 2. By controlling the opening of the hand valve, on the basis of the original structure, different tanks can be adjusted. The flow rate of the liquid components in the body 1 flowing to the mixed-flow box 3, so as to further adjust the concentration of each component in the liquid solution in the mixed-flow box 3.

In a specific implementation, the valve 2 is specifically a ball valve or a butterfly valve, or other valve 2 (a valve in which the valve stem 201 does not extend or retract relative to the housing of the valve 2, so that the linkage is arranged on the central shaft 4 and the valve stem of the valve 2). 201, the relative position of the two ends of the linkage is stable, and there will be no relative movement in the direction of the valve stem 201 of valve 2).

As shown in FIG. 3 , in a specific implementation, each linkage includes a first gear 105 and a second gear 106 that mesh with each other (both the first gear 105 and the second gear 106 are complete gears), and each first gear 105 Both are connected with the central shaft 4 with a flat key, and the valve stem 201 of each valve 2 is connected with one of the second gears 106 with a flat key respectively.

Specifically, in order to better drive the valve stem 201 of the valve 2 to rotate at the same time, the valve stem 201 of the valve 2 and the central axis 4 can be at the same level, the meshing point of the first gear 105 and the second gear 106 and the center of the two The collinearity prevents the first gear 105 and the second gear 106 from being superimposed on top of each other, and prevents the gravity of one from being exerted on the other.

On this basis, as shown in FIG. 1 , the driving member includes a sliding rod 107 , a rack 108 and a floating ball 109 . The sliding rod 107 is slidably connected to the mixing box 3 , and the rack 108 is arranged at one end of the sliding rod 107 and is connected with the sliding rod 107 . A first gear 105 is engaged, and the floating ball 109 is arranged on the other end of the sliding rod 107 and is in contact with the liquid in the mixed flow box 3 , so as to move the sliding rod 107 toward or away from the floating ball 109 .

In the solution adopted in this embodiment, when the liquid level of the mixed flow box 3 drops, the sliding rod 107 and the floating ball 109 move down together, and drive the rack 108 to move down together; the rack 108 drives the first gear 105 and the central shaft 4 meshed with it. Rotate clockwise from the perspective shown in FIG. 3; as shown in FIG. 3, each first gear 105 drives the corresponding second gear 106 to rotate counterclockwise, and each second gear 106 that rotates counterclockwise drives the corresponding valve in turn The valve stem 201 and valve core of 2 rotate, each valve 2 is opened, and the liquid groups in different boxes 1 flow to the mixed flow box 3 respectively. The liquid level of the mixed flow box 3 rises, and the rack 108 rises, driving the first gear 105 and the second The second gear 106 rotates in the opposite direction until the valve 2 closes again. After the above process, the change of the liquid level in the mixed flow box 3 is closely related to the opening and closing of the valve 2, and the liquid level in the mixed flow box 3 is basically maintained at a certain height and remains unchanged.

Further, as shown in FIG. 1 , the mixing box 3 is fixed with a bracket, the sliding rod 107 is slidably connected to the bracket, and a spring 110 is sleeved, the lower end of the spring 110 is fixedly connected to the sliding rod 107, and the upper end is fixedly connected to the bracket. . When the valve 2 is fully closed, the liquid level of the mixed flow box 3 maintained at a certain height maintains the height position of the float ball 109 and the sliding rod 107, so that the spring 110 is always in a compressed state; when the liquid level drops slightly, the spring 110 releases its elasticity The potential energy increases the power for the sliding rod 107 to slide downwards, so as to prevent the gravity of the sliding rod 107 and the rack 108 from being insufficient to drive the first gear 105 to rotate when the liquid level of the mixed flow tank 3 drops.

As shown in FIG. 4 , in a specific implementation, each linkage can be replaced with an externally meshing sheave 206 mechanism, including a sheave 206 and a dial 205, and each sheave 206 is connected to one of the valves 2 with a flat key. On the valve stem 201, each dial 205 is connected to the central shaft 4 with a flat key. The dial 205 in this embodiment can drive the sheave 206 intermittently. When the dial 205 does not turn the sheave 206, the sheave 206 does not rotate, the valve stem 201 corresponding to the valve 2 does not rotate, and the limit corresponding to the valve 2 is opened. The state has a certain duration.

As shown in FIG. 5 , in a specific implementation, each linkage can be replaced with a double rocker 305 mechanism, and the free ends of the two rockers 305 of each double rocker 305 mechanism are respectively fixed and welded to the central shaft 4 and the free ends of the two rockers 305 therein. on the stem 201 of a valve 2. Compared with the double gear meshing mechanism and the sheave 206 mechanism, the double rocker 305 mechanism continuously connects the central shaft 4 and the valve stem 201 of each valve 2, so that the rotational torque of the central shaft 4 can be transmitted to the valve of each valve 2 in time. On the rod 201, it is better to ensure the synchronization between the change of the opening degree of the valve 2 and the rotation angle of the central shaft 4.

As shown in FIG. 6 , in a specific implementation, each linkage can be replaced with an intermittent spur gear mechanism. The intermittent spur gear mechanism includes a driving gear 405 and a driven gear 406 . There is only one tooth on the driving gear 405 , and the driven gear 406 It is a complete gear and can be intermittently meshed with the driving gear 405 . Each driving gear 405 is connected to the central shaft 4 with a flat key, and each driven gear 406 is connected to the valve stem 201 of one of the valves 2 with a flat key. The driving gear 405 can drive the driven gear 406 to rotate intermittently, so that in the process of changing the opening of the valve 2, the maximum opening of the valve 2 can also remain unchanged for a certain period of time, that is, when the continuous power output is not required, it can maintain a short mixed flow The liquid level of the tank 3 rises, so that a large interval is maintained between the upper limit of the liquid level and the lower limit of the liquid level of the mixed flow tank 3 . Compared with the double gear meshing mechanism and the double rocker 305 mechanism, both the sheave 206 mechanism and the intermittent spur gear mechanism can maintain the maximum opening for a long time without requiring power output to ensure that the liquid level in the mixed flow tank 3 is high enough .

When the linkage is a double gear meshing mechanism, a sheave 206 mechanism, a double rocker 305 mechanism or an intermittent spur gear mechanism, the driving member can be replaced with the following mechanisms: As shown in Figure 7, the driving member includes hydraulic Rod 7, disc 8, liquid level sensor 9 (the liquid level sensor 9 is a guided wave radar level gauge, the model is SZRD503 liquid level) and the controller (the controller is a single-chip microcomputer, the model is STC12C5A60S2), the hydraulic parts are commonly used hydraulic Reciprocating mechanism (the reversing valve of the hydraulic part is a two-position four-way valve), the hydraulic part includes a hydraulic cylinder 10, a piston slidably connected in the hydraulic cylinder 10, a piston rod 11 fixedly connected to the piston, a hydraulic oil pipe, a hydraulic oil pump and The hydraulic oil tank, the center of the disc 8 is connected with the central shaft 4 with a flat key, the free end of the piston rod 11 passes through the hydraulic cylinder 10 and is hinged with one end of the progressive rocker 7, and the other end of the progressive rocker 7 is connected to the disc 8 The edge is hinged; the liquid level sensor 9 is installed in the mixed flow box 3 to detect the liquid level of the mixed flow box 3; the input end of the controller is electrically connected to the output end of the sensor for receiving the signal value output by the sensor, and the output of the controller The end is electrically connected to the hydraulic oil pump and the reversing valve of the hydraulic part, which is used to control the delivery of hydraulic oil in the hydraulic oil pipe and the state switching of the reversing valve, so as to control the start, stop and instantaneous direction of the reciprocating motion of the piston rod 11 of the hydraulic part, Thus, the disc 8 is driven to rotate in a reciprocating arc of less than 90 degrees, thereby driving the valve stem 201 of each valve 2 to rotate in a reciprocating arc of less than 90 degrees, thereby adjusting the switch state of the valve 2.

Because the maximum rotation range of the valve stem 201 of the ball valve or butterfly valve is a ninety-degree angle, relative to the motor coaxially connected to the central shaft 4, the central shaft 4 is directly driven, and the hydraulic mechanism drives the central shaft 4 to reciprocate. The inertia is excessively rotated to avoid the situation where the opening of valve 2 is uncontrollable.

Embodiment 2

As shown in FIG. 8 , the fertilizer injection system provided in this embodiment includes: a fertilizer injection platform 17, a PLC console fixed on the fertilizer injection platform 17, and several groups of fertilizer injection devices, and the fertilizer injection devices are any of the above-mentioned fertilizer injection devices. The fertilizer injection device, wherein the lower end of each mixed flow box 3 is provided with a fertilizer suction port, and the fertilizer suction port is sequentially connected with a fertilizer suction pipe 12, a fertilizer injection pump 13 and a fertilizer injection pipe 14, and the free end of the fertilizer injection pipe 14 is connected to the dropper system. , used for farmland fertilization; each mixed flow box 3 is provided with an on-site liquid level gauge 19, which is used to display the real-time liquid level of the mixed flow box 3, which is convenient for personnel to observe the liquid level of the mixed flow box 3 during the fertilization process.

The PLC console includes a power supply 16 (the power supply 16 is a liquid battery), several DC speed regulators 15 (the DC speed regulator 15 is a motor speed regulator, the model is MGSDB1) and several power switches 18, which are used to control the start-up of the fertilizer injection pump. Stop and speed control; the power supply 16 provides power for each driving part, each fertilizer injection pump 13 and each stirring motor, the DC governor 15 is used to adjust the output power of the corresponding fertilizer injection pump 13, and the power supply 16 switch is used for Control the start and stop of the fertilizer injection pump 13 .

In this way, by changing the openings of different hand valves of different groups of fertilizer injection devices, the purpose of different proportions of solution components in the mixed flow box 3 is achieved, and finally, different groups of fertilizer injection devices are adapted to different fertilization needs of different fertilization amounts in different zones.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. fertilizer injection device, is characterized in that, comprises: a sub-packaging part, the sub-packaging part includes a number of boxes and the same number of lower liquid pipes as the box bodies, each of the box bodies is respectively connected to one end of one of the lower liquid pipes, and each of the lower liquid pipes The pipes are respectively provided with valves, and the valve stems of each of the valves extend in the same direction; Mixed-flow part, the mixed-flow part includes a mixed-flow box, the mixed-flow box is arranged at the other end of the lower liquid pipe, and is used to receive the material flowing out of each of the boxes, and the mixed-flow box is provided with a liquid level upper limit and a liquid bit lower limit; A linkage part, the linkage part includes a central shaft, a driving member and a plurality of linkage members, the central shaft is mounted on the mixed flow box through a bearing, one end of the driving member is connected to the central shaft, and the other end is used for To detect the liquid level of the mixed flow box, one end of each of the linkages is connected to the central shaft, and the other end is connected to the valve stem of the valve for controlling the opening or closing of the valve. 2. The fertilizer injection device according to claim 1, characterized in that: each described linkage is an external meshing sheave mechanism, comprising a sheave and a dial, and each described sheave is fixedly connected to one of them respectively On the valve stem of the valve, each of the dials is fixedly connected to the central shaft. 3. fertilizer injection device according to claim 1 is characterized in that: each described linkage is a double rocker mechanism, and the free ends of two rockers of each described double rocker mechanism are respectively fixed on the on the central shaft and one of the valve stems. 4. The fertilizer injection device according to claim 1, characterized in that: each of the linkages comprises a first gear and a second gear that mesh with each other, and each of the first gears is fixedly connected to the central shaft , each of the second gears is respectively fixedly connected to the valve stem of one of the valves. 5. The fertilizer injection device according to any one of claims 2 to 4, wherein the driving member comprises a hydraulic member, a rocker, a disc, a liquid level sensor and a controller, and the center of the disc It is fixedly connected with the central shaft, the hydraulic component is provided with a reciprocating piston rod, one end of the rocker is rotatably connected with the free end of the piston rod, and the other end is rotatably connected with the edge of the disc; The liquid level sensor is installed in the mixed flow tank to detect the liquid level of the mixed flow tank; one end of the controller is connected to the liquid level sensor for receiving the signal value output by the liquid level sensor, The other end is connected to the hydraulic part, and is used for controlling the reciprocating motion of the piston rod of the hydraulic part. 6 . The fertilizer injection device according to claim 4 , wherein the driving element comprises a sliding rod, a rack and a floating ball, the sliding rod is slidably connected to the mixed flow box, and the rack is arranged at the One end of the sliding rod is engaged with one of the first gears, and the floating ball is arranged at the other end of the sliding rod and is in contact with the liquid in the mixed flow box, so as to make the sliding rod Move towards or away from the float. 7. The fertilizer injection device according to claim 6, characterized in that: the mixed flow box is fixed with a bracket, the sliding rod is slidably connected to the bracket, and a spring is sleeved, and one end of the spring is fixedly connected to the sliding rod. On the rod, the other end is fixedly connected to the bracket for increasing the downward sliding power of the sliding rod. 8. The fertilizer injection device according to any one of claims 1 to 4, wherein a stirring shaft is respectively provided in each of the boxes and the mixed flow box for stirring each of the boxes and the liquid in the mixed flow box. 9. The fertilizer injection device according to any one of claims 1 to 4, wherein the valve is a ball valve or a butterfly valve. 10. fertilizer injection system, is characterized in that, comprises: The fertilizer injection device of any one of the above claims 1 to 9, the fertilizer injection device is several groups, wherein the lower end of each of the mixed flow box is provided with a fertilizer suction port, and the fertilizer suction port is sequentially connected with a fertilizer suction pipe, Fertilizer injection pump and fertilizer injection pipe; PLC console, the PLC console includes a power supply, several DC speed regulators and several power switches; the power supply provides power for each of the driving parts and each of the fertilizer injection pumps, and the DC regulator The speed controller is used to adjust the output power of the corresponding fertilizer injection pump, and the power switch is used to control the start and stop of the fertilizer injection pump.

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