阅读说明：本技术 一种冻干生物农药泡腾颗粒的生产设备及方法 (Production equipment and method of freeze-dried biological pesticide effervescent granules ) 是由 隋媛 刘嘉 冷进松 戴媛 于 2021-09-17 设计创作，主要内容包括：本发明涉及杀虫剂制备技术领域,具体是涉及一种冻干生物农药泡腾颗粒的生产设备。包括,挤出装置,其用于输入粉末状原料并且输出条状原料；以及,制粒装置,其用于将条状原料制成颗粒状或者片状；还包括设置在挤出装置的输出端和制粒装置的输入端之间的冷媒覆盖装置,冷媒覆盖装置用于在条状原料上覆盖一层冷媒。本发明还涉及一种冻干生物农药泡腾颗粒的生产方法。(The invention relates to the technical field of pesticide preparation, in particular to production equipment of freeze-dried biological pesticide effervescent granules. Comprises an extrusion device, a control device and a control device, wherein the extrusion device is used for inputting powdery raw materials and outputting strip-shaped raw materials; and a granulating device for granulating the strip-shaped raw material into granules or tablets; the device also comprises a refrigerant covering device arranged between the output end of the extruding device and the input end of the granulating device, and the refrigerant covering device is used for covering a layer of refrigerant on the strip-shaped raw material. The invention also relates to a production method of the freeze-dried biopesticide effervescent granule.)

1. A production device of freeze-dried biological pesticide effervescent granules comprises,

an extrusion device (1) for feeding a powdery raw material and for feeding a strip-shaped raw material; and the number of the first and second groups,

a granulating device (2) for granulating or flaking the strip-shaped raw material;

the device is characterized by further comprising a refrigerant covering device (3) arranged between the output end of the extruding device (1) and the input end of the granulating device (2), wherein the refrigerant covering device (3) is used for covering a layer of refrigerant on the strip-shaped raw material.

2. The apparatus for producing lyophilized biopesticide effervescent granule as claimed in claim 1, wherein the cooling medium is dry ice in powder form.

3. A production facility of freeze-dried biopesticide effervescent granules according to claim 1, wherein the extruding device (1) comprises,

the first extrusion cylinder (1a), the first extrusion cylinder (1a) comprises a first feeding section (1a1) and a first extrusion section (1a2) which are coaxially connected, the first feeding section (1a1) is in a cylinder shape, the first extrusion section (1a2) is in a cone cylinder shape, the first extrusion section (1a2) is reduced in diameter in a direction away from the first feeding section (1a1), the first extrusion section (1a2) faces the input end of the granulating device (2), and the middle end of the first feeding section (1a1) is provided with a first feeding hole (1a 3); and the number of the first and second groups,

the first screw rod (1b) is rotatably arranged in the first extrusion cylinder (1a), the first screw rod (1b) extends from one end of the first extrusion cylinder (1a) to the other end of the first extrusion cylinder (1a), and the blade edge of the first screw rod (1b) is in clearance fit with the inner wall of the first extrusion cylinder (1 a); and the number of the first and second groups,

and the motor (1c) is arranged at one end of the first feeding section (1a1) far away from the first extrusion section (1a2), and the motor (1c) is used for driving the first spiral rod (1b) to rotate.

4. The production equipment of the freeze-dried biopesticide effervescent granule as claimed in claim 3, wherein the refrigerant covering device (3) comprises,

a second extrusion cylinder (3a), wherein the second extrusion cylinder (3a) comprises a first input section (3a1), a second feed section (3a2) and a second extrusion section (3a3) which are coaxial and connected in sequence, the first input section (3a1) is in a cone cylinder shape, the first input section (3a1) expands in diameter towards a direction far away from the first extrusion section (1a2), the first input section (3a1) is coaxially connected with the first extrusion section (1a2), the second feed section (3a2) is in a cylinder shape, a second feed opening (3a4) is arranged at the middle end of the second feed section (3a2), the second extrusion section (3a3) is in a cone cylinder shape, and the second extrusion section (3a3) reduces in diameter towards a direction far away from the second feed section (3a 2); and the number of the first and second groups,

the second screw rod (3b) is rotatably installed inside the second extrusion cylinder (3a), the second screw rod (3b) extends to the other end of the second extrusion cylinder (3a) from one end of the second extrusion cylinder (3a), the blade edge of the second screw rod (3b) is in clearance fit with the inner wall of the second extrusion cylinder (3a), and the second screw rod (3b) is coaxially connected with the first screw rod (1 b).

5. The production equipment of the freeze-dried biopesticide effervescent granule as claimed in claim 3, wherein the refrigerant covering device (3) comprises,

a third extrusion cylinder (3c), wherein the third extrusion cylinder (3c) comprises a second input section (3c1), a third feed section (3c2) and a third extrusion section (3c3) which are coaxial and connected in sequence, the second input section (3c1) is arranged coaxially with the first extrusion section (1a2), an annular gap (3c4) is arranged between the second input section (3c1) and the first extrusion section (1a2), the second input section (3c1) is in a cone cylinder shape, the second input section (3c1) expands in a diameter direction far away from the 1c2, the third feed section (3c2) is in a cylinder shape, the third extrusion section (3c3) is in a cone cylinder shape, and the third extrusion section (3c3) reduces in a diameter direction far away from the third feed section (3c 2); and the number of the first and second groups,

the third screw rod (3d) is rotatably arranged in the third extrusion cylinder (3c), the third screw rod (3d) extends from one end of the third extrusion cylinder (3c) to the other end of the third extrusion cylinder (3c), the blade edge of the third screw rod (3d) is in clearance fit with the inner wall of the third extrusion cylinder (3c), and the third screw rod (3d) is coaxially connected with the first screw rod (1 b); and the number of the first and second groups,

guide tube (3e), guide tube (3e) are established barrel (3e1) in first extrusion section (1a2) outside including coaxial cover, and first extrusion section (1a2) is connected with second input section (3c1) through barrel (3e1), and barrel (3e1) and the clearance between first extrusion section (1a2) constitute the cylindric cavity, are provided with on barrel (3e1) and lead to the inside third feed inlet (3e2) of cylindric cavity.

6. A production plant of lyophilized biopesticide effervescent granules according to claim 3, characterized in that the coolant covering device (3) comprises an electrostatic powder coating machine (3f), the output end of the electrostatic powder coating machine (3f) facing between the output end of the extrusion device (1) and the input end of the granulation device (2).

7. A production facility of lyophilized biopesticide effervescent granules according to claim 6, characterized in that the production facility further comprises a powder suction machine (4), the input end of the powder suction machine (4) is directed between the output end of the extrusion device (1) and the input end of the granulation device (2).

8. A production facility of lyophilized biopesticide effervescent granules according to claim 7, characterized in that the input end of the powder suction machine (4) is provided with a static eliminator (4 a).

9. A production method of freeze-dried biological pesticide effervescent granules is characterized by comprising the following steps,

s1, obtaining a powdered mixture of effervescent granules and lyophilized biopesticide dispersion;

s2, extruding the powdery mixture to form strips;

s3, forming a layer of dry ice on the surface of the strip-shaped powder;

and S4, making the strip-shaped powder with the surface covered with the dry ice into a particle shape or a sheet shape.

10. The method for producing lyophilized biopesticide effervescent granule according to claim 9, wherein the step S4 includes the following optional step,

s4a, preparing the strip-shaped powder with the surface covered with the dry ice into a particle shape by using a granulator;

and S4b, preparing the strip-shaped powder with the surface covered with the dry ice into a tablet shape by using a tablet press.

Technical Field

The invention relates to the technical field of pesticide preparation, in particular to production equipment of freeze-dried biological pesticide effervescent granules. The invention also relates to a production method of the freeze-dried biopesticide effervescent granule.

Background

Biopesticides (biopesticides) are obtained from various living materials such as animals, plants, bacteria and various minerals and are used for pest control. The freeze-drying process can keep the stability of sensitive biological pesticides, the inner layer and the outer layer of the biological pesticides do not deform, special condition storage is not required, and the biological pesticides can keep the initial state.

Equipment for preparing effervescent granules generally uses granulators and tabletting machines, for example:

patent application No. CN201410062604.9 discloses a dry granulator.

Patent application No. cn201610863897.x discloses a method for operating a rotary tablet press and a rotary tablet press.

Because the biological pesticide has high heat sensitivity and is easily inactivated by high temperature, the problem that how to make the biological pesticide into effervescent granules in a low-temperature environment is needed to be solved is that the patent application No. CN201510434690.6 discloses a dry-process granulator, and the invention reduces the heat of an extrusion roller by arranging a water channel on the extrusion roller and intermittently or continuously injecting cooling water in the process of extruding raw materials, thereby avoiding the material from being overheated and deteriorated. The above improvements complicate the structure of the device, which requires not only the addition of a cooling water circulation system, but also the addition of a large number of anti-seepage structures to avoid water leakage, making the device expensive to produce, use and maintain.

Therefore, there is a need for a less expensive apparatus that also allows the biopesticide to be formed into effervescent granules in low temperature environments.

Disclosure of Invention

In order to solve the technical problem, the application provides a production device of freeze-dried biopesticide effervescent granules, which comprises an extrusion device, a control device and a control device, wherein the extrusion device is used for inputting powdery raw materials and outputting strip-shaped raw materials; and a granulating device for granulating the strip-shaped raw material into granules or tablets; the device also comprises a refrigerant covering device arranged between the output end of the extruding device and the input end of the granulating device, and the refrigerant covering device is used for covering a layer of refrigerant on the strip-shaped raw material.

Preferably, the cooling medium is dry ice in the form of powder.

Preferably, the extrusion device comprises a first extrusion cylinder, the first extrusion cylinder comprises a first feeding section and a first extrusion section which are coaxially connected, the first feeding section is in a cylinder shape, the first extrusion section is in a cone shape, the diameter of the first extrusion section is reduced towards the direction far away from the first feeding section, the first extrusion section faces the input end of the granulating device, and the middle end of the first feeding section is provided with a first feeding hole; the first screw rod is rotatably arranged in the first extrusion cylinder, the first screw rod extends from one end of the first extrusion cylinder to the other end of the first extrusion cylinder, and the edge of a blade of the first screw rod is in clearance fit with the inner wall of the first extrusion cylinder; and the motor is arranged at one end of the first feeding section, which is far away from the first extrusion section, and is used for driving the first screw rod to rotate.

Preferably, the refrigerant covering device comprises a second extrusion cylinder, the second extrusion cylinder comprises a first input section, a second feeding section and a second extrusion section which are coaxially and sequentially connected, the first input section is in a conical cylinder shape, the diameter of the first input section is expanded towards the direction far away from the first extrusion section, the first input section is coaxially connected with the first extrusion section, the second feeding section is in a cylindrical shape, a second feeding hole is formed in the middle end of the second feeding section, the second extrusion section is in a conical cylinder shape, and the diameter of the second extrusion section is reduced towards the direction far away from the second feeding section; and the second screw rod is rotatably arranged inside the second extrusion cylinder, the second screw rod extends to the other end of the second extrusion cylinder from one end of the second extrusion cylinder, the blade edge of the second screw rod is in clearance fit with the inner wall of the second extrusion cylinder, and the second screw rod is coaxially connected with the first screw rod.

Preferably, the refrigerant covering device comprises a third extrusion cylinder, the third extrusion cylinder comprises a second input section, a third feed section and a third extrusion section which are coaxial and connected in sequence, the second input section and the first extrusion section are arranged coaxially, an annular gap is arranged between the second input section and the first extrusion section, the second input section is in a conical cylinder shape, the diameter of the second input section is expanded in a direction away from 1c2, the third feed section is in a cylindrical shape, the third extrusion section is in a conical cylinder shape, and the diameter of the third extrusion section is reduced in a direction away from the third feed section; the third screw rod is rotatably arranged in the third extrusion cylinder, the third screw rod extends from one end of the third extrusion cylinder to the other end of the third extrusion cylinder, the edge of a blade of the third screw rod is in clearance fit with the inner wall of the third extrusion cylinder, and the third screw rod is coaxially connected with the first screw rod; and the guide cylinder comprises a cylinder body coaxially sleeved on the outer side of the first extrusion section, the first extrusion section is connected with the second input section through the cylinder body, a gap between the cylinder body and the first extrusion section forms a cylindrical cavity, and a third feed inlet communicated to the inside of the cylindrical cavity is formed in the cylinder body.

Preferably, the cooling medium covering device comprises an electrostatic powder coating machine, and an output end of the electrostatic powder coating machine faces between an output end of the extruding device and an input end of the granulating device.

Preferably, the production plant further comprises a powder suction machine, the input end of which faces between the output end of the extrusion device and the input end of the granulation device.

Preferably, the input end of the powder suction machine is provided with a static eliminator.

The present application also provides a method for producing a lyophilized biopesticide effervescent granule, comprising the steps of, S1, obtaining a powdered mixture of the effervescent granule and the lyophilized biopesticide dispersion; s2, extruding the powdery mixture to form strips; s3, forming a layer of dry ice on the surface of the strip-shaped powder; and S4, making the strip-shaped powder with the surface covered with the dry ice into a particle shape or a sheet shape.

Preferably, the step S4 includes an optional step of, S4a, forming the strip-shaped powder covered with dry ice on the surface into a pellet shape using a pelletizer; and S4b, preparing the strip-shaped powder with the surface covered with the dry ice into a tablet shape by using a tablet press.

Compared with the prior art, the application has the beneficial effects that:

according to the application, the powdery mixture of the effervescent granules and the freeze-dried biological pesticide dispersion is extruded into a strip shape suitable for coating the powder through lower pressure, then a layer of refrigerant is formed on the surface of the strip shape, and the heat generated when the effervescent granules and the freeze-dried biological pesticide dispersion are made into granules or sheets is absorbed through the refrigerant, so that the freeze-dried biological pesticide dispersion is not inactivated due to high temperature, and a complex cooling system is not required to be added.

Drawings

FIG. 1 is a front view of a first embodiment of the invention;

FIG. 2 is a perspective view of a first embodiment of the invention;

FIG. 3 is a side view of a first embodiment of the invention;

FIG. 4 is a cross-sectional view at section A-A of FIG. 3;

FIG. 5 is a partial enlarged view of FIG. 4 at B;

FIG. 6 is a side view of a second embodiment for carrying out the invention;

FIG. 7 is a cross-sectional view at section C-C of FIG. 6;

FIG. 8 is an enlarged view of a portion of FIG. 7 at D;

FIG. 9 is a perspective view of a third embodiment of the invention;

FIG. 10 is a top view of a third embodiment embodying the present invention;

FIG. 11 is a cross-sectional view at section E-E of FIG. 10;

FIG. 12 is a cross-sectional view at section F-F of FIG. 10;

FIG. 13 is a flow chart of a method of implementing the present invention;

the reference numbers in the figures are:

1-an extrusion device; 1 a-a first barrel; 1a 1-first feed section; 1a2 — first extrusion section; 1a 3-first feed inlet; 1a 4-circlip; 1 b-a first screw rod; 1 c-a motor; 1 d-coupler; 1 e-a bearing; 1 f-sealing ring;

2-a granulating device;

3-refrigerant covering device; 3 a-a second barrel; 3a1 — first input segment; 3a 2-second feed section; 3a3 — second extrusion section; 3a 4-second feed inlet; 3 b-a second screw; 3 c-a third barrel; 3c1 — second input segment; 3c 2-third feed stage; 3c 3-third extrusion section; 3c4 — annular gap; 3 d-a third screw; 3 e-a material guide cylinder; 3e 1-barrel; 3e 2-third feed inlet; 3 f-electrostatic powder coating machine;

4-powder suction machine; 4 a-static eliminator.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.

The first embodiment is as follows:

in order to solve the technical problem that the freeze-dried biological pesticide powder loses activity due to the fact that the temperature of a material, a die or a tablet pressing wheel is increased due to the extrusion effect when the freeze-dried biological pesticide powder is tabletted or stamped, as shown in fig. 1 to 12, the following preferred technical scheme is provided:

a production device of freeze-dried biological pesticide effervescent granules comprises,

an extrusion device 1 for inputting a powdery raw material and outputting a bar-shaped raw material; and the number of the first and second groups,

a granulating device 2 for granulating or flaking the strip-shaped raw material;

the device also comprises a refrigerant covering device 3 arranged between the output end of the extruding device 1 and the input end of the granulating device 2, and the refrigerant covering device 3 is used for covering a layer of refrigerant on the strip-shaped raw material.

In particular, the granulating device 2 may be a granulator or a tablet press, only a tablet pressing wheel is shown in the figure as an illustration, and the rest of the structure and the working principle of the granulating device 2 are already known in the background art and will not be described herein.

Before the freeze-dried biological pesticide is tabletted or stamped, a layer of refrigerant covers the surface of the freeze-dried biological pesticide in advance, so that when the freeze-dried biological pesticide is violently extruded by a tabletting mold or a tabletting wheel, the heat generated on the freeze-dried biological pesticide and the mold or the tabletting wheel is absorbed by the refrigerant, the freeze-dried biological pesticide and the mold or the tabletting wheel cannot be heated, the problem that freeze-dried biological pesticide powder loses activity is solved, meanwhile, a complex cooling and sealing structure is not added in a system, and the production and use cost is reduced.

In order to solve the technical problem that the disintegration and dissolution speeds of the effervescent granules or effervescent tablets are affected to a certain extent as the refrigerant covers the surfaces of the freeze-dried biopesticide effervescent granules or effervescent tablets, the following preferable technical scheme is provided:

the refrigerant is dry ice in powder form.

Specifically, when the freeze-dried biological pesticide is violently extruded by a tabletting mold or a tabletting wheel, the dry ice covering the surface of the freeze-dried biological pesticide is quickly gasified and evaporated under the extrusion effect, and the dry ice disappears from the final product while taking away heat, so that the disintegration and dissolution speeds of the effervescent granules or effervescent tablets are not influenced.

Example two:

in order to solve the technical problem of how to extrude the powdery raw material into strip raw material, as shown in fig. 1 to 5, the following preferred technical solutions are provided:

the extrusion apparatus 1 comprises a device for extruding a plastic material,

the first extruder barrel 1a comprises a first feeding section 1a1 and a first extruding section 1a2 which are coaxially connected, the first feeding section 1a1 is in a cylindrical shape, the first extruding section 1a2 is in a conical cylinder shape, the first extruding section 1a2 is reduced in diameter in a direction away from the first feeding section 1a1, the first extruding section 1a2 faces the input end of the granulating device 2, and the middle end of the first feeding section 1a1 is provided with a first feeding hole 1a 3; and the number of the first and second groups,

the first screw rod 1b is rotatably arranged in the first extrusion cylinder 1a, the first screw rod 1b extends from one end of the first extrusion cylinder 1a to the other end of the first extrusion cylinder 1a, and the blade edge of the first screw rod 1b is in clearance fit with the inner wall of the first extrusion cylinder 1 a; and the number of the first and second groups,

and a motor 1c arranged at one end of the first feeding section 1a1 far away from the first extrusion section 1a2, wherein the motor 1c is used for driving the first screw rod 1b to rotate.

Specifically, the method comprises the following steps:

the first feed port 1a3 is communicated with a raw material output device, and an embodiment of the raw material output device is shown in fig. 4 as an illustration and comprises a tank body, wherein a discharge pipe communicated to the first feed port 1a3 is arranged at the bottom of the tank body, a screw rod is arranged in the discharge pipe, a motor for driving the screw rod to rotate is arranged at the top of the tank body, a pipeline for inputting raw materials is arranged on one side of the tank body, and an electromagnetic valve is arranged on the pipeline. The material discharge device may also employ a powder blower, a powder delivery pump, or the like that can store and deliver powder, such as an electric motor type vacuum feeder (ZKS type).

As shown in fig. 5, an output shaft of the motor 1c is in transmission connection with the first screw rod 1b through a coupling 1d, a bearing 1e and a sealing ring 1f are installed at one end of the first screw rod 1b close to the motor 1c, and the bearing 1e is fixed through two snap springs 1a4 arranged inside the first extrusion cylinder 1 a.

The first extrusion cylinder 1a, the first screw rod 1b and the motor 1c form a screw extruder, the first screw rod 1b can be more than one, and when the first screw rod 1b has two, the first extrusion cylinder 1a, the first screw rod 1b and the motor 1c form a twin screw extruder, and the working principle is as follows: the first feeding section 1a1 is fed through the first feeding port 1a3, the raw material enters the middle end of the first feeding section 1a1 and falls into the gap between the first screw rod 1b and the first feeding section 1a1, the motor 1c drives the first screw rod 1b to rotate, the first screw rod 1b rotates to drive the raw material to move towards the input end of the granulating device 2, and when the raw material passes through the first extrusion section 1a2, the raw material is extruded in the first extrusion section 1a2 in a single extrusion to form a strip shape because the inner diameter of the first extrusion section 1a2 is smaller than that of the first feeding section 1a 1.

The extrusion pressure in the first extrusion is small, and the temperature of the raw material does not rapidly rise.

In order to solve the technical problem of how to cover a layer of dry ice on the surface of the strip-shaped raw material, as shown in fig. 4 and 5, the following preferred technical solutions are provided:

the refrigerant covering device 3 is provided with a refrigerant covering device,

a second extruder barrel 3a, the second extruder barrel 3a comprising a first input section 3a1, a second input section 3a2 and a second extruder section 3a3 which are coaxially and sequentially connected, the first input section 3a1 is in a cone shape, the first input section 3a1 expands in diameter in a direction away from the first extruder section 1a2, the first input section 3a1 is coaxially connected with the first extruder section 1a2, the second extruder section 3a2 is in a cylinder shape, the middle end of the second extruder section 3a2 is provided with a second feed port 3a4, the second extruder section 3a3 is in a cone shape, and the second extruder section 3a3 reduces in diameter in a direction away from the second extruder section 3a 2; and the number of the first and second groups,

the second screw rod 3b is rotatably arranged inside the second extrusion cylinder 3a, the second screw rod 3b extends from one end of the second extrusion cylinder 3a to the other end of the second extrusion cylinder 3a, the blade edge of the second screw rod 3b is in clearance fit with the inner wall of the second extrusion cylinder 3a, and the second screw rod 3b is coaxially connected with the first screw rod 1 b.

Specifically, the method comprises the following steps:

the second inlet 3a4 is connected to a powder dry ice output device, and fig. 4 shows an embodiment of the dry ice output device as an illustration, and the specific structure of the dry ice output device is the same as that of the raw material output device, and will not be described in detail here.

When the motor 1c drives the first screw rod 1b to rotate, the first screw rod 1b drives the second screw rod 3b to rotate, the strip-shaped raw material with the diameter smaller than that of the second feeding section 3a2 enters the second feeding section 3a2 along with the rotation of the second screw rod 3b, the powdered dry ice enters a gap between the second feeding section 3a2 and the second screw rod 3b through the second feeding hole 3a4, so that the dry ice covers the surface of the strip-shaped raw material and moves towards the second extrusion section 3a3 through the rotation of the second screw rod 3b, and the strip-shaped raw material and the powdered dry ice covering the surface of the strip-shaped raw material are secondarily extruded in the second extrusion section 3a3, so that the strip-shaped raw material with a dry ice coating layer is formed.

Note that the pressing force of the secondary pressing is small, and the dry ice is not rapidly sublimated.

Example two:

in order to solve the technical problem of uneven dry ice powder covering the surface of the extruded strip-shaped raw material in the first embodiment, as shown in fig. 6 to 8, the following improved technical solutions are provided:

the refrigerant covering device 3 is provided with a refrigerant covering device,

a third extrusion cylinder 3c, the third extrusion cylinder 3c including a second input section 3c1, a third input section 3c2, and a third extrusion section 3c3 coaxially and sequentially connected, the second input section 3c1 being coaxially disposed with the first extrusion section 1a2, an annular gap 3c4 being provided between the second input section 3c1 and the first extrusion section 1a2, the second input section 3c1 being in a cone shape, the second input section 3c1 being expanded in a direction away from the first input section 1c2, the third input section 3c2 being in a cylinder shape, the third extrusion section 3c3 being in a cone shape, the third extrusion section 3c3 being reduced in a direction away from the third input section 3c 2; and the number of the first and second groups,

the third screw rod 3d is rotatably installed inside the third extrusion cylinder 3c, the third screw rod 3d extends from one end of the third extrusion cylinder 3c to the other end of the third extrusion cylinder 3c, the blade edge of the third screw rod 3d is in clearance fit with the inner wall of the third extrusion cylinder 3c, and the third screw rod 3d is coaxially connected with the first screw rod 1 b; and the number of the first and second groups,

the guide cylinder 3e comprises a cylinder body 3e1 coaxially sleeved outside the first extrusion section 1a2, the first extrusion section 1a2 is connected with the second input section 3c1 through the cylinder body 3e1, a gap between the cylinder body 3e1 and the first extrusion section 1a2 forms a cylindrical cavity, and a third feed inlet 3e2 communicated to the inside of the cylindrical cavity is arranged on the cylinder body 3e 1.

Specifically, the third feeding port 3e2 is communicated with the powdered dry ice output device, dry ice enters the cylindrical cavity through the third feeding port 3e2 and is accumulated in the annular gap 3c4, when the motor 1c drives the first screw rod 1b to rotate, the first screw rod 1b drives the third screw rod 3d to rotate, strip-shaped raw material with the diameter smaller than that of the third feeding section 3c2 enters the third feeding section 3c2 along with the rotation of the third screw rod 3d, meanwhile, the strip-shaped raw material scrapes dry ice powder accumulated in the annular gap 3c4, so that the dry ice covers the surface of the strip-shaped raw material and moves towards the third extrusion section 3c3 through the rotation of the third screw rod 3d, and the strip-shaped raw material and the powdered dry ice covering the surface of the strip-shaped raw material are secondarily extruded in the third extrusion section 3c3, so that the strip-shaped raw material with the dry ice covering layer is formed.

Example three:

in order to solve the technical problem of how to cover a layer of dry ice on the surface of the strip-shaped raw material, as shown in fig. 9 to 12, the following alternative technical solutions are provided:

the refrigerant covering device 3 comprises an electrostatic powder coating machine 3f, and the output end of the electrostatic powder coating machine 3f faces between the output end of the extruding device 1 and the input end of the granulating device 2.

Specifically, the electrostatic powder coating machine 3f adopts an HX-800 electrostatic powder coating machine, which performs a coating operation on a workpiece by using an electrostatic coating principle, and is equipped with a powder electrostatic spray gun, a controller and a set of small powder supply system, and the electrostatic powder coating machine 3f effectively coats dry ice powder on the strip-shaped raw material by controlling static electricity and aerodynamic force, and achieves complete coverage.

In order to solve the technical problem of how to recover the excessive dry ice powder sprayed by the electrostatic powder coating machine 3f, as shown in fig. 12, the following preferable technical solutions are provided:

the production plant also comprises a powder suction machine 4, the input end of which powder suction machine 4 faces between the output end of the extrusion device 1 and the input end of the granulation device 2.

Specifically, the powder suction machine 4 adopts a special dust collector on a tablet press, and the working principle is as follows: the dry ice powder which is not adsorbed on the strip-shaped raw material is sucked away by the vacuum action and collected to one place for reuse, and only the suction pipeline thereof is shown as an illustration.

In order to solve the technical problem that the dry ice powder with charges is easily adsorbed on the inner wall of the suction pipeline of the powder suction machine 4, which causes poor suction effect, as shown in fig. 12, the following preferred technical scheme is provided:

the input end of the powder suction machine 4 is provided with a static eliminator 4 a.

Specifically, the static eliminator 4a employs a QP-YS circular static eliminator for eliminating the electric charge on the dry ice powder sucked to the inside of its pipe by the powder suction machine 4, so that the dry ice powder can be smoothly sucked by the powder suction machine 4.

The prior art has disclosed how to obtain freeze-dried effervescent biopesticide granules, such as:

step one, mixing biological pesticide and milk;

step two, freeze-drying treatment, wherein water in the product is removed;

step three, obtaining a final freeze-drying mixture;

step four, preparing effervescent granules when mixing acid and carbonate;

step five, mixing the effervescent granules and the freeze-dried biological pesticide dispersion;

step six, obtaining freeze-dried effervescent biopesticide granules as a final product;

in order to solve the technical problem that the freeze-dried biological pesticide dispersion is easy to inactivate at high temperature when the effervescent granules and the freeze-dried biological pesticide dispersion are prepared into a final product, as shown in fig. 13, the following steps are required to be added between the fifth step and the sixth step,

s1, obtaining a powdered mixture of effervescent granules and lyophilized biopesticide dispersion;

s2, extruding the powdery mixture to form strips;

s3, forming a layer of dry ice on the surface of the strip-shaped powder;

and S4, making the strip-shaped powder with the surface covered with the dry ice into a particle shape or a sheet shape.

Step S4 includes the following optional one step,

s4a, preparing the strip-shaped powder with the surface covered with the dry ice into a particle shape by using a granulator;

and S4b, preparing the strip-shaped powder with the surface covered with the dry ice into a tablet shape by using a tablet press.

According to the application, the powdery mixture of the effervescent granules and the freeze-dried biological pesticide dispersion is extruded into a strip shape suitable for coating the powder through lower pressure, then a layer of refrigerant is formed on the surface of the strip shape, and the heat generated when the effervescent granules and the freeze-dried biological pesticide dispersion are made into granules or sheets is absorbed through the refrigerant, so that the freeze-dried biological pesticide dispersion is not inactivated due to high temperature, and a complex cooling system is not required to be added.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.