Low-temperature drying and granulating equipment for compound microbial fertilizer

Abstract

The invention relates to the technical field of compound fertilizer production, in particular to compound microorganism fertilizer low-temperature drying granulation equipment which comprises a processing box and a conveying barrel, the conveying barrel is mounted in the processing box, a driving mechanism is arranged on the outer side of the conveying barrel, a feeding opening is fixedly formed in the top of the conveying barrel, and a discharging opening is formed in the top of the conveying barrel. And a discharging opening is fixedly formed in the bottom of the conveying charging barrel, and a multi-stage heating mechanism is arranged in the processing box body. Through the arrangement of the multi-stage heating mechanism, the interior of the processing box body is divided into the main heating area, the auxiliary temperature control area and the heat preservation area for partitioned heating design, a single heating element is changed into multi-area independent temperature control, temperature difference control in the areas is achieved, the main heating area achieves rapid heating and the core temperature area is stable, and the auxiliary temperature control area eliminates the thermal boundary effect; the overall temperature uniformity is improved, and the strict requirement of bioactive substances on the temperature field uniformity is met.

Description

Technical Field

[0001] This invention relates to the field of compound fertilizer production technology, specifically to a low-temperature drying and granulation equipment for compound microbial fertilizer. Background Technology

[0002] Fertilizers are substances that provide one or more essential nutrients for plants, improve soil properties, and enhance soil fertility. They are one of the material foundations of agricultural production. Fertilizers include compound microbial fertilizers, which are live microbial products made by combining specific microorganisms with nutrients. They can provide, maintain, or improve plant nutrition, increase agricultural product yield, or improve agricultural product quality. When producing fertilizers, granulation equipment is needed to granulate the raw materials.

[0003] However, in the processing of compound microbial fertilizers, the temperature control precision of traditional drying equipment is insufficient, resulting in a 40% to 60% decrease in the survival rate of functional bacteria such as Bacillus subtilis during granulation. This directly affects the biological activity of the fertilizer, reduces the field application effect, and has low energy efficiency. To address these issues, we propose a low-temperature drying and granulation equipment for compound microbial fertilizers. Summary of the Invention

[0004] The purpose of this invention is to provide a low-temperature drying and granulation device for compound microbial fertilizers, in order to solve the problems mentioned in the background art, such as insufficient temperature control precision of traditional drying equipment, which leads to a decrease in the survival rate of functional bacteria such as Bacillus subtilis during the granulation process, affecting the biological activity of fertilizers, reducing the field application effect, and low energy efficiency.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a low-temperature drying and granulation equipment for compound microbial fertilizer, comprising a processing box and a conveying cylinder, wherein the conveying cylinder is installed inside the processing box, a driving mechanism is provided on the outside of the conveying cylinder, an inlet is fixedly installed on the top of the conveying cylinder, an outlet is fixedly installed on the bottom of the conveying cylinder, and a multi-stage heating mechanism is provided inside the processing box.

[0006] The multi-stage heating mechanism includes a first partition, a second partition, an electromagnetic coil, and a silicon carbide heating rod. The processing box is equipped with a first partition and a second partition, which divide the interior of the processing box into a main heating zone, an auxiliary temperature control zone, and a heat preservation zone. An electromagnetic coil is located on the left side of the first partition, and a silicon carbide heating rod is located on the left side of the second partition.

[0007] Preferably, the drive mechanism includes a fixed frame, a servo motor, a drive wheel, a synchronous belt, a driven wheel, and a transmission rod. The fixed frame is fixedly installed at the bottom of the processing box, the servo motor is fixedly installed on the surface of the fixed frame, the output end of the servo motor is fixedly connected to the drive wheel, the outer side of the drive wheel is movably connected to the synchronous belt, the other end of the synchronous belt is movably connected to the driven wheel, and the right end of the driven wheel is fixedly connected to the transmission rod.

[0008] Preferably, the first partition and the second partition are fixedly connected to the inner wall of the processing box at equal intervals, electromagnetic coils are installed at equal intervals inside the main heating zone, and silicon carbide heating rods are installed at equal intervals inside the auxiliary temperature control zone.

[0009] Preferably, the top of the processing box is provided with a waste heat recovery mechanism, which includes a top cover, a first ventilation plate, a third partition, a fourth partition, a first connecting pipe, a plate heat exchanger, a fan, and a second connecting pipe. The top of the processing box is fixedly connected to the top, and the first ventilation plate is installed on the top of the processing box. The outer side of the top cover is fixedly connected to the first connecting pipe, and the outer side of the first connecting pipe is fixedly connected to the plate heat exchanger. The outer side of the plate heat exchanger is installed with a fan, and the other side of the plate heat exchanger is fixedly connected to the second connecting pipe. The other end of the second connecting pipe is connected to the top of the first connecting pipe.

[0010] Preferably, a cooling mechanism is provided on the outer side of the conveying cylinder. The cooling mechanism includes a fan, a second ventilation plate and a third ventilation plate. A fan is fixedly installed on the bottom inner wall of the processing box. A second ventilation plate is installed on the bottom outer side of the processing box. A third ventilation plate is fixedly installed on the outer side of the top cover.

[0011] Preferably, the cooling mechanism further includes a cooling pipe, a first solenoid valve, and a second solenoid valve. The outer surface of the conveying cylinder is spirally provided with a cooling pipe. The right end of the cooling pipe is fixedly installed with the first solenoid valve, and the left end of the cooling pipe is fixedly installed with the second solenoid valve.

[0012] Preferably, three sets of temperature and humidity sensors are installed on the top of the processing chamber, and the three sets of temperature and humidity sensors are respectively located at the top center of the main heating zone, the auxiliary temperature control zone and the heat preservation zone.

[0013] Preferably, the first and second partitions have equidistant connecting holes inside, and the diameter of the connecting holes is designed in a gradient manner.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. This invention uses a multi-stage heating mechanism to divide the interior of the processing chamber into a main heating zone, an auxiliary temperature control zone, and a heat preservation zone for zoned heating design. It replaces a single heating element with independent temperature control in multiple zones, achieving temperature difference control within each zone. The main heating zone achieves rapid heating and stable core temperature zone, while the auxiliary temperature control zone eliminates thermal boundary effects, thereby improving overall temperature uniformity and meeting the stringent requirements of bioactive substances for temperature field uniformity.

[0016] 2. This invention utilizes a waste heat recovery mechanism, employing a plate heat exchanger and a fan to recover waste heat from exhaust gas and preheat fresh air within the insulation zone, thereby reducing heating energy consumption. A humidity sensor is required to prevent excessive moisture content in the circulating gas. The plate heat exchanger and fan installed on the outside facilitate counter-current heat exchange between the internal exhaust air and fresh air. After utilizing the waste heat, gas consumption decreases, achieving energy-saving drying.

[0017] 3. The present invention improves the air circulation efficiency inside the device by setting up a cooling mechanism and cooperating with a fan, a second ventilation plate and a third ventilation plate. It also accelerates the temperature transfer on the surface of the conveying cylinder by cooperating with a cooling pipe, a first solenoid valve and a second solenoid valve. With the integrated air cooling and water cooling dual system, it can start up quickly when there is abnormal temperature rise, thereby improving the cooling rate. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a front view schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the drive mechanism of the present invention;

[0021] Figure 3 This is a schematic diagram of the multi-stage heating mechanism of the present invention;

[0022] Figure 4 This is a schematic diagram of the waste heat recovery mechanism of the present invention;

[0023] Figure 5 This is a schematic diagram of the cooling mechanism of the present invention.

[0024] In the diagram: 1. Processing box; 2. Conveying cylinder; 3. Drive mechanism; 301. Fixing frame; 302. Servo motor; 303. Drive wheel; 304. Synchronous belt; 305. Driven wheel; 306. Transmission rod; 4. Feed inlet; 5. Discharge outlet; 6. Multi-stage heating mechanism; 601. First partition; 602. Second partition; 603. Main heating zone; 604. Auxiliary temperature control zone; 605. Insulation zone; 606. Electromagnetic coil; 607. Silicon carbide heating rod; 7. Waste heat recovery mechanism; 701. Top cover; 702. First ventilation plate; 703. Third partition; 704. Fourth partition; 705. First connecting pipe;

[0025] 706. Plate heat exchanger; 707. Fan; 708. Second connecting pipe; 8. Cooling mechanism;

[0026] 801. Fan; 802. Second ventilation plate; 803. Third ventilation plate; 804. Cooling pipe;

[0027] 805, First solenoid valve; 806, Second solenoid valve; 9, Temperature and humidity sensor; 10, Connecting hole. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figure 1-5This invention provides an embodiment of a low-temperature drying and granulation equipment for compound microbial fertilizer, comprising a processing chamber 1 and a conveying cylinder 2. The conveying cylinder 2 is installed inside the processing chamber 1, and a drive mechanism 3 is provided on the outside of the conveying cylinder 2. The conveying cylinder 2 is a commonly used granulation equipment in fertilizer equipment, mainly used to form granular fertilizer by stirring, extruding and rolling materials. Its working principle combines mechanical stirring, extrusion molding and rolling polishing processes, which is a relatively mature existing technology and will not be explained in detail here. A feed inlet 4 is fixedly installed at the top of the conveying cylinder 2, and a conveyor belt can be equipped on the outside of the feed inlet 4 to facilitate the material to directly enter the conveying cylinder 2 through the feed inlet 4. A discharge outlet 5 is fixedly installed at the bottom of the conveying cylinder 2, and the formed compound fertilizer flows out from the discharge outlet 5 for easy collection. The processing chamber 1 contains... The unit is equipped with a multi-stage heating mechanism 6; an electrical control box is provided outside the processing box 1, and the electrical control box is equipped with a communication module, an information conversion module, a control module and a power supply module. The communication module transmits information inside the equipment, the information conversion module converts internal detection information to the electrical control box, and the control module and power supply module supply power and control the equipment. The multi-stage heating mechanism 6 includes a first partition 601, a second partition 602, an electromagnetic coil 606 and a silicon carbide heating rod 607. The processing box 1 is equipped with a first partition 601 and a second partition 602, which divide the processing box 1 into a main heating zone 603, an auxiliary temperature control zone 604 and a heat preservation zone 605. An electromagnetic coil 606 is provided on the left side of the first partition 601, and a silicon carbide heating rod 607 is provided on the left side of the second partition 602.

[0030] This device, through the setup of a multi-stage heating mechanism 6 and a waste heat recovery mechanism 7, solves the problems of insufficient temperature control precision in traditional drying equipment, which leads to a decrease in the survival rate of functional bacteria such as Bacillus subtilis during granulation, affecting fertilizer biological activity, reducing field application effectiveness, and low energy efficiency.

[0031] Furthermore, the drive mechanism 3 includes a fixed frame 301, a servo motor 302, a drive wheel 303, a synchronous belt 304, a driven wheel 305, and a transmission rod 306. The fixed frame 301 is fixedly installed at the bottom of the processing housing 1. The servo motor 302 is fixedly installed on the surface of the fixed frame 301. The output end of the servo motor 302 is fixedly connected to the drive wheel 303. The synchronous belt 304 is movably connected to the outer side of the drive wheel 303. The driven wheel 305 is movably connected to the other end of the synchronous belt 304. Protective housings are provided on the outer sides of the drive wheel 303, the synchronous belt 304, and the driven wheel 305 to avoid affecting their rotation. The transmission rod 306 is fixedly connected to the right end of the driven wheel 305. Figure 2As shown, this structure is used to drive the drive wheel 303 to rotate by starting the servo motor 302, and under the action of the synchronous belt 304, the driven wheel 305 and the transmission rod 306 rotate to convey the material in the conveying cylinder 2.

[0032] Furthermore, the first partition 601 and the second partition 602 are fixedly connected at equal intervals to the inner wall of the processing box 1. Electromagnetic coils 606 are installed at equal intervals inside the main heating zone 603. Twelve sets of electromagnetic coils 606 are evenly distributed outside the conveying cylinder 2. Through an alternating magnetic field, they directly generate eddy currents within the metal material, resulting in rapid response and high energy density. This allows for the rapid establishment of a basic temperature field and maintenance of the 50-65℃ core temperature zone required for microbial activity. Silicon carbide heating rods 607 are installed at equal intervals inside the auxiliary temperature control zone 604. These heating rods are arranged in a hexagonal pattern with a honeycomb structure spaced 30cm apart, primarily compensating for the temperature field attenuation caused by the edge effect of the electromagnetic coils 606. Figure 3 As shown, this structure is used to precisely regulate the temperature between 50-65°C through a ring-shaped layout.

[0033] Furthermore, a waste heat recovery mechanism 7 is provided on the top of the processing box 1. The waste heat recovery mechanism 7 includes a top cover 701, a first ventilation plate 702, a third partition 703, a fourth partition 704, a first connecting pipe 705, a plate heat exchanger 706, a fan 707, and a second connecting pipe 708. The top cover 701 is fixedly connected to the top of the processing box 1. The first ventilation plate 702 is installed on the top of the processing box 1. The first connecting pipe 705 is fixedly connected to the outer side of the top cover 701. The plate heat exchanger 706 is fixedly connected to the outer side of the first connecting pipe 705. The fan 707 is installed on the outer side of the plate heat exchanger 706. The second connecting pipe 708 is fixedly connected to the other side of the plate heat exchanger 706. The other end of the second connecting pipe 708 is connected to the top of the first connecting pipe 705. Figure 4 As shown, this structure is used to discharge the residual heat from the top of the main heating zone 603 and the auxiliary temperature control zone 604 through the first ventilation plate 702 via the fan 707, and then transport it to the insulation zone 605 through the first connecting pipe 705, the plate heat exchanger 706 and the second connecting pipe 708, thereby saving resources and reducing consumption costs.

[0034] Furthermore, a cooling mechanism 8 is provided on the outer side of the conveying cylinder 2. The cooling mechanism 8 includes a fan 801, a second ventilation plate 802, and a third ventilation plate 803. The fan 801 is fixedly installed on the inner bottom wall of the processing box 1, the second ventilation plate 802 is installed on the outer bottom of the processing box 1, and the third ventilation plate 803 is fixedly installed on the outer side of the top cover 701. Figure 5As shown, this structure is used to cool the interior of the processing chamber 1 by activating the fan 801 and introducing outside air into the processing chamber 1 through the second ventilation plate 802, and then expelling the air inside the processing chamber 1 through the third ventilation plate 803.

[0035] Furthermore, the cooling mechanism 8 also includes a cooling pipe 804, a first solenoid valve 805, and a second solenoid valve 806. The cooling pipe 804 is spirally arranged on the outer surface of the conveying cylinder 2. The first solenoid valve 805 is fixedly installed at the right end of the cooling pipe 804, and the second solenoid valve 806 is fixedly installed at the left end of the cooling pipe 804. Figure 5 As shown, this structure is used to connect to an external connecting pipe through a first solenoid valve 805 and a second solenoid valve 806, so that coolant enters the interior of the cooling pipe 804 and carries away the heat from the surface of the conveying cylinder 2 through the cooling pipe 804, thereby accelerating the cooling effect.

[0036] Furthermore, three sets of temperature and humidity sensors 9 are installed on the top of the processing chamber 1. These three sets of sensors 9 are respectively located at the center of the top of the main heating zone 603, the auxiliary temperature control zone 604, and the insulation zone 605. Figure 5 As shown, this structure is used to independently measure the temperature of each zone through temperature and humidity sensors 9 independently installed in the main heating zone 603, auxiliary temperature control zone 604 and heat preservation zone 605. When the temperature difference is >0.5℃, it automatically starts to compensate for heating or to prevent abnormal temperature rise.

[0037] Furthermore, the first partition 601 and the second partition 602 have equidistant connecting holes 10 inside, and the diameters of the connecting holes 10 are designed in a gradient manner. For example... Figure 3 As shown, the structure is designed with multiple interconnected holes 10 through the first partition 601 and the second partition 602, with a gradient pore size design, to ensure a stable laminar flow distribution when the airflow passes through the porous ceramic plate.

[0038] Working principle: When using, such as Figure 1 and Figure 2 As shown, material enters the conveying cylinder 2 through the feed inlet 4. The servo motor 302 is started, driving the drive wheel 303 to rotate. Under the action of the synchronous belt 304, the driven wheel 305 and the transmission rod 306 rotate, conveying the material inside the conveying cylinder 2. Simultaneously, as... Figure 3 As shown, the temperature is controlled according to the type of material. The electromagnetic coil 606 and silicon carbide heating rod 607 are activated. The electromagnetic coil 606 can quickly establish a basic temperature field within the main heating zone 603 and maintain the core temperature zone of 50-65℃ required for microbial activity. The silicon carbide heating rod 607 eliminates the thermal boundary effect, improving the overall temperature uniformity from ±3℃ to ±0.8℃. Figure 4As shown, the fan 707 is started to transport the internal waste heat discharged from the top of the main heating zone 603 and the auxiliary temperature control zone 604 through the first ventilation plate 702, through the first connecting pipe 705, the plate heat exchanger 706 and the second connecting pipe 708, into the insulation zone 605, as shown. Figure 5 As shown, the temperature and humidity sensor 9 monitors the temperature and humidity information within the zone in real time. When the temperature difference is >0.5℃, it automatically starts compensation heating, or when the temperature rise is abnormal, it starts the fan 801, the first solenoid valve 805, and the second solenoid valve 806. When the fan 801 is started, outside air is introduced into the processing chamber 1 through the second ventilation plate 802, and the air inside the processing chamber 1 is discharged through the third ventilation plate 803 to cool the inside of the processing chamber 1. At the same time, it is connected to the external connecting pipe through the first solenoid valve 805 and the second solenoid valve 806. Opening the first solenoid valve 805 and the second solenoid valve 806 allows the coolant to enter the cooling pipe 804. The cooling pipe 804 carries away the heat from the surface of the conveying cylinder 2, accelerating the cooling effect, ensuring the survival rate of the bacteria and the dryness of the granules, and allowing the formed compound fertilizer to flow out from the discharge port 5 for centralized collection. The above is the entire working principle of the present invention.

[0039] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A low-temperature drying and granulation device for compound microbial fertilizer, comprising a processing chamber (1) and a conveying cylinder (2), characterized in that: The processing box (1) is equipped with a conveying cylinder (2), a driving mechanism (3) is provided on the outside of the conveying cylinder (2), a feed inlet (4) is fixedly installed on the top of the conveying cylinder (2), a discharge outlet (5) is fixedly installed on the bottom of the conveying cylinder (2), and a multi-stage heating mechanism (6) is provided inside the processing box (1). The multi-stage heating mechanism (6) includes a first partition (601), a second partition (602), an electromagnetic coil (606), and a silicon carbide heating rod (607). The processing box (1) is provided with the first partition (601) and the second partition (602) respectively. The first partition (601) and the second partition (602) divide the processing box (1) into a main heating zone (603), an auxiliary temperature control zone (604), and a heat preservation zone (605). The electromagnetic coil (606) is provided on the left side of the first partition (601), and the silicon carbide heating rod (607) is provided on the left side of the second partition (602).

2. The low-temperature drying and granulation equipment for compound microbial fertilizer according to claim 1, characterized in that: The drive mechanism (3) includes a fixed frame (301), a servo motor (302), a drive wheel (303), a synchronous belt (304), a driven wheel (305), and a transmission rod (306). The fixed frame (301) is fixedly installed at the bottom of the processing box (1). The servo motor (302) is fixedly installed on the surface of the fixed frame (301). The output end of the servo motor (302) is fixedly connected to the drive wheel (303). The synchronous belt (304) is movably connected to the outer side of the drive wheel (303). The driven wheel (305) is movably connected to the other end of the synchronous belt (304). The transmission rod (306) is fixedly connected to the right end of the driven wheel (305).

3. The low-temperature drying and granulation equipment for compound microbial fertilizer according to claim 1, characterized in that: The first partition (601) and the second partition (602) are fixedly connected to the inner wall of the processing box (1) at equal intervals. Electromagnetic coils (606) are installed at equal intervals inside the main heating zone (603), and silicon carbide heating rods (607) are installed at equal intervals inside the auxiliary temperature control zone (604).

4. The low-temperature drying and granulation equipment for compound microbial fertilizer according to claim 1, characterized in that: The top of the processing box (1) is provided with a waste heat recovery mechanism (7), which includes a top cover (701), a first ventilation plate (702), a third partition (703), a fourth partition (704), a first connecting pipe (705), a plate heat exchanger (706), a fan (707), and a second connecting pipe (708). The top cover (701) is fixedly connected to the top of the processing box (1), and the top of the processing box (1) is equipped with a first ventilation plate (702), a third partition (703), a fourth partition (704), a first connecting pipe (705), a plate heat exchanger (706), a fan (707), and a second connecting pipe (708). A ventilation plate (702) is provided. A first connecting pipe (705) is fixedly connected to the outer side of the top cover (701). A plate heat exchanger (706) is fixedly connected to the outer side of the first connecting pipe (705). A fan (707) is installed on the outer side of the plate heat exchanger (706). A second connecting pipe (708) is fixedly connected to the other side of the plate heat exchanger (706). The other end of the second connecting pipe (708) is connected to the top of the first connecting pipe (705).

5. The low-temperature drying and granulation equipment for compound microbial fertilizer according to claim 4, characterized in that: A cooling mechanism (8) is provided on the outside of the conveying cylinder (2). The cooling mechanism (8) includes a fan (801), a second ventilation plate (802) and a third ventilation plate (803). A fan (801) is fixedly installed on the bottom inner wall of the processing box (1). A second ventilation plate (802) is installed on the bottom outer side of the processing box (1). A third ventilation plate (803) is fixedly installed on the outer side of the top cover (701).

6. The low-temperature drying and granulation equipment for compound microbial fertilizer according to claim 5, characterized in that: The cooling mechanism (8) further includes a cooling pipe (804), a first solenoid valve (805), and a second solenoid valve (806). The outer surface of the conveying cylinder (2) is spirally provided with a cooling pipe (804). The first solenoid valve (805) is fixedly installed at the right end of the cooling pipe (804), and the second solenoid valve (806) is fixedly installed at the left end of the cooling pipe (804).

7. The low-temperature drying and granulation equipment for compound microbial fertilizer according to claim 1, characterized in that: Three sets of temperature and humidity sensors (9) are installed on the top of the processing box (1). The three sets of temperature and humidity sensors (9) are respectively located at the top center of the main heating zone (603), the auxiliary temperature control zone (604) and the heat preservation zone (605).

8. The low-temperature drying and granulation equipment for compound microbial fertilizer according to claim 1, characterized in that: The first partition (601) and the second partition (602) have equidistant connecting holes (10) inside, and the diameter of the connecting holes (10) is designed in a gradient manner.

Images