A granulator head and tail material and slip material reprocessing system

Abstract

The application provides a granulator head and tail material and slip material reprocessing system, which comprises a granulator bypass, a granulator discharge port tee, a head and tail material special cooler, a head and tail material crusher, a granulation material to be prepared cyclone separator and a control unit, wherein the granulator bypass is a bypass pipeline in the granulator controlled by a valve, and the outlet of the granulator bypass is connected to the granulator discharge port tee; the granulator discharge port tee is a tee structure with two outlets, one of which is connected to the head and tail material special cooler, and the head and tail material special cooler is connected to the head and tail material crusher; the head and tail material and slip material crushed by the head and tail material crusher enter the granulation material to be prepared cyclone separator after treatment, and the head and tail material special cooler air duct special gate is provided. The granulator head and tail material and slip material reprocessing system can ensure the complete separation of unqualified products and qualified products in the granulation process, and realizes effective cooling, crushing and recycling of unqualified products.

Description

Technical Field

[0001] This invention relates to automated feed processing technology, and in particular to a system for reprocessing head and tail materials and slippery materials from a pellet mill. Background Technology

[0002] Feed pelleting is a crucial step in feed production. During production, materials must first be conditioned to a specified temperature and humidity level, and then sterilized and matured before the pellets are produced as qualified products. If the temperature and humidity at the start of the pellet mill do not meet the process requirements, the pellets from the headstock are considered defective and need to be returned to the mill separately. Pellet from the tailstock, due to a sudden decrease in material causing a mismatch in process parameters, and the need for lubrication of the ring die, cannot be directly fed into the finished product. If the pellet mill slips, the process parameters change suddenly, the equipment malfunctions, and the product is also deemed defective and must be returned to the mill. Because pelleting is a continuous production process, the headstock, tailstock, and slipping material cannot enter the cooler in the normal production channel and must be processed separately. Currently, the headstock, tailstock, and slipping material are directly mixed with the powder to be pelleted, conditioned, and then pelleted.

[0003] However, the current methods for handling head and tail materials and slippery materials not only have many quality defects, but also cause significant damage to the equipment. The specific defects are as follows:

[0004] 1. Currently, most feed mills still use manual control for pelleting operations. The head and tail feeds as well as the slippery feeds must be manually removed and added to the same type of powder feed. This is labor-intensive, inefficient, and requires a lot of cleaning and sweeping work. There is also a lot of dust, resulting in a poor working environment and making 6S on-site management difficult.

[0005] 2. When the head, tail and slippery material particles are directly granulated for secondary pelleting, the vibration of the pellet mill and ring die increases and the current fluctuates greatly.

[0006] 3. When the head, tail and slippery material particles are directly granulated again, the particle hardness will increase sharply, the friction will increase, the material will carbonize and block the die holes, accelerate the wear of the ring die and pressure roller, and even cause the die to burst.

[0007] 4. When the head, tail, and slippery material granules are directly granulated again, the color of the pressed granules will be significantly different from that of other granules, resulting in mottled material and causing quality problems.

[0008] 5. When the head, tail and slippery material granules are directly granulated again, the moisture and temperature of the granules differ greatly from other materials, resulting in a large difference in the moisture content of the finished product. During cooling, local hot material and free water are easily generated, causing clumping and mold growth.

[0009] 6. Untreated waste materials have high temperatures and moisture content, making them very prone to clumping and mold growth during storage, which can lead to quality problems.

[0010] 7. If the material is not cooled, its high temperature and humidity, high viscosity, and tendency to adhere to the conveying equipment and channels will block the channels and easily cause mold, resulting in quality problems. Summary of the Invention

[0011] To address the technical problems in existing technologies, such as high workload, low efficiency, heavy cleaning and sweeping work, poor working environment, direct secondary granulation of head and tail materials and slippery materials, vibration of the granulator and ring die, and high viscosity of uncooled materials that easily adhere to conveying equipment and channels, causing blockages and mold growth, this invention proposes a reprocessing system for head and tail materials and slippery materials in granulators. This system ensures complete separation of defective and qualified products in the granulation process, automates the processing of defective products, significantly reduces the workload of granulation workers, and greatly improves work efficiency.

[0012] To achieve this goal, the present invention adopts the following technical solution.

[0013] A pellet mill head and tail material and slippery material reprocessing system includes a pellet mill bypass, a pellet mill discharge port tee, a head and tail material dedicated cooler, a head and tail material crusher, a granulator separator, and a control unit. The pellet mill bypass is a bypass pipe in the pellet mill controlled by a valve, and the outlet of the pellet mill bypass is connected to the pellet mill discharge port tee. The pellet mill discharge port tee has a two-way outlet structure, one of which is connected to the head and tail material dedicated cooler, which is connected to the head and tail material crusher. The crushed head and tail material and slippery material are processed and then enter the granulator separator.

[0014] In addition, the pellet mill head and tail material and slippery material reprocessing system of the present invention also includes a cooling material elevator and a cooling material tee. The cooling material elevator is located below the discharge port of the head and tail material crusher. The cooling material elevator lifts the head and tail material and slippery material crushed by the head and tail material crusher to the cooling material tee. The cooling material tee is a tee structure with two outlets, one of which is connected to the cyclone separator of the material to be pelletized.

[0015] In addition, in the pellet mill head and tail material and slippery material reprocessing system of the present invention, the outlet of the pellet mill separator includes two paths, which are respectively connected to the pellet mill hopper and the return hopper. The pellet mill hopper and the return hopper are hollow cuboids, and each has a hopper outlet at the bottom that is opened and closed by a hopper discharge gate. The control unit, according to the working state of the pellet mill, conveys the head material and slippery material after passing through the pellet mill bypass, the pellet mill discharge port tee, the head and tail material special cooler, the head and tail material crusher, and the pellet mill separator into the pellet mill hopper; and conveys the tail material after passing through the pellet mill bypass, the pellet mill discharge port tee, the head and tail material special cooler, the head and tail material crusher, and the pellet mill separator into the return hopper.

[0016] In addition, in the pellet mill head and tail material and slippage material reprocessing system of the present invention, the pellet mill bin and the return material bin are connected to the conditioner. The outlet of the conditioner is connected to the pellet mill or the pellet mill bypass. The outlet of the pellet mill is also connected to the pellet mill discharge port tee. The other path of the pellet mill discharge port tee is connected to the finished product cooler. The finished product cooler has a hollow cuboid structure with an inverted conical output section at the bottom. Below the outlet of the output section is a cooling material elevator. The cooling material elevator lifts the cooled finished product to the cooling material tee. The other path of the cooling material tee is connected to the finished product grading screen.

[0017] In addition, in the pellet mill head and tail material and slipping material reprocessing system of the present invention, the side wall of the finished product cooler has an exhaust port, which is connected to a scissor duct through an exhaust pipe for dust removal of the finished product entering the finished product cooler through the pellet mill discharge port tee; the scissor duct has a dust outlet below it, which is also located above the cooling material elevator.

[0018] In addition, the pellet mill head and tail material and slippage material reprocessing system of the present invention also includes a special gate connecting the finished product cooler and the head and tail material dedicated cooler air duct. The special gate connecting the finished product cooler and the head and tail material dedicated cooler air duct includes a three-way structure connecting the outlet air duct, the finished product cooler inlet air duct, and the head and tail material dedicated cooler inlet air duct. The three-way structure is connected to the outlet air duct through the outlet. The area where the three-way structure connects to the finished product cooler inlet air duct has a finished product cooler end air inlet, and the area where the three-way structure connects to the head and tail material dedicated cooler inlet air duct has a head and tail material cooler end air inlet. The air inlet at the cooler end is opened or closed by the air inlet valve at the finished product cooler end, and the air inlet at the head and tail material dedicated cooler end is opened or closed by the air inlet valve at the head and tail material dedicated cooler end. Among them, the air inlet valve at the finished product cooler end and the air inlet valve at the head and tail material dedicated cooler end are linked structures, which are used to switch between three states of the pellet mill cooler: the air inlet at the head and tail material dedicated cooler end is open while the air inlet at the finished product cooler end is closed; the air inlet at the head and tail material dedicated cooler end is closed while the air inlet at the finished product cooler end is open; and the air inlet at the head and tail material dedicated cooler end and the air inlet at the finished product cooler end are both open.

[0019] Furthermore, in the pellet mill head and tail material and slippage material reprocessing system of the present invention, in the special gate connecting the finished product cooler and the head and tail material special cooler air duct, the linkage structure of the finished product cooler end air inlet valve and the head and tail material special cooler end air inlet valve includes a rotating shaft that simultaneously connects one end of the finished product cooler end air inlet valve and the head and tail material special cooler end air inlet valve, a cylinder and a crank are set on the outer wall of the special gate connecting the finished product cooler and the head and tail material special cooler air duct; the cylinder has a cylinder body and a piston, the cylinder body has an open end and a closed end; the piston has a moving end and an extending end, the moving end of the piston is located inside the cylinder body and is propelled or pulled back by the gas inside the cylinder body, and the extending end of the piston extends through the cylinder body having an open end; the closed end of the cylinder body is connected to... The piston is hinged to the outer wall of the pellet mill cooler. The extended end of the piston is connected to one end of the crank via the hinge, and the other end of the crank is fixedly connected to the rotating shaft. When the moving end of the piston is pulled back to the first position in the cylinder, the crank pulls the rotating shaft back to the state where the air inlet of the head and tail material cooler is open and the air inlet of the finished product cooler is closed. When the moving end of the piston is pushed into the second position in the cylinder, the crank pushes the rotating shaft to the state where the air inlet of the head and tail material cooler is closed and the air inlet of the finished product cooler is open. When the moving end of the piston is in the third position between the first and second positions in the cylinder, the crank pushes the rotating shaft to the state where the air inlet of the head and tail material cooler and the air inlet of the finished product cooler are opened simultaneously.

[0020] In addition, in the pellet mill head and tail material and slipping material reprocessing system of the present invention, in the special gate connecting the air duct of the pellet mill finished product cooler and the head and tail material special cooler, the shape of the air inlet valve at the end of the finished product cooler and the air inlet valve at the end of the head and tail material special cooler are rectangular, and the shape of the air inlet at the end of the head and tail material special cooler and the air inlet at the end of the finished product cooler are also rectangular; the cross sections of the air inlet valve at the end of the finished product cooler, the air inlet valve at the end of the head and tail material special cooler, the air inlet at the end of the head and tail material special cooler and the air inlet at the end of the finished product cooler are connected by a tapered fit, and the tapered outer edge of the air inlet valve at the end of the finished product cooler and the air inlet valve at the end of the head and tail material special cooler has a sealing gasket.

[0021] The technical effects of the pellet mill head and tail material and slippery material reprocessing system of the present invention include the following.

[0022] 1. The pellet mill head and tail material and slippery material reprocessing system of the present invention employs multiple material passages and two cooling systems to cool the finished product and the head, tail, and slippery materials respectively, thus achieving complete separation of qualified and unqualified products. This significantly improves the qualification rate of the finished product.

[0023] 2. The pellet mill head and tail material and slippery material reprocessing system of the present invention cools and crushes all high-temperature and high-humidity head material, tail material and slippery material in a timely manner, reducing the stickiness of the material and preventing it from adhering to the conveying equipment and channels.

[0024] 3. In addition, the pellet mill head and tail material and slippery material reprocessing system of the present invention cools and crushes all the high temperature and high humidity head material, tail material and slippery material in a timely manner, so as to avoid quality problems such as hard particles, black material, mottled material, large moisture difference, mold and deterioration.

[0025] 4. The pellet mill head and tail material and slippery material reprocessing system of the present invention can realize fully automatic classification operation by using the control unit. Different processing methods are adopted for head material, tail material and slippery material. The materials run in a closed system in the equipment, which improves the management of the pellet mill site.

[0026] 5. In the pellet mill head and tail material and slippery material reprocessing system of the present invention, the processing of head material, tail material and slippery material is all automatically controlled by computer and completed by the equipment, eliminating the workload of manual operation and improving the work efficiency of the pelleting process.

[0027] 6. The pellet mill head and tail material and slipping material reprocessing system of the present invention specifically includes a special gate connecting the air duct of the pellet mill finished product cooler and the head and tail material special cooler. In its three-way structure, the opening and closing signals of the air inlet valve at the finished product cooler end and the air inlet valve at the head and tail material special cooler end are linked, and an automatic control mode can be formed by using a control unit, without the need for manual operation.

[0028] 7. In the pellet mill head and tail material and slipping material reprocessing system of the present invention, a special gate is connected between the finished product cooler and the head and tail material special cooler air duct. The cross-sections of the finished product cooler end air inlet valve, the head and tail material special cooler end air inlet valve, the head and tail material special cooler end air inlet and the finished product cooler end air inlet are connected by a tapered fit. The tapered outer edge of the finished product cooler end air inlet valve and the head and tail material special cooler end air inlet valve has a sealing gasket, thus ensuring that the air duct is airtight and leak-proof when closed.

[0029] 8. In the pellet mill head and tail material and slippery material reprocessing system of the present invention, when the pellet mill cooler is in the state where the air inlet of the head and tail material special cooler end and the air inlet of the finished product cooler end are open at the same time, both gates are connected to the air passage outside, thereby keeping the air pressure inside and outside the two gates equal, the equipment is subjected to balanced force, and it is easy to control.

[0030] 9. In the pellet mill head and tail material and slippery material reprocessing system of the present invention, the dedicated gate connecting the pellet mill finished product cooler and the head and tail material dedicated cooler air duct makes the new process of separately cooling and crushing the pellet mill head and tail material and slippery material simple and feasible, greatly reducing the space and workload required for installation, and also greatly reducing the investment.

[0031] 10. In the pellet mill head and tail material and slipping material reprocessing system of the present invention, the dedicated gate connecting the finished product cooler and the head and tail material dedicated cooler air duct effectively utilizes the idle time period of the finished product cooling air network when the pellet mill is started to cool the material in the head and tail material dedicated cooler, without affecting the normal operation of the finished product cooler and ensuring the continuity of production. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the pellet mill head and tail material and slipping material reprocessing system in a specific embodiment of the present invention.

[0033] Figure 2 This is a partial structural diagram of the pellet mill head and tail material and slippery material reprocessing system in a specific embodiment of the present invention.

[0034] Figure 3 This is a partial structural diagram of the pellet mill head and tail material and slippery material reprocessing system in a specific embodiment of the present invention.

[0035] Figure 4 This is a top view of the three-way structure in the special gate connecting the duct of the pellet mill finished product cooler and the head and tail material special cooler in the pellet mill head and tail material heavy processing system in a specific embodiment of the present invention.

[0036] Figure 5 This is a right-side view of the three-way structure in the special gate connecting the duct of the pellet mill finished product cooler and the head and tail material special cooler in the pellet mill head and tail material heavy processing system in a specific embodiment of the present invention.

[0037] Figure 6 This is a front view schematic diagram of the three-way structure in the special gate connecting the air duct of the pellet mill finished product cooler and the head and tail material special cooler in the pellet mill head and tail material heavy processing system in a specific embodiment of the present invention.

[0038] Figure 7 This is a schematic diagram illustrating the working principle of the dedicated gate connecting the finished product cooler and the head and tail material cooler in the pellet mill head and tail material reprocessing system in a specific embodiment of the present invention. The cooling air network is in a state where the air inlet of the head and tail material cooler is open and the air inlet of the finished product cooler is closed.

[0039] Figure 8This is a schematic diagram of the working principle of the special gate connecting the duct of the pellet mill finished product cooler and the head and tail material special cooler in the pellet mill head and tail material heavy processing system in a specific embodiment of the present invention. The cooling air network is in a state where the air inlet of the head and tail material special cooler is closed and the air inlet of the finished product cooler is open.

[0040] Figure 9 This is a schematic diagram illustrating the working principle of the dedicated gate connecting the finished product cooler and the head and tail material cooler in the pellet mill head and tail material reprocessing system in a specific embodiment of the present invention. The cooling air network is in a state where the air inlet of the head and tail material cooler and the air inlet of the finished product cooler are both open. Detailed Implementation

[0041] The present invention will now be described in detail with reference to the accompanying drawings.

[0042] The following includes detailed exemplary embodiments. However, the specific structural and functional details herein are for illustrative purposes only.

[0043] However, it should be understood that the present invention is not limited to the specific exemplary embodiments, but covers all modifications, equivalents, and substitutions falling within the scope of the present invention. Throughout the description of the drawings, the same reference numerals denote the same elements.

[0044] Referring to the accompanying drawings, the structures, proportions, sizes, etc., depicted in the drawings are merely for illustrative purposes to aid those skilled in the art in understanding and reading the content disclosed herein. They are not intended to limit the conditions under which the invention can be implemented and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the positional limitations used in this specification are merely for clarity of description and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0045] Figure 1 This is a schematic diagram of the overall structure of the pellet mill head and tail material and slipping material reprocessing system in a specific embodiment of the present invention. Figure 2 This is a partial structural diagram of the pellet mill head and tail material and slippery material reprocessing system in a specific embodiment of the present invention. Figure 3 This is a partial structural diagram of the pellet mill head and tail material and slippery material reprocessing system in a specific embodiment of the present invention. Figures 1-3 The schematic diagram of the labels in the attached figures is shown below.

[0046] 101 pelleting silo

[0047] 102 return hopper,

[0048] 103 hopper discharge gate,

[0049] 104 granulator buffer hopper

[0050] 105 conditioner,

[0051] 106 granulator bypass,

[0052] 107 pellet mill

[0053] 108 pellet mill feed port tee

[0054] 109 Finished Product Cooler

[0055] 110 Shakron

[0056] 111 Head and tail material special cooler air duct special gate,

[0057] 112 Head and tail material dedicated cooler,

[0058] 113 Head and tail material crusher,

[0059] 114 Cooling Material Elevator

[0060] 115 Coolant Tee

[0061] 116 Finished Material Grading Screen

[0062] 117 Granulation separator for granules to be processed.

[0063] As shown in the figure, the specific embodiment of the present invention includes a pellet mill head and tail material and slippery material reprocessing system, including a pellet mill bypass 106, a pellet mill discharge port tee 108, a head and tail material dedicated cooler 112, a head and tail material crusher 113, a granulator separator 117, and a control unit. The pellet mill bypass 106 is a bypass pipe in the pellet mill 107 controlled by a valve, and the outlet of the pellet mill bypass 106 is connected to the pellet mill discharge port tee 108. The pellet mill discharge port tee 108 is a tee structure with two outlets, one of which is connected to the head and tail material dedicated cooler 112. The head and tail material dedicated cooler 112 has a head and tail material dedicated cooler air duct gate 111 above it. The head and tail material dedicated cooler 112 is connected to the head and tail material crusher 113. The head and tail material and slippery material crushed by the head and tail material crusher 113 are processed and then enter the granulator separator 117.

[0064] In addition, the pellet mill head and tail material and slippery material reprocessing system of the specific embodiment of the present invention also includes a cooling material elevator 114 and a cooling material tee 115. The cooling material elevator 114 is located below the discharge port of the head and tail material crusher 113. The cooling material elevator 114 lifts the head material, tail material and slippery material crushed by the head and tail material crusher 113 to the cooling material tee 115. The cooling material tee 115 is a tee structure with two outlets, one of which is connected to the granulation material separator 117.

[0065] In addition, in the pellet mill head and tail material and slippery material reprocessing system of the specific embodiment of the present invention, the outlet of the granulator separator 117 includes two paths, which are respectively connected to the pelleting bin 101 and the return bin 102. The pelleting bin 101 and the return bin 102 are hollow cuboids, and each has a bin outlet at the bottom that is opened and closed by the bin outlet gate 103. The control unit, according to the working state of the pellet mill 107, conveys the head material and slippery material after passing through the pellet mill bypass 106, the pellet mill discharge port tee 108, the head and tail material special cooler 112, the head and tail material crusher 113, and the granulator separator 117 into the pelleting bin 101; and conveys the tail material after passing through the pellet mill bypass 106, the pellet mill discharge port tee 108, the head and tail material special cooler 112, the head and tail material crusher 113, and the granulator separator 117 into the return bin.

[0066] Specifically, the working principle of the pellet mill head and tail material and slippery material reprocessing system of the specific embodiment of the present invention is as follows.

[0067] The head and tail materials include head material and tail material. Head material refers to the powder and granules produced at the beginning of the pelleting process when the moisture and temperature of the material have not met the pelleting requirements. Head material cannot enter the finished product cooler 109. The material process flow is as follows: (Pelletizing hopper 101 → hopper discharge gate 103 → pelletizer buffer hopper 104 → conditioner 105 → pelletizer bypass 106 → pelletizer 107 → pelletizer discharge port tee 108 → head and tail material dedicated cooler 112 → head and tail material crusher 113 → cooled material elevator 114 → cooled material tee 115 → material separator 117 → pelletizing hopper 101). In this process: (1) When the temperature and humidity of the powder do not meet the requirements for granulation, the head material is directly introduced into the head and tail material cooler 112 for cooling through the bypass 106 and the tee 108; (2) The cooled granules are immediately crushed by the head and tail material crusher 113; (3) The crushed material is introduced into the granulation chamber 101, which is being granulated, through the cooling material elevator 114, the cooling material tee 115, and the granulation material separator 117 for regranulation.

[0068] The term "tail material" refers to the final stage of pelleting. Since the total amount of tail material is small, some oil needs to be added to wash the mold, and steam input needs to be reduced promptly. Pellets produced at this stage are substandard and cannot be mixed into the finished product. The material processing flow is as follows: (Pelletizing hopper 101 → hopper discharge gate 103 → pelletizer buffer hopper 104 → conditioner 105 → pelletizer bypass 106 → pelletizer 107 → pelletizer discharge tee 108 → head and tail material cooler 112 → head and tail material crusher 113 → cooled material elevator 114 → cooled material tee 115 → material separator 117 → return hopper 102). In this process, (1) the extruded granules are fed into the head and tail material cooler 112 through the granulator feed port tee 108 for cooling; (2) the cooled granules are immediately crushed by the head and tail material crusher 113; (3) the crushed material is fed into the return hopper 102 through the cooling material elevator 114, the cooling material tee 115, and the granulation material separator 117, and added in small batches to other similar products for the next process.

[0069] For slipping materials, when slippage occurs in pellet mill 107, the material process flow is as follows: (pellet hopper 101 → hopper discharge gate 103 → pellet mill buffer hopper 104 → conditioner 105 → pellet mill bypass 106 → pellet mill 107 → pellet mill discharge port tee 108 → head and tail material special cooler 112 → head and tail material crusher 113 → cooled material elevator 114 → cooled material tee 115 → material to be pelletized rotary separator 117 → pellet hopper 101). In this process: (1) When the pellet mill 107 slips, the pellet mill bypass 106 automatically discharges the material directly and no longer enters the pelleting chamber of the pellet mill 107. The material is then introduced into the head and tail material cooler 112 through the pellet mill discharge port tee 108, while the pellet mill feeding auger and steam are turned off; (2) The bypass 106 is automatically started, and a small amount of material is introduced into the pelleting chamber of the pellet mill 107. After the slippage does not occur again, the feeding auger and steam are slowly turned on. After the pellet mill runs smoothly, the bypass 106 introduces the material into the pelleting chamber. During the process, all materials pass through the head and tail material cooler 112; (3) The cooled pellets are immediately crushed by the head and tail material crusher 113; (4) The crushed material is introduced into the pelleting chamber 101, which is being pelletized, through the cooling material elevator 114, the cooling material tee 115, and the pelleting material separator 117 for re-granulation.

[0070] In addition, in the pellet mill head and tail material and slippage material reprocessing system of the specific embodiment of the present invention, the pelleting bin 101 and the return bin 102 are connected to the conditioner 105. The outlet of the conditioner 105 is connected to the pellet mill 107 or the pellet mill bypass 106. The outlet of the pellet mill 107 is also connected to the pellet mill discharge port tee 108. The other path of the pellet mill discharge port tee 108 is connected to the finished product cooler 109. The finished product cooler 109 has a hollow barrel structure with an inverted cone-shaped output section at the bottom. Below the outlet of the output section is the cooling material elevator 114. The cooling material elevator 114 lifts the cooled finished product to the cooling material tee 115. The other path of the cooling material tee 115 is connected to the finished product grading screen 116. After screening, the pelleted finished product is formed.

[0071] In addition, in the pellet mill head and tail material and slippage material handling system of the specific embodiment of the present invention, the upper side wall of the finished product cooler 109 has an exhaust port, which is connected to the cyclone 110 through an exhaust pipe for cooling the finished product entering the finished product cooler 109 through the pellet mill discharge port tee 108; the cyclone 110 has a dust outlet below it, which is also located above the cooling material elevator 114.

[0072] In a specific embodiment of the present invention, two coolers are involved: a finished product cooler 109 and a head and tail material cooler 112. The finished product cooler 109 is used to cool qualified pellets, while the head and tail material cooler 112 cools the head, tail, and slippery materials. If the finished product cooler 109 and the head and tail material cooler 112 are designed with their own separate air ducts, the isolated air ducts would result in the present invention's pellet mill head, tail, and slippery material reprocessing system occupying a large area and incurring high costs.

[0073] Therefore, the present invention also discloses a special gate 121 for connecting the air duct of the pellet mill finished product cooler and the head and tail material special cooler in the pellet mill head and tail material heavy processing system.

[0074] Figure 4 This is a schematic diagram of the working principle of the special gate 121 connecting the finished product cooler and the head and tail material cooler of the present invention, wherein the granulator cooler is in a state where the air inlet of the head and tail material cooler is open and the air inlet of the finished product cooler is closed. Figure 5 This is a schematic diagram of the working principle of the special gate connecting the finished product cooler and the head and tail material cooler of the present invention, wherein the air inlet of the pellet mill cooler is closed at the head and tail material cooler end and the air inlet of the finished product cooler end is open. Figure 6This is a schematic diagram illustrating the working principle of the special gate connecting the finished product cooler and the head and tail material cooler of the granulator. The granulator cooler is in a state where the air inlet of the head and tail material cooler and the air inlet of the finished product cooler are both open.

[0075] As shown in the figure, the special gate 121 connecting the finished product cooler and the head and tail material special cooler of the pellet mill of the present invention includes a three-way structure connecting the air outlet duct, the finished product cooler inlet duct, and the head and tail material special cooler inlet duct; the three-way structure is connected to the air outlet duct through the air outlet 1211, and the area where the three-way structure is connected to the finished product cooler inlet duct has a finished product cooler end air inlet 1212, and the area where the three-way structure is connected to the head and tail material special cooler inlet duct has a head and tail material special cooler end air inlet 1214; the finished product cooler end air inlet 1212 is opened or closed by the finished product cooler end air inlet valve 1213, and the head and tail material special cooler inlet duct is connected to the head and tail material special cooler inlet duct. The air inlet 1214 of the special cooler for raw materials is opened or closed by the air inlet valve 1215 of the special cooler for head and tail materials. The air inlet valve 1213 of the finished product cooler and the air inlet valve 1215 of the special cooler for head and tail materials are linked to switch between three states: the air inlet 1214 of the special cooler for head and tail materials is open while the air inlet 1212 of the finished product cooler is closed; the air inlet 1214 of the special cooler for head and tail materials is closed while the air inlet 1212 of the finished product cooler is open; and the air inlet 1214 of the special cooler for head and tail materials and the air inlet 1212 of the finished product cooler are both open.

[0076] Figure 7 This is a schematic diagram illustrating the working principle of the dedicated gate connecting the finished product cooler and the head and tail material cooler in the pellet mill head and tail material reprocessing system in a specific embodiment of the present invention. The cooling air network is in a state where the air inlet of the head and tail material cooler is open and the air inlet of the finished product cooler is closed. Figure 8 This is a schematic diagram of the working principle of the special gate connecting the duct of the pellet mill finished product cooler and the head and tail material special cooler in the pellet mill head and tail material heavy processing system in a specific embodiment of the present invention. The cooling air network is in a state where the air inlet of the head and tail material special cooler is closed and the air inlet of the finished product cooler is open. Figure 9 This is a schematic diagram illustrating the working principle of the dedicated gate connecting the finished product cooler and the head and tail material cooler in the pellet mill head and tail material reprocessing system in a specific embodiment of the present invention. The cooling air network is in a state where the air inlet of the head and tail material cooler and the air inlet of the finished product cooler are both open.

[0077] In the existing technology, during the start-up phase of the pellet mill, no material is fed into the finished product cooler 109, and its cooling air network is idle or running idly. If the head and tail material dedicated cooler 112 requires a separate cooling air network, it is expensive, occupies more space and area, and the air network operates for relatively little time, resulting in low utilization and uneconomical operation. In addition, if the cooling air duct of the head and tail material dedicated cooler 112 is directly connected to the cooling air duct of the finished product cooler 109, without an automatically controlled switching gate, air leakage will occur at the interface, affecting the performance of the finished product cooler and increasing energy consumption. Manual operation would increase workload, be cumbersome, and inconvenient to implement.

[0078] To solve these problems, the present invention adopts a linkage structure of the air inlet valve 1213 at the end of the finished product cooler and the air inlet valve 1215 at the end of the head and tail material special cooler. Accordingly, the working principle of the special gate 121 connecting the finished product cooler and the head and tail material special cooler air duct of the pellet mill is as follows.

[0079] 1. When the pellet mill is started, the cooling air network is started and running. The linkage structure of the air inlet valve 1213 at the end of the finished product cooler 109 and the air inlet valve 1215 at the end of the head and tail material special cooler automatically keeps the air inlet valve 1213 at the end of the finished product cooler closed and the air inlet valve 1215 at the end of the head and tail material special cooler 112 open. The material is introduced into the head and tail material special cooler 112, and the cooling air network cools the material in the head and tail material special cooler 112.

[0080] 2. When the temperature, moisture content, and appearance of the granulated material meet the quality control requirements, the material is introduced into the finished product cooler 109. The linkage structure of the air inlet valve 1213 at the end of the finished product cooler 109 and the air inlet valve 1215 at the end of the head and tail material special cooler 112 automatically controls the stroke control of the cylinder 1216 to the middle position. The gates of the air inlet duct of the finished product cooler 109 and the air inlet duct of the head and tail material special cooler 121—the air inlet valves 1213 and 1215 at the end of the finished product cooler and the head and tail material special cooler—are both in a half-open state, and the inside and outside of the two gates are connected, with equal air pressure on both gates. The cooling air network of the pellet mill cooler can effectively cool the material in both the finished product cooler 109 and the head and tail material special cooler 112.

[0081] 3. When the material in the head and tail material special cooler 112 has been cooled, the linkage structure of the finished product cooler end air inlet valve 1213 and the head and tail material special cooler end air inlet valve 1215 automatically closes the head and tail material special cooler end air inlet valve 1215, while the finished product cooler end air inlet valve 1213 is fully opened, and the cooling air network of the pellet mill cooler only cools the material in the head finished product cooler 109.

[0082] Additionally, as shown in the figure, in the special gate connecting the finished product cooler and the head and tail material cooler of the pellet mill in a specific embodiment of the present invention, the linkage structure of the finished product cooler end air inlet valve 1213 and the head and tail material cooler end air inlet valve 1215 includes a rotating shaft that simultaneously connects one end of the finished product cooler end air inlet valve 1213 and the head and tail material cooler end air inlet valve 1215, a cylinder 1216 and a crank disposed on the outer wall of the special gate 121 connecting the finished product cooler and the head and tail material cooler; the cylinder 1216 has a cylinder body and a piston, the cylinder body has an open end and a closed end; the piston has a moving end and an extending end, the moving end of the piston is located inside the cylinder body and is propelled or pulled back by the gas inside the cylinder body, and the extending end of the piston extends through the open end of the cylinder body; the closed end of the cylinder body of the cylinder 1216 is connected to the outside of the special gate 121 connecting the finished product cooler and the head and tail material cooler via a hinge. On the wall, the piston's extended end is connected to one end of the crank via a hinge, and the other end of the crank is fixedly connected to the rotating shaft. When the piston's moving end is pulled back to the first position in the cylinder (i.e., retracted to the innermost position), the crank pulls the rotating shaft back to the state where the air inlet 1214 of the head and tail material cooler is open and the air inlet 1212 of the finished product cooler is closed. When the piston's moving end is pushed into the second position in the cylinder (i.e., extended to the outermost position), the crank pushes the rotating shaft to the state where the air inlet 1214 of the head and tail material cooler is closed and the air inlet 1212 of the finished product cooler is open. When the piston's moving end is in the third position between the first and second positions in the cylinder (the middle position between the innermost and outermost positions), the crank pushes the rotating shaft to the state where the air inlet 1214 of the head and tail material cooler and the air inlet 1212 of the finished product cooler are opened simultaneously.

[0083] In addition, in the special gate 121 connecting the finished product cooler and the head and tail material special cooler air duct of the pellet mill in a specific embodiment of the present invention, the finished product cooler end air inlet valve 1213 and the head and tail material special cooler end air inlet valve 1215 are circular in shape, and the head and tail material special cooler end air inlet 1214 and the finished product cooler end air inlet 1212 are also circular in shape; the cross sections of the finished product cooler end air inlet valve 1213, the head and tail material special cooler end air inlet valve 1215, the head and tail material special cooler end air inlet 1214 and the finished product cooler end air inlet 1212 are connected by a tapered fit, and the tapered outer edge of the finished product cooler end air inlet valve and the head and tail material cooler end air inlet valve has a sealing gasket.

[0084] Therefore, the technical effects of the pellet mill head and tail material and slipping material reprocessing system of the specific embodiments of the present invention include the following.

[0085] 1. The pellet mill head and tail material and slippage material reprocessing system of the present invention ensures complete separation between defective products and qualified products during the production process, significantly improving the qualification rate of finished products.

[0086] 2. The pellet mill head and tail material and slippery material reprocessing system of the present invention cools and crushes all high-temperature and high-humidity head material, tail material and slippery material in a timely manner, reducing the stickiness of the material and preventing it from adhering to the conveying equipment and channels.

[0087] 3. In addition, the pellet mill head and tail material and slippery material reprocessing system of the present invention cools and crushes all the high temperature and high humidity head material, tail material and slippery material in a timely manner, so as to avoid quality problems such as hard particles, black material, mottled material, large moisture difference, mold and deterioration.

[0088] 4. The pellet mill head and tail material and slippery material reprocessing system of the present invention can realize fully automatic classification operation by using the control unit. Different processing methods are adopted for head material, tail material and slippery material. The materials run in a closed system in the equipment, which improves the management of the pellet mill site.

[0089] 5. In the pellet mill head and tail material and slippery material reprocessing system of the present invention, the processing of head material, tail material and slippery material is all automatically controlled by computer and completed by the equipment, eliminating the workload of manual operation and improving the work efficiency of the pelleting process.

[0090] 6. The pellet mill head and tail material and slipping material reprocessing system of the present invention specifically includes a special gate connecting the air duct of the pellet mill finished product cooler and the head and tail material special cooler. In its three-way structure, the opening and closing signals of the air inlet valve at the finished product cooler end and the air inlet valve at the head and tail material special cooler end are linked, and an automatic control mode can be formed by using a control unit, without the need for manual operation.

[0091] 7. In the pellet mill head and tail material and slipping material reprocessing system of the present invention, a special gate is connected between the finished product cooler and the head and tail material special cooler air duct. The cross-sections of the finished product cooler end air inlet valve, the head and tail material special cooler end air inlet valve, the head and tail material special cooler end air inlet and the finished product cooler end air inlet are connected by a tapered fit. The tapered outer edge of the finished product cooler end air inlet valve and the head and tail material special cooler end air inlet valve has a sealing gasket, thus ensuring that the air duct is airtight and leak-proof when closed.

[0092] 8. In the pellet mill head and tail material and slippery material reprocessing system of the present invention, when the pellet mill cooler is in the state where the air inlet of the head and tail material special cooler end and the air inlet of the finished product cooler end are open at the same time, both gates are connected to the air passage outside, thereby keeping the air pressure inside and outside the two gates equal, the equipment is subjected to balanced force, and it is easy to control.

[0093] 9. In the pellet mill head and tail material and slippery material reprocessing system of the present invention, the dedicated gate connecting the pellet mill finished product cooler and the head and tail material dedicated cooler air duct makes the new process of separately cooling and crushing the pellet mill head and tail material and slippery material simple and feasible, greatly reducing the space and workload required for installation, and also greatly reducing the investment.

[0094] 10. In the pellet mill head and tail material and slipping material reprocessing system of the present invention, the dedicated gate connecting the finished product cooler and the head and tail material dedicated cooler air duct effectively utilizes the idle time period of the finished product cooling air network when the pellet mill is started to cool the material in the head and tail material dedicated cooler, without affecting the normal operation of the finished product cooler and ensuring the continuity of production.

[0095] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as mentioned above, it should be understood that the present invention is not limited to the forms disclosed in this specification and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described in this specification through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A system for reprocessing head and tail materials and slipping materials from a pellet mill, characterized in that, The device comprises a granulator bypass, a granulator discharge three-way pipe, a head and tail material special cooler, a head and tail material crusher, a granulation material rotary separator and a control unit, wherein the granulator bypass is a bypass pipeline in the granulator controlled by a valve, and the outlet of the granulator bypass is connected to the granulator discharge three-way pipe; the granulator discharge three-way pipe is a three-way structure with two outlets, one of which is connected to the head and tail material special cooler, and the head and tail material special cooler is connected to the head and tail material crusher; the head and tail material crushed by the head and tail material crusher and the slipping material are processed and then enter the granulation material rotary separator; The device also comprises a granulation bin, a return material bin, a conditioner and a finished product cooler, the granulation bin and the return material bin are jointly connected to the conditioner, the outlet of the conditioner is connected to the granulator or the granulator bypass, the outlet of the granulator is also connected to the granulator discharge three-way pipe, the other outlet of the granulator discharge three-way pipe is connected to the finished product cooler, the finished product cooler has a hollow cuboid structure, and a downwardly tapered output portion at the bottom, and a cooling material elevator below the outlet of the output portion, the cooling material elevator lifts the cooled finished product to a cooling material three-way pipe, and the other outlet of the cooling material three-way pipe is connected to a finished product material grading screen; The finished product cooler has an air extraction port above the side wall, which is connected to a Jiekelong through an air extraction pipeline, for dust removal treatment of the finished product entering the finished product cooler through the granulator discharge three-way pipe; the Jiekelong has a dust outlet below, which is also above the cooling material elevator; The device also comprises a finished product cooler and head and tail material special cooler air duct connection special gate, which comprises a three-way structure connecting the air outlet duct, the finished product cooler air inlet duct and the head and tail material special cooler air inlet duct; the three-way structure is connected to the air outlet duct through an air outlet, and the three-way structure has a finished product cooler end air inlet in the connection area with the finished product cooler air inlet duct and a head and tail material special cooler end air inlet in the connection area with the head and tail material special cooler air inlet duct; the finished product cooler end air inlet is opened or closed by a finished product cooler end air inlet valve, and the head and tail material special cooler end air inlet is opened or closed by a head and tail material special cooler end air inlet valve; wherein the finished product cooler end air inlet valve and the head and tail material cooler end air inlet valve are a linkage structure, for switching among three states that the head and tail material special cooler end air inlet is opened and the finished product cooler end air inlet is closed, the head and tail material special cooler end air inlet is closed and the finished product cooler end air inlet is opened, and the head and tail material special cooler end air inlet and the finished product cooler end air inlet are both opened. The linkage structure of the end air inlet valve of the product cooler and the end air inlet valve of the head and tail material special cooler in the special gate for connecting the air duct of the product cooler and the air duct of the head and tail material special cooler comprises a rotating shaft connected to one end of the end air inlet valve of the product cooler and the end air inlet valve of the head and tail material special cooler, a cylinder arranged on the outer wall of the special gate for connecting the air duct of the product cooler and the air duct of the head and tail material special cooler, and a crank.

2. The system of claim 1, wherein the system further comprises a second conveyor configured to receive the head and tail material and the slip material from the first conveyor and to convey the head and tail material and the slip material to the reprocessing system. The cooling material elevator is located below the discharge port of the head and tail material crusher, and the cooling material elevator lifts the head and tail material and the skid material crushed by the head and tail material crusher to the cooling material tee joint, and the cooling material tee joint is a tee joint structure with two outlets, one of which is connected to the granulation material rotary distributor.

3. The system of claim 2, wherein the system further comprises a second conveyor configured to receive the head and tail material and the slip material from the first conveyor and to convey the head and tail material and the slip material to the reprocessing system. The outlet of the granulation material rotary distributor comprises two paths connected to the granulation bin and the return bin, and the granulation bin and the return bin are hollow rectangular boxes, each of which has a bin discharge port opened and closed by a bin discharge gate at the bottom.

4. The system of claim 1, wherein the system further comprises a head-tail material and slip material reprocessing system. The shape of the end air inlet valve of the product cooler and the end air inlet valve of the head and tail material special cooler in the special gate for connecting the air duct of the product cooler and the air duct of the head and tail material special cooler is rectangular, and the shape of the end air inlet of the head and tail material special cooler and the end air inlet of the product cooler is also rectangular. The cross section of the end air inlet valve of the product cooler, the end air inlet valve of the head and tail material special cooler, the end air inlet of the head and tail material special cooler and the end air inlet of the product cooler adopts a tapered fitting connection, and the tapered outer edge of the end air inlet valve of the product cooler and the end air inlet valve of the head and tail material special cooler has a sealing gasket.

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