Hot air surrounding slow baking equipment for pet food processing and three-section baking method

Abstract

The invention relates to the technical field of pet food processing, and discloses surrounding hot air slow drying equipment for pet food processing and a three-section type baking method.The surrounding hot air slow drying equipment for pet food processing comprises a drying box, a hot air drying unit is installed at the bottom in the drying box, and a circulating conveying unit is installed in the drying box; a plurality of drying frames are evenly distributed on the circulating conveying unit, material overturning mechanisms are arranged in the drying frames, positioning assemblies are installed in the drying box, and the material overturning mechanisms and the positioning assemblies are matched to be used for overturning raw materials in the drying frames. Food particles on the drying frame are turned over by moving a turning plate in the drying frame, meanwhile, an arc-shaped plate and a second fixing plate are matched to enable the food particles to be scattered in an S shape, damage to the food particles is avoided, meanwhile, the contact face of the food particles and hot air is replaced, and the drying effect is improved while the pet food yield is increased; through the three-stage baking process, the gelatinization degree of the baked grain starch of the pet food can be increased to 90% or above, and digestion and absorption are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of pet food processing, and in particular to a surrounding hot air slow baking device and a three-stage baking method for pet food processing. Background Art

[0002] Pet food is food specially provided for pets and small animals. Its main function is to provide the most basic nutrients required for life guarantee, growth and health for various pets. During the processing of meat pet food, the meat needs to be rolled into particles and then dried to make it dehydrated and crispy.

[0003] During the drying process of meat pet food, food particles are placed in the cylinder of the drying equipment, and the food particles are turned over by the internal turning mechanism and contacted with hot air to achieve dehydration and drying. For example, the patent with the prior art announcement number CN117647079A discloses an aseptic drying equipment for pet food processing, which stirs the pet food raw materials on the inner wall of the drying cylinder through multiple hollow plates to promote the tumbling of the static pet food raw materials to avoid mutual condensation. Through the setting of the feeding holes, part of the pet food raw materials can pass through the hollow plates, and air holes are set on the outer sides of the multiple hollow plates so that the hot air flow is directly discharged into the interior of the pet food raw materials, thereby releasing heat from the interior of the pet food raw materials.

[0004] However, the prior art still has the following defects: when the pet food raw materials are stirred, the raw materials at the corners are easily broken by the friction and extrusion between the hollow plate and the cylinder, and the pet food raw materials will fall from a high place many times. The impact generated when falling can easily cause the raw materials to break and produce debris, thereby reducing the yield and production quality of pet food. Summary of the invention

[0005] In view of the problem in the prior art that pet food particles are broken during the stirring process, a surrounding hot air slow drying device for pet food processing is proposed.

[0006] The purpose is to flip the food particles on the baking frame by the translation of the flipping plate, and combine the reciprocating motion of the adjustment plate to make the food particles spread in an S shape, thereby avoiding damage to the food particles and improving the drying effect.

[0007] The technical solution of the present invention is a surrounding hot air slow drying device for processing pet food, comprising a drying box, a hot air drying unit is installed at the bottom of the drying box, a circulating conveying unit is installed in the drying box, a plurality of drying frames are evenly distributed on the circulating conveying unit, a turning mechanism is arranged in the drying frame, a positioning assembly is installed in the drying box, and the turning mechanism cooperates with the positioning assembly to turn over the food particles in the drying frame; The material turning mechanism includes a material turning module and a driving module. The material turning module includes a material turning plate that is slidably matched with the drying frame. The cross section of the material turning plate is an isosceles triangle structure. A direction adjustment plate is arranged on the top of the material turning plate. The driving module is arranged in the material turning plate to drive the direction adjustment plate to move back and forth. The positioning assembly includes a positioning rod elastically connected to the drying box, the driving module abuts against the positioning rod, and the positioning assembly also includes a trapezoidal block arranged at the corner of the drying frame, and the trapezoidal block is in sliding contact with the positioning rod.

[0008] By adopting the above technical scheme, the product particles are spread on the baking frame, the circulating conveying unit drives each baking frame to perform a circulating motion, the hot air drying unit generates hot air in the drying box, and the hot air removes moisture from the product particles when passing through the baking frame. Whenever the baking frame moves to the vicinity of the positioning component, the driving module abuts against the positioning rod to keep the flipping plate stationary, and the baking frame continues to move, so that the flipping plate flips the food particles accumulated in the baking frame, and the driving module rotates to drive the adjusting plate to move back and forth, so that the food particles passing the top of the flipping plate are guided to slide down, and the food particles are scattered in an S shape on the other side of the baking frame, thereby realizing the change of the orientation of the food particles, so that each side of the product particles can be in contact with the hot air, and the reciprocating motion of one end of the flipping plate and the adjusting plate is utilized to avoid damage to the food particles while improving the drying effect.

[0009] Furthermore, the hot air drying unit includes a fan and a heating element fixedly installed at the bottom of the drying box, and the heating element is arranged above the fan.

[0010] By adopting the above technical solution, the heating element uses a heating rod, the heating element is heated to the working temperature, and the fan rotates to drive the air flow in the drying box to move in a circular motion, so that the flowing hot air contacts the food particles, thereby removing moisture from the food particles.

[0011] Furthermore, the circulating conveying unit includes chains arranged on both sides symmetrically in the drying box, the chains are arranged in a rectangular shape, four sprockets are meshed and connected to the chains, the sprockets are rotatably connected to the drying box, one of the sprockets is coaxially connected to a motor, and the motor is fixedly installed on the outside of the drying box.

[0012] By adopting the above technical solution, the two motors rotate synchronously, and the two chains cooperate to drive the drying frame to move clockwise in a rectangular structure.

[0013] Furthermore, the baking frame is connected to the chain through a connecting piece, and the connecting piece includes a lifting rod, a connecting frame is fixedly connected between the end of the lifting rod and the baking frame, and an insertion rod is elastically connected to the end of the lifting rod through a spring, one end of the insertion rod is plugged into a socket, and the socket is fixedly mounted on the chain.

[0014] By adopting the above technical solution, the insertion rod is L-shaped, and one end passes through the lifting rod and extends to the outside. A spring drives one end of the insertion rod to connect with the socket, so that the lifting rod can set the baking frame on the chain. By pulling the insertion rod toward the middle of the lifting rod to cancel the connection with the socket, the baking frame can be removed from the chain, making it easier to place or remove food particles on the baking frame.

[0015] Furthermore, a plurality of fixing plates 1 are evenly distributed on the inclined surface of the turning plate, the direction adjustment plate comprises an arc-shaped plate slidably matched with the turning plate, and a plurality of fixing plates 2 are evenly distributed on the arc-shaped plate.

[0016] By adopting the above technical solution, when the baking frame moves and the turning plate is stationary, the food particles on the side of the baking frame opposite to the moving direction come into contact with the turning plate to form an accumulation. When the accumulation height is higher than the turning plate, it slides along the inclined surface of one side of the turning plate to the other side of the baking frame, thereby realizing the turning and replacement of the food particles. When the food particles are on the arc plate, the arc plate drives the second fixed plate to swing back and forth, so that the food particles are scattered in an S shape, thereby improving the turning effect of the food particles.

[0017] Furthermore, the driving module includes a rotating shaft rotatably connected to the turning plate, a reciprocating screw is fixedly connected to the middle of the rotating shaft, a sliding sleeve is slidably connected to the reciprocating screw, and the sliding sleeve is fixedly connected to the arc plate; The end of the rotating shaft passes through the baking frame and is fixedly connected with a gear, one side of the gear is meshedly connected with a rack, and the rack is fixedly connected to the baking frame.

[0018] By adopting the above technical solution, after the rotating shaft contacts the positioning rod, the drying frame continues to move to make the rack drive gear rotate, and the rotating shaft drives the reciprocating screw to rotate synchronously, so that the sliding sleeve reciprocates, thereby driving the arc plate to reciprocate synchronously.

[0019] Furthermore, a connecting seat is slidably connected to the positioning rod, the connecting seat is fixedly connected to the drying box, and one end of the positioning rod is elastically connected to the connecting seat through a second spring; One end of the positioning rod is fixedly connected with a driving rod, and the trapezoidal block is in sliding contact with the driving rod.

[0020] By adopting the above technical solution, the baking frame drives the rotating shaft thereon to abut against the lower end of the positioning rod during the horizontal movement. At this time, the baking frame continues to move while the rotating shaft keeps the flipping plate stationary, so that the food particles are flipped during the process of the flipping plate moving to the other side of the baking frame. When the flipping plate moves to the other side of the baking frame, the inclined surface of the trapezoidal block close to the side of the flipping plate abuts against the driving rod, so that the positioning rod rises to cancel the limit on the rotating shaft, and then the flipping plate can move synchronously with the baking frame.

[0021] Furthermore, baffles are vertically slidably connected to both symmetrical sides of the baking frame, one side of the baffle is elastically connected to the baking frame via a spring three, and a clearance hole matched with a fixing plate one is provided on the baffle.

[0022] By adopting the above technical solution, when the flipping plate moves toward the side of the baking frame, the inclined surface of the flipping plate close to the baffle plate slides in contact with the lower end of the baffle plate and drives the baffle plate to rise vertically, so that the baffle plate can push the food particles at the corner of the baking frame to the other side of the flipping plate, avoiding the formation of flipping dead corners and improving the flipping effect of the food particles.

[0023] Furthermore, a plurality of air guide plates are fixedly provided in the middle of the drying box, and the plurality of air guide plates are arranged in a stepped structure.

[0024] By adopting the above technical scheme, each air guide plate is arranged at an angle, and multiple air guide plates are arranged in two groups symmetrically and are arranged above the fan. The upward hot air generated by the fan moves to both sides under the action of each air guide plate, so that the bottom of the drying frame can effectively contact with the hot air during the vertical movement. The hot air passes through the through holes and flows on the surface of the food particles, further improving the drying effect of the food particles. At the same time, under the action of the air guide plate, the hot air forms two serpentine airflows inside the drying box, further improving the contact effect between the hot air and the food particles.

[0025] Another object of the present invention is to provide a three-stage baking method for pet food, wherein the three-stage drying method allows the pet food to be dried at different temperatures and for different durations in each drying process, thereby reducing nutrient loss in the food and forming crispy particles.

[0026] To achieve the above object, the present invention provides the following technical solution: a three-stage baking method for pet food, comprising the following steps: S1. Raw material preparation and processing: Mix fresh meat, starch, fruits and vegetables and nutrients, and use food roller pressing equipment to roll the mixed raw materials into particles suitable for cats and dogs to eat; S2, 65℃ flash steaming: put the roller-printed particles into a 65℃ flash drying device and heat them for two hours to reduce the moisture content of the fresh meat ingredients and concentrate the nutrients; S3, 85℃ hot air slow baking: put the flash steamed food particles on the baking frame, the hot air drying unit generates 85℃ circulating hot air, and the circulating conveying unit drives the baking frame to rotate for two hours, so that the moisture of the particles evaporates slowly to form crispy particles; S4, short-term heating at 100℃: put the slow-baked food particles into a baking device at 100℃ and heat them for one hour to promote a mild Maillard reaction in the raw materials and reduce nutrient loss; S5, cooling and testing: the baked food particles are cooled and tested for moisture. The food particles that meet the requirements proceed to the next process, and the food particles that do not meet the requirements are baked again.

[0027] Compared with the prior art, the present invention has the following beneficial effects: 1. The flipping plate moves in the baking frame during the horizontal movement to flip the food particles on the baking frame. At the same time, the arc plate and the fixed plate cooperate to perform reciprocating motion, so that the flipped food particles are scattered in an S shape, avoiding damage to the food particles while replacing the contact surface of the food particles with the hot air, thereby improving the yield rate of pet food and the drying effect.

[0028] 2. When the turning plate moves toward the side of the drying frame, its inclined surface drives the baffle plate to rise vertically. The baffle plate and the turning plate cooperate to turn the product particles on the side of the drying frame to the other side, avoiding dead corners in the turning of the particles and ensuring that all particles in the entire range of the drying frame can be turned.

[0029] 3. The setting of the air guide plate can increase the contact range between the hot air and the drying frame and food particles on the one hand, and form two circular airflows in the drying box on the other hand, thereby further improving the drying effect of the food particles.

[0030] 4. Through the three-stage baking process, the degree of starch gelatinization of baked pet food can be increased to more than 90%, making the starch in pet food easily hydrolyzed by enzymes, which is conducive to digestion and absorption, and at the same time can improve the texture and taste of pet food. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the structural anatomy of the drying box of the present invention; Figure 3 It is a schematic diagram of the structural circulation conveying unit of the present invention; Figure 4 It is a schematic diagram of the structure of the baking frame and the material turning module of the present invention; Figure 5 It is a schematic diagram of the baking frame and baffle structure of the present invention; Figure 6 For the present invention Figure 5 A is an enlarged schematic diagram of the structural anatomy at center A; Figure 7 It is a schematic diagram of the anatomical structure of the connector of the present invention; Figure 8 This is a schematic diagram of the split structure of the material turning module of the present invention; Fig. 9 It is a schematic diagram of the structure of the driving module of the present invention; Fig.10 It is a schematic diagram of the structure of the flip plate and the curved plate of the present invention; Fig.11 It is a schematic diagram of the structure of the positioning component of the present invention; Fig.12 It is a schematic diagram of the coordination of the baking frame, rotating shaft and positioning rod structure of the present invention.

[0032] In the figure: 1. Drying box; 101. Fan; 102. Heating element; 103. Air guide plate; 2. Circulating conveying unit; 201. Chain; 202. Motor; 3. Drying frame; 301. Baffle; 302. Spring three; 4. Connector; 401. Lifting rod; 402. Connecting frame; 403. Spring one; 404. Inserting rod; 405. Socket; 5. Flipping module; 501. Flipping plate; 502. Fixed plate one; 503. Arc plate; 504. Fixed plate two; 6. Driving module; 601. Rotating shaft; 602. Reciprocating screw rod; 603. Sliding sleeve; 604. Gear; 605. Rack; 7. Positioning assembly; 701. Positioning rod; 702. Connecting seat; 703. Spring two; 704. Trapezoidal block; 705. Driving rod. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0034] Example 1, reference Figure 1-Figure 12 , which is the first embodiment of the present invention, provides a surrounding hot air slow drying device for processing pet food, including a drying box 1, a hot air drying unit is installed at the bottom of the drying box 1, a circulating conveying unit 2 is installed in the drying box 1, a plurality of drying frames 3 are evenly distributed on the circulating conveying unit 2, a turning mechanism is arranged in the drying frame 3, a positioning assembly 7 is installed in the drying box 1, the turning mechanism cooperates with the positioning assembly 7 to turn the raw materials in the drying frame 3; the turning mechanism includes a turning module 5 and a driving module 6, the turning module 5 includes a turning plate 501 that is slidably matched with the drying frame 3, the turning plate 501 has an isosceles triangle structure in cross section, a direction adjustment plate is arranged on the top of the turning plate 501, and the driving module 6 is arranged in the turning plate 501 to drive the direction adjustment plate to move back and forth; the positioning assembly 7 includes a positioning rod 701 elastically connected to the drying box 1, the driving module 6 is in abutment with the positioning rod 701, and the positioning assembly 7 also includes a trapezoidal block 704 arranged at the corner of the drying frame 3, and the trapezoidal block 704 is in sliding contact with the positioning rod 701.

[0035] Specifically, the pet food particles are spread on the baking frame 3, and the circulating conveying unit 2 drives each baking frame 3 to perform a circulating motion. The hot air drying unit generates hot air in the drying box 1. When the hot air passes through the baking frame 3, moisture is removed from the pet food particles. Whenever the baking frame 3 moves to the vicinity of the positioning component 7, the driving module 6 abuts against the positioning rod 701 to keep the flipping plate 501 stationary, and the baking frame 3 continues to move, so that the flipping plate 501 flips the food particles accumulated in the baking frame 3, and the driving module 6 rotates to drive the adjustment plate to move back and forth, so that the food particles passing the top of the flipping plate 501 are guided to slide down, so that the food particles are scattered in an S shape on the other side of the baking frame 3, thereby realizing the change of the orientation of the food particles, so that each side of the food particles can be in contact with the hot air, and the reciprocating motion of one end of the flipping plate 501 and the adjustment plate is utilized to avoid damage to the food particles while improving the drying effect.

[0036] A plurality of through holes are provided at the bottom of the baking frame 3 , and the diameter of the through holes is smaller than the diameter of the pet food particles, so that part of the hot air can pass through the through holes and contact the food particles at the bottom of the baking frame 3 .

[0037] Reference Figure 1-Figure 2 The hot air drying unit includes a fan 101 and a heating element 102 fixedly installed at the bottom of the drying box 1, and the heating element 102 is arranged above the fan 101.

[0038] Specifically, the heating element 102 is a heating rod, and the heating element 102 is heated to the working temperature. The fan 101 rotates to drive the airflow in the drying box 1 to move in a circular motion, so that the flowing hot air contacts the food particles, thereby removing moisture from the food particles.

[0039] Among them, the drying box 1 is composed of a box body and a box door, a control module is installed on the box door, and a temperature and humidity sensor is installed on the top of the box body. The temperature and humidity sensor, fan 101, and heating element 102 are all connected with the control module signal. The control module controls the heating element 102 to heat to the working temperature, and controls the fan 101 to rotate to drive the airflow in the drying box 1 to move in a circular motion. The temperature and humidity sensor monitors the temperature and humidity data in the drying box 1 and displays it on the control module.

[0040] Reference Figure 3 The circulating conveying unit 2 includes a chain 201 symmetrically arranged on both sides of the drying box 1. The chain 201 is arranged in a rectangular shape. Four sprockets are meshed and connected to the chain 201. The sprockets are rotatably connected to the drying box 1. A motor 202 is coaxially connected to one of the sprockets. The motor 202 is fixedly installed on the outside of the drying box 1.

[0041] Specifically, the motor 202 is connected to the control module signal, the two motors 202 rotate synchronously, and the two chains 201 cooperate to drive the baking frame 3 to perform clockwise movement in a rectangular structure.

[0042] Reference Figure 7 The baking frame 3 is connected to the chain 201 through a connecting piece 4, and the connecting piece 4 includes a lifting rod 401. A connecting frame 402 is fixedly connected between the end of the lifting rod 401 and the baking frame 3, and an insertion rod 404 is elastically connected to the end of the lifting rod 401 through a spring 403. One end of the insertion rod 404 is plugged into a socket 405, and the socket 405 is fixedly installed on the chain 201.

[0043] Specifically, the insertion rod 404 is L-shaped, and one end passes through the lifting rod 401 and extends to the outside. The spring 403 drives one end of the insertion rod 404 to connect with the socket 405, so that the lifting rod 401 can set the baking frame 3 on the chain 201. By pulling the insertion rod 404 toward the middle of the lifting rod 401 to cancel the connection with the socket 405, the baking frame 3 can be removed from the chain 201, which is convenient for placing or removing food particles on the baking frame 3.

[0044] Reference Figure 8 A plurality of fixing plates 502 are evenly distributed on the inclined surface of the turning plate 501 , and the direction adjustment plate includes an arc plate 503 that slidably cooperates with the turning plate 501 , and a plurality of fixing plates 504 are evenly distributed on the arc plate 503 .

[0045] Specifically, when the baking frame 3 moves and the turning plate 501 is stationary, the food particles on the side of the baking frame 3 opposite to the moving direction come into contact with the turning plate 501 to form an accumulation. When the accumulation height is higher than the turning plate 501, it slides along the inclined surface of one side of the turning plate 501 to the other side of the baking frame 3, thereby realizing the turning and replacement of the food particles. When the food particles are on the arc plate 503, the arc plate 503 drives the fixed plate 2 504 to swing back and forth, so that the food particles are scattered in an S shape, thereby improving the turning effect of the food particles.

[0046] Reference Fig. 9 The driving module 6 includes a rotating shaft 601 rotatably connected to the turning plate 501, a reciprocating screw rod 602 is fixedly connected to the middle of the rotating shaft 601, a sliding sleeve 603 is slidably connected to the reciprocating screw rod 602, and the sliding sleeve 603 is fixedly connected to the arc plate 503; the end of the rotating shaft 601 passes through the drying frame 3 and is fixedly connected to a gear 604, one side of the gear 604 is meshed with a rack 605, and the rack 605 is fixedly connected to the drying frame 3.

[0047] Specifically, after the rotating shaft 601 abuts against the positioning rod 701, the baking frame 3 continues to move to make the rack 605 drive the gear 604 to rotate, and the rotating shaft 601 drives the reciprocating screw rod 602 to rotate synchronously, so that the sliding sleeve 603 reciprocates, thereby driving the arc plate 503 to reciprocate synchronously.

[0048] Reference Fig.11The positioning rod 701 is slidably connected with a connecting seat 702, and the connecting seat 702 is fixedly connected to the drying box 1. One end of the positioning rod 701 is elastically connected to the connecting seat 702 through a spring 2 703; one end of the positioning rod 701 is fixedly connected with a driving rod 705, and the trapezoidal block 704 is in sliding contact with the driving rod 705.

[0049] Specifically, during the horizontal movement of the baking frame 3, the rotating shaft 601 thereon is driven to abut against the lower end of the positioning rod 701. At this time, when the baking frame 3 continues to move, the rotating shaft 601 keeps the flipping plate 501 stationary, so that the food particles are flipped during the process of the flipping plate 501 moving to the other side of the baking frame 3. When the flipping plate 501 moves to the other side of the baking frame 3, the inclined surface of the trapezoidal block 704 close to the side of the flipping plate 501 abuts against the driving rod 705, so that the positioning rod 701 rises to cancel the limit on the rotating shaft 601, and then the flipping plate 501 can move synchronously with the baking frame 3.

[0050] Among them, refer to Figure 3 , Fig.11 The connecting seat 702 is arranged inside the upper right corner and the lower left corner of the chain 201, so that the flipping plate 501 moves from right to left when the baking frame 3 moves to the right on the upper side of the chain 201, and the flipping plate 501 moves from left to right when the baking frame 3 moves to the left on the lower side of the chain 201. When the baking frame 3 completes a circle of movement following the chain 201, the flipping plate 501 performs a reciprocating movement, flipping the food particles in the baking frame 3 twice.

[0051] Example 2, reference Figure 4-Figure 8 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that baffles 301 are vertically slidably connected to both symmetrical sides of the baking frame 3, one side of the baffle 301 is elastically connected to the baking frame 3 through a spring three 302, and a clearance hole adapted to the fixed plate one 502 is opened on the baffle 301.

[0052] Specifically, when the turning plate 501 moves toward the side of the baking frame 3, the inclined surface of the turning plate 501 close to the baffle 301 slides in contact with the lower end of the baffle 301 and drives the baffle 301 to rise vertically, so that the baffle 301 can push the food particles at the corner of the baking frame 3 to the other side of the turning plate 501, avoiding the generation of a turning dead angle and improving the turning effect of the food particles. The rest of the structure is the same as that of Example 1.

[0053] Example 3, reference Figure 2-Figure 3 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that a plurality of air guide plates 103 are fixedly provided in the middle of the drying box 1, and the plurality of air guide plates 103 are arranged in a stepped structure.

[0054] Specifically, each air guide plate 103 is arranged at an angle, and the multiple air guide plates 103 are arranged in two groups symmetrically and are arranged above the fan 101. The upward hot air generated by the fan 101 moves to both sides under the action of each air guide plate 103, so that the bottom of the drying frame 3 can effectively contact with the hot air during the vertical movement. The hot air flows through the through holes on the surface of the food particles, further improving the drying effect of the food particles. At the same time, under the action of the air guide plates 103, the hot air forms two meandering airflows inside the drying box 1, further improving the contact effect between the hot air and the food particles. The rest of the structure is the same as that of Example 2.

[0055] Example 4, reference Figure 1-Figure 12 , which is a fourth embodiment of the present invention, provides: a three-stage baking method for pet food, comprising the following steps: S1. Raw material preparation and processing: Mix fresh meat, starch, fruits and vegetables and nutrients, and use food roller pressing equipment to roll the mixed raw materials into particles suitable for cats and dogs to eat; S2, 65℃ flash steaming: put the roller-printed particles into a 65℃ flash drying device and heat them for two hours to reduce the moisture content of the fresh meat ingredients and concentrate the nutrients; S3, 85°C hot air slow baking: the flash-steamed food particles are placed on the baking frame 3, the hot air drying unit generates 85°C circulating hot air, and the circulating conveying unit 2 drives the baking frame 3 to rotate for two hours, so that the moisture of the particles evaporates slowly to form crisp particles; S4, short-term heating at 100℃: put the slow-baked food particles into a baking device at 100℃ and heat them for one hour to promote a mild Maillard reaction in the raw materials and reduce nutrient loss; S5, cooling and testing: the baked food particles are cooled and tested for moisture. The food particles that meet the requirements proceed to the next process, and the food particles that do not meet the requirements are baked again.

[0056] Among them, after the pet food undergoes three-stage baking from S2 to S4, the baked grain starch in the raw material absorbs water and expands under high temperature, which increases the gelatinization degree of the baked grain starch to more than 90%. By increasing the gelatinization degree, the starch in the raw material can be easily hydrolyzed by enzymes, which is beneficial for digestion and absorption, and at the same time can improve the texture and taste of pet food.

[0057] Based on Examples 1-4, the working principle of the present invention is as follows: the particles flash-evaporated at 65°C are spread on each drying frame 3, the oven door is closed, and the fan 101 and the heating element 102 are turned on to form a hot air environment of 85°C in the drying oven 1. The motor 202 drives the chain 201 to rotate clockwise. The hot air forms a zigzag airflow in the drying oven 1 under the action of the air guide plate 103 and contacts the bottom of the moving drying frame 3 and the surface of the food particles. The drying frame 3 drives the rotating shaft 601 thereon to abut against the lower end of the positioning rod 701 during the horizontal movement. At this time, when the drying frame 3 continues to move, the rotating shaft 601 keeps the flipping plate 501 stationary, so that the flipping plate 501 moves to the other side of the drying frame 3. At this time, when the baking frame 3 moves, the rack 605 drives the gear 604 to rotate, and the rotating shaft 601 drives the reciprocating screw 602 to rotate synchronously, so that the sliding sleeve 603 reciprocates, and the arc plate 503 reciprocates synchronously. During the movement of the flipping plate 501 relative to the baking frame 3, it cooperates with the fixed plate 2 504 to spread the food particles to the other side in an S shape, so that the food particles continue to contact with the hot air after changing their orientation. When the flipping plate 501 moves to the other side of the baking frame 3, the inclined surface of the trapezoidal block 704 close to one side of the flipping plate 501 abuts against the driving rod 705, so that the positioning rod 701 rises to cancel the limit on the rotating shaft 601, and then the flipping plate 501 follows the baking frame 3 to move synchronously.

[0058] After two hours of drying, the fan 101, the heating element 102 and the motor 202 are stopped, and the door is opened. After the temperature is lowered, the insertion rod 404 is pulled toward the middle of the lifting rod 401 to cancel the connection with the socket 405, and the baking frame 3 can be removed from the chain 201, so that the food particles on the baking frame 3 can be easily removed.

[0059] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A surrounding hot air slow drying equipment for pet food processing, characterized in that: The drying box (1) comprises a hot air drying unit installed at the bottom of the drying box (1), a circulating conveying unit (2) installed in the drying box (1), a plurality of drying frames (3) evenly distributed on the circulating conveying unit (2), a material turning mechanism provided in the drying frame (3), a positioning assembly (7) installed in the drying box (1), the material turning mechanism cooperates with the positioning assembly (7) to turn the raw materials in the drying frame (3); The material turning mechanism comprises a material turning module (5) and a driving module (6); the material turning module (5) comprises a material turning plate (501) slidably matched with the drying frame (3); the cross section of the material turning plate (501) is an isosceles triangle structure; a direction adjustment plate is arranged on the top of the material turning plate (501); the driving module (6) is arranged inside the material turning plate (501) and is used to drive the direction adjustment plate to move back and forth; The positioning assembly (7) comprises a positioning rod (701) elastically connected to the drying box (1), the driving module (6) abuts against the positioning rod (701), and the positioning assembly (7) further comprises a trapezoidal block (704) arranged at a corner of the drying frame (3), the trapezoidal block (704) being in sliding contact with the positioning rod (701).

2. The surrounding hot air slow drying equipment for pet food processing according to claim 1, characterized in that: The hot air drying unit comprises a fan (101) and a heating element (102) fixedly mounted on the bottom of the drying box (1); the heating element (102) is arranged above the fan (101).

3. The surrounding hot air slow drying equipment for pet food processing according to claim 1, characterized in that: The circulating conveying unit (2) comprises a chain (201) arranged on two symmetrical sides of the drying box (1); the chain (201) is arranged in a rectangular shape; four sprockets are meshedly connected to the chain (201); the sprockets are rotatably connected to the drying box (1); a motor (202) is coaxially connected to one of the sprockets; the motor (202) is fixedly mounted on the outside of the drying box (1).

4. The surrounding hot air slow drying equipment for pet food processing according to claim 3, characterized in that: The baking frame (3) is connected to the chain (201) via a connecting piece (4), wherein the connecting piece (4) comprises a lifting rod (401), wherein a connecting frame (402) is fixedly connected between the end of the lifting rod (401) and the baking frame (3), and an inserting rod (404) is elastically connected to the end of the lifting rod (401) via a spring (403), wherein one end of the inserting rod (404) is plugged into a socket (405), and the socket (405) is fixedly mounted on the chain (201).

5. The surrounding hot air slow drying equipment for pet food processing according to claim 1, characterized in that: A plurality of first fixing plates (502) are evenly distributed on the inclined surface of the turning plate (501), the direction adjustment plate comprises an arc-shaped plate (503) slidably matched with the turning plate (501), and a plurality of second fixing plates (504) are evenly distributed on the arc-shaped plate (503).

6. The surrounding hot air slow drying equipment for pet food processing according to claim 5, characterized in that: The driving module (6) comprises a rotating shaft (601) rotatably connected to the turning plate (501), a reciprocating screw rod (602) being fixedly connected to the middle of the rotating shaft (601), a sliding sleeve (603) being slidably connected to the reciprocating screw rod (602), and the sliding sleeve (603) being fixedly connected to the arc plate (503); The end of the rotating shaft (601) passes through the baking frame (3) and is fixedly connected to a gear (604); one side of the gear (604) is meshingly connected to a rack (605); and the rack (605) is fixedly connected to the baking frame (3).

7. The surrounding hot air slow drying equipment for pet food processing according to claim 1, characterized in that: The positioning rod (701) is slidably connected to a connecting seat (702), the connecting seat (702) is fixedly connected to the drying box (1), and one end of the positioning rod (701) is elastically connected to the connecting seat (702) via a second spring (703); One end of the positioning rod (701) is fixedly connected to a driving rod (705), and the trapezoidal block (704) is in sliding contact with the driving rod (705).

8. The hot air surrounding slow drying equipment for pet food processing according to claim 5, characterized in that: The baking frame (3) is symmetrically provided with baffles (301) on both sides thereof for vertical sliding connection. One side of the baffle (301) is elastically connected to the baking frame (3) via a spring three (302). A clearance hole matching the fixing plate one (502) is provided on the baffle (301).

9. The surrounding hot air slow drying equipment for pet food processing according to claim 1, characterized in that: A plurality of air guide plates (103) are fixedly arranged in the middle of the drying box (1), and the plurality of air guide plates (103) are arranged in a stepped structure.

10. A three-stage baking method for pet food, using the surrounding hot air slow baking equipment for pet food processing according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Raw material preparation and processing: Mix fresh meat, starch, fruits and vegetables and nutrients, and use food roller pressing equipment to roll the mixed raw materials into particles suitable for cats and dogs to eat; S2, 65℃ flash steaming: put the roller-printed particles into a 65℃ flash drying device and heat them for two hours to reduce the moisture content of the fresh meat ingredients and concentrate the nutrients; S3, 85°C hot air slow baking: the flash-steamed food particles are placed on a baking frame (3), the hot air drying unit generates circulating hot air at 85°C, and the circulating conveying unit (2) drives the baking frame (3) to rotate for two hours, so that the moisture in the particles evaporates slowly, forming crisp particles; S4, short-term heating at 100℃: put the slow-baked food particles into a baking device at 100℃ and heat them for one hour to promote a mild Maillard reaction in the raw materials and reduce nutrient loss; S5, cooling and testing: the baked food particles are cooled and tested for moisture. The food particles that meet the requirements proceed to the next process, and the food particles that do not meet the requirements are baked again.

Images