An around hot air slow baking device for pet food processing and a three-stage baking method

Abstract

The present invention relates to the technical field of pet food processing, and discloses a surrounding hot air slow drying device for pet food processing and a three-stage baking method. Among them, a surrounding hot air slow drying device for pet food processing includes a drying box. A hot air drying unit is installed at the bottom inside the drying box. A circulating conveying unit is installed inside the drying box. A plurality of baking frames are evenly distributed on the circulating conveying unit. A material turning mechanism is arranged inside the baking frame. A positioning component is installed inside the drying box. The material turning mechanism cooperates with the positioning component to turn the raw materials inside the baking frame. By moving the turning plate inside the baking frame, the positions of the food particles on the baking frame are turned. At the same time, the arc-shaped plate and the second fixing plate cooperate to make the food particles spread in an S shape, avoiding damage to the food particles while realizing the replacement of the contact surface between the food particles and the hot air, improving the yield rate of pet food while enhancing the drying effect. Through the three-stage baking process, the starch gelatinization degree of the baked grains of pet food can be increased to more than 90%, which is beneficial to digestion and absorption.

Description

Technical Field

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

[0002] Pet food is specially provided for pets and small animals, and its main function is to provide the most basic life guarantee, growth and development, and nutrients required for health for various pets. During the processing of meat pet food, the meat materials need to be roll-printed into granular shapes and then dried to make them dehydrated and crispy.

[0003] During the drying process of meat pet food, the food particles are placed in the cylinder inside the drying device, and the internal material turning mechanism drives the food particles to turn and makes them contact with hot air to achieve dehydration and drying. For example, in the patent with the prior art publication number CN117647079A, a sterile drying device for pet food processing is disclosed. A plurality of hollow plates are used to stir the pet food raw materials on the inner wall of the drying cylinder, promoting the tumbling of the static pet food raw materials to avoid the phenomenon of mutual condensation. Through the setting of the material passing holes, part of the pet food raw materials can pass through the hollow plates, and air holes are arranged on the outer sides of the plurality of hollow plates, so that the hot air flow is directly discharged into the interior of the pet food raw materials to release heat from the interior of the pet food raw materials.

[0004] However, the prior art still has the following defects: during the stirring process of pet food raw materials, the raw materials at the corners are easily broken due to the friction and extrusion between the hollow plates and the cylinder body, and the pet food raw materials will fall from a high place multiple times, and the impact generated during the fall is likely to 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 that pet food particles are broken during the stirring process in the prior art, a surrounding hot air slow drying device for pet food processing is proposed.

[0006] Its purpose is to: realize the turning of the food particles on the baking frame through the translation of the turning plate, and in combination with the reciprocating movement of the steering plate, make the food particles spread in an S shape, avoiding damage to the food particles while improving the drying effect.

[0007] The technical solution of the present invention is a surrounding hot air slow drying device for pet food processing, including a drying box, a hot air drying unit is installed at the bottom inside the drying box, a circulating conveying unit is installed inside the drying box, a plurality of baking frames are evenly distributed on the circulating conveying unit, a turning mechanism is arranged inside the baking frame, a positioning component is installed inside the drying box, and the turning mechanism cooperates with the positioning component to turn the food particles in the baking frame;

[0008] The turning mechanism includes a turning module and a driving module. The turning module includes a turning plate that is slidably engaged with the drying frame. The cross-section of the turning plate is an isosceles triangle structure. A steering plate is provided at the top of the turning plate. The driving module is disposed within the turning plate and is used to drive the steering plate to reciprocate.

[0009] The positioning assembly includes a positioning rod that is elastically connected to the drying box. The driving module is in abutting cooperation with the positioning rod. The positioning assembly further includes a trapezoidal block provided at the corners of the drying frame, and the trapezoidal block is in sliding contact with the positioning rod.

[0010] With the above technical solution, the product particles are laid flat on the drying frame. The circulating conveying unit drives each drying frame to perform circular motion. The hot air drying unit generates hot air inside the drying box. When the hot air passes through the drying frame, the moisture of the product particles is removed. Whenever the drying frame moves near the positioning assembly, the driving module abuts against the positioning rod to keep the turning plate stationary. At the same time, the drying frame continues to move, causing the turning plate to turn the food particles piled up in the drying frame. Moreover, the driving module rotates to drive the steering plate to reciprocate, so as to guide the sliding of the food particles passing through the top of the turning plate, making the food particles spread in an S shape on the other side of the drying frame, realizing the replacement of the orientation of the food particles, enabling each side of the product particles to come into contact with the hot air, and using the reciprocating motion of one end of the turning plate and the steering plate to avoid damage to the food particles while improving the drying effect.

[0011] Further, the hot air drying unit includes a fan and a heating element fixedly installed at the bottom inside the drying box, and the heating element is disposed above the fan.

[0012] With the above technical solution, the heating element uses a heating rod. The heating element is heated to the operating temperature, and the fan rotates to drive the air flow inside the drying box to perform circular motion, so that the flowing hot air comes into contact with the food particles, realizing the removal of the moisture in the food particles.

[0013] Further, the circulating conveying unit includes chains disposed on two symmetric sides inside the drying box. The chains are arranged in a rectangular shape. Four sprockets are meshed and connected to the chains, and the sprockets are rotatably connected to the drying box. One of the sprockets is coaxially connected with a motor, and the motor is fixedly installed outside the drying box.

[0014] With the above technical solution, the two motors rotate synchronously, and the two chains cooperate to drive the drying frame to perform a clockwise motion in a rectangular structure.

[0015] Further, the drying frame is connected to the chain through a connecting member. The connecting member includes a lifting rod. A connecting frame is fixedly connected between the end of the lifting rod and the drying frame. And an insertion rod is elastically connected inside the end of the lifting rod through a first spring. One end of the insertion rod is inserted and fitted with a socket, and the socket is fixedly installed on the chain.

[0016] With the above technical solution, the insertion rod has an L-shaped structure, and one end passes through the lifting rod and extends to the outside. The first spring drives one end of the insertion rod to be connected to the socket, so that the lifting rod can set the baking frame on the chain. By pulling the insertion rod towards the middle of the lifting rod to cancel the insertion with the socket, the baking frame can be removed from the chain, which is convenient for placing or taking out food particles on the baking frame.

[0017] Further, a plurality of first fixing plates are evenly distributed on the inclined surface of the turning plate, and the turning plate includes an arc plate that is slidably matched with the turning plate, and a plurality of second fixing plates are evenly distributed on the arc plate.

[0018] With 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 contact the turning plate and form a pile. When the pile height is higher than the turning plate, it slides down along the inclined surface of one side of the turning plate to the other side of the baking frame, realizing the turning and transposition of the food particles. And when the food particles are on the arc plate, the arc plate drives the second fixing plate to swing reciprocally, so that the food particles are scattered in an S shape, improving the turning effect on the food particles.

[0019] Further, the driving module includes a rotating shaft rotatably connected to the turning plate. A reciprocating lead screw is fixedly connected to the middle of the rotating shaft. A sliding sleeve is slidably connected to the reciprocating lead screw, and the sliding sleeve is fixedly connected to the arc plate;

[0020] One end of the rotating shaft passes through the baking frame and is fixedly connected to a gear. A rack is meshed and connected to one side of the gear, and the rack is fixedly connected to the baking frame.

[0021] With the above technical solution, after the rotating shaft abuts against the positioning rod, when the baking frame continues to move, the rack drives the gear to rotate, and the rotating shaft drives the reciprocating lead screw to rotate synchronously, so that the sliding sleeve makes a reciprocating motion, thereby driving the arc plate to make a synchronous reciprocating motion.

[0022] Further, 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;

[0023] One end of the positioning rod is fixedly connected to a driving rod, and the trapezoidal block is in sliding contact with the driving rod.

[0024] With the above technical solution, during the horizontal movement of the baking frame, the rotating shaft on it abuts against the lower end of the positioning rod. At this time, when the baking frame continues to move, the rotating shaft keeps the turning plate stationary, realizing the turning of the food particles during the process of the turning plate moving to the other side of the baking frame. When the turning plate moves to the other side of the baking frame, the inclined surface of the trapezoidal block close to the turning plate abuts against the driving rod, causing the positioning rod to rise to cancel the limit on the rotating shaft, and then the turning plate can move synchronously with the baking frame.

[0025] Further, baffles are vertically slidably connected to both symmetric sides of the baking frame. One side of each baffle is elastically connected to the baking frame through a third spring, and a relief hole adapted to the first fixing plate is formed in the baffle.

[0026] With the above technical solution, when the turning plate moves towards the side of the baking frame, the inclined surface of the turning plate close to the baffle slides into contact with the lower end of the baffle and drives the baffle to rise vertically, so that the baffle can push the food particles at the corners of the baking frame to the other side of the turning plate, avoiding the dead angle of turning and improving the turning effect of the food particles.

[0027] Further, a plurality of air guiding plates are fixedly arranged in the middle of the drying box, and the plurality of air guiding plates are arranged in a stepped structure.

[0028] With the above technical solution, each air guiding plate is inclined, and the plurality of air guiding plates are symmetrically arranged in two groups and are arranged above the fan. The hot air generated by the fan moves upward and moves to both sides under the action of each air guiding plate, so that the bottom of the baking frame can be effectively contacted 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 on the food particles. At the same time, under the action of the air guiding plates, the hot air forms two circular air flows inside the drying box, further improving the contact effect between the hot air and the food particles.

[0029] Another object of the present invention is to provide a three-stage baking method for pet food, aiming to: reduce the loss of ingredients nutrition and form crispy particles by using different temperatures and different durations in each stage of drying the pet food through three-stage drying.

[0030] 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:

[0031] S1. Raw material preparation and processing: Mix fresh meat, starch, fruits and vegetables, and nutrients, and roll the mixed raw materials into particles suitable for cats and dogs to eat through food rolling equipment;

[0032] S2. 65°C flash drying: Put the rolled particles into a flash drying device at 65°C and heat for two hours to reduce the moisture content of the fresh meat ingredients and concentrate the nutrients;

[0033] S3. 85°C hot air slow drying: Put the flash-dried food particles on the baking frame, and the hot air drying unit generates circulating hot air at 85°C. The circulating conveying unit drives the baking frame to rotate for two hours to slowly evaporate the moisture of the particles and form crispy particles;

[0034] S4. 100°C short-time heating: Put the slowly dried food particles into a baking device at 100°C and heat for one hour to promote a mild Maillard reaction of the raw materials and reduce the loss of nutrients;

[0035] S5, Cooling and Detection: Cool the baked food particles, conduct moisture detection on them. The food particles that meet the requirements enter the next process, and the food particles that do not meet the requirements are baked again.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. During the horizontal movement of the baking frame, the turning plate moves within the baking frame, turning the position of the food particles on the baking frame. At the same time, the arc-shaped plate and the second fixing plate cooperate to perform reciprocating motion, so that the turned food particles are scattered in an S shape, avoiding damage to the food particles while realizing the replacement of the surface of the food particles in contact with the hot air, improving the yield rate of pet food while enhancing the drying effect.

[0038] 2. When the turning plate moves towards the side of the baking frame, its inclined surface drives the baffle to rise vertically. The baffle and the turning plate cooperate to turn the product particles on the side of the baking frame to the other side, avoiding dead corners in the turning of the particles and ensuring that all the particles within the entire range of the baking frame can be turned.

[0039] 3. Through the setting of the air guide plate, on the one hand, it can increase the contact range between the hot air and the baking frame and the food particles, and on the other hand, it forms two circular airflows within the drying box, thereby further enhancing the drying effect on the food particles.

[0040] 4. Through the three-stage baking process for pet food ingredients, the gelatinization degree of the baked grains in pet food can be increased to more than 90%, making the starch in pet food easily hydrolyzed by enzymes, which is beneficial for digestion and absorption. At the same time, it can improve the texture and taste of pet food. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a three-dimensional structure schematic diagram of the whole of the present invention;

[0042] Figure 2 It is an anatomical structure schematic diagram of the drying box of the present invention;

[0043] Figure 3 It is a schematic diagram of the structure circulation conveying unit of the present invention;

[0044] Figure 4 It is a schematic diagram of the structure of the baking frame and the turning module of the present invention;

[0045] Figure 5 It is a schematic diagram of the structure of the baking frame and the baffle of the present invention;

[0046] Figure 6 It is of the present invention Figure 5 Anatomical structure enlarged schematic diagram of part A;

[0047] Figure 7Anatomical schematic diagram of the connecting piece structure of the present invention;

[0048] Figure 8 Exploded schematic diagram of the material turning module structure of the present invention;

[0049] Figure 9 Schematic diagram of the driving module structure of the present invention;

[0050] Figure 10 Anatomical schematic diagram of the material turning plate and arc plate structure of the present invention;

[0051] Figure 11 Schematic diagram of the positioning component structure of the present invention;

[0052] Figure 12 Schematic diagram of the structural cooperation of the drying frame, rotating shaft and positioning rod of the present invention.

[0053] In the figure:

[0054] 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. Connecting piece; 401. Lifting rod; 402. Connecting frame; 403. Spring one; 404. Insert rod; 405. Socket; 5. Material turning module; 501. Material turning plate; 502. Fixed plate one; 503. Arc plate; 504. Fixed plate two; 6. Driving module; 601. Rotating shaft; 602. Reciprocating lead screw; 603. Sliding sleeve; 604. Gear; 605. Rack; 7. Positioning component; 701. Positioning rod; 702. Connecting seat; 703. Spring two; 704. Trapezoidal block; 705. Driving rod. Detailed implementation manners

[0055] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention will be given with reference to the accompanying drawings of the specification.

[0056] Example 1, refer to Figures 1-12, which is the first embodiment of the present invention, provides a surrounding hot air slow drying device for pet food processing, including a drying box 1. A hot air drying unit is installed at the bottom inside the drying box 1. A circulating conveying unit 2 is installed inside the drying box 1. A plurality of drying frames 3 are evenly distributed on the circulating conveying unit 2. A material turning mechanism is arranged inside the drying frame 3. A positioning component 7 is installed inside the drying box 1. The material turning mechanism cooperates with the positioning component 7 to turn the raw materials inside the drying frame 3. The material turning mechanism includes a material turning module 5 and a driving module 6. The material turning module 5 includes a material turning plate 501 that is slidably matched with the drying frame 3. The cross-section of the material turning plate 501 is an isosceles triangle structure. A steering plate is arranged at 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 steering plate to reciprocate. The positioning component 7 includes a positioning rod 701 that is elastically connected to the drying box 1. The driving module 6 is in abutting cooperation with the positioning rod 701. The positioning component 7 further includes a trapezoidal block 704 arranged at the corners of the drying frame 3. The trapezoidal block 704 is in sliding contact with the positioning rod 701.

[0057] Specifically, pet food particles are laid flat on the drying frame 3. The circulating conveying unit 2 drives each drying frame 3 to move in a cycle. The hot air drying unit generates hot air inside the drying box 1. When the hot air passes through the drying frame 3, it removes the moisture from the pet food particles. Whenever the drying frame 3 moves near the positioning component 7, the driving module 6 abuts against the positioning rod 701 to keep the material turning plate 501 stationary. At the same time, the drying frame 3 continues to move, causing the material turning plate 501 to turn the food particles piled up inside the drying frame 3. Moreover, the driving module 6 rotates to drive the steering plate to reciprocate, guiding the food particles passing through the top of the material turning plate 501 to slide, so that the food particles are scattered in an S shape on the other side of the drying frame 3, realizing the replacement of the orientation of the food particles and enabling each side of the food particles to contact the hot air. By using the reciprocating movement of one end of the material turning plate 501 and the steering plate, the drying effect is improved while avoiding damage to the food particles.

[0058] Among them, a plurality of through holes are opened at the bottom of the drying frame 3. 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 drying frame 3.

[0059] Referring to Figures 1-2 , the hot air drying unit includes a fan 101 and a heating element 102 that are fixedly installed at the bottom inside the drying box 1. The heating element 102 is arranged above the fan 101.

[0060] Specifically, the heating element 102 uses a heating rod. The heating element 102 is heated to the working temperature. The fan 101 rotates to drive the air flow inside the drying box 1 to move in a circular motion, so that the flowing hot air contacts the food particles, realizing the removal of moisture from the food particles.

[0061] 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. A temperature and humidity sensor is installed at the top inside the box body. The temperature and humidity sensor, the fan 101, and the heating element 102 are all signal-connected to the control module. The control module controls the heating element 102 to heat to the working temperature, and controls the fan 101 to rotate to drive the air flow inside the drying box 1 to perform circular motion. The temperature and humidity sensor monitors the temperature and humidity data inside the drying box 1 and displays it on the control module.

[0062] Referring to Figure 3 , the circulating conveying unit 2 includes chains 201 arranged symmetrically on both sides inside the drying box 1. The chains 201 are arranged in a rectangle. Four sprockets are meshed and connected to the chains 201. The sprockets are rotatably connected to the drying box 1. One of the sprockets is coaxially connected to a motor 202, and the motor 202 is fixedly installed outside the drying box 1.

[0063] Specifically, the motor 202 is signal-connected to the control module. The two motors 202 rotate synchronously, and the two chains 201 cooperate to drive the drying frame 3 to perform a clockwise movement in a rectangular structure.

[0064] Referring to Figure 7 , the drying frame 3 is connected to the chain 201 through a connecting member 4. The connecting member 4 includes a lifting rod 401. A connecting frame 402 is fixedly connected between the end of the lifting rod 401 and the drying frame 3. And an insertion rod 404 is elastically connected inside the end of the lifting rod 401 through a first spring 403. One end of the insertion rod 404 is inserted and matched with a socket 405, and the socket 405 is fixedly installed on the chain 201.

[0065] Specifically, the insertion rod 404 is in an L-shaped structure, and one end passes through the lifting rod 401 and extends to the outside. The first spring 403 drives one end of the insertion rod 404 to be connected to the socket 405, so that the lifting rod 401 can set the drying frame 3 on the chain 201. By pulling the insertion rod 404 towards the middle of the lifting rod 401 to cancel its insertion with the socket 405, the drying frame 3 can be removed from the chain 201, which is convenient for placing or taking out food particles on the drying frame 3.

[0066] Referring to Figure 8 , a plurality of first fixing plates 502 are evenly distributed on the inclined surface of the turning plate 501. The turning plate includes an arc-shaped plate 503 that is slidably matched with the turning plate 501. A plurality of second fixing plates 504 are evenly distributed on the arc-shaped plate 503.

[0067] 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 accumulate after contacting the turning plate 501. When the accumulation height is higher than the turning plate 501, they slide down along the inclined surface on one side of the turning plate 501 to the other side of the baking frame 3, realizing the turning and transposition of the food particles. When the food particles are on the arc-shaped plate 503, the arc-shaped plate 503 drives the second fixing plate 504 to swing reciprocally, causing the food particles to be scattered in an S shape and enhancing the turning effect on the food particles.

[0068] Referring to Figure 9 , the driving module 6 includes a rotating shaft 601 rotatably connected to the turning plate 501. A reciprocating lead screw 602 is fixedly connected to the middle of the rotating shaft 601. A sliding sleeve 603 is slidably connected to the reciprocating lead screw 602, and the sliding sleeve 603 is fixedly connected to the arc-shaped plate 503; the end of the rotating shaft 601 passes through the baking frame 3 and is fixedly connected to a gear 604, and a rack 605 is meshed and connected to one side of the gear 604, and the rack 605 is fixedly connected to the baking frame 3.

[0069] Specifically, after the rotating shaft 601 abuts against the positioning rod 701, the baking frame 3 continues to move, causing the rack 605 to drive the gear 604 to rotate. The rotating shaft 601 drives the reciprocating lead screw 602 to rotate synchronously, causing the sliding sleeve 603 to perform a reciprocating motion, thereby driving the arc-shaped plate 503 to perform a synchronous reciprocating motion.

[0070] Referring to Figure 11 , a connecting seat 702 is slidably connected to the positioning rod 701, 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 through 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.

[0071] Specifically, during the horizontal movement of the baking frame 3, the rotating shaft 601 thereon drives the lower end of the positioning rod 701 to abut. At this time, when the baking frame 3 continues to move, the rotating shaft 601 keeps the turning plate 501 stationary, realizing the turning of the food particles during the process of the turning plate 501 moving to the other side of the baking frame 3. When the turning plate 501 moves to the other side of the baking frame 3, the inclined surface of the trapezoidal block 704 close to the turning plate 501 abuts against the driving rod 705, causing the positioning rod 701 to rise to cancel the limit on the rotating shaft 601, and then the turning plate 501 can move synchronously with the baking frame 3.

[0072] Among them, referring to Figure 3 、 Figure 11The 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.

[0073] Example 2, reference Figures 4-8 , 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.

[0074] 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.

[0075] Example 3, reference Figures 2-3 , 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.

[0076] 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.

[0077] Example 4, reference Figures 1-12 , which is a fourth embodiment of the present invention, provides: a three-stage baking method for pet food, comprising the following steps:

[0078] 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;

[0079] S2, 65°C Flash Drying: Put the granules formed by roll printing into a flash drying equipment at 65°C and heat for two hours to reduce the moisture content of fresh meat ingredients and concentrate the nutrients;

[0080] S3, 85°C Hot Air Slow Baking: Put the flash-dried food granules on the 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 to slowly evaporate the moisture of the granules and form crispy granules;

[0081] S4, 100°C Short-time Heating: Put the slowly baked food granules into a baking equipment at 100°C and heat for one hour to promote a mild Maillard reaction of the raw materials and reduce nutrient loss;

[0082] S5, Cooling and Detection: Cool the baked food granules and conduct moisture detection on them. The food granules that meet the requirements enter the next process, and the food granules that do not meet the requirements are baked again.

[0083] Among them, after the three-stage baking of pet food in S2 - S4, the baking grain starch in the raw materials absorbs water and expands at high temperature, increasing the gelatinization degree of the baking grain starch to more than 90%. By increasing the gelatinization degree, the starch in the raw materials is easily hydrolyzed by enzymes, which is beneficial to digestion and absorption. At the same time, it can improve the texture and taste of pet food.

[0084] Combining Examples 1 - 4, the working principle of the present invention: Spread the granules after 65°C flash drying on each baking frame 3, close the box door and turn on the fan 101 and heating element 102 to form a hot air environment at 85°C in the drying box 1. The motor 202 drives the chain 201 to rotate clockwise. Under the action of the air guide plate 103, the hot air forms a circulating air flow in the drying box 1 and contacts the bottom of the moving baking frame 3 and the surface of the food granules. During the horizontal movement of the baking frame 3, the rotating shaft 601 on it abuts 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 turning plate 501 stationary, causing the turning plate 501 to move to the other side of the baking 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 lead screw 602 to rotate synchronously, causing the sliding sleeve 603 to make reciprocating movements, and the arc plate 503 makes synchronous reciprocating movements. During the movement of the turning plate 501 relative to the baking frame 3, it cooperates with the fixed plate two 504 to scatter the food granules to the other side in an S shape, realizing that the food granules continue to contact the hot air after changing their orientation. When the turning plate 501 moves to the other side of the baking frame 3, the inclined surface of the trapezoidal block 704 on the side close to the turning plate 501 abuts against the driving rod 705, causing the positioning rod 701 to rise to cancel the limit on the rotating shaft 601. Subsequently, the turning plate 501 moves synchronously with the baking frame 3.

[0085] After two hours of drying, stop the operation of the fan 101, the heating element 102, and the motor 202. Open the door of the box. After the temperature drops, pull the insertion rod 404 towards the middle of the lifting rod 401 to cancel its insertion into the socket 405, and the drying frame 3 can be removed from the chain 201, which is convenient for taking out the food particles on the drying frame 3.

[0086] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within 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: It comprises 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, the circulating conveying unit comprises chains arranged at two symmetrical sides of the drying box, the chains are arranged in a rectangular shape, a plurality of drying frames are evenly distributed on the chains, 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 the raw materials 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 slidably cooperates with the baking 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, a plurality of fixed plates 1 are evenly distributed on the inclined surface of the material turning plate, the direction adjustment plate includes an arc plate that slidably cooperates with the material turning plate, a plurality of fixed plates 2 are evenly distributed on the arc plate, the driving module is arranged in the material turning plate, and is used to drive the direction adjustment plate to reciprocate, the driving module includes a rotating shaft that is rotatably connected to the material turning plate, a reciprocating screw rod is fixedly connected to the middle of the rotating shaft, a sliding sleeve is slidably connected to the reciprocating screw rod, and the sliding sleeve is connected and fixed 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; The positioning assembly includes a positioning rod elastically connected to the drying box, the rotating shaft is in abutment with the positioning rod, the positioning assembly also includes a trapezoidal block arranged at the corner of the drying frame, the trapezoidal block is in sliding contact with the positioning rod, a connecting seat is slidably connected to the positioning rod, one end of the positioning rod is elastically connected to the connecting seat by spring 2, the connecting seat is fixedly connected to the drying box, and the connecting seat is arranged on the upper right side inside the chain and the lower left side outside the chain.

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 fixedly mounted on the bottom of the drying box and a heating element, wherein the heating element is arranged above the fan.

3. The surrounding hot air slow drying equipment for pet food processing according to claim 1, characterized in that: The chain is meshed with four sprockets, which are rotatably connected to the drying box. One of the sprockets is coaxially connected to a motor, which is fixedly installed on the outside of the drying box.

4. The surrounding hot air slow drying equipment for pet food processing according to claim 3, characterized in that: 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 installed on the chain.

5. The surrounding hot air slow drying equipment for pet food processing according to claim 1, characterized in that: 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.

6. The surrounding hot air slow drying equipment for pet food processing according to claim 1, characterized in that: 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 through a spring three, and a clearance hole matched with a fixing plate one is opened on the baffle.

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

8. 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 7, 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℃ 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.

Images