Extrusion puffing device and method for producing pet feed

Abstract

The invention relates to an extruding and puffing device and method for producing pet feed, and relates to the technical field of feed production equipment.The extruding and puffing device comprises an extruding cylinder, a conveying screw is arranged in the extruding cylinder, a plurality of wedge-shaped extruding blocks evenly distributed along the circumference are arranged on the surface of the extruding cylinder in a penetrating mode, and a protective cylinder is arranged outside the extruding cylinder; a first driving mechanism for driving the wedge-shaped extrusion block to move towards the circle center of the extrusion cylinder is mounted on the protection cylinder; a steam inlet is formed in the outer end of the wedge-shaped extrusion block, and a plurality of steam outlets are formed in the inner end of the wedge-shaped extrusion block; the first driving mechanism comprises a mounting plate slidably arranged on the inner wall of the protective barrel. According to the device, the multiple wedge-shaped extrusion blocks capable of moving towards the circle center of the extrusion barrel are arranged, so that the extrusion area and the extrusion force on raw materials are increased, pressure can be applied to the raw materials from multiple directions at the same time, the more uniform extrusion effect is provided, and the extrusion bulking effect is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of feed production equipment, and in particular relates to an extrusion puffing device and method for producing pet feed. Background Art

[0002] Extrusion puffing technology is mainly used in the feed industry to produce and process pet food, urea feed for ruminant protein supplements, etc. It has incomparable advantages over traditional processing methods in processing special animal feed, aquatic feed, early weaned pig feed and feed resource development. The application of extrusion puffing technology in the feed industry has greatly increased the utilization rate of resources, high production efficiency, reduced costs, and the obtained feed is comprehensive in nutrition and good in product shape.

[0003] The existing extrusion and puffing devices only rely on the cooperation between the feeding screw and the extrusion cylinder, and generally extrude in a single direction. The uniformity and fluidity of the raw materials are poor, resulting in an unsatisfactory extrusion and puffing effect. The steam of the steam injection assembly of the existing extrusion and puffing device is generally only injected from the vicinity of the cylinder wall, and it is difficult to penetrate into the central part of the raw material, and it is difficult to ensure that the steam is evenly distributed in the raw material. When the material of the existing extrusion and puffing device flows in the extrusion cylinder, the flow state is generally relatively stable, the material is prone to agglomeration, the mixing degree between different components is poor, and the material is also easy to adhere to the cylinder wall, affecting the continuous and efficient transportation.

[0004] To this end, we provide an extrusion puffing device and method for producing pet food to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide an extrusion puffing device and method for producing pet food in view of the problems of the background technology.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0007] An extrusion puffing device for producing pet food comprises an extrusion cylinder, a feeding screw is arranged inside the extrusion cylinder, a plurality of wedge-shaped extrusion blocks evenly distributed along the circumference are penetrated through the surface of the extrusion cylinder, a protective cylinder is arranged outside the extrusion cylinder, and a first driving mechanism for driving the wedge-shaped extrusion blocks to move toward the center of the extrusion cylinder is installed on the protective cylinder.

[0008] A steam inlet is provided at the outer end of the wedge-shaped extrusion block, and a plurality of steam outlets are provided at the inner end of the wedge-shaped extrusion block; the first driving mechanism comprises a mounting plate slidably arranged on the inner wall of the protective cylinder, a wedge-shaped driving block matching the wedge-shaped extrusion block is fixedly arranged on the mounting plate, a steam conveying through hole is provided on the wedge-shaped driving block, and the wedge-shaped driving block moves to align the steam conveying through hole with the steam inlet to connect the steam conveying channel.

[0009] As a further optimization scheme of the present invention, a lug plate is fixedly sleeved on the wedge-shaped extrusion block, and a first spring for resetting the wedge-shaped extrusion block is fixedly arranged between the lug plate and the extrusion cylinder; and a cylinder for driving the movement of the mounting plate is arranged at the end of the mounting plate.

[0010] As a further optimization solution of the present invention, a steam pipe for supplying steam is also installed on the protective cylinder, and the steam pipe includes an annular pipe and a plurality of branch pipes. A connecting hose is provided between the branch pipe and the steam delivery through hole.

[0011] As a further optimization scheme of the present invention, a feeding assembly is also provided in the wedge-shaped extrusion block located at the upper part of the extrusion cylinder, and the feeding assembly is used to automatically convey feed additives into the extrusion cylinder as the wedge-shaped extrusion block moves; the feeding assembly includes a storage bin and a feed pipe located at the bottom of the storage bin, an auger is provided in the feed pipe, and a driven member for driving the auger to rotate is provided at the end of the auger, and an active member is rotatably provided on the side of the storage bin, a transmission member is provided between the active member and the driven member, and a first ratchet is coaxially provided on the side of the active member; the feeding assembly also includes a swivel seat fixed on the outer surface of the protective cylinder, and a second ratchet matching the first ratchet is rotatably provided on the swivel seat; the wedge-shaped extrusion block is provided with a storage tank for installing the storage bin and a discharge port for discharging material from the feed pipe.

[0012] As a further optimization scheme of the present invention, a temperature control component for cooling the heated raw materials is also provided in the wedge-shaped extrusion block, and the temperature control component includes a frame and an electric push rod for driving the frame to move; a plurality of rods are fixedly provided on the frame, and the rods pass through the inner end of the wedge-shaped extrusion block, and a medium inlet and a medium outlet are provided at the end of the rod, and a medium flow channel is provided inside the rod.

[0013] As a further optimization scheme of the present invention, a sensor is embedded in the end of the wedge-shaped extrusion block located inside the extrusion cylinder, and a medium input pipe and a medium output pipe are provided at the end of the wedge-shaped extrusion block located outside the extrusion cylinder. The medium input pipe is connected to the medium inlet of multiple rod bodies through a pipeline, and the medium output pipe is connected to the medium outlet of multiple rod bodies through a pipeline.

[0014] As a further optimization scheme of the present invention, a plurality of vibration units evenly distributed along the circumference are also provided on the surface of the extrusion cylinder, and a second driving mechanism for driving the plurality of vibration units to vibrate simultaneously is installed on the protective cylinder.

[0015] As a further optimization scheme of the present invention, the vibration unit includes a ball seat fixed on the extrusion cylinder and a ball head located in the ball seat; a second spring is fixed on the outer end of the ball head, and a sealing ring is provided between the ball seat and the ball head.

[0016] As a further optimization scheme of the present invention, the second driving mechanism includes an ultrasonic vibration generator fixed on the top of the protective cylinder and a vibration transfer plate suspended in the protective cylinder, the vibration output end of the ultrasonic vibration generator abuts against the vibration transfer plate, and both ends of the vibration transfer plate are fixed with a third spring for suspension; the second driving mechanism also includes a plurality of vibration transfer rings equidistantly arranged outside the extrusion cylinder, the outer surface of the vibration transfer ring abuts against the vibration transfer plate, and the inner surface of the vibration transfer ring is fixedly connected to the second spring.

[0017] The present invention also provides an extrusion puffing method for producing pet food, comprising the following steps:

[0018] S1. The raw materials for producing pet food are moved and extruded in the extrusion cylinder through the feeding screw;

[0019] S2, driving the wedge-shaped extrusion block to move toward the center of the extrusion cylinder through the first driving mechanism to perform auxiliary extrusion on the raw material;

[0020] In the process of the wedge-shaped extrusion block moving toward the center of the extrusion cylinder, as the steam delivery hole of the wedge-shaped driving block is aligned with the steam inlet of the wedge-shaped extrusion block to connect the steam delivery channel, steam is injected into the raw material, thereby performing extrusion puffing to produce pet food.

[0021] The beneficial effects of the present invention are:

[0022] 1. The present invention increases the extrusion area and extrusion force of the raw material by arranging multiple wedge-shaped extrusion blocks that can move toward the center of the extrusion cylinder. Compared with the traditional extrusion from a single direction, multiple wedge-shaped extrusion blocks that move toward the center can apply pressure to the raw material from multiple directions at the same time, providing a more uniform extrusion effect, thereby improving the extrusion and puffing effect. The telescopic function of the wedge-shaped extrusion block can realize dynamic extrusion of the raw material, which is helpful to improve the uniformity and fluidity of the raw material. At the same time, the steam injection component is integrated on the wedge-shaped extrusion block, so that the steam can be evenly distributed in the raw material and can penetrate into the interior of the raw material.

[0023] 2. The present invention provides a feeding component, and additives can be added to the raw materials during the extrusion and puffing process to improve the quality of the feed, increase the nutritional value or meet specific production needs. In addition, the feeding component is automatically driven to move during the movement of the wedge-shaped extrusion block toward the center of the extrusion cylinder, thereby realizing quantitative feeding of the feeding component.

[0024] 3. The present invention integrates a sensor on the wedge-shaped extrusion block so that the sensor can extend into the interior of the raw material to improve the accuracy of monitoring. By integrating a temperature control component on the wedge-shaped extrusion block, the rod body plays the role of a stirring rod on the one hand, and on the other hand, a heating and cooling flow channel is integrated in the rod body, which can quickly heat and cool the raw material.

[0025] 4. The present invention sets a vibration unit and a second driving mechanism. The ultrasonic vibration of the second driving mechanism has a high energy density and frequency, which can quickly transfer the vibration energy to the raw materials in the extrusion cylinder. The vibrating convex-shaped vibration unit can stir the raw materials, promote uniform mixing and dispersion of the raw materials, improve the taste and nutritional value of the feed, and make the nutrients in the feed easier to absorb. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the extrusion cylinder structure of the present invention;

[0028] Figure 3 The wedge-shaped extrusion block structure of the present invention is schematically shown in FIG. Figure 1 ;

[0029] Figure 4 The wedge-shaped extrusion block structure of the present invention is schematically shown in FIG. Figure 2 ;

[0030] Figure 5 It is a schematic diagram of the connection between the first driving mechanism and the wedge-shaped extrusion block of the present invention;

[0031] Figure 6 It is a schematic diagram of the steam pipe structure of the present invention;

[0032] Figure 7 It is a schematic diagram of the structure of the feeding assembly of the present invention;

[0033] Figure 8 It is a schematic diagram of the structure of the temperature control component of the present invention;

[0034] Fig. 9 It is a schematic diagram of the connection between the second driving mechanism and the vibration unit of the present invention;

[0035] Fig.10 It is a schematic diagram of the structure of the vibration unit of the present invention;

[0036] Fig.11 It is a cross-sectional view of the vibration unit of the present invention on the extrusion cylinder.

[0037] In the figure:

[0038] 1. Extrusion cylinder; 2. Feeding screw; 3. Wedge-shaped extrusion block; 301. Support ear plate; 302. First spring; 303. Steam inlet; 304. Steam outlet; 305. Sensor; 306. Medium input pipe; 307. Medium output pipe; 308. Discharge port; 309. Storage tank; 4. First driving mechanism; 401. Mounting plate; 402. Wedge-shaped driving block; 403. Steam delivery hole; 404. Connecting hose; 405. Cylinder; 5. Protective cylinder; 6. Steam pipe fittings; 601. Ring pipe; 602. Branch pipe; 7. Feeding assembly; 701. Storage bin; 7 02. Feed pipe; 703. Follower; 704. Active member; 705. Transmission member; 706. First ratchet; 707. Rotating seat; 708. Second ratchet; 8. Temperature control assembly; 801. Frame; 802. Rod; 803. Medium inlet; 804. Medium outlet; 805. Electric push rod; 9. Vibration unit; 901. Ball seat; 902. Ball head; 903. Second spring; 904. Sealing ring; 10. Second driving mechanism; 1001. Ultrasonic vibration generator; 1002. Vibration transmission plate; 1003. Third spring; 1004. Vibration transmission circle. DETAILED DESCRIPTION

[0039] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0040] Embodiment 1

[0041] In order to solve the problem that the existing extrusion and puffing device only relies on the cooperation of the feeding screw 2 and the extrusion cylinder 1 to extrude the material, and generally extrude in a single direction, and the extrusion and puffing effect is not ideal, please refer to Figure 1-Figure 5 The present invention provides an extrusion puffing device for producing pet food, comprising an extrusion cylinder 1, a feeding screw 2 is arranged inside the extrusion cylinder 1, a plurality of wedge-shaped extrusion blocks 3 evenly distributed along the circumference are penetrated on the surface of the extrusion cylinder 1, a protective cylinder 5 is arranged outside the extrusion cylinder 1, and a first driving mechanism 4 for driving the wedge-shaped extrusion blocks 3 to move toward the center of the extrusion cylinder 1 is installed on the protective cylinder 5.

[0042] A support lug plate 301 is fixedly sleeved on the wedge-shaped extrusion block 3, and a first spring 302 for resetting the wedge-shaped extrusion block 3 is fixedly arranged between the support lug plate 301 and the extrusion cylinder 1. The first spring 302 is arranged so that the wedge-shaped extrusion block 3 can be retracted onto the extrusion cylinder 1 after extrusion, so as to avoid collision between the wedge-shaped extrusion block 3 and the feeding screw 2 during rotation.

[0043] The first driving mechanism 4 includes a mounting plate 401 slidably mounted on the inner wall of the protective cylinder 5 , a cylinder 405 for driving the mounting plate 401 to move is disposed at the end thereof, and a wedge-shaped driving block 402 matching the wedge-shaped extrusion block 3 is fixedly disposed on the mounting plate 401 .

[0044] In order to deliver steam to the center of the raw material more directly and efficiently and ensure that the steam can be evenly distributed in the raw material, such as Figure 3 , Figure 5-Figure 6 As shown, a steam inlet 303 is provided at the outer end of the wedge-shaped extrusion block 3, and a plurality of steam outlets 304 are provided at the inner end of the wedge-shaped extrusion block 3. The steam outlets 304 can be set to four and evenly distributed on the four sides of the wedge-shaped extrusion block 3; a steam delivery through hole 403 is provided on the wedge-shaped driving block 402, and the wedge-shaped driving block 402 moves to align the steam delivery through hole 403 with the steam inlet 303 to connect the steam delivery channel; a steam pipe 6 for supplying steam is also installed on the protective cylinder 5, and the steam pipe 6 includes an annular pipe 601 and a plurality of branch pipes 602, and a connecting hose 404 is provided between the branch pipe 602 and the steam delivery through hole 403. The steam in the annular tube 601 enters the connecting hose 404 through the branch pipe 602, and is then transported to the steam transport through hole 403 by the connecting hose 404. When the steam transport through hole 403 is aligned with the steam inlet 303, the steam in the steam transport through hole 403 enters the wedge-shaped extrusion block 3 through the steam inlet 303, and is finally injected into the raw material from multiple steam outlets 304. The steam injection component is integrated on the wedge-shaped extrusion block 3, so that the steam can be evenly distributed in the raw material and can penetrate into the inner center of the raw material. The wedge-shaped extrusion block 3 and the wedge-shaped driving block 402 are used to control the injection, avoiding the high installation cost and the easy-to-break controller components.

[0045] To improve feed quality, nutritional value or meet specific production needs, such as Figure 3-Figure 4 , Figure 7As shown, a feeding assembly 7 is also provided in the wedge-shaped extrusion block 3 located at the upper part of the extrusion cylinder 1. The feeding assembly 7 is used to automatically convey feed additives into the extrusion cylinder 1 as the wedge-shaped extrusion block 3 moves. Feed additives are added according to actual production needs, such as amino acids, vitamins, minerals, etc. During the extrusion and puffing process, additives are added to the feed to improve the quality of the feed, increase the nutritional value or meet specific production needs; the feeding assembly 7 includes a storage bin 701 and a feed delivery pipe 702 located at the bottom of the storage bin 701. An auger is provided in the feed delivery pipe 702. A driven member 703 for driving the auger to rotate is provided at the end of the auger. An active member 704 is rotatably provided, and a transmission member 705 is provided between the active member 704 and the driven member 703. The active member 704 and the driven member 703 can be set as gears or other suitable components. A first ratchet 706 is coaxially provided on the side of the active member 704; the feeding assembly 7 also includes a swivel seat 707 fixed on the outer surface of the protective cylinder 5, and a second ratchet 708 matching the first ratchet 706 is rotatably provided on the swivel seat 707, and the first ratchet 706 and the second ratchet 708 are both provided with ratchet claws and other components matching therewith; the wedge-shaped extrusion block 3 is provided with a storage tank 309 for installing the storage bin 701 and a discharge port 308 for discharging materials from the conveying pipe 702.

[0046] During the movement of the wedge-shaped extrusion block 3 toward the center of the extrusion cylinder 1, when the first ratchet 706 contacts the second ratchet 708, the second ratchet 708 does not rotate. At this time, the first ratchet 706 rotates, and the first ratchet 706 drives the active member 704 to rotate. The active member 704 drives the driven member 703 to rotate through the transmission member 705, and the driven member 703 drives the auger in the feeding pipe 702 to rotate, thereby adding the feed additives in the storage bin 701 to the raw materials in the extrusion cylinder 1; during the movement of the wedge-shaped extrusion block 3 away from the center of the extrusion cylinder 1, when the first ratchet 706 contacts the second ratchet 708, at this time, the second ratchet 708 rotates, and the first ratchet 706 does not rotate, so as to avoid the rotation of the auger in the feeding pipe 702; during the movement of the wedge-shaped extrusion block 3 toward the center of the extrusion cylinder 1, it automatically drives the feeding assembly 7 to move, and can realize the quantitative feeding of the feeding assembly 7.

[0047] The present invention also provides an extrusion puffing method for producing pet food, comprising the following steps:

[0048] S1, the raw materials for producing pet food are moved and extruded in the extrusion cylinder 1 through the feeding screw 2;

[0049] S2, driving the wedge-shaped extrusion block 3 to move toward the center of the extrusion cylinder 1 through the first driving mechanism 4 to perform auxiliary extrusion on the raw material;

[0050] In the process of the wedge-shaped extrusion block 3 moving toward the center of the extrusion cylinder 1, as the steam delivery through hole 403 of the wedge-shaped driving block 402 is aligned with the steam inlet 303 of the wedge-shaped extrusion block 3 to connect the steam delivery channel, steam is injected into the raw material;

[0051] When the wedge-shaped extrusion block 3 moves toward the center of the extrusion cylinder 1, the wedge-shaped extrusion block 3 drives the feeding assembly 7 to operate, and automatically delivers the feed additive into the extrusion cylinder 1, thereby performing extrusion and puffing of the pet food.

[0052] Embodiment 2

[0053] On the basis of Example 1, in order to solve the problem that the temperature and humidity of the raw materials in the existing extrusion and puffing device are not accurately monitored, and the temperature control of the raw materials is not convenient and efficient, as Figure 4 , Figure 8 As shown, a temperature control component 8 for cooling and heating raw materials is also provided in the wedge-shaped extrusion block 3, and the temperature control component 8 includes a frame 801 and an electric push rod 805 for driving the frame 801 to move; a plurality of rods 802 are fixedly provided on the frame 801, and the rods 802 pass through the inner end of the wedge-shaped extrusion block 3, and a medium inlet 803 and a medium outlet 804 are provided at the end of the rod 802, and a medium flow channel is provided inside the rod 802, and the medium flow channel can be serpentine, spiral or other suitable shapes to ensure that the medium can be evenly distributed in the rod 802, so as to achieve a more uniform cooling or heating effect on the entire rod 802. The frame 801 is driven to move by the electric push rod 805, and the frame 801 drives the rod 802 to extend out of the wedge-shaped extrusion block 3. By integrating the temperature control component 8 on the wedge-shaped extrusion block 3, the rod 802 plays the role of a stirring rod on the one hand, and during the extrusion process, it has an additional stirring effect on the raw materials, which helps to break up the agglomeration that may be formed in the raw materials during the extrusion process and make them mixed more evenly. On the other hand, a heating and cooling flow channel is integrated in the rod 802 to quickly heat and cool the raw materials.

[0054] A sensor 305 is embedded in the end of the wedge-shaped extrusion block 3 located inside the extrusion cylinder 1. The sensor 305 can be a temperature, humidity sensor, etc. The sensor 305 is integrated on the wedge-shaped extrusion block 3 so that the sensor 305 can extend into the raw material, thereby improving the accuracy of monitoring and monitoring key parameters such as temperature and humidity of the raw materials in real time, so as to promptly discover and deal with possible problems with the raw materials; a medium input pipe 306 and a medium output pipe 307 are provided at the end of the wedge-shaped extrusion block 3 located outside the extrusion cylinder 1. The medium input pipe 306 is connected to the medium inlet 803 of the multiple rod bodies 802 through a pipeline, and the medium output pipe 307 is connected to the medium outlet 804 of the multiple rod bodies 802 through a pipeline.

[0055] When in use, hot water or cold water is injected into the temperature control component 8 based on actual production needs, and hot water is injected into the medium flow channel through the medium input pipe 306. The heat is transferred to the rod body 802 to heat it up, thereby achieving the temperature increase of the raw materials in contact with the rod body 802. Cold water is injected into the medium flow channel through the medium input pipe 306 to absorb the heat of the rod body 802 and take it away, thereby achieving the cooling of the raw materials.

[0056] Embodiment 3

[0057] On the basis of the first and second embodiments, in order to solve the problems that when the material of the existing extrusion and expansion device flows in the barrel, the flow state is relatively stable, the material is easy to agglomerate, and it is easy to adhere to the barrel wall, which affects the continuous and efficient transportation, and the mixing degree between different components of the material is poor, as shown in the figure. Figure 1-Figure 2 , Figure 9-11 As shown, a plurality of vibration units 9 evenly distributed along the circumference are also provided on the surface of the extrusion cylinder 1, and a second driving mechanism 10 for driving the plurality of vibration units 9 to vibrate simultaneously is installed on the protective cylinder 5. The vibration unit 9 includes a ball seat 901 fixed on the extrusion cylinder 1 and a ball head 902 located in the ball seat 901; a second spring 903 is fixed on the outer end of the ball head 902, and a sealing ring 904 is provided between the ball seat 901 and the ball head 902. The second driving mechanism 10 drives the multiple vibration units 9 to vibrate at a high frequency. When the ball head 902 vibrates at a high frequency, it will continuously impact and disturb the surrounding raw materials for producing pet food, making the flow state of the raw materials in the extrusion cylinder 1 more complicated and chaotic, which helps to break the agglomeration of the raw materials and promote better mixing between different components, especially for some raw materials that are difficult to mix evenly, such as pet feed with added trace nutrients or drugs, it helps to form smaller and more uniform bubbles inside the raw materials, so that the puffed feed has a more delicate taste; the vibrating ball head 902 can also reduce the friction between the raw materials and the inner wall of the extrusion cylinder 1, so that the raw materials are transported more smoothly in the cylinder, and the production efficiency of the entire extrusion puffing device is improved.

[0058] The second driving mechanism 10 includes an ultrasonic vibration generator 1001 fixed on the top of the protective cylinder 5 and a vibration transfer plate 1002 suspended in the protective cylinder 5, the vibration output end of the ultrasonic vibration generator 1001 is in contact with the vibration transfer plate 1002, and both ends of the vibration transfer plate 1002 are fixed with a third spring 1003 for suspension; the second driving mechanism 10 also includes a plurality of vibration transfer rings 1004 equidistantly arranged outside the extrusion cylinder 1, the outer surface of the vibration transfer ring 1004 is in contact with the vibration transfer plate 1002, and the inner surface of the vibration transfer ring 1004 is fixedly connected to the second spring 903.

[0059] When in use, the ultrasonic vibration generator 1001 drives the vibration transfer plate 1002 to vibrate, the vibration transfer plate 1002 drives the multiple vibration transfer circles 1004 to vibrate, and the vibration transfer circles 1004 drive the ball head 902 to vibrate in the ball seat 901 through the second spring 903, so that the ultrasonic vibration with higher energy density and frequency of the second driving mechanism 10 can quickly act on the production materials.

[0060] The above-mentioned embodiment only expresses one implementation mode of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. An extrusion puffing device for producing pet food, comprising an extrusion cylinder (1), characterized in that: A feeding screw (2) is provided inside the extrusion cylinder (1), a plurality of wedge-shaped extrusion blocks (3) are evenly distributed along the circumference and are penetrated on the surface of the extrusion cylinder (1), a protective cylinder (5) is provided outside the extrusion cylinder (1), and a first driving mechanism (4) for driving the wedge-shaped extrusion blocks (3) to move toward the center of the extrusion cylinder (1) is installed on the protective cylinder (5); The outer end of the wedge-shaped extrusion block (3) is provided with a steam inlet (303), and the inner end of the wedge-shaped extrusion block (3) is provided with a plurality of steam outlets (304); The first driving mechanism (4) comprises a mounting plate (401) slidably mounted on the inner wall of the protective cylinder (5); a wedge-shaped driving block (402) matching the wedge-shaped extrusion block (3) is fixedly mounted on the mounting plate (401); a steam conveying through hole (403) is disposed on the wedge-shaped driving block (402); the wedge-shaped driving block (402) moves so that the steam conveying through hole (403) is aligned with the steam inlet (303) to connect the steam conveying channel.

2. The extrusion puffing device for producing pet food according to claim 1, characterized in that: A support ear plate (301) is fixedly sleeved on the wedge-shaped extrusion block (3), and a first spring (302) for returning the wedge-shaped extrusion block (3) is fixedly arranged between the support ear plate (301) and the extrusion cylinder (1); The end of the mounting plate (401) is provided with a cylinder (405) for driving the mounting plate (401) to move.

3. The extrusion puffing device for producing pet food according to claim 1, characterized in that: A steam pipe (6) for supplying steam is also installed on the protective cylinder (5), and the steam pipe (6) comprises an annular pipe (601) and a plurality of branch pipes (602), and a connecting hose (404) is provided between the branch pipe (602) and the steam conveying through hole (403).

4. The extrusion puffing device for producing pet food according to claim 1, characterized in that: A feeding assembly (7) is also provided in the wedge-shaped extrusion block (3) located at the upper part of the extrusion cylinder (1), and the feeding assembly (7) is used to automatically convey feed additives into the extrusion cylinder (1) as the wedge-shaped extrusion block (3) moves; The feeding assembly (7) comprises a storage bin (701) and a feeding pipe (702) located at the bottom of the storage bin (701), an auger is arranged in the feeding pipe (702), a driven member (703) for driving the auger to rotate is arranged at the end of the auger, a driving member (704) is rotatably arranged on the side of the storage bin (701), a transmission member (705) is arranged between the driving member (704) and the driven member (703), and a first ratchet (706) is coaxially arranged on the side of the driving member (704); The feeding assembly (7) further comprises a swivel seat (707) fixed on the outer surface of the protective cylinder (5), and a second ratchet (708) matching the first ratchet (706) is rotatably provided on the swivel seat (707); The wedge-shaped extrusion block (3) is provided with a storage tank (309) for installing the storage bin (701) and a discharge port (308) for discharging materials from the conveying pipe (702).

5. The extrusion puffing device for producing pet food according to claim 1, characterized in that: A temperature control component (8) for cooling the heated raw material is also provided in the wedge-shaped extrusion block (3), and the temperature control component (8) comprises a frame (801) and an electric push rod (805) for driving the frame (801) to move; A plurality of rods (802) are fixedly arranged on the frame (801), the rods (802) penetrate the inner end of the wedge-shaped extrusion block (3), the ends of the rods (802) are provided with a medium inlet (803) and a medium outlet (804), and a medium flow channel is arranged inside the rods (802).

6. The extrusion puffing device for producing pet food according to claim 5, characterized in that: A sensor (305) is embedded in the end of the wedge-shaped extrusion block (3) located inside the extrusion cylinder (1), and a medium input pipe (306) and a medium output pipe (307) are provided at the end of the wedge-shaped extrusion block (3) located outside the extrusion cylinder (1). The medium input pipe (306) is connected to the medium inlet (803) of the plurality of rod bodies (802) through a pipeline, and the medium output pipe (307) is connected to the medium outlet (804) of the plurality of rod bodies (802) through a pipeline.

7. The extrusion puffing device for producing pet food according to claim 1, characterized in that: A plurality of vibration units (9) evenly distributed along the circumference are also provided on the surface of the extrusion cylinder (1), and a second driving mechanism (10) for driving the plurality of vibration units (9) to vibrate simultaneously is installed on the protective cylinder (5).

8. The extrusion puffing device for producing pet food according to claim 7, characterized in that: The vibration unit (9) comprises a ball seat (901) penetrating and fixed on the extrusion cylinder (1) and a ball head (902) located in the ball seat (901); A second spring (903) is fixedly provided at the outer end of the ball head (902), and a sealing ring (904) is provided between the ball seat (901) and the ball head (902).

9. The extrusion puffing device for producing pet food according to claim 8, characterized in that: The second driving mechanism (10) comprises an ultrasonic vibration generator (1001) fixed on the top of the protective cylinder (5) and a vibration transmission plate (1002) suspended in the protective cylinder (5), the vibration output end of the ultrasonic vibration generator (1001) abuts against the vibration transmission plate (1002), and third springs (1003) for suspension are fixedly provided at both ends of the vibration transmission plate (1002); The second driving mechanism (10) further comprises a plurality of vibration transfer rings (1004) which are equally spaced and sleeved outside the extrusion cylinder (1); the outer surface of the vibration transfer ring (1004) abuts against the vibration transfer plate (1002); and the inner surface of the vibration transfer ring (1004) is fixedly connected to the second spring (903).

10. An extrusion puffing method for producing pet food, using an extrusion puffing device for producing pet food according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Raw materials for producing pet food are moved and extruded in an extrusion cylinder (1) via a feeding screw (2); S2, driving the wedge-shaped extrusion block (3) to move toward the center of the extrusion cylinder (1) through the first driving mechanism (4) to perform auxiliary extrusion on the raw material; In the process of the wedge-shaped extrusion block (3) moving toward the center of the extrusion cylinder (1), as the steam delivery hole (403) of the wedge-shaped driving block (402) is aligned with the steam inlet (303) of the wedge-shaped extrusion block (3) to connect the steam delivery channel, steam is injected into the raw material, thereby performing extrusion puffing to produce pet food.

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