Animal raw material processing waste separation and extraction process and used device

Abstract

The invention discloses a process for separating and extracting animal raw material processing wastes and a device used by the process. The process comprises the following process steps in sequence: squeezing chicken powder and / or duck meat powder, putting the squeezed chicken powder and / or duck meat powder into a stock bin, cooking, sterilizing, cooling, crushing, packaging and delivering; in the squeezing procedure, part of the materials temporarily stay on the screen frame in the conveying process, and after staying, the materials are secondarily squeezed in the continuous conveying process so as to enhance the filtering effect of the local section of the screen frame. The device is composed of a screw press rack, a driving system and a screw press solid-liquid separation system, the screw press solid-liquid separation system is composed of a feeding bin, a screw auger, a deslagging cone and a pneumatic material blocking device which are sequentially arranged, and the screw auger is wrapped with a screen frame; a juice receiving tank fixedly connected to the rack is arranged below the screen frame; a plurality of expanding sections are arranged on a screen frame of the screw press at intervals in the material conveying direction. According to the invention, the filtering effect of materials with moisture on the screen frame is enhanced, and the filtering efficiency is improved.

Description

Technical Field

[0001] The invention relates to general crushing, grinding or pulverizing; in particular, it relates to a process for separating and extracting animal raw material processing waste and a device used therein. Background Art

[0002] In addition to being directly processed into food, animal raw materials can also be further processed into a variety of products with important economic significance, such as fish meal, meat and bone meal, bone meal, oil residue meal, animal fat, bone fat, blood meal, feather meal, etc. These products are widely used in the compound feed industry as excellent animal protein feed and have very important economic significance.

[0003] After animal raw material processing waste is crushed and heated, it is separated into solid and liquid by a screw press or a horizontal screw separator. The separated solid phase material is dried and crushed to obtain animal powder, which can be directly used in compound feed. Liquid phase separation is mostly done by automatic degumming centrifuge to obtain grease, colloid and wastewater. Grease needs to be further separated to meet the corresponding quality requirements. In the process of solid-liquid separation, that is, squeezing and conveying of animal raw material processing waste by a screw press, the squeezing effect still needs to be improved.

[0004] Patent with publication number CN109291488A: An automatically adjustable waste extrusion device, which is provided with a squeezing screw and a cone, is easy to install, and the cone moves to the right to increase the material pressure at the discharge port, improve the material squeezing effect, and automatically control the cone to apply different resistances to the material according to the different properties of the material, so as to obtain the ideal material squeezing effect, with a simple structure, safe and reliable. It only sets a cone at the discharge port, and the squeezing and conveying process actually covers the entire conveying stroke of the screw press, so the squeezing effect can only be improved in the local area close to the discharge port.

[0005] The patent with announcement number CN207643777U: A screw press, its background mentions: Since the pulp residue inevitably has a certain circular motion during the conveying process of the screw shaft, this will shorten the filtering time of the pulp residue on the screen frame, affecting the dehydration effect, and even failing to achieve the dryness required by the customer. In order to enhance the dehydration effect, that is, the squeezing effect, the desired dehydration effect (that is, the squeezing effect) is achieved by changing the rotation speed of the squeezing screw, that is, by changing (specifically reducing) the rotation speed, that is, ensuring (increasing) the filtering time, but this will inevitably lead to a decrease in squeezing efficiency. Summary of the invention

[0006] The purpose of the present invention is to overcome the defects existing in the prior art and provide a process for separating and extracting animal raw material processing waste. Due to the increase in the speed of the spiral auger, the centrifugal force of the material with moisture is increased, and the filtering effect of the material with moisture on the screen frame is enhanced, and the increase in the speed of the spiral auger also improves the filtering efficiency. The centrifugal force is increased by increasing the speed of the screw press, and the centrifugal force is used to greatly improve the centrifugal force of the spiral auger, and no bearing is set at the discharge end. Appropriately increasing the local diameter of the screen frame can increase the filtering time of the material with moisture, and enhance the filtering effect from the perspective of increasing the filtering time.

[0007] To achieve the above purpose, the technical solution of the present invention is to design a process for separating and extracting animal raw material processing waste, which is composed of the following process steps in sequence: squeezing chicken powder and / or duck powder and then putting it into the silo, steaming and sterilizing, cooling, crushing, packaging and shipping; the speed of the screw press used in the above squeezing process is 40~90r / min; in the above squeezing process, part of the material stays on the screen frame for a short time during the conveying process, and after staying, it is squeezed twice during the continuous conveying process of the material to enhance the filtering effect of the local section of the screen frame. Generally speaking, for materials with a high oil content, the spindle speed should be reduced to avoid excessive squeezing and affect production efficiency. If different materials are squeezed, corresponding adjustments need to be made according to the different properties of the materials. However, this process design adopts a higher speed than the conventional speed. Due to the increase in the speed of the spiral auger, the centrifugal force of the water-containing material is increased (so that the water-containing material is thrown onto the screen frame more quickly and forcefully), and the filtering effect of the water-containing material on the screen frame is enhanced, and the increase in the speed of the spiral auger also improves the filtering efficiency. By increasing the speed of the screw press to increase the centrifugal force, the centrifugal force is used to greatly improve the centrifugal auger's centrifugality. No bearing is set at the discharge end. Since the material moves forward around the screw shaft during the operation of the screw press, the screw shaft can be automatically centered, and the radial force acting on the screen frame can be evenly distributed. In conjunction with the setting of the screen frame structure (appropriately increase the diameter of the screen frame in the local area, so that the screen frame has a small large diameter section at a certain distance in the length direction, that is, the material conveying direction, that is, a large capacity section with a small distance, so that the material stays in the conveying process appropriately. Due to the setting of the interval large diameter section, the material staying in the large diameter section is squeezed twice during the conveying process, so the filtering effect of the local section is strengthened), the filtering time of the material with moisture can be increased, and the filtering effect can be strengthened from the perspective of increasing the filtering time; on the other hand, due to the increase in the speed of the screw auger, the centrifugal force of the material with moisture is increased (so that the material with moisture is thrown onto the screen frame more quickly and forcefully), and the filtering effect of the material with moisture on the screen frame is strengthened, and the increase in the speed of the screw auger also improves the filtering efficiency.

[0008] In the pressing process, the material is fed and conveyed by screw pressing. The dehydrated material is pushed open by the pneumatic material blocking device under the continuous conveying of the screw auger and discharged from the discharge port, and the moisture squeezed out of the material is discharged.

[0009] A further technical solution is that in the pressing process, the material is pushed forward around the screw shaft to realize automatic centering of the screw shaft so that the radial force acting on the screen frame is evenly distributed. The automatic centering of the screw auger is realized by using centrifugal force and the spiral motion and propulsion motion of the material around the screw auger, and the radial force on the screen frame is evenly distributed, so that the pressing of the entire screw press is uniform, and the vibration of the equipment, the loss of components in the equipment, and the service life of the equipment are improved.

[0010] The technical solution also provided by the present invention is a device for separating and extracting animal raw material processing waste, which is composed of a screw press frame, a drive system and a screw press solid-liquid separation system. The drive system is composed of a drive motor and a reducer fixedly connected to the frame, and the drive motor is connected to the reducer; the screw press solid-liquid separation system is composed of a feed bin, a screw auger, a slag discharge cone and a pneumatic material blocking device arranged in sequence, the screw shaft in the middle of the screw auger is fixedly connected to the output shaft of the reducer, the screw auger is covered with a screen frame, and the screen frame is fixedly connected to the frame; a juice receiving trough fixedly connected to the frame is arranged below the screen frame; the screen frame of the screw press is provided with a plurality of expansion sections at intervals along the conveying direction of the material; the screw shaft of the screw press is rotatably connected to the screw press frame only at the feed end through a bearing; The vertical cross-section shape of the screen frame expansion section passing through the rotation axis is composed of two oblique lines and a curve with a smooth transition between the two oblique lines. The two oblique lines are a large slope section and a small slope section in the conveying direction, and the length of the large slope section is shorter than that of the small slope section. The screen frame is provided with a number of support plates arranged at intervals. The support plates are located below the spiral auger. The support plates are curved plates and their shapes are arranged in the same shape as the outer shape of the spiral auger. There is a distance between the support plates and the outer wall of the spiral auger. The setting of the pneumatic material blocking device can play a role in pressure regulation. The diameter of the screen frame is appropriately increased locally, so that the screen frame has a small large diameter section at intervals in the length direction, that is, the material conveying direction, that is, a large capacity section at a small distance, so that the material residence time during the conveying process is appropriately increased (that is, the filtration time is increased), and due to the setting of the interval large diameter section, the material staying in the large diameter section is squeezed twice during the conveying process, so the filtering effect of the local section is strengthened, and because the screen frame of the screw press is provided with a number of expansion sections at intervals along the material conveying direction, this structural setting covers the entire squeezing and conveying process of the entire screw press, which can truly strengthen the squeezing effect (or dehydration effect).

[0011] A further technical solution is that a plurality of spaced support plates are provided on the screen frame, the support plates are located below the spiral auger, the support plates are curved plates and their shape is contoured to the shape of the spiral auger, and there is a distance between the support plates and the outer wall of the spiral auger.

[0012] A further technical solution is that an elastic sponge is fixed on the upper surface of the support plate, and a wear-resistant layer is coated on the surface of the elastic sponge; the distance between the wear-resistant layer and the spiral auger matches the radial clearance of the spiral shaft. This arrangement can prevent the support plate or the wear-resistant layer from causing the spiral auger to be subjected to excessive force and accelerate its wear when the spiral auger jumps, and the elastic sponge can still play a role in correcting the centering of the spiral auger when the spiral auger jumps, and can also enhance the filtering effect when the spiral auger jumps due to the support plate, elastic sponge and wear-resistant layer.

[0013] The advantages and beneficial effects of the present invention are as follows: the process design adopts a higher speed than the conventional speed. Due to the increase in the speed of the spiral auger, the centrifugal force of the material with moisture is increased (so that the material with moisture is thrown onto the screen frame more quickly and forcefully), and the filtering effect of the material with moisture on the screen frame is enhanced, and the increase in the speed of the spiral auger also improves the filtering efficiency. By increasing the speed of the screw press to increase the centrifugal force, the centrifugal force is used to greatly improve the centering of the spiral auger. No bearing is set at the discharge end. Since the material is pushed forward around the spiral shaft during the operation of the screw press, the spiral shaft can be automatically centered, and the radial force acting on the screen frame can also be evenly distributed. In conjunction with the setting of the screen frame structure (properly increasing the local diameter of the screen frame so that a small large-diameter section appears at intervals in the length direction of the screen frame, which is also the conveying direction of the material, that is, a large-capacity section appears at a small distance, so that the residence time of the material during the conveying process is appropriately increased, and due to the setting of the interval large-diameter sections, the material staying in the large-diameter section is squeezed twice during the conveying process, thereby enhancing the filtration effect of the local section), the filtration time of the material with moisture can be increased, and the filtration effect can be enhanced from the perspective of increasing the filtration time; on the other hand, due to the increase in the speed of the spiral auger, the centrifugal force of the material with moisture is increased (so that the material with moisture is thrown onto the screen frame more quickly and forcefully), thereby enhancing the filtration effect of the material with moisture on the screen frame, and the increase in the speed of the spiral auger also improves the filtration efficiency.

[0014] The automatic centering of the spiral auger is achieved by utilizing centrifugal force and the spiral and propulsion movements of the materials around the spiral auger. This can also ensure uniform distribution of radial force on the screen frame, making the pressing uniform throughout the pressing and conveying stroke of the screw press. It can also avoid vibration of the equipment, avoid loss of components in the equipment, and increase the service life of the equipment.

[0015] Since a number of expanded diameter sections are arranged at intervals on the screen frame of the screw press along the conveying direction of the material, this structural setting covers the entire pressing and conveying process of the screw press, and can truly enhance the pressing effect (or dehydration effect). BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of a first embodiment of a device for separating and extracting animal raw material processing wastes according to the present invention; Figure 2 yes Figure 1 A partial enlarged schematic diagram of the middle screen frame; Figure 3 yes Figure 1 Schematic diagram from another perspective; Figure 4 yes Figure 1 A top view of Figure 5 yes Figure 4 A partial enlarged schematic diagram of the middle feed bin and its nearby components; Figure 6 yes Figure 5 A longitudinal section of Figure 7 yes Figure 6 A partial enlarged schematic diagram of the middle spiral auger and its surrounding parts; Figure 8 is a schematic diagram of a second embodiment of the present invention; Fig. 9 yes Figure 8 A partial enlarged schematic diagram of the spiral blade of the mid-screw auger; Fig.10 yes Fig. 9 An enlarged schematic diagram of the middle expansion section; Fig.11 yes Fig. 9 A partial enlarged schematic diagram of the spiral blade of the mid-screw auger; Fig.12 is a schematic diagram of Embodiment 3 of the present invention; Fig.13 yes Fig.12 a cross-sectional view of a top view of the middle bracket; Fig.14 is a schematic diagram of a fourth embodiment of the present invention; Fig.15 yes Fig.14 A magnified schematic diagram of the middle right end; Fig.16 yes Fig.14 Cross-section of Fig.17 yes Fig.16 An enlarged schematic diagram of the right end of ; Fig.18 yes Fig.17Left side view of the intermediate pressure plate and base.

[0017] In the figure: 1. screw shaft; 2. screen frame; 3. frame; 4. drive motor; 5. reducer; 6. feed bin; 7. spiral auger; 8. slag cone; 9. pneumatic material blocking device; 10. juice collecting trough; 11. bearing; 12. support plate; 13. oblique line; 14. curve; 15. elastic sponge; 16. wear-resistant layer; 17. piston rod; 18. material blocking plate; 19. bracket; 20. cylinder; 21. connecting rod; 22. pressure sensor; 23. flow sensor; 24. spring; 25. connecting rope; 26. movable pulley; 27. rope; 28. fixed seat; 29. ​​second fixed pulley; 30. third fixed pulley; 31. lever; 32. pressure plate; 33. base. DETAILED DESCRIPTION

[0018] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0019] Embodiment 1: Figures 1 to 7 As shown, the present invention is a process for separating and extracting animal raw material processing waste, and its process flow is: purchased chicken powder and / or duck meat powder (or chicken and / or duck meat raw material processing waste is crushed and heated, and then solid-liquid separation is carried out with a screw press, and the separated solid phase material is dried and crushed to obtain chicken powder and duck meat powder)---secondary pressing (squeezing out excess oil and fat to increase the protein content) (the "secondary pressing" here is different from the "secondary pressing of water-containing materials through the slag cone 8" mentioned later. The "secondary pressing" here is relative to the process of squeezing animal raw material processing waste into meat powder, which is the second pressing), feeding bin--steaming and sterilization--cooling with a cooler--crushing---packing and shipping (previously ton-bag packaging, now changed to small-bag packaging). In the aforementioned pressing process, part of the material stays on the screen frame for a short time during the conveying process, and after staying, it is squeezed for a second time during the continuous conveying process of the material to enhance the filtering effect of the local section of the screen frame. In the pressing process, the material is pushed forward around the screw shaft 1 to achieve automatic centering of the screw shaft so that the radial force acting on the screen frame 2 is evenly distributed.

[0020] A device for separation and extraction of animal raw material processing waste, comprising a screw press frame 3, a drive system and a screw press solid-liquid separation system, wherein the drive system comprises a drive motor 4 and a reducer 5 fixedly connected to the frame 3, wherein the drive motor 4 is connected to the reducer 5; the screw press solid-liquid separation system comprises a feed bin 6, a screw auger 7, a slag discharge cone 8 and a pneumatic material blocking device 9 arranged in sequence, wherein a screw shaft 1 in the middle of the screw auger 7 is fixedly connected to the output shaft of the reducer 5, a screen frame 2 is provided on the outer surface of the screw auger 7, and the screen frame 2 is fixedly connected to the frame 3; a juice receiving trough 10 fixedly connected to the frame 3 is arranged below the screen frame 2; the screen frame 2 of the screw press is provided with a plurality of expansion sections at intervals along the conveying direction of the material; the screw shaft 1 of the screw press is only rotatably connected to the screw press frame 3 at the feed end through a bearing 11. The slag discharge cone 8 is provided with a through hole for the screw shaft of the screw auger to pass through.

[0021] Embodiment 2: The difference from Embodiment 1 is that Figures 8 to 11 As shown, the diameter of the screen frame is appropriately increased locally, and the vertical cross-section shape of the enlarged diameter section of the screen frame 2 passing through the rotation axis is composed of two oblique lines 13 and a curve 14 with a smooth transition between the two oblique lines. The two oblique lines are respectively a large slope section and a small slope section along the conveying direction, and the length of the large slope section is smaller than the length of the small slope section. After such a setting, the material rotated and pushed by the spiral auger 7 stops appropriately when it reaches the diameter expansion section of the screen frame 2 of the screw press, and then as the spiral auger continues to rotate, the material staying in the diameter expansion section smoothly leaves the stop and continues to be pushed and transported. The screen frame 2 is provided with a plurality of spaced support plates 12, which are located below the spiral auger 7. The support plates are curved plates and their shape is similar to the shape of the spiral auger 7. There is a distance between the support plates and the outer wall of the spiral auger 7. An elastic sponge 15 is fixedly arranged on the upper surface of the support plate, and a wear-resistant layer is coated on the surface of the elastic sponge 15; the distance between the wear-resistant layer 16 and the spiral auger 7 matches the radial clearance of the screw shaft 1. The distance between the support plate and the spiral auger is relatively large, an elastic sponge is fixedly arranged on the upper surface of the support plate, and a wear-resistant layer is arranged on the surface of the elastic sponge; the distance between the wear-resistant layer and the spiral auger matches the runout clearance (radial clearance) of the spiral shaft; (this arrangement can avoid the support plate or the wear-resistant layer causing the spiral auger to be subjected to excessive force and accelerate its wear when the spiral auger jumps, and the elastic sponge can still play a role in correcting the centering of the spiral auger when the spiral auger jumps, and on the other hand, the support plate, elastic sponge and wear-resistant layer can enhance the filtering effect when the spiral auger jumps).

[0022] Embodiment 3: The difference from Embodiment 1 is that Fig.12 , Fig.13As shown, the spiral shaft 1 of the spiral auger is rotatably arranged (also rotatably arranged relative to the bracket 19 of the pneumatic material blocking device; the bracket 19 of the pneumatic material blocking device is fixedly connected to the frame 3), the piston rod 17 of the two cylinders 20 of the pneumatic material blocking device is fixedly connected to the material blocking plate 18, the material blocking plate is slidably arranged on the bracket 19, and the sliding direction is consistent with the material pushing and conveying direction, the material blocking plate 18 is fixedly connected with a connecting rod 21 on the side facing the slag discharge cone 8, and the end of the connecting rod 21 facing the slag discharge cone 8 is fixedly connected to the slag discharge cone 8, and the side wall of the exposed end of the piston rod is fixedly connected with a pressure sensor 22, and a flow sensor 23 is provided below the screen frame 2 near the slag discharge cone 8 for detecting the dehydration of the material blocked by the slag discharge cone 8 and squeezed for the second time. The pressure sensor 22 detects the stress condition of the slag cone; the flow sensor 23 detects the drainage flow rate of the squeezed material; this setting method, no matter what type and moisture content of the material, only needs to combine the detected several groups of different pressure conditions and the drainage flow rate of the squeezed material (manual observation or manual contact and squeezing to check the condition of the discharged material) to know the stress of the slag cone of the corresponding material that meets the dehydration condition. This greatly reduces the process of adjusting the pressure of the pneumatic material blocking device for different materials (especially the prior art calculates the required secondary pressing, that is, the pressure of the slag cone 8 on the material according to the different moisture contents of different materials and the required dehydration rates, and then often needs to be adjusted again after actual operation. This setting is equivalent to closed-loop control, which is directly adjusted according to the drainage flow rate and pressure conditions. It is much more convenient and faster than the adjustment process of the prior art, reduces the time consumption of the adjustment process, and improves the efficiency of the adjustment). At the beginning, the cylinder presses against the material blocking plate 18. When the material is squeezed out of the slag cone 8 due to the action of the spiral auger, the material blocking plate 18 squeezes the pressure sensor 22. The force condition of the slag cone detected by the pressure sensor 22 and the drainage flow rate of the squeezed material detected by the flow sensor 23 are combined with the discharge of the material to know whether to supply air to the cylinder or exhaust the air and the speed of the air intake or exhaust. After adjustment, appropriate adjustments are made according to the conditions reflected by the pressure sensor and the flow sensor (of course, the dehydration condition can be determined only based on the conditions detected by the flow sensor. The pressure sensor is to ensure that there is no abnormality in the machine - such as the flow sensor detecting a signal even though there is no pressure {if this is the case, the worker will clearly know that there is a fault on site, either the flow sensor is abnormal, or the equipment parameters are not set properly, resulting in premature and complete dehydration. In this way, the desired dehydration rate cannot be achieved, making the secondary squeezing of the slag cone 8 meaningless, so the worker needs to immediately adjust the equipment parameters or check the condition of the flow sensor}).

[0023] Embodiment 4: The difference from Embodiment 1 is that Figures 14 to 18As shown, the material blocking device is no longer a pneumatic material blocking device. The material blocking device includes a material blocking plate 18 fixedly connected to the bracket 19 of the material blocking device. The side of the material blocking plate 18 facing the slag discharge cone 8 is connected to the slag discharge cone 8 through a spring 24. The slag discharge cone 8 is provided with a through hole for the spiral shaft of the spiral auger to pass through. The side of the slag discharge cone 8 away from the drive motor 4 is fixedly connected with a connecting rope 25. The other end of the connecting rope 25 is wrapped around a fixed pulley and then fixedly connected to the shaft seat of a movable pulley 26. The wheel body of the movable pulley is fixedly connected to the wheel axle, and the wheel axle rotation device Placed on the axle seat, one end of the rope 27 wrapped around the wheel body of the movable pulley 26 is fixedly connected to the fixed seat 28, and the other end is fixedly connected to one end of the lever 31 of the lever mechanism after passing through the movable pulley 26, the second fixed pulley 29 and the third fixed pulley 30 in sequence. This end of the lever is closer to the fulcrum of the lever mechanism. The other end of the lever is located below the pressure plate 32, and the pressure plate is hinged on the base 33, and the base is fixedly connected to the frame 3. The base 33 and the pressure plate 32 are connected by a spring, and a long slot-shaped through hole is provided in the middle of the connecting rope 25 for the rope 27 to pass through.

[0024] In the process of the prior art, the dehydrated material pushes open the pneumatic material blocking device under the continued conveyance of the spiral auger and is discharged from the discharge port. In a short period of time after the slag cone is squeezed out, the force on the subsequent moisture-containing material suddenly decreases, so the discharge cannot ensure a relatively uniform dehydration rate. In addition, during the whole process, the pneumatic material blocking device is pushed open, closed, and pushed open again, which makes it very troublesome to monitor the pressure of the pneumatic material blocking device. The pneumatic material blocking device is repeatedly pushed open and closed, which makes a lot of noise and vibration when the device is running. After the present embodiment is so configured, when the material is squeezed and dehydrated more completely, the water flow rate is large, and the pressure plate 32 is pressed down by the impact of the water flow, so that one end of the lever 31 is pressed and the other end is lifted, thereby driving the rope 27, thereby driving the movable pulley 26 to move upward, thereby driving the slag cone 8 to move away from the drive motor 4, and gradually opening the discharge port at the slag cone 8 (as is known in the art, the slag cone 8 and the discharge barrel are slidably arranged, and the discharge port is opened when the slag cone 8 moves away from the discharge barrel); when the dehydration effect is not good, the water flow rate decreases, and the pressure plate 32 is not as low as before due to the action of the spring, and is appropriately lifted, so that the slag cone 8 is appropriately close to the discharge barrel (that is, close to the direction of the drive motor 4), and the discharge port is opened less, forming a greater pressure on the material to enhance the dehydration effect. After such setting, the dehydration flow rate is used to determine how much pressure the slag cone 8 should give to the material, and it will no longer open instantly, which can ensure a relatively uniform dehydration rate of the discharge material. Closing and opening are both gradual processes with low noise and less vibration.

[0025] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A process for separating and extracting animal raw material processing waste, characterized in that: The method comprises the following process steps which are performed in sequence: chicken meal and / or duck meal are squeezed and then put into a silo, steamed and sterilized, cooled, crushed, packaged and shipped; the rotation speed of the screw press used in the above-mentioned squeezing process is 40-90r / min; in the above-mentioned squeezing process, part of the material stays on the screen frame for a short time during the conveying process, and after staying, it is squeezed for a second time during the continuous conveying process of the material to enhance the filtering effect of the local section of the screen frame.

2. The process for separating and extracting animal raw material processing waste according to claim 1, characterized in that: In the pressing process, the material is pushed forward around the screw shaft to achieve automatic centering of the screw shaft so that the radial force acting on the screen frame is evenly distributed.

3. A device for separating and extracting animal raw material processing waste, characterized in that: It is composed of a screw press frame, a driving system and a screw press solid-liquid separation system. The driving system is composed of a driving motor and a reducer fixedly connected to the frame, and the driving motor is connected to the reducer; the screw press solid-liquid separation system is composed of a feed bin, a screw auger, a slag discharge cone and a pneumatic material blocking device arranged in sequence, the screw shaft in the middle of the screw auger is fixedly connected to the output shaft of the reducer, the screw auger is covered with a screen frame, and the screen frame is fixedly connected to the frame; a juice receiving trough fixedly connected to the frame is arranged below the screen frame; the screen frame of the screw press is provided with several expansion sections at intervals along the conveying direction of the material; the screw shaft of the screw press is rotatably connected to the screw press frame only at the feed end through a bearing; The vertical cross-section shape of the screen frame expansion section passing through the rotation axis is composed of two oblique lines and a curve with a smooth transition between the two oblique lines. The two oblique lines are a large slope section and a small slope section in the conveying direction, and the length of the large slope section is shorter than that of the small slope section. A plurality of support plates arranged at intervals are arranged on the screen frame. The support plates are located below the spiral auger. The support plates are curved plates and their shapes are arranged in the same shape as the outer shape of the spiral auger. A distance is set between the support plates and the outer wall of the spiral auger.

4. The device for separating and extracting animal raw material processing waste according to claim 3, characterized in that: The screen frame is provided with a plurality of support plates which are arranged at intervals. The support plates are located below the spiral auger. The support plates are curved plates and their shapes are arranged in the same shape as the outer shape of the spiral auger. There is a distance between the support plates and the outer wall of the spiral auger.

5. The device for separating and extracting animal raw material processing waste according to claim 4, characterized in that: An elastic sponge is fixedly arranged on the upper surface of the support plate, and a wear-resistant layer is covered on the surface of the elastic sponge; the distance between the wear-resistant layer and the spiral auger matches the radial clearance of the spiral shaft.

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