Wastewater filtering and purifying equipment for pet food processing

Abstract

The invention relates to the technical field of purification equipment, and particularly discloses wastewater filtration and purification equipment for pet food processing, which comprises a box body, the box body is vertically placed, the upper end of the box body is fixedly connected with an upper cover plate through bolts, and the position, close to the lower end, of the annular outer surface of the box body is fixedly connected with an inlet pipe; the outer surface of the upper end of the box body is connected with a discharge pipe, and a filter screen and a filter element for filtering are arranged in the box body; the outer surface of the lower end of the filter screen is rotationally connected with the inner surface of the box body, the filter element is located in the filter screen, and the discharge pipe is aligned with the filter element; the self-cleaning assembly comprises an outer roller, the annular outer surface of the outer roller is in contact with the annular outer surface of the filter screen, and when the self-cleaning assembly is started, the outer roller rotates to clean the filter screen; the switching assembly comprises a motor, the motor is fixedly connected to the outer surface of the lower end of the box body, the output end of the motor is fixedly connected with the lower end of the filter screen, and the switching assembly is located between the motor and the filter screen and used for switching the working state of the self-cleaning assembly.

Description

Technical Field

[0001] The invention relates to the technical field of purification equipment, in particular to wastewater filtering and purification equipment used in pet food processing. Background Art

[0002] Pet food processing uses a lot of edible fiber, bone mud, vegetables and additives. The wastewater generated during the reproduction process is mainly mixed with the following impurities: the first is floating solid matter, small vegetable leaves and fiber, etc.; the second is suspended matter such as protein, starch and colloids; the third is dissolved acid, alkali, salt and sugar in the water; the fourth is the mud and sand carried by the raw materials;

[0003] Existing filtration devices mostly use multi-stage filtration to preliminarily process the first and second impurities. Although the existing filtration equipment can achieve the self-cleaning function, it can only act on one side of the filter. Due to the flow characteristics of the liquid, some larger impurities may accumulate on the front of the filter, while some smaller impurities or soluble impurities may adhere to the back of the filter as the liquid penetrates. This causes the water flow of the existing filtration equipment to become slower and slower as the use time increases, which is not conducive to rapid filtration.

[0004] To this end, we propose a wastewater filtration and purification equipment for pet food processing. Summary of the invention

[0005] The object of the present invention is to provide a wastewater filtering and purification device for pet food processing to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A wastewater filtration and purification device for pet food processing, comprising a box body, the box body is placed upright, and the upper end of the box body is fixedly connected to an upper cover plate by bolts, an annular outer surface of the box body is fixedly connected to an inlet pipe near the lower end, the upper outer surface of the box body is connected to a discharge pipe, and a filter screen and a filter element for filtering are arranged inside the box body;

[0007] The outer surface of the lower end of the filter screen is rotatably connected to the inner surface of the box body, the filter element is located inside the filter screen, and the discharge pipe is aligned with the filter element;

[0008] A self-cleaning component, the self-cleaning component comprises an outer drum, the annular outer surface of the outer drum contacts the annular outer surface of the filter screen, and when the self-cleaning component is started, the outer drum rotates to clean the filter screen;

[0009] A switching component includes a motor, the motor is fixedly connected to the outer surface of the lower end of the box, the output end of the motor is fixedly connected to the lower end of the filter, and the switching component is located between the motor and the filter, and is used to switch the working state of the self-cleaning component.

[0010] Among them, the self-cleaning component also includes a socket, the lower end of the socket is fixedly connected to the port of the self-cleaning pipe, the inside of the socket is rotatably connected to the outer drum through a bearing, the annular outer surface of the outer drum is made of velvet material, and a flow channel is opened inside, and the outer surface of the flow channel is opened with several groups of through holes for suction.

[0011] A second cavity is provided on the annular inner surface of the socket, and a second gear is rotatably connected inside the second cavity. The second gear is fixedly connected to the outer drum and is connected to the switching assembly.

[0012] Wherein, the switching component includes cavity one, the cavity one opens an interior of the box body near the lower end, the output end of the motor extends to the interior, the annular outer surface of the motor output end is sleeved with gear one, and the gear one is meshed with gear two.

[0013] Among them, the diameter of gear 2 is smaller than the diameter of gear 1, and both gear 1 and gear 2 are helical gears. The lower end of the inner surface of cavity 1 is fixedly connected to an electromagnet, and the corresponding positions of gear 2 and the electromagnet repel each other. The upper end of gear 1 is fixedly connected to spring 1, and the upper end of spring 1 slides with cavity 1. A guide groove is opened at the center position of gear 1, and the annular outer surface of the output end of the motor is fixedly connected to a guide block matching it.

[0014] Among them, the upper end of the filter is provided with an upper connecting plate, and the lower end is provided with a lower connecting plate. The upper end of the upper connecting plate is rotatably connected to the upper cover plate through a bearing. The upper connecting plate is designed as a ring-shaped structure, and a mounting hole is opened on its inner surface of the ring. A connecting rod is fixedly connected to the position aligned with the mounting hole by bolts, and the lower end of the connecting rod is fixedly connected to the lower connecting plate. An external connecting ring is inserted at the lower end of the filter, and a sealed bearing is rotatably connected to the inner side of the external connecting ring. The inner side of the sealed bearing is rotatably connected to a connecting plate, and another group of sealed bearings are rotatably connected to the inner side of the connecting plate. The other group of sealed bearings is rotatably connected to the lower connecting plate.

[0015] Among them, the self-cleaning component also includes an inner drum, which is located between the filter screen and the filter element. The outer surface of the lower end of the inner drum is fixedly connected with a plug rod, and the connecting plate and the plug rod are provided with plug holes at positions corresponding to the plug rod. The plug rod and the plug hole are rotatably connected through a bearing, and the outer surface of the lower end of the plug rod is fixedly connected with a driven wheel, and the annular outer surface of the driven wheel contacts the driving wheel, and the driving wheel is sleeved on the outer surface of the outer drum and fixedly connected thereto.

[0016] Among them, a connecting ring is provided on the outer surface of the upper end of the driving wheel, and the connecting ring consists of a large ring and a small ring. The large ring is rotatably connected to the outer drum through a bearing, and the lower end of the small ring is rotatably connected to the upper end of the driven wheel through a rotating shaft.

[0017] Among them, the annular outer surface of the outer drum is provided with a slide groove 1, and a contraction plate 1 is slidably connected inside the slide groove 1, and a spring 2 is fixedly connected between the contraction plate 1 and the slide groove 1; the annular outer surface of the inner drum is provided with a slide groove 2, and a contraction plate 2 is slidably connected inside the slide groove 2, and a spring 3 is fixedly connected between the contraction plate 2 and the slide groove 2.

[0018] Among them, the lower connecting plate has a "convex" shaped structure design, and the direction of the mounting hole is an inclined structure design.

[0019] The present invention has at least the following beneficial effects:

[0020] By setting a click at the lower end of the filter, the motor directly drives the lower connecting plate and the filter to rotate, and the wastewater enters from the water inlet pipe and is evenly filtered through the filter and the filter element. When the filter needs to be cleaned, the switching component drives gear one and gear two to engage through the electromagnet, thereby driving the outer drum to rotate and rub against the outer surface of the filter. At this time, the drain pipe is in a closed state, and only the self-cleaning pipe and the entry switch are opened. The entry pipe is cleaned to remove liquid to clean the filter. In order to further increase the cleaning of the inner surface of the filter, the rotating outer drum drives the inner drum located inside the filter to rotate through the driving wheel and the driven wheel, thereby cleaning the inner and outer surfaces of the filter at the same time, thereby improving the cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the cutaway structure of the box body of the present invention;

[0023] Figure 3 It is a structural schematic diagram of the self-cleaning component of the present invention;

[0024] Figure 4 For the present invention Figure 3 The enlarged structural diagram at A in the middle;

[0025] Figure 5 It is a structural schematic diagram of the switching component of the present invention;

[0026] Figure 6 It is a schematic diagram of the exploded structure of the switching assembly of the present invention;

[0027] Figure 7 It is a structural schematic diagram of the upper connecting plate and the filter screen of the present invention;

[0028] Figure 8 It is a structural schematic diagram of the connecting ring of the present invention;

[0029] Fig. 9 FIG. 2 is a schematic structural diagram of a second embodiment of the present invention.

[0030] In the figure: 1, box body; 10, discharge pipe; 11, inlet pipe; 12, self-cleaning pipe; 13, motor; 14, upper cover plate; 15, upper connecting plate; 150, mounting hole; 16, filter screen; 17, filter element; 18, lower connecting plate; 19, connecting rod; 2, self-cleaning assembly; 20, outer drum; 201, chute 1; 202, retracting plate; 203, spring 2; 21, through hole; 22, inner drum; 220, chute 2; 221, retracting plate 2; 222. Spring three; 23. Sealed bearing; 24. Connecting plate; 25. External ring; 26. Flow channel; 27. Socket; 3. Switching assembly; 30. Cavity one; 31. Gear one; 32. Electromagnet; 33. Cavity two; 34. Gear two; 35. Driving wheel; 36. Driven wheel; 38. Socket; 39. Rod; 40. Connecting ring; 401. Large ring; 402. Small ring; 41. Spring one; 42. Guide block; 43. Guide groove. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Embodiment 1

[0033] See also Figure 1-9 The present invention provides a technical solution: a wastewater filtration and purification device for pet food processing, comprising a box body 1, the box body 1 is placed upright, and the upper end thereof is fixedly connected to an upper cover plate 14 by bolts, an annular outer surface of the box body 1 is fixedly connected to an inlet pipe 11 near the lower end, an upper outer surface of the box body 1 is connected to a discharge pipe 10, and a filter screen 16 and a filter element 17 for filtering are arranged inside the box body 1;

[0034] The outer surface of the lower end of the filter screen 16 is rotatably connected to the inner surface of the box body 1, and the filter element 17 is located inside the filter screen 16, and the discharge pipe 10 is aligned with the filter element 17. Sewage enters from the water inlet pipe, gradually overflows the filter screen 16 and the filter element 17 and flows out from the discharge pipe 10, and the filter screen 16 blocks larger sludge debris and other residues, and the filter element 17 adsorbs dissolved organic matter to filter the wastewater;

[0035] The self-cleaning component 2 includes an outer drum 20, the annular outer surface of the outer drum 20 contacts the annular outer surface of the filter screen 16. When the self-cleaning component 2 is started, the outer drum 20 rotates to clean the filter screen 16, effectively ensuring that the filter element 17 and the filter screen 16 are in an effective state, so that the practicality of the two is consistent;

[0036] The switching component 3 includes a motor 13, which is fixedly connected to the outer surface of the lower end of the casing 1, and the output end of the motor 13 is fixedly connected to the lower end of the filter 16. The switching component 3 is located between the motor 13 and the filter 16, and is used to switch the working state of the self-cleaning component 2. When the self-cleaning state is not turned on, the motor 13 directly drives the filter 16 to rotate, so that the filter 16 rotates slowly, and the wastewater gradually passes through the rotating filter 16 and the filter element 17, thereby increasing the utilization rate of the filter element 17 and the filter 16.

[0037] The self-cleaning component 2 also includes a socket 27, the lower end of the socket 27 is fixedly connected to the port of the self-cleaning pipe 12, the socket 27 is rotatably connected to the outer drum 20 through a bearing, the annular outer surface of the outer drum 20 is made of velvet material, and a flow channel 26 is provided inside, and the outer surface of the flow channel 26 is provided with a plurality of groups of through holes 21 for suction, and the other end of the self-cleaning pipe 12 is directly connected to the water pump, which is not shown in the prior art in this article. The switching component 3 is switched to the state where the outer drum 20 rotates in pairs, and rotates synchronously with the filter screen 16. Due to the different rotation speeds, the outer surface of the filter screen 16 is cleaned, and the cleaned sewage is discharged through the outer drum 20 and the discharge pipe 10, thereby increasing the cleanliness of the inside of the box body 1. During self-cleaning, the discharge pipe 10 is closed, and clean cleaning liquid flows into the inlet pipe 11. After cleaning, waste water is input from the inlet pipe 11.

[0038] A second cavity 33 is formed on the annular inner surface of the socket 27 , and a second gear 34 is rotatably connected inside the second cavity 33 . The second gear 34 is fixedly connected to the outer drum 20 and is connected to the switching assembly 3 .

[0039] The switching assembly 3 includes a cavity 30, and the cavity 30 opens an interior of the box body 1 near the lower end. The output end of the motor 13 extends to the interior, and the annular outer surface of the output end of the motor 13 is sleeved with a gear 1 31, and the gear 1 31 is engaged with the gear 2 34. The motor 13 drives the output end to rotate, thereby driving the filter 16 to rotate. At the same time, the gear 1 31 and the gear 2 34 are engaged and rotate separately. The gear 1 31 is larger than the gear 2 34, which is conducive to forming a speed difference between the outer drum 20 and the filter 16, thereby improving the self-cleaning effect of the filter 16.

[0040] The diameter of gear 2 34 is smaller than that of gear 1 31, and both gear 1 31 and gear 2 34 are bevel gears. The lower end of the inner surface of cavity 10 is fixedly connected with an electromagnet 32, and the corresponding positions of gear 2 34 and electromagnet 32 ​​repel each other. The upper end of gear 1 31 is fixedly connected with a spring 1 41, and the upper end of spring 1 41 slides with cavity 1 30. A guide groove 43 is opened at the center position of gear 1 31, and a guide block 42 matching with it is fixedly connected to the annular outer surface of the output end of motor 13. Gear 1 31 is made of magnet. When it is necessary to activate the self-cleaning component 2, gear 1 31 is lifted by energizing the electromagnet 32 ​​until the inclined surface of gear 1 31 contacts and meshes with the inclined surface of gear 2 34. Through the mutual cooperation of the above structures, the self-cleaning component 2 can be controlled to be started according to the use requirements to clean the filter 16.

[0041] An upper connecting plate 15 is provided at the upper end of the filter screen 16, and a lower connecting plate 18 is provided at the lower end. The upper end of the upper connecting plate 15 is rotatably connected to the upper cover plate 14 through a bearing. The upper connecting plate 15 is designed as a circular ring structure, and a mounting hole 150 is opened on its annular inner surface. A connecting rod 19 is fixedly connected to the position aligned with the mounting hole 150 by bolts. The lower end of the connecting rod 19 is fixedly connected to the lower connecting plate 18. An external connecting ring 25 is inserted at the lower end of the filter screen 16. A sealed bearing 23 is rotatably connected to the inner side of the external connecting ring 25. A connecting plate 24 is rotatably connected to the inner side of the sealed bearing 23. Another group of sealed bearings 23 are rotatably connected to the inner side of the connecting plate 24. The other group of sealed bearings 23 are rotatably connected to the lower connecting plate 18. The filter screen 16 is fixedly connected to the upper connecting plate 15 and plugged into the lower connecting plate 18 for quick disassembly. At the same time, the lower connecting plate 18 transmits the rotating torque through the connecting rod 19 to increase the stability of the structure.

[0042] The self-cleaning component 2 also includes an inner drum 22, which is located between the filter screen 16 and the filter element 17. The outer surface of the lower end of the inner drum 22 is fixedly connected with a plug rod 39, and the connecting plate 24 is provided with a plug hole 38 at a position corresponding to the plug rod 39. The plug rod 39 is rotatably connected to the plug hole 38 through a bearing, and the outer surface of the lower end of the plug rod 39 is fixedly connected with a driven wheel 36, and the annular outer surface of the driven wheel 36 contacts with a driving wheel 35, and the driving wheel 35 is sleeved on the outer surface of the outer drum 20 and fixedly connected thereto. Due to the flow characteristics of the liquid, fine impurities are easily attached to the outer surface. On the back of the filter 16, the above structure allows the inner drum 22 to rotate synchronously when the outer drum 20 rotates, and the two clean the front and back sides of the filter 16 at the same time. When the outer drum 20 rotates, it drives the driving wheel 35 to rotate, forcing the driven wheel 36 to rotate, and the driven wheel 36 drives the insertion rod 39 and the inner drum 22 to rotate. The driving wheel 35 and the driven wheel 36 are preferably designed with gears to provide the highest friction. While the outer drum 20 and the inner drum 22 rotate, the filter 16 is directly driven by the motor 13 and still rotates, wherein the connecting plate 24 is in a prohibited state, and the two sets of sealed bearings 23 rotate.

[0043] A connecting ring 40 is provided on the outer surface of the upper end of the driving wheel 35. The connecting ring 40 is composed of a large ring 401 and a small ring 402. The large ring 401 is rotatably connected to the outer drum 20 through a bearing, and the lower end of the small ring 402 is rotatably connected to the upper end of the driven wheel 36 through a rotating shaft. The connecting ring 40 limits the positions of the inner drum 22 and the outer drum 20, and limits the inner drum 22 to rotate only at one position. As the filter screen 16 rotates, the inside of the filter screen 16 is cleaned, thereby improving the self-cleaning efficiency of the filter screen 16.

[0044] Embodiment 2

[0045] The annular outer surface of the outer drum 20 is provided with a slide groove 201, a contraction plate 202 is slidably connected inside the slide groove 201, a spring 203 is fixedly connected between the contraction plate 202 and the slide groove 201, and the annular outer surface of the inner drum 22 is provided with a slide groove 220, a contraction plate 202 is slidably connected inside the slide groove 220, and a spring 3 222 is fixedly connected between the contraction plate 202 and the slide groove 220. In this embodiment, the self-cleaning assembly When the self-cleaning component 2 is not started, the inner drum 22 and the outer drum 20 do not contact the filter screen 16. Only after the self-cleaning component 2 is started, with the increase of the rotation speed, under the action of centrifugal force, the contraction plate 2021 and the contraction plate 2022 gradually move away from the slide groove 1 201 and the slide groove 220, and the ends of the contraction plate 2021 and the contraction plate 2022 away from the spring 2 203 and the spring 3 222 are designed with flannel, which directly acts on the outer surface and the inner surface of the filter screen 16, thereby increasing the stability of the structure.

[0046] The "convex"-shaped structural design of the lower connecting plate 18 leaves space for the driving wheel 35 and the driven wheel 36, and the direction of the mounting hole 150 is designed as an inclined structure, which is convenient for disassembly and maintenance.

[0047] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wastewater filtration and purification device for pet food processing, comprising a box (1), wherein the box (1) is placed upright and an upper cover plate (14) is fixedly connected to the upper end thereof by bolts, an inlet pipe (11) is fixedly connected to the annular outer surface of the box (1) near the lower end, an outlet pipe (10) is connected to the upper outer surface of the box (1), a filter screen (16) and a filter element (17) for filtering are arranged inside the box (1), and the characteristics are as follows: The outer surface of the lower end of the filter screen (16) is rotatably connected to the inner surface of the box body (1), the filter element (17) is located inside the filter screen (16), and the discharge pipe (10) is aligned with the filter element (17); A self-cleaning component (2), the self-cleaning component (2) comprising an outer drum (20), the annular outer surface of the outer drum (20) being in contact with the annular outer surface of the filter screen (16), and when the self-cleaning component (2) is started, the outer drum (20) rotates to clean the filter screen (16); A switching component (3), the switching component (3) comprising a motor (13), the motor (13) being fixedly connected to the outer surface of the lower end of the housing (1), the output end of the motor (13) being fixedly connected to the lower end of the filter (16), the switching component (3) being located between the motor (13) and the filter (16), and being used to switch the working state of the self-cleaning component (2).

2. The wastewater filtration and purification equipment for pet food processing according to claim 1, characterized in that: The self-cleaning component (2) further comprises a socket (27), the lower end of which is fixedly connected to the port of the self-cleaning pipe (12), the interior of the socket (27) being rotatably connected to the outer drum (20) via a bearing, the annular outer surface of the outer drum (20) being made of velvet material and having a flow channel (26) therein, the outer surface of the flow channel (26) being provided with a plurality of groups of through holes (21) for suction.

3. The wastewater filtration and purification equipment for pet food processing according to claim 2, characterized in that: The annular inner surface of the socket (27) is provided with a second cavity (33), and a second gear (34) is rotatably connected inside the second cavity (33). The second gear (34) is fixedly connected to the outer drum (20) and is connected to the switching assembly (3).

4. The wastewater filtration and purification equipment for pet food processing according to claim 3, characterized in that: The switching assembly (3) comprises a cavity 1 (30), wherein the cavity 1 (30) is provided with an interior of the housing (1) near the lower end, and the output end of the motor (13) extends into the interior, and a gear 1 (31) is sleeved on the annular outer surface of the output end of the motor (13), and the gear 1 (31) is meshed with a gear 2 (34).

5. The wastewater filtration and purification equipment for pet food processing according to claim 4, characterized in that: The diameter of the gear 2 (34) is smaller than the diameter of the gear 1 (31); the gear 1 (31) and the gear 2 (34) are both helical gears; the lower end of the inner surface of the cavity 1 (30) is fixedly connected with an electromagnet (32); the corresponding positions of the gear 2 (34) and the electromagnet (32) repel each other; the upper end of the gear 1 (31) is fixedly connected with a spring 1 (41); the upper end of the spring 1 (41) slides with the cavity 1 (30); a guide groove (43) is provided at the center of the gear 1 (31); and a guide block (42) matching with the guide block is fixedly connected to the annular outer surface of the output end of the motor (13).

6. The wastewater filtration and purification equipment for pet food processing according to claim 2, characterized in that: The filter screen (16) is provided with an upper connecting plate (15) at the upper end and a lower connecting plate (18) at the lower end. The upper end of the upper connecting plate (15) is rotatably connected to the upper cover plate (14) via a bearing. The upper connecting plate (15) is designed as a ring-shaped structure, and a mounting hole (150) is provided on its inner surface. A connecting rod (19) is fixedly connected to a position aligned with the mounting hole (150) via bolts. The lower end of the connecting rod (19) is fixedly connected to the lower connecting plate (18). An outer connecting ring (25) is inserted at the lower end of the filter screen (16). A sealing bearing (23) is rotatably connected to the inner side of the outer connecting ring (25). A connecting plate (24) is rotatably connected to the inner side of the sealing bearing (23). Another group of sealing bearings (23) is rotatably connected to the lower connecting plate (18).

7. The wastewater filtration and purification equipment for pet food processing according to claim 6, characterized in that: The self-cleaning component (2) further comprises an inner drum (22), wherein the inner drum (22) is located between the filter screen (16) and the filter element (17), a plug rod (39) is fixedly connected to the outer surface of the lower end of the inner drum (22), a plug hole (38) is provided at a position corresponding to the plug rod (39) of the connecting plate (24), the plug rod (39) and the plug hole (38) are rotatably connected via a bearing, a driven wheel (36) is fixedly connected to the outer surface of the lower end of the plug rod (39), the annular outer surface of the driven wheel (36) contacts a driving wheel (35), and the driving wheel (35) is sleeved on the outer surface of the outer drum (20) and is fixedly connected thereto.

8. The wastewater filtration and purification equipment for pet food processing according to claim 7, characterized in that: A connecting ring (40) is provided on the outer surface of the upper end of the driving wheel (35), and the connecting ring (40) is composed of a large ring (401) and a small ring (402). The large ring (401) is rotatably connected to the outer drum (20) via a bearing, and the lower end of the small ring (402) is rotatably connected to the upper end of the driven wheel (36) via a rotating shaft.

9. The wastewater filtration and purification equipment for pet food processing according to claim 8, characterized in that: The outer drum (20) is provided with a slide groove (201) on its annular outer surface, a contraction plate (202) is slidably connected inside the slide groove (201), a spring (203) is fixedly connected between the contraction plate (202) and the slide groove (201), and the inner drum (22) is provided with a slide groove (220) on its annular outer surface, a contraction plate (202) is slidably connected inside the slide groove (220), a spring (222) is fixedly connected between the contraction plate (202) and the slide groove (220).

10. The wastewater filtration and purification equipment for pet food processing according to claim 7, characterized in that: The lower connecting plate (18) has a "convex"-shaped structural design, and the direction of the mounting hole (150) is an inclined structural design.

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