Pig breeding feed stirring device

By designing a pork breeding feed mixing device including mixing barrels, arc plates, square boxes, and twisted dragon shafts, the problem of uneven mixing of Chinese medicine and feed in existing technology and the uniformity of feed nutritional components is realized. Improve the health and production performance of pigs.

CN222401216UActive Publication Date: 2025-01-28GUANGDONG TAISHENG ECOLOGICAL BREEDING CO LTD
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Patent Information

Application Number
CN202420990443.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-09
Publication Date
2025-01-28
Estimated Expiration
2034-05-09

AI Technical Summary

Technical Problem

The existing pig feed agitator cannot effectively mix drugs or trace additives, resulting in unbalanced nutritional components of the feed, affecting the health and production performance of pigs.

Method used

A pork breeding and feed mixing device is designed, including stirring barrels, arc plates, support racks, square boxes, arc -shaped barrels, twisted dragon shafts and twisted dragon leaves. Drugs and feed are mixed and transported to the mixing barrel to achieve evenly.

Benefits of technology

This device can effectively mix drugs and feed, ensure uniform nutrients, and improve pig's health and production performance.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model belongs to the technical field of feed stirring, and particularly relates to a pig breeding feed stirring device which comprises a stirring barrel. A first arc-shaped plate and a second arc-shaped plate are arranged at the bottom end of the stirring barrel; supporting frames are arranged at the bottom ends of the first arc-shaped plate and the second arc-shaped plate; a first feeding hole is formed in the top end of the stirring barrel; the top end of the stirring barrel is fixedly connected with a square box; the top end of the square box is fixedly connected with a concentric-square-shaped plate; a second feeding hole is formed in the concentric-square-shaped plate; an arc-shaped barrel is fixedly connected into the square box; in order to overcome the defects in the prior art, the pig feed stirring device solves the problems that due to the fact that an existing pig feed stirring device is not provided with a device capable of mixing medicine or trace additives in advance, even stirring is difficult to achieve when the medicine or the trace additives are added into the stirring device, and the stirring effect is poor. Therefore, the problem that the health and the production performance of the pigs are affected due to unbalanced nutritional ingredients of the feed ingested by the pigs can be solved.
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Description

Technical Field

[0001] The utility model belongs to the technical field of feed mixing, in particular to a feed mixing device for pig breeding. Background Art

[0002] Pig feed is a mixture designed to meet the nutritional needs of pigs for growth, development and production. This feed usually consists of a variety of raw materials, such as protein feed, energy feed, roughage, mineral feed, and feed additives to ensure that pigs get comprehensive and balanced nutrition.

[0003] In the prior art, the existing pig feed is simply stirred by the stirring device when stirring the feed. Because the device itself does not have a device that can mix the medicine or trace additives in advance, it is difficult to stir the medicine or trace additives evenly when adding them into the stirring device, which may cause the nutritional components of the feed ingested by the pig to be unbalanced, affecting its health and production performance.

[0004] To this end, the utility model provides a pig breeding feed stirring device. Utility Model Content

[0005] In order to make up for the shortcomings of the existing technology and solve the problem that the existing pig feed is simply stirred by the stirring device when stirring the feed, because the device itself does not have a device that can mix the medicine or trace additives in advance, it will be difficult to stir evenly when adding medicines or trace additives into the stirring device, which may lead to unbalanced nutritional components of the feed ingested by the pigs, affecting their health and production performance.

[0006] The technical solution adopted by the utility model to solve its technical problems is: the utility model describes a pig breeding feed stirring device, comprising a stirring barrel; a first arc plate and a second arc plate are provided at the bottom end of the stirring barrel; a support frame is provided at the bottom ends of the first arc plate and the second arc plate; a first feed inlet is provided at the top end of the stirring barrel; a square box is fixedly connected to the top end of the stirring barrel; a circular plate is fixedly connected to the top end of the square box; a second feed inlet is provided on the circular plate; an arc barrel is fixedly connected inside the square box; an auger shaft is provided inside the arc barrel; an auger blade is fixedly connected to the auger shaft; one end of the auger shaft passes through the arc barrel; a through groove is provided at the bottom end of the arc barrel; the through groove passes through the square box and the stirring barrel; a power piece is provided on one side of the stirring barrel; the power piece is used to drive the auger shaft to rotate.

[0007] Preferably, the power component includes a motor; the motor is fixedly connected to one side of the square box through an L-shaped rod; a first rotating shaft is provided at the output end of the motor; one end of the first rotating shaft is rotatably connected to one side of the square box, and one end of the first rotating shaft passes through the interior of the square box and is fixedly connected to one end of the auger shaft.

[0008] Preferably, a stirring rod is rotatably connected to one side of the mixing barrel; and one end of the stirring rod passes through the mixing barrel; a group of rings is transversely slidably connected to the stirring rod; a group of stirring columns are respectively fixedly connected to a group of the rings; a group of elastic telescopic rods are respectively fixedly connected between a group of the stirring rods; arc-shaped protrusions are fixedly connected on both sides of the mixing barrel; a pair of slide grooves are provided inside the mixing barrel; a pair of sliders are respectively slidably connected in the pair of slide grooves; a scraper is fixedly connected between the pair of sliders relative to each other; the scraper is rotatably connected to the inner wall of the mixing barrel; a transmission member is provided on one side of the mixing barrel; the transmission member is used to drive the stirring rod.

[0009] Preferably, the transmission member comprises a first sprocket; the first sprocket is fixedly connected to the first rotating shaft; one end of the stirring rod passing through the stirring barrel is fixedly connected to the second sprocket; the first sprocket and the second sprocket are driven by a chain.

[0010] Preferably, the first arc plate is fixedly connected to the top of the support frame; the second arc plate is rotatably connected to the top of the support frame; the second arc plate is fixedly connected to the mixing barrel; a cross plate is fixedly connected between the relative inner walls of the support frame; a cylinder telescopic rod is fixedly connected to the cross plate; a connecting block is hinged at the telescopic end of the cylinder telescopic rod; and the connecting block is slidably connected to the mixing barrel.

[0011] Preferably, one end of the mixing barrel is fixedly connected to a discharge pipe; and one end of the discharge pipe is slidably connected to a piston.

[0012] The beneficial effects of the utility model are as follows:

[0013] 1. The utility model discloses a pig breeding feed stirring device, by arranging a stirring barrel, arranging a first curved plate and a second curved plate at the bottom of the stirring barrel, arranging a support frame at the bottom ends of the first curved plate and the second curved plate, so as to support the stirring barrel, and opening a first feeding port at the top end of the stirring barrel, so as to facilitate the staff to put the feed into the stirring barrel and then stir it by adding water, and by arranging a square box at the top end of the stirring barrel, an arc-shaped barrel is arranged in the square box, and an auger shaft and auger blades are arranged in the arc-shaped barrel, when the staff needs to mix medicine and additives with the feed, the medicine and the feed can be put in together through the second feeding port first, and the power part drives the auger shaft to rotate, so that the auger blade transports the mixed feed and medicine forward while completing the first mixing with the feed, and after moving to the through groove, it will fall into the stirring barrel by itself and mix with a large amount of feed, so that the medicine effect is evenly mixed with the feed.

[0014] 2. The pig breeding feed stirring device described in the utility model is characterized in that a stirring rod is arranged inside a stirring barrel, and a group of stirring columns are fixedly connected to the stirring rod through a sleeve ring, and the feed is stirred by a transmission member to mix the feed with water, and a pair of elastic telescopic rods are arranged between a group of stirring columns, and a pair of arc-shaped protrusions are arranged on the inner wall of the stirring barrel, when the stirring column rotates to the position of the arc-shaped protrusion, the edges of the two sides of the stirring column and the arc-shaped protrusion are squeezed against each other, and then the elastic telescopic rod retracts because the distance between the two ends is short, so the second one will be squeezed immediately, and when the stirring column at the edge leaves the arc-shaped protrusion, the elastic telescopic rod rebounds to make the stirring column vibrate, and the feed attached to the stirring column is shaken off, and a pair of chute is opened on the inner wall of the stirring barrel, and sliders are arranged in the pair of chute, and when the transmission member drives the stirring column to rotate, the slider is squeezed and pushed, and then the scraper is driven, and the feed attached to the inner wall of the stirring barrel can be scraped off, and stirring can continue. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model will be further described below in conjunction with the accompanying drawings.

[0016] Figure 1 It is a three-dimensional diagram of the utility model;

[0017] Figure 2 It is the front view of the utility model;

[0018] Figure 3 It is a partial structural diagram of the utility model;

[0019] Figure 4 It is a partial structural schematic diagram of the utility model;

[0020] Figure 5 It is a partial diagram of the utility model;

[0021] In the figure: 1, mixing barrel; 2, first arc plate; 3, second arc plate; 4, support frame; 5, first feed port; 6, square box; 7, circular plate; 8, second feed port; 9, arc barrel; 10, auger shaft; 11, auger blade; 12, through groove; 13, motor; 14, L-shaped rod; 15, first rotating shaft; 16, stirring rod; 17, collar; 18, stirring column; 20, slide groove; 21, slider; 22, scraper; 23, first sprocket; 24, second sprocket; 25, cross plate; 26, cylinder telescopic rod; 27, connecting block; 28, discharge pipe; 29, piston; 30, chain; 31, elastic telescopic rod; 32, arc-shaped protrusion. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0023] like Figures 1 to 5 As shown, a pig breeding feed stirring device described in an embodiment of the utility model comprises a stirring barrel 1; a first curved plate 2 and a second curved plate 3 are provided at the bottom end of the stirring barrel 1; a supporting frame 4 is provided at the bottom ends of the first curved plate 2 and the second curved plate 3; a first feeding port 5 is provided at the top of the stirring barrel 1; a square box 6 is fixedly connected to the top of the stirring barrel 1; a circular plate 7 is fixedly connected to the top of the square box 6; a second feeding port 8 is provided on the circular plate 7; an arc barrel 9 is fixedly connected inside the square box 6; an auger shaft 10 is provided inside the arc barrel 9; an auger blade 11 is fixedly connected to the auger shaft 10; one end of the auger shaft 10 passes through the arc barrel 9; a through groove 12 is provided at the bottom end of the arc barrel 9; the through groove 12 passes through the square box 6 and the stirring barrel 1; a power piece is provided on one side of the stirring barrel 1; the power piece is used to drive the auger shaft 10 to rotate, and when working, by setting the stirring barrel 1. A first curved plate 2 and a second curved plate 3 are arranged at the bottom of the mixing barrel 1. A support frame 4 is arranged at the bottom ends of the first curved plate 2 and the second curved plate 3 to support the mixing barrel 1. A first feeding port 5 is opened at the top of the mixing barrel 1 to facilitate the staff to put the feed into the mixing barrel 1 and then add water for stirring. A square box 6 is arranged at the top of the mixing barrel 1, and a curved barrel 9 is arranged in the square box 6. An auger shaft 10 and an auger blade 11 are arranged in the curved barrel 9. When the staff needs to mix the medicine and additives with the feed, the medicine and the feed can be put in together through the second feeding port 8 first. The power part drives the auger shaft 10 to rotate, so that the auger blade 11 transports the mixed feed and medicine forward while completing the first mixing with the feed. After moving to the through groove 12, it will fall into the mixing barrel 1 by itself and mix with a large amount of feed, so that the medicine effect is evenly mixed with the feed.

[0024] The power part includes a motor 13; the motor 13 is fixedly connected to one side of the square box 6 through an L-shaped rod 14; a first rotating shaft 15 is provided at the output end of the motor 13; one end of the first rotating shaft 15 is rotatably connected to one side of the square box 6, and one end of the first rotating shaft 15 passes through the inside of the square box 6 and is fixedly connected to one end of the auger shaft 10. When working, the motor 13 is fixedly connected to one side of the square box 6 with the L-shaped rod 14 to prevent the motor 13 from rotating itself. The first rotating shaft 15 is provided at the output end of the motor 13. When the first rotating shaft 15 rotates, it drives the auger shaft 10 to rotate to complete the mixing and transportation of medicine and feed.

[0025] A stirring rod 16 is rotatably connected to one side of the mixing barrel 1; and one end of the stirring rod 16 passes through the mixing barrel 1; a group of collars 17 are slidably connected to the stirring rod 16; a group of stirring columns 18 are respectively fixedly connected to a group of the collars 17; a group of elastic telescopic rods 31 are respectively fixedly connected between a group of the stirring rods 16; arc-shaped protrusions 32 are fixedly connected to both sides of the mixing barrel 1; a pair of slide grooves 20 are provided inside the mixing barrel 1; a pair of sliders 21 are respectively slidably connected in a pair of the slide grooves 20; a pair of the sliders 21 are fixedly connected relative to each other with a scraper 22; the scraper 22 is rotatably connected to the inner wall of the mixing barrel 1; a transmission member is provided on one side of the mixing barrel 1; the transmission member is used to drive the stirring rod 16. When working, the stirring rod 16 is arranged inside the mixing barrel 1, and a group of stirring columns 18 are fixedly connected to the stirring rod 16 through the collar 17, and the feed is driven by the transmission member. The stirring is performed to mix the feed with water. A pair of elastic telescopic rods 31 are arranged between a group of stirring columns 18, and a pair of arc-shaped protrusions 32 are arranged on the inner wall of the stirring barrel 1. When the stirring column 18 is rotated to the position of the arc-shaped protrusion 32, the edges of the stirring column 18 on both sides are squeezed against the arc-shaped protrusion 32, and then the elastic telescopic rod 31 retracts. Because the distance between the stirring columns 18 and the arc-shaped protrusion 32 is short, the second one will be squeezed immediately. When the stirring column 18 at the edge leaves the arc-shaped protrusion 32, the elastic telescopic rod 31 rebounds to make the stirring column 18 vibrate, and the feed attached to the stirring column 18 is shaken off. A pair of chutes 20 are provided on the inner wall of the stirring barrel 1, and sliders 21 are arranged in the pair of chutes 20. When the transmission member drives the stirring column 18 to rotate, the slider 21 is squeezed and pushed, and then the scraper 22 is driven, so that the feed attached to the inner wall of the stirring barrel 1 can be scraped off, and the stirring can continue.

[0026] The transmission member includes a first sprocket 23; the first sprocket 23 is fixedly connected to the first rotating shaft 15; the stirring rod 16 passes through the stirring barrel 1 and is fixedly connected to the second sprocket 24 at one end; the first sprocket 23 and the second sprocket 24 are driven by the chain 30. When working, by fixing the first sprocket 23 on the first rotating shaft 15, and fixing the second sprocket 24 on the stirring rod 16, when the chain 30 is driven, the first rotating shaft 15 drives the auger shaft 10 to mix the medicine and the feed, and the stirring rod 16 mixes the feed and the water. After the auger shaft 10 mixes the medicine and the feed and transports them to fall into the stirring barrel 1, the mixing and stirring are continued to be carried out to perfectly mix the medicine or additive with the feed.

[0027] The first curved plate 2 is fixedly connected to the top of the support frame 4; the second curved plate 3 is rotatably connected to the top of the support frame 4; the second curved plate 3 is fixedly connected to the mixing barrel 1; a transverse plate 25 is fixedly connected between the opposite inner walls of the support frame 4; a cylinder telescopic rod 26 is fixedly connected to the transverse plate 25; the telescopic end of the cylinder telescopic rod 26 is hinged with a connecting block 27; the connecting block 27 slides on the mixing barrel 1. During operation, the mixing barrel 1 can be supported by fixing the first curved plate 2 to the top of the support frame 4, and the second curved plate 3 is rotatably set at the top of the support frame 4. After the feed is mixed, the front section of the mixing barrel 1 can be lifted up by the cylinder telescopic rod 26 set on the transverse plate 25 between the support frames 4 to tilt the mixing barrel 1, so that the staff can easily take out the mixed feed from the mixing barrel 1.

[0028] One end of the mixing barrel 1 is fixedly connected to a discharge pipe 28; one end of the discharge pipe 28 is slidably connected to a piston 29. During operation, the discharge pipe 28 is arranged on one side of the mixing barrel, and a piston 29 is arranged on one side of the discharge pipe 28. When the cylinder telescopic rod 26 lifts the mixing barrel 1, the staff can take out the piston 29, and the feed will flow out of the mixing barrel 1 very quickly due to the tilt. The staff prepares a loading truck in advance to receive the mixed feed to complete the feeding of the pigs.

[0029] Working principle: by setting a mixing barrel 1, setting a first curved plate 2 and a second curved plate 3 at the bottom of the mixing barrel 1, and setting a support frame 4 at the bottom of the first curved plate 2 and the second curved plate 3, the mixing barrel 1 can be supported, and a first feed port 5 is opened at the top of the mixing barrel 1, which can facilitate the staff to put the feed into the mixing barrel 1 and then add water for mixing, and by setting a square box 6 at the top of the mixing barrel 1, a curved barrel 9 is set in the square box 6, and an auger shaft 10 and an auger blade 11 are set in the curved barrel 9. When the staff needs to mix the medicine and additives with the feed, the medicine and the feed can be put in through the second feed port 8 first, and the power part drives the auger shaft 10 to rotate, so that the auger blade 11 can transport the mixed feed and medicine forward while completing the mixing with the feed After the first mixing, it will move to the through groove 12 and then fall into the mixing barrel 1 by itself to mix with a large amount of feed, so that the drug effect is evenly mixed with the feed. By fixing the motor 13 to one side of the square box 6 with an L-shaped rod 14, the motor 13 can be prevented from rotating by itself. A first rotating shaft 15 is set at the output end of the motor 13. When the first rotating shaft 15 rotates, it drives the auger shaft 10 to rotate to complete the mixing and transportation of the drug and the feed. A stirring rod 16 is set inside the mixing barrel 1, and a group of stirring columns 18 are fixed to the stirring rod 16 through a collar 17. The feed is stirred by a transmission member to mix the feed with water. A pair of elastic telescopic rods 31 are set between a group of stirring columns 18, and a pair of arc-shaped The protrusion 32 can be used when the stirring column 18 rotates to the position of the arc-shaped protrusion 32, and the edges of the stirring column 18 on both sides are squeezed against the arc-shaped protrusion 32, and then the elastic telescopic rod 31 retracts. Because the distance between the two ends is short, it will immediately squeeze the second one. After the stirring column 18 at the edge leaves the arc-shaped protrusion 32, the elastic telescopic rod 31 rebounds to make the stirring column 18 vibrate, and the feed attached to the stirring column 18 is shaken off. By opening a pair of chutes 20 on the inner wall of the mixing barrel 1, and arranging sliders 21 in the pair of chutes 20, when the transmission member drives the stirring column 18 to rotate, the sliders 21 are squeezed and pushed, and then the scraper 22 is driven to scrape off the feed attached to the inner wall of the mixing barrel 1, and the stirring is continued. The first sprocket 23 is fixed to the rotating shaft 15, and the second sprocket 24 is fixed to the stirring rod 16. When the chain 30 is driven, the first rotating shaft 15 drives the auger shaft 10 to mix the medicine and the feed, and the stirring rod 16 mixes the feed and the water. After the auger shaft 10 mixes the medicine and the feed and transports them to the mixing barrel 1, the mixing continues to be stirred and mixed, and the medicine or additive is perfectly mixed with the feed. The mixing barrel 1 can be supported by fixing the first curved plate 2 to the top of the support frame 4, and the second curved plate 3 is rotatably set on the top of the support frame 4. After the feed is mixed, the front section of the mixing barrel 1 can be lifted up by the cylinder telescopic rod 26 set on the horizontal plate 25 between the support frames 4 to tilt the mixing barrel 1.The staff can conveniently take out the mixed feed from the mixing barrel 1 by setting a discharge pipe 28 on one side of the mixing barrel and setting a piston 29 on one side of the discharge pipe 28. When the cylinder telescopic rod 26 lifts the mixing barrel 1, the staff can take out the piston 29, and the feed will flow out of the mixing barrel 1 very quickly due to the tilt. The staff prepares a loading vehicle in advance to receive the mixed feed to feed the pigs.

[0030] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. Figure 1 As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0032] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A pig breeding feed stirring device, characterized in that: The invention comprises a mixing barrel (1); a first curved plate (2) and a second curved plate (3) are provided at the bottom end of the mixing barrel (1); a support frame (4) is provided at the bottom ends of the first curved plate (2) and the second curved plate (3); a first feed port (5) is provided at the top end of the mixing barrel (1); a square box (6) is fixedly connected to the top end of the mixing barrel (1); a round plate (7) is fixedly connected to the top end of the square box (6); a second feed port (8) is provided on the round plate (7); an arc barrel (9) is fixedly connected inside the square box (6); an auger shaft (10) is provided inside the arc barrel (9); an auger blade (11) is fixedly connected to the auger shaft (10); one end of the auger shaft (10) passes through the arc barrel (9); a through groove (12) is provided at the bottom end of the arc barrel (9); the through groove (12) passes through the square box (6) and the mixing barrel (1); a power member is provided on one side of the mixing barrel (1); the power member is used to drive the auger shaft (10) to rotate.

2. A pig breeding feed stirring device according to claim 1, characterized in that: The power member comprises a motor (13); the motor (13) is fixedly connected to one side of the square box (6) via an L-shaped rod (14); a first rotating shaft (15) is provided at the output end of the motor (13); one end of the first rotating shaft (15) is rotatably connected to one side of the square box (6), and one end of the first rotating shaft (15) passes through the interior of the square box (6) and is fixedly connected to one end of the auger shaft (10).

3. A pig breeding feed stirring device according to claim 2, characterized in that: A stirring rod (16) is rotatably connected to one side of the stirring barrel (1); and one end of the stirring rod (16) passes through the stirring barrel (1); a group of collars (17) are slidably connected to the stirring rod (16); a group of stirring columns (18) are respectively fixedly connected to a group of collars (17); a group of elastic telescopic rods (31) are respectively fixedly connected between the stirring rods (16); arc-shaped protrusions (32) are fixedly connected to both sides of the stirring barrel (1); a pair of slide grooves (20) are provided inside the stirring barrel (1); a pair of sliders (21) are slidably connected to the pair of slide grooves (20); a scraper (22) is fixedly connected between the pair of sliders (21); the scraper (22) is rotatably connected to the inner wall of the stirring barrel (1); a transmission member is provided on one side of the stirring barrel (1); the transmission member is used to drive the stirring rod (16).

4. A pig breeding feed stirring device according to claim 3, characterized in that: The transmission member comprises a first sprocket (23); the first sprocket (23) is fixedly connected to the first rotating shaft (15); one end of the stirring rod (16) passing through the stirring barrel (1) is fixedly connected to a second sprocket (24); the first sprocket (23) and the second sprocket (24) are driven by a chain (30).

5. A pig breeding feed stirring device according to claim 4, characterized in that: The first arc-shaped plate (2) is fixedly connected to the top of the support frame (4); the second arc-shaped plate (3) is rotatably connected to the top of the support frame (4); the second arc-shaped plate (3) is fixedly connected to the mixing barrel (1); a transverse plate (25) is fixedly connected between the opposite inner walls of the support frame (4); a cylinder telescopic rod (26) is fixedly connected to the transverse plate (25); a connecting block (27) is hinged at the telescopic end of the cylinder telescopic rod (26); and the connecting block (27) is slidably connected to the mixing barrel (1).

6. A pig breeding feed stirring device according to claim 5, characterized in that: One end of the mixing barrel (1) is fixedly connected to a discharge pipe (28); one end of the discharge pipe (28) is slidably connected to a piston (29).