Bulking machine for producing pig feed

Abstract

The utility model relates to a bulking machine for producing pig feed, which comprises a casing, a feed pipe and a driving shaft are arranged on the casing, a first helical blade, a second helical blade, a third helical blade and a fourth helical blade are arranged on the driving shaft, a fixing ring is arranged on the outer side of the casing and positioned between the second helical blade and the third helical blade, and the feed pipe is connected with the feed pipe. The fixing ring and the machine shell are provided with shear pins, the end, away from the feeding pipe, of the machine shell is provided with a die head installation plate, the die head installation plate is movably connected with the driving shaft, the die head installation plate on the outer side of the driving shaft is provided with a plurality of die heads, and the die heads are evenly distributed on the outer side of the driving shaft in a star shape. Each die head is provided with a through hole, and the diameter of an inner cavity of each through hole is gradually increased along with the fact that the through hole gradually gets away from the fourth spiral blade. And the probability that the shearing pin is damaged due to the stress transmitted by the extruded material is reduced. The utility model has the advantages of convenient use and wide market prospect.

Description

Technical Field

[0001] The utility model relates to the field of feed processing equipment, in particular to an expander for producing pig feed. Background Art

[0002] The expansion technology is more and more widely used in the feed industry, and the development speed is getting faster and faster. It has advantages that other processing methods cannot match in processing special animal feed, aquatic feed, early weaned pig feed and feed resource development. The extruder is composed of four parts: frequency conversion feeding mechanism, extrusion part, steam regulation mechanism and electric control cabinet. The extrusion part of the extruder is composed of an extrusion barrel and an extrusion auger. The extrusion barrel is generally composed of three sections of extrusion barrels with the same inner diameter. The extrusion auger is installed in the extrusion barrel. When the long auger rotates at a certain speed, the material entering the extrusion barrel is pushed forward. The extrusion part composed of the extrusion barrel and the extrusion auger can be divided into four parts according to its function: feeding section, compression section, tempering section and discharging section. The feeding section adopts equidistant spiral, and its main function is to quickly feed the material. The compression section adopts variable pitch spiral, specifically, each group of compression sections includes two spiral blades with different pitches, and a shear pin is installed between the two spiral blades to shear and stir the compacted material. The conditioning section includes an equidistant screw and a steam impregnation device, which conveys the material through the equidistant screw and injects steam into the material through the steam impregnation device, and adjusts the temperature and humidity of the material by adjusting the amount of steam input, so that the protein in the material can be deformed into a better gel material. The discharging section includes a porous template or a conical mold sleeve, so that the heat and pressure of the material itself are released through the porous template or the conical mold sleeve, thereby achieving material expansion.

[0003] From the design perspective of the extruder, a simple structure and easy replacement of wearing parts, which is convenient for maintenance, has always been one of the design ideas of the extruder. Among them, the shear pin installed on the compression section is one of the wearing parts because it needs to shear and stir the compacted material, and it also needs to be replaced to achieve maintenance. In the process of shearing and stirring the material, the shear pin body is not only worn by the stress generated by the direct action of the material, but also the body on which the shear pin is installed will be subjected to stress. In the long run, the part of the body where the shear pin is installed will be damaged by stress. Although maintenance can be achieved through welding and other methods, the structural strength is not as good as before, which shortens the normal use cycle and greatly increases the maintenance frequency. In this regard, there is room for improvement in the extruder, so as to reduce the damage to the body caused by the shear pin stress, thereby maintaining the previous normal use cycle and reducing the maintenance frequency. Summary of the invention

[0004] In view of the deficiencies in the prior art, the utility model provides an extruder for producing pig feed, which reduces the probability of damage to the shear pin due to the stress transmitted by the compacted material, and is used to overcome the defects in the prior art.

[0005] The technical scheme adopted by the utility model is as follows: an extruder for producing pig feed, comprising a casing, a feed pipe and a drive shaft are arranged on the casing, a first spiral blade, a second spiral blade, a third spiral blade and a fourth spiral blade are arranged in sequence along the direction from close to the feed pipe to far away from the feed pipe on the drive shaft, the pitch of the third spiral blade is not greater than the pitch of the second spiral blade, a fixing ring is arranged on the outer side of the casing, the fixing ring is located between the second spiral blade and the third spiral blade, a shear pin is arranged on the fixing ring and the casing, a die head mounting plate is arranged on one end of the casing away from the feed pipe, the die head mounting plate is movably connected to the drive shaft, a die head is arranged on the die head mounting plate on the outer side of the drive shaft, a plurality of die heads are adopted, and the plurality of die heads are evenly distributed on the outer side of the drive shaft in a star shape, a through hole is opened on each die head, and the diameter of the inner cavity of each through hole gradually increases as the through hole gradually moves away from the fourth spiral blade.

[0006] Preferably, the die head has a stepped shape, the large end of the die head is located on the side close to the fourth spiral blade, and the die head mounting plate is provided with a pressure plate on the side away from the fourth spiral blade. The pressure plate adopts an annular plate structure, and fixing bolts are provided on the pressure plate and the casing. The number of the fixing bolts is several, and the several fixing bolts are evenly distributed in a star shape on the outside of the central axis of the drive shaft.

[0007] Preferably, a watering device and a humidity sensor are alternately arranged on the outer side of the fourth spiral blade along the direction from close to the die mounting plate to away from the die mounting plate, and the watering device includes a pressure equalizing ring, a steam delivery pipe and a drain pipe arranged on the pressure equalizing ring, and a nozzle arranged on the pressure equalizing ring and the casing.

[0008] Preferably, the watering device further comprises regulating valves respectively arranged on the steam delivery pipe and the drain pipe, the number of nozzles in each of the watering devices is several, the several nozzles in each of the watering devices are evenly distributed in a star shape on the outside of the central axis of the driving shaft, and the drain pipe in each of the watering devices is located at the bottom end of the corresponding pressure equalizing ring.

[0009] Preferably, a fifth spiral blade is arranged on the driving shaft between the fourth spiral blade and the die mounting plate, and the inner cavity diameter of the casing outside the fifth spiral blade gradually decreases as it approaches the die mounting plate.

[0010] Preferably, a temperature sensor is provided on the casing outside the fourth spiral blade.

[0011] Preferably, a first pulley is arranged on the driving shaft outside the housing, a second pulley is arranged below the first pulley, a transmission belt is arranged on the second pulley and the first pulley, and a driving motor is arranged on the second pulley.

[0012] The beneficial effects of the utility model are as follows: firstly, the utility model installs a fixing ring on the outer side of the casing, and the shear pins are installed on the fixing ring and the casing, thereby increasing the structural strength of the casing itself, thereby reducing the damage to the casing itself caused by the stress transmitted by the compacted material to the shear pins.

[0013] Secondly, the utility model is provided with fixing bolts on the pressing plate and the casing, and the number of the fixing bolts is several, and the several fixing bolts are evenly distributed in a star shape on the outside of the central axis of the driving shaft; thereby facilitating the installation and disassembly of the die head mounting plate.

[0014] The utility model has the advantages of simple structure, convenient operation, ingenious design, greatly improved working efficiency, good social and economic benefits, and is a product that is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Figure 2 for Figure 1 A partial enlarged schematic diagram of detail A.

[0017] Figure 3 It is a structural schematic diagram of the components of the utility model.

[0018] Figure 4 It is a structural schematic diagram of the die head mounting plate of the utility model. DETAILED DESCRIPTION

[0019] like Figures 1 to 4As shown, an extruder for producing pig feed includes a casing 1, a feed pipe 2 and a drive shaft 3 are arranged on the casing 1, and a first spiral blade 4, a second spiral blade 5, a third spiral blade 6 and a fourth spiral blade 7 are arranged in sequence along the direction from close to the feed pipe 2 to far away from the feed pipe 2. The pitch of the third spiral blade 6 is not greater than the pitch of the second spiral blade 5. The casing 1 between the second spiral blade 5 and the third spiral blade 6 and the casing 1 of the fourth spiral blade 7 are respectively provided with a fixing ring 8, and each fixing ring 8 and the casing 1 are respectively provided with a plurality of shear pins 9, a die mounting plate 10 is provided on the end of the casing 1 away from the feed pipe 2, the die mounting plate 10 and the drive shaft 3 are movably connected, a die 11 is provided on the die mounting plate 10 outside the drive shaft 3, and the number of die heads 11 is several, and the plurality of die heads 11 are evenly distributed in a star shape on the outside of the drive shaft 3, each die head 11 is provided with a through hole 12, and the diameter of the inner cavity of each through hole 12 gradually increases as the through hole 12 gradually moves away from the fourth spiral blade 7.

[0020] The die head 11 has a stepped shape, and the large end of the die head 11 is located on the side close to the fourth spiral blade 7, so that the die head 11 can remain stable on the die head mounting plate 10 after being subjected to the stress brought by the material; the die head mounting plate 10 is provided with a pressure plate 13 on the side away from the fourth spiral blade 7, and the pressure plate 13 adopts an annular plate structure, and the inner cavity of the end of the pressure plate 13 close to the die head mounting plate 10 is matched with the shape of the die head mounting plate 10; fixing bolts 14 are provided on the pressure plate 13 and the casing 1, and the number of the fixing bolts 14 is several, and the several fixing bolts 14 are evenly distributed in a star shape on the outside of the central axis of the drive shaft 3.

[0021] On the outer side of the fourth spiral blade 7, the casing 1 is provided with water devices and humidity sensors 15 alternately arranged in sequence along the direction from close to the die mounting plate 10 to far away from the die mounting plate 10. The water devices include a pressure equalizing ring 16, a steam delivery pipe 17 and a drainage pipe 18 arranged on the pressure equalizing ring 16, and a nozzle 19 arranged on the pressure equalizing ring 16 and the casing 1. The number of the water devices corresponds to the number of humidity sensors 15, and the conveyed material is watered and temperature-controlled by a plurality of the water devices in sequence, so that the material is tempered. Furthermore, a temperature sensor 22 is arranged on the outer side of the fourth spiral blade 7. The temperature sensor 22 is located between the die mounting plate 10 and the adjacent humidity sensor 15, so that the material temperature control parameters can be judged by the parameters fed back by the temperature sensor 22.

[0022] Since the material is below 150°C in the casing 1, when the ambient temperature is low in winter, the regulated saturated steam transported from the upstream will exchange heat with the environment and become partially liquefied. If the partially liquefied steam is directly transported to the material, it will cause the local moisture content of the material to be too high, thereby affecting the puffing effect. Therefore, the watering device described in this product also includes regulating valves 20 respectively arranged on the steam delivery pipe 17 and the drain pipe 18. The number of nozzles 19 in each of the watering devices is several, and the several nozzles 19 in each of the watering devices are evenly distributed in a star shape on the outside of the central axis of the drive shaft 3. The drain pipe 18 in each of the watering devices is located at the bottom end of the corresponding pressure equalizing ring 16. A large amount of liquefied saturated steam reaches the bottom of the pressure equalizing ring 16 and can be discharged outward through the drain pipe 18 at the bottom end of the pressure equalizing ring 16. At the same time, although part of the liquefied saturated steam is temporarily stored at the bottom of the pressure equalizing ring 16, the pressure of the saturated steam entering the pressure equalizing ring 16 can still be balanced through the inner cavity of the pressure equalizing ring 16, so that the steam pressure obtained by the several nozzles 19 installed on the pressure equalizing ring 16 tends to be consistent, which is convenient for the passing materials to be evenly irrigated and temperature-controlled.

[0023] A fifth spiral blade 21 is provided on the driving shaft 3 between the fourth spiral blade 7 and the die mounting plate 10. The inner cavity diameter of the casing 1 outside the fifth spiral blade 21 gradually decreases as it approaches the die mounting plate 10. Preferably, the inner cavity of the casing 1 outside the fifth spiral blade 21 is in a truncated cone shape; thereby, the pressure and temperature of the material can be further increased by utilizing the combined effect of the truncated cone-shaped inner cavity and the fifth spiral blade 21, thereby improving the puffing effect.

[0024] A first pulley 23 is arranged on the driving shaft 3 outside the casing 1, a second pulley 24 is arranged below the first pulley 23, a transmission belt 25 is arranged on the second pulley 24 and the first pulley 23, and a driving motor 26 is arranged on the second pulley 24.

[0025] The usage of this product is as follows: Figures 1 to 4 As shown, the following steps are included:

[0026] The driving motor 26 is turned on, and the material to be expanded is continuously conveyed to the feed pipe 2 and then driven by the first spiral blade 4 to move toward the direction of the second spiral blade 5, and then compressed step by step by the second spiral blade 5 and the third spiral blade 6 to form a compacted material. During this period, the compacted material is sheared and stirred by the shear pin 9 between the second spiral blade 5 and the third spiral blade 6, and then conveyed to the fourth spiral blade 7 to keep moving forward at a constant speed. In the process of the fourth spiral blade 7 conveying the material, the material is gradually watered and temperature-controlled by several watering devices in turn, and the moisture parameters of the material are fed back by several humidity sensors 15 in turn. After the temperature of the material after watering and temperature adjustment is fed back by the temperature sensor 22, it is further driven by the fifth spiral blade 21, and the material is further compressed in combination with the shape of the inner cavity of the casing 1 outside the fifth spiral blade 21, so that the temperature of the material is further increased, thereby reaching the specified degree of maturation. Finally, the material is transported to the through hole 12 of the die head 11, where it is squeezed and slowly expands, releasing some energy. After being squeezed out of the through hole 12, the instantaneous flash evaporation of water in the material is weakened, so that the material can still lock some water, thereby increasing the bulk density of the expanded material.

[0027] Through this embodiment, a fixing ring 8 is installed on the outside of the casing 1, and the shear pin 9 is installed on the fixing ring 8 and the casing 1. Since the structural strength of the casing 1 itself is increased, the shear pin 9 is reduced from being damaged by the stress transmitted by the compacted material.

[0028] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structures, features and principles described in the patent scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. An extruder for producing pig feed, characterized in that: The invention comprises a casing (1), wherein a feed pipe (2) and a drive shaft (3) are arranged on the casing (1), wherein a first spiral blade (4), a second spiral blade (5), a third spiral blade (6) and a fourth spiral blade (7) are arranged on the drive shaft (3) in sequence from close to the feed pipe (2) to far away from the feed pipe (2), wherein the pitch of the third spiral blade (6) is not greater than the pitch of the second spiral blade (5), and a fixing ring (8) is arranged on the outer side of the casing (1), wherein the fixing ring (8) is located between the second spiral blade (5) and the third spiral blade (6), and wherein the fixing ring (8) and the casing (1) are provided with a fixing ring (8). A shear pin (9) is arranged, a die head mounting plate (10) is arranged on one end of the housing (1) away from the feed pipe (2), the die head mounting plate (10) and the drive shaft (3) are movably connected, a die head (11) is arranged on the die head mounting plate (10) outside the drive shaft (3), a plurality of die heads (11) are arranged, and the plurality of die heads (11) are evenly distributed in a star shape outside the drive shaft (3), each die head (11) is provided with a through hole (12), and the diameter of the inner cavity of each through hole (12) gradually increases as the through hole (12) gradually moves away from the fourth spiral blade (7).

2. The expander for producing pig feed according to claim 1, characterized in that: The die head (11) has a stepped shape. The large end of the die head (11) is located on a side close to the fourth spiral blade (7). The die head mounting plate (10) is provided with a pressure plate (13) on a side away from the fourth spiral blade (7). The pressure plate (13) has an annular plate structure. The pressure plate (13) and the housing (1) are provided with fixing bolts (14). The number of the fixing bolts (14) is a plurality. The fixing bolts (14) are evenly distributed in a star shape on the outside of the central axis of the drive shaft (3).

3. The expander for producing pig feed according to claim 1, characterized in that: A watering device and a humidity sensor (15) are alternately arranged on the casing (1) outside the fourth spiral blade (7) in a direction from close to the die head mounting plate (10) to far away from the die head mounting plate (10), and the watering device comprises a pressure equalizing ring (16), a steam delivery pipe (17) and a drainage pipe (18) arranged on the pressure equalizing ring (16), and a nozzle (19) arranged on the pressure equalizing ring (16) and the casing (1).

4. The expander for producing pig feed according to claim 3, characterized in that: The watering device further comprises regulating valves (20) respectively arranged on the steam delivery pipe (17) and the drainage pipe (18); the number of the nozzles (19) in each of the watering devices is a plurality; the plurality of nozzles (19) in each of the watering devices are uniformly distributed in a star shape on the outside of the central axis of the drive shaft (3); and the drainage pipe (18) in each of the watering devices is located at the bottom end of the corresponding pressure equalizing ring (16).

5. The expander for producing pig feed according to claim 1, characterized in that: A fifth spiral blade (21) is provided on the driving shaft (3) between the fourth spiral blade (7) and the die mounting plate (10), and the inner cavity diameter of the casing (1) outside the fifth spiral blade (21) gradually decreases as it approaches the die mounting plate (10).

6. The expander for producing pig feed according to claim 1, characterized in that: A temperature sensor (22) is provided on the casing (1) outside the fourth spiral blade (7).

7. The expander for producing pig feed according to claim 1, characterized in that: A first pulley (23) is arranged on the driving shaft (3) outside the housing (1), a second pulley (24) is arranged below the first pulley (23), a transmission belt (25) is arranged on the second pulley (24) and the first pulley (23), and a driving motor (26) is arranged on the second pulley (24).

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