Pre-dehydration device before squeezing

Abstract

This utility model discloses a pre-dehydration device before squeezing, comprising a pre-dehydration chamber, within which a rotary dehydration device is installed. The rotary dehydration device includes: a drum screen rotatably disposed within the pre-dehydration chamber and having a plurality of screen holes; a rotary drum base coaxially fixed to the drum screen and extending beyond the feed end of the pre-dehydration chamber; and a drum drive mechanism including a drum motor, a drum reducer, a pinion gear, and a large gear fixedly connected to the rotary drum base. The output shaft of the drum motor is connected to the input end of the drum reducer, and the output shaft of the drum reducer is connected to the pinion gear shaft. A pinion gear is mounted on the pinion gear shaft, meshing with the large gear, and the large gear is fitted and fixed to the outer circumference of the rotary drum base. This device pre-removes a large amount of free water before squeezing and dehydration, reducing energy consumption, and resulting in a low and uniform moisture content in the material.

Description

Technical Field

[0001] This utility model relates to a pre-dehydration device before squeezing, belonging to the technical field of squeezing equipment. Background Technology

[0002] Dewatering machines are widely used in various industries such as food, chemicals, and environmental protection. Their working principle is similar to manually squeezing water from a wet towel; they remove moisture from materials through a screw-type mechanical pressing method, thus achieving dehydration. Dewatering machines primarily separate the liquid from materials through screw extrusion, thereby achieving dehydration. They operate using physical pressing, requiring no external heat source, have a simple structure, and are suitable for a variety of materials. Therefore, dewatering materials before drying reduces energy consumption and drying costs, offering significant economic value.

[0003] Traditional dewatering machines are generally screw extruders, mainly composed of a frame, drive unit, feeding device, extrusion and dewatering device, and discharge device. Material is fed into the extrusion and dewatering section by the feeding device. The distance between the screw shaft and the outer casing of the extrusion and dewatering section is not uniform; the distance from the feeding section to the discharge end gradually decreases. Therefore, as the material advances under the action of the screw shaft in the extrusion and dewatering section, the pressure it experiences also continuously increases. The liquid in the material is squeezed out through the sieve openings of the outer casing, completing the initial dewatering.

[0004] In the starch industry, raw materials such as corn germ and epidermal fiber are initially dehydrated by a dehydrator before drying. Therefore, the dehydration rate of the dehydrator has a great influence on the energy consumption of the subsequent drying process. The higher the dehydration rate in the dehydration stage, the less energy is consumed in the drying stage, and the lower the drying cost.

[0005] Traditional extruders mainly use straight shaft + conical screen, conical shaft + straight screen, or multi-section variable diameter + variable spiral for extrusion and dewatering. None of these methods have an effective pre-dewatering function, resulting in high moisture content at the feed end and excessive leakage at the sealing end, thus leading to poor dewatering performance.

[0006] Chinese utility model patent CN 221349637U discloses a squeeze dryer, including a frame with a channel for materials to pass through; slides symmetrically arranged on both sides of the frame, the length direction of the slides being perpendicular to the direction of material movement; a squeeze roller assembly having two squeeze rollers oppositely arranged on both sides of the direction of material movement; sliding seats at both ends of the squeeze rollers cooperating with the slides; a drying assembly mounted on the frame and located on the discharge side of the squeeze roller assembly; and a roller gap measuring assembly for measuring the distance between the two squeeze rollers. This squeeze dryer avoids introducing moisture into subsequent processes by combining squeezing and drying. However, it requires a larger airflow device, necessitating the addition of a pneumatic cylinder, increasing the footprint and time consumption.

[0007] In the starch industry, traditional extruders primarily use gradually increasing pressure to squeeze out moisture from materials with high humidity. This results in much of the initially squeezed-out free water being trapped between the material particles, making it difficult to dry completely. Furthermore, it leads to inconsistent moisture content between the internal and external materials, with the internal material having a higher moisture content than the external material, which is detrimental to subsequent drying. The presence of a large amount of initially trapped free water at the feed end also makes front-end sealing difficult. Utility Model Content

[0008] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, and such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0009] In view of the problems existing in the above and / or prior art, this utility model is proposed.

[0010] The purpose of this invention is to overcome the problems existing in the prior art and provide a pre-dehydration device before squeezing, which removes a large amount of free water before squeezing and dehydration, reduces energy consumption, and results in low and uniform moisture content of the material.

[0011] To solve the above technical problems, this utility model provides a pre-dehydration device before squeezing, comprising a pre-dehydration chamber, wherein a rotary dehydration device is provided in the pre-dehydration chamber, and the rotary dehydration device includes:

[0012] A drum screen is rotatably disposed within the pre-dehydration tank and has several screen holes;

[0013] A rotating drum seat is coaxially fixed with the drum screen and extends out of the feed end of the pre-dehydration tank;

[0014] The roller drive mechanism includes a roller motor, a roller reducer, a pinion, and a large gear fixedly connected to the rotating roller base. The output shaft of the roller motor is connected to the input end of the roller reducer, and the output shaft of the roller reducer is connected to the pinion shaft. A pinion is mounted on the pinion shaft, and the pinion meshes with the large gear. The large gear is fitted and fixed on the outer periphery of the rotating roller base.

[0015] Furthermore, the inner cavity of the rotating drum seat is coaxially provided with a fixed feed pipe, the inlet end of which is connected to the chute of the feed hopper, and the outlet end of which is connected to the inner cavity space of the drum screen.

[0016] Furthermore, the outlet end of the drum screen is connected to an inner drum retaining ring, the outer circumference of the inner drum retaining ring is evenly distributed with reinforcing ribs, and a supporting drum is sleeved on the outer circumference of the reinforcing ribs. The supporting drum is coaxial with the inner drum retaining ring and serves as a drum track. Three supporting wheel assemblies are symmetrically supported on the outer circumference of the supporting drum.

[0017] Furthermore, the support wheel assembly includes a support wheel frame, a roller shaft, a roller support wheel, and a top shaft screw. The roller support wheel is mounted on the roller shaft via a sliding bearing and abuts against the support roller. The top shaft screw is adjustablely located on the support wheel frame to raise and lower the roller shaft.

[0018] Furthermore, two support wheel assemblies are symmetrically supported on both sides of the bottom of the outlet end of the rotating roller seat.

[0019] Furthermore, the discharge end of the fixed feed pipe is supported in the intermediate bearing seat by an intermediate bearing. The intermediate bearing seat is fixed to the center of the end plate of the discharge end of the rotating drum seat, and the center positioning is achieved by the interlocking of the annular tenon and the annular groove.

[0020] Compared with the prior art, the advantages or beneficial effects of the embodiments of this application include at least the following: 1. The method of combining rotary dehydration and extrusion dehydration is more in line with the material dehydration process; the material enters the rotary dehydration section from the feed port and is pre-dehydrated first, and most of the free water is quickly removed under the action of centrifugal force; then it enters the extrusion section to remove the remaining small amount of free water and bound water, so that the overall water content of the material is low and uniform, and the dehydration rate of one piece of equipment is increased by more than 10%;

[0021] 2. The pre-dehydration and screw extrusion are integrated into one unit. This modular design reduces the floor space required, saves space, and reduces the need for process equipment and piping. It also reduces material handling costs and lowers the investment in this section by 50%.

[0022] 3. It adopts a unique drainage mechanism and multiple sealing mechanisms to solve the problem of water leakage at the feed sealing end, and reduces the maintenance and parts costs for workers;

[0023] 4. The combination of pre-dehydration and screw extrusion causes the material to exhibit a circular to linear motion trajectory. The pre-dehydration mechanism bears gravity and rotational force, while the screw extrusion mechanism bears axial force and rotational force. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The drawings are provided for reference and illustration only and are not intended to limit this utility model. Wherein:

[0025] Figure 1 This is a front view of the pre-dehydration device before squeezing according to this utility model;

[0026] Figure 2 for Figure 1 Enlarged view on the right;

[0027] Figure 3 for Figure 1 Enlarged view of the rotating drum seat section;

[0028] Figure 4 for Figure 1 Enlarged view of the middle support wheel assembly;

[0029] Figure 5 for Figure 1 A three-dimensional image;

[0030] Reference numerals: 1. Feed hopper; 2. Rotary drum base; 2a. Large gear; 2b. Oil seal;

[0031] 3. Fixed feed pipe; 3a. Annular feed channel;

[0032] 4. Intermediate bearing housing; 5. Intermediate bearing; 6. Feed seal seat; 7. Feed seal; 8. Drum screen; 9. Inner drum retaining ring; 10. Support drum;

[0033] 11. Support wheel assembly; 11a. Support wheel frame; 11b. Roller axle; 11c. Roller support wheel; 11d. Sliding bearing; 11e. Top shaft screw; 11f. Oil filler nozzle; 11g. Scale;

[0034] 12. Drum motor; 13. Drum gearbox; 14. Pinion; 14a. Pinion shaft; 15. Pinion bearing housing; 16. Pre-dehydration chamber; 17. Extrusion inlet seat;

[0035] 18. Extrusion rotor; 18a. Extrusion rotor shaft; 18b. Helical blades;

[0036] 19. Squeezing rotor bearing housing; 20. Inlet end support. Detailed Implementation

[0037] In the following description of this utility model, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not mean that the device must have a specific orientation.

[0038] To make the technical means, creative features, achieved objectives and effects of this utility model easier to understand, the present utility model will be further described below with reference to specific illustrations. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0040] like Figures 1 to 5 As shown, the pre-dehydration device before squeezing of this utility model includes a pre-dehydration chamber 16. The extrusion inlet seat 17 is annular and its outer periphery is embedded in the outlet end side wall of the pre-dehydration chamber 16. The two ends of the extrusion rotor 18 are closed and respectively connected to the squeezing rotor shaft 18a. The inlet end of the extrusion rotor 18 extends through the central hole of the extrusion inlet seat 17 into the inner cavity of the pre-dehydration chamber 16, and the spiral blades 18b wound around its outer periphery also extend into the inner cavity of the pre-dehydration chamber 16. The squeezing rotor shaft 18a at the inlet end of the extrusion rotor 18 protrudes from the center of the outer side wall of the pre-dehydration chamber 16, and its outer end is supported on the inlet end bracket 20 by the squeezing rotor bearing seat 19. The bottom of the inlet end bracket 20 is supported on the feed end of the base.

[0041] The inner cavity of the pre-dehydration tank 16 is equipped with a drum screen 8. The drum screen 8 is located on the outer periphery of the inlet end of the extrusion rotor 18 and is coaxial with the extrusion rotor 18. Multiple screen holes are evenly distributed on the circumference of the drum screen 8 for drainage.

[0042] Flanges are welded to both ends of the drum screen 8. The outlet flange of the drum screen 8 is connected to the inner retaining ring 9 of the drum. The inner retaining ring 9 includes a reduced diameter section and a flared opening that connects to the outlet of the drum screen 8. Multiple axially extending and evenly distributed reinforcing ribs are welded to the outer periphery of the drum screen 8 and the inner retaining ring 9 to improve strength. A supporting roller 10 is fitted around the reinforcing ribs of the reduced diameter section of the inner retaining ring 9 as a roller track.

[0043] The outlet end of the inner retaining ring 9 of the roller is embedded in the groove of the extrusion inlet seat 17, with gaps between them to form a labyrinth seal. Water seeping out from the gap is discharged into the pre-dehydration hopper below.

[0044] The outer periphery of the support roller 10 is provided with three support wheel assemblies 11 that abut against the outlet end of its outer wall. The three sets of support wheel assemblies 11 are distributed in an equilateral triangle to support the inner end of the drum screen 8.

[0045] The center holes of the roller support wheel 11c are supported in the middle of the support roller shaft 11b by sliding bearings 11d. A grease nipple 11f is screwed onto the outer end face of the support roller shaft 11b, lubricating the sliding bearing 11d through the grease nipple 11f and the built-in oil hole of the support roller shaft 11b. The bottom ends of both ends of the support roller shaft 11b have cutting surfaces that extend from corresponding guide slots in the support wheel frame 11a. These guide slots extend vertically and directly match the support roller shaft 11b, allowing it to float only up and down. Frame lugs are welded to the bottom of the two outer walls of the support wheel frame 11a, and top shaft screws 11e are screwed onto each frame lug. The upper ends of the two top shaft screws 11e abut against the cutting surfaces at the bottom of the outer ends of the support roller shaft 11b.

[0046] By screwing in or out the top shaft screw 11e, the top shaft screw 11e pushes the support roller shaft 11b to rise or fall, thereby adjusting the height of the roller support rollers 11c, so that all three roller support rollers 11c are in contact with the roller track, and at the same time, the support roller 10 is coaxial with the extrusion rotor 18. A scale 11g is fixed on one side of the guide groove for easy observation or measurement of the height of the support roller shaft 11b.

[0047] The inlet end of the drum screen 8 is connected to a rotating drum seat 2 coaxial with it. The two are fixed to each other by flanges and bolts. The rotating drum seat 2 is located on the outside of the pre-dehydration tank 16. The outer edge of the flange at the outlet end of the rotating drum seat 2 is embedded in the central hole of the side wall at the inlet end of the pre-dehydration tank 16 and is sealed to each other by the skeleton oil seal 2b.

[0048] Two sets of support wheel assemblies 11 are symmetrically arranged below the outlet end of the rotating drum seat 2, and as mentioned above, their height can be precisely adjusted. The roots of the two support wheel frames 11a are fixed to the outer wall of the inlet end of the pre-dehydration tank 16 by screws. The rotating drum seat 2, the drum screen 8, the inner drum retaining ring 9, and the support drum 10 are fixedly connected to form a whole for centrifugal dehydration, and are stably supported at both ends by a total of five drum support wheels 11c.

[0049] The outer diameter of the inlet end of the rotating drum seat 2 is smaller than that of the outlet end, and a large gear 2a is fixed to the outer circumference of the inlet end. A small gear 14 meshes with the bottom of the large gear 2a. The small gear 14 is fixed in the middle of the small gear shaft 14a, and both ends of the small gear shaft 14a are supported in small gear bearing seats 15. The bottom of the two small gear bearing seats 15 is fixed to the base by a bracket. One end of the small gear shaft 14a is connected to the output shaft of the drum reducer 13 through a coupling. The drum reducer 13 is fixed to the base and passes through the hole at the bottom of the inlet end bracket 20. The input end of the drum reducer 13 is driven by the drum motor 12.

[0050] The inner cavity of the rotating drum base 2 is provided with a fixed feed pipe 3 coaxial with it. The outlet end of the fixed feed pipe 3 passes through the center hole of the end plate at the outlet end of the rotating drum base 2, so that the outlet of the fixed feed pipe 3 communicates with the inner cavity space of the drum screen 8. The squeezing rotor shaft 18a at the inlet end of the extrusion rotor 18 passes through the fixed feed pipe 3, and an annular feed channel 3a is formed between the squeezing rotor shaft 18a and the fixed feed pipe 3. The outer side of the rotating drum base 2 is provided with a feed hopper 1, which is fixed to the external steel beam or the connection port. The chute outlet at the lower end of the feed hopper 1 is inserted into the inlet end of the fixed feed pipe 3 and welded to it.

[0051] The inlet end of the fixed feed pipe 3 is provided with a feed sealing seat 6 to seal it. The inner circumference of the feed sealing seat 6 is fitted with a feed sealing element 7 to achieve a seal with the extrusion rotor shaft 18a.

[0052] Material, such as starch, enters the annular feed channel 3a from the feed hopper 1 and then enters the inner cavity of the drum screen 8 along the annular feed channel 3a. The drum motor 12 drives the pinion shaft 14a and the pinion 14 to rotate through the drum reducer 13. The pinion 14 drives the large gear 2a to rotate, and the large gear 2a drives the rotating drum base 2, the drum screen 8, the inner drum retaining ring 9, and the support drum 10 to rotate synchronously. Under the action of centrifugal force, a large amount of free water in the starch that has just been fed in quickly passes through the drum screen 8 for rapid dehydration and falls into the pre-dehydration hopper for discharge. The material after the free water has been removed is fed into the extrusion section by the spiral blades 18b of the extrusion rotor 18, where a small amount of free water and bound water are further extruded.

[0053] An intermediate bearing 5 is provided on the outer wall of the discharge end of the fixed feed pipe 3. The intermediate bearing 5 is installed in the intermediate bearing seat 4 and has sealing rings at both ends to form the first seal. The inner end face of the intermediate bearing seat 4 is fixedly connected to the outlet end plate of the rotating drum seat 2. The end face of the intermediate bearing seat 4 has an annular tenon that fits into the annular groove in the center of the outlet end plate of the rotating drum seat 2 to achieve accurate positioning. The intermediate bearing 5 enables the fixed feed pipe 3 to achieve a stable structure with support at both ends, and at the same time provides auxiliary support for the rotating drum seat 2. The outer ring of the bearing rotates with the rotating drum seat 2.

[0054] The above description is merely a preferred embodiment of the present utility model, showing and describing the basic principles, main features, and advantages of the present utility model. It is not intended to limit the scope of patent protection of the present utility model. Those skilled in the art should understand that the present utility model is not limited to the above embodiments. In addition to the above embodiments, the present utility model may have other implementations without departing from the spirit and scope of the present utility model. Various changes and improvements to the present utility model are also possible. All technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by the present utility model. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents. Technical features not described in the present utility model can be implemented by or using existing technology, and will not be elaborated here.

Claims

1. A pre-dehydration device before squeezing, comprising a pre-dehydration chamber (16), characterized in that: The pre-dehydration tank (16) is equipped with a rotary dehydration device, which includes: A drum screen (8) is rotatably disposed inside the pre-dehydration tank (16) and has a number of screen holes; The rotating drum seat (2) is coaxially fixed with the drum screen (8) and extends out of the feed end of the pre-dehydration box (16); The roller drive mechanism includes a roller motor (12), a roller reducer (13), a pinion (14), and a large gear (2a) fixedly connected to the rotating roller seat (2). The output shaft of the roller motor (12) is connected to the input end of the roller reducer (13), and the output shaft of the roller reducer (13) is connected to the pinion shaft (14a). The pinion (14) is mounted on the pinion shaft (14a), and the pinion (14) meshes with the large gear (2a). The large gear (2a) is fitted and fixed on the outer periphery of the rotating roller seat (2).

2. The pre-dehydration device before squeezing according to claim 1, characterized in that, The inner cavity of the rotating drum seat (2) is coaxially provided with a fixed feed pipe (3), the inlet end of which is connected to the chute of the feed hopper (1), and the outlet end of which is connected to the inner cavity space of the drum screen (8).

3. The pre-dehydration device before squeezing according to claim 1, characterized in that, The outlet end of the drum screen (8) is connected to an inner drum retaining ring (9). The outer periphery of the inner drum retaining ring (9) is evenly distributed with reinforcing ribs. A supporting drum (10) is sleeved on the outer periphery of the reinforcing ribs. The supporting drum (10) is coaxial with the inner drum retaining ring (9) and serves as a drum track. Three supporting wheel assemblies (11) are symmetrically supported on the outer periphery of the supporting drum (10).

4. The pre-dehydration device before squeezing according to claim 3, characterized in that: The support wheel assembly (11) includes a support wheel frame (11a), a roller shaft (11b), a roller support wheel (11c), and a top shaft screw (11e). The roller support wheel (11c) is mounted on the roller shaft (11b) via a sliding bearing (11d) and abuts against the support roller (10). The top shaft screw (11e) is adjustablely located on the support wheel frame (11a) to raise or lower the roller shaft (11b).

5. The pre-dehydration device before squeezing according to claim 3, characterized in that: The bottom of the outlet end of the rotating roller seat (2) is symmetrically supported by two support wheel assemblies (11).

6. The pre-dehydration device before squeezing according to claim 2, characterized in that: The discharge end of the fixed feed pipe (3) is supported in the intermediate bearing seat (4) by the intermediate bearing (5). The intermediate bearing seat (4) is fixed to the center of the end plate of the discharge end of the rotating drum seat (2), and the center positioning is achieved by the interlocking of the annular tenon and the annular groove.

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