Spiral wringing machine

Abstract

The utility model discloses a spiral wringing machine which comprises a screen frame and an extrusion shaft which are coaxial, one end of the screen frame is connected with a feeding box body, a discharging box body is arranged below the other end of the screen frame, the extrusion shaft penetrates through the screen frame, spiral blades are wound on the periphery of the extrusion shaft, and the spiral blades are arranged in a multi-section discontinuous mode along the circumference of the extrusion shaft. A tapered enlarged variable-diameter extrusion section is arranged between every two adjacent spiral blades, and one end, close to the discharging box body, of each variable-diameter extrusion section is a large end, so that the diameter of the extrusion shaft is enlarged in a stepped manner in the discharging direction; the inner wall of the screen frame is provided with a plurality of inward convex striker plates, and the inner edge of each striker plate is close to the corresponding variable-diameter extrusion section; and a material turning extrusion section with enlarged volume is arranged between every two adjacent reducing extrusion sections. The screen frame is of an integral half structure, and the two ends of the lower sides of the two half screen frames are hinged to the box body through screen frame pin shafts so that the screen frame can be integrally opened or closed. The spiral squeezing machine is high in squeezing efficiency, the moisture content of materials is low and uniform, the service life of the bearing is prolonged, and the phenomenon that the materials are blocked and cannot be discharged is avoided.

Description

Technical Field

[0001] The utility model relates to a spiral squeezing machine, belongs to the technical field of squeezing equipment and is used for squeezing granular materials. Background Art

[0002] The screw squeezer is a common equipment used for solid-liquid separation and dehydration. It is widely used in agriculture, environmental protection, food processing, papermaking, chemical industry and other fields to process various solid substances with high water content. The screw squeezer uses the rotation of the internal spiral main shaft to separate the liquid in the material by squeezing and separation, thereby achieving the dehydration of solid materials. For example, in the starch industry, corn epidermal fiber and corn germ are first squeezed and dehydrated, and then dried for easy transportation and storage. The moisture content of the material after squeezing and dehydration has a great relationship with the energy consumption of the subsequent drying process, which determines the cost of the drying process. It is an important equipment in the starch processing industry.

[0003] The traditional screw squeezer includes a screen frame and an extrusion shaft. One end of the screen frame is the feed end, and the other end is the discharge end. The extrusion shaft is provided with a spiral blade and extends from the feed end into the screen frame. The spiral main shaft is a continuously variable diameter structure, and the screen frame is a multi-stage half assembly structure. The material enters the annular space between the spiral shaft and the screen frame from the feed end of the screen frame. The annular space gradually narrows. The extrusion shaft rotates under the drive mechanism. The spiral blade pushes the material forward in the screen frame. The material is compressed until it is discharged from the discharge end; the squeezed water flows out from the gap of the screen frame and then discharged through the drain port. The dehydrated material is in a loose, low-water content state, and then enters the next section through the discharge assembly.

[0004] Taking the squeezer in the starch processing industry as an example, the structure of the traditional spiral squeezer causes the material to be compressed with a continuously decreasing volume, and the moisture in the material is gradually squeezed out through the outer screen frame, which has the following problems:

[0005] 1. There is no pressure release and material turning process in the extrusion process. Because the materials are squeezed against each other, the channel for the inner layer materials close to the surface of the spiral main shaft to drain outward is blocked. The moisture of the inner layer materials close to the surface of the spiral main shaft is difficult to be discharged through the screen frame, resulting in inconsistent moisture content of the inner and outer layers of materials. The moisture content of the inner layer material is high, which affects the final total moisture content of the discharged material.

[0006] 2. When the material is subjected to a large extrusion pressure, it may slip as the spiral main shaft rotates inside the screen frame, resulting in no material being discharged;

[0007] 3. At present, the screen frame is a multi-section Haff assembly type. The cost of welding and processing the connecting flange of each section of the screen frame is relatively high. The accumulation of processing and assembly errors leads to excessive straightness of the screen frame, and there will be uneven circumferential clearance between the squeezing spiral main shaft and the screen frame. The uneven clearance between the spiral main shaft and the screen frame will also lead to inconsistent circumferential compression ratios, which will affect the uneven moisture content of the material after extrusion. Utility Model Content

[0008] The utility model aims to overcome the problems existing in the prior art and provide a screw squeezer with high extrusion efficiency, low and uniform moisture content of materials, extended bearing service life and avoid the phenomenon of stalling and failure to discharge materials.

[0009] In order to solve the above technical problems, the utility model provides a spiral squeezing machine, comprising a coaxial screen frame and an extrusion shaft, one end of the screen frame is connected to a feed box, and a discharge box is provided below the other end of the screen frame, the extrusion shaft passes through the screen frame and is wrapped with spiral blades on the outer circumference, the spiral blades are discontinuously arranged in multiple sections along the circumference of the extrusion shaft, and a conically enlarged variable diameter extrusion section is provided between adjacent spiral blades, and the end of each variable diameter extrusion section close to the discharge box is a large end, so that the diameter of the extrusion shaft is stepped along the discharge direction; the inner wall of the screen frame is provided with a plurality of inwardly convex baffle plates, and the inner edge of each baffle plate is close to the corresponding variable diameter extrusion section; a volume-enlarged material turning extrusion section is provided between adjacent variable diameter extrusion sections.

[0010] Furthermore, the closer to the discharge end, the smaller the annular gap between the baffle plate and the variable diameter extrusion section.

[0011] Furthermore, the screen frame is an integral half structure, and the lower ends of the two halves of the screen frame are respectively hinged to the box body through screen frame pins so that the screen frame can be opened or closed as a whole along the full length direction.

[0012] Compared with the prior art, the utility model has achieved the following beneficial effects: 1. After multiple extrusions and turning of the material, the moisture content of the material inside and outside the outlet is lower than that of the commonly used squeezer, which reduces the energy consumption of the subsequent material drying process. For enterprises with continuous production, the energy consumption cost can be reduced significantly in one year;

[0013] 2. Since the screen frame joint surface is equipped with a baffle plate, there will be basically no blocking and material discharge, which can avoid the shutdown and dismantling of the machine due to blocking and material discharge;

[0014] 3. The screen frame is changed from the original multi-section flange assembly to an integrated structure, eliminating the assembly error caused by assembly, avoiding the friction between the spiral shaft and the screen frame or uneven circumferential gap, and eliminating the problem of high moisture content of local materials caused by uneven gap between the screen frame and the spiral main shaft, and causing large eccentric radial force on the spiral main shaft, thus damaging the bearing;

[0015] 4. The number of mounting screws of the screen frame is reduced by more than half, and a screen frame pin is provided, which makes it very convenient to disassemble and install the screen frame. If it is equipped with hydraulic tooling in the later stage, the disassembly and installation of the screen frame will be more convenient, which will greatly reduce the labor intensity and downtime of on-site workers and reduce production losses caused by long downtime. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. The accompanying drawings are only provided for reference and explanation and are not intended to limit the present invention.

[0017] Figure 1 This is the front view of the utility model spiral squeezer with half of the screen frame removed;

[0018] Figure 2 for Figure 1 Stereoscopic image of

[0019] In the figure: 1. feed box; 2. extrusion shaft; 2a. spiral blade; 2b. variable diameter extrusion section; 2c. material turning extrusion section; 3. screen frame; 4. baffle plate; 5. screen frame pin; 6. discharge box. DETAILED DESCRIPTION

[0020] In the following description of the utility model, the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not mean that the device must have a specific direction.

[0021] 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 with reference to specific illustrations.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0023] like Figure 1 , Figure 2As shown, the screw squeezer of the utility model comprises a coaxial screen frame 3 and an extrusion shaft 2, one end of the screen frame 3 is connected to a feed box 1, and a discharge box 6 is provided below the other end of the screen frame 3, the extrusion shaft 2 passes through the screen frame 3 and is wrapped with spiral blades 2a on the outer circumference, the spiral blades 2a are discontinuously arranged in multiple sections along the circumference of the extrusion shaft 2, and a conically enlarged variable diameter extrusion section 2b is provided between adjacent spiral blades 2a, and the end of each variable diameter extrusion section 2b close to the discharge box 6 is a large end, so that the diameter of the extrusion shaft 2 is stepped along the discharge direction, and a plurality of inwardly convex material baffle plates 4 are provided on the inner wall of the screen frame 3, and the inner edge of each material baffle plate 4 is close to the corresponding variable diameter extrusion section 2b; a volume-enlarged material turning extrusion section 2c is provided between adjacent variable diameter extrusion sections 2b.

[0024] The closer to the feeding end, the larger the annular gap between the baffle plate 4 and the variable diameter extrusion section 2b due to the high moisture content of the material. The closer to the discharging end, the smaller the annular gap between the baffle plate 4 and the variable diameter extrusion section 2b due to the decreased moisture content of the material.

[0025] The spiral main shaft of the traditional squeezer is a continuous spiral blade welded on the conical outer surface, and the material is compressed, squeezed and dehydrated by gradually increasing the outer diameter of the shaft and the spacing between the spiral blades. The present device changes the continuous spiral blades on the outer circumference of the extrusion shaft into two or more sections or sets multiple sections of discontinuous spiral blades 2a, and two or more extrusion sections with a suddenly smaller gap with the screen frame 3 are arranged between the discontinuous spiral blades 2a of the extrusion shaft.

[0026] The spiral blade 2a is responsible for conveying the material forward and generating extrusion pressure. The extrusion pressure increases when passing over the variable diameter extrusion section 2b. After passing over the variable diameter extrusion section 2b, the material enters the material turning extrusion section 2c with a larger space volume, so that the material is first released from pressure, and at the same time, the material is turned over, so that the inner layer of material close to the extrusion shaft 2 can be turned over to the screen frame 3. Then, the material is pushed forward again by the spiral blade 2a, and then passes through the next variable diameter extrusion section 2b and the material turning extrusion section 2c. After the material is strongly squeezed with a small gap between the material and the screen frame for many times, the moisture in the material in the entire squeezer cavity is gradually compressed and discharged. Similar to twisting a towel, the structure of the squeezer used to be that the towel was twisted only once, but now the structure has changed to a multiple twisting of the towel after it is twisted dry and then released, and then twisted again after it is released, so that the moisture inside the towel moves to the surface and is twisted out, so that the towel will be twisted drier and have less moisture.

[0027] The material is subjected to a great extrusion pressure during the extrusion process. When the material is blocked from moving forward, it is possible for the material to rotate with the shaft, resulting in the phenomenon of not eating the material or not discharging the material. By adding a protruding material baffle plate 4 at the half joint surface of the screen frame, the material can be prevented from rotating with the shaft under a large extrusion pressure, and the phenomenon of slipping and not discharging the material can be prevented from occurring due to too much resistance at the discharge port.

[0028] The material enters the inner cavity of the equipment from the feed box 1, is pushed forward by the spiral blade 2a, and passes through the variable diameter extrusion section 2b and the turning material extrusion section 2c in turn. As the shaft diameter increases in turn, the compression ratio of the material is gradually increased, so that the moisture in the material is gradually compressed and discharged. The baffle plate 4 at each variable diameter can prevent the material from rotating with the extrusion shaft 2, and prevent the material from slipping and not discharging due to excessive outlet resistance. When the material is conveyed to the turning material extrusion section 2c, the extruded material is released, and the material is turned over during the rotating conveying process. The inner material is turned to the outside, and then passes through the variable diameter extrusion section 2b, so that the original inner material is squeezed and dehydrated from the screen frame side, and then passes through the turning material extrusion section 2c again to enter the next variable diameter extrusion section 2b, and the material is turned over and extruded again, so that the inner and outer materials are fully squeezed and dehydrated, thereby improving the dehydration rate of the material.

[0029] The screen frame 3 adopts an integral half structure, and the lower side is connected to the box body at both ends through the screen frame pin 5. The screen frame 3 is pushed to rotate around the screen frame pin 5 on the side through the hydraulic tooling or hoist guide chain, so that the overall half screen frame can be opened and closed in two halves of the entire length. It will eliminate or reduce the screen frame straightness tolerance caused by the accumulation of processing and assembly errors in the previous multi-section screen frame structure, and can avoid the friction between the squeezed spiral shaft and the screen frame or the uneven circumferential gap that often occurs now, reduce the workload of disassembling the screen frame, and also reduce the structural cost of the screen frame. The screen frame is very convenient to disassemble and install. The screen frame does not need to be lifted up and down manually, and because the installation of the middle flange is reduced, the bolts of multiple sections of splicing flanges are reduced, which reduces the workload of on-site workers to disassemble the screen frame, and the installation screws are reduced by more than 50%, which also reduces the processing cost of the screen frame.

[0030] The filtering part inside the screen frame is assembled with screens or screen bars. In order to prevent the screen joints from being lifted up due to the movement of the material, a fish scale arrangement is adopted along the direction of material movement, which can effectively avoid the screen from being lifted up.

[0031] The above description is only the preferred feasible embodiment of the utility model, which shows and describes the basic principle, main features and advantages of the utility model, but does not limit the scope of patent protection of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments. In addition to the above embodiments, the utility model can also have other implementation modes without departing from the spirit and scope of the utility model. The utility model will also have various changes and improvements. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the utility model. The scope of protection required by the utility model is defined by the attached claims and their equivalents. The technical features not described in the utility model can be achieved by or using existing technologies, which will not be repeated here.

Claims

1. A screw squeezer, comprising a coaxial screen frame and an extrusion shaft, one end of the screen frame is connected to a feed box, and a discharge box is provided below the other end of the screen frame, the extrusion shaft passes through the screen frame and is wound with spiral blades on the periphery, characterized in that: The spiral blades are arranged discontinuously in multiple sections along the circumference of the extrusion shaft, and between adjacent spiral blades there is a conically enlarged variable diameter extrusion section, and the end of each variable diameter extrusion section close to the discharge box is the large end, so that the diameter of the extrusion shaft is stepped along the discharge direction; the inner wall of the screen frame is provided with multiple inwardly convex baffle plates, and the inner edge of each baffle plate is close to the corresponding variable diameter extrusion section; a volume-enlarged material turning extrusion section is provided between adjacent variable diameter extrusion sections.

2. The screw squeezer according to claim 1, characterized in that: The closer to the discharge end, the smaller the annular gap between the baffle plate and the variable diameter extrusion section.

3. The screw squeezer according to claim 1, characterized in that: The screen frame is an integral half structure, and the lower ends of the two half screen frames are respectively hinged to the box body through screen frame pins so that the screen frame can be opened or closed as a whole along the full length direction.

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