Roller scraper dryer

Abstract

Hollow rotating shafts are connected to the centers of inwards-concave sealing heads at the two ends of a roller respectively, rotating joints are installed at the outer ends of the rotating shafts respectively, and a plurality of annular reinforcing ribs are arranged on the inner wall of the roller; the inner end of the drainage end rotating shaft extends into an inner cavity of the roller body, the inner wall of the drainage end concave end socket is connected with a plurality of drainage guide plates, each drainage guide plate extends to the inner wall of the roller body from the periphery of the drainage end hollow rotating shaft along a spiral line, and a plurality of groups of drainage holes are formed in the circumference of the inner end of the drainage end hollow rotating shaft; a material spraying pipe and a scraper device are arranged on the two sides of the roller body respectively, a scraper clamping device is welded to the circumference of a scraper pipe shaft, a scraper blade is fixed to the free end of the scraper clamping device, and the blade point of the scraper blade is close to the outer wall of the roller. A scraper driving arm is fixedly connected to a scraper shaft head at one end of the scraper pipe shaft, the free end of the scraper driving arm is hinged to the end of a piston rod of an air cylinder, and the cylinder bottom of the air cylinder is hinged to the rack. The dryer is high in heat exchange efficiency and long in service life.

Description

Technical Field

[0001] The utility model relates to a dryer, in particular to a drum scraper dryer, belonging to the technical field of drying equipment. Background Art

[0002] In the chemical, dye, pharmaceutical, food, metallurgical and other industries, a large amount of high-salt wastewater is generated during the production process. These wastewaters often contain a variety of harmful substances and extremely high pH. For such high COD and high-salt wastewater, effective measures must be taken to treat it to avoid causing serious environmental pollution.

[0003] Currently, scraper drum dryers are commonly used to dry waste salt mother liquor. Their operating principle is as follows: The scraper drum dryer's spray pipe evenly sprays the waste salt mother liquor onto the outer wall of the drum, forming a film. Heat is transported through the pipe to the inner wall of the drum, then to the outer wall, and then to the film, evaporating moisture from the film and drying the wet material. The dried material is then scraped off the drum surface by a scraper device and scattered into a trough below the scraper. A conveyor collects the dry material and packages it.

[0004] The Chinese utility model patent with publication number CN 219797736U discloses a drum scraper dryer that is convenient for discharging. It includes a base, a raw material box opened on the inner side of the bottom of the base, a drying drum rotatably connected to the upper side of the middle part of the base, and the bottom of the drying drum rotates inside the raw material box. It also includes: an annular rail, the annular rail is fixed to the inner side of the top of the base, the annular rail is located on both sides of the drying drum and is parallel to the end of the drying drum; an adjustable annular knife handle, the adjustable annular knife handle is limited and slides on the inner side of the annular rail, and a scraper is fixed to the top of the end of the adjustable annular knife handle away from the annular rail, and the outer wall of the scraper abuts the outer wall of the drying drum.

[0005] The technical solution and the existing technology have the following problems: 1. The roller has a large deformation during operation, resulting in poor scraping effect of the scraper;

[0006] 2. The hydrophobic effect inside the drum is poor, which affects the drying efficiency, and the hydrophobic structure is difficult to maintain;

[0007] 3. The scraper is easy to rust and break, and has poor reliability, which affects the operating efficiency of the equipment;

[0008] 4. Uneven spraying can easily cause material accumulation on the drum surface, affecting the drying effect. Utility Model Content

[0009] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and utility model title of this application, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0010] In view of the above problems and / or the problems existing in the prior art, the present utility model is proposed.

[0011] The purpose of the utility model is to overcome the problems existing in the prior art and provide a drum scraper dryer with high drum strength, high heat exchange efficiency and long service life.

[0012] To solve the above technical problems, the utility model provides a drum scraper dryer, comprising a drum body located in the inner cavity of a protective cover, wherein two ports of the drum body are respectively provided with concave heads, the centers of the two concave heads are respectively connected to hollow rotating shafts, the outer ends of the two hollow rotating shafts respectively extend out of the protective cover and are respectively equipped with rotary joints, and the inner wall of the drum body is provided with multiple annular reinforcing ribs;

[0013] The inner end of the hollow shaft at the drainage end extends to the inner cavity of the drum body. The inner wall of the concave end of the drainage end is connected to multiple drain guide plates. Each drain guide plate extends from the outer circumference of the hollow shaft at the drainage end along a spiral line to the inner wall of the drum. Multiple groups of drainage holes are provided on the circumference of the inner end of the hollow shaft at the drainage end, which communicate with the root space of adjacent drain guide plates.

[0014] Both sides of the drum body are respectively provided with a spray pipe and a scraper device parallel to the busbar of its outer wall, the scraper device includes a scraper tube shaft, a scraper clamping device is welded on the circumference of the scraper tube shaft, a scraper blade is fixed to the free end of the scraper clamping device, and the blade edge of the scraper blade is close to the outer wall of the drum body; a scraper shaft head at one end of the scraper tube shaft extends out of the guard cover, a scraper drive arm is fixedly connected to the scraper shaft head, the free end of the scraper drive arm is hinged to the piston rod end of the cylinder, and the cylinder bottom of the cylinder is hinged to the frame.

[0015] As an improvement of the present invention, the scraper shaft head is also fixedly connected to a radially extending limit arm, and the frame is fixed with a limit block. When the limit arm rests on the limit block, the gap between the blade edge of the scraper blade and the outer wall of the drum body is minimized.

[0016] As a further improvement of the present invention, the inner wall of the drum body is provided with spiral reinforcement ribs, and the spiral reinforcement ribs are guided upward toward the drainage end of the drum body.

[0017] As a further improvement of the present invention, a cleaning pipe is provided in the inner cavity of the shield, and the cleaning pipe is U-shaped and semi-enclosed on the outer side of the drum body.

[0018] Compared with the existing technology, the utility model has achieved the following beneficial effects: 1. The cylinder adopts a hollow cylindrical structure with reinforcing ring ribs inside, which plays a supporting role for the cylinder and improves the strength and rigidity of the cylinder; it is conducive to maintaining the relative position between the outer wall of the cylinder and the scraper;

[0019] 2. Both ends of the drum are concave heads. There is no hollow tube shaft in the inner cavity. The rotating shafts at both ends are hollow shafts welded to the concave heads and reinforcing ribs. Single-channel rotary joints are installed at the shaft ends. Steam is inletted at one end and drained at the other end. A self-sealing hydrophobic structure is used to continuously drain water during the rotation of the drum.

[0020] 3. Spiral ribs are added inside the drum to push the condensed water in the drum, making it easier to scoop out water. This helps to completely drain the condensed water, improve heat exchange efficiency, and eliminate the need for subsequent maintenance.

[0021] 4. Improve the way the scraper fits with the outer surface of the drum, increase the limit of the scraping device, avoid excessive friction between the scraper and the outer wall of the drum causing a shortening of the service life, so that the scraper can not only remove dry materials but also reduce scraper wear.

[0022] 5. The nozzle structure of the rear spray pipe is improved to improve spraying uniformity and drying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. The drawings are only provided for reference and explanation, and are not intended to limit the present invention. Among them:

[0024] Figure 1 This is a three-dimensional diagram of the utility model drum scraper dryer;

[0025] Figure 2 This is the main view of the utility model drum scraper dryer;

[0026] Figure 3 This is a side sectional view of the utility model drum scraper dryer;

[0027] Figure 4 It is a cross-sectional view of the roller assembly in the present utility model;

[0028] Figure 5 This is a cross-sectional view of the cleaning pipe in the present utility model;

[0029] Figure 6 This is a three-dimensional diagram of the scraper device in the present invention;

[0030] Figure 7 This is a three-dimensional diagram of the spray pipe in the utility model;

[0031] Figure 8 This is a cross-sectional view of the self-sealing hydrophobic device of the present invention;

[0032] In the figure: 1. Frame; 2. Rotary joint; 3. Limit arm; 4. Scraper drive arm; 5. Cylinder; 6. Exhaust port; 7. Shield; 8. Drive motor; 9. Spray pipe; 10. Cleaning pipe; 11. Roller assembly; 12. Hollow shaft at the air inlet end; 13. Annular reinforcement rib; 14. Spiral reinforcement rib; 15. Self-sealing hydrophobic device; 16. Hollow shaft at the drainage end; 17. Bearing seat; 18. Large sprocket; 19. Small sprocket; 20. Scraper device; 21. Scraper shaft head; 22. Scraper clamping device; 23. Scraper blade; 24. Scraper pipe shaft; 25. Concave head at the drainage end; 26. Hydrophobic guide plate. DETAILED DESCRIPTION

[0033] In the following description of the present invention, 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 present invention and simplifying the description, and do not mean that the device must have a specific direction.

[0034] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below with reference to specific figures. Obviously, the embodiments described are only a part of the present invention, not all of the embodiments.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art 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.

[0036] like Figures 1 to 8 As shown, the drum scraper dryer of the present invention includes a frame 1, a protective shield 7, a drive motor 8, a spray pipe 9, a cleaning pipe 10, a drum assembly 11, and a scraper device 20. Both ends of the drum assembly 11 are supported on the frame 1. The protective shield 7 covers the outer periphery of the drum assembly 11, and the top of the protective shield 7 is provided with an exhaust port 6. The drive motor 8 is fixed to one end of the frame 1. A small transmission sprocket 19 is fixed to the output end of the drive motor 8. A large sprocket 18 is mounted on the same side of the shaft end of the drum assembly 11. The small transmission sprocket 19 meshes with the large sprocket 18 to achieve a first-stage reduction transmission, driving the drum assembly 11 to rotate.

[0037] The drum assembly 11 includes a drum body, a hollow rotating shaft 12 at the air inlet end, an annular reinforcement rib 13, a spiral reinforcement rib 14, a self-sealing hydrophobic device 15 and a hollow rotating shaft 16 at the drainage end. The two ends of the drum body are respectively provided with concave heads. The hollow rotating shaft 12 at the air inlet end and the hollow rotating shaft 16 at the drainage end are respectively connected to the center of the concave heads and are respectively supported on the frame 1 through bearing seats 17.

[0038] The inner wall of the drum body is uniformly supported by multiple annular reinforcement ribs 13, and the inner wall of the drum body is also wrapped with spiral reinforcement ribs 14. The root of the hollow shaft 12 at the air inlet end is connected to the center of the concave head at the drum's air inlet end. The inlet end of the hollow shaft 12 is equipped with a rotary joint 2 for steam intake. The root of the hollow shaft 16 at the drain end is connected to the center of the concave head at the drum's drain end. The inner wall of the concave head is equipped with a self-sealing drain device 15, and the outlet end of the hollow shaft 16 is also equipped with a rotary joint for drainage.

[0039] The self-sealing drain device 15 includes a concave drain end seal 25, drain deflectors 26, and a hollow drain shaft 16. The inner end of the hollow drain shaft 16 passes through the center of the concave drain end seal 25. Three drain deflectors 26 are connected to the inner wall of the concave drain end seal 25. Each drain deflector 26 extends from the outer circumference of the hollow drain shaft 16 along a spiral line toward the inner wall of the cylinder. The inner end of the hollow drain shaft 16 is provided with three rows of drainage holes that communicate with the base spaces of adjacent drain deflectors 26.

[0040] Saturated steam enters the drum body through the rotary joint 2 and the hollow shaft 12 at the air inlet end, heating the drum. The resulting condensed water is pushed by the spiral reinforcement ribs 14 to the self-sealing drain device 15. The self-sealing drain device 15 scoops the condensed water into the drain guide plate 26. As the drain guide plate 26 rotates, the condensed water gathers near the root of the hollow shaft 16 at the drain end, forming a water seal at the root of the drain guide plate 26. Under the action of gravity and saturated steam pressure, the condensed water enters the central channel of the drain end hollow shaft 16 and is discharged. This eliminates the need for a drain valve, changing the intermittent drainage of the drain valve to continuous drainage.

[0041] The spray pipe 9 is located within the inner cavity of the shield 7 and close to the outer wall of the drum body. The axis of the spray pipe 9 is parallel to the axis of the drum body, and multiple spray holes facing the drum body are evenly distributed along the length of the spray pipe 9. As the drum rotates, the mixed salt mother liquor is evenly sprayed from the spray pipe 9 onto the outer wall of the drum body. After being spin-dried, it is scraped off and discharged by the scraper device 20 on the opposite side.

[0042] The scraper device 20 includes a scraper shaft head 21, a scraper clamping device 22, a scraper blade 23 and a scraper tube shaft 24. The root of the scraper clamping device 22 is fixedly connected to the scraper tube shaft 24, and the scraper blade 23 is clamped at the free end of the scraper clamping device 22; the scraper shaft head 21 passes through the protective cover 7 and is connected to a scraper drive arm 4 extending radially outward, the cylinder 5 is fixed on the frame, and the free end of the piston rod of the cylinder 5 is hinged to the free end of the scraper drive arm 4.

[0043] During operation, the piston rod of the cylinder 5 drives the scraper tube shaft 24 to rotate through the scraper driving arm 4, so that the scraper blade 23 is tightly attached to the outer wall of the drum body. The degree of fit and the pressing force are adjusted by the limit arm 3. The root of the limit arm 3 is welded to the axial end of the scraper shaft head 21 and extends radially outward. A limit block matching the limit arm 3 is fixed on the frame 1. When the limit arm 3 rests on the limit block, the scraper tube shaft 24 rotates to the limit position, thereby accurately controlling the gap between the scraper blade 23 and the outer wall of the cylinder.

[0044] A cleaning pipe 10 is located within the inner cavity of the shroud 7. Its midsection is parallel to the cylinder axis, and its two bent ends are parallel to the cylinder ports. This pipe automatically cleans the surfaces of the shroud 7 and the drum body at regular intervals. When the cleaning valve is opened, cleaning liquid is sprayed through the spray pipe onto the outer wall of the drum and then through the cleaning nozzle into the trough, simultaneously performing high-temperature cleaning.

[0045] The above description is only a preferred embodiment of the present invention, which shows and describes the basic principles, main features and advantages of the present invention, but does not limit the scope of patent protection of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. In addition to the above embodiments, the present invention may have other implementation methods without departing from the spirit and scope of the present invention. The present invention may also have various changes and improvements, and all technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention. The scope of protection required by the present invention is defined by the attached claims and their equivalents. Technical features not described in the present invention can be achieved by or using existing technologies, and will not be described here.

Claims

1. A drum scraper dryer, comprising a drum body located in the inner cavity of a shield, wherein two ports of the drum body are respectively provided with concave heads, characterized in that: The centers of the two concave heads are respectively connected with hollow rotating shafts, the outer ends of the two hollow rotating shafts respectively extend out of the shield and are respectively installed with rotating joints, and the inner wall of the drum body is provided with multiple annular reinforcing ribs; The inner end of the hollow shaft at the drainage end extends to the inner cavity of the drum body. The inner wall of the concave end of the drainage end is connected to multiple drain guide plates. Each drain guide plate extends from the outer circumference of the hollow shaft at the drainage end along a spiral line to the inner wall of the drum. Multiple groups of drainage holes are provided on the circumference of the inner end of the hollow shaft at the drainage end, which communicate with the root space of adjacent drain guide plates. Both sides of the drum body are respectively provided with a spray pipe and a scraper device parallel to the busbar of its outer wall, the scraper device includes a scraper tube shaft, a scraper clamping device is welded on the circumference of the scraper tube shaft, a scraper blade is fixed to the free end of the scraper clamping device, and the blade edge of the scraper blade is close to the outer wall of the drum body; a scraper shaft head at one end of the scraper tube shaft extends out of the guard cover, a scraper drive arm is fixedly connected to the scraper shaft head, the free end of the scraper drive arm is hinged to the piston rod end of the cylinder, and the cylinder bottom of the cylinder is hinged to the frame.

2. The drum scraper dryer according to claim 1, characterized in that: The scraper shaft head is also fixedly connected to a limit arm extending in the radial direction, and the frame is fixed with a limit block. When the limit arm abuts against the limit block, the gap between the edge of the scraper blade and the outer wall of the drum body is minimized.

3. The drum scraper dryer according to claim 2, characterized in that: The inner wall of the drum body is provided with spiral reinforcement ribs, and the spiral reinforcement ribs are guided upward toward the drainage end of the drum body.

4. The drum scraper dryer according to claim 1, 2 or 3, characterized in that: The inner cavity of the shield is provided with a cleaning pipe, and the cleaning pipe is U-shaped and semi-enclosed on the outside of the drum body.

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