Ring dryer

The present invention discloses a ring dryer, comprising a housing, a top cover provided at the top of the housing, and a base provided at the bottom of the housing, and further comprising a feeding system into which the material to be dried flows, a material coating assembly, a material extrusion assembly, a discharging scraper, and at least two cylinders with different radii, wherein each of the cylinders is provided with a heat medium flow path inside, an annular groove is formed between the adjacent cylinders, and a material outlet is provided at a free end of the feeding system; the material to be dried in the feeding system flows into the annular groove along the material outlet; the material coating assembly, the material extrusion assembly and the discharging scraper are movably arranged in the annular groove and can move along the annular groove relative to the cylinders; and a blade of the discharging scraper is respectively in contact with an inner circumferential surface of the cylinder and an outer circumferential surface of the adjacent cylinder. The present invention has the advantages in that the drying area of the material to be dried is increased, and the material to be dried does not need to be vigorously stirred by the components of the present invention so as to reduce friction between the material to be dried and the components, thereby extending the service life.

TECHNICAL FIELD

The present invention relates to the technical field of drying of slurry materials, and in particular to a ring dryer.

BACKGROUND ART

There are many types of conductive heat transfer dryers, among which hollow paddle dryers are widely used in the drying of slurry materials. Heat exchange components of a hollow paddle dryer include a hollow paddle and a housing with a heating jacket. Due to the full contact with a slurry material, the heat exchange components have high surface utilization and high heat conduction efficiency. However, because the material is continuously stirred and turned by the paddle, there are problems such as wear of the paddle and large power consumption.

SUMMARY OF THE INVENTION

An object of the present invention is to solve the deficiencies of the prior art and provide a ring dryer.

The technical solution of the present invention is:

a ring dryer, comprising a housing, a top cover provided at the top of the housing, and a base provided at the bottom of the housing, and further comprising a feeding system into which the material to be dried flows, a material coating assembly, a material extrusion assembly, a discharging scraper, and at least two cylinders with different radii, wherein each of the cylinders is provided with a heat medium flow path inside, an annular groove is formed between the adjacent cylinders, and a material outlet is provided at a free end of the feeding system; the material to be dried in the feeding system flows into the annular groove along the material outlet; the material coating assembly, the material extrusion assembly and the discharging scraper are movably arranged in the annular groove and can move along the annular groove relative to the cylinders; and a blade of the discharging scraper is respectively in contact with an inner circumferential surface of the cylinder and an outer circumferential surface of the adjacent cylinder.

In a preferred solution, the material extrusion assembly comprises an outer extrusion belt, an inner extrusion belt, an outer extrusion circular roll and an inner extrusion circular roll, wherein the outer extrusion circular roll drives the outer extrusion belt to rotate and move along the annular groove, and the outer extrusion belt is in contact with the inner circumferential surface of the cylinder; and the inner extrusion circular roll drives the inner extrusion belt to rotate and move along the annular groove, and the inner extrusion belt is in contact with the outer circumferential surface of the adjacent cylinder.

In a preferred solution, the outer extrusion belt and the inner extrusion belt are arranged parallel to each other, and a separation circular roll is provided between the outer extrusion belt and the inner extrusion belt.

In a preferred solution, the material coating assembly comprises a pair of material spreading circular rolls and a pair of material spreading plates, the pair of material spreading circular rolls being longitudinally arranged in the annular groove and parallel to an axis of the housing, wherein one end of one material spreading plate is close to one material spreading circular roll, and the other end thereof forms a distributing port together with the inner circumferential surface of the cylinder, and one end of the other material spreading plate is close to the other material spreading circular roll, and the other end thereof forms a distributing port together with the outer circumferential surface of the adjacent cylinder.

In a preferred solution, the material coating assembly further comprises a material distributor, wherein the material distributor comprises several uniform distribution pipes in parallel, the material outlet of the feeding system is connected in a butt joint with a feeding port of the uniform distribution pipe on the inner side, and the uniform distribution pipe on the outer side is provided with several dispatching ports in sequence from top to bottom.

In a preferred solution, an annular plate is provided at the top of the cylinder, toothing holes are uniformly distributed around the annular plate, a first gear is provided at the top of the outer extrusion circular roll, a second gear is provided at the top of the inner extrusion circular roll, the first gear rotates along the toothing holes of the annular plate, and the second gear rotates along the toothing holes of the adjacent annular plate.

In a preferred solution, the feeding system is transversely arranged in the housing and can rotate around the axis of the housing, the free end of the feeding system is connected to an upper connecting plate, the top of the discharging scraper is connected to the upper connecting plate, the top of the material coating assembly is connected to the upper connecting plate, the top of the material extrusion assembly is connected to the upper connecting plate, the bottom of the discharging scraper is connected to a lower connecting plate, the bottom of the material coating assembly is connected to the lower connecting plate, and the bottom of the material extrusion assembly is connected to the lower connecting plate.

In a preferred solution, the ring dryer further comprises a rotating shaft, wherein an annular rake rod is provided inside the base, and the rake rod is fixedly connected to the feeding system by means of the rotating shaft.

In a preferred solution, the bottom of the housing is provided with a heat medium inlet pipe and a heat medium outlet pipe, wherein the heat medium inlet pipe is connected to an inlet of the heat medium flow channel of the cylinder, and the heat medium outlet pipe is connected to an outlet of the heat medium flow channel of the cylinder.

In a preferred solution, the top cover is provided with a gas discharge port and a material inlet, and the material inlet is connected to the feeding port of the feeding system.

By combining the above technical solutions, the present invention has the beneficial effects in that the material to be dried is uniformly coated on the inner circumferential surface and the outer circumferential surface of the cylinders, thereby increasing the drying area of the material to be dried to ensure the material to be dried to receive heat continuously and steadily; and the material to be dried does not need to be vigorously stirred by the components of the present invention so as to reduce the friction between the material to be dried and the components, thereby extending the service life while reducing the power consumption.

The description above is only summary of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly for implementation according to the contents of the specification, and in order to make the above and other objectives, features and advantages of the present invention more apparent and easy to be understood, the preferred embodiments are especially taken as examples in conjunction with the accompanying drawings, and the detailed description is as follows.

DETAILED DESCRIPTION OF EMBODIMENTS

As shown inFIGS. 1 and 2, a ring dryer used for drying a slurry material comprises a housing20, a top cover10provided at the top of the housing20, and a base30provided at the bottom of the housing20, and further comprises a feeding system40into which the material to be dried flows, a material coating assembly50, a material extrusion assembly60, a discharging scraper70, and at least two cylinders21with different radii.

As shown inFIGS. 1-4, 10 and 11, the cylinder21is of a cylindrical structure, and a heat medium flow channel212is provided inside the cylinder21. In the present invention, the cylinder21is a cylinder having a ring-shaped cavity provided inside, the ring-shaped cavity forms the heat medium flow channel212, or a baffle plate is arranged in the ring-shaped cavity to form the heat medium flow channel212. The cylinder21is fixedly arranged in the housing20, an annular groove22is formed between the adjacent cylinders21, and the cylinder21and the housing20are coaxially arranged. The feeding system40is transversely arranged in the housing20and can rotate around an axis of the housing20. The feeding system40is composed of a cross rod41and a feeding pipe42or composed of a cross rod41and a feeding disc. A pipe wall of the feeding pipe42is provided with a material outlet43, or the bottom of the feeding disc is provided with a material outlet43, and the number of the material outlet43is equal to the number of the annular groove22. When the feeding system40is composed of the cross rod41and the feeding pipe42, the number of the cross rod41and of the feeding pipe42is equal to the number of the annular groove22. Each feeding pipe42is provided with a material outlet43, and the material to be dried in the feeding system40flows into the annular groove22along the material outlet43. The material coating assembly50, the material extrusion assembly60and the discharging scraper70are movably arranged in the annular groove22and can move along the annular groove22relative to the cylinder21, and a blade of the discharging scraper70is respectively in contact with an inner circumferential surface of the cylinder21and an outer circumferential surface of the adjacent cylinder21. In the present invention, the feeding system40is transversely arranged in the housing20and can rotate around the axis of the housing20, the free end of the feeding system40is connected to an upper connecting plate27, the top of the discharging scraper70is connected to the upper connecting plate27, the top of the material coating assembly50is connected to the upper connecting plate27, the top of the material extrusion assembly60is connected to the upper connecting plate27, the bottom of the discharging scraper70is connected to a lower connecting plate28, the bottom of the material coating assembly50is connected to the lower connecting plate28, and the bottom of the material extrusion assembly60is connected to the lower connecting plate28. The upper connecting plate27is of a ring shape and is provided with a hole29for passage of the material outlet43, the upper connecting plate27is provided with holes29for connecting with the top of the discharging scraper70, the top of the material coating assembly50and the top of the material extrusion assembly60; and the lower connecting plate28is provided with holes29through which the dried material passes and enter the base30, the lower connecting plate28is of a ring shape and is provided with holes29for connecting with the bottom of the discharging scraper70, the bottom of the material coating assembly50and the bottom of the material extrusion assembly60. The feeding system40and the upper connecting plate27can be detachably connected, can be connected by a pneumatic cylinder, or can be connected by an elastic member, such as connected by a spring. For example, when the feeding system40is connected to the upper connecting plate27by a spring, when the feeding system40is suddenly turned, the spring provides a buffer action on the activation of the upper connecting plate27, thereby protecting the discharging scraper70, the material coating assembly50and the material extrusion assembly60connected to the upper connecting plate27. The discharging scraper70is connected to the upper connecting plate27and the lower connecting plate28, the blades of the discharging scraper70are respectively in contact with the inner circumferential surface of the cylinder21and the outer circumferential surface of the adjacent cylinder21, and the dried material on the inner circumferential surface of the cylinder21and on the outer circumferential surface of the adjacent cylinder21can be scraped off by the discharging scraper70. The material to be dried in the feeding system40flows to the annular groove22along the material outlet43, and under the action of an external force, the feeding system40, the material coating assembly50, the material extrusion assembly60and the discharging scraper70move along the annular groove22relative to the cylinder21, and the material to be dried is coated on the inner circumferential surface of the cylinder21and the outer circumferential surface of the adjacent cylinder21by the material coating assembly50. The heat medium is introduced into the heat medium flow channel212, and the materials to be dried on the inner circumferential surface of the cylinder21and the outer circumferential surface of the adjacent cylinder21is dried by the heat medium, and at the same time, the dried material is scraped off by the discharging scraper70. The discharging scraper70is of a V-shaped structure, and during the movement of the discharging scraper70along the annular groove22, the dried material on the inner circumferential surface of the cylinder21and on the outer circumferential surface of the adjacent cylinder21is simultaneously scraped off by the discharging scraper70. Because both the inner circumferential surface of the cylinder21and the outer circumferential surface of the adjacent cylinder21are coated with the material to be dried, the area of the material to be dried is increased, thereby improving the drying efficiency, and at the same time, during the drying, the material to be dried has less friction with the components in the present invention, thereby extending the service life of the present invention.

Specifically, as shown inFIG. 1, the material extrusion assembly60comprises an outer extrusion belt61, an inner extrusion belt62, an outer extrusion circular roll63and an inner extrusion circular roll64. The outer extrusion circular roll63drives the outer extrusion belt61to rotate and move along the annular groove22, and the outer extrusion belt61is in contact with the inner circumferential surface of the cylinder21, so that the outer extrusion belt61tightly presses the material to be dried onto the inner circumferential surface of the cylinder21; and the inner extrusion circular roll64drives the inner extrusion belt62to rotate and move along the annular groove22, and the inner extrusion belt62is in contact with the outer circumferential surface of the adjacent cylinder21, so that the inner extrusion belt62tightly presses the material to be dried onto the outer circumferential surface of the adjacent cylinder21. Both the outer extrusion belt61and the inner extrusion belt62are made of a flexible and breathable material, which can be one or any combination of porous rubber, porous soft plastic, a porous metal sheet, a metal net, a non-metal net, metal cloth, non-metal cloth, foamed plastic, a chain plate, a bamboo mat and a straw mat. The outer extrusion belt61and the inner extrusion belt62are respectively parallel to the circumferential walls of the cylinders21, and a separation circular roll65is provided between the outer extrusion belt61and the inner extrusion belt62. Because the outer extrusion belt61and the inner extrusion belt62have the same angular velocity, and the linear velocity of the outer extrusion belt61is greater than the linear velocity of the inner extrusion belt62, in order to prevent the outer extrusion belt61and the inner extrusion belt62from being damaged by extrusion and friction against each other during rotation, the separation circular roll65is provided between the outer extrusion belt61and the inner extrusion belt62, and the outer extrusion belt61and the inner extrusion belt62form a double-track structure. During the rotation and movement of the outer extrusion belt61and the inner extrusion belt62, the material to be dried is tightly attached to the inner circumferential surface of the cylinder21by the outer extrusion belt61so as to prevent the material to be dried on the inner circumferential surface of the cylinder21from falling off, the inner extrusion belt62makes the material to be dried close to the outer circumferential surface of the adjacent cylinder21and prevents the material to be dried on the outer circumferential surface of the adjacent cylinder21from falling off.

Specifically, as shown inFIGS. 2 to 5, the material coating assembly50comprises a pair of distributing circular rolls51and a pair of distributing plates52, the pair of distributing circular rolls51being longitudinally arranged in the annular groove22and parallel to the housing20, wherein one end of one distributing plate52is close to one distributing circular roll51, and the other end thereof forms a distributing port54together with the inner circumferential surface of the cylinder21; and one end of the other distributing plate52is close to the other distributing circular roll51, and the other end thereof forms a distributing port54together with the outer circumferential surface of the adjacent cylinder21. The included angle between the distributing plate52and the inner circumferential surface of the cylinder21or the outer circumferential surface of the adjacent cylinder21can be adjusted as required to further adjust the size of the distributing port54. When the distributing circular roll51rotates and moves along the annular groove22, the distributing circular roll51extrudes the material to be dried so that the material to be dried is in the shape of a uniform sheet, and the extruded material to be dried enters from the distributing port54and is attached to the inner circumferential surface of the cylinder21or the outer circumferential surface of the adjacent cylinder21.

As shown inFIGS. 1, 2 and 6, an annular plate23is provided at the top of each cylinder21, and toothing holes24are uniformly distributed around the annular plate23, a first gear25is provided at the top of the outer extrusion circular roll63, a second gear26is provided at the top of the inner extrusion circular roll64, the first gear25rotates along the toothing holes24of the annular plate23, and the second gear26rotates along the toothing holes24of the annular plate23. An upper roller group66is provided at the top of the outer extrusion circular roll63and the top of the inner extrusion circular roll64, and the top of the outer extrusion circular roll63is connected to the top of the inner extrusion circular roll64by means of the upper roller group66; and a lower roller group67is provided at the bottom of the outer extrusion circular roll63and the bottom of the inner extrusion circular roll64, and the bottom of the outer extrusion circular roll63is connected to the inner extrusion circular roll64by means of the lower roller group67.

As shown inFIGS. 2, 4 and 7-9, the material coating assembly50further comprises a material distributor53, the material distributor53comprises several uniform distribution pipes531in parallel, the material outlet43of the feeding system40is connected in a butt joint with the feeding port of the uniform distribution pipe531on the inner side, and the uniform distribution pipe531on the outer side is provided with several dispatching ports532in sequence from top to bottom. The direction of the arrows inFIG. 8indicates the flow direction of the material to be dried, the material to be dried flows from the material outlet43of the feeding system40to the feeding port of the material distributor53, and under the action of the uniform distribution pipe531, the material to be dried is uniformly distributed in the vertical direction, so that the material to be dried can be uniformly coated on the inner circumferential surface of the cylinder21and the outer circumferential surface of the adjacent cylinder21.

As shown inFIG. 1, the bottom of the housing20is provided with a heat medium inlet pipe210and a heat medium outlet pipe211, the heat medium inlet pipe210is connected to an inlet of the heat medium flow channel212of the cylinder21, and the heat medium enters the heat medium flow channel212of the cylinder21from the heat medium inlet pipe210, and the material to be dried on the inner circumferential surface of the cylinder21and on the outer circumferential surface of the adjacent cylinder21is dried by the heat medium flowing through the heat medium flow channel212. The heat medium outlet pipe211is connected to an outlet of the heat medium flow channel212of the cylinder21.

As shown inFIG. 1, the top cover10is provided with a gas discharge port11and a material inlet12, and the material inlet12is connected to the feeding port of the feeding system40. After the dried material is dried, water vapor is generated, and the water vapor is discharged from the gas discharge port11.

As shown inFIG. 1, an annular rake rod31is provided inside the base30, and the shaft center of the rake rod31is fixedly connected to the shaft center of the feeding system40by means of a rotating shaft32provided. An electric motor33is further provided inside the base30, and the electric motor33drives the rotating shaft32to rotate.

As shown inFIG. 1, in the present invention, the rake rod31is connected to the rotating shaft32by means of a shaft holder35, several horizontally arranged rake blades34are mounted on the rake rod31, and the rake blades34are detachably connected to the rake rod31. The rake rod31and the rake blades34are located inside the base30, and bottom ends of the rake blades34are in contact with a bottom surface of the base30to move the dried material such that the dried material moves to the discharge port36.

As shown inFIG. 1, the working process of the present invention is:

a water-containing slurry material to be dried enters the feeding system40from the material inlet12, the material to be dried flows into the material distributor53of the material coating assembly50, the material to be dried is uniformly distributed in the vertical direction by the material distributor53, the feeding system40drives the material coating assembly50, the material extrusion assembly60and the discharging scraper70to move along the annular groove22, the material to be dried is uniformly coated onto the inner circumferential surface of the cylinder21and the outer circumferential surface of the adjacent cylinder21by the material coating assembly50, and then the material to be dried is extruded and fixed by the outer extrusion belt61and the inner extrusion belt62of the material extrusion assembly60; and a heat medium enters the heat medium flow channel212, heat is transferred to the material to be dried through the inner circumferential surface of the cylinder21and the outer circumferential surface of the adjacent cylinder21such that the moisture contained in the material to be dried is vaporized and evaporated, the water vapor is discharged from the gas discharge port11, and the dried material is scraped off by the discharging scraper70and is finally discharged out of the ring dryer from the discharging port36.

For a second embodiment, the difference between this embodiment and the first embodiment is in that the number of the cylinders21can be set as required. In this embodiment, the number of the cylinders21is 2 to 30, annular grooves22are formed between the adjacent cylinders21, the feeding system40is provided with the same number of material outlets43as the annular grooves22, the material to be dried in the feeding system40flows into the annular groove22along the corresponding material outlet43. The material coating assembly50, the material extrusion assembly60and the discharging scraper70are movably arranged in the annular groove22and can move along the annular groove22relative to the cylinder21, and a blade of the discharging scraper70is respectively in contact with an inner circumferential surface of the cylinder21and an outer circumferential surface of the adjacent cylinder21. The structure of the material coating assembly50is the same as that in the first embodiment, the material coating assembly50is provided with a material distributor53, the structure of the material distributor53is the same as that in the first embodiment. The structure of the material extrusion assembly60is the same as that in the first embodiment.

The content described above is merely illustrative of specific embodiments of the present invention, and it should be noted that for those of ordinary skill in the art, various improvements and modifications would have been made without departing from the principle of the present invention, and these improvements and modifications should be construed as falling within the scope of protection of the present invention.