CN114877637B

CN114877637B - Steam rotary dryer

Info

Publication number: CN114877637B
Application number: CN202210794379.2A
Authority: CN
Inventors: 王宏耀; 李晓光; 吴静; 邢召良; 张翠勋; 张晓伟; 于磊; 倪春林; 金澎
Original assignee: Shandong Tianli Energy Co ltd
Current assignee: Shandong Tianli Energy Co ltd
Priority date: 2022-07-07
Filing date: 2022-07-07
Publication date: 2022-09-09
Anticipated expiration: 2042-07-07
Also published as: CN114877637A

Abstract

The invention provides a steam rotary dryer, which belongs to the technical field of drying equipment and comprises a cylinder body, a front riding wheel device, a rear riding wheel device, a transmission device and a discharging cover surrounding part of the cylinder body; the shell of the discharging cover surrounds to form a discharging cavity, and a discharging opening for discharging dry materials is arranged on the shell of the cylinder in the discharging cavity; a plurality of heating units rotating along with the cylinder are arranged in the cylinder, each heating unit is communicated with a steam distribution chamber, and the steam distribution chamber is connected with a rotary joint; the discharge end plate is arranged inside the cylinder and is positioned between the end part of the discharge end of the cylinder and the discharge hole. The steam rotary dryer provided by the invention can effectively reduce the time and workload consumed in the installation of the heat exchange tube, and can accurately judge the leakage point when the heat exchange tube is leaked by steam and needs to be replaced, so that the damaged heat exchange tube can be replaced quickly and accurately; the materials are uniformly distributed in the cylinder body, the front riding wheel and the rear riding wheel are uniformly stressed, the discharging sealing service life of the cylinder body is long, and the drier is not easy to damage.

Description

Steam rotary dryer

Technical Field

The invention belongs to the technical field of drying equipment, and particularly relates to a split type annular pipe steam rotary dryer.

Background

In the prior art, the steam rotary dryer is structurally characterized in that a plurality of circles of steam heat exchange pipes are arranged in a cylinder in a concentric circle mode, and steam enters from a rotary joint and is distributed to the heat exchange pipes through a steam header. The material to be dried is conveyed into the cylinder of the dryer by the conveying machine, is dried under the lifting and stirring action of the heat exchange tube in the cylinder, is discharged from the lower end of the inclined cylinder, enters the discharging cover and enters the next process through the discharge opening arranged at the lower end of the discharging cover. An air outlet is arranged at the upper part of the discharging cover, and water and impurity gases vaporized in the process of drying materials and dust carried by the impurity gases are discharged through the air outlet by a fan. The above prior art has the following disadvantages:

1. the single heat exchange tube is arranged in the cylinder in a concentric circle mode for a plurality of circles, the heat exchange tube occupies 15% -25% of the capacity of the cylinder, the filling rate of the material to be dried in the cylinder is reduced, the size of drying equipment needs to be increased for obtaining the same treatment capacity, and the manufacturing cost is increased.

2. When the heat exchange tubes are installed or the heat exchange tubes are worn or corroded in the using process to cause steam leakage and need to be replaced, the maintenance time is long and the workload is large due to the large number of the single heat exchange tubes.

3. When the dryer works, if the heat exchange tube leaks, the leakage point of the heat exchange tube is difficult to judge, all steam pipelines need to be closed in time, and materials in the dryer barrel are rapidly cooled, agglomerated, wall-adhered and tube-adhered due to loss of heat sources. After the steam pipeline is closed, the residual steam leakage in the heat exchange pipe can also aggravate the caking, wall sticking and pipe sticking of the materials, and the difficulty in cleaning the materials in the dryer is caused.

4. The heat exchange tubes start from a steam header box at the discharge end and extend to the feed end in the cylinder, and because the heat exchange tubes have the same tube spacing, materials to be dried with poor wet flowability and good dry flowability are easy to accumulate at the feed end due to poor flowability, the filling rate at the feed end is high, and the surfaces of the heat exchange tubes can basically contact with the materials; and because of the good material fluidity at the discharge end, the packing rate of the material is less, and only the partial heat exchange tube close to the wall surface of the cylinder body can contact with the material, which causes the waste of heat exchange area. And because the material to be dried is unevenly distributed at the feeding and discharging end of the cylinder, the stress of the front and rear riding wheels of the dryer is uneven, the abrasion of the front and rear riding wheels is inconsistent, the rotation precision of the dryer is influenced, and the dryer is easily damaged.

5. In order to introduce the material to be dried and moisture-carrying gas into the cylinder of the dryer, an opening needs to be formed in the feeding end plate, and the material to be dried is easy to overflow from the opening in the feeding end plate when the dryer works, so that the environment is polluted.

6. The overflow weir in the cylinder body of the drying machine is not provided with an adjusting device, or although the adjusting device is arranged, the adjusting device is arranged in the cylinder body and is not easy to operate, so that much inconvenience is brought to the adjusting operation.

7. The steam header box is used as a heat carrying element, is exposed in the atmospheric environment, can spread the heat to the surrounding environment, exceeds the tolerance of human body for the personnel of patrolling and examining can not be close to, and then can not patrol and examine vulnerable heating elements such as rotary joint, have the potential safety hazard.

8. Because the material is inhomogeneous in the barrel that distributes, the packing rate of feed end department is big, and discharge end department packing rate is less, causes the trend that the barrel has the discharge end orientation gliding, and the sealed comparison in the sealed easy inefficacy of the ejection of compact of keeping away from the discharge end plate of the last ejection of compact that is close to the discharge end plate of ejection of compact cover. The ejection of compact cover sets up and is close to ejection of compact end plate department between ejection of compact end plate and feeding end plate, and after the sealed inefficacy of the ejection of compact that is close to the ejection of compact end plate, the material disperses to the surrounding environment in, and these leakage materials can not be collected, not only cause the loss and the waste of material, polluted environment moreover.

Disclosure of Invention

The invention aims to provide a steam rotary dryer, which has a larger heat exchange area under the condition that the cylinder has the same diameter and length specification, and reduces the processing and manufacturing cost.

A further object of the present invention is to provide a steam rotary dryer, which can integrate a plurality of heat exchange pipes into one heating unit, and only a small number of heating units are distributed in the cylinder, so as to achieve the purpose of quickly and conveniently replacing all or part of the heat exchange pipes by replacing the heating units.

The invention further aims to provide a steam rotary dryer, which can reasonably arrange the tube spacing of the heat exchange tubes at the feed end and the discharge end aiming at the characteristics of poor wet flowability and good dry flowability of materials, so that the materials are uniformly distributed at the feed end and the discharge end of the cylinder body, and the stress of a bearing part of the dryer is balanced; the material is fully contacted with all the heat exchange tubes on the cross sections of the feeding and discharging ends in the cylinder body, so that the heat of the heat exchange tubes is more efficiently utilized. Meanwhile, the materials are more uniformly distributed from the feeding end to the discharging end in the cylinder body, so that the dryer can be in a stable working state, and the situation that the cylinder body slides down is controlled to occur.

A further object of the present invention is to provide a steam rotary dryer, which prevents the whole steam input pipeline of the dryer from being completely closed after the heat exchange pipes of one or more heating units are worn and leaked, thereby preventing the materials in the cylinder from caking, wall sticking, pipe sticking and the like caused by the loss of heat source. Meanwhile, after steam leaks due to abrasion of the heat exchange tubes in the dryer, the leakage of the heat exchange tube of the heating unit can be quickly determined, and then the steam input of the heating unit can be cut off in a targeted manner, so that the normal use of other heating units is not influenced.

A further object of the present invention is to provide a steam rotary dryer, which can re-convey the material overflowing from the opening of the feeding end plate into the drum, complete the drying process, and prevent the material from overflowing from the feeding end.

A further object of the present invention is to provide a steam rotary dryer, which is provided with an overflow weir adjusting device that is more convenient to adjust, and is easy to adjust the quality of the dried product.

A further object of the present invention is to provide a steam rotary dryer in which the discharge hood is divided into a discharge chamber and a heat insulation chamber by a partition plate. The discharge end plate is arranged in the discharge cavity of the discharge cover, and the discharge end plate is far away from the discharge sealing device under the condition that the length of the straight pipe of the heat exchange pipe is not increased, so that the materials in the cylinder are prevented from being accumulated close to the discharge sealing device, and the leakage of the materials at the discharge sealing device can be effectively prevented. Meanwhile, the spacing distance between the discharge end plate and the nearest group of pipe supports close to the discharge end can be shortened, the stability of the heating unit during working is ensured, and the heating unit is convenient to mount and dismount.

A further object of the present invention is to provide a steam rotary dryer, in which the discharge cover of the dryer is divided into a discharge chamber and a heat insulation chamber by a partition plate, so that a heat carrying element such as a steam distribution chamber of the dryer is wrapped in the heat insulation chamber of the discharge cover, thereby preventing the heat carrying element from affecting the surrounding environment. Meanwhile, a certain positive pressure state is kept in the heat insulation cavity of the discharging cover, and the state can reduce leakage of materials from a gap between the heat exchange tube and the discharging end plate. Meanwhile, the heat insulation cavity of the discharge cover is used as a collecting device for overflowing materials after the discharge sealing device close to the discharge end plate fails, a cleaning port is formed in the lower end of the heat insulation cavity, and leaked materials are discharged intermittently and timely. And meanwhile, an observation door is arranged on the side wall of the heat insulation cavity of the discharge cover and used for observing the condition that the metal hose group and the steam distribution chamber have no damage, or observing the indication of a metal hose pressure gauge, or closing a valve.

In order to achieve the above object, the present invention provides the following technical solutions.

A steam rotary dryer comprising:

a drum 15 for containing the material to be dried, the drum 15 having a cylindrical housing 151;

a front riding wheel device 20 and a rear riding wheel device 22 for supporting the barrel 15;

a transmission device 21 for driving the cylinder 15 to rotate;

the cylinder 15 is provided with a feeding end and a discharging end, the feeding end is provided with a feeding end plate 17, the feeding end plate 17 is provided with an opening for receiving materials to be dried, the discharging end is provided with a discharging end plate 6 and a fixed discharging cover 8 surrounding part of the cylinder 15, the shell of the discharging cover 8 is surrounded to form a discharging cavity 803, and a plurality of discharging openings 152 for discharging the dried materials are arranged on the shell 151 of the cylinder 15 in the discharging cavity 803;

the lower part of the discharging chamber 803 is provided with a discharging opening 23 for discharging materials, and the upper part is provided with an air outlet 9 for discharging moisture and impurities vaporized in the drying process of the materials;

a plurality of heating units 12 rotating along with the cylinder body 15 are arranged in the cylinder body 15, each heating unit 12 comprises two straight pipes 121 parallel to the rotating axis of the cylinder body 15 and a plurality of arc-shaped pipes 122 which are connected with the two straight pipes 121 and are parallel to each other, the straight pipes 121 extend out of the discharging end plate 6 and are communicated with the steam distribution chamber 4, and the steam distribution chamber 4 is connected with the rotary joint 2;

a straight pipe sealing device is arranged between the discharging end plate 6 and the straight pipe 121, and comprises a stuffing box 601 connected with the discharging end plate 6, a gland 603 connected with the stuffing box 601, and stuffing 602 filled between the stuffing box 601 and the gland 603;

the discharging end plate 6 is arranged inside the cylinder 15 and located between the end part of the discharging end of the cylinder 15 and the discharge opening 152, the shell 151 is connected with the discharging end plate 6 and extends towards the discharging end, and the extending shell 151 is connected with the side wall 802 of the discharging cavity 803 through the discharging sealing device 7.

Further, a steam rotary dryer as described above:

the outer side of the side wall 802 of the discharging cavity 803 is provided with an insulating cavity 801, and the discharging cavity 803 and the insulating cavity 801 are divided into two cavities isolated from each other by the side wall 802;

the steam distribution chamber 4 is arranged in the heat insulation chamber 801, and the rotary joint 2 is arranged outside the heat insulation chamber 801.

Further, a steam rotary dryer as described above:

a positive pressure state is maintained in the insulating chamber 801.

Further, a steam rotary dryer as described above:

the two straight pipes 121 of any one heating unit 12 are respectively connected to the steam distribution chamber 4 through a metal hose group 5, one end of the metal hose group 5, which is connected with the straight pipes 121, is a flexible element, and the other end is a rigid element;

a valve 51 and/or a pressure gauge 52 are arranged on the rigid element of the metal hose group 5 corresponding to any one or more heating units 12.

Further, a steam rotary dryer as described above:

the arc-shaped pipe 122 of the heating unit 12 is arranged in the cylinder 15 along the circumferential direction by taking the rotation axis of the cylinder 15 as the center;

the center-to-center spacing of adjacent arced tubes 122 of each heating unit 12 at the feed end region of the barrel 15 is greater than the center-to-center spacing of adjacent arced tubes 122 at the discharge end region of the barrel 15.

Further, a steam rotary dryer as described above:

the heating unit 12 divides the cross section of the cylinder into two or more regions, and the number of the divided regions is N, so that the feeding end plate 17 is divided into N independent units, and each independent unit of the feeding end plate 17 is detachably connected with the flange at the feeding end of the cylinder 15.

Further, a steam rotary dryer as described above:

arranging an overflow weir 10 adjacent to the discharge port 152 in the cylinder 15 on one side of the discharge port 152 close to the feed end, wherein the overflow weir 10 comprises N independent sector plates 101, the sector plates 101 are fixed on the inner wall of the shell 151 of the cylinder 15, an adjusting plate 102 is arranged between every two adjacent sector plates 101, and the adjusting plate 102 is fixedly connected with a rotating shaft 103;

the adjusting plate 102 is provided with a plurality of semi-long-strip-shaped hole-shaped grooves, each of the semi-long-strip-shaped hole-shaped grooves comprises a semi-circular arc which is positioned close to the center of the adjusting plate 102 and two straight line sections which extend from two ends of the semi-circular arc to the edge of the adjusting plate 102, each of the two straight line sections forms an opening at the edge of the adjusting plate 102, and the straight pipe 121 of the heating unit 12 is arranged in the groove and is in clearance fit with the groove;

the rotating shaft 103 rotatably penetrates through the shell 151 of the cylinder 15 and extends, a packing sealing device 104 is arranged between the outer wall of the shell 151 and the rotating shaft 103, the packing sealing device 104 is connected with the bearing supporting structure 105, packing is filled between the packing sealing device 104 and the bearing supporting structure 105, and the bearing supporting structure 105 is fixed on the outer wall of the shell 151 through a stud;

adjusting plate 102 is fixedly attached to stub shaft 107 near the axis of rotation of barrel 15. stub shaft 107 is received in bearing housing cavity 108. bearing housing cavity 108 is fixedly attached to sector plate 101 by support plate 106.

The steam rotary dryer provided by the invention can effectively reduce the time and workload consumed in the installation of the heat exchange tube, and can accurately judge the leakage point when the heat exchange tube is worn or corroded to generate steam leakage in the use process and needs to be replaced, so that the damaged heat exchange tube can be replaced quickly and accurately; the materials are uniformly distributed in the cylinder, the filling rates of the feeding end region and the discharging end region are basically the same, the front riding wheel and the rear riding wheel are uniformly stressed, the discharging sealing device at the discharging end of the cylinder is long in service life, and the dryer is not easy to damage.

Drawings

FIG. 1 is a schematic structural view of a rotary steam dryer provided by the present invention;

FIG. 2 is a schematic sectional view A-A of FIG. 1;

FIG. 3 is a schematic view of the heating unit of the rotary steam dryer provided by the present invention;

FIG. 4 is a partially enlarged view of portion B of FIG. 1;

FIG. 5 is a schematic right side view of the cartridge of FIG. 1;

FIG. 6 is a schematic cross-sectional view C-C of FIG. 1;

FIG. 7 is an enlarged view of a portion D of FIG. 6;

FIG. 8 is an enlarged view of a portion E of FIG. 1;

fig. 9 is a partially enlarged view of portion F of fig. 8.

Wherein, 1, a condensate outlet, 2, a rotary joint, 3, a steam inlet, 4, a steam distribution chamber, 5, a metal hose group, 6, a discharge end plate, 7, a discharge sealing device, 8, a discharge cover, 9, an exhaust port, 10, an overflow weir, 11, a rear rolling ring, 12, a heating unit, 13, a pipe support, 14, a large gear ring, 15, a cylinder body, 16, a front rolling ring, 17, a feeding end plate, 18, a feeding short pipe, 19, a material returning spiral, 20, a front riding wheel device, 21, a transmission device, 22, a rear riding wheel device, 23, a sector port, 24, a cleaning port, 51, a valve, 52, a pressure gauge, 101, a plate, 102, an adjusting plate, 103, a rotating shaft, 104, a packing sealing structure, 105, a bearing supporting structure, 106, a supporting plate, 107, a short shaft, 108, a bearing seat cavity, 121, a straight pipe, 122, an arc pipe, 151, a shell, 152, a packing, 602. filler, 603 gland, 801 insulation chamber, 802 side wall, 803 discharge chamber.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure of the present invention.

The structures, ratios, sizes, and the like of the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the efficacy and the achievable purpose of the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

The following examples are for illustrative purposes only. The various embodiments may be combined, and are not limited to what is presented in the following single embodiment.

Referring to fig. 1, the main body of the steam rotary dryer provided by the invention is a cylinder 15, the cylinder 15 has a cylindrical shell 151, the left part of the cylinder 15 is a discharging end region, the right part of the cylinder 15 is a feeding end region, the left end of the cylinder 15 is provided with a discharging end plate 6 for closing the discharging end of the cylinder 15, the right end of the cylinder 15 is provided with a feeding end plate 17 for closing the feeding end of the cylinder 15, the cylinder 15 is rotatably supported by a front riding wheel device 20 and a rear riding wheel device 22 through a front rolling ring 16 and a rear rolling ring 11 which are assembled on the cylinder 15, and a transmission device 21 drives a large gear ring 14 fixed on the cylinder 15 to rotate so as to drive the cylinder 15 to rotate around an axis. The cylinder 15 is installed obliquely, the feeding end is high, and the discharging end is low.

The material to be dried enters the cylinder body 15 through the feeding short pipe 18, is lifted and scattered by the heating unit 12 along with the rotation of the cylinder body 15, is dried by utilizing various heat exchange modes such as convection, conduction and radiation, moves from the feeding end to the discharging end by means of the inclination of the cylinder body 15, is discharged from a discharging opening 152 arranged on a discharging end shell 151 of the cylinder body 15, enters the discharging cover 8 and is finally discharged through a discharging opening 23 arranged at the bottom of the discharging cover 8.

The moisture-carrying gas used for carrying moisture removed in the drying process enters the cylinder body 15 from the feeding short pipe 18 under the action of the fan, runs downstream with the materials in the cylinder body 15, and is finally discharged out of the dryer through the exhaust port 9 arranged on the discharging cover 8.

The heat required for drying is provided by external steam. The steam enters the steam distribution chamber 4 from the steam inlet 3 on the rotary joint 2 at the discharge end of the dryer and is distributed uniformly to the heating units 12 by the metal hose groups 5. The condensed water formed by the condensation of the steam during the drying process flows from the heating unit 12 into the steam distribution chamber 4 through the metal hose set 5 under the action of gravity as the drum 15 rotates. The condensed water is collected continuously, a liquid level with a certain height is formed at the bottom of the steam distribution chamber 4, and the condensed water is discharged out of the dryer through the condensed water outlet 1 under the siphon action.

Referring to fig. 1, 2 and 3, the main body of the steam rotary dryer provided by the invention is a rotary cylinder 15, a plurality of circles of heating units 12 are arranged in the direction of the inner section of the cylinder in a concentric circle manner, each heating unit is composed of a straight pipe 121 which runs through the whole length of the cylinder and is parallel to each other and a plurality of arc-shaped pipes 122 connected between the two straight pipes, a plurality of pipe supports 13 are arranged in the cylinder 15 at intervals in the axial direction and the circumferential direction of the cylinder 15, the two straight pipes 121 of each heating unit 12 are detachably connected to two pipe supports 13 adjacent in the circumferential direction, and the bottom end of each pipe support 13 is fixed on a shell 151. According to the material flow characteristics, two adjacent arc pipes 122 of the same heating unit 12 can be arranged at different intervals, and if the material flow is good, the arc pipes 122 are arranged at the same interval within the whole length of the cylinder. If the material flowability is poor, the arc-shaped pipes 122 are arranged at a larger interval at the feed end of the cylinder, and a smaller central pipe distance is arranged at the discharge end of the cylinder. The distribution of the materials in the cylinder body is more uniform, and the stress of the front riding wheel device 20 and the rear riding wheel device 22 of the dryer is more uniform.

Referring to fig. 2, in the steam rotary dryer provided by the present invention, the arc-shaped pipes 122 of the heating unit 12 are arranged in the cylinder 15 along the circumferential direction with the rotation axis of the cylinder 15 as the center, and are arranged in the cylinder 15 in the concentric circle arrangement manner on the cross section of the cylinder, so that the cylinder 15 has a larger pipe distribution area in a unit volume compared with a case of using straight heat exchange pipes penetrating the entire length of the cylinder 15. Generally, the same heat exchange area is achieved, and the dryer arranged in a concentric circle mode has a smaller diameter or a shorter cylinder length specification than the dryer arranged in a straight pipe mode, so that the material cost and the processing and manufacturing cost are reduced.

Taking the embodiment provided in fig. 2 as an example, if the diameter of the dryer cylinder 15 is 3600 mm, under the condition that the axial length of the cylinder 15 is the same, the cylinder 15 has 5 × 4=20 heating units, and if a straight heat exchange pipe penetrating the entire length of the cylinder is adopted, 160 heat exchange pipes need to be arranged to have the same heat exchange area as the 20 heating units. The heating unit integrated into a group provided by the invention undoubtedly greatly improves the installation and replacement efficiency and the heat exchange efficiency of the heat exchange pipe.

Referring to fig. 4, the present invention provides a heating unit 12 of a steam rotary dryer in which two parallel straight pipes 121 extending throughout the entire length of a drum 15 are connected to a steam distribution chamber 4 through a metal hose group 5. The set of metal hoses 5 is provided with a flexible element at one end for compensating for mounting errors of the heating unit 12 to the steam distribution chamber 4 and a rigid element at the other end. Preferably, a valve 51 and a pressure gauge 52 are mounted on the rigid element of the metal hose set 5 corresponding to one or more heating units 12 which are easily worn or corroded, the pressure gauge 52 is used for detecting whether the heating unit leaks, and when the heating unit leaks steam, the steam is prevented from entering the heating unit continuously by closing the valve 51, and the continuous use of other heating units is not influenced.

Referring to fig. 2 and 5, in the steam rotary dryer provided by the invention, four groups of heating units 12 divide the cross section of the cylinder 15 into four areas, the feeding end plate 17 corresponding to the cylinder 15 is divided into four units, the feeding end plate 17 is detachably connected with a cylinder flange, when a certain heating unit needs to be overhauled or replaced, only a single feeding end plate unit corresponding to the heating unit needs to be dismantled, and one heating unit is integrally extracted from the cylinder 15 from a feeding end, so that the heating unit is overhauled and replaced more conveniently and quickly, and the downtime of the dryer is reduced. Obviously, it is easy to understand that three groups of heating units can be adopted to divide the cross section of the barrel 15 into three regions, or five groups of heating units can be adopted to divide the cross section of the barrel 15 into five regions, and the feeding end plate 17 of the barrel 15 corresponding to the five groups of heating units is divided into three units or five units.

Referring to fig. 1, the steam rotary dryer provided by the invention is characterized in that a feeding short pipe 18 is connected to a feeding end plate 17, a material returning spiral 19 is welded on the feeding short pipe 18, materials overflowing from the feeding end plate 17 or thrown out of the cylinder body by the rotation of the cylinder body 15 enter a cavity of the feeding short pipe 18, and enter the inside of the cylinder body 15 again under the action of the material returning spiral 19.

Referring to fig. 6 and 7, the steam rotary dryer provided by the invention corresponds to the arrangement of the heating unit 12 in the cylinder 15, the overflow weir 10 is composed of four separate fan-shaped plates 101, the fan-shaped plates 101 are welded on the inner wall of the cylinder 15, a regulating plate 102 with a groove is arranged between the two fan-shaped plates 101, the regulating plate 102 is welded with a rotating shaft 103, and the rotating shaft 103 is rotated to enable the regulating plate 102 and the fan-shaped plates 101 to form a certain angle, so that the purpose of controlling the flow rate of the drying material is achieved. Obviously, it is easy to understand that the number of sector plates 101 constituting the overflow weir 10 corresponds to the number of heating units 12 dividing the cross section of the barrel 15 into three regions, and when three groups of heating units are adopted to divide the cross section of the barrel 15 into three regions, or five groups of heating units are adopted to divide the cross section of the barrel 15 into five regions, the overflow weir 10 corresponding thereto is constituted by three sector plates 101 units or five sector plates 101 units.

The adjusting plate 102 is provided with a plurality of semi-elongated hole-shaped grooves, each of the semi-elongated hole-shaped grooves comprises a semi-circular arc located near the center of the adjusting plate 102 and two straight lines extending from two ends of the semi-circular arc to the edge of the adjusting plate 102, and each of the two straight lines forms an opening at the edge of the adjusting plate 102. The straight tube 121 of the heating unit 12 is placed in the groove and is in clearance fit with the groove, ensuring that the adjusting plate 102 does not interfere with the heating unit 12 when rotating.

The rotating shaft 103 extends out of the barrel 15, a packing sealing structure 104 is arranged outside the barrel 15, in order to conveniently adjust the angle between the adjusting plate 102 and the sector plate 101, a bearing supporting structure 105 is arranged outside the packing sealing on the rotating shaft 103, the bearing supporting structure 105 is fixed on the outer wall of the barrel 15 through a stud, and meanwhile, the end part of the rotating shaft 103 is processed into a hexagon head structure.

For good support of adjustment plate 102, adjustment plate 102 near the central axis of barrel 15 is welded with stub shaft 107, stub shaft 107 is received in bearing seat cavity 108, and bearing seat cavity 108 is fastened to sector plate 101 of weir 10 by support plate 106.

Referring to fig. 6 and 7, the present invention provides a steam rotary dryer, the overflow weir adjusting device of which comprises an adjusting plate 102, a rotating shaft 103, a packing structure 104, a bearing support structure 105, a support plate 106, a short shaft 107 and a bearing seat chamber 108. The overflow weir adjusting device is mainly used for adjusting the through flow of the drying materials.

The overflow weir adjusting device is arranged on one side of the outer part of the discharging cover 8 close to the feeding end of the cylinder body 15, so that the adjustment work of the overflow weir 10 can be completed in short down time.

As shown in fig. 1 and 8, in the steam rotary dryer provided by the present invention, the discharging cover 8 is divided into two chambers, namely a heat insulation chamber 801 and a discharging chamber 803, by a side wall 802 near the end of the discharging end, the discharging chamber 803 is used for discharging the dried material and the moisture-carrying gas, and the heat insulation chamber 801 is used as a heat insulation chamber for isolating the heat dissipation of the steam distribution chamber 4 and the metal hose set 5 from the atmospheric environment, so as to reduce the heat loss, facilitate the collection of the leaked material of the discharging end plate 6, and improve the field operation environment. The heat insulation chamber 801 is provided with an observation door for observing the damage of the metal hose group 5 and the steam distribution chamber 4, or observing the indication of the metal hose pressure gauge 52, or closing the valve 51.

Meanwhile, a certain positive pressure state is kept in the heat insulation chamber 801 of the discharging cover, and the positive pressure state can inhibit the material leakage amount generated in the gap between the straight pipe 121 of the heating unit 12 and the discharging end plate 6. Meanwhile, the heat insulation chamber 801 is used as a collecting device for leaked materials, the cleaning port 24 is arranged at the lower end of the heat insulation chamber 801, and the leaked materials are intermittently and timely discharged.

The discharging end plate 6 is arranged in the cylinder body 15, and the discharging end plate 6 is arranged between the side wall 802 close to the discharging end and the discharging opening 152 of the discharging cover 8 in the axis direction of the cylinder body 15, the shell 151 of the cylinder body 15 is connected with the discharging end plate 6 and extends to the discharging end to connect the side wall 802 close to the discharging end of the discharging cover 8, under the condition that the length of the straight pipe 121 is not increased, the discharging end plate 6 is far away from the discharging sealing device 7, the material in the cylinder body 15 is prevented from being accumulated at the position close to the discharging sealing device 7, the leakage of the material at the discharging sealing device 7 can be effectively prevented, meanwhile, the spacing distance between the discharging end plate 6 and the nearest group of pipe supports 13 close to the discharging end can be shortened, the stability of the heating unit 12 in working is ensured, and the installation and the disassembly are convenient. In addition, it is also ensured that a sufficient space is left between the discharging end plate 6 and the steam distribution chamber 4, so that a sealing device is added between the discharging end plate 6 and the straight pipe 121, as shown in fig. 9, and the sealing device is composed of a stuffing box 601, a stuffing 602 and a gland 603.

According to the steam rotary dryer provided by the invention, when a heat exchange pipe is worn or corroded to generate steam leakage in the using process and needs to be replaced, the reading of the pressure gauge 52 is observed to accurately judge which heating unit 12 is leaked, so that the valve 51 is operated to be closed, a damaged heating pipe is quickly and accurately replaced, and the time and the workload consumed in replacing and installing the heat exchange pipe are effectively reduced; the discharging end plate 6 is far away from the discharging sealing device 7, so that the accumulation and leakage of materials at the discharging sealing device 7 can be effectively prevented, meanwhile, the mechanical supporting structure of the discharging end plate 6 and the pipe support 13 on the heating unit 12 is optimized, and the heating unit 12 is more stable in work; the pipe spacing of the arc-shaped pipes 122 of the heating unit 12 is arranged in different areas of the feeding end and the discharging end, so that the materials are distributed more uniformly in the cylinder, the filling rates of the feeding end area and the discharging end area are basically the same, the stress of the front supporting wheel and the rear supporting wheel is uniform, the service life of the discharging sealing device at the discharging end of the cylinder is long, and the dryer is not easy to damage.

It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.

The steam rotary dryer provided by the invention is described in detail above. The principles and embodiments of the present invention have been described herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. A steam rotary dryer comprising:

a drum (15) for receiving the material to be dried, the drum (15) having a cylindrical housing (151);

a front riding wheel device (20) and a rear riding wheel device (22) for supporting the cylinder body (15);

a transmission device (21) for driving the cylinder (15) to rotate;

the cylinder body (15) is provided with a feeding end and a discharging end, the feeding end is provided with a feeding end plate (17), the feeding end plate (17) is provided with an opening for receiving materials to be dried, the discharging end is provided with a discharging end plate (6) and a fixed discharging cover (8) surrounding part of the cylinder body (15), the shell of the discharging cover (8) is surrounded to form a discharging cavity chamber (803), and a plurality of discharging openings (152) for discharging the dried materials are formed in a shell body (151) of the cylinder body (15) in the discharging cavity chamber (803);

the lower part of the discharging chamber (803) is provided with a discharging opening (23) for discharging materials, and the upper part is provided with an air outlet (9) for discharging moisture and impurities vaporized in the material drying process;

a plurality of heating units (12) which rotate along with the cylinder body (15) are arranged in the cylinder body (15), each heating unit (12) comprises two straight pipes (121) which are parallel to the rotation axis of the cylinder body (15) and a plurality of arc-shaped pipes (122) which are connected with the two straight pipes (121) and are parallel to each other, the straight pipes (121) extend out of the discharge end plate (6) and are communicated with the steam distribution chamber (4), and the steam distribution chamber (4) is connected with the rotary joint (2);

the method is characterized in that: the discharging end plate (6) is arranged in the cylinder body (15) and is positioned between the end part of the discharging end of the cylinder body (15) and the discharging opening (152), the shell (151) is connected with the discharging end plate (6) and extends towards the discharging end, and the extending shell (151) is connected with the side wall (802) of the discharging cavity (803) through the discharging sealing device (7);

a heat insulation chamber (801) is arranged outside a side wall (802) of the discharging chamber (803), and the discharging chamber (803) and the heat insulation chamber (801) are divided into two chambers which are isolated from each other by the side wall (802);

the steam distribution chamber (4) is arranged in the heat insulation chamber (801), and the rotary joint (2) is arranged outside the heat insulation chamber (801);

an overflow weir (10) is arranged in the cylinder body (15) and on one side of the discharge port (152) close to the feeding end and adjacent to the discharge port (152), the overflow weir (10) comprises a plurality of independent sector plates (101), the sector plates (101) are fixed on the inner wall of a shell (151) of the cylinder body (15), an adjusting plate (102) is arranged between every two adjacent sector plates (101), and the adjusting plate (102) is fixedly connected with a rotating shaft (103);

the adjusting plate (102) is provided with a plurality of semi-long-strip hole-shaped grooves, each semi-long-strip hole-shaped groove comprises a semi-circular arc and two straight line sections, the semi-circular arc is positioned close to the center of the adjusting plate (102), the two straight line sections extend from two ends of the semi-circular arc to the edge of the adjusting plate (102), an opening is formed in the edge of the adjusting plate (102), and a straight pipe (121) of the heating unit (12) is arranged in the groove and is in clearance fit with the groove;

the rotating shaft (103) rotatably penetrates through a shell (151) of the barrel (15) and extends, a packing sealing device (104) is arranged between the outer wall of the shell (151) and the rotating shaft (103), the packing sealing device (104) is connected with a bearing supporting structure (105), packing is filled between the packing sealing device (104) and the bearing supporting structure (105), and the bearing supporting structure (105) is fixed to the outer wall of the shell (151) through a stud;

a short shaft (107) is fixedly connected to the position, close to the rotating axis of the barrel body (15), of the adjusting plate (102), the short shaft (107) is inserted into a bearing seat cavity (108), and the bearing seat cavity (108) is fixedly connected to the sector plate (101) through a supporting plate (106).

2. A steam rotary dryer according to claim 1, wherein:

the heat insulation chamber (801) is kept in a positive pressure state.

3. A steam rotary dryer according to claim 1 wherein:

two straight pipes (121) of any one heating unit (12) are respectively connected to the steam distribution chamber (4) through a metal hose group (5), one end of the metal hose group (5) connected with the straight pipes (121) is a flexible element, and the other end of the metal hose group is a rigid element;

a valve (51) and/or a pressure gauge (52) are/is arranged on the rigid element on the metal hose group (5) corresponding to any one or more heating units (12).

4. A steam rotary dryer according to claim 2, wherein:

5. A steam rotary dryer according to any one of claims 1 to 4, wherein:

the arc-shaped pipe (122) of the heating unit (12) is arranged in the cylinder (15) along the circumferential direction by taking the rotating axis of the cylinder (15) as the center of a circle;

the central tube pitch of the adjacent arc-shaped tubes (122) of each heating unit (12) in the feeding end area of the cylinder body (15) is larger than that of the adjacent arc-shaped tubes (122) in the discharging end area of the cylinder body (15).

6. A steam rotary dryer according to any one of claims 1 to 4 wherein:

the heating unit (12) divides the cross section of the cylinder into two or more areas, the number of the divided areas is N, then the feeding end plate (17) is divided into N independent units, and each independent unit of the feeding end plate (17) is detachably connected with a flange at the feeding end of the cylinder (15).

7. A steam rotary dryer according to claim 5, wherein: