JPH0741391U - Rotary drum type dryer - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a rotary drum type drying device having excellent performance, in which a material to be dried does not leak outside the drum to contaminate the periphery of the drum and hinder the rotation of the drum. [Structure] A chute 19 for supplying a material to be dried and a duct 20 for exhausting exhaust gas are integrated into an opening 17 on one end side of a rotary drum 1 by a disk-shaped partition wall 18 having an outer diameter substantially the same as the inner diameter of the opening 17. Mounted on disk, disk-shaped partition wall
A heat-resistant annular seal material 23 is provided between the outer peripheral surface of 18 and the inner peripheral surface of the opening 17.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to, for example, a rotary drum type drying device used for drying sand or the like.

[0002]

[Prior art]

 For example, in a foundry, a rotary drum type dryer is used for drying foundry sand. FIG. 8 is a partial schematic vertical cross-sectional view of a conventional rotary drum type drying device on the side of supplying a material to be dried. As shown in FIG. 8, on one end surface of the rotary drum 1 which is arranged in a horizontal direction with a slight inclination from one end to the other end and which rotates about its axis, a feed port 2 for the material to be dried is provided. Has been formed.

At one end of the rotary drum 1 where the supply port 2 is formed, a hood 3 that covers the supply port 2 and the entire end is fixedly provided, and a contact surface between the outer peripheral surface of the drum 1 and the hood 3 is provided. Is provided with a labyrinth 4 for sealing the both. A gas outlet 5 is provided on the upper surface of the hood 3, and a dust collection duct is connected to the gas outlet 5.

Reference numeral 6 denotes a chute for inclining downwardly for supplying the material to be dried into the rotary drum 1. The chute 6 penetrates the hood 3 and the supply port 2 of the drum 1, It is arranged so that its tip is located in the drum 1. The sand 7 as the material to be dried, which has been supplied into the drum 1 through the chute 6 from the supply port 2, is successively transferred to the other end side of the drum 1 by the screw blades 8 attached to the inner peripheral surface of the drum 1. While being moved, it is dried by high temperature gas heated by a burner (not shown) provided on the other end side of the drum 1, and is discharged from the discharge port of the other end.

[0005]

[Problems to be solved by the device]

 The conventional rotary drum type drying device has the following problems. That is, as described above, the large-diameter supply port 2 into which the chute 6 can be inserted is formed on one end surface of the drum 1, and the dust collecting duct is connected to the upper surface of the hood 3. A gas exhaust port 5 is provided. As a result, when the exhaust gas containing dust generated in the drum 1 is discharged from the gas discharge port 5 of the hood 3, the dust 9 stalls and drops into the hood 3, and also a part of the sand 7 , Fall into the hood 3 along with the dry gas.

In this way, the dust 9 and sand 7 that have fallen and accumulated in the hood 3 leak to the outside of the hood 3 through the gap between the labyrinth 4 that is the contact portion between the drum 1 and the hood 3. As a result, the periphery of the drum 1 becomes dirty and the rotation of the drum 1 is hindered. Furthermore, maintenance of the labyrinth 4 requires a lot of trouble and expense.

Therefore, an object of the present invention is to solve the above-mentioned problems, and to prevent the material to be dried from leaking out of the drum to contaminate the periphery of the drum and hinder the rotation of the drum, and to maintain the labyrinth. It is to provide a rotary drum type drying device that does not require the above.

[0008]

[Means for Solving the Problems]

 The device of the present invention has an opening for supplying and discharging exhaust gas to be dried at one end and an opening for discharging dry material at the other end, and a drying burner is attached to the opening on the other end side, and In a rotary drum type drying apparatus, which comprises a horizontal drum that rotates around its axis in which a chute for supplying the material to be dried is arranged in the one end side opening, the one end side opening of the drum has a circular shape. The chute for supplying the material to be dried and the exhaust gas exhaust duct are integrally attached to the circular opening by a disk-shaped partition having an outer diameter substantially the same as the inner diameter of the circular opening. The outer peripheral surface of the disc-shaped partition wall and the inner peripheral surface of the circular opening are sealed by a heat-resistant annular sealing material.

[0009]

According to the device of the present invention, unlike the conventional device, a foot having a gas discharge port and a chute is not provided at the end of the rotary drum on the supply port side, and a circular opening on the one end side of the drum is provided. A chute and a duct are integrally attached to the box by a disk-shaped partition wall. Therefore, the dust and the material to be dried generated in the drum will not be accumulated in the hood and leak out of the hood to contaminate the periphery of the drum or hinder the rotation of the drum.

[0010]

【Example】

 Next, the device of the present invention will be described with reference to the drawings. 1 is an overall schematic front view showing an embodiment of the device of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a sectional view taken along the line BB of FIG. 1, and FIG. 2 is an enlarged vertical sectional view showing one end side of FIG. As shown in FIGS. 1 to 3, the rotary drum 1, which is horizontally arranged with a slight inclination from one end to the other end, is supported by a roller 10 and can be rotated about its axis by a drive mechanism 11. It has become. An opening 13 for discharging dried matter is formed at the other end of the drum 1, and the other end is entirely covered with a hood 14. The hood 14 is provided with a drying burner 15 and a dried matter discharge port 16. 12 is a screw blade attached to the inner surface of the drum 1.

A circular opening 17 is formed at one end of the rotary drum 1, and a disk-shaped partition wall 18 having an outer diameter substantially the same as the inner diameter of the opening 17 is immovably arranged in the circular opening 17. . A chute 19 for supplying the material to be dried and a duct 20 for discharging the exhaust gas are fixed to the disk-shaped partition wall 18 so as to penetrate therethrough. The chute 19 and the duct 20 to which the disk-shaped partition wall 18 is attached are supported by a stand 22 standing on a base 21, as shown in FIG.

As shown in the cross-sectional view taken along the line CC in FIG. 5, the chute 19 for supplying the material to be dried and the duct 20 for discharging the exhaust gas have a square cross section, and By incorporating a part of the chute 19 into the upper portion of the duct 20 so that the chute 19 is located, both are integrally formed.

As shown in FIG. 4, the bottom surface of the chute 19 is bent and formed at an angle of three steps from the entrance side to the exit side. The angles of the three stages are preferably α: 50 to 70 °, β: 40 to 50 °, and γ: 25 to 40 ° from the entrance side to the exit side. By forming the shoots 19 at such an angle, the material to be dried can be fed deeper into the inside of the drum 1 through the shoes 19 due to its inertia. The sheet 19 may be formed in a smooth curved shape so as to have the above three angles α, β, γ.

As shown in FIG. 4, a circular opening 17 formed at one end of the drum 1 is provided with a heat-resistant annular seal material 23 that comes into contact with the outer peripheral surface of the disk-shaped partition wall 18. The ring-shaped sealing material 23 seals between the outer peripheral surface of the disk-shaped partition wall and the inner peripheral surface of the circular opening.

On the inner surface of the circular opening 17 formed at one end of the drum 1, as shown in the enlarged side view of the one end of the drum in FIG. A blade 24 is provided around the entire circumference of the drum 1 so as to bring the generated dust toward the center of the drum 1 so that the generated dust does not approach the annular seal material 23.

As shown in the vertical sectional view of the one end side of the drum in FIG. 6, the supply chute 19 and the discharge duct 20 are arranged in the upper part of the chute 19 so that the duct 20 is located above the chute 19. A part of the duct 20 may be incorporated to integrally form both. As in the case of FIG. 4, the bottom surface of the chute 19 is bent and formed at three stages from the inlet side to the outlet side.

The device of the present invention is configured as described above, and, like the conventional device, is provided with a hood having a gas discharge port and a chute at the end of the rotary drum on the supply port side. First, the chute 19 and the duct 20 are integrally attached to the circular opening 17 on one end side of the drum 1 by the disk-shaped partition wall 18. Therefore, the dust generated in the drum 1 and a part of the sand 7 as the material to be dried are not accumulated in the hood 3 and leaked out of the hood 3. Since the pressure inside the drum 1 is negative with respect to the outside, dust does not blow out from the annular sealing material 23 portion together with the exhaust gas. As a result, there is no possibility that dust or sand leaked to the outside of the drum 1 will contaminate the periphery thereof or hinder the rotation of the drum 1. In addition, there is no need for labyrinth maintenance as in the past.

Further, since the chute 19 is heated by the high-temperature exhaust gas passing through the duct 20, the wet object to be dried does not adhere to the chute 19 when passing through the chute 19. In this respect, the device shown in FIG. 4 in which the chute 19 is located above the duct 20 is more effective.

In the embodiments described above, the case where sand is dried as the material to be dried has been described. However, the device of the present invention is not limited to the drying of sand, but is of course effective for drying various substances. The same effect can be obtained by applying to various rotary drums such as a baking machine, a crusher, a heating machine and a mixer.

[0020]

[Effect of device]

 As described above, according to the device of the present invention, the material to be dried leaks out of the drum to contaminate the periphery of the drum, the rotation of the drum is not hindered, and the labyrinth maintenance is not required. And the like, industrially useful effects are brought about.

[Brief description of drawings]

FIG. 1 is an overall schematic front view showing an embodiment of the device of the present invention.

FIG. 2 is a sectional view taken along line BB of FIG.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is an enlarged vertical sectional view showing one end side of FIG.

5 is a cross-sectional view taken along line CC of FIG.

FIG. 6 is a vertical sectional view of one end of the drum showing another embodiment of the device of the present invention.

FIG. 7 is an enlarged side view of one end of the drum.

FIG. 8 is a partial schematic vertical cross-sectional view of a material to be dried supply side in a conventional device.

[Explanation of symbols]

 1 rotary drum, 2 supply port, 3 hood, 4 labyrinth, 5 gas discharge port, 6 chute, 7 sand, 8 screw blade, 9 dust, 10 roller, 11 drive mechanism, 12 screw blade, 13 opening, 14 hood, 15 Burner, 16 dry matter discharge port, 17 circular opening, 18 disk partition, 19 chute, 20 duct, 21 base, 22 stand, 23 annular sealing material, 24 blades.

Claims (2)

[Scope of utility model registration request] 1. A dry burner is attached to the opening on the other end side, and an opening for supplying the dried material and discharging exhaust gas is provided at one end, and an opening for discharging the dry matter is provided at the other end. In a rotary drum type drying device comprising a horizontal drum that rotates around its axis, in which a chute for supplying the material to be dried is arranged at the one end side opening, the one end side opening of the drum is circular. The circular opening has a chute for supplying a material to be dried and an exhaust gas exhaust duct integrally attached by a disk-shaped partition wall having an outer diameter substantially the same as the inner diameter of the circular opening, A rotary drum type drying device, wherein an outer peripheral surface of the disk-shaped partition wall and an inner peripheral surface of the circular opening are sealed by a heat-resistant annular seal material. 2. A central portion of the drum so that an object to be dried supplied into the drum and dust generated in the drum do not come into contact with the sealing material on an inner surface of the circular opening formed at one end of the drum. The apparatus of claim 1, wherein the orienting vanes are mounted around the entire perimeter thereof.