Drying device of magnesium oxide powder for filling BTTZ fireproof cable

Abstract

The utility model discloses a drying device of magnesium oxide powder for filling a BTTZ fireproof cable, which comprises a drying cylinder, a plurality of groups of funnel-shaped drying trays are arranged in the drying cylinder, and electric heating tubes are arranged in the drying trays; the cover plate is arranged at the upper end of the drying cylinder, and a feeding hopper is arranged on the cover plate; the main shaft is arranged on the central axis of the drying cylinder; a plurality of groups of material distributing plates are arranged on the main shaft; the gear motor is in transmission connection with the main shaft; the discharging opening is formed in the lower end of the drying cylinder; the supporting legs are arranged at the lower end of the drying cylinder; the first ventilation openings are formed in the periphery of the drying cylinder, a plurality of groups of first ventilation openings are formed, and each group comprises a plurality of first ventilation openings; the first ventilation openings are communicated with the interior of the drying cylinder, and except the group of first ventilation openings at the uppermost end, internal communication openings of the rest groups of first ventilation openings are located below the fixed connecting ends of the corresponding drying discs respectively. By means of the design, magnesium oxide powder makes contact with the drying disc more sufficiently, the contact time is longer, drying is more uniform, and the drying effect is better.

Description

Technical Field

[0001] The utility model relates to the field of fireproof cable production, in particular to a drying device for magnesium oxide powder used for filling BTTZ fireproof cables. Background Art

[0002] Magnesium oxide powder is widely used due to its excellent fire resistance and insulation properties. BTTZ fire-resistant cables are filled with a large amount of magnesium oxide powder.

[0003] When filling magnesium oxide powder, BTTZ fireproof cable needs to be dried first to prevent the subsequent use of magnesium oxide powder from being affected by moisture during storage or transportation. At present, multiple electric heating elements are generally installed in the magnesium oxide powder feed hopper to heat and dry the magnesium oxide powder. In this way, the electric heating elements do not contact fully with the magnesium oxide powder, and the drying is uneven, resulting in unsatisfactory drying effect and low drying efficiency. Utility Model Content

[0004] The utility model aims to provide a drying device for magnesium oxide powder for filling BTTZ fireproof cables, which has the advantages of uniform drying, better drying effect and higher drying efficiency.

[0005] The purpose of the utility model is achieved as follows: a drying device for magnesium oxide powder for filling BTTZ fireproof cables, comprising a drying cylinder, wherein a plurality of funnel-shaped drying plates are arranged in the drying cylinder, wherein an electric heating tube is arranged in the drying plate; a cover plate, wherein the cover plate is arranged at the upper end of the drying cylinder, and a feed hopper is arranged on the cover plate; a main shaft, wherein the main shaft is located in the drying cylinder and is arranged on the central axis of the drying cylinder; a plurality of groups of distribution plates are arranged on the main shaft, and the lower end surface of the distribution plate is provided with a plurality of stirring rake teeth for stirring the magnesium oxide powder on the distribution plate; a reduction motor, wherein the reduction motor ... It is arranged on the upper end of the cover plate and is connected to the main shaft transmission; the discharge port is arranged at the lower end of the drying cylinder; a spiral blade installed at the lower end of the main shaft is arranged in the discharge port; a leg, there are a plurality of legs, which are respectively and centrally symmetrically arranged at the lower end of the drying cylinder; a first air vent, the first air vent is arranged at the periphery of the drying cylinder, there are a plurality of groups, each group has a plurality of legs, and they are centrally symmetrically distributed; the first air vent is communicated with the inside of the drying cylinder, and except for the first air vent of the uppermost group, the internal connecting ports of the remaining groups of the first air vent are respectively located below the fixed connection ends of the corresponding drying plates.

[0006] Compared with the prior art, the beneficial effects of the utility model are as follows: in the drying device provided by the utility model, when the magnesium oxide powder flows in the drying cylinder, it is fully stirred by the stirring rake teeth, and is heated and dried by the drying plate for multiple times, so that the water vapor in it is easier to evaporate, so that the drying is more uniform and the drying effect is better; at the same time, a ventilation mechanism is added to speed up the circulation of air in the drying cylinder, and the water vapor evaporated from the magnesium oxide powder can be discharged more quickly, and the air drying and drying are combined, so that the drying efficiency is faster and the effect is better.

[0007] As a preferred solution of the utility model, each of the first air vents is provided with a switch valve; the drying device also includes a ventilation mechanism for accelerating the air circulation in the drying cylinder, the ventilation mechanism includes a second air vent, and the second air vent is arranged on the cover plate; an annular connecting pipe, there are several annular connecting pipes, each of the annular connecting pipes is respectively connected to several first air vents in the same group; a main connecting pipe, the main connecting pipe is connected to several annular connecting pipes; an exhaust fan, the air inlet end of the exhaust fan is connected to one end of the main connecting pipe. This design can accelerate the drying efficiency and has a simple structure.

[0008] Furthermore, the drying cylinder comprises two symmetrical cylinders cut along the central axis of the drying cylinder; the butt joints of the cylinders are provided with butt flanges. This design facilitates the rapid assembly of the drying device and improves the production efficiency of the drying device. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the internal structure of the drying cylinder of the utility model.

[0010] Figure 2 It is a schematic diagram of the side structure of the utility model.

[0011] Among them, 1 drying cylinder, 1a drying plate, 1b electric heating tube, 1c cylinder body, 1d butt flange, 2 cover plate, 2a feed hopper, 3 main shaft, 3a distribution plate, 3b stirring rake, 4 reduction motor, 5 discharge port, 6 spiral blades, 7 legs, 8 first air vent, 8a switch valve, 9 second air vent, 10 annular connecting pipe, 11 main connecting pipe, 12 exhaust fan. DETAILED DESCRIPTION

[0012] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.

[0013] Combined with Figures 1 to 2As shown, a drying device for magnesium oxide powder for filling BTTZ fireproof cables comprises a drying cylinder 1, wherein the drying cylinder 1 is provided with a plurality of funnel-shaped drying discs 1a, wherein the drying discs 1a are provided with electric heating tubes 1b; a cover plate 2, wherein the cover plate 2 is arranged at the upper end of the drying cylinder 1, and a feed hopper 2a is arranged thereon; a main shaft 3, wherein the main shaft 3 is located in the drying cylinder 1 and is arranged on the central axis of the drying cylinder 1; the main shaft 3 is provided with a plurality of distribution discs 3a whose positions correspond to the drying discs 1a, and the lower end surface of the distribution discs 3a is provided with a plurality of stirring rake teeth 3b for stirring the magnesium oxide powder on the distribution discs 3a; a reduction motor 4, wherein the reduction motor 4 is provided with At the upper end of the cover plate 2, and in driving connection with the main shaft 3; a discharge port 5, which is arranged at the lower end of the drying cylinder 1; a spiral blade 6 installed at the lower end of the main shaft 3 is arranged in the discharge port 5; a support leg 7, which has a plurality of support legs 7, which are respectively and centrally symmetrically arranged at the lower end of the drying cylinder 1; a first air vent 8, which is arranged at the outer periphery of the drying cylinder 1, and has a plurality of groups, each group has a plurality of air vents, and is centrally symmetrically distributed; the first air vent 8 is communicated with the interior of the drying cylinder 1, and except for the uppermost group of the first air vent 8, the internal communication ports of the remaining groups of the first air vent 8 are respectively located below the fixed connection ends of the corresponding drying plates 1a.

[0014] Each of the first air vents 8 is provided with a switch valve 8a; the drying device further comprises a ventilation mechanism for accelerating the air circulation in the drying cylinder 1, the ventilation mechanism comprises a second air vent 9, and the second air vent 9 is provided on the cover plate 2; an annular connecting pipe 10, there are a plurality of the annular connecting pipes 10, each of the annular connecting pipes 10 is respectively connected to a plurality of first air vents 8 in the same group; a main connecting pipe 11, the main connecting pipe 11 is connected to a plurality of the annular connecting pipes 10; an exhaust fan 12, the air inlet end of the exhaust fan 12 is connected to one end of the main connecting pipe 11;

[0015] It should be noted that when the ventilation mechanism is working, the switch valve 8a of each first air port 8 is closed, the second air port 9 is opened, and air enters the drying cylinder 1 from the feed hopper 2a and the second air port 9; then the water vapor carrying the evaporated magnesium oxide powder enters the corresponding annular connecting pipe 10 from each first air port 8; finally, it flows into the exhaust fan 12 through the main connecting pipe 11, and is then discharged.

[0016] The drying cylinder 1 comprises two symmetrical cylinder bodies 1c cut along the central axis of the drying cylinder 1; a butt flange 1d is provided at the butt joint of the cylinder bodies 1c;

[0017] It should be noted that the drying plate 1a in the drying cylinder 1 also needs to be divided into two halves; a plurality of connecting holes are provided on the butt flange 1d, and the butt mounting of the cylinder 1c is achieved by combining nuts, bolts and the connecting holes; considering the sealing performance of the drying cylinder 1, a sealing gasket can be added to the butt surface of the cylinder 1c;

[0018] It should also be noted that when assembling the drying device, it is necessary to first complete the installation of the drying plates 1a in the two cylinders 1c, as well as the installation of the main shaft 3, the end cover 2, and the reduction motor 4; then, place the main shaft 3 into any cylinder 1c accordingly, and complete the connection and cooperation between the cylinder 1c and the cover plate 2; then, assemble the two cylinders 1c together, and complete the cooperation with the cover plate 2; finally, install the remaining parts such as the feed hopper 2a, the annular connecting pipe 10, the main connecting pipe 11, and the exhaust fan 12.

[0019] When the drying device is working at normal speed, that is, when the drying temperature of the drying plate 1 is low,

[0020] The reduction motor 4 works to drive the main shaft 3 to rotate, the ventilation mechanism does not work, the switch valve 8a of each first air vent 8 is opened, and the heating power of the electric heating tube 1b in the drying plate 1a is low;

[0021] The magnesium oxide powder enters the drying cylinder 1 from the feed hopper 2a, and falls onto the corresponding drying plate 1a under the action of the first distribution plate 3a. After being heated and dried by the drying plate 1a, it falls onto the next distribution plate 3a with the assistance of the stirring rake teeth 3b, and then falls onto the corresponding drying plate 1a, and this is repeated until it enters the discharge port 5. During this period, the water vapor evaporated from the magnesium oxide powder enters each first air vent 8 and is discharged through the switch valve 8a.

[0022] After the magnesium oxide powder enters the discharge port 5, it is continuously discharged under the action of the spiral blades 6.

[0023] When the drying device operates at high speed, that is, when the drying temperature of the drying plate 1a is high, the drying process of the magnesium oxide powder is basically the same as when it operates at normal speed. The difference is that at this time, the ventilation mechanism is opened, the switch valve 8a of each first air vent 8 is closed, and the heating power of the electric heating tube 1b in the drying plate 1a is higher.

[0024] The present utility model is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present utility model, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present utility model.

Claims

1. A drying device for magnesium oxide powder for filling BTTZ fireproof cables, Features: The drying device comprises A drying cylinder (1), wherein a plurality of groups of funnel-shaped drying plates (1a) are arranged in the drying cylinder (1), and an electric heating tube (1b) is arranged in the drying plate (1a); A cover plate (2), the cover plate (2) being arranged at the upper end of the drying cylinder (1) and having a feed hopper (2a) arranged thereon; A main shaft (3), the main shaft (3) being located in the drying cylinder (1) and arranged on the central axis of the drying cylinder (1); the main shaft (3) being provided with a plurality of groups of distribution plates (3a) whose positions correspond to the drying plates (1a); the lower end surface of the distribution plates (3a) being provided with a plurality of stirring rake teeth (3b) for stirring the magnesium oxide powder on the distribution plates (3a); A reduction motor (4), wherein the reduction motor (4) is arranged at the upper end of the cover plate (2) and is drivingly connected to the main shaft (3); A discharge port (5), the discharge port (5) being arranged at the lower end of the drying cylinder (1); a spiral blade (6) mounted on the lower end of the main shaft (3) is arranged in the discharge port (5); Support legs (7), the support legs (7) are in plurality and are respectively and symmetrically arranged at the lower end of the drying cylinder (1); First air vents (8), the first air vents (8) are arranged on the periphery of the drying cylinder (1), and there are several groups of the first air vents (8), each group having several air vents and being symmetrically distributed around the center; the first air vents (8) are connected to the interior of the drying cylinder (1), and except for the group of first air vents (8) at the top, the internal communication openings of the remaining groups of first air vents (8) are respectively located below the fixed connection ends of the corresponding drying plates (1a).

2. A drying device for magnesium oxide powder for filling BTTZ fireproof cable according to claim 1, Features: Each of the first air vents (8) is provided with a switch valve (8a); the drying device also includes a ventilation mechanism for accelerating the air circulation in the drying cylinder (1), the ventilation mechanism including A second air vent (9), wherein the second air vent (9) is arranged on the cover plate (2); An annular connecting pipe (10), wherein there are a plurality of the annular connecting pipes (10), and each of the annular connecting pipes (10) is respectively connected to a plurality of first air permeable ports (8) in the same group; A main connecting pipe (11), wherein the main connecting pipe (11) is connected to a plurality of annular connecting pipes (10); An exhaust fan (12), wherein an air inlet end of the exhaust fan (12) is connected to one end of the main connecting pipe (11).

3. A drying device for magnesium oxide powder for filling BTTZ fireproof cable according to claim 1 or 2, Features: The drying cylinder (1) comprises two mutually symmetrical cylinder bodies (1c) formed by sectioning along the central axis of the drying cylinder (1); a butt flange (1d) is provided at the butt joint of the cylinder bodies (1c).

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