CN112706278A

CN112706278A - Large-scale mica pipe production facility

Info

Publication number: CN112706278A
Application number: CN202011552985.0A
Authority: CN
Inventors: 雷涛; 田凤霞; 刘皓; 陈小玲; 王电化
Original assignee: Hubei University of Science and Technology
Current assignee: Hubei University of Science and Technology
Priority date: 2020-12-24
Filing date: 2020-12-24
Publication date: 2021-04-27

Abstract

The invention provides large-scale mica tube production equipment, and belongs to the technical field of insulating material preparation. Including frame, driving motor, hot plate and a pipe die, the pipe die includes die and lower die, goes up and can dismantle the connection through a plurality of connecting pieces between die and the lower die, goes up and forms a die cavity between die and the lower die, and the pipe die is located on the hot plate, has seted up the gas pocket coaxial with the die cavity on the lower die, and the both ends of lower die link to each other with the frame through the bearing respectively, and driving motor can drive the lower die rotation. The invention has the advantages of better insulating property of the prepared mica tube and the like.

Description

Large-scale mica pipe production facility

Technical Field

The invention belongs to the technical field of insulating material preparation, and relates to large-scale mica tube production equipment.

Background

Mica is a common rock-making ore, and can be produced into parts with various shapes through crushing, bonding and reprocessing. Mica is low-energy-level ore and has high fire resistance and insulation, so the mica has a plurality of applications in the field of insulation and fire resistance, and in common mica materials, plates, block-shaped blanks, round rods and round tubes are common blanks, and various parts can be manufactured by cutting.

The general pipe material blank is manufactured by mixing mica powder and a binder through a pipe die made of metal, and pressing the mixture by a press and a heater, but the maximum diameter of the mica pipe which can be manufactured by the existing process is smaller, the length of the mica pipe is relatively shorter, and most importantly, the insulation performance of the mica pipe is poorer because: mica is because its physical structure is the slice, when using as insulating material, the direction of its scale plays the key role to insulating size, and when the scale was on a parallel with the electric field direction, it is poor to insulate, when the scale was perpendicular to electric field direction, it was effectual to insulate, and current way, mica scale are in disorder to be distributed in the binder, lead to its insulated wire relatively poor.

Disclosure of Invention

The invention aims to provide large-scale mica tube production equipment aiming at the problems in the prior art, and the technical problem to be solved by the invention is how to prepare a mica tube with better insulating property.

The purpose of the invention can be realized by the following technical scheme: the utility model provides a large-scale mica pipe production facility, a serial communication port, including frame, driving motor, hot plate and a pipe die, the pipe die includes die and lower die, go up and to dismantle the connection through a plurality of connecting pieces between die and the lower die, it forms a die cavity to go up between die and the lower die, the pipe die is located on the hot plate, set up the gas pocket coaxial with the die cavity on the lower die, the both ends of die link to each other with the frame through the bearing respectively down, driving motor can drive the die is rotatory down.

The preparation method comprises the following steps: according to the wall thickness requirement of the required mica tube, a proper amount of mixture of mica powder and a bonding agent is injected into the concave cavity of the lower die sheet;

fixing the upper die sheet on the lower die sheet;

starting a driving motor to enable the pipe die to rotate at a constant speed, and then starting the heating plate;

and (3) after the mixture in the mold cavity is formed and solidified, closing the driving motor and the heating plate, and opening the mold to obtain the mica tube positioned in the mold cavity.

The upper die piece and the lower die piece are respectively provided with an upper cavity and a lower cavity, the air holes are semicircular so as to facilitate volatilization of a diluent of a binder, flat plate flanges are respectively welded on the upper die piece and the lower die piece at the division position of the upper cavity and the lower cavity, slotted holes are formed in the flanges so as to facilitate bolt tightening, the upper die piece and the lower die piece can be fastened at a locking groove through bolt nuts, the die cavity is a cylindrical cavity space, and the size of the cylindrical cavity space and the size of the mica pipe are determined.

Two concentric complete circular shafts are welded at two ends of the lower cavity, and the shaft cores of the two concentric complete circular shafts are provided with small holes which are communicated with the air holes. And bearings are respectively sleeved on each circular shaft at the two ends. The heating plate is arranged below the lower cavity and between the two bearing seats, the bearings are respectively supported by the respective bearing seats, the bearing seats are U-shaped, the upper cavity and the lower cavity can be removed from the upper part after being sleeved with the bearings, filling is convenient to carry, the bearing seats have enough height, and when the upper cavity and the lower cavity are combined, the cylinder and the flange which are combined by the upper cavity and the lower cavity can be ensured to have enough space to rotate without touching the heating plate below.

The end of one of the round shafts of the lower die plate is provided with a driven wheel, the driven wheel is connected to a driving wheel through a belt, and the driving wheel is sleeved on an output shaft of a variable-frequency driving motor.

The mica powder and the binder in the cavity form a cylinder under the action of centrifugal force and are attached to the cavity wall to form a circular tube. The bottom heating plate is properly and timely opened at a proper temperature, so that the temperature is increased, the volatilization of a diluent in the binder is ensured, and the solidification speed is accelerated.

The outer wall of the lower cavity of the upper cavity can be watered by cold water, and the mold opening is convenient by utilizing the characteristics of different thermal expansion and cold shrinkage rates.

The proportion of the mica powder and the binder is determined according to experience, and the excessive mica powder can cause the middle part of the middle mica tube not to be solidified and the slag to fall off; the excessive proportion of the binder can cause the mica tube to be layered, namely the binder is cured close to the middle part of the mica tube, but the mica powder is not in the mica tube.

Compared with the prior art, the scheme has the following advantages: large pipes can be manufactured: the traditional pressing process can only manufacture a pipe with the diameter of less than 200 and the length of less than two meters, and in the method, the distribution of the scales in the mixture is more regular through centrifugal force, so that the diameter can be expanded to 500mm, the length can reach more than 10 meters, and the pipe still has good insulating property.

An oil pressure press is not needed, a centrifugal force mode adopted by rotation is adopted to serve as pressure, and the investment on equipment is reduced.

The distribution state of the mica flakes is more reasonable: mica is flaky because of its physical structure, and when using as insulating material, the direction of its scale plays the key role to insulating size, and when the scale is on a parallel with the electric field direction, it is poor to insulate, and when the scale is perpendicular to the electric field direction, it is effectual to insulate. The mica tube manufactured by the centrifugal method has the advantages that the direction of the mica scales is completely parallel to the tangent line of the mica tube under the action of centrifugal force, so that when the center of the mica tube passes through high voltage electricity, the direction of an electric field is completely vertical to the mica scales, and the insulation effect of the mica tube with the same volume is maximum.

Drawings

FIG. 1 is a schematic perspective view of the mica tube production equipment.

FIG. 2 is a schematic diagram of the distribution of the scales in the mica tube prepared by the conventional method.

FIG. 3 is a schematic diagram of the distribution of the scales in the mica tube prepared by the method.

In the figure, 1, a frame; 2. a drive motor; 3. heating plates; 4. mounting a die sheet; 5. a lower die sheet; 6. and (4) air holes.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1, a mica tube is prepared by a mica tube production device, the mica tube production device comprises a frame 1, a driving motor 2, a heating plate 3 and a tube die, the tube die comprises an upper die sheet 4 and a lower die sheet 5, the upper die sheet 4 and the lower die sheet 5 are detachably connected through a plurality of connecting pieces, a die cavity is formed between the upper die sheet 4 and the lower die sheet 5, the tube die is positioned on the heating plate 3, the lower die sheet 5 is provided with an air hole 6 coaxial with the die cavity, two ends of the lower die sheet 5 are respectively connected with the frame 1 through bearings, and the driving motor 2 can drive the lower die sheet 5 to rotate;

the preparation method comprises the following steps: according to the wall thickness requirement of the required mica tube, a proper amount of mixture of mica powder and a bonding agent is injected into the concave cavity of the lower template 5;

fixing the upper die sheet 4 on the lower die sheet 5;

starting a driving motor 2 to enable the pipe die to rotate at a constant speed, and then starting a heating plate 3;

and (3) after the mixture in the mold cavity is formed and solidified, closing the driving motor 2 and the heating plate 3, and opening the mold to obtain the mica tube positioned in the mold cavity.

The upper die 4 and the lower die 5 are respectively provided with an upper cavity and a lower cavity, the air hole 6 is semicircular so as to facilitate volatilization of a diluent of the adhesive, the upper die 4 and the lower die 5 at the division position of the upper cavity and the lower cavity are respectively welded with a flat flange, slotted holes are formed in the flanges so as to facilitate bolt tightening, the upper die 4 and the lower die 5 can be fastened at the locking groove through a bolt and a nut, the die cavity is a cylindrical cavity space, and the size of the cylindrical cavity space and the size of the mica tube are determined.

Two concentric complete circular shafts are welded at two ends of the lower cavity, and the shaft cores of the two concentric complete circular shafts are provided with small holes which are communicated with the air holes 6. And bearings are respectively sleeved on each circular shaft at the two ends. Below the cavity of resorption, there is hot plate 3 between two bearing frames, and the bearing is supported by respective bearing frame respectively, and the bearing frame is the U-shaped, guarantees that whole upper and lower cavity sheathes in the bearing after, can get rid of from the top, is convenient for adorn the filler, and the bearing frame has sufficient height, and when the cavity of resorption merges, guarantees that cylinder and the flange of cavity of resorption merger have enough space can rotate, and do not touch hot plate 3 below.

A driven wheel is arranged at the end of one of the round shafts of the lower die plate 5 and is connected to a driving wheel through a belt, and the driving wheel is sleeved on an output shaft of a variable-frequency driving motor 2.

The mica powder and the binder in the cavity form a cylinder under the action of centrifugal force and are attached to the cavity wall to form a circular tube. The bottom heating plate 3 is properly and timely opened at a proper temperature, so that the temperature is increased, the volatilization of the diluent in the binder is ensured, and the solidification speed is accelerated.

Compared with the prior art, the scheme has the following advantages: large pipes can be manufactured: the traditional pressing process can only manufacture pipes with the diameter of less than 200 and the length of less than two meters, and the method related by the patent expands the diameter to 500mm and the length of more than 10 meters.

As shown in fig. 2 and 3, the mica flake distribution state of the mica tube prepared by the method is more reasonable: mica is flaky because of its physical structure, and when using as insulating material, the direction of its scale plays the key role to insulating size, and when the scale is on a parallel with the electric field direction, it is poor to insulate, and when the scale is perpendicular to the electric field direction, it is effectual to insulate. The mica tube manufactured by the centrifugal method has the advantages that the direction of the mica scales is completely parallel to the tangent line of the mica tube under the action of centrifugal force, so that when the center of the mica tube passes through high voltage electricity, the direction of an electric field is completely vertical to the mica scales, and the insulation effect of the mica tube with the same volume is maximum.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. The utility model provides a large-scale mica pipe production facility, its characterized in that, includes frame (1), driving motor (2), hot plate (3) and a pipe die, the pipe die includes die (4) and lower die (5), go up and to dismantle the connection through a plurality of connecting pieces between die (4) and lower die (5), it forms a die cavity to go up between die (4) and lower die (5), the pipe die is located on hot plate (3), offer on die (5) down with the coaxial gas pocket (6) of die cavity, the both ends of die (5) link to each other with frame (1) through the bearing respectively down, driving motor (2) can drive down die (5) are rotatory.