CN111703005A

CN111703005A - Foaming preheating device for strip-shaped high polymer material

Info

Publication number: CN111703005A
Application number: CN202010439548.1A
Authority: CN
Inventors: 杨庆锋; 张镤
Original assignee: Zhejiang Runyang New Materials Technology Co ltd
Current assignee: Zhejiang Runyang New Materials Technology Co ltd
Priority date: 2020-05-22
Filing date: 2020-05-22
Publication date: 2020-09-25

Abstract

The invention belongs to the technical field of foaming material production equipment, and particularly discloses a foaming preheating device for a strip-shaped high polymer material, which comprises a heating box body and a conveying mechanism, wherein the conveying mechanism comprises a circularly conveyed closed-loop conveying belt which is arranged in the heating box body and one end of which extends to the outside of an inlet end of the heating box body, and a first roller and a second roller which are wound at two ends of the conveying belt; the conveying belt is made of flexible high polymer materials and comprises a holding area and power areas arranged on two sides of the holding area. The flexible high polymer material is selected as a material of the conveying belt, the placing area of the conveying belt is used for placing the strip-shaped high polymer material, the power area is matched with the roller to realize transmission, the screw is used as a tensioning mechanism, the structure of gear chain transmission, iron net transmission and cylinder tensioning in the prior art is effectively replaced, and the flexible high polymer material conveying belt has the advantages of stable operation, difficult damage, long service life, good preheating effect, low cost, high efficiency and the like.

Description

Foaming preheating device for strip-shaped high polymer material

Technical Field

The invention belongs to the technical field of foaming material production equipment, and particularly relates to a foaming preheating device for a strip-shaped high polymer material.

Background

The foaming of the sheet is a process in which a molded tape-shaped polymer material is heated in a foaming furnace, and a foaming agent is decomposed at a high temperature to generate gas, and the gas is filled in the polymer material to generate a foamed material having closed pores. The foaming effect is not good when directly foaming the sheet, not only consuming time for a long time, the foaming is inhomogeneous very easily appears moreover, intensity hardness is not up to standard scheduling problem, consequently can preheat the sheet before foaming in actual production to improve above-mentioned problem.

The existing foaming preheating equipment generally comprises a conveying mechanism and a heating box body, wherein the conveying mechanism usually takes an iron net as a conveying belt, a layer of thin iron sheet is laid on the surface of the iron net, chains meshed with gears are fixedly connected to two sides of the iron net, and the gears are tensioned and adjusted by arranging cylinders; when the sheet preheating device is used, sheets are placed on the thin iron sheets, the iron net is driven to advance through the matching of the chains and the gears, and the sheets are conveyed to the heating box body to be preheated. The preheating device has the following defects: firstly, the iron net is easy to rust and accumulate oil stain, needs to be cleaned frequently and has short service life; the heat conduction efficiency of iron is high, even if a thin iron sheet is arranged, the problem that the sheet is unevenly heated and even the surface of the sheet is marked due to the existence of an iron net can cause the phenomenon of uneven subsequent foaming and even breakage; furthermore, the sheet may also cause problems with adhesion to thin iron sheets; secondly, through chain gear transmission, the phenomenon of tooth clamping and even tooth breaking can occur after the machine runs for a period of time, so that the machine stops swinging and needs frequent maintenance, and the production efficiency can be obviously reduced for assembly line production; due to the fact that frequent maintenance and cleaning are needed, the air cylinder is selected as the tensioning mechanism, the iron net can be conveniently detached, but the air cylinder is easy to adjust and unstable in pressure, so that the gears on the two sides are unbalanced in stress, the air cylinder is prone to rebounding, and a chain is prone to breaking; the air cylinder needs a certain time for adjustment, and when the pressure of the air cylinder is insufficient, the phenomena of tooth breakage or tooth jumping are easy to occur; fourthly, the maintenance and the cleaning are needed frequently, the service life is short, and therefore, the cost is high.

Disclosure of Invention

In order to solve the problems, the invention provides a foaming preheating device for a strip-shaped high polymer material, which is stable in operation, not easy to damage and long in service life; the preheating effect is good; low cost and high efficiency.

In order to achieve the purpose, the invention adopts the following specific technical scheme:

a foaming preheating device for a strip-shaped high polymer material comprises a heating box body and a conveying mechanism for conveying the strip-shaped high polymer material to the heating box body, wherein the conveying mechanism comprises a circular conveying closed-loop conveying belt which is arranged in the heating box body and one end of the conveying closed-loop conveying belt extends to the outside of an inlet end of the heating box body, and a first roller and a second roller which are wound at two ends of the conveying belt, the first roller is arranged outside the heating box body, and at least one of the first roller and the second roller is an active roller driven to rotate by power equipment; the conveying belt is made of a high polymer flexible material and comprises a shelving area for placing a strip-shaped high polymer material and power areas which are arranged on two sides of the shelving area and drive the shelving area to advance.

Preferably, the laydown area is of a grid-like structure.

Preferably, the flexible polymer material is polytetrafluoroethylene.

Preferably, the positions of the first roller close to the two end parts are respectively provided with a clamping groove, and the lower surface of the power area is provided with a driving strip attached to the clamping grooves.

Preferably, both ends of the first roller are provided with screws for tensioning the power area.

Preferably, the first roller is installed in the heating box body through a shaft sleeve, one end of the screw is abutted to the shaft sleeve, and the other end of the screw is fixed in the heating box body in a rotatable and adjustable manner.

Preferably, the heating box body comprises three preheating zones, and a heat insulation plate is arranged between every two adjacent preheating zones; the top wall of the preheating zone is provided with heating elements, and the temperature control systems of the heating elements of different preheating zones are mutually independent.

Preferably, the heating box body is arranged obliquely upwards from the outlet end to the outlet end.

Preferably, the outer surface of the heating box body is provided with a controller, the controller 6 is provided with a switch, and the switch is used for controlling the heating element and the conveying mechanism.

The invention has the following beneficial effects:

1. the conveying belt is made of flexible high polymer materials (preferably polytetrafluoroethylene), and is divided into a resting area and a power area; wherein shelve the structure that two-layer structure is iron net + thin iron sheet among the replacement prior art in the district, can effectively avoid the various defects of traditional two-layer structure: the flexible high polymer material has the characteristics of smooth surface, high temperature resistance (at least 120 ℃) and difficult oil stain accumulation, so that the flexible high polymer material does not need to be cleaned frequently, has long service life, can ensure that the sheet is heated uniformly and is difficult to deform and adhere to the sheet; the power area and the roller are matched to replace a chain transmission mode in the prior art, so that the arrangement of a gear and a chain is omitted, the problems of tooth clamping and tooth breakage caused by chain transmission are avoided, the transmission is more stable, the fault is not easy to occur, the stable period of the flow line production is obviously improved, and the production efficiency is further improved.

2. The shelf area is set to be of a grid structure, so that the possibility of bonding the shelf area and the sheet is further reduced, the shelf area is more breathable, the preheating of the sheet is accelerated through up-and-down heat transfer, the temperature difference inside and outside the sheet is reduced, and the preheating effect is improved.

3. The driving strips are arranged on the lower surface of the power area and matched with the clamping grooves arranged on the rollers, so that a good deviation rectifying and positioning effect is achieved, and the problems of deviation and steering of the conveying belt are avoided; the friction between the power area and the roller is increased due to the arrangement of the driving strips, and the problem that the conveying belt slips is solved.

4. The screw rod is used as a tensioning mechanism of the power area to replace an air cylinder in the prior art, so that the problems of air cylinder resilience, conveying belt deviation and the like caused by easy generation of an air cylinder adjusting process are solved, and meanwhile, the precision of tensioning adjustment is increased. The material selection of the conveying belt is combined with the design of the transmission structure, so that frequent cleaning and maintenance are not needed, the air cylinder with poor adjustment precision is not needed to be detached conveniently, and the tension adjustment is carried out by adopting the screw rod, so that the transmission stability is further improved.

5. Compared with the integrated structure of the iron net and the chain in the prior art, the conveying belt has the advantages that the cost is about 1/4, and the service life is 3-4 times that of the conveying belt.

Drawings

FIG. 1: schematic structural diagram of example 1.

FIG. 2: the perspective structure of fig. 1 is schematically shown at a.

FIG. 3: the structure of embodiment 2 is schematically shown.

In the figure: 1-a heating box body, 2-a conveyer belt, 3-a first roller, 4-a second roller, 5-a screw and 6-a controller; 11-a heat insulation board, 12-a first preheating zone, 13-a second preheating zone, 14-a third preheating zone, 15-a heating element, 16-an air outlet, 17-a connecting part, 21-a resting zone, 22-a power zone, 31-a clamping groove, 32-a shaft sleeve and 51-a nut; 171-a mounting frame.

Detailed Description

The invention is further described below with reference to the accompanying drawings and specific embodiments.

Example 1

A foaming preheating device for a strip-shaped high polymer material is shown in figures 1-2 and comprises a heating box body 1 and a conveying mechanism for conveying the strip-shaped high polymer material to the heating box body 1;

the conveying mechanism comprises a circular conveying closed-loop conveying belt 2 which is arranged in the heating box body 1 and one end of which extends to the outside of the inlet end of the heating box body 1, and a first roller 3 and a second roller 4 which are wound at two ends of the conveying belt 2, wherein the first roller 3 is positioned at the outer side of the inlet end of the heating box body 1, the second roller 4 is positioned at the outer side of the outlet end of the heating box body 1, and at least one of the first roller 3 and the second roller 4 is an active roller driven by power equipment to rotate (in the embodiment, the second roller 4 is an active roller and is driven to rotate by a motor); the conveying belt 2 is made of a flexible high polymer material, and comprises a shelving area 21 with a grid-shaped structure and power areas 22 which are arranged on two sides of the shelving area 21 and fixedly connected with the shelving area 21, wherein the flexible high polymer material is polytetrafluoroethylene; clamping grooves 31 are respectively formed in positions, close to two end parts, of the first roller 3, driving strips attached to the clamping grooves 31 are arranged on the lower surface of the power area 22, the driving strips are located on one side of the clamping grooves 31, and the driving strips are limited by the clamping grooves 31 to prevent the conveying belt 2 from deviating;

two ends of the first roller 3 are provided with a screw rod 5 used for tensioning the power area 22; the two ends of the central shaft of the first roller 3 are sleeved with shaft sleeves 32, and the first roller 3 is arranged on the vertically arranged connecting parts 17 extending from the two sides of the inlet of the heating box body 1 through the shaft sleeves 32; one end of the screw 5 abuts against the shaft sleeve 32, and the other end of the screw is fixed to the connecting part 17 of the heating box body 1 through a mounting frame 171; the screw 5 passes through the mounting bracket 171 and is locked to the mounting bracket 171 by two nuts 51 at both sides of the mounting bracket 171;

the heating box body 1 comprises a first preheating zone 12, a second preheating zone 13 and a third preheating zone 14, wherein a heating element 15 is arranged on the top wall of each preheating zone, and temperature control systems of the heating elements 15 of different preheating zones are mutually independent (the heating elements 15 are a plurality of electric heating tubes arranged in parallel in the embodiment) so as to perform gradual temperature control; a heat insulation plate 11 is arranged between the adjacent preheating zones to reduce the temperature influence of the adjacent preheating zones and ensure that the temperature distribution of each preheating zone is more uniform; the whole foaming preheating device is obliquely and upwards arranged from the inlet end to the tail end of the heating box body 1, so that polluted waste gas generated in the preheating process can flow from the inlet end to the outlet end of the heating box body 1 and then is discharged, and environmental pollution and potential safety hazards caused by the fact that the waste gas runs out of the inlet end of the heating box body 1 are avoided; the outer surface of the heating box body 1 is further provided with a controller 6, a switch is arranged on the controller 6, and the switch is used for controlling the heating element and the conveying mechanism.

Preheating the IXPE sheet by using the foaming preheating device for the belt-shaped high polymer material, and comprising the following steps of:

firstly, opening a heating element 15 and a conveying mechanism on a controller 6 to perform pre-operation of the device, enabling each preheating zone to reach a preset temperature (preheating of IXPE sheets requires that the temperature of a first preheating zone 12 is controlled to be 60-70 ℃, the temperature of a second preheating zone 13 is controlled to be 75-85 ℃, the temperature of a third preheating zone 14 is controlled to be 90-110 ℃), observing the running condition of the conveying belt, and tensioning a power zone 22 by adjusting the position of a nut 51 if loosening is found; and then placing IXPE sheets in a holding area 21 (the IXPE sheets are sent to the holding area 21 by an unreeling device through a traction device), driving a power area 22 to operate by a first roller 3, further driving the holding area 21 to convey the IXPE sheets to the heating box body 1, enabling the IXPE sheets to sequentially pass through three preheating areas, realizing sufficient and uniform preheating under the radiation heating of an electric heating pipe, finally sending the IXPE sheets out from the outlet end of the heating box body 1, and finishing the preheating process.

Example 2

A foaming preheating device for a tape-shaped polymer material, which has the same basic structure as that of example 1, except that: the second roller 4 is positioned at the near-outlet end in the heating box body 1, the upper part of the outlet end of the heating box body 1 is provided with an air outlet 16, the rest positions are sealed, the sheet is sent out from the air outlet 16 after being preheated, and waste gas generated in the preheating process is also sent out from the air outlet 16.

This detailed description is to be construed as illustrative only and is not to be taken as limiting the invention, as any changes that may be made by a person skilled in the art after reading the present specification will be protected by the patent laws within the scope of the appended claims.

Claims

1. The utility model provides a banding macromolecular material's foaming preheating device, includes heating box (1) and transports banding macromolecular material extremely the conveying mechanism of heating box (1), its characterized in that: the conveying mechanism comprises a circular conveying closed-loop conveying belt (2) which is arranged in the heating box body (1) and one end of which extends to the outside of the inlet end of the heating box body (1), and a first roller (3) and a second roller (4) which are wound at the two ends of the conveying belt (2), wherein the first roller (3) is arranged outside the heating box body (1), and at least one of the first roller (3) and the second roller (4) is an active roller driven to rotate by power equipment; the conveying belt (2) is made of flexible high polymer materials and comprises a laying-aside area (21) for placing the strip-shaped high polymer materials and power areas (22) which are arranged on two sides of the laying-aside area (21) and drive the laying-aside area (21) to move.

2. The apparatus for preheating and foaming a tape-shaped polymer material according to claim 1, wherein: the rest area (21) is of a grid-shaped structure.

3. The apparatus for preheating and foaming a tape-shaped polymer material according to claim 1, wherein: the flexible high polymer material is polytetrafluoroethylene.

4. The apparatus for preheating and foaming a tape-shaped polymer material according to claim 1, wherein: the positions, close to the two end parts, of the first roller (3) are respectively provided with a clamping groove (31), and the lower surface of the power area (22) is provided with a driving strip attached to the clamping grooves (31).

5. The apparatus for preheating and foaming a tape-shaped polymer material according to claim 1, wherein: and both ends of the first roller (3) are provided with screws (5) used for tensioning the power area (22).

6. The apparatus for preheating and foaming a tape-shaped polymer material according to claim 5, wherein: the above-mentioned

The first roller (3) is installed on the heating box body (1) through a shaft sleeve (32), one end of the screw rod (5) is abutted to the shaft sleeve (32), and the other end of the screw rod is fixed on the heating box body (1) in a rotatable and adjustable mode.

7. The apparatus for preheating and foaming a tape-shaped polymer material according to claim 1, wherein: the heating box body (1) comprises three preheating zones, and a heat insulation plate (11) is arranged between every two adjacent preheating zones; the top wall of the preheating zone is provided with a heating element (15), and the temperature control systems of the heating elements (15) of different preheating zones are mutually independent.

8. The apparatus for preheating and foaming a tape-shaped polymer material according to claim 1, wherein: the heating box body (1) is obliquely and upwards arranged from the inlet end to the outlet end.

9. The apparatus for preheating and foaming a tape-shaped polymer material according to claim 1, wherein: the outer surface of the heating box body 1 is provided with a controller 6, the controller 6 is provided with a switch, and the switch is used for controlling the heating element and the conveying mechanism.