RU2593302C2 - Device for uv led irradiation - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: claimed device comprises the camera, platform composed of the matrix to support the article, control unit connected with LEDs power supply and electric drive. LEDs are secured at two or more flat beds. Every bed is secured by the bars at two flat flanges of the bearing support to locate said bars radially relative to bearing support lengthwise support. Reflectors composed of the LED channels are made at one side of the bed. Plate-like ribbing is made at the opposite side to make a heat sink. Split bars have through grooves. The device can incorporate one and more bearing supports. Said bearing support can accommodate one and more pairs of flanges.

EFFECT: higher quality of hardening.

5 cl, 6 dwg

Description

The invention relates to installations for curing polymeric materials with radiant energy, in particular ultraviolet radiation, and can be used in the manufacture of bulk parts.

Accepted abbreviations: UV-ultraviolet; UFO - ultraviolet irradiator (irradiation); LED - LED, light emitting diode

A device for curing a polymer material according to the patent of the Russian Federation No. 2077983 is known. The device comprises a camera body for processing material connected to a gas supply and extraction system for light absorption, a radiation source with optical means for directing the light flux; a platform for laying the product, on the lower surface of which there is a light receiving unit in the form of pass-through cameras with lenses at the input and radiation receivers at the output connected to the information-measuring system. Additional radiation sources are fixed with the possibility of changing the position in height above the passage chambers.

The device has limitations on the processing material, which must be semi- or transparent. The illumination of the surface of the product is adjusted by fixing each radiation source in height and is complicated by the supply and pumping of light-absorbing gas. The device provides a vehicle for raising and lowering the housing with emitters. Everything as a whole leads to a complication of the device.

The closest in the set of essential features is the ultraviolet LED illuminator according to the patent of the Russian Federation No. 118917 for a utility model that contains a camera, a plate placed inside the camera for installing the workpiece and ultraviolet radiation sources, which use LEDs mounted on the inner surface of the lid and the camera outside plate movement zones, LED power supply unit, control unit, electric motor with gearbox at the bottom of the chamber with the possibility of vertical movement joints of the plate in the guide grooves, one plate of the plate moves externally along a vertically mounted ruler on the camera.

In the known installation, it is impossible to cure parts of complex shape or long, bulky with ensuring the proper quality of the entire surface of the processed material; in view of this, the irradiation time is also increased to achieve curing of the coating in the shadow areas.

The technical task of the invention is to improve the quality of the cured products by aligning the power density of the irradiation with UV emitters of products of spatially extended and complex shapes without complicating the design and control methods of the curing process.

The problem is solved by the claimed invention.

Declares:

The device for ultraviolet LED irradiation includes a camera, a platform installed inside the camera to accommodate the workpiece, an ultraviolet radiation source in the form of LEDs arranged orderly on the base inside the camera, a control unit to which the LED power supply unit and an electric drive are connected for relative movement of the platform and ultraviolet emitters. In contrast to the prototype, the platform is made in the form of a matrix for placement and interface with the workpiece cylindrical or similar to a cylindrical or other three-dimensional shape. LEDs are fixed on two or more flat bases, each base is fixed by means of rods fastened to the ends of the base, on two flat flanges belonging to the bearing support, with the possibility of radial arrangement of the rods of one or more bases relative to the longitudinal axis of the bearing support, while on the side of the bases, facing the workpiece, made reflectors parabolic in shape or close to parabolic in the form of channels for LEDs, and on the other side of the bases made ribbing in the form plates forming the heat sink, wherein the rods are made detachable, with a compound of the node in the form of transverse slats and with the through grooves.

The device may have one or more support legs, and one or more pairs of flat flanges may be placed on the support leg. On the rods, through grooves are made with the possibility of adjusting movements of the rods and fixing the position by means of screw clamps; on the transverse slats, the grooves are made in a circular line with a conditional center on the axis of the bearing support. The electric drive provides lifting, and / or moving, and / or rotation of the bearing support.

In the drawings explaining the invention, the mounting of the emitters on a bearing support is shown. In FIG. 1 shows a general diagram of a device. In FIG. 2 shows the placement of the UV emitters 1 on the bases 2 and the fastening of the bases on the flanges 3 of the support 4. In order to avoid overloading of figure 1, only two of the fixed bases are shown. In FIG. Figure 3 shows the base with rows of mounted LED UV emitters 1. On the detachable part of the rod, through grooves are shown located in a circular line with a conditional center on the axis of the bearing support. In FIG. 4 is a diagram of a device for irradiating a cylindrical surface. In FIG. 5 shows the placement of LEDs in the presence of two support columns 4 for curing by UV irradiation of a developed cylindrical surface. In FIG. 6 shows the placement of more than one pair of flanges on a bearing support. Dividing the LED array into modules reduces the load on the rods 5 and facilitates the installation of emitters.

The device for ultraviolet irradiation includes a chamber 6, in which there is a platform in the form of a matrix 7, on which a layer of a composite for UV curing is applied, for example, prepreg 8. The electric drive 9 allows the support 4 to be moved and the UV emitters 1 to be spatially positioned relative to the workpiece , for example, prepreg 8. The operation of the electric drive and the irradiation mode are controlled by the control unit 10 and involves the use of preferably software provision (and can also be organized on the basis of electrical switching circuits).

The LEDs 1 are mounted on two or more flat bases 2. Each base is cantilevered through two rods 5 at the ends of the base on two flat flanges 3 belonging to the support leg 4. Relative to the longitudinal axis of the support leg 4, the base rods are arranged radially. In this case, adjacent emitters on adjacent bases have a minimum gap between them, and the array of emitters forms a cylindrical uniformly irradiating surface for irradiating and curing the product in a cylindrical, or similar to a cylindrical, or other volumetric form. The emitters are equipped with reflectors 11, preferably of parabolic shape, allowing to create a uniform luminous flux of minimal dispersion in order to avoid shadow zones on the treated surface. A uniform luminous flux reduces the UV curing cycle and the quality of the workpiece. For more accurate positioning of the emitters relative to the processing surface, through grooves on the rods are used. The grooves 12 allow you to perform radial installation movements of the rods 5, and the grooves 13 on the transverse bars 14 allow you to perform circular (with a conditional center on the axis of the bearing support) installation movements of the rods. The straps 14 connect the two parts of the rods to each other. Completed installation movements can be fixed, for example, by means of screw clamps (shown in the figures without indicating position).

On the bases on the reverse side of the emitters, ribbing is made in the form of plates 15 forming a heat sink, which creates more favorable conditions for the operation of the emitters, although it is known that the heat fluxes of LED emitters are significantly less than for mercury lamps or IR lamps. In the proposed device, the temperature inside the chamber, as a rule, slightly exceeds the outside temperature.

The described design of the emitters on one basis can be considered as a separate module of the device as a whole, including several modules of the same type, depending on the shape and length of the cured product. Dividing the LED array into modules reduces the load on the rods 5 and facilitates the installation of emitters. So in FIG. 4 shows the possibility of the use and parallel placement of two bearing supports 4 for irradiating a developed cylindrical surface, in FIG. 5 shows the possibility of placing on one bearing support more than one pair of flanges for irradiating the overall product.

The curing process is as follows.

In accordance with the shape of the irradiated product, the position of the bases 2 with the radiators on the supporting support 4 is preliminarily adjusted to ensure, as far as possible, the position of the radiators over the composite.

At the command of the control unit 10, the electric drive moves the module or group of modules into the chamber, and then the voltage from the power supply unit 16 is applied to the LEDs. Uniform irradiation of the entire surface of the product at the same time minimizes the polymerization cycle of the product while ensuring high quality curing, primarily in relation to such indicators as high mechanical strength, resistance to solvents, minimal odor, environmental safety, resistance to cracking during cyclic temperature differences.

At the end of the process, the voltage is automatically removed from the ultraviolet LEDs 1, the support (s) with emitters are removed from the camera, and the workpiece is removed from the camera.

Claims (5)

1. Device for ultraviolet LED irradiation, including a camera, a platform installed inside the camera to accommodate the workpiece, an ultraviolet radiation source in the form of LEDs arranged orderly on the base inside the camera, a control unit to which the LED power supply unit and an electric drive are connected for relative movement of the platform and ultraviolet emitters, characterized in that the platform is made in the form of a matrix for placement and interfacing with the workpiece m of a cylindrical, or similar to a cylindrical, or other three-dimensional shape, while the LEDs are fixed on two or more flat bases, each base is fixed by means of rods fastened to the bases on two flat flanges belonging to the bearing support, with the possibility of a radial arrangement of the rods of one and more bases relative to the longitudinal axis of the bearing support, while on the side of the bases facing the workpiece are made reflectors parabolic or close to parabolic in the form of canals there are ledges for LEDs, and on the other side of the bases there is a ribbing in the form of plates forming a heat sink, the rods being made detachable with the connection unit in the form of transverse bars and with through grooves. 2. The device according to p. 1, characterized in that it includes one or more load-bearing supports. 3. The device according to claim 1, characterized in that one or more pairs of flat flanges are placed on the supporting support. 4. The device according to claim 1, characterized in that the through grooves are made with the possibility of adjusting movements of the rods and fixing the position by means of screw clamps, while on the transverse slats the grooves are made in a circular line with a conditional center on the axis of the bearing support. 5. The device according to p. 1, characterized in that the electric drive is installed to provide lifting, and / or movement, and / or rotation of the bearing support.

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