CN116243413A

CN116243413A - Microprism reflecting material and production method thereof

Info

Publication number: CN116243413A
Application number: CN202310247755.0A
Authority: CN
Inventors: 曾宏定
Original assignee: Quanzhou Dingfei Reflective Material Co ltd
Current assignee: Quanzhou Dingfei Reflective Material Co ltd
Priority date: 2023-03-15
Filing date: 2023-03-15
Publication date: 2023-06-09

Abstract

The invention relates to the field of reflective material production, in particular to a microprism reflective material which comprises a composite layer, wherein the composite layer comprises a protective transparent layer, a middle reflective layer, an adhesive layer and a release paper layer from top to bottom, the adhesive layer is connected with the middle reflective layer and the release paper layer, a positioning hole is formed in the middle reflective layer, and the adhesive layer is adhered with the protective transparent layer through the positioning hole.

Description

Microprism reflecting material and production method thereof

Technical Field

The invention relates to the field of reflective material production, in particular to a microprism reflective material and a production method thereof.

Background

The reflection principle of the microprism reflecting film is different from engineering grade (lens embedded type) reflecting film and high-strength grade (lens sealing type) reflecting film, the engineering grade and the high-strength grade reflecting film both adopt glass bead reflection principle, and the reflection principle of the microprism reflecting film is that refraction and reflection of the microprism are applied. The main representative products of microprism reflective films can be divided into four main categories in terms of retroreflection characteristics and structure: the novel prism type reflecting film is characterized by comprising a truncated prism which is focused on long-distance recognition, a truncated prism which is focused on short-distance large-angle recognition, a full prism which is compatible with long-distance recognition performance and short-distance recognition performance, and a novel prism type reflecting film which combines the prism technologies with novel material technologies. They are new retroreflective materials that meet the needs of different layers, which are in compliance with the diversification of application layers, and emerge in recent years.

In recent years, under the condition that the structure of the prism-shaped reflecting film is not changed greatly, innovation is focused, and the realization of richer light control effects and richer material characteristics through different material processing technologies is more turned to finish different retroreflection capacities and different flexibilities so as to adapt to the requirements of different layers. The reflecting films commonly called as super strong grade, super strong grade and prism engineering grade in the market are all new forms of prism reflecting films. The truncated prisms of the reflective films have basically the same structure, but different material processing technologies form different reflective effects, excellent weather resistance and processing adaptability so as to meet different application requirements.

The invention patent with the Chinese patent application number of 201710361806.7 discloses a microprism type reflective film and a manufacturing method thereof, wherein the reflective film sequentially comprises an air layer bottom layer, a prism layer, a middle functional layer and a functional surface layer from bottom to top. The manufacturing method comprises the following steps: a. respectively drying and preheating the prism film, the middle functional layer film and the functional surface layer film; b. c, heating the prism layer film dried and preheated in the step a by an elastic mirror surface steel roller, and then molding the prism layer film into a mold with a re-carved micro prism structure; c. c, heating the intermediate functional layer film and the functional surface layer film which are dried and preheated in the step a through an elastic mirror steel roller, then performing mould pressing and compounding into a mould belt, and performing thermal compounding with the prism layer film which is subjected to the step b, wherein the prism layer film is subjected to secondary re-engraving of a micro prism structure; d. and c, cooling and stripping the film on the die belt after the step c, and welding the film with the white reflective film. The reflective film and the manufacturing method thereof can be combined with 2-3 different materials, the production is flexible, and the product performance is improved; when the microprism type reflective film and the conventional microprism reflective film are applied to traffic occasions, the brightness is easy to decay along with the influence of time and environment, so that people cannot read the mark content or take more time to read in the reading distance.

Disclosure of Invention

Therefore, the invention provides a microprism reflecting material, which solves the technical problem that the reflecting intensity of the existing reflecting film is influenced to be attenuated due to the environment and the long use time, and simultaneously provides a production method of the microprism reflecting material.

In order to achieve the above purpose, the present invention adopts the following technical scheme: the utility model provides a microprism reflecting material, includes the composite bed, the composite bed is from top to bottom including protection transparent layer, middle reflecting layer, viscose layer and from the type ply, the viscose layer is connected middle reflecting layer with from the type ply, be provided with the locating hole on the middle reflecting layer, the viscose layer is permeating the locating hole with the protection transparent layer bonds.

Further, the protective transparent layer, the intermediate reflecting layer and the adhesive layer are connected in a reinforcing manner by hot pressing.

Further, a micro-prism light reflecting structure is arranged on the middle reflecting layer, and the micro-prism light reflecting structure is a rectangular pyramid structure.

The production process of reflecting microprism material includes the following steps:

1) Preparing materials; preparing a protective transparent layer material roller, an adhesive layer material roller and a release paper layer material roller, and respectively placing the protective transparent layer material roller, the adhesive layer material roller and the release paper layer material roller on a frame;

2) Preparing an intermediate reflecting layer;

a. preparing a forming roller, firstly cutting the raw material of the reflective film die according to the required size by a metal cutting device, cutting the edge of the cut reflective film die again by the metal cutting device, ensuring the flatness of the edge, connecting the cut reflective film die head and tail, welding the cut reflective film die head and tail by a metal welding device to form a cylinder, sleeving the cylindrical reflective film die on a roller, and forming the forming roller;

b. introducing the raw material film into a forming roller, and carrying out heating forming on the raw material film by matching with a heating roller, wherein the raw material film after passing through the forming roller is provided with a microprism structure;

c. b, introducing the raw material film in the step b onto a cooling roller for cooling, wherein the cooling is divided into primary cooling and secondary cooling, the temperature of the cooling roller is kept constant at 20-25 ℃ in the primary cooling, the cooling roller is kept constant at 10-15 ℃ in the secondary cooling after the cooling is carried out for 0.5-1 hour at normal temperature after the primary cooling;

d. cooling to obtain an intermediate reflecting layer, and punching the intermediate reflecting layer by a needle roller;

3) Compounding the surface layer; preheating the adhesive layer to enable the upper surface and the lower surface of the adhesive layer to be sticky, and introducing the protective transparent layer, the middle reflecting layer, the adhesive layer and the release paper layer into a heating composite roller together for surface layer composite;

4) Pressurizing and compounding; and introducing the compounded composite layer into a pressure roller wheel for pressure compounding.

Further, the head-tail welding process of the reflective film die in the step a) in the step 2) through the metal welding device comprises two welding operations, namely primary welding and secondary reinforcement welding.

Further, the metal welding device comprises a frame, a workbench and a laser welding device, wherein the workbench is fixedly arranged on the frame, the workbench is of a rectangular structure, a working groove is formed in the upper surface of the workbench, the working groove is formed in the width direction of the workbench and penetrates through the workbench in the width direction, the working groove comprises a lower bottom surface and two oppositely arranged side surfaces, a rotating mechanism is arranged in the working groove and comprises a driving rotating shaft, a driven rotating shaft and a placement plate, the driving rotating shaft and the driven rotating shaft penetrate through the placement plate and are arranged on two side surfaces of the working groove in a supporting mode, the driving rotating shaft rotates in the axis direction of the driving rotating shaft through a rotating motor, and an electromagnetic adsorption device is integrally arranged in the placement plate; the laser welding device comprises a frame, a workbench, a laser welding gun and a laser welding box, wherein the frame is provided with a movable guide rail, the movable guide rail is arranged along the length direction of the workbench, a first driving device is arranged on the movable guide rail, the laser welding device is driven by the first driving device to reciprocate on the movable guide rail, the laser welding device comprises an electric telescopic shaft, a laser welding box, a laser welding gun and a positioning mechanical arm, the electric telescopic shaft is connected with the first driving device and the laser welding box, the laser welding box can reciprocate along the width direction of the workbench through the electric telescopic shaft, the laser welding gun is arranged on the lower bottom surface of the laser welding box, and the positioning laser head is arranged on the lower bottom surface of the laser welding box.

Further, a main rotating hole and an auxiliary rotating hole are formed in the side face of the working groove, the auxiliary rotating holes are symmetrically formed in two sides of the main rotating hole, the auxiliary rotating holes are semicircular, the driving rotating shaft is inserted into the main rotating hole, and the driven rotating shaft is inserted into the auxiliary rotating hole.

Further, a compound vibration motor is integrally arranged in the storage plate, and the vibration mode of the compound vibration motor is linear vibration.

Further, the compound vibration motor can enable the object placing plate to vibrate back and forth along the length direction of the workbench or vibrate back and forth along the width direction of the workbench on the horizontal plane, when the object placing plate vibrates back and forth along the length direction of the workbench, the vibration frequency is 8-12 times per second, the vibration range is 0.8-1.2mm back and forth with the initial position as a reference, when the object placing plate vibrates back and forth along the width direction of the workbench, the vibration frequency is 3-5 times per second, and the vibration range is 1-3mm back and forth with the out-of-work position as a reference.

Further, the positioning mechanical arm is arranged on the side face of the laser welding box and comprises an arm body and a fixing plate arranged at the tail end of the free end of the arm body.

By adopting the technical scheme, the invention has the beneficial effects that:

1. compared with the existing microprism reflecting film, the microprism reflecting film provided by the invention has the advantages that the punching is carried out on the middle reflecting layer, the purpose of punching is to ensure that the adhesive on the adhesive layer can be directly contacted and bonded with the transparent protective layer in the process of mutually bonding and compounding the surface layers, the treatment has two points, firstly, the transparent protective layer and the adhesive layer are bonded and bonded, the middle reflecting layer is clamped between the transparent protective layer and the adhesive layer, the middle reflecting layer can be protected, and the service life of the middle reflecting layer is prolonged; secondly, transparent protective layer and viscose layer adhere in advance, have guaranteed to carry out later and can not take place to slide between each surface course of hot pressing pressurization complex in-process, and can connect inseparabler between each surface course.

2. In the step c, the raw material film is introduced into a cooling roller for secondary cooling operation, and the method has the following advantages: the raw material film formed by the forming roller and the heating roller is provided with the micro-prism structure on the surface layer, the micro-prism structure is at a high temperature and extremely unstable, the micro-prism structure layer can be fixed on the raw material film after the first cooling operation, the cooling roller for the first cooling operation keeps constant temperature of 20-25 ℃, but the raw material film at the moment is not provided with bending performance, namely can not be rolled and stored, when the raw material film is bent, the surface micro-prism structure can be damaged, the conventional treatment method is to directly place the raw material film at normal temperature for more than 24 hours, so that the micro-prism structure is firmly fixed on the raw material film.

3. And d, cooling in the step, so as to obtain an intermediate reflecting layer, punching the intermediate reflecting layer by a needle roller, wherein the purpose of the intermediate reflecting layer after cooling is stable in property, and damage to a micro prism structure on the surface of the intermediate reflecting layer caused by vibration in the punching process is avoided.

4. In the preparation process of the forming roller, the reflective film mold is the most important link, because the reflective film mold is a key component for preparing the middle reflective layer, the quality of the middle reflective layer directly determines the reflective performance of the finished reflective film, the reflective film mold needs to ensure the flatness of a welding seam at the head and tail welding positions to ensure that the welding seam is sleeved on the forming roller and the whole body is flat and seamless, therefore the metal welding device adopted in the invention, the existing metal welding device is usually used for splicing the metal parts to be welded into a piece, a welding line is formed between the metal parts, and then an operator controls a laser welding gun to weld through a rocker, the defect is that the operation proficiency of the operator is very tested in the welding process, the welding precision is difficult to be ensured, the welding process must be smooth and stable, the stay time at the same point is overlong, and the welding seam is not attractive and even the welding failure is caused; according to the invention, the working table is provided with the working groove, the working groove is internally provided with the object placing plate, the object placing plate is used for placing the metal piece to be welded, when the metal piece to be welded is placed, the inclination angle of the object placing plate can be adjusted to enable the metal piece to be inclined towards the direction of an operator, then the metal piece to be welded is spliced manually in advance, and the electromagnetic adsorption device is started in the splicing process, so that the metal piece to be welded can be fixed on the object placing plate to prevent the metal piece to be welded from shifting; in the welding process, dotting is performed on the welding joint in advance, then the laser welding gun performs welding operation along a dotting path, and meanwhile, the positioning mechanical arm in the welding process provides downward pressure for the metal parts to be welded, so that the two metal parts to be welded cannot shake in the welding process, and the welding success rate is guaranteed.

5. The driving rotating shaft and the driven rotating shafts are erected in the working groove and penetrate through the object placing plate, the driving rotating shafts provide main rotating driving force in the rotating process, the two driven rotating shafts provide auxiliary rotation for the driving rotating shafts, the driven rotating shafts are arranged on two sides of the driving rotating shafts, and the purpose is to prevent the object placing plate from tilting after bearing pressure when a metal piece to be welded is placed on the object placing plate, and the driven rotating shafts provide stability assistance for the object placing process and the rotating process of the object placing plate; the auxiliary rotating hole is in a semicircular arc shape, so that the moving track of the driven rotating shaft is limited, and further, the driven rotating shaft just abuts against the two ends of the auxiliary rotating hole after the object placing plate is inclined, and further, the stability of the object placing process is guaranteed.

6. The compound vibration motor is integrated in the storage plate, the compound vibration motor is formed by installing two vibration motors with the same model on the vibration machine body, the vibration mode is linear vibration, namely the vibration track of the vibration body is linear on the horizontal plane.

7. The composite vibration motor comprises two vibration modes, wherein one vibration mode can enable the object placing plate to vibrate back and forth along the length direction of the workbench on the horizontal plane, the other vibration mode enables the object placing plate to vibrate back and forth along the width direction of the workbench on the horizontal plane, the two vibration modes in different directions are used for matching two laser welding operations, when the object placing plate vibrates back and forth along the length direction of the welding workbench, the vibration frequency is 8-12 times/second, the vibration range is 0.8-1.2mm back and forth by taking an initial position as a reference, when a laser welding gun performs welding operation along a preset track, the default object placing plate is stationary in the existing welding process, the welding track of the laser welding gun is a welding seam, but errors cannot be avoided in the welding process, and the common solution is that the laser welding gun is manually controlled to repair after observing the deviation part in the later period, but the risk of damaging the original welding seam is easy to exist in the repairing process; when the first welding operation is performed by the invention, the laser welding gun performs the welding operation according to the path after the pre-dotting and positioning, and the object placing plate vibrates back and forth along the length direction of the workbench, namely the left and right directions of the corresponding welding line, so that the back and forth vibration can ensure that the welding line formed after the first welding is wound on the welding line in an S shape; when the welding machine vibrates back and forth along the width direction of the workbench, the vibration frequency is 3-5 times/second, the vibration range is 1-3mm back and forth based on the initial position, the vibration aims to meet the requirement of secondary welding operation, after the primary welding operation, the welding seam is wound on a welding line in an S shape, the welding machine is used as primary welding, the primary fixing of two metal parts to be welded is realized, meanwhile, a cushion is provided for the secondary welding operation, the object placing plate vibrates back and forth along the width direction of the workbench in the secondary welding process, the vibration direction is the length direction of a welding line, the laser welding gun welds along the opposite direction of a preset welding path, and the object placing plate vibrates back and forth along the welding line direction is matched, so that repeated welding of the welding line can be ensured on unit time and unit path, the welding seam formed after the primary welding operation is melted to form a new welding seam, the new welding seam is widened compared with the original welding line, and the S-shaped welding seam formed by the primary welding operation is completely covered at the same time, and the attractiveness and firmness are realized.

8. The positioning mechanical arm comprises an arm body and a fixing plate arranged at the free end of the arm body, wherein the arm body has six degrees of freedom and can freely move in a three-dimensional space, the fixing plate at the tail end of the free end of the arm body is used for being matched with a storage plate with an electromagnetic magnetic attraction function, downward pressure is provided from the vertical direction, and better clamping effect is provided for metal pieces to be welded.

Drawings

FIG. 1 is a schematic diagram of a layered structure of a microprismatic retroreflective material of the present invention;

FIG. 2 is a cross-sectional view of a layered structure of a microprismatic retroreflective material of the present invention;

FIG. 3 is a top view of an intermediate reflective layer of microprismatic retroreflective material of the present invention;

FIG. 4 is a schematic perspective view of a metal welding device according to the present invention;

FIG. 5 is a schematic diagram of the front structure of a metal welding device according to the present invention;

FIG. 6 is an enlarged view at A in FIG. 5;

FIG. 7 is a schematic perspective view of a workbench in a metal welding apparatus in accordance with the present invention;

FIG. 8 is a schematic view showing the internal structure of a table in the metal welding apparatus according to the present invention;

FIG. 9 is a schematic top view of a table of the metal welding apparatus of the present invention;

FIG. 10 is a schematic view of the structure of the lower bottom surface of the fixing plate according to the present invention;

FIG. 11 is a schematic view of a first welding trace of a retroreflective sheeting mold in accordance with the present invention;

fig. 12 is a schematic view of a second welding trace of the reflective film mold according to the present invention.

Detailed Description

The invention will now be further described with reference to the drawings and detailed description.

Referring to fig. 1 to 12, a micro-prism reflective material is proposed in this embodiment, the micro-prism reflective material comprises a composite layer 1, the composite layer 1 comprises a protective transparent layer 11, a middle reflective layer 12, an adhesive layer 13 and a release paper layer 14 from top to bottom, the adhesive layer 13 is connected with the middle reflective layer 12 and the release paper layer 14, a positioning hole 121 is provided on the middle reflective layer 12, the adhesive layer 13 is adhered to the protective transparent layer 11 through the positioning hole 121, the protective transparent layer 11, the middle reflective layer 12 and the adhesive layer 13 are reinforced and connected by hot pressing, a micro-prism reflective structure 122 is provided on the middle reflective layer 12, and the micro-prism reflective structure 122 is in a rectangular pyramid structure and is directly formed on the middle reflective layer 12 by hot pressing through a reflective film mold.

Meanwhile, the embodiment provides a method for preparing the microprism reflecting material, which comprises the following steps:

2) Preparing an intermediate reflective layer 12;

3) Compounding the surface layer; preheating the adhesive layer to enable the upper surface and the lower surface of the adhesive layer to be sticky, and introducing the protective transparent layer 11, the middle reflecting layer 12, the adhesive layer 13 and the release paper layer 14 into a heating composite roller together for surface layer composite;

In the method, the head and tail welding process of the reflective film die in the step a in the step 2) through the metal welding device comprises two welding operations, namely primary welding and secondary reinforcement welding.

The metal welding device comprises a frame 2, a workbench 3 fixedly arranged on the frame 2 and a laser welding device 4;

the workbench 3, the workbench 3 is of a cuboid structure, two sides defining the length direction X of the workbench 3 are long sides, two sides defining the width direction Y are wide sides, a working groove 31 is formed in the upper surface of the workbench 3, the working groove 31 is formed along the width direction Y of the workbench 3 and penetrates through the workbench 3 in the width direction Y, the working groove 31 comprises a lower bottom surface 311 and two oppositely arranged side surfaces 312, a rotating mechanism is arranged in the working groove 31, the rotating mechanism comprises a driving rotating shaft 8, a driven rotating shaft 9 and a placing plate 51, the driving rotating shaft 8 and the driven rotating shaft 9 penetrate through the placing plate 51 and are arranged on two side surfaces 312 of the working groove 31, the driving rotating shaft 8 rotates along the axis direction of the workbench by a rotating motor, an electromagnetic adsorption device is integrally arranged in the placing plate 51, the driving rotating shaft 8 and the driven rotating shaft 9 are fixedly connected with the placing plate 51, the driving rotating shaft 8 rotates to drive the placing plate 51, and the rotating motor and the electromagnetic adsorption device arranged in the placing plate 51 are unknown at the same time;

a laser welding device 4, a movable guide rail 6 is arranged on the frame 2, the movable guide rail 6 is arranged along the length direction X of the workbench 3, a first driving device 7 is arranged on the movable guide rail 6, the first driving device 7 is a driving motor, the laser welding device 4 is arranged on the first driving device 7 and reciprocates on the movable guide rail 6 under the driving of the first driving device 7, the laser welding device 4 comprises an electric telescopic shaft 41, a laser welding box 42, a laser welding gun 43 and a positioning mechanical arm 44, the electric telescopic shaft 41 is connected with the first driving device 7 and the laser welding box 42, the laser welding box 42 can reciprocate along the width direction Y of the workbench 3 through the electric telescopic shaft 41, the laser welding gun 43 is arranged on the lower bottom surface of the laser welding box 42, the laser positioning head 45 and the laser welding gun 43 are focused on the same point and are used for providing a dotting and positioning function for a welding path, the side surface 312 of the working groove 31 is provided with two main rotating holes 32 and auxiliary rotating holes 33, the auxiliary rotating holes 33 are symmetrically arranged on two sides of the main rotating holes 32, the auxiliary rotating holes 33 are semicircular, the driving rotating shaft 8 is inserted into the main rotating holes 32, the driven rotating shaft 9 is inserted into the auxiliary rotating holes 33, the object placing plate 51 is internally integrated with a compound vibrating motor, the vibrating form of the compound vibrating motor is linear vibration, wherein the compound vibrating motor is not shown in the figure, the compound vibration motor can make the object placing plate 51 vibrate back and forth along the length direction X of the workbench 3 or vibrate back and forth along the width direction Y of the workbench 3 on a horizontal plane, when the object placing plate vibrates back and forth along the length direction X of the workbench 3, the vibration frequency is 8-12 times/second, the vibration range is 0.8-1.2mm back and forth based on the initial position, when the object placing plate vibrates back and forth along the width direction Y of the workbench 3, the vibration frequency is 3-5 times/second, the vibration range is 1-3mm back and forth based on the initial position, the description is expressed as description of the working parameter range, and in the embodiment, the specific setting parameters are as follows: when the positioning mechanical arm 44 vibrates back and forth along the length direction X of the workbench 3, the vibration frequency is 8 times/second, the vibration range is 0.8mm back and forth based on the initial position, when the positioning mechanical arm vibrates back and forth along the width direction Y of the workbench 3, the vibration frequency is 3 times/second, the vibration range is 1mm back and forth based on the initial position, the positioning mechanical arm 44 is arranged on the side surface of the laser welding box 42, the positioning mechanical arm 44 comprises an arm body 441 and a fixing plate 442 arranged at the tail end of the free end of the arm body 441, the fixing plate 442 is of a hollow rectangular annular structure, balls 4421 are arranged on the lower surface of the fixing plate 442, the fixing plate 442 is ensured to be adsorbed synchronously when the electromagnet adsorbs the metal plate C, the adsorbed fixing plate 442 can provide a lower pressure for the metal plate C in the vertical direction, the welding process of the positioning mechanical arm 44 is ensured not to shake, and the balls 4421 can ensure that the fixing plate 442 receives horizontal friction force to be reduced when the fixing plate 442 moves along with the laser welding gun 43.

Meanwhile, the application method of the metal welding device is provided, and the application method comprises the following steps:

1) Placing a piece to be welded; the electromagnet is electrified, two metal plates C which are subjected to trimming by the cutting device in advance are placed on the object placing plate 51 on the workbench 3, the object placing plate 51 is inclined to one side of an operator by controlling the inclination angle of the object placing plate 51 after placement, so that the operator can conveniently calibrate the joint of the two metal plates C for the first time by naked eyes, and the object placing plate 51 is restored to a horizontal state after the first calibration;

2) Laser pre-positioning; forming a welding line after the edges of the two metal plates C are welded, and controlling a laser positioning head 45 on a laser welding device 4 to perform dotting on the welding line by an operator through a computer, wherein the working path of a laser welding gun 43 is linear movement between two adjacent laser positioning points;

3) Primary welding operation; starting a composite vibration motor arranged in the object placing plate 51 to vibrate back and forth along the length direction X of the workbench 3, and further performing welding operation by the laser welding gun 43 along a preset welding route, wherein after primary welding, the welding seam is a small-space wavy line arranged on the welding line (as shown in figure 11);

4) Secondary welding operation; the position of the laser welding gun 43 is kept unchanged, a composite vibration motor arranged in the object placing plate 51 is started to vibrate back and forth along the width direction Y of the workbench 3, further, the laser welding gun 43 starts to work, the working path is a reverse path of a path formed after the working is preset, and a welding line is overlapped with the welding line and completely covers a welding line formed by primary welding (as shown in figure 12);

5) And (5) powering off the electromagnet and finishing welding the metal plate C.

In the implementation of the method, the moving speed of the laser welding gun 43 in the step 3) is 8mm/s when performing welding along the preset welding route, and the moving speed of the laser welding gun 33 in the step 4) is 3mm/s when performing welding along the reverse direction of the welding route, wherein the moving speed is used for matching the vibration frequency of the composite vibration motor, and when the frequency of the composite vibration motor is adjusted, the moving speed of the laser welding gun 33 can also be adaptively adjusted to meet the welding precision requirement, and specifically: the moving speed of the laser welding gun in the step 3) is 8mm-12mm/s when the laser welding gun performs welding operation along a preset welding route, and the moving speed of the laser welding gun in the step 4) is 3mm-5mm/s when the laser welding gun performs welding operation along the reverse direction of the welding route.

Wherein, the fixed plate is hollow rectangle annular structure, is provided with the ball on the lower surface of fixed plate, and the setting of ball can reduce the area of contact between fixed plate and the metalwork that waits to weld and the frictional force between the two to guaranteed not to exert an influence to its vibration.

In the welding process, the metal piece is fixed on the object placing plate in the placing process of the metal piece through adopting an electromagnet to adsorb, meanwhile, the magnetic attraction of the object placing plate can be controlled through controlling the electrified quantity of the electromagnet in a fixed mode of the electromagnet, pre-dotting is performed on a welding line manually before laser welding, the purpose of dotting is to provide a moving route for a laser welding gun, the working path of the laser welding gun is linear motion between two adjacent laser positioning points, and when the positioning points are more, the contact ratio between the laser welding gun and the welding line is higher, and welding is more accurate.

The first welding operation is carried out firstly during the welding operation, the object placing plate vibrates back and forth along the length direction of the workbench 3 during the first welding operation, the length direction of the workbench is the width direction of a welding line, the small-spacing wavy (S-shaped) lines are formed after the welding operation of the laser welding gun, the first welding operation is pre-welding, the two metal plates are pre-fixed, and meanwhile, the formed welding seam can provide a laying pad for the second welding operation.

During secondary welding operation, the position of the laser welding gun is kept unchanged, the object placing plate vibrates back and forth along the width direction of the workbench 3, namely the length direction of a welding line, the laser welding gun is matched to ensure that the back and forth welding operation can be performed in unit time and unit distance, on one hand, the back and forth welding effect can enable the welding completion degree to be higher, the finished product to be more stable, on the other hand, the width of the welding line can be enlarged in a back and forth welding mode, the welding line formed by secondary welding completely covers the S-shaped welding line formed by primary welding, and the finished product is more attractive

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A microprism retroreflective material comprising a composite layer characterized in that: the composite layer comprises a protective transparent layer, a middle reflecting layer, an adhesive layer and a release paper layer from top to bottom, wherein the adhesive layer is connected with the middle reflecting layer and the release paper layer, a positioning hole is formed in the middle reflecting layer, and the adhesive layer is adhered with the protective transparent layer through the positioning hole.

2. A microprismatic retroreflective material according to claim 1, wherein: the protective transparent layer, the middle reflecting layer and the adhesive layer are in reinforced connection through hot pressing.

3. A microprismatic retroreflective material according to claim 2, wherein: the middle reflecting layer is provided with a microprism reflecting structure which is a rectangular pyramid structure.

4. A method of producing a microprismatic retroreflective material according to claim 3, wherein: the method comprises the following steps:

2) Preparing an intermediate reflecting layer;

5. The method for producing a microprism retroreflective material of claim 4, wherein: the head and tail welding process of the reflective film die in the step a) in the step 2) is carried out by a metal welding device, wherein the two welding operations comprise primary welding and secondary reinforcement welding.

6. The method for producing a microprism retroreflective material of claim 5, wherein: the metal welding device comprises a frame, a workbench and a laser welding device, wherein the workbench is fixedly arranged on the frame, the workbench is of a rectangular structure, a working groove is formed in the upper surface of the workbench, the working groove is formed in the width direction of the workbench and penetrates through the workbench in the width direction, the working groove comprises a lower bottom surface and two oppositely arranged side surfaces, a rotating mechanism is arranged in the working groove and comprises a driving rotating shaft, a driven rotating shaft and a placement plate, the driving rotating shaft and the driven rotating shaft penetrate through the placement plate and are arranged on two side surfaces of the working groove, the driving rotating shaft rotates in the axis direction of the driving rotating shaft through a rotating motor, and an electromagnetic adsorption device is integrally arranged in the placement plate; the laser welding device comprises a frame, a workbench, a laser welding gun and a laser welding box, wherein the frame is provided with a movable guide rail, the movable guide rail is arranged along the length direction of the workbench, a first driving device is arranged on the movable guide rail, the laser welding device is driven by the first driving device to reciprocate on the movable guide rail, the laser welding device comprises an electric telescopic shaft, a laser welding box, a laser welding gun and a positioning mechanical arm, the electric telescopic shaft is connected with the first driving device and the laser welding box, the laser welding box can reciprocate along the width direction of the workbench through the electric telescopic shaft, the laser welding gun is arranged on the lower bottom surface of the laser welding box, and the positioning laser head is arranged on the lower bottom surface of the laser welding box.

7. The method for producing a microprism retroreflective material of claim 6, wherein: the side of the working groove is provided with a main rotating hole and auxiliary rotating holes, the auxiliary rotating holes are symmetrically arranged on two sides of the main rotating hole, the auxiliary rotating holes are semicircular, the driving rotating shaft is inserted into the main rotating hole, and the driven rotating shaft is inserted into the auxiliary rotating hole.

8. The method for producing a microprismatic retroreflective material according to claim 7, wherein: the compound vibration motor is integrated in the storage plate, and the vibration mode of the compound vibration motor is linear vibration.

9. The method for producing a microprism retroreflective material of claim 8, wherein: the compound vibration motor can enable the object placing plate to vibrate back and forth along the length direction of the workbench or vibrate back and forth along the width direction of the workbench on the horizontal plane, when the object placing plate vibrates back and forth along the length direction of the workbench, the vibration frequency is 8-12 times per second, the vibration range is 0.8-1.2mm back and forth by taking the initial position as a reference, when the object placing plate vibrates back and forth along the width direction of the workbench, the vibration frequency is 3-5 times per second, and the vibration range is 1-3mm back and forth by taking the out position as a reference.

10. The method for producing a microprismatic retroreflective material according to claim 9, wherein: the positioning mechanical arm is arranged on the side face of the laser welding box and comprises an arm body and a fixing plate arranged at the tail end of the free end of the arm body.