阅读说明：本技术 长距离皮带输送机输送带接头硫化连接方法 (Vulcanization connection method for conveying belt joint of long-distance belt conveyor ) 是由 刘勉 于 2020-04-30 设计创作，主要内容包括：本发明涉及建筑施工技术领域,尤其涉及一种长距离皮带输送机输送带接头硫化连接方法,通过在确定作业区域后,移除作业区域内的上托辊架,并于作业区域内设置下硫化板并安装作业平台,在作业平台上划出两个输送带的接头的中心线、上接头线、端头线和下接头线,然后沿端头线切割输送机输送带的接头,并沿上接头线和下接头线分别剥离上盖胶和下盖胶并去除部分芯胶,之后进行安装下盖胶组件、交错布置钢丝绳芯和安装下盖胶组件的步骤,然后安装硫化器进行接头硫化工艺,该方法工艺简单,并能够确保长距离输送带机钢丝绳芯输送带接头硫化质量,从而保障了输送带的正常运行,且具有安全性高、可操作性强、经济性好和适用性强的优点。(The invention relates to the technical field of building construction, in particular to a vulcanization connection method for a long-distance belt conveyor belt joint, which comprises the steps of removing an upper supporting roller frame in an operation area after the operation area is determined, arranging a lower vulcanization plate in the operation area, installing an operation platform, marking central lines, upper joint lines, end head lines and lower joint lines of joints of two conveyor belts on the operation platform, then cutting the joints of the conveyor belt of the conveyor along the end head lines, respectively stripping upper cover rubber and lower cover rubber along the upper joint lines and the lower joint lines, removing partial core rubber, then installing lower cover rubber components, arranging steel wire rope cores in a staggered mode, installing lower cover rubber components, installing a vulcanizer to conduct a joint vulcanization process, and is simple in process and capable of ensuring the vulcanization quality of the steel wire rope core conveyor belt joint of the long-distance belt conveyor so as to ensure the normal operation of the conveyor belts, and has the advantages of high safety, strong operability, good economy and strong applicability.)

1. A vulcanization connection method for a joint of a conveying belt of a long-distance belt conveyor, wherein the conveying belt comprises a plurality of steel wire rope cores arranged side by side, an upper cover rubber arranged above the steel wire rope cores and a lower cover rubber arranged below the steel wire rope cores, core rubbers are arranged between every two adjacent steel wire rope cores and between the steel wire rope cores and the upper cover rubber and between the steel wire rope cores and the lower cover rubber, the vulcanization connection method is applied to vulcanization connection of joints of two conveying belts together, and is characterized by comprising the following steps:

step S1, determining an operation area of the joint vulcanization connection of the two conveyer belts, and removing an upper supporting roller frame in the operation area;

step S2, arranging a lower vulcanizing plate of the vulcanizer at the operation area, and building a vulcanizing operation platform on the front side and the rear side of the lower vulcanizing plate;

step S3, respectively placing two conveyor belts on two vulcanization operation platforms, respectively cutting joints of the conveyor belts along end lines after marking central lines, upper joint lines, end head lines and lower joint lines of the joints of the two conveyor belts, wherein the distance between the upper joint lines and the end head lines is larger than the distance between the lower joint lines and the end head lines, and the distance between the upper joint lines and the end head lines is 500-700 mm; the distance between the upper joint line and the lower joint line is 20-40 mm;

step S4, after peeling the upper cover glue along the upper joint line, peeling the lower cover glue along the lower joint line, and partially removing the core glue on the steel wire rope core to ensure that the thickness of the core glue on the steel wire rope core is less than or equal to 0.5 mm;

step S5, placing two conveyer belt joints on a lower vulcanizing plate, and respectively fixing the two conveyer belts on two operation platforms after correcting the positions of the two conveyer belt joints by using the central line;

step S6, cleaning the steel wire rope core, coating a fluxing agent on the steel wire rope core, drying, and then installing a lower cover rubber component on the lower vulcanizing plate, wherein two ends of the lower cover rubber component are respectively matched with the notches of the lower cover rubber of the joints of the two conveying belts;

step S7, arranging the steel wire rope cores of the two conveying belt joints, and enabling the steel wire rope cores of the two conveying belt joints to be sequentially staggered;

step S8, mounting an upper cover rubber component on the steel wire rope core, wherein two ends of the upper cover rubber component are respectively matched with the notches of the upper cover rubber of the joints of the two conveying belts;

and step S9, installing a vulcanizer, and carrying out a joint vulcanization connection process of the two conveyer belts by using the vulcanizer.

2. The method of claim 1, wherein in step S1, the distance between the working area and the tail roller is equal to the length of one belt.

3. The method for vulcanization joining a joint of a conveyor belt of a long-distance belt conveyor according to claim 1, characterized in that in step S2, the work platform is constructed using a wooden block and a plywood, and has a length that is greater than 1.5 times the joint overlapping length of the conveyor belt, a width that is greater than the width of the conveyor belt, and an upper surface that is flush with an upper surface of the lower vulcanization plate.

4. The vulcanization joining method of a belt joint of a long-distance belt conveyor according to claim 1, wherein in step S3, the step of scribing the upper joint line and the terminal line of the belt joint is embodied as;

finding an A1 point from an end point C1 of a first side of a joint of the conveyer belt in a distance of 500-700 mm, drawing a perpendicular line from A1 point to a second side of the joint of the conveyer belt to find an A2 point, finding a B point from an A2 point along the second side towards the end head direction of the joint of the conveyer belt, wherein the distance between the A2 point and the B point is La, another end point C2 of an end head line is found from the B point along the second side, the A1B line is an upper joint line, and the C1C2 line is an end head line.

5. The method of claim 4 wherein La is related to the belt width of the belt and the slope of the vulcanizer;

la ═ 0.3 bandwidth of the belt when the slope of the vulcanizer was 16.7 °; when the slope of the vulcanizer is 20 °, La — the belt width of the conveyor belt is 0.364; when the slope of the vulcanizer was 22 °, La — belt width of the conveyor belt was 0.4.

6. The method for vulcanization joining a belt joint of a long-distance belt conveyor according to claim 1, further comprising a step of grinding the peeled wire rope core with a grinder before the step of partially removing the core rubber from the wire rope core in step S4.

7. The method for connecting a belt joint of a long-distance belt conveyor according to claim 1, wherein in step S6, the wire rope core is cleaned with gasoline.

8. The vulcanization joining method of a belt joint of a long-distance belt conveyor according to claim 1, wherein in step S7, the wire rope cores on the non-running direction side of the belt are arranged, the middle wire rope core of the joint of the two belts is found to be arranged as a starting line, and the wire ropes are arranged to both sides in sequence, respectively, so that the wire rope cores of the joint of the two belts are staggered in sequence.

Technical Field

The invention relates to the technical field of building construction, in particular to a vulcanization connection method for a conveyer belt joint of a long-distance belt conveyer.

Background

The steel wire rope core conveying belt has the advantages of high tensile strength, small elongation, bending fatigue resistance, excellent shock resistance, long service life and the like, is generally used for belt conveyors with high power, large transportation capacity and high belt speed, but has the characteristics of high cost, high laying difficulty, complex joint vulcanization process, long fault processing time and the like, and the quality of the joint vulcanization quality of the conveying belt directly influences the normal operation and the service life of the conveying belt, so that the vulcanization quality of the joint is ensured to be the important factor in the installation work of the conveying belt.

The long-distance belt conveyor has long conveying belt and more conveying belt joints, and the traditional joint vulcanization process is adopted, so that the vulcanization quality cannot be ensured, which is not expected by the technical personnel in the field.

Disclosure of Invention

In order to solve the existing problems, the invention discloses a vulcanization connection method for a conveyer belt joint of a long-distance belt conveyer, wherein the conveyer belt comprises a plurality of steel wire rope cores arranged side by side, an upper cover rubber arranged above the steel wire rope cores and a lower cover rubber arranged below the steel wire rope cores, core rubbers are arranged between the adjacent steel wire rope cores and between the upper cover rubber and the lower cover rubber, the method is applied to vulcanization connection of the joints of two conveyer belts, and the method comprises the following steps:

step S1, determining an operation area of the joint vulcanization connection of the two conveyer belts, and removing an upper supporting roller frame in the operation area;

step S2, arranging a lower vulcanizing plate of the vulcanizer at the operation area, and building a vulcanizing operation platform on the front side and the rear side of the lower vulcanizing plate;

step S3, respectively placing two conveyor belts on two vulcanization operation platforms, respectively cutting joints of the conveyor belts along end lines after marking central lines, upper joint lines, end head lines and lower joint lines of the joints of the two conveyor belts, wherein the distance between the upper joint lines and the end head lines is larger than the distance between the lower joint lines and the end head lines, and the distance between the upper joint lines and the end head lines is 500-700 mm; the distance between the upper joint line and the lower joint line is 20-40 mm;

step S4, after peeling the upper cover glue along the upper joint line, peeling the lower cover glue along the lower joint line, and partially removing the core glue on the steel wire rope core to ensure that the thickness of the core glue on the steel wire rope core is less than or equal to 0.5 mm;

step S5, placing two conveyer belt joints on a lower vulcanizing plate, and respectively fixing the two conveyer belts on two operation platforms after correcting the positions of the two conveyer belt joints by using the central line;

step S6, cleaning the steel wire rope core, coating a fluxing agent on the steel wire rope core, drying, and then installing a lower cover rubber component on the lower vulcanizing plate, wherein two ends of the lower cover rubber component are respectively matched with the notches of the lower cover rubber of the joints of the two conveying belts;

step S7, arranging the steel wire rope cores of the two conveying belt joints, and enabling the steel wire rope cores of the two conveying belt joints to be sequentially staggered;

step S8, mounting an upper cover rubber component on the steel wire rope core, wherein two ends of the upper cover rubber component are respectively matched with the notches of the upper cover rubber of the joints of the two conveying belts;

and step S9, installing a vulcanizer, and carrying out a joint vulcanization connection process of the two conveyer belts by using the vulcanizer.

In the vulcanization connecting method for a belt joint of a long-distance belt conveyor, in step S1, the distance between the working area and the tail roller is equal to the length of one belt.

In the step S2, the work platform is built by using battens and laminates, the length of the work platform is greater than 1.5 times of the overlapping length of the joint of the conveyor belt, the width of the work platform is greater than the width of the conveyor belt, and the upper surface of the work platform is flush with the upper surface of the lower vulcanizing plate.

In the vulcanization connection method for the conveyor belt joint of the long-distance belt conveyor, in step S3, the step of marking out the upper joint line and the end line of the conveyor belt joint is specifically;

finding an A1 point from an end point C1 of a first side of a joint of the conveyer belt in a distance of 500-700 mm, drawing a perpendicular line from A1 point to a second side of the joint of the conveyer belt to find an A2 point, finding a B point from an A2 point along the second side towards the end head direction of the joint of the conveyer belt, wherein the distance between the A2 point and the B point is La, another end point C2 of an end head line is found from the B point along the second side, the A1B line is an upper joint line, and the C1C2 line is an end head line.

The vulcanization connection method for the conveyor belt joint of the long-distance belt conveyor is characterized in that La is related to the belt width of the conveyor belt and the inclination of a vulcanizer;

la ═ 0.3 bandwidth of the belt when the slope of the vulcanizer was 16.7 °; when the slope of the vulcanizer is 20 °, La — the belt width of the conveyor belt is 0.364; when the slope of the vulcanizer was 22 °, La — belt width of the conveyor belt was 0.4.

In the vulcanization connection method for the conveyor belt joint of the long-distance belt conveyor, before the step of partially removing the core glue on the steel cord core in step S4, the method further includes a step of polishing the stripped steel cord core by using a polishing machine.

In the vulcanization connecting method for a conveyor belt joint of a long-distance belt conveyor, in step S6, the wire rope core is cleaned with gasoline.

In the step S7, the steel cord cores on the non-running direction side of the conveyor belt are arranged first, the middle steel cord core of the joint of the two conveyor belts is found out to be arranged as the starting line, and the steel cords are arranged to both sides in sequence, so that the steel cord cores of the joint of the two conveyor belts are staggered in sequence.

The invention has the following advantages or beneficial effects:

the invention discloses a vulcanization connection method for a conveyor belt joint of a long-distance belt conveyor, which is characterized in that after an operation area is determined, an upper supporting roller frame in the operation area is removed, a lower vulcanization plate is arranged in the operation area, an operation platform is installed, the center line, an upper joint line, an end line and a lower joint line of joints of two conveyor belts are marked on the operation platform, then the joints of the conveyor belts of the conveyor are cut along the end line, an upper cover rubber and a lower cover rubber are respectively stripped along the upper joint line and the lower joint line, part of core rubber is removed, then steps of installing a lower cover rubber assembly, arranging steel wire rope cores in a staggered mode and installing a lower cover rubber assembly are carried out, and then a vulcanizer is installed for carrying out joint vulcanization process Strong operability, good economical efficiency and strong applicability.

Drawings

The invention and its features, aspects and advantages will become more apparent from reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference symbols in the various drawings indicate like elements. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention.

FIG. 1 is a flow chart of a method for vulcanization joining a long reach belt conveyor belt joint in an embodiment of the present invention;

FIG. 2 is a schematic structural view of a joint vulcanization operation area of a conveyor belt according to an embodiment of the present invention;

FIG. 3 is a schematic structural view of a steel cord conveyor belt according to an embodiment of the present invention;

FIG. 4 is a schematic view of a scribe line structure of a joint according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a steel cord core trimmed to octagonal shape with core glue according to an embodiment of the present invention;

FIG. 6 is a schematic view of the position of a belt curing joint and a cured lower plate in an embodiment of the invention;

FIG. 7 is a top view of a conveyor belt after overlap of cured joints in an embodiment of the invention;

fig. 8 is a cross-sectional view of a conveyor belt after overlap of cured joints in an embodiment of the invention.

Detailed Description

The present invention will be further described with reference to the following drawings and specific examples, but the present invention is not limited thereto.

As shown in fig. 1 to 8, the invention discloses a vulcanization connection method for a conveyor belt joint of a long-distance belt conveyor, wherein the conveyor belt comprises a plurality of steel wire rope cores arranged side by side, an upper cover rubber arranged above the steel wire rope cores and a lower cover rubber arranged below the steel wire rope cores, core rubbers are arranged between the adjacent steel wire rope cores and between the steel wire rope cores and the upper cover rubber and between the steel wire rope cores and the lower cover rubber, the method is applied to vulcanization connection of joints 11 and 12 of two conveyor belts 1 and 2, and concretely comprises the following steps:

step S1, determining a working area for vulcanization connection of the joints 11 and 12 of the two conveyor belts 1 and 2, and removing the upper supporting roller frame in the working area, wherein the removed length is greater than the length of the two work tables plus the vulcanizer.

Specifically, the belt of the long-distance belt conveyor is generally composed of a plurality of belts (e.g., belt 1, belt 2, and belt 3), and thus there are a plurality of locations that can be used as work points, and in combination with the situation of the field, a specific work point (i.e., work area) is located at about one belt length from the tail drum 5, so that the reel-feeding device 4 is left free after one belt segment is put on the shelf, so that a new belt reel can be installed while vulcanization is performed, as shown in the structure shown in fig. 2

Step S2, arranging a lower vulcanizing plate 6 of the vulcanizer at an operation area, and building a vulcanizing operation platform 7 on the front side and the rear side of the lower vulcanizing plate 6, wherein the structure is shown in FIG. 2;

specifically, the work platform mainly comprises 50x50mm battens and 18mm thick laminates. The working platform should have sufficient length, the length of the working platform is greater than or equal to 1.5 times of the joint overlapping length of the conveying belt, the width of the working platform 7 is greater than or equal to the width of the conveying belt, and the upper surface of the working platform 7 is flush with the upper surface of the lower vulcanizing plate 6.

Two work platforms 7 should set up respectively in the dead ahead of vulcanizing board 6 under and dead behind, simultaneously, work platform 6 should can fix on the conveying tape unit to fix the sticky tape, in order to guarantee that the joint position can not slide the dislocation.

In addition, it is often necessary to adjust the tension wheel to minimize the inner circumference, considering that a portion of the belt length is released after vulcanization is complete and the belt tensioner loosens. For wire rope core belts, the amount of tension should be between 0.1% and 0.3% of the center-to-center distance.

Step S3, respectively placing the two conveyor belts 1 and 2 on two vulcanization operation platforms, cutting the joints of the conveyor belts along the end lines after marking the central lines, the upper joint lines, the end line and the lower joint lines of the joints 11 and 12 of the two conveyor belts, wherein the distance between the upper joint lines and the end line is larger than the distance between the lower joint lines and the end line, and the distance between the upper joint lines and the end line is 500-700 mm; the distance between the upper joint line and the lower joint line is 20-40 mm.

Specifically, as shown in FIG. 3, the center lines of the two belt joints are first drawn. Finding three bandwidth central points with the mutual distance larger than 1 meter, checking whether the bandwidth central points are connected into a straight line or not, marking a central line by using a pen if the bandwidth central points can be connected into a straight line, and finding the central points again until the bandwidth central points can be connected into a straight line if the bandwidth central points can not be connected into a straight line; next, the top tab line, the end tab line, and the bottom tab line of the tab are scribed. Finding an A1 point from the distance of 500-700 mm (ls) from the end point C1 of the first side of the joint of the conveyor belt, finding an A2 point from the A1 point to the second side of the joint of the conveyor belt, finding a B point from the A2 point along the second side towards the end head direction of the joint of the conveyor belt, wherein the distance between the A2 point and the B point is La, finding the other end point C2 of the end head line from the B point along the second side, taking the A1B line as an upper joint line and the C1C2 line as an end head line, finding two points of a lower joint line from the A1 point and the B point to the direction of 30mm of the end head of the joint of the conveyor belt below the joint, and connecting the two points to form a lower joint line.

Specifically, the specific value of La is related to the belt width of the conveyor belt and the slope of the vulcanizer;

la ═ 0.3 bandwidth of the belt when the slope of the vulcanizer was 16.7 °; when the slope of the vulcanizer is 20 °, La — the belt width of the conveyor belt is 0.364; when the slope of the vulcanizer is 22 °, La — belt width of the conveyor belt is 0.4; in the present embodiment, the slope of the vulcanizer is 20 °, so La is the belt width of the conveyor belt 0.364, and in the present embodiment, the belt width of the conveyor belt is B.

And step S4, after the upper cover rubber is peeled along the upper joint line, the lower cover rubber is peeled along the lower joint line, and the core rubber on the steel wire rope core is partially removed so that the thickness of the core rubber on the steel wire rope core is less than or equal to 0.5 mm.

Specifically, first, a suitable wood or iron plate is placed under the conveyor belt joint to prevent damage to the lower plate of the vulcanizer when the joint is cut. Next, the cover glue is peeled off according to the upper joint line and the lower joint shown in FIG. 3. The cover rubber is peeled off from the point A1, the cover rubber layer of the cover rubber is cut, the cover rubber is clamped by a clamp and then is pulled by a drawing tool, and then the cover rubber is slowly peeled off. Then the joint of the conveyer belt is turned over, and the lower cover rubber is peeled off according to the same method. And then the conveyer belt with the cover rubber stripped is put back to the workbench to be flat, and the stripped steel wire rope is polished once by a polishing machine. And stripping the steel wire rope and the core rubber by using a cutter, wherein two sides of the steel wire rope are tightly attached to the steel wire rope until the joint is completely split, and the core rubber is cut off. It should be noted that the steel wire rope is prohibited from being scratched, but the thickness of the cover rubber protective layer cannot exceed 0.5mm, and the rubber attached to the steel wire rope is trimmed into an octagonal shape as shown in fig. 4.

Step S5, placing the two belt joints 11 and 12 on the lower vulcanizing plate 7, and fixing the two belts on the two work platforms respectively after correcting the positions of the two belt joints by using the center line, as shown in fig. 5 and 6, where 8 is the lap joint area; wherein Lv is the lap joint length, and according to the technical specification of a supplier, the St1600 type conveying belt is 800 mm; lu is the length of the manufactured joint; in the figure, the length of the lower vulcanization plate is about 300mm greater than the length of the overlapping area 8 of the two belt splices 11 and 12, and the width of the lower vulcanization plate is about 200mm greater than the width of the overlapping area 8 of the two belt splices 11 and 12.

Specifically, the step S5 includes: firstly, the joints of the two conveyer belts are placed on the lower vulcanizing plate 6, the centers of the joints are equal to the center of the lower vulcanizing plate 6 in the length and width directions, secondly, the ends of the two conveyer belts are adjusted, and after the two ends of the joints are accurately corrected according to the central line, the conveyer belts are fixed on the operation platform by using clamping plates.

Step S6, cleaning the steel wire rope core, coating a fluxing agent on the steel wire rope core, drying, and installing a lower cover rubber component 82 on the lower vulcanizing plate 6, wherein two ends of the lower cover rubber component 82 are respectively matched with the notches of the lower cover rubber of the joints of the two conveying belts.

Specifically, step S6 includes: the wire rope core was cleaned with 120# gasoline, gummed up (fluxing agent) as required and thoroughly dried. The steel wire rope core is separated at the center line and is respectively wrapped by two films. Then cutting the lower cover rubber component 82 according to the lower joint line, drawing a marking line parallel to the notch at the position 20mm away from the notch, cutting the core rubber completely along the marking line and removing the core rubber, enabling the two ends of the lower cover rubber component 82 to be respectively matched with the notches of the lower cover rubber of the joints of the two conveyer belts, then installing the lower cover rubber component 82 on the lower vulcanizing plate 6, and enabling the joints of the two conveyer belts to be ensured to be jointed after being put down.

Step S7, the wire rope cores 83 of the two belt splices are arranged such that the wire rope cores of the two belt splices are staggered in sequence, as in the configuration shown in fig. 7.

Specifically, firstly arranging steel wire rope cores on the non-running direction sides of the conveyer belts, finding out a middle steel wire rope core of joints of the two conveyer belts as a starting line to be arranged, and sequentially and respectively arranging the rest steel wire ropes towards the two sides, specifically, firstly arranging a middle steel wire rope core of the joint 21 of the conveyer belt 2, then arranging a middle steel wire rope core of the joint 11 of the conveyer belt 1, then arranging a first steel wire rope core of the joint 21 of the conveyer belt 2, which is positioned on the left side of the middle steel wire rope core, and then arranging a first steel wire rope core of the joint 11 of the conveyer belt 1, which is positioned on the left side of the middle steel wire rope core; then arranging a first steel wire rope core of the joint 21 of the conveying belt 2, which is positioned at the right side of the middle steel wire rope core, and then arranging a first steel wire rope core of the joint 11 of the conveying belt 1, which is positioned at the right side of the middle steel wire rope core; then the second steel wire rope core on the left side of the middle steel wire rope core of the joint 21 of the conveying belt 2 is arranged, the second steel wire rope core on the left side of the middle steel wire rope core of the joint 11 of the conveying belt 1 is arranged, and the like, so that the steel wire rope cores of the joints of the two conveying belts are arranged in a staggered mode in sequence. And every 4 to 5 pieces are arranged, checking the neatness degree and making needed adjustment according to the situation.

In step S8, the upper glue assembly 81 is mounted on the wire rope core 83, and both ends of the upper glue assembly are respectively engaged with the notches of the upper glue at the joint of the two conveyer belts, please refer to the specific mounting step of the lower glue assembly in step S7, which is not repeated here! The structure shown in fig. 8 is formed.

And step S9, installing a vulcanizer, and carrying out a joint vulcanization connection process of the two conveyer belts by using the vulcanizer.

Specifically, the vulcanization process comprises the following specific steps: and (5) pressing. And (3) pressurizing to 8bar at normal temperature, pressurizing to 12bar after the temperature is raised to 100 ℃, and maintaining the pressure until the vulcanization cooling is finished. And (6) electrifying. After the pressure reached 8bar, the vulcanizer was energized and the temperature was raised. When the temperature reaches 145 ℃, the heat preservation timing is started. And (6) opening the mold. When the temperature of the vulcanizer is reduced to 60 ℃, releasing the pressure, removing the vulcanizer and checking the quality of the joint.

Those skilled in the art will appreciate that variations may be implemented by those skilled in the art in combination with the prior art and the above-described embodiments, and will not be described herein in detail. Such variations do not affect the essence of the present invention and are not described herein.

The above description is of the preferred embodiment of the invention. It is to be understood that the invention is not limited to the particular embodiments described above, in that devices and structures not described in detail are understood to be implemented in a manner common in the art; those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or modify equivalent embodiments to equivalent variations, without departing from the spirit of the invention, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.