阅读说明：本技术 一种不锈钢真空器皿防护识别检测装置及检测方法 (Stainless steel vacuum vessel protection identification detection device and detection method ) 是由 吕峥健 陈祯力 于 2021-09-06 设计创作，主要内容包括：一种不锈钢真空器皿防护识别检测装置及检测方法,属于不锈钢真空器皿检测装置。检测筒(2)为一端敞口的圆筒,检测筒(2)安装在输送装置上,检测筒(2)沿输送装置间隔设置有若干个,检测筒(2)内设置有用于加热的加热部,检测筒(2)内或顶部设置有检测部,剔除装置设置在输送装置的输出端的一侧,复检装置安装在剔除装置上。本不锈钢真空器皿防护识别检测装置能够在待检测器皿在输送过程中完成检测,检测速度快,且检测方便,复检装置能够在不锈钢器皿的剔除过程中实现对待检测器皿的复检,保证对待检测器皿的检测更加准确；本检测方法消除了环境因素带来的影响,且能够判断漏气位置,以对不合格的待检测器皿进行修复。(A stainless steel vacuum vessel protection identification detection device and a detection method belong to stainless steel vacuum vessel detection devices. The detection cylinder (2) is a cylinder with an open end, the detection cylinder (2) is installed on the conveying device, the detection cylinder (2) is provided with a plurality of parts at intervals along the conveying device, a heating part for heating is arranged in the detection cylinder (2), a detection part is arranged in the detection cylinder (2) or at the top of the detection cylinder, the rejecting device is arranged on one side of the output end of the conveying device, and the rechecking device is installed on the rejecting device. The stainless steel vacuum vessel protection, identification and detection device can finish detection in the conveying process of a vessel to be detected, has high detection speed and convenient detection, and can realize rechecking of the vessel to be detected in the removing process of the stainless steel vessel, thereby ensuring that the detection of the vessel to be detected is more accurate; the detection method eliminates the influence caused by environmental factors, and can judge the air leakage position so as to repair unqualified vessels to be detected.)

1. The utility model provides a stainless steel vacuum vessel protection discernment detection device which characterized in that: including conveyor, detection section of thick bamboo (2), removing devices and reinspection device, detection section of thick bamboo (2) are the open drum in one end, and detection section of thick bamboo (2) are installed on conveyor, and detection section of thick bamboo (2) are provided with a plurality of along conveyor interval, are provided with the heating portion that is used for the heating in the detection section of thick bamboo (2), and detection section is provided with at detection section of thick bamboo (2) or top, and removing devices sets up the one side at conveyor's output, and the reinspection device is installed on removing devices.

2. The stainless steel vacuum vessel protection, identification and detection device of claim 1, wherein: the detection barrel (2) comprises an inner barrel (14), an outer barrel (13) and a pressure sensor (17), the inner barrel (14) is arranged in the outer barrel (13), the outer wall of the inner barrel (14) and the inner wall of the outer barrel (13) are arranged at intervals, a jacket (15) is formed between the inner barrel (14) and the outer barrel (13), a plurality of air injection holes (16) are formed in the inner barrel (14), the jacket (15) is communicated with the inner cavity of the inner barrel (14) through the air injection holes (16), a steam inlet (1301) communicated with the jacket (15) is formed in the outer barrel (13), the heating part is formed, and the pressure sensor (17) is installed at the bottom of the inner barrel (14) to form the detection part.

3. The stainless steel vacuum vessel protection, identification and detection device of claim 1, wherein: the inner wall of the detection barrel (2) is provided with a heating layer (18) to form the heating part, and the top of the detection barrel (2) is provided with a detection element to form the detection part.

4. The stainless steel vacuum vessel protection, identification and detection device of claim 3, wherein: the heating layer (18) is an electric heating tube or a carbon crystal electric heating plate arranged around the inner wall of the detection cylinder (2).

5. The stainless steel vacuum vessel protection, identification and detection device of claim 1, wherein: the removing device comprises a swing arm (4), a swing motor, a clamping cylinder (6) and a clamp (7), wherein the swing arm (4) is higher than the detection cylinder (2), the swing motor is connected with the swing arm (4) and drives the swing arm to swing towards the direction close to or away from the detection cylinder (2), the clamp (7) is installed on the swing arm (4), and the clamping cylinder (6) is connected with the clamp (7) and drives the clamp to move.

6. The stainless steel vacuum vessel protection, identification and detection device of claim 5, wherein: anchor clamps (7) including splint (701) and supporting pad (702), splint (701) are provided with two side by side and the interval, the one end and the die clamping cylinder (6) of splint (701) link to each other to along with its synchronous oscillation, the other end is provided with the curved clamping part of middle part indent, supporting pad (702) are installed on clamping part, and equal interval is provided with a plurality of supporting pad (702) on each clamping part.

7. The stainless steel vacuum vessel protection, identification and detection device of claim 1, wherein: the rechecking device comprises a heating rod (10) and a thermal imager (12), wherein the heating rod (10) is vertically arranged and installed on the removing device, and the thermal imager (12) is arranged on one side of the heating rod (10) at intervals.

8. The stainless steel vacuum vessel protection, identification and detection device of claim 7, wherein: the thermal imaging system (12) is provided with two thermal imaging systems which are respectively opposite to the two ends of the heating rod (10).

9. The detection method of the stainless steel vacuum vessel protection, identification and detection device of any one of claims 1 to 8, characterized in that: the method comprises the following steps:

step 1) putting the vessels to be detected into a detection cylinder (2), and putting dry ice with equal weight into each vessel to be detected;

step 2), the heating part of the detection barrel (2) heats the outside of the utensil to be detected, meanwhile, the detection part detects the dry ice in the utensil to be detected, and the time for the dry ice in each utensil to be detected to sublimate completely is compared;

step 3), the removing device removes the to-be-detected ware with the time difference exceeding a set numerical value out of the detection barrel (2), wherein the time for the dry ice to be completely sublimated is short;

and 4) heating the inner wall of the vessel to be detected by the rechecking device, detecting whether the air leakage exists at the welding seam of the vessel to be detected, if so, determining that the vessel to be detected is unqualified, and if not, determining that the vessel to be detected is qualified.

10. The detection method according to claim 9, characterized in that: detecting the dry ice in the utensil to be detected in the step 2) by measuring the weight of the utensil to be detected, or detecting the concentration of carbon dioxide in the utensil to be detected, or detecting the fog at the opening of the utensil to be detected.

Technical Field

A stainless steel vacuum vessel protection identification detection device and a detection method belong to stainless steel vacuum vessel detection devices.

Background

The stainless steel vacuum container is generally formed by welding two layers of stainless steel cylinders, and the middle of the stainless steel vacuum container is vacuumized to weaken heat transfer between the inside and the outside of the container, so that the heat preservation performance of the container is improved. After the stainless steel vacuum container is welded, the heat conductivity of the stainless steel vacuum container needs to be detected, the inner wall of the stainless steel vacuum container is heated through steam in the detection method adopted at present, the temperature of the outer wall of the stainless steel vacuum container is detected in a hand touch mode, the detection method is low in accuracy and only capable of detecting one by one, the detection speed is low, the production efficiency of the stainless steel vacuum container is affected, and in addition, due to the fact that the stainless steel vacuum container is heated through the steam in the detection method, the heating energy consumption of the stainless steel vacuum container is high, and the production cost of the stainless steel vacuum container is high.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the device and the method for detecting the protection of the stainless steel vacuum vessel overcome the defects of the prior art, are convenient to detect the vessel to be detected, are high in detection speed and are accurate in detection.

The technical scheme adopted by the invention for solving the technical problems is as follows: this stainless steel vacuum vessel protection discernment detection device, its characterized in that: the detection cylinder is a cylinder with an open end and is installed on the conveying device, a plurality of detection cylinders are arranged at intervals along the conveying device, heating portions used for heating are arranged in the detection cylinders, detection portions are arranged in the detection cylinders or at the top of the detection cylinders, the removing device is arranged on one side of the output end of the conveying device, and the rechecking device is installed on the removing device.

Preferably, the detection cylinder comprises an inner cylinder, an outer cylinder and a pressure sensor, the inner cylinder is arranged in the outer cylinder, the outer wall of the inner cylinder and the inner wall of the outer cylinder are arranged at intervals, a jacket is formed between the inner cylinder and the outer cylinder, a plurality of air injection holes are formed in the inner cylinder and are used for communicating the jacket with the inner cavity of the inner cylinder, a steam inlet communicated with the jacket is formed in the outer cylinder to form the heating part, and the pressure sensor is arranged at the bottom of the inner cylinder to form the detection part. The pressure sensor can detect the weight of the utensil to be detected, after the dry ice is put into the utensil to be detected, the weight of the utensil to be detected is gradually reduced due to sublimation of the dry ice, when the weight of the utensil to be detected is not changed any more, the dry ice can be determined to be completely sublimated, the detection is convenient, and errors caused by different weights of the utensil to be detected can be eliminated; steam is introduced into the jacket, so that the vessel to be detected in the inner cylinder can be heated uniformly, and the heating speed is high.

Preferably, the inner wall of the detection cylinder is provided with a heating layer to form the heating part, and the top of the detection cylinder is provided with a detection element to form the detection part. The detection part is arranged at the top of the detection barrel, and whether the dry ice is completely sublimated can be judged by detecting the concentration of carbon dioxide or mist at the top of the detection barrel.

Preferably, the heating layer is an electric heating tube or a carbon crystal electric heating plate arranged around the inner wall of the detection cylinder.

Preferably, the removing device comprises a swing arm, a swing motor, a clamping cylinder and a clamp, wherein the swing arm is higher than the detection cylinder, the swing motor is connected with the swing arm and drives the swing motor to swing towards the direction close to or away from the detection cylinder, the clamp is arranged on the swing arm, and the clamping cylinder is connected with the clamp and drives the clamp to move. The swing motor drives the swing arm to swing, and the clamping cylinder drives the clamp to move, so that unqualified utensils are removed, and the removal is convenient.

Preferably, anchor clamps include splint and supporting pad, splint are provided with two side by side and interval, the one end and the die clamping cylinder of splint link to each other to along with its synchronous oscillation, the other end is provided with the curved clamping part of middle part indent, the supporting pad is installed on clamping part, and all intervals are provided with a plurality of supporting pad on each clamping part. All install a plurality of supporting pads on each clamping part, can enough guarantee to treat that the detector ware presss from both sides tightly reliably, can avoid treating the detector ware outer wall again and cause the damage.

Preferably, the rechecking device comprises a heating rod and a thermal imager, the heating rod is vertically arranged and installed on the removing device, and the thermal imager is arranged on one side of the heating rod at intervals.

Preferably, the thermal imaging system has two thermal imaging systems respectively opposite to two ends of the heating rod.

The detection method of the stainless steel vacuum vessel protection, identification and detection device is characterized in that: the method comprises the following steps:

step 1) putting the vessels to be detected into a detection cylinder, and adding dry ice with equal weight into each vessel to be detected;

step 2), the heating part of the detection barrel heats the outside of the utensil to be detected, meanwhile, the detection part detects the dry ice in the utensil to be detected, and the time for the dry ice in each utensil to be detected to sublimate completely is compared;

step 3), the removing device is used for removing the to-be-detected utensil with the time difference exceeding a set numerical value out of the detection barrel, wherein the time for completely sublimating the dry ice is short;

and 4) heating the inner wall of the vessel to be detected by the rechecking device, detecting whether the air leakage exists at the welding seam of the vessel to be detected, if so, determining that the vessel to be detected is unqualified, and if not, determining that the vessel to be detected is qualified.

Preferably, the dry ice in the vessel to be detected in the step 2) is detected by measuring the weight of the vessel to be detected, or detecting the concentration of carbon dioxide in the vessel to be detected, or detecting mist at the mouth of the vessel to be detected.

Compared with the prior art, the invention has the beneficial effects that:

the conveying device of the stainless steel vacuum vessel protection, identification and detection device is provided with the detection cylinders, detection of vessels to be detected in the conveying process can be completed through the detection cylinders, the detection speed is high, the detection is convenient, the rejection device can reject vessels to be detected, which are detected by the rejection device unqualified detection cylinders, the rechecking device can realize rechecking of vessels to be detected in the rejection process of stainless steel vessels, and the detection of vessels to be detected is guaranteed to be more accurate.

The detection method comprises the steps of putting dry ice into a vessel to be detected, heating the vessel to be detected, detecting the thermal conductivity of the vessel to be detected by detecting the sublimation time of the dry ice, wherein the heating temperature outside the vessel to be detected is not required to be high so as to meet the detection requirement, energy consumed by heating the vessel to be detected is greatly reduced, the detection cost is reduced, the operation is convenient during detection, the influence caused by environmental factors is eliminated by comparing the time consumed by completely sublimating the dry ice in each vessel to be detected, the detection result is ensured to be more accurate, a re-detection device continues to heat the interior of the vessel to be detected, if the vessel to be detected is unqualified, gas between two layers of stainless steel is heated and expands and can be discharged through a leakage position, the temperature of the discharged gas is higher than the external environment temperature, and whether the gas leaks can be judged by detecting the temperature outside a welding line, the rechecking device can judge the air leakage position so as to conveniently repair unqualified utensils to be detected, and the problem that the existing unqualified products can only be subjected to waste treatment is solved.

Drawings

Fig. 1 is a schematic front view of a stainless steel vacuum vessel protection, identification and detection device.

Fig. 2 is a partially enlarged view of a portion a in fig. 1.

Fig. 3 is a schematic top view of the clamp.

Fig. 4 is a schematic front sectional view of the cartridge in embodiment 1.

Fig. 5 is a schematic front sectional view of the cartridge in embodiment 2.

In the figure: 1. the device comprises a conveying chain 2, a detection cylinder 3, a stand column 4, a swing arm 5, a lifting frame 6, a clamping cylinder 7, a clamp 701, a clamping plate 702, a supporting pad 8, a mesh enclosure 9, a rotary table 10, a heating rod 11, an installation rod 12, a thermal imager 13, an outer cylinder 1301, a steam inlet 14, an inner cylinder 15, a jacket 16, an air injection hole 17, a pressure sensor 18 and a heating layer.

Detailed Description

Fig. 1 to 4 are preferred embodiments of the present invention, and the present invention will be further described with reference to fig. 1 to 5.

The utility model provides a stainless steel vacuum household utensils protection discernment detection device, includes conveyor, detection cylinder 2, removing devices and rechecking device, and detection cylinder 2 is the open drum in one end, and detection cylinder 2 installs on conveyor, and detection cylinder 2 is provided with a plurality of along the conveyor interval, is provided with the heating portion that is used for the heating in the detection cylinder 2, and detection cylinder 2 is interior or the top is provided with the detection portion, and removing devices sets up in one side of conveyor's output, and the rechecking device is installed on removing devices. This stainless steel vacuum household utensils protection discernment detection device's conveyor is last to be provided with a plurality of detection section of thick bamboo 2, can detect the household utensils completion in transportation process through detection section of thick bamboo 2, and it is fast to detect, and it is convenient to detect, and removing devices can detect unqualified household utensils rejection that waits with detection section of thick bamboo 2, and the reinspection device can realize the reinspection to waiting to detect the household utensils at the rejection in-process of stainless steel household utensils, guarantees to wait to detect the detection of household utensils more accurate.

The present invention is further described with reference to the following detailed description, however, it should be understood by those skilled in the art that the detailed description given herein with respect to the accompanying drawings is for better explanation and that the present invention is not necessarily limited to the specific embodiments, but rather, for equivalent alternatives or common approaches, may be omitted from the detailed description, while still remaining within the scope of the present application.

Example 1

As shown in FIGS. 1 to 3: conveyor is for carrying chain 1, and conveyor still can be for conveyor belt, detects a section of thick bamboo 2 and is the open drum in one end, detects a section of thick bamboo 2 and installs on carrying chain 1, and detects a section of thick bamboo 2 perpendicular to carrying chain 1's direction of delivery setting, detects the outside of an opening end orientation carrying chain 1 of a section of thick bamboo 2.

The removing devices are installed on one side of the output end of the conveying chain 1 and comprise a stand column 3, a swing arm 4, a swing motor (not shown in the drawing), a clamping cylinder 6 and a clamp 7, the stand column 3 is vertically arranged, the swing arm 4 is horizontally arranged on the upper side of the stand column 3, the swing arm 4 is higher than the detection cylinder 2, one end of the swing arm 4 is rotatably installed on the top of the stand column 3, the other end of the swing arm 4 is a free end, the swing motor is arranged on the stand column 3, and an output shaft of the swing motor is connected with the swing arm 4 and drives the swing motor to swing. The clamping cylinder 6 is arranged at the free end of the swing arm 4, and a piston rod of the clamping cylinder 6 is connected with the clamp 7 to drive the clamp 7 to clamp or loosen.

The removing device also comprises a lifting device and a rotating device, the lifting device is arranged on the swing arm 4, the rotating device is arranged on the lifting device and lifts along with the lifting device, and the clamping cylinder 6 is arranged on the rotating device and synchronously rotates along with the rotating device.

The lifting device comprises a lifting cylinder (not shown in the figure) and a lifting frame 5, the lifting cylinder is installed on the swing arm 4, the lifting cylinder is vertically arranged, a piston rod of the lifting cylinder is connected with the lifting frame 5, and the lifting frame 5 is driven to lift.

The rotating device comprises a rotating motor (not shown in the figure) and a rotating disc 9, the rotating disc 9 is rotatably arranged on the lifting frame 5, the rotating motor is arranged on the lifting frame 5, an output shaft of the rotating motor is connected with the rotating disc 9 and drives the rotating disc 9 to synchronously rotate, and the clamping cylinder 6 is arranged on one side of the rotating disc 9, so that the central line of the clamp 7 is coincided with the rotating shaft of the rotating disc 9.

The clamp 7 comprises a clamp plate 701 and a supporting pad 702, the clamp plate 701 comprises two clamp plates 701 arranged side by side and arranged at intervals, the two clamp plates 701 are connected with the clamping cylinder 6 and synchronously swing along with the clamping cylinder 6 in opposite directions, so that the two clamp plates 701 are matched with each other to clamp the vessel to be detected. One end of the clamping plate 701, which is far away from the clamping cylinder 6, is provided with an arc-shaped clamping portion with an inward concave middle portion, the two clamping portions are encircled into a circle coaxial with the vessel to be detected, the inner sides of the clamping portions are respectively provided with a supporting pad 702, the supporting pad 702 is a flexible pad, and the clamping portions are respectively provided with a plurality of supporting pads 702 side by side and at intervals. The supporting pad 702 can not only ensure reliable clamping of the utensil to be detected, but also avoid damage to the utensil to be detected.

The rechecking device comprises a heating rod 10 and a thermal imaging camera 12, wherein the heating rod 10 is vertically installed on the lower side of the turntable 9, and the lower end of the heating rod 10 penetrates through the middle part of the clamp 7 and extends downwards. The bottom of the heating rod 10 is provided with an electric heating tube, the electric heating tube is connected with an external power supply through a slip ring and a lead, the outer wall of the heating rod 10 is provided with a mesh enclosure 8, and the mesh enclosure 8 can prevent the inner wall of a utensil to be detected from contacting with the electric heating tube. Thermal imaging system 12 is installed on swing arm 4 through installation pole 11, and the vertical setting of installation pole 11, the upper end of installation pole 11 is installed on swing arm 4, and installation pole 11 sets up in one side of carousel 9, and thermal imaging system 12 is installed on installation pole 11, and thermal imaging system 12 has respectively with 10 both ends of heating rod just right two, can treat the welding seam department at detector ware both ends respectively and detect.

As shown in fig. 4: the detection cylinder 2 comprises an outer cylinder 13, an inner cylinder 14 and a pressure sensor 17, wherein the inner cylinder 14 is coaxially arranged in the outer cylinder 13, the outer wall of the inner cylinder 14 and the inner wall of the outer cylinder 13 are arranged at intervals, the top of the outer cylinder 13 is hermetically connected with the top of the inner cylinder 14, a jacket 15 is formed between the outer cylinder 13 and the inner cylinder 14, and a steam inlet 1301 communicated with the jacket 15 is arranged at the bottom of the outer cylinder 13. The inner cylinder 14 is provided with an air injection hole 16 for communicating the jacket 15 with the inner cylinder 14, and the vessel to be detected in the inner cylinder 14 can be heated uniformly through the air injection hole 16. The pressure sensor 17 is coaxially arranged at the bottom of the inner cylinder 14, and the weight of the vessel to be detected can be detected through the pressure sensor 17. In this embodiment, the vessel to be tested is a stainless steel vacuum vessel.

The detection method of the stainless steel vacuum vessel protection, identification and detection device comprises the following steps:

step 1) putting the vessels to be detected into a detection cylinder 2, and putting dry ice with equal weight into each vessel to be detected.

And putting the stainless steel vacuum container to be detected into the detection barrel 2, wherein the top of the stainless steel vacuum container extends out of the detection barrel 2 so as to be convenient for clamping the removing device, and simultaneously putting dry ice with equal weight into the inner barrel of each stainless steel vacuum container.

And step 2) the heating part of the detection barrel 2 heats the outside of the utensil to be detected, meanwhile, the detection part detects the dry ice in the utensil to be detected, and the time for the dry ice in each utensil to be detected to sublimate completely is compared.

Steam is introduced into the jacket 15 through the steam inlet 1301, the steam in the jacket 15 enters the inner cylinder 14 through the air injection holes 16, and the stainless steel vacuum containers in the inner cylinder 14 are heated, and the heating temperature of the stainless steel vacuum containers can be guaranteed to be the same due to the fact that the steam is at the same temperature.

Detect each stainless steel vacuum container's weight through pressure sensor 17, because the dry ice takes place to sublimate, stainless steel vacuum container's weight reduces gradually, and when stainless steel vacuum container's weight no longer reduces, think that the dry ice sublimates completely promptly, the time that stainless steel vacuum container weight no longer changes is the time that the dry ice sublimation was accomplished. And calculating the time required by the dry ice of each stainless steel vacuum container to be completely sublimated, and comparing the time required by the dry ice in each stainless steel vacuum container to be completely sublimated.

The stainless steel vacuum container can be heated through a tunnel kiln, and the outside of the stainless steel vacuum container is also heated in the tunnel kiln in an illumination mode.

And 3) the removing device is used for removing the to-be-detected ware with the time difference exceeding a set numerical value out of the detection barrel 2, wherein the time for completely sublimating the dry ice is short.

When the short time for completely sublimating the dry ice in a certain stainless steel vacuum container is detected and the time difference exceeds a set value, the heat preservation performance of the stainless steel vacuum container is considered to be poor, and the unqualified stainless steel vacuum container is removed by the removing device.

And 4) heating the inner wall of the vessel to be detected by the rechecking device, detecting whether the air leakage exists at the welding seam of the vessel to be detected, if so, determining that the vessel to be detected is unqualified, and if not, determining that the vessel to be detected is qualified.

When the stainless steel vacuum container is removed by the removing device, the clamp 7 clamps the upper part of the stainless steel vacuum container, the heating rod 10 extends into the stainless steel vacuum container and heats the inner wall of the stainless steel vacuum container, and the heating temperature is higher than that of the detection barrel 2 for heating the stainless steel vacuum container. If the stainless steel vacuum container is unqualified, gas can exist between two layers of stainless steel, the gas escapes during heating, the temperature of the escaped gas is higher than that of the outside air, the turntable 9 drives the stainless steel vacuum container to rotate through the clamp 7, the two thermal imaging cameras 12 simultaneously detect welding seams at the upper end and the lower end of the stainless steel vacuum container, whether gas leakage exists or not is judged through temperature detection, the stainless steel vacuum container is unqualified when gas leakage exists, the gas leakage position can be accurately detected, namely, the position of the unqualified welding position is welded, and the welding seam can be repaired at the moment. And when the stainless steel vacuum container is detected to be airtight, the stainless steel vacuum container is qualified.

Example 2

As shown in fig. 5: example 2 differs from example 1 in that: the detection cylinder 2 is a cylinder with an upward opening, the detection cylinder 2 is not provided with a jacket, a heating layer 18 is arranged around the inner wall of the detection cylinder 2, and the heating layer 18 is an electric heating tube or a carbon crystal electric heating plate arranged around the inner wall of the detection cylinder 2. The top of the detection barrel 2 is provided with a detection part which is a correlation photoelectric sensor or a carbon dioxide concentration sensor, the correlation sensor judges whether the dry ice is completely sublimated by detecting the fog at the opening of the stainless steel vacuum container, and the carbon dioxide concentration sensor judges whether the dry ice in the stainless steel vacuum container is completely sublimated by detecting the carbon dioxide concentration at the opening of the stainless steel vacuum container.

The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.