阅读说明：本技术 一种仓顶式脉冲反吹除尘器 (Storehouse top formula pulse blowback dust remover ) 是由 李亮亮 宫宏 孙立富 陶彬 王世强 孟鹤 刘全桢 刘静如 于 2020-05-28 设计创作，主要内容包括：本发明提供了一种仓顶式脉冲反吹除尘器,包括外壳、过滤室、净气室、安防系统、清灰系统；外壳结构中,除尘器筒体上下两端通过顶部、底部大法兰与封头、料仓相连接,筒体内部通过花孔板将过滤粉尘的过滤室和储存气体的净气室隔开；安防系统包括爆破片组件和差压变送器,设置于筒体底部,用于防止设备爆裂及监控差压；清灰系统包括脉冲控制箱、气包、脉冲阀、滤袋、喷吹管,脉冲控制箱与气包位于筒体两侧,滤袋、气包通过喷吹管连接,喷吹管上设置有脉冲阀,利用脉冲控制箱控制脉冲阀将压缩气体送入滤袋中进行清灰。本发明还提供了一种仓顶式脉冲反吹除尘器的除尘方法和清灰方法,解决了有限作业空间中的气体除尘,实现了除尘后粉状物料的回收。(The invention provides a storehouse top type pulse back-blowing dust remover which comprises a shell, a filter chamber, an air purifying chamber, a security system and an ash removal system, wherein the filter chamber is arranged in the shell; in the shell structure, the upper end and the lower end of a dust remover cylinder are connected with an end enclosure and a storage bin through large flanges at the top and the bottom, and a filtering chamber for filtering dust and a gas purifying chamber for storing gas are separated from each other through a perforated plate in the cylinder; the security system comprises a blasting sheet assembly and a differential pressure transmitter, is arranged at the bottom of the cylinder and is used for preventing equipment from bursting and monitoring differential pressure; the ash removal system comprises a pulse control box, an air bag, a pulse valve, a filter bag and an injection tube, wherein the pulse control box and the air bag are located on two sides of the barrel, the filter bag and the air bag are connected through the injection tube, the injection tube is provided with the pulse valve, and the pulse control box is used for controlling the pulse valve to send compressed gas into the filter bag for ash removal. The invention also provides a dust removal method and an ash removal method of the bin-top type pulse back-blowing dust remover, which solve the problem of gas dust removal in a limited operation space and realize the recovery of the powder materials after dust removal.)

1. A bin top type pulse back-blowing dust remover is characterized by comprising a shell, a filter chamber, an air purifying chamber, a security system and an ash removal system;

the shell comprises a bottom large flange (1), a cylinder body (15), a perforated plate (6), a top large flange (7), an end enclosure (8) and a hanging column (9), wherein the cylinder body (15) is arranged between the top large flange (7) and the bottom large flange (1) and is of a cylindrical structure, the perforated plate (6) is arranged inside the cylinder body (15), the bottom end of the perforated plate is provided with an air inlet, a steel grating (2) is arranged above the air inlet, the top end of the cylinder body (15) is connected with the end enclosure (8) through the top large flange (7), and the bottom end of the perforated plate is connected with the top of the storage bin through the bottom large flange (1);

a filtering chamber is arranged between the perforated plate (6) and the steel grating (2), the filtering bags (12) are arranged below the perforated plate (6) and are linearly arranged, the filtering chambers are fixedly opened through keels (11), the keels (11) are welded with the perforated plate (6), and the top ends of the filtering bags (12) are connected with an ash removal system;

an air purifying chamber is arranged between the perforated plate (6) and the end enclosure (8), one side of the outer wall of the air purifying chamber cylinder body (15) is provided with a drain hole (16), and the other side is provided with a hanging column (9);

the security system comprises a blasting sheet assembly (3) and a differential pressure transmitter (4), wherein a blasting opening is formed in the outer wall of the barrel (15) below the filter bag (12), the blasting sheet assembly (3) is arranged on the blasting opening, and the differential pressure transmitter (4) is arranged on the outer wall of the barrel (15) above the blasting sheet assembly (3) and is welded with the barrel (15);

the dust cleaning system comprises a pulse control box (5), an air bag (10), a pulse valve (14) and an injection tube (13), wherein the pulse control box (5) is arranged on one side of a barrel (15) above the security system, the air bag (10) filled with compressed gas is arranged on the other side of the barrel (15), a filter bag (12) is connected with the air bag (10) through the injection tube (13), the pulse valve (14) is arranged at one end, close to the air bag (10), of the injection tube (13), an injection hole (131) is formed in the injection tube (13) and is right opposite to one side of the filter bag (12), the filter bag (12) is connected with the injection hole (131) through a venturi tube, and the air bag (10), the pulse valve (14), the injection tube (13) and the filter bag (12) are connected through bolts or welding.

2. A bin top type pulse back blowing dust remover according to claim 1, characterized in that the size of said steel grating (2) matches the size of the bottom surface of the cylinder (15).

3. A bin-top blowback precipitator according to claim 1, c h a r a c t e r i z e d in that the suspension posts (9) are standard tower-top suspension posts.

4. The bin top type pulse back-blowing dust collector as claimed in claim 1, wherein the filter bag (12) is made of terylene needle felt and antistatic peritoneum filter material.

5. A bin top type pulse back blowing dust remover according to claim 1, characterized in that said keel (11) is made of a cold drawn steel wire of 304 stainless steel.

6. A bin top type pulse back-blowing dust collector as claimed in claim 1, wherein the air bag (10) is stored with compressed air or nitrogen with a pressure resistance of 1 Mpa.

7. A bin top type pulse back-blowing dust remover according to claim 1, characterized in that the control parameters of said pulse control box (5) are set according to actual requirements.

8. A bin top type pulse back blow dust collector according to claim 1, characterized in that the burst pressure of the burst disk assembly (3) is set between the working pressure and the design pressure of the dust collector.

9. The bin top type pulse back-blowing dust collector as claimed in claim 1, wherein the top large flange (7), the perforated plate (6), the steel grating (2), the bottom large flange (1), and the suspension post (9) are welded with the cylinder (15).

10. A bin top type pulse back-blowing dust remover according to claim 1, characterized in that said end socket (8) is welded with the top large flange (7).

11. A dust removal method of a bin top type pulse back-blowing dust remover is characterized in that the bin top type pulse back-blowing dust remover disclosed by claim 1 is adopted, the bottom end of the dust remover is connected with the top end of a bin through a large bottom flange (1), dust-containing gas in the bin enters a filter chamber in the dust remover through an air inlet at the bottom end of a cylinder (15), dust in the dust-containing gas is adsorbed by a filter bag (12) in the filter chamber after being filtered by the filter chamber, the dust is attached to the outer surface of the filter bag (12) to form a dust layer, and the filtered clean gas enters a gas purifying chamber and is discharged to the atmosphere or a safe area through a emptying hole (16).

12. The dust collecting method of claim 11, wherein the dust concentration of the gas discharged from the air-purifying chamber is at most 20mg/m³。

13. The dust cleaning method of the bin top type pulse back-blowing dust collector is characterized in that the bin top type pulse back-blowing dust collector disclosed by claim 1 is adopted, the bottom end of the dust collector is connected with the top end of a bin through a large bottom flange (1), a dust cleaning program is set through a pulse control box (5), a dust cleaning instruction is sent through the pulse control box (5), a pulse valve (14) is opened to release compressed air in an air bag (10), the compressed air is blown to the interior of a filter bag (12) through a blowing hole (131) in a blowing pipe (13), high-speed compressed air generates shock waves on the surface of the filter bag (12), the shock waves are transmitted along the filter bag (12), the filter bag (12) is vibrated, a dust layer gathered on the outer surface of the filter bag (12) is peeled off, dust agglomerates fall into the bin, and the dust agglomerates fall into the bin for recycling.

14. The method of claim 13, wherein the ash removal duration of the ash removal process is set according to the characteristics of the cleaning dust.

Technical Field

The invention relates to the field of dust collectors, in particular to a top bin type pulse back-blowing dust collector.

Background

At present, most petrochemical enterprises adopt a traditional bag-type dust collector to filter dust-containing airflow inside a tail end pipeline of an air supply system and at a dust raising point, but the space of a petrochemical operation site is limited, according to the management index of brush-shaped discharge caused by charged cloud in a grounding container in Japan electrostatic safety guidelines, the larger the size of the internal space of the dust collector is, the more easily charged 'charge cloud' is formed, and the more easily charged 'charge cloud' is formed, so that incendive discharge is caused.

Meanwhile, in the production process of the existing petrochemical granule products such as polyolefin and polyester products, a certain amount of fine powder appears in the products due to particle tailing, particle cutter gaps, template hole blocking and the like, which seriously affects the reputation degree and the quality of downstream products, for example, the fine powder carried by bottle-grade polyester slice granule products can cause crystal points when a user blows bottles, so that the content of the fine powder in the petrochemical granule products must be strictly controlled, and the gas dust removal and the dust recovery of the tail end of a pneumatic conveying system for powdery materials such as polyolefin and polyester need to be realized in a limited petrochemical operation space.

Disclosure of Invention

The invention aims to solve the problems and provides a bin top type pulse back-blowing dust remover which is directly arranged at the top of a bin through a large bottom flange for gas dust removal, has a compact structure, is suitable for an operation space with limited operation space, adopts pulse control high-pressure gas for online dust removal, has the characteristics of large kinetic energy and good dust removal effect, and effectively solves the problems of gas dust removal and dust collection in the conveying and packaging processes of chemical granular products.

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

a storehouse top type pulse back-blowing dust remover comprises a shell, a filter chamber, an air purifying chamber, a security system and an ash cleaning system;

the shell comprises a bottom large flange 1, a cylinder body 15, a perforated plate 6, a top large flange 7, an end enclosure 8 and a hanging column 9, wherein the cylinder body 15 is arranged between the top large flange 7 and the bottom large flange 1 and is of a cylindrical structure, the perforated plate 6 is arranged in the cylinder body 15, the bottom end of the perforated plate is provided with an air inlet, a steel grating 2 is arranged above the air inlet, the top end of the cylinder body 15 is connected with the end enclosure 8 through the top large flange 7, and the bottom end of the perforated plate is connected with the top of a storage bin through the bottom large flange 1;

a filtering chamber for filtering dust is arranged between the perforated plate 6 and the steel grating 2, the filtering bags 12 are arranged below the perforated plate 6 and are linearly arranged and are fixedly expanded through keels 11, the keels 11 are welded with the perforated plate 6, and the top ends of the filtering bags 12 are connected with an ash removal system;

a gas purifying chamber for storing filtered clean gas is arranged between the perforated plate 6 and the end enclosure 8, one side of the outer wall of the gas purifying chamber cylinder 15 is provided with a drain hole 16, and the other side is provided with a hanging column 9;

the security system comprises a rupture disk assembly 3 and a differential pressure transmitter 4, wherein a rupture port is formed in the outer wall of the cylinder 15 below the filter bag 12, the rupture disk assembly 3 is arranged on the rupture port, and the differential pressure transmitter 4 is arranged on the outer wall of the cylinder 15 above the rupture disk assembly 3 and is welded with the cylinder 15;

the dust cleaning system comprises a pulse control box 5, an air bag 10, a pulse valve 14 and an injection tube 13, wherein the pulse control box 5 is arranged on one side of a barrel 15 above the security system, the air bag 10 filled with compressed gas is arranged on the other side of the barrel 15, a filter bag 12 is connected with the air bag 10 through the injection tube 13, the pulse valve 14 is arranged at one end, close to the air bag 10, of the injection tube 13, an injection hole 131 is formed in one side, opposite to the filter bag 12, of the injection tube 13, the filter bag 12 is connected with the injection hole 131 through a venturi tube, and the air bag 10, the pulse valve 14, the injection tube 13 and the filter bag 12 are connected through bolts or welding.

Preferably, the steel grating 2 is matched in size with the bottom surface of the cylinder 15.

Preferably, the suspension post 9 is a standard tower top type suspension post for connecting an electric or hand hoist.

Preferably, the filter bag 12 is made of a polyester needle felt and an antistatic peritoneal filter material.

Preferably, the keel 11 is made of a cold-drawn steel wire made of 304 stainless steel.

Preferably, the air bag 10 stores compressed air or nitrogen, and the pressure resistance is 1 Mpa.

Preferably, the control parameters of the pulse control box 5 are set according to actual requirements.

Preferably, the burst pressure of the burst disk assembly 3 is set between the operating pressure and the design pressure of the dust separator.

Preferably, the top large flange 7, the perforated plate 6, the steel grating 2, the bottom large flange 1 and the suspension column 9 are connected with the cylinder body 15 in a welding manner.

Preferably, the seal head 8 is connected with the top large flange 7 in a welding mode.

A dust removal method of a bin top type pulse back-blowing dust remover adopts the bin top type pulse back-blowing dust remover, the bottom end of the dust remover is connected with the top end of a bin through a bottom large flange 1, dust-containing gas in the bin enters a filtering chamber in the dust remover through an air inlet at the bottom end of a cylinder 15, the dust in the dust-containing gas is absorbed by a filtering bag 12 in the filtering chamber after being filtered by the filtering chamber, a dust layer is formed by being attached to the outer surface of the filtering bag 12, and the filtered clean gas enters a gas purifying chamber and is discharged to the atmosphere or a safe area through an emptying hole 16.

Preferably, the dust concentration of the gas which is allowed to be discharged to the outside by the air purifying chamber is 20mg/m at most³。

The utility model provides an deashing method of storehouse top formula pulse blowback dust remover, adopt storehouse top formula pulse blowback dust remover as above, be connected dust remover bottom and feed bin top through bottom large flange 1, utilize pulse control box 5 to set up the deashing procedure, send the deashing instruction through pulse control box 5, open the compressed air of pulse valve 14 release gas bag 10, compressed air blows to inside filter bag 12 through the blowing hole 131 on the jetting pipe 13, high-speed compressed gas produces the shock wave on the surface of filter bag 12, the shock wave propagates along filter bag 12, lead to filter bag 12 to take place vibrations, the dust layer of gathering on the surface of filter bag 12 peels off, the dust caking falls into in the feed bin, recycle again.

Preferably, the ash removal procedure duration is set according to the cleaning dust characteristics.

The invention has the following beneficial technical effects:

1. the top of the dust remover adopts a large flange type, the end socket can move, and a maintainer does not need to enter the dust remover for maintenance operation, so that the maintainer is prevented from contacting dust harmful to a human body, and the dust remover is more convenient and safer.

2. The dust cleaning system of the dust remover adopts high-pressure gas pulse on-line dust cleaning, has large kinetic energy and good dust cleaning effect, and dust falling off during dust cleaning directly falls into the hopper for recycling without waste; a fan is not required to be configured in the dust removal process, so that the energy consumption is low; the instruction action of the dust remover is automatically controlled, the automation degree is high, the reliability is high, and the cost performance is high.

3. The dust remover security system provided by the invention is provided with the explosion-proof sheet assembly, so that the accident caused by the crushing burst of equipment under extremely high pressure is effectively prevented, and meanwhile, the differential pressure transmitter is arranged to remotely detect the change of differential pressure, detect the working state of the filter bag of the filter chamber in time, facilitate the timely maintenance and replacement of the filter bag and have the function of safety warning.

4. The dust remover provided by the invention has wide application, is suitable for continuous operation places, local high-concentration dust raising points and other operation spaces, can be connected with the tail ends of various pneumatic conveying systems, and has good sealing property and compatibility.

Drawings

FIG. 1 is a front view of a top-bin type pulse back-blowing dust collector of the present invention.

FIG. 2 is a side view of a top-bin type pulse back-blowing dust collector of the present invention.

FIG. 3 is a top view of a top-loading type pulse back-blowing dust collector of the present invention.

In the figure: 1-bottom large flange, 2-steel grating, 3-blasting sheet component, 4-differential pressure transmitter, 5-pulse control box, 6-perforated plate, 7-top large flange, 8-end socket, 9-suspension column, 10-air bag, 11-keel, 12-filter bag, 13-blowing pipe, 131-blowing hole, 14-pulse valve, 15-barrel and 16-emptying hole.

Detailed Description

The invention is described in further detail below with reference to the following figures and examples:

as shown in fig. 1-3, the invention provides a bin top type pulse back-blowing dust remover, which comprises a shell, a filter chamber, a gas purifying chamber, a security system and a dust removing system;

the shell comprises a bottom large flange 1, a cylinder body 15, a perforated plate 6, a top large flange 7, an end enclosure 8 and a hanging column 9, wherein the cylinder body 15 is arranged between the top large flange 7 and the bottom large flange 1 and is of a cylindrical structure, the perforated plate 6 is arranged inside the cylinder body 15, the bottom end of the cylinder body 15 is provided with an air inlet for allowing dust-containing gas to enter a dust remover, in order to prolong the service life of a filter bag 12 in a filter chamber, the flow rate of the dust-containing gas is required to be lower than 0.8m/min, a steel grating 2 is arranged above the air inlet, the size of the steel grating 2 is matched with that of the bottom surface of the cylinder body 15, the filter bag 12 is used for falling into a storage bin accidentally, the top end of the cylinder body 15 is connected with the end enclosure 8 through the top large flange 7, the bottom end of the cylinder body is connected with the top of the storage bin through the bottom large flange 1, the top large flange 7, the perforated plate 6, the steel grating 2, the bottom large flange 1 and the hanging column 9 are welded with the cylinder body 15, the seal head 8 is connected with the top large flange 7 through welding.

A filtering chamber is arranged between the perforated plate 6 and the steel grating 2 and is used for filtering dust in dust-containing gas, the perforated plate 6 is blanked by laser cutting, the size of the perforated plate is ensured to be matched with that of the filtering bag 12, the filtering bag 12 used for accumulating dust is arranged below the perforated plate 6, the filtering bag 12 is made of polyester needle felt and anti-static peritoneum filtering materials and is linearly arranged and is fixedly propped open through a keel 11, the keel 11 is made of a cold-drawn steel wire made of 304 stainless steel materials, the steel wire has strong rigidity and strength and ensures the supporting effect on the filtering bag 12, the keel 11 is welded with the perforated plate 6, and the top end of the filtering bag 12 is connected with an ash removal system;

a gas purifying chamber is arranged between the perforated plate 6 and the end socket 8 and is used for storing the filtered clean gas, one side of the outer wall of the cylinder 15 of the gas purifying chamber is provided with a drain hole 16 which is connected with the external environment, and the dust concentration of the gas which is allowed to be discharged to the outside by the gas purifying chamber is at most 20mg/m³The opposite side is provided with davit 9, davit 9 is standard top of the tower formula davit for connect electric block or hand block, lift by crane head 8 when conveniently overhauing, overhaul or reform transform dust remover internals, operating personnel need not get into the inside operation that carries out of dust remover this moment, avoided the harmful dust of maintainer contact, top large flange 7, flower hole board 6, steel grating 2, bottom large flange 1, davit 9 and 15 welded connection of barrel, head 8 passes through welded connection with top large flange 7.

The security system comprises a rupture disk assembly 3 and a differential pressure transmitter 4, wherein a rupture port is formed in the outer wall of a cylinder 15 below a filter bag 12, the rupture disk assembly 3 is arranged on the rupture port, and the rupture pressure of the rupture disk assembly 3 is set between the actual working pressure and the design pressure of the dust remover and used for preventing the equipment from being crushed and burst; differential pressure transmitter 4 sets up on the 15 outer walls of barrel above blasting piece subassembly 3, with barrel 15 welded connection for differential pressure in remote monitoring filter bag 12 and the filter chamber, when differential pressure transmitter 4 shows that differential pressure is unusual to zero, then indicate filter bag 12 damaged, when differential pressure transmitter 4 shows that differential pressure is unusual to rise, then indicate that filter bag 12 blocks up, have safety warning's effect according to differential pressure transmitter 4, remind the maintainer in time to overhaul or change filter bag 12.

The ash removal system comprises a pulse control box 5, an air bag 10, a pulse valve 14 and an injection tube 13, wherein the pulse control box 5 is arranged on one side of the outer wall of a barrel 15 above a security system, the air bag 10 is opposite to the pulse control box 5 and is distributed on the other side of the barrel 15, the pressure resistance of the air bag 10 is 1Mpa, the buffer storage requirement of compressed gas is met, the capacity coefficient is larger than 1.5, the air bag 10 has enough pressure in the ash removal process, compressed air or nitrogen is filled into the air bag 10, the filter bag 12 is connected with the air bag 10 through the injection tube 13, the pulse valve 14 is arranged at one end, close to the air bag 10, of the injection tube 13, the size of the pulse valve is 1 inch, an injection hole 131 is formed in the injection tube 13, the filter bag 12 is connected with the injection hole 131 through a Venturi tube, and the air bag 10, the pulse valve 14, the injection tube 13 and the filter bag 12 are connected in a welding mode.

The top-type pulse back-blowing dust remover provided by the invention is used for carrying out dust removal operation on a single storage bin, the bottom end of the dust remover is connected with the top end of the storage bin through a large bottom flange 1, powdery or granular materials are conveyed into the storage bin through a pneumatic conveying pipeline, the materials fall into a hopper under the blowing assisting action of tail material pressure, dust-containing gas escapes upwards and enters a filter chamber through an air inlet at the bottom end of a dust remover cylinder 15 for dust removal, after the dust-containing gas enters the filter chamber, dust in the gas is adsorbed by the filter bag 12 and then adheres to the outer surface of the filter bag 12 to form a dust layer, the filtered clean gas enters an air purifying chamber, and the dust concentration of the gas in the air purifying chamber is 10mg/m³And is vented to atmosphere or a safe area through vent 16 in compliance with the venting standards.

The top-type pulse back-blowing dust remover provided by the invention is used for carrying out dust removal operation on a plurality of adjacent bins, the bottom end of the dust remover is connected with the top end of one bin through a large bottom flange 1, each bin is connected through a ventilation pipeline to introduce dust-containing gas into the same top-type pulse back-blowing dust remover for concentrated dust removal, powdery or granular materials are conveyed into the bins through a pneumatic conveying pipeline, the materials fall into a hopper under the blowing assisting effect of tail material pressure, the dust-containing gas escapes upwards and enters a filter chamber through an air inlet at the bottom end of a dust remover cylinder body 15 for dust removal, and the dust-containing gas enters the filter chamber and passes through the air inletAfter the filter chamber, dust in the gas is adsorbed by the filter bag 12 and then attached to the outer surface of the filter bag 12 to form a dust layer, the filtered clean gas enters a gas purifying chamber, and the dust concentration of the gas in the gas purifying chamber is 10mg/m³And is vented to atmosphere or a safe area through vent 16 in compliance with the venting standards.

Because the no-load operation resistance of the bin top type pulse back-blowing dust collector is 800Pa plus 500 Pa, after the belt material operates for a period of time, a stable initial dust layer is formed on the surface of the dust collector due to the fact that the filter bag adsorbs dust, the operation resistance of the dust collector is increased to 1000Pa, the operation resistance of the dust collector is continuously increased along with the increase of the thickness of the dust layer attached to the filter bag 12, and when the operation resistance of the dust collector is increased to 1800Pa plus 1500 Pa, in order to ensure that the dust collector can be continuously and effectively used, the dust layer attached to the surface of the filter bag 12 needs to be removed by using the dust removal system.

The invention provides a top-bin pulse back-blowing dust collector for dust cleaning, the bottom end of the dust collector is connected with the top end of a bin through a large bottom flange 1, according to the dust characteristics to be cleaned, a pulse control box 5 is used for setting a dust cleaning program, the pulse width is set to be 100 plus material 200ms, the pulse interval is set to be 5-30s, the pulse control box 5 sends a dust cleaning instruction to open a pulse valve 14, the pulse valve 14 releases compressed air with the pressure of 0.4-0.6MPa from an air bag 10 at the moment of sending the dust cleaning instruction, the high-speed compressed air is blown into a filter bag 12 at a high speed through a blowing hole 131 on a blowing pipe 13 under the flow guide effect of a venturi tube, the blowing pressure of the gas in the blowing pipe 13 is 0.4-0.5MPa, secondary air flow is generated on the surface of the filter bag 12 while the compressed gas is blown into the filter bag 12, and shock waves which are transmitted downwards along the direction of the filter bag 12 are formed instantaneously, the vibration of the whole filter bag 12 is caused, so that the dust layer gathered on the outer surface of the filter bag 12 is peeled off and falls off, and dust cakes fall into the hopper in the storage bin again for recycling through the bottom of the dust remover.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.