阅读说明：本技术 一种小铅炉 (Small lead furnace ) 是由 金标 赵春平 罗土福 掌冠华 曾观明 王庆云 王琪琪 狄学峰 赵云 周耀 于 2020-04-30 设计创作，主要内容包括：本发明公开了一种小铅炉,包括与溶铅炉通过输铅管道连接的铅炉本体,所述铅炉本体主要包括炉体及设置在炉体内的开关装置,炉体的顶部炉壁上设置有盖板,盖板上开设有输铅口,炉体的底部设置有导向板,该导向板上均匀开设有若干个用于流出铅液的排铅孔,导向板的底部可拆卸设置有导流板；所述开关装置主要包括开关顶针、提升板及气缸,所述开关顶针的底部可以与排铅孔紧密接触以控制排铅孔的开闭,所述提升板设置在所述盖板的顶部并通过穿设在该盖板上的通孔与开关顶针固定连接,所述气缸通过活塞杆与所述提升板连接并通过驱动提升板的上下运动以带动开关顶针上下运动,所述炉体内设置有可以控制炉体内铅液高度的液面控制机构。(The invention discloses a small lead furnace, which comprises a lead furnace body connected with a lead dissolving furnace through a lead conveying pipeline, wherein the lead furnace body mainly comprises a furnace body and a switch device arranged in the furnace body; the switching device mainly includes switch thimble, lift plate and cylinder, the bottom of switch thimble can with arrange the switching of plumbous hole in close contact with in order to control row plumbous hole, the lift plate sets up the top of apron and through wearing to establish through-hole and switch thimble fixed connection on this apron, the cylinder pass through the piston rod with the lift plate is connected and through the up-and-down motion of drive lift plate in order to drive switch thimble up-and-down motion, be provided with the liquid level control mechanism that can control lead liquid height in the furnace body.)

1. The utility model provides a little lead stove, includes and dissolves the lead stove body of lead stove through defeated plumbous pipe connection, its characterized in that: the lead furnace body mainly comprises a furnace body and a switch device arranged in the furnace body, wherein a cover plate is arranged on the furnace wall at the top of the furnace body, a lead conveying port for connecting with a lead conveying pipeline of the lead melting furnace is formed in the cover plate, a guide plate is arranged at the bottom of the furnace body, a plurality of lead discharging holes for discharging lead liquid are uniformly formed in the guide plate, a guide plate is detachably arranged at the bottom of the guide plate, and guide holes corresponding to the number and the positions of the lead discharging holes in the guide plate are formed in the guide plate; the switch device mainly comprises a switch thimble, a lifting plate and an air cylinder, wherein the bottom of the switch thimble can be in close contact with the lead discharging hole so as to control the opening and closing of the lead discharging hole, the lifting plate is arranged at the top of the cover plate and is fixedly connected with the switch thimble through a through hole penetrating through the cover plate, and the air cylinder is connected with the lifting plate through a piston rod and drives the lifting plate to move up and down by driving the lifting plate to move up and down; the air cylinders comprise a group of first air cylinders which are arranged on an air cylinder support in a bilateral symmetry mode and two groups of second air cylinders which are arranged on the front side and the rear side of the first air cylinders respectively, the lifting plates comprise first lifting plates connected with piston rods of the first air cylinders and second lifting plates which are arranged on the front side and the rear side of the first lifting plates respectively and connected with piston rods of the second air cylinders respectively, at least four switch thimbles are arranged at the bottom of each first lifting plate and drive the switch thimbles to move up and down, and at least two switch thimbles are arranged at the bottom of each second lifting plate and drive the switch thimbles to move up and down; and a liquid level control mechanism capable of controlling the height of the lead liquid in the furnace body is arranged in the furnace body.

2. The small lead furnace according to claim 1, wherein: the cylinder support comprises a top plate and a cylinder fixing plate fixedly arranged on the top plate, and the top plate is fixedly connected with the cover plate through an I-shaped supporting rod arranged on the cover plate; the first lifting plate and the second lifting plate are respectively provided with at least two groups of guide mechanisms connected with the top plate, each guide mechanism comprises a guide sleeve and guide pillars which are arranged in the guide sleeves and can move up and down relative to the guide sleeves, and the guide mechanisms are respectively arranged on the two sides of the first lifting plate and the second lifting plate, which correspond to the piston rods, along the length direction of the first lifting plate and the second lifting plate.

3. The small lead furnace according to claim 1 or 2, characterized in that: the plug valve is characterized in that plug valves corresponding to the number of the lead discharging holes are integrally arranged on the lead discharging holes of the guide plate, inner through holes communicated with the lead discharging holes are vertically arranged on the plug valves, the diameter of each inner through hole is the same as that of the switch thimble, and grooves penetrating through the inner through holes are formed in the plug valves in a direction parallel to the length direction of the guide plate.

4. The small lead furnace according to claim 3, wherein: the bottom of switch thimble is provided with thimble taper head, thimble taper head sets up the cylindrical needle point in the transition bottom including falling trapezoidal transition and integral type, the downside of arranging the plumbous hole with the shape and the size of thimble taper head match, and when the piston rod of cylinder removed the maximum position, the overhead cylindrical needle point of thimble taper can partially extend the bottom of arranging the plumbous hole.

5. The small lead furnace according to claim 4, wherein: the top of switch thimble is provided with round platform shape spliced pole, be provided with respectively in first lift plate and the second lift plate with the round platform shape spliced pole shape of switch thimble and the installation counter bore that the size matches, the switch thimble passes through the round platform shape spliced pole joint at top in the installation counter bore that corresponds the lift plate, is provided with the pressure spring who is connected with round platform shape spliced pole contact in the installation counter bore.

6. The small lead furnace according to claim 5, wherein: the outer wall of the furnace body is coated with a heat insulation layer, and the outer surface of the heat insulation layer is provided with a high-frequency heating coil.

7. The small lead furnace according to claim 5, wherein: the piston rod of first cylinder and second cylinder respectively through promoting the connecting block with first promotion board and second promote the board and correspond the connection, promote the connecting block including promoting the board and setting up the promotion post in promoting the board bottom, cup jointed the spring that supports on promoting the board on the promotion post.

8. The small lead furnace of claim 5, wherein: the liquid level control mechanism comprises a liquid level sensing buoy arranged in the furnace body and a mechanical valve which is arranged on the cylinder fixing plate and connected with the liquid level sensing buoy.

9. The small lead furnace according to any one of claims 4 to 8, wherein: the flow guide hole on the guide plate comprises a lead liquid flow guide groove arranged at the top of the guide plate and a discharge hole arranged at the bottom of the guide plate and corresponding to the lead liquid flow guide groove, a flow distribution mechanism capable of distributing the flowing lead liquid to enable the lead liquid to uniformly flow out of the discharge hole is arranged in the lead liquid flow guide groove, the discharge hole is communicated with the lead liquid flow guide groove through the flow distribution mechanism, the lead liquid flows into the lead liquid flow guide groove and flows into the corresponding discharge hole through the flow distribution mechanism, and then the lead liquid is discharged into a forming groove of the mold through the discharge hole.

10. The small lead furnace of claim 9, wherein: the shape of lead liquid guiding gutter is rectangular shape, and the upper surface of lead liquid guiding gutter is provided with the circular slot that is convenient for lead liquid to pour into of inwards sunken, reposition of redundant personnel mechanism is just setting up the triangle-shaped flow distribution plate in the lead liquid guiding gutter to the centre of a circle of circular slot, the quantity in discharge orifice is the twice of lead liquid guiding gutter quantity and sets up respectively in the bottom both sides of triangle-shaped flow distribution plate.

Technical Field

The invention belongs to the technical field of storage battery manufacturing, and particularly relates to a small lead furnace.

Background

Lead-acid storage battery (VRLA), an electrode mainly made of lead and its oxide, the electrolyte is sulfuric acid solution storage battery, with the development of science and technology and the popularization and use of civil electric appliances, the lead-acid storage battery is also more and more widely applied in the market. Lead and lead alloy are melted in the manufacturing process of the lead-acid storage battery, the temperature uniformity of the currently used lead melting furnace or lead melting pot is poor, the combustion is incomplete, the control means is backward, the energy consumption is high, the heat efficiency is low, the service life of the lead melting pot is short, the lead melting furnace or lead melting pot is in an open design, an electric heating pipe is adopted for heating, the lead and the lead alloy are subjected to oxidation reaction with oxygen in the air under the high-temperature environment, lead slag and lead smoke are formed, and the production waste and the environmental pollution are caused.

In addition, the existing lead dissolving furnaces are designed in an integrated mode, namely, a feeding hole and a discharging hole are formed in the same lead dissolving furnace, lead liquid in the discharging hole is directly poured, and the defects that the lead liquid is not uniformly melted, the quality of poured products is poor and the like are easily caused by the pouring mode.

Disclosure of Invention

The invention aims to solve the technical problem of providing a small lead furnace which has simple structure, high production efficiency and uniform lead discharging aiming at the defects in the prior art.

The invention aims to solve the technical scheme that the small lead furnace comprises a lead furnace body connected with a lead dissolving furnace through a lead conveying pipeline, wherein the lead furnace body mainly comprises a furnace body and a switch device arranged in the furnace body, a cover plate is arranged on the furnace wall at the top of the furnace body, a lead conveying port connected with the lead conveying pipeline of the lead dissolving furnace is formed in the cover plate, a guide plate is arranged at the bottom of the furnace body, a plurality of lead discharging holes for discharging lead liquid are uniformly formed in the guide plate, a guide plate is detachably arranged at the bottom of the guide plate, and guide holes corresponding to the number and the positions of the lead discharging holes in the guide plate are formed in the guide plate; the switch device mainly comprises a switch thimble, a lifting plate and an air cylinder, wherein the bottom of the switch thimble can be in close contact with the lead discharging hole so as to control the opening and closing of the lead discharging hole, the lifting plate is arranged at the top of the cover plate and is fixedly connected with the switch thimble through a through hole penetrating through the cover plate, and the air cylinder is connected with the lifting plate through a piston rod and drives the lifting plate to move up and down by driving the lifting plate to move up and down; the air cylinders comprise a group of first air cylinders which are arranged on an air cylinder support in a bilateral symmetry mode and two groups of second air cylinders which are arranged on the front side and the rear side of the first air cylinders respectively, the lifting plates comprise first lifting plates connected with piston rods of the first air cylinders and second lifting plates which are arranged on the front side and the rear side of the first lifting plates respectively and connected with piston rods of the second air cylinders respectively, at least four switch thimbles are arranged at the bottom of each first lifting plate and drive the switch thimbles to move up and down, and at least two switch thimbles are arranged at the bottom of each second lifting plate and drive the switch thimbles to move up and down; and a liquid level control mechanism capable of controlling the height of the lead liquid in the furnace body is arranged in the furnace body.

Further, the cylinder support comprises a top plate and a cylinder fixing plate fixedly arranged on the top plate, and the top plate is fixedly connected with the cover plate through an I-shaped supporting rod arranged on the cover plate; the first lifting plate and the second lifting plate are respectively provided with at least two groups of guide mechanisms connected with the top plate, each guide mechanism comprises a guide sleeve and guide pillars which are arranged in the guide sleeves and can move up and down relative to the guide sleeves, and the guide mechanisms are respectively arranged on the two sides of the first lifting plate and the second lifting plate, which correspond to the piston rods, along the length direction of the first lifting plate and the second lifting plate.

Furthermore, the plug valves corresponding to the lead discharging holes in number are integrally arranged on the lead discharging holes of the guide plate, inner through holes communicated with the lead discharging holes are vertically formed in the plug valves, the diameter of each inner through hole is the same as that of the switch thimble, and grooves penetrating through the inner through holes are formed in the plug valves in a direction parallel to the length direction of the guide plate.

Further, the bottom of switch thimble is provided with thimble taper head, thimble taper head sets up the cylindrical needle point in the transition head bottom including the transition head and the integral type of falling trapezoidal, the downside of arranging the plumbous hole with the shape and the size of thimble taper head match, and when the piston rod of cylinder removed the maximum position, the cylindrical needle point on the thimble taper head can partially extend the bottom of arranging the plumbous hole.

Further, the top of switch thimble is provided with round platform shape spliced pole, be provided with respectively in first lift plate and the second lift plate with the installation counter bore that the round platform shape spliced pole shape and the size of switch thimble match, the switch thimble passes through the round platform shape spliced pole joint at top in the installation counter bore that corresponds the lift plate, is provided with the pressure spring who is connected with round platform shape spliced pole contact in the installation counter bore.

Furthermore, a heat insulation layer is coated on the outer wall of the furnace body, and a high-frequency heating coil is arranged on the outer surface of the heat insulation layer.

Further, the piston rods of the first cylinder and the second cylinder are respectively connected with the first lifting plate and the second lifting plate through lifting connecting blocks, each lifting connecting block comprises a lifting plate and a lifting column arranged at the bottom of the lifting plate, and the lifting column is sleeved with a spring supported on the lifting plate.

Furthermore, the liquid level control mechanism comprises a liquid level sensing buoy arranged in the furnace body and a mechanical valve which is arranged on the cylinder fixing plate and connected with the liquid level sensing buoy.

Further, the discharge hole in the bottom of the guide plate is formed by the lead liquid guide groove in the top of the guide plate and the discharge hole corresponding to the lead liquid guide groove, a flow dividing mechanism capable of dividing the flowing lead liquid to enable the lead liquid to flow out of the discharge hole evenly is arranged in the lead liquid guide groove, the discharge hole is communicated with the lead liquid guide groove through the flow dividing mechanism, the lead liquid flows into the lead liquid guide groove and flows into the corresponding discharge hole through the flow dividing mechanism, and then the lead liquid is discharged to the forming groove of the die through the discharge hole.

Further, the shape of lead liquid guiding gutter is rectangular shape, and the upper surface of lead liquid guiding gutter is provided with the circular slot that inwards caves in and be convenient for lead liquid to pour into, reposition of redundant personnel mechanism is just setting up the triangle-shaped flow distribution plate in the lead liquid guiding gutter to the centre of a circle of circular slot, the quantity in discharge orifice is the twice of lead liquid guiding gutter quantity and sets up respectively in the bottom both sides of triangle-shaped flow distribution plate.

The invention has the beneficial technical effects that: the invention divides the traditional lead dissolving furnace into a large lead dissolving furnace and a small lead furnace matched with the large lead furnace, lead liquid completely dissolved in the large lead furnace flows into the small lead furnace through a lead conveying pipeline, a liquid level control mechanism is arranged in the small lead furnace to realize the lead adding operation of the lead furnace and maintain the liquid level height in the small lead furnace, the invention controls the lead discharging amount of the lead discharging hole at the bottom of the small lead furnace through the air cylinders, the lifting plate and the switch thimbles which are connected in sequence, the lifting plate is driven by the air cylinders, the control of the switch thimbles by the single air cylinder is realized in the way that the lifting plate drives the switch thimbles, in addition, the plurality of air cylinders are arranged to drive different lifting plates to control the switch thimbles at different positions to move, so as to realize the accurate control of the lead discharging amount in the lead discharging holes at different positions, thus being beneficial to the pouring of products containing various die holes on the same die and greatly improving, in addition, be provided with the guide plate in the bottom of deflector, just flow into the mould from the lead liquid that comes out in the guide plate in, the guide plate can shunt lead liquid to it is more even to distribute in the mould, improves lead acid battery's quality and life, all has not little promotion in productivity and product quality.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic structural diagram of the switching device of the present invention;

FIG. 3 is a schematic side view of the present invention;

FIG. 4 is a schematic view of a switch device according to the present invention in partial cross-section;

FIG. 5 is an enlarged view of the structure at A in FIG. 4;

FIG. 6 is an enlarged view of the structure at B in FIG. 4;

fig. 7 is a schematic structural view of the flow distribution plate according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood by those skilled in the art, the present invention is further described with reference to the accompanying drawings and examples.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "inside", "outside", "lateral", "vertical", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, and thus, should not be construed as limiting the present invention.

As shown in fig. 1-7, the small lead furnace according to the present invention includes a lead furnace body connected to a lead melting furnace through a lead conveying pipeline, the lead furnace body mainly includes a furnace body 1 and a switch device 2 disposed in the furnace body 1, a heat insulation layer 23 is coated on an outer wall of the furnace body 1, a high frequency heating coil 37 is disposed on an outer surface of the heat insulation layer 23, and the temperature of a lead solution in the small lead furnace can be maintained within a processing requirement range through the heat insulation layer 23 and the high frequency heating coil 37; a cover plate 3 is arranged on the top furnace wall of the furnace body 1, a lead conveying port 4 used for being connected with a lead conveying pipeline of the lead melting furnace is formed in the cover plate 3, a handle convenient for opening part of the cover plate 3 to check lead liquid in the furnace body is arranged on one side of the lead conveying port 4, a guide plate 5 is arranged at the bottom of the furnace body 1, a plurality of lead discharging holes 6 used for flowing out the lead liquid are uniformly formed in the guide plate 5, a guide plate 7 is detachably arranged at the bottom of the guide plate 5, and guide holes corresponding to the number and positions of the lead discharging holes 6 in the guide plate 5 are formed in the guide plate 7; the switch device 2 mainly comprises a switch thimble 9, a lifting plate and a cylinder, wherein the bottom of the switch thimble 9 can be in close contact with the lead discharging hole 6 to control the opening and closing of the lead discharging hole 6, the lifting plate is arranged at the top of the cover plate 3 and is fixedly connected with the switch thimble 6 through a through hole penetrating through the cover plate 3, and the cylinder is connected with the lifting plate through a piston rod and drives the switch thimble 9 to move up and down by driving the lifting plate to move up and down; the air cylinders comprise a group of first air cylinders 10 which are arranged on an air cylinder support in a bilateral symmetry mode and two groups of second air cylinders 11 which are arranged on the front side and the rear side of the first air cylinders 10 respectively, each lifting plate comprises a first lifting plate 12 connected with a piston rod of the first air cylinder 10 and second lifting plates 13 which are arranged on the front side and the rear side of the first lifting plate 12 respectively and connected with piston rods of the second air cylinders 11 respectively, at least four switch thimbles 9 are arranged at the bottom of each first lifting plate 12 and drive the switch thimbles 9 to move up and down, the specific number of the switch thimbles can be adjusted according to the number of forming holes of the die, in the embodiment, ten switch thimbles 9 are arranged at the bottom of the first lifting plate 12, and at least two switch thimbles 9 are arranged at the bottom of each second lifting plate 13 and drive the switch; the lead melting furnace is characterized in that a liquid level control mechanism capable of controlling the height of lead liquid in the furnace body 1 is arranged in the furnace body 1, the liquid level control mechanism comprises a liquid level sensing buoy 14 arranged in the furnace body 1 and a mechanical valve 15 arranged on a cylinder support and connected with the liquid level sensing buoy 14, the liquid level sensing buoy 14 rises and falls along with the height of the liquid level, the mechanical valve 15 is opened or closed along with the liquid level, the mechanical valve 15 is electrically connected with a lead pump in the lead melting furnace, the mechanical valve is opened when the lead liquid level is low, the lead pump in the lead melting furnace starts to pump lead, when the lead liquid level meets the requirement, the mechanical valve is closed, the lead pump in the lead melting furnace is closed to stop pumping lead, and therefore the lead feeding or the lead feeding.

Referring to fig. 2-4, the cylinder bracket includes a top plate 16 and a cylinder fixing plate 17 fixedly disposed on the top plate 16, and the top plate 16 is fixedly connected to the cover plate 3 through an i-shaped support rod 18 disposed on the cover plate 3; the first lifting plate 12 and the second lifting plate 13 are respectively provided with at least two sets of guide mechanisms connected with the top plate 16, each guide mechanism comprises a guide sleeve 19 and a guide post 20 which is arranged in the guide sleeve 19 and can move up and down relative to the guide sleeve 19, and the guide mechanisms are respectively arranged on the two sides of the corresponding piston rod of the first lifting plate 12 and the second lifting plate 13 along the length direction of the first lifting plate 12 and the second lifting plate 13.

Referring to fig. 4-5, plug valves 21 corresponding to the number of the lead discharging holes 6 are integrally arranged on the lead discharging holes 6 of the guide plate 5, inner through holes 22 communicated with the lead discharging holes 6 are vertically arranged on the plug valves 21, the diameter of each inner through hole 22 is the same as that of a switch thimble, and grooves 24 penetrating through the inner through holes 22 are formed in the plug valves 21 in parallel with the length direction of the guide plate 5. The bottom of switch thimble 9 is provided with thimble taper head, thimble taper head sets up the cylindrical needle point 26 in transition 25 bottom including the transition 25 and the integral type of falling trapezoidal, the downside of arranging lead hole 6 with the shape and the size of thimble taper head match, and when the piston rod of cylinder removed the maximum position, the overhead cylindrical needle point 26 of thimble taper can partially extend the bottom of arranging lead hole 6.

Referring to fig. 6, the top of the switch thimble 9 is provided with a circular truncated cone-shaped connecting column 27, the first lifting plate 12 and the second lifting plate 13 are respectively provided with an installation counter bore 28 matched with the circular truncated cone-shaped connecting column 27 of the switch thimble 9 in shape and size, the switch thimble 9 is connected in the installation counter bore 28 of the corresponding lifting plate through the circular truncated cone-shaped connecting column 27 at the top in a clamping manner, and a compression spring 29 connected with the circular truncated cone-shaped connecting column 27 in a contact manner is arranged in the installation counter bore 28.

Referring to fig. 4, the piston rods of the first cylinder 10 and the second cylinder 11 are correspondingly connected to the first lifting plate 12 and the second lifting plate 13 through a lifting connection block, the lifting connection block includes a lifting plate 30 and a lifting column 31 disposed at the bottom of the lifting plate 30, and a spring 32 supported on the corresponding lifting plate is sleeved on the lifting column 31.

Referring to fig. 5 to 7, the flow guide holes on the flow guide plate 7 include a lead liquid flow guide groove 33 disposed on the top of the flow guide plate 7 and a tapping hole 34 disposed at the bottom of the flow guide plate 7 and corresponding to the lead liquid flow guide groove 33, a flow distribution mechanism 35 for distributing the lead liquid flowing in is disposed in the lead liquid flow guide groove 33, so that the lead liquid can flow out from the tapping hole 34 uniformly, the tapping hole 34 is communicated with the lead liquid flow guide groove 33 through the flow distribution mechanism 35, and the lead liquid flows into the lead liquid flow guide groove 33, flows into the corresponding tapping hole 34 through the flow distribution mechanism 35, and then flows out to the forming groove of the mold through the tapping hole 34. The shape of lead liquid guiding gutter 33 is rectangular shape, and the upper surface of lead liquid guiding gutter 33 is provided with the circular slot 36 that inwards caves in and be convenient for lead liquid to pour into, reposition of redundant personnel mechanism 35 is just setting up the triangle-shaped flow distribution plate in lead liquid guiding gutter 33 to the centre of a circle of circular slot, the quantity of discharge hole 34 is the twice of lead liquid guiding gutter 33 quantity and sets up respectively in the bottom both sides of triangle-shaped flow distribution plate.

The invention divides the traditional lead dissolving furnace into a large lead dissolving furnace and a small lead furnace matched with the large lead furnace, lead liquid completely dissolved in the large lead furnace flows into the small lead furnace through a lead conveying pipeline, a liquid level control mechanism is arranged in the small lead furnace to realize the lead adding operation of the lead furnace and maintain the liquid level height in the small lead furnace, the invention controls the lead discharging amount of the lead discharging hole at the bottom of the small lead furnace through the air cylinders, the lifting plate and the switch thimbles which are connected in sequence, the lifting plate is driven by the air cylinders, the control of the switch thimbles by the single air cylinder is realized in the way that the lifting plate drives the switch thimbles, in addition, the plurality of air cylinders are arranged to drive different lifting plates to control the switch thimbles at different positions to move, so as to realize the accurate control of the lead discharging amount in the lead discharging holes at different positions, thus being beneficial to the pouring of products containing various die holes on the same die and greatly improving, in addition, be provided with the guide plate in the bottom of deflector, just flow into the mould from the lead liquid that comes out in the guide plate in, the guide plate can shunt lead liquid to it is more even to distribute in the mould, improves lead acid battery's quality and life, all has not little promotion in productivity and product quality.

The specific embodiments described herein are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.