阅读说明：本技术 一种便于装卸的彩钢板加工用钢卷固定装置 (Steel coil fixing device convenient to mount and dismount and used for color steel plate processing ) 是由 刘翰祺 刘德清 于 2020-10-30 设计创作，主要内容包括：本发明公开了一种便于装卸的彩钢板加工用钢卷固定装置,包括底座、安装座和卡合机构,所述底座的左侧固定有电机,所述固定桩固定在滑块的外侧,且固定桩的内部左侧固定有第二液压杆,所述安装座固定在底座的上方,且安装座的上方两端固定有挡板,所述梯形块滑动连接在安装座的内部两端。该便于装卸的彩钢板加工用钢卷固定装置设置有梯形块、第三弹簧和盖板,当钢卷放置在安装座上时会将压板向下压动,同时带动压块抵住推动梯形块使梯形块以及连接杆向外移动,同时连接杆推动活动板在固定杆上转动向内围合使活动板上方的盖板与钢卷的外侧贴合将钢卷压紧在安装座上,提高对钢卷固定效果的同时方便对钢卷装卸,减少钢卷的装卸速度,提高工作效率。(The invention discloses a steel coil fixing device for processing a color steel plate, which is convenient to assemble and disassemble and comprises a base, a mounting seat and a clamping mechanism, wherein a motor is fixed on the left side of the base, a fixed pile is fixed on the outer side of a sliding block, a second hydraulic rod is fixed on the left side of the inside of the fixed pile, the mounting seat is fixed above the base, baffles are fixed at two ends of the upper part of the mounting seat, and a trapezoidal block is connected to two ends of the inside of the mounting seat in a sliding manner. This various steel sheet processing is with coil of strip fixing device convenient to loading and unloading is provided with the trapezoidal piece, third spring and apron, can press the clamp plate downwards when the coil of strip is placed on the mount pad, drive the briquetting simultaneously and support and promote the trapezoidal piece and make trapezoidal piece and connecting rod outwards remove, the connecting rod promotes the fly leaf and rotates inwards on the dead lever and encloses the outside laminating that closes the apron that makes the fly leaf top and coil of strip and compress tightly the coil of strip on the mount pad, convenient loading and unloading to the coil of strip when improving the fixed effect of coil of strip, reduce the loading and unloading speed of coil of strip, and the work efficiency is improved.)

1. The utility model provides a various steel sheet processing is with coil of strip fixing device convenient to loading and unloading, includes base (1), fixed establishment (13), mount pad (14) and block mechanism (18), its characterized in that:

a base (1), wherein a motor (2) is fixed on the left side of the base (1), the output end of the motor (2) is connected with the rotating shaft (3), a first bevel gear (4) is fixed on the rotating shaft (3), the first bevel gear (4) is meshed with the second bevel gear (5), the second bevel gear (5) is fixed on the screw rod (6), the screw rod (6) is rotationally connected inside the base (1), both ends of the screw rod (6) are in threaded connection with threaded pipes (7), a limiting block (8) is fixed on the surface of the threaded pipe (7), a limiting rod (9) is connected on the limiting block (8) in a sliding way, the limiting rod (9) is fixed on the inner side of the base (1), the outer side of the screwed pipe (7) is fixed with a fixing frame (10), a first hydraulic rod (11) is fixed inside the fixed frame (10), and a sliding block (12) is fixed on the first hydraulic rod (11);

the fixing mechanism (13) is used for preventing the steel coil from jumping in the transportation process, and the fixing mechanism (13) is arranged on the sliding block (12);

the mounting base (14) is fixed above the base (1), the two ends of the upper portion of the mounting base (14) are fixedly provided with the baffle plates (15), the pressing plate (16) is fixed above the mounting base (14), and the pressing block (17) is fixed at the bottom of the pressing plate (16);

the clamping mechanism (18) is used for conveniently mounting, dismounting and fixing the steel coil, and the clamping mechanism (18) is mounted on the base (1).

2. The conveniently-assembled and disassembled steel coil fixing device for processing color steel plates, as recited in claim 1, is characterized in that: the fixing mechanism (13) comprises a fixed pile (1301), a second hydraulic rod (1302), a movable block (1303), a movable plate (1304), a top plate (1305), a fixed block (1306) and a first spring (1307), the fixed pile (1301) is fixed on the outer side of the sliding block (12), the second hydraulic rod (1302) is fixed on the left side of the inner portion of the fixed pile (1301), the movable block (1303) is fixed on the second hydraulic rod (1302), the movable plate (1304) is connected to the inner wall of the fixed pile (1301) in a sliding mode, the top plate (1305) is fixed on the outer side of the movable plate (1304) through the fixed pile (1301), a fixed block (1306) is fixed on the right side of the inner portion of the fixed pile (1301), the first spring (1307) is fixed on the fixed block (1306), and the first spring (1307) is connected with the movable plate (1304).

3. The conveniently-assembled and disassembled steel coil fixing device for processing color steel plates, as recited in claim 1, is characterized in that: clamping mechanism (18) include trapezoidal piece (1801), second spring (1802), connecting rod (1803), mounting bracket (1804), dead lever (1805), fly leaf (1806), third spring (1807) and apron (1808), trapezoidal piece (1801) sliding connection is at the inside both ends of mount pad (14), and is fixed with second spring (1802) on trapezoidal piece (1801), is fixed with connecting rod (1803) on trapezoidal piece (1801) simultaneously, the outside both ends of mount pad (14) are fixed with mounting bracket (1804), and are fixed with dead lever (1805) on mounting bracket (1804), it is connected with fly leaf (1806) to rotate on dead lever (1805), and the bottom of fly leaf (1806) rotates and is connected with connecting rod (1803), the top of fly leaf (1806) is fixed with third spring (1807), and is fixed with apron (1808) on third spring (1807).

4. The conveniently-assembled and disassembled steel coil fixing device for processing color steel plates, as recited in claim 1, is characterized in that: the threaded pipe (7), the limiting block (8) and the fixing frame (10) are arranged in two groups and are symmetrically arranged.

5. The conveniently-assembled and disassembled steel coil fixing device for processing color steel plates, as recited in claim 2, is characterized in that: the movable block (1303) and the movable plate (1304) are both trapezoidal, and the movable block (1303) is in sliding connection with the movable plate (1304).

6. The conveniently-assembled and disassembled steel coil fixing device for processing color steel plates, as recited in claim 2, is characterized in that: the top plate (1305) is provided with four groups and is symmetrically arranged.

7. The conveniently-assembled and disassembled steel coil fixing device for processing color steel plates, as recited in claim 3, is characterized in that: the trapezoidal blocks (1801) are connected with the pressing block (17) in a sliding mode, and the trapezoidal blocks (1801) are provided with two groups.

8. The conveniently-assembled and disassembled steel coil fixing device for processing color steel plates, as recited in claim 3, is characterized in that: connecting rod (1803), mounting bracket (1804), dead lever (1805), fly leaf (1806), third spring (1807) and apron (1808) all are provided with two sets ofly, and its equal symmetry sets up.

9. The conveniently-assembled and disassembled steel coil fixing device for processing color steel plates, as recited in claim 3, is characterized in that: the cover plate (1808) is arc-shaped.

Technical Field

The invention relates to the technical field of color steel plate processing equipment, in particular to a steel coil fixing device for color steel plate processing, which is convenient to assemble and disassemble.

Background

The color steel plate is a color-coated steel plate, the color-coated steel plate is a steel plate with an organic coating, and has the characteristics of good corrosion resistance, bright color, attractive appearance, convenient processing and forming, original strength of the steel plate, low cost and the like, steel coils need to be transported to a processing factory for cutting and forming in the processing process, so a steel coil fixing device is needed, most of the existing steel coil fixing methods are used for fixing the steel coils on a truck by binding sleepers and steel wire ropes, the loading and unloading of the steel coils are troublesome, the transportation efficiency is greatly reduced, the existing steel coil fixing devices can only fix the transverse direction or the longitudinal direction of the steel coils, the steel coils are easy to fall off under the inertia acting force generated when the truck turns, and the damage is caused to surrounding vehicles and pedestrians, the existing steel coil fixing devices are poor in fixing effect, most of the steel coils are fixed on the steel coils by the sleepers, and the, the steel coil is easy to jump on the truck due to the fact that the road surface is uneven in the transportation process, the danger is high, and the practicability is poor.

Disclosure of Invention

The invention aims to provide a steel coil fixing device for processing a color steel plate, which is convenient to assemble and disassemble, and aims to solve the problems that the prior steel coil fixing method proposed in the background art mostly fixes a steel coil on a truck by binding sleepers and steel wire ropes, the steel coil is troublesome to assemble and disassemble, the prior steel coil fixing device can only fix the transverse direction or the longitudinal direction of the steel coil, the steel coil is easy to fall off under the action of inertia force, and the prior steel coil fixing device has poor fixing effect, high danger in the transportation process and poor practicability.

In order to achieve the purpose, the invention provides the following technical scheme: a steel coil fixing device for processing a color steel plate, which is convenient to assemble and disassemble and comprises a base, a fixing mechanism, a mounting seat and a clamping mechanism,

the hydraulic press comprises a base, wherein a motor is fixed on the left side of the base, the output end of the motor is connected with a rotating shaft, first bevel teeth are fixed on the rotating shaft and meshed with second bevel teeth, the second bevel teeth are fixed on a screw rod, the screw rod is rotatably connected inside the base, threaded pipes are in threaded connection with two ends of the screw rod, a limiting block is fixed on the surface of each threaded pipe, a limiting rod is connected onto each limiting block in a sliding mode and fixed on the inner side of the base, a fixing frame is fixed on the outer side of each threaded pipe, a first hydraulic rod is fixed inside the fixing frame, and a sliding block is fixed on each first hydraulic rod;

the fixing mechanism is used for preventing the steel coil from jumping in the transportation process and is arranged on the sliding block;

the mounting seat is fixed above the base, two ends of the upper part of the mounting seat are fixedly provided with the baffle plates, the upper part of the mounting seat is fixedly provided with the pressing plate, and the bottom of the pressing plate is fixedly provided with the pressing block;

and the clamping mechanism is used for conveniently assembling, disassembling and fixing the steel coil and is arranged on the base.

Preferably, fixed establishment includes spud pile, second hydraulic stem, movable block, fly leaf, roof, fixed block and first spring, the spud pile is fixed in the outside of slider, and is fixed with the second hydraulic stem on the inside left side of spud pile, is fixed with the movable block on the second hydraulic stem simultaneously, the inner wall sliding connection of spud pile has the fly leaf, and the fly leaf runs through the spud pile outside and is fixed with the roof, the inside right side of spud pile is fixed with the fixed block, and is fixed with first spring on the fixed block, and first spring is connected with the fly leaf simultaneously.

Preferably, block mechanism includes trapezoidal piece, second spring, connecting rod, mounting bracket, dead lever, fly leaf, third spring and apron, trapezoidal piece sliding connection is at the inside both ends of mounting bracket, and is fixed with the second spring on the trapezoidal piece, is fixed with the connecting rod on the trapezoidal piece simultaneously, the outside both ends of mounting bracket are fixed with the mounting bracket, and are fixed with the dead lever on the mounting bracket, rotate on the dead lever and be connected with the fly leaf, and the bottom of fly leaf rotates and is connected with the connecting rod, the top of fly leaf is fixed with the third spring, and is fixed with the apron on the third spring.

Preferably, the screwed pipe, the limiting block and the fixing frame are arranged in two groups and are symmetrically arranged.

Preferably, the movable block and the movable plate are both trapezoidal, and are in sliding connection with each other.

Preferably, the top plate is provided with four groups, and the four groups are symmetrically arranged.

Preferably, the trapezoidal blocks are connected with the pressing block in a sliding mode, and the trapezoidal blocks are provided with two groups.

Preferably, connecting rod, mounting bracket, dead lever, fly leaf, third spring and apron all are provided with two sets ofly, and its equal symmetry sets up.

Preferably, the cover plate is arc-shaped.

Compared with the prior art, the invention has the beneficial effects that: the steel coil fixing device for processing the color steel plate convenient to assemble and disassemble,

(1) be provided with lead screw, screwed pipe, stopper, gag lever post and mount, drive first awl tooth through the motor and rotate and cooperate second awl tooth to drive the lead screw and rotate simultaneously, the lead screw rotates and drives threaded connection's screwed pipe cooperation stopper simultaneously and slides on the gag lever post and make the screwed pipe drive the mount and live the horizontal both ends centre gripping of coil of strip, prevents that the centrifugal force that produces when the vehicle turns from leading to the coil of strip to drop, improves fixed effect.

(2) Be provided with second hydraulic stem, movable block, fly leaf, roof and fixed block, drive the outside extension of movable block through the inside second hydraulic stem of spud pile, support and promote the fly leaf and make its roof card that drives the outside go into the inside of coil of strip, the inner wall of coil of strip can be laminated to the curved roof of cooperation, prevents that the coil of strip from leading to the coil of strip unstable phenomenon of beating in the road unevenness in the transportation, improves the stability in the transportation.

(3) The first hydraulic rod and the sliding block are arranged, the sliding block is driven by the first hydraulic rod to stretch and adjust the height, so that the fixing pile on the sliding block is driven to adjust the height, the height of the fixing pile can be conveniently adjusted according to the size of a steel coil, and the practicability of the fixing pile is improved;

(4) be provided with trapezoidal piece, the connecting rod, the fly leaf, third spring and apron, can push the clamp plate downwards when the coil of strip is placed on the mount pad, drive the briquetting simultaneously and support and promote trapezoidal piece and make trapezoidal piece and connecting rod outwards remove, the connecting rod promotes the fly leaf and rotates the outside laminating that inwards encloses to close the apron that makes the fly leaf top and coil of strip on the dead lever simultaneously and compress tightly the coil of strip on the mount pad, conveniently load and unload the coil of strip when improving the fixed effect of coil of strip, reduce the loading and unloading speed of coil of strip, improve work efficiency.

Drawings

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

FIG. 2 is a schematic side view of the present invention;

FIG. 3 is a schematic view of a spud pile according to the present invention;

FIG. 4 is a side view of the spud pile of the present invention;

FIG. 5 is a schematic side view of the fixing frame of the present invention;

FIG. 6 is a schematic top view of the present invention.

In the figure: 1. the base, 2, the motor, 3, the pivot, 4, first awl tooth, 5, second awl tooth, 6, the lead screw, 7, the screwed pipe, 8, the stopper, 9, the gag lever post, 10, the mount, 11, first hydraulic stem, 12, the slider, 13, fixed establishment, 1301, the spud pile, 1302, second hydraulic stem, 1303, the movable block, 1304, the fly leaf, 1305, the roof, 1306, the fixed block, 1307, first spring, 14, the mount pad, 15, the baffle, 16, the clamp plate, 17, the briquetting, 18, block mechanism, 1801, trapezoidal piece, 1802, the second spring, 1803, the connecting rod, 1804, the mounting bracket, 1805, the dead lever, 1806, the fly leaf, 1807, the third spring, 1808, the apron.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-6, the present invention provides a technical solution: a steel coil fixing device for processing a color steel plate convenient to assemble and disassemble is shown in figures 1 and 2, a motor 2 is fixed on the left side of a base 1, the output end of the motor 2 is connected with a rotating shaft 3, a first bevel gear 4 is fixed on the rotating shaft 3, the first bevel gear 4 is meshed with a second bevel gear 5, the second bevel gear 5 is fixed on a screw rod 6, the screw rod 6 is rotatably connected inside the base 1, threaded pipes 7 are connected at two ends of the screw rod 6 in a threaded manner, a limiting block 8 is fixed on the surface of each threaded pipe 7, a limiting rod 9 is slidably connected on each limiting block 8, each limiting rod 9 is fixed on the inner side of the base 1, a fixing frame 10 is fixed on the outer side of each threaded pipe 7, a first hydraulic rod 11 is fixed inside the fixing frame 10, a sliding block 12 is fixed on each first hydraulic rod 11, two groups of each threaded pipe 7, each limiting block 8 and each fixing frame 10 are symmetrically arranged, drive pivot 3 and first bevel gear 4 through motor 2 and rotate, the second bevel gear 5 on the cooperation lead screw 6 drives lead screw 6 and rotates, and lead screw 6 rotates and drives screwed pipe 7 simultaneously and move cooperation mount 10 on lead screw 6 and live the coil of strip centre gripping, prevents that the centrifugal force that the vehicle produced when turning from resulting in the coil of strip to drop, improves fixed effect.

As shown in fig. 2, 3 and 4, a fixing mechanism 13 for preventing steel coil from jumping during transportation is installed on the slider 12, the fixing mechanism 13 includes a fixed pile 1301, a second hydraulic rod 1302, a movable block 1303, a movable plate 1304, a top plate 1305, a fixed block 1306 and a first spring 1307, the fixed pile 1301 is fixed on the outer side of the slider 12, the second hydraulic rod 1302 is fixed on the left side of the inside of the fixed pile 1301, the movable block 1303 is fixed on the second hydraulic rod 1302, the movable plate 1304 is connected to the inner wall of the fixed pile 1301 in a sliding manner, the top plate 1305 is fixed on the outer side of the fixed pile 1301 through the movable plate 1304, the top plate 1305 is provided with four groups, and the four groups are symmetrically arranged to fit the inner wall of the steel coil conveniently, so as to improve the fixing effect, the fixed block 1306 is fixed on the right side of the inside of the fixed pile 1301, the first spring 1307 is fixed on the fixed block 1306, the first, and be sliding connection between movable block 1303 and the fly leaf 1304, stretch through the inside second hydraulic stem 1302 of spud pile 1301 and promote movable block 1303 and make it support and promote fly leaf 1304 and outwards support the inner wall that cooperates roof 1306 conveniently to support at the coil of strip and fix the coil of strip, prevent that the road unevenness leads to the coil of strip to beat in the vehicle driving process, and stability is improved, and the flexible slider 12 that drives of first hydraulic stem 11 in the cooperation mount 10 reciprocates the position that conveniently adjusts the spud pile 1301 according to the size of coil of strip, improves the practicality.

As shown in fig. 1, 2, 5 and 6, a mounting seat 14 is fixed above a base 1, two ends of the upper side of the mounting seat 14 are fixed with a baffle 15, a pressing plate 16 is fixed above the mounting seat 14, a pressing block 17 is fixed at the bottom of the pressing plate 16, a clamping mechanism 18 for conveniently loading and unloading and fixing a steel coil is installed on the base 1, the clamping mechanism 18 comprises a trapezoidal block 1801, a second spring 1802, a connecting rod 1803, a mounting rack 1804, a fixing rod 1805, a movable plate 1806, a third spring 1807 and a cover plate 1808, the trapezoidal block 1801 is slidably connected at two ends of the inner part of the mounting seat 14, the trapezoidal block 1801 is fixed with the second spring 1802, the connecting rod 1803 is fixed on the trapezoidal block 1801, the trapezoidal block 1801 is slidably connected with the pressing block 17, and the trapezoidal block 1801 is provided with two sets, when the steel coil is loaded into a vehicle, the pressing plate 16 drives the pressing block 18017 to push the trapezoidal block 1801 at the, the trapezoidal blocks 1801 and the connecting rods 1803 extend outwards to drive the movable plates 1806 on the mounting rack 1804 to rotate to abut against the outer side of the steel coil, so that the fixing effect on the steel coil is improved, the mounting rack 1804 is fixed at two ends of the outer side of the mounting seat 14, the fixing rods 1805 are fixed on the mounting rack 1804, the movable plates 1806 are connected on the fixing rods 1805 in a rotating manner, the connecting rods 1803 are connected at the bottoms of the movable plates 1806 in a rotating manner, the connecting rods 1803, the mounting rack 1804, the fixing rods 1805, the movable plates 1806, the third springs 1807 and the cover plates 1808 are respectively provided with two groups which are symmetrically arranged, when the steel coil is unloaded, the steel coil is lifted by the crane to be separated from the pressing plates 16, the two groups of trapezoidal blocks 1801 and the connecting rods 1803 are driven to inwardly enclose under the action of the elastic force of the second springs 1802, the connecting rods 1803 drive the movable plates 1806 on the, the convenience is loaded and unloaded the coil of strip, improves handling efficiency, and the top of fly leaf 1806 is fixed with third spring 1807, and is fixed with apron 1808 on the third spring 1807, and apron 1808 is the arc, and the top of the coil of strip of conveniently laminating compresses tightly the coil of strip on mount pad 14, and the elasticity effect of cooperation third spring 1807 reduces the vibration that the coil of strip produced in the transportation down, prevents that pressure is too big between the part from leading to damaging, improves life.

The working principle is as follows: when the steel coil fixing device convenient for loading and unloading is used for processing the color steel plate, firstly, the base 1 is fixed on a truck, then the motor 2 is started to drive the rotating shaft 3 and the first bevel gear 4 to rotate clockwise, the first bevel gear 4 rotates to drive the second bevel gear 5 on the screw rod 6 to rotate, simultaneously, the screw rod 6 is driven to rotate, simultaneously, the screw rod 6 drives the screwed pipes 7 at two ends to rotate, simultaneously, the limiting blocks 8 on the surfaces of the screwed pipes 7 are driven to slide on the limiting rods 9, so that the screwed pipes 7 move outwards on the screw rod 6, simultaneously, the fixing plate 10 is driven to move outwards, then, the steel coil is placed in the baffle 15 above the mounting seat 14 through a crane, the steel coil is placed on the mounting seat 14 and simultaneously supports against the pressing plate 16 on the mounting seat 14 under the weight pressure of the steel coil, the pressing plate 16 drives the pressing block 17 to descend to support against the trapezoidal block 1801 inside the mounting seat 14, so, the connecting rod 1803 moves outwards and drives the movable plate 1806 on the mounting rack 1804, so that the movable plate 1806 rotates on the fixed rod 1805 and abuts against the outer side of the steel coil, the steel coil is pressed on the mounting seat 14 by matching with the cover plate 1808 above the movable plate 1806, then the first hydraulic rod 11 inside the fixed plate 10 drives the slider 12 to move up and down to make the fixed pile 1301 aligned with the inner wall of the steel coil, then the motor 2 is turned on to drive the rotating shaft 3 and the first bevel gear 4 to rotate anticlockwise, the first bevel gear 4 rotates to drive the second bevel gear 5 to rotate and drive the lead screw 6 to rotate, the lead screw 6 rotates and drives the threaded pipes 7 at both ends to move towards the middle point of the lead screw 6, meanwhile, the fixed plate 10 is driven to enclose inwards to clamp both ends of the steel coil, then the second hydraulic rod 1302 inside the fixed pile 1301 on the slider 12 is opened to extend outwards to drive the movable block 1303 to abut against the top plate, the top plate 1305 is attached to the inner wall of a steel coil to fix the steel coil, the phenomenon of unstable jumping during transportation is prevented, the stability is improved, when the steel coil is unloaded, the pressure of the second hydraulic rod 1302 in the fixed pile 1301 is firstly relieved to drive the movable block 1303 to be separated from the movable plate 1304, the movable plate 1304 is driven to be contracted into the fixed pile 301 under the elastic action of the first spring 1307 on the fixed block 1306 in the fixed pile 1301, the top plate 1304 is driven to be contracted to be separated from the inner wall of the steel coil, the motor 2 is opened to drive the fixed frame 10 to be separated from the steel coil, then the steel coil is hoisted through the crane, the two groups of trapezoidal blocks 1801 are driven to be enclosed towards the middle point position of the mounting seat 14 under the elastic action of the second spring 1802 in the mounting seat 14, the trapezoidal blocks 1801 are contracted inwards to drive the connecting rod 1803 to be contracted, and simultaneously, the movable plate 1806 on the mounting seat 1804 is driven to rotate on the, the trapezoidal blocks 1801 contract and enclose and simultaneously abut against the pressing block 17 in the mounting seat 14 to lift the pressing block 17 and the pressing plate 16 for resetting, so that the subsequent use is convenient, the whole operation is completed, and the content which is not described in detail in the specification belongs to the prior art which is well known by a person skilled in the art.

The terms "central," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for simplicity of description only and are not intended to indicate or imply that the referenced devices or elements must be in a particular orientation, constructed and operative in a particular orientation, and are not to be considered limiting of the claimed invention.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.