阅读说明：本技术 一种折粒电阻筛料机构 (Roll over a resistance sieve material mechanism ) 是由 徐刚君 于 2021-07-02 设计创作，主要内容包括：本发明涉及物料筛分技术领域,且公开了一种折粒电阻筛料机构,包括进料斗、第一筛料装置、第二筛料装置,第一筛料装置为条形筛,条形筛上设有小于正常电阻的筛孔,条形筛通过振动机驱动震动,进料斗为扁平形,进料斗设置在条形筛一端上方,条形筛一端设有出料口,条形筛朝出料口倾斜设置,出料口下方设置第二筛料装置。本发明中,通过筛分机构的设计,在筛筒对物料进行筛分工作时,转盘通过连接组件带动筛筒进行倾斜位移,筛筒在位移时,并通过第一锥齿圈和第二锥齿圈,筛筒可进行旋转,使物料可以在筛筒内进行不断翻滚,且筛筒进行活动时,带动凸块和凸起进行不断接触发生震动,极大提高了筛筒内物料的活动频率,从而提高该筛料机构的筛分效率,并在斜刮板的作用下,在筛筒倾斜旋转过程中,斜刮板可对堵塞在筛网上的物料进行刮除,以此进一步提高筛分效率。(The invention relates to the technical field of material screening, and discloses a particle folding resistance screening mechanism which comprises a feeding hopper, a first screening device and a second screening device, wherein the first screening device is a bar-shaped screen, screen holes smaller than normal resistance are formed in the bar-shaped screen, the bar-shaped screen is driven to vibrate by a vibrating machine, the feeding hopper is flat, the feeding hopper is arranged above one end of the bar-shaped screen, a discharge hole is formed in one end of the bar-shaped screen, the bar-shaped screen is obliquely arranged towards the discharge hole, and the second screening device is arranged below the discharge hole. According to the screening mechanism, through the design of the screening mechanism, when the screening drum screens materials, the turntable drives the screening drum to perform inclined displacement through the connecting component, when the screening drum displaces, the screening drum can rotate through the first bevel gear ring and the second bevel gear ring, so that the materials can continuously roll in the screening drum, and when the screening drum moves, the lug and the bulge are driven to continuously contact and vibrate, so that the moving frequency of the materials in the screening drum is greatly improved, the screening efficiency of the screening mechanism is improved, and under the action of the inclined scraper, the inclined scraper can scrape the materials blocked on the screen cloth in the inclined rotation process of the screening drum, so that the screening efficiency is further improved.)

1. The utility model provides a roll over a resistance sieve material mechanism, includes feeder hopper, first sieve material device, second sieve material device, its characterized in that: first sieve material device is the bar sieve, be equipped with the sieve mesh that is less than normal resistance on the bar sieve, the bar sieve passes through the vibrator drive vibrations, the feeder hopper is the platykurtic, the feeder hopper sets up in bar sieve one end top, bar sieve one end is equipped with the discharge gate, the bar sieve sets up towards the discharge gate slope, the discharge gate below sets up second sieve material device.

2. The particle breaking resistance screening mechanism according to claim 1, characterized in that: the second sieve material device is the sieve that has vibrations mechanism, be equipped with the circular sieve mesh that only supplies normal resistance to pass through on the sieve, the sieve has thickness, sieve thickness H equals resistance length L15%, the sieve mesh upper edge is equipped with the corner cut.

3. The particle breaking resistance screening mechanism according to claim 2, characterized in that: the screening device comprises a bottom column (1), a mounting seat (5), a rotary table (2), a screening mechanism (6) and a connecting assembly (9), wherein the bottom column (1) is fixedly connected with the mounting seat (5), and the rotary table (2) is rotatably connected in the mounting seat (5);

screening mechanism (6) and carousel (2) are connected through coupling assembling (9) between, and are the acute angle setting between screening mechanism (6) and coupling assembling (9), screening mechanism (6) are including a sieve section of thick bamboo (63), the first bevel ring gear of table wall fixedly connected with (61) of a sieve section of thick bamboo (63), be provided with second bevel ring gear (7) on mount pad (5), first bevel ring gear (61) and second bevel ring gear (7) meshing are connected for when carousel (2) drive sieve section of thick bamboo (63) displacement, first bevel ring gear (61) and second bevel ring gear (7) produce rotatoryly to a sieve section of thick bamboo (63).

4. The particle breaking resistance screening mechanism according to claim 1, characterized in that: a servo motor (8) is fixed in the bottom column (1) through a bolt, and a rotating shaft of the servo motor (8) is fixedly connected with the turntable (2).

5. The particle breaking resistance screening mechanism according to claim 3, wherein: the top of carousel (2) still is provided with boss (3), fixedly connected with is protruding (31) on boss (3), lug (65) that fixedly connected with cooperation arch (31) used on sieve section of thick bamboo (63) for when sieve section of thick bamboo (63) are rotatory, lug (65) and arch (31) touch and produce vibrations.

6. The particle breaking resistance screening mechanism according to claim 5, wherein: the connecting assembly (9) comprises a telescopic sleeve (92) fixedly connected to the turntable (2), a telescopic rod (94) is connected to the telescopic sleeve (92) in a sliding mode, a connecting seat (91) is fixedly connected to the other end of the telescopic rod (94), the other end of the connecting seat (91) is arranged in an inclined plane, an inclined block (95) is fixedly connected to the inclined plane of the connecting seat (91), a rotating seat (96) is rotatably connected to the inclined block (95), the connecting assembly (9) is fixedly connected with the sieve cylinder (63) through the rotating seat (96), a spring (93) is further arranged between the turntable (2) and the connecting seat (91), and the spring (93) is sleeved on the telescopic sleeve (92);

fixedly connected with T type pivot (98) on sloping block (95), and T type pivot (98) perpendicular to sloping block (95), T type turn trough (97) have been seted up on roating seat (96), T type pivot (98) and T type turn trough (97) joint.

7. The particle breaking resistance screening mechanism according to claim 5, wherein: the lug (65) are provided with a plurality of lugs, the lugs (65) are annularly distributed on the screen drum (63), and the distance between every two adjacent lugs (65) is equal.

8. The particle breaking resistance screening mechanism according to claim 7, wherein: the bulges (31) are provided with a plurality of bulges (31), the bulges (31) are annularly distributed on the boss (3), and the distance between two adjacent bulges (31) is equal, so that the contact frequency of the bulges (65) and the bulges (31) is improved.

9. The particle breaking resistance screening mechanism according to claim 3, wherein: be provided with screen cloth (62) in screen cylinder (63), still rotate in screen cylinder (63) and be connected with rotatory piece (66), inclined scraper blade (64) that fixedly connected with cooperation screen cloth (62) used on rotatory piece (66).

10. The particle breaking resistance screening mechanism according to claim 3, wherein: fixedly connected with link (4) on mount pad (5), link (4) and second taper ring gear (7) fixed connection.

Technical Field

The invention relates to the technical field of material screening, in particular to a folded grain resistance screening mechanism.

Background

Vibrating screens are currently the most widely used screening machines in many industrial sectors. The vibrating screen has a rectangular screen box with a planar screen surface, as in the case of the shaker, but the screen box is supported (or suspended) on a frame by elastic elements and excited by an exciter, and is thus an elastic vibrating system whose amplitude can be varied under the influence of the feed and other dynamic factors. The vibrating screen has high vibration frequency, small amplitude and high material treating capacity and screening efficiency. The vibrating screen is suitable for grading of materials of various size grades and dewatering, desliming and medium removing of coal of medium and fine size grades. With the development of production and the progress of science and technology, a plurality of novel screening machines appear at home and abroad in recent years. The main uses in coal preparation plants are: vibrating probability sieves, rotating probability sieves, equal thickness sieves, probability equal thickness sieves, relaxation sieves, vertical cylindrical centrifugal sieves, spiral sieves, variable amplitude sieves and the like. In these screening machines, all the screening machines have a new structure and working principle except for the vibrating probability screen, the equal-thickness screen and the probability equal-thickness screen which belong to the new type of vibrating screen in view of motion characteristics.

Present most sieve material mechanism has certain defect when using, relies on the mode of vibrations mostly, improves the activity frequency of a sieve section of thick bamboo interior material to reach screening work and reduce the mesh that the screen cloth blockked up, but this kind of mode screening efficiency is very low, still can lead to the material through the screen cloth in-process, vibrations kick-back to the screen cloth in. The chip resistor has small volume and light weight, needs a large amount of time in the screening process, and has low screening efficiency.

Disclosure of Invention

The invention provides a particle folding resistance screening mechanism which has the beneficial effect of improving screening efficiency, and solves the problems that most of the existing screening mechanisms in the background art have certain defects when in use, the frequency of activity of materials in a screen cylinder is improved mostly by means of vibration, so that the purposes of screening work and reducing screen blockage are achieved, but the screening efficiency is very low by means of the mode, and the materials can rebound to the screen by means of vibration in the process of passing through the screen.

The invention provides the following technical scheme: the utility model provides a roll over a grain resistance sieve material mechanism, includes feeder hopper, first sieve material device, second sieve material device, and first sieve material device is the bar sieve, is equipped with the sieve mesh that is less than normal resistance on the bar sieve, and the bar sieve passes through the bobbing machine drive vibrations, and the feeder hopper is the platykurtic, and the feeder hopper setting is in bar sieve one end top, and bar sieve one end is equipped with the discharge gate, and the bar sieve sets up towards the slope of discharge gate, and the discharge gate below sets up second sieve material device. The second sieve material device is the sieve that has vibrations mechanism, is equipped with the circular sieve mesh that only supplies normal resistance to pass through on the sieve, and the sieve has thickness, and sieve thickness H equals resistance length L15%, and the sieve mesh is gone up along being equipped with the corner cut.

The screening device comprises a bottom column, a mounting seat, a rotary table, a screening mechanism and a connecting assembly, wherein the bottom column is fixedly connected with the mounting seat, and the rotary table is rotatably connected in the mounting seat;

screening mechanism and carousel between be connected through coupling assembling, and be the acute angle setting between screening mechanism and the coupling assembling, screening mechanism includes a sieve section of thick bamboo, the first bevel gear ring of table wall fixedly connected with of a sieve section of thick bamboo is provided with the second taper ring gear on the mount pad, first bevel gear ring and second taper ring gear meshing are connected for when the carousel drives a sieve section of thick bamboo displacement, first bevel gear ring and second taper ring gear produce rotatoryly to a sieve section of thick bamboo.

As an alternative of the granular resistor screening mechanism of the present invention, wherein: a servo motor is fixed in the bottom column through a bolt, and a rotating shaft of the servo motor is fixedly connected with the rotary table.

As an alternative of the broken grain resistance screening mechanism of the invention, wherein: the top of carousel still is provided with the boss, fixedly connected with is protruding on the boss, fixedly connected with cooperates the protruding lug of using of arch on the sieve section of thick bamboo for when a sieve section of thick bamboo is rotatory, lug and protruding touching produce vibrations.

As an alternative of the broken grain resistance screening mechanism of the invention, wherein: the connecting assembly comprises a telescopic sleeve fixedly connected to the rotary table, a telescopic rod is connected in the telescopic sleeve in a sliding mode, the other end of the telescopic rod is fixedly connected with a connecting seat, the other end of the connecting seat is arranged in an inclined plane, an inclined block is fixedly connected to the inclined plane of the connecting seat, a rotating seat is rotatably connected to the inclined block, the connecting assembly is fixedly connected with the sieve cylinder through the rotating seat, a spring is further arranged between the rotary table and the connecting seat, and the spring is sleeved on the telescopic sleeve;

wherein: fixedly connected with T type pivot on the sloping block, and T type pivot perpendicular to sloping block, the T type turn trough has been seted up on the roating seat, T type pivot and T type turn trough joint.

As an alternative of the broken grain resistance screening mechanism of the invention, wherein: the lug is provided with a plurality of altogether, and a plurality of lug is the annular and distributes on a sieve section of thick bamboo, and the interval between two adjacent lugs equals.

As an alternative of the broken grain resistance screening mechanism of the invention, wherein: the bulges are provided with a plurality of bulges which are distributed on the lug boss in an annular mode, and the distance between every two adjacent bulges is equal, so that the contact frequency of the lugs and the bulges is improved.

As an alternative of the broken grain resistance screening mechanism of the invention, wherein: the screen is arranged in the screen cylinder, the screen cylinder is further rotatably connected with a rotating block, and an inclined scraper matched with the screen is fixedly connected to the rotating block.

As an alternative of the broken grain resistance screening mechanism of the invention, wherein: the mounting seat is fixedly connected with a connecting frame, and the connecting frame is fixedly connected with the second taper gear ring.

As an alternative of the broken grain resistance screening mechanism of the invention, wherein: the first material screening device is communicated with the second material screening device, the second material screening device is communicated with the screen drum through a hose, and the joint is fixed through a bearing.

The invention has the following beneficial effects:

1. and (3) screening the resistance dynamic state by using a bar-shaped screen, and screening out most of small defective products in the movement process.

2. This roll over grain resistance sieve material mechanism, design through screening mechanism, at a sieve section of thick bamboo screening work to the material, the carousel drives a sieve section of thick bamboo through coupling assembling and carries out the displacement of inclining, a sieve section of thick bamboo is when the displacement, and through first bevel ring and second bevel ring, a sieve section of thick bamboo can rotate, make the material constantly roll in a sieve section of thick bamboo, and a sieve section of thick bamboo when moving about, it shakes to drive lug and arch and constantly contact the emergence, the activity frequency of material in a sieve section of thick bamboo has greatly been improved, thereby improve the screening efficiency of this sieve material mechanism, and under the effect of oblique scraper blade, at a sieve section of thick bamboo rotation of inclining in-process, oblique scraper blade can strike off the material of jam on the screen cloth, with this further improvement screening efficiency.

3. This roll over grain resistance sieve material mechanism through coupling assembling's design, when a sieve section of thick bamboo shakes, the telescopic link can provide the activity space to a sieve section of thick bamboo to reduce a sieve section of thick bamboo at the vibrations in-process, can drive the condition that whole mechanism carries out vibrations, and under the effect of spring, can carry out the shock attenuation of certain extent to screening mechanism vibrations in-process, effectively improved the stability of this sieve material mechanism.

Drawings

Fig. 1 is a perspective view of a particle-folding resistor screening mechanism provided by the invention.

Fig. 2 is a perspective view of a screening device of a particle folding resistor screening mechanism provided by the invention.

Fig. 3 is a schematic structural diagram of a material sieving device of a particle-folding resistor material sieving mechanism provided by the invention.

Fig. 4 is a schematic structural diagram of a screening mechanism of a grain folding resistor screening mechanism according to the present invention.

In the figure: 1. a bottom pillar; 2. a turntable; 3. a boss; 31. a protrusion; 4. a connecting frame; 5. a mounting seat; 6. a screening mechanism; 61. a first bevel ring gear; 62. screening a screen; 63. a screen cylinder; 64. an inclined scraper; 65. a bump; 66. rotating the block; 7. a second bevel gear ring; 8. a servo motor; 9. a connecting assembly; 91. a connecting seat; 92. a telescopic sleeve; 93. a spring; 94. a telescopic rod; 95. a sloping block; 96. a rotating base; 97. t-shaped rotary grooves; 98. a T-shaped rotating shaft; 10. a feed hopper; 11. A material screening device; 12. a first screening device; 121. a bar screen; 13. and the second screening device.

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.

Example 1

Referring to fig. 1-3, a particle-folding resistor screening mechanism includes a feeding hopper 10, a first screening device 12, and a second screening device 13, and is characterized in that: first sieve material device 12 is the bar sieve, and the bar is sieved and is equipped with the sieve mesh that is less than normal resistance, and the bar is sieved and is passed through the vibrations of bobbing machine drive, and the feeder hopper is the platykurtic, and the feeder hopper setting is in bar sieve one end top, and bar sieve one end is equipped with the discharge gate, and the bar is sieved towards the slope of discharge gate setting, and the discharge gate below sets up second sieve material device.

The second sieve material device is the sieve that has vibrations mechanism, is equipped with the circular sieve mesh that only supplies normal resistance to pass through on the sieve, and the sieve has thickness, and sieve thickness H equals resistance length L15%, and the sieve mesh is gone up along being equipped with the corner cut. The screening device comprises a bottom column 1, a mounting seat 5, a rotary table 2, a screening mechanism 6 and a connecting assembly 9, wherein the bottom column 1 is fixedly connected with the mounting seat 5, and the rotary table 2 is rotatably connected in the mounting seat 5;

screening mechanism 6 and carousel 2 are connected through coupling assembling 9 between, and be the acute angle setting between screening mechanism 6 and the coupling assembling 9, screening mechanism 6 includes a sieve section of thick bamboo 63, the first bevel gear circle 61 of the table wall fixedly connected with of sieve section of thick bamboo 63, be provided with second bevel gear circle 7 on the mount pad 5, first bevel gear circle 61 and second bevel gear circle 7 meshing are connected for when carousel 2 drives sieve section of thick bamboo 63 displacement, first bevel gear circle 61 and second bevel gear circle 7 produce rotatoryly to a sieve section of thick bamboo 63.

Additionally, the connecting frame 4 is fixedly connected to the mounting seat 5, and the connecting frame 4 is fixedly connected with the second bevel gear ring 7.

The acute angle between the sifting mechanism 6 and the connecting assembly 9 is provided for the purpose of tilting the sifter cylinder 63, and the tilting angle is determined by the normal meshing connection of the first bevel ring gear 61 and the second bevel ring gear 7, and the normal contact of the protrusion 31 and the projection 65.

Through the rotation of carousel 2, carousel 2 drives coupling assembling 9 and rotates, coupling assembling 9 drives screening mechanism 6 and carries out the annular displacement of tilt state, screening mechanism 6 carries out the displacement in-process, a sieve section of thick bamboo 63 carries out the annular through second taper ring gear 7 and walks around in first taper ring gear 61, make a sieve section of thick bamboo 63 when the tilt state displacement, a sieve section of thick bamboo 63 can also carry out rotary motion, constantly roll in order to drive the material in a sieve section of thick bamboo 63, improve the movable frequency of material in this screening mechanism 6.

Example 2

The embodiment is an improvement made on the basis of the embodiment 1, and specifically, with reference to fig. 2, a servo motor 8 is fixed in the bottom column 1 through a bolt, and a rotating shaft of the servo motor 8 is fixedly connected with the turntable 2.

When this sieve material mechanism carries out the during operation, carry out electric connection with servo motor 8 and power, servo motor 8's axis of rotation drives carousel 2 and rotates this moment.

Example 3

The embodiment is an improvement on the basis of embodiment 1, and specifically, with reference to fig. 1-2, a boss 3 is further disposed above the turntable 2, a protrusion 31 is fixedly connected to the boss 3, and a protrusion 65 used in cooperation with the protrusion 31 is fixedly connected to the screen drum 63, so that when the screen drum 63 rotates, the protrusion 65 and the protrusion 31 touch to generate vibration.

When a sieve section of thick bamboo 63 carries out annular rotary motion, a sieve section of thick bamboo 63 drives lug 65 simultaneously and rotates, makes lug 65 and arch 31 carry out constantly contacting and produces vibrations to drive a sieve section of thick bamboo 63 and shake, a sieve section of thick bamboo 63 drives the material and shakes, with this effect that remains vibration screening among the prior art.

Example 4

The embodiment is an improvement made on the basis of embodiment 3, and specifically, with reference to fig. 2-3, the connection assembly 9 includes a telescopic tube 92 fixedly connected to the turntable 2, a telescopic rod 94 is slidably connected in the telescopic tube 92, the other end of the telescopic rod 94 is fixedly connected to the connection seat 91, the other end of the connection seat 91 is arranged in an inclined plane, the inclined plane of the connection seat 91 is fixedly connected to an inclined block 95, the inclined block 95 is rotatably connected to a rotary seat 96, the connection assembly 9 is fixedly connected to the sieve tube 63 through the rotary seat 96, a spring 93 is further disposed between the turntable 2 and the connection seat 91, and the spring 93 is sleeved on the telescopic tube 92;

wherein: the T-shaped rotating shaft 98 is fixedly connected to the inclined block 95, the T-shaped rotating shaft 98 is perpendicular to the inclined block 95, the T-shaped rotating groove 97 is formed in the rotating base 96, and the T-shaped rotating shaft 98 is connected with the T-shaped rotating groove 97 in a clamping mode.

When a sieve section of thick bamboo 63 shakes, a sieve section of thick bamboo 63 drives sloping block 95 through roating seat 96 and moves about, sloping block 95 drives telescopic link 94 and moves about, telescopic link 94 can carry out the regulation of certain within range in telescopic tube 92, make and can form a space of activity that is applicable to a sieve section of thick bamboo 63 between telescopic link 94 and the telescopic tube 92, in order to reduce a sieve section of thick bamboo 63 at vibrations in-process, can drive the condition that whole mechanism carries out vibrations, under spring 93's effect, can carry out the shock attenuation of certain within range to screening mechanism 6 vibrations in-process, and provide certain supporting effect to telescopic link 94 and telescopic tube 92.

When the screen drum 63 rotates, the screen drum 63 drives the rotating base 96 to rotate, and the rotating base 96 makes axial rotating motion relative to the T-shaped rotating shaft 98 through the T-shaped rotating groove 97, so that the screen drum 63 can make oblique axial rotating motion.

When the screen drum 63 is rotated, the entire inclined rotation movement of the screening mechanism 6 can be performed by the connecting base 91.

Example 5

The present embodiment is an improvement made on the basis of embodiment 3, specifically, in combination with fig. 2 to 3, a plurality of bumps 65 are provided, the plurality of bumps 65 are annularly distributed on the screen drum 63, and the intervals between two adjacent bumps 65 are equal.

Further, the plurality of protrusions 31 are arranged, the plurality of protrusions 31 are annularly distributed on the boss 3, and the distance between two adjacent protrusions 31 is equal, so that the contact frequency between the protrusion 65 and the protrusion 31 is improved.

When a sieve section of thick bamboo 63 carries out annular motion, also carry out the surrounding movement relatively boss 3, and a sieve section of thick bamboo 63 drives lug 65 and encircles boss 3 and when moving, also drives a plurality of lug 65 simultaneously and rotates, and a plurality of lug 65 can constantly rotate to contact with a plurality of arch 31 of annular distribution on boss 3, improve the frequency of vibration of this sieve material mechanism to the material with this, thereby improve the frequency of activity of material in a sieve section of thick bamboo 63.

Example 6

The present embodiment is an improvement made on the basis of embodiment 1, and specifically, with reference to fig. 2 to 3, a screen 62 is disposed in a screen drum 63, a rotating block 66 is further rotatably connected in the screen drum 63, and an inclined scraper 64 used in cooperation with the screen 62 is fixedly connected to the rotating block 66.

In the inclined rotation process of the screen drum 63, the inclined scraper 64 rotates in the screen drum 63 through the rotating block 66 due to the inclined surface of the screen drum 63 and the weight of the inclined scraper 64, so that the inclined scraper 64 can be constantly positioned at a lower horizontal line, and when materials are constantly rolled on the screen 62, the materials are also positioned at a lower horizontal plane, so that the inclined scraper 64 can be constantly contacted with the materials, and the inclined scraper 64 can also scrape the materials blocked on the screen 62, thereby further improving the screening efficiency.

Example 7

The embodiment is an improvement on embodiment 1, and specifically, with reference to fig. 1, the first material sieving device 12 is communicated with the second material sieving device 13, the second material sieving device 13 is in communication connection with the sieve drum 63 through a hose, and the connection is fixed through a bearing.

When using this sieve material mechanism, first sieve material device 12 gives the material to second sieve material device 13, and second sieve material device 13 gives the material through the hose and gives sieve section of thick bamboo 63 on sieve material device 11, carries out screening work, when sieve section of thick bamboo 63 rotates, drives the hose and rotates, and under the effect of bearing, the hose also possesses certain rotation regulation ability, when in order to adapt to sieve section of thick bamboo 63 and drive the hose activity, reduce the influence when receiving sieve section of thick bamboo 63 and rotate.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.