阅读说明：本技术 一种矿山生产安全用预警设备 (Early warning equipment is used to mine production safety ) 是由 邓家建 于 2021-07-20 设计创作，主要内容包括：本发明公开了一种矿山生产安全用预警设备,其结构包括预警器、扶手柄、转动柄、固定座,预警器后端与扶手柄末端焊接连接,扶手柄下端与转动柄整体间隙配合,转动柄内部与预警器内部活动配合,预警器下端与固定座顶部焊接连接,预警器包括驱动器、扩声罩、空鸣腔,驱动器外端与空鸣腔内侧间隙配合,本发明通过辅助盘在三角导盘的带动下使其增速盘进行旋转,在设备运作时内部的阻磁拉片被触发钩卡合拉出,脱离对永磁块的覆盖,从而与内侧的磁石块形成同性相斥磁场,辅助其增速盘的旋转,同时设备旋转起来更加轻松,短时间人员走开警报器也不会停止响声,有效解决了持续转动下需要消耗大量维持预警提示音声响的问题。(The invention discloses an early warning device for mine production safety, which structurally comprises an early warning device, a handrail handle, a rotating handle and a fixed seat, wherein the rear end of the early warning device is welded and connected with the tail end of the handrail handle, the lower end of the handrail handle is in clearance fit with the rotating handle integrally, the inner part of the rotating handle is in movable fit with the inner part of the early warning device, the lower end of the early warning device is welded and connected with the top of the fixed seat, the early warning device comprises a driver, a sound expanding cover and a hollow sounding cavity, the outer end of the driver is in clearance fit with the inner side of the hollow sounding cavity, an auxiliary disc is driven by a triangular guide disc to rotate an accelerating disc, when the equipment is operated, the internal magnetism-resisting pulling piece is clamped and pulled out by the trigger hook and is separated from covering the permanent magnet blocks, thereby form like-pole repelling magnetic field with inboard magnetite piece, supplementary its acceleration rate dish's rotation, equipment is rotatory lighter simultaneously, and short time personnel walk away the siren and also can not stop the sound, have effectively solved and have lasted the problem that need consume a large amount of early warning prompt tone sound that maintain under the rotation.)

1. The utility model provides a mine is early warning equipment for production safety, its structure includes precaution device (1), handrail handle (2), rotation handle (3), fixing base (4), end welded connection of precaution device (1) rear end and handrail handle (2), handrail handle (2) lower extreme and the whole clearance fit of rotation handle (3), rotate inside and the inside clearance fit of precaution device (1) of handle (3), precaution device (1) lower extreme and fixing base (4) top welded connection, its characterized in that:

the early warning device (1) comprises a driver (11), a sound amplification cover (12) and an air sounding cavity (13), wherein the outer end of the driver (11) is in clearance fit with the inner side of the air sounding cavity (13), the inner side of the sound amplification cover (12) is in clearance fit with the whole air sounding cavity (13), and the outer end of the driver (11) is in clearance fit with the inner side of the sound amplification cover (12).

2. The early warning device for mine production safety as recited in claim 1, wherein: driver (11) are including supplementary dish (111), power fluted disc (112), triangle guide plate (113), supplementary dish (111) inner wall is connected with triangle guide plate (113) surface meshing, triangle guide plate (113) center is connected with power fluted disc (112) surface meshing, power fluted disc (112) outer end and the inboard clearance fit of supplementary dish (111).

3. The early warning device for mine production safety as recited in claim 2, wherein: supplementary dish (111) are including increasing speed dish (a1), magnet piece (a2), the dish body (a3), trigger hook (a4), increasing speed dish (a1) inboard and dish body (a3) are whole to cooperate between, dish body (a3) surface is connected with the whole embedded solid of trigger hook (a4), trigger hook (a4) both sides and the whole clearance fit of magnet piece (a2), trigger hook (a4) surface and increasing speed dish (a1) inner wall clearance fit.

4. The early warning device for mine production safety as recited in claim 3, wherein: the speed increasing disc (a1) comprises attraction blocks (a11), permanent magnets (a12) and a magnetic resistance pull piece (a13), wherein the two sides of the attraction blocks (a11) are in clearance fit with the side walls of the permanent magnets (a12), the surfaces of the permanent magnets (a12) are integrally connected with the magnetic resistance pull piece (a13) in a nested manner, and the outer side of the magnetic resistance pull piece (a13) is in clearance fit with the attraction blocks (a11) integrally.

5. The early warning device for mine production safety as recited in claim 1, wherein: the sound amplifying cover (12) comprises a sound amplifying groove (121), a cover body (122) and an anti-falling block (123), the whole sound amplifying groove (121) is fixedly embedded in the surface of the cover body (122), the inner wall of the cover body (122) is connected with the top end of the anti-falling block (123) in a clamping mode, and the inner side of the anti-falling block (123) is movably clamped with the inner wall of the sound amplifying groove (121).

6. The early warning device for mine production safety as recited in claim 5, wherein: the sound amplifying groove (121) comprises a sound returning cylinder (b1), a groove wall (b2) and an outer expanding cavity (b3), the inner side of the sound returning cylinder (b1) is fixedly embedded with the inner surface of the groove wall (b2), the inner part of the groove wall (b2) is in integral movable fit with the outer expanding cavity (b3), and the two sides of the outer expanding cavity (b3) are in integral movable fit with the sound returning cylinder (b 1).

7. The early warning device for mine production safety as recited in claim 6, wherein: the utility model discloses a novel sound tube (b) is characterized in that sound tube (b1) includes sound tube (b11), sound-proof wall (b12), sound inlet (b13), spiral pipe (b14), sound tube (b11) lower extreme and spiral pipe (b14) top welded connection, the whole inside block of spiral pipe (b14) and sound-proof wall (b12) is connected, sound-proof wall (b12) bottom and sound inlet (b13) are whole nested connection, sound inlet (b13) upper end and the inside clearance fit of sound tube (b 11).

8. The early warning device for mine production safety as recited in claim 7, wherein: the echo tube (b11) comprises an acoustic plastic sheet (c1), a cross through seat (c2) and an acoustic guide cavity (c3), the tail end of the acoustic plastic sheet (c1) is fixedly embedded with the surface of the cross through seat (c2), the cross through seat (c2) is integrally and fixedly embedded with the inner wall of the acoustic guide cavity (c3), and the acoustic guide cavity (c3) is internally and movably matched with the acoustic plastic sheet (c1) integrally.

Technical Field

The invention relates to the technical field of mine production safety, in particular to early warning equipment for mine production safety.

Background

The production safety is an important component in enterprise management, and is an important guarantee for the life safety, physical and psychological health of workers and the normal and continuous production of enterprises, in the production safety of mines, the safety management and the production management are inseparable, and the necessity of the safety management lies in the effect of protecting main constructors, production equipment and enterprises of productivity;

however, the prior art has the following defects: the current early warning equipment for mine production safety indicates hand-operated siren, then the sound effect of siren has been decided to hand-operated rotational speed, under the noisy sound of mine internal plant, need improve the sound of alarm by the rotation that personnel lasted to lead to equipment to have the power of discharge then just can not reach due sound effect in the use slightly, the alarm sound scope dwindles, and then cause equipment to reach the warning suggestion effect of continuation.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide the early warning equipment for the mine production safety, and the early warning equipment for the mine production safety in the prior art is used for solving the problems that the prior early warning equipment for the mine production safety is a hand-operated alarm, the sound effect of the alarm is determined by the hand-operated rotating speed, and the sound of the alarm needs to be improved by the continuous rotation of personnel under the noisy sound of equipment in a mine, so that the due sound effect cannot be achieved when the equipment is slightly discharged in the using process, the alarm sound range is reduced, and the continuous early warning prompting effect cannot be achieved by the equipment.

In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides an early warning equipment is used to mine production safety, its structure includes precaution device, handrail handle, rotation handle, fixing base, precaution device rear end and the terminal welded connection of handrail handle, handrail handle lower extreme and the whole clearance fit of rotation handle, the inside and the inside clearance fit of precaution device of rotation handle, precaution device lower extreme and fixing base top welded connection, the precaution device includes driver, sound amplification cover, empty chamber of singing, the driver outer end and the inboard clearance fit in empty chamber of singing, sound amplification cover inboard and the whole clearance fit in empty chamber of singing, the driver outer end with sound amplification cover inboard clearance fit.

The invention is further improved, the driver comprises an auxiliary disc, a power fluted disc and a triangular guide disc, the inner wall of the auxiliary disc is meshed and connected with the surface of the triangular guide disc, the center of the triangular guide disc is meshed and connected with the surface of the power fluted disc, the outer end of the power fluted disc is in clearance fit with the inner side of the auxiliary disc, the triangular guide disc is integrally in an equilateral triangle shape and is distributed on the inner side of the auxiliary disc, and the inner side surface is meshed and connected with a gear below the triangular guide disc.

The auxiliary disc comprises a speed increasing disc, magnet blocks, a disc body and trigger hooks, wherein the inner side of the speed increasing disc is matched with the whole disc body, the surface of the disc body is integrally and fixedly connected with the trigger hooks, the two sides of each trigger hook are in clearance fit with the magnet blocks, the surface of each trigger hook is in movable fit with the inner wall of the speed increasing disc, the number of the trigger hooks is six, the trigger hooks are distributed on the surface of the disc body, the bottom of each trigger hook is in welded connection with the surface of the disc body, and the two sides of each trigger hook are in clearance fit with the magnet blocks.

The invention is further improved, the speed increasing disc comprises a mutual attraction block, permanent magnets and a magnetic resistance pulling piece, wherein two sides of the mutual attraction block are in clearance fit with the side walls of the permanent magnets, the surfaces of the permanent magnets are integrally nested and connected with the magnetic resistance pulling piece, the outer side of the magnetic resistance pulling piece is in clearance fit with the whole of the mutual attraction block, the magnetic resistance pulling piece is distributed on the surfaces of the permanent magnets and is nested and connected with the surfaces of the permanent magnets, and a hook is arranged at the top of the magnetic resistance pulling piece and is movably clamped with an upper end structure.

The invention is further improved, the sound amplifying cover comprises a sound amplifying groove, a cover body and an anti-falling block, the whole sound amplifying groove is fixedly embedded in the surface of the cover body, the inner wall of the cover body is clamped and connected with the top end of the anti-falling block, the inner side of the anti-falling block is movably clamped and connected with the inner wall of the sound amplifying groove, the whole sound amplifying groove is in an outer eight shape and is embedded in the surface of the cover body, and the two sides of the sound amplifying groove are clamped and connected with the anti-falling block.

The invention is further improved, the sound amplifying groove comprises two echo cylinders, two groove walls and two outward-expanding cavities, the inner sides of the echo cylinders are fixedly connected with the inner surfaces of the groove walls in an embedded mode, the inner parts of the groove walls are integrally and movably matched with the outward-expanding cavities, two sides of the outward-expanding cavities are integrally and movably matched with the echo cylinders, the two echo cylinders are distributed on the inner surfaces of the groove walls and fixedly connected with the inner surfaces of the groove walls in an embedded mode, and the integral top and the outward-expanding cavities are on the same horizontal line.

The invention is further improved, the echo tube comprises an echo tube, a sound insulation wall, a sound inlet and a spiral tube, the lower end of the echo tube is connected with the top of the spiral tube in a welding mode, the spiral tube is integrally connected with the inside of the sound insulation wall in a clamping mode, the bottom of the sound insulation wall is integrally connected with the sound inlet in a nesting mode, the upper end of the sound inlet is movably matched with the inside of the echo tube, the spiral tube is normally a spiral hollow tube, the outer end of the spiral tube is connected with the inner side of the sound insulation wall in a clamping mode, and the top of the spiral tube is connected with the left lower end of the echo tube in a welding mode.

The invention is further improved, the sound returning pipe comprises a sound changing plastic sheet, a cross through seat and a sound guide cavity, the tail end of the sound changing plastic sheet is fixedly connected with the surface of the cross through seat, the whole cross through seat is fixedly connected with the inner wall of the sound guide cavity, the interior of the sound guide cavity is movably matched with the whole sound changing plastic sheet, and the whole sound changing plastic sheet is in an arc strip sheet shape, is distributed on the surface of the cross through seat, is fixedly connected and is movably matched with the interior of the sound guide cavity.

Advantageous effects

Compared with the prior art, the invention has the following beneficial effects;

1. the auxiliary disc is driven by the triangular guide disc to rotate the accelerating disc, the magnetic-resisting pull piece in the auxiliary disc is clamped and pulled out by the trigger hook when the equipment runs and is separated from the permanent magnet blocks, so that a magnetic field with the same polarity as that of the magnet blocks on the inner side is formed, the rotation of the accelerating disc is assisted, the equipment is easier to rotate, a person walks away from the alarm in a short time and cannot stop sounding, and the problem that a large amount of warning prompt sound is consumed to maintain sounding under continuous rotation is effectively solved.

2. The invention amplifies the early warning prompt sound formed by internal equipment through the sound amplifying cover, so that part of the sound formed inside enters the echo cylinder to form the promotion alarm sound with penetrability and thickness under the assistance of the spiral pipe, and the sound-changing plastic sheet in the echo pipe at the top is matched to change the promotion sound of the alarm and also can play the roles of penetrability and sound amplification, thereby effectively solving the problems that the early warning prompt cannot be realized at the first time due to the limited transmission range and the weak penetrability of the early warning prompt sound.

Drawings

Fig. 1 is a schematic structural diagram of an early warning device for mine production safety of the present invention.

Fig. 2 is a schematic diagram of the internal structure of the early warning device of the invention.

Fig. 3 is a schematic diagram of the internal structure of the driver of the present invention.

Fig. 4 is a schematic view of the internal structure of the auxiliary plate of the present invention.

Fig. 5 is a schematic view of the internal structure of the speed increasing disk of the invention.

Fig. 6 is a schematic view of the internal structure of the sound-expanding cover of the present invention.

Fig. 7 is a schematic view of the internal structure of the sound amplifying groove of the present invention.

Fig. 8 is a schematic view of the internal structure of the echo cartridge of the present invention.

Fig. 9 is a schematic view of the internal structure of the echo tube according to the present invention.

In the figure: the device comprises a pre-warning device-1, an armrest handle-2, a rotating handle-3, a fixed seat-4, a driver-11, a sound amplifying cover-12, a hollow sounding cavity-13, an auxiliary disk-111, a power fluted disk-112, a triangular guide disk-113, a speed increasing disk-a 1, a magnet block-a 2, a disk body-a 3, a trigger hook-a 4, a suction block-a 11, a permanent magnet block-a 12, a magnetic resistance pull tab-a 13, a sound amplifying groove-121, a cover body-122, an anti-dropping block-123, an echo tube-b 1, a groove wall-b 2, an outer expanding cavity-b 3, an echo tube-b 11, a sound insulation wall-b 12, a sound inlet-b 13, a spiral tube-b 14, a sound-changing plastic sheet-c 1, a cross through seat-c 2 and a sound guide cavity-c 3.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, not all embodiments of the present invention, and all other embodiments obtained by those skilled in the art without any inventive work based on the embodiments of the present invention belong to the protection scope of the present invention.

The invention is further described below with reference to the accompanying drawings:

example 1

As shown in figures 1 to 5:

its structure includes early warning ware 1, handrail handle 2, rotation handle 3, fixing base 4, 1 rear end of early warning ware and 2 terminal welded connection of handrail handle, 2 lower extremes of handrail handle and the whole clearance fit of rotation handle 3, 3 inside and the 1 inside clearance fit of early warning ware of rotation handle, 1 lower extreme of early warning ware and 4 top welded connection of fixing base, early warning ware 1 includes driver 11, expands sound cover 12, empty chamber 13 that sounds, 11 outer ends of driver and the inboard clearance fit in empty chamber 13 that sounds, expand the 12 inboard and the whole clearance fit in empty chamber 13 that sounds of sound cover, 11 outer ends of driver and the inboard clearance fit in the sound cover 12 that expands.

Wherein, the driver 11 includes auxiliary disc 111, power fluted disc 112, triangle guide disc 113, auxiliary disc 111 inner wall is connected with the meshing of triangle guide disc 113 surface, the meshing of triangle guide disc 113 center and power fluted disc 112 surface is connected, power fluted disc 112 outer end and the inboard clearance fit of auxiliary disc 111, triangle guide disc 113 is whole to be equilateral triangle, distributes in auxiliary disc 111 inboardly, and the internal side surface is connected with the meshing of gear under the triangle guide disc 113, and wherein power fluted disc 112 is favorable to being equipped with its whole rather than the air formation pressure flow, makes a sound to produce the alarm sound, reach the effect of early warning suggestion.

The auxiliary disc 111 comprises a speed increasing disc a1, a magnet block a2, a disc body a3 and a trigger hook a4, the inner side of the speed increasing disc a1 is matched with the disc body a3 integrally, the surface of the disc body a3 is fixedly connected with the trigger hook a4 integrally, two sides of the trigger hook a4 are in clearance fit with the magnet block a2 integrally, the surface of the trigger hook a4 is in movable fit with the inner wall of the speed increasing disc a1, six trigger hooks a4 are arranged and distributed on the surface of the disc body a3, the bottom of the disc body a3 is in welded connection with the surface of the disc body, and the two sides of the disc body and the magnet block a2 form clearance fit, wherein the trigger hooks a4 are beneficial to trigger the internal structure of the speed increasing disc a1 so as to be matched with the magnet block a2 to achieve the effect of increasing the speed of the speed increasing disc a1, and the conventional output problem of the lasting force of personnel is changed.

Wherein the speed increasing disk a1 comprises a attraction block a11, a permanent magnet a12 and a magnetism resisting pull tab a13, the two sides of the attraction block a11 are in clearance fit with the side wall of the permanent magnet a12, the surface of the permanent magnet a12 is integrally nested and connected with the magnetism-resisting pull tab a13, the outer side of the magnetic resistance pull tab a13 is in clearance fit with the attraction block a11 as a whole, the magnetic resistance pull tab a13 is distributed on the surface of the permanent magnet block a12, is nested and connected with the surface of the steel pipe, the top of the steel pipe is provided with a hook which is movably clamped with the upper end structure, wherein the permanent magnet a12 is beneficial to emit corresponding magnetism to form a repelling magnetic field with the front end magnet, the other end is displaced forwards under the attraction of the attraction block a11, the phase change has directional attraction, the repelling magnetic field formed by the permanent magnet a12 is matched, so that the large and small force output of an operator is reduced, the operator can rotate more easily, and meanwhile, the person can not stop sounding when the person walks away from the alarm in a short time at a certain rotating speed.

The specific working principle is as follows:

the invention fixes the fixed seat 4 at the appointed position, rotates the rotating handle 3 by holding the handle 2 with force by an operator, so that the early warning device 1 gives out early warning prompt, the driver 11 inside is driven by the rotating handle 3 after rotating, and the internal hollow sound cavity 13 compresses the air, so as to give out warning sound, then the warning sound is spread out by the sound-expanding cover 12, so that the auxiliary disc 111 is driven by the power fluted disc 112 to be changed and driven by the triangular guide disc 113, the triggering hook a4 on the surface of the disc body a3 pulls out the magnetic-resisting pull piece a13 in the speed-increasing disc a1 forwards, the permanent magnet a12 leaks outside, the magnet block a2 embedded with the surface of the disc body a3 forms like-polarity repelling magnetic field, the magnetic block a11 is matched with the attraction of the attraction block a13 to be used as the attraction guide of the magnetic block a2, thus saving part of the operator's force in the rotating process, and simultaneously the rotating handle rotates more easily after rotating to a certain rotating speed, meanwhile, under a certain rotating speed, the person walks away the alarm in a short time and cannot stop sounding, the auxiliary disc 111 is driven by the triangular guide disc 113 to rotate the speed increasing disc a1, the magnetic-resisting pull piece in the auxiliary disc is clamped and pulled out by the trigger hook a4 when the equipment operates and is separated from the permanent magnet block a12, so that a magnetic field with the same polarity as that of the magnet block a12 on the inner side is formed, the rotation of the speed increasing disc a1 is assisted, the equipment rotates more easily, the person walks away the alarm in a short time and cannot stop sounding, and the problem that a large amount of warning prompting sound needs to be consumed and maintained under the condition of continuous rotation is effectively solved.

Example 2:

as shown in fig. 6 to 9:

wherein, the sound amplifying cover 12 includes sound amplifying groove 121, cover body 122, anticreep piece 123, sound amplifying groove 121 is whole to be connected with cover body 122 surface embedded solid, cover body 122 inner wall is connected with anticreep piece 123 top block, anticreep piece 123 inboard and public address groove 121 inner wall activity block, sound amplifying groove 121 is whole to be outer eight, and the embedded solid is on cover body 122 surface, and both sides carry out the block with anticreep piece 123 and are connected, and wherein sound amplifying groove 121 is favorable to the early warning suggestion alarm sound that the increase equipment sent to make the inside early warning suggestion of hearing that can be timely of the operator of production in the mine, thereby the early warning measure that corresponds is made to the very first time.

Wherein, the sound amplifying groove 121 includes sound returning cylinder b1, cell wall b2, outer flaring cavity b3, sound returning cylinder b1 is inboard to be connected with the cell wall b2 internal surface is embedded fixedly, the inside whole movable fit of cell wall b2 and outer flaring cavity b3, outer flaring cavity b3 both sides and the whole movable fit of sound returning cylinder b1, sound returning cylinder b1 is equipped with two, distributes at cell wall b2 internal surface, is connected with its internal surface is embedded fixedly, whole top and outer flaring cavity b3 are on a horizontal line, wherein sound returning cylinder b1 is favorable to leading partial sound inside sound returning cylinder b1, through the structure cooperation of inside, prolongs its warning suggestion audible alarm's effect, can also send out the sound of piercing the ear simultaneously.

Wherein, echo section of thick bamboo b1 includes echo pipe b11, sound-proof wall b12, sound inlet b13, spiral pipe b14, echo pipe b11 lower extreme and spiral pipe b14 top welded connection, spiral pipe b14 is whole to be connected with the inside block of sound-proof wall b12, sound-proof wall b12 bottom and the whole nested connection of sound inlet b13, sound inlet b13 upper end and the inside movable fit of echo pipe b11, spiral pipe b14 normally is the heliciform hollow tube, and the outer end is connected with the inboard block of sound-proof wall b12, and the top is connected with the left lower extreme welded connection of echo pipe b11, and wherein echo pipe b11 is favorable to prolonging the sound, pours the high pitch into echo pipe b11 inside, and not only early warning sound is elongated, still more has the penetrability.

Wherein, the pipe b11 of returning to the voice is including changing sound plastic piece c1, alternately leading to seat c2, leading sound chamber c3, it is connected with alternately leading to seat c2 surface built-in to change sound plastic piece c1 is terminal, alternately leading to seat c2 wholly with lead sound chamber c3 inner wall built-in connection, leading sound chamber c3 inside with change the whole clearance fit of sound plastic piece c1, change sound plastic piece c1 wholly and be the rectangular slice of arc, distribute and connect at alternately leading to seat c2 surface built-in, rather than leading the inside clearance fit of sound chamber c3, wherein change sound plastic piece c1 and be favorable to making the change to the promotion sound of alarm, can also send the effect of penetrability utensil and public address simultaneously to can promote the operating personnel of production the very first time.

The specific working principle is as follows:

the invention diffuses the early warning alarm sound sent by equipment through the sound amplifying groove 121 which is fixedly clamped by the anti-falling block 123 on the cover body 122, and the early warning alarm sound is sent out from the interior and then expands outwards in the expanded cavity b3, then a part of sound enters the interior of the echo tube b1 which is embedded on the inner surface of the groove wall b2, so that the early warning sound which enters the sound inlet b13 enters from the spiral tube b14 on the inner side of the sound insulation wall b12, the sound is generated, the sound has certain penetrability, finally the sound amplifying tube b11 which reaches the top is led out from the interior of the expanded cavity b3 on the outer end, the alarm sound which enters the sound returning tube b11 changes the sound color under the obstruction of the sound changing plastic sheet c1, so that the sound is transmitted outwards along with the diffusion on the cross through seat c2 which is embedded in the sound guide cavity c3, the operator of the production can hear the early warning alarm sound at the first time, and the early warning alarm sound which is formed by the internal equipment through the sound amplifying cover 12, make inside sound that forms partly get into echo section of thick bamboo b1 inside and form more have penetrability and muddy promotion alarm sound under the supplementary of spiral pipe b14, change the sound and mould the piece cooperation in top echo pipe b11 in addition, make the change to the promotion sound of alarm, can also send the effect of utensil penetrability and public address simultaneously, the effectual early warning suggestion alarm sound transmission range of having solved is limited, the penetrability is not strong, the problem of early warning suggestion can not be accomplished to the very first time.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein; any reference sign in a claim should not be construed as limiting the claim concerned.