Tandem continuous ball mill
Technical field
Tandem continuous ball mill, belongs to the ceramic product plant-scale equipment and ball-milling technology technical field.Also can be used for the ball milling that other needs the clay series products of ball milling.
Background technology
What continuous ball mill used in the market be generally monomer grinds and multi-section serial formula continuous ball mill continuously; the object of continuous ball mill is to improve output; continuous ball milling output is improved under same ore removal granularity requirements; the way generally adopted lengthens to strengthen ball grinder; because material is tending towards the reason of level and flow direction of material; there will be mill ball medium few problem more than when ball grinder is long, also there will be the problem that material size particles mixes simultaneously.In addition, the discharge method of existing continuous ball mill mostly adopts overflow manner discharging, and overflow discharging must make liquid level in tank body higher than discharging opening, due to the impact of slip buoyancy, liquid level in tank body is higher, the grinding effect of mill ball medium is lower, because charging aperture and discharge outlet are on same axis, if when tank body is level, while slip overflows to discharging opening, also can overflow at charging aperture, resistance will be caused like this to charging, also the mixed effect of charging and mill ball medium can be affected, so there is a lot of continuous ball mill to adopt the mounting means of high in and low out, namely charging aperture is higher than discharging opening, this mode also there will be mill ball medium few situation more than in tank body, grinding effect can be made to have a greatly reduced quality.Multi-section serial formula continuous ball mill due to series connection tank body size length consistent, its length is all between 5-8 rice, when the bulk materials grinding to clay class, have that first segment ball milling yields poorly, the problem of not discharging, the way of current employing carries out continuous ball milling again block material was worn into slurry with intermittent ball mill before continuous ball milling after, and what do not have real meaning like this realizes continuous ball milling.
Chinese utility model patent ZL200920064172.X discloses a kind of sectional type wet process continuous ball mill used for ceramics, it is incorporated into one by being connected in series with working chamber by array drive unit, each working chamber is fixed on respective drive unit through bearing block, the input of working chamber establishes material input control device, establish mill ball medium and wear-resistant liner in its chamber, the output of working chamber sets out materials device.It is huge, complicated that this utility model overcomes existing ceramic ball milling device structure, and production efficiency is low, unstable product quality, the defect of controllability difference.This utility model Problems existing has: adopt overflow manner discharging, and slip also can overflow from feed end while discharge end overflows; First order ball milling yields poorly, and cannot meet the output of ball grinder below; Cannot realize under non-stop-machine prerequisite the adding materials and mill ball medium at regular time and quantity of working chamber below.
Utility model content
Problem to be solved in the utility model is: overcome the deficiencies in the prior art, provides a kind of and can adapt to the material of different size, output that the slurry-outlet quantity of first order ball grinder can meet ball grinder below, can realize not shutting down the tandem continuous ball mill adding material and mill ball medium.
The utility model solves the technical scheme that its technical problem adopts: this tandem continuous ball mill, it is characterized in that: comprise charging gear, one-level ball grinder, secondary ball grinder and drawing mechanism, charging gear is connected with one-level ball grinder feed end, secondary ball grinder has the multiple of series connection, one-level ball grinder is connected by jockey with adjacent secondary ball grinder, be connected by jockey between adjacent secondary ball grinder, one-level ball grinder and the equal separate transmission of each secondary ball grinder, the discharge end of the secondary ball grinder of end is connected with drawing mechanism, the length of one-level ball grinder is 1.5 ~ 3 times of a secondary ball grinder length, the inner chamber of one-level ball grinder has the tapering reduced gradually to discharge end diameter from feed end.The length of one-level ball grinder is generally 12m, and the length of secondary ball grinder is generally 6m; Tandem continuous ball mill can determine the progression of secondary ball grinder according to the difference of grinding material, the link of interval ball milling must be carried out before decreasing the continuous ball milling of current domestic employing, ensure that the slurry-outlet quantity of first order ball grinder meets the output of ball grinder below; The tapering of the inner chamber of one-level ball grinder can prevent large mill ball medium from moving with flow direction of material the problem that the material size particles that causes mixes.
Preferably, described one-level ball grinder comprises one-level tank body, charging end cap and crusher discharge end cover, and charging end cap is fixed on one-level tank body front end, and crusher discharge end cover is fixed on one-level tank body rear end, one-level tank body terminus inner arranges and carries stream filter, one-level inner tank wall is inlayed one-level ceramic lining plate.
Preferably, described one-level ceramic lining plate inwall is provided with helical raised, and the rotation direction of helical raised is contrary with turning to of one-level tank body.Helical raised to affect by charging to while discharge end movement at mill ball medium, constantly mill ball medium is sent to feed end is counter.
Preferably, described stream filter of carrying comprises and carries flow table and rubber sieve plate, put forward the funnel-form that flow table profile is traverse, inside division becomes multiple compartment, the osculum carrying flow table is discharging opening, large mouth is charging aperture, rubber sieve plate is fixed on the charging aperture place carrying flow table, and the sieve aperture of slip on rubber sieve plate enters the charging aperture carrying flow table.Carry stream filter the discharge method of ball grinder to be changed into by traditional overflow carry stream, the liquid level in ball grinder can control in required position.
Preferably, the length of described one-level ball grinder is 12 ~ 15m, and the length of secondary ball grinder is 5 ~ 8m.
Preferably, described charging gear comprises feed hopper, U-shaped bucket and reductor, feed hopper is fixed on the upside opening part of U-shaped bucket, feed hopper is connected with U-shaped bucket, the side of U-shaped bucket is communicated with the feed end of one-level ball grinder by charging gear feeding tube, be provided with helical axis in U-shaped bucket and charging gear feeding tube, helical axis is provided with helical blade, and reductor is connected with helical axis by power transmission shaft.Charging gear in the course of the work endlessly for tandem continuous ball mill provides material, and can supplement mill ball medium for one-level ball grinder.
Preferably, outside described charging gear feeding tube, cover has one to water drum, charging gear feeding tube and giving to be formed between water drum one annular to aquaporin, feedwater passage end is closed, the other end is connected with the feed end of one-level ball grinder, to water drum offers with the channel connection that feeds water give water hole.
Preferably, described jockey comprises jockey feeding tube and rear-fed mouth, jockey feeding tube front end is fixed on the discharge end of one-level ball grinder or secondary ball grinder, rear-fed mouth fixes the feed end being communicated with adjacent secondary ball grinder, and jockey feeding tube posterior rotation stretches in rear-fed mouth; Jockey feeding tube rear outside is provided with helical blade, and at helical blade arranged outside outer cover, outer cover is fixedly connected with rear-fed mouth, and outer cover is provided with charge pipe.Jockey for secondary ball grinder supplements the slip of mill ball medium and composite grain requirement in non-stop-machine situation, can ensure that the continuity of tandem continuous ball mill work.
Preferably, described drawing mechanism comprises drawing mechanism feeding tube and U-shaped hopper, drawing mechanism feeding tube is fixed on the discharge end of end secondary ball grinder, drawing mechanism feeding tube rotates and stretches in U-shaped hopper, U-shaped hopper is fixed on the discharge end of end secondary ball grinder by a pipe, arranges discharge nozzle bottom U-shaped hopper end.
Compared with prior art, the beneficial effect that tandem continuous ball mill of the present utility model and ball grinding method have is:
1, the utility model can determine ball grinder progression according to the difference of grinding material, the first order ball grinder lengthened can extend the milling time of material in tank body and process, the link of interval ball milling must be carried out before decreasing the continuous ball milling of current domestic employing, achieve continuous ball milling truly, and ensure that the slurry-outlet quantity of first order ball grinder meets the output of ball grinder below; The tapering of the inner chamber of one-level ball grinder can prevent large mill ball medium from moving with flow direction of material the problem that the material size particles that causes mixes.
Ceramic embedded liner plate in the tank body of 2, ball grinder, compared to rubber lining, the grinding effect of ceramic lining plate better, more wear-resisting, grinding efficiency is higher, longer service life; The helical raised that inwall is arranged to affect by charging to while discharge end movement at mill ball medium, constantly mill ball medium is sent to feed end is counter, the mill ball medium of feed end is constantly compensated.
3, the discharge end of every grade of ball grinder carries flow table and rubber sieve plate, by the Liquid level in ball grinder at ideal position, can reduce slip to the buoyancy of mill ball medium, thus improve the integral pressure of mill ball medium in ball grinder tank body, improve grinding efficiency; The use of rubber sieve plate, can make every grade of ball grinder can both obtain the slip of desired particle size.
4, jockey can realize not shutting down and add mill ball medium at regular time and quantity, thus its operating efficiency and grinding effect are significantly improved.
5, the ball milling unit of many group separate transmission is in series by jockey, and eliminate charging and discharging time completely, compact overall structure, floor space is little, and staffing is few, and automaticity is high, long service life, and product ultimate cost obviously reduces.
6, each ball grinder only needs a power small electric machine and does not need to start simultaneously, therefore greatly reduces the capacity of electrical network and the impact to electrical network, and equipment investment kind reduces.Solve traditional pottery continuous type ball mill must adopt two powerful mair motor and must start simultaneously, king-sized problem is impacted to electrical network.
7, materials different for granule size is joined in corresponding ball grinder, avoid the situation that the little material of granularity particle in the ball grinder that mill ball medium is larger does not obtain grinding refinement substantially, substantially increase operating efficiency.
Accompanying drawing explanation
Fig. 1 is the front view of tandem continuous ball mill.
Fig. 2 is the top view of tandem continuous ball mill.
Fig. 3 is ball grinder structural representation.
Fig. 4 is the structural representation of charging gear.
Fig. 5 is the front view of transmission device.
Fig. 6 is the top view of transmission device.
Fig. 7 is the structural representation of jockey.
Fig. 8 is the structural representation of drawing mechanism.
Wherein: 1, charging gear 101, roller shaft 102, support 103, cycloidal planetary gear speed reducer 104, power transmission shaft 105, U-shaped bucket 106, feed hopper 107, charging gear feeding tube 108, graphite packing 109, helical axis 110, to water drum 2, transmission device 201, pinion 202, reductor 203, motor 3, jockey 301, jockey feeding tube 302, upper outer cover 303, charge pipe 304, lower outer cover 305, rear-fed mouth 306, helical blade 4, one-level ball grinder 401, carry flow table 402, manhole 403, manhole cover 404, one-level tank body 405, one-level ceramic lining plate 5, installation foundation 6, drawing mechanism 601, drawing mechanism feeding tube 602, U-shaped hopper 7, secondary ball grinder.
Detailed description of the invention
Fig. 1 ~ 8 are embodiments of the present utility model, are described further tandem continuous ball mill of the present utility model and ball grinding method below in conjunction with accompanying drawing 1 ~ 8.
Tandem continuous ball mill comprises charging gear 1, one-level ball grinder 4, jockey 3, secondary ball grinder 7, transmission device 2 and drawing mechanism 6, every grade of one-level ball grinder 4 and every grade of secondary ball grinder 7 arrange independently transmission device 2 respectively, charging gear 1 is connected with the feed end of one-level ball grinder 4, be connected by jockey 3 between one-level ball grinder 4 and adjacent secondary ball grinder 7, secondary ball grinder 7 has the multiple of series connection, be connected by jockey 3 between adjacent secondary ball grinder 7, the discharge end of the secondary ball grinder 7 of end is connected with drawing mechanism 6; The length of one-level ball grinder 4 is 1.5 ~ 3 times of secondary ball grinder 7 length, and the inner chamber of one-level ball grinder 4 has the tapering reduced gradually to discharge end diameter from feed end.Charging gear 1, one-level ball grinder 4, jockey 3, secondary ball grinder 7, transmission device 2 and drawing mechanism 6 according to the rules position are fixed on the installation foundation 5 of armored concrete.
Embodiment 1
As Fig. 1, shown in 2: charging gear 1 is a separate transmission unit, be in whole tandem continuous ball mill foremost, one-level ball grinder 4 and independent gear 2 form the ball milling unit of one-level band separate transmission, secondary ball grinder 7 and independent gear 2 form the ball milling unit of secondary band separate transmission, charging gear feeding tube 107 is inserted in the charging end cap of the one-level ball grinder 4 of ball mill, be connected by jockey 3 between one-level ball grinder 4 and adjacent secondary ball grinder 7, secondary ball grinder has three grades, be connected by jockey 3 between adjacent secondary ball grinder 7, jockey 3 is responsible for adding mill ball medium and slip to secondary ball grinder 7 in non-stop-machine situation, drawing mechanism 6 is positioned at the discharge end of the secondary ball grinder 7 of end, be responsible for the position discharge of slip to regulation.Charging gear 1, one-level ball grinder 4, jockey 3, secondary ball grinder 7, transmission device 2 and drawing mechanism 6 all according to the rules position relationship are arranged on the installation foundation 5 of armored concrete.
As shown in Figure 3: the length of one-level ball grinder 4 is 12m, one-level tank body 404 two ends of one-level ball grinder 4 arrange tank flange respectively, one-level tank body 404 has a manhole 402, the Main Function of manhole 402 is convenient to safeguard and clear up one-level tank body 404 in time, and the manhole cover 403 that manhole 402 is bolted on one-level tank body 404 outer wall seals.One-level tank body 403 feed end is the charging end cap be bolted on tank flange, and discharge end is the crusher discharge end cover be bolted on tank flange; One-level tank body 404 feed end has the canine tooth wheel disc be bolted on feed end tank flange, and canine tooth wheel disc and one-level tank body 404 are arranged on the same axis, in case one-level tank body 404 produces comparatively big bang during work.One-level tank body 404 inwall inlays one-level ceramic lining plate 405, one-level ceramic lining plate 405 is arranged the helical raised around inwall, and the rotation direction of helical raised is contrary with turning to of one-level ball grinder 4; The inner chamber of one-level ball grinder 4 has the tapering reduced gradually to discharge end diameter from feed end.Charging end cap and crusher discharge end cover inwall inlay rubber lining respectively, crusher discharge end cover inwall is bolted and carries flow table 401, putting forward flow table 401 profile is the funnel-form of traverse, inside division becomes multiple fan-shaped compartment, carrying flow table 401 osculum is discharging opening, large mouth is charging aperture, rubber sieve plate be bolted on carry flow table 401 charging aperture on, the sieve aperture of slip on rubber sieve plate enters the charging aperture carrying flow table 401, rubber sieve plate can carry out filtering screening to slip, makes every grade of ball grinder can both obtain the slip of desired particle size.Charging end cap and crusher discharge end cover install base bearing respectively, and base bearing is arranged in main bearing seat, and one-level ball grinder 4 installs location mainly through base bearing and main bearing seat.
The length of secondary ball grinder 7 is 6m, and the inwall of secondary ball grinder 7 inlays common circular secondary liner plate, and the inner chamber of secondary ball grinder 7 is cylindric, and remaining shape, structure and assembling mode are as one-level ball grinder.
Carrying stream filter can also be that waterwheel pattern carries flow table, carries flow table and fixes rubber sieve plate away from the side of crusher discharge end cover.
As shown in Figure 5,6: motor cavity is in the low order end of whole transmission device 2, it is the motor 203 be bolted above motor cabinet, the output shaft of motor 203 is connected with reductor 202 power shaft by little pin coupler, reductor 202 is bolted on reducer pedestal, reducer pedestal is bolted on the installation foundation 5 of armored concrete, and the output shaft of reductor 202 is connected with one end of pinion shaft by large pin coupler.Pinion shaft two ends have two pinion shaft bearings respectively, and pinion shaft bearing is arranged in pinion shaft bearing block, and pinion shaft bearing block is bolted on installation foundation 5.Pinion 201 is arranged between the middle part of pinion shaft, two pinion shaft bearings.
As Fig. 1,2,3, shown in 5 and 6: ball grinder and corresponding transmission device 2 form one-level independence ball milling unit, the canine tooth wheel disc of ball grinder is wanted to engage with the pinion 201 of transmission device 2, canine tooth wheel disc is driven to rotate by pinion 201 during work, gear wheel dribbling is moved ball grinder and is rotated, and the length of one-level ball grinder 4 is 1.5 ~ 3 times that secondary ball milling hangs length.
As shown in Figure 4: the feeder frame of charging gear 1 is fixed on the installation foundation 5 of armored concrete position according to the rules by bolt.Feeder frame top is provided with two triangle tracks separated by a distance, track is can along the support 102 of rail moving, and two roller shafts 101 are installed, roller shaft 101 and triangle track at right angle setting in the position that keeps to the side, support 102 two ends.Roller shaft 101 two ends are V grooved roller, and roller shaft 101 is bolted bottom support 102 by roller shaft bearing and roller shaft bearing block, and the triangle track in V grooved roller and feeder frame agrees with and can roll along triangle track.Cycloidal planetary gear speed reducer 103 is bolted on the left end of support 102, the output shaft of cycloidal planetary gear speed reducer 103 is connected by sliding block type coupler one end with power transmission shaft 104, power transmission shaft 104 two ends arrange two transmission shaft bearings respectively, and transmission shaft bearing is arranged in the transmission shafts bearing that is bolted on support 102.Power transmission shaft 104 other end is connected by spindle nose bolt with helical axis 109, helical axis 109 is welded with pressure feeding spiral blade.Pressure feeding spiral blade-section is in U-shaped bucket 105 and charging gear feeding tube 107 is inner, U-shaped bucket 105 has a helical axis axis hole near the side of power transmission shaft 104, one end of helical axis 109 is stretched out and is connected with power transmission shaft 104 from axis hole, axis hole place is sealed by the sealing plate be fixed on by bolt and sealing clamp on U-shaped bucket 105, the top of U-shaped bucket 105 is the feed hoppers 106 be bolted, U-shaped bucket 105 is connected with feed hopper 106, U-shaped bucket 105 other end is connected with charging gear feeding tube 107 by bolt, and junction is sealed by caulking gum.Be helical axis 109 in charging gear feeding tube 107, outside cover has one to water drum 110, charging gear feeding tube 107 and giving to be formed between water drum 110 one annular to aquaporin, feedwater passage end is closed, the other end is connected with the feed end of one-level ball grinder 4, to water drum offers be connected with to aquaporin give water hole, water and alkalinity additive can be added.One end of charging gear feeding tube 107 is inserted on feed opening flange, sealed by graphite packing 108, graphite packing 108 is fixed on feed opening flange by bolt and packing pressing plate, and feed opening flange has the feed inlet end being bolted to one-level ball grinder 4 to cover.
As shown in Figure 7: the support of jockey 3 is bolted between two ball grinders adjacent on the installation foundation 5 of armored concrete, support is put and is bolted lower outer cover 304, lower outer cover 304 is connected and fixed by bolt the outer cover that forms a whole with upper outer cover 302 above.On upper outer cover 302, centre position has a square orifice, is the charge pipe 303 be bolted on outer cover 302 above square orifice.The flange of overall outer cover one end installs the caulking gum pressing plate and caulking gum that are bolted, and caulking gum and jockey feeding tube 301 outer wall seal; The end of the jockey feeding tube 301 that the other end Flange joint of overall outer cover is bolted.The inside of overall outer cover is jockey feeding tube 301.A mounting flange is installed in jockey feeding tube 301 front end, jockey feeding tube 301 is bolted the discharge end at one-level ball grinder 4 and secondary ball grinder 7 by mounting flange, jockey feeding tube 301 rear portion outer wall is provided with helical blade 306, and helical blade 306 can by the mill ball medium that added by charge pipe 303 or supplementary slip advancing ball grinding jar; The front port of jockey feeding tube 301 is connected with the discharging opening carrying flow table 401 of ball grinder, and rear end thereof puts in the secondary tank body of adjacent secondary ball grinder 7.It is peripheral that rear-fed mouth 305 is in jockey feeding tube 301 deutomerite, and the flange of rear-fed mouth 305 one end is sealed by caulking gum and jockey feeding tube 301, and caulking gum has caulking gum pressing plate and is bolted on rear-fed mouth 305.Rear-fed mouth 305 other end flange is bolted on feed opening flange, and feed opening flange has the feed end being bolted to next stage ball grinder to cover.
As shown in Figure 8: drawing mechanism 6 is positioned at the least significant end of whole tandem continuous ball mill, the support of drawing mechanism 6 is bolted on the installation foundation 5 of armored concrete, the top of support is the U-shaped hopper 602 of the back-end closure be bolted, have a circular port bottom U-shaped hopper 602 rear end, circular port is connected with the discharge nozzle of vertical direction.U-shaped hopper 602 front end has a circular port, and is connected with a pipe, and the pipe other end arranges adpting flange, and outside is the caulking gum and caulking gum buckle that are bolted, and sealing bound feet and drawing mechanism feeding tube 601 outer wall seal.Drawing mechanism feeding tube 601 is bolted on discharging opening flange, the front port of drawing mechanism feeding tube 601 is connected with flow table 401 discharging opening of carrying of end secondary ball grinder 7, rear port inserts in U-shaped hopper 602, and discharging opening flange is bolted on the crusher discharge end cover of end secondary ball grinder 7.
For the ball milling unit of level Four separate transmission, a tandem continuous ball mill is assembled according to Fig. 1 and Fig. 2, wherein: the length of one-level ball grinder 4 is 12m, one-level ball grinder 4 feed end is connected with charging gear 1, the discharge end of one-level ball grinder 4 is connected with jockey 3, the discharge end of jockey 3 is connected with the feed end of first order secondary ball grinder 7, once analogize, the discharge end of third level secondary ball grinder 7 is connected with the feed end of drawing mechanism 6, and the transmission device 2 of the ball milling unit of every one-level separate transmission is positioned at the same side of corresponding ball grinder.Charging gear 1, one-level ball grinder 4, jockey 3, secondary ball grinder 7, transmission device 2 and drawing mechanism 6 are fixed on the installation foundation 5 of armored concrete.
The ball grinding method of this tandem continuous ball mill is as follows:
First pass through to add a certain amount of mill ball medium in all ball grinders of manhole 402, the mill ball medium granularity of adding in one-level ball grinder 4 is 50-110mm, the mill ball medium granularity of first secondary ball grinder 7 is 40-90mm, the mill ball medium granularity of second secondary ball grinder 7 is 30-70mm, and the mill ball medium granularity of the 3rd secondary ball grinder 7 is 20-50mm; In one-level ball grinder 4, the material of granularity at 20-25mm is added by the manhole 402 of one-level ball grinder 4;
Start the cycloidal planetary gear speed reducer of charging gear 1, cycloidal planetary gear speed reducer drives helical axis 109 to rotate by power transmission shaft 104; Start the motor 203 of all transmission devices 2 successively, motor 203 rotates by driving the pinion 201 on pinion shaft after reductor 202 speed change, and pinion 201 drives canine tooth wheel disc to rotate, and gear wheel dribbling is moved ball grinder and rotated; The rotating speed of ball grinder is regulated by the reductor 202 of transmission device 2, and the rotating speed of one-level ball grinder 4 is the fastest, and reduces successively, and the rotating speed of last secondary ball grinder 7 is the slowest;
Feed hopper 106 to charging gear 1 adds the material that granularity is 20-25mm, according to the attrition degree of mill ball medium, in feed hopper 106, supplement the mill ball medium that granularity is 50-110mm, add water and alkalinity additive by the water drum 110 of giving on charging gear feeding tube 107;
In the course of work, after the size sieving and grading of raw meal particle size, the material of different size is joined in this ball grinder from the charge pipe 303 of the jockey 3 of this grade of ball grinder front end; The raw meal particle size of one-level ball grinder 4 requires as 20-25mm, first secondary ball grinder 7 is 12-14mm, and second secondary ball grinder 7 is 5-7mm, and the 3rd secondary ball grinder 7 is 0.1-0.5mm, scope belonging to raw meal particle size, directly joins in corresponding ball grinder;
For clay class or granularity at the material of 15-48um, directly join in last secondary ball grinder 7 with pump by the charge pipe 303 of afterbody jockey 3 after pulp;
Through ground raw meal particle size substantially all between 15-48um, enter U-shaped hopper 602 by drawing mechanism feeding tube 601, then discharged by the discharge nozzle of U-shaped hopper 602 rear end.
Embodiment 2
When lower to the granularity requirements of material, can select to connect two secondary ball grinders 7 below at one-level ball grinder 4, the length of one-level ball grinder 4 is 15m, and the length of secondary ball grinder 7 is 5m, all the other shape and structures are constant, and assembling mode, ball grinding method are as embodiment 1.
Embodiment 3
If material requirement is higher, can select to connect multiple secondary ball grinder 7 below at one-level ball grinder 4, concrete number is selected according to actual needs, the length of one-level ball grinder 4 is 15m, the length of secondary ball grinder 7 is 8m, all the other planforms are constant, and assembling mode, ball grinding method are as embodiment 1.
The above, it is only preferred embodiment of the present utility model, be not restriction the utility model being made to other form, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the Equivalent embodiments of equivalent variations.But everyly do not depart from technical solutions of the utility model content, any simple modification, equivalent variations and the remodeling done above embodiment according to technical spirit of the present utility model, still belong to the protection domain of technical solutions of the utility model.