CN201272486Y - Winding and packing machine - Google Patents

Abstract

The utility model relates to a winding machine which belongs to the technical field of packing machinery. The winding machine comprises a machine housing, a lifting mechanism of a lifting stand, a lifting stand, a film delivery mechanism, a base, a turnplate used for carrying packing bags and a position-limiting mechanism used for limiting the up-and-down movement position of the film delivery mechanism, wherein the machine housing is provided with a cavity, a turnplate driving mechanism is arranged on the bottom of the cavity, and the housing wall of the machine housing is longitudinally provided with a lifting stand sliding groove communicated with the cavity; the lifting mechanism of a lifting stand is fixedly arranged in the cavity; the lifting stand is provided with a sliding guiding strip and connected with the lifting mechanism of a lifting stand, and the sliding guiding strip is matched with the lifting stand sliding groove in a sliding mode; the film delivery mechanism is fixed at the lifting stand; the base is arranged on one side of the machine housing; the turnplate used for carrying packing bags is rotatably arranged on the base to be connected with the turnplate driving mechanism in a transmission mode; and the position-limiting mechanism used for limiting the up-and-down movement position of the film delivery mechanism is arranged on the machine housing and matched with the film delivery mechanism. The utility model has the advantages of rapidly winding films to deliver the films to outside the packing bag on the turnplate and guaranteeing the constant pitch of winding; reducing the labor intensity of a worker and saving labor forces.

Description

Winding and packing machine

Technical field

The utility model belongs to packing machinery technology, is specifically related to a kind of winding and packing machine.

Background technology

For some product chemical and medicine industry series products and even the intermediate of producing health products imidazolidine or the like for example particularly, except the packaging bag of self, film also need be wrapped to entire body outside packaging bag, prevent that on the one hand product from oozing out and cause damage from packaging bag, can avoid on the other hand causing pollution because of product oozes out, play on the one hand protection against the tide again, for storage and transportation provide safety control.But, in the prior art packaging bag being added the work that twines film is all taken on by manual, the imidazolidine product of being produced with the utility model applicant is an example, specifically is by 6-7 person cooperative works, and the time that is spent that is wrapped of a packing being finished film is about 6-10min.Therefore not only work efficiency is low, and the personnel that drop into are many, and labor strength is big.In addition, the effect that is wrapped also can't be protected, and can show usually or because of excessive the generation Lou of the pitch that is wrapped twines, perhaps causes the unreasonable waste of film because of the pitch that is wrapped overstocked (too small).

Summary of the invention

Task of the present utility model is to provide a kind of can the raising to be wrapped efficient and to guarantee the effect that is wrapped, and can reduce a staff and alleviate the winding and packing machine of labor strength again.

Task of the present utility model is finished like this, a kind of winding and packing machine, and it comprises the casing that constitutes a shell chamber and be provided with a rotating disk driver train in the bottom in shell chamber, vertically offers a crane sliding tray that communicates with described shell chamber on the shell wall of casing; One crane lift system is installed in the described shell chamber; One constitutes the crane of sliding guide, connect with described crane lift system, and described sliding guide and described crane sliding tray bearing fit; One film transfer device is fixed with described crane; One base is configured in a side of described casing; One is used for the rotating disk of carrier package bag, is configured in rotationally on the described base, connects with described rotating disk driver train transmission; One is used for spacing stop gear is carried out in the up-and-down movement position of described film transfer device, is located on the described casing and with the film transfer device and matches.

In a specific embodiment of the present utility model, described rotating disk driver train comprises first motor, first power wheel, first driving band, second power wheel and expansion tightening wheel, first motor is fixed on the bottom in the shell chamber of casing, first power wheel is fixed on the motor shaft of first motor, one end of first driving band is nested with on first power wheel, the other end is stretched over and is placed on second power wheel outside the shell chamber, the second power wheel hub setting connects firmly at the central part of base and with rotating disk, expansion tightening wheel is located on the base, and contacts with first driving band.

In another specific embodiment of the present utility model, described first, second power wheel is belt pulley or sprocket wheel, and described first driving band is belt or chain.

Go back in the specific embodiment of the present utility model, described first, second power wheel is a sprocket wheel, and described first driving band is a chain.

In another specific embodiment of the present utility model, described crane lift system comprises guide rail bracket, second motor, drop-gear box, a pair of the 3rd power wheel, a pair of second driving band, a pair of top shoe, a pair of sliding block and a pair of the 4th power wheel, the top in the shell chamber of the upper end of guide rail bracket and described casing is fixed, the bottom in lower end and shell chamber is fixed, second motor matches with drop-gear box and is fixed on the top of guide rail bracket, a pair of the 3rd power wheel is separately fixed at the two ends of the power take-off shaft of drop-gear box, sheathed second driving band on each the 3rd power wheel, one end of second driving band and top shoe connect, the lower end of second driving band and sliding block connect, on a pair of, the sliding block cunning fits on the guide rail bracket and with described crane and connects, a pair of the 4th power wheel is located at the bottom of guide rail bracket, and connects with described second driving band separately.

In another specific embodiment of the present utility model, each vertically is installed with a guide rail the corresponding both sides of described guide rail bracket, respectively offer one first guide groove on the described a pair of top shoe, respectively offer one second guide groove on the described a pair of sliding block, first, second guide groove and described guide rail are slippery.

More of the present utility model and in specific embodiment, described the 3rd, the 4th power wheel is belt pulley or sprocket wheel, described second driving band is a chain.

In of the present utility model and then specific embodiment, described the 3rd, the 4th power wheel is a sprocket wheel, and described second driving band is a chain.

Of the present utility model again more and in specific embodiment, described film transfer device comprises support, vertical rod, friction roller, deflector roll and tension adjusting device, the sliding guide of support and described crane is fixed, vertical rod is vertically fixed on an end of the base plate of support, the lower end hub setting of friction roller and deflector roll is at the other end of described base plate, the upper end hub setting of friction roller and deflector roll is on the top board of support, and the upper end of friction roller also is stuck in top board and described tension adjusting device connects, tension adjusting device is located on the top board, wherein: described vertical rod, friction roller and deflector roll constitute the position relation that triangle distributes each other.

In again of the present utility model and then specific embodiment, described tension adjusting device comprises the adjustment screw rod, handle, friction band pressing plate, the friction band, spring and case, adjusting screw rod is located on the screw bolt seat, screw bolt seat is fixed on the described top board, the middle part of adjusting screw rod is equipped with spring bearer plate, the lower end cunning of spring bearer plate fits on the first spring bearer plate sliding tray that is opened on the top board, and the upper end cunning of spring bearer plate fits on the second spring bearer plate sliding tray that is opened on the case, on the handle hole that handle is provided on the case to be offered, the lower end of handle is installed with a cam, this cam contacts with described friction band pressing plate, and the upper end of handle is stuck in outside the described handle hole, one end of friction band pressing plate is located in the rotating shaft rotationally, rotating shaft is fixed on the described top board, the other end of friction band pressing plate connects firmly with an end of friction band, the top ends of the friction roller that the middle part of friction band is outer with being stuck in described top board contacts, the other end and the top board of friction band are fixed, spring is nested with on described adjustment screw rod, one end of spring contacts with friction band pressing plate, the other end contacts with described spring bearer plate, and the case lid fits on the described top board.

The technical scheme that the utility model is recommended can be wrapped film apace and place outside the packaging bag on the rotating disk, and can guarantee the pitch unanimity that is wrapped; Can alleviate working strength of workers and labor savings.

Description of drawings

Fig. 1 is a specific embodiment constructional drawing of the utility model winding and packing machine.

Fig. 2 is an application examples scheme drawing of the utility model winding and packing machine.

For your inspector of the making Patent Office especially public can be expressly understood technical spirit of the present utility model and beneficial effect more, the applicant will be described in more detail the technical solution of the utility model in conjunction with the accompanying drawings below, but the applicant does not constitute restriction to technical solutions of the utility model to the description of embodiment below, any form of having done according to the utility model design but not the improvement of essence all should be considered as technical scheme scope disclosed in the utility model.

The specific embodiment

Please be referring to Fig. 1, provided just as the clothes closet shape and be the casing 1 of cuboid, this casing 1 is the fully enclosed under running condition, promptly the door 14 of casing 1 is in closed condition.On casing 1, also is furnished with electric control box 15.By shown in Figure 1, casing 1 be hollow promptly constitute shell chamber 11, for use in the crane lift system 2 that is about to mention below installing, dispose rotating disk driver train 12 in the bottom in shell chamber 11, and to offering a crane sliding tray 13, otherly be provided with a stop gear 7 in crane sliding tray 13 places in one of them lateral longitudinal of casing 1.Preferred but not stop gear 7 that be limited to comprises that the travel switch position adjusts bar 71 and first travel switch 72 and second travel switch 73, the travel switch position is adjusted bar 71 and is fixed on the casing 1 and parallel with described crane sliding tray 13 with welding or riveted joint or with other similar fixed form, first travel switch 72 is fixed on the upper end that bar 71 is adjusted in the travel switch position, second travel switch 73 is fixed on the lower end that bar 71 is adjusted in the stroke type switch position, and first, second travel switch 72,73 is electrically connected by circuit 74 and aforesaid electric control box 15.

Preferably but not the structure of the rotating disk driver train 12 that definitely is limited to is as follows: one first motor 121 is fixed on the bottom in shell chamber 11 by motor fixing seat 1211, promptly be fixed on the base plate in shell chamber 11, on the motor shaft of first motor 121, fix first power wheel 122, specifically: the motor shaft of the axle sleeve 1221 on first power wheel 122 and first motor 121 is fixed, an end of sheathed first driving band 123 on first power wheel 122, and the other end of first driving band 123 is drawn in shell chamber 11 and is nested with on second power wheel 124, second power wheel 124 by axle bed hub setting rotationally at the central part of base 5, and second power wheel 124 is also fixed by the central authorities of one group of screw and rotating disk 6, so that drive rotating disk 6 rotations by second power wheel 124.In order to make first driving band 123 maintain certain force of strain, therefore on base 5, be provided with a pair of expansion tightening wheel 125, this respectively connects with first driving band 123 mutually to expansion tightening wheel 125.In the present embodiment, select first driving band 123 to be chain, select first, second power wheel 122,124 to be sprocket wheel, yet, if first, second power wheel 122,124 is used instead belt pulley and is used first driving band 123 instead belt, should be considered as equivalence so.

Continue to see Fig. 1, integrally be arranged in the aforesaid shell chamber 11 as guide rail bracket 21 preferred but not the crane lift system 2 that is limited to, specifically be the top and the bottom of guide rail bracket 21 to be fixed with the top board and the base plate in shell chamber 11 respectively, respectively be installed with a guide rail 211 in the corresponding both sides of the short transverse of guide rail bracket 21 with one group of screw 212.Connect by technique known as second motor 22 that constitutes crane lift system 2 and drop-gear box 23, and take the top that second motor 22 is fixed on guide rail bracket 21 by drop-gear box 23.A pair of the 3rd power wheel 24 is fixed on the two ends of the power take-off shaft 231 of drop-gear box 23, be drop-gear box 23 power take-off shaft two axle heads each fix one the 3rd power wheel 24, sheathed one second driving band 25 on each the 3rd power wheel 24, one end of each second driving band 25 is fixed with an end of trimming screw 251 on, the other end of last trimming screw 251 and top shoe 26 are fixing, top shoe 26 is slided by first guide groove of being offered on it 261 and is fitted on the aforesaid guide rail 211, the other end of each second driving band 25 is fixed with an end of trimming screw 252, the other end of following trimming screw 252 and sliding block 27 are fixing, and sliding block 27 is slided by second guide groove of being offered on it 271 and fitted on the guide rail 211.A pair of the 4th power wheel 28 is located at the end, two ends of power axle 281 respectively, and the middle part hub setting of power axle 281 (being provided with rotationally) is in the bottom of guide rail bracket 21, and each the 4th power wheel 28 connects with described second driving band 25.In the present embodiment, the 3rd, the 4th power wheel 24,28 is all selected sprocket wheel, second driving band 25 is selected chain.

By shown in Figure 1, upper and lower slide block 26,27 usefulness fix screws and crane 3 are fixing, and the sliding guide 31 on the crane 3 probes in the crane sliding tray 13.When that be electrically connected with electric control box 15 and when having second motor, 22 work of rotating function, just make the 3rd power wheel 24 drive second driving band 25, and then by second driving band, 25 drives the 4th power wheel 28, make upper and lower slide block 26,27 along guide rail 211 upstream or downstream simultaneously, because upper and lower slide block the 26, the 27th, connect firmly mutually with crane 3, it is up or move down therefore to drive crane 3.Be fixed on the crane 3 owing to film transfer device 4 again, so this mechanism moves with the upper and lower of crane 3.

Still see Fig. 1, the applicant elaborates to film transfer device 4, the middle part of one support 41 with one group of screw 413 fixing corresponding to one group of screw hole 311 place on the sliding guide 31 of crane 3 and sliding guide 31, one vertical rod 42 is promptly fixed by the right-hand member of shown position state at present with a vertical topography ground and an end of the base plate 411 of support 41, be furnished with a pallet 421 in the bottom of vertical rod 42, the top of vertical rod 42 is furnished with a platen 422.The function of vertical rod 42 is to be used to place film rolling 8, and 422 pairs of film rolling 8 of platen compel to hold, and play up and down occurs to prevent film rolling 8.The other end that the lower end of friction roller 43 and deflector roll 44 is arranged on base plate 411 rotationally is the left end of shown position state, the upper end hub setting of friction roller 43 and deflector roll 44 (being provided with rotationally) is on top board 412, and the upper end of friction roller 43 also is stuck in top board 412 and matches with tension adjusting device 5, also offers one second spring bearer plate sliding tray 4121 on top board 412.By the figure finding, vertical rod 42, friction roller 43 and deflector roll 44 threes constitute leg-of-mutton position distribution relation.

Then see Fig. 1, the applicant elaborates to tension adjusting device 5, one adjustment screw rod 451 revolves and fits on the screw bolt seat 4511, screw bolt seat 4511 hangs down solid on top board 412, is furnished with a spring bearer plate 4512 at adjustment screw rod 451, each narrow contracting of the two ends of spring bearer plate 4512 constitutes a slip bead (illustrated among the figure but do not mark Reference numeral), the slip bead of lower end and the aforesaid first spring bearer plate sliding tray 4121 are slippery, and the slip bead of upper end is slippery with the second spring bearer plate sliding tray 4561 that is opened in case 456 tops.Handle 452 is inserted in the handle hole 4562 on the case 456, be fixed with a cam 4521 in the lower end of handle 452, cam 4521 contacts with the middle part of a side of friction band pressing plate 453, one end hub setting by rotating shaft 4531 (being provided with rotationally) of friction band pressing plate 453 is on top board 42, the other end is fixed with an end of 454 with friction, and friction is fixing with 454 the other end and top board 412, friction is with 454 the roller end of middle part envelope outside friction roller 43 stretches upwards top board 412, spring 455 is set in to be adjusted on the screw rod 451, one end contacts with friction band pressing plate 453, the other end contacts with spring bearer plate 4512, and case 456 lids fit on the top board 412.By manual with along or anticlockwise direction bar handle 452, can make the cam 4521 on the handle 452 promote friction band pressing plate 453 or discharge friction band pressing plate 453, when cam 4521 acted on i.e. promotion friction band pressing plate 453, friction was just unclamped with the upper end of friction roller 43 with 454, and vice versa.In addition, adjust screw rod 451 by the cw turn, can make spring bearer plate 4512, spring 455 compressions and act on spring bearer plate 4512 towards spring 455 direction displacements, the friction that connects firmly with spring bearer plate 4512 is increased with the cohesive force of friction roller 43 with 454, and vice versa.

The matching relationship of rotating disk 6 and base 5 is just as the cooperate principle of the being seen round table rotating disk of daily life with table top.Normally, under running condition, base 5 is found a place on casing 1 terrace on one side, is intervally distributed with one group of carriage 51 on base 5, hub setting (setting) support roller 511 on each carriage 51, and support roller 511 contacts with rotating disk 6.

Please consult Fig. 2 and still in conjunction with Fig. 1, the applicant narrates use of the present utility model, illustrated packaging bag 9 in Fig. 2, be pulverous chemical products in the packaging bag 9, for example by the imidazolidine product of the applicant's production.By forklift or similar facility pallet 10 being taken packaging bag 9 places on the rotating disk 6.During the film 81 of drawing on being wrapped to entire body outside will be by film rolling 8 to packaging bag 9, at first remove the platen 422 on vertical rod 42 tops, film rolling 8 is nested with in the vertical rod 42, pallet 421 holding film rolling 8 by vertical rod 42 bottoms, and platen 421 is returned vertical rod 42, seize on both sides by the arms by the top of 421 pairs of film rolling 8 of platen.Then, bar handle 452, make cam 4521 lose the thrusting action of friction being with pressing plate 453, friction loses obvolvent with the upper end of 454 pairs of friction rollers 43, at this moment, draw film 81 from film rolling 8, specifically: make film 81 process on friction roller 43 and the deflector roll 44, whole film 81 draws behind friction roller 43 and deflector roll 44 with S shape form ground and to packaging bag 9.By the personnel's of working online bar handle 452 once more, make cam 452 be returned to and in friction band pressing plate 453, friction is with the upper end of 454 obvolvents in friction roller 43.And then, press button on the electric control box 15 by the personnel of working online, make first, second motor 121,22 enter work simultaneously, drive first power wheel 122 by the work of first motor 121, drive second power wheel 124 through first driving band 123, because second power wheel 124 connects firmly with rotating disk 6, therefore drive rotating disk 6 rotations by second power wheel 124, make the packaging bag 9 that places on the rotating disk 6 be in slew mode, under the slew mode of packaging bag 9, make film 81 be wrapped in (Fig. 2 signal) outside the packaging bag 9.Meanwhile, under the work of second motor 22, make 24 motions of the 3rd power wheel, because being covers, second driving band 25 is associated in the 3rd, the 4th power wheel 24, on 28, and second driving band 25 is also with last, sliding block 26,27 connect firmly, therefore on, sliding block 26,27 move up along the guide rail on the guide rail bracket 21 211, again because last, sliding block 26, the 27th, with crane 3 fixed connections, therefore last, sliding block 26,27 to drive crane 3 up the time up, also owing to whole film transfer device 4 fixes with crane 3 by its support 41, therefore it is up to drive film transfer device 4 by crane 3, film 81 is upwards twined one by one from the bottom of packaging bag 9, ram 414 when touching the haptic element of first travel switch 72 when set on the support 41 of film transfer device 4, give electric control box 15 by circuit 74 with signal feedback, make second motor 22 do contrarotation, by aforesaid same principle, on, sliding block 26,27 move down, crane 3 and whole film transfer device 4 be operation downwards also, film 81 from top to down are wrapped in the packaging bag 9, and the packaging bag 9 outer bilayers that form are wrapped.When raming 414 when touching the haptic element of second travel switch 73 on the support 41, then signal is fed back to electric control box 15 once again by circuit 74, first, second motor 121,22 is quit work simultaneously.Film 81 is blocked with instrument by the staff, the packaging bag 9 of the film 81 that will be wrapped then removes from rotating disk 6.In the course of the work, also can obtain suitable tension force by the adjustment screw rod 451 of manual adjustment tension adjusting device 45.

Packaging bag 9 with equal volume is an example, adopt the utility model device to improve and be wrapped efficient more than 6 times, and the number of the work of participation can be reduced to 2 people by 6-7 people in the prior art.Also owing to be to be wrapped automatically, so the pitch of film 81 in packaging bag 9 reaches unanimity.When the height of packaging bag 9 changes, can correspondingly adjust the position of first travel switch 72 so.

Claims (10)

1, a kind of winding and packing machine, it is characterized in that it comprises the casing (1) that constitutes a shell chamber (11) and be provided with a rotating disk driver train (12) in the bottom of shell chamber (11), vertically offers a crane sliding tray (13) that communicates with described shell chamber (11) on the shell wall of casing (1); One crane lift system (2) is installed in the described shell chamber (11); One constitutes the crane (3) of sliding guide (31), connect with described crane lift system (2), and described sliding guide (31) and described crane sliding tray (13) bearing fit; One film transfer device (4), fixing with described crane (3); One base (5) is configured in a side of described casing (1); One is used for the rotating disk (6) of carrier package bag, is configured in rotationally on the described base (5), connects with described rotating disk driver train (12) transmission; One is used for spacing stop gear (7) is carried out in the up-and-down movement position of described film transfer device (4), is located at described casing (1) and upward and with film transfer device (4) matches.

2, winding and packing machine according to claim 1, it is characterized in that described rotating disk driver train (12) comprises first motor (121), first power wheel (122), first driving band (123), second power wheel (124) and expansion tightening wheel (125), first motor (121) is fixed on the bottom in the shell chamber (11) of casing (1), first power wheel (122) is fixed on the motor shaft of first motor (121), one end of first driving band (123) is nested with on first power wheel (122), the other end is stretched over outside the shell chamber (11) and is placed on second power wheel (124), second power wheel (124) hub setting connects firmly at the central part of base (5) and with rotating disk (6), expansion tightening wheel (125) is located on the base (5), and contacts with first driving band (123).

3, winding and packing machine according to claim 2 is characterized in that described first, second power wheel (122,124) is belt pulley or sprocket wheel, and described first driving band (123) is belt or chain.

4, winding and packing machine according to claim 3 is characterized in that described first, second power wheel (122,124) is a sprocket wheel, and described first driving band (123) is a chain.

5, winding and packing machine according to claim 1, it is characterized in that described crane lift system (2) comprises guide rail bracket (21), second motor (22), drop-gear box (23), a pair of the 3rd power wheel (24), a pair of second driving band (25), a pair of top shoe (26), a pair of sliding block (27) and a pair of the 4th power wheel (28), the top in the shell chamber (11) of the upper end of guide rail bracket (21) and described casing (1) is fixed, the bottom of lower end and shell chamber (11) is fixed, second motor (22) matches with drop-gear box (23) and is fixed on the top of guide rail bracket (21), a pair of the 3rd power wheel (24) is separately fixed at the two ends of the power take-off shaft of drop-gear box (23), each the 3rd power wheel (24) is gone up sheathed second driving band (25), one end of second driving band (25) and top shoe (26) connect, the lower end of second driving band (25) and sliding block (27) connect, on a pair of, sliding block (26,27) the sliding guide rail bracket (21) that fits over upward and with described crane (3) connects, a pair of the 4th power wheel (28) is located at the bottom of guide rail bracket (21), and connects with described second driving band (25) separately.

6, winding and packing machine according to claim 5, it is characterized in that described guide rail bracket (21) corresponding both sides each vertically be installed with a guide rail (211), respectively offer one first guide groove (261) on the described a pair of top shoe (26), respectively offer one second guide groove (271) on the described a pair of sliding block (27), first, second guide groove (261,271) is slippery with described guide rail (211).

7, winding and packing machine according to claim 1 is characterized in that described the 3rd, the 4th power wheel (24,28) is belt pulley or sprocket wheel, and described second driving band (25) is a chain.

8, winding and packing machine according to claim 7 is characterized in that described the 3rd, the 4th power wheel (24,28) is a sprocket wheel, and described second driving band (25) is a chain.

9, winding and packing machine according to claim 1, it is characterized in that described film transfer device (4) comprises support (41), vertical rod (42), friction roller (43), deflector roll (44) and tension adjusting device (45), support (41) is fixing with the sliding guide (31) of described crane (3), vertical rod (42) is vertically fixed on an end of the base plate (411) of support (41), the lower end hub setting of friction roller (43) and deflector roll (44) is at the other end of described base plate (411), the upper end hub setting of friction roller (43) and deflector roll (44) is on the top board (412) of support (41), and the upper end of friction roller (43) also is stuck in top board (412) and connects with described tension adjusting device (45), tension adjusting device (45) is located on the top board (412), wherein: described vertical rod (42), friction roller (43) and deflector roll (44) constitute the position relation that triangle distributes each other.

10, winding and packing machine according to claim 9, it is characterized in that described tension adjusting device (45) comprises adjustment screw rod (451), handle (452), friction band pressing plate (453), friction band (454), spring (455) and case (456), adjusting screw rod (451) is located on the screw bolt seat (4511), screw bolt seat (4511) is fixed on the described top board (412), the middle part of adjusting screw rod (451) is equipped with spring bearer plate (4512), the lower end cunning of spring bearer plate (4512) fits on the first spring bearer plate sliding tray (4121) that is opened on the top board (412), and the upper end cunning of spring bearer plate (4512) fits on the second spring bearer plate sliding tray (4561) that is opened on the case (456), handle (452) is provided on the handle hole of being offered on the case (456) (4562), the lower end of handle (452) is installed with a cam (4521), this cam (4521) contacts with described friction band pressing plate (453), and the upper end of handle (452) is stuck in outside the described handle hole (4562), one end of friction band pressing plate (453) is located in the rotating shaft (4531) rotationally, rotating shaft (4531) is fixed on the described top board (412), the other end of friction band pressing plate (453) connects firmly with an end of friction band (454), the top ends of the friction roller (43) that the middle part of friction band (454) is outer with being stuck in described top board (412) contacts, the other end of friction band (454) and top board (412) are fixing, spring (455) is nested with on described adjustment screw rod (451), one end of spring (45) contacts with friction band pressing plate (453), the other end contacts with described spring bearer plate (4512), and case (456) lid fits on the described top board (412).

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