CN209160677U

CN209160677U - One kind being applied to chaindriven chain falling prevention mechanism

Info

Publication number: CN209160677U
Application number: CN201821791685.6U
Authority: CN
Inventors: 周兆弟
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-11-01
Filing date: 2018-11-01
Publication date: 2019-07-26
Anticipated expiration: 2028-11-01

Abstract

The utility model discloses one kind to be applied to chaindriven chain falling prevention mechanism, including a guide way, and guide way has the lateral guiding groove successively advanced for chain link on the upside of sprocket wheel, and the notch of lateral guiding groove is identical as the direction of travel of chain link on the upside of sprocket wheel to slot bottom direction；The length L1 of lateral guiding groove is greater than or equal to the maximum radius R1 of the sprocket wheel；The groove width of lateral guiding groove is W, and the maximum width of chain link is W1, and the tooth tip width of sprocket wheel is W2, has W1 < W < W1+W2.The guide way for being applied to chaindriven chain falling prevention mechanism and there is lateral guiding groove by setting of the utility model, and control the installation site and width of lateral guiding groove, reach guidance and adjust the direction of travel of chain link to guarantee the reliable transmission connection of chain and sprocket wheel, prevents chain from occurring jumping tooth or de- tooth phenomenon because deviateing sprocket wheel.

Description

One kind being applied to chaindriven chain falling prevention mechanism

Technical field

The utility model relates to building fields, and in particular to one kind is applied to chaindriven chain falling prevention mechanism.

Background technique

When existing production revolving body building materials such as steel reinforcement cage, the steel reinforcement cage that completion is woven on steel reinforcement cage production line is needed by turning Next operating area is moved to, needs a kind of transmission equipment for steel reinforcement cage transfer in this way.Existing drive apparatus generallys use chain The transmission transfer that chain transminssion mechanism completes steel reinforcement cage is taken turns, which is made of winding chain on sprocket wheel.By It is equipped with spiral bar in steel reinforcement cage outer surface, when steel reinforcement cage transmits on the chain of transmission mechanism, is easy to pull chain because of spiral bar Item and drive chain to deviate former transmitting path, so that chain is easy to happen de- chain in transmission, influence the normal operation of production line, sternly It also will cause accident when weight.It is therefore desirable to prevent chain from de- chain occurs.

Utility model content

In order to solve the above technical problems, the utility model, which provides one kind, is applied to chaindriven chain falling prevention mechanism, installation To prevent chain and sprocket wheel to be separated on sprocket wheel chain transmission mechanism.

One kind provided by the utility model is applied to chaindriven chain falling prevention mechanism, including a guide way, guide way have For the lateral guiding groove that chain link on the upside of sprocket wheel is successively advanced, and chain link on the upside of the notch to slot bottom direction and sprocket wheel of lateral guiding groove Direction of travel it is identical；

The length L1 of lateral guiding groove is greater than or equal to the maximum radius R1 of the sprocket wheel；

The groove width of lateral guiding groove is W, and the maximum width of chain is W1, and the tooth tip width of sprocket wheel is W2, has W1 < W < W1+W2。

Further, the length L1 of the lateral guiding groove is greater than or equal to the root diameter D of sprocket wheel.

Further, the linear distance L2 of the sprocket wheel centre of gyration to lateral guiding groove notch is greater than or equal to chain circulation Turn the linear distance L3 at center to lateral guiding groove slot bottom.

Further, the guide way also has the guide groove advanced to lateral guiding groove guidance chain, is transversely leading On positive slot slot bottom to the direction of notch, the groove width of guide groove is gradually increased.

Further, the guide way includes vertical pole and two cross bars disposed in parallel；

The lateral guiding groove and guide groove are formed between two cross bars, and two cross bars are in close to lateral guiding groove notch One end bottom connect with the vertical pole.

It further, further include the baffle for being located at guide way tail portion, baffle has the block face of the bending towards sprocket wheel direction；

Minimum spacing between block face and chain link is L4, and L4 is less than the radius R2 of roller in chain.

Further, the block face is arcwall face, and the central angle of arcwall face is a, has 1 ° of 180 ° of < a <.

Further, overhead height of the overhead height of the guide way lower than chain link on the upside of sprocket wheel.

Further, further include auxiliary guide way, be set to below guide way, have parallel with the lateral guiding groove and tie The lateral guiding groove of the consistent auxiliary of structure, the lateral guiding groove of the auxiliary are successively advanced for chain link on the downside of sprocket wheel.

It further, further include axially external set on the sprocket wheel and the side seal board of the connection guide way.

The guiding applied to chaindriven chain falling prevention mechanism by setting with lateral guiding groove provided by the utility model Body, and control the installation site and width of lateral guiding groove, reach guidance and adjust the direction of travel of chain link with guarantee chain and The reliable transmission connection of sprocket wheel prevents chain from occurring jumping tooth or de- tooth phenomenon because deviateing sprocket wheel.

In addition, the utility model passes through setting baffle, and by the gap of control baffle and chain link, it can be to avoid because of chain Tooth is jumped caused by relaxation, guarantees chaindriven normal operation；In addition, by setting side seal board, prevent sprocket wheel it is axially external have it is different Object enters sprocket wheel, also worker's finger can be prevented to be strayed into safety problem caused by sprocket wheel etc..

Detailed description of the invention

Fig. 1 is the schematic view of the mounting position that chain falling prevention mechanism is installed on driving wheel in embodiment 1；

Fig. 2 is the enlarged structure schematic diagram of letter A in Fig. 1；

Fig. 3 is the stereoscopic schematic diagram of chain falling prevention mechanism in embodiment 1；

Fig. 4 is the integrated structure schematic diagram of chain falling prevention mechanism and chain-drive mechanism in embodiment 1；

Fig. 5 is the integrated structure top view of chain falling prevention mechanism and chain-drive mechanism in embodiment 1；

Fig. 6 is use state diagram of the chain falling prevention mechanism in two transmission mechanism assemblings in embodiment 1；

Fig. 7 is the structural schematic diagram that chain falling prevention mechanism installs side seal board in embodiment 1；

Fig. 8 is the use state diagram that chain falling prevention mechanism is installed on driving wheel and driven wheel in embodiment 1；

Fig. 9 is the use state diagram that chain falling prevention mechanism is installed on the rack in embodiment 2；

Figure 10 is the partial structural diagram that chain falling prevention mechanism is installed in conjunction with transmission mechanism in embodiment 2；

Figure 11 is another structural schematic diagram of chain falling prevention mechanism in embodiment 2.

Detailed description of the invention: 1- rack, 11- platform, 21- driving wheel, 22- driven wheel, 3- chain, 31- chain link, 311- chain link, 312- chain link, 313- chain link, 314- chain link, 32- roller, 4- revolving body building materials, 5- baffle, 6- guide way, 61- cross bar, 62- are vertical Bar, 63- transverse direction guiding groove, 64- guide groove, 7- installation part, 8- side seal board, 9- assist guide way, 91- lower pallet, and 10- is fixed Part.

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work Every other embodiment obtained, fall within the protection scope of the utility model.

Embodiment 1

As shown in Figure 1, the present embodiment provides one kind to be applied to chaindriven chain falling prevention mechanism, can be used in sprocket wheel chain and be driven In mechanism.Wherein, sprocket wheel chain transmission mechanism includes driving wheel 21 and driven wheel 22, is installed around between driving wheel 21 and driven wheel 22 There is the chain 3 of annular, the transmission direction and transmission speed of chain 3 are controlled by driving wheel 21.22 water of driving wheel 21 and driven wheel Flat to be arranged and be installed in rack 1, chain 3 is around on driving wheel 21 and driven wheel 22, and chain 3 is by multiple 31 (packets of chain link Include but be not limited to chain link 311, chain link 312, chain link 313, chain link 314) successively pin joint be connected to form ring, the chain 3 positioned at upside Upper surface forms for support and is driven the loading end of revolving body building materials 4 (such as steel reinforcement cage).For the ease of the revolution on loading end 4 stable transmission of body building materials, rack 1 are equipped with platform 11, and the chain 3 of upside, which is approached or fitted on platform 11, to be driven, and make The loading end that chain 3 provides is smooth and improves bearing capacity, convenient for the transmission of revolving body building materials 4.

In order to guarantee the bearing capacity and driving force of sprocket wheel chain transmission mechanism, 3 side of traveling of upside chain of corresponding loading end It with the direction is forward direction in the present embodiment to for from driven wheel 22 to the direction of driving wheel 21, i.e. the drive direction of driving wheel 21.

As shown in Fig. 1 to Fig. 5, chain falling prevention mechanism provided in this embodiment includes a guide way 6, and guide way 6 is close to actively The setting of 21 tops is taken turns, guide way 6 has the lateral guiding groove 63 that the chain link 31 for 21 upside of driving wheel is successively advanced, lateral correcting The notch of slot 63 is identical as 31 direction of travel of chain link of upside to slot bottom direction.For the effective correcting of chain 3 to deviation, laterally The notch of guiding groove 63 will at least accommodate first chain link 311 that will be engaged with driving wheel 21, the slot bottom of lateral guiding groove 63 Guarantee chain 3 in the normal rotation of driving wheel 21, it would be desirable to be able to first chain link 312 turned with driving wheel 21 is accommodated, therefore, The length L1 of lateral guiding groove 63 needs the maximum radius R1 more than or equal to driving wheel 21.Specifically, lateral guiding groove 63 Groove width is W, and the maximum width of chain link 3 is W1, and the tooth tip width of driving wheel 21 is W2, and the groove width of lateral guiding groove 63 has W1 < W < W1+W2, the groove width of lateral guiding groove 63 should guarantee normal row of the chain link 31 with driving wheel 21 in lateral guiding groove 63 Into the groove width of that is, lateral guiding groove 63 is greater than the maximum width of chain link 31；It can make the chain for deviating from 21 tooth position of driving wheel again Section 31 can timely correcting, i.e., maximum width of the groove width less than chain link 31 of lateral guiding groove 63 and master when entering lateral guiding groove 63 The sum of tooth tip width of driving wheel 21, in 63 width of transverse direction guiding groove, chain link 31 deviates 21 longitudinal center line of driving wheel and pastes Close lateral 63 inner wall of guiding groove, but between the pin in chain link 31 between two neighboring pin hole without departing from driving wheel 21 tooth tip, at this time The chain link 31 of deviation can be effectively aligned and with the tooth engagement of driving wheel 21 without de- chain occurs, and not influence the normal row of chain 3 Into.The center line of lateral guiding groove 63 is overlapped with the longitudinal center line of driving wheel 21, prevents chain 3 de- with most effective setting Chain.

As shown in Figures 2 to 5, in order to which the anti-fall off chain for making lateral guiding groove 63 acts on more effective safe, lateral guiding groove 63 Notch to 22 direction of driven wheel extend to lateral guiding groove 63 length L1 be greater than or equal to driving wheel 21 root diameter D, and the linear distance L2 for meeting 21 centre of gyration of driving wheel to lateral 63 notch of guiding groove is turned round more than or equal to driving wheel 21 The straight degree of chain 3 is aligned in advance, that is, moves closer to driving wheel 21 and i.e. to the linear distance L3 of lateral 63 slot bottom of guiding groove in center By second chain link 313 engaged with driving wheel 21 even third chain link 314 also in lateral guiding groove 63.

As shown in Figure 3 and Figure 4, be successively connected in series from beginning to end due to chain 3 by adjacent chain link 31, chain 3 it is inclined Be from trend formed by multiple adjacent links 31, therefore adjust chain 3 directly spend when need it is incremental.To realize the purpose, The guide groove 64 that the present embodiment on guide way 6 also there is lateral guiding groove 63 chain to be guided to advance, guide groove 61 are set to laterally The notch position of guiding groove 63, on transversely direction of 63 slot bottom of guiding groove to notch, the groove width of guide groove 64 is gradually increased, The minimum slot width of guide groove 64 is equal to the groove width of lateral guiding groove 63, has no the chain link 31 deviateed to the levelling of lateral guiding groove 63 Deviation enters lateral guiding groove 63, and the maximum groove width of guide groove 64 is less than the maximum width of guide way, protrudes guide groove 64 not In guide way, beauty simple for structure.

As shown in figure 3, chain falling prevention mechanism provided in this embodiment, guide way 6 includes two cross bars 61 disposed in parallel, Two cross bars 61 are set to the axial sides of tooth on driving wheel 21, and equal with the chain of upside 3, are formed between two cross bars 61 horizontal To guiding groove 63, guide groove 64 is formed between the front of two cross bars 61, the rear portion of two cross bars 61 forms lateral guiding groove 63 Slot bottom.Since cross bar 61 is parallel interval setting, and there is certain length, slot bottom provides sizing for the rear portion of cross bar 61 Support, and the front of cross bar 61 is notch, lacks sizing support, therefore in cross bar 61 in close to the one of 63 notch of lateral guiding groove Bottom is held to be equipped with the vertical pole 62 vertical with cross bar 61, vertical pole 62 connects with two cross bars 61, and the setting of vertical pole 62 is to support cross The shape of 61 front of bar guarantees that the lateral guiding groove 63 of the formation of cross bar 61 and guide groove 64 have stable groove body shape, is not easy Deform and influence chain 3 and driving wheel 21 engage and normal operation.

As depicted in figs. 1 and 2, the overhead height of chain falling prevention mechanism provided in this embodiment, guide way 6 is lower than driving wheel The overhead height of 21 upside chain links 31, i.e. chain link 31 are engaged with driving wheel 21 by guide way 6 and are turned up to driving wheel 21, chain The top of section 31 is higher than the top of guide way 6, makes the revolving body building materials 4 being carried on chain 3 will not be due to touching guide way 6 It is obstructed or is limited, hamper the normal transmission of revolving body building materials 4.If the length of sprocket wheel chain transmission mechanism falls short of, two biographies Motivation structure connect extension transmission apart from when, the overhead height of guide way 6 is lower than the overhead height of 3 last time of chain chain link 31, makes back Swivel building materials 4 by be transferred on the chain 3 of previous transmission mechanism on the chain 3 of the latter transmission mechanism be not blocked or by Limit, makes smoothly to transmit, as shown in Figure 6.

As shown in Figures 1 to 4, the operation with revolving body building materials 4 on chain 3, revolving body building materials 4 can have chain 3 The effect of pullling, makes chain 3 with the extension of time and increasingly pine, this problem usually carries out tensioning processing by strainer, But it is usually artificial tensioning, it is high using the few and use cost of automatic tensioning mechanism.The present embodiment is in order to manually be tensioned Guarantee to prevent it from jumping chain after chain 3 loosens in gap, in 6 tail portion of guide way, (the slot bottom corresponding direction of i.e. lateral guiding groove 63) is set It is equipped with the baffle 5 bent towards 21 direction of driving wheel, the setting of baffle 5 is for preventing jump chain of the chain 3 on driving wheel 21.

Baffle 5 towards the direction of driving wheel 21 has arc block face or close to the continuous bending block face of arc, preferably arc Block face because arc block face relative to continuous bending block face have be simple to manufacture, effect corresponding with the radially outer edge of driving wheel 21 More preferably, and arc block face is the arc for waiting radiuses, keeps the spacing of each tooth of driving wheel 21 and block face consistent, baffle 5 is set to master On the outside of the radial edges of driving wheel 21, the minimum spacing between the block face and chain link 31 of baffle 5 is L4, and L4 is less than roller in chain 3 32 radius R2 will not stop normal operation of the chain 3 on driving wheel 21, also make the tooth of the driving wheel 21 to be detached from of chain link 31 When, the outside of chain link 31 touches the block face of baffle 5, by the blocking of 5 block face of baffle, rotates chain link 31 with driving wheel 21 again When return on the tooth of driving wheel 21.The setting of baffle 5 can prevent all jump chains substantially, send out jump chain phenomenon will not substantially It is raw.

As shown in Fig. 2, the central angle of 5 arc of baffle with arc block face is a, there is 1 ° of 180 ° of < a <.Chain 3 exists Jump tooth on driving wheel 21 usually occurs on first chain link 312 that the chain 3 moved towards in parallel is turned with driving wheel 21, as long as The chain link 312 is limited on 21 tooth of driving wheel, the jump chain of chain 3 can be prevented, therefore the arc block face of baffle 5 is preferably at least First chain link 312 turned with driving wheel 21 can be blocked.The cambered surface of baffle 5 is no more than 180 °, all standing chain 3 and active The part of 21 engagement of wheel, but do not stop the chain 3 for removing driving wheel 21, it can also prevent clamp hand.

Baffle 5 with continuous bending block face is approximate with the baffle 5 of arc block face, it is also desirable to can at least block with actively First chain link 312 of 21 turning of wheel, and the incenter angle of continuous bending side is no more than 180 ° and stops 5 lower section of baffle not Remove the chain 3 of driving wheel 21.

Baffle 5 and guide way 6 can be weldingly connected；Alternatively, baffle 5 and guide way 6 can also for the ease of storing or installing It is formed with integral production.

In the present embodiment, sprocket wheel chain transmission mechanism is installed in rack 1, and baffle 5 is set to the rear portion of guide way 6, vertical pole 62 are connected in rack 1 close to one end of rack 1, and guide way 6 is removably mounted in rack 1 by vertical pole 62, and baffle 5 is separate The bottom of guide way 6 is equipped with installation part 7, and baffle 5 is removably mounted in rack by installation part 7.Guide way 6 and baffle 5 divide It is not mounted in rack 1 by mounting structure, makes the chain falling prevention mechanism of the present embodiment that there is high robust stability.

As shown in fig. 7, in order to further ensure the normal operation of sprocket wheel chain transmission mechanism, it is outside in the axis of driving wheel 21 Side is additionally provided with side seal board 8, and side seal board 8 is mounted on the axially external of the driving wheel 21 by 1 outside of rack as needed, in order to use Convenient, side seal board 8 is all connected with baffle 5, guide way 6, is not limited to welding or integral production forms or other modes connection.Side seal Plate 8 is mounted on the axially external of driving wheel 21, can prevent the axially external foreign matter for entering driving wheel 21 of driving wheel 21 from causing The failure of driving wheel 21 can also prevent worker's finger to be strayed into the equal caused safety problem of driving wheel 21.

As shown in figure 8, in order to be applicable in the sprocket wheel chain transmission mechanism that can be rotated forward and invert, it can also be in pair of driven wheel 22 Answer position that chain falling prevention mechanism is installed, chain falling prevention mechanism at driven wheel 22 is for upside chain 3 from driving wheel 21 to driven When 22 operating of wheel, prevent chain 3 from taking off chain from driven wheel 22.

Embodiment 2

In contrast to embodiment 1, it is applied to chaindriven chain falling prevention mechanism the present embodiment provides a kind of optimization.

With the consistent structure of embodiment 1 in the present embodiment, identical appended drawing reference is given, and omits identical text and says It is bright.

As shown in Figure 9 and Figure 10, provided in this embodiment to be applied to chaindriven chain falling prevention mechanism, it further include auxiliary guiding Body 9, is set to the lower section of guide way 6, auxiliary guide way 9 have with the consistent auxiliary transverse direction guiding groove of lateral 63 structure of guiding groove, it is auxiliary Lateral guiding groove is helped successively to advance for 21 downside chain link 31 of driving wheel.Auxiliary guide way 9, which preferably is arranged in parallel to tilt, to be set It sets.

The guidance of auxiliary guide way 9 has certain straight degree by the chain 3 that driving wheel 21 produces, in addition, auxiliary guide way 9 is also used It is adjusted when that is, upside chain 3 is run from driving wheel 21 to 22 direction of driven wheel by under driving wheel 21 in 21 antiport of driving wheel The chain 3 that side enters driving wheel 21 is directly spent, and chain 3 is enable to normally enter driving wheel 21, is guaranteeing sprocket wheel chain transmission mechanism just Often operating.

Assist being equipped with fixing piece 10 between guide way 9 and guide way 6, the front of the connection auxiliary guide way 9 of fixing piece 10 and The front of guide way 6, fixing piece 10 are used to consolidate the structure of anti-shedding mechanism.

Also there is with guide groove 64 the consistent auxiliary guide groove of corresponding and structure on the auxiliary guide way 9 of the present embodiment.

As shown in figure 11, it assists the bottom of guide way 9 that can also set supporting plate 91,21 lower section of driving wheel is set to, to hold Hold in the palm the chain loosened.When chain 3, which loosens, to be also tensioned not in time, with the part chain of the rotation of driving wheel 21 to 21 bottom of driving wheel 3 because gravity hangs down, and disengagement is engaged with driving wheel 21, will affect chain conveyer when serious, causes failure and influence to use.Lower pallet 91 be set to the lower section of driving wheel 21, and support reduces the site of engagement of chain 3 and driving wheel 21 because heavy because loosening the chain 3 to hang down Lower part chain 3 caused by power hangs down takes off tooth to entire chaindriven influence, guarantees chaindriven normal operation.

For the structural stability for further increasing anti-shedding mechanism, assists guide way 9 to be connected with the bottom of baffle 5, make to lead An entirety is formed to body 6, baffle 5, auxiliary guide way 9 and fixing piece 10.Guide way 6, baffle 5 assist guide way 9 and fix Part 10 can be weldingly connected；Alternatively, for the ease of storing or installing, guide way 6, baffle 5, auxiliary guide way 9 and fixing piece 10 It can also be formed with integral production.

In the present embodiment, sprocket wheel chain transmission mechanism is installed in rack 1, and guide way 6, baffle 5 and auxiliary guide way 9 divide It is not fixed in rack 1 by mounting structure, or is mounted in rack 1 after forming an entirety by mounting structure, make this The chain falling prevention mechanism of embodiment has high stability.

In order to further ensure the normal operation of sprocket wheel chain transmission mechanism, axially external in driving wheel 21 is additionally provided with side Sealing plate 8, side seal board 8 are mounted on the axially external of the driving wheel 21 by 1 outside of rack, for ease of use, side seal as needed Plate 8 is all connected with baffle 5, guide way 6, auxiliary guide way 9, is not limited to welding or integral production forms or other modes connection. Side seal board 8 is mounted on the axially external of driving wheel 21, can prevent the axially external foreign matter for entering driving wheel 21 of driving wheel 21 Cause the failure of driving wheel 21, worker's finger can also be prevented to be strayed into the equal caused safety problem of driving wheel 21.

In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped Containing an independent technical solution, this description of the specification is merely for the sake of clarity, is not playing creative work Under the premise of, the portion of techniques scheme or overall technical architecture in each embodiment are through the portion in appropriate intercombination, each embodiment Point technical solution or overall technical architecture and existing conventional techniques means may also be suitably combined to form those skilled in the art The other embodiments being understood that.

Claims

1. one kind is applied to chaindriven chain falling prevention mechanism, it is characterised in that: including a guide way, guide way has on sprocket wheel The lateral guiding groove that side chain section is successively advanced, and on the upside of the notch of lateral guiding groove to slot bottom direction and sprocket wheel chain link traveling side To identical；

The groove width of lateral guiding groove is W, and the maximum width of chain link is W1, and the tooth tip width of sprocket wheel is W2, has W1 < W < W1+ W2。

2. according to claim 1 be applied to chaindriven chain falling prevention mechanism, it is characterised in that: the transverse direction guiding groove Length L1 is greater than or equal to the root diameter D of sprocket wheel.

3. according to claim 1 be applied to chaindriven chain falling prevention mechanism, it is characterised in that: the sprocket wheel centre of gyration It is greater than or equal to the linear distance of the sprocket wheel centre of gyration to lateral guiding groove slot bottom to the linear distance L2 of lateral guiding groove notch L3。

4. according to claim 1 be applied to chaindriven chain falling prevention mechanism, it is characterised in that: the guide way also has The guide groove advanced to lateral guiding groove guidance chain, on transversely direction of the guiding groove slot bottom to notch, the slot of guide groove Width is gradually increased.

5. according to claim 4 be applied to chaindriven chain falling prevention mechanism, it is characterised in that: the guide way includes vertical Bar and two cross bars disposed in parallel；

The lateral guiding groove and guide groove are formed between two cross bars, and two cross bars are in close to the one of lateral guiding groove notch End bottom is connect with the vertical pole.

6. according to claim 1 be applied to chaindriven chain falling prevention mechanism, it is characterised in that: further include being located at guide way The baffle of tail portion, baffle have the block face of the bending towards sprocket wheel direction；

7. according to claim 6 be applied to chaindriven chain falling prevention mechanism, it is characterised in that: the block face is arc Face, the central angle of arcwall face are a, have 1 ° of 180 ° of < a <.

8. according to claim 1 be applied to chaindriven chain falling prevention mechanism, it is characterised in that: the top of the guide way Overhead height of the height lower than chain link on the upside of sprocket wheel.

9. according to claim 1 be applied to chaindriven chain falling prevention mechanism, it is characterised in that: further include auxiliary guiding Body is set to below guide way, is had and is laterally led with the lateral lateral guiding groove of the consistent auxiliary of correcting slot structure, the auxiliary Positive slot is successively advanced for chain link on the downside of sprocket wheel.

10. according to claim 1 be applied to chaindriven chain falling prevention mechanism, it is characterised in that: further include set on described Sprocket wheel is axially external and connects the side seal board of the guide way.