CN1197761C - Method and device for guiding chain in region of chain-wheels of continuous transport unit - Google Patents
Method and device for guiding chain in region of chain-wheels of continuous transport unit Download PDFInfo
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- CN1197761C CN1197761C CN 99815369 CN99815369A CN1197761C CN 1197761 C CN1197761 C CN 1197761C CN 99815369 CN99815369 CN 99815369 CN 99815369 A CN99815369 A CN 99815369A CN 1197761 C CN1197761 C CN 1197761C
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- China
- Prior art keywords
- chain
- sprocket
- wheel
- guide
- wheels
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- Expired - Fee Related
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B23/00—Component parts of escalators or moving walkways
- B66B23/02—Driving gear
- B66B23/022—Driving gear with polygon effect reduction means
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- Escalators And Moving Walkways (AREA)
Abstract
The invention relates to a method and device for guiding a chain in the region of chain-wheels of a continuous transport unit, especially a passenger transport equipment such as an escalator or a moving pavement. According to the invention, said chain is routed in a linear way to the respective chain-wheel. After a first element of a first link pertaining to the chain strand is engaged with the chain-wheel, the active chain radius is continuously adapted, whereby the speed of the chain strand is adjusted in a continuous manner.
Description
Technical Field
The invention relates to a method and a device for guiding a chain in the chain wheel region of a continuous conveyor, in particular of a people conveyor, such as an escalator or moving walkway.
Background
European patent EP 0711725 discloses a device for guiding a continuous conveyor belt for escalators or moving walkways, in which the chain rollers are guided by means of a support rail with a raceway and a compensating rail with a raceway. At the entry end of a chain wheel which deflects the continuous conveyor belt, the chain rollers enter the curved track of the compensating rail from a straight track of the support rail and engage the chain wheel at a tangent point there. The chain rollers move forward in a direction perpendicular to the direction of movement at a distance from the chain wheels before going from the raceways of the support rails to the tangent point, which is advantageous for quiet running of the continuous conveyor belt.
By specially designing the curved shape of the connecting member, it is said that the polygon effect (polygon effect) can be reduced.
When the chain of a continuous conveyor, for example a moving staircase or a moving walkway, is diverted by a sprocket, a multilateral effect and a swivel effect (umlauffekte) occur, which can have a negative effect in particular on the quiet running of the moving staircase or moving walkway. This problem also occurs in other continuous conveyors having chains as the drive members.
The polygon effect is caused by the fact that the chain is supported polygonally on the sprocket. As the angle of rotation increases, the effective radius acting on the sprocket changes. The chain speed is thereby oscillated between a maximum and a minimum. When the sprocket is engaged, the chain rollers and the teeth on the sprocket have different velocities, thereby imparting impact. The gyroscopic effect is caused by the angular momentum transferred from the sprocket to the chain ring and hence to the stairs or treads. After the chain passes over the sprocket, the angular momentum initially remains unchanged, which, based on the inertia of the system, causes the chain to roll up (Einrollen). The angular momentum is reduced by friction in the chain or by the impact between the chain and the guide element when a chain guide element is provided.
In a conventional arrangement, i.e. when the chain is deflected while driving the sprocket, the chain is directed tangentially to the sprocket. The sprocket and chain thus have different speeds when the sprocket engages. This can lead to impacts between the chain and the sprocket in the direction of the strand, which in practice can result in acceleration of the individual conveying elements, such as escalators or moving walkways. In addition to imparting noise, such periodic impacts also place high loads on the chain, sprockets and drive mechanism.
From DE-B1009777 an escalator is known, the steps of which are interconnected on both sides by toothed track chains circulating around drive wheels and guide sprockets provided at both ends of the escalator and equipped with step support wheels and additional chain support wheels. These chain support wheels have the same dimensions as the step support wheels, and are arranged between the latter, seen in the longitudinal direction of the chain, and move along with the support rails fixedly arranged thereon. In order to reduce the running noise, instead of the additional support wheel, a rail-like guide is provided in the gap between the support rail and the drive wheel or guide sprocket wheel, on which guide rail the chain rollers run in the region between the support rail and the vertical diametric plane of the connected sprocket wheel. The chain is fed linearly to a sprocket or drive wheel and first an element of the first chain ring meshes with the sprocket or drive wheel. The chain is fed tangentially approximately at the level of the pitch circle of the sprocket, and the chain is deflected only after the first chain link has engaged into the sprocket or the drive wheel, on the basis of the geometry of the rail-like guide, in particular its length to the point of engagement of the chain with the sprocket or the drive wheel. Even though the operating noise may be attenuated, this technical solution is not practical.
In U.S. Pat. No. US-a 2,128,310, an escalator is described, which, like german patent DE-B1009777, also has a rail-like guide for the chain rollers, which guide opens into the region of the chain wheels or drive wheels. The guide rail is of a curved configuration so that the chain rollers can be moved on the rail from top to bottom into the sprocket or drive wheel and then deflected. Due to the large spacing between the chain rollers to be deflected, it is not possible to reduce the operating noise when the chain is deflected (even if the chain rollers are guided into the region of the sprocket or drive wheel).
Disclosure of Invention
The object of the invention is to provide a method and a device by means of which the polygon effect and the swivel effect can be avoided, so that the quiet running of a continuous conveyor, in particular of a corresponding people conveyor, such as a moving staircase or a moving walkway, can be significantly improved. The resulting structural investment can be kept within reasonable limits without negatively affecting its competitiveness. In addition, the effective chain radius can be continuously adjusted to provide a constant speed for the strands.
The object of the invention is achieved in that the method is used for guiding a chain in the region of a chain wheel of a continuous conveyor, in particular a people conveyor, such as a escalator or a travelator, wherein the chain is conveyed linearly to the respective chain wheel or drive wheel) and first a first element on a first link of a chain strand engages on the chain wheel or drive wheel, and according to the invention the first link is deflected by the chain wheel only after a second element on the first link has been fixed by engagement with the chain wheel, and the other links on the chain strand engage with the chain wheel and are deflected in the same way.
In an advantageous further development, the line of action of the chain which is fed linearly into the sprocket or drive wheel cuts the pitch circle of the sprocket or drive wheel like a chord line.
In a further advantageous embodiment, roller-type guide elements are provided in the chain region, which guide elements are guided over the sprocket by means of a rail-like guide profile.
The output of the links of the chain from the sprocket or the drive wheel) is advantageously designed to be the same as the input of the links of the chain. A device operating according to the method of the invention is characterized in that it comprises a plurality of chain wheels for turning a chain connected to a conveying means, in particular a staircase or a tread, comprising a plurality of connecting plates and pins connecting them, as well as roller-type guide elements for driving connection to the conveying means, wherein the chain wheels are designed to be narrower, in particular in the region of their outer diameter for supporting the chain track pins or guide elements, in which region at least one, in particular rail-like, guide profile (Fuehrungspirafil) is provided on the side of the face next to the chain wheel, which profile extends substantially over the effective rolling length (Abrollagen) of the pins or guide elements.
The chain is fed to the sprocket linearly below the tangent. Wherein, viewed in the conveying direction of the chain, in front of the sprocket wheel a guide surface is provided which supports the guide element and which extends beside the sprocket wheel.
Advantageously, the guide surface turns into the guide profile essentially without transition marks, which guide surface extends linearly until two pins or two guide elements on each chain link of the chain strand engage with the sprocket wheel.
According to an advantageous embodiment of the invention, the chain guide means is arranged on a line of pitch circles as a chordal cutting sprocket, which has a length as a chordal line at least equal to the chain pitch.
The sprocket is advantageously equipped with involute teeth.
After the chain engages the sprocket, the effective chain radius is first continuously adjusted to establish a constant speed within the strand. Adjustment of the effective sprocket radius is accomplished by guiding the chain rollers (which may be simply track pins, step rollers, guard rollers, or other similar rollers). The chain link is deflected by the sprocket only after the second roller (possibly a second pin) of the chain link is fixed together by engagement with the sprocket. Thereby avoiding that the chain link is subsequently supported polygonally on the sprocket wheel, which affects the speed conditions in the strand.
When the sprocket outputs the chain, the guidance of the chain is similar to when the chain inputs the sprocket. This also reliably prevents the chain from being wound up (slewing effect). The first roller (possibly the first pin) of the chain link is released only after the chain link has rotated through 180 c as the sprocket outputs the chain.
At a constant angular velocity ω of the sprocket, a force is formed between two meshes of the sprocket
(α≤φ(t)≤α+δ)
δ here denotes the pitch angle.
At a distance r between the chain roller and the sprocket shaft, the speed of the strand is
vT＝ω×r×cos[φ(t)-α] (1)
Where phi (t) is the rotational angle of the sprocket.
α is a phase shift determined by the manner in which the chain enters the sprocket.
If one requires vTAt a constant value, then the spacing between the sprocket and the chain rollers and the sprocket rotational angle φ (t) must be matched according to the following equation:
r＝p/cos[φ(t)-α] (2)
p as a proportionality coefficient
p＝(R/r)×cos(α) (3)
Wherein R represents the pitch circle radius of the sprocket.
Equation (2) represents a trajectory curve of the chain roll in the polar diagram, which in the present case is a straight line. When the chain rollers are guided straight in the chain wheel (which is determined by the straight conveyor chain), a constant speed is established in the chain strand.
This chain guide is automatically formed in the drive sprocket as the chain is driven by the straightaway section of the strand. This is the case when the cylindrical pinwheel is driven linearly.
The linear movement of the chain in the sprocket is of course only limited when the chain is deflected by the sprocket or when the chain is driven in the region of the sprocket which is simultaneously used for deflecting the chain. The movement of the last chain roller which engages the sprocket is decisive for the speed of the strand or, in the case of a pure deflection of the chain, the last chain roller located in the sprocket is decisive for the speed of the strand. Thus, the chain ring is driven by the sprocket to rotate only initially when the second chain roller of the chain ring is held together by engagement with the sprocket. In the case of a pure deflection of the sprocket, the rotation of the chain link must be carried out at the latest when the speed of the first chain roller relative to the chain strand is critical.
The conditions set for achieving a constant strand speed are technically simple to satisfy when the chain is fed along a chord line (the length of which is at least equal to the chain pitch) which is the pitch circle of the cutting sprocket. The chain rollers can in this case pass over the chain wheels, for example, by means of a simple guide rail.
According to another concept of the invention, the sprocket is equipped with involute teeth, as in a straight-ahead cylindrical pin wheel drive. The chain rollers can be designed separately if desired, so that the parts located on the guide rail can be rolled and the parts located in the chain wheel can be fixed.
The invention makes it possible to reliably avoid impacts and the problems of the prior art, so that the quiet running of a continuous conveyor, in particular of a people conveyor, such as an escalator or an escalator, can be significantly improved. The impact has hitherto caused damage to the chain element, the sprocket wheel and the drive means, which is precluded by the proposal according to the invention.
Drawings
The invention is explained in detail below with the aid of exemplary embodiments shown in the drawings, in which:
fig. 1, 1a, 1b show an endless strand of a continuous conveyor with diverting sprockets between which drive means are arranged;
FIGS. 2 and 3 are different views or partial cross-sectional views, respectively, of a chain guide input portion of a walk-in stair for a mall;
FIGS. 4 and 5 are various views or partial cross-sectional views, respectively, of a chain guide input section of a heavy load automatic travel path;
fig. 6 shows a graph of the trajectory of a chain roll similar to that shown in fig. 2 and 3.
Detailed Description
Fig. 1, 1a and 1b show an endless strand 1 of a continuous conveyor, not shown in any further detail, which is formed, for example, by a plate-shaped conveyor belt. In addition to the chain 1, two deflecting chain wheels 2 and a drive 24, which is only schematically illustrated and is arranged between the two chain wheels 2, can be seen in the figures. As can be seen from the enlarged view of the detail "X" in fig. 1, the chain 1 is fed linearly to the drive wheels 25, 25'. Wherein, in partial view "Xa", the chain 1 is tangent to the driving wheel 25'; in the partial view "Xb", the chain 1 runs along a chord line under the tangent and engages the drive wheel 25.
Fig. 2 and 3 show a chain 1 guided around a sprocket wheel 2, which sprocket wheel 2 is provided with involute teeth 4 in the region of its outer diameter 3. The chain 1 is designed as a so-called flat link chain comprising a number of chain link plates 5, track pins 6 and chain rollers 7, 8 which are operatively connected to the steps of a escalator, not shown in the figures. The chain rollers 7 engage with a guide surface 9 which extends into the region of the chain wheel 2, which guide surface 9 is arranged on the side of a sprocket outer region 10 having a narrow structure. A guide means 11 in the form of an initially straight, then curved guide rail is connected to the guide surface 9 substantially without transition. The chain rollers 7 roll on the guide rail 11 around the chain wheel 2 in the curved course of the chain 1. Each chain link can only be deflected when the two chain rollers 8 mesh with the involute teeth 4 of the corresponding configuration of the sprocket 2 and can thus rotate at the same speed. This measure of the invention avoids the polygon effect that may occur. In the curved section 12 of the guide rail 11, the chain rollers 8 do not rest at the bottom of the tooth gaps 13. In this embodiment, the chain rollers 7, 8 are divided to design the configuration such that the part 7 located in the guide rail 11 can roll, while the part 8 located in the chain wheel 2 is fixed. Reference numeral 14 denotes the pitch circle diameter of the sprocket 2 and 15 the minimum effective action circle of the sprocket 2. The outer region 10 of the chain wheel 2 is designed as shown to be narrower than the chain 1, so that the guide rail 11 can be arranged next to the chain wheel 2. The guide rail 11 here has the task of adjusting the sprocket radii acting on the chain rollers 7, 8.
Fig. 4 and 5 show a similar embodiment, but this embodiment is only suitable for a heavy-load travelator, which is not shown in more detail.
The following components can be seen in fig. 4 and 5: sprocket 16, a chain 17 designed as a flat link chain, which chain 17 comprises a chain connecting plate 18 and a track pin 19 as well as a protective roller 20. In addition, further chain rollers 21 are provided, which are operatively connected to the tread plates of the automatic travel path, not shown in detail. The chain rollers 21 are operatively connected to the guide surface 22 similarly to what is shown in fig. 1 and 2. The guide surface 22 is arranged on one side of the chain wheel 16 and opens substantially without transition into a guide 23, which is likewise of rail-like construction. Similarly to fig. 2 and 3, the chain 17 is also fed to the sprocket 16 in a straight line below the tangent. After engagement with the sprocket 16, the effective chain radius is first continuously adjusted to establish a constant velocity in the strands. The adjustment of the effective chain radius is performed here by guiding the protective roller 20. The chain link is deflected by the sprocket 16 only after the second protective roller 20 of the chain link is fixed by engagement with the sprocket 16. Thereby avoiding that the chain link is subsequently supported polygonally on the sprocket wheel, which affects the speed conditions in the strand.
The chain guidance at the chain output region (not shown) of the sprocket 16 is similar to that at the chain input to the sprocket 16, whereby a rolling-up of the chain 17 (turning effect) can likewise be reliably avoided. The chain 17 input sprocket 16 runs on a chord line whose length is preferably exactly equal to the chain pitch.
Fig. 6 shows a schematic path profile of the chain roller 8 shown in fig. 2 and 3 with respect to the pitch circle diameter 14 of the sprocket 2. Here, the chord length I is exactly equal to the chain pitch δ. The minimum and maximum radii (r) are shownminAnd rmax). The chain pitch is denoted here by I and the pitch angle δ.
The above-mentioned conditions set for achieving a constant strand speed are technically simple to satisfy when the chain is fed along a chord line (the length of which is at least equal to the chain pitch I) which is the pitch circle of the cutting sprocket 2. The chain rollers 8 can in this case pass over the chain wheel 2, for example, by means of a simple guide rail. In the situation shown in fig. 6, the length of the string is exactly equal to the chain pitch. The trajectory of the chain rollers 8 is shown relative to the sprocket pitch circle 14. The phase shift α is in this case exactly equal to half the pitch angle and can be defined by the chain pitch I and the pitch radius r, respectivelymaxCalculating (α ═ δ/2 ═ arcsin (I/[ r)max])). As can be seen from fig. 6, in such an arrangement, no gyroscopic effect occurs when the chain is output from the sprocket, since the chain 1 leaves the sprocket 2 in a linear motion.
Claims (11)
1. A method of guiding a chain (1, 17) in the region of a sprocket (2, 16) of a continuous conveyor, wherein the chain (1, 17) is fed linearly to the respective sprocket (2, 16) or drive wheel (25, 25 '), and first a first element (8, 20) on a first link of a strand is engaged onto the sprocket (2, 16) or drive wheel (25, 25'), characterized in that the first link is deflected by the sprocket (2, 16) only after a second element (8, 20) on the first link is fixed by engagement with the sprocket, and the other links on the strand are engaged with the sprocket (2, 16) and deflected in the same way.
2. A method according to claim 1, characterized in that the line of action of the chain (1, 17) fed linearly into the sprocket (2, 16) or the driving wheel (25, 25 ') cuts the pitch circle of the sprocket (2, 16) or the driving wheel (25, 25') like a chord line.
3. A method as claimed in claim 1 or 2, characterized in that roller-type guide elements (7, 21) are provided in the region of the chain (1, 17), which are guided past the chain wheel (2, 16) by means of a rail-like guide profile (11, 23).
4. A method according to claim 1 or 2, characterized in that the output of the links of the chain (1, 17) from the sprocket wheel (2, 16) or the drive wheel (25, 25 ') corresponds to the input thereof into the sprocket wheel (2, 16) or the drive wheel (25, 25').
5. A device operating according to the method of claim 1 for guiding a chain (1, 17) in the region of chain wheels (2, 16), characterized in that the device has a number of chain wheels (2, 16) for diverting a chain (1, 17) connected to a conveying member and drive wheels (25, 25') which may be arranged between the chain wheels (2, 16), which chain (1, 17) comprises a number of link plates (5, 18) and pins (6, 19, 20) connecting them together and roller-type guide elements (7, 8, 21) for effective connection to the conveying member, wherein the chain wheels (2, 16) are designed to be narrower in the region of their outer diameter (3) for supporting the chain track pins (6) or guide elements (8, 20), and in that at least one pin (6) or guide element (8), 20) is arranged in the longitudinal direction of the guide profile (11, 23) and extends over the effective rolling length.
6. A device according to claim 5, characterised in that the chain (1, 17) is fed to the chain wheel (2, 16) in a straight line below a tangent to the chain wheel (2, 16), wherein, seen in the conveying direction of the chain (1, 17), in front of the chain wheel (2, 16) a guide surface (9, 22) is provided which supports the guide element (7, 21), which guide surface (9, 22) extends beside the chain wheel (2, 16).
7. A device according to claim 5 or 6, characterised in that the guide surfaces (9, 22) turn into the guide profiles (11, 23) without transition marks, the guide surfaces (9, 22) extending linearly until two pins (6) or two guide elements (8, 20) on each link of a strand engage with the sprocket wheel (2, 16).
8. An arrangement according to claim 5 or 6, characterized in that the chain guide means are arranged on a line of pitch circles (14) as chord cutting sprockets (2, 16) having a length as chord line at least equal to the chain pitch.
9. A device according to claim 5 or 6, characterized in that the sprockets (2, 16) are provided with involute gear teeth (4).
10. A device according to claim 5 or claim, characterized in that between two engagements of the sprocket, when the angular velocity ω of the sprocket (2, 16) is a constant value, and when the distance between the chain roller and the sprocket axis is r, the velocity of the strands is found according to the following formula:
vT＝ω×r×cos[φ(t)-α]
wherein,
phi (t) is the rotational angle of the sprocket,
alpha is a phase shift, which is determined by the manner in which the chain enters the sprocket,
δ here denotes the pitch angle.
11. The apparatus of claim 10, wherein when v isTAt a constant value, the spacing between the sprocket and the chain rollers matches the sprocket rotational angle φ (t) according to the following formula:
r＝p/cos[φ(t)-α]
wherein p is a proportionality coefficient
p＝(R/r)×cos(α)
Wherein R represents the pitch circle radius of the sprocket.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19835817 | 1998-08-08 | ||
| DE19835817.2 | 1998-08-08 | ||
| DE19849236A DE19849236C2 (en) | 1998-08-08 | 1998-10-26 | Device for guiding a chain in the area of sprockets of a continuous conveyor |
| DE19849236.7 | 1998-10-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1332695A CN1332695A (en) | 2002-01-23 |
| CN1197761C true CN1197761C (en) | 2005-04-20 |
Family
ID=26048015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99815369 Expired - Fee Related CN1197761C (en) | 1998-08-08 | 1999-06-23 | Method and device for guiding chain in region of chain-wheels of continuous transport unit |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1102718B1 (en) |
| CN (1) | CN1197761C (en) |
| WO (1) | WO2000007924A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4458770B2 (en) * | 2002-11-25 | 2010-04-28 | 東芝エレベータ株式会社 | Conveyor device |
| US7500928B2 (en) | 2005-01-20 | 2009-03-10 | Borgwarner Inc. | Randomized chain system |
| JP5176223B2 (en) | 2006-07-04 | 2013-04-03 | インベンテイオ・アクテイエンゲゼルシヤフト | Driving system for passenger transport equipment |
| CN101456516B (en) * | 2007-12-13 | 2013-11-13 | 泰森克鲁普电梯（Es/Pbb）有限公司 | Conveying system for conveying passenger/goods |
| WO2010134223A1 (en) * | 2009-05-20 | 2010-11-25 | 三菱電機株式会社 | Conveyor device |
| TWI612241B (en) * | 2012-12-07 | 2018-01-21 | 伊文修股份有限公司 | Escalator with a step belt, and moving walkway with a plate belt |
| TR201905376T4 (en) * | 2015-04-16 | 2019-05-21 | Inventio Ag | Common return rail escalator. |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2060491A (en) * | 1935-07-26 | 1936-11-10 | Westinghouse Elec Elevator Co | Moving stairway |
| US2111433A (en) * | 1937-03-01 | 1938-03-15 | Otis Elevator Co | Moving stairway |
| US2128310A (en) * | 1937-03-30 | 1938-08-30 | Otis Elevator Co | Moving stairway |
| US2103327A (en) * | 1937-08-18 | 1937-12-28 | Otis Elevator Co | Moving stairway |
| US2570135A (en) * | 1948-07-19 | 1951-10-02 | Robert F Loughridge | Moving stairway |
| DE1009777B (en) * | 1950-10-13 | 1957-06-06 | Otis Elevator Co | Escalator |
| US2663400A (en) * | 1950-10-13 | 1953-12-22 | Otis Elevator Co | Moving stairway |
| DE1809976A1 (en) * | 1968-11-20 | 1970-06-04 | Rheinstahl Eggers Kehrhahn | Reversing station for escalators |
| US4082173A (en) * | 1976-06-10 | 1978-04-04 | Otis Elevator Company | Drive unit for an endless conveyor |
-
1999
- 1999-06-23 EP EP99938208A patent/EP1102718B1/en not_active Expired - Lifetime
- 1999-06-23 CN CN 99815369 patent/CN1197761C/en not_active Expired - Fee Related
- 1999-06-23 WO PCT/EP1999/004359 patent/WO2000007924A1/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2000007924A1 (en) | 2000-02-17 |
| CN1332695A (en) | 2002-01-23 |
| EP1102718B1 (en) | 2002-10-16 |
| EP1102718A1 (en) | 2001-05-30 |
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