CN204079150U - A kind of Novel elevator falling prevention device - Google Patents
A kind of Novel elevator falling prevention device Download PDFInfo
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- CN204079150U CN204079150U CN201420483992.3U CN201420483992U CN204079150U CN 204079150 U CN204079150 U CN 204079150U CN 201420483992 U CN201420483992 U CN 201420483992U CN 204079150 U CN204079150 U CN 204079150U
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- brake control
- control lever
- bearing
- control levers
- elevator
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Abstract
The utility model relates to a kind of Novel elevator falling prevention device, be connected with elevator lifting rod, bearing is arranged on cage bottom or top, at the avris of described bearing, two brake control levers in left and right are housed, two brake control levers are symmetricly set in the both sides of guide rail, be provided with chute in one end of described brake control lever, coordinated with the load-bearing bearing pin be arranged on bearing by described chute; On described brake control lever, be also provided with friction part, the both sides of described friction part and guide rail keep certain interval; The other end of two brake control levers in described left and right is by adapter shaft pivot joint.The utility model is simple and compact for structure, by cancelling the structure of link-type in the past, replace and about two brake control levers are articulated, swivel point using adapter shaft as two brake control levers, thus make two brake control levers in course of action, remain consistent, avoid two brake control levers free on priority and height on position, thus solve " asymmetry " may appear in former brake control lever phenomenon in clamp position.
Description
Technical field
The utility model relates to lift facility field, particularly relates to a kind of Novel elevator falling prevention device.
Background technology
" elevator anti-fall device " is the necessary parts of elevator, and elevator is when normally running, and it is in off working state.Only have when elevator runs and speed has exceeded permissible value when fracture (comprise suspension gear) downwards, falling proof device just can be driven by elevator governor, make it clamp guide rail by a pull lift action and produce friction force, also finally quiescence is kept to elevator emergency brake.When touching upon anti-fall device, " braking force " is consistent with the concept of " friction force ", and " Clamping force " is the source of the generation of " friction force ".
Anti-fall device is often referred to " elevator safety gear ".Existing elevator safety gear is a kind of device with fixed clamp power, and Clamping force comes from the distortion of spring.The spring adopted in existing safety tongs relates to polytype (as butterfly spring, spiral spring, U-board spring etc.), thus causes the variation of safety tongs version, is unfavorable for large-scale production, more do not talk universalization, seriation.Along with expanding economy, the demand of elevator is also being changed.The load of elevator is in increasing, and speed is in improve, and the braking potential of safety tongs also must improve.This just requires, for safety tongs provides the spring sizes of Clamping force also to strengthen thereupon, to bring certain technical risk, also make the cost of safety tongs greatly improve.
From classical mechanics principle a=f/m formula, any object is when quality m determines, the size of acceleration of motion a depends on the size of suffered external force f.Due to the increase of elevator load, elevator specification increases, and the load capacity in addition during elevator each run is different, and for the conventional security pincers with fixed clamp power, the emergency braking of each safety tongs, will produce different braking deceleration angle value.Braking deceleration is crossed conference and is produced larger impact, and cause the destruction of elevator structure or the injury of personnel, too small meeting makes the oversize distance of lift car slippage, too much occupies ele-vator shaft spaces.Reply way can only be the segmentation of safety tongs specification, to adapt to the elevator of different size load, causes production and administration cost to improve.So the safety tongs of classical architecture in use also exists the drawback being difficult to overcome.The allowed band giving " braking deceleration " in GB7588 " elevator manufacture and installation safety standard " is between 0.2g ~ 1.0g.
At present, " Novel elevator falling prevention device " that be ZL201120214570.2 about the patent No. discloses following structure: " support installing is at cage bottom; support avris is equipped with two brake control levers in left and right and connecting rod; two brake control levers are symmetricly set in elevator T type guide rail both sides: one end of brake control lever is provided with chute, are coordinated with the set pin on support by chute; The medial extremity of brake control lever is friction side, maintains certain interval, be articulated in the middle part of brake control lever by gear pin and connecting rod with the both sides of T-shaped guide rail, symmetrical pivot joint left and right, connecting rod two ends brake control lever." each brake control lever 3 is stressed in this structure, is similar to lever, elevator total weight, through suitably arranging, can be converted into the Clamping force to guide rail, thus realize the emergency braking of elevator by three stress point positions of brake control lever by a certain percentage.From mechanics principle a=f/m, when braking force changes along with quality of loads, elevator will obtain constant braking deceleration, improves the deceleration and stopping performance of anti-fall device greatly, is the significant innovation to conventional security pincers.
But there are the following problems for this above-mentioned Novel elevator falling prevention device:
One, the car of elevator is a component by wire rope suspensioning, although there is cage guide to lead, but there is necessary gap between lift car and guide rail, in car, the uneven distribution of load can make car that " unbalance loading " phenomenon occurs, as shown in Figure 1, cause car axis A to depart from center line of guide rail B, change with the gap of guide rail both sides.Because connecting rod in this kind of elevator safety gear and two brake control levers have too much space motion degree of freedom, non-symmetrical clamping may be there is in this case, thus impact clamping quality.
Two, this elevator safety wrench structure will take into account following situation when designing: as shown in Figure 2, namely the horizontal sextant angle α of line between the pivoting point (being also that brake control lever is realizing the rotary middle point of clamping process) of brake control lever 101 and connecting rod 102 and the wipe contact point of brake control lever 101 and guide rail 2, must meet α > α
0requirement, wherein α
0=arctg μ is this mechanism " self-locking critical angle ", and μ is the friction coefficient between brake control lever friction part and guide rail.As α≤α
0time, guide rail 2, connecting rod 102, brake control lever 101 three form " self-locking " mechanism, once brake control lever 101 contacts with guide rail 103, just will be in " self-locking " and keep this state constant, the Clamping force of generation can not discharge.Here, the friction part of guide rail 2 and brake control lever 101 is all " rigidity " object in physical significance, under actual condition, the contact-impact time of brake control lever 101 friction part and guide rail 2 is very brief, from physics impulse principle f* △ t=m*v, very brief " △ t " (this impulsive force is namely to the Clamping force of guide rail by causing very large instant impact " f ", can not discharge once produce), cause very large braking deceleration (by a=f/m).In this case, the increase of braking deceleration and impulsive force is the relation that a forward promotes, cause the sharply rising of braking deceleration, elevator is braked in very short time, becomes one " instantaneous safety ", the original intention of complete out of reach design.Only at α > α
0when, avoid mechanism to occur " self-locking ", elevator weight could be converted into Clamping force in required ratio by said mechanism, reaches the object of utility model.(analyze about this mechanism condition of self-locking and the concept of " instantaneous formula " safety tongs, do not launch at this, belong to the Conventional wisdom in respective field).
Utility model content
The applicant, for above-mentioned existing issue, is studied improvement, provides a kind of Novel elevator falling prevention device, makes the utility model operationally, and two brake control levers remain symmetrical, avoid occurring asymmetric clamping phenomenon, substantially increase clamping quality.
The technical scheme that the utility model adopts is as follows:
A kind of Novel elevator falling prevention device, be connected with elevator lifting rod, bearing is arranged on cage bottom or top, at the avris of described bearing, two brake control levers in left and right are housed, two brake control levers are symmetricly set in the both sides of guide rail, be provided with chute in one end of described brake control lever, coordinated with the load-bearing bearing pin be arranged on bearing by described chute; On described brake control lever, be also provided with friction part, the both sides of described friction part and guide rail keep certain interval; The other end of two brake control levers in described left and right is by same adapter shaft pivot joint.
Its further technical scheme is:
Described chute is the one in closed slotted hole, open type chute or open type chute;
The friction part of described brake control lever is active radial type structure, is connected with described brake control lever by jointed shaft;
The friction part of described brake control lever is inserted-blade type structure, and friction lining is connected with described brake control lever by fastener;
Also pilot hole is had in the avris center of described bearing.
The beneficial effects of the utility model are as follows:
The utility model has constant braking deceleration, and for the elevator load of change, the utility model can corresponding change braking force thus guarantee constant braking deceleration.Adopt this programme in theory, the utility model need not be subdivided into some specifications by elevator rated load difference again, reduce production and administration cost.
Constant braking deceleration has following advantage:
Braking deceleration is set in certain desirable value, such as 0.6g, can take into account the comfort and safety taken.
Constant braking deceleration makes deceleration distance constant; The elevator of same command speed (this command speed refers to that elevator constant velocity runs), when emergency braking, its speed is determined, when braking deceleration is for determining, application elevator of the present utility model is made to have a deceleration distance determined, thus the space of improvement can be provided to elevator hoistways design, such as reduce the requirement to the well pit degree of depth, reduce the requirement etc. to energy disperser.
The utility model also has the following advantages:
The utility model is simple and compact for structure, by cancelling the structure of link-type in the past, replace and about two brake control levers are articulated, swivel point using adapter shaft as two brake control levers, thus make two brake control levers in course of action, remain consistent, avoid two brake control levers free on priority and height on position, thus solve " asymmetry " may appear in former brake control lever phenomenon in clamp position, ensure that two brake control levers are relative to the symmetry of guide rail, substantially increase clamping quality.Elevator weight can be converted into Clamping force in required ratio by the utility model in addition, avoids occurring " self-locking " phenomenon.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that asymmetric clamping situation appears in existing elevator anti-fall device.
Fig. 2 is the stressed schematic diagram of existing elevator anti-fall device.
Fig. 3 is front view of the present utility model.
Fig. 4 is the birds-eye view of Fig. 3.
Fig. 5 is the contrast schematic diagram of the utility model in clamping with non-clamping state.
Fig. 6 is the schematic diagram that brake control lever adopts inserted-blade type structure.
Fig. 7 is the schematic diagram that brake control lever adopts active radial type structure.
Fig. 8 is the schematic diagram that in the utility model, single brake control lever is in clamping borderline balance state.
Fig. 9 is the schematic diagram that in the utility model, single brake control lever is in clamp position.
Wherein: 101, brake control lever; 102, connecting rod; 1, bearing; 2, guide rail; 3, elevator lifting rod; 4, chute; 41, open type chute; 42, open type chute; 5, load-bearing bearing pin; 7, friction part; 701, jointed shaft; 702, friction lining; 8, adapter shaft; 9, pilot hole.
Detailed description of the invention
Below in conjunction with accompanying drawing, detailed description of the invention of the present utility model is described.
As shown in Figure 3 to Figure 4, a kind of Novel elevator falling prevention device, be connected with elevator lifting rod 3, bearing 1 is arranged on cage bottom or top, at the avris of bearing 1, two brake control levers 101 in left and right are housed, two brake control levers 101 are symmetricly set in the both sides of guide rail 2, are provided with chute 4 in one end of brake control lever 101, are coordinated with the load-bearing bearing pin 5 be arranged on bearing 1 by chute 4; On brake control lever 101, be also provided with friction part 7, friction part 7 keeps certain interval with the both sides of guide rail 2; The other end of two brake control levers 101 in left and right is by the pivot joint of same adapter shaft 8.Also have pilot hole 9 in the avris center of bearing 1, adapter shaft 8 runs through pilot hole 9.Above-mentioned elevator lifting rod 3 is elevator self structure with guide rail 2, does not belong to the part in the utility model.
Certainly, the chute 4 coordinated with load-bearing bearing pin 5 can be not only closed slotted hole in Fig. 1, also can be the open type chute 41 in Fig. 6, or the open type chute 42 in Fig. 7, equally also can realize the purpose of this utility model.
Consider the wear problem of the friction part 7 of brake control lever 101, in the utility model, the friction part 7 of brake control lever 101 can also make active radial type structure (as Fig. 7) or inserted-blade type structure (as Fig. 6), to be convenient for changing the end be worn; And select the high-abrasive material different with brake control lever 101 by from the part of guide rail contact, the high-abrasive materials such as such as copper alloy, powdered metal material or pottery, increase resistance to abrasion.As shown in Figure 7, active radial type friction part is connected with described brake control lever 101 by jointed shaft 701.As shown in Figure 6, the friction lining 702 of inserted-blade type friction part is connected with brake control lever 101 by fastener.
Specific works process of the present utility model is as follows:
When elevator normally runs, as shown in Figure 4, two brake control levers 101 in left and right under gravity with adapter shaft 8 for pivot point whereabouts, and rely on load-bearing bearing pin 5 to support, now the friction part 7 of two brake control levers 101 in left and right keeps certain interval t with the both sides of guide rail 2, and whole device moves with lift car.
When the descending generation hypervelocity of elevator, velocity limiter is triggered action, elevator lifting rod 3 is upwards lifted relative to car, thus drive adapter shaft 8 upward movement in pilot hole 9, as shown in Figure 4, because the other end of two brake control levers 101 in left and right is by a total adapter shaft 8 pivot joint, therefore two brake control levers 101 in left and right are also upwards mentioned (as shown in solid line in Fig. 4), rotate round adapter shaft 8, because one end chute 4 of brake control lever 101 is Long Circle hole, therefore allow brake control lever 101 while rotating around load-bearing bearing pin 5, produce certain displacement by Long Circle hole and load-bearing bearing pin 5 to avoid being stuck, the friction part 7 of brake control lever 101 upwards and with the both sides of guide rail 2 gradually close, contact and abut guide rail 2, two, left and right brake control lever 101 acts on simultaneously, jointly forms the clamping to guide rail 2, thus realizes the emergency braking to elevator.
In the utility model, brake control lever 101 is 3 stressed members, with adapter shaft 8 for fulcrum, chute 4 place, brake control lever 101 one end is for bearing force, bear the load from elevator, the friction part 7 of brake control lever 101 is for exporting force, implement clamping to guide rail 2, the Clamping force size of brake control lever 101 pairs of guide rails 2 depends on stress point mutual alignment and the elevator gross load of brake control lever 101.Specifically, under elevator brake state, the left and right two that the gross load of elevator is evenly distributed on car (bottom or top) is overlapped on four brake control levers 101 of the present utility model, force analysis is made as component using a brake control lever 101, as shown in Figure 8, using adapter shaft 8 as fulcrum, downward elevator load power P is subject at the slotted hole place of brake control lever 101 one end chute 4, now using adapter shaft 8 as fulcrum, at adapter shaft 8, place is subject to horizontal pull K, friction part 7 is subject to the guide rail counter-force N of horizontal direction (pointing to brake control lever 101), if the friction coefficient between the end of friction part 7 and guide rail 2 is μ.When brake control lever 101 is in critical state of equilibrium (as shown in Figure 8):
K=N formula (1)
P=F=N* μ formula (2)
K*h=L
0 * P=L
0n* μ formula (3)
Above-mentioned (1), (2), (3) are merged evolution, μ=h/ L can be obtained
0formula (4)
L in above-mentioned (1), (2), (3) formula
0be the distance between loading force P to friction force F, h is the distance between horizontal pull K and guide rail counter-force N.Known when brake control lever 101 is in clamping borderline balance state by above-mentioned calculating formula, the load of braking deceleration and car has nothing to do.
If car gross load quality is M, make braking deceleration be a=0.6g, then have: F=M (a+g)=1.6Mg, wherein the braking friction of F needed for car (braking force), (note, F is the friction force from four brake control levers here).
So, move outside the load-bearing bearing pin 5 on bearing 1, make L=1.6L
0and other condition is constant, as shown in Figure 9, corresponding to above-mentioned formula group (1), (2), (3), known N '=1.6N, thus maximum static friction force F '=1.6N μ=1.6F, increase 1.6 times, i.e. F ' > F.When the friction part 7 of known brake control lever 101 contacts with the both sides of guide rail 2 and clamps, braking deceleration will be 0.6g.And the friction force F ' being in clamp position is enough to make car to keep static not fall.
More than describing is to explanation of the present utility model, and be not the restriction to utility model, the utility model limited range is see claim, and when without prejudice to basic structure of the present utility model, the utility model can do any type of amendment.
Claims (5)
1. a Novel elevator falling prevention device, be connected with elevator lifting rod (3), bearing (1) is arranged on cage bottom or top, at the avris of described bearing (1), two brake control levers (101) in left and right are housed, two brake control levers (101) are symmetricly set in the both sides of guide rail (2), be provided with chute (4) in one end of described brake control lever (101), coordinated with the load-bearing bearing pin (5) be arranged on bearing (1) by described chute (4); On described brake control lever (101), be also provided with friction part (7), described friction part (7) keeps certain interval with the both sides of guide rail (2); It is characterized in that: the other end of two brake control levers (101) in described left and right is by the pivot joint of same adapter shaft (8).
2. a kind of Novel elevator falling prevention device as claimed in claim 1, is characterized in that: described chute (4) is closed slotted hole, one in open type chute or open type chute.
3. a kind of Novel elevator falling prevention device as claimed in claim 1, is characterized in that: the friction part (7) of described brake control lever (101) is active radial type structure, is connected with described brake control lever (101) by jointed shaft (701).
4. a kind of Novel elevator falling prevention device as claimed in claim 1, is characterized in that: the friction part (7) of described brake control lever (101) is inserted-blade type structure, and friction lining (702) is connected with described brake control lever (101) by fastener.
5. a kind of Novel elevator falling prevention device as claimed in claim 1, is characterized in that: also have pilot hole (9) in the avris center of described bearing (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420483992.3U CN204079150U (en) | 2014-08-26 | 2014-08-26 | A kind of Novel elevator falling prevention device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420483992.3U CN204079150U (en) | 2014-08-26 | 2014-08-26 | A kind of Novel elevator falling prevention device |
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| Publication Number | Publication Date |
|---|---|
| CN204079150U true CN204079150U (en) | 2015-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420483992.3U Expired - Fee Related CN204079150U (en) | 2014-08-26 | 2014-08-26 | A kind of Novel elevator falling prevention device |
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| CN (1) | CN204079150U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106395546A (en) * | 2016-11-29 | 2017-02-15 | 北京联合大学 | Safe anti-falling device |
| CN108394784A (en) * | 2018-04-11 | 2018-08-14 | 波士顿电梯（湖州）有限公司 | The wheeled safety device of elevator fall arrest |
| WO2019029314A1 (en) * | 2017-08-08 | 2019-02-14 | 无锡市一品电梯配件有限公司 | Safety gear with constant brake deceleration |
-
2014
- 2014-08-26 CN CN201420483992.3U patent/CN204079150U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106395546A (en) * | 2016-11-29 | 2017-02-15 | 北京联合大学 | Safe anti-falling device |
| CN106395546B (en) * | 2016-11-29 | 2019-01-25 | 北京联合大学 | A kind of safety anti-falling device |
| WO2019029314A1 (en) * | 2017-08-08 | 2019-02-14 | 无锡市一品电梯配件有限公司 | Safety gear with constant brake deceleration |
| CN108394784A (en) * | 2018-04-11 | 2018-08-14 | 波士顿电梯（湖州）有限公司 | The wheeled safety device of elevator fall arrest |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150107 Termination date: 20150826 |
|
| EXPY | Termination of patent right or utility model |