CN1140691A - Elevator device - Google Patents
Elevator device Download PDFInfo
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- CN1140691A CN1140691A CN 96101630 CN96101630A CN1140691A CN 1140691 A CN1140691 A CN 1140691A CN 96101630 CN96101630 CN 96101630 CN 96101630 A CN96101630 A CN 96101630A CN 1140691 A CN1140691 A CN 1140691A
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Abstract
Disclosed is an elevator which comprises a steel wire and a rotational pulley around which the steel wire stretches; wherein the steel wire is coated with a layer of steel wire which is Hv 420-460 in hardness and 165kgf/mm<2> in tensile strength; the pulley is made of dense cast vermicular graphite with a speed of 4 800-5 400m/s and a hardness of HB200-250, the dense cast vermicular graphite contains hypoeutectic and the pearlite range under cast state is more than 90%. The steel wire and the pulley which match with each other in use are long in service.
Description
The application is to be on September 12nd, 91 applying date, and application number is 91108989-4, and denomination of invention is divided an application for the application for a patent for invention of " elevator pulley of fine and close vermicular iron and manufacturing thereof ".
The present invention relates to a kind of lift appliance, pulley is wherein made by fine and close vermicular iron.
Such as, a wire rope suspensioning elevator ladder case and is extended around pulley, and the general flake graphite cast iron (iron casting is to call FC in the following text) with the basic structure of pearlitic matrix that adopts of this pulley of drive steel rope is made.FC is suitable for steel rope, and this is because flake graphite makes FC have self-lubricating effect, and FC processes not too expensive again easily.Above said pulley have a rope groove to be used for admitting steel rope so that the required frictional transmission power of steel rope that drives to be provided.The rope groove has a V-arrangement cross-sectional plane, perhaps is recessed form and can contact with the rope trench bottom with the protection steel rope.That is to say that steel rope contacts with the side surface of rope groove with raising pressure therebetween, thereby increase friction force.Although can utilize the wedge shape effect between steel rope and the rope groove to increase friction force, can run into a problem like this, promptly steel rope has aggravated the wearing and tearing of pulley, thereby has shortened the life-span of pulley.
We know that the antiwear property of spheroidal graphite iron (iron casting is to call FCD in the following text) is better than above-mentioned FC, and the basic structure of FCD is the pearlitic matrix (Japanese patent unexamined publication number 57-188645 and 1-123048) of as cast condition.Yet FCD is owing to have compact texture and high hardness, thereby general mach cutting ability is poorer than FC.In addition, the casting cost of FCD is higher.Therefore, FCD is not suitable as the material of making elevator pulley.
Fine and close vermicular iron (to call CV in the following text) was proposed in Japanese patent unexamined publication number 60-248864 and 61-3866.CV aspect mechanical characteristics, physical property, cutting ability and the castability between FC and FCD.
Although the above-mentioned performance of CV is between FC and FCD, and its antiwear property approaches FC, its castability then approaches FCD.And the stability of the pearlitic texture of CV (if basic structure can easily convert pearlitic texture to, then claiming this pearlitic texture to have " stability ") not enough.Therefore, as the cast iron with the performance between FC and FCD, it is very satisfied that CV can't make us.
An object of the present invention is to provide a kind of lift appliance, pulley and the steel rope that uses of wherein working in coordination has high service life.
The objective of the invention is to be achieved through the following technical solutions, a kind of lift appliance comprises a steel rope and a rotatable pulley, and described steel rope extends round pulley, wherein, to have hardness be that Hv420 to 460, tensile strength are 165kgf/mm to described steel rope
2Cover wire, described pulley is that 4,800 to 5,400 meter per seconds, hardness are H by super sonic by speed
B200 to 250, comprise that hypoeutectic composition and its as-cast pearlitic zone percentum is not less than 90% fine and close vermicular iron and makes.
Advantage of the present invention is that the steel rope and the pulley that utilize above-mentioned material to make can improve service life exponentially.
The fine and close vermicular iron that the present invention uses has the hypoeutectic composition, its as-cast pearlitic zone percentum is (on the cast iron micromechanism during as cast condition, being the area of pearlitic matrix part and ratio except the whole zone of as cast condition cast iron graphite, also is area/the remove whole area of cast iron * 100 of graphite of pearlitic matrix part) be no less than 90%.
In the component of above-mentioned composition, C is the key component of indigenous graphite, and Si is the constitutionally stable key component that makes CV.Simultaneously, importantly, be no less than 90% as-cast pearlitic structure in order to stablize its perlitic range percentum, carbon equivalent must be in the scope of hypoeutectic composition.In traditional CV, make graphite have fine and close vermicule shape structure, its CV forms the hypereutectic scope that is positioned at.On the other hand, in the CV that the present invention uses, make graphite have fine and close vermicular texture, its composition is positioned at the hypoeutectic scope, to stablize pearlitic texture.
Fig. 1 is the micro-copy of the metal construction of the fine and close vermicular iron of demonstration the present invention use;
Fig. 2 is the front elevation of elevator pulley;
The lateral plan that Fig. 3 analyses and observe for the part of elevator pulley;
Fig. 4 is for showing the scheme drawing of lift appliance;
Fig. 5 hoists the planar view of device for showing elevator;
Fig. 6 is a pulley wear testing schematic representation of apparatus;
The amplification cross-sectional figure of Fig. 7 for cutting open along the line B-B among Fig. 6;
Fig. 8 is for explaining the scheme drawing of pulley wear state;
Fig. 9 is for showing the diagram of curves of test frequency and pulley abrasion loss relation;
Figure 10 is the scheme drawing of rope endurance testing device;
The amplification cross-sectional figure of Figure 11 for cutting open along the line C-C among Figure 10;
Figure 12 is the cross-sectional figure of the amplification of steel rope;
Figure 13 is for showing rope life test result's diagram of curves;
Figure 14 is for showing the diagram of curves that concerns between the tensile strength and the velocity of sound.
Several embodiment (fine and close vermicule cast iron casting body is to call FCV in the following text) of the novel fine and close vermicular iron of the present invention's use will be described below.
Main raw material(s) such as the steel scrap of the spheroidal graphite pig iron, steel scrap, recovery, Fe-Si, Fe-Mn, limestone or the like and every kind of various auxiliary material that certain proportioning is all arranged be ready to the back in having the cupola furnace of acid lining fusing to obtain melt.Then, melt is carried out a series of additional processes, carry out desulfurization processing, spheroidization of graphite processing, inoculated etc., thereby obtain to have the melt of forming shown in the table one such as the inorganic agent that adds certain proportioning at the fixed time.Every kind of melt is all poured in the mold, when regulating rate of cooling, be cured then, thereby be ready to test specimen by chill.For the test specimen of as-cast condition, test its mechanical characteristics, spheroidization of graphite rate, basic structure pearlitic matrix rate or the like.In table 1, sample 1 and 2 as a comparative example, and sample 3 is embodiments of the invention.
Table 1
| Test piece number (Test pc No.) | Form (percentage by weight) | ||||||||
| ???C | ???Si | ???Mn | ???Sn | ??Cu | ????S | ???Mg | ??P | ????Fe | |
| ????1 | ??3.68 | ??2.64 | ??0.86 | ???-- | ??-- | ??0.008 | ??0.022 | ??-- | ?balance |
| ????2 | ??3.62 | ??2.35 | ??0.02 | ???-- | ??0.55 | ??0.030 | ??0.026 | ??-- | ?balance |
| ????3 | ??3.41 | ??2.29 | ??0.5 | ???0.07 | ??1.06 | ??0.031 | ??0.020 | ??0.05 | ?balance |
Attention: No. 1 and No. 2 is comparative example, and No. 3 is the embodiment of the invention.
Per sample (p.s.) 1 and 2 carbon equivalent (C+1/3 Si) all surpass 4.3% so that hypereutectic to be provided, and the carbon equivalent of sample 3 is no more than 4.3% so that Hypoeutetic Alloy to be provided.Yet in order to stablize P, carbon equivalent (C+1/3 Si) is preferably in 4.0 to 4.3% the scope.The various result of a measurement of sample 1 to 3 are shown in Table 2.
Table 2
| Test piece number (Test pc No.) | Mechanical characteristics | Nodularization rate (%) | Ball light body region percentum (%) | ||
| Tensile strength (kgf/mm 2) | Elongation (%) | Hardness (H B) | |||
| ????1 | ?????50.5 | ????7.6 | ??207 | ???69 | ?????68 |
| ????2 | ?????48.2 | ????3.2 | ??235 | ???67 | ?????74 |
| ????3 | ?????52.5 | ????3.0 | ??248 | ???61 | ?????94 |
Attention: No. 1 and No. 2 is comparative example, and No. 3 is the embodiment of the invention.
* the nodularization rate is by adopting a circle as standard, with the stone of micromechanism
China ink shape grouping averages the numerical value of gained then and obtains.
As shown in Table 2, sample 1 that hypereutectic is formed and 2 perlitic range percentum respectively are 68% and 74%, and the perlitic range percentum of the sample 3 that Hypoeutetic Alloy is formed is increased to 94%, thereby the FCV with stable pearlitic texture is provided.As seen, for the metal construction of the sample 3 of as cast condition, flake graphite has the end of a slyness from the micrography (amplifying 100 times) of Fig. 1, and almost to be the basic structure crystallization of pearlitic matrix completely.Can see also that from table 2 the various mechanical characteristicss of sample 3 (tensile strength, elongation and hardness) are outstanding.
As can be known, the FCV (sample 3) that the present invention uses also comprises Mn, Sn, Cu, S, Mg, P and Fe except comprising C and Si from the chemical composition of table 1.In these were formed, C was the main component that graphite is separated out, and the content of the C that FCV is required is 3.0 to 3.9%.Yet if this content is lower than 3.3%, it is big that the trend of Quench (being the trend of carbide precipitate) becomes, and on the contrary, if this content surpasses 3.8%, is easy to generate double carbide.Therefore, its practical scope is 3.3 to 3.8%, and optimum range is 3.4 to 3.6%.
If the quantity of the Si that adds is not enough, then FCV stable there is counteraction and has promoted Quench trend.On the contrary, if the quantity of the Si that adds is too many, then graphite shape becomes big, thereby basic structure easily becomes double carbide.Therefore, its practical scope is 1.5 to 3.0%, and optimum range is 1.8 to 2.5%.
Mn is an actv. to stablizing pearlitic texture; Yet,, can promote Quench trend if contain a large amount of Mn.Therefore, its preferred range is 0.2 to 0.8%.
Usually, although the Sn addition is limited, it should be noted that the addition that surpasses 0.03% Sn has played effect to stablizing pearlitic texture.Yet if Sn content surpasses 0.25%, the shape of graphite becomes sheet, thereby can not obtain the graphite shape of FCV.Therefore, its preferred range is 0.03 to 0.2%.
Usually,, it should be noted that the addition that is no less than 0.25% Cu can make FCV have pearlitic texture although the addition of Cu is also limited, also useful to increasing yield strength and toughness.Yet,, in structure, easily produce eduction if Cu content surpasses 2.0%.Therefore, its preferred range is 0.25 to 1.5%.
In the present invention, to add S certainly.S is the composition that is used for preventing spheroidization of graphite.If S content is less than 0.01%, then graphite is by nodularization, and the cast iron that obtains approaches spheroidal graphite iron, thereby increased amount of contraction.As a result, this contraction is easy to generate the casting defect such as the space.On the contrary, if S content surpasses 0.09%, graphite slabbing then, thus can not obtain stable FCV.Therefore, its preferred range is 0.01 to 0.08%.
If the content of Mg is lower than 0.005%, graphite slabbing then.On the contrary, if this content surpasses 0.04%, graphite glomeration then.Under two kinds of situations, the casting defect such as slag inclusion can take place, therefore, its preferred range is 0.005 to 0.04%.
If the content of P surpasses 0.1%, then in basic structure, can separate out iron phosphide (steadite), it is a kind of hard material.In this case, when pulley and so on is made with this cast iron, around the wearing and tearing too early of top steel wire rope.Therefore, P content should be decided to be and is no more than 0.1%.
As mentioned above, in the FCV that the present invention uses, pearlitic texture can be stabilized in the perlitic range percentum and be no less than 90%, and can obtain to have the FCV of outstanding antiwear property.And above-mentioned FCV can obtain under as cast condition, thereby need not any processing after cast iron solidifies, and can obtain the superior FCV of castability.
Below in conjunction with accompanying drawing 2 to 5 elevator pulley that adopts above-mentioned FCV to make is described.Generally in lift appliance, be equipped with in the machine chamber 2 at access to elevators 1 top and hoist device 3.This hoists device and makes terraced case 9 (aftermentioned) upstream or downstream.Hoist that device 3 comprises an electrical motor 4, is used for reducing the retarder 5, a pulley that links to each other with the output shaft of retarder 5 of electrical motor 4 rotating speeds, the electromagnetic brake 7 of input shaft that is used for brake retarder 5.Pulley 6 has a plurality of rope groove 6G that form on its outer peripheral edges.Steel rope 8 extends round rope groove 6G separately.The two ends of steel rope 8 link to each other with the balance block 10 of 1 li of terraced case 9 and access to elevators respectively.When electrical motor 4 rotated pulley 6, steel rope 8 moved by the friction force between steel rope 8 and the rope groove 6G, thereby makes terraced case 9 upstream or downstream.
In order determine to adopt pearlitic matrix to be not less than the effect of the elevator pulley that 90% FCV makes as basic structure and perlitic range percentum, the proving installation among employing Fig. 6 and Fig. 7 has carried out wear testing (life test).Proving installation comprises pulley test specimen 20a and the 20b that two groups of levels separate, one idle pulley 21 is between two groups of pulley test specimen 20a and 20b but be higher than them, one drive wheel 22 and tension adjustment wheel 23 is positioned at the outside of pulley test specimen 20a and 20b but is lower than these pulleys, and steel rope 8 is linked to be the form of no end and is taken turns 23 and extend around pulley test specimen 20a and 20b, idle pulley 21, drive wheel 22 and tension adjustment by attaching parts 24.Two groups of pulley test specimen 20a and 20b are installed in respectively in two rotating shafts 25.26, two sprocket wheel 27a of bearing and 27b that one end of two rotating shafts 25 passes separately are installed in respectively on this end of two rotating shafts.The number of teeth of the number of teeth of sprocket wheel 27a and sprocket wheel 27b is slightly different.One chain 28 is around two sprocket wheel 27a and 27b and extend.Actuating device 30 is linked to each other with drive wheel 22 by axle drive shaft 29, and hydraulic efficiency gear 31 links to each other with the distance between adjustment of tonicity adjusting knurl 23 and the drive wheel 22 with tension adjustment wheel 23.
In the proving installation of said structure,, thereby steel rope 8 is moved along arrow a among Fig. 6 and b direction along normal direction and opposite sense driver 30 repeatedly.At this moment, as mentioned above, because the number of teeth of sprocket wheel 27a and 27b is slightly different, thereby the circumferential speed of pulley sample 20a is different with the circumferential speed of pulley sample 20b, produce slight the slip between steel rope 8 and pulley test specimen 20a and the 20b, thereby make pulley test specimen 20a and 20b force wearing and tearing.Except employing makes the number of teeth of the sprocket wheel 27a mode different with the number of teeth of sprocket wheel 27b, also can adopt the rotating speed or the different mode of external diameter of the rotating speed that makes one group of pulley test specimen or external diameter and another group pulley test specimen.
As pulley test specimen 20a and 20b, with adopt with pearlitic matrix as basic structure and perlitic range percentum be no less than pulley that 90% FCV makes, the pulley that adopts pulley that FCD with the basic structure of pearlitic matrix makes and employing FC to make is installed in the above-mentioned proving installation and carry out compare test.
As a kind of estimation method of pulley test specimen worn-down, because the wearing and tearing of pulley test specimen 20, steel rope moves on to position 8b from the position 8a shown in Fig. 8.The cross-sectional area 32 of measuring wearing part is as pulley abrasion loss (mm
2).When measuring this pulley abrasion loss, adopt the wearing part molding of Modeling Material, measure the cross-sectional area of this mould then with the ratio of amplifying according to pulley.
Fig. 9 has shown the result of above-mentioned compare test of the wearing and tearing (life-span) of pulley test specimen.Show very clearly at Fig. 9, adopt the abrasion loss of the pulley that FCV makes to be significantly less than the abrasion loss of the pulley made from FC, and antiwear property identical with the FCD pulley substantially.
Reach 95% although make the perlitic range percentum of the FCV of above-mentioned pulley test specimen, and adopt the test of same pulley wear testing device to determine that as long as the perlitic range percentum is no less than 90%, FCV just has good antiwear property.Especially, determined that antiwear property will descend 30 to 40% when the perlitic range percentum is 80%.
Have been found that the pulley life-span can surpass 56,000 kilometers range ability when the rotation amount with above-mentioned FCV pulley when to be transformed into speed be 105 meters/minute the range ability of standard lift.56,000 kilometers range ability is equivalent to the range ability that every month time of run is the above-mentioned standard lift of 120 hours (this is by the decision of elevator real-world operation).And 105 meters/minute be the maximum speed of standard lift.56,000 kilometers above-mentioned range ability is equivalent to about 7 years used life.Therefore pulley of the present invention is compared on antiwear property with those traditional pulleys that will renew in 3 to 5 years and has been improved greatly.
Then, in order to determine that FCV pulley of the present invention (device that hoists that is used for elevator) to the influence of steel rope, has adopted the proving installation shown in Figure 10 and Figure 11 to carry out the life test of steel rope.
In Figure 10, pulley test specimen 20a and 20b and idle pulley 21 are arranged to steel rope test specimen 33 in the mode of two S shapes around its extension, and steel rope test specimen 33 is crooked like this.This proving installation is roughly similar to above-mentioned pulley emery wheel proving installation, and difference only is not have sprocket wheel 28 and be structure shown in Figure 11.More specifically, Figure 11 is the cross-sectional figure that the line C-C along Figure 10 cuts open, shows the bench section of pulley test specimen 20a.The pulley test specimen 20a that each steel rope 33 centered on and extended rotatably is supported on the axle 25 by independent separately plain bearing 34, and rotatable being bearing on the bearing 26 in two ends of axle 25.Adopt this structure, can carry out the continuous bend test of steel rope 33, i.e. the flexural fatigue damage test (life test) of steel rope 33.
As the pulley test specimen, pulley that adopts FCV of the present invention to make and the pulley that adopts FC to make are installed in the above-mentioned rope service-life proving installation.The cross-sectional plane of a routine steel rope test specimen 33 that is used in combination with these pulleys is shown among Figure 12.In Figure 12, steel rope comprises steel core 35 and stranded rope 36.Each stranded rope 36 is made up of three kinds of finer wires, i.e. cover wire 37, middle level steel wire 38 and core steel wire 39.
The tensile strength of its cover wire 37 is about 135kgf/mm
2Steel rope be called " E type steel rope ", generally as the steel rope of elevator.Therefore, this steel rope is used in combination with the pulley test specimen of above-mentioned FC.
The about 165kgf/mm of the tensile strength of its cover wire 37
2Steel rope be called " A type steel rope ".This steel rope is used in combination with FCV pulley test specimen of the present invention, and carries out the rope service-life test.
Figure 13 has shown the result of steel wire life-span compare test, and wherein above-mentioned two kinds of pulley test specimens combine practicality with above-mentioned steel rope test specimen respectively, and this test adopts above-mentioned proving installation to carry out.Figure 13 shown steel rope 33 reciprocating number of times (being the number of bends of steel rope test specimen) and the damaged condition (i.e. the radical of Duan Lie steel wire 37) of the cover wire 37 that contacts with pulley between relation.Show very clearly among Figure 13, the damage rate of the A steel rope that combines with FCV pulley test specimen of the present invention is compared with the damage rate of the E type steel rope that combines with FC pulley test specimen and is greatly reduced, and therefore can know the hinge lifting device that A type steel rope combines and is suitable as elevator with the FCV pulley.Specifically, really the damage rate of steel rope reduced about 50%.
The about 165kgf/mm of its cover wire tensile strength
2A type steel rope describe in detail, the preferable hardness of the cover wire of the certain this steel rope of test of class examination is Hv420 to 460.
The nondestructive testing that the FCV that adopts super sonic that the present invention is used carries out then will be described.We know, usually, the hypracoustic by cast iron by speed be with cast iron in graphite shape relevant certainly.Therefore, grasped the mechanical characteristics of cast iron and hypracoustic, exactly super sonic has been applied on the cast iron, just can classify the graphite shape in the cast iron by after the relation between the speed.The FCV that the present invention is used has carried out ultrasonic investigation.The test result of Figure 14 has shown that cast iron tensile strength (mechanical characteristics) and hypracoustic are by the relation between the speed.The pulley of having prepared to adopt FCV to make, adopt the pulley that FCD makes and adopt pulley that FC makes, found the active strength (tensile strength) of these test specimens and the relation between the ultrasonic velocity as the cast iron test specimen.See too clearly among Figure 14, the zone of FCV can confirm that ultrasonic velocity in the FCV zone is at 4,800 meter per seconds to 5, in the scope of 400 meter per seconds between FC zone and FCD zone.Similarly, when concerning between the hardness of measuring FCV and the ultrasonic velocity, find and 4,800 meter per seconds to 5 that the corresponding hardness of the ultrasonic velocity of 400 meter per seconds is H
B200 to H
B250.
Even when having adopted rate of cooling control apparatus such as chill, still can obtain having stable pearlitic texture and the perlitic range percentum is no less than 90% FCV with rate of cooling when solidifying of the FCV (comprising hypoeutectic forms) that regulates the present invention and use.
Claims (1)
1. a lift appliance comprises a steel rope and a rotatable pulley, and described steel rope extends round pulley, it is characterized in that it is that Hv420 to 460, tensile strength are 165kgf/mm that described steel rope has hardness
2Cover wire, described pulley is that 4,800 to 5,400 meter per seconds, hardness are H by super sonic by speed
B200 to 250, comprise that hypoeutectic composition and its as-cast pearlitic zone percentum is not less than 90% fine and close vermicular iron and makes.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2247584A JP2624886B2 (en) | 1990-09-19 | 1990-09-19 | Elevator equipment |
| JP247584/90 | 1990-09-19 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91108989 Division CN1032873C (en) | 1990-09-19 | 1991-09-12 | Compact vermicular graphite cast iron and sheave made of same for elevator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1140691A true CN1140691A (en) | 1997-01-22 |
Family
ID=17165680
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91108989 Expired - Fee Related CN1032873C (en) | 1990-09-19 | 1991-09-12 | Compact vermicular graphite cast iron and sheave made of same for elevator |
| CN 96101630 Pending CN1140691A (en) | 1990-09-19 | 1996-01-04 | Elevator device |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91108989 Expired - Fee Related CN1032873C (en) | 1990-09-19 | 1991-09-12 | Compact vermicular graphite cast iron and sheave made of same for elevator |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2624886B2 (en) |
| CN (2) | CN1032873C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109183472A (en) * | 2018-08-06 | 2019-01-11 | 江苏鸿泽不锈钢丝绳有限公司 | Automobile clutch wirerope |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BR0105987B1 (en) * | 2001-11-27 | 2009-08-11 | high machinable vermicular cast iron. | |
| BR0105988B1 (en) * | 2001-11-27 | 2009-08-11 | High machinability and microporosity-free vermicular cast iron. | |
| BR0105989B1 (en) * | 2001-11-27 | 2009-08-11 | graphically cast iron of high mechanical resistance. | |
| KR101605905B1 (en) * | 2009-12-22 | 2016-03-23 | 두산인프라코어 주식회사 | Cgi cast iron and preparation method thereof |
| KR101822203B1 (en) * | 2011-12-23 | 2018-03-09 | 두산인프라코어 주식회사 | Preparation method of high strength flake graphite iron and flake graphite iron preparaed by the same method, and engine body for internal combustion engine comprising the same |
| KR102075802B1 (en) * | 2013-03-22 | 2020-02-11 | 두산인프라코어 주식회사 | High strength flake graphite iron having excellent workability and preparation method |
| CN104745916B (en) * | 2013-12-30 | 2017-05-24 | 重庆铜梁渝和实业有限公司 | Automobile brake drum and manufacturing method |
| CN113767061B (en) * | 2019-05-17 | 2023-05-16 | 因温特奥股份公司 | Elevator operating roller, elevator installation and method for producing an elevator operating roller |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5917184B2 (en) * | 1977-02-09 | 1984-04-19 | 日立金属株式会社 | As-cast pearlite terrestrial graphite cast iron |
| JPS613866A (en) * | 1984-06-18 | 1986-01-09 | Toa Koki Kk | Wear resistant, tough and hard cast iron and its manufacture |
| JPS61227149A (en) * | 1985-04-01 | 1986-10-09 | Aisin Takaoka Kk | Cv graphite cast iron of pearlite matrix. |
-
1990
- 1990-09-19 JP JP2247584A patent/JP2624886B2/en not_active Expired - Fee Related
-
1991
- 1991-09-12 CN CN 91108989 patent/CN1032873C/en not_active Expired - Fee Related
-
1996
- 1996-01-04 CN CN 96101630 patent/CN1140691A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109183472A (en) * | 2018-08-06 | 2019-01-11 | 江苏鸿泽不锈钢丝绳有限公司 | Automobile clutch wirerope |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04128340A (en) | 1992-04-28 |
| CN1032873C (en) | 1996-09-25 |
| CN1059939A (en) | 1992-04-01 |
| JP2624886B2 (en) | 1997-06-25 |
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