CN111735712A - Step chain life test device - Google Patents
Step chain life test device Download PDFInfo
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- CN111735712A CN111735712A CN202010693314.XA CN202010693314A CN111735712A CN 111735712 A CN111735712 A CN 111735712A CN 202010693314 A CN202010693314 A CN 202010693314A CN 111735712 A CN111735712 A CN 111735712A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/14—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by dead weight, e.g. pendulum; generated by springs tension
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0032—Generation of the force using mechanical means
- G01N2203/0033—Weight
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/028—One dimensional, e.g. filaments, wires, ropes or cables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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Abstract
The invention discloses a step chain service life testing device, which comprises a base, a driving mechanism and a load mechanism, wherein the driving mechanism is used for simulating the operation of a step chain; the driving mechanism comprises a servo motor arranged on the base, a driving chain wheel coupled to the base in a shaft mode, and a driven chain wheel coupled to the base in a sliding mode; the driving chain wheel is in transmission connection with the servo motor; the driving chain wheel and the driven chain wheel are matched with each other on the same plane and used for installing the step chain to be tested and driving the step chain to run; the load mechanism comprises a hinge lever and a counterweight component, wherein the fulcrum is hinged to the base; the power arm of the hinge lever is connected with the counterweight component, and the resistance arm of the hinge lever is connected with the driven sprocket, so that the vertical downward gravity borne by the counterweight component is converted into a tensile force along the sliding direction of the driven sprocket, and the driven sprocket is pulled towards the direction far away from the driving sprocket so as to simulate the load bearing load of the step chain to be tested. The device exerts heavy burden load to the step chain through the gravity of counter weight subassembly, practices thrift a large amount of energy, the cost is reduced.
Description
Technical Field
The invention belongs to the technical field of elevator detection, and particularly relates to a step chain service life testing device.
Background
The escalator step chain is a chain structure which is arranged on two sides of an escalator and used for providing a transmission effect. The long-time work under the load of full-load passenger can make the round pin axle wearing and tearing of chain structure, if the whole of the serious chain structure of many places round pin axle wearing and tearing of chain structure can extend, when the wearing and tearing of each round pin axle all reach the fracture limit, the elongation of chain structure reaches the limit, then step chain life-span is ended.
In order to ensure the safety of the escalator, the service life of the step chain used by the escalator needs to be tested, and the data of the extension change of the step chain is recorded, so that the purpose of verifying whether the step chain of the escalator in use reaches the service life limit or not by measuring the length and timely replacing the step chain is achieved.
When the service life of the step chain is tested by the testing device, the load needing to be loaded is large, and the time is long. If a conventional drive device butt-support type or a chain service life test device of torque loading equipment is adopted, energy consumption is huge in a long-time simulation step chain full-load passenger load process, damage to the drive device or the torque loading equipment is large, and cost is very high.
Disclosure of Invention
The gravity of the counterweight component is converted into a load applied to the step chain to be tested through the hinge lever, so that a large amount of energy consumed by a driving device or torque loading equipment for acting on the step chain to be tested is saved. The cost of the step chain life test is greatly reduced.
The invention is realized by the following technical scheme:
a life test device for a step chain comprises a base, a driving mechanism for simulating the operation of the step chain and a loading mechanism for simulating the load of the step chain; the driving mechanism comprises a servo motor arranged on the base, a driving chain wheel coupled to the base in a shaft mode, and a driven chain wheel coupled to the base in a sliding mode; the driving chain wheel is in transmission connection with the servo motor; the driving chain wheel and the driven chain wheel are matched with each other on the same plane and used for installing the step chain to be tested and driving the step chain to run; the load mechanism comprises a hinge lever and a counterweight component, and the fulcrum of the hinge lever is hinged to the base; the power arm of the hinge lever is connected with the counterweight component, and the resistance arm of the hinge lever is connected with the driven sprocket, so that the vertical downward gravity borne by the counterweight component is converted into a tensile force along the sliding direction of the driven sprocket, and the driven sprocket is pulled towards the direction far away from the driving sprocket so as to simulate the load-bearing load of the step chain to be tested.
Through the scheme, the invention at least obtains the following technical effects:
the step chain to be tested is sleeved on a driving chain wheel and a driven chain wheel of the driving mechanism, and the servo motor drives the driving chain wheel to rotate, so that the step chain to be tested simulates the rotation state of the escalator in operation. The power arm of the hinge lever is connected with the counterweight component, the resistance arm of the hinge lever is connected with the driven chain wheel, and the fulcrum is hinged on the base; the counterweight assembly applies a downward gravitational force to the hinge lever at the power arm, and the resistance arm applies a pulling force to the driven sprocket through the conversion of the hinge lever. The driven chain wheel moves to the direction far away from the driving chain wheel along the sliding path under the prying action of the hinge lever, the driving chain wheel and the driven chain wheel are jointly meshed and supported by the step chain, and the step chain is tensioned and bears the load converted by the gravity of the counterweight component. The testing device keeps running for a long time, and the numerical value of the change of the time and the length of the step chain is measured and recorded at regular time until the step chain is broken, the breaking length of the step chain is the limit length of the step chain, and the time corresponding to the breaking is the limit service life of the step chain.
It is worth mentioning that the value of the load-bearing load when a passenger is fully loaded can be calculated according to the specification of the escalator adapted to the step chain to be measured. According to the scheme, the gravity value required to be provided by the counterweight component can be calculated through known parameters such as the numerical value of the load required to be loaded at the driven chain wheel, the ratio of the power arm to the resistance arm of the hinge lever and the like according to the lever principle.
When the step chain service life testing device is used for testing, the driving device which replaces the loss energy to do work through the gravity action of the counterweight component continuously applies load to the step chain, so that a large amount of energy is saved, and the cost is reduced.
Preferably, the base comprises a base, at least two support arms arranged on the base and a guide rod erected between the two support arms; the guide rod is parallel to the plane where the driving chain wheel and the driven chain wheel are located; a sliding block is arranged on the guide rod in a sliding manner; the driven chain wheel is rotatably arranged on the sliding block.
In order to avoid the existence of an included angle between the sliding direction of the driven chain wheel and the length direction of the step chain, the lateral stress abrasion of the step chain is also serious in the test process, the proportion of the abrasion caused by the lateral stress and the abrasion caused by the bearing stress can not be determined, and the serious interference can be generated on the test structure. The moving direction of the driven sprocket needs to be defined with high precision.
Set up the support body structure of two at least support arms effect this base on the base for installation drive sprocket and driven sprocket. A guide rod is erected between the two support arms and is parallel to the plane where the to-be-detected step chain is located, and the to-be-detected step chain is prevented from being distorted and receiving lateral force. And the driven chain wheel arranged on the sliding block can slide along the guide rod under the action of the counterweight component and the hinge lever.
Preferably, the guide rod is horizontally arranged; the hinge lever is a triangular force arm support, and three vertexes of the triangular force arm support are respectively used as a fulcrum, a power arm endpoint and a resistance arm endpoint; the supporting point is hinged on the supporting arm; the end point of the power arm is used for connecting the counterweight component; the end point of the resistance arm is connected with the sliding block through a connecting rod; one end of the connecting rod is hinged with the end point of the resistance arm, and the other end of the connecting rod is hinged with the sliding block.
If the guide rod is arranged obliquely, the driven chain wheel and the sliding block can slide along the guide rod under the action of gravity, so that additional load is applied to the step chain to be measured. Causing errors in the test. In order to eliminate the influence, the guide rod is horizontally arranged, so that the gravity direction is perpendicular to the guide rod, and the influence of the gravity action on the driven chain wheel and the slide block on the test is reduced to the minimum. The friction between the slider and the guide bar can be further reduced by increasing the smoothness of the contact surface between the slider and the guide bar to reduce friction. The friction in this test had a negligible effect on the test results.
The hinge lever is used for converting the vertical downward gravity action into the stretching action along the length direction of the guide rod so as to apply load to the step chain to be measured. Because the guide rod is horizontally arranged and is vertical to the gravity direction, the hinge lever adopts a triangular force arm frame structure. One point is hinged with the supporting arm as a fulcrum, and the other two points generate displacement along with the integral rotation of the triangular force arm support, so that the conversion effect is realized.
Because the triangular force arm frame is rotated, the displacement path of the endpoint of the resistance arm is a curve, and therefore the triangular force arm frame is connected with the sliding block through the connecting rod to form a crank sliding block structure, and the curve motion is converted into linear motion.
Preferably, the counterweight assembly comprises a counterweight box and a plurality of counterweights placed in the counterweight box; the gravity value of the counterweight component is adjusted by increasing or decreasing the number of the counterweight blocks placed in the counterweight box.
In order to improve the application range of the device, the device can be applied to the service life tests of the step chains with different models and sizes. It is desirable to enable the amount of gravity provided by the weight assembly to be adjustable. Therefore, the counterweight assembly adopts a mode of combining the counterweight box and a plurality of counterweights, and the gravity value provided by the counterweight assembly is changed by increasing or decreasing the number of the counterweights in the counterweight box.
Preferably, the counterweight assembly further comprises a pulley assembly and a steel wire rope; one end of the steel wire rope is connected with the weight box, and the other end of the steel wire rope is connected with the end point of the power arm; the pulley assembly comprises a pulley bracket fixedly arranged on the supporting arm; and the pulley bracket is provided with a guide pulley which is used for matching with the steel wire rope and turning the steel wire rope.
If the weight box is directly connected with the hinge lever, due to the fact that the weight of the weight box is heavy, shaking and vibration generated when the weight box is scraped by external force can be transmitted to the hinge lever and the step chain in the test, and the problems that the hinge lever structure is damaged or the step chain is twisted and abraded laterally exist. Therefore, the weight box is connected with the end point of the power arm through the steel wire rope, and the proportion that the shaking and vibration effects of the weight box are transmitted to the hinge lever is weakened through the steel wire rope. And then the steel wire rope is prolonged, and the guide pulley is used as a transition contact point, so that the proportion of the shaking and vibration effects of the weight box transferred to the hinge lever is reduced to the minimum.
Preferably, an oil receiving disc is arranged right below a rotating structure formed by combining the driving chain wheel and the driven chain wheel; and an oil sprayer for spraying lubricating oil on the step chain to be detected is arranged in the oil receiving disc.
Since the experimental device needs to be operated for a long time to simulate the working environment of the step chain actually installed in the escalator. Therefore, lubricating oil needs to be sprayed on the chain structure of the step chain frequently to simulate the daily maintenance state of the escalator. The abrasion degree of a pin shaft of the step chain is prevented from being increased due to oil shortage friction. In order to facilitate the spraying of the lubricating oil, the test time is shortened at the same time. An oil receiving disc is arranged right below a rotating structure whole formed by connecting the driving chain wheel and the driven chain wheel through a step chain to be tested, and the oil receiving disc is provided with an oil sprayer. The oil injector is filled with lubricating oil. After the oil injector is opened, lubricating oil can be sprayed on the rotating step chain. Connect the food tray to be used for collecting from the lubricating oil that the step chain fell down drips, avoid test device's base and peripheral be infected with the greasy dirt and be difficult to the clearance.
Preferably, the sliding block comprises a block body, a rotating shaft and a mounting disc; the rotating shaft is coupled to the block body, and the end part of the rotating shaft is fixedly connected with the center of the mounting disc; the driven chain wheel is detachably connected to the mounting disc in a threaded manner through a bolt; and/or
The sliding block is also provided with four through holes, and the four through holes are symmetrically distributed on two sides of the rotating shaft in a pairwise and grouped manner; the guide rods are four rod bodies which are parallel to each other and are arranged up and down in a group two by two; the four through holes are sleeved on the four rod bodies in a one-to-one correspondence manner.
Because the wheel structure of the through shaft rotating structure is adopted, the driven chain wheel can be replaced only by integrally hoisting out, and the installation precision of the driven chain wheel needs to be adjusted in a large amount of time before and after installation, which wastes time and labor. Therefore, the rotating shaft and the mounting disk are connected to the sliding block in a shaft mode to serve as a universal shaft and a universal mounting position, and only the driven chain wheel is replaced. Driven sprocket carries out convenient and fast's dismantlement through bolt and mounting disc and is connected, need not the countershaft and removes, has avoided recalibrating the step of installation accuracy, has greatly shortened the required operating procedure of change driven sprocket and time.
In order to avoid the influence on the test structure caused by the deflection of the driven chain wheel arranged on the sliding block and the distortion of the step chain due to the deflection and even deformation of the sliding block caused by overlarge stress in the process of pulling and moving the sliding block by tensile force. The guide rods and the through holes formed in the sliding block are arranged into four groups, and the guide rods and the through holes are symmetrically distributed on two sides of the rotating shaft in a pairwise and one group mode, so that the gravity center of the sliding block is stable when the sliding block slides along the four rod bodies of the guide rods.
Preferably, the end point of the power arm is provided with a fixed pulley; the steel wire rope forms a ring sleeve and is sleeved on the fixed pulley; the fixed pulley and the guide pulley are identical in structure, and grooves are formed in the circumferential surface of the wheel rim, so that the steel wire rope is embedded into the grooves.
In order to further weaken the effect of the steel wire rope on transferring the shaking and the vibration of the weight box, the steel wire rope and the end point of the power arm are connected in a matching mode of the fixed pulley and the rope sleeve, and the end part of the steel wire rope is wound on the axial wheel rim of the fixed pulley to form connection. The link structure can ensure that the end point stress direction of the power arm of the hinge lever is stable, and the hinge lever can still be stably matched with the steel wire rope after rotating along with the gradual elongation of the step chain to be detected.
Preferably, a distance measuring sensor is arranged on the supporting arm; for measuring the distance the slide is displaced in the pulled state of the loading mechanism.
In order to improve the precision of measuring the elongation value of the step chain, a distance measuring sensor is arranged on the supporting arm, and the distance between the sliding block and the supporting arm is measured in real time when the distance measuring sensor is in a normally open state. The displacement distance of the slide block can be obtained by calculating the difference value between the position of the slide block during measurement and the position of the slide block in an initial state, and the stretching length of the step chain is twice of the displacement distance of the slide block. The distance measuring sensor can adopt a laser distance measuring sensor.
Preferably, two sets of driving mechanism and loading mechanism are provided on the base.
When a passenger takes the escalator, the passenger often stands by right or left according to the habit of passing one side, so that the stress of the chains on two sides of the escalator is uneven in the working process, and the service life test needs to simulate the service life of the step chains on two sides of the escalator under the condition of uneven stress. Therefore, the step chain service life testing device is provided with two groups of driving mechanisms and loading mechanisms, and two step chains are tested simultaneously. And (4) carrying out service life test on the two step chains through the counterweight components with different gravity values, and comprehensively obtaining the service life interval of the two step chains of the same escalator.
Drawings
Fig. 1 is a schematic perspective view of a step chain life testing apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic side view of a step chain life testing apparatus according to an embodiment of the present invention.
Fig. 3 is a schematic perspective view of a driven sprocket and a slider according to an embodiment of the present invention.
FIG. 4 is a cross-sectional view of the driven sprocket and the slider according to an embodiment of the present invention.
Fig. 5 is a schematic perspective view of a fixed pulley according to an embodiment of the present invention.
FIG. 6 is a schematic view of an oil pan according to an embodiment of the present invention.
Fig. 7 is a schematic view of a weight box according to an embodiment of the present invention.
Fig. 8 is a schematic view of a mounting position of a distance measuring sensor according to an embodiment of the invention.
Legend:
1, a base; 2, a driving mechanism; 3, a load mechanism; 4, an oil receiving disc; 5 a distance measuring sensor;
11 a base; 12 supporting the arm; 13 a guide rod; 14, a slide block;
21 a servo motor; 22 a drive sprocket; 23 a driven sprocket;
31 a hinge lever; 32 a weight assembly;
41 fuel injector;
141 blocks; 142 a rotating shaft; 143 mounting the disc; 144 through holes;
311 connecting rods; 312 fulcrums; 313 power arm end point; 314 resistance arm end point; 315 a fixed pulley;
321 weight box; 322 weight block; 323 a steel wire rope; 324 a pulley bracket; 325 to the pulley.
Detailed Description
The invention is further illustrated by the following figures and examples.
Please refer to fig. 1-8.
A life test device for a step chain comprises a base 1, a driving mechanism 2 for simulating the operation of the step chain and a loading mechanism 3 for simulating the load of the step chain; the driving mechanism 2 comprises a servo motor 21 arranged on the base 1, a driving chain wheel 22 coupled to the base 1 in a shaft-coupling mode, and a driven chain wheel 23 coupled to the base 1 in a sliding mode; the driving chain wheel 22 is in transmission connection with the servo motor 21; the driving chain wheel 22 and the driven chain wheel 23 are matched with each other on the same plane and used for installing the step chain to be tested and driving the step chain to run; the load mechanism 3 comprises a hinge lever 31 and a counterweight component 32, the fulcrum 312 of which is hinged on the base 1; the power arm of the hinge lever 31 is connected with the counterweight component 32, and the resistance arm is connected with the driven sprocket 23, so that the vertical downward gravity borne by the counterweight component 32 is converted into a tensile force along the sliding direction of the driven sprocket 23, and the driven sprocket 23 is pulled towards the direction far away from the driving sprocket 22, so as to simulate the load of the step chain to be tested.
Through the scheme, the invention at least obtains the following technical effects:
the step chain to be tested is sleeved on a driving chain wheel 22 and a driven chain wheel 23 of the driving mechanism 2, and the servo motor 21 drives the driving chain wheel 22 to rotate, so that the step chain to be tested simulates the rotation state of the escalator in operation. The power arm of the hinge lever 31 is connected with the counterweight component 32, the resistance arm is connected with the driven chain wheel 23, and the fulcrum 312 is hinged on the base 1; the weight assembly 32 applies a downward gravitational force to the hinge lever 31 at the power arm, which, through translation of the hinge lever 31, causes the resistance arm to apply a pulling force to the driven sprocket 23. The driven sprocket 23 moves along its sliding path in a direction away from the driving sprocket 22 under the prying action of the hinge lever 31, tensioning the step chain supported by the driving sprocket 22 in engagement with the driven sprocket 23 and bearing the load converted by the weight of the counterweight assembly 32. The testing device keeps running for a long time, and the numerical value of the change of the time and the length of the step chain is measured and recorded at regular time until the step chain is broken, the breaking length of the step chain is the limit length of the step chain, and the time corresponding to the breaking is the limit service life of the step chain.
It is worth mentioning that the value of the load-bearing load when a passenger is fully loaded can be calculated according to the specification of the escalator adapted to the step chain to be measured. In the scheme, the gravity value required to be provided by the counterweight assembly 32 can be calculated according to the lever principle through known parameters such as the numerical value of the required heavy load at the driven chain wheel 23 and the ratio of the power arm to the resistance arm of the hinge lever 31.
When the step chain service life testing device is used for testing, the driving device which replaces the loss energy to do work through the gravity action of the counterweight component 32 continuously applies load to the step chain, so that a large amount of energy is saved, and the cost is reduced.
Based on the above scheme, there is the contained angle for the length direction of avoiding driven sprocket 23's slip direction and step chain, causes the step chain lateral force wearing and tearing equally serious among the test process, and the proportion of wearing and tearing that the wearing and tearing that can't confirm that lateral force caused and bearing atress caused can produce serious interference to the test structure. The moving direction of the driven sprocket 23 needs to be defined with high accuracy. In one embodiment, the base 1 comprises a base 11, at least two support arms 12 mounted on the base 11, and a guide rod 13 erected between the two support arms 12; the guide rod 13 is parallel to the plane where the driving chain wheel 22 and the driven chain wheel 23 are located; a sliding block 14 is arranged on the guide rod 13 in a sliding manner; the driven sprocket 23 is rotatably mounted to the slider 14.
At least two support arms 12 are arranged on the base 11 and used for supporting the frame body structure of the base 1, and the frame body structure is used for installing a driving chain wheel 22 and a driven chain wheel 23. A guide rod 13 is erected between the two support arms 12, and the guide rod 13 is parallel to the plane of the step chain to be detected to prevent the step chain to be detected from being distorted and receiving lateral force. And the driven sprocket 23 mounted on the slider 14 is allowed to slide along the guide bar 13 by the weight assembly 32 and the hinge lever 31.
Based on the above scheme, if the guide rod 13 is arranged obliquely, the driven sprocket 23 and the slide block 14 slide along the guide rod 13 under the action of gravity, so as to apply an additional load to the step chain to be measured. Causing errors in the test. To eliminate this effect, in one embodiment, the guide bar 13 is horizontally disposed; the guide rod 13 is horizontally arranged, so that the gravity direction is perpendicular to the guide rod 13, and the influence of gravity on the test of the driven chain wheel 23 and the slide block 14 is reduced to the minimum. The friction between the slider 14 and the guide bar 13 can be further reduced by increasing the smoothness of the contact surface between the two to reduce friction. The friction in this test had a negligible effect on the test results.
Based on the above scheme, the hinge lever 31 is used for converting the action of vertical downward gravity into a stretching action along the length direction of the guide rod 13 so as to apply a load to the step chain to be measured. Since the guide rod 13 is horizontally disposed and perpendicular to the gravity direction, in an embodiment, the hinge lever 31 is a triangular arm support, and three vertexes of the triangular arm support are respectively used as a fulcrum 312, a power arm endpoint 313 and a resistance arm endpoint 314; the fulcrum 312 is hinged on the support arm 12; power arm end point 313 is used to connect counterweight assembly 32; the resistance arm end point 314 is connected with the slider 14 through a connecting rod 311; one end of the connecting rod 311 is hinged with the end point 314 of the resistance arm, and the other end is hinged with the sliding block 14.
The hinge lever 31 adopts a triangular force arm frame structure. One point is hinged to the supporting arm 12 as a pivot 312, and the other two points generate displacement along with the integral rotation of the triangular force arm support, so that the conversion effect is realized.
Because the triangular moment arm frame is rotated, the displacement path of the endpoint 314 of the resistance arm is a curve, and therefore the triangular moment arm frame is connected with the slider 14 through the connecting rod 311 to form a crank slider 14 structure, and the curve motion is converted into linear motion.
Based on the scheme, the device can be applied to the service life tests of the step chains with different models and sizes in order to improve the application range of the device. It is desirable to enable the amount of gravity provided by the weight assembly 32 to be adjustable. Thus, in one embodiment, the weight assembly 32 includes a weight box 321 and a number of weights 322 placed within the weight box 321; the weight value of the weight assembly 32 is adjusted by increasing or decreasing the number of weights 322 placed in the weight box 321.
The weight component 32 adopts a mode of combining the weight box 321 and a plurality of balancing weights 322, and the gravity value provided by the weight component 32 is changed by increasing or decreasing the number of the balancing weights 322 in the weight box 321.
Based on the above scheme, if the weight box 321 is directly connected with the hinge lever 31, due to the large weight of the weight box 321, shaking and vibration generated when the weight box is scratched by an external force can be transmitted to the hinge lever 31 and the step chain in the test, and the problem that the structure of the hinge lever 31 is damaged or the step chain is twisted and abraded laterally exists. Thus, in one embodiment, the counterweight assembly 32 further includes a sheave assembly and a wire rope 323; one end of the steel wire rope 323 is connected with the weight box 321, and the other end of the steel wire rope 323 is connected with the power arm end point 313; the pulley assembly includes a pulley bracket 324 fixedly mounted to the support arm 12; the pulley bracket 324 is provided with a guide pulley 325 for matching with the steel wire rope 323 and turning the steel wire rope 323.
The weight box 321 is connected with the power arm end point 313 through a wire rope 323, and the proportion of the shaking and vibration effects of the weight box 321 transmitted to the hinge lever 31 is weakened through the wire rope 323. And then the proportion of the effect of shaking and vibration of the weight box 321 transmitted to the hinge lever 31 can be minimized by extending the wire rope 323 and by using the guide pulley 325 as a transition contact point.
It should be mentioned that, in this embodiment, in order to reduce the space occupied by the experimental apparatus, a door-shaped spanning structure is formed by the steel wire rope 323, the pulley assembly and the hinge lever 31, so that the length of the reserved scale inhibition of the steel wire rope 323 is ensured to reduce the transmission of the shaking and vibration effects, and the space is saved.
In addition, in order to avoid the overturn accident caused by the overweight of the counterweight assembly 32 of the test device, a counterweight is welded on the base 1 at the side opposite to the counterweight assembly 32 so as to maintain the overall balance of the test device.
Based on the scheme, the experimental device needs to run for a long time to simulate the working environment of the step chain actually installed in the escalator. Therefore, lubricating oil needs to be sprayed on the chain structure of the step chain frequently to simulate the daily maintenance state of the escalator. The abrasion degree of a pin shaft of the step chain is prevented from being increased due to oil shortage friction. In order to facilitate the spraying of the lubricating oil, the test time is shortened at the same time. In one embodiment, an oil receiving pan 4 is arranged right below a rotating structure formed by combining the driving sprocket 22 and the driven sprocket 23; and an oil injector 41 for spraying lubricating oil on the step chain to be detected is arranged in the oil receiving disc 4.
An oil receiving pan 4 is provided directly below the entire rotating structure formed by connecting the driving sprocket 22 and the driven sprocket 23 by a step chain to be measured, and an injector 41 is provided. The injector 41 is filled with lubricating oil. The injector 41 is opened to spray the lubricating oil on the rotating step chain. Connect food tray 4 to be used for collecting from the lubricating oil that the step chain is low to drop, avoid test device's base 1 and peripheral be infected with the greasy dirt and be difficult to the clearance.
Based on above-mentioned scheme, owing to adopt the wheel structure of through-shaft revolution mechanic, need whole to hang out just can carry out driven sprocket 23's change, and need its installation accuracy of a large amount of time adjustment before and after the installation, waste time and energy. Therefore, in one embodiment, the slider 14 includes a block 141, a rotating shaft 142, and a mounting plate 143; the rotating shaft 142 is coupled to the block 141, and an end of the rotating shaft is fixedly connected to the center of the mounting plate 143; the driven sprocket 23 is detachably screwed to the mounting plate 143 by bolts.
The rotating shaft 142 and the mounting plate 143 are coupled to the slider 14 as a common shaft and a common mounting position, and only the driven sprocket 23 is replaced. Driven sprocket 23 carries out convenient and fast's dismantlement through bolt and mounting disc 143 and is connected, need not to move countershaft 142, has avoided the step of recalibrating installation accuracy, has greatly shortened the required operation step of change driven sprocket 23 and time.
Based on the scheme, in order to avoid the influence on the test structure caused by the deflection and even deformation of the slide block 14 due to overlarge stress on the slide block 14 in the process of pulling and moving the slide block 14 by tensile force, the driven chain wheel 23 installed on the slide block 14 deflects, and the step chain is twisted. In an embodiment, the sliding block 14 is further provided with four through holes 144, and the four through holes 144 are symmetrically distributed on two sides of the rotating shaft 142 in pairs; the guide rods 13 are four rod bodies which are parallel to each other and are arranged up and down in pairs; the four through holes 144 are correspondingly sleeved on the four rod bodies one by one.
The guide rods 13 and the through holes 144 formed in the slide block 14 are arranged in four groups, and the groups are symmetrically distributed on two sides of the rotating shaft 142, so that the center of gravity of the slide block 14 is stable when the slide block slides along the four rod bodies of the guide rods 13.
Based on the above scheme, in order to further weaken the effect of the steel wire rope 323 transmitting shaking and vibration of the weight box 321, in an embodiment, the power arm end point 313 is provided with a fixed pulley 315; the steel wire rope 323 forms a ring sleeve and is sleeved on the fixed pulley 315; the fixed pulley 315 and the guide pulley 325 have the same structure, and grooves are formed in the circumferential surface of the rim, so that the steel wire rope 323 is embedded in the grooves.
The connection mode of the wire rope 323 and the power arm end point 313 adopts the matching mode of the fixed pulley 315 and a rope sleeve, and the end part of the wire rope 323 is wound on the axial rim of the fixed pulley 315 to form connection. The link structure can ensure that the force direction of the power arm end point 313 of the hinge lever 31 is stable, and the hinge lever 31 can still be stably matched with the steel wire rope 323 after rotating along with the gradual elongation of the step chain to be detected.
Based on the above scheme, in order to improve the precision of measuring the elongation value of the step chain, in an embodiment, the supporting arm 12 is provided with a distance measuring sensor 5; for measuring the distance the slide 14 is displaced in the pulled state of the loading mechanism 3.
The distance measuring sensor 5 is arranged on the supporting arm 12, and the distance between the sliding block 14 and the supporting arm 12 is measured in real time when the distance measuring sensor 5 is in a normally open state. The displacement distance of the slide 14 can be obtained by calculating the difference between the position of the slide 14 in the measurement and the position of the slide 14 in the initial state, and the stretching length of the step chain is twice of the displacement distance of the slide 14. The distance measuring sensor 5 may employ a laser distance measuring sensor 5.
Based on the scheme, when a passenger takes the escalator, the passenger often stands by right or left according to the habit of passing one side, so that the two side chains of the escalator are stressed unevenly in the working process, and the service life test needs to simulate the service life of the two side step chains under the condition of unbalanced stress. Thus, in one embodiment, two sets of drive means 2 and load means 3 are provided on the base 1.
The step chain service life testing device is provided with two groups of driving mechanisms 2 and a loading mechanism 3, and two step chains are tested simultaneously. And (4) carrying out service life test on the two step chains through the counterweight components 32 with different gravity values, and comprehensively obtaining the service life interval of the two step chains of the same escalator.
The present invention is not limited to the above-described embodiments, and various changes and modifications of the present invention are intended to be included within the scope of the claims and the equivalent technology of the present invention if they do not depart from the spirit and scope of the present invention.
Claims (10)
1. The utility model provides a step chain life test device which characterized in that: the device comprises a base, a driving mechanism for simulating the running of a step chain and a loading mechanism for simulating the load of the step chain; the driving mechanism comprises a servo motor arranged on the base, a driving chain wheel coupled to the base in a shaft mode, and a driven chain wheel coupled to the base in a sliding mode; the driving chain wheel is in transmission connection with the servo motor; the driving chain wheel and the driven chain wheel are matched with each other on the same plane and used for installing the step chain to be tested and driving the step chain to run; the load mechanism comprises a hinge lever and a counterweight component, and the fulcrum of the hinge lever is hinged to the base; the power arm of the hinge lever is connected with the counterweight component, and the resistance arm of the hinge lever is connected with the driven sprocket, so that the vertical downward gravity borne by the counterweight component is converted into a tensile force along the sliding direction of the driven sprocket, and the driven sprocket is pulled towards the direction far away from the driving sprocket so as to simulate the load-bearing load of the step chain to be tested.
2. The step chain life test device of claim 1, wherein the base comprises a base, at least two support arms mounted on the base, and a guide bar bridging between the two support arms; the guide rod is parallel to the plane where the driving chain wheel and the driven chain wheel are located; a sliding block is arranged on the guide rod in a sliding manner; the driven chain wheel is rotatably arranged on the sliding block.
3. The step chain life test device of claim 2, wherein the guide bar is horizontally disposed; the hinge lever is a triangular force arm support, and three vertexes of the triangular force arm support are respectively used as a fulcrum, a power arm endpoint and a resistance arm endpoint; the supporting point is hinged on the supporting arm; the end point of the power arm is used for connecting the counterweight component; the end point of the resistance arm is connected with the sliding block through a connecting rod; one end of the connecting rod is hinged with the end point of the resistance arm, and the other end of the connecting rod is hinged with the sliding block.
4. The step chain life test device of claim 3, wherein the weight assembly comprises a weight box and a plurality of weights disposed within the weight box; the gravity value of the counterweight component is adjusted by increasing or decreasing the number of the counterweight blocks placed in the counterweight box.
5. The step chain life test device of claim 4, wherein the counterweight assembly further comprises a pulley assembly and a wire rope; one end of the steel wire rope is connected with the weight box, and the other end of the steel wire rope is connected with the end point of the power arm; the pulley assembly comprises a pulley bracket fixedly arranged on the supporting arm; and the pulley bracket is provided with a guide pulley which is used for matching with the steel wire rope and turning the steel wire rope.
6. The step chain life test device of claim 2, wherein an oil receiving pan is arranged right below a rotating structure formed by combining the driving chain wheel and the driven chain wheel; and an oil sprayer for spraying lubricating oil on the step chain to be detected is arranged in the oil receiving disc.
7. The step chain life test device of claim 2, wherein the slide block comprises a block body, a rotating shaft and a mounting disc; the rotating shaft is coupled to the block body, and the end part of the rotating shaft is fixedly connected with the center of the mounting disc; the driven chain wheel is detachably connected to the mounting disc in a threaded manner through a bolt; and/or
The sliding block is also provided with four through holes, and the four through holes are symmetrically distributed on two sides of the rotating shaft in a pairwise and grouped manner; the guide rods are four rod bodies which are parallel to each other and are arranged up and down in a group two by two; the four through holes are sleeved on the four rod bodies in a one-to-one correspondence manner.
8. The step chain life test device of claim 5, wherein the power arm end point is provided with a fixed pulley; the steel wire rope forms a ring sleeve and is sleeved on the fixed pulley; the fixed pulley and the guide pulley are identical in structure, and grooves are formed in the circumferential surface of the wheel rim, so that the steel wire rope is embedded into the grooves.
9. The step chain life test device of claim 2, wherein a distance measuring sensor is arranged on the support arm; for measuring the distance the slide is displaced in the pulled state of the loading mechanism.
10. The step chain life test device of claim 1, wherein two sets of drive mechanisms and load mechanisms are provided on the base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010693314.XA CN111735712A (en) | 2020-07-17 | 2020-07-17 | Step chain life test device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010693314.XA CN111735712A (en) | 2020-07-17 | 2020-07-17 | Step chain life test device |
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| CN111735712A true CN111735712A (en) | 2020-10-02 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112254959A (en) * | 2020-12-02 | 2021-01-22 | 浙江神牛机械制造有限公司 | Chain wear resistance testing device and using method thereof |
| CN112475214A (en) * | 2020-11-09 | 2021-03-12 | 浙江浦江伯虎链条股份有限公司 | Lever cutting integrated machine |
-
2020
- 2020-07-17 CN CN202010693314.XA patent/CN111735712A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112475214A (en) * | 2020-11-09 | 2021-03-12 | 浙江浦江伯虎链条股份有限公司 | Lever cutting integrated machine |
| CN112254959A (en) * | 2020-12-02 | 2021-01-22 | 浙江神牛机械制造有限公司 | Chain wear resistance testing device and using method thereof |
| CN112254959B (en) * | 2020-12-02 | 2022-04-26 | 浙江神牛机械制造有限公司 | Chain wear resistance testing device and using method thereof |
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