CA3115559C - Device and method for testing load-carrying properties of wire rope for friction hoist - Google Patents
Device and method for testing load-carrying properties of wire rope for friction hoist Download PDFInfo
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- CA3115559C CA3115559C CA3115559A CA3115559A CA3115559C CA 3115559 C CA3115559 C CA 3115559C CA 3115559 A CA3115559 A CA 3115559A CA 3115559 A CA3115559 A CA 3115559A CA 3115559 C CA3115559 C CA 3115559C
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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
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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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
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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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
Abstract
A device and method for testing load-carrying properties of a wire rope for a friction hoist. The testing device comprises two loaded hydraulic cylinders (1), a hydraulic cylinder locating platform (2), a wire rope locating platform (6), a surrounding angle locating device (4) provided on a linear segment of the wire rope locating platform (6) in the vertical direction, and a plurality of wire rope locating devices (5) provided on an arc segment of the wire rope locating platform (6) in the radial direction. A practical friction hoisting process is simulated on the basis of the principle of driving a wire rope (3) and a two-way hydraulic pump (5-b) by the double-acting hydraulic cylinders (1) to provide load damping, the working conditions such as overload and secondary overload can be simulated for the loading of the hydraulic cylinders (1), and a creeping process of the wire rope (3) in a surrounding arc can be simulated for the providing of the load damping by the hydraulic pump (5-b), so that the load-carrying properties of the wire rope (3) can be accurately tested, and the test requirements of friction hoists having different drum diameters and different surrounding angles can be met.
Description
Description DEVICE AND METHOD FOR TESTING LOAD-CARRYING PROPERTIES OF WIRE ROPE
FOR FRICTION HOIST
Technical Field The present invention relates to a device and method for testing load-carrying properties of wire rope, in particular to a device and method for testing load-carrying properties of wire rope for friction hoist.
Background Art As the main mine hoisting equipment, vertical shaft hoists undertake important tasks of coal gangue hoisting, material lowering, and personnel and equipment lifting, and is the linking hub between the underground coal mine and the ground. Among vertical shaft hoists, friction hoists take a dominant position. The bearing capacity of the steel wire rope, which is the key component for load bearing and power transfer, has direct influence on the safety of mine hoisting.
According to the "Safety Regulations in Coal Mine", usually the hoisting steel wire rope shall be discarded and replaced once two years, but must be replaced immediately once the number of broken wires is increased suddenly or the elongation is accelerated suddenly. Before a new steel wire rope is installed, the new steel wire rope shall be verified, in order to avoid degradation of the bearing capacity of the hoist caused by the new steel wire rope, which may lead to a severe potential safety hazard. In addition, the vertical shaft hoister is key equipment that operates continuously in a long time in the coal mine, but the coal hoisting operation has to be stopped when the steel wire rope is to be replaced. Severe economic losses may be resulted if it is found that reparation is necessary after the rope is replaced. Therefore, it is necessary to carry out strict load-carrying property test on the new steel wire rope before the new steel wire rope can be installed.
Presently, the researches on steel wire rope tests mainly focus on the detection of defects of steel wire ropes in service in mines. For example, the novel non-destructive testing device for steel wire ropes disclosed in the Chinese Patent Application No. CN201710462492.X utilizes a magnetic flux leakage detection method to detect the defects of steel wire ropes. Besides, some researchers have set up various test stands to test a specific property of steel wire ropes. For example, the high-speed and fretting friction testing device for steel wire ropes disclosed in the Patent No. CN201410728384.9 can simulate the friction behavior between steel wire ropes and analyze the friction state of steel wire ropes under different sliding speed and fretting friction conditions. However, based on the above researches, it is unable to test the friction hoists of different specifications uniformly. Therefore, it is necessary to develop a testing device that can be used to uniformly test the load-carrying capacity of the steel wire ropes of friction hoists in vertical shafts with different drum diameters and drum wrap angles, so as to uniformly check different types of steel wire ropes produced by various manufacturers before field installation, avoid repeated testing investment for large-scale production enterprises, improve the manufacturing quality of small-scale production enterprises, set standard for the market of hoisting steel wire ropes, and ensure the load-carrying capacity of hoisting steel wire ropes.
Developing such a testing device is of great significance for ensuring the safety of vertical shaft hoisting. However, at present, such a testing device is unavailable.
Date Recue/Date Received 2022-06-09 Contents of the Invention Technical Problem: the object of the present invention is to overcome the drawbacks in the prior art, and the present invention provides a device and method for testing load-carrying properties of wire rope for friction hoist. The device has a simple structure, and is reliable and practical.
Technical Solution: a device for testing load-carrying properties of wire rope for friction hoist of the present invention, comprising loading hydraulic cylinders connected to a tested steel wire rope, a hydraulic cylinder positioning platform, a wrap angle positioning device, several steel wire rope positioning devices and a steel wire rope positioning platform, wherein the hydraulic cylinder positioning platform is arranged in the vertical direction and provided with several rows of hydraulic cylinder positioning holes arranged in parallel thereon; the steel wire rope positioning platform is in an arc shape, located in the same plane as the hydraulic cylinder positioning platform and is arranged opposite to the hydraulic cylinder positioning platform, and provided with several rows of positioning holes arranged circumferentially thereon; two loading hydraulic cylinders are provided and arranged side by side on the hydraulic cylinder positioning platform in the horizontal direction through the hydraulic cylinder positioning holes; the wrap angle positioning device is arranged on a linear section of the steel wire rope positioning platform in the vertical direction through the positioning holes; several steel wire rope positioning devices are arranged on an arc section of the steel wire rope positioning platform in the radial direction through the positioning holes.
The wrap angle positioning device comprises a positioning telescopic sleeve, a wrap angle positioning slide table, a wrap angle positioning lead screw, a wrap angle positioning lead screw nut, a positioning telescopic rod, wrap angle positioning rollers, a wrap angle positioning friction liners, a wrap angle positioning support table, a wrap angle positioning pedestal, and a wrap angle positioning hand wheel, wherein the wrap angle positioning support table is arranged on the wrap angle positioning pedestal;
the wrap angle positioning lead screw, the wrap angle positioning lead screw nut and the wrap angle positioning hand wheel are arranged coaxially; the wrap angle positioning hand wheel rotates to drive the wrap angle positioning lead screw to rotate, thereby pushing the wrap angle positioning lead screw nut to move back and forth; the wrap angle positioning slide table is fixed to the wrap angle positioning lead screw nut and can slide axially on the top surface of the wrap angle positioning support table; the positioning telescopic sleeve is arranged on the wrap angle positioning slide table axially; the wrap angle positioning roller is arranged on the top end of the positioning telescopic rod, and the rim of the wrap angle positioning roller is provided with a groove in which the wrap angle positioning friction liner is installed; the wrap angle positioning friction liner is provided with a rope groove.
The steel wire rope positioning device comprises a steel wire rope positioning support table, a two-way hydraulic pump, a steel wire rope positioning lead screw, a steel wire rope positioning pedestal, hydraulic pump positioning bolts, a main shaft of hydraulic pump, main steel wire rope positioning rollers, a main steel wire rope positioning slide table, steel wire rope positioning friction liners, steel wire rope clamping bolts, auxiliary steel wire rope positioning rollers, a auxiliary steel wire rope positioning slide table, a steel wire rope positioning lead screw nut, steel wire rope clamping nuts, and a steel wire rope positioning hand wheel, wherein the steel wire rope positioning support table is arranged on the steel wire rope positioning pedestal; the steel wire rope positioning lead screw, the steel wire rope positioning lead screw nut and the steel wire rope positioning hand wheel are arranged coaxially; the steel wire rope positioning hand wheel rotates to drive the steel wire rope positioning
FOR FRICTION HOIST
Technical Field The present invention relates to a device and method for testing load-carrying properties of wire rope, in particular to a device and method for testing load-carrying properties of wire rope for friction hoist.
Background Art As the main mine hoisting equipment, vertical shaft hoists undertake important tasks of coal gangue hoisting, material lowering, and personnel and equipment lifting, and is the linking hub between the underground coal mine and the ground. Among vertical shaft hoists, friction hoists take a dominant position. The bearing capacity of the steel wire rope, which is the key component for load bearing and power transfer, has direct influence on the safety of mine hoisting.
According to the "Safety Regulations in Coal Mine", usually the hoisting steel wire rope shall be discarded and replaced once two years, but must be replaced immediately once the number of broken wires is increased suddenly or the elongation is accelerated suddenly. Before a new steel wire rope is installed, the new steel wire rope shall be verified, in order to avoid degradation of the bearing capacity of the hoist caused by the new steel wire rope, which may lead to a severe potential safety hazard. In addition, the vertical shaft hoister is key equipment that operates continuously in a long time in the coal mine, but the coal hoisting operation has to be stopped when the steel wire rope is to be replaced. Severe economic losses may be resulted if it is found that reparation is necessary after the rope is replaced. Therefore, it is necessary to carry out strict load-carrying property test on the new steel wire rope before the new steel wire rope can be installed.
Presently, the researches on steel wire rope tests mainly focus on the detection of defects of steel wire ropes in service in mines. For example, the novel non-destructive testing device for steel wire ropes disclosed in the Chinese Patent Application No. CN201710462492.X utilizes a magnetic flux leakage detection method to detect the defects of steel wire ropes. Besides, some researchers have set up various test stands to test a specific property of steel wire ropes. For example, the high-speed and fretting friction testing device for steel wire ropes disclosed in the Patent No. CN201410728384.9 can simulate the friction behavior between steel wire ropes and analyze the friction state of steel wire ropes under different sliding speed and fretting friction conditions. However, based on the above researches, it is unable to test the friction hoists of different specifications uniformly. Therefore, it is necessary to develop a testing device that can be used to uniformly test the load-carrying capacity of the steel wire ropes of friction hoists in vertical shafts with different drum diameters and drum wrap angles, so as to uniformly check different types of steel wire ropes produced by various manufacturers before field installation, avoid repeated testing investment for large-scale production enterprises, improve the manufacturing quality of small-scale production enterprises, set standard for the market of hoisting steel wire ropes, and ensure the load-carrying capacity of hoisting steel wire ropes.
Developing such a testing device is of great significance for ensuring the safety of vertical shaft hoisting. However, at present, such a testing device is unavailable.
Date Recue/Date Received 2022-06-09 Contents of the Invention Technical Problem: the object of the present invention is to overcome the drawbacks in the prior art, and the present invention provides a device and method for testing load-carrying properties of wire rope for friction hoist. The device has a simple structure, and is reliable and practical.
Technical Solution: a device for testing load-carrying properties of wire rope for friction hoist of the present invention, comprising loading hydraulic cylinders connected to a tested steel wire rope, a hydraulic cylinder positioning platform, a wrap angle positioning device, several steel wire rope positioning devices and a steel wire rope positioning platform, wherein the hydraulic cylinder positioning platform is arranged in the vertical direction and provided with several rows of hydraulic cylinder positioning holes arranged in parallel thereon; the steel wire rope positioning platform is in an arc shape, located in the same plane as the hydraulic cylinder positioning platform and is arranged opposite to the hydraulic cylinder positioning platform, and provided with several rows of positioning holes arranged circumferentially thereon; two loading hydraulic cylinders are provided and arranged side by side on the hydraulic cylinder positioning platform in the horizontal direction through the hydraulic cylinder positioning holes; the wrap angle positioning device is arranged on a linear section of the steel wire rope positioning platform in the vertical direction through the positioning holes; several steel wire rope positioning devices are arranged on an arc section of the steel wire rope positioning platform in the radial direction through the positioning holes.
The wrap angle positioning device comprises a positioning telescopic sleeve, a wrap angle positioning slide table, a wrap angle positioning lead screw, a wrap angle positioning lead screw nut, a positioning telescopic rod, wrap angle positioning rollers, a wrap angle positioning friction liners, a wrap angle positioning support table, a wrap angle positioning pedestal, and a wrap angle positioning hand wheel, wherein the wrap angle positioning support table is arranged on the wrap angle positioning pedestal;
the wrap angle positioning lead screw, the wrap angle positioning lead screw nut and the wrap angle positioning hand wheel are arranged coaxially; the wrap angle positioning hand wheel rotates to drive the wrap angle positioning lead screw to rotate, thereby pushing the wrap angle positioning lead screw nut to move back and forth; the wrap angle positioning slide table is fixed to the wrap angle positioning lead screw nut and can slide axially on the top surface of the wrap angle positioning support table; the positioning telescopic sleeve is arranged on the wrap angle positioning slide table axially; the wrap angle positioning roller is arranged on the top end of the positioning telescopic rod, and the rim of the wrap angle positioning roller is provided with a groove in which the wrap angle positioning friction liner is installed; the wrap angle positioning friction liner is provided with a rope groove.
The steel wire rope positioning device comprises a steel wire rope positioning support table, a two-way hydraulic pump, a steel wire rope positioning lead screw, a steel wire rope positioning pedestal, hydraulic pump positioning bolts, a main shaft of hydraulic pump, main steel wire rope positioning rollers, a main steel wire rope positioning slide table, steel wire rope positioning friction liners, steel wire rope clamping bolts, auxiliary steel wire rope positioning rollers, a auxiliary steel wire rope positioning slide table, a steel wire rope positioning lead screw nut, steel wire rope clamping nuts, and a steel wire rope positioning hand wheel, wherein the steel wire rope positioning support table is arranged on the steel wire rope positioning pedestal; the steel wire rope positioning lead screw, the steel wire rope positioning lead screw nut and the steel wire rope positioning hand wheel are arranged coaxially; the steel wire rope positioning hand wheel rotates to drive the steel wire rope positioning
2 Date Recue/Date Received 2022-06-09 lead screw to rotate, thereby pushing the steel wire rope positioning lead screw nut to move back and forth; the main steel wire rope positioning slide table is fixed to the steel wire rope positioning lead screw nut, and can slide axially on the top surface of the steel wire rope positioning support table; the hydraulic pump positioning bolts fix the two-way hydraulic pump and the main steel wire rope positioning rollers coaxially on the main steel wire rope positioning slide table, and the main steel wire rope positioning rollers drive the main shaft of hydraulic pump to rotate synchronously; the auxiliary steel wire rope positioning slide table is arranged on the top surface of the steel wire rope positioning support table, the auxiliary steel wire rope positioning rollers are arranged on the auxiliary steel wire rope positioning slide table, and the axis of the main steel wire rope positioning rollers is in the same line as the axis of the auxiliary steel wire rope positioning rollers; the main steel wire rope positioning slide table and the auxiliary steel wire rope positioning slide table are provided with collinear through-holes in the two sides respectively, the steel wire rope clamping bolts penetrate through the through-holes from one end to connect the main steel wire rope positioning slide table and the auxiliary steel wire rope positioning slide table together, and are tightened up at the other end by means of the steel wire rope clamping nuts, so that the main steel wire rope positioning rollers and the auxiliary steel wire rope positioning rollers can clamp the tested steel wire rope under the action of squeezing force; the rims of the main steel wire rope positioning rollers and the rims of the auxiliary steel wire rope positioning rollers are provided with a groove respectively, in which the steel wire rope positioning friction liner is installed, and the steel wire rope positioning friction liner is provided with a rope groove.
The loading hydraulic cylinder is a double-acting hydraulic cylinder comprising a loading hydraulic cylinder jacket, a loading hydraulic cylinder pedestal, and a loading hydraulic cylinder piston rod; the front end of each loading hydraulic cylinder piston rod is provided with a steel wire rope lock sleeve, the two end pigtails of the tested steel wire rope connected with the loading hydraulic cylinders are clamped in the steel wire rope lock sleeves via installing steel wire rope locks, and pulling force is exerted on the tested steel wire rope via the loading hydraulic cylinders; the two loading hydraulic cylinders serve as a driving side and a load side for each other, the hydraulic cylinder at the driving side drives its loading hydraulic cylinder piston rod by adjusting the oil pressure at the oil inlet to pull the tested steel wire rope, while the hydraulic cylinder at the load side inhibit the tested steel wire rope from pulling its loading hydraulic cylinder piston rod by adjusting the oil pressure at the oil outlet.
The length of the loading hydraulic cylinder piston rod is greater than the circumference of the friction hoist with maximum diameter.
The number of the steel wire rope positioning devices depends on the testing accuracy of the friction hoist with different diameter.
The hole density of the hydraulic cylinder positioning holes in the vertical direction depends on the testing requirement for adaptation of the vertical distance clamped by the two loading hydraulic cylinders to the friction hoist with different diameter.
The hole density of the positioning holes in the circumferential direction depends on the testing requirement for adaptation of the arc enclosed by the wrap angle positioning device and the steel wire rope positioning devices to the friction hoist with different diameter and wrap angle.
A testing method by using the above-mentioned device for testing load-carrying properties of wire rope for friction hoist, comprising the following steps:
The loading hydraulic cylinder is a double-acting hydraulic cylinder comprising a loading hydraulic cylinder jacket, a loading hydraulic cylinder pedestal, and a loading hydraulic cylinder piston rod; the front end of each loading hydraulic cylinder piston rod is provided with a steel wire rope lock sleeve, the two end pigtails of the tested steel wire rope connected with the loading hydraulic cylinders are clamped in the steel wire rope lock sleeves via installing steel wire rope locks, and pulling force is exerted on the tested steel wire rope via the loading hydraulic cylinders; the two loading hydraulic cylinders serve as a driving side and a load side for each other, the hydraulic cylinder at the driving side drives its loading hydraulic cylinder piston rod by adjusting the oil pressure at the oil inlet to pull the tested steel wire rope, while the hydraulic cylinder at the load side inhibit the tested steel wire rope from pulling its loading hydraulic cylinder piston rod by adjusting the oil pressure at the oil outlet.
The length of the loading hydraulic cylinder piston rod is greater than the circumference of the friction hoist with maximum diameter.
The number of the steel wire rope positioning devices depends on the testing accuracy of the friction hoist with different diameter.
The hole density of the hydraulic cylinder positioning holes in the vertical direction depends on the testing requirement for adaptation of the vertical distance clamped by the two loading hydraulic cylinders to the friction hoist with different diameter.
The hole density of the positioning holes in the circumferential direction depends on the testing requirement for adaptation of the arc enclosed by the wrap angle positioning device and the steel wire rope positioning devices to the friction hoist with different diameter and wrap angle.
A testing method by using the above-mentioned device for testing load-carrying properties of wire rope for friction hoist, comprising the following steps:
3 Date Recue/Date Received 2022-06-09 (a) installing the wrap angle positioning support table on the wrap angle positioning pedestal, installing the wrap angle positioning lead screw, the wrap angle positioning lead screw nut and the wrap angle positioning hand wheel coaxially, fixing the wrap angle positioning slide table to the wrap angle positioning lead screw nut, installing the positioning telescopic sleeve axially on the wrap angle positioning slide table, installing the wrap angle positioning friction liners in the groove of the wrap angle positioning roller, and installing the wrap angle positioning roller on the top end of the positioning telescopic rod, to assemble a wrap angle positioning device;
(b) installing the steel wire rope positioning support table on the steel wire rope positioning pedestal, installing the steel wire rope positioning lead screw, the steel wire rope positioning lead screw nut and the steel wire rope positioning hand wheel coaxially, fixing the main steel wire rope positioning slide table to the steel wire rope positioning lead screw nut, installing the steel wire rope positioning friction liners in the grooves of the main steel wire rope positioning rollers and the auxiliary steel wire rope positioning rollers, fixing the two-way hydraulic pump and the main steel wire rope positioning rollers coaxially on the main steel wire rope positioning slide table with the hydraulic pump positioning bolts, inserting the steel wire rope clamping bolts from one end of the slide table though the through-holes to connect the main steel wire rope positioning slide table and the auxiliary steel wire rope positioning slide table together, and tightening the steel wire rope clamping bolts with the steel wire rope clamping nuts at the other end of the slide table, to assemble several steel wire rope positioning devices;
(c) based on the diameter D and wrap angle a of the friction hoist to which the tested steel wire rope belongs, installing the wrap angle positioning device in the vertical direction on the linear section of the steel wire rope positioning platform according to the positioning holes at preset positions, installing several steel wire rope positioning devices at an interval in the radial direction on the arc section of the steel wire rope positioning platform, turning the steel wire rope positioning hand wheel to push the steel wire rope positioning lead screw nut to move back and forth, turning the wrap angle positioning hand wheel to push the wrap angle positioning lead screw nut to move back and forth, trimming the telescopic length of the positioning telescopic rod to push the wrap angle positioning rollers to move back and forth in a small field, till the diameter of the arc enclosed by the rims of the wrap angle positioning rollers and the rims of the main steel wire rope positioning rollers is equal to the diameter D of the friction hoist and the angle of the arc is equal to the wrap angle a of the friction hoist finally, then arranging the two loading hydraulic cylinders side by side in the horizontal direction on the hydraulic cylinder positioning platform via the hydraulic cylinder positioning holes, with the vertical distance between the two hydraulic cylinders expressed as follows:
D
Dl= ¨(1+ cos (a ¨ 70) (d) cutting the tested steel wire rope in required length according to the telescopic length of the loading hydraulic cylinder piston rod and the diameter D of the friction hoist, installing the steel wire rope locks on the two end pigtails of the tested steel wire rope, clamping the steel wire rope locks in the steel wire rope lock sleeves, and embedding the arc part of the tested steel wire rope in the rope grooves of the wrap angle positioning friction liners and the steel wire rope positioning friction liners;
(e) adjusting the oil pressure at the oil inlet of the hydraulic cylinder at the driving side and the oil
(b) installing the steel wire rope positioning support table on the steel wire rope positioning pedestal, installing the steel wire rope positioning lead screw, the steel wire rope positioning lead screw nut and the steel wire rope positioning hand wheel coaxially, fixing the main steel wire rope positioning slide table to the steel wire rope positioning lead screw nut, installing the steel wire rope positioning friction liners in the grooves of the main steel wire rope positioning rollers and the auxiliary steel wire rope positioning rollers, fixing the two-way hydraulic pump and the main steel wire rope positioning rollers coaxially on the main steel wire rope positioning slide table with the hydraulic pump positioning bolts, inserting the steel wire rope clamping bolts from one end of the slide table though the through-holes to connect the main steel wire rope positioning slide table and the auxiliary steel wire rope positioning slide table together, and tightening the steel wire rope clamping bolts with the steel wire rope clamping nuts at the other end of the slide table, to assemble several steel wire rope positioning devices;
(c) based on the diameter D and wrap angle a of the friction hoist to which the tested steel wire rope belongs, installing the wrap angle positioning device in the vertical direction on the linear section of the steel wire rope positioning platform according to the positioning holes at preset positions, installing several steel wire rope positioning devices at an interval in the radial direction on the arc section of the steel wire rope positioning platform, turning the steel wire rope positioning hand wheel to push the steel wire rope positioning lead screw nut to move back and forth, turning the wrap angle positioning hand wheel to push the wrap angle positioning lead screw nut to move back and forth, trimming the telescopic length of the positioning telescopic rod to push the wrap angle positioning rollers to move back and forth in a small field, till the diameter of the arc enclosed by the rims of the wrap angle positioning rollers and the rims of the main steel wire rope positioning rollers is equal to the diameter D of the friction hoist and the angle of the arc is equal to the wrap angle a of the friction hoist finally, then arranging the two loading hydraulic cylinders side by side in the horizontal direction on the hydraulic cylinder positioning platform via the hydraulic cylinder positioning holes, with the vertical distance between the two hydraulic cylinders expressed as follows:
D
Dl= ¨(1+ cos (a ¨ 70) (d) cutting the tested steel wire rope in required length according to the telescopic length of the loading hydraulic cylinder piston rod and the diameter D of the friction hoist, installing the steel wire rope locks on the two end pigtails of the tested steel wire rope, clamping the steel wire rope locks in the steel wire rope lock sleeves, and embedding the arc part of the tested steel wire rope in the rope grooves of the wrap angle positioning friction liners and the steel wire rope positioning friction liners;
(e) adjusting the oil pressure at the oil inlet of the hydraulic cylinder at the driving side and the oil
4 Date Recue/Date Received 2022-06-09 pressure at the oil outlet of the hydraulic cylinder at the load side, and actuating the loading hydraulic cylinders at low oil pressure, so that the tested steel wire rope is tensioned up;
tightening up the steel wire rope clamping nuts so that the steel wire rope positioning friction liners clamp the steel wire rope tightly to avoid any relative slip between the steel wire rope positioning friction liners and the tested steel wire rope;
(f) simulating a load FL] at the heavy load side and a load FL2 at the no-load side during actual friction hoisting according to the diameter D and wrap angle a of the friction hoist, and obtaining tangential force distributionfe on the tested steel wire rope (3) within the range of the wrap angle a with the following formula:
{ 2Ft 2e' I! h9 _ ' 0 5 0 5 aR
f60 - BD , 0 an5095a wherein, 0 is the circumferential coordinate with the separation point of the steel wire rope at the driving side and the friction wheel as the origin and the counterclockwise direction as the positive direction, B is the width of the actual friction liner of the hoist, y is the friction ln(FL, I F,2) coefficient of the actual friction liner, 12K¨ is the creeping arc angle within the Al wrap arc under the action of FL] and FL2;
thus, obtaining the tangential forces fl, f2, f3, f4, fs, f6 and f7 on the tested steel wire rope at the main steel wire rope positioning rollers, adjusting the oil pressure at the oil discharge outlet of the two-way hydraulic pump accordingly, and adding additional rotation damping to the main steel wire rope positioning rollers according to the following formula:
k= _______________________________ fi+f2+f3+4+f5+4+fy , mi=kfir,M2 = kf2r,M3 = kf3r,M4 = kf4r,M 5 = kf5r,M6 =k-f6r,M7 =kf7r wherein, M1,M2,M3,M4,M5,M6,M7 are the simulated load torque at each two-way hydraulic pump (5-b), k is a compensation coefficient, and r is the radius of the main steel wire rope positioning roller (5-g), when the loading hydraulic cylinders pull the tested steel wire rope, FLI¨kfi+kf2+kf3+kfi+kfs-hkf6+kf7+F.L2; thus, simulating the actual steel wire rope pulling process of the friction hoist and the creeping process of the steel wire rope within the wrap arc in the friction hoisting process;
to test the tensile strength of the tested steel wire rope, the oil pressures of the loading hydraulic cylinders and the two-way hydraulic pump may be adjusted, so that the hydraulic cylinder at the driving side and the hydraulic cylinder at the load side pull the tested steel wire rope, so as to simulate the actual overload and secondary loading conditions of the friction hoist; at that point, whether the tested steel wire rope meets the requirement for tensile strength can be judged by detecting whether the unit elongation of the steel wire rope is within an allowable threshold;
Date Recue/Date Received 2022-06-09 to test the fatigue life of the tested steel wire rope, the oil pressures of the loading hydraulic cylinders and the two-way hydraulic pump may be adjusted, so that the hydraulic cylinder at the driving side and the hydraulic cylinder at the load side pull the tested steel wire rope alternately and cyclically, so as to simulate the actual coal hoisting process of the friction hoist; at that point, whether the tested steel wire rope meets the requirement for fatigue life can be judged by detecting whether the percentage of broken wires and unit elongation of the steel wire rope in multiple cycles are within allowable thresholds; in addition, since there is no time limitation on the actual coal loafing and unloading process, the testing process can be accelerated greatly by adjusting the flow rates through the loading hydraulic cylinders and the two-way hydraulic pump.
Beneficial effects: the device for testing the load-carrying capacity of the steel wire rope for a friction hoist provided by the present invention can be used to uniformly test the load-carrying capacity of steel wire ropes for friction hoists in vertical shafts with different drum diameters and drum wrap angles, and uniformly check different types of steel wire ropes produced by various manufacturers before field installation, thereby avoides repeated test investment for large-scale production enterprises and improves the manufacturing quality of small-scale production enterprises, and sets standard for the market of hoisting steel wire ropes and ensures the load-carrying capacity of hoisting steel wire ropes. In the present invention, the actual friction hoisting process is simulated on the basis of a principle that the double-acting hydraulic cylinders drive the steel wire rope and the two-way hydraulic pump provides load damping, and steel wire rope positioning device and the wrap angle positioning device that are based on lead screw transmission are employed, so that the present invention is applicable to steel wire ropes of friction hoists with different drum diameters and different wrap angles. Harsh working conditions such as overload and secondary loading, etc. can be simulated by utilizing hydraulic cylinder loading, so as to test the tensile strength of the steel wire rope under extremity working conditions; the actual tangential force distribution of the steel wire rope along the drum can be simulated by utilizing the hydraulic pump to provide load damping, thereby the creeping process of the steel wire rope within the wrap arc can be simulated, so as to accurately test the fatigue life of the steel wire rope and accurately test the load-carrying capacity of the steel wire rope. The device provided by the present invention can meet the requirements for testing friction hoists with different drum diameters and different wrap angles, has a simple structure, high reliability, and high versatility, and is of great significance for ensuring the load-carrying capacity of hoisting steel wire ropes and ensuring safe friction hoisting.
Description of Drawings Fig. 1 is a schematic structural diagram of the device provided in the present invention;
Fig. 2 is a schematic structural diagram of the wrap angle positioning device in the present invention;
Fig. 3 is a schematic structural diagram of the steel wire rope positioning and loading device in the present invention;
Fig. 4 is a schematic installation diagram of the loading hydraulic cylinders and steel wire rope in the present invention;
Fig. 5 is a schematic diagram illustrating the testing principle of the device in the present invention.
In the figures: 1 - loading hydraulic cylinder, 1-a - loading hydraulic cylinder jacket, 1-b - loading hydraulic cylinder pedestal, 1-c - loading hydraulic cylinder piston rod, 1-d -steel wire rope lock sleeve, 2 - hydraulic cylinder positioning platform, 2-a - hydraulic cylinder positioning hole, 3 - steel Date Recue/Date Received 2022-06-09 wire rope, 3-a - steel wire rope lock, 4 - wrap angle positioning device, 4-a -positioning telescopic sleeve, 4-b - wrap angle positioning slide table, 4-c - wrap angle positioning lead screw, 4-d - wrap angle positioning lead screw nut, 4-e - positioning telescopic rod, 4-f - wrap angle positioning roller, 4-g - wrap angle positioning friction liner, 4-h - wrap angle positioning support table, 4-i - wrap angle positioning pedestal, 4-j - wrap angle positioning hand wheel, 5 - steel wire rope positioning device,
tightening up the steel wire rope clamping nuts so that the steel wire rope positioning friction liners clamp the steel wire rope tightly to avoid any relative slip between the steel wire rope positioning friction liners and the tested steel wire rope;
(f) simulating a load FL] at the heavy load side and a load FL2 at the no-load side during actual friction hoisting according to the diameter D and wrap angle a of the friction hoist, and obtaining tangential force distributionfe on the tested steel wire rope (3) within the range of the wrap angle a with the following formula:
{ 2Ft 2e' I! h9 _ ' 0 5 0 5 aR
f60 - BD , 0 an5095a wherein, 0 is the circumferential coordinate with the separation point of the steel wire rope at the driving side and the friction wheel as the origin and the counterclockwise direction as the positive direction, B is the width of the actual friction liner of the hoist, y is the friction ln(FL, I F,2) coefficient of the actual friction liner, 12K¨ is the creeping arc angle within the Al wrap arc under the action of FL] and FL2;
thus, obtaining the tangential forces fl, f2, f3, f4, fs, f6 and f7 on the tested steel wire rope at the main steel wire rope positioning rollers, adjusting the oil pressure at the oil discharge outlet of the two-way hydraulic pump accordingly, and adding additional rotation damping to the main steel wire rope positioning rollers according to the following formula:
k= _______________________________ fi+f2+f3+4+f5+4+fy , mi=kfir,M2 = kf2r,M3 = kf3r,M4 = kf4r,M 5 = kf5r,M6 =k-f6r,M7 =kf7r wherein, M1,M2,M3,M4,M5,M6,M7 are the simulated load torque at each two-way hydraulic pump (5-b), k is a compensation coefficient, and r is the radius of the main steel wire rope positioning roller (5-g), when the loading hydraulic cylinders pull the tested steel wire rope, FLI¨kfi+kf2+kf3+kfi+kfs-hkf6+kf7+F.L2; thus, simulating the actual steel wire rope pulling process of the friction hoist and the creeping process of the steel wire rope within the wrap arc in the friction hoisting process;
to test the tensile strength of the tested steel wire rope, the oil pressures of the loading hydraulic cylinders and the two-way hydraulic pump may be adjusted, so that the hydraulic cylinder at the driving side and the hydraulic cylinder at the load side pull the tested steel wire rope, so as to simulate the actual overload and secondary loading conditions of the friction hoist; at that point, whether the tested steel wire rope meets the requirement for tensile strength can be judged by detecting whether the unit elongation of the steel wire rope is within an allowable threshold;
Date Recue/Date Received 2022-06-09 to test the fatigue life of the tested steel wire rope, the oil pressures of the loading hydraulic cylinders and the two-way hydraulic pump may be adjusted, so that the hydraulic cylinder at the driving side and the hydraulic cylinder at the load side pull the tested steel wire rope alternately and cyclically, so as to simulate the actual coal hoisting process of the friction hoist; at that point, whether the tested steel wire rope meets the requirement for fatigue life can be judged by detecting whether the percentage of broken wires and unit elongation of the steel wire rope in multiple cycles are within allowable thresholds; in addition, since there is no time limitation on the actual coal loafing and unloading process, the testing process can be accelerated greatly by adjusting the flow rates through the loading hydraulic cylinders and the two-way hydraulic pump.
Beneficial effects: the device for testing the load-carrying capacity of the steel wire rope for a friction hoist provided by the present invention can be used to uniformly test the load-carrying capacity of steel wire ropes for friction hoists in vertical shafts with different drum diameters and drum wrap angles, and uniformly check different types of steel wire ropes produced by various manufacturers before field installation, thereby avoides repeated test investment for large-scale production enterprises and improves the manufacturing quality of small-scale production enterprises, and sets standard for the market of hoisting steel wire ropes and ensures the load-carrying capacity of hoisting steel wire ropes. In the present invention, the actual friction hoisting process is simulated on the basis of a principle that the double-acting hydraulic cylinders drive the steel wire rope and the two-way hydraulic pump provides load damping, and steel wire rope positioning device and the wrap angle positioning device that are based on lead screw transmission are employed, so that the present invention is applicable to steel wire ropes of friction hoists with different drum diameters and different wrap angles. Harsh working conditions such as overload and secondary loading, etc. can be simulated by utilizing hydraulic cylinder loading, so as to test the tensile strength of the steel wire rope under extremity working conditions; the actual tangential force distribution of the steel wire rope along the drum can be simulated by utilizing the hydraulic pump to provide load damping, thereby the creeping process of the steel wire rope within the wrap arc can be simulated, so as to accurately test the fatigue life of the steel wire rope and accurately test the load-carrying capacity of the steel wire rope. The device provided by the present invention can meet the requirements for testing friction hoists with different drum diameters and different wrap angles, has a simple structure, high reliability, and high versatility, and is of great significance for ensuring the load-carrying capacity of hoisting steel wire ropes and ensuring safe friction hoisting.
Description of Drawings Fig. 1 is a schematic structural diagram of the device provided in the present invention;
Fig. 2 is a schematic structural diagram of the wrap angle positioning device in the present invention;
Fig. 3 is a schematic structural diagram of the steel wire rope positioning and loading device in the present invention;
Fig. 4 is a schematic installation diagram of the loading hydraulic cylinders and steel wire rope in the present invention;
Fig. 5 is a schematic diagram illustrating the testing principle of the device in the present invention.
In the figures: 1 - loading hydraulic cylinder, 1-a - loading hydraulic cylinder jacket, 1-b - loading hydraulic cylinder pedestal, 1-c - loading hydraulic cylinder piston rod, 1-d -steel wire rope lock sleeve, 2 - hydraulic cylinder positioning platform, 2-a - hydraulic cylinder positioning hole, 3 - steel Date Recue/Date Received 2022-06-09 wire rope, 3-a - steel wire rope lock, 4 - wrap angle positioning device, 4-a -positioning telescopic sleeve, 4-b - wrap angle positioning slide table, 4-c - wrap angle positioning lead screw, 4-d - wrap angle positioning lead screw nut, 4-e - positioning telescopic rod, 4-f - wrap angle positioning roller, 4-g - wrap angle positioning friction liner, 4-h - wrap angle positioning support table, 4-i - wrap angle positioning pedestal, 4-j - wrap angle positioning hand wheel, 5 - steel wire rope positioning device,
5-a - steel wire rope positioning support table, 5-b - two-way hydraulic pump, 5-c - steel wire rope positioning lead screw, 5-d - steel wire rope positioning pedestal, 5-e -hydraulic pump positioning bolt, 5-f- main shaft of the hydraulic pump, 5-g - main steel wire rope positioning roller, 5-h - main steel wire rope positioning slide table, 5-i - steel wire rope positioning friction liner, 5-j - steel wire rope clamping bolt, 5-k - auxiliary steel wire rope positioning roller, 5-1 -auxiliary steel wire rope positioning slide table, 5-m - steel wire rope positioning lead screw nut, 5-n - steel wire rope clamping nut, 5-o - steel wire rope positioning hand wheel, 6 - steel wire rope positioning platform, 6-a -positioning hole.
Embodiments Hereunder the present invention will be further detailed in embodiments with reference to the accompanying drawings.
As shown in Fig. 1, a device for testing load-carrying properties of steel wire rope for friction hoist according to the present invention mainly comprises two loading hydraulic cylinders 1, a hydraulic cylinder positioning platform 2, a wrap angle positioning device 4, several steel wire rope positioning devices 5 and a steel wire rope positioning platform 6, wherein the hydraulic cylinder positioning platform 2 is arranged in the vertical direction, located in the same plane as the steel wire rope positioning platform 6 and is arranged opposite to the steel wire rope positioning platform 6, and provided with several rows of hydraulic cylinder positioning holes 2-a arranged in parallel thereon;
the steel wire rope positioning platform 6 is provided with several rows of positioning holes 6-a arranged circumferentially thereon; the two loading hydraulic cylinders 1 are arranged side by side in the horizontal direction on the hydraulic cylinder positioning platform 2 via the hydraulic cylinder positioning holes 2-a; the wrap angle positioning device 4 is arranged on a linear section of the steel wire rope positioning platform 6 in the vertical direction through the positioning holes 6-a; the several steel wire rope positioning devices 5 are arranged on an arc section of the steel wire rope positioning platform 6 in the radial direction through the positioning holes 6-a.
As shown in Fig. 2, the wrap angle positioning device 4 comprises a positioning telescopic sleeve 4-a, a wrap angle positioning slide table 4-b, a wrap angle positioning lead screw 4-c, a wrap angle positioning lead screw nut 4-d, a positioning telescopic rod 4-e, wrap angle positioning rollers 4-f, a wrap angle positioning friction liners 4-g, a wrap angle positioning support table 4-h, a wrap angle positioning pedestal 4-i, and a wrap angle positioning hand wheel 4-j, wherein the wrap angle positioning support table 4-h is arranged on the wrap angle positioning pedestal 4-i; the wrap angle positioning lead screw 4-c, the wrap angle positioning lead screw nut 4-d and the wrap angle positioning hand wheel 4-j are arranged coaxially; the wrap angle positioning hand wheel 4-j rotates to drive the wrap angle positioning lead screw 4-c to rotate, thereby pushing the wrap angle positioning lead screw nut 4-d to move back and forth; the wrap angle positioning slide table 4-b is fixed to the wrap angle positioning lead screw nut 4-d and can slide axially on the top surface of the wrap angle positioning support table 4-h; the positioning telescopic sleeve 4-a is arranged on the wrap angle positioning slide table 4-b axially; the wrap angle positioning roller 4-f is arranged on the top end of the positioning telescopic rod 4-e, and the rim of the wrap angle positioning roller 4-f is Date Recue/Date Received 2022-06-09 provided with a groove in which the wrap angle positioning friction liner 4-g is installed; the wrap angle positioning friction liner 4-g is provided with a rope groove.
As shown in Fig. 3, the steel wire rope positioning device 5 comprises a steel wire rope positioning support table 5-a, a two-way hydraulic pump 5-b, a steel wire rope positioning lead screw 5-c, a steel wire rope positioning pedestal 5-d, hydraulic pump positioning bolts 5-e, a main shaft 5-f of the hydraulic pump , main steel wire rope positioning rollers 5-g, a main steel wire rope positioning slide table 5-h, steel wire rope positioning friction liners 5-i, steel wire rope clamping bolts 5-j, secondary steel wire rope positioning rollers 5-k, a secondary steel wire rope positioning slide table 5-1, a steel wire rope positioning lead screw nut 5-m, steel wire rope clamping nuts 5-n, and a steel wire rope positioning hand wheel 5-o, wherein the steel wire rope positioning support table 5-a is arranged on the steel wire rope positioning pedestal 5-d; the steel wire rope positioning lead screw 5-c, the steel wire rope positioning lead screw nut 5-m and the steel wire rope positioning hand wheel 5-o are arranged coaxially; the steel wire rope positioning hand wheel 5-o rotates to drive the steel wire rope positioning lead screw 5-c to rotate, thereby pushing the steel wire rope positioning lead screw nut 5-m to move back and forth; the main steel wire rope positioning slide table 5-h is fixed to the steel wire rope positioning lead screw nut 5-m, and can slide axially on the top surface of the steel wire rope positioning support table 5-a; the hydraulic pump positioning bolts 5-e fix the two-way hydraulic pump 5-b and the main steel wire rope positioning rollers 5-g coaxially on the main steel wire rope positioning slide table 5-h, and the main steel wire rope positioning rollers 5-g drive the main shaft 5-f of the hydraulic pump to rotate synchronously; the auxiliary steel wire rope positioning slide table 5-1 is arranged on the top surface of the steel wire rope positioning support table 5-a, the auxiliary steel wire rope positioning rollers 5-k are arranged on the auxiliary steel wire rope positioning slide table 5-1, and the axis of the main steel wire rope positioning rollers 5-g is in the same line as the axis of the auxiliary steel wire rope positioning rollers 5-k; the main steel wire rope positioning slide table 5-h and the auxiliary steel wire rope positioning slide table 5-1 are provided with collinear through-holes in the two sides respectively, the steel wire rope clamping bolts 5-j penetrate through the through-holes from one end to connect the main steel wire rope positioning slide table 5-h and the auxiliary steel wire rope positioning slide table 5-1 together, and are tightened up at the other end by means of the steel wire rope clamping nuts 5-n, so that the main steel wire rope positioning rollers 5-g and the auxiliary steel wire rope positioning rollers 5-k can clamp the tested steel wire rope 3 under the action of certain squeezing force; the rims of the main steel wire rope positioning rollers 5-g and the rims of the auxiliary steel wire rope positioning rollers 5-k are provided with a groove respectively, in which the steel wire rope positioning friction liner 5-i is installed, and the steel wire rope positioning friction liner 5-i is provided with a rope groove.
As shown in Fig. 4, the loading hydraulic cylinder 1 is a double-acting hydraulic cylinder comprising a loading hydraulic cylinder jacket 1-a, a loading hydraulic cylinder pedestal 1-b, and a loading hydraulic cylinder piston rod 1-c, and a steel wire rope lock sleeve 1-d; the front end of each loading hydraulic cylinder piston rod 1-c is provided with a steel wire rope lock sleeve 1-d, the steel wire rope locks 3-a are clamped in the steel wire rope lock sleeves 1-d after steel wire rope locks 3-a are installed on the two end pigtails of the steel wire rope 3, thus pulling force can be exerted on the tested steel wire rope 3 via the loading hydraulic cylinders 1; the two loading hydraulic cylinders 1 serve as a driving side and a load side for each other, the hydraulic cylinder at the driving side drives its loading hydraulic cylinder piston rod 1-c by adjusting the oil pressure at the oil inlet to pull the tested steel wire rope 3, while the hydraulic cylinder at the load side inhibit the tested steel wire rope 3 from pulling its loading hydraulic cylinder piston rod 1-c by adjusting the oil pressure at the oil outlet.
Date Recue/Date Received 2022-06-09 The length of the loading hydraulic cylinder piston rod 1-c shall be greater than the circumference of the friction hoist with maximum diameter; the number of the steel wire rope positioning devices 5 depends on the testing accuracy of the friction hoist with different diameter;
the hole density of the hydraulic cylinder positioning holes 2-a in the vertical direction meets the testing requirement for adaptation of the vertical distance clamped by the two loading hydraulic cylinders 1 to the friction hoist with different diameter; the hole density of the positioning holes 6-a in the circumferential direction meets the testing requirement for adaptation of the arc enclosed by the wrap angle positioning device 4 and several steel wire rope positioning devices 5 to the friction hoist with different diameter and wrap angle.
As shown in Fig. 5, the method for testing the load-carrying capacity of the steel wire rope for a friction hoist in the present invention comprises the following specific steps:
(a) installing the wrap angle positioning support table 4-h on the wrap angle positioning pedestal 4-i, installing the wrap angle positioning lead screw 4-c, the wrap angle positioning lead screw nut 4-d and the wrap angle positioning hand wheel 4-j coaxially, fixing the wrap angle positioning slide table 4-b to the wrap angle positioning lead screw nut 4-d, installing the positioning telescopic sleeve 4-a axially on the wrap angle positioning slide table 4-b, installing the wrap angle positioning friction liners 4-g in the groove of the wrap angle positioning roller 4-f, and installing the wrap angle positioning roller 4-f on the top end of the positioning telescopic rod 4-e, to assemble a wrap angle positioning device 4;
(b) installing the steel wire rope positioning support table 5-a on the steel wire rope positioning pedestal 5-d, installing the steel wire rope positioning lead screw 5-c, the steel wire rope positioning lead screw nut 5-m and the steel wire rope positioning hand wheel 5-o coaxially, fixing the main steel wire rope positioning slide table 5-h to the steel wire rope positioning lead screw nut 5-m, installing the steel wire rope positioning friction liners 5-i in the grooves of the main steel wire rope positioning rollers 5-g and the auxiliary steel wire rope positioning rollers 5-k, fixing the two-way hydraulic pump 5-b and the main steel wire rope positioning rollers 5-g coaxially on the main steel wire rope positioning slide table 5-h with the hydraulic pump positioning bolts 5-e, inserting the steel wire rope clamping bolts 5-j from one end of the slide table though the through-holes to connect the main steel wire rope positioning slide table 5-h and the auxiliary steel wire rope positioning slide table 5-1 together, and tightening the steel wire rope clamping bolts 5-j with the steel wire rope clamping nuts 5-n at the other end of the slide table, to assemble several steel wire rope positioning devices 5;
(c) based on the diameter D and wrap angle a of the friction hoist to which the tested steel wire rope belongs, installing the wrap angle positioning device 4 in the vertical direction on the linear section of the steel wire rope positioning platform 6 according to the positioning holes 6-a at selected positions, installing several steel wire rope positioning devices 5 at an interval in the radial direction on the arc section of the steel wire rope positioning platform 6, turning the steel wire rope positioning hand wheel 5-o to push the steel wire rope positioning lead screw nut 5-m to move back and forth, turning the wrap angle positioning hand wheel 4-j to push the wrap angle positioning lead screw nut 4-d to move back and forth, trimming the telescopic length of the positioning telescopic rod 4-e to push the wrap angle positioning rollers 4-f to move back and forth in a small field, till the diameter of the arc enclosed by the rims of the wrap angle positioning rollers 4-f and the rims of the main steel wire rope positioning rollers 5-g is equal to the diameter D of the friction hoist and the angle of the arc is equal to the wrap angle a of the Date Recue/Date Received 2022-06-09 friction hoist finally, then arranging the two loading hydraulic cylinders 1 side by side in the horizontal direction on the hydraulic cylinder positioning platform 2 via the hydraulic cylinder positioning holes 2-a, with the vertical distance between the two hydraulic cylinders expressed as follows:
, D1¨ ¨D(1+ cos(a ¨ 70) (d) cutting the tested steel wire rope 3 in appropriate length according to the telescopic length of the loading hydraulic cylinder piston rod 1-c and the diameter D of the friction hoist, installing the steel wire rope locks 3-a on the two end pigtails of the tested steel wire rope 3, clamping the steel wire rope locks 3-a in the steel wire rope lock sleeves 1-d, and embedding the arc part of the tested steel wire rope 3 in the rope grooves of the wrap angle positioning friction liners 4-g and the steel wire rope positioning friction liners 5-i;
(e) adjusting the oil pressure at the oil inlet of the hydraulic cylinder at the driving side and the oil pressure at the oil outlet of the hydraulic cylinder at the load side, and actuating the loading hydraulic cylinders 1 at low oil pressure, so that the tested steel wire rope 3 is tensioned up;
tightening up the steel wire rope clamping nuts 5-n so that the steel wire rope positioning friction liners 5-i clamp the steel wire rope 3 tightly to avoid any relative slip between the steel wire rope positioning friction liners 5-i and the tested steel wire rope 3;
(f) simulating a load FL] at the heavy load side and a load FL2 at the no-load side during actual friction hoisting according to the diameter D and wrap angle a of the friction hoist, and obtaining tangential force distribution on the tested steel wire rope 3 within the range of the wrap angle a with the following formula:
2F e' 1.2 1-1 (.195ceR
fe = 4 BD , 0 ceR a wherein, 0 is the circumferential coordinate with the separation point of the steel wire rope at the driving side and the friction wheel as the origin and the counterclockwise direction as the positive direction, B is the width of the actual friction liner of the hoist, it is the friction coefficient of the In(Fri I Fiz) actual friction liner, a R ¨ is the creeping arc angle within the wrap arc under the It action of FL] and FL2; thus, obtaining the tangential forces fi, f2, f3, f I, fs, f6 and f7 on the tested steel wire rope 3 at the main steel wire rope positioning rollers 5-g, adjusting the oil pressure at the oil discharge outlet of the two-way hydraulic pump 5-b accordingly, and adding additional rotation damping to the main steel wire rope positioning rollers 5-g according to the following formula:
n .1.2 fl-Ff2+fl+f4+A-i-f6+f, m1= kfir,M 2 = k12r,M 3 = 1cf3r,M 4 = k14r,M 5 = kf5r,M 6 = kf6r ,M 7 = kl,r' {
Date Recue/Date Received 2022-06-09 wherein, MI, M2,M3,M4,M5,M6,M7 are the simulated load torque at each two-way hydraulic pump (5-b), k is a compensation coefficient, and r is the radius of the main steel wire rope positioning roller 5-g, when the loading hydraulic cylinders 1 pull the tested steel wire rope 3, FL/ ¨Iffi +kf2+kf3+kf4+kfs+kf6+kf7+F.L2; thus, simulating the actual steel wire rope pulling process of the friction hoist and the creeping process of the steel wire rope within the wrap arc in the friction hoisting process;
(g) adjusting the oil pressures of the loading hydraulic cylinders 1 and the two-way hydraulic pump 5-b:
to test the tensile strength of the steel wire rope 3, the hydraulic cylinder at the driving side and the hydraulic cylinder at the load side pull the tested steel wire rope 3, so as to simulate the actual overload and secondary loading conditions of the friction hoist; at that point, whether the tested steel wire rope 3 meets the requirement for tensile strength can be judged by detecting whether the unit elongation of the steel wire rope 3 is within an allowable threshold;
to test the fatigue life of the steel wire rope 3, the hydraulic cylinder at the driving side and the hydraulic cylinder at the load side pull the tested steel wire rope 3 alternately and cyclically, so as to simulate the actual coal hoisting process of the friction hoist; at that point, whether the tested steel wire rope 3 meets the requirement for fatigue life can be judged by detecting whether the percentage of broken wires and unit elongation of the steel wire rope 3 in a certain number of cycles are within allowable thresholds; in addition, since there is no time limitation on the actual coal loading and unloading process, the testing process can be accelerated greatly by adjusting the flow rates through the loading hydraulic cylinders 1 and the two-way hydraulic pump 5-b.
Date Recue/Date Received 2022-06-09
Embodiments Hereunder the present invention will be further detailed in embodiments with reference to the accompanying drawings.
As shown in Fig. 1, a device for testing load-carrying properties of steel wire rope for friction hoist according to the present invention mainly comprises two loading hydraulic cylinders 1, a hydraulic cylinder positioning platform 2, a wrap angle positioning device 4, several steel wire rope positioning devices 5 and a steel wire rope positioning platform 6, wherein the hydraulic cylinder positioning platform 2 is arranged in the vertical direction, located in the same plane as the steel wire rope positioning platform 6 and is arranged opposite to the steel wire rope positioning platform 6, and provided with several rows of hydraulic cylinder positioning holes 2-a arranged in parallel thereon;
the steel wire rope positioning platform 6 is provided with several rows of positioning holes 6-a arranged circumferentially thereon; the two loading hydraulic cylinders 1 are arranged side by side in the horizontal direction on the hydraulic cylinder positioning platform 2 via the hydraulic cylinder positioning holes 2-a; the wrap angle positioning device 4 is arranged on a linear section of the steel wire rope positioning platform 6 in the vertical direction through the positioning holes 6-a; the several steel wire rope positioning devices 5 are arranged on an arc section of the steel wire rope positioning platform 6 in the radial direction through the positioning holes 6-a.
As shown in Fig. 2, the wrap angle positioning device 4 comprises a positioning telescopic sleeve 4-a, a wrap angle positioning slide table 4-b, a wrap angle positioning lead screw 4-c, a wrap angle positioning lead screw nut 4-d, a positioning telescopic rod 4-e, wrap angle positioning rollers 4-f, a wrap angle positioning friction liners 4-g, a wrap angle positioning support table 4-h, a wrap angle positioning pedestal 4-i, and a wrap angle positioning hand wheel 4-j, wherein the wrap angle positioning support table 4-h is arranged on the wrap angle positioning pedestal 4-i; the wrap angle positioning lead screw 4-c, the wrap angle positioning lead screw nut 4-d and the wrap angle positioning hand wheel 4-j are arranged coaxially; the wrap angle positioning hand wheel 4-j rotates to drive the wrap angle positioning lead screw 4-c to rotate, thereby pushing the wrap angle positioning lead screw nut 4-d to move back and forth; the wrap angle positioning slide table 4-b is fixed to the wrap angle positioning lead screw nut 4-d and can slide axially on the top surface of the wrap angle positioning support table 4-h; the positioning telescopic sleeve 4-a is arranged on the wrap angle positioning slide table 4-b axially; the wrap angle positioning roller 4-f is arranged on the top end of the positioning telescopic rod 4-e, and the rim of the wrap angle positioning roller 4-f is Date Recue/Date Received 2022-06-09 provided with a groove in which the wrap angle positioning friction liner 4-g is installed; the wrap angle positioning friction liner 4-g is provided with a rope groove.
As shown in Fig. 3, the steel wire rope positioning device 5 comprises a steel wire rope positioning support table 5-a, a two-way hydraulic pump 5-b, a steel wire rope positioning lead screw 5-c, a steel wire rope positioning pedestal 5-d, hydraulic pump positioning bolts 5-e, a main shaft 5-f of the hydraulic pump , main steel wire rope positioning rollers 5-g, a main steel wire rope positioning slide table 5-h, steel wire rope positioning friction liners 5-i, steel wire rope clamping bolts 5-j, secondary steel wire rope positioning rollers 5-k, a secondary steel wire rope positioning slide table 5-1, a steel wire rope positioning lead screw nut 5-m, steel wire rope clamping nuts 5-n, and a steel wire rope positioning hand wheel 5-o, wherein the steel wire rope positioning support table 5-a is arranged on the steel wire rope positioning pedestal 5-d; the steel wire rope positioning lead screw 5-c, the steel wire rope positioning lead screw nut 5-m and the steel wire rope positioning hand wheel 5-o are arranged coaxially; the steel wire rope positioning hand wheel 5-o rotates to drive the steel wire rope positioning lead screw 5-c to rotate, thereby pushing the steel wire rope positioning lead screw nut 5-m to move back and forth; the main steel wire rope positioning slide table 5-h is fixed to the steel wire rope positioning lead screw nut 5-m, and can slide axially on the top surface of the steel wire rope positioning support table 5-a; the hydraulic pump positioning bolts 5-e fix the two-way hydraulic pump 5-b and the main steel wire rope positioning rollers 5-g coaxially on the main steel wire rope positioning slide table 5-h, and the main steel wire rope positioning rollers 5-g drive the main shaft 5-f of the hydraulic pump to rotate synchronously; the auxiliary steel wire rope positioning slide table 5-1 is arranged on the top surface of the steel wire rope positioning support table 5-a, the auxiliary steel wire rope positioning rollers 5-k are arranged on the auxiliary steel wire rope positioning slide table 5-1, and the axis of the main steel wire rope positioning rollers 5-g is in the same line as the axis of the auxiliary steel wire rope positioning rollers 5-k; the main steel wire rope positioning slide table 5-h and the auxiliary steel wire rope positioning slide table 5-1 are provided with collinear through-holes in the two sides respectively, the steel wire rope clamping bolts 5-j penetrate through the through-holes from one end to connect the main steel wire rope positioning slide table 5-h and the auxiliary steel wire rope positioning slide table 5-1 together, and are tightened up at the other end by means of the steel wire rope clamping nuts 5-n, so that the main steel wire rope positioning rollers 5-g and the auxiliary steel wire rope positioning rollers 5-k can clamp the tested steel wire rope 3 under the action of certain squeezing force; the rims of the main steel wire rope positioning rollers 5-g and the rims of the auxiliary steel wire rope positioning rollers 5-k are provided with a groove respectively, in which the steel wire rope positioning friction liner 5-i is installed, and the steel wire rope positioning friction liner 5-i is provided with a rope groove.
As shown in Fig. 4, the loading hydraulic cylinder 1 is a double-acting hydraulic cylinder comprising a loading hydraulic cylinder jacket 1-a, a loading hydraulic cylinder pedestal 1-b, and a loading hydraulic cylinder piston rod 1-c, and a steel wire rope lock sleeve 1-d; the front end of each loading hydraulic cylinder piston rod 1-c is provided with a steel wire rope lock sleeve 1-d, the steel wire rope locks 3-a are clamped in the steel wire rope lock sleeves 1-d after steel wire rope locks 3-a are installed on the two end pigtails of the steel wire rope 3, thus pulling force can be exerted on the tested steel wire rope 3 via the loading hydraulic cylinders 1; the two loading hydraulic cylinders 1 serve as a driving side and a load side for each other, the hydraulic cylinder at the driving side drives its loading hydraulic cylinder piston rod 1-c by adjusting the oil pressure at the oil inlet to pull the tested steel wire rope 3, while the hydraulic cylinder at the load side inhibit the tested steel wire rope 3 from pulling its loading hydraulic cylinder piston rod 1-c by adjusting the oil pressure at the oil outlet.
Date Recue/Date Received 2022-06-09 The length of the loading hydraulic cylinder piston rod 1-c shall be greater than the circumference of the friction hoist with maximum diameter; the number of the steel wire rope positioning devices 5 depends on the testing accuracy of the friction hoist with different diameter;
the hole density of the hydraulic cylinder positioning holes 2-a in the vertical direction meets the testing requirement for adaptation of the vertical distance clamped by the two loading hydraulic cylinders 1 to the friction hoist with different diameter; the hole density of the positioning holes 6-a in the circumferential direction meets the testing requirement for adaptation of the arc enclosed by the wrap angle positioning device 4 and several steel wire rope positioning devices 5 to the friction hoist with different diameter and wrap angle.
As shown in Fig. 5, the method for testing the load-carrying capacity of the steel wire rope for a friction hoist in the present invention comprises the following specific steps:
(a) installing the wrap angle positioning support table 4-h on the wrap angle positioning pedestal 4-i, installing the wrap angle positioning lead screw 4-c, the wrap angle positioning lead screw nut 4-d and the wrap angle positioning hand wheel 4-j coaxially, fixing the wrap angle positioning slide table 4-b to the wrap angle positioning lead screw nut 4-d, installing the positioning telescopic sleeve 4-a axially on the wrap angle positioning slide table 4-b, installing the wrap angle positioning friction liners 4-g in the groove of the wrap angle positioning roller 4-f, and installing the wrap angle positioning roller 4-f on the top end of the positioning telescopic rod 4-e, to assemble a wrap angle positioning device 4;
(b) installing the steel wire rope positioning support table 5-a on the steel wire rope positioning pedestal 5-d, installing the steel wire rope positioning lead screw 5-c, the steel wire rope positioning lead screw nut 5-m and the steel wire rope positioning hand wheel 5-o coaxially, fixing the main steel wire rope positioning slide table 5-h to the steel wire rope positioning lead screw nut 5-m, installing the steel wire rope positioning friction liners 5-i in the grooves of the main steel wire rope positioning rollers 5-g and the auxiliary steel wire rope positioning rollers 5-k, fixing the two-way hydraulic pump 5-b and the main steel wire rope positioning rollers 5-g coaxially on the main steel wire rope positioning slide table 5-h with the hydraulic pump positioning bolts 5-e, inserting the steel wire rope clamping bolts 5-j from one end of the slide table though the through-holes to connect the main steel wire rope positioning slide table 5-h and the auxiliary steel wire rope positioning slide table 5-1 together, and tightening the steel wire rope clamping bolts 5-j with the steel wire rope clamping nuts 5-n at the other end of the slide table, to assemble several steel wire rope positioning devices 5;
(c) based on the diameter D and wrap angle a of the friction hoist to which the tested steel wire rope belongs, installing the wrap angle positioning device 4 in the vertical direction on the linear section of the steel wire rope positioning platform 6 according to the positioning holes 6-a at selected positions, installing several steel wire rope positioning devices 5 at an interval in the radial direction on the arc section of the steel wire rope positioning platform 6, turning the steel wire rope positioning hand wheel 5-o to push the steel wire rope positioning lead screw nut 5-m to move back and forth, turning the wrap angle positioning hand wheel 4-j to push the wrap angle positioning lead screw nut 4-d to move back and forth, trimming the telescopic length of the positioning telescopic rod 4-e to push the wrap angle positioning rollers 4-f to move back and forth in a small field, till the diameter of the arc enclosed by the rims of the wrap angle positioning rollers 4-f and the rims of the main steel wire rope positioning rollers 5-g is equal to the diameter D of the friction hoist and the angle of the arc is equal to the wrap angle a of the Date Recue/Date Received 2022-06-09 friction hoist finally, then arranging the two loading hydraulic cylinders 1 side by side in the horizontal direction on the hydraulic cylinder positioning platform 2 via the hydraulic cylinder positioning holes 2-a, with the vertical distance between the two hydraulic cylinders expressed as follows:
, D1¨ ¨D(1+ cos(a ¨ 70) (d) cutting the tested steel wire rope 3 in appropriate length according to the telescopic length of the loading hydraulic cylinder piston rod 1-c and the diameter D of the friction hoist, installing the steel wire rope locks 3-a on the two end pigtails of the tested steel wire rope 3, clamping the steel wire rope locks 3-a in the steel wire rope lock sleeves 1-d, and embedding the arc part of the tested steel wire rope 3 in the rope grooves of the wrap angle positioning friction liners 4-g and the steel wire rope positioning friction liners 5-i;
(e) adjusting the oil pressure at the oil inlet of the hydraulic cylinder at the driving side and the oil pressure at the oil outlet of the hydraulic cylinder at the load side, and actuating the loading hydraulic cylinders 1 at low oil pressure, so that the tested steel wire rope 3 is tensioned up;
tightening up the steel wire rope clamping nuts 5-n so that the steel wire rope positioning friction liners 5-i clamp the steel wire rope 3 tightly to avoid any relative slip between the steel wire rope positioning friction liners 5-i and the tested steel wire rope 3;
(f) simulating a load FL] at the heavy load side and a load FL2 at the no-load side during actual friction hoisting according to the diameter D and wrap angle a of the friction hoist, and obtaining tangential force distribution on the tested steel wire rope 3 within the range of the wrap angle a with the following formula:
2F e' 1.2 1-1 (.195ceR
fe = 4 BD , 0 ceR a wherein, 0 is the circumferential coordinate with the separation point of the steel wire rope at the driving side and the friction wheel as the origin and the counterclockwise direction as the positive direction, B is the width of the actual friction liner of the hoist, it is the friction coefficient of the In(Fri I Fiz) actual friction liner, a R ¨ is the creeping arc angle within the wrap arc under the It action of FL] and FL2; thus, obtaining the tangential forces fi, f2, f3, f I, fs, f6 and f7 on the tested steel wire rope 3 at the main steel wire rope positioning rollers 5-g, adjusting the oil pressure at the oil discharge outlet of the two-way hydraulic pump 5-b accordingly, and adding additional rotation damping to the main steel wire rope positioning rollers 5-g according to the following formula:
n .1.2 fl-Ff2+fl+f4+A-i-f6+f, m1= kfir,M 2 = k12r,M 3 = 1cf3r,M 4 = k14r,M 5 = kf5r,M 6 = kf6r ,M 7 = kl,r' {
Date Recue/Date Received 2022-06-09 wherein, MI, M2,M3,M4,M5,M6,M7 are the simulated load torque at each two-way hydraulic pump (5-b), k is a compensation coefficient, and r is the radius of the main steel wire rope positioning roller 5-g, when the loading hydraulic cylinders 1 pull the tested steel wire rope 3, FL/ ¨Iffi +kf2+kf3+kf4+kfs+kf6+kf7+F.L2; thus, simulating the actual steel wire rope pulling process of the friction hoist and the creeping process of the steel wire rope within the wrap arc in the friction hoisting process;
(g) adjusting the oil pressures of the loading hydraulic cylinders 1 and the two-way hydraulic pump 5-b:
to test the tensile strength of the steel wire rope 3, the hydraulic cylinder at the driving side and the hydraulic cylinder at the load side pull the tested steel wire rope 3, so as to simulate the actual overload and secondary loading conditions of the friction hoist; at that point, whether the tested steel wire rope 3 meets the requirement for tensile strength can be judged by detecting whether the unit elongation of the steel wire rope 3 is within an allowable threshold;
to test the fatigue life of the steel wire rope 3, the hydraulic cylinder at the driving side and the hydraulic cylinder at the load side pull the tested steel wire rope 3 alternately and cyclically, so as to simulate the actual coal hoisting process of the friction hoist; at that point, whether the tested steel wire rope 3 meets the requirement for fatigue life can be judged by detecting whether the percentage of broken wires and unit elongation of the steel wire rope 3 in a certain number of cycles are within allowable thresholds; in addition, since there is no time limitation on the actual coal loading and unloading process, the testing process can be accelerated greatly by adjusting the flow rates through the loading hydraulic cylinders 1 and the two-way hydraulic pump 5-b.
Date Recue/Date Received 2022-06-09
Claims (4)
1. A device for testing load-carrying properties of steel wire rope for friction hoist, comprising loading hydraulic cylinders (1) connected to a tested steel wire rope (3) and a hydraulic cylinder positioning platform (2), characterized in that: the device further comprises a wrap angle positioning device (4), several steel wire rope positioning devices (5) and a steel wire rope positioning platform (6), wherein the hydraulic cylinder positioning platform (2) is arranged in the vertical direction and provided with several rows of hydraulic cylinder positioning holes (2-a) arranged in parallel thereon; the steel wire rope positioning platform (6) is in an arc shape, located in the same plane as the hydraulic cylinder positioning platform (2) and is arranged opposite to the hydraulic cylinder positioning platform (2), and provided with several rows of positioning holes (6-a) arranged circumferentially thereon; two loading hydraulic cylinders (1) are provided and arranged side by side on the hydraulic cylinder positioning platform (2) in the horizontal direction through the hydraulic cylinder positioning holes (2-a);
the wrap angle positioning device (4) is arranged on a linear section of the steel wire rope positioning platform (6) in the vertical direction through the positioning holes (6-a); the steel wire rope positioning devices (5) are arranged on an arc section of the steel wire rope positioning platform (6) in the radial direction through the positioning holes (6-a).
the wrap angle positioning device (4) is arranged on a linear section of the steel wire rope positioning platform (6) in the vertical direction through the positioning holes (6-a); the steel wire rope positioning devices (5) are arranged on an arc section of the steel wire rope positioning platform (6) in the radial direction through the positioning holes (6-a).
2. The device for testing load-carrying properties of steel wire rope for friction hoist according to claim 1, wherein the wrap angle positioning device (4) comprises a positioning telescopic sleeve (4-a), a wrap angle positioning slide table (4-b), a wrap angle positioning lead screw (4-c), a wrap angle positioning lead screw nut (4-d), a positioning telescopic rod (4-e), wrap angle positioning rollers (4-f), a wrap angle positioning friction liners (4-g), a wrap angle positioning support table (4-h), a wrap angle positioning pedestal (4-i), and a wrap angle positioning hand wheel (4-j), wherein the wrap angle positioning support table (4-h) is arranged on the wrap angle positioning pedestal (4-i); the wrap angle positioning lead screw (4-c), the wrap angle positioning lead screw nut (4-d) and the wrap angle positioning hand wheel (4-j) are arranged coaxially; the wrap angle positioning hand wheel (4-j) rotates to drive the wrap angle positioning lead screw (4-c) to rotate, thereby pushing the wrap angle positioning lead screw nut (4-d) to move back and forth; the wrap angle positioning slide table (4-b) is fixed to the wrap angle positioning lead screw nut (4-d) and can slide axially on the top surface of the wrap angle positioning support table (4-h); the positioning telescopic sleeve (4-a) is arranged on the wrap angle positioning slide table (4-b) axially; the wrap angle positioning roller (4-f) is arranged on the top end of the positioning telescopic rod (4-e), and the rim of the wrap angle positioning roller (4-f) is provided with a groove in which the wrap angle positioning friction liner (4-g) is installed; the wrap angle positioning friction liner (4-g) is provided with a rope groove.
3. The device for testing load-carrying properties of steel wire rope for friction hoist according to claim 1, wherein each of the steel wire rope positioning devices (5) comprises a steel wire rope positioning support table (5-a), a two-way hydraulic pump (5-b), a steel wire rope positioning lead screw (5-c), a steel wire rope positioning pedestal (5-d), hydraulic pump positioning bolts (5-e), a main shaft (5-f) of the hydraulic pump, main steel wire rope positioning rollers (5-g), a main steel wire rope positioning slide table (5-h), steel wire rope positioning friction liners (5-Date Recue/Date Received 2022-06-09 i), steel wire rope clamping bolts (5-j), auxiliary steel wire rope positioning rollers (5-k), an auxiliary steel wire rope positioning slide table (5-1), a steel wire rope positioning lead screw nut (5-m), steel wire rope clamping nuts (5-n), and a steel wire rope positioning hand wheel (5-o), wherein the steel wire rope positioning support table (5-a) is arranged on the steel wire rope positioning pedestal (5-d); the steel wire rope positioning lead screw (5-c), the steel wire rope positioning lead screw nut (5-m) and the steel wire rope positioning hand wheel (5-o) are arranged coaxially; the steel wire rope positioning hand wheel (5-o) rotates to drive the steel wire rope positioning lead screw (5-c) to rotate, thereby pushing the steel wire rope positioning lead screw nut (5-m) to move back and forth; the main steel wire rope positioning slide table (5-h) is fixed to the steel wire rope positioning lead screw nut (5-m), and can slide axially on the top surface of the steel wire rope positioning support table (5-a); the hydraulic pump positioning bolts (5-e) fix the two-way hydraulic pump (5-b) and the main steel wire rope positioning rollers (5-g) coaxially on the main steel wire rope positioning slide table (5-h), and the main steel wire rope positioning rollers (5-g) drive the main shaft (5-0 of the hydraulic pump to rotate synchronously; the auxiliary steel wire rope positioning slide table (5-1) is arranged on the top surface of the steel wire rope positioning support table (5-a), the auxiliary steel wire rope positioning rollers (5-k) are arranged on the auxiliary steel wire rope positioning slide table (5-1), and the axis of the main steel wire rope positioning rollers (5-g) is in the same line as the axis of the auxiliary steel wire rope positioning rollers (5-k); the main steel wire rope positioning slide table (5-h) and the auxiliary steel wire rope positioning slide table (5-1) are provided with collinear through-holes in the two sides respectively, the steel wire rope clamping bolts (5-j) penetrate through the through-holes from one end to connect the main steel wire rope positioning slide table (5-h) and the auxiliary steel wire rope positioning slide table (5-1) together, and are tightened up at the other end by means of the steel wire rope clamping nuts (5-n), so that the main steel wire rope positioning rollers (5-g) and the auxiliary steel wire rope positioning rollers (5-k) can clamp the tested steel wire rope (3) under the action of squeezing force; the rims of the main steel wire rope positioning rollers (5-g) and the rims of the auxiliary steel wire rope positioning rollers (5-k) are provided with a groove respectively, in which the steel wire rope positioning friction liner (5-i) is installed, and the steel wire rope positioning friction liner (5-i) is provided with a rope groove.
4. The device for testing load-carrying properties of steel wire rope for friction hoist according to claim 1, wherein each of the loading hydraulic cylinders (1) is a double-acting hydraulic cylinder comprising a loading hydraulic cylinder jacket (1-a), a loading hydraulic cylinder pedestal (l-b), and a loading hydraulic cylinder piston rod (1-c); the front end of each loading hydraulic cylinder piston rod (1-c) is provided with a steel wire rope lock sleeve (1-d), the two end pigtails of the tested steel wire rope (3) connected with the loading hydraulic cylinders (1) are clamped in the steel wire rope lock sleeves (1-d) via installing steel wire rope locks (3-a), and pulling force is exerted on the tested steel wire rope (3) via the loading hydraulic cylinders (1); the two loading hydraulic cylinders serve as a driving side and a load side for each other, the hydraulic cylinder at the driving side drives its loading hydraulic cylinder piston rod (1-c) by adjusting the oil pressure at the oil inlet to pull the tested steel wire rope (3), while the hydraulic cylinder at the load side inhibit the tested steel wire rope (3) from pulling its loading hydraulic cylinder piston rod (1-c) by adjusting the oil pressure at the oil outlet.
5. The device for testing load-carrying properties of steel wire rope for friction hoist according to claim 1, wherein the number of the steel wire rope positioning devices (5) depends on the testing Date Recue/Date Received 2022-06-09 accuracy of the friction hoist with different diameter.
6. The device for testing load-carrying properties of steel wire rope for friction hoist according to claim 1, wherein the hole density of the hydraulic cylinder positioning holes (2-a) in the vertical direction depends on a testing requirement for adaptation of the vertical distance clamped by the two loading hydraulic cylinders (1) to the friction hoist with different diameter.
7. The device for testing load-carrying properties of steel wire rope for friction hoist according to claim 1, wherein the hole density of the positioning holes (6-a) in the circumferential direction depends on a testing requirement for adaptation of the arc enclosed by the wrap angle positioning device (4) and the steel wire rope positioning devices (5) to the friction hoist with different diameter and wrap angle.
8. A testing method by using the device for testing load-carrying properties of steel wire rope for friction hoist according to claims 1, 2, 3, or 4, comprising the following steps:
(a) installing the wrap angle positioning support table (4-h) on the wrap angle positioning pedestal (4-i), installing the wrap angle positioning lead screw (4-c), the wrap angle positioning lead screw nut (4-d) and the wrap angle positioning hand wheel (4-j) coaxially, fixing the wrap angle positioning slide table (4-b) to the wrap angle positioning lead screw nut (4-d), installing the positioning telescopic sleeve (4-a) axially on the wrap angle positioning slide table (4-b), installing the wrap angle positioning friction liners (4-g) in the groove of the wrap angle positioning roller (4-f), and installing the wrap angle positioning roller (4-0 on the top end of the positioning telescopic rod (4-e), to assemble a wrap angle positioning device (4);
(b) installing the steel wire rope positioning support table (5-a) on the steel wire rope positioning pedestal (5-d), installing the steel wire rope positioning lead screw (5-c), the steel wire rope positioning lead screw nut (5-m) and the steel wire rope positioning hand wheel (5-o) coaxially, fixing the main steel wire rope positioning slide table (5-h) to the steel wire rope positioning lead screw nut (5-m), installing the steel wire rope positioning friction liners (5-i) in the grooves of the main steel wire rope positioning rollers (5-g) and the auxiliary steel wire rope positioning rollers (5-k), fixing the two-way hydraulic pump (5-b) and the main steel wire rope positioning rollers (5-g) coaxially on the main steel wire rope positioning slide table (5-h) with the hydraulic pump positioning bolts (5-e), inserting the steel wire rope clamping bolts (5-j) from one end of the slide table though the through-holes to connect the main steel wire rope positioning slide table (5-h) and the auxiliary steel wire rope positioning slide table (5-1) together, and tightening the steel wire rope clamping bolts (5-j) with the steel wire rope clamping nuts (5-n) at the other end of the slide table, to assemble several steel wire rope positioning devices (5);
(c) based on the diameter D and wrap angle a of the friction hoist to which the tested steel wire rope belongs, installing the wrap angle positioning device (4) in the vertical direction on the linear section of the steel wire rope positioning platform (6) according to the positioning holes (6-a) at preset positions, installing the steel wire rope positioning devices (5) at an interval in the radial direction on the arc section of the steel wire rope positioning platform (6), tuming the steel wire rope positioning hand wheel (5-o) to push the steel wire rope positioning lead screw nut (5-m) to move back and forth, turning the wrap angle positioning hand wheel (4-j) to push the wrap angle positioning lead screw nut (4-d) to move back and Date Recue/Date Received 2022-06-09 forth, trimming the telescopic length of the positioning telescopic rod (4-e) to push the wrap angle positioning rollers (4-0 to move back and forth in a small field, till the diameter of the arc enclosed by the rims of the wrap angle positioning rollers (4-f) and the rims of the main steel wire rope positioning rollers (5-g) is equal to the diameter D of the friction hoist and the angle of the arc is equal to the wrap angle a of the friction hoist finally, then arranging the two loading hydraulic cylinders (1) side by side in the horizontal direction on the hydraulic cylinder positioning platform (2) via the hydraulic cylinder positioning holes (2-a), with the vertical distance between the two hydraulic cylinders expressed as follows:
D i D,=-0.+cos (a ¨ 21-)) 2 ;
(d) cutting the tested steel wire rope (3) in required length according to the telescopic length of the loading hydraulic cylinder piston rod (1-c) and the diameter D of the friction hoist, installing the steel wire rope locks (3-a) on the two end pigtails of the tested steel wire rope (3), clamping the steel wire rope locks (3-a) in the steel wire rope lock sleeves (1-d), and embedding the arc part of the tested steel wire rope (3) in the rope grooves of the wrap angle positioning friction liners (4-g) and the steel wire rope positioning friction liners (5-i);
(e) adjusting the oil pressure at the oil inlet of the hydraulic cylinder at the driving side and the oil pressure at the oil outlet of the hydraulic cylinder at the load side, and actuating the loading hydraulic cylinders (1) at low oil pressure, so that the tested steel wire rope (3) is tensioned up; tightening up the steel wire rope clamping nuts (5-n) so that the steel wire rope positioning friction liners (5-i) clamp the steel wire rope (3) tightly to avoid any relative slip between the steel wire rope positioning friction liners (5-i) and the tested steel wire rope (3);
(f) simulating a load FL] at the heavy load side and a load FL2 at the no-load side during actual friction hoisting according to the diameter D and wrap angle u of the friction hoist, and obtaining tangential force distribution fe on the tested steel wire rope (3) within the range of the wrap angle ct with the following formula:
{ 2F,,,e9 /-1 0 0 aR
4. The device for testing load-carrying properties of steel wire rope for friction hoist according to claim 1, wherein each of the loading hydraulic cylinders (1) is a double-acting hydraulic cylinder comprising a loading hydraulic cylinder jacket (1-a), a loading hydraulic cylinder pedestal (l-b), and a loading hydraulic cylinder piston rod (1-c); the front end of each loading hydraulic cylinder piston rod (1-c) is provided with a steel wire rope lock sleeve (1-d), the two end pigtails of the tested steel wire rope (3) connected with the loading hydraulic cylinders (1) are clamped in the steel wire rope lock sleeves (1-d) via installing steel wire rope locks (3-a), and pulling force is exerted on the tested steel wire rope (3) via the loading hydraulic cylinders (1); the two loading hydraulic cylinders serve as a driving side and a load side for each other, the hydraulic cylinder at the driving side drives its loading hydraulic cylinder piston rod (1-c) by adjusting the oil pressure at the oil inlet to pull the tested steel wire rope (3), while the hydraulic cylinder at the load side inhibit the tested steel wire rope (3) from pulling its loading hydraulic cylinder piston rod (1-c) by adjusting the oil pressure at the oil outlet.
5. The device for testing load-carrying properties of steel wire rope for friction hoist according to claim 1, wherein the number of the steel wire rope positioning devices (5) depends on the testing Date Recue/Date Received 2022-06-09 accuracy of the friction hoist with different diameter.
6. The device for testing load-carrying properties of steel wire rope for friction hoist according to claim 1, wherein the hole density of the hydraulic cylinder positioning holes (2-a) in the vertical direction depends on a testing requirement for adaptation of the vertical distance clamped by the two loading hydraulic cylinders (1) to the friction hoist with different diameter.
7. The device for testing load-carrying properties of steel wire rope for friction hoist according to claim 1, wherein the hole density of the positioning holes (6-a) in the circumferential direction depends on a testing requirement for adaptation of the arc enclosed by the wrap angle positioning device (4) and the steel wire rope positioning devices (5) to the friction hoist with different diameter and wrap angle.
8. A testing method by using the device for testing load-carrying properties of steel wire rope for friction hoist according to claims 1, 2, 3, or 4, comprising the following steps:
(a) installing the wrap angle positioning support table (4-h) on the wrap angle positioning pedestal (4-i), installing the wrap angle positioning lead screw (4-c), the wrap angle positioning lead screw nut (4-d) and the wrap angle positioning hand wheel (4-j) coaxially, fixing the wrap angle positioning slide table (4-b) to the wrap angle positioning lead screw nut (4-d), installing the positioning telescopic sleeve (4-a) axially on the wrap angle positioning slide table (4-b), installing the wrap angle positioning friction liners (4-g) in the groove of the wrap angle positioning roller (4-f), and installing the wrap angle positioning roller (4-0 on the top end of the positioning telescopic rod (4-e), to assemble a wrap angle positioning device (4);
(b) installing the steel wire rope positioning support table (5-a) on the steel wire rope positioning pedestal (5-d), installing the steel wire rope positioning lead screw (5-c), the steel wire rope positioning lead screw nut (5-m) and the steel wire rope positioning hand wheel (5-o) coaxially, fixing the main steel wire rope positioning slide table (5-h) to the steel wire rope positioning lead screw nut (5-m), installing the steel wire rope positioning friction liners (5-i) in the grooves of the main steel wire rope positioning rollers (5-g) and the auxiliary steel wire rope positioning rollers (5-k), fixing the two-way hydraulic pump (5-b) and the main steel wire rope positioning rollers (5-g) coaxially on the main steel wire rope positioning slide table (5-h) with the hydraulic pump positioning bolts (5-e), inserting the steel wire rope clamping bolts (5-j) from one end of the slide table though the through-holes to connect the main steel wire rope positioning slide table (5-h) and the auxiliary steel wire rope positioning slide table (5-1) together, and tightening the steel wire rope clamping bolts (5-j) with the steel wire rope clamping nuts (5-n) at the other end of the slide table, to assemble several steel wire rope positioning devices (5);
(c) based on the diameter D and wrap angle a of the friction hoist to which the tested steel wire rope belongs, installing the wrap angle positioning device (4) in the vertical direction on the linear section of the steel wire rope positioning platform (6) according to the positioning holes (6-a) at preset positions, installing the steel wire rope positioning devices (5) at an interval in the radial direction on the arc section of the steel wire rope positioning platform (6), tuming the steel wire rope positioning hand wheel (5-o) to push the steel wire rope positioning lead screw nut (5-m) to move back and forth, turning the wrap angle positioning hand wheel (4-j) to push the wrap angle positioning lead screw nut (4-d) to move back and Date Recue/Date Received 2022-06-09 forth, trimming the telescopic length of the positioning telescopic rod (4-e) to push the wrap angle positioning rollers (4-0 to move back and forth in a small field, till the diameter of the arc enclosed by the rims of the wrap angle positioning rollers (4-f) and the rims of the main steel wire rope positioning rollers (5-g) is equal to the diameter D of the friction hoist and the angle of the arc is equal to the wrap angle a of the friction hoist finally, then arranging the two loading hydraulic cylinders (1) side by side in the horizontal direction on the hydraulic cylinder positioning platform (2) via the hydraulic cylinder positioning holes (2-a), with the vertical distance between the two hydraulic cylinders expressed as follows:
D i D,=-0.+cos (a ¨ 21-)) 2 ;
(d) cutting the tested steel wire rope (3) in required length according to the telescopic length of the loading hydraulic cylinder piston rod (1-c) and the diameter D of the friction hoist, installing the steel wire rope locks (3-a) on the two end pigtails of the tested steel wire rope (3), clamping the steel wire rope locks (3-a) in the steel wire rope lock sleeves (1-d), and embedding the arc part of the tested steel wire rope (3) in the rope grooves of the wrap angle positioning friction liners (4-g) and the steel wire rope positioning friction liners (5-i);
(e) adjusting the oil pressure at the oil inlet of the hydraulic cylinder at the driving side and the oil pressure at the oil outlet of the hydraulic cylinder at the load side, and actuating the loading hydraulic cylinders (1) at low oil pressure, so that the tested steel wire rope (3) is tensioned up; tightening up the steel wire rope clamping nuts (5-n) so that the steel wire rope positioning friction liners (5-i) clamp the steel wire rope (3) tightly to avoid any relative slip between the steel wire rope positioning friction liners (5-i) and the tested steel wire rope (3);
(f) simulating a load FL] at the heavy load side and a load FL2 at the no-load side during actual friction hoisting according to the diameter D and wrap angle u of the friction hoist, and obtaining tangential force distribution fe on the tested steel wire rope (3) within the range of the wrap angle ct with the following formula:
{ 2F,,,e9 /-1 0 0 aR
4. = BD , 0 aR~O~ce wherein, 9 is the circumferential coordinate with the separation point of the steel wire rope at the driving side and the friction wheel as the origin and the counterclockwise direction as the positive direction, B is the width of the actual friction liner of the hoist, 11 is the friction = ln(FL, / FL2) coefficient of the actual friction liner, aR is the creeping arc angle within the wrap arc under the action of FL] and FLY, thus, obtaining the tangential forcesfi,f2,f3,f4,f5,f6 and f7 on the tested steel wire rope (3) at the main steel wire rope positioning rollers (5-g), adjusting the oil pressure at the oil discharge outlet of the two-way hydraulic pump (5-b) accordingly, and adding additional rotation damping to the Date Recue/Date Received 2022-06-09 main steel wire rope positioning rollers (5-g) according to the following formula:
1 F'L2 k ¨ F LI¨
A-Ff2+1;-Fft+f5+f6+f; , m1=kfir,M2 = kf2r,M3 = kf3r,M 4 = kf4r, M5 = kf5r, M6 =kf6r,M7=kf7r wherein, i1/11,M2,M3,M4,M5,M6,M7 are the simulated load torque at each two-way hydraulic pump (5-b), k is a compensation coefficient, and r is the radius of the main steel wire rope positioning roller (5-g), when the loading hydraulic cylinders (1) pull the tested steel wire rope (3), FLl¨kfl+kf2+kf3+kf4+1cfs+kf6+kf7+FL2; thus, simulating the actual steel wire rope pulling process of the friction hoist and the creeping process of the steel wire rope within the wrap arc in the friction hoisting process;
to test the tensile strength of the steel wire rope, the oil pressures of the loading hydraulic cylinders (1) and the two-way hydraulic pump (5-b) may be adjusted, so that the hydraulic cylinder at the driving side and the hydraulic cylinder at the load side pull the tested steel wire rope (3), so as to simulate the actual overload and secondary loading conditions of the friction hoist; at that point, whether the tested steel wire rope (3) meets the requirement for tensile strength can be judged by detecting whether the unit elongation of the steel wire rope is within an allowable threshold;
to test the fatigue life of the steel wire rope, the oil pressures of the loading hydraulic cylinders (1) and the two-way hydraulic pump (5-b) may be adjusted, so that the hydraulic cylinder at the driving side and the hydraulic cylinder at the load side pull the tested steel wire rope (3) alternately and cyclically, so as to simulate the actual coal hoisting process of the friction hoist; at that point, whether the tested steel wire rope (3) meets the requirement for fatigue life can be judged by detecting whether the percentage of broken wires and unit elongation of the steel wire rope (3) in multiple cycles are within allowable thresholds; in addition, since there is no time limitation on the actual coal loading and unloading process, the testing process can be accelerated greatly by adjusting the flow rates through the loading hydraulic cylinders (1) and the two-way hydraulic pump (5-b).
Date Recue/Date Received 2022-06-09
1 F'L2 k ¨ F LI¨
A-Ff2+1;-Fft+f5+f6+f; , m1=kfir,M2 = kf2r,M3 = kf3r,M 4 = kf4r, M5 = kf5r, M6 =kf6r,M7=kf7r wherein, i1/11,M2,M3,M4,M5,M6,M7 are the simulated load torque at each two-way hydraulic pump (5-b), k is a compensation coefficient, and r is the radius of the main steel wire rope positioning roller (5-g), when the loading hydraulic cylinders (1) pull the tested steel wire rope (3), FLl¨kfl+kf2+kf3+kf4+1cfs+kf6+kf7+FL2; thus, simulating the actual steel wire rope pulling process of the friction hoist and the creeping process of the steel wire rope within the wrap arc in the friction hoisting process;
to test the tensile strength of the steel wire rope, the oil pressures of the loading hydraulic cylinders (1) and the two-way hydraulic pump (5-b) may be adjusted, so that the hydraulic cylinder at the driving side and the hydraulic cylinder at the load side pull the tested steel wire rope (3), so as to simulate the actual overload and secondary loading conditions of the friction hoist; at that point, whether the tested steel wire rope (3) meets the requirement for tensile strength can be judged by detecting whether the unit elongation of the steel wire rope is within an allowable threshold;
to test the fatigue life of the steel wire rope, the oil pressures of the loading hydraulic cylinders (1) and the two-way hydraulic pump (5-b) may be adjusted, so that the hydraulic cylinder at the driving side and the hydraulic cylinder at the load side pull the tested steel wire rope (3) alternately and cyclically, so as to simulate the actual coal hoisting process of the friction hoist; at that point, whether the tested steel wire rope (3) meets the requirement for fatigue life can be judged by detecting whether the percentage of broken wires and unit elongation of the steel wire rope (3) in multiple cycles are within allowable thresholds; in addition, since there is no time limitation on the actual coal loading and unloading process, the testing process can be accelerated greatly by adjusting the flow rates through the loading hydraulic cylinders (1) and the two-way hydraulic pump (5-b).
Date Recue/Date Received 2022-06-09
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811177244.1A CN108956309B (en) | 2018-10-10 | 2018-10-10 | Friction drive hoist wirerope load-carrying properties test device and method |
| CN201811177244.1 | 2018-10-10 | ||
| PCT/CN2019/075868 WO2020073580A1 (en) | 2018-10-10 | 2019-02-22 | Device and method for testing load-carrying properties of wire rope for friction hoist |
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| CA3115559A1 CA3115559A1 (en) | 2020-04-16 |
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| CN108956309B (en) * | 2018-10-10 | 2019-10-25 | 中国矿业大学 | Friction drive hoist wirerope load-carrying properties test device and method |
| CN110186790A (en) * | 2019-05-23 | 2019-08-30 | 天津大学 | A kind of surgical instrument wirerope performance testing device and method |
| CN112268798B (en) * | 2020-10-15 | 2022-10-04 | 合肥工业大学 | Steel wire rope performance testing device for flexible cable driven rehabilitation robot and testing method thereof |
| CN113311134B (en) * | 2021-06-16 | 2022-03-01 | 中国地质大学（北京） | Coal and gas outburst simulation test bed |
| CN116399704B (en) * | 2023-04-26 | 2024-01-26 | 桐庐华邦五金工具有限公司 | Stretch force detection device for elastic rope |
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| US7591190B2 (en) * | 2006-02-27 | 2009-09-22 | American Fabricating, Llc | Test stand |
| CN100535633C (en) * | 2008-01-11 | 2009-09-02 | 中国矿业大学 | Multifunctional friction hoisting antiskid experimental device and method |
| JP2014235039A (en) * | 2013-05-31 | 2014-12-15 | 大電株式会社 | Fatigue testing method for wire |
| CN103954553B (en) * | 2014-04-15 | 2015-12-16 | 中国矿业大学 | The test unit of the dynamic micro tribology state of monitoring wire rope-friction lining and method |
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| CN104729987B (en) * | 2015-03-10 | 2017-03-01 | 中国矿业大学 | A kind of elevator steel wire rope, friction lining synthesis friction sensing device and method |
| CN104634686B (en) * | 2015-03-10 | 2017-05-03 | 中国矿业大学 | Twisted-type hoister steel wire rope interlayer friction detection device and method |
| CN105043885B (en) * | 2015-08-28 | 2019-01-11 | 中国水利水电夹江水工机械有限公司 | A kind of reel stress test device and its method |
| CN105584944B (en) * | 2016-03-04 | 2017-11-10 | 中国矿业大学 | A kind of boom hoist cable layer to layer transition detection means and method |
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| CN107167514A (en) * | 2017-06-19 | 2017-09-15 | 中国矿业大学 | A kind of Novel steel wire rope the cannot-harm-detection device and detection method |
| CN107500173B (en) * | 2017-08-21 | 2019-06-07 | 枣庄矿业（集团）有限责任公司蒋庄煤矿 | A kind of devices of brake systems in lifting and friction type winder |
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| CN108956309B (en) * | 2018-10-10 | 2019-10-25 | 中国矿业大学 | Friction drive hoist wirerope load-carrying properties test device and method |
-
2018
- 2018-10-10 CN CN201811177244.1A patent/CN108956309B/en active Active
-
2019
- 2019-02-22 WO PCT/CN2019/075868 patent/WO2020073580A1/en active Application Filing
- 2019-02-22 CA CA3115559A patent/CA3115559C/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN108956309A (en) | 2018-12-07 |
| CN108956309B (en) | 2019-10-25 |
| CA3115559A1 (en) | 2020-04-16 |
| WO2020073580A1 (en) | 2020-04-16 |
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