CN101793567A - Sliding friction temperature and strain measuring method and device of gasket and cable wire - Google Patents

Abstract

The invention relates to sliding friction temperature strain measuring method and device of a gasket and a cable wire. The device comprises a gasket, a cable wire, filamentous thermocouples, a temperature transmitter, strain foils, a strain signal conditioning module, a data collecting card and a computer. The method is characterized by comprising the following steps of: firstly, determining the temperature of the gasket and the position of a strain monitoring point according to the angle changing regulation of outer-ring wires of a cable wire strand and the angle range of a cable groove of the gasket; next, distributing the filamentous thermocouples and the strain foils on the gasket; respectively measuring the temperature and the strain by the filamentous thermocouples and the strain foils; and finally, completing the collection, the analysis processing and the preservation of the temperature and the strain by a data collecting and processing system in a sliding friction process. The strain measuring method can realize the dynamic real-time measurement and the multipoint synchronous measurement of the temperature and the strain of the gasket in the sliding friction process, has an accurate test result and is suitable for detecting the temperature and the strain of the gasket under a high and low speed sliding friction work condition. The strain measuring device has stable and reliable working performance, simple measuring method, compact structure and convenient installation.

Description

The sliding friction temperature of liner and wire rope and strain measurement method and device

Technical field

The present invention relates to a kind of temperature and strain measurement method and device, especially a kind ofly be applicable to liner temperature and strain measurement method and device when liner and wire rope slide.

Background technology

Friction drive hoist relies on the friction force between hoisting cable and the liner to come transferring power; Therefore, exist the danger of relative slip between liner and the wire rope, in case take place to skid at a high speed, a large amount of heat of friction will cause that the temperature of liner (especially surface in contact) sharply raises, thereby the liner mechanical property is reduced, and then cause the liner tribological property sharply to reduce, cause pernicious skidding accident; Not only destroy pit gear, but also jeopardize staff's life security, bring enormous economic loss to the country and people.The temperature of liner and strain variation rule will provide the important foundation data for high-performance liner development and the safe and reliable design of mine friction winding when therefore, accurately grasping sliding friction.At present, tribology behavior between research liner and the wire rope is all carried out on simulator stand, Chinese patent application number is 200510134988.1 to disclose a kind of " wire rope and liner high-speed friction testing machine ", and this testing machine is friction factor, sliding speed and the specific pressure in the energy measurement sliding friction process only.The measurement of liner temperature and strain does not also have effective detection method and measurement mechanism so far during for liner and wire rope slip.

Summary of the invention

Technical matters: it is easy to the purpose of this invention is to provide a kind of method, and compact conformation is easy for installation, the liner that accuracy of measurement is high and the sliding friction temperature of wire rope and strain measurement method and device.

Technical scheme: the sliding friction temperature of liner of the present invention and wire rope and strain measurement method:

A, at the wire rope position upper and lower settings, inside corresponding with its diameter be the circular arc grooving on liner and lower liner;

B, on the interior circular arc grooving end face of last liner, lay a plurality of thread thermopairs, on the interior circular arc grooving end face of lower liner, lay a plurality of foil gauges simultaneously;

C, on a plurality of thread thermopairs, connect a plurality of temperature transmitters corresponding, simultaneously in a plurality of foil gauges connections a plurality of strain signal conditioning module corresponding with a plurality of foil gauges with a plurality of thread thermopairs;

Before d, the work operation, return to zero by the strain signal conditioning module;

When e, work operation, fricative temperature converts temperature signal to voltage signal by a plurality of thread thermopairs and a plurality of temperature transmitter between interior circular arc grooving of last liner and the wire rope; Fricative strain converts strain signal to voltage signal by a plurality of foil gauges and a plurality of strain signal conditioning module between interior circular arc grooving of lower liner and the wire rope;

F, gather the output signal of a plurality of temperature transmitters and a plurality of strain signal conditioning module with data collecting card, the signal that collects is transferred to computing machine, data processor by computer-internal is analyzed, is stored and show voltage signal, obtains liner temperature and strain with the sliding time Changing Pattern.

The sliding friction temperature of liner of the present invention and wire rope and strain gauge means, it comprises last liner, the lower liner that is fastened on the wire rope, have a plurality of apertures on the circular arc grooving end face of last liner, be embedded with a plurality of thread thermopairs in a plurality of apertures, a plurality of thread thermopairs correspondence respectively are connected with a plurality of temperature transmitters; The circular arc grooving end face of lower liner is provided with a plurality of foil gauges, a plurality of foil gauges correspondence respectively are connected with a plurality of strain signal conditioning module, a plurality of temperature transmitters and a plurality of strain signal conditioning module are connected with data collecting card respectively, and data collecting card is connected with computing machine.

Described a plurality of thread thermopair and a plurality of temperature transmitter are respectively 3～10; Described a plurality of foil gauge is 3～5, and a plurality of strain signal conditioning module are respectively 6～10.

Beneficial effect: the present invention can realize the dynamic real-time measurement and the multiple spot synchro measure of liner temperature and strain in the sliding friction process, for this technical field provides a kind of new measuring method, and provide effective means for temperature and the stress characteristics of grasping hoister slip operating mode lower liner, be applicable to the detection of height ski-running kinetic friction operating mode lower liner temperature and strain, stable and reliable working performance.Its apparatus structure is simple, compact, and method is easy, and test result is accurate, and is easy for installation, easily implements, and has practicality widely.

Description of drawings

Fig. 1 is temperature of the present invention and strain testing principle schematic.

Fig. 2 is liner and wire rope sliding friction synoptic diagram.

Fig. 3 is the A-A section principle schematic of Fig. 2.

Fig. 4 is a contact area synoptic diagram of the present invention.

Among the figure: the last liner of 1-, 2-wire rope, 3-lower liner, the thread thermopair of 4-, 5-temperature transmitter, 6-foil gauge, 7-strain signal conditioning module, 8-data collecting card, 9-computing machine.

F-friction force, N-normal pressure, α ₁-the first contact area angle, α ₂-the second contact area angle, α ₃-Di three contact area angles.

Embodiment

Below in conjunction with in the accompanying drawing one embodiment of the present of invention being further described:

The sliding friction temperature of liner of the present invention and wire rope and strain gauge means mainly are made of last liner 1, lower liner 3, thread thermopair 4, temperature transmitter 5, foil gauge 6, strain signal conditioning module 7, data collecting card 8 and computing machine 9.Wherein, last liner 1, lower liner 3 symmetries are fastened on the wire rope 2, have 3～10 apertures on the circular arc grooving end face of last liner 1, and correspondence is buried 3～10 thread thermopairs 4 underground in 3～10 apertures, thread thermopair 4 shown in Fig. 1 is respectively 6, i.e. the first thread thermopair T ₁, the second thread thermopair T ₂, the 3rd thread thermopair T ₃, the 4th thread thermopair T ₄, the 5th thread thermopair T ₅, the 6th thread thermopair T ₆6 thread thermopairs 4 link to each other with corresponding 6 temperature transmitters 5; The circular arc grooving end face of lower liner 3 is provided with 3～5 foil gauges 6, and the foil gauge 6 shown in Fig. 1 is 3, and foil gauge 6 is mutually the foil gauge of 90 ° of directions, i.e. first couple of foil gauge S for twin shaft ₁And S ₂, second couple of foil gauge S ₃And S ₄,, the 3rd couple of foil gauge S ₅And S ₆, S in first pair of foil gauge ₁And S ₂Be mutually 90 ° of distributions, S in second pair of foil gauge ₃And S ₄Be mutually 90 ° of distributions, S in the 3rd pair of foil gauge ₅And S ₆Be mutually 90 ° of distributions, 3 foil gauge 66 strain signal conditioning module 7 corresponding with it link to each other; Temperature transmitter 5 links to each other with data collecting card 8 with strain signal conditioning module 7 simultaneously; Data collecting card 8 links to each other with computing machine 9.

The sliding friction temperature of liner of the present invention and wire rope and strain measurement method:

Fig. 2 is shown in Figure 3, at first determine liner temperature and strain detecting point position according to wire rope helical structure and upper and lower liner grooving angular range, the check point position is determined: six rope strand outer ring angle wire Changing Patterns according to 2 cross sections of wire rope in the sliding process can get:

In the formula, $\mathrm{\ω}=\frac{v}{d\·\tan \mathrm{\δ}},$ V is relative slip velocity, and d is a wirerope diameter, and δ is a wire rope rope strand spiral angle, i=I, II, III, IV, V, VI.

In addition, last liner 1 and lower liner 3 grooving angular ranges are respectively (φ ₁+ 2n π, φ ₂+ φ ₁+ 2n π), (π+φ ₁+ 2n π, π+φ ₁+ φ ₂+ 2n π), wherein: φ ₂+ 2 φ ₁=π.When

Angle value is in the grooving angular range of last liner 1 and lower liner 3, wire rope 2 rope strands and liner are in contact condition, and will go up liner 1 and lower liner 3 groovings and be divided into three periodically contact areas, as shown in Figure 4: wire rope rope strand shown in Fig. 4 a and liner contact range are in first contact area, the first contact area angle [alpha] ₁=0.22; Then, wire rope rope strand and liner contact range enter second contact area, the second contact area angle [alpha] ₂=0.6, shown in Fig. 4 b; Then, wire rope rope strand and liner contact range enter the 3rd contact area, the 3rd contact area angle [alpha] ₃=0.22, shown in Fig. 4 c; Sequential loop cycle contact according to this.Strain detecting point totally 6 places on the lower liner 3 lay respectively at the grooving bottom, are β and γ place apart from grooving center angle, shown in Fig. 4 b; The grooving surface large deformation that rapid temperature rise causes during for fear of slip is to the destruction of foil gauge 6, and foil gauge 6 sticking obedient positions are about 3mm apart from lower liner 3 grooving surfaces; Temperature detecting point position and strain detecting point position symmetry on the last liner 1, as shown in Figure 1.

, inside corresponding with its diameter in wire rope 2 position upper and lower settings be the circular arc grooving on liner 1 and lower liner 3; At last liner 1 side temperature point position drill diameter is that 1mm, the degree of depth are 3～10 holes of 3mm, and 3～10 thread thermopairs 3 are imbedded in the hole, and the chip of using liner 1 then fills up, and the thread thermopair 3 shown in Fig. 1 is 6; The foil gauge 6 that 3 twin shafts is mutually 90 ° of directions glues the strain detecting points that are posted on lower liner 3, leaves standstill after 2 hours and tests;

Before the work operation, return to zero by strain signal conditioning module 7;

When operation work, fricative temperature converts temperature signal to voltage signal through 6 temperature transmitters 5 respectively by 6 thread thermopairs 4 between last liner 1 interior circular arc grooving and the wire rope; In the lower liner 3 between circular arc groovings and the wire rope fricative strain convert strain signal to voltage signal through 6 strain signal conditioning module 7 respectively by 3 foil gauges 6;

Adopt data collecting card 8 to gather the output signal of 6 temperature transmitters 5 and 6 strain signal conditioning module 7, data collecting card 8 is imported computing machine 9 by USB interface with data with the temperature and the compliance voltage signal that are collected; Data processor in the computing machine 9 adopts the VB programming language to develop, and at first, data processor changes the voltage signal of gathering into by following computing formula the actual value of temperature and strain:

$T=\frac{350}{4}{V}_T-\frac{550}{4}$

$\mathrm{\ϵ}=-\frac{{4V}_{\mathrm{\ϵ}}}{K_0{V}_{\mathrm{cc}}}$

In the formula: T is the liner temperature, V _TBe temperature voltage, ε is the liner strain, V _εBe compliance voltage, K ₀Be foil gauge sensitivity coefficient, K ₀=2, V _CcBe driving voltage, V _Cc=2.5V.Then, temperature and strain actual value that data processor is corresponding constantly with difference are plotted in the coordinate system, and preserve liner temperature and strain data, thus realize data are carried out real-time analysis, storage and demonstration, obtain liner temperature and strain with the sliding time Changing Pattern.

Claims (4)

1. the sliding friction temperature and the strain measurement method of liner and wire rope is characterized in that:

A, upper and lower settings is corresponding with its diameter at wire rope (2) position, inside is the circular arc grooving last liner (1) and lower liner (3);

B, on the interior circular arc grooving end face of last liner (1), lay a plurality of thread thermopairs (4), on the interior circular arc grooving end face of lower liner (3), lay a plurality of foil gauges (6) simultaneously;

C, go up to connect a plurality of temperature transmitters (5) corresponding with a plurality of thread thermopairs (4) at a plurality of thread thermopairs (4), the while is in a plurality of foil gauges (6) connection a plurality of strain signal conditioning module (7) corresponding with a plurality of foil gauges (6);

Before d, the work operation, return to zero by strain signal conditioning module (7);

When e, work operation, fricative temperature converts temperature signal to voltage signal by a plurality of thread thermopairs (4) and a plurality of temperature transmitter (5) between interior circular arc grooving of last liner (1) and the wire rope; Fricative strain converts strain signal to voltage signal by a plurality of foil gauges (6) and a plurality of strain signal conditioning module (7) between interior circular arc grooving of lower liner (3) and the wire rope;

F, gather the output signal of a plurality of temperature transmitters (5) and a plurality of strain signal conditioning module (7) with data collecting card (8), the signal that collects is transferred to computing machine (9), by the data processor that computing machine (9) is inner voltage signal is analyzed, stored and shows, obtain liner temperature and strain with the sliding time Changing Pattern.

2. the liner of method and the sliding friction temperature and the strain gauge means of wire rope according to claim 1, it is characterized in that: it comprises last liner (1), the lower liner (3) that is fastened on the wire rope (2), have a plurality of apertures on the circular arc grooving end face of last liner (1), be embedded with a plurality of thread thermopairs (4) in a plurality of apertures, a plurality of thread thermopairs (4) correspondence respectively are connected with a plurality of temperature transmitters (5); The circular arc grooving end face of lower liner (3) is provided with a plurality of foil gauges (6), a plurality of foil gauges (6) correspondence respectively are connected with a plurality of strain signal conditioning module (7), a plurality of temperature transmitters (5) are connected with data collecting card (8) respectively with a plurality of strain signal conditioning module (7), and data collecting card (8) is connected with computing machine (9).

3. the sliding friction temperature and the strain gauge means of liner as claimed in claim 2 and wire rope is characterized in that: described a plurality of thread thermopairs (4) and a plurality of temperature transmitter (5) are respectively 3～10.

4. the sliding friction temperature and the strain gauge means of liner as claimed in claim 2 and wire rope is characterized in that: described a plurality of foil gauges (6) are 3～5, and a plurality of strain signal conditioning module (7) are 6～10.

Images