CN101839844B - Method for measuring factor of friction between ring mould and pressing roll of granulator and material - Google Patents

Abstract

The invention discloses a method for measuring the factor of friction between the ring mould and pressing roll of granulator and a material and aims to solve a large error problem of the traditional measurement method. The measurement method adopts a ring mould sliding plate which is the flat extended surface of the ring mould of the granulator and has the same material, surface finishment, mould hole shape, mould hole size, aperture ratio and mould hole arrangement mode with the ring mould; a pressing roll sliding plate is the flat extended surface of the pressing roll of the granulator and has the same material and surface finishment as the pressing roll, and the surface of the pressing roll sliding plate is provided with wire drawing grooves or honeycomb holes which have the same shape, size and arrangement mode as those on the surface of the pressing roll; material is received at the feed inlet of the granulator, filled into the holes or grooves of the ring mould sliding plate and the pressing roll sliding plate, compacted and flattened; and a material cup is placed at the feed inlet of the granulator to perform measurement. The measurement method simulates the condition of the friction between the ring mould and pressing roll of the granulator and the material to a maximum degree, and can accurately determine the factor of the friction between the ring mould and pressing roll of granulator and the material.

Description

Determination of Friction Coefficient method between the ring mould of granulator and pressure roller and the material

Technical field

The present invention relates to Determination of Friction Coefficient method, particularly Determination of Friction Coefficient method between a kind of ring mould of granulator and pressure roller and the material between the extruder member of a kind of feed manufacturing machine field granulator and the particulate material.

Background technology

Friction factor between granulator ring mould and pressure roller and the material is the parameter of particular importance, does not have this parameter, and the calculating of the Specifeca tion speeification of granulator can not be carried out, even all can not carry out the correlation theory derivation and the finite element analysis of granulator.

At present, Determination of Friction Coefficient method between the ring mould of granulator and pressure roller and the material, as shown in Figure 1.Friction factor comprises coefficient of static friction and kinetic friction coefficient, will make plane slide plate 1 with the material of material friction, and the length of slide plate 1 is L; The cup that certain material is housed is inverted on the slide plate, and the slide plate that slowly raises when material cup 2 begins to glide, is write down the height h of slide plate this moment on slide plate ₁Slowly reduce slide plate, the height h when writing down material cup 2 and on slide plate, stopping to slide ₂Coefficient of static friction and kinetic friction coefficient all can be tried to achieve by following formula:

$f=\tan \mathrm{\α}=h/\sqrt{L^2-h^2}$

F in the formula---friction factor;

The angle of α---slide plate and surface level;

L---slide plate length;

H---slide plate height, the slide plate height of wherein measuring coefficient of static friction is h ₁The slide plate height of measuring kinetic friction coefficient is h ₂

Above Determination of Friction Coefficient method exists obviously not enough, can not truly reflect the friction factor between ring mould and pressure roller and the material.Make the plane slide plate with materials such as steel, what measure is friction factor between the materials such as material and steel.But the ring mould of granulator and roller surface all are not the planes, are covered with the nib of perforation on the ring mould, and roller surface is provided with spin bath or honeycomb hole, and honeycomb hole is blind hole.In granulator when work, all be full of material in the nib of ring mould, the spin bath of pressure roller, mobile material not still with the steel friction, also simultaneously with the spin bath of the nib of ring mould and pressure roller in the material friction.Like this, friction factor is just closely related with shape, area, quantity, area percentage and the material properties of nib or spin bath.

There are big gap in ring mould that existing method is measured and the friction factor between pressure roller and the material with real friction factor, can not be used in the computation process of granulator Specifeca tion speeification.

Summary of the invention

The technical problem to be solved in the present invention is, Determination of Friction Coefficient method between a kind of ring mould of granulator and pressure roller and the material is provided, and to overcome the existing inaccurate problem of assay method data, can accurately measure friction factor between ring mould and pressure roller and the material.

For solving above technical matters, Determination of Friction Coefficient method between the ring mould of a kind of granulator provided by the present invention and pressure roller and the material comprises the steps:

(1) make ring mould slide plate and pressing roll sliding plate, the length of described ring mould slide plate is L _m, the length of described pressing roll sliding plate is L _gDescribed ring mould slide plate is the planar development face of granulator ring mould, and with granulator ring mould identical material, surface smoothness, nib shape, nib size, percentage of open area and nib arrangement mode is arranged; Described pressing roll sliding plate is the planar development face of granulator pressure roller, has identical material, surface smoothness with the granulator pressure roller, and the surface of pressing roll sliding plate is provided with spin bath or the honeycomb hole identical with granulator roller surface shape, size and arrangement mode;

(2) access material at the charging aperture place of granulator, it is inserted compacting and floating in the nib of described ring mould slide plate; And then access material from the charging aperture of granulator, put into the material cup;

(3) described material cup is inverted on the described ring mould slide plate, the ring mould slide plate that slowly raises when the material cup begins to glide, is write down the ring mould slide plate height h that measures coefficient of static friction between ring mould slide plate and the material on ring mould slide plate _M1

(4) slowly reduce described ring mould slide plate, when the material cup stops gliding, write down the height h that measures the ring mould slide plate of kinetic friction coefficient between ring mould slide plate and the material on ring mould slide plate _M2

(5) access material at the charging aperture place of granulator, it is inserted compacting and floating in the spin bath of described pressing roll sliding plate or the honeycomb hole;

(6) described material cup is inverted on the described pressing roll sliding plate, the pressing roll sliding plate that slowly raises when the material cup begins to glide, is write down the pressing roll sliding plate height h that measures coefficient of static friction between pressing roll sliding plate and the material on pressing roll sliding plate _G1

(7) slowly reduce described pressing roll sliding plate, when the material cup stops gliding, write down the height h that measures the pressing roll sliding plate of kinetic friction coefficient between pressing roll sliding plate and the material on pressing roll sliding plate _G2

(8) parameter that records more than the basis calculates the coefficient of static friction f between ring mould slide plate and the material _M1For:

$f_{m1}=h_{m1}/\sqrt{{L_m}^2-{h_{m1}}^2}$

Kinetic friction coefficient f between ring mould slide plate and the material _M2For:

$f_{m2}=h_{m2}/\sqrt{{L_m}^2-{h_{m2}}^2}$

Coefficient of static friction f between pressing roll sliding plate and the material _G1For:

$f_{g1}=h_{g1}/\sqrt{{L_g}^2-{h_{g1}}^2}$

Kinetic friction coefficient f between pressing roll sliding plate and the material _G2For:

$f_{g2}=h_{g2}/\sqrt{{L_g}^2-{h_{g2}}^2}.$

With respect to prior art; the present invention has obtained following beneficial effect: this assay method is simulated andfrictional conditions between the ring mould of granulator and pressure roller and the material to greatest extent; can accurately measure the friction factor between granulator ring mould and pressure roller and the material, for the calculating of granulator Specifeca tion speeification provides accurate foundation.

Description of drawings

Fig. 1 is a material measuring friction coefficient method.

Fig. 2 is the employed ring mould of assay method of the present invention skateboard figure.

Fig. 3 is the employed pressing roll sliding plate structural drawing of assay method of the present invention.

Among the figure: 1 slide plate, 2 material cups.

Embodiment

Be covered with the nib of perforation on the ring mould of granulator, roller surface is provided with spin bath or honeycomb hole, and honeycomb hole is blind hole, and there are shapes such as triangle, square, arc in the spin bath cross section.Material enters the compression chamber of granulator from the charging aperture of granulator; be brought into then in the gap of encircling mould and pressure roller and suppress, follow material extrusion molding from the nib of ring mould, cut into the particle of certain-length by cutting knife; shaped granule is discharged by discharging opening, finishes whole pelletization.

The friction factor of measuring between granulator ring mould and pressure roller and the material is most important to the calculating of the Specifeca tion speeification of granulator; Determination of Friction Coefficient method between the ring mould of granulator of the present invention and pressure roller and the material; comprise the steps: that (1) makes ring mould slide plate and pressing roll sliding plate, the length of described ring mould slide plate is L _m, the length of described pressing roll sliding plate is L _gDescribed ring mould slide plate is the planar development face of granulator ring mould, and with granulator ring mould identical material, surface smoothness, nib shape, nib size, percentage of open area and nib arrangement mode is arranged; Described pressing roll sliding plate is the planar development face of granulator pressure roller, has identical material, surface smoothness with the granulator pressure roller, and the surface of pressing roll sliding plate is provided with spin bath or the honeycomb hole identical with granulator roller surface shape, size and arrangement mode; (2) access material at the charging aperture place of granulator, it is inserted compacting and floating in the nib of described ring mould slide plate; And then access material from the charging aperture of granulator, put into the material cup; (3) described material cup is inverted on the described ring mould slide plate, the ring mould slide plate that slowly raises when the material cup begins to glide, is write down the ring mould slide plate height h that measures coefficient of static friction between ring mould slide plate and the material on ring mould slide plate _M1(4) slowly reduce described ring mould slide plate, when the material cup stops gliding, write down the height h that measures the ring mould slide plate of kinetic friction coefficient between ring mould slide plate and the material on ring mould slide plate _M2(5) access material at the charging aperture place of granulator, it is inserted compacting and floating in the spin bath of described pressing roll sliding plate or the honeycomb hole; (6) described material cup is inverted on the described pressing roll sliding plate, the pressing roll sliding plate that slowly raises when the material cup begins to glide, is write down the pressing roll sliding plate height h that measures coefficient of static friction between pressing roll sliding plate and the material on pressing roll sliding plate _G1(7) slowly reduce described pressing roll sliding plate, when the material cup stops gliding, write down the height h that measures the pressing roll sliding plate of kinetic friction coefficient between pressing roll sliding plate and the material on pressing roll sliding plate _G2

According to the above parameter that records, can calculate the coefficient of static friction f between ring mould slide plate and the material _M1For:

$f_{m1}=h_{m1}/\sqrt{{L_m}^2-{h_{m1}}^2}$

Kinetic friction coefficient f between ring mould slide plate and the material _M2For:

$f_{m2}=h_{m2}/\sqrt{{L_m}^2-{h_{m2}}^2}$

Coefficient of static friction f between pressing roll sliding plate and the material _G1For:

$f_{g1}=h_{g1}/\sqrt{{L_g}^2-{h_{g1}}^2}$

Kinetic friction coefficient f between pressing roll sliding plate and the material _G2For:

$f_{g2}=h_{g2}/\sqrt{{L_g}^2-{h_{g2}}^2}$

Assay method of the present invention is simulated andfrictional conditions between the ring mould of granulator and pressure roller and the material to greatest extent, can accurately measure the friction factor between granulator ring mould and pressure roller and the material, for the calculating of granulator Specifeca tion speeification provides accurate foundation.

Fig. 2 is the employed a kind of ring mould skateboard figure of assay method of the present invention, is the planar development face of granulator ring mould, and with granulator ring mould identical material, surface smoothness, nib shape, nib size, percentage of open area and nib arrangement mode is arranged.

Fig. 3 is the employed a kind of pressing roll sliding plate structural drawing of assay method of the present invention; planar development face for the granulator pressure roller; have identical material, surface smoothness with the granulator pressure roller, the surface of pressing roll sliding plate is provided with and granulator roller surface shape, size and the identical spin bath of arrangement mode.

In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop in the protection domain of requirement of the present invention.

Claims (1)

1. Determination of Friction Coefficient method between the ring mould of a granulator and pressure roller and the material is characterized in that, comprises the steps:

(1) make ring mould slide plate and pressing roll sliding plate, the length of described ring mould slide plate is L _m, the length of described pressing roll sliding plate is L _gDescribed ring mould slide plate is the planar development face of granulator ring mould, and with granulator ring mould identical material, surface smoothness, nib shape, nib size, percentage of open area and nib arrangement mode is arranged; Described pressing roll sliding plate is the planar development face of granulator pressure roller, has identical material, surface smoothness with the granulator pressure roller, and the surface of pressing roll sliding plate is provided with spin bath or the honeycomb hole identical with granulator roller surface shape, size and arrangement mode;

(2) access material at the charging aperture place of granulator, it is inserted compacting and floating in the nib of described ring mould slide plate; And then access material from the charging aperture of granulator, put into the material cup;

(3) described material cup is inverted on the described ring mould slide plate, the ring mould slide plate that slowly raises when the material cup begins to glide, is write down the ring mould slide plate height h that measures coefficient of static friction between ring mould slide plate and the material on ring mould slide plate _M1

(4) slowly reduce described ring mould slide plate, when the material cup stops gliding, write down the height h that measures the ring mould slide plate of kinetic friction coefficient between ring mould slide plate and the material on ring mould slide plate _M2

(5) access material at the charging aperture place of granulator, it is inserted compacting and floating in the spin bath of described pressing roll sliding plate or the honeycomb hole;

(6) described material cup is inverted on the described pressing roll sliding plate, the pressing roll sliding plate that slowly raises when the material cup begins to glide, is write down the pressing roll sliding plate height h that measures coefficient of static friction between pressing roll sliding plate and the material on pressing roll sliding plate _G1

(7) slowly reduce described pressing roll sliding plate, when the material cup stops gliding, write down the height h that measures the pressing roll sliding plate of kinetic friction coefficient between pressing roll sliding plate and the material on pressing roll sliding plate _G2

(8) parameter that records more than the basis calculates the coefficient of static friction f between ring mould slide plate and the material _M1For:

$f_{m1}=h_{m1}/\sqrt{{L_m}^2-{h_{m1}}^2}$

Kinetic friction coefficient f between ring mould slide plate and the material _M2For:

$f_{m2}=h_{m2}/\sqrt{{L_m}^2-{h_{m2}}^2}$

Coefficient of static friction f between pressing roll sliding plate and the material _G1For:

$f_{g1}=h_{g1}/\sqrt{{L_g}^2-{h_{g1}}^2}$

Kinetic friction coefficient f between pressing roll sliding plate and the material _G2For:

$f_{g2}=h_{g2}/\sqrt{{L_g}^2-{h_{g2}}^2}.$

Images