RU1826980C - Method for joining ends of conveyer belt - Google Patents

Abstract

Usage: in the process of manufacturing and repair of conveyor belts. SUMMARY OF THE INVENTION 1 the ends of a conveyor belt are cut, glue is applied to them, dried, laid, and then the adhesive seam is sealed from the center to the sides with a sealing tool. A vibrating impact tool is used as a sealing tool when it is continuously mixed and continuously pulsed. The tool is equipped with a striker with a working surface in the form of a spherical segment. The specific energy density of the pulsed action distributed over the area of the adhesive joint is 10-15 J / cm2, 1 s.p. crystals, 2 tablets, 2 ill.

Description

The invention relates to the manufacture and repair of rubber products, in particular conveyor belts, and can be used in metallurgical, coal, construction and other industries.

The purpose of the invention is to reduce the complexity and increase the strength of the connection.

This goal is achieved by the fact that in the method of connecting the ends of the conveyor belt, which consists in cutting the ends, smearing them with glue, drying, laying and subsequent sealing from the center to the sides with a sealing tool, according to the invention, the sealing of the adhesive joint is carried out with a vibrating impact tool its stirring and continuous pulse exposure

The vibro-impact tool is equipped with a brisk with a working surface in the form of a spherical segment

The energy density of the pulsed action, spread over the area of the glue line, is 10-15 J / cm.

Performing the compaction operation with a vibro-shock tool during its constant movement and continuous-pulse action allows us to mechanize the compaction process and, therefore, reduce its complexity. At the same time, the quality of the seal is improved and, on this basis, the strength of the joint is increased. This is confirmed by the following considerations.

According to the molecular (adsorption) theory, the bond strength of the ends of the conveyor belt is known to depend on the adhesive interaction of the adhesive with the surfaces to be bonded. One of the ways to improve the adhesion properties of joints (in addition to chemical and mechanical) is to improve the quality of sealing of joined surfaces by punching. All things being equal, the quality of the seal

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It does not depend on the pressure applied to the joined surfaces. Due to this pressure, air is removed from the seam. The process goes on two levels - macro and micro. In a first step, air is expelled from the lenses between the joined surfaces at a minimum pressure. But air is also in the pores of the surfaces to be glued under a layer of glue. Under the influence of a pressure much greater than in the first stage, it is squeezed out and also diffuses deep into the surfaces, and its residues in the lenses are squeezed to the edges of the tape. If the surfaces are not sufficiently porous, then the air is partially absorbed by the adhesive. Due to this, the depth of filling of the pores with glue increases.

The depth of filling (I) of the pores with glue and the pressure (P) are as follows

H (1-Ј + 2a P

R

where H is the height of the microroughness;

Pu is the initial air pressure in the recesses.

a - surface tension of the adhesive.

From the analysis of the first component of the sum of the above dependence it follows that an increase in pressure (P) leads to an increase in the depth of filling of pores with adhesive (h). The pressure value (P) must be within the calculated value. In the proposed solution, when using a vibro-impact tool (for example, a perforator), this indicator is controlled, since it corresponds to the technical characteristics of this (specific) tool.

The use of a continuous-pulse mode of action in the joint sealing process intensifies the process of penetration of the adhesive into the microroughness of the joined surfaces. In this case, the forces arising from the collision increase, fall and generate waves. Two forms of energy are formed in the compression waves: potential and kinetic. The strained layers of the rubber fabric tape, moving, do the work, which turns into the energy of elastic deformation and the kinematic energy of a part of the adjacent layer of the connecting seam, as well as the intermediate layer - adhesive.

Thus, the use of a vibro-impact tool to seal the adhesive joint not only reduces the complexity of this operation, but also increases the strength of the connection of the ends of the conveyor

tape due to the activation of adhesive processes on the one hand and the effect of converting the energy of elastic deformation of the material of the layers of the tape into kinematic

the energy of material particles in the layers of the tape, on the other hand.

It should be noted that the compaction process is controlled by the main parameters: the energy density of the pulsed action on the adhesive joint, the exposure time and the pulse frequency.

Provided, as mentioned above, with the technical data used

5 tools - on the one hand and the specific area of the hammer with the working surface in the form of a spherical segment - on the other. In the process, the tool can be replaced, or with the tool, the hammer,

0 or one or the other.

Equipping the vibro-impact tool with the striker with the working surface in the form of a spherical segment makes it possible to obtain the optimal pressing area, reduce the friction coefficient, increase the speed of movement of the contact area of the drummer base and, on this basis, increase the strength of the connection of the ends of the tape, as well as reduce the laboriousness of the sealing operation.

Particularly important is the shape of the base of the striker (striker) of the vibratory pulse tool. The most rational configuration interacting with a sealed connecting seam is the ball segment: the greatest amount of energy is transmitted, the contact area with the surface of the connecting seam increases at tool angles not equal to 90 ° (with so-called oblique impacts).

In the studies mentioned above, the strength characteristics of the joints were investigated at

5 using drummers with different configurations of the hammer (flat base in the form of a circle, with a spherical hemisphere of the base and with a spherical segment). The first two mentioned strikers after the first stage of testing

0 were rejected due to insufficient quality of adjustment (non-penetration during oblique impact, decrease in tool movement speed, inconsistency of the contact area between the tool and the surface of the seam and others).

The most acceptable striking indicators from the point of view of compaction quality and reduction of the laboriousness of the process were revealed when the base was in the form of a spherical segment (see Fig. 1): stable contact area in both direct and oblique impacts; a smooth tool speed is provided; at the optimum step of movement, areas with an unsealed seam are eliminated; the load from the working surface of the striker to the surface of the seam is transmitted fairly evenly during any impact and others.

When choosing the energy density of the pulsed action distributed over the area of the adhesive joint, within 10-15 J / cm, we proceeded from the considerations of ensuring optimal labor costs for the compaction process, on the one hand, and maximizing the bond strength for this particular joint using a specific vibro-shock tool with a striker in the form of a spherical segment of the calculated diameter - on the other hand.

When using a pulse energy density of less than 10 J / cm2, air is not completely removed from the adhesive seam, on the one hand, and, on the other hand, the process of filling micropores with glue is slowed down and the adhesion interaction of the glue with the connected surfaces of the tape ends is not sufficiently activated, as a result of this, the bond strength of the adhesive joint is not sufficiently increased.

When using the specific energy density of the pulsed action of more than 15 J / cm2, on the one hand, the complexity of the technological operation increases, since the step of moving the sealing tool must be reduced, since the mentioned density can be achieved using a specific vibration tool by summing the energy pulses from the seam area from strokes.

On the other hand, a significant increase in the strength of the joint is not achieved, since not only the air lenses are displaced, but also part of the adhesive layer from the space between the joined surfaces. As a result, the adhesive processes of the interaction of the adhesive with the bonded surfaces deteriorate.

In FIG. 1 shows a hammer of a vibro-impact tool (side view); in FIG. 2 - surface of the connected ends of the conveyor belt with traces of punching (top view).

The method of connecting the ends of the conveyor belt is as follows.

The ends of the tape 1 and 2 are separated in steps of 3, which are roughened, degreased and dried at 15-25 ° C for 10-20 mm. After this step, the 3 ends of tape 1 and 2 are washed twice (with intermediate drying) with 51K-38 glue. The second drying is carried out at 15-25 ° C for 10-15 minutes until tack. After drying, the ends of the tape 1, 2 are folded and by means of a perforator 4,

0 equipped with a striker 5 with a working surface in the form of a spherical segment (S 4.52 cm) are punched over the entire surface of the butt joint from the middle to the edges in directions 6 with overlapping traces 7 from the impact,

5 which corresponds to the speed of movement of the tool (striker 5) within 40-70 mm / s.

Area Density of Impulse Impact Energy

0 glue line, choose between 10-15 J / cm2,

The choice of the energy density of the pulsed action within the above ranges provides an increase in the strength of the compound at the optimum laboriousness of the compaction process.

In the exemplary embodiment, five choices of the values of the density of the pulsed action were tested (see Table 1).

0 The method is carried out by connecting the ends of the tape type TK-100 (GOST 2085) using glue cold cured type 51K-38, manufactured by the Saransk plant NTI and manual

5 electric perforator IE-4713 (GOST 25998-83) of the Daugavpil plant Power tool. Impact energy 1 J, impact frequency 40 str / s. A hammer was used in the form of a spherical segment with a working surface area of 4.52 cm. The tests were carried out in accordance with the requirements of GOST 6768-75 on a tensile testing machine FPZ-1000.

Option 1 - parameter values are selected outside the lower limits of the parameters of the claimed method.

Option 2 - the parameter values are selected at the lower bounds of the parameters of the claimed method.

0 Option 3 - the parameter values are selected in the range of average values of the parameters of the claimed method.

Option 4 - the parameter values are selected at the boundary of the upper limits of the parameters of the claimed method.

Option 5 - the parameter values are selected outside the upper limits of the parameters of the claimed method.

The results of the implementation of the variants of the method are presented in table. 2.

Claims (2)

SUMMARY OF THE INVENTION 1. A method for connecting the ends of a conveyor belt, including cutting the ends of the belt, applying them with glue, drying, laying and then sealing the adhesive seam from the center to the sides with a sealing tool, characterized in that, in order to reduce the complexity and increase the strength of the connection, sealing glutinous the seam is made by a vibro-shock tool with its constant movement and continuous pulse action with its energy density over the area of the adhesive seam 10-15 J / cm3. 2. The method according to l. 1, characterized in that they use a vibratory impact tool equipped with a hammer with a working surface in the form of a spherical segment. Table 1 Table 2 (("( rfcefcefceWi , ILL,. , 1 C) H T% i iMUfcAA  TO TV V ( UUUUUUUU LEARNING black sea / / / / SS / S / S {S / S // S, S S / A //// A // fS x Y x xx x x x x x x x xS yyNrV A 4 XX X x .XXXxx: / J 1 fie.Ј rfcefcefceWi , ILL,. , 1 C (S-f /) H T% iMUfcAAiy) TO TV V , S S / A //// A // fS  xS yyNrV A 4 XX X x X UUU1