RU2612415C1 - Method of selective assembly of insert bit - Google Patents

Abstract

FIELD: mining engineering.

SUBSTANCE: invention relates to drilling equipment, specifically for drilling insert bits. According to the method of selective assembly of insert bit, the paws and a roller shall be pre-numbered, one shall measure the size of a paw on the paw support, a roller on the roller support, shall be entered into the personal computer (PC), where a special program selects the optimal combination of paws and rollers numbers, then bit sections shall be collected and welded. One shall pre-measure the thickness of slotted plugs, washers and caps tp, tw, tc, enter them into the computer, calculate diametric gaps for all possible combinations of paws and rollers of large and small insert bits, linear gaps of large and small sliding support of insert bit and geometrical parameters of washers, slotted plugs and caps, then the software generates a table with the optimal combination of numbers of paws and rollers, and the minimum necessary clearances of slotted plugs, washers and caps for an insert bit are determined as per some mathematical expressions.

EFFECT: invention can improve a resource of insert bit support.

3 dwg

Description

The invention relates to drilling equipment, and in particular to cone drill bits.

There is a method of assembling roller cone bits with a random selection of paws and cones, as well as a random arrangement of bits from sections (Sopin PI, Bogomolov PM et al. Roller cone bits and drill heads: Catalog. - M .: TSINTIKHIMNeftemash, 1990, p. 54 -56).

The disadvantage of this method is that the assembly of paws and cones is carried out arbitrarily within the tolerance and, accordingly, different diametrical and linear gaps appear and, as a result, the working surfaces of the cone bit support are unevenly loaded. Another significant drawback is that sections with a wide spread of gaps can be used in the bit, and the resource of the cone bit is reduced to the resource of the section collected by the gaps that are most different from the gaps of the other two sections.

There is a method of assembling the support of a cone bit, in which the batch of paws and cones is sorted in increasing order of the difference between the radial plain bearings, and in the case of making a batch of bits more than 50 pieces, the paws and cones are divided into size groups, within which they are collected in random order (No. 2140517, ЕВВ 10/22, publ. 10/27/1999).

The disadvantage of this method is that in the process of sorting the paws and cones the linear dimension that causes the uneven load of the thrust sliding bearing is not taken into account, and random assembly of cones and paws in the section is not excluded within the size groups. Also, sections with a large spread of linear and diametrical gaps can be assembled in bits.

There is a known method of assembling the support of a cone bit, where the legs and cones are numbered, and their linear and diametrical dimensions D, d, H, h, Dш, dш, Нш, hш, are measured and entered into the computer, and a special program calculates the optimal clearances for these sizes ΔR and ΔH (RF patent No. 2184203, ЕВВ 10/20, publ. June 27, 2002).

The disadvantage of this method is that it does not completely exclude the accidental assembly of paws and cones in the section; this is due to the fact that the paws and cones have already been made, and their linear and diametrical sizes are already available and it will not be possible for the manufacturer to get the optimal clearance in the radial and thrust bearings of the cone bit, and a special program will choose the sizes closest in value, while The gaps ΔR and ΔН may not be optimal.

The aim of the present invention is to increase the resource support bearings cone bit by optimizing the distribution of loads transferred from weapons to the support and, as a result, increase the resource bit.

This goal is achieved in that the method of selective assembly of the cone bit, which consists in the fact that the paws and cones are pre-numbered, measure the dimensions of the paws D, d, H, h on the paw support, cones Dш, dш, Нш and hш in the cone support, in a PC, where a special program selects the optimal combination of paw numbers and cones, after which the sections of the bit are assembled, according to the invention, the thickness of the split bushings, washers and caps tv, tp, tk is pre-measured, they are entered into the PC, calculated for all possible combinations of paws and cone diametrically ΔD and Δd, the linear gaps of the large and small cone of the roller cone bit ΔН and Δh, and the geometric parameters of the washers, split bushings and caps, then the program creates a table with the optimal combination of the numbers of paws and cones, while minimizing the necessary clearances of split bushings, washers and caps Lopt.v, Lopt.sh, Lopt.d.kolp. for the operation of the cone bit is determined from the condition:

Lopt.v = ΔD-2 * tv;

Lopt.sh = ΔH-2 * tsh;

Lopt.d.colp. = Δd-2 * tк, where

ΔD is the diametrical clearance of the large sliding support of the cone bit;

tv is the thickness of the split sleeve;

ΔН is the linear clearance of the large sliding support of the cone bit;

tш - washer thickness;

Δd is the clearance of the small sliding support of the cone bit;

tk is the thickness of the cap.

The present invention, in comparison with the prototype, revealed the presence of new features of the method, namely, that the selective assembly can go in three parameters at once, which determine the uniform distribution of the load along the support, and to obtain a constant gap, different geometrical parameters are used for the split sleeves, washers, caps. This leads to uniform wear of all bearings cone bit. Thus, the claimed method of assembling bits meets the criteria of the invention of "novelty."

The attached figure 1 shows the support legs and support cones; in FIG. 2 - sleeve, washer, cap; in FIG. 3 shows the assembly of a cone, paw, sleeve, washer, cap.

The method is as follows.

Paws 1 and cone 2 of cone bit are pre-numbered. Then measure the dimensions of the paws D, d, H, h on the paw support, cones Dш, dш, Нш and hш in the cone support, as well as the thickness of the split sleeves 3, washers 4 and caps 5 tv, tш, tк. Then these dimensions are entered in the PC, where, using a special program, the necessary geometric parameters are selected for split bushings, washers and caps (Fig. 2). Then collect the legs 1, cones 2, split bushings 3, washers 4 and caps 5 in separate sections, maintaining the necessary gaps between all components, which are calculated by the following formulas:

ΔD = Dш-D is the diametrical clearance of the large sliding support of the cone bit;

Δd = dш-d is the gap of the small sliding support of the cone bit;

ΔН = Нш-Н - linear clearance of the large sliding support of the rolling cone bit;

Δh = hш-h is the linear clearance of the small sliding support of the cone bit, where

D, d are the diameters of the large and small radial plain bearings of the support legs;

H, h - linear dimensions from the ball track to the large and small thrust thrust bearings of the paws, respectively;

Dш, dш - the diameters of the large and small radial bearings of the cone bearings;

Нш and hш - linear dimensions from the ball track to the large and small thrust bearings of the cone, respectively.

Next, calculate the minimum necessary clearances for operation of the cone bit for split sleeves 3, washers 4 and caps 5:

Lopt.v = ΔD-2 * tv;

Lopt.sh = ΔH-2 * tsh;

Lopt.d.colp. = Δd-2 * tк, where

tв, tш, tк - thickness of the split sleeve, washer and cap.

Next, the cone bit is assembled from sections with close gaps in value, thereby completely eliminating the accidental assembly of paws 1 and cones 2, since the same necessary clearances are always maintained in the pair of cone due to various parameters of the split sleeve 3, washer 4 and cap 5. Due to this, the bearings of all three sections of the cone bit simultaneously come into operation, thereby increasing the resistance of the cone bit support. Then sections of the cone bit are welded.

The proposed method for assembling a cone bit increases the resource of the cone bit support due to the fact that all the working surfaces of the cone come into operation at the same time and the load transmitted from the bottom is distributed evenly over the bearing surface, reducing the risk of large peak loads on a particular section of the bearing. Due to the fact that sections with only equal gaps participate in the assembly of the bit, the load transferred from the bottom to the bit is evenly distributed over all supports of the cone bit.

Claims (14)

The method of selective assembly of the cone bit, which consists in the fact that the paws and cones are pre-numbered, measure the dimensions of the paws D, d, H, h on the support of the paws, cones Dш, dш, Hш and hш in the cone support are entered into the PC, where a special program selects the optimal combination of paw and cone numbers, after which the sections of the bit are assembled and welded, characterized in that the thickness of the split bushings, washers and caps tv, tш, tк is pre-measured , enter them into the PC, calculate for all possible combinations of paws and cones diametrical gaps of the large and small sliding supports of the cone bit ΔD and Δd, linear gaps of the large and small sliding supports of the cone bit ΔH and Δh and the geometric parameters of the washers, split bushings and caps, then the program forms a table with the optimal combination of paw and roller cone numbers, with the minimum necessary clearances of split bushings, washers and caps Lopt.v, Lopt.sh, Lopt.d.kolp. for the operation of the cone bit is determined from the condition: Lopt.v = ΔD-2 * tv; Lopt.sh = ΔH-2 * tsh; Lopt.d.colp. = Δd-2 * tк, where ΔD is the diametrical clearance of the large sliding support of the cone bit; tv is the thickness of the split sleeve; ΔН is the linear clearance of the large sliding support of the cone bit; tш - washer thickness; Δd is the clearance of the small sliding support of the cone bit; tк - cap thickness; D, d are the diameters of the large and small radial plain bearings of the support legs; H, h - linear dimensions from the ball track to the large and small thrust thrust bearings of the paws, respectively; Dш, dш - the diameters of the large and small radial bearings of the cone bearings; Нш and hш - linear dimensions from the ball track to the large and small thrust bearings of the cone, respectively.

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