SU1514943A1 - Reverse-run hole expander - Google Patents

Abstract

The invention relates to the mining industry and can be used in the excavation of rising workings. The goal is to simplify the design. The extender consists of a housing (K) 1 with cones 4, an adapter 2 of a drill rod and a brake mechanism. The latter includes a slider 5 mounted on a 13 K 1 shank with the possibility of limited axial movement and spring-loaded supports 8 with rollers (P) 9 installed in slots 6 K 1 with the possibility of radial movement and rotation. The fingers 12, attached to K 1, are placed in the slots 11, made in the supports 8. While drilling the rising, the expander is rotated and moved upwards. In this case, the supports 8 occupy a lower position and are set at an angle ensuring the movement of P 9 along the wall of the rising one along a helical line. When the drill rod breaks off, K 1 freezes at R 9, wedging itself in the walls of the insurgent, and the supports 8 occupy the top position. After the fishing tool is connected to the drill stand, the expander is rotated in the direction of drilling and fed down, with the result that P 9 rolls around the wall of the riser, not preventing the lowering of the expander. 4 il.

Description

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The invention relates to the mining industry and can be used when shedding rising grades.

The purpose of the invention is to simplify the design.

Figure 1 shows the extender, the rodon section of figure 2 brake mechanism, a general view; on fig.Z about, while drilling; in fig. - the same when lowering the reamer into the well. The backstop dilator contains a body 1, an adapter 2 for a drill rod mounted on the body, arms 3 with cones and a brake mechanism made in the form of a slider 5 in radial slots 6 of which are mounted that can be moved by means of springs 7 of the support 8 with brake rollers 9 The stroke of the supports 8 is limited by the pins 10, and the stiffness of the springs 7 is chosen taking into account that the pressing force of the rollers 9 against the rising wall can provide braking of the expander relative to the rising wall when the drill rod is broken. Chamfers are made on the rollers 9 (not shown, which allow the spring-loaded rollers 9 to enter the mouth of the riser. In addition, the supports 8, on which the rollers 9 are mounted, can rotate in a vertical plane in the slots 6. In the supports there are grooves 11 in which The fingers 12 are attached to the housing 1. The slider 5 is mounted on the slots of the cylindrical shank 13 of the housing 1 with the possibility of limited vertical displacement between the end face 1 of the housing and the collar 15 of the shank. The sliding stroke rotates the supports 8 with rollers 9 in g 6 rides up or down depending on the direction of the rotary movement of the dilator in RECOVER.

The angles oi and ft of rotation of the supports with rollers characterize the angles of elevation of the helix along which the rollers 9 roll in when drilling or lowering the rotary extender along the well and depend on the speed of descent - the rise of the extender and on the frequency of its rotation. The angles oi and p are small, so the stroke of the slide 5 and the length of the shank are small.

The expander reverse stroke works as follows.

3

When drilling upward, the reamer is moved upward by means of a drilling rod with a rotation, carried out drilling with cones k. In this case, the slider 5 with the hindered rollers 9 relative to the wall of the ascending one is in the lowest position, abutting against the shoulder 15 (FIG. 3). Supports B

with rollers 9 due to the interaction of fingers 12 with grooves. 11 they are set at an angle io corresponding to the angle of inclination of the helix along which the rollers roll around the wall of the revolver during drilling. Due to the inclination of the supports 8 and the rollers 9 in the direction of drilling, the latter do not prevent the expander from moving upwards.

When a drill rod breaks off, body 1 is lowered onto slider 5, which is inhibited relative to the rising wall of the rollers 9, and freezes on the slider due to the frictional forces between the surfaces of the rollers 9 and the rising wall.

5 in rising. The strength of the friction between the rollers 9 and the rebels is provided by the total stiffness of the springs 7, pressing the rollers against the wall, taking into account the total area of contact between the rollers and the rebels, as well as the material of the rollers, the hardness of the rock, etc. When braking the expander support 8 with rollers 9 by moving

fingers 12 through slots 11 are rotated through an angle | 6 (Fig.). The slider 5 occupies the upper position, adjacent to the end 14,

After screwing the remaining in

the well of a drilling rod with a fishing device, such as a tap, braked in an ascending reamer is rotated in the direction of drilling and, feeding it down, is removed from the rebel. In this case, the rollers 9 roll along a helix and do not prevent the reamer from moving downwards. Similarly, the spreader is lowered after completion

drilling out the uprising.

Claims (1)

Invention Formula Back expander, including case with cones, drill stem adapter connected to the case, brake mechanism having a slide located on the body tail with the possibility of limited axial movement and joint rotation, and spring-loaded supports with rollers mounted on the slide with the possibility of radial movement, characterized in that, in order to simplify the construction, the supports are mounted in a slider with the possibility of rotation in the vertical plane and in them grooves are made, while the body has fingers attached to it, placed in the slots of the supports, with the possibility of rotation of the supports when moving the slide along the body tail. 1 gjtJe.Z rs.