SU1479607A1 - Telescopic drill rod - Google Patents

Abstract

This invention relates to a construction boring technique. The goal is to increase the reliability of the boom by simplifying the design. For this, the sleeve 3 is internally formed with a protrusion 6, and the guide elements 4 are rotatably mounted and have a profiled internal surface. To accommodate the protrusion 6, a radial sector groove is made in the elements 4. The bar has an inner 1 and outer 2 sections. In the initial position of sections 1 and 2, the gap 10 between the elements 4 and the outer surface of section 1 is smaller than the gap 9 between the latter and the clamping elements 5. When the drill contacts the ground, section 1 resists rotation. In this case, the protrusion 6 does not touch the end of the groove, which ensures the free position of the element 4 and the transfer of rotation from the section through the elements 5 to section 2. After that, section 1 begins to rotate, overcoming resistance from the effect of the soil on the drill. When wedging the elements 5, the protrusion 6 contacts the end of the groove and the bar is folded and raised. 5 il.

Description

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4 and the outer surface of section 1 is smaller than the gap 9 between the latter and the clamping elements 5. When the drill contacts the ground, section 1 resists rotation. In this case, the protrusion 6 does not touch the end of the groove, which ensures the free position of the element 4 and ne

This invention relates to a construction boring technique, namely to rods of boring machines.

The purpose of the invention is to increase the reliability of the rod operation by simplifying its design.

Figure 1 shows a telescopic drill rod, a slit; 2 and 3 are sections A-A and B-B in FIG. 1 JQ (bar in the free position of sections); 4 and 5 are the same, in a fixed position of the sections.

A telescopic drill rod includes an inner 1 and an outer 2 | 5 section with shaped, for example, square, outer surfaces, fixed to the end of the outer section 2 sleeve 3 with guide elements 4 located in it and spaced between them for example segmented, elements 5,

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in the sleeve 3 with the possibility of limited rotation at a certain angle "due to the presence on the inner surface of the sleeve 3 of the protrusion 6 located in the radial sector groove 7 of the guide element 4.

The clamping elements 5 are installed in the slots 8 of the sleeve 3 between the guide elements 4 having a profile, for example square, inner surface. The clamping elements 5 and the guiding elements 4 in the free position of the sections (Figures 2 and 3) cover the internal section 1 with gaps 9 and 10, respectively, and the gaps 10 are smaller than the gaps 9 .. "

The outer rod 2 is mounted in the rotator 11 with the possibility of free axial movement. The connection of the output gear of the rotator in the outer

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reducing rotation from section through elements 5 to section 2. Section 1 then begins to rotate, overcoming resistance from the effect of the soil on the drill. When wedging the elements 5, the protrusion 6 contacts the end of the groove and the bar is folded and raised. 5 il.

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the sections are, for example, carried out in the same way as between sections of the drill rod. The upper end of section 1 is suspended on a rope 12, the other end of which is connected to the winch drum (not shown). A drilling tool (not shown) is fixed at the lower end of section 1, the upper end of section 2 has a flange 13.

Telescopic drill rod works as follows.

The drill rod is lowered by straining the cable 12, with both sections 1 and 2 of the rod being lowered together, i.e. the rod moves downward in the shifted position. Then, with further movement (the depth of the well will become greater than the stroke of the outer section), the outer section 2 will hang on the rotator with a flange and then only the inner section will extend.

When the boom is lowered, the clamping elements 5 occupy the position shown in Fig. 2, and the guiding elements 4 the position shown in Fig. 3. A similar mutual position of these parts should be when lifting the rod. When winding the rope 12 onto the drum, raise section 1, which first rises alone, and then, resting against the body of the drilling tool at the bottom of section 2, pulls it up, and the rod in the folded position takes the upper initial position.

When the section 2 and the sleeve 3 are rotated clockwise (FIGS. 1 and 5), the guide members 4 rotate relative to the fixed section 1 within the angle allowed by the gap 10 (FIG. 3). At the same time, the clamping elements 5 are displaced clockwise and the gap 9 is reduced (Figures 2 and 4). Since the gap 10 is smaller than the gap 9, the guides 4 first begin to contact with section 1. When the drill contacts the ground, section 1 has a resistance to rotation. Then the guides 4 stop, and the sleeve 3 and the stop 6 continue to rotate until the gaps 9 are fully selected and the clamping elements 5 are seized. The stop 6 does not touch the end of the groove of the guide element 4, which ensures its free position (element 4) and transfer of rotation from section 1 to section 2 through clamping elements 5. Only after this, section 1 comes into rotation, overcoming resistance from the effect of the soil on the drill.

When reversely rotating (counterclockwise) section 2 and bushings 3, elements 5 and stop 6 will move in the same direction. The elements 5 of the wedge, the gap 9 will begin to grow to its original size. Then the stop 6 will abut the end of the slot of element 4. In this position, the gaps 10 will be equal to the original (fig.Z), and the gaps 9 will be selected in the opposite direction.

If the counterclockwise rotation is continued, the position of the elements 5 relative to section 1 will not change, i.e. the original gap 9 will be preserved. Thus, when rotated clockwise, the torque from section 2 to section 1 is transmitted by means of clamping elements 5, and during reverse rotation through guide elements 4 and the stop 6.

The self-aligning segmented elements 5, when seized, create significantly higher normal pressures N at the contact

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surfaces than the normal force in the contact parts 4 due to the greater size of the gap in the first than the second. Selecting the required clearance creates the required amount of normal pressure N in contact with part 5. From normal force N, the force of friction is formed, where f is the coefficient of friction. Due to the high friction force during the jamming of elements 5, along with the transmission of torque, the axial load is transferred from the outer section 2 to the inner section 1 (Figures 4 and 5). On the contrary, when the elements 5 are wedged, the stop 6 touches the end of the groove of the elements 5, the boom sections are raised and folded (figures 2 and 3).

Claims (1)

Invention Formula A telescopic drill rod, comprising an outer section, an inner section with a profiled outer surface, a sleeve mounted on the end of the outer section with guides arranged therein and clamping elements arranged between them, forming in the initial position of the sections a gap with the outer surface of the inner section that differs in that, in order to increase the reliability of its work by simplifying the design, the sleeve is made from the inside with a protrusion, and the guide elements are mounted with the possibility of rotation and have a profiled inner surface and a radial sector groove for accommodating the protrusion of the sleeve, wherein the gap in the initial position of the sections between the guide elements and the outer surface of the inner section is smaller than the gap between the latter and the clamping elements. Aa eight Phage.Z fieL 6-5 FIG. five