Prestressed steel strand core tube capable of crushing rock slag

Abstract

The present invention discloses a prestressed steel strand core tube capable of crushing rock slag, which is composed of a steel strand salvage device combination, a core outer tube assembly, and a core inner tube assembly, wherein the core inner tube assembly comprises a double-end track-changing threaded core inner tube, a track-changing threaded inner tube joint, and a track-changing threaded retaining spring seat, a spearhead connected to a recovery tube, a spring-claw is loaded inside the recovery tube, one end of the recovery tube is connected to a spring-claw rack, one end of the spring-claw rack has an adjustment thread connected to a track-changing threaded inner tube joint, one end of the track-changing threaded inner tube joint is connected to a double-end track-changing threaded core inner tube, and one end of the double-end track-changing threaded core inner tube is connected to a track-changing threaded retaining spring seat. The present invention can crush rock slag and clean up accumulated rock powder by rotating the drill rod for 1-2 minutes, greatly reducing the labor intensity of the operator and the wear of the machine, and increasing the economic benefits of the workers and the mine.

Description

[0001] Technical Field The present invention relates to a prestressed steel strand core tube capable of crushing rock debris during the process of changing the prestressed steel strand in multi-angle drilling and coring.

[0002] Background technology In the process of horizontal drilling coring, water is needed to cool the drill bit to flush out rock powder. Because the deep drill hole will slope downward and cause water to accumulate at the bottom of the hole, each time the core is repeatedly taken, after the core is pulled out, when the core inner tube is lifted out with the prestressed steel strand salvage device, the small annular gap between the core inner tube and the drill rod will generate negative pressure, sucking back some rock slag and rock powder. As the pressure decreases, the rock slag and rock powder will sink into the drill rod. When the prestressed steel strand is used to send the empty core inner tube again, the rock slag and rock powder will prevent the core inner tube from reaching the bottom of the hole. If the drill rod is rotated and the core inner tube assembly does not rotate, the core inner tube can be helped to crush the rock slag and clean up the accumulated rock powder, thus solving the problem that the core inner tube cannot reach the bottom of the hole. Because there is a bearing between the conventional core tube assembly and the core inner tube, the core inner tube is stuck by the rock debris and drill rod and rotates together with the drill rod, and the rock debris cannot be crushed. The core inner tube cannot be sent to the bottom of the hole. In this case, all the drill rods have to be pulled out manually, and the stuck rock debris and rock powder have to be cleaned before all the drill rods are sent into the hole to continue drilling. For example, it will waste 2-3 hours to pull out and send in a 300-meter drill rod.

[0003] Invention content The technical problem solved by the present invention is: when the prestressed steel strand salvage device is used to send the core inner tube, it will encounter the obstruction of rock slag and rock powder, resulting in the problem that the core inner tube cannot be sent to the bottom of the hole. The annular gap between the core inner tube and the drill rod is only 2mm-3mm. Although the prestressed steel strand has high toughness and strength, the core inner tube can be sent to a depth of 300 meters. The more rock slag and rock powder are at the bottom of the hole, the more rock slag and rock powder will be stuck in the core inner tube. If the drilling task is a hole of more than 400 meters, the feeding speed will be slow, and the rock slag will be stuck in the core inner tube and cannot be sent in. If the rock slag and the accumulated rock powder are solved by rotating the drill rod, the conventional core tube assembly and the core inner tube can be rotated separately, which cannot solve the problem that the rock slag and rock powder are stuck in the core inner tube. The present invention discloses a prestressed steel strand core tube that can crush rock slag. The right-hand rotation of the prestressed steel strand and the right-hand rotation of the drill rod are the same, and the drill rod is rotated to achieve the purpose of crushing the rock slag without rotating the core inner tube.

[0004] The technical solution disclosed in the present invention is as follows:

[0005] A prestressed steel strand core tube capable of crushing rock slag is composed of a steel strand salvage device combination, a core outer tube assembly, and a core inner tube assembly, characterized in that the core inner tube assembly comprises a double-end track-changing threaded core inner tube, a track-changing threaded inner tube joint, and a track-changing threaded retaining spring seat. The track-changing threads on the double-end track-changing threaded core inner tube, the track-changing threaded inner tube joint, and the track-changing threaded retaining spring seat are cross-processed on the core inner tube and the retaining spring seat to form square thread positive buckles and square thread reverse buckles, and the threads at the bottom of the threads are wider than the top of the threads. The spearhead is connected to a recovery tube, and a spring-claw is installed in the recovery tube. One end of the recovery tube is connected to a spring-claw frame, and one end of the spring-claw frame has an adjusting thread connected to the track-changing threaded inner tube joint, which is locked and fixed with a locking bolt. One end of the track-changing threaded inner tube joint is connected to the double-end track-changing threaded core inner tube, and one end of the double-end track-changing threaded core inner tube is further connected to the track-changing threaded retaining spring seat.

[0006] The threaded front end of the track-changing threaded internal pipe joint is processed to limit the position and is locked and fixed with a locking bolt.

[0007] The steel strand salvage device assembly comprises a prestressed steel strand lock, a prestressed steel strand and a salvage device. The prestressed steel strand lock locks the prestressed steel strand and then connects the salvage device. The salvage spear claw on the salvage device clamps the salvage spear head, and the anti-rotation claw is embedded in the anti-rotation groove.

[0008] The core outer tube assembly comprises a centralizer, a reamer 1, a reamer 2 and a core outer tube. The centralizer is connected to a spring-stuck chamber, the spring-stuck chamber is connected to the reamer 1, one end of the reamer is connected to the core outer tube, the other end of the core outer tube is connected to the reamer 2, and one end of the reamer 2 is connected to a drill bit. After the core outer tube is assembled, the core inner tube assembly is installed into the core outer tube, and the spring-stuck chamber is clamped by the spring-stuck claws.

[0009] The advantages of the present invention are as follows: 1. The prestressed steel strand core tube for crushing rock slag adopts the anti-rotation design of the steel strand, the salvage device and the core tube assembly, the anti-rotation design of the spring clamp frame and the inner tube joint connection of the core inner tube assembly and the anti-rotation design of the core inner tube connection thread, so that the prestressed steel strand, the salvage device and the core inner tube are integrated and will not loosen or fall off during forward and reverse rotation; 2. The right-hand rotation of the prestressed steel strand and the forward and right-hand rotation of the drill rod are used to rotate the drill rod to achieve the purpose of crushing the rock slag without rotating the core inner tube; 3. The present invention can crush the rock slag and clean up the accumulated rock powder by rotating the drill rod for 1-2 minutes, which greatly reduces the labor intensity of the operator and the wear of the machine, and increases the economic benefits of the workers and the mine.

[0010] BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 Schematic diagram of the anti-rotation of the strand fishing device and the core tube assembly;

[0011] Figure 2 The anti-rotation structure diagram of the inner spring holder and the inner pipe joint of the core tube assembly;

[0012] Figure 3 Lock bolt cross-section;

[0013] Figure 4 Schematic diagram of track change thread;

[0014] Figure 5 Schematic diagram of the cross section of the core tube assembly;

[0015] In the figure, 1 is prestressed steel strand; 2 is prestressed steel strand lock; 3 is salvage device; 4 is spear claw; 5 is anti-rotation claw; 6 is spear head; 7 is anti-rotation slot; 8 is straightener; 9 is recovery pipe; 10 is ejection card chamber; 11 is ejection card claw; 12 is ejection card frame; 13 is locking bolt; 14 is track change threaded internal pipe joint; 15 is reamer one; 16 is double-end track change threaded core inner pipe; 17 is core outer pipe; 18 is reamer two; 19 is track change threaded retaining spring seat; 20 is retaining spring; 21 is drill bit; 22 is adjustment thread. DETAILED DESCRIPTION

[0016] A crushed rock slag and rock powder core tube assembly installation structure is as follows:

[0017] The prestressed steel strand lock 2 locks the prestressed steel strand 1 and then connects the salvage device 3. The salvage spear claw 4 on the salvage device clamps the salvage spear head 6, and the anti-rotation claw 5 is embedded in the anti-rotation slot 7. The salvage device anti-rotation assembly is completed.

[0018] The core inner tube assembly is connected to the recovery tube 9 by the spearhead 6, and the recovery tube 9 is loaded with an elastic clamp claw 11, and one end of the recovery tube 9 is connected to the elastic clamp frame 12, and one end of the elastic clamp frame 12 is connected to the track-changing threaded inner tube joint 14 with an adjustment thread. The inner tube length is adjusted and locked with a locking bolt 13 to prevent rotation. One end of the track-changing threaded inner tube joint 14 is connected to the double-end track-changing threaded core inner tube 16, and one end of the double-end track-changing threaded core inner tube 16 is connected to the track-changing threaded retaining spring seat 19, and a retaining spring 20 is installed inside the track-changing threaded retaining spring seat 19. The above is the core inner tube assembly.

[0019] The core outer tube is assembled by connecting the centralizer 8 to the ejection card chamber 10, and the ejection card chamber 10 is connected to the reamer 15 to support the core outer tube from rock friction. One end of the reamer 15 is connected to the core outer tube 17, and the other end of the core outer tube 17 is connected to the reamer 2 18. One end of the reamer 2 18 is connected to the drill bit 21. After the core outer tube is assembled, the core inner tube assembly is installed into the core outer tube, and the ejection card chamber 10 is clamped by the ejection claw 11.

[0020] The prestressed steel strand core tube for crushing rock slag adopts the anti-rotation design of the steel strand, salvage device and core tube assembly, the anti-rotation design of the inner spring bracket and inner tube joint connection of the core inner tube assembly, and the anti-rotation design of the inner tube connection thread of the core, so that the prestressed steel strand, salvage device and inner tube of the core are integrated and will not loosen or fall off during forward and reverse rotation:

[0021] 1. Anti-rotation of steel strand, salvage device and core tube assembly:

[0022] When the core inner tube is stuck by rock slag and rock powder, the prestressed steel strand 1 rotates rightward itself, and the drill rod rotates rightward as well. The two rotate in the same direction, and the prestressed steel strand 1 will not become loose or deformed, but will become tight and firm due to the right-hand rotation. One end of the prestressed steel strand 1 is fixed in the steel strand winder and placed on the ground, and the other end is locked by the steel strand lock 2 to the salvage device 3, so that it cannot rotate. The anti-rotation claw 5 of the salvage device is stuck with the anti-rotation slot 7 of the core tube assembly spearhead, so that the core inner tube assembly and the steel strand salvage device cannot rotate. (See Figure 1 )

[0023] 2. The elastic bracket inside the core inner tube assembly and the inner tube joint are connected to prevent rotation:

[0024] The spring-cage holder 12 and the inner tube joint in the core inner tube assembly are connected by threads. The threads are used to adjust the length of the gap between the retaining spring seat at the front end of the core inner tube and the drill bit for water passing. Metric threads can be used to fine-tune the gap, but when rock debris gets stuck, the drill rod rotates forward. If the inner tube joint thread is reversed and turned left, it will loosen and fall off. If the inner tube joint thread is rotated forward and turned right, when the core is drilled normally without breaking, it is clamped by the retaining spring in the retaining spring seat to form a whole. The reverse thread will also loosen and fall off. The original conventional core tube design is to adjust the gap and lock it with double nuts, and it can only be used in one direction. Now we use a positive buckle connection, and process several anti-rotation limit stops at the front end of the inner tube joint thread (see Figure 2 , Figure 3 ) After adjusting the inner tube gap, lock it with bolts to prevent forward and reverse rotation. (A 3-5mm gap must be kept between the front section of the core inner tube retaining ring and the drill bit, and it should be adjusted every time a drill bit is changed)

[0025] 3. Anti-rotation of the thread connection of the core inner tube:

[0026] During normal drilling, the core inner tube is installed with a positive buckle and right-hand rotation. When the rock slag and rock powder get stuck in the core inner tube, the drill rod rotates forward. If the core inner tube and the inner tube joint are connected with a positive buckle, the core inner tube and the drill rod rotate forward at the same time when the rock slag gets stuck, and it is easy to unscrew and fall off. If a reverse thread is used, the drill rod rotates forward, the rock slag gets stuck in the core inner tube, and the reverse thread will not fall off. However, during normal drilling, the core inner tube and the core outer tube rotate right in the same direction, and the core enters the core inner tube. When the core does not leave the rock formation, the retaining spring in the retaining spring seat will hold the core and not rotate, and there will be a reverse force, and the reverse thread will also fall off.

[0027] The track-changing thread of the present invention is cross-processed on the thin-walled core inner tube and the retaining spring seat to form a square thread positive buckle and a square thread reverse buckle (see Figure 4 ) The thread bottom is wide and the thread top is narrow. The thread bottom is wider than the thread top. Due to the left and right rotation angles of the positive and negative threads, the intersection of the thread tracks is just left. If the positive thread is disengaged and the front end is subjected to force, it will automatically change to the reverse thread locking. When the reverse thread is disengaged, it will also change to the positive thread locking.

[0028] When the prestressed steel strand pushes the core inner tube, if rock slag or rock powder gets stuck in the core inner tube, the drill rod will be rotated in the forward direction, and the core inner tube will be changed to the reverse thread and locked. The thread of the core inner tube will not fall off due to the forward rotation of the drill rod and the core outer tube. The core inner tube does not rotate, and the drill rod and the core outer tube rotate, so that the rock slag can be crushed. When removing the change-track thread, use the hand-held female buckle to turn the change-track thread to the forward right or reverse left, and the male and female buckles of the change-track thread can be removed. Based on the above actual conditions, the core tube of the prestressed steel strand of the present invention can crush the rock slag and rock powder when the drill rod and the core outer tube rotate, and the core inner tube does not rotate to crush the rock slag and clean the rock powder, and the core inner tube and the retaining spring seat with the change-track thread will not be disengaged.

Claims

1. A prestressed steel strand core tube capable of crushing rock slag, comprising a steel strand salvage assembly, a core outer tube assembly, and a core inner tube assembly, characterized in that: The core inner tube assembly comprises a double-end track-changing thread core inner tube (16), a track-changing thread inner tube joint (14), and a track-changing thread retaining spring seat (19). The track-changing threads on the double-end track-changing thread core inner tube, the track-changing thread inner tube joint, and the track-changing thread retaining spring seat are cross-processed on the core inner tube, the track-changing thread inner tube joint, and the retaining spring seat to form square threads with positive buckles and square threads with reverse buckles. The threads have a bottom wider than the top of the threads. The spearhead (6) is connected to the recovery tube (9). The recovery tube (9) is internally loaded with a spring-cage claw (11). One end of the recovery tube (9) is connected to a spring-cage frame (12). One end of the spring-cage frame (12) is provided with an adjusting thread (22) connected to the track-changing thread inner tube joint and is locked and fixed with a locking bolt (13). The track-changing thread inner tube joint is connected to the recovery tube (9). One end of the head (14) is connected to a double-end track-changing threaded rock core inner tube (16), and the other end of the double-end track-changing threaded rock core inner tube (16) is connected to a track-changing threaded retaining spring seat (19); the rock core outer tube assembly comprises a centralizer (8), a reamer 1 (15), a reamer 2 (18), and a rock core outer tube (17); the centralizer (8) is connected to a spring-clamping chamber (10), the spring-clamping chamber (10) is connected to the reamer 1 (15), one end of the reamer 1 (15) is connected to the rock core outer tube (17), the other end of the rock core outer tube (17) is connected to the reamer 2 (18), and one end of the reamer 2 (18) is connected to a drill bit (21); after the rock core outer tube assembly is completed, the rock core inner tube assembly is installed in the rock core outer tube, and the spring-clamping claw (11) clamps the spring-clamping chamber (10).

2. The prestressed steel strand core tube capable of crushing rock slag according to claim 1, characterized in that: The threaded front end of the track-changing threaded internal pipe joint is processed with an anti-rotation limiter and is locked and fixed with a locking bolt.

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