One-step forming drilling and chambering tool

Abstract

A broaching blade is rotationally arranged in a containing groove, the back and the cutting edge of the broaching blade are both arranged in the containing groove, when the tool rotates forwards, the diameter of the maximum contour formed by rotation of a drill bit is larger than that of the maximum contour formed by rotation of a tool apron, and the tool rotates backwards so that the broaching blade can be centrifugally thrown out; and the contour diameter formed by rotation of the cutting edges of the thrown-out reaming blades is larger than the maximum contour diameter formed by rotation of the drill bit. One-time forming drilling and reaming can be achieved, the drill rod and the drill bit do not need to be taken back to reinstall the reaming drill bit after drilling is finished, and the workload and the construction time are effectively reduced; according to the invention, reaming at different drilling depths can be realized, the effect of multi-section reaming can also be realized, and high adaptability to different reaming positions is realized; compared with common anchoring, the chambering anchoring can effectively improve the anti-drawing capacity of anchoring of the anchor rod and the anchor cable, and the supporting effect of an anchoring system can be effectively improved under the condition of the same anchoring number.

Description

Technical Field

[0001] The invention relates to a one-time forming drilling and expanding tool. Background Art

[0002] Anchor support technology has been widely promoted and applied in coal mines in my country and has become the main support method for coal mine tunnels. However, in some soft rock tunnels, the anchoring force of ordinary anchoring is lower than that of ordinary tunnels. Therefore, it is necessary to enhance the anchoring effect of the tunnel through hole expansion anchoring. The current problem with hole expansion anchoring is that when expanding the hole after drilling, the drill rod needs to be disassembled and recycled, and then a new hole expansion drill bit needs to be installed, and then the drill rod needs to be reinstalled for hole expansion. The operation process is cumbersome and delays the progress of construction. Especially when drilling and expanding the hole deeper, the longer the time to replace the drill bit, the greater the construction workload. Summary of the invention

[0003] The present invention provides a one-time forming drilling and reaming tool in order to solve the problems existing in the above-mentioned prior art.

[0004] The technical solutions adopted in the present invention are: A one-time forming drilling and reaming tool comprises a drill bit, a tool holder and a reaming blade, wherein the drill bit is fixedly connected to the tool holder, and a receiving groove is provided on the outer wall of the tool holder, wherein the reaming blade is rotatably arranged in the receiving groove, and the back and the cutting edge of the reaming blade are both placed in the receiving groove, and when the tool rotates forward, the maximum contour diameter formed by the rotation of the drill bit is greater than the maximum contour diameter formed by the rotation of the tool holder, and the tool is reversed to allow the reaming blade to be centrifugally thrown out, and after being thrown out, the contour diameter formed by the rotation of the cutting edge of the reaming blade is greater than the maximum contour diameter formed by the rotation of the drill bit.

[0005] Furthermore, the tool holder is a split structure, including an upper tool holder and a lower tool holder, the upper tool holder and the lower tool holder are fixed to each other, the drill bit is fixed to the upper tool holder, and a storage groove is provided on the lower tool holder.

[0006] Furthermore, the upper knife seat is provided with a plurality of protruding inlay ribs, and the lower knife seat is provided with inlay grooves adapted to the inlay ribs, and the inlay ribs and the inlay grooves are fixed by bolts.

[0007] Furthermore, a polygonal hole is provided axially on the upper tool holder, a polygonal shaft matching the polygonal hole is provided on the drill bit, and the polygonal shaft and the polygonal hole are fixed by bolts.

[0008] Furthermore, a rotating hole is provided on the bottom surface of the receiving groove and the lower end surface of the upper knife seat, and a pin is provided on the reaming blade, and the pin is inserted into the rotating hole.

[0009] Furthermore, a polygonal connecting shaft is provided on the lower end surface of the lower knife seat.

[0010] Furthermore, the drill bit and the tool holder are both provided with water injection holes in the axial direction, and the water injection holes penetrate the receiving groove.

[0011] Furthermore, a water injection groove is provided on the blade back of the reaming blade, and when the tool rotates forward and the reaming blade is stored in the storage groove, the water injection groove is connected with the water injection through hole.

[0012] During construction, the present invention can realize the drilling and reaming processes at the same time, and there is no need to replace the drill bit after drilling and then reaming, which saves the steps of taking out all the drill rods and replacing the drill bit, and can realize drilling and reaming with the same set of drilling tools. The advantages generated by this are: it can realize one-time drilling and reaming, and there is no need to retract the drill rod and the drill bit and reinstall the reaming drill bit after drilling, which effectively reduces the workload and construction time; the present invention can realize reaming at different drilling depths, and can also achieve the effect of multi-stage reaming, and has strong adaptability to different reaming positions; compared with ordinary anchoring, reaming anchoring can effectively improve the pull-out resistance of anchor rods and anchor cables, and under the same number of anchors, it can effectively improve the support effect of the anchoring system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a structural diagram of the present invention.

[0014] Figure 2 It is an exploded view of the present invention.

[0015] Figure 3 It is a cross-sectional view of the reaming blade on the tool holder. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] like Figures 1 to 3 The present invention discloses a one-time forming drilling and reaming tool, comprising a drill bit 1, a tool holder 2 and a reaming blade 3. The drill bit 1 is fixedly connected to the tool holder 2. A receiving groove 20 is provided on the outer wall of the tool holder 2. The reaming blade 3 is rotatably arranged in the receiving groove 20, and the back and the cutting edge of the reaming blade 3 are both arranged in the receiving groove 20. When the tool rotates forward, the maximum profile diameter formed by the rotation of the drill bit 1 is greater than the maximum profile diameter formed by the rotation of the tool holder 2. When the tool rotates reversely, the reaming blade 3 is centrifugally thrown out. After being thrown out, the profile diameter formed by the rotation of the cutting edge of the reaming blade 3 is greater than the maximum profile diameter formed by the rotation of the drill bit 1.

[0018] The tool holder 2 in the present invention is a split structure, including an upper tool holder 21 and a lower tool holder 22, the upper tool holder 21 and the lower tool holder 22 are fixed to each other, the drill bit 1 is fixed to the upper tool holder 21, a receiving groove 20 is provided on the lower tool holder 22, the reaming blade 3 is placed in the receiving groove 20, and the upper end is rotatably connected to the upper tool holder 21, and the lower end is rotatably connected to the lower tool holder 22. The split structure of the tool holder 2 can facilitate the loading and unloading of the reaming blade 3.

[0019] In order to ensure the connection reliability between the upper knife seat 21 and the lower knife seat 22, a plurality of protruding inlay ribs 23 are provided on the upper knife seat 21, and an inlay groove 24 adapted to the inlay ribs 23 is provided on the lower knife seat 22, and the inlay ribs 23 and the inlay groove 24 are fixed by bolts. The reliability of the assembly between the upper knife seat 21 and the lower knife seat 22 under high-speed rotation is ensured by the cooperation of the plurality of grooves and ribs.

[0020] In order to ensure the connection reliability between the drill bit 1 and the upper tool holder 21, a polygonal hole 25 is provided in the axial direction of the upper tool holder 21, and a polygonal shaft matching the polygonal hole 25 is provided on the drill bit 1. The polygonal shaft and the polygonal hole 25 are fixed by bolts.

[0021] A rotating hole is provided on the bottom surface of the receiving groove 20 and the lower end surface of the upper knife seat 21, and a pin is provided on the reaming blade 3, and the pin is inserted into the rotating hole. The rotating assembly of the reaming blade 3 is realized by the cooperation between the pin and the rotating hole.

[0022] A polygonal connecting shaft 25 is provided on the lower end surface of the lower tool holder 22, and the connecting shaft 25 is used for assembly with a drilling tool.

[0023] Water injection holes 4 are provided in the axial direction of the drill bit 1 and the tool holder 2. The water injection holes 4 pass through the receiving groove 20, that is, the water injection holes 4 in the receiving groove 20 are in an open state. The water injection holes 4 are used to transport water and air. When drilling, water can be transported to the position of the top drill bit 1 through the water injection holes 4.

[0024] A water injection groove 13 is provided on the blade back of the reaming blade 3 . When the reaming blade 3 is received in the receiving groove 20 during forward rotation of the cutter, the water injection groove 13 is communicated with the water injection through hole 4 .

[0025] When drilling, the reaming blade 3 and the lower tool holder 22 can form a relatively closed condition at the location of the water injection through hole 4, so that water can be transported to the location of the top drill bit 1 through the through hole.

[0026] When the hole is expanded, the expansion blade 3 is opened, and the water in the water injection through hole 4 is thrown out from the receiving groove 20, thereby meeting the condition of water required for expansion.

[0027] according to Figure 1After the reaming tool is assembled, drill at the selected position, stop drilling when the drilling reaches the specified depth, and change the motor of the drilling rig from forward to reverse. Due to the action of centrifugal force, the reaming blade 3 will open and produce friction with the hole wall, and then the reaming blade 3 will be fully unfolded under the combined force. After the reaming is formed, stop pushing and suspend the drilling rig; change the motor of the drilling rig from reverse to forward. Under the action of centrifugal force, the reaming blade 3 will retreat. Pull out all the drill rods to complete the construction of the anchor hole, put the anchoring agent and anchor cable into the hole, and after the anchoring agent is completely cured, install the tray and nut to complete the reaming anchoring.

[0028] The present invention has a good chip removal effect during construction. A through hole is provided in the middle of the whole device and connected with the through hole of the drill rod for conveying water and air. The drilling machine is connected with an air pump or a water pump. When drilling, water or air passes through the hollow drill rod, the lower cutter seat 22, the upper cutter seat 21 and the drill bit 1 in sequence. When reaming, water or air passes through the hollow drill rod, the lower cutter seat 22 and the reaming blade 3 in sequence. Since the shapes of the upper cutter seat 21 and the lower cutter seat 22 are regular hexagons, the shape of the drilled and reamed hole is roughly cylindrical, and there is a large gap between the two, water passes through the construction position and smoothly discharges the drill slag through the gap between the drill and reaming drill bit and the hole wall.

[0029] The above description is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.

Claims

1. A one-step forming drilling and reaming tool, characterized in that: The invention comprises a drill bit (1), a tool holder (2) and a reaming blade (3), wherein the drill bit (1) is fixedly connected to the tool holder (2), a receiving groove (20) is provided on the outer wall of the tool holder (2), the reaming blade (3) is rotatably arranged in the receiving groove (20), and the back and the cutting edge of the reaming blade (3) are both arranged in the receiving groove (20); when the tool rotates forward, the maximum profile diameter formed by the rotation of the drill bit (1) is greater than the maximum profile diameter formed by the rotation of the tool holder (2); when the tool rotates reversely so that the reaming blade (3) is centrifugally thrown out, the profile diameter formed by the cutting edge of the reaming blade (3) after being thrown out is greater than the maximum profile diameter formed by the rotation of the drill bit (1).

2. The one-step forming drilling and reaming tool according to claim 1, characterized in that: The tool holder (2) is a split structure, comprising an upper tool holder (21) and a lower tool holder (22); the upper tool holder (21) and the lower tool holder (22) are fixed to each other, the drill bit (1) is fixed to the upper tool holder (21), and a receiving groove (20) is provided on the lower tool holder (22).

3. The one-step drilling and reaming tool according to claim 2, characterized in that: The upper knife seat (21) is provided with a plurality of protruding inlay ribs (23), and the lower knife seat (22) is provided with inlay grooves (24) adapted to the inlay ribs (23), and the inlay ribs (23) and the inlay grooves (24) are fixed by bolts.

4. The one-step drilling and reaming tool according to claim 2, characterized in that: The upper tool holder (21) is provided with a polygonal hole (25) in the axial direction, and the drill bit (1) is provided with a polygonal shaft matching the polygonal hole (25), and the polygonal shaft and the polygonal hole (25) are fixed by bolts.

5. The one-step drilling and reaming tool according to claim 2, characterized in that: A rotating hole is provided on the bottom surface of the receiving groove (20) and on the lower end surface of the upper blade seat (21), and a pin is provided on the reaming blade (3), and the pin is inserted into the rotating hole.

6. The one-step drilling and reaming tool according to claim 2, characterized in that: A polygonal connecting shaft (25) is provided on the lower end surface of the lower knife seat (22).

7. The one-step drilling and reaming tool according to claim 1, characterized in that: The drill bit (1) and the tool holder (2) are both provided with a water injection through hole (4) in the axial direction, and the water injection through hole (4) passes through the receiving groove (20).

8. The one-step drilling and reaming tool according to claim 1, characterized in that: A water injection groove (13) is provided on the blade back of the reaming blade (3); when the reaming blade (3) is received in the receiving groove (20) during forward rotation of the tool, the water injection groove (13) is connected to the water injection through hole (4).

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