Following up on the reamer bit and rotary excavator

Abstract

The application provides a follow-up reaming drill bit and a rotary excavator. The follow-up reaming drill bit comprises a base body and a plurality of chip removal drill bits. The base body is used to be connected with a drill rod and to rotate by itself under the driving of the drill rod. The plurality of chip removal drill bits are movably connected with the base body. The plurality of chip removal drill bits are arranged on a circumference with a center on the rotation axis of the base body. Each chip removal drill bit can extend out of the area surrounded by the outer contour of the normal projection of the base body on the extension direction of the rotation axis when moving relative to the base body. The drill bit can realize drilling reaming, and the reaming depth is not limited to the height of the drill bit, the reaming depth is adjustable, and the use is flexible and convenient. Especially, the drilling reaming can be performed in a rock layer, so as to provide sufficient space for the hole section of the casing extending into the rock layer.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of drilling technology, in particular, to a follow-up reaming drill bit and rotary excavator. BACKGROUND

[0002] The rotary drilling rig is a comprehensive drilling rig, which has at least the characteristics of fast hole-forming speed, small pollution and strong mobility. At present, the short spiral drill bit rotary drilling rig can perform dry excavation operation, and the rotary drill bit rotary drilling rig can perform wet excavation operation under the premise of having a mud wall. At the same time, the rotary drilling rig can cooperate with the percussion hammer to drill hard strata and then perform hole excavation operation. In addition, during the operation of the rotary drilling rig, when the hole diameters are different, a small-diameter drill bit is first used to drill an initial hole, and then a reaming drill bit is used to further perform reaming operation at the depth position where reaming is required. Moreover, the existing reaming stratum is generally a soil layer, and reaming operation cannot be performed in a rock layer.

[0003] The inventor has found that the existing rotary reaming machine has the following shortcomings:

[0004] The process is complicated, the efficiency is low, and the depth of reaming is inconvenient to adjust. SUMMARY

[0005] The purpose of the present application is to provide a follow-up reaming drill bit and rotary excavator, which can simplify the reaming process, shorten the construction period, improve the operation efficiency, and flexibly and conveniently select the depth of reaming.

[0006] The embodiments of the present application are implemented as follows:

[0007] In a first aspect, the present application provides a follow-up reaming drill bit, comprising:

[0008] a base body for connecting with a drill rod;

[0009] and a plurality of chip removal drill bits, each of which is movably connected with the base body, and the plurality of chip removal drill bits are arranged at intervals on a circumference with a center on an axis of self-rotation of the base body; each of the chip removal drill bits can extend out of an area surrounded by an outer contour of a normal projection of the base body in an extension direction of the axis of self-rotation when moving relative to the base body.

[0010] In an optional embodiment, the chip removal drill bit is rotatably connected with the base body.

[0011] In an optional embodiment, the base body comprises a bearing cylinder and a plurality of mounting blocks, the bearing cylinder is open at one end, the plurality of mounting blocks are connected with the bearing cylinder and are arranged in a circumferential direction of the bearing cylinder, the plurality of chip removal drill bits are rotatably connected with the plurality of mounting blocks one by one, each chip removal drill bit can extend out of the bearing cylinder from the open end when rotating relative to the base body, and the bearing cylinder is used to be connected with the drill rod.

[0012] In an optional embodiment, the mounting block comprises a base and two mounting plates, the base is fixedly connected with the bearing cylinder, the two mounting plates are fixedly connected with the base and are oppositely arranged, and the chip removal drill bit is arranged between the two mounting plates and is rotatably connected with the two mounting plates.

[0013] In an optional embodiment, the chip removal drill bit is provided with a guide slope, the guide slope has an included angle with the rotation axis of the base body, and the guide slope is used to make the chip removal drill bit have a rotating trend of extending out of the region under the action of an external force.

[0014] In an optional embodiment, the chip removal drill bit comprises a mounting body and a chip body, the mounting body is movably connected with the base body, the chip body is connected with the mounting body, and the hardness of the chip body is greater than that of the mounting body; the chip body is used to extend out of the region when the chip removal drill bit moves relative to the base body.

[0015] In an optional embodiment, the mounting body and the chip body are detachably connected.

[0016] In an optional embodiment, the base body is provided with a slot, and the slot is used for plug-in mounting of the drill rod.

[0017] In an optional embodiment, the base body is provided with a limiting portion, the limiting portion is used to abut against the chip removal drill bit in the process of extending out of the region, so as to limit the movement of the chip removal drill bit relative to the base body in the direction of extending out of the region.

[0018] In a second aspect, the application provides a rotary digging machine, which comprises:

[0019] The follow-up reaming drill bit according to any one of the preceding embodiments.

[0020] The beneficial effects of the embodiments of the application are as follows:

[0021] In summary, the follow-up reaming drill bit provided by the embodiment is used as follows: firstly, a normal drill bit is used to drill a hole, when the hole is drilled to a depth at which reaming is required, the follow-up reaming drill bit is placed into the initial hole and abuts against the hole bottom wall of the initial hole, then the plurality of chip removal drill bits are expanded outward, i.e. the plurality of chip removal drill bits are moved relative to the base body to extend out of the base body and are embedded into the hole wall of the initial hole, in this way, the area surrounded by the outer edges of the chip removal drill bits is larger than the hole diameter of the initial hole, then torque is transmitted to the base body by using a drill rod, the base body drives the plurality of chip removal drill bits to rotate around the rotation axis of the base body, the plurality of chip removal drill bits cooperate to perform drilling, and the drilled hole has a hole diameter larger than that of the initial hole. During drilling, pressure is applied to the base body, the entire follow-up reaming drill bit can move in a set direction, and the moving distance is determined by the reaming depth. That is, the follow-up reaming drill bit can move in the depth direction of the hole while reaming, thereby meeting the reaming requirements at different depths and having a wide range of applications. Moreover, drilling and reaming are performed synchronously by the follow-up reaming drill bit, and it is not necessary to drill a small-diameter hole in the hole section to be reamed in advance, thereby saving the drilling process, shortening the drilling period, and improving the drilling efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0023] Figure 1 A perspective view of the follow-up reaming drill bit of the embodiment of the present application;

[0024] Figure 2 A partial cross-sectional view of the follow-up reaming drill bit of the embodiment of the present application;

[0025] Figure 3 Another perspective view of the follow-up reaming drill bit of the embodiment of the present application;

[0026] Figure 4 Still another perspective view of the follow-up reaming drill bit of the embodiment of the present application;

[0027] Figure 5 A structure diagram of the chip removal drill bit being opened.

[0028] FIG.

[0029] 100 - base; 110 - bearing cylinder; 111 - position limiting part; 120 - cover plate; 130 - connecting cylinder; 140 - mounting block; 150 - reinforcing plate; 160 - annular fixing plate; 200 - chip drill; 210 - mounting body; 220 - rotating shaft; 230 - chip body. DETAILED DESCRIPTION

[0030] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0032] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0033] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0034] In addition, the terms "horizontal", "vertical" and the like do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0035] In the description of the present application, it is also necessary to point out that, unless otherwise explicitly specified and limited, the terms "arrange", "mount", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] At present, in the drilling process, especially in the soil layer drilling, in order to provide a certain supporting force, it is necessary to enlarge the part of the hole diameter of the soil layer, that is, to enlarge the hole diameter at the set depth of the completed drilling. When operating, the reaming device is deepened into the drilling hole, and after reaching the set position, the reaming operation is carried out, and the depth of the reaming section is determined according to the height of the reaming device itself, and the drilling reaming cannot be carried out. At the same time, in the prior art, reaming cannot be carried out in the rock layer, and drilling reaming cannot be carried out.

[0037] In view of this, the designer designs a follow-up reaming bit, which can realize drilling reaming, and the depth of reaming can not be limited to the height of the bit itself, the reaming depth is adjustable, and the use is flexible and convenient. Especially, drilling reaming can be carried out in the rock layer, so as to provide enough space for the hole section of the casing extending into the rock layer.

[0038] Please refer to Figures 1-5 In the embodiment, the follow-up reaming bit comprises a base body 100 and a plurality of chip removal bits 200. The base body 100 is used to be connected with a drill rod and is used to rotate under the driving of the drill rod. The plurality of chip removal bits 200 are movably connected with the base body 100. The plurality of chip removal bits 200 are arranged on the circumference of a circle with the center on the line of the rotation axis 220 of the base body 100; each chip removal bit 200 can extend out of the area surrounded by the outer contour of the orthographic projection of the base body 100 in the extension direction of the line of the rotation axis 220 when moving relative to the base body 100.

[0039] Please combine Figure 2 and Figure 5The follow-up reaming drill bit provided by the embodiment can provide sufficient torque and pressure, so that reaming drilling operation can be performed in the rock layer, and the reaming depth is controllable.

[0040] The follow-up reaming drill bit provided by the embodiment can provide sufficient torque and pressure, so that reaming drilling operation can be performed in the rock layer, and the reaming depth is controllable.

[0041] In the embodiment, the base body 100 can include a bearing cylinder 110, a sealing plate 120, a connecting cylinder 130, and a plurality of mounting blocks 140. The bearing cylinder 110 is in a cylindrical shape, one end of the bearing cylinder 110 is open, and the other end is provided with the sealing plate 120. The connecting cylinder 130 is arranged on the sealing plate 120, the connecting cylinder 130 is a regular polygonal cylinder, the outer cylinder wall of the connecting cylinder 130 is fixedly connected with the sealing plate 120 through the reinforcing plates 150, and the reinforcing plates 150 are arranged in the shape of right-angled triangular plates. The number of the reinforcing plates 150 is plural, and the plurality of reinforcing plates 150 are uniformly and spacedly arranged in the circumferential direction of the connecting cylinder 130. The connecting cylinder 130 is used for inserting and connecting with the drill rod. Since the connecting cylinder 130 is a regular polygonal cylinder, the cylinder cavity of the connecting cylinder 130 is a regular polygon, and the cylinder cavity can be inserted and connected with the drill rod, so that the drill rod and the connecting cylinder 130 cannot rotate relative to each other, and the torque can be conveniently transmitted. For example, the connecting cylinder 130 is a regular hexagonal cylinder. It should be understood that the cylinder cavity of the connecting cylinder 130 can also be referred to as a slot.

[0042] It should be understood that the bearing cylinder 110, the sealing plate 120, the connecting cylinder 130, and the reinforcing plates 150 can be fixed by welding.

[0043] Optionally, a plurality of mounting blocks 140 are arranged at the open end of the bearing cylinder 110, and the plurality of mounting blocks 140 are arranged uniformly in the circumferential direction of the bearing cylinder 110. Each mounting block 140 comprises a base and two mounting plates. Further, the open end of the bearing cylinder 110 is provided with an annular fixing plate 160, the annular fixing plate 160 is a circular plate, the annular fixing plate 160 is coaxially arranged with the bearing cylinder 110, the base is fixedly connected to the side of the annular fixing plate 160 away from the sealing plate 120, the two mounting plates are fixedly connected to the base and oppositely arranged, the chip drill bit 200 is arranged between the two mounting plates and rotatably connected to the two mounting plates. For example, the base can be welded on the annular fixing plate 160, or the base is fixed on the annular fixing plate 160 by bolts. Further, each mounting plate is provided with a mounting hole, the mounting hole is a circular hole, the two mounting holes on the two mounting plates are coaxially arranged, and the central axis of the connecting line of the two mounting holes passes through the axis of the bearing cylinder 110, that is, the axis of the mounting hole extends along the tangent direction of the bearing cylinder 110.

[0044] It should be noted that the plurality of mounting blocks 140 on the annular fixing plate 160 can be arranged in multiple circles, each circle of mounting blocks 140 is located on the same circumference, and the plurality of mounting blocks 140 have a spacing in the radial direction of the bearing cylinder 110, so that the drilling capacity is stronger.

[0045] In the embodiment, each installation block 140 is rotatably connected with a chip drill 200. Specifically, each chip drill includes an installation body 210 and a chip body 230, and the installation body 210 is connected with the chip body 230. The installation body 210 is provided with a rotating shaft 220, which is inserted into the installation holes of the two installation plates of the same installation block 140. The chip drill 200 is provided in a split structure, which is convenient for machining. The hardness of the chip body 230 is greater than that of the installation body 210. The chip body 230 directly contacts with the stratum, and thus requires higher strength and a more complex environment, and needs to be made of a material with stronger performance. The installation body 210 is only used for transmitting torque, and thus the material cost of the installation body 210 is lower than that of the chip body 230, thereby reducing the cost. Further, the installation body 210 and the chip body 230 are detachably connected. When the chip body 230 needs to be replaced due to damage, a new chip body 230 can be installed on the installation body 210. After the chip body 230 contacts with the stratum, the chip body 230 can be extended out of the area when moving relative to the base body 100 by applying an external force to the bearing cylinder 110, thereby realizing the reaming operation. For example, in the embodiment, the chip body 230 is rotatably connected with the installation body 210, and the rotating axis is perpendicular to the axis of the installation hole. In this way, the chip body 230 can rotate when performing the chip action, thereby avoiding being stuck and reducing the failure rate. Meanwhile, the chip body 230 is provided in a circular truncated cone shape, that is, the chip body 230 and the installation body 210 are rotatably matched around the axis of the chip body 230, and the outer circumferential surface of the chip body 230 is a guide inclined surface.

[0046] It should be noted that the normal working state of the follow-up reamer is basically vertically arranged, that is, the direction of drilling is vertical. When the follow-up reamer is in the normal working state, the cutting chip 230 has a tendency to rotate from the outside to the inside under the action of gravity, so that the cutting chip 230 is outside the area surrounded by the outer contour of the normal projection of the cutting chip 230 on the extension direction of the rotation axis 220 line of the bearing cylinder 110. In this way, the follow-up reamer can easily enter the drill hole and reach the bottom of the drill hole. When the cutting chip head contacts the bottom wall of the drill hole, an external force is applied to the base body 100 along the rotation axis 220 line, in order to ensure that the cutting chip head can rotate from the inside to the outside and extend out of the bearing cylinder 110. A guide slope is arranged on the side of the cutting chip head away from the sealing plate 120. In other words, when the follow-up reamer is in the normal working state, the guide slope has an angle with the rotation axis 220 line, and the side of the guide slope close to the sealing plate 120 is closer to the rotation axis 220 line than the side away from the sealing plate 120. In this way, when the cutting chip 230 contacts the bottom wall of the drill hole, the guide slope actually contacts the bottom wall, and the pressure is applied to the bearing cylinder 110 from the hole mouth to the bottom of the drill hole, and the bearing cylinder 110 transmits the pressure to the cutting chip 230, so that each cutting chip 230 can rotate from the inside to the outside relative to the bearing cylinder 110 under the action of the guide slope, thereby extending out of the bearing cylinder 110 and being inserted into the hole wall. When the torque is transmitted to the cutting chip 230 through the bearing cylinder 110, the cutting chip 230 can perform reaming operation, and when the pressure is applied to the bearing cylinder 110, the cutting chip 230 can continue to advance along the drill hole depth to realize follow-up reaming.

[0047] In addition, it should be noted that the guide slope is provided with a tooth groove, thereby facilitating the drilling operation.

[0048] When the mounting block 140 is arranged in multiple circles, a circle of cutting chips 230 is correspondingly arranged on each circle of mounting blocks 140, and the radius of reaming is determined by the distance of the cutting chip 230 of the outermost circle extending out of the bearing cylinder 110. The cutting chips 230 inside the outermost circle are mainly used for breaking rocks to complete the drilling operation. It should be understood that the core function of the follow-up reamer is to drill and ream, and the obtained hole can be an annular hole, and the middle core can be taken out through a coring process to obtain a complete hole. Obviously, when the radius of reaming is large, the follow-up reamer can use multiple reaming operations to finally obtain a hole with a required diameter. In some scenarios, the follow-up reamer can perform one reaming operation to obtain a hole with a required diameter.

[0049] In the embodiment, the bearing cylinder 110 is provided with a limiting part 111. The limiting part 111 is used to abut against the chip drill bit 200 during the process of rotating the chip drill bit 200 from inside to outside to extend out of the extending area, so as to limit the rotation of the chip drill bit 200 relative to the bearing cylinder 110 in the direction of extending out of the extending area, thereby controlling the maximum rotation angle of the chip drill bit 200. By providing the limiting part 111, it can be ensured that the chip 230 is always in effective contact with the hole bottom wall, and the situation that the chip 230 is excessively rotated to cause the contact force with the hole bottom wall to be weakened is not prone to occur, and the situation that the chip 230 is stuck is not prone to occur, so that the failure rate is low, and the operation is safe and reliable.

[0050] It should be understood that the limiting part 111 can be the edge of the open end of the bearing cylinder 110, and the edge can only limit the rotation range of the chip 230 located in the outermost circle, and when the rotation range of the chip 230 in the outermost circle is limited, the rotation range of the remaining chips 230 is naturally limited.

[0051] It should be understood that the chip drill bit 200 can be divided into two categories, one type of drill bit is used for drilling and reaming, and the other type of drill bit is used for cutting the formation to realize drilling, and does not have the function of reaming. The reaming type drill bit can be rotated outward to extend out of the bearing cylinder 110 and be inserted into the hole wall to realize reaming. The drill bit that does not need to be reamed can be set as a rotating type or a fixed type.

[0052] In other embodiments, the chip drill bit 200 for reaming can realize the function of extending out of the bearing cylinder 110 in the form of sliding.

[0053] The follow-up reaming drill bit provided in the embodiment can drill in the hole depth direction while reaming, so as to obtain a reaming section with a set depth according to needs, and the construction is convenient and flexible, and the use range is wide. At the same time, the follow-up reaming drill bit can drill and ream in the rock layer, and has powerful functions.

[0054] The embodiment further provides a rotary drilling machine, which comprises a power box, a drill rod and the follow-up reaming drill bit mentioned in the above embodiment. The power box is connected with the drill rod to provide torque for the drill rod. The drill rod is inserted into the connecting cylinder 130 to transmit the torque and the pressurizing force to the bearing cylinder 110 and the chip drill bit 200. The rotary drilling machine can perform drilling and reaming operation, and has flexible construction, high efficiency and high hole forming quality.

[0055] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A follow-up reaming head, characterized in that, The application relates to a follow-up reamer bit. The follow-up reamer bit comprises a base body for connecting with a drill rod, and a plurality of chip removal bits movably connected with the base body, the chip removal bits being arranged on a circumference with a center on an axis of rotation of the base body, each chip removal bit being capable of extending out of an area surrounded by an outer contour of a projection of the base body on an extension direction of the axis of rotation when the chip removal bit moves relative to the base body. The chip removal bit is rotatably connected with the base body. The chip removal bit comprises a mounting body movably connected with the base body and a chip removal body connected with the mounting body, the chip removal body having a hardness greater than that of the mounting body, the chip removal body being used to extend out of the area when the chip removal bit moves relative to the base body. The chip removal body is provided in a circular truncated cone shape, the chip removal body is rotatably connected with the mounting body around an axis of the chip removal body, an outer periphery of the chip removal body is a guide slope, the guide slope has an angle with the axis of rotation of the base body, a side of the guide slope close to a sealing plate is closer to the axis of rotation than a side of the guide slope away from the sealing plate, and the guide slope is used to make the chip removal bit have a rotating trend of extending out of the area under the action of an external force. A limiting part is arranged on the bearing cylinder, the limiting part is used to abut against the chip removal bit during the rotation of the chip removal bit outwards to extend out of the area, so as to limit the rotation of the chip removal bit relative to the bearing cylinder in the direction of extending out of the area, thereby controlling the maximum rotating angle of the chip removal bit.

2. The follow-up reamer bit according to claim 1, wherein: the base body comprises a bearing cylinder with an open end and a plurality of mounting blocks, the mounting blocks are arranged on a circumference of the bearing cylinder and connected with the bearing cylinder, and each chip removal bit is rotatably connected with a corresponding mounting block, and each chip removal bit is capable of extending out of the bearing cylinder from the open end when the chip removal bit rotates relative to the base body. the bearing cylinder is used to connect with the drill rod.

3. The follow-up reamer bit according to claim 2, wherein: each mounting block comprises a base and two mounting plates, the base is fixedly connected with the bearing cylinder, the two mounting plates are fixedly connected with the base and oppositely arranged, and the chip removal bit is arranged between the two mounting plates and rotatably connected with the two mounting plates.

4. The follow-up reamer bit according to claim 1, wherein: the mounting body is detachably connected with the chip removal body.

5. The follow-up reamer bit according to claim 1, wherein: a slot is arranged on the base body, and the slot is used to insert and fix the drill rod.

6. The follow-up reamer bit according to claim 1, wherein: a limiting part is arranged on the base body, and the limiting part is used to abut against the chip removal bit during the extension of the chip removal bit out of the area, so as to limit the movement of the chip removal bit relative to the base body in the direction of extending out of the area. The rotary digging machine comprises:

7. A rotary excavator characterized by comprising: the follow-up reamer bit according to any one of claims 1-6. ​

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