Cutting device of geological drilling hole bottom cutting equipment

Abstract

The utility model relates to a cutting device of geological drilling hole bottom cutting equipment, and belongs to the technical field of geological drilling. According to the technical scheme, a cutting motor is fixed in a rotating shell, a cutting shell is arranged at the bottom of the rotating shell, a tool bit hole is formed in the cylinder wall of the cutting shell, and a tool bit extends out of the tool bit hole of the cutting shell; the cutting motor is connected with the driving shaft through a rotating device, two spiral sliding blocks are arranged on the driving shaft, the spiral sliding blocks are cylinders, a plurality of spiral grooves are formed in the axial section of each spiral sliding block, the two spiral sliding blocks are arranged on the two sides of the tool bits respectively, and the tool bits are arranged between the two spiral sliding blocks. The tool bit can slide along the spiral groove to extend outwards or retract; the cutting motor, the rotating device, the driving shaft, the spiral sliding block, the cutting shell and the tool bit rotate along with the rotating shell. The spiral groove is formed in the spiral sliding block and matched with the sliding shaft of the tool bit, the tool bit is controlled to stretch out and draw back, cutting is stable, and the working efficiency of cutting off a drill rod is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a cutting device of geological drilling hole bottom cutting equipment belongs to geological drilling technical field. BACKGROUND

[0002] In geological drilling, when the drill pipe or casing is stuck in the hole and cannot be pulled out, geological drilling hole bottom cutting equipment is used to cut the drill pipe or casing in the hole, and the remaining pipe material is pulled out to reduce losses. The existing technology of geological drilling hole bottom cutting equipment has many problems in cutting the drill pipe, such as Chinese patent application CN202310787971.4, named "a hole bottom power cutting device for drill pipe in a hole in a rope core drilling accident", which uses a return spring to push out the cutting blade, which is unstable and affects the operation efficiency of cutting the drill pipe. SUMMARY

[0003] The utility model aims at providing a cutting device of geological drilling hole bottom cutting equipment, which sets a spiral groove on the spiral slider and cooperates with the sliding shaft of the cutter head to control the extension and retraction of the cutter head, stabilize the cutting, improve the operation efficiency of cutting the drill pipe, and solve the above technical problems in the background technology.

[0004] The technical scheme of the utility model is as follows:

[0005] A cutting device of geological drilling hole bottom cutting equipment, comprising a rotating module and a hole bottom cutting module, the rotating module comprising a rotating motor, a power distribution slip ring and a rotating shell, the rotating motor being connected with the power distribution slip ring and the rotating shell, the inner and outer rings of the power distribution slip ring being independently rotatable, thereby realizing independent rotation of the rotating shell; the hole bottom cutting module is located below the rotating module and comprises a cutting motor, a rotating device, a drive shaft, a spiral slider, a cutting shell and a cutter head, the cutting motor being fixed in the rotating shell, the bottom of the rotating shell being provided with the cutting shell, the barrel wall of the cutting shell being provided with a cutter head hole, and the cutter head extending out of the cutter head hole of the cutting shell; the cutting motor is connected with the drive shaft through the rotating device, two spiral sliders are arranged on the drive shaft, the spiral sliders are cylindrical, a plurality of spiral grooves are arranged on the axial section of the spiral sliders, and the spiral grooves are Archimedes spiral grooves; the two spiral sliders are arranged on the two sides of the cutter head respectively, a plurality of cutter heads are arranged between the two spiral sliders, and the number of cutter heads matches the number of spiral grooves; the cutter head is composed of a cutter body and a sliding shaft, the two sides of the cutter body are respectively provided with the sliding shaft, the sliding shafts on the two sides of each cutter head respectively match the spiral grooves at the same position of the two spiral sliders, and the cutter head can slide along the spiral grooves to extend outward or retract; the cutting motor, the rotating device, the drive shaft, the spiral slider, the cutting shell and the cutter head rotate with the rotating shell.

[0006] Further, the spiral slider is arranged with three spiral grooves on the axial section, and three cutter heads are arranged between the two spiral sliders.

[0007] Further, the two spiral sliders are provided with driving shaft holes, and the driving shaft passes through the driving shaft holes to be connected with the two spiral sliders.

[0008] Further, the driving shaft holes of the two spiral sliders are provided with key grooves at the same position, and the two key grooves are matched with the same mounting key on the driving shaft to ensure that the spiral grooves on the two spiral sliders correspond to each other.

[0009] Further, the upper end of the cutter head is a cuboid cutter body, the top end of which is provided with a cutting edge, and the lower end of the cuboid is provided with a sliding shaft which is matched with the spiral groove to slide and control the length of the cutter body extending out of the cutter head hole of the cutting shell.

[0010] Further, the cutting edge of the cutter head is alloy or diamond.

[0011] Further, the spiral groove has a small starting radius and a large ending radius, when the spiral slider rotates, the sliding shaft of the cutter head slides from the starting point to the ending point of the spiral groove, and the cutter head also extends from the low point to the high point, thereby completing the cutting of the drill pipe wall.

[0012] The utility model is conveyed to the cutting position in the drill pipe, the rotating shell of the rotating module rotates, the cutting motor rotates simultaneously, the cutting motor drives the driving shaft to rotate, drives the spiral slider to rotate, pushes the cutter head from the low end to the high end of the spiral groove, the cutter head gradually extends outward, until the cutting starts by contacting the inner wall of the drill pipe, the power of the rotating cutting is provided by the rotating motor driving the rotating shell to rotate; after the cutting is completed, the utility model is taken out.

[0013] The utility model has the advantages that the spiral groove is arranged on the spiral slider and matched with the sliding shaft of the cutter head, the extension of the cutter head is controlled, the cutting is stable, and the operation efficiency of cutting the drill pipe is improved. DRAWINGS

[0014] Figure 1 It is the rotating module schematic view of the utility model embodiment;

[0015] Figure 2 It is the hole bottom cutting module original state schematic view of the utility model embodiment;

[0016] Figure 3 It is the hole bottom cutting module cutting state schematic view of the utility model embodiment;

[0017] Figure 4 It is the spiral slider schematic view of the utility model embodiment;

[0018] Figure 5 It is the cutter head schematic view of the utility model embodiment;

[0019] Figure 6 It is the cutting shell schematic view of the utility model embodiment;

[0020] Figure: drill pipe 15, rotating motor 16, power distribution slip ring 17, rotating housing 18, cutting motor 19, rotating device 20, drive shaft 21, helical slide 22, cutting housing 23, cutter head 24, cutter body 26, sliding shaft 27, helical groove 28, drive shaft hole 29, keyway 30, cutter head hole 31. DETAILED DESCRIPTION

[0021] The utility model is further described by examples in combination with the drawings.

[0022] Referring to the drawings Figures 1-5 , the embodiment provides a cutting device of geological drilling hole bottom cutting equipment, containing rotating module and hole bottom cutting module, the rotating module contains rotating motor 16, power distribution slip ring 17 and rotating housing 18, and rotating motor 16 is connected through power distribution slip ring 17 and rotating housing 18, the power distribution slip ring 17 is the device that inner and outer rings can rotate independently, is used for the connection of signal line and the overall up and down separation of cutting device, realizes the independent rotation of rotating housing 18;The hole bottom cutting module is located below the rotating module, contains cutting motor 19, rotating device 20, drive shaft 21, helical slide 22, cutting housing 23 and cutter head 24, and cutting motor 19 is fixed in rotating housing 18, and the bottom of rotating housing 18 is equipped with cutting housing 23, and the barrel wall of cutting housing 23 is equipped with cutter head hole 31, and cutter head 24 extends from cutter head hole 31 of cutting housing 23;The cutting motor 19 is connected with drive shaft 21 through rotating device 20, and two helical slides 22 are arranged on drive shaft 21, and helical slide 22 is cylindrical, and a plurality of helical grooves 28 are arranged on the axial section of helical slide 22, and the helical groove 28 is Archimedes spiral groove;Two the helical slide 22 is arranged at the two sides of cutter head 24 respectively, and a plurality of cutter heads 24 are arranged between two helical slides 22, and the number of cutter heads 24 is matched with the number of helical grooves 28;The cutter head 24 is composed of cutter body 26 and sliding shaft 27, and sliding shaft 27 is arranged at the two sides of cutter body 26 respectively, and the sliding shaft 27 of each cutter head two sides respectively matches the helical groove 28 of the same position of two helical slides 22, and cutter head 24 can slide outward and retract along helical groove 28;Cutting motor 19, rotating device 20, drive shaft 21, helical slide 22, cutting housing 23 and cutter head 24 rotate with rotating housing 18.

[0023] Referring to the drawings Figure 4 , the helical slide 22 is arranged with three helical grooves 28 on the axial section, and three cutter heads 24 are arranged between two helical slides 22.

[0024] Referring to the drawings Figure 4 , two the helical slide 22 center is equipped with drive shaft hole 29, and drive shaft 21 is connected with two helical slides 22 through drive shaft hole 29.

[0025] Referring to the drawings Figure 4 The driving shaft holes 29 of the two spiral sliders 22 are provided with key grooves 30 at the same position, and the two key grooves 30 are matched with the same mounting key on the driving shaft 21, so as to ensure that the spiral grooves on the two spiral sliders 22 correspond to each other.

[0026] Referring to the drawings Figure 5 The upper end of the cutter head 24 is a cuboid cutter body 26, the top end of which is provided with a cutting edge, and the lower end of the cuboid is provided with a sliding shaft 27 which is matched with the spiral groove 28 for sliding and controlling the length of the cutter body 26 extending out of the cutter head hole 31 of the cutting shell 23.

[0027] Preferably, the cutting edge of the cutter head 24 is alloy or diamond.

[0028] In this embodiment, the spiral groove 28 has a small starting radius and a large ending radius, when the spiral slider rotates, the sliding shaft 27 of the cutter head 24 slides from the starting point to the ending point of the spiral groove 28, and the cutter head 24 also extends from the low point to the high point, thereby completing the cutting of the pipe wall of the drill rod.

[0029] The utility model is conveyed to the corresponding cutting position in the drill rod 15, the rotating shell 18 of the rotating module is rotated, the cutting motor 19 is also rotated, the cutting motor 19 drives the driving shaft 21 to rotate, drives the spiral slider 22 to rotate, pushes the cutter head 24 from the low end to the high end of the spiral groove 28, the cutter head 24 gradually extends outward until it contacts the inner wall of the drill rod 15 to start cutting, the power of the rotating cutting is provided by the rotating motor 16 driving the rotating shell 18 to rotate, and the utility model is taken out after cutting is completed.

[0030] In this embodiment, the low-speed rotating speed of the cutter head 24 is 70-100 rpm, and the high-speed rotating speed is 400-500 rpm.

[0031] The spiral groove 28 has a small starting radius and a large ending radius, when the spiral slider rotates, the sliding shaft 27 of the cutter head 24 slides from the starting point to the ending point of the spiral groove 28, and the cutter head 24 also extends from the low point to the high point, thereby completing the cutting of the pipe wall of the drill rod.

[0032] In this embodiment, the rotating device 20 comprises a bearing and a shaft, which is a commonly used rotating mechanism in the art.

[0033] In this embodiment, the rotating motor 16 and the cutting motor 19 are DC motors.

[0034] In the embodiment, the hole bottom cutting device has three kinds according to different cutting pipe diameters, which are 71mm, 89mm and 114mm three kinds of diameters, the 71mm diameter can cut the range of 70-73mm, the 89mm diameter can cut the range of 89-91mm, and the 114mm diameter can cut the range of 110-114mm.

[0035] The power distribution slip ring is a slip ring mechanism known in the art, also called a rotary electrical interface or electrical rotary joint.

[0036] In the embodiment, the specific work flow is as follows:

[0037] The rotary motor 16 rotates along the cutting direction of the cutter head 24, and initially rotates at a low speed to rotate the rotating shell 18; at this time, the cutting motor 19 also works, the cutting motor 19 drives the driving shaft 21 to rotate, the driving helical slide block 22 rotates, the helical slide block 22 pushes the cutter head 24 from the low end to the high end of the helical groove 28, the cutter head 24 gradually extends outward, and the cutter head 24 contacts the inner wall of the drill pipe 15 to start cutting.

[0038] Because the self-locking ability of the helical slide block 22 itself is weak, there may be pits or scale on the inner wall of the drill pipe 15, or the cutting position is not a standard circle, which will generate an inward force on the cutter head 24, and the cutter head 24 will shrink while protecting the cutter head 24, in order to maintain the extension size of the cutter head, the cutting motor 19 starts to work intermittently, and the cutter head shrinks under force, and the rotary motor 16 starts to push the cutter head out again.

[0039] The rotary motor 16 keeps rotating at a low speed to drive the hole bottom cutting module to cut the drill pipe 15 intermittently until the cutting position is cut into a complete circle, and the cutting motor 19 no longer works intermittently. The rotary motor 16 starts to rotate at a high speed to push the cutter head 24 out until the drill pipe 15 is cut off.

[0040] At this time, the rotary motor 16 cannot stop and must continue to rotate at a high speed, and the cutting motor 19 starts to rotate in reverse to gradually recover the extended cutter head 24 to the original state, and then the cutting motor 19 stops working. It should be noted that the rotary motor 16 must be kept rotating at a high speed at this time, because the drill pipe 15 will produce a certain displacement and displacement when it is cut off, and the rotary motor 16 may be stuck if it stops rotating.

[0041] After the rotary motor 16 stops rotating, the utility model is taken out of the wellhead, and the cutting is completed.

Claims

1. A cutting device for a geological drilling hole bottom cutting apparatus, characterized by: The application relates to a rotary cutting device, which comprises a rotary module and a hole bottom cutting module, the rotary module comprises a rotary motor (16), a power distribution slip ring (17) and a rotary shell (18), the rotary motor (16) is connected through the power distribution slip ring (17) and the rotary shell (18), the inner and outer rings of the power distribution slip ring (17) can rotate independently, thereby realizing independent rotation of the rotary shell (18); the hole bottom cutting module is located below the rotary module and comprises a cutting motor (19), a rotating device (20), a driving shaft (21), a spiral sliding block (22), a cutting shell (23) and a cutter head (24), the cutting motor (19) is fixed in the rotary shell (18), the bottom of the rotary shell (18) is provided with the cutting shell (23), a cutter head hole (31) is arranged on the cylinder wall of the cutting shell (23), and the cutter head (24) extends out of the cutter head hole (31) of the cutting shell (23); the cutting motor (19) is connected with the driving shaft (21) through the rotating device (20), two spiral sliding blocks (22) are arranged on the driving shaft (21), the spiral sliding blocks (22) are cylindrical bodies, a plurality of spiral grooves (28) are arranged on the axial section of the spiral sliding blocks (22), and the spiral grooves (28) are Archimedes spiral grooves; the two spiral sliding blocks (22) are arranged on the two sides of the cutter head (24) respectively, a plurality of cutter heads (24) are arranged between the two spiral sliding blocks (22), the number of the cutter heads (24) matches the number of the spiral grooves (28); the cutter head (24) is composed of a cutter body (26) and a sliding shaft (27), the two sides of the cutter body (26) are respectively provided with the sliding shaft (27), the sliding shaft (27) on each side of the cutter head matches the spiral groove (28) at the same position of the two spiral sliding blocks (22) respectively, and the cutter head (24) can slide along the spiral groove (28) to extend outwards or retract; the cutting motor (19), the rotating device (20), the driving shaft (21), the spiral sliding block (22), the cutting shell (23) and the cutter head (24) rotate together with the rotary shell (18).

2. A cutting apparatus for a geological drilling hole bottom cutting device according to claim 1, characterized in that: Three spiral grooves (28) are arranged on the axial section of the spiral sliding block (22), and three cutter heads (24) are arranged between the two spiral sliding blocks (22).

3. A cutting apparatus for a geological drilling hole bottom cutting device according to claim 1 or 2, characterised in that: Driving shaft holes (29) are arranged at the centers of the two spiral sliding blocks (22), and the driving shaft (21) is connected with the two spiral sliding blocks (22) through the driving shaft holes (29).

4. A cutting apparatus for a geological drilling hole bottom cutting device according to claim 3, characterized in that: Key grooves (30) are arranged at the same positions of the driving shaft holes (29) of the two spiral sliding blocks (22), the two key grooves (30) are matched with the same mounting key on the driving shaft (21), and the spiral grooves on the two spiral sliding blocks (22) correspond to each other.

5. A cutting apparatus for a geological drilling hole bottom cutting device according to claim 1 or 2, characterized in that: The upper end of the cutter head (24) is a cutter body (26) in the shape of a cuboid, a cutting edge is arranged at the top end, a sliding shaft (27) is arranged at the lower end of the cuboid, the sliding shaft (27) is matched with the spiral groove (28) to slide, and the length of the cutter body (26) extending out of the cutter head hole (31) of the cutting shell (23) is controlled.

6. A cutting apparatus for a geological drilling hole bottom cutting device according to claim 5, characterized in that: The starting radius of the spiral groove (28) is small, and the terminal radius is large.

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