A reamer for directional long hole drilling in coal seams

Abstract

The present application belongs to the field of coal mine drilling, and particularly relates to a reamer for directional long drilling of coal seams; the reamer comprises a reamer barrel, a strip-shaped groove is uniformly formed on the inner wall of the reamer barrel along the circumferential direction, a cutter seat is slidably arranged in the strip-shaped groove, and a cutter wing is mounted on the cutter seat; a top plate penetrating through the cutter seat is further hingedly arranged on the cutter seat, a driving part for driving all the cutter seats to synchronously slide up and down in the strip-shaped groove is further arranged in the reamer barrel, and the cutter wing is used for adjusting the position of the cutter wing protruding from the outer wall of the reamer barrel and further adjusting the cutting diameter during the up-and-down sliding of the cutter seat in the strip-shaped groove; the driving part further cooperates with the top plate to drive the top plate to swing and remove the coal ash in the gap of the cutter wing; the present application reduces the abrasion from layered cutting, cooperates with self-cleaning and heat dissipation to maintain the cutting efficiency, dynamically adjusts the hole diameter and real-time performs the hole wall trimming during the reaming process, and forms a functional closed loop from the local to the whole to jointly solve the problems of tool life, chip removal and hole forming accuracy in the reaming of hard coal seams.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of coal mine drilling, and particularly relates to a reamer for coal seam directional long drilling. BACKGROUND

[0002] The reamer for coal seam directional long drilling is a tool for expanding the diameter of a drilled hole in the process of coal seam directional long drilling in a coal mine, aiming to expand the diameter of the hole and improve the efficiency of gas extraction or other performances of the hole.

[0003] The current reamer mainly uses hydraulic pressure, air pressure or centrifugal force as power to drive the opening of the blade wing during the working process, and then expands the diameter of the hole by rotating the reamer to cut and crush the coal around the hole wall. In fact, in the process of cutting and crushing coal powder by the blade wing, the blade wing is quickly worn in very hard coal seams or coal seams containing a large number of hard nodules (such as pyrite nodules), and the service life is shortened. Frequent replacement of the blade wing will affect the construction efficiency; at the same time, the cut coal powder in the expansion process is easy to block the drill bit, affecting the blade wing's cutting speed, and causing poor heat dissipation of the blade wing, further affecting the service life of the blade wing.

[0004] Therefore, in order to improve the coal seam reaming effect and prolong the service life of the blade wing, the present application provides a reamer for coal seam directional long drilling which can differentiate the cutting thickness, reduce the aggravation of tool wear caused by over-thick single cutting, and push and discharge the coal powder in the blade wing gap by internal pushing design, thereby facilitating the heat dissipation and cutting of the blade wing. SUMMARY

[0005] In order to solve the above problems, the present application provides a reamer for coal seam directional long drilling to solve the problems mentioned in the background.

[0006] In order to achieve the above purpose, the present application provides the following technical scheme: the present application provides a reamer for coal seam directional long drilling, which comprises a reaming cutter barrel, a strip-shaped groove is uniformly formed on the inner wall of the reaming cutter barrel along its circumferential direction, a blade seat is slidably arranged in the strip-shaped groove, and a blade wing is mounted on the blade seat; a material pushing plate penetrating through the blade seat is further hingedly arranged on the blade seat; a driving part for driving all the blade seats to synchronously slide up and down in the strip-shaped groove is further arranged in the reaming cutter barrel; the blade seat slides up and down in the strip-shaped groove to adjust the position of the blade wing protruding from the outer wall of the reaming cutter barrel, thereby adjusting the cutting diameter; and the driving part further cooperates with the material pushing plate to drive the material pushing plate to swing and remove the coal powder in the gap of the blade wing.

[0007] A reaming guide head for guiding the verticality of reaming movement is threadedly mounted at the lower end of the reaming cutter barrel.

[0008] The blade wing is installed on the blade seat through a countersunk bolt; two sets of cutting teeth are arranged on the blade wing, the tooth thickness of the two sets of cutting teeth increases along the rotation direction of the central axis, and the tooth thickness of each set of cutting teeth gradually increases from bottom to top; tooth gaps for chip removal and cutting resistance reduction are equidistantly arranged on each set of cutting teeth from bottom to top; and a strip-shaped through hole for the top material plate to penetrate and swing is arranged on the blade wing.

[0009] According to an advantageous embodiment, the blade seat is also symmetrically provided with two connecting plates on the side facing the reaming tool barrel axis, and the connecting plates are provided with butt joints for clamping the driving part.

[0010] According to an advantageous embodiment, the driving part comprises an external thread table provided with threads at the lower end of the reaming tool barrel; the driving part further comprises a mounting plate movably arranged inside the reaming tool barrel, the upper end of the mounting plate is provided with an electric telescopic rod, the telescopic end of the electric telescopic rod is fixedly provided with an actuator, the actuator is uniformly provided with a supporting arm for cooperating with the top material plate to drive the hinged movement of the top material plate, and the end of the supporting arm in contact with the top material plate is provided with a ball.

[0011] The upper end surface of the mounting plate is also uniformly provided with an L-shaped clamping plate matched with the butt joint, the lower end of the mounting plate is fixedly provided with an electric push rod, the bottom end of the electric push rod is also fixedly arranged on the upper end surface of the external thread table through a bolt, and a buffer spring is further arranged between the external thread table and the mounting plate.

[0012] According to an advantageous embodiment, the upper and lower ends of the blade seat are both fixedly connected with telescopic protection parts for preventing coal powder from entering the inside of the reaming tool barrel along the strip-shaped groove during the drilling process, and the telescopic protection parts are fixedly connected with the groove walls at the corresponding positions.

[0013] According to an advantageous embodiment, the telescopic protection part is composed of an upper support, a lower support and an elastic sleeve fixed between the upper and lower supports, a spring is arranged inside the elastic sleeve, and the upper and lower ends of the spring are in contact with the two supports respectively.

[0014] According to an advantageous embodiment, the side wall of the strip-shaped groove is provided with two sets of inclined guide grooves, and a rotating column is detachably arranged on the blade seat at the corresponding position and slidably arranged in the inclined guide groove.

[0015] According to an advantageous embodiment, the lower end of the blade seat towards the reaming tool barrel axis is symmetrically provided with an ear seat, a top material plate is arranged between the two ear seats through a torsional spring, and the top material plate penetrates the blade seat and is located inside the strip-shaped through hole.

[0016] According to an advantageous embodiment, the lower end of the reaming guide head is arc-shaped, and the circumferential side wall is uniformly provided with strip-shaped blades.

[0017] According to an advantageous embodiment, the upper end outer wall of the tool holder is further provided with an elastic steel cutter for trimming the hole wall; the upper end of the elastic steel cutter is fixed to the slot wall.

[0018] According to an advantageous embodiment, the elastic steel cutter is provided with sawteeth on both sides.

[0019] Compared with the prior art, the reamer for directional long drilling of the coal seam has the following beneficial effects: 1. The cutter wing of the reamer adopts two groups of cutting teeth, the tooth thickness is gradiently increased along the rotation direction and from bottom to top, and the tooth gap is designed, so that the hard coal seam or the nodule is broken in stages through layered cutting, the instantaneous load caused by the too thick single cutting is avoided, the cutter wing chipping and heat accumulation are reduced, and the service life is prolonged; the secondary trimming of the elastic steel cutter can further eliminate the burrs of the hole wall and ensure the smoothness of the hole wall; the reaming guide head maintains the perpendicularity, and finally forms a high-precision and low-resistance gas extraction channel.

[0020] 2. The driving part linkage top plate swings to remove the coal powder in the cutter wing gap in real time; the debris generated by layered cutting is preliminarily discharged through the tooth gap, and the residual coal powder is forcibly removed by the top plate, so that the heat dissipation deterioration caused by blockage is avoided, and the risk of heat damage of the cutter wing is further reduced.

[0021] 3. The reamer reduces the wear from layered cutting, maintains the cutting efficiency through self-cleaning and heat dissipation, and dynamically adjusts the hole diameter and performs hole wall trimming in real time during the cutting and reaming process, so that the three form a functional closed loop from the local to the whole, and solve the problems of tool life, chip removal and hole forming accuracy in the reaming of the hard coal seam. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a whole three-dimensional structure diagram of the present application.

[0023] Figure 2 It is a three-dimensional structure diagram of the reaming cutter barrel after partial structure cutting of the present application.

[0024] Figure 3 It is a front view position plane section view of the present application.

[0025] Figure 4 It is a local structure three-dimensional view of the strip-shaped groove position of the present application.

[0026] Figure 5 It is a local structure enlarged view of A in the present application. Figure 2

[0027] Figure 6 It is a local structure enlarged view of B in the present application. Figure 3

[0028] Figure 7 Figure 3 ​​​Enlarged view of the local structure at C.

[0029] Figure 8 Is the invention reamer barrel internal structure sectional view.

[0030] Figure reference: 1, reamer barrel; 11, strip-shaped groove; 111, oblique guide groove; 12, tool holder; 121, rotating column; 122, connecting plate; 123, butt joint hole; 124, ear seat; 13, tool wing; 131, cutting tooth; 132, tooth gap; 133, strip-shaped through hole; 14, ejector plate; 2, driving part; 21, external thread table; 22, mounting plate; 23, electric telescopic rod; 24, actuator; 25, support arm; 251, ball; 26, L-shaped clamping plate; 27, electric push rod; 3, reaming guide head; 31, strip-shaped tool bar; 4, telescopic protection; 41, support; 42, elastic sleeve; 5, elastic steel knife. DETAILED DESCRIPTION

[0031] The following will be described in conjunction with the accompanying Figure 1 -Appendix Figure 8 Further detailed description of the present application.

[0032] Please see Figure 1 -3 and Figure 8 A reamer for directional long borehole in coal seam, comprising a reamer barrel 1 threadedly connected with the central axis of a drill rod, a strip-shaped groove 11 is uniformly formed on the inner wall of the reamer barrel 1 along the circumferential direction, a tool holder 12 is slidingly arranged inside the strip-shaped groove 11, and a tool wing 13 is mounted on the tool holder 12; a through tool holder 12 ejector plate 14 is also hingedly arranged on the tool holder 12, and one end of the ejector plate 14 is inclined; the reamer barrel 1 is further provided with a driving part 2 for driving all tool holders 12 to slide up and down synchronously inside the strip-shaped groove 11, and the tool holder 12 is adjusted in position to protrude out of the outer wall of the reamer barrel 1 during the up and down sliding process in the strip-shaped groove 11, thereby adjusting the cutting diameter; the driving part 2 also cooperates with the ejector plate 14 to drive the ejector plate 14 to swing and remove the coal powder in the gap of the tool wing 13.

[0033] In use, the lower end of the drill rod center shaft is screwed with the reaming cutter barrel 1, the reaming cutter barrel 1 is driven by the drill rod center shaft to move along the drill hole gradually, in the process of moving, the driving part 2 is needed to work to drive the cutter holder 12 to move up and down to adjust the distance of the blade wing 13 protruding outside the strip-shaped groove 11, the strip-shaped groove 11 is used to cut and ream the drill hole wall; when the driving part 2 drives the cutter holder 12 to move up and down, the precision sensor can be used to accurately measure the protruding thickness of the blade wing 13, so as to control the reaming diameter of the blade wing 13; for some parts with large reaming diameter, the cutter holder 12 can be driven to move in stages, so as to realize multiple cutting; the single cutting thickness is too large, which can cause the cutter to be stuck or the coal powder to be discharged not smoothly, thereby affecting the drilling efficiency.

[0034] Please refer to Figure 2 , the lower end of the reaming cutter barrel 1 is screwed with a reaming guide head 3 for guiding the reaming movement perpendicularity; the reaming guide head 3 is arranged in the cutting forward direction, which is used to guide the reamer to move along the original drill hole center axis, so as to avoid the reaming to be inclined and ensure the drilling perpendicularity.

[0035] Please refer to Figure 1 , the lower end of the reaming guide head 3 is arc-shaped, and the circumferential side outer wall is uniformly provided with a strip-shaped blade 31; the lower end is arc-shaped, which is used to guide the reamer to move along the original drill hole center axis, and the strip-shaped blade 31 is used to clean and dredge the position which may be collapsed and blocked in the drill hole, which is helpful for the smooth reaming work.

[0036] Please refer to Figure 5 and Figure 6 , the upper and lower ends of the cutter holder 12 are fixedly connected with telescopic protection pieces 4 for preventing the coal powder from entering the inside of the reaming cutter barrel 1 from the strip-shaped groove 11 during the drilling process, the telescopic protection pieces 4 are fixedly connected between the corresponding position of the strip-shaped groove 11 and the groove wall; the telescopic protection pieces 4 dynamically seal the gap between the strip-shaped groove 11 and the strip-shaped groove 11 through the cooperation of the elastic sleeve 42 and the spring when the cutter holder 12 moves up and down, which effectively prevents the coal powder from entering the inside of the reaming cutter barrel 1 and ensures the smooth sliding of the cutter holder 12. In the actual cutting and reaming process, part of the coal powder will enter the inside of the reaming cutter barrel 1, and the inside of the reaming cutter barrel 1 needs to be cleaned and dredged regularly after each reaming is completed.

[0037] Please refer to Figure 5The outer wall of the upper end of the tool holder 12 is further provided with an elastic steel cutter 5 for trimming the hole wall; the upper end of the elastic steel cutter 5 is fixed to the groove wall of the strip-shaped groove 11; the elastic steel cutter 5 is provided with sawteeth on both sides; the elastic steel cutter 5 can be used for secondary trimming of the hole wall after hole expansion; during the upward sliding adjustment of the tool holder 12, the tool holder 12 drives the tool wing 13 to protrude from the groove wall of the strip-shaped groove 11, so that the thickness of the tool wing 13 is increased, at this time, the elastic steel cutter 5 is bent, and the outward expansion arc is also increased to adapt to the cutting of the hole wall; conversely, the upward sliding of the tool holder 12 drives the tool wing 13 to gradually shrink into the strip-shaped groove 11, so that the cutting thickness is reduced, at this time, the elastic steel cutter 5 is gradually straightened.

[0038] Referring to Figure 5 and Figure 8 , the tool wing 13 is installed on the tool holder 12 through a countersunk bolt; the tool wing 13 is provided with two groups of cutting teeth 131, the tooth thickness of the two groups of cutting teeth 131 increases along the rotation direction of the central axis, and the tooth thickness of each group of cutting teeth 131 gradually increases from bottom to top; each group of cutting teeth 131 is provided with tooth gaps 132 for chip removal and reducing cutting resistance at equal intervals from bottom to top; the tool wing 13 is further provided with a strip-shaped through hole 133 for the top material plate 14 to penetrate and swing.

[0039] The tool wing 13 is detachably provided through a countersunk bolt, which is convenient for replacement; at the same time, the tool wing 13 is provided with two groups of cutting teeth 131 with different tooth thicknesses which increase along the rotation direction of the central axis, which is helpful for the tool wing 13 to process the cutting thickness of the coal seam in layers during hole expansion, reduce the single cutting thickness, and improve the cutting effect; the further provided tooth gaps 132 can increase the chip removal efficiency of the coal powder; at the same time, it is also helpful for heat dissipation of the tool wing 13.

[0040] Referring to Figure 4 , the side wall of the strip-shaped groove 11 is provided with two groups of oblique guide grooves 111, and the tool holder 12 is detachably provided with a rotating column 121 which is slidably installed in the oblique guide groove 111 at the corresponding position; when the tool holder 12 is installed, one end of the rotating column 121 is placed in the oblique guide groove 111, and the other end is placed in the tool holder 12 for fixation.

[0041] Referring to Figure 2 , Figure 4 and Figure 8 , the tool holder 12 is symmetrically provided with an ear seat 124 at the lower end of one side facing the axis of the hole expander cylinder 1, and a top material plate 14 is installed between the two ear seats 124 through a torsional spring, and the top material plate 14 penetrates the tool holder 12 and is located in the inside of the strip-shaped through hole 133; the top material plate 14 can be twisted around the hinge position as the center by the driving part 2, so that the top material plate 14 can press along the strip-shaped through hole 133 on the tool wing 13, and the coal powder jammed in the tool wing 13 can be dredged, so as to facilitate the cutting and hole expansion work of the tool wing 13.

[0042] Referring to Figure 2 and Figure 8 , the cutter seat 12 is also symmetrically provided with two connecting plates 122 on one side of the reaming cutter barrel 1 axis, and the connecting plates 122 are provided with a butt joint hole 123 for clamping with the driving part 2; the connecting plates 122 are connected with the driving part 2.

[0043] Referring to Figure 6 , the telescopic protection piece 4 is composed of two upper and lower supports 41 and an elastic sleeve 42 fixed between the two upper and lower supports 41, and a spring is arranged inside the elastic sleeve 42, and the upper and lower ends of the spring are respectively abutted between the two supports 41; with the up and down sliding of the cutter seat 12, the spring is compressed or stretched, and the elastic sleeve 42 is also adaptively changed, sealing the gap between the cutter seat 12 and the groove wall of the strip-shaped groove 11, which helps to block the coal powder into the inside of the reaming cutter barrel 1.

[0044] Referring to Figure 5 , Figure 7 and Figure 8 , the driving part 2 includes an external thread table 21 provided with threads at the lower end of the reaming cutter barrel 1; the driving part 2 further includes a mounting plate 22 movably arranged inside the reaming cutter barrel 1, and the upper end of the mounting plate 22 is provided with an electric telescopic rod 23 at the middle part, and the telescopic end of the electric telescopic rod 23 is fixedly provided with an execution part 24, and the execution part 24 is uniformly provided with a supporting arm 25 matched with the material pushing plate 14 to drive the hinged movement of the material pushing plate 14, and the end of the supporting arm 25 abutting against the material pushing plate 14 is provided with a ball 251; the upper end surface of the mounting plate 22 is also uniformly provided with an L-shaped clamping plate 26 matched with the butt joint hole 123 for clamping, and the lower end of the mounting plate 22 is fixedly provided with an electric push rod 27, and the bottom end of the electric push rod 27 is also fixedly arranged on the upper end surface of the external thread table 21 through bolts, and the external thread table 21 and the mounting plate 22 are further provided with a buffer spring.

[0045] When the driving part 2 is installed, the mounting plate 22, the electric telescopic rod 23, the execution part 24, the supporting arm 25, the L-shaped clamping plate 26 and the electric push rod 27 are assembled together and then sent into the inside of the reaming cutter barrel 1 from the lower end of the reaming cutter barrel 1, then the mounting plate 22 is rotated to drive the L-shaped clamping plate 26 to be clamped into the butt joint hole 123 of the connecting plate 122 to complete the fixation; finally, the buffer spring is sleeved outside the electric push rod 27 and then screwed into the external thread table 21, and the bottom end of the electric push rod 27 and the external thread table 21 are fixed through bolts; when the cutter seat 12 is adjusted to slide up and down, the electric push rod 27 can be worked to drive the cutter seat 12 to move through the mounting plate 22, the L-shaped clamping plate 26 and the connecting plate 122; when the material pushing plate 14 is swung to remove the coal powder in the gap of the blade wing 13, the electric telescopic rod 23 can be pushed to move the execution part 24, so that the supporting arm 25 and the material pushing plate 14 move relatively from top to bottom to push the material pushing plate 14 outward by the inclined outer wall of the material pushing plate 14.

[0046] Specifically using the present application, first, the lower end of the drill rod center axis is screwed with the reaming cutter barrel 1, then the reaming guide head 3 is installed at the lower end of the reaming cutter barrel 1, then the cutter seat 12 is driven to move up and down by the driving part 2 to adjust the distance of the cutter wing 13 protruding outside the strip-shaped groove 11, and the strip-shaped groove 11 is cut and reamed by the cutter wing 13 protruding outside the strip-shaped groove 11; during the reaming process, the reaming cutter barrel 1 is gradually moved along the drill hole by the drill rod center axis, for some parts with larger reaming diameters, the cutter seat 12 can be moved in stages to realize multiple cutting; with the cutting process, the actuator 24 can be moved by the electric telescopic rod 23 at regular intervals, so that the supporting arm 25 and the material ejecting plate 14 move relative to each other from top to bottom, and the coal powder in the gap of the cutter wing 13 is removed by the outer wall of the material ejecting plate 14.

[0047] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, 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 devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0048] In addition, the terms "first", "second", "one", "two" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second", "one", "two" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0049] In the present application, unless otherwise specifically specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; 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 internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. 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.

[0050] The embodiments of the present application are preferred embodiments of the present application, and do not limit the protection scope of the present application, and thus, equivalent changes made on the basis of the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A reamer for directional long drilling in coal seams, characterized in that; The device includes a reaming cutter barrel, with uniformly spaced circumferential grooves on its inner wall. A cutter holder is slidably mounted inside the grooves, and cutter wings are installed on the cutter holder. A top plate is hinged to the cutter holder and extends through it. The reaming cutter barrel also contains a drive unit for driving all cutter holders to slide synchronously up and down within the grooves. During the up-and-down sliding of the cutter holders within the grooves, the drive unit adjusts the position of the cutter wings protruding from the outer wall of the reaming cutter barrel, thereby adjusting the cutting diameter. The drive unit also cooperates with the top plate to drive the top plate to swing and remove coal dust from the gaps between the cutter wings. The lower end of the reaming barrel is threaded with a reaming guide head for guiding the verticality of the reaming movement; The blade is mounted on the blade holder by countersunk bolts; two sets of cutting teeth are provided on the blade, the tooth thickness of the two sets of cutting teeth increases along the rotation direction of their central axis, and the tooth thickness of each set of cutting teeth gradually increases from bottom to top; each set of cutting teeth is provided with tooth gaps at equal intervals from bottom to top for chip removal and reducing cutting resistance; the blade is also provided with strip-shaped through holes for the top plate to swing through.

2. The reamer for directional long drilling in coal seams according to claim 1, characterized in that, Two connecting plates are symmetrically arranged on the side of the tool holder facing the axis of the reaming tool barrel, and the connecting plates are provided with mating holes for engaging with the drive unit.

3. A reamer for directional long drilling in coal seams according to claim 2, characterized in that, The drive unit includes an external threaded platform threaded at the lower end of the reaming barrel; the drive unit also includes a mounting plate movably disposed inside the reaming barrel, an electric telescopic rod is mounted on the upper middle part of the mounting plate, an actuator is fixedly mounted on the telescopic end of the electric telescopic rod, and a support arm is evenly disposed on the actuator to cooperate with the top plate and drive its hinged movement, and a ball bearing is disposed at the end of the support arm that abuts against the top plate. The upper surface of the mounting plate is also evenly provided with L-shaped clamping plates that fit and engage with the mating holes. An electric push rod is fixedly installed at the lower end of the mounting plate. The bottom end of the electric push rod is also fixedly installed on the upper surface of the external thread platform by bolts. A buffer spring is also provided between the external thread platform and the mounting plate.

4. A reamer for directional long drilling in coal seams according to claim 1, characterized in that, Both the upper and lower ends of the tool holder are fixedly connected to telescopic protective components to prevent coal dust from entering the reaming tool barrel along the strip groove during drilling. The telescopic protective components are fixedly connected to the groove wall at the corresponding position.

5. A reamer for directional long drilling in coal seams according to claim 4, characterized in that, The telescopic protective component consists of two supports, an upper and a lower one, and an elastic sleeve fixed between the two supports. A spring is installed inside the elastic sleeve, with the upper and lower ends of the spring abutting against the two supports respectively.

6. A reamer for directional long drilling in coal seams according to claim 1, characterized in that, The sidewall of the strip groove is provided with two sets of inclined guide grooves, and a rotating column is detachably installed and slidably mounted inside the inclined guide groove at the corresponding position on the tool holder.

7. A reamer for directional long drilling in coal seams according to claim 1, characterized in that, The tool holder is symmetrically provided with ear seats on the lower end of one side facing the axis of the reaming tool barrel. A top plate is installed between the two ear seats by a torsion spring, and the top plate passes through the tool holder and is located inside the strip-shaped through hole.

8. A reamer for directional long drilling in coal seams according to claim 1, characterized in that, The lower end of the hole-expanding guide head is arc-shaped, and strip-shaped blades are evenly arranged on its outer periphery.

9. A reamer for directional long drilling in coal seams according to claim 1, characterized in that, The upper outer wall of the tool holder is also equipped with an elastic steel tool for trimming the hole wall; the upper end of the elastic steel tool is fixed to the groove wall of the strip.

10. A reamer for directional long drilling in coal seams according to claim 9, characterized in that, The elastic steel blade has serrations evenly distributed on both sides.

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