Hole collapse prevention device in coal seam gas extraction drill hole

Abstract

The utility model relates to a hole collapse prevention device in a coal seam gas extraction drill hole, which belongs to the technical field of coal seam gas extraction and comprises a central column positioned at the center, and a hole is formed in the central column along the height direction; and an abutting mechanism for resisting the pressure of the coal body and a control mechanism are arranged outside the central column. The multiple abutting mechanisms are arranged on the periphery of the center column and distributed in a circumferential array mode. Each abutting mechanism comprises a connecting plate, and the connecting plates are parallel to the central axis of the central column. And two groups of abutting assemblies which are symmetrically arranged up and down are arranged between the connecting plate and the central column. An irreversible elastic piece is fixedly installed between the center column and the connecting plate, so that the movable plate and the inner wall of the drill hole are confronted, and therefore the drill hole is prevented from collapsing. The abutting mechanism and the control mechanism comprise a plurality of springs, the counterforce is improved, and therefore the hole collapse prevention effect is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal seam gas extraction, and in particular relates to a hole collapse prevention device in a coal seam gas extraction drilling hole. Background Art

[0002] Borehole gas extraction is an important measure to prevent and control coal mine gas disasters. During the borehole gas extraction process in soft coal seams, due to the weak coal quality strength and the influence of drilling disturbance, mining, gas extraction, etc., the borehole is very likely to collapse, reducing the gas extraction effect and seriously affecting the coal seam gas extraction efficiency.

[0003] Existing technologies for borehole support typically utilize techniques such as lowering screens, which are ineffective and result in poor gas extraction. Current technologies lack effective borehole support devices to ensure proper gas extraction. Therefore, to address the issue of borehole collapse in coalbed gas extraction drill holes, a simple and easy-to-use anti-collapse device is urgently needed to ensure efficient borehole extraction. Utility Model Content

[0004] In response to the shortcomings of the existing technology, the utility model provides a device for preventing the collapse of coal seam gas extraction drilling holes, which can be effectively used in coal seam gas extraction drilling holes to achieve anti-collapse support in the drilling holes, with good use effect and high practicality.

[0005] A device for preventing hole collapse in a coal seam gas extraction borehole comprises a central column located at the center with holes opened in the height direction; an abutment mechanism and a control mechanism for resisting coal body pressure are arranged on the outside of the central column.

[0006] The cross section of the central column is a quadrilateral.

[0007] Multiple groups of abutment mechanisms are arranged around the central column and distributed in a circular array; each group of abutment mechanisms includes a connecting plate, which is arranged parallel to the central axis of the central column; two groups of abutment components are arranged symmetrically between the connecting plate and the central column.

[0008] The number of the abutment mechanisms is 4, distributed in a circular array on the four sides of the central column.

[0009] The abutment assembly includes a rectangular sleeve 1, a movable rod 1, a connecting plate, a slot, a clamping rod, a connecting piece, a spring 1, and a spring 2. One end of the rectangular sleeve 1 is fixedly connected to the outer wall of the center column, the movable rod 1 is movably connected to the inside of the rectangular sleeve 1, and one end is fixedly connected to one side of the outer wall of the connecting plate; the spring 2 is arranged inside the rectangular sleeve 1, and its two ends are respectively fixedly connected to one end of the movable rod 1 located inside the rectangular sleeve 1 and the outer wall of the center column. Under normal conditions, the spring 2 is in a compressed state; the slot is opened on the movable rod 1, and one end of the clamping rod is inserted into the inside of the slot; the clamping rod passes through one side of the outer wall of the rectangular sleeve 1 and extends to the inside of the slot, and the clamping rod is slidably connected to the rectangular sleeve 1; the connecting piece is fixedly connected to the outer wall of the clamping rod, one end of the spring 1 is fixedly connected to the outer wall of the connecting piece, and the other end of the spring 1 is fixedly connected to the outer wall of the rectangular sleeve 1.

[0010] The outer wall of the central column is fixedly connected to a circular sleeve, the outer wall of the connecting plate is fixedly connected to a cylinder, and the cylinder is slidably connected to the inside of the circular sleeve; a spring five is provided inside the circular sleeve, and the two ends of the spring five are respectively fixedly connected to the outer wall of the central column and one end of the cylinder located inside the circular sleeve, and are in a compressed state.

[0011] An irreversible elastic sheet is fixedly installed between the central column and the connecting plate.

[0012] The control mechanism includes a movable plate, a third spring, a round rod, a connecting rope, a fixed pulley, and a second rectangular sleeve. The movable plate is arranged on the outside of the connecting plate, one end of the connecting rope is fixedly connected to the end of the card rod away from the card slot, and the other end of the connecting rope is fixedly connected to the outer wall of the round rod; one end of the round rod is fixedly connected to the side of the movable plate facing the connecting plate, and passes through the connecting plate and is slidably connected to the connecting plate; the fixed pulley is fixedly installed on the outer wall of the center column, and the connecting rope passes through the fixed pulley and is movably connected to the fixed pulley; the third spring is arranged between the movable plate and the connecting plate, and the second rectangular sleeve is fixedly installed on the side of the connecting plate away from the center column, and is sleeved on the outside of the third spring.

[0013] One end of the movable rod 2 is fixedly connected to the outer wall of the movable plate near the connecting plate, and the two ends of the spring 3 are respectively fixedly connected to the other end of the movable rod 2 and the outer wall of the connecting plate. The spring 3 enables the movable plate to move toward the connecting plate when under pressure.

[0014] A blocking mechanism is provided on the outside of the central column, and the blocking mechanism includes a trapezoidal rod 1, a support plate, a trapezoidal rod 2, a circular plate, and a spring 4. The non-beveled end of the trapezoidal rod 1 is fixedly connected to the outer wall of the movable rod 1, the support plate is fixedly connected to the outer wall of the central column, the trapezoidal rod 2 passes through the support plate and is slidably connected to the support plate, the non-beveled end of the trapezoidal rod 2 is provided with a circular plate, and a spring 4 is provided between the circular plate and the support plate. The beveled end of the trapezoidal rod 1 is arranged opposite to the beveled end of the trapezoidal rod 2.

[0015] The beneficial effects of the utility model are:

[0016] 1. In the device for preventing the hole from collapsing in a coal seam gas extraction borehole provided by the utility model, when the movable plate is subjected to the pressure of the coal body, the movable plate moves toward the connecting plate, and at the same time drives the round rod to move. The round rod pulls the clamping rod through the connecting rope, so that the clamping rod disengages from the clamping slot. The movable rod and the irreversible spring piece release the restriction, so that the movable plate abuts against the inner wall of the borehole, thereby achieving the purpose of preventing the hole from collapsing.

[0017] 2. In the anti-collapse device for coal seam gas extraction drilling holes provided by the utility model, an irreversible spring sheet is provided to enable the movable plate to resist the inner wall of the drilling hole, thereby preventing the drilling hole from collapsing. Springs two, three and five can enhance the resisting force of the movable plate, thereby improving the effect of preventing the hole from collapsing.

[0018] 3. In the anti-collapse device for coal seam gas extraction drilling holes provided by the utility model, when the movable rod one moves, the trapezoidal rod one is driven to move, and the inclined surface of the trapezoidal rod one squeezes the inclined surface of the trapezoidal rod two, so that the trapezoidal rod two moves away from the trapezoidal rod one, thereby not blocking the movement of the trapezoidal rod one. When the two are no longer squeezed, the trapezoidal rod two is reset under the action of the spring four to prevent the trapezoidal rod one from retracting, so that the movable plate remains in an outward-moved state, further improving the effect of preventing the collapse of the hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the external structure of the anti-hole collapse device for coal seam gas extraction drilling provided by the utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of the anti-collapse device for coal seam gas extraction drilling provided by the utility model;

[0021] Figure 3 for Figure 2 A magnified view of part A in FIG;

[0022] Figure 4 It is a structural diagram of the control mechanism in the present utility model;

[0023] Figure 5 This is a structural diagram of the movable sleeve 2 and the movable plate portion of the utility model;

[0024] Figure 6 This is a schematic structural diagram of the circular sleeve and the cylinder of the utility model;

[0025] In the picture:

[0026] 1-Center column, 2-Hole, 3-Abutment mechanism, 31-Rectangular sleeve one, 32-Movable rod one, 33-Connecting plate, 34-Slot, 35-Movable rod, 36-Connecting plate, 37-Spring one, 38-Spring two, 4-Control mechanism, 41-Movable plate, 42-Spring three, 43-Round rod, 44-Connecting rope, 45-Fixed pulley, 46-Rectangular sleeve two, 47-Movable rod two, 5-Blocking mechanism, 51-Trapezoidal rod one, 52-Support plate, 53-Trapezoidal rod two, 54-Circular plate, 55-Spring four, 6-Irreversible spring, 7-Circular sleeve, 8-Cylinder, 9-Spring five DETAILED DESCRIPTION

[0027] In order to better explain the present invention and facilitate understanding, the technical solutions and effects of the present invention are described in detail below with reference to the accompanying drawings through specific implementation methods.

[0028] like Figures 1-6 As shown, a device for preventing the hole from collapsing in a coal seam gas extraction borehole comprises a central column 1 located in the center, the cross section of the central column 1 being a quadrilateral; a hole 2 is opened on the central column 1 along the height direction; an abutment mechanism 3 and a control mechanism 4 are provided on the outside of the central column 1.

[0029] Four sets of abutment mechanisms 3 are arranged around the central column 1, forming a circular array on all four sides of the central column 1. Each set of abutment mechanisms 3 includes a connecting plate 33, which is arranged parallel to the central axis of the central column 1. Two sets of abutment assemblies are arranged between the connecting plate 33 and the central column 1, with the two sets of abutment assemblies on each side of the central column 1 arranged symmetrically in a vertical direction. The abutment assemblies include a rectangular sleeve 31, a movable rod 32, a connecting plate 33, a slot 34, a latch 35, a connecting piece 36, a spring 37, and a spring 38. One end of the rectangular sleeve 31 is fixedly connected to the outer wall of the central column 1, and the movable rod 32 is movably connected to the interior of the rectangular sleeve 31, with one end fixedly connected to one side of the outer wall of the connecting plate 33. The spring 38 is arranged inside the rectangular sleeve 31, with its two ends fixedly connected to the end of the movable rod 32 located inside the rectangular sleeve 31 and the outer wall of the central column 1, respectively. Under normal conditions, the spring 38 is in a compressed state. The latching slot 34 is defined on the movable rod 1 32 , and one end of the latching rod 35 is inserted into the interior of the latching slot 34 . The latching rod 35 extends through one side of the outer wall of the rectangular sleeve 1 31 into the interior of the latching slot 34 , and is slidably connected to the rectangular sleeve 1 31 . The connecting piece 36 is fixedly connected to the outer wall of the latching rod 35 , and one end of the spring 1 37 is fixedly connected to the outer wall of the connecting piece 36 , while the other end of the spring 1 37 is fixedly connected to the outer wall of the rectangular sleeve 1 31 . The arrangement of the spring 1 37 and the connecting piece 36 ensures that the latching rod 35 is stably inserted into the latching slot 34 and can be pulled.

[0030] A circular sleeve 7 is fixedly connected to the outer wall of the center column 1, and a cylinder 8 is fixedly connected to the outer wall of the connecting plate 33. The cylinder 8 is slidably connected to the interior of the sleeve 7. A spring 59 is installed inside the sleeve 7. The ends of the spring 59 are respectively fixedly connected to the outer wall of the center column 1 and the end of the cylinder 8 located inside the sleeve 7, and are in a compressed state. The arrangement of the sleeve 7, cylinder 8, and spring 59 ensures that the connecting plate 33 is stably mounted on the exterior of the center column 1. When the connecting plate 33 expands outward, the spring 59 provides a counteracting force.

[0031] An irreversible elastic sheet 6 is fixedly installed between the central column 1 and the connecting plate 33, so that the movable plate 41 is in contact with the inner wall of the drill hole, thereby preventing the drill hole from collapsing.

[0032] The control mechanism 4 includes a movable plate 41, a third spring 42, a round rod 43, a connecting rope 44, a fixed pulley 45, a second rectangular sleeve 46, and a second movable rod 47. The movable plate 41 is arranged on the outside of the connecting plate 33. One end of the connecting rope 44 is fixedly connected to the end of the clamping rod 35 away from the clamping slot 34, and the other end of the connecting rope 44 is fixedly connected to the outer wall of the round rod 43. One end of the round rod 43 is fixedly connected to the side of the movable plate 41 facing the connecting plate 33, and passes through the connecting plate 33 and is slidably connected to the connecting plate 33. The fixed pulley 45 is fixedly mounted on the outer wall of the center column 1, and the connecting rope 44 passes through the fixed pulley 45 and is movably connected to the fixed pulley 45. The third spring 42 is arranged between the movable plate 41 and the connecting plate 33. Specifically, one end of the second movable rod 47 is fixedly connected to the outer wall of the movable plate 41 on the side close to the connecting plate 33, and the two ends of the third spring 42 are fixedly connected to the other end of the second movable rod 47 and the outer wall of the connecting plate 33, respectively. The third spring 42 allows the movable plate 41 to move toward the connecting plate 33 when under pressure. The fixed pulley 45 allows the connecting rope 44 to pull the clamping rod 35 when the movable plate 41 moves toward the connecting plate 33. The second rectangular sleeve 46 is fixedly mounted on the side of the connecting plate 33 away from the center column 1 and is sleeved outside the third spring 42. The second rectangular sleeve 46 and the second movable rod 47 allow the movable plate 41 to move stably under pressure.

[0033] A blocking mechanism 5 is provided on the outside of the central column 1, and the blocking mechanism 5 includes a trapezoidal rod 1 51, a support plate 52, a trapezoidal rod 2 53, a circular plate 54, and a spring 4 55. The non-slanted end of the trapezoidal rod 1 51 is fixedly connected to the outer wall of the movable rod 1 32, and the support plate 52 is fixedly connected to the outer wall of the central column 1. The trapezoidal rod 2 53 passes through the support plate 52 and is slidably connected to the support plate 52. A circular plate 54 is provided on the non-slanted end of the trapezoidal rod 2 53, and a spring 4 55 is provided between the circular plate 54 and the support plate 52. The inclined end of the trapezoidal rod 1 51 and the inclined end of the trapezoidal rod 2 53 are arranged opposite to each other. By setting the trapezoidal rod 1 51 and the trapezoidal rod 2 53, they can squeeze each other, and by setting the spring 4 55, the trapezoidal rod 2 53 can move when the inclined surface is squeezed.

[0034] When the movable plate 41 is subjected to coal pressure, it moves toward the connecting plate 33, simultaneously driving the round rod 43 to move. The round rod 43 pulls the clamping rod 35 via the connecting rope 44, causing the clamping rod 35 to disengage from the clamping slot 34. The movable rod 1 32 and the irreversible spring 6 release their restraints, allowing the movable plate 41 to abut against the inner wall of the drilled hole, thereby preventing the hole from collapsing. Simultaneously, the movement of the movable rod 1 32 drives the movement of the trapezoidal rod 1 51. The inclined surface of the trapezoidal rod 1 51 presses against the inclined surface of the trapezoidal rod 2 53, causing the trapezoidal rod 2 53 to move away from the trapezoidal rod 1 51, thereby not blocking the movement of the trapezoidal rod 1 51. When the two are no longer in compression, the trapezoidal rod 2 53 resets under the action of the spring 4 55, preventing the trapezoidal rod 1 51 from retracting. This allows the movable plate 41 to remain in the outward position, further improving the effectiveness of preventing the hole from collapsing.

Claims

1. A device for preventing hole collapse in a coal seam gas extraction borehole, characterized by: The invention comprises a central column located in the center, with holes opened on the central column along the height direction; an abutment mechanism and a control mechanism for resisting coal body pressure are arranged on the outside of the central column.

2. The device for preventing hole collapse in a coal seam gas extraction borehole according to claim 1, characterized in that: The cross section of the central column is a quadrilateral.

3. The device for preventing hole collapse in a coal seam gas extraction borehole according to claim 2, characterized in that: Multiple groups of abutment mechanisms are arranged around the central column and distributed in a circular array; each group of abutment mechanisms includes a connecting plate, which is arranged parallel to the central axis of the central column; two groups of abutment components are arranged symmetrically between the connecting plate and the central column.

4. The device for preventing hole collapse in a coal seam gas extraction borehole according to claim 3, characterized in that: The number of the abutment mechanisms is 4, distributed in a circular array on the four sides of the central column.

5. The device for preventing hole collapse in a coal seam gas extraction borehole according to claim 3, characterized in that: The abutment assembly includes a rectangular sleeve 1, a movable rod 1, a connecting plate, a slot, a clamping rod, a connecting piece, a spring 1, and a spring 2. One end of the rectangular sleeve 1 is fixedly connected to the outer wall of the center column, the movable rod 1 is movably connected to the inside of the rectangular sleeve 1, and one end is fixedly connected to one side of the outer wall of the connecting plate; the spring 2 is arranged inside the rectangular sleeve 1, and its two ends are respectively fixedly connected to one end of the movable rod 1 located inside the rectangular sleeve 1 and the outer wall of the center column. Under normal conditions, the spring 2 is in a compressed state; the slot is opened on the movable rod 1, and one end of the clamping rod is inserted into the inside of the slot; the clamping rod passes through one side of the outer wall of the rectangular sleeve 1 and extends to the inside of the slot, and the clamping rod is slidably connected to the rectangular sleeve 1; the connecting piece is fixedly connected to the outer wall of the clamping rod, one end of the spring 1 is fixedly connected to the outer wall of the connecting piece, and the other end of the spring 1 is fixedly connected to the outer wall of the rectangular sleeve 1.

6. The device for preventing hole collapse in a coal seam gas extraction borehole according to claim 5, characterized in that: The outer wall of the central column is fixedly connected to a circular sleeve, the outer wall of the connecting plate is fixedly connected to a cylinder, and the cylinder is slidably connected to the inside of the circular sleeve; a spring five is provided inside the circular sleeve, and the two ends of the spring five are respectively fixedly connected to the outer wall of the central column and one end of the cylinder located inside the circular sleeve, and are in a compressed state.

7. The device for preventing hole collapse in a coal seam gas extraction borehole according to claim 3, characterized in that: An irreversible elastic sheet is fixedly installed between the central column and the connecting plate.

8. The device for preventing hole collapse in a coal seam gas extraction borehole according to claim 3, characterized in that: The control mechanism includes a movable plate, a third spring, a round rod, a connecting rope, a fixed pulley, and a second rectangular sleeve. The movable plate is arranged on the outside of the connecting plate, one end of the connecting rope is fixedly connected to the end of the card rod away from the card slot, and the other end of the connecting rope is fixedly connected to the outer wall of the round rod; one end of the round rod is fixedly connected to the side of the movable plate facing the connecting plate, and passes through the connecting plate and is slidably connected to the connecting plate; the fixed pulley is fixedly installed on the outer wall of the center column, and the connecting rope passes through the fixed pulley and is movably connected to the fixed pulley; the third spring is arranged between the movable plate and the connecting plate, and the second rectangular sleeve is fixedly installed on the side of the connecting plate away from the center column, and is sleeved on the outside of the third spring.

9. The device for preventing hole collapse in a coal seam gas extraction borehole according to claim 8, characterized in that: One end of the movable rod 2 is fixedly connected to the outer wall of the movable plate near the connecting plate, and the two ends of the spring 3 are respectively fixedly connected to the other end of the movable rod 2 and the outer wall of the connecting plate. The spring 3 enables the movable plate to move toward the connecting plate when under pressure.

10. The device for preventing hole collapse in a coal seam gas extraction borehole according to claim 1, characterized in that: A blocking mechanism is provided on the outside of the central column, and the blocking mechanism includes a trapezoidal rod 1, a support plate, a trapezoidal rod 2, a circular plate, and a spring 4. The non-beveled end of the trapezoidal rod 1 is fixedly connected to the outer wall of the movable rod 1, the support plate is fixedly connected to the outer wall of the central column, the trapezoidal rod 2 passes through the support plate and is slidably connected to the support plate, the non-beveled end of the trapezoidal rod 2 is provided with a circular plate, and a spring 4 is provided between the circular plate and the support plate. The beveled end of the trapezoidal rod 1 is arranged opposite to the beveled end of the trapezoidal rod 2.

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