CN102561952A - Large-through-hole opening type all-dimensional drilling bit and sieve tube lowering method thereof - Google Patents
Large-through-hole opening type all-dimensional drilling bit and sieve tube lowering method thereof Download PDFInfo
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- CN102561952A CN102561952A CN201110384503XA CN201110384503A CN102561952A CN 102561952 A CN102561952 A CN 102561952A CN 201110384503X A CN201110384503X A CN 201110384503XA CN 201110384503 A CN201110384503 A CN 201110384503A CN 102561952 A CN102561952 A CN 102561952A
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Abstract
The invention discloses a large-through-hole opening type all-dimensional drilling bit, which comprises an outer bit with a hollow columnar structure and a center bit. A mounting hole/mounting groove for holding the center bit is arranged on an outer peripheral wall of one side of the outer bit, a lap joint hole/lap joint groove is arranged on an outer peripheral wall of the other side, which is opposite to the mounting hole/mounting groove, of the outer bit, a fixed end of the center bit is hinged at the bottom of the mounting hole/mounting groove via a hinge pin, a free end of the center bit is fixed in the lap joint hole/lap joint groove via an anti-releasing device, the geometric dimension of the mounting hole/mounting groove is larger than or equal to the corresponding geometric dimension of the center bit, and both the outer bit and the center bit are provided with tool bits. The invention further discloses a sieve tube lowering method. The sieve tube lowering method comprises following steps: 1) adopting the large-through-hole opening type all-dimensional drilling bit to drill a hole; 2) leading a sieve tube to reach the bottom of the hole via an inner hole of a drill stem and inner holes of the bits; and 3) keeping the sieve tube fixed, and withdrawing the large-through-hole opening type all-dimensional drilling bit and the assorted drill stem.
Description
Technical field
The present invention relates to a kind of be used for drill bit that weak seam creeps into adopt this drill bit screen casing to be transferred the method to the boring, concrete the is comprehensive Drilling bore bit of a kind of large through-hole open and close type and adopt the comprehensive Drilling bore bit pore-forming of this large through-hole open and close type after screen casing transfer method.
Background technology
In process of coal mining, for guaranteeing safety in production, need the coal containing methane gas layer is carried out gas pumping, its main mode is that mash gas pumping drilling construction is carried out in the coal seam.At present; Generally on the colliery adopt full section drill bit to carry out drilling construction,, destroyed stablizing to have increased simultaneously and creeping into deviation of hole wall because that drill bit is scratched with drilling rod is bigger; Cause hole wall collapse and boring off-design track, and then influenced into porosity and gas pumping effect.
In addition, be to improve gas drainage under suction efficient, the drawing-off gas passages are stopped up in avoid collapsing behind the pore-forming hole, the hole of collapsing etc., and some collieries are adopted and transferred screen casing technology and construct, and promptly pore-forming moves back and bores the back and in boring, transfer screen casing, guarantees that with screen casing the drawing-off gas passage is unimpeded.When adopting common drill bit to construct; For weak seam; Collapse because boring very easily takes place, brill is moved back when transferring screen casing again in intact hole, and can to cause screen casing to transfer the degree of depth too shallow even can't transfer at all in obstruction in the hole; That has significantly reduced boring effectively utilizes length, and then has also influenced the gas drainage under suction effect of this technology greatly.
Application number is that the Chinese patent of CN201110006231.X discloses a kind of multi-stage reducing drilling tool, and this multi-stage reducing drilling tool is three to four drill bits of design on same drill body, forms a multi-stage reducing drilling tool, and pick is 120 degree three wings and distributes.When creeping into, the one-level drill bit is at first beaten the 42mm slim hole; Then; Back one-level drill bit is the cut coal body in the plastic circle of previous stage boring, reduces the disturbance of coal cutting operation to stress in coal bed and mash gas dynamic state, prevents spray orifice; And cut falls the plastic strain of previous stage boring, the plastic strain that prevents to hole to the stick of tool of drilling rod, embrace the brill behavior; Through three to four reducing cuts, accomplish the construction of 75mm, 89mm and the boring of 108mm diameter.
Though this multi-stage reducing drilling tool can be used in soft projecting coal bed and high gas layer construction along layer boring; And have the advantage that prevents to cause drilling construction depth as shallow and constructional difficulties to a certain extent because of spray orifice, stick of tool, still, adopt the boring of this multi-stage reducing drilling tool after; Just can transfer screen casing after need drill bit being withdrawed from; Because the coal seam is soft, boring very easily takes place collapses, can to cause screen casing to transfer the degree of depth too shallow even can't transfer at all in obstruction in the hole.
Therefore; The present invention is intended to explore the comprehensive Drilling bore bit of a kind of large through-hole open and close type and adopts the screen casing of this drill bit to transfer method; The comprehensive Drilling bore bit of this large through-hole open and close type not only can be holed on weak seam; And needn't carry brill behind the pore-forming and can directly transfer screen casing, can effectively avoid collapsing and causing screen casing to transfer the defective that the degree of depth is not enough even can't transfer owing to boring.
Summary of the invention
The technical problem that the present invention will solve is to propose the comprehensive Drilling bore bit of a kind of large through-hole open and close type to transfer method with the screen casing that adopts this bit bore; The comprehensive Drilling bore bit of this large through-hole open and close type not only can be holed on weak seam; And needn't carry brill behind the pore-forming and can directly transfer screen casing, can effectively avoid collapsing and causing screen casing to transfer the defective that the degree of depth is not enough even can't transfer owing to boring.
Realize above-mentioned technical purpose; The comprehensive Drilling bore bit of large through-hole open and close type of the present invention; Comprise outer drill bit that is hollow columnar structures and the center bit that is installed in the outer drill bit; Offer the installing hole/mounting groove that is used to hold center bit on the said outer drill bit one side periphery wall; The opposite side periphery wall that said outer drill bit is relative with this installing hole/mounting groove is provided with overlap joint hole/overlap joint groove; The fixed end of said center bit is hinged on the bottom of said installing hole/mounting groove through bearing pin, and the free end of said center bit is fixed in overlap joint hole/overlap joint groove through anti-drop device, and the physical dimension of said installing hole/mounting groove is more than or equal to the physical dimension of said center bit correspondence; And said center bit overcomes anti-drop device under responsive to axial force restraint forces is the rotating shaft rotation with the bearing pin and places in said installing hole/mounting groove, is equipped with cutter head on said outer drill bit and the center bit.
Further, said outer drill bit is to comprise the multistage drill bit structure of one-level drill bit at least, and is lower than compared to this internal layer drill bit farther outer drill end of bit central outside said near the top of the internal layer drill bit of said outer bit central;
Further, said center bit is that cuboid or said center bit are provided with drill end bulge-structure outside said;
Further, said anti-drop device comprises the anti-drop block that is separately positioned on said center bit both sides, and said anti-drop block links to each other with said center bit through flexible member, and the sidewall of said overlap joint hole/overlap joint groove is provided with the anticreep hole that is complementary with said anti-drop block;
Further; Said anti-drop device comprises the anti-drop block that is separately positioned on said center bit both sides; The side of said center bit is provided with the groove that is complementary with said anti-drop block; The degree of depth of said groove is more than or equal to the height of said anti-drop block, and anti-drop block links to each other with said bottom portion of groove through flexible member, and the sidewall of said overlap joint hole/overlap joint groove is provided with the anticreep hole that is complementary with said anti-drop block;
Further; Said anti-drop device comprises the anticreep hole that is arranged on said center bit both sides and is arranged on said overlap joint hole/overlap joint groove sidewall and the anti-drop block that matches with said anticreep hole that said anti-drop block is installed on said overlap joint hole/overlap joint groove sidewall through flexible member;
Further, the contact surface in said anti-drop block and said anticreep hole is the curved surface of evagination with respect to said anti-drop block.
The invention allows for a kind of screen casing and transfer method, comprise the steps:
1) adopts the comprehensive Drilling bore bit boring of aforesaid large through-hole open and close type, and be the hollow columnar structures that is complementary with said outer drill bit with the matching used drilling rod of the comprehensive Drilling bore bit of this large through-hole open and close type;
2) at the bottom of the inner via hole arrival hole of screen casing via drilling rod and drill bit;
3) keep the screen casing position motionless, withdraw from comprehensive Drilling bore bit of said large through-hole open and close type and supporting drilling rod.
Further, in the said step 1), adopt the boring of the comprehensive Drilling bore bit of said large through-hole open and close type before, the free end with said center bit is fixed in said overlap joint hole/overlap joint groove through said anti-drop device earlier;
Further, said step 2) in, when screen casing was transferred to said center bit place, screen casing acted on the restraint forces that axial force on the center bit overcomes anti-drop device, and said center bit rotates and finally places in said installing hole/mounting groove around bearing pin.
Beneficial effect of the present invention is:
1, the comprehensive Drilling bore bit of large through-hole open and close type of the present invention is the outer drill bit of hollow columnar structures and is hingedly mounted on the center bit in the outer drill bit through setting, and in boring procedure, center bit receives the axial force towards the aperture from coal column and center bit is fixed outside on the drill bit; And creep into outer drill bit; Behind the pore-forming, screen casing via the inner via hole of drilling rod and drill bit to center bit, and to the axial force of center bit effect at the bottom of the hole; After overcoming the restraint forces of anti-drop device; Make center bit rotate also and finally place installing hole/mounting groove, screen casing can continue to transfer, up to suitable depth location around bearing pin; Therefore; The comprehensive Drilling bore bit of large through-hole open and close type of the present invention not only can be holed on weak seam, and needn't carry brill behind the pore-forming and can directly transfer screen casing, can effectively avoid collapsing and causing screen casing to transfer the defective that the degree of depth is not enough even can't transfer owing to boring; In addition; The inner via hole of the comprehensive Drilling bore bit of large through-hole open and close type of the present invention can be provided with enough greatly according to actual needs; And through being provided with and the matching used drilling rod of this drill bit, can realize external diameter is transferred smaller or equal to the screen casing of drill bit inner via hole, the external diameter of the screen casing of promptly transferring can be bigger;
2, be set to comprise the multistage drill bit structure of one-level drill bit at least through outer drill bit, not only can realize that the comprehensive of drill bit creeps into, and can safeguard that hole wall is stable, reduce borehole throw;
3, through anti-drop device being set at center bit free end and overlap joint between hole/overlap joint groove, can avoid before boring center bit arbitrarily to rotate around bearing pin influences drill bit and creeps into.
Description of drawings
Fig. 1 is the comprehensive Drilling bore bit first example structure sketch map of large through-hole open and close type of the present invention;
Fig. 2 is the A-A sectional view of Fig. 1;
Fig. 3 is the C detail drawing of Fig. 2;
Fig. 4 is the comprehensive Drilling bore bit second example structure sketch map of large through-hole open and close type of the present invention;
Fig. 5 is the B-B sectional view of Fig. 4;
Fig. 6 is the D detail drawing of Fig. 5;
Fig. 7 is comprehensive Drilling bore bit the 3rd example structure sketch map of large through-hole open and close type of the present invention;
Fig. 8 is the E-E sectional view of Fig. 7;
Fig. 9 is the F detail drawing of Fig. 8.
The specific embodiment
Elaborate below in conjunction with the accompanying drawing specific embodiments of the invention.
First embodiment
As shown in Figure 1, be the comprehensive Drilling bore bit first example structure sketch map of large through-hole open and close type of the present invention; Fig. 2 is the A-A sectional view of Fig. 1.The comprehensive Drilling bore bit of large through-hole open and close type of present embodiment comprises outer drill bit that is hollow columnar structures and the center bit 3 that is installed in the outer drill bit; Offer the installing hole 4 that extends and be used to hold center bit 3 along its centerline direction on the said outer drill bit one side periphery wall; Said outer drill bit and this installing hole 4 relative opposite side periphery walls are provided with overlap joint groove 5; The fixed end of said center bit 3 is hinged on the bottom of said installing hole 4 through bearing pin 6; The free end of said center bit 3 is fixed in the overlap joint groove 5 through anti-drop device; The physical dimension of said installing hole 4 is more than or equal to the physical dimension of said center bit 3 correspondences; The height of overlap joint groove 5 is as the criterion not interfere center bit 3, and said center bit 3 overcomes anti-drop device under responsive to axial force restraint forces be that the rotating shaft rotation also can place in the said installing hole 4 with bearing pin 6, is equipped with cutter head 7 on said outer drill bit and the center bit 3.Said center bit 3 can adopt multiple structure, and for cuboid or said center bit are provided with drill end bulge-structure outside said, the center bit 3 of present embodiment is a rectangular structure like center bit 3.
Preferably, said outer drill bit is and comprises the multistage drill bit structure of one-level drill bit at least, and is lower than compared to this internal layer drill bit farther outer drill end of bit central outside said near the top of the internal layer drill bit of said outer bit central.The outer drill bit of present embodiment is the two-stage drill bit structure, and comprises outer drill bit 1 and internal layer drill bit 2, and said internal layer drill bit 2 is positioned at outer drill bit 1; And internal layer drill bit 2 tops are lower than outer drill bit 1 top, are set to comprise through outer drill bit and the two-stage drill bit structure of outer drill bit 1 and internal layer drill bit 2 not only can realize that the comprehensive of drill bit creeps into; And can safeguard that hole wall is stable; Reduce borehole throw, the outer drill bit 1 of present embodiment and the double-layer structure of internal layer drill bit 2 for being fixed together, and outer drill bit 1 is sleeved on the internal layer drill bit 2; The degree of depth of overlap joint groove 5 equals the wall thickness of internal layer drill bit 2, adopts the outer drill bit of this structure to be convenient to processing and manufacturing.
The outer drill bit that the comprehensive Drilling bore bit of large through-hole open and close type of present embodiment is hollow columnar structures through setting be hingedly mounted on the center bit 3 in the outer drill bit, in boring procedure, center bit 3 receives from coal column on the axial force of aperture direction is fixed center bit 3 outside drill bit; And creep into outer drill bit, behind the pore-forming, screen casing via the inner via hole of drilling rod and drill bit to center bit; When screen casing is transferred to center bit 3 places; To the axial force of center bit 3 effect at the bottom of the hole, overcome the restraint forces of anti-drop device after, make center bit 3 around bearing pin 6 rotations and finally place installing hole 4; Screen casing can continue to extending below; Up to suitable depth location, therefore, the comprehensive Drilling bore bit of large through-hole open and close type of present embodiment not only can be holed on weak seam; And needn't carry brill behind the pore-forming and can directly transfer screen casing, can effectively avoid collapsing and causing screen casing to transfer the defective that the degree of depth is not enough even can't transfer owing to boring.In addition; The inner via hole of the comprehensive Drilling bore bit of large through-hole open and close type of present embodiment can be provided with enough greatly according to actual needs; And through being provided with and the matching used drilling rod of this drill bit, can realize external diameter is transferred smaller or equal to the screen casing of drill bit inner via hole, the external diameter of the screen casing of promptly transferring can be bigger.
Further improvement as technique scheme; Said anti-drop device comprises the anti-drop block 8 that is separately positioned on said center bit 3 both sides; As shown in Figure 3, said anti-drop block 8 links to each other with said center bit 3 through flexible member, and the sidewall of said overlap joint groove 5 is provided with the anticreep hole 9 that is complementary with said anti-drop block 8; Flexible member can adopt flexible members such as spring or elastic caoutchouc, and the anti-drop block 8 of present embodiment links to each other with center bit 3 through spring.Preferably, said anti-drop block 8 is the curved surface of evagination with the contact surface in said anticreep hole 9 with respect to this anti-drop block 8, adopts the anti-drop block 8 of this structure can prevent effectively that anti-drop device is stuck, and improves the reliability of device.Under spring action, anti-drop block 8 remains in the anticreep hole 9, can avoid influencing drill bit at center bit 3 around bearing pin 6 random rotations and creep into; When center drill bit 3 receives towards the axial force at the bottom of the hole; Spring is compressed, and anti-drop block 8 breaks away from anticreep hole 9, and center bit 3 can be around bearing pin 6 rotations.
Second embodiment
As shown in Figure 4, be the comprehensive Drilling bore bit second example structure sketch map of large through-hole open and close type of the present invention; Fig. 5 is the B-B sectional view of Fig. 4.The comprehensive Drilling bore bit of large through-hole open and close type of present embodiment comprises outer drill bit that is hollow columnar structures and the center bit 3 that is installed in the outer drill bit; Offer the mounting groove 10 that extends and be used to hold center bit 3 along generatrix direction on the said outer drill bit one side periphery wall; Said outer drill bit and this mounting groove 10 relative opposite side periphery walls are provided with overlap joint hole 11; The fixed end of said center bit 3 is hinged on the bottom of said mounting groove 10 through bearing pin 6; The free end of said center bit 3 is fixed in the overlap joint hole 11 through anti-drop device; The physical dimension of said mounting groove 10 is more than or equal to the physical dimension of said center bit 3 correspondences; The height in overlap joint hole 11 is as the criterion not interfere center bit 3; The height in the overlap joint hole 11 of present embodiment is lower than the height of mounting groove 10 but can interfere center bit 3 rotation, and said center bit 3 overcomes anti-drop device under responsive to axial force restraint forces be that the rotating shaft rotation also can place in the said mounting groove 10 with bearing pin 6, is equipped with cutter head 7 on said outer drill bit and the center bit 3.Said center bit 3 can adopt multiple structure, and for cuboid or said center bit are provided with drill end bulge-structure outside said, the center bit 3 of present embodiment is a rectangular structure like center bit 3.
Preferably; Said outer drill bit is and comprises the multistage drill bit structure of one-level drill bit at least; And be lower than compared to this internal layer drill bit farther outer drill end of bit central outside said near the top of the internal layer drill bit of said outer bit central; The outer drill bit of present embodiment is the one-level drill bit structure that comprises outer drill bit 1, can realize that the comprehensive of drill bit creeps into.
The outer drill bit that the comprehensive Drilling bore bit of large through-hole open and close type of present embodiment is hollow columnar structures through setting be hingedly mounted on the center bit 3 in the outer drill bit, in boring procedure, center bit 3 receives from coal column on the axial force of aperture direction is fixed center bit 3 outside drill bit; And creep into outer drill bit, behind the pore-forming, screen casing via the inner via hole of drilling rod and drill bit to center bit; When screen casing is transferred to center bit 3 places; To the axial force of center bit 3 effect at the bottom of the hole, overcome the restraint forces of anti-drop device after, make center bit 3 around bearing pin 6 rotations and finally place mounting groove 10; Screen casing can continue to transfer; Up to suitable depth location, therefore, the comprehensive Drilling bore bit of large through-hole open and close type of present embodiment not only can be holed on weak seam; And needn't carry brill behind the pore-forming and can directly transfer screen casing, can effectively avoid collapsing and causing screen casing to transfer the defective that the degree of depth is not enough even can't transfer owing to boring.In addition; The inner via hole of the comprehensive Drilling bore bit of large through-hole open and close type of present embodiment can be provided with enough greatly according to actual needs; And through being provided with and the matching used drilling rod of this drill bit, can realize external diameter is transferred smaller or equal to the screen casing of drill bit inner via hole, the external diameter of the screen casing of promptly transferring can be bigger.
Further improvement as technique scheme; Said anti-drop device comprises the anti-drop block 8 that is separately positioned on said center bit 3 both sides; As shown in Figure 6, the side of said center bit 3 is provided with the groove that is complementary with said anti-drop block 8, and the degree of depth of said groove is more than or equal to the height of said anti-drop block; And anti-drop block 8 links to each other with said bottom portion of groove through flexible member, and the sidewall in said overlap joint hole 11 is provided with the anticreep hole 9 that is complementary with said anti-drop block 8.Flexible member can adopt spring or elastic caoutchouc; Present embodiment is arranged in the groove of center bit 3 sides and is provided with elastic caoutchouc 12; Anti-drop block 8 links to each other with center bit 3 through elastic caoutchouc 12, and through groove is set, anti-drop block 8 can be crushed in the groove under the effect of external force; Promptly adopt the anti-drop device of present embodiment, center bit 3 can be provided with forr a short time with overlap joint hole 11 sidewall spacers.Preferably, the anticreep hole 9 that cooperates with said anti-drop block 8 is the curved surface of indent, can prevent that anti-drop block 8 is stuck in groove.
Through anti-drop device is set; Under spring action, anti-drop block 8 remains in the anticreep hole 9, can avoid center bit 3 to influence drill bit around bearing pin 6 random rotations and creep into; When center drill bit 3 receives towards the axial force at the bottom of the hole; Elastic caoutchouc is compressed, and anti-drop block 8 breaks away from anticreep hole 9, and center bit 3 can be around bearing pin 6 rotations.
The 3rd embodiment
As shown in Figure 7, be comprehensive Drilling bore bit the 3rd example structure sketch map of large through-hole open and close type of the present invention; Fig. 8 is the E-E sectional view of Fig. 7.The comprehensive Drilling bore bit of large through-hole open and close type of present embodiment comprises outer drill bit that is hollow columnar structures and the center bit 3 that is installed in the outer drill bit; Offer the installing hole 4 that is used to hold center bit 3 on the said outer drill bit one side periphery wall; Said outer drill bit and this installing hole 4 relative opposite side periphery walls are provided with overlap joint hole 11; The fixed end of said center bit 3 is hinged on the bottom of said installing hole 4 through bearing pin 6; The free end of said center bit 3 is fixed in the overlap joint hole 11 through anti-drop device; The physical dimension of said installing hole 4 is more than or equal to the physical dimension of said center bit 3 correspondences; The height in overlap joint hole 11 is as the criterion not interfere center bit 3, and said center bit 3 overcomes anti-drop device under responsive to axial force restraint forces be that the rotating shaft rotation also can place in the said installing hole 4 with bearing pin 6, is equipped with cutter head 7 on said outer drill bit and the center bit 3.Said center bit 3 can adopt multiple structure, and for cuboid or said center bit are provided with drill end bulge-structure outside said, the center bit 3 of present embodiment is a rectangular structure like center bit 3.
Preferably, said outer drill bit is and comprises the multistage drill bit structure of one-level drill bit at least, and is lower than compared to this internal layer drill bit farther outer drill end of bit central outside said near the top of the internal layer drill bit of said outer bit central.The outer drill bit of present embodiment is three grades of drill bit structures; Be respectively outer drill bit 1, middle level drill bit 1.5 and internal layer drill bit 2 from outside to inside; And said outer drill bit 1, middle level drill bit 1.5 and internal layer drill bit 2 are fixed together, and the top of said internal layer drill bit 2 is lower than the top of middle level drill bit 1.5, and drill bit 1.5 tops in middle level are lower than outer drill bit 1 top; Be set to comprise three grades of drill bit structures of outer drill bit 1, middle level drill bit 1.5 and internal layer drill bit 2 through outer drill bit; Not only can realize that the comprehensive of drill bit creeps into, and can safeguard that hole wall is stable, reduce borehole throw.
The outer drill bit that the comprehensive Drilling bore bit of large through-hole open and close type of present embodiment is hollow columnar structures through setting be hingedly mounted on the center bit 3 in the outer drill bit, in boring procedure, center bit 3 receives from coal column on the axial force of aperture direction is fixed center bit 3 outside drill bit; And creep into outer drill bit, behind the pore-forming, screen casing via the inner via hole of drilling rod and drill bit to center bit; When screen casing is transferred to center bit 3 places; To the axial force of center bit 3 effect at the bottom of the hole, overcome the restraint forces of anti-drop device after, make center bit 3 around bearing pin 6 rotations and finally place installing hole 4; Screen casing can continue to extending below; Up to suitable depth location, therefore, the comprehensive Drilling bore bit of large through-hole open and close type of present embodiment not only can be holed on weak seam; And needn't carry brill behind the pore-forming and can directly transfer screen casing, can effectively avoid collapsing and causing screen casing to transfer the defective that the degree of depth is not enough even can't transfer owing to boring.In addition; The inner via hole of the comprehensive Drilling bore bit of large through-hole open and close type of present embodiment can be provided with enough greatly according to actual needs; And through being provided with and the matching used drilling rod of this drill bit, can realize external diameter is transferred smaller or equal to the screen casing of drill bit inner via hole, the external diameter of the screen casing of promptly transferring can be bigger.
Further improvement as technique scheme; Said anti-drop device comprises the anti-drop block 8 that is separately positioned on said center bit 3 both sides; As shown in Figure 9, said anti-drop block 8 links to each other with the sidewall in said overlap joint hole 11 through flexible member, and said center bit 3 is provided with the anticreep hole 9 that is complementary with said anti-drop block 8; Flexible member can adopt flexible members such as spring or elastic caoutchouc, and the anti-drop block 8 of present embodiment links to each other through the sidewall of spring with overlap joint hole 11.Preferably, said anti-drop block 8 is the curved surface of evagination with the contact surface in said anticreep hole 9 with respect to this anti-drop block 8, adopts the anti-drop block 8 of this structure can prevent effectively that anti-drop device is stuck, and improves the reliability of device.Through anti-drop device is being set; Under spring action, anti-drop block 8 remains in the anticreep hole 9, can avoid center bit 3 to influence drill bit around bearing pin 6 random rotations and creep into; When center drill bit 3 receives towards the axial force at the bottom of the hole; Spring is compressed, and anti-drop block 8 breaks away from anticreep hole 9, and center bit 3 can be around bearing pin 6 rotations.
The specific embodiment of transferring method in the face of screen casing of the present invention down describes.
The method of transferring the screen casing of present embodiment adopts the comprehensive Drilling bore bit of the described large through-hole open and close type of first embodiment, comprises the steps:
1) adopts the comprehensive Drilling bore bit boring of aforesaid large through-hole open and close type, and be the hollow columnar structures that is complementary with said outer drill bit with the matching used drilling rod of the comprehensive Drilling bore bit of this large through-hole open and close type;
2) at the bottom of the inner via hole arrival hole of screen casing via drilling rod and drill bit;
3) keep the screen casing position motionless, withdraw from comprehensive Drilling bore bit of said large through-hole open and close type and supporting drilling rod.
Because comprehensive Drilling bore bit of large through-hole open and close type and drilling rod are equipped with the centre bore that is complementary with screen casing; Behind the pore-forming; Screen casing can directly insert in the centre bore of drilling rod and to the suitable degree of depth; And then withdraw from drill bit and drilling rod, can effectively avoid collapsing and causing screen casing to transfer the defective that the degree of depth is not enough even can't transfer owing to boring.
Further; In the said step 1); Before adopting the comprehensive Drilling bore bit boring of said large through-hole open and close type; Free end with said center bit 3 is fixed in the overlap joint groove 5 through said anti-drop device earlier, prevents that center bit 3 from rotating in the installing hole 4 when boring, causes coal column to enter into the inner via hole of drill bit and drilling rod.
Further, said step 2) in, when screen casing extended to said center bit 3 places, screen casing acted on the restraint forces that axial force on the center bit 3 overcomes anti-drop device, and said center bit 3 is around bearing pin 6 rotations and finally place in the said installing hole 4.Transfer drilling rod place, center at the bottom of the hole via the drilling rod inner via hole, apply axial force through screen casing to the center drilling rod, center drilling rod rotation back drill bit inner via hole is opened, and screen casing arrives drill end.
Adopting screen casing behind the comprehensive Drilling bore bit pore-forming of large through-hole open and close type of above-mentioned second embodiment and the 3rd embodiment to transfer method and the screen casing of present embodiment, to transfer method identical, tired no longer one by one stating.
Explanation is at last; Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although with reference to preferred embodiment the present invention is specified, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention; And not breaking away from the aim and the scope of technical scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1. comprehensive Drilling bore bit of large through-hole open and close type; It is characterized in that: comprise outer drill bit that is hollow columnar structures and the center bit that is installed in the outer drill bit; Offer the installing hole/mounting groove that is used to hold center bit on the said outer drill bit one side periphery wall; The opposite side periphery wall that said outer drill bit is relative with this installing hole/mounting groove is provided with overlap joint hole/overlap joint groove; The fixed end of said center bit is hinged on the bottom of said installing hole/mounting groove through bearing pin; The free end of said center bit is fixed in overlap joint hole/overlap joint groove through anti-drop device; The physical dimension of said installing hole/mounting groove is more than or equal to the corresponding physical dimension of said center bit, and said center bit overcomes anti-drop device under responsive to axial force restraint forces is the rotating shaft rotation with the bearing pin and places in said installing hole/mounting groove, is equipped with cutter head on said outer drill bit and the center bit.
2. the comprehensive Drilling bore bit of large through-hole open and close type according to claim 1; It is characterized in that: said outer drill bit is to comprise the multistage drill bit structure of one-level drill bit at least, and is lower than compared to this internal layer drill bit farther outer drill end of bit central outside said near the internal layer drill end of said outer bit central.
3. the comprehensive Drilling bore bit of large through-hole open and close type according to claim 1 is characterized in that: said center bit is that cuboid or said center bit are provided with drill end bulge-structure outside said.
4. the comprehensive Drilling bore bit of large through-hole open and close type according to claim 1; It is characterized in that: said anti-drop device comprises the anti-drop block that is separately positioned on said center bit both sides; Said anti-drop block links to each other with said center bit through flexible member, and the sidewall of said overlap joint hole/overlap joint groove is provided with the anticreep hole that is complementary with said anti-drop block.
5. the comprehensive Drilling bore bit of large through-hole open and close type according to claim 1; It is characterized in that: said anti-drop device comprises the anti-drop block that is separately positioned on said center bit both sides; The side of said center bit is provided with the groove that is complementary with said anti-drop block; The degree of depth of said groove is more than or equal to the height of said anti-drop block, and anti-drop block links to each other with said bottom portion of groove through flexible member, and the sidewall of said overlap joint hole/overlap joint groove is provided with the anticreep hole that is complementary with said anti-drop block.
6. the comprehensive Drilling bore bit of large through-hole open and close type according to claim 1; It is characterized in that: said anti-drop device comprises the anticreep hole that is arranged on said center bit both sides and is arranged on said overlap joint hole/overlap joint groove sidewall and the anti-drop block that matches with said anticreep hole that said anti-drop block is installed on said overlap joint hole/overlap joint groove sidewall through flexible member.
7. according to claim 4 or the comprehensive Drilling bore bit of 5 or 6 described large through-hole open and close types, it is characterized in that: the contact surface in said anti-drop block and said anticreep hole is the curved surface of evagination with respect to said anti-drop block.
8. a screen casing is transferred method, it is characterized in that: comprise the steps:
1) adopts like the comprehensive Drilling bore bit boring of described large through-hole open and close type of claim 1-7, and be the hollow columnar structures that is complementary with said outer drill bit with the matching used drilling rod of the comprehensive Drilling bore bit of this large through-hole open and close type;
2) at the bottom of the inner via hole arrival hole of screen casing via drilling rod and drill bit;
3) keep the screen casing position motionless, withdraw from comprehensive Drilling bore bit of said large through-hole open and close type and supporting drilling rod.
9. the screen casing of stating is according to Claim 8 transferred method; It is characterized in that: in the said step 1); Before adopting the comprehensive Drilling bore bit boring of said large through-hole open and close type, the free end with said center bit is fixed in said overlap joint hole/overlap joint groove through said anti-drop device earlier.
10. the screen casing of stating is according to Claim 8 transferred method; It is characterized in that: said step 2); When screen casing is transferred to said center bit place; Screen casing acts on the restraint forces that axial force on the center bit overcomes anti-drop device, and said center bit rotates and finally places in said installing hole/mounting groove around bearing pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110384503XA CN102561952A (en) | 2011-11-28 | 2011-11-28 | Large-through-hole opening type all-dimensional drilling bit and sieve tube lowering method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110384503XA CN102561952A (en) | 2011-11-28 | 2011-11-28 | Large-through-hole opening type all-dimensional drilling bit and sieve tube lowering method thereof |
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| CN102561952A true CN102561952A (en) | 2012-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110384503XA Pending CN102561952A (en) | 2011-11-28 | 2011-11-28 | Large-through-hole opening type all-dimensional drilling bit and sieve tube lowering method thereof |
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| CN109681152A (en) * | 2018-12-11 | 2019-04-26 | 河南工程学院 | A kind of projecting coal bed aperture guard device and its screen casing pay-off method |
| CN113236127A (en) * | 2021-05-13 | 2021-08-10 | 中煤科工集团西安研究院有限公司 | Construction device and method for hydraulic punching while drilling and sieve tube hole protection |
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Inventor after: Wang Yihong Inventor after: Wang Qingfeng Inventor after: Diao Wenqing Inventor after: Cui Gangming Inventor after: Peng Lamei Inventor after: Li Yanming Inventor after: Chen Yu Inventor after: Kong Wei Inventor before: Wang Yihong |
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Application publication date: 20120711 |