WO2020034364A1 - 一种取芯钻机液道启动机构 - Google Patents

一种取芯钻机液道启动机构 Download PDF

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Publication number
WO2020034364A1
WO2020034364A1 PCT/CN2018/109034 CN2018109034W WO2020034364A1 WO 2020034364 A1 WO2020034364 A1 WO 2020034364A1 CN 2018109034 W CN2018109034 W CN 2018109034W WO 2020034364 A1 WO2020034364 A1 WO 2020034364A1
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Prior art keywords
section
shear pin
hole
outflow
inflow
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PCT/CN2018/109034
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English (en)
French (fr)
Inventor
陈领
谢和平
高明忠
张志龙
张茹
张泽天
鲁义强
李聪
何志强
华夏
明传剑
彭高友
陆彤
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四川大学
深圳大学
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Application filed by 四川大学, 深圳大学 filed Critical 四川大学
Publication of WO2020034364A1 publication Critical patent/WO2020034364A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/40—Safety valves; Equalising valves, e.g. pressure relief valves with a fracturing member, e.g. fracturing diaphragm, glass, fusible joint
    • F16K17/403—Safety valves; Equalising valves, e.g. pressure relief valves with a fracturing member, e.g. fracturing diaphragm, glass, fusible joint with a fracturing valve member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/40—Safety valves; Equalising valves, e.g. pressure relief valves with a fracturing member, e.g. fracturing diaphragm, glass, fusible joint
    • F16K17/406—Safety valves; Equalising valves, e.g. pressure relief valves with a fracturing member, e.g. fracturing diaphragm, glass, fusible joint the fracturing member being a generally elongated member, e.g. rod or wire, which is directly connected to a movable valve member, the breaking or buckling of the elongated member allowing the valve member to move to a closed or open position

Definitions

  • the invention relates to a drilling core system, in particular to a liquid channel starting mechanism of a core drilling machine.
  • cores are important data for discovering oil and gas layers and studying formations, oil layers, reservoirs, caps, structures, etc. By observing and studying cores, you can directly understand the lithology and physical properties of underground rocks. And oily, gas, aquatic characteristics.
  • Coring is the use of special coring tools to pull underground rocks into the ground during drilling. This type of rock is called a core, which can be used to determine various properties of the rock and intuitively study the underground structure. And rock sedimentary environment, and understand the fluid properties. In the process of mineral exploration and development, it is necessary to carry out drilling according to the stratigraphic level and depth of the geological design, run core tools into the well, and drill out the rock samples.
  • the underground temperature is high and electrical equipment cannot be used. Hydraulic equipment is often used. Before the hydraulic equipment is started, the liquid flow channel must be blocked. After startup, the liquid flow channel should be unblocked, provide hydraulic pressure to the working parts, drive the hydraulic motor, and cool the drill bit. .
  • the invention aims to provide a core channel drilling machine liquid channel starting mechanism, which blocks the liquid flow channel before starting and provides hydraulic pressure to the working parts after starting.
  • the fluid channel starting mechanism of the core drilling rig disclosed in the present invention comprises a lock body, a locking lever, a shear pin, and a center rod.
  • the lock body penetrates back and forth, and the lock body is a locking section, a sealing section and a fluid channel section from back to front.
  • the side wall of the locking section is provided with shear pin holes, the shear pin holes are through holes, the locking rod penetrates back and forth, the locking rod is inside the lock body, and the locking rod is connected, outflow, closed, and inflow sections from back to front in order to connect
  • the outer wall of the segment has a groove, and the length of the shear pin is greater than the depth of the shear pin hole on the side wall of the lock body.
  • the shear pin is in the shear pin hole and the groove.
  • the center rod is in the lock rod
  • the inner diameter of the sealing section is equal to the outer diameter of the closed section
  • the inner diameter of the liquid channel section is greater than the outer diameter of the lock rod
  • the inner diameters of the connection section, outflow section and inflow section are larger than the center
  • the outer diameter of the rod, the inner diameter of the closed section is equal to the outer diameter of the center rod
  • the axial distance from the front end of the sealing section to the rear end of the lock body is smaller than the axial distance from the front end of the closed section to the rear end of the lock body.
  • the cavity communicates through the inflow hole, and the shear pin passes through the shear pin hole and is inserted into the groove Outflow hole to lock the rear end opening of the outer wall is less than the axial distance from the rear end section of the fluid channel to the rear end of the axial distance from the lock body.
  • the inner diameter of the locking section is larger than the inner diameter of the sealing section
  • the outer wall of the connecting section has a convex portion
  • the outer diameter of the convex portion is greater than the inner diameter of the sealing section
  • the outer diameter of the front of the convex portion of the connecting section is equal to the inner diameter of the sealing section
  • the groove In the raised part
  • outflow hole is inclined forward from the inside to the outside.
  • inflow holes there are multiple inflow holes, and the inflow holes are distributed back and forth on different sides.
  • connecting section is threadedly connected to the outflow section, and the closed section and the inflow section are welded.
  • the lock nut is behind the lock body, the lock nut penetrates back and forth, the center rod passes through the inner cavity of the lock nut, the front end of the lock nut is threadedly connected to the back end of the lock body, and the shear pin hole is opened at At the thread at the rear end of the lock body, the radial distance from the inner wall of the lock nut to the bottom of the groove is not less than the length of the shear pin.
  • the lock nut includes a fixed section and a threaded section.
  • the outer diameter of the convex portion behind the connecting section is smaller than the inner diameter of the fixed section and smaller than the outer diameter of the raised portion.
  • the inner diameter of the threaded section is equal to the outer diameter of the locking section.
  • the shear pin head includes a large head and a small head, the large head is outward, and the outer diameter of the large head is greater than the outer diameter of the small head.
  • the shear pin hole includes an outer section and an inner section, and the diameter of the outer section is not less than the outer diameter of the big head of the shear pin head.
  • the bore diameter of the inner section is not smaller than the outer diameter of the small head of the shear pin head, the bore diameter of the inner section is smaller than the outer diameter of the big head, the depth of the outer section is not less than the length of the big head, and the sum of the lengths of the small head and the end of the shear pin is greater than the depth of the inner section.
  • the lock nut is provided with a lock hole A in the axial direction, the lock hole A is a shear pin hole, the rear end face of the lock body has a lock hole B, the lock hole B is a blind hole, and the lock hole A Paired with the locking hole B, it also includes a fixing screw.
  • the length of the fixing screw is greater than the depth of the locking hole A.
  • the fixing screw is in the locking hole A. The front end of the fixing screw passes through the locking hole A and is inserted into the locking hole B.
  • the shear pin fixes the lock lever, the outflow hole is in the sealing section, the opening of the outer wall of the outflow hole is sealed, and the liquid cannot flow out.
  • the hydraulic pressure provided by the rear mud pump reaches the starting value, the shear pin is broken and the lock lever moves forward.
  • the liquid flows through the outer wall of the center rod and the inner wall of the connecting section and the inner wall of the outlet section through the outflow hole into the liquid channel formed by the inner wall of the liquid channel section and the outer wall of the inflow section.
  • the liquid flow channel formed on the inner wall of the section is in communication with the front hydraulic motor and the drill bit, and the hydraulic motor is started to cool the drill bit;
  • the outer diameter of the raised part is larger than the inner diameter of the sealing section, and the forward movement distance of the lock lever is limited so that the lock lever can no longer move forward after reaching the working position;
  • Locking hole A, locking hole B and fixing screws cooperate to limit the circumferential rotation
  • the shear pin head includes a large head and a small head, and the shear pin hole includes an outer section and an inner section, which can restrict the shear pin to move radially inward.
  • FIG. 1 is a schematic diagram before starting the present invention
  • FIG. 2 is a schematic diagram after the invention is started
  • the liquid core starting mechanism of the core drilling rig disclosed in the present invention includes a lock body 3, which is penetrated back and forth, and the lock body 3 is a lock section 31, a seal section 32 and a fluid channel section 33 from back to front.
  • the shear pin holes are through holes, and also include a lock lever 2 which penetrates back and forth, the lock lever 2 is in the lock body 3, and the lock lever 2 is in order from back to front.
  • the connection section 21 is threadedly connected to the outflow section 22.
  • the closed section 23 and the inflow section 23 are welded.
  • the outer wall of the connection section 21 has a groove 212, and the groove 212 is an annular groove.
  • the shear pin 5 is longer than the depth of the shear pin hole.
  • the shear pin 5 is in the shear pin hole and the groove 212.
  • the outflow section 22 has an outflow hole 221 on the side wall.
  • the outflow hole 221 is inclined outward from the inside.
  • a plurality of outflow holes 221 are evenly distributed along the radial circumference.
  • the inflow holes 241 are distributed back and forth on different sides of the inflow section 24.
  • the inner diameter of the sealing section 32 is equal to the outer diameter of the closed section 23 and the outer diameter of the outflow section 22,
  • the inner diameter of the track section 33 is larger than the outer diameter of the locking rod 2
  • the inner diameter of the connecting section 21, the outflow section 22 and the inflow section 24 is larger than the outer diameter of the center rod 1
  • the inner diameter of the closed section 23 is equal to the outer diameter of the center rod 1
  • the axial distance at the rear end is smaller than the axial distance from the front end of the closed section 23 to the rear end of the lock body 3.
  • the inner wall of the liquid passage section 33 and the outer wall of the inflow section 24 form a liquid passage section cavity 72, and the inner wall of the inflow section 24 and the outer wall of the center rod 1 form Inner section inner cavity 73, the outer wall of the center rod 1 and the inner section of the outflow section 22 and the inner wall of the connecting section 21 surround the outflow section inner cavity 71.
  • the outer wall of the connecting section 21 has a convex portion 211
  • the outer diameter of the convex portion 211 is larger than the inner diameter of the sealing section 32
  • the outer diameter of the convex portion 211 of the connecting section 21 is equal to the inner diameter of the sealing section 32
  • the groove 212 is convex
  • the part 211 further includes a lock nut 4, the lock nut 4 is behind the lock body 3, the lock nut 4 penetrates forward and backward, the center rod 1 passes through the inner cavity of the lock nut 4, and the front end of the lock nut 4 and the rear end of the lock body 3 Thread connection, the shear pin hole is opened at the thread at the rear end of the lock body 3, the radial direction from the inner wall of the lock nut 4 to the bottom of the groove 212
  • the length is not less than the length of the shear pin 5.
  • the lock nut 4 includes a fixed section and a threaded section.
  • the outer diameter of the convex section 211 behind the connecting section 21 is smaller than the inner diameter of the fixed section and smaller than the outer diameter of the raised section 211.
  • the inner diameter of the threaded section is equal to the outer diameter of the locking section 31.
  • the lock nut 4 is provided with a locking hole A in the axial direction, the locking hole A is a shear pin hole, the rear end of the lock body 3 has a locking hole B, the locking hole B is a blind hole, the locking hole A and the locking hole B pairing also includes a fixing screw 6, the length of the fixing screw 6 is greater than the depth of the locking hole A, the fixing screw 6 is in the locking hole A, and the front end of the fixing screw 6 passes through the locking hole A and is inserted into the locking hole B.
  • the shear pin 5 penetrates the shear pin hole into the groove 212, and the axial distance from the outer wall of the outflow hole 221 to the rear end of the lock body 3 is smaller than the axial distance from the rear end of the liquid passage section 33 to the rear end of the lock body 3.
  • the outflow hole 221 The opening of the outer wall is closed by the sealing section 32, and the liquid cannot flow forward.
  • the hydraulic pressure provided by the rear mud pump reaches the starting value, it impacts the rear end of the lock lever 2 and cuts off the shear pin 5.
  • the shear pin 5 is broken into the shear pin head 51 and the shear pin.
  • Shear pin head 51 includes big head and small head, with the big head facing outward, the outer diameter of the big head is larger than the outer diameter of the small head. Diameter, the diameter of the inner section is smaller than the outer diameter of the big head, the depth of the outer section is not less than the length of the big head, and the sum of the length of the small head and the shear pin tail 52 is greater than the depth of the inner section.
  • the outer diameter of the convex section 211 of the connecting section 21 is 56mm, the inner diameter is 36mm, and the total length is 106mm.
  • the outer diameter of the convex section 211 of the connecting section 21 is 50mm in front and rear, and the groove 212 is 6mm deep.
  • the rear end of the convex section 211 is connected to the distance.
  • the rear end of the segment 21 is 15mm
  • the front end of the groove 212 is 27.8mm from the rear end of the connection segment
  • the width of the groove 212 is 5.5mm
  • the front end of the groove 212 is 73mm from the front end of the connection segment 21, and a through hole with an aperture of 8mm is also formed on the side wall of the connection segment 21.
  • the center of the through hole is 65mm from the front end of the connection section 21, the outer diameter of the thread at the front end of the connection section 21 is 43mm, the thread is M45 ⁇ 1.5mm, and the length of the thread connection between the connection section 21 and the outflow section 22 is 39mm.
  • the outflow section 22 and the closed section 23 both have an outer diameter of 50mm, the inner diameter of the outflow section 22 is 36mm, the diameter of the outflow hole 221 is 8mm, the angle between the outflow hole 221 and the axial direction is 45 °, and the front end of the outer wall opening of the outflow hole 221 is away from the outflow section 22
  • the end is 152mm, there are 6 outflow holes 221, the total length of the outflow section 22 and the closed section 23 is 196mm, the inner diameter of the closed section 23 is 25mm, the diameter of the inflow hole 241 is 16mm, there are 4 inflow holes 241, respectively on 4 sides, 4 inflows
  • the distance from the center of the hole 241 to the rear end of the inflow section 24 is 39mm, 55mm, 71mm, and 87mm, the inner diameter of the inflow section 24 is 40.5mm, the outer diameter of the inflow section 24 is 44.5mm, and the outer diameter of the center rod 1 is 25mm.
  • the locking section 31 has an outer diameter of 82mm and an inner diameter of 56mm.
  • the center of the shear pin hole is 8mm from the rear end of the locking section 31.
  • the locking section 31 is 56mm long.
  • the outer diameter of the shear pin hole is 8mm, the depth is 5mm, and the inner diameter is 5mm.
  • the depth It is 8mm, the outer diameter of the sealing section 32 is 99.6mm, the inner diameter is 50mm, the sealing section 32 is 176mm long, and the inner diameter of the liquid passage section 33 is 70mm.
  • the total length of the shear pin 5 is 16.5mm, the length of the shear pin head 51 is 3.5mm, the outer diameter is 7mm, the diameter of the shear pin head 51 small head is 4.8mm, and the sum of the length of the shear pin head 51 and the shear pin tail 52 is 13mm.

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  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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Abstract

一种取芯钻机液道启动机构，包括锁体(3)、锁定杆(2)、剪销(5)、中心杆(1)，锁体(3)从后至前依次为锁定段(31)、密封段(32)和液道段(33)，锁定段(31)侧壁有剪销孔，锁定杆(2)在锁体(3)内，锁定杆(2)从后至前依次为连接段(21)、流出段(22)、封闭段(23)和流入段(24)，连接段(21)外壁有凹槽(212)，剪销(5)在剪销孔和凹槽(212)内，流出段(22)侧壁开有流出孔(221)，流入段(24)侧壁开有流入孔(241)，中心杆(1)在锁定杆(2)内，液道段内腔(72)与流入段内腔(73)通过流入孔(241)连通，启动前，剪销(5)穿过剪销孔嵌入凹槽(212)，流出孔(221)外壁开口封闭，启动后，锁定杆(2)前移，剪销(5)剪断，剪销(5)头在剪销孔内，剪销(5)尾在凹槽内，流出段内腔(71)与液道段内腔(72)通过流出孔(221)连通。该取芯钻机液道启动机构，启动前，阻断液体流道，启动后，向工作部件提供液压。

Description

一种取芯钻机液道启动机构 技术领域
本发明涉及钻井取芯系统，尤其涉及一种取芯钻机液道启动机构。
背景技术
在油田勘探过程中，岩芯是发现油气层和研究地层、生油层、储油层、盖层、构造等的重要资料，通过对岩芯的观察研究，可以直接地了解地下岩层的岩性、物性和含油、气、水产状特征。油田投入开发后，要通过岩芯进一步研究和认识油层沉积特征，储层的物性、孔隙结构、润湿性、相对渗透率、岩相特征，油层物理模拟和油层水淹规律；认识和掌握不同开发阶段、不同含水阶段油层水淹特征，搞清剩余油分布，为油田开发方案设计，层系、井网调整和加密井提供科学依据。
取岩芯是在钻井过程中使用特殊的取芯工具把地下岩石成块地取到地面上来，这种成块的岩石叫做岩芯，通过它可以测定岩石的各种性质，直观地研究地下构造和岩石沉积环境，了解其中的流体性质等。在矿产勘探和开发过程中，需要按地质设计的地层层位和深度，开展钻进工作，向井内下入取芯工具，钻取出的岩石样品。
井下温度高，电气设备无法使用，常使用液压设备，液压设备启动前，需阻断液体流道，启动后，应使液体流道畅通，向工作部件提供液压，驱动液压马达，冷去钻机钻头。
发明内容
本发明旨在提供一种取芯钻机液道启动机构，启动前，阻断液体流道，启动后，向工作部件提供液压。
为达到上述目的，本发明采用的技术方案如下：
本发明公开的取芯钻机液道启动机构，包括锁体、锁定杆、剪销、中心杆，所述锁体前后贯通，锁体从后至前依次为锁定段、密封段和液道段，锁定段侧壁有剪销孔，剪销孔为通孔，所述锁定杆前后贯通，锁定杆在锁体内，锁定杆从后至前依次为连接段、流出段、封闭段和流入段，连接段外壁有凹槽，所述剪销长度大于锁体侧壁上的剪销孔深度，所述剪销在剪销孔和凹槽内，流出段侧壁开有流出孔，流入段侧壁开有流入孔，所述中心杆在锁定杆内，所述密封段内径等于封闭段外径，所述液道段内径大于锁定杆外径，所述连接段、流出段和流入段的内径大于中心杆外径，所述封闭段内径等于中心杆外径，所述密封段前端到锁体后端的轴向距离小于封闭段前端到锁体后端的轴向距离，液道段内腔与流入段内腔通过流入孔连通，剪销穿过剪销孔嵌入凹槽，流出孔外壁开口到锁体后端的轴向距离小于液道段后端到锁体后端的轴向距离。
进一步的，所述锁定段内径大于密封段内径，所述连接段外壁有凸起部，凸起部外径大于密封段内径，连接段凸起部前方外径等于密封段内径，所述凹槽在凸起部。
进一步的，所述流出孔由内向外向前倾斜。
进一步的，所述流出孔有多个，多个流出孔沿径向圆周均匀分布。
进一步的，所述流入孔有多个，流入孔在不同侧面前后分布。
进一步的，所述连接段与流出段螺纹连接，所述封闭段和流入段焊接。
进一步的，还包括锁紧螺母，锁紧螺母在锁体后方，锁紧螺母前后贯通，中心杆穿过锁紧螺母内腔，锁紧螺母前端与锁体后端螺纹连接，剪销孔开在锁体后端螺纹处，锁紧螺母内壁到凹槽底的径向距离不小于剪销长度。
进一步的，所述锁紧螺母包括固定段和螺纹段，连接段凸起部后方外径小于固定段内径小于凸起部外径，螺纹段内径等于锁定段外径。
进一步的，所述剪销头包括大头和小头，大头朝外，大头外径大于小头外径，所述剪销孔包括外段和内段，外段孔径不小于剪销头大头外径，内段孔径不小于剪销头小头外径，内段孔径小于大头外径，外段深度不小于大头长度，小头与剪销尾长度的和大于内段深度。
进一步的，所述锁紧螺母轴向开有锁紧孔A，所述锁紧孔A为剪销孔，锁体后端面有锁紧孔B，锁紧孔B为盲孔，锁紧孔A和锁紧孔B配对，还包括固定螺钉，固定螺钉长度大于锁紧孔A深度，固定螺钉在锁紧孔A内，固定螺钉前端穿过锁紧孔A嵌入锁紧孔B内。
本发明具有以下有益效果：
1、启动前，剪销固定锁定杆，流出孔在密封段，流出孔外壁开口被封死，液体为无法流出，当后方泥浆泵提供的液压达到启动值，冲断剪销，锁定杆前移，液体流经中心杆外壁与连接段内壁、出液段内壁形成的液体流道通过流出孔进入液道段内壁与流入段外壁形成的液体流道，在经流入孔流进中心杆外壁与流入段内壁形成的液体流道与前方液压马达和钻机钻头连通，启动液压马达，冷却钻机钻头；
2、凸起部外径大于密封段内径，限定锁定杆向前移动的距离，使锁定杆到达工作位置后不再向前移动；
3、设置锁紧螺母，锁紧螺母与锁体螺纹连接，连接段与流出段螺纹连接，便于安装、更换剪销；
4、锁紧孔A、锁紧孔B和固定螺钉配合，限制周向转动；
5、剪销头包括大头和小头，剪销孔包括外段和内段，可限制剪销径向向内移动。
附图说明
图1为本发明启动前示意图；
图2为本发明启动后示意图；
图中：1-中心杆、2-锁定杆、21-连接段、211-凸起部、212-凹槽、22-流出段、221-流出孔、23-封闭段、24-流入段、241-流入孔、3-锁体、31-锁定段、32-密封段、33-液道段、4-锁紧螺母、5-剪销、51-剪销头、52-剪销尾、6-固定螺钉、71-流出段内腔、72-液道段内腔、73-流入段内腔。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图，对本发明进行进一步详细说明。
如图1所示，本发明公开的取芯钻机液道启动机构，包括锁体3，锁体3前后贯通，锁体3从后至前依次为锁定段31、密封段32和液道段33，锁定段31侧壁有剪销孔，剪销孔为通孔，还包括锁定杆2，所述锁定杆2前后贯通，锁定杆2在锁体3内，锁定杆2从后至前依次为连接段21、流出段22、封闭段23和流入段24，连接段21与流出段22螺纹连接，封闭段23和流入段23焊接，连接段21外壁有凹槽212，凹槽212为环形槽，还包括剪销5，剪销5长度大于剪销孔深度，剪销5在剪销孔和凹槽212内，流出段22侧壁开有流出孔221，流出孔221由内向外向前倾斜，流出孔221有多个，多个流出孔221沿径向圆周均匀分布，流入段24侧壁开有流入孔241，流入孔241有多个，流入孔241在流入段24不同侧面前后分布，还包括中心杆1，中心杆1在锁定杆2内，密封段32内径等于封闭段23外径等于流出段22外径，液道段33内径大于锁定杆2外径，连接段21、流出段22和流入段24的内径大于中心杆1外径，封闭段23内径等于中心杆1外径，密封段32前端到锁体3后端的轴向距离小于封闭段23前端到锁体3后端的轴向距离，液道段 33内壁和流入段24外壁围成液道段内腔72，流入段24内壁与中心杆1外壁围成流入段内腔73，中心杆1外壁与流出段22内壁、连接段21内壁围成流出段内腔71，液道段内腔72与流入段内腔73通过流入孔241连通，锁定段31内径大于密封段32内径，连接段21外壁有凸起部211，凸起部211外径大于密封段32内径，连接段21凸起部211前方外径等于密封段32内径，凹槽212在凸起部211，还包括锁紧螺母4，锁紧螺母4在锁体3后方，锁紧螺母4前后贯通，中心杆1穿过锁紧螺母4内腔，锁紧螺母4前端与锁体3后端螺纹连接，剪销孔开在锁体3后端螺纹处，锁紧螺母4内壁到凹槽212底的径向距离不小于剪销5长度，锁紧螺母4包括固定段和螺纹段，连接段21凸起部211后方外径小于固定段内径小于凸起部211外径，螺纹段内径等于锁定段31外径，锁紧螺母4轴向开有锁紧孔A，锁紧孔A为剪销孔，锁体3后端面有锁紧孔B，锁紧孔B为盲孔，锁紧孔A和锁紧孔B配对，还包括固定螺钉6，固定螺钉6长度大于锁紧孔A深度，固定螺钉6在锁紧孔A内，固定螺钉6前端穿过锁紧孔A嵌入锁紧孔B内。
启动前，剪销5穿过剪销孔嵌入凹槽212，流出孔221外壁开口到锁体3后端的轴向距离小于液道段33后端到锁体3后端的轴向距离，流出孔221外壁开口被密封段32封闭，液体不能向前流动，后方泥浆泵提供的液压达到启动值后，冲击锁定杆2后端，减断剪销5，剪销5断为剪销头51和剪销尾52，剪销头51在剪销孔内，剪销尾52在凹槽212内，锁定杆2前移，流出孔221外壁开口到锁体3后端的轴向距离大于液道段33后端到锁体3后端的轴向距离，流出段内腔71与液道段内腔72通过流出孔221连通，液体通道连通，液体进入液体流道流向前方驱动前方的液压马达和冷却钻机钻头。
剪销头51包括大头和小头，大头朝外，大头外径大于小头外径，剪销 孔包括外段和内段，外段孔径不小于大头外径，内段孔径不小于小头外径，内段孔径小于大头外径，外段深度不小于大头长度，小头与剪销尾52长度的和大于内段深度。
连接段21凸起部211外径为56mm，内径为36mm，总长为106mm，连接段21凸起部211前方、后方外径均为50mm，凹槽212深6mm，凸起部211后端距离连接段21后端15mm，凹槽212前端距离连接段后端27.8mm，凹槽212宽5.5mm，凹槽212前端距离连接段21前端73mm，连接段21侧壁还开有一孔径为8mm的通孔，通孔孔心距离连接段21前端65mm，连接段21前端螺纹处外径为43mm，螺纹为M45×1.5mm，连接段21与流出段22螺纹连接的长度为39mm。
流出段22和封闭段23外径均为50mm，流出段22内径为36mm，流出孔221孔径为8mm，流出孔221与轴向夹角为45°，流出孔221外壁开口前端距离流出段22后端152mm，流出孔221有6个，流出段22和封闭段23总长196mm，封闭段23内径为25mm，流入孔241孔径为16mm，流入孔241有4个，分别在4个侧面，4个流入孔241孔心距离流入段24后端距离分别为39mm、55mm、71mm和87mm，流入段24内径为40.5mm、流入段24外径为44.5mm，中心杆1外径为25mm。
锁定段31外径为82mm，内径为56mm，剪销孔孔心距离锁定段31后端8mm，锁定段31长56mm，剪销孔外段孔径为8mm，深5mm，内段孔径为5mm，深度为8mm，密封段32外径为99.6mm，内径为50mm，密封段32长176mm，液道段33内径为70mm。
剪销5总长16.5mm，剪销头51大头长3.5mm，外径为7mm，剪销头51小头外径为4.8mm，剪销头51小头与剪销尾52长度的和为13mm。
当然，本发明还可有其它多种实施例，在不背离本发明精神及其实质的情况下，熟悉本领域的技术人员可根据本发明作出各种相应的改变和变形，但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。

Claims (10)

  1. 一种取芯钻机液道启动机构，其特征在于：包括锁体(3)、锁定杆(2)、剪销(5)、中心杆(1)，所述锁体(3)前后贯通，锁体(3)从后至前依次为锁定段(31)、密封段(32)和液道段(33)，锁定段(31)侧壁有剪销孔，剪销孔为通孔，所述锁定杆(2)前后贯通，锁定杆(2)在锁体(3)内，锁定杆(2)从后至前依次为连接段(21)、流出段(22)、封闭段(23)和流入段(24)，连接段(21)外壁有凹槽(212)，所述剪销(5)长度大于锁体(3)侧壁上的剪销孔深度，所述剪销(5)在剪销孔和凹槽(212)内，流出段(22)侧壁开有流出孔(221)，流入段(24)侧壁开有流入孔(241)，所述中心杆(1)在锁定杆(2)内，所述密封段(32)内径等于封闭段(23)外径，所述液道段(33)内径大于锁定杆(2)外径，所述连接段(21)、流出段(22)和流入段(24)的内径大于中心杆(1)外径，所述封闭段(23)内径等于中心杆(1)外径，所述密封段(32)前端到锁体(3)后端的轴向距离小于封闭段(23)前端到锁体(3)后端的轴向距离，液道段(33)内腔(72)与流入段(24)内腔(73)通过流入孔(241)连通，剪销(5)穿过剪销孔嵌入凹槽(212)，流出孔(221)外壁开口到锁体(3)后端的轴向距离小于液道段(33)后端到锁体(3)后端的轴向距离。
  2. 根据权利要求1所述的取芯钻机液道启动机构，其特征在于：所述锁定段(31)内径大于密封段(32)内径，所述连接段(21)外壁有凸起部(211)，凸起部(211)外径大于密封段(32)内径，连接段(21)凸起部(211)前方外径等于密封段(32)内径，所述凹槽(212)在凸起部(211)。
  3. 根据权利要求1所述的取芯钻机液道启动机构，其特征在于：所述流出孔(221)由内向外向前倾斜。
  4. 根据权利要求1所述的取芯钻机液道启动机构，其特征在于：所述流出孔(221)有多个，多个流出孔(221)沿径向圆周均匀分布。
  5. 根据权利要求1所述的取芯钻机液道启动机构，其特征在于：所述流入孔(241)有多个，流入孔在不同侧面前后分布。
  6. 根据权利要求1所述的取芯钻机液道启动机构，其特征在于：所述连接段(21)与流出段(22)螺纹连接，所述封闭段(23)和流入段(24)焊接。
  7. 根据权利要求2所述的取芯钻机液道启动机构，其特征在于：还包括锁紧螺母(4)，锁紧螺母(4)在锁体(3)后方，锁紧螺母(4)前后贯通，中心杆(1)穿过锁紧螺母(4)内腔，锁紧螺母(4)前端与锁体(3)后端螺纹连接，剪销孔开在锁体(3)后端螺纹处，锁紧螺母(4)内壁到凹槽(212)底的径向距离不小于剪销(5)长度。
  8. 根据权利要求7所述的取芯钻机液道启动机构，其特征在于：所述锁紧螺母(4)包括固定段和螺纹段，连接段(21)凸起部(211)后方外径小于固定段内径小于凸起部(211)外径，螺纹段内径等于锁定段(31)外径。
  9. 根据权利要求1所述的取芯钻机液道启动机构，其特征在于：启动后，锁定杆(2)前移，剪销(5)剪断，剪销头(51)在剪销孔内，剪销尾(52)在凹槽(212)内，所述剪销头(51)包括大头和小头，大头朝外，大头外径大于小头外径，所述剪销孔包括外段和内段，外段孔径不小于剪销头(51)大头外径，内段孔径不小于剪销头(51)小头外径，内段孔径小于大头外径，外段深度不小于大头长度，小头与剪销尾(52)长度的和大于内段深度。
  10. 根据权利要求7所述的取芯钻机液道启动机构，其特征在于：所述锁紧螺母(4)轴向开有锁紧孔A，所述锁紧孔A为剪销孔，锁体(3)后端 面有锁紧孔B，锁紧孔B为盲孔，锁紧孔A和锁紧孔B配对，还包括固定螺钉(6)，固定螺钉长度(6)大于锁紧孔A深度，固定螺钉(6)在锁紧孔A内，固定螺钉(6)前端穿过锁紧孔A嵌入锁紧孔B内。
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