WO2013020298A1 - 一种螺纹连接装置 - Google Patents

一种螺纹连接装置 Download PDF

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Publication number
WO2013020298A1
WO2013020298A1 PCT/CN2011/078292 CN2011078292W WO2013020298A1 WO 2013020298 A1 WO2013020298 A1 WO 2013020298A1 CN 2011078292 W CN2011078292 W CN 2011078292W WO 2013020298 A1 WO2013020298 A1 WO 2013020298A1
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WO
WIPO (PCT)
Prior art keywords
elastic piece
threaded connection
connection device
retracting
nut
Prior art date
Application number
PCT/CN2011/078292
Other languages
English (en)
French (fr)
Inventor
励国庆
Original Assignee
Li Guoqing
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Li Guoqing filed Critical Li Guoqing
Priority to PCT/CN2011/078292 priority Critical patent/WO2013020298A1/zh
Priority to CN201180008010.4A priority patent/CN103052815B/zh
Publication of WO2013020298A1 publication Critical patent/WO2013020298A1/zh

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Classifications

    • 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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
    • F16L19/005—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts comprising locking means for the threaded 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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B39/00—Locking of screws, bolts or nuts
    • F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
    • F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
    • F16B39/32—Locking by means of a pawl or pawl-like tongue

Definitions

  • the invention belongs to the field of mechanical structures, and in particular relates to a threaded connection device, which comprises a bolt and a nut, respectively having internal and external threads, which are in meshing connection.
  • threaded connections are one of the most common ways of joining. They usually consist of bolted and nut parts that are joined or separated by internal and external threads.
  • a prominent problem for this type of product is how to prevent it from loosening.
  • the most common method in the prior art is to place an elastic washer between the bolt and the nut.
  • the gasket is deformed after being pressed to generate an axial force to prevent circumferential movement of the nut. In this case, the elastic force of the gasket and the movement tendency of the nut are vertical, and the anti-loose effect is not good; and the elastic gasket is easy to age, loses elasticity, and has no anti-loose effect.
  • Chinese patent CN2536834 discloses a self-locking self-locking thread which improves the inclination between the thread bottom and the crest, and fixes the thread shape of the bolt and the nut at 60 degrees to eliminate the thread bottom and the crest. The gap between them makes the entire thread clamping load evenly distributed to improve the anti-loosening performance.
  • the disadvantage of this type of solution is that the processing accuracy is high and the processing difficulty is increased. Once the bolt and nut profiles produced are not at a prescribed angle, the anti-loosening effect is not obtained. At the same time, it is too demanding on the installation environment. If there is debris entering the thread during installation, the design is meaningless. Summary of the invention
  • a threaded connection device comprising a bolt and a nut, respectively having internal and external threads, intermeshing and connecting, the rear portion of the external thread being provided with at least one circumferential card slot, a card
  • the slot has a retracting elastic piece, the lower part of which is disposed in the card slot, and the upper part protrudes out of the card slot;
  • the front end of the internal thread has a retaining ring, and the anti-retracting ring is repeatedly arranged by the inner circumference of the wave-shaped anti-back tooth Composition;
  • the anti-backing elastic piece is a metal foil with a broken line.
  • the lower portion of the retracting elastic piece has a protruding positioning point and a raised tongue, and is fixed in the card slot.
  • One side of the upper end of the retracting elastic piece has an inwardly bent bent portion.
  • each of the wavy anti-back teeth is composed of a long side and a short side, so as to have two end points and one vertex, the two end points are the same distance from the center of the circle, and are larger than the distance from the center of the vertex;
  • the line connecting the end point and the center of the circle is located on both sides of the line connecting the apex and the center, and forms two corners, wherein the smaller one has an angle of less than 10°.
  • the front end of the retaining ring has a chamfer that is inwardly retracted in the circumferential direction.
  • the anti-return elastic piece is inserted into the card slot after the external thread, and the upper part protrudes out of the card slot; when the anti-retraction ring of the front end of the internal thread rotates, cooperate with the anti-return elastic piece to stop the retracting elastic piece Bending, so that the anti-retracting ring can rotate clockwise; and when the anti-retracting ring is to rotate counterclockwise, the anti-returning elastic piece bounces against the short side of the anti-backing tooth so that it cannot rotate counterclockwise, which can be effective Prevent the thread from being reversed. The positioning point and the tongue of the lower part of the elastic piece are stopped, so that it can be better fixed in the card slot.
  • the bent portion at the upper end of the retracting elastic piece cooperates with the chamfering of the front end of the retaining ring to provide a plunging angle for the internally threaded member, so that it can smoothly contact the retracting elastic piece and bend it, thereby further clockwise Rotate forward.
  • the present invention fundamentally prevents the screw member from being reversed and has an excellent anti-loosening effect.
  • the thrust shrapnel will not lose its effect due to aging of the material, and it can be used for a long time.
  • the invention needs to be unloaded after tightening, it needs to be inserted into the gap between the bolt and the nut by a tool such as a screwdriver, and the anti-back spring is bent, so that the invention can be turned counterclockwise; if the connection is screwed Tight, no tool insertion space, the invention will not be able to unload.
  • Figure 1 is a schematic view showing the structure of the embodiment.
  • Figure 2 is a cross-sectional view taken along line C-C of the present embodiment.
  • Figure 3 is a schematic view of the nut structure.
  • Figure 4 is a cross-sectional view of the nut D-D.
  • Figure 5 is a partial structural view of the cross section of the nut D-D.
  • Figure 6 is a schematic view of the structure of the retracting piece.
  • Figure 7 is a cross-sectional view of the retracted piece AA.
  • Figure 8 is a cross-sectional view of the bouncer B-B.
  • the present embodiment includes a bolt member 1 and a nut 2, the bolt member 1 having an external thread 12 at one end thereof, the nut 2 having an internal thread 23.
  • the bolt member 1 has two centrally symmetrical card slots in the circumferential direction at the rear end of the external thread 12, and a plurality of retracting elastic pieces 3 are disposed in each of the two card slots 11.
  • the front end of the nut 2 also has a retaining ring 21 composed of undulating retaining teeth 22 having a repeating arrangement on the inner circumference; each of the undulating retaining teeth 22 has a long side EG and a short side
  • the FG is configured to have a first end point E, a second end point F, and a vertex G; wherein, the first end point E and the second end point F are the same distance from the center 0 of the stop ring 21, and are larger than the vertex G from the center of the stop ring 21
  • the front end of the stop ring 21 has a circumferential inward indentation
  • the chamfer 24 of 60 degrees, the chamfer 24 is formed because the outer edge of the front end of the retaining ring 21 is higher than the inner side.
  • the anti-return elastic piece 3 has a sheet-like body with a cross-sectional line, and a lower and lower part forms a folding angle of about 160 degrees.
  • the lower part 31 is placed in the card slot 11, and the upper part 32 extends out of the card slot 11; a raised positioning point 35 and a raised tongue 34, the thickness of the retaining elastic piece 3 at the positioning point 35 is equal to the thickness of the card slot 11, and the thickness of the retaining elastic piece 3 at the raised position of the tongue piece 34 is greater than the thickness of the card slot 11;
  • One side of the upper end 37 of the retracting elastic piece 3 has a bent portion 33 bent inwardly, and the bent portion 33 forms a folding angle of about 120 degrees.
  • the lower portion 31 of the retracting elastic piece 3 is inserted into the card slot 11 in use. Since the thickness of the retractable elastic piece 3 at the position where the tongue piece 34 is lifted is larger than the thickness of the card slot 11, the lower portion 31 of the retracting elastic piece 3 is During the insertion of the card slot 11, the raised portion of the tab 34 is gradually compressed inward by the pressing action of the card slot 11 until the tongue piece 34 completely enters the card slot 11; at this time, the tongue piece 34 can be itself With the elastic force, the lifting portion is firmly pressed against the inner wall of the slot 11, so that the lower portion 31 of the anti-back spring 3 can be resisted by the lifting of the tongue 34 and the inner wall of the slot 11. , is fixed in the card slot 11, and is not easily pulled out.
  • the front end of the nut 2 When the nut 2 is rotated in the clockwise direction to engage the bolt member 1, the front end of the nut 2 has a chamfer 24 which is retracted inwardly in the circumferential direction by 60 degrees, and the side of the upper end 37 of the retractable elastic piece 3 is provided.
  • the bent portion 33 is bent inwardly and has a folding angle of about 120 degrees. Therefore, after the front end of the nut 2 is in contact with the side of the upper end 37 of the retaining elastic piece 3, the bent portion 33 of the upper end 37 of the retaining elastic piece 3 can be tightly closed.
  • the chamfer 24 is attached, and during the rotation of the nut 2 in the clockwise direction, it is compressed inward by the pressing of the chamfer 24, and gradually slides into the retaining ring 21 of the nut 2, at which time the top of the retractable elastic piece 3 is stopped.
  • the edge 36 abuts against the first end point E of one of the retaining teeth 22 on the stop ring 21.
  • the long side EG can generate a certain pressure on the retracting elastic piece 3, so that the retractable elastic piece 3 along the long side EG
  • the slope is gradually compressed inward; at the same time, because the ZGEF in the AEFG is 10 degrees, it can be seen that the long side EG has a small slope, and the smaller the slope of the edge, the smaller the resistance is, so the retractable sheet 3 is stopped.
  • the top edge 36 can slide through the long side EG, under the action of a small external force, to the vertex G and over the vertex G, and gradually slide outward along the slope of the short side FG to the second end point F.
  • the anti-return elastic piece 3 When the nut 2 is rotated into position, the anti-return elastic piece 3 has its own elastic force, and its upper portion 32 abuts against the retaining ring 21, and its top edge 36 is located just above the second end of one of the retaining teeth 22 on the retaining ring 21. F, and firmly on the short side FG; At this time, because the AEFG has a ZEFG of 85 degrees, it can be seen that the short side FG has a large slope, and the greater the slope caused by the edge, the more resistance Therefore, the top edge 36 of the retractable piece 3 can be loosened by the interaction between the elastic force and the resistance generated by the short side FG after the bolt member 1 and the nut 2 are engaged, so that the two are less susceptible to external force.
  • the retractable elastic piece 3 when the bolt member 1 and the nut 2 need to be disassembled for inspection or maintenance, the retractable elastic piece 3 is only pressed inwardly by the tool, so that the upper portion 32 of the retractable elastic piece 3 is compressed inward by an external force, and the top thereof is compressed.
  • the side 36 is away from the short side FG, and now the nut 2 can be rotated counterclockwise to unscrew the nut 2 from the bolt part 1.
  • the retractable elastic piece in the case where the upper portion 32 of the retracting elastic piece 3 is pressed, since the thickness of the retracting elastic piece 3 at the positioning point 35 is equal to the thickness of the card slot 11, the retractable elastic piece can be made under the support of the positioning point 35.
  • the lower portion 31 of 3 remains stable and is unaffected by the compression of its upper portion 32.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Clamps And Clips (AREA)
  • Bolts, Nuts, And Washers (AREA)

Abstract

一种螺紋连接装置，包括螺栓(1)和螺母(2)，分别带有内外螺紋(23，12)，互相啮合连接，外螺紋(12)的后部设有至少一个周向的卡槽(11)，卡槽(11)内有一止退弹片(3)，其下部(31)置于卡槽(11)内，上部(32)伸出卡槽(11)外；内螺紋(23)的前端带有止退圈(21)，止退圈(21)由圆周上重复排列的破浪状止退齿(22)组成；内外螺紋(23，12)啮合时，止退弹片(3)的前端抵在止退齿(22)上。从根本上防止了螺紋部件倒转，具有极佳的防松效果。

Description

说 明 书 一种螺紋连接装置
技术领域
本发明属于机械结构领域， 尤其涉及一种螺紋连接装置， 它包括螺栓和螺母， 分别带有 内外螺紋， 互相啮合连接。
背景技术
在机械领域， 螺紋连接是最常见的连接方式之一， 它通常包括螺栓部件和螺母部件， 通 过内外螺紋来连接或分开。对该类产品来说， 一个突出的问题是如何防止其松开。在螺栓螺 母工作过程中， 有可能受到持续的震动， 也有可能热胀冷缩时因不同的膨胀率而产生间隙， 或其他各种情况导致连接产生松动。现有技术中最常用的办法是在螺栓和螺母之间放置弹性 垫圈， 垫圈受压后变形， 产生一个轴向的力， 从而防止螺母发生周向的运动。这种情况下垫 圈的弹力与螺母运动趋势是垂直的， 防松效果不佳； 且弹性垫圈容易老化， 失去弹性， 也就 没有防松的作用了。
中国专利 CN2536834公开了一种防松自锁螺紋，其对螺紋牙底和牙顶之间的倾角做了改 进， 将螺栓和螺母的螺紋牙型固定在 60度， 以消除螺紋牙底和牙顶之间的间隙， 使得整个 螺紋夹紧负载分配均匀， 来提高防松性能。这种方案的缺点是对加工精度的要求高， 加工难 度加大， 一旦生产出的螺栓和螺母牙型达不到规定的角度， 就起不到防松效果。 同时， 它对 安装环境的要求也过高， 如果安装过程中有杂物进入螺紋中， 该设计也就没有意义了。 发明内容
本发明的目的是提供一种螺紋连接装置， 可以长期有效地达到防松目的。
为此， 本发明采用的技术方案是这样的： 一种螺紋连接装置， 包括螺栓和螺母， 分别带 有内外螺紋，互相啮合连接，外螺紋的后部设有至少一个周向的卡槽，卡槽内有一止退弹片， 其下部置于卡槽内， 上部伸出卡槽外； 内螺紋的前端带有止退圈， 所述的止退圈由内圆周上 重复排列的波浪状止退齿组成； 内外螺紋啮合时， 止退弹片的前端抵在所述的止退齿上。
作为进一步的技术方案， 所述的止退弹片为一截面为折线的金属薄片。
止退弹片的下部具有突起的定位点和翘起的舌片， 固定在卡槽内。
止退弹片上端的一侧带有一向内弯折的弯折部。
更进一步地，所述的每一个波浪状止退齿由一长边和一短边构成，从而具有两个端点和 一个顶点， 两个端点距圆心的距离相同， 大于顶点距圆心的距离； 两个端点与圆心的连线分 别位于顶点与圆心的连线两侧， 并形成两个角， 其中较小的一个角的角度小于 10°。
所述止退圈的前端具有圆周方向上向内缩进的倒角。
本发明在使用时， 将止退弹片插入外螺紋后的卡槽内， 其上部伸出卡槽外； 当内螺紋前 端的止退圈旋转时， 与该止退弹片相配合， 将止退弹片压弯， 使得止退圈能作顺时针旋转； 而当止退圈欲作逆时针旋转时， 止退弹片弹起， 抵住止退齿的短边， 令其不能逆时针旋转， 从而可以有效地防止螺紋倒转。止退弹片下部的定位点、舌片，使其能更好地固定在卡槽内。 止退弹片上端的弯折部与止退圈前端的倒角相配合，为内螺紋部件提供了一个切入角，使其 能顺利地与止退弹片相接触并将其压弯， 从而进一步顺时针旋转前进。
从以上分析可以看出， 本发明从根本上防止了螺紋部件倒转， 具有极佳的防松效果。 同 时， 止推弹片不会因材料老化而失去作用， 可以长期地起到防松作用。
需要注意的是，本发明拧紧后如需卸开，则需用螺丝刀等工具塞入螺栓与螺母的空隙内， 将止退弹片压弯， 才能逆时针旋转打开本发明； 如连接时拧得过紧， 无工具插入空间了， 则 本发明将无法再行卸开。
附图说明
以下结合附图和实施例对本发明做进一步详细的描述。
图 1为本实施例结构示意图。
图 2为本实施例 C-C截面图。
图 3为螺母结构示意图。
图 4为螺母 D-D截面图。
图 5为螺母 D-D截面局部结构示意图。
图 6为止退弹片结构示意图。 图 7为止退弹片 A-A截面图。
图 8为止退弹片 B-B截面图。
图中：
1、 螺栓部件 2、 螺母 3、 止退弹片 11、 卡槽 12、 外螺紋 21、 止退圈 22、 止退齿 23、 内螺紋 31、 止退弹片下部 32、 止退弹片上部 33、 止退弹片弯折部 34、 止退弹片舌片 35、 止退弹片定位点 36、 止退弹片顶边 37、 止退弹片上端 具体实施方式
参见附图。 本实施例包括一螺栓部件 1和一螺母 2， 所述的螺栓部件 1在其一端带有外 螺紋 12，所述的螺母 2带有内螺紋 23。螺栓部件 1在外螺紋 12后端处的圆周方向上开有两 个呈中心对称的卡槽 11， 两个卡槽 11内各设置有一止退弹片 3。 螺母 2的前端还带有止退 圈 21， 止退圈 21由内圆周上带有重复排列的波浪状止退齿 22组成； 每一个波浪状止退齿 22由一长边 EG和一短边 FG构成， 具有第一端点 E、 第二端点 F和顶点 G; 其中， 第一端点 E和第二端点 F距止退圈 21圆心 0的距离相同， 大于顶点 G距止退圈 21圆心 0的距离， 从 而令第一端点 E、 第二端点 F和顶点 G构成 AEFG， 该 AEFG中 ZGEF为 10度、 ZEFG为 85 度； 止退圈 21的前端具有圆周方向上向内缩进为 60度的倒角 24， 倒角 24因止退圈 21前 端的外边高于内边而形成。
所述止退弹片 3具有一截面为折线的片状本体，其上下部形成一个约 160度的折角，下 部 31置于卡槽 11内， 上部 32伸出卡槽 11 ; 下部 31带有两个凸起的定位点 35和翘起的舌 片 34， 止退弹片 3在定位点 35处的厚度等于卡槽 11厚度， 止退弹片 3在舌片 34翘起处的 厚度大于卡槽 11厚度； 止退弹片 3上端 37的一侧带有向内弯折的弯折部 33， 该弯折部 33 形成的折角约为 120度。
本实施例在使用时， 将止退弹片 3的下部 31插入卡槽 11中， 因止退弹片 3在舌片 34 翘起处的厚度大于卡槽 11厚度， 故在止退弹片 3的下部 31插入卡槽 11的过程中， 舌片 34 翘起处会受卡槽 11的挤压作用而逐渐向内压缩， 直至舌片 34完全进入卡槽 11内； 此时， 舌片 34便可在本身具有的弹力作用下，令其翘起处牢牢地抵在卡槽 11的内壁上，从而令止 退弹片 3的下部 31能受舌片 34翘起处与卡槽 11内壁之间的抵触作用， 被固定于卡槽 11 内， 不易被拔出。
当螺母 2按顺时针方向旋转，与螺栓部件 1进行啮合时， 因螺母 2的前端具有圆周方向 上向内缩进为 60度的倒角 24， 以及止退弹片 3上端 37的一侧带有向内弯折， 其折角约为 120度的弯折部 33， 故可在螺母 2的前端与止退弹片 3上端 37的一侧接触后， 止退弹片 3 上端 37的弯折部 33能紧贴倒角 24， 并在螺母 2按顺时针方向旋转的过程中， 受倒角 24的 挤压而向内压缩，逐步滑入螺母 2的止退圈 21内，此时止退弹片 3的顶边 36正好抵在止退 圈 21上其中一止退齿 22的第一端点 E上。在止退弹片 3的顶边 36自第一端点 E沿长边 EG 的斜度滑动过程中，长边 EG能对止退弹片 3产生一定的压力，令止退弹片 3沿长边 EG的斜 度被逐渐向内压缩； 同时， 因 AEFG中 ZGEF为 10度， 可知长边 EG具有较小的斜度， 由于 边的斜度越小其产生的阻力也越小， 故止退弹片 3的顶边 36能在较小的外力作用下通过长 边 EG， 滑动至顶点 G并越过顶点 G， 沿短边 FG的斜度逐渐向外滑动至第二端点 F。 当螺母 2 旋转到位后， 止退弹片 3因本身具有的弹力作用， 其上部 32紧贴止退圈 21， 其顶边 36则 正好位于止退圈 21上其中一止退齿 22的第二端点 F上， 并牢牢地抵在短边 FG上； 此时， 因 AEFG中 ZEFG为 85度， 可知短边 FG具有较大的斜度， 由于边的斜度越大所产生的阻力 也就越大， 故止退弹片 3的顶边 36可在本身具有的弹力和短边 FG产生的阻力相互作用下， 在螺栓部件 1与螺母 2啮合后， 令两者不易受外力影响而松动。
本实施例因检查或维修， 需要对螺栓部件 1与螺母 2进行拆卸时，只需通过工具向内挤 压止退弹片 3， 使止退弹片 3的上部 32受外力作用向内压缩， 其顶边 36远离短边 FG， 此刻 便可按逆时针方向旋转螺母 2， 将螺母 2从螺栓部件 1上拧下。
本实施例在止退弹片 3的上部 32受压的情况下， 由于止退弹片 3在定位点 35处的厚 度等于卡槽 11厚度， 故可在定位点 35的支撑作用下， 令止退弹片 3的下部 31保持稳定， 不受其上部 32受压的影响。

Claims

权利要求书
1， 一种螺紋连接装置， 包括螺栓和螺母， 分别带有内外螺紋， 互相啮合连接， 其特征在于： 外螺紋的后部设有至少一个周向的卡槽， 卡槽内有一止退弹片， 其下部置于卡槽内， 上部伸 出卡槽外； 内螺紋的前端带有止退圈，所述的止退圈由内圆周上重复排列的波浪状止退齿组 成； 内外螺紋啮合时， 止退弹片的前端抵在所述的止退齿上。
2， 如权利要求 1所述的螺紋连接装置， 其特征在于： 所述的止退弹片为一截面为折线的金 属薄片。
3， 如权利要求 2所述的螺紋连接装置， 其特征在于： 止退弹片的下部具有突起的定位点和 翘起的舌片， 固定在卡槽内。
4， 如权利要求 3所述的螺紋连接装置， 其特征在于： 止退弹片上端的一侧带有一向内弯折 的弯折部。
5， 如权利要求 1-4任一项所述的螺紋连接装置， 其特征在于： 所述的每一个波浪状止退齿 由一长边和一短边构成， 从而具有两个端点和一个顶点， 两个端点距圆心的距离相同， 大于 顶点距圆心的距离；两个端点与圆心的连线分别位于顶点与圆心的连线两侧，并形成两个角， 其中较小的一个角的角度小于 10°。
6， 如权利要求 5所述的螺紋连接装置， 其特征在于： 所述止退圈的前端具有圆周方向上向 内缩进的倒角。
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ITMI20130172A1 (it) * 2013-02-07 2014-08-08 Caleffi Spa Sistema di accoppiamento ad avvitamento antimanomissione per valvola di un impianto termico/sanitario per edifici
CN104141671A (zh) * 2013-05-07 2014-11-12 Ae科技株式会社 螺母及螺栓同螺母的紧固连结结构
JP7385917B2 (ja) 2019-12-26 2023-11-24 株式会社タカギ ラチェット機構を備えた継手

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CN108374935B (zh) * 2018-03-09 2024-04-12 郑州众汇和制冷配件有限公司 一种不可拆卸且防松动的管接头组件
CN110952968B (zh) * 2019-12-30 2022-01-28 西南石油大学 一种高疲劳寿命型超高压压裂由壬接头

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CN104141671A (zh) * 2013-05-07 2014-11-12 Ae科技株式会社 螺母及螺栓同螺母的紧固连结结构
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