WO2016082665A1 - 填料式塔板 - Google Patents

填料式塔板 Download PDF

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Publication number
WO2016082665A1
WO2016082665A1 PCT/CN2015/093714 CN2015093714W WO2016082665A1 WO 2016082665 A1 WO2016082665 A1 WO 2016082665A1 CN 2015093714 W CN2015093714 W CN 2015093714W WO 2016082665 A1 WO2016082665 A1 WO 2016082665A1
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WIPO (PCT)
Prior art keywords
tray
filler
baffles
tray body
liquid
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PCT/CN2015/093714
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English (en)
French (fr)
Inventor
葛红军
徐丽梅
杨伟东
邱玉梅
沙嘉敏
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南通苏通分离工程科技有限公司
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Publication of WO2016082665A1 publication Critical patent/WO2016082665A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/14—Fractional distillation or use of a fractionation or rectification column
    • B01D3/16—Fractionating columns in which vapour bubbles through liquid
    • B01D3/18—Fractionating columns in which vapour bubbles through liquid with horizontal bubble plates

Definitions

  • the invention relates to a packed tray, which is a tray installed in a chemical tower equipment and belongs to the field of chemical equipment.
  • Tower equipment is a gas-liquid, liquid-liquid contact mass transfer equipment commonly used in petroleum and chemical industry, mainly including plate pedals and packed trays.
  • the high-efficiency packed pedal has a high effect and a large production capacity, but it is not suitable for high pressure and easy coking because of its high cost.
  • ordinary slab towers are widely used in China under normal pressure and high pressure conditions due to their low cost.
  • the liquid-gas ratio is very large, for example, the liquid-gas molar ratio of the water-eluting carbon is as high as 100 or more.
  • ordinary plate towers often have an advantage: the liquid receiving area on the tray often occupies a large tower cross-sectional area, resulting in a low processing capacity of the tower. If a packed tower is used, the tower diameter will be designed to be large in order to pass the large liquid volume, and the gas passes through the packing layer at a very low gas velocity, the mass transfer is small, the efficiency is low, the water consumption is large, and the energy consumption is high.
  • the fixed valve tray has the advantages of large production capacity, high efficiency of the tray, low processing and maintenance cost, and has wide application in the petrochemical industry.
  • the fixed valve trays in the industry are mainly round fixed float valves and strip fixed float valves.
  • the two fixed float valves mainly have the following characteristics: directly punching round and strip on the plane of the tray
  • the protrusion has its edge opening as a gas phase passage, and a valve leg is connected to the tray before and after the valve piece to support the valve piece, and the angle between the valve leg and the plane of the tray is about 90 degrees.
  • the gas outlet is a circular arc, and the gas ejected from the front half of the outlet has a certain pushing effect on the liquid flow on the plate, and the liquid ejected from the rear half of the outlet has a blocking effect on the liquid flow on the plate, before and after
  • the two roles weaken each other.
  • the gas ejection direction is perpendicular to the liquid flow direction, and not only does not have a liquid pushing effect, but also the gas directions ejected by the adjacent two valve sheets are opposite, causing a serious collision phenomenon, which easily causes back mixing. Entrainment of mist, weakening the mass transfer function of the tray and reducing the efficiency of the tray.
  • the tongue-shaped tray has inclined tongue holes, so that the direction of the jet airflow is close to the horizontal, so the mist entrainment is greatly reduced, and the airflow has a propelling effect on the liquid flow, so the gas-liquid flow passing ability is high, and the gas passage is high.
  • the amount is large, the liquid level drop is small, and there is no back mixing phenomenon, which can reduce the pressure drop of the tray.
  • the tongue-shaped tray has the advantages of high efficiency of the tray, thinner liquid layer on the plate, and small pressure drop of the tray.
  • the tongue-shaped tray has poor adaptability to load fluctuations, and the operation flexibility is small.
  • the serious gas phase entrainment may cause the plate efficiency to decrease.
  • the liquid layer on the tray is too thin, the liquid residence time is short, and the gas-liquid contact is insufficient. The efficiency is significantly reduced.
  • the tray and filler composite mainly consists of overflow tray composite filler and through-flow tray composite filler. Because of the simple structure of the flow-through tray and easy packing and compounding, it is the most ideal composite form of tray filler. However, the existing through-flow tray composite filler limits the flexibility and load capacity of the composite tray due to the flooding of the structured packing.
  • the tray can be divided into an overflow tray and a through-flow tray according to the presence or absence of a downcomer.
  • the existing through-flow type The tray structure is simple, the space utilization in the tower is high, the cost is low, and the processing capacity is large, but the vapor-liquid contact time is short, the mass transfer efficiency is low, and the operation flexibility is small.
  • the ideal inner part of the tower should have the characteristics of low pressure drop, high efficiency, large operational flexibility, anti-blocking, low cost, large processing capacity and high space utilization in the tower. Combining trays and packing is one of the effective ways to achieve the ideal internals.
  • Fiber bundle filler is a newly developed high surface area net-type flexible filler with gas phase and continuous phase. The liquid gas velocity is up to 8m/s, the mass transfer efficiency is high, and the pressure drop is only 1/1 of the normal structured packing. 2-1/3.
  • the patent name is a vertical blown film tray, which includes a horizontal tray and a plurality of caps; the horizontal tray is provided with a plurality of plate holes, and the holes are arranged between the holes;
  • the number of the plates is equal to the number of the caps;
  • the cap includes a vertical tube, a top cover and a bottom bracket open at both ends, and the top cover and the bottom bracket are respectively disposed at the upper open end and the lower open end of the vertical cylinder
  • a gap is provided between the top cover and the bottom support and the vertical cylinder; the vertical cylinder is fixed in the hole of the plate, and a gap is provided between the vertical cylinder and the horizontal tray;
  • Both the shape of the cross section and the shape of the base are the same as the shape of the plate aperture, and the projection of the top cover on the horizontal surface may obscure the vertical cylinder.
  • the invention can make the gas pass through the tray in the form of a horizontal blown liquid film, and the pressure drop of the tray is small compared with the conventional tray without the need to overcome the static pressure of the liquid layer.
  • the present invention needs to install the caps one by one, the installation process is vast, each cap needs to be installed vertically, the installation requirements are high, and the regular maintenance cost of the caps in the tower is high.
  • the present invention discloses a packed tray, and the specific technical solutions are as follows:
  • the packed tray comprises a tray body, wherein the tray body comprises two layers vertically parallel, and a plurality of valve sheets are disposed on opposite sides of the two-layer tray body, and one end of the valve sheet is fixed to the tray body Connected, the other end is suspended, the two layers of the tray body are provided with a filler in the middle, the middle of the valve sheet is arched toward the filler, the filler is obliquely disposed between the two layers of the tray body, and the filler is buried It is filled with a plurality of baffles having a sawtooth shape in a longitudinal section, and adjacent baffles are arranged in parallel.
  • baffles are connected by a plurality of ropes passing through the baffles, and the ropes between the adjacent two baffles are pierced with a spacer tube, which is made of a hard material.
  • baffles are made of a hard material, and all the baffles are of the same specification.
  • valve plates are located in the gaps between adjacent baffles.
  • a longitudinal fixing ring is disposed around the two-layer tray body, and two ends of the fixing ring are respectively connected to the tray body.
  • a locking hole is disposed around the tray body, and two ends of the fixing ring are respectively provided with a locking block extending parallel to the fixing ring toward the outside of the two ends, and the locking block is detachably buckled in the locking hole in.
  • the invention is installed and fixed in a gas-liquid mass transfer tower as a whole structure, and the tray body is horizontally disposed in the gas-liquid mass transfer tower, the periphery of the tray body is fixed with the inner wall of the gas-liquid mass transfer tower, the tray body and the gas liquid
  • the mass transfer towers are perpendicular to each other.
  • the tray of the present invention is provided with several layers in the tower according to the height of the gas-liquid mass transfer tower, and an appropriate distance is set between each tray.
  • the gaseous medium enters the tower from the bottom of the gas-liquid mass transfer tower and is discharged from the top of the gas-liquid mass transfer tower.
  • the liquid medium enters the tower from the top of the gas-liquid mass transfer tower, from the bottom of the gas-liquid mass transfer tower. discharge.
  • the gaseous medium and the liquid medium are in contact in the gas-liquid mass transfer tower, and a mass transfer process takes place.
  • the gaseous medium enters the tower body from the bottom of the gas-liquid mass transfer tower, and the gas first reaches the lower surface of the tray body.
  • the gas can only enter the packing through the valve piece.
  • the body of the tray has a certain hindrance to the gas, reducing the flow velocity of the gas.
  • the gas enters the packing, and the gas can only rise along the bending orbit of the baffle, prolonging the gas in the gas.
  • the fixing ring and the tray body are detachably connected, and when the filler is clogged inside, or the filler is used for a period of time, the aging occurs, the fixing ring and the tray body can be removed, and the packing is replaced, so that the tray is replaced.
  • the main body and the fixed ring can be used for multiple times, improve the utilization rate of raw materials, avoid the use of products at one time, and improve the use value of the products.
  • Figure 1 is a schematic view of the structure of the present invention
  • FIG. 1 is a schematic view of the structure of the present invention. It can be seen from the figure that the packing type 3 tray comprises a tray body 1, and the tray body 1 comprises two layers which are parallel in parallel, and opposite sides of the two-layer tray body 1 A plurality of valve plates 2 are disposed. One end of the valve plate 2 is fixedly connected with the tray body 1 and the other end is suspended. The two layers of the tray body 1 are provided with a filler 3 in the middle thereof, and the middle of the valve plate 2 is directed toward the filler 3 arch.
  • the packing 3 is obliquely disposed between the two layers of the tray body 1, and the packing 3 comprises a plurality of baffles 4 having a zigzag shape in a longitudinal section, and the adjacent baffles 4 are arranged in parallel.
  • the two parallel layers of the tray body 1 sandwich the filler 3 so that the liquid or gas will always meet in the filler 3 during the normal ascending or descending flow in the gas-liquid mass transfer tower, and in the filler 3 The longer staying inside allows the gas and liquid to fully contact the mass transfer and improve the mass transfer effect.
  • the baffle 4 is designed in a zigzag shape to extend the path through which the liquid and gas pass through the packing 3, thereby extending the contact time of the gas and the liquid. The passage of gas and liquid into and out of the tray body 1 in the gap between the valve plate 2 and the tray body 1 can effectively prevent the gas or liquid from entering and exiting the tray body 1 too fast, and slow the flow rate of the gas and the liquid.
  • baffles 4 are connected by a plurality of ropes 5 passing through the baffles 4, and the ropes 5 between the adjacent two baffles 4 are pierced with a spacing tube 6, which is Made of hard materials.
  • the rope 5 pierces the baffles 4 such that a plurality of baffles 4 are formed integrally, and the spacing tubes 6 block the adjacent baffles 4 from being in close contact so that the adjacent baffles 4 are properly positioned
  • the gap allows gas and liquid to pass through the gap 3 through the gap.
  • the baffles 4 are made of a hard material, and all the baffles 4 have the same specifications.
  • the hard material can prevent the baffle 4 from being deformed, and the baffles 4 of the same specification can ensure that the mass transfer effect of the gas and the liquid at any position of the present invention is the same, and the effect of uniform mass transfer is achieved.
  • the valve plate 2 is located in a gap between adjacent baffles 4.
  • the gas or liquid can pass directly into the gap between the baffles 4 after passing through the valve sheet 2.
  • the two-layer tray body 1 is provided with a longitudinal fixing ring 7 around the two ends, and the two ends of the fixing ring 7 are respectively respectively
  • the body of the tray body 1 is provided with a snap hole 8 .
  • the two ends of the fixing ring 7 are respectively provided with a buckle block 9 extending parallel to the fixing ring 7 toward the outside of the two ends, and the buckle block 9 can be The detaching ground is snapped into the snap hole 8.
  • the fixing ring 7 seals the packing 3 between the two layers of the tray body 1, and the detachable connection is convenient, and the fixing ring 7 is easily removed to replace the packing 3.
  • the technical means disclosed in the solution of the present invention is not limited to the technical means disclosed by the above technical means, and includes a technical solution composed of any combination of the above technical features.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Abstract

填料式塔板，包括塔板本体（1），塔板本体（1）包括上下平行的两层，两层的塔板本体（1）相对侧设置有若干个阀片（2），阀片（2）一端与塔板本体（1）固定连接，另一端悬空，两层的塔板本体（1）中间设置有填料（3），阀片（2）的中间向着填料（3）拱起，填料（3）倾斜设置在两层的塔板本体（1）之间，填料（3）埋填有若干个纵向截面呈锯齿形状的折流板（4），相邻的折流板（4）平行布置。

Description

填料式塔板 技术领域
本发明涉及填料式塔板，它是一种安装在化工塔设备中的塔板，属于化工设备领域。
背景技术
塔设备是石油和化工领域常用的一种气液、液液接触传质设备，主要包括板式踏板和填料式塔板。高效填料踏板效果高，并且生产能力大，但是由于造价高，而且不适合于高压和易结焦的场合。相对于填料塔，普通板式塔由于其造价低廉，在常压和高压工况中国得到广泛的应用。
但是在大液量吸收、精馏等工况中由于液气比非常大，例如水水洗脱碳的液气摩尔比高达100以上。对于此类工况，普通的板式塔往往也能发挥优势：塔板上的受液区往往占据了很大塔截面积，造成塔的处理能力低。如采用填料塔，为了能通过大液量，塔径会设计得很大，气体以极低的气速通过填料层，传质小效率低，用水量大，能耗高。
固定浮阀塔板具有生产能力大，塔板效率高，加工及维护成本低等优点，在石油化工领域有着广泛的应用。目前，工业上的固定浮阀塔板主要为圆形固定浮阀和条形固定浮阀两种，这两种固定浮阀主要有以下特征：直接在塔板平面上冲出圆形和条形突起，将其边缘开口作为气相通道，阀片前后各有一条阀腿与塔板相连接，来支撑阀片，阀腿与塔板平面的夹角约为90度。对于圆阀，气体出口为一圆弧，从出口前半部喷出的气体对板上液流有一定的推动作用，而从出口后半部喷出的液体对板上液流有阻止作用，前后两种作用相互削弱。对于条形固定浮阀，气体喷出方向与液流方向垂直，不但没有推液作用，而且，相邻的两个阀片喷出的气体方向相对，造成严重的对喷现象，容易引起返混和雾沫夹带，削弱塔板的传质功能，降低塔板效率。舌形塔板上设有倾斜的舌孔，使喷出气流的方向接近水平，因而雾沫夹带大为减少，同时气流对液流有推进作用，因此气液流通过能力均较高，气体通量大，液面落差小，无返混现象，能够降低塔板压降。舌形塔板具有塔板效率高，板上液层较薄，塔板压力降小的优点。但是舌形塔板对负荷波动的适应能力差，操作弹性小，严重的气相夹带现象可能导致板效率下降，同时由于塔板上液层太薄，液体停留时间短，气液接触不充分，板效率显著降低。
塔板和填料复合主要有溢流式塔板复合填料和穿流式塔板复合填料，由于穿流式塔板结构简单、易于填料复合，是最为理想的塔板填料复合形式。但现有穿流塔板复合填料，由于规整填料的液泛使复合塔板的弹性和负荷能力受到限制。
发明人经过检索发现专利号200510094252.6公开了菱形固定浮阀。但是由于两个阀腿的存在，对喷和返混现象不能完全解决。在石油化工、石油炼制、化工、轻工、环保、医药及原子能等工业部门，塔板和填料广泛应用于蒸馏、吸收、萃取、吸收、洗涤、冷却等化工单元过程。填料具有分离效率高、压降小、处理能力大等优点，但成本较大，操作弹性小，对配套塔内件要求高；塔板操作弹性大、抗堵塞、成本低、分离效率相对较大，但压降将较大，处理能力较低。塔板按有无降液管可分为溢流式塔板和穿流式塔板，相比之下，现有穿流式 塔板结构简单，塔内空间利用率高，成本低，处理能力大，但汽液接触时间短，传质效率低，操作弹性小。理想的塔内件应同时具有低压降、高效率、大操作弹性、抗堵塞、低成本、大处理能力和塔内空间利用率高的特性。将塔板和填料复合是实现理想塔内件的有效途径之一。纤维束填料是一种新近开发的气液相均为连续相的高表面积挂网式柔性填料，液泛气速高达8m/s以上，传质效率高，压降仅为普通规整填料的1/2-1/3。
发明人经过检索还发现专利201310401260.5，专利名称为垂直吹膜塔板，它包括一水平塔板和若干个帽罩；水平塔板上设有若干个板孔，板孔之间设有间距；孔板的数量与所述帽罩的数量相等；帽罩包括两端开口的垂直筒、顶盖和底托，顶盖和所述底托分别设置于所述垂直筒的上开口端和下开口端处，且顶盖和所底托与所述垂直筒之间均设有间隙；垂直筒固定于所述板孔内，且垂直筒与所述水平塔板之间设有间隙；垂直筒的横截面的形状和底座的形状均与所述板孔的形状相同，且顶盖在水平面上的投影可遮罩所述垂直筒。本发明可以使气体以水平吹破液膜的形式通过塔板，相比传统塔板不需要克服液层静压力，所以塔板压降小。但是本发明需要逐个安装帽罩，安装工程浩大，每个帽罩均需垂直安装，安装的要求高，塔内帽罩的定期检修成本高。
发明内容
为了解决上述存在的问题，本发明公开了填料式塔板，具体的技术方案如下：
填料式塔板，包括塔板本体，其特征是所述塔板本体包括上下平行的两层，所述两层的塔板本体相对侧设置有若干个阀片，阀片一端与塔板本体固定连接，另一端悬空，所述两层的塔板本体中间设置有填料，所述阀片的中间向着填料拱起，所述填料倾斜设置在两层的塔板本体之间，所述填料内埋填有若干个纵向截面呈锯齿形状的折流板，相邻的折流板平行布置。
所有的折流板之间通过若干根穿过折流板的绳子连接，位于相邻的两个折流板之间的绳子上穿有间隔管，所述间隔管为硬质材质制作而成。
所述折流板为硬质材质制作而成，所有折流板规格一致。
所述阀片位于相邻的折流板之间的缝隙中。
所述两层的塔板本体四周设置有纵向的固定圈，固定圈的两端分别于塔板本体连接。
所述塔板本体的四周设置有卡扣孔，固定圈的两端分别设置有与固定圈平行的向着两端外侧延伸的卡扣块，所述卡扣块可拆卸地卡扣在卡扣孔中。
本发明的工作原理和有益效果是：
本发明作为一个整体结构安装固定在气液传质塔内，塔板本体水平设置在气液传质塔内，塔板本体的四周与气液传质塔的内壁固定，塔板本体与气液传质塔互为垂直。
本发明的塔板根据气液传质塔的高度在塔内设置若干层，每层塔板之间设置预留适当的距离。
使用过程中，气体介质从气液传质塔的底部进入塔内，从气液传质塔的顶部排出，液体介质从气液传质塔的顶部进入塔内，从气液传质塔的底部排出。气体介质和液体介质在气液传质塔中接触，发生传质过程。
气体介质从气液传质塔的底部进入到塔体内，气体首先达到塔板本体的下表面， 气体只能通过阀片进入到填料中，塔板本体对气体有一定的阻碍作用，降低气体的流速，气体进入填料中，气体只能顺着折流板的弯折轨道上升，延长了气体在填料中的时间，当液体从气液传质塔的顶部喷淋到塔体内，液体滴落到塔板本体，液体也只能通过阀片进入到填料中，液体只能顺着折流板的弯折轨道下降，液体和气体在填料中充分接触，传质高效、均匀。
本发明，固定圈与塔板本体为可拆卸连接，当填料内部发生堵塞等问题，或者填料使用一段时候后，发生老化，可以将固定圈与塔板本体拆除开来，更换填料，使得塔板本体和固定圈等能够实现多次使用，提高原料的利用率，避免一次性使用产品，提高产品的使用价值。
附图说明
图1是本发明的结构示意图，
附图标记列表：1-塔板本体，2-阀片，3-填料，4-折流板，5-绳子，6-间隔管，7-固定圈，8-卡扣孔，9-卡扣块。
具体实施方式
下面结合附图和具体实施方式，进一步阐明本发明。应理解下述具体实施方式仅用于说明本发明而不用于限制本发明的范围。
图1是本发明的结构示意图，由图可见，本填料3式塔板，包括塔板本体1，所述塔板本体1包括上下平行的两层，所述两层的塔板本体1相对侧设置有若干个阀片2，阀片2一端与塔板本体1固定连接，另一端悬空，所述两层的塔板本体1中间设置有填料3，所述阀片2的中间向着填料3拱起，所述填料3倾斜设置在两层的塔板本体1之间，所述填料3包括若干个纵向截面呈锯齿形状的折流板4，相邻的折流板4平行布置。本发明，两层平行的塔板本体1中间夹着填料3，使得液体或气体要在气液传质塔中正常上升流动或下降流动过程中，总会在填料3中相遇，并在填料3内停留较长的时间，使得气体和液体能够充分接触传质，提高传质效果。把折流板4设计成锯齿形状，延长液体和气体穿过填料3所需要经过的路径，进而延长气体和液体的接触时间。阀片2与塔板本体1之间的空隙上气体和液体进出塔板本体1的通口，能有效防止气体或液体进出塔板本体1的速度过快，减缓气体和液体的流速。
所有的折流板4之间通过若干根穿过折流板4的绳子5连接，位于相邻的两个折流板4之间的绳子5上穿有间隔管6，所述间隔管6为硬质材质制作而成。绳子5将折流板4穿连起来，使得若干个折流板4形成一个整体，间隔管6阻挡相邻的折流板4紧贴在一起，使得相邻的折流板4之间有适当的间隙，让气体和液体在能通过该间隙穿过填料3。
所述折流板4为硬质材质制作而成，所有折流板4规格一致。硬质材质能够防止折流板4变形，相同规格的折流板4能确保气体和液体经过本发明的任何位置的传质效果是一样的，起到均匀传质的效果。
所述阀片2位于相邻的折流板4之间的缝隙中。使得气体或液体经过阀片2后能直接进入折流板4之间的缝隙中。
所述两层的塔板本体1四周设置有纵向的固定圈7，固定圈7的两端分别于塔板本 体1连接；塔板本体1的四周设置有卡扣孔8，固定圈7的两端分别设置有与固定圈7平行的向着两端外侧延伸的卡扣块9，所述卡扣块9可拆卸地卡扣在卡扣孔8中。固定圈7将填料3封在两层塔板本体1之间，可拆卸的连接方便，便于拆除固定圈7来更换填料3。
本发明方案所公开的技术手段不仅限于上述技术手段所公开的技术手段，还包括由以上技术特征任意组合所组成的技术方案。
以上述依据本发明的理想实施例为启示，通过上述的说明内容，相关工作人员完全可以在不偏离本项发明技术思想的范围内，进行多样的变更以及修改。本项发明的技术性范围并不局限于说明书上的内容，必须要根据权利要求范围来确定其技术性范围。

Claims (6)

  1. 填料式塔板，包括塔板本体，其特征是所述塔板本体包括上下平行的两层，所述两层的塔板本体相对侧设置有若干个阀片，阀片一端与塔板本体固定连接，另一端悬空，所述两层的塔板本体中间设置有填料，所述阀片的中间向着填料拱起，所述填料倾斜设置在两层的塔板本体之间，所述填料埋填有若干个纵向截面呈锯齿形状的折流板，相邻的折流板平行布置。
  2. 根据权利要求1所述的填料式塔板，其特征是所有的折流板之间通过若干根穿过折流板的绳子连接，位于相邻的两个折流板之间的绳子上穿有间隔管，所述间隔管为硬质材质制作而成。
  3. 根据权利要求2所述的填料式塔板，其特征是所述折流板为硬质材质制作而成，所有折流板规格一致。
  4. 根据权利要求3所述的填料式塔板，其特征是所述阀片位于相邻的折流板之间的缝隙中。
  5. 根据权利要求4所述的填料式塔板，其特征是所述两层的塔板本体四周设置有纵向的固定圈，固定圈的两端分别与塔板本体连接。
  6. 根据权利要求5所述的填料式塔板，其特征是所述塔板本体的四周设置有卡扣孔，固定圈的两端分别设置有与固定圈平行的向着两端外侧延伸的卡扣块，所述卡扣块可拆卸地卡扣在卡扣孔中。
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