CN202546112U

CN202546112U - Electrofusion sleeve with detection planes

Info

Publication number: CN202546112U
Application number: CN2012200104581U
Authority: CN
Inventors: 师俊; 施建峰; 郑津洋; 郭伟灿
Original assignee: Zhejiang University ZJU
Current assignee: Zhejiang University ZJU
Priority date: 2012-01-11
Filing date: 2012-01-11
Publication date: 2012-11-21
Anticipated expiration: 2022-01-11

Abstract

The utility model relates to plastic pipe welding technology and aims to provide an electric fusion sleeve with a detection plane. The electrofusion sleeve includes a tubular main body, and N strip-shaped rectangular detection planes are arranged on the outer wall of the main body; the detection plane has two symmetrical axes, and the long symmetrical axis is parallel to the central axis of the electrofusion sleeve , and the detection plane is tangent to a coaxial cylindrical surface of the electrofusion sleeve. The utility model can be combined with the existing ultrasonic detection method of the electrofusion joint to realize the purpose of conveniently and accurately detecting the electrofusion joint in service by using a common plane probe. The ultrasonic detection result near the welding interface of the electric fusion joint welded by the electric fusion sleeve of the utility model is very clear, there is no redundant clutter, and the multiple echo signals of the metal wire are also very clear and neat.

Description

Electrofusion sleeve with detection plane

技术领域 technical field

本实用新型涉及塑料管道焊接技术，特别涉及带检测平面的新型电熔套筒。The utility model relates to plastic pipe welding technology, in particular to a novel electrofusion sleeve with a detection plane.

背景技术 Background technique

近年来，我国能源结构和政策的调整以及西气东输等重要能源战略计划的进一步实施，给我国的管道行业带来巨大的发展空间。塑料管道和热塑性增强塑料复合管以其优异的综合力学性能在各行业中得到快速的发展和应用，其主要代表性产品有聚乙烯管、聚丙烯管、聚氯乙烯管、铝塑复合管、钢塑复合管、玻璃纤维增强塑料管等。电熔焊接是塑料管和复合管最主要的连接方式之一，尤其在某些复杂恶劣环境(如高压、泥浆等)下使用的复合管道，电熔焊接几乎是唯一适用的连接方法。In recent years, the adjustment of my country's energy structure and policies and the further implementation of important energy strategic plans such as the West-East Gas Pipeline have brought huge room for development to my country's pipeline industry. Plastic pipes and thermoplastic reinforced plastic composite pipes have been rapidly developed and applied in various industries due to their excellent comprehensive mechanical properties. The main representative products include polyethylene pipes, polypropylene pipes, polyvinyl chloride pipes, aluminum-plastic composite pipes, Steel-plastic composite pipe, glass fiber reinforced plastic pipe, etc. Electrofusion welding is one of the most important connection methods for plastic pipes and composite pipes. Especially for composite pipes used in some complex and harsh environments (such as high pressure, mud, etc.), electrofusion welding is almost the only applicable connection method.

对任何管道系统，管道接头都是管道系统的薄弱环节。对于输送石油、天然气等能源介质的塑料管道或塑料复合管道，一旦发生管道接头泄漏失效，将造成火灾、爆炸等恶劣事故，直接危及到管道沿线人员的生命财产安全。因此，电熔接头的安全性和可靠性受到越来越多的关注。As with any piping system, pipe joints are the weak link of the piping system. For plastic pipelines or plastic composite pipelines that transport oil, natural gas and other energy media, once the pipeline joints leak and fail, it will cause severe accidents such as fire and explosion, directly endangering the life and property safety of people along the pipeline. Therefore, the safety and reliability of EF joints have received more and more attention.

美国西北太平洋国家实验室Steven R.Doctor等在美国能源部的支持下，开发了基于超声TOFD技术的塑料管道接头超声检测方法，目前已开始进行工程验证。与此同时，浙江大学郑津洋等在科技部国家“十一五”、“十二五”科技支撑计划的支持下，研发出一系列针对塑料管道电熔接头的超声检测方法以及配套设备。实践表明，采用超声相控阵技术结合B扫描实时成像方法可以有效地检测出电熔接头内部的孔洞、熔合面夹杂、冷焊等缺陷。这些技术和装备虽然已能够满足当前应用的各种电熔接头的超声检测需求，然而在实际应用过程中仍存在一些困难，其中最主要的困难是超声检测探头与待检测塑料管道的界面耦合问题。With the support of the U.S. Department of Energy, Steven R.Doctor of the Pacific Northwest National Laboratory in the United States has developed an ultrasonic testing method for plastic pipe joints based on ultrasonic TOFD technology, and has begun engineering verification. At the same time, Zheng Jinyang of Zhejiang University, with the support of the national "Eleventh Five-Year Plan" and "Twelfth Five-Year Plan" science and technology support plan of the Ministry of Science and Technology, developed a series of ultrasonic testing methods and supporting equipment for plastic pipe electrofusion joints. Practice has shown that the use of ultrasonic phased array technology combined with B-scan real-time imaging method can effectively detect defects such as holes inside the electrofusion joint, inclusions on the fusion surface, and cold welding. Although these technologies and equipment have been able to meet the ultrasonic testing requirements of various electrofusion joints currently used, there are still some difficulties in the actual application process, the most important of which is the interface coupling between the ultrasonic testing probe and the plastic pipe to be tested. .

通常，超声检测技术人员的经验是采用耦合剂来减小电熔套筒与探头配合不紧密造成的界面声反射。对于在金属管道的超声检测，在表面涂抹耦合剂就可以使入射声强度达到检测要求。但是塑料管通常必须采用相控阵探头，探头与管材直径的比例与金属管道的探头与直径比要大，因此弧度的影响更加显著，即使在表面涂抹耦合剂，仍然还会产生很大的界面声反射，超声波能量在界面损失较严重，影响检测效果。Generally, the experience of ultrasonic testing technicians is to use couplant to reduce the interface acoustic reflection caused by the loose fit between the electrofusion sleeve and the probe. For ultrasonic testing on metal pipes, applying coupling agent on the surface can make the incident sound intensity meet the testing requirements. However, plastic pipes usually have to use phased array probes. The ratio of the probe to the diameter of the pipe is larger than that of metal pipes, so the influence of the curvature is more significant. Even if the couplant is applied to the surface, there will still be a large interface. Acoustic reflection, the loss of ultrasonic energy at the interface is serious, which affects the detection effect.

众所周知，塑料管材普遍具有粘弹性。当超声波在塑料中传播时，衰减相当严重。因此，超声探头与待检测塑料管道的界面耦合质量直接关系到超声检测效果。为了检测适应不同管径的聚乙烯管道接头，郑津洋等开发了具有不同弧度的特质超声探头，使得在超声检测过程中，超声探头始终能够贴合管材表面，保证界面耦合效果。It is well known that plastic pipes are generally viscoelastic. When ultrasonic waves propagate in plastic, the attenuation is quite serious. Therefore, the interface coupling quality between the ultrasonic probe and the plastic pipe to be tested is directly related to the ultrasonic testing effect. In order to detect polyethylene pipe joints suitable for different pipe diameters, Zheng Jinyang et al. developed special ultrasonic probes with different radians, so that during the ultrasonic testing process, the ultrasonic probe can always fit the surface of the pipe to ensure the interface coupling effect.

然而，具有曲面的超声探头不仅需要对声场进行精确的设计计算，而且实际加工非常困难，加工费用昂贵。针对不同尺寸规格的塑料管道接头需要特制超声探头，不仅增加了设备成本，而且也给现场检测带来很大不便。本文提出一种带超声检测平面的新型电熔套筒结构，可弥补现有技术的不足，实现采用平面探头就可以对电熔接头进行有效检测的目的。However, an ultrasonic probe with a curved surface not only requires accurate design calculation of the sound field, but also is very difficult and expensive to manufacture in practice. Plastic pipe joints of different sizes require special ultrasonic probes, which not only increases equipment costs, but also brings great inconvenience to on-site testing. This paper proposes a new type of electrofusion sleeve structure with an ultrasonic detection plane, which can make up for the shortcomings of the existing technology and realize the purpose of effectively testing the electrofusion joint with a flat probe.

实用新型内容 Utility model content

本实用新型要解决的技术问题是，提出一种新型的塑料或塑料复合管道电熔套筒结构，结合现有的电熔接头超声检测方法，实现采用普通平面探头就可以对在役电熔接头进行方便、准确检测的目的。The technical problem to be solved by the utility model is to propose a new type of plastic or plastic composite pipe electrofusion sleeve structure, combined with the existing ultrasonic detection method of electrofusion joints, to realize that the electrofusion joints in service can be detected by using ordinary flat probes The purpose of convenient and accurate detection.

本实用新型采用的技术方案是：The technical scheme that the utility model adopts is:

提供一种带检测平面的电熔套筒，包括管状的主体，其特征在于，在主体的外壁面上设有N个长条状矩形的检测平面；检测平面有两条对称轴，其长的对称轴与电熔套筒的中心轴线平行，且检测平面与电熔套筒的某共轴圆柱面相切。An electrofusion sleeve with a detection plane is provided, which includes a tubular main body, and is characterized in that N strip-shaped rectangular detection planes are arranged on the outer wall of the main body; the detection plane has two symmetrical axes, and the long The axis of symmetry is parallel to the central axis of the electrofusion sleeve, and the detection plane is tangent to a coaxial cylindrical surface of the electrofusion sleeve.

本实用新型中，所述检测平面的切削深度d_cut根据下述方式确定：In the present utility model, the cutting depth d _cut of the detection plane is determined according to the following manner:

${d d}_{cut cut} = = {R R}_{o o} - - \sqrt{{R R}_{o o}^{22} - - \frac{11}{44} {l l}_{j j}^{22}} - - - - - - ((11))$

式中，R_o为电熔套筒的外径，l_j为检测平面的宽度；In the formula, R _o is the outer diameter of the electrofusion sleeve, and l _j is the width of the detection plane;

检测平面的宽度大于或等于对所述电容套筒进行检测的超声检测探头的宽度，故所述检测平面的切削深度d_cut应满足：The width of the detection plane is greater than or equal to the width of the ultrasonic detection probe for detecting the capacitance sleeve, so the cutting depth d _cut of the detection plane should satisfy:

${d d}_{cut cut} &GreaterEqual; &Greater Equal; {R R}_{00} - - \sqrt{{R R}_{00}^{22} - - \frac{11}{44} {l l}_{j j 00}^{22}} - - - - - - ((22))$

式中，R_o为电熔套筒的外径，l_j0为检测探头的宽度；In the formula, R _o is the outer diameter of the electrofusion sleeve, and l _j0 is the width of the detection probe;

所述切削深度d_cut还应同时满足下述条件：The depth of cut d _cut should also meet the following conditions:

当电熔套筒与配用管材均由相同MRS分级的聚乙烯制造时，d_cut≤t-e；When the electrofusion sleeve and the matching pipe are made of polyethylene with the same MRS classification, d _cut ≤ te;

当电熔套筒的原料为PE100等级的聚乙烯，而管材原料为PE80时，d_cut≤t-0.8e；When the material of the electrofusion sleeve is PE100 grade polyethylene and the pipe material is PE80, d _cut ≤t-0.8e;

当电熔套筒的原料为PE80等级的聚乙烯，而管材原料为PE100时，d_cut≤t-e/0.8；When the material of the electrofusion sleeve is PE80 grade polyethylene and the pipe material is PE100, d _cut ≤te/0.8;

所述t为电熔套筒主体的壁厚，e为电熔套筒的配用管材的壁厚。The t is the wall thickness of the main body of the electrofusion sleeve, and e is the wall thickness of the matching pipe of the electrofusion sleeve.

由于检测平面的宽度必须大于或等于检测探头的宽度l_j0，故N存在最大值N_max，N为小于或等于N_max的自然数。不同的检测探头宽度l_j0对应不同的检测平面最大值N_max。Since the width of the detection plane must be greater than or equal to the width l _j0 of the detection probe, N has a maximum value N _max , and N is a natural number less than or equal to N _max . Different detection probe widths l _j0 correspond to different detection plane maximum values N _max .

${N N}_{max max} = = [[\frac{π π}{arcsin arcsin ((\frac{{l l}_{j j 00}}{{22 R R}_{o o}}))}]] - - - - - - ((33))$

每一个N都对应一个最大切削深度

假设检测平面之间都是两两相接的，则有切削深度最大值

Each N corresponds to a maximum depth of cut

Assuming that the detection planes are connected in pairs, there is a maximum depth of cut

${d d}_{cut cut}^{max max} = = {R R}_{o o} ((11 - - \sqrt{11 - - {sin sin}^{22} ((\frac{π π}{N N}))}))$

则切削深度d_cut需要满足

即Then the depth of cut d _cut needs to satisfy

Right now

${d d}_{cut cut} \leq \leq {R R}_{o o} ((11 - - \sqrt{11 - - {sin sin}^{22} ((\frac{π π}{N N}))})) - - - - - - ((44))$

综上所述，检测平面的切削深度d_cut根据下述方式确定：To sum up, the cutting depth d _cut of the detection plane is determined according to the following method:

式中，R_o为电熔套筒的外径，l_j0为检测探头的宽度，t为电熔套筒主体的壁厚，e为电熔套筒的配用管材壁厚，N为检测平面数量；In the formula, R _o is the outer diameter of the electrofusion sleeve, l _j0 is the width of the detection probe, t is the wall thickness of the main body of the electrofusion sleeve, e is the wall thickness of the matching pipe of the electrofusion sleeve, and N is the detection plane quantity;

本实用新型中，检测平面数量N通过相对周长计算法来确定：In the utility model, the detection plane quantity N is determined by the relative perimeter calculation method:

设所述电熔套筒的公称直径为D；参照标准《GB 15558.2-2005燃气用埋地聚乙烯(PE)管道系统第2部分：管件》，将DN90电熔套筒的检测平面数量作为计数依据，令其检测平面为x个，x为小于或等于N_max的自然数。作为计数依据，x值一般取1，2，4，6，8。Let the nominal diameter of the electrofusion sleeve be D; refer to the standard "GB 15558.2-2005 Buried Polyethylene (PE) Piping System for Gas Use Part 2: Pipe Fittings", and count the number of detection planes of the DN90 electrofusion sleeve As a basis, the number of detection planes is x, and x is a natural number less than or equal to N _max . As a basis for counting, x values generally take 1, 2, 4, 6, 8.

x的具体数值可根据管件的安全要求与加工成本确定；The specific value of x can be determined according to the safety requirements and processing costs of pipe fittings;

当D小于等于90mm时，When D is less than or equal to 90mm,

N₀＝x (6)N ₀ =x (6)

当D等于90mm的整数倍时，When D is equal to an integral multiple of 90mm,

${N N}_{00} = = \frac{D D.}{9090} x x - - - - - - ((77))$

当D大于90mm而非其整数倍时，N将依据N₀的大小从表1中选取：When D is greater than 90mm instead of its integral multiple, N will be selected from Table 1 according to the size of N ₀ :

${N N}_{00} = = [[\frac{D D.}{9090} gx gx]] + + 11 - - - - - - ((88))$

(注：[]是取整符号，[a]表示取不大于a的最大整数)(Note: [] is a rounding symbol, [a] means taking the largest integer not greater than a)

表1检测平面基本数量表Table 1 Basic Quantity Table of Detection Plane

检测平面基本数量选取值N Select value N for the basic number of detection planes N₁ N₂ N₃ N₄ N₅ N₆ N₇ N₈ N ₁ N ₂ N ₃ N ₄ N ₅ N ₆ N ₇ N ₈ 2 4 6 8 10 12 16 20 2 4 6 8 10 12 16 20

N₀≤N₁时，N＝N₁；When N ₀ ≤ N ₁ , N=N ₁ ;

N_i＜N₀≤N_i+1时，N＝N_i+1，i为1，2，3，4，5，6，7；When N _i <N ₀ ≤N _i+1 , N=N _i+1 , i is 1, 2, 3, 4, 5, 6, 7;

N₀＞N₈时，N＝N₈；When N ₀ >N ₈ , N=N ₈ ;

作为计数依据，x值取1，2，4，6或8。As counting basis, x value takes 1, 2, 4, 6 or 8.

本实用新型中，所述检测平面的宽度大于或等于对所述电容套筒进行检测的超声检测探头的宽度，检测平面的长度大于或等于所述超声检测探头的长度且小于或等于电熔套筒的轴向长度。In the utility model, the width of the detection plane is greater than or equal to the width of the ultrasonic detection probe for detecting the capacitance sleeve, and the length of the detection plane is greater than or equal to the length of the ultrasonic detection probe and less than or equal to the electrofusion sleeve Axial length of the barrel.

当然，检测平面的数量与分布方式也可以做出不同的调整，检测平面的数量多少与分布的密集程度将随不同的电熔套筒安全要求、缺陷可能存在的数量、缺陷可能存在的位置而变化，即电熔套筒外壁上的检测平面的数量可以将基本数量作为起点再做增加调整。电熔套筒的安全要求高，则检测平面的数量就多，电熔套筒在某一区域的缺陷发生的可能性大、数量多，则检测平面在该区域的密集程度就高；反之，若电熔套筒的安全要求相对较低，则检测平面数量可减少，若电熔套筒发生缺陷的可能性小，则检测平面的密集程度可下调；若缺陷分布没有明显的分布特征，则可以使检测平面均匀分布于电熔套筒的外壁面。Of course, the number and distribution of detection planes can also be adjusted differently. The number of detection planes and the density of distribution will vary with the safety requirements of different electrofusion sleeves, the number of possible defects, and the possible positions of defects. Changes, that is, the number of detection planes on the outer wall of the electrofusion sleeve can be increased and adjusted based on the basic number as a starting point. If the safety requirements of the electrofusion sleeve are high, the number of detection planes will be large, and the possibility and quantity of defects in a certain area of the electrofusion sleeve will be high, so the density of detection planes in this area will be high; on the contrary, If the safety requirements of the electrofusion sleeve are relatively low, the number of detection planes can be reduced. If the possibility of defects in the electrofusion sleeve is small, the density of detection planes can be reduced; if the defect distribution has no obvious distribution characteristics, then The detection planes can be evenly distributed on the outer wall surface of the electrofusion sleeve.

电熔套筒的检测平面有两种加工方式，一种是采用修改的注塑模具，以一次成型的方式生产出带检测平面的电熔套筒；另一种是对普通电熔套筒进行二次机械加工，即将其圆柱形外壁面通过铣削或其他机械加工方式加工出检测平面。注塑成型方便、快捷，可用于大批量生产检测平面较多且均匀分布的电熔套筒；铣削加工工序多，但可以较自由地对现有电熔套筒进行调整、改造，使检测平面能按照设计人员要求、以更多样的方式分布于电熔套筒上。本实用新型专利中的相对周长计算法主要用于确定注塑模具一次成型方式中检测平面的数量，而对于二次机械加工方式，检测平面的数量、分布方式可以根据待检测管线的安全要求、加工成本来确定。例如，按照本实用新型中提出的方法确定的检测平面数量为2，但考虑加工成本的限制，只加工其中一个平面，也属于本实用新型保护的内容。两种加工方式中的检测平面相关加工参数都应符合方程组(5)的规定。There are two processing methods for the detection plane of the electrofusion sleeve, one is to use a modified injection mold to produce an electrofusion sleeve with a detection plane in a one-time molding method; the other is to perform secondary processing on an ordinary electrofusion sleeve Secondary mechanical processing, that is, the cylindrical outer wall surface is processed into a detection plane by milling or other mechanical processing methods. Injection molding is convenient and fast, and can be used for mass production of electrofusion sleeves with more detection planes and uniform distribution; there are many milling processes, but the existing electrofusion sleeves can be adjusted and modified relatively freely, so that the detection planes can be According to the designer's requirements, it is distributed on the electrofusion sleeve in more diverse ways. The relative perimeter calculation method in the utility model patent is mainly used to determine the number of detection planes in the primary molding mode of the injection mold, and for the secondary machining mode, the number and distribution of the detection planes can be based on the safety requirements of the pipeline to be detected, The processing cost is determined. For example, the number of detection planes determined according to the method proposed in the utility model is 2, but considering the limitation of processing cost, only one of the planes is processed, which also belongs to the protection content of the utility model. The processing parameters related to the detection plane in the two processing methods should meet the requirements of equation group (5).

本实用新型专利中电熔套筒的适用范围包括塑料或塑料复合管道电熔套筒。The scope of application of the electrofusion sleeve in the utility model patent includes plastic or plastic composite pipe electrofusion sleeves.

本实用新型的有益效果在于：The beneficial effects of the utility model are:

本实用新型能够结合现有的电熔接头超声检测方法，实现采用普通平面探头就可以对在役电熔接头进行方便、准确检测的目的。采用本实用新型的电熔套筒焊制的电熔接头焊接界面附近超声检测结果十分清晰，没有多余杂波，金属丝的多次回波信号也十分清晰、整齐。The utility model can be combined with the existing ultrasonic detection method of the electrofusion joint to realize the purpose of conveniently and accurately detecting the electrofusion joint in service by using a common plane probe. The ultrasonic detection result near the welding interface of the electric fusion joint welded by the electric fusion sleeve of the utility model is very clear, there is no redundant clutter, and the multiple echo signals of the metal wire are also very clear and neat.

图6、7为采用带检测平面的电熔套筒和无检测平面的普通电熔套筒的超声检测结果效果对比。从图7中可以看出，而无检测平面的普通电熔接头在焊接界面处存在一些杂波，金属丝的回波信号相互错杂，多次回波信号也不清晰。Figures 6 and 7 are comparisons of ultrasonic testing results using an electrofusion sleeve with a detection plane and a common electrofusion sleeve without a detection plane. It can be seen from Figure 7 that there are some clutter at the welding interface of the common electrofusion joint without a detection plane, the echo signals of the metal wire are mixed with each other, and the multiple echo signals are not clear.

附图说明 Description of drawings

图1为电熔套筒成型示意图(检测平面总数为4)；Figure 1 is a schematic diagram of forming an electrofusion sleeve (the total number of detection planes is 4);

图2为电熔套筒成型示意图(检测平面总数为8)；Fig. 2 is a schematic diagram of forming an electrofusion sleeve (the total number of detection planes is 8);

图3为电熔套筒成型示意图(检测平面总数为16)；Fig. 3 is a schematic diagram of forming an electrofusion sleeve (the total number of detection planes is 16);

图4为带检测平面的超声检测图(图中没有杂波，金属丝信号清晰、整齐)；Fig. 4 is an ultrasonic detection diagram with a detection plane (there is no clutter in the figure, and the wire signal is clear and neat);

图5为带检测平面的超声检测图(杂波较多，金属丝信号模糊)。Figure 5 is an ultrasonic detection map with a detection plane (more clutter, fuzzy wire signal).

具体实施方式 Detailed ways

下面结合附图对本实用新型专利的具体实施方式进行详细表述。The specific embodiment of the utility model patent is described in detail below in conjunction with accompanying drawing.

实施例1：Example 1:

某一电熔套筒公称直径63mm，长150mm，外径为63mm，内径为49mm，厚度为7mm，配用管材壁厚为5.8mm，超声检测探头宽度为10mm，电熔套筒的材料为PE100级聚乙烯，配用管材的材料为PE80级聚乙烯。An electrofusion sleeve has a nominal diameter of 63mm, a length of 150mm, an outer diameter of 63mm, an inner diameter of 49mm, and a thickness of 7mm. The wall thickness of the matching pipe is 5.8mm. The width of the ultrasonic testing probe is 10mm. The material of the electrofusion sleeve is PE100 Grade polyethylene, and the material used for the pipe is PE80 grade polyethylene.

则电熔套筒检测平面各加工参数如下：The processing parameters of the detection plane of the electrofusion sleeve are as follows:

(1)检测平面长度为150mm；(1) The detection plane length is 150mm;

(2)检测平面数量：(2) Number of detection planes:

由(3)式得到：From formula (3) get:

${N N}_{max max} = = [[\frac{π π}{arcsin arcsin ((\frac{{l l}_{j j 00}}{22 {R R}_{o o}}))}]] = = [[\frac{π π}{arcsin arcsin ((\frac{1010}{22 \times \times 31.5 31.5}))}]] = = 1919$

即当检测平面宽度等于10mm时，电熔套筒外壁面最多可加工出19个检测平面。That is, when the width of the detection plane is equal to 10mm, a maximum of 19 detection planes can be processed on the outer wall of the electrofusion sleeve.

根据相对周长计算法确定DN63电熔套筒的检测平面数量：Determine the number of detection planes for DN63 electrofusion sleeves according to the relative circumference calculation method:

若电熔套筒用于连接输水管，则安全要求较低，可令DN90电熔套筒(DN90电熔套筒N_max＝28)检测平面数量基准取为4，即x＝4。由于DN63电熔套筒公称直径小于90mm，故也取4作为检测平面数量；If the electrofusion sleeve is used to connect the water pipe, the safety requirements are relatively low, and the number of detection planes of the DN90 electrofusion sleeve (DN90 electrofusion sleeve N _max =28) can be set as 4, that is, x=4. Since the nominal diameter of the DN63 electrofusion sleeve is less than 90mm, 4 is also taken as the number of detection planes;

(3)切削深度：(3) Cutting depth:

根据切削深度的规定，Depending on the depth of cut,

$\{\begin{matrix} {d d}_{cut cut} \leq \leq {R R}_{o o} ((11 - - \sqrt{11 - - {sin sin}^{22} ((\frac{π π}{N N}))})) = = 31.5 31.5 ((11 - - \sqrt{11 - - {sin sin}^{22} ((\frac{π π}{44}))})) = = 9.2261 9.2261 mm mm \\ {d d}_{cut cut} &GreaterEqual; &Greater Equal; {R R}_{00} - - \sqrt{{R R}_{00}^{22} - - \frac{11}{44} {l l}_{j j 00}^{22}} = = 31.5 31.5 - - \sqrt{{31.5 31.5}^{22} - - \frac{11}{44} \times \times 1010^{22}} = = 0.3994 0.3994 mm mm \\ {d d}_{cut cut} \leq \leq t t - - 0.8 0.8 {e e}_{n no} = = 77 - - 0.8 0.8 \times \times 5.8 5.8 = = 2.3600 2.3600 mm mm . . \end{matrix}$

切削深度越小对电熔套筒力学性能影响也越小，切削宽度也越小，故切削深度d_cut的取值范围是0.3994≤d_cut≤2.3600。根据切削加工精度，可选取适宜的切削深度，d_cut可取为1mm；The smaller the cutting depth, the smaller the influence on the mechanical properties of the electrofusion sleeve, and the smaller the cutting width, so the value range of the cutting depth d _cut is 0.3994≤d _cut ≤2.3600. According to the cutting precision, the appropriate cutting depth can be selected, and the d _cut can be taken as 1mm;

(4)切削宽度：(4) Cutting width:

则由(1)式可得切削宽度：Then the cutting width can be obtained from formula (1):

${l l}_{j j} = = 22 \sqrt{{R R}_{o o}^{22} - - {(({R R}_{o o} - - {d d}_{cut cut}))}^{22}} = = 22 \times \times \sqrt{{31.5 31.5}^{22} - - {((31.5 31.5 - - 11))}^{22}} = = 15.7480 15.7480 mm mm . .$

该电熔套筒的成型示意图见图1所示。The schematic diagram of the forming of the electrofusion sleeve is shown in Fig. 1 .

实施例2：Example 2:

若电熔套筒用于连接天然气输送管，则安全要求较高，可以采用m个检测平面分布于电熔套筒外壁上，m的最大值为N_max＝19。此处m应等于输水管检测平面数量的整数倍，其值可以结合安全需要与加工精度、加工成本选取，这里可以取为8。If the electrofusion sleeve is used to connect the natural gas pipeline, the safety requirements are higher, and m detection planes can be used to distribute on the outer wall of the electrofusion sleeve, and the maximum value of m is N _max =19. Here m should be equal to an integer multiple of the number of water pipe detection planes, and its value can be selected in combination with safety needs, processing accuracy, and processing cost, and it can be taken as 8 here.

${d d}_{cut cut} \leq \leq {R R}_{o o} ((11 - - \sqrt{11 - - {sin sin}^{22} ((\frac{π π}{N N}))})) = = 31.5 31.5 ((11 - - \sqrt{11 - - {sin sin}^{22} ((\frac{π π}{88}))})) = = 2.3978 2.3978 mm mm$

故切削深度d_cut的取值范围是0.3994≤d_cut≤2.3600，切削深度仍选为1mm；Therefore, the value range of the cutting depth d _cut is 0.3994≤d _cut ≤2.3600, and the cutting depth is still selected as 1mm;

切削宽度l_j仍为15.7480mm。The cutting width l _j is still 15.7480mm.

该电熔套筒成型示意图见图2所示。The schematic diagram of the forming of the electrofusion sleeve is shown in Figure 2.

实施例3：Example 3:

某一电熔套筒公称直径315mm，长500mm，外径为315mm，内径为251mm，厚度为32mm，配用管材壁厚为18.7mm，超声检测探头的宽度为10mm，电熔套筒的材料为PE100级聚乙烯，配用管材的材料为PE80级聚乙烯。An electrofusion sleeve has a nominal diameter of 315mm, a length of 500mm, an outer diameter of 315mm, an inner diameter of 251mm, and a thickness of 32mm. The wall thickness of the matching pipe is 18.7mm. The width of the ultrasonic detection probe is 10mm. PE100 grade polyethylene, the material of the matching pipe is PE80 grade polyethylene.

(1)检测平面长度为500mm；(1) The detection plane length is 500mm;

(2)检测平面数量：(2) Number of detection planes:

由(3)式得到：From formula (3) get:

${N N}_{max max} = = [[\frac{π π}{arcsin arcsin ((\frac{{l l}_{j j 00}}{22 {R R}_{o o}}))}]] = = [[\frac{π π}{arcsin arcsin ((\frac{1010}{22 \times \times 157.5 157.5}))}]] = = 9898$

即当检测平面宽度等于10mm时，电熔套筒外壁面最多可加工出98个检测平面。That is, when the width of the detection plane is equal to 10mm, a maximum of 98 detection planes can be processed on the outer wall of the electrofusion sleeve.

根据相对周长计算法确定DN315电熔套筒的检测平面数量：Determine the number of detection planes for DN315 electrofusion sleeves based on the relative perimeter calculation method:

若电熔套筒用于连接输水管，则安全要求较低，可令DN90电熔套筒(DN90电熔套筒N_max＝28)检测平面数量基准取为4，即x＝4。则DN315电熔套筒的检测平面数量N按下列方式确定：If the electrofusion sleeve is used to connect the water pipe, the safety requirements are relatively low, and the number of detection planes of the DN90 electrofusion sleeve (DN90 electrofusion sleeve N _max =28) can be set as 4, that is, x=4. Then the number N of detection planes of DN315 electrofusion sleeve is determined in the following way:

${N N}_{00} = = [[\frac{D D.}{9090} gx gx]] + + 11 = = [[\frac{315315}{9090} g g 44]] = = + + 11 = = 1515$

由表1可知，N₆＜N₀≤N₇，故N＝N₇，即DN315电熔套筒的检测平面数量为16；It can be seen from Table 1 that N ₆ <N ₀ ≤N ₇ , so N=N ₇ , that is, the number of detection planes of DN315 electrofusion sleeve is 16;

(3)切削深度：(3) Cutting depth:

根据切削深度的规定，Depending on the depth of cut,

$\{\begin{matrix} {d d}_{cut cut} \leq \leq {R R}_{o o} ((11 - - \sqrt{11 - - {sin sin}^{22} ((\frac{π π}{N N}))})) = = 157.5 157.5 ((11 - - \sqrt{11 - - {sin sin}^{22} ((\frac{π π}{1616}))})) = = 3.0263 3.0263 mm mm \\ {d d}_{cut cut} &GreaterEqual; &Greater Equal; {R R}_{00} - - \sqrt{{R R}_{00}^{22} - - \frac{11}{44} {l l}_{j j 00}^{22}} = = 157.5 157.5 - - \sqrt{{157.5 157.5}^{22} - - \frac{11}{44} \times \times 1010^{22}} = = 0.0794 0.0794 mm mm \\ {d d}_{cut cut} \leq \leq t t - - 0.8 0.8 {e e}_{n no} = = 3232 - - 0.8 0.8 \times \times 18.7 18.7 = = 17.0400 17.0400 mm mm . . \end{matrix}$

切削深度越小对电熔套筒力学性能影响也越小，切削宽度也越小，故切削深度d_cut的取值范围是0.0794≤d_cut≤3.0263。根据切削加工精度，可选取适宜的切削深度，d_cut可取为2mm；The smaller the cutting depth, the smaller the influence on the mechanical properties of the electrofusion sleeve, and the smaller the cutting width, so the value range of the cutting depth d _cut is 0.0794≤d _cut ≤3.0263. According to the cutting precision, the appropriate cutting depth can be selected, and the d _cut can be taken as 2mm;

(4)切削宽度：(4) Cutting width:

${l l}_{j j} = = 22 \sqrt{{R R}_{o o}^{22} - - {(({R R}_{o o} - - {d d}_{cut cut}))}^{22}} = = 22 \times \times \sqrt{{157.5 157.5}^{22} - - {((157.5 157.5 - - 22))}^{22}} = = 50.0400 50.0400 mm mm . .$

该电熔套筒的成型示意图见图3所示。The schematic diagram of forming the electrofusion sleeve is shown in FIG. 3 .

实施例4：Example 4:

若DN315管件的材料为PE80级聚乙烯，配用管材材料为PE100级聚乙烯，则切削深度应按照下式确定：If the material of DN315 pipe fittings is PE80 grade polyethylene, and the matching pipe material is PE100 grade polyethylene, the cutting depth should be determined according to the following formula:

$\{\begin{matrix} {d d}_{cut cut} \leq \leq {R R}_{o o} ((11 - - \sqrt{11 - - {sin sin}^{22} ((\frac{π π}{N N}))})) = = 157.5 157.5 ((11 - - \sqrt{11 - - {sin sin}^{22} ((\frac{π π}{1616}))})) = = 3.0263 3.0263 mm mm \\ {d d}_{cut cut} &GreaterEqual; &Greater Equal; {R R}_{00} - - \sqrt{{R R}_{00}^{22} - - \frac{11}{44} {l l}_{j j 00}^{22}} = = 157.5 157.5 - - \sqrt{{157.5 157.5}^{22} - - \frac{11}{44} \times \times 1010^{22}} = = 0.0794 0.0794 mm mm \\ {d d}_{cut cut} \leq \leq t t - - e e / / 0.8 0.8 = = 3232 - - 18.7 18.7 / / 0.8 0.8 = = 8.6250 8.6250 mm mm . . \end{matrix}$

切削深度越小对电熔套筒力学性能影响也越小，切削宽度也越小，故切削深度d_cut的取值范围是0.0794≤d_cut≤3.0263。d_cut仍可取为2mm；The smaller the cutting depth, the smaller the influence on the mechanical properties of the electrofusion sleeve, and the smaller the cutting width, so the value range of the cutting depth d _cut is 0.0794≤d _cut ≤3.0263. d _cut can still be taken as 2mm;

该DN315电熔套筒的切削宽度不变。The cutting width of the DN315 electrofusion sleeve remains unchanged.

本方法的实施方式说明只是本实用新型实施过程的具体描述，本实用新型所述的方法并不限于等径直通的套筒，其他的电熔异径、电熔弯头、电熔三通等结构都可以使用，因此采用本方法对他们进行结构改进也属于本实用新型的保护范围。The description of the implementation of this method is only a specific description of the implementation process of the utility model. The method described in the utility model is not limited to sleeves with equal diameters and straight through, other electrofusion different diameters, electrofusion elbows, electrofusion tees, etc. All structures can be used, so adopting this method to improve their structures also belongs to the protection scope of the present utility model.

本实用新型提出了在电熔套筒上设置检测平面并分别根据强度和超声检测要求确定检测平面宽度的方法，运用本方法得到的类似结构，如改变检测平面的位置或增减检测平面的数量，应属于本方法保护的范围。The utility model proposes a method of setting the detection plane on the electrofusion sleeve and determining the width of the detection plane according to the strength and ultrasonic detection requirements. The similar structure obtained by using this method, such as changing the position of the detection plane or increasing or decreasing the number of detection planes , should belong to the protection scope of this method.

Claims

1. electric smelting sleeve with detection plane comprises it is characterized in that the main body of tubulose, on the outer wall of main body, is provided with the detection plane of N strip rectangle; Detection plane has two symmetry axis, and its long symmetry axis is parallel with the central axis of electric smelting sleeve, and certain coaxial circle cylinder of detection plane and electric smelting sleeve is tangent.

2. electric smelting sleeve according to claim 1 is characterized in that, the depth of cut d of said detection plane _CutConfirm according to following manner:

In the formula, R _oBe the external diameter of electric smelting sleeve, l _J0Be the width of detect probe, t is the wall thickness of electric smelting sleeve body, e _nBe the wall thickness of the adapted tubing of electric smelting sleeve, N is a detection plane quantity.

3. electric smelting sleeve according to claim 1 is characterized in that, the quantity N of said detection plane confirms according to following mode:

If the nominal diameter of said electric smelting sleeve is D, the detection plane quantity of DN90 electric smelting sleeve as the counting foundation, is made that its detection plane is x, x is for being less than or equal to N _MaxNatural number;

As D during smaller or equal to 90mm, N ₀=x;

When D equals the integral multiple of 90mm,

When D greater than 90mm but not during its integral multiple, N is according to N ₀Size from down, choose, and

N ₀≤N ₁The time, N=N ₁

N _i＜N ₀≤N _I+1The time, N=N _I+1, i is 1,2,3,4,5,6,7;

N ₀＞N ₈The time, N=N ₈

As the counting foundation, the x value gets 1,2, and 4,6 or 8.

4. according to the electric smelting sleeve described in any one of the claim 1 to 3; It is characterized in that; The width of said detection plane is more than or equal to the width of the ultrasonic inspection probe that said electric capacity sleeve is detected, and the length of detection plane is more than or equal to the length of said ultrasonic inspection probe and be less than or equal to the axial length of electric smelting sleeve.