Rare earth aluminum alloy cable joint manufacturing method

Abstract

The invention provides a manufacturing method of a rare earth aluminum alloy cable joint, and relates to the technical field of electric power connection, and the manufacturing method comprises the following steps: S1, preparing materials and tools; s2, the cable is processed; s3, connecting wire cores, exposed outside, of the cable together by using a connecting piece; s4, an insulating sleeve is additionally arranged outside the connecting piece; s5, sealing the two ends of the insulating sleeve; s6, the sealed insulation sleeve is subjected to inspection treatment; the connecting piece comprises a connecting rod and a plurality of connecting parts, and each connecting part comprises an extrusion area, limiting teeth and a mounting groove. The limiting teeth are arranged on the connecting piece between the connecting cables, so that the contact area between the connecting piece and the wire core can be effectively increased, the friction force between the wire core and the connecting piece is further increased, the stability of connection between the connecting piece and the wire core is improved, the energy loss in the electric energy transmission process can be well controlled, and the service life of the cable is prolonged. The service life of the cable can be prolonged; and safe operation of a power system is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of power connection, and in particular to a method for manufacturing a rare earth aluminum alloy cable joint. Background Art

[0002] With the rapid development of the power industry, cables are key components for power transmission, and their connection stability and reliability are crucial. Among the many types of cables, rare earth aluminum alloy cables have gradually been widely used due to their unique performance advantages, such as good conductivity, strength and corrosion resistance.

[0003] The existing cable joint technology has many shortcomings in meeting the connection needs of rare earth aluminum alloy cables. The connecting parts of traditional cable joints have a simple structure and are often just a simple metal connecting sleeve. The connection effect is achieved by pressing the metal sleeve to deform it and generate pressure to clamp the wire core. There is a lack of targeted design for the wire core connection of rare earth aluminum alloy cables, and it is impossible to ensure close contact and stable connection between the connecting parts and the wire core. Poor contact is prone to occur, which increases the resistance of the line, resulting in increased energy loss during power transmission, and may even cause local heating, affecting the service life of the cable and the safe operation of the system. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the shortcomings of the prior art, the present invention provides a method for manufacturing a rare earth aluminum alloy cable joint, which solves the many shortcomings of the existing cable joint technology in meeting the connection needs of rare earth aluminum alloy cables. The connecting piece of the traditional cable joint has a simple structure, and is often just a simple metal connecting sleeve. The connection effect is achieved by pressing the metal sleeve to deform it and generate pressure to clamp the wire core. There is a lack of targeted design for the wire core connection of the rare earth aluminum alloy cable, and it is impossible to ensure close contact and stable connection between the connecting piece and the wire core, which is prone to poor contact, thereby increasing the resistance of the line, resulting in increased energy loss during power transmission, and may even cause local heating, affecting the service life of the cable and the safe operation of the system.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: A method for manufacturing a rare earth aluminum alloy cable joint, comprising the following steps:

[0008] S1: Prepare materials and tools, including cutting tools, hydraulic pliers, wire stripping tools and heating forming tools for cables and connecting cables;

[0009] S2: Process the cable, use a cutting tool to flatten the end of the cable, and then use a wire stripping tool to strip the end of the cable to expose the cable core;

[0010] S3: Use a connector to connect the exposed wire cores of the cable together. After the connector is put on the exposed wire core, use a hydraulic pliers to squeeze the connector;

[0011] S4: Install an insulating sleeve on the outside of the connector, install the rubber insulating sleeve on the outside of the connector and ensure that both ends of the insulating sleeve are in contact with the insulation layer of the cable;

[0012] S5: Seal the two ends of the insulating sleeve by heating the insulating sleeve with a heating molding tool so that the insulating sleeve is closely attached to the outside of the connector, and then apply sealant on both ends of the sealing sleeve so that the sealing sleeve is in close contact with the surface of the cable;

[0013] S6: Check and process the sealed insulation sleeve. After the production is completed, the cable joint is inspected for quality. First, the appearance is inspected to see whether the insulation layer of the joint is intact, whether the sealant is evenly distributed, and whether there are obvious cracks or damage;

[0014] The connector proposed based on the rare earth aluminum alloy cable joint manufacturing method is characterized in that it includes a connecting rod and a plurality of connecting parts, wherein the connecting parts are fixedly mounted on both ends of the connecting rod, and the connecting parts include an extrusion area, a limiting tooth and an installation groove.

[0015] Furthermore, the installation groove is provided on an end of the connecting portion away from the connecting rod, the limiting teeth are fixedly mounted on the inner surface of the installation groove, and the extrusion area is symmetrically arranged outside the connecting portion.

[0016] Furthermore, there are multiple limit teeth, the multiple limit teeth are in the shape of a right triangle, and the multiple limit teeth are evenly distributed on the inner surface of the installation groove.

[0017] Furthermore, in the process of connecting the cables to form a joint in S3, a hydraulic pliers is used to press the position of the extrusion area on the connector, so that the connecting portion is deformed, and the limiting teeth penetrate into the wire core to form a cable joint.

[0018] Furthermore, in S4, the prepared insulating material is wrapped around the joint connection part, the heat shrink material is put on the joint, and then a hot air blower or a heating gun is used to evenly heat the joint so that the heat shrink material shrinks tightly on the joint to form a good insulating layer.

[0019] Furthermore, in S5, silicone rubber sealant is applied to the interfaces between the two ends of the insulating sleeve and the insulating material to prevent moisture and dust from entering the interior of the joint. The sealant should be applied evenly, with a thickness of generally about 2-3 mm, and it should be ensured that the sealant completely covers the interface to form a good sealing effect.

[0020] Furthermore, in S6, it is also necessary to perform electrical performance tests on the cable joints, including insulation resistance tests and withstand voltage tests. The insulation resistance test can be performed using an insulation resistance tester, and then the insulation resistance value of the joint is measured. For a 10kV cable joint, the insulation resistance is generally required to be no less than 1000MΩ. The withstand voltage test can be performed using a withstand voltage tester at 1.5-2 times the rated voltage of the cable, and the duration is generally 1-5 minutes, to check whether the joint can work normally under high voltage without breakdown or flashover.

[0021] Furthermore, the steps for making the connecting piece are as follows:

[0022] Step 1: Prepare materials and select suitable rare earth and aluminum alloy as the main materials of the joint; rare earth elements can refine grains, improve strength and conductivity in aluminum alloys;

[0023] Step 2: Melting materials, melting the rare earth material and the aluminum alloy into molten metal, and then using a stirring device to stir the molten metal so that the rare earth material and the aluminum alloy are evenly mixed together;

[0024] Step 3: Condensing the main body, using a mold to condense the molten metal mixed with the rare earth material and the aluminum alloy into the main body of the connector;

[0025] Step 4: Deburring: trimming and grinding the condensed connector body to remove burrs;

[0026] Step 5: Weld the limiting teeth and weld the limiting teeth to the trimmed connector body according to the limiting direction.

[0027] (III) Beneficial effects

[0028] The present invention provides a method for manufacturing a rare earth aluminum alloy cable joint. It has the following beneficial effects:

[0029] In this solution, by setting limiting teeth on the connector between the connecting cables, the contact area between the connector and the wire core can be effectively increased, thereby increasing the friction between the wire core and the connector, which is beneficial to improving the stability of the connection between the connector and the wire core, and thus can well control the energy loss in the power transmission process, thereby increasing the service life of the cable and ensuring the safe operation of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1A schematic diagram of a process for manufacturing a rare earth aluminum alloy cable joint proposed by the present invention;

[0031] Figure 2 This is a schematic diagram of the external structure of the connecting piece proposed by the present invention;

[0032] Figure 3 This is a schematic diagram of the internal structure of the connecting piece proposed by the present invention.

[0033] Among them, 1. connecting rod; 2. connecting part; 21. extrusion area; 22. installation groove; 23. limiting tooth. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example:

[0036] like Figure 1-3 As shown, an embodiment of the present invention provides a method for manufacturing a rare earth aluminum alloy cable joint, comprising the following steps:

[0037] S1: Prepare materials and tools, including cutting tools, hydraulic pliers, wire stripping tools and heating forming tools for cables and connecting cables;

[0038] S2: Process the cable, use a cutting tool to flatten the end of the cable, and then use a wire stripping tool to strip the end of the cable to expose the cable core;

[0039] S3: Use a connector to connect the exposed wire cores of the cable together. After the connector is put on the exposed wire core, use a hydraulic pliers to squeeze the connector. In the process of connecting the cables to form a joint, use the hydraulic pliers to press the position of the squeezing area 21 on the connector, so that the connecting part 2 is deformed, and then the limiting teeth 22 penetrate into the wire core to form a cable joint.

[0040] S4: Install an insulating sleeve on the outside of the connector, install the rubber insulating sleeve on the outside of the connector and ensure that both ends of the insulating sleeve are in contact with the insulation layer of the cable, wrap the prepared insulating material (such as cross-linked polyethylene or ethylene-propylene rubber) on the joint connection, put the heat shrink material on the joint, and then use a hot air blower or a heating gun to evenly heat it so that the heat shrink material shrinks tightly on the joint to form a good insulation layer;

[0041] S5: Seal both ends of the insulating sleeve. Heat the insulating sleeve using a heating molding tool to make it fit tightly against the outside of the connector. Apply sealant to both ends of the sealing sleeve to make it in close contact with the surface of the cable. Apply silicone rubber sealant to the interfaces between both ends of the insulating sleeve and the insulating material to prevent moisture and dust from entering the connector. Apply the sealant evenly to a thickness of about 2-3 mm, and ensure that the sealant completely covers the interface to form a good sealing effect.

[0042] S6: Check and process the sealed insulation sleeve. After the production is completed, the cable joint is quality checked. First, the appearance is checked to see whether the insulation layer of the joint is complete, whether the sealant is uniform, and whether there are obvious cracks or damage. The electrical performance test of the cable joint is also required, including insulation resistance test and withstand voltage test. The insulation resistance test can be performed using an insulation resistance tester, and then the insulation resistance value of the joint is measured. For a 10kV cable joint, the insulation resistance is generally required to be no less than 1000MΩ. For the withstand voltage test, a withstand voltage tester can be used. The withstand voltage test is performed at 1.5-2 times the rated voltage of the cable. The duration is generally 1-5 minutes. Check whether the joint can work normally under high voltage without breakdown or flashover.

[0043] The connector proposed based on the rare earth aluminum alloy cable joint manufacturing method includes a connecting rod 1 and a plurality of connecting parts 2. The connecting parts 2 are fixedly installed on both ends of the connecting rod 1. The connecting parts 2 include an extrusion area 21, a limiting tooth 22 and a mounting groove 23.

[0044] The mounting groove 23 is opened on one end of the connecting part 2 away from the connecting rod 1, the limiting teeth 22 are fixedly installed on the inner surface of the mounting groove 23, the extrusion area 21 is symmetrically arranged on the outside of the connecting part 2, the number of the limiting teeth 22 is multiple, the multiple limiting teeth 22 are in the shape of a right triangle, the multiple limiting teeth 22 are evenly distributed on the inner surface of the mounting groove 23, and the multiple limiting teeth 22 are distributed in an array.

[0045] The steps for making the connector are as follows:

[0046] Step 1: Prepare materials and select suitable rare earth and aluminum alloy as the main materials of the joint; rare earth elements (such as lanthanum, cerium, etc.) can play a role in refining grains, improving strength and conductivity in aluminum alloys; for example, according to the current carrying capacity and mechanical strength requirements of the cable, select aluminum alloys containing appropriate amounts of rare earth elements (generally the rare earth content is around 0.1%-0.5%), which can be obtained by purchasing finished materials that meet the standards;

[0047] These rare earth materials generally exist in the form of rare earth metal blocks, rare earth master alloys (such as aluminum-rare earth master alloys), and aluminum alloy raw materials can be pure aluminum ingots (such as 1070, 1060 and other series of pure aluminum) and master alloys of other alloying elements (such as magnesium, silicon, etc.), which are used to adjust the basic properties of aluminum alloys;

[0048] Step 2: Melting materials, melting rare earth materials and aluminum alloy into molten metal, then using stirring equipment to stir the molten metal so that the rare earth materials and aluminum alloy are evenly mixed together, first putting aluminum alloy raw materials (such as aluminum ingots and alloy element master alloy) into the smelting furnace, because the melting point of aluminum alloy is relatively low (the melting point of pure aluminum is about 660°C), it can be melted first to form a molten pool, and then rare earth materials are added after the aluminum alloy begins to melt. If it is a rare earth metal block, it is best to press it into the bottom of the molten pool due to its high activity in order to reduce oxidation loss. If it is a rare earth master alloy, it can be added to the surface of the molten pool after a part of the aluminum alloy is melted, and it can be evenly melted by stirring or other methods;

[0049] The smelting temperature is generally controlled at around 700-800℃. If the temperature is too high, it will lead to excessive oxidation of the molten metal and increase the burning rate. It will also increase the volatilization loss of rare earth elements. For example, lanthanum is easy to volatilize at high temperatures. If the temperature exceeds 850℃, the volatilization rate of lanthanum will be significantly accelerated. During the smelting process, temperature measurement equipment such as thermocouples should be used to accurately control the temperature.

[0050] In order to fully fuse the rare earth material and the aluminum alloy, stirring is required. A mechanical stirring rod (such as a graphite stirring rod) or electromagnetic stirring can be used. When mechanical stirring is performed, the stirring speed is generally controlled at about 100-200r / min, and the stirring time is about 10-20min to ensure that the rare earth elements are evenly distributed in the aluminum alloy melt. Electromagnetic stirring is achieved by setting an electromagnetic coil at the bottom or side of the furnace to generate an alternating magnetic field to cause the metal liquid to circulate, thereby achieving a stirring effect;

[0051] After smelting, refining treatment is required. First, degassing operation is performed. The rare earth aluminum alloy melt after fusion may contain gas (such as hydrogen) and needs to be degassed. The commonly used method is to use hexachloroethane (C 2 Cl 5 ) or nitrogen for degassing. When hexachloroethane is used, it is pressed into the bottom of the melt to produce chlorine and aluminum chloride (AlCl 3 ) Bubbles will absorb hydrogen in the melt and be discharged as the bubbles float up. Nitrogen degassing is done by introducing high-purity nitrogen (purity above 99.99%) into the melt. The bubbles formed by nitrogen can also carry away hydrogen.

[0052] Then, the inclusions are removed. The possible inclusions in the melt (such as oxides, carbides, etc.) will affect the quality of the alloy. They can be removed by filtering, such as using a ceramic foam filter. The ceramic foam filter has a three-dimensional mesh structure, which can effectively block the inclusions in the melt and make the melt purer. During filtering, the melt passes through the filter at a certain flow rate (generally about 1-2 kg / s) into the casting or the next process;

[0053] Step 3: Condensing the main body, using a mold to condense the mixed metal liquid of the rare earth material and the aluminum alloy into the main body of the connector, preparing a suitable mold according to the required product shape (such as the blank shape of the cable connector) when pouring the mixed metal liquid of the rare earth material and the aluminum alloy, and preheating the mold at a temperature of about 200-300°C to prevent defects caused by rapid cooling of the alloy liquid during the casting process, and also applying a release agent (such as zinc oxide, graphite powder, etc.) on the mold surface to facilitate demolding of the casting after molding;

[0054] During the pouring process, the refined rare earth aluminum alloy melt is poured into the mold at an appropriate speed (depending on the size and shape of the casting, generally the casting speed is about 0.5-1.5kg / s). During the casting process, attention should be paid to avoid splashing and eddy currents of the melt, and to prevent the inclusion of gas and inclusions. After the casting is completed, the casting is allowed to cool naturally in the mold, and demolded after cooling to a certain temperature (generally below 200°C) to obtain a rare earth aluminum alloy blank;

[0055] Step 4: Deburring. The condensed connector body is trimmed and polished to remove burrs. First, impurities on the surface of the rare earth aluminum alloy blank need to be removed. After casting or other forming processes, the cable connector blank often has some impurities attached to its surface, such as sand (if sand casting is used), oxide scale, etc. You can use wire brushes, sandpaper and other tools to polish and clean the surface of the blank to remove these visible impurities. For some stubborn oxide scales, chemical pickling methods can also be used, such as using a dilute hydrochloric acid solution (the concentration is generally controlled at about 5%-15%) to soak the blank for a certain period of time (usually a few minutes to more than ten minutes, which needs to be adjusted according to actual conditions) to make the oxide scale react with the acid and dissolve and fall off, and then rinse thoroughly with clean water to remove the residual acid to prevent it from causing corrosion and other adverse effects on the subsequent processing of the blank;

[0056] Then, use flaw detection methods (such as ultrasonic flaw detection, X-ray flaw detection, etc.) to check whether there are defects such as pores and shrinkage cavities inside the blank. If such defects are found and the degree of defects exceeds the allowable range, for smaller and shallower pores, they can be repaired by repair welding. Select welding wire that matches the composition of rare earth aluminum alloy, use argon arc welding and other welding methods to fill and polish the pores to ensure that the welding quality meets the subsequent use requirements. For more serious and larger defects, it may be necessary to recast the blank to ensure the quality and reliable performance of the cable connector;

[0057] Then the surface of the connector needs to be processed. Polishing and grinding can further improve the surface quality. Use coarse sandpaper (such as 120-240 mesh) for preliminary grinding to remove processing marks, and then use finer sandpaper (such as 320 mesh, 600 mesh, 1000 mesh, etc.) for fine grinding to make the surface smoother and flatter. For some parts with higher appearance requirements or better contact performance, polishing wheels and polishing paste can be used for polishing to achieve a mirror effect on the surface, reduce surface resistance and improve the electrical performance of the connector.

[0058] Then, the surface of the connector is treated for corrosion. If the cable connector will be used outdoors, in a humid environment or in an environment with corrosive gases, a suitable anti-corrosion paint can be applied on its surface. For example, epoxy zinc-rich primer can be used. The zinc powder contained in it can play a cathodic protection role and prevent the aluminum alloy surface from rusting. Then, a layer of acrylic polyurethane topcoat is applied to improve the weather resistance and decorative properties of the coating. During the coating, the paint layer must be uniform and the thickness must meet the requirements (generally, the primer thickness is about 60-80μm, and the topcoat thickness is about 40-60μm). In addition, the paint must be dried and cured according to the specified drying time and process conditions (such as temperature, humidity, etc.);

[0059] Finally, for some situations with high requirements for corrosion resistance and surface hardness, the rare earth aluminum alloy cable connector can be anodized. The connector is placed as an anode in a specific electrolyte (such as sulfuric acid solution, the concentration is generally around 15%-20%), and a dense oxide film is formed on its surface through electrolysis. The oxide film not only has good corrosion resistance, but also can improve the surface hardness and enhance wear resistance. The thickness of the oxide film can be controlled at about 5-20μm according to actual needs. After treatment, it is necessary to perform sealing treatment (such as sealing with hot water or nickel salt solution) to further improve the stability and protective effect of the oxide film.

[0060] Step 5: Weld the limiting component. Weld the limiting component (such as the limiting tooth 22) to the trimmed connecting part body according to the limiting direction. When welding the limiting tooth 23, weld and fix the inclined surface in the direction of the outlet of the mounting groove 23. The material of the limiting tooth 23 is the same as that of the connecting rod 1 and the connecting part 21.

[0061] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for manufacturing a rare earth aluminum alloy cable joint, characterized in that: The following steps are involved: S1: Prepare materials and tools, including cutting tools, hydraulic pliers, wire stripping tools and heating forming tools for cables and connecting cables; S2: Process the cable, use a cutting tool to flatten the end of the cable, and then use a wire stripping tool to strip the end of the cable to expose the cable core; S3: Use a connector to connect the exposed wire cores of the cable together. After the connector is put on the exposed wire core, use a hydraulic pliers to squeeze the connector; S4: Install an insulating sleeve on the outside of the connector, install the rubber insulating sleeve on the outside of the connector and ensure that both ends of the insulating sleeve are in contact with the insulation layer of the cable; S5: Seal the two ends of the insulating sleeve by heating the insulating sleeve with a heating molding tool so that the insulating sleeve is closely attached to the outside of the connector, and then apply sealant on both ends of the sealing sleeve so that the sealing sleeve is in close contact with the surface of the cable; S6: Check and process the sealed insulation sleeve. After the production is completed, the cable joint is inspected for quality. First, the appearance is inspected to see whether the insulation layer of the joint is intact, whether the sealant is evenly distributed, and whether there are obvious cracks or damage; A connector proposed based on a method for manufacturing a rare earth aluminum alloy cable joint is characterized in that it includes a connecting rod (1) and a plurality of connecting parts (2), wherein the connecting parts (2) are fixedly mounted on both ends of the connecting rod (1), and the connecting parts (2) include an extrusion area (21), a limiting tooth (22) and a mounting groove (23).

2. The connector proposed based on the method for manufacturing a rare earth aluminum alloy cable joint according to claim 1 is characterized in that: The installation groove (23) is formed on an end of the connecting portion (2) away from the connecting rod (1), the limiting teeth (22) are fixedly mounted on the inner surface of the installation groove (23), and the extrusion area (21) is symmetrically arranged outside the connecting portion (2).

3. The connector proposed based on the method for manufacturing a rare earth aluminum alloy cable joint according to claim 1 is characterized in that: The number of the limiting teeth (22) is multiple, the multiple limiting teeth (22) are in the form of a right triangle, and the multiple limiting teeth (22) are evenly distributed on the inner surface of the installation groove (23).

4. The method for manufacturing a rare earth aluminum alloy cable joint according to claim 1, characterized in that: In the above S3, during the process of connecting the cables to form a joint, hydraulic pliers are used to press the position of the extrusion area (21) on the connecting piece, so that the connecting part (2) is deformed, thereby causing the limiting teeth (22) to penetrate into the wire core to form a cable joint.

5. The method for manufacturing a rare earth aluminum alloy cable joint according to claim 1, characterized in that: In S4, the prepared insulating material (such as cross-linked polyethylene or ethylene-propylene rubber) is wrapped around the joint connection part, the heat shrink material is sleeved on the joint, and then a hot air blower or a heating gun is used to evenly heat the heat shrink material so that the heat shrink material shrinks tightly on the joint to form a good insulating layer.

6. The method for manufacturing a rare earth aluminum alloy cable joint according to claim 1, characterized in that: In the S5, silicone rubber sealant is applied to the interfaces between the two ends of the insulating sleeve and the insulating material to prevent moisture and dust from entering the interior of the joint. The sealant should be applied evenly, with a thickness of generally about 2-3 mm, and it should be ensured that the sealant completely covers the interface to form a good sealing effect.

7. The method for manufacturing a rare earth aluminum alloy cable joint according to claim 1, characterized in that: In the S6, the electrical performance test of the cable joints is also required, including insulation resistance test and withstand voltage test. The insulation resistance test can be performed using an insulation resistance tester, and then the insulation resistance value of the joint is measured. For a 10kV cable joint, the insulation resistance is generally required to be no less than 1000MΩ. The withstand voltage test can be performed using a withstand voltage tester at 1.5-2 times the rated voltage of the cable, and the duration is generally 1-5 minutes. Check whether the joint can work normally under high voltage without breakdown or flashover.

8. The connector proposed based on the method for manufacturing a rare earth aluminum alloy cable joint according to claim 1 is characterized in that: The steps for making the connecting piece are as follows: Step 1: Prepare materials and select suitable rare earth and aluminum alloy as the main materials of the joint; rare earth elements (such as lanthanum, cerium, etc.) can refine grains, improve strength and conductivity in aluminum alloys; Step 2: Melting materials, melting the rare earth material and the aluminum alloy into molten metal, and then using a stirring device to stir the molten metal so that the rare earth material and the aluminum alloy are evenly mixed together; Step 3: Condensing the main body, using a mold to condense the molten metal mixed with the rare earth material and the aluminum alloy into the main body of the connector; Step 4: Deburring: trimming and grinding the condensed connector body to remove burrs; Step 5: Weld the limiting teeth and weld the limiting teeth to the trimmed connector body according to the limiting direction.

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