WO2017107892A1 - 一种接触组件及其高压直流继电器 - Google Patents

一种接触组件及其高压直流继电器 Download PDF

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Publication number
WO2017107892A1
WO2017107892A1 PCT/CN2016/110953 CN2016110953W WO2017107892A1 WO 2017107892 A1 WO2017107892 A1 WO 2017107892A1 CN 2016110953 W CN2016110953 W CN 2016110953W WO 2017107892 A1 WO2017107892 A1 WO 2017107892A1
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WIPO (PCT)
Prior art keywords
spring
moving
moving spring
push rod
contact
Prior art date
Application number
PCT/CN2016/110953
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English (en)
French (fr)
Inventor
施生圣
钟叔明
Original Assignee
厦门宏发电力电器有限公司
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Filing date
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Application filed by 厦门宏发电力电器有限公司 filed Critical 厦门宏发电力电器有限公司
Publication of WO2017107892A1 publication Critical patent/WO2017107892A1/zh

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements
    • H01H50/56—Contact spring sets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements
    • H01H50/56—Contact spring sets
    • H01H50/58—Driving arrangements structurally associated therewith; Mounting of driving arrangements on armature

Definitions

  • the present invention relates to a DC relay, and more particularly to a contact assembly for a high voltage DC relay and a high voltage DC relay thereof.
  • a relay is an electronic control device that has a control system (also called an input loop) and a controlled system (also called an output loop). It is usually used in an automatic control circuit. It actually uses a small current to control the larger An “automatic switch” of current. Therefore, it plays the role of automatic adjustment, safety protection and conversion circuit in the circuit.
  • the DC relay is one of the relays.
  • Most of the existing DC relays adopt a moving reed direct-acting type (also called a solenoid direct-acting type) scheme, such as the contact part of the DC relay disclosed in Chinese Patent No. CN102243939A.
  • the utility model comprises two static contacts and a moving component, the moving component comprises a moving spring part and a pushing rod assembly, and the moving spring part comprises moving parts of the moving spring and the moving spring (the moving contact can also be directly moved by the moving spring)
  • the two ends are formed.
  • the moving spring is a straight piece. When the moving contacts at both ends of the moving spring are respectively in contact with the two stationary contacts, the current flows from one of the static contacts, after passing the moving spring.
  • the moving spring portion is mounted at one end of the push rod assembly, and the other end of the push rod assembly is coupled to the moving iron core, and when the coil is connected to the current to move the moving iron core upward, The iron core drives the push rod assembly to move upward, so that the movable contact at both ends of the movable spring is in contact with the two static contacts respectively.
  • the moving iron core is moved downward by the action of the return spring, and the moving iron core Pushing the push rod assembly down , So that the movable ends of the movable contact spring with two stationary contacts are separated.
  • the existing high-voltage DC relays are prone to cause sticking or burning of the moving and static contacts due to arcing when a large current is turned on, and at the same time, after the moving and static contacts are closed, it is easy to bond when flowing through a large current.
  • the object of the present invention is to overcome the deficiencies of the prior art and provide a contact assembly and a high-voltage DC relay thereof.
  • the bonding at the time of turning on can be effectively avoided, and the anti-adhesive ability can be improved.
  • the anti-stickiness when flowing through a large current is effectively improved after the dynamic and static contacts are closed.
  • a contact assembly comprising a moving spring portion and a matching static spring portion, the moving spring portion including a moving spring and a movable contact at both ends of the moving spring, the two moving contacts and the matching static spring portion respectively Corresponding to the static contact, in the moving spring, the middle portion corresponding to the moving spring between the two moving contacts is set to be upwardly convex. Shape structure.
  • the inverted U-shaped structure of the movable spring is formed by bending the movable spring in the thickness direction.
  • the moving spring is formed in a single piece structure or stacked by a plurality of pieces of a single piece structure.
  • the static spring of the matched static spring portion is a static reed
  • the static contact is fixed on the static reed and the flow direction of the current on the static reed and the inverted U of the moving reed
  • the current flow direction of the two arms of the structure is perpendicular, and the arms of the inverted U-shaped structure of the moving spring are respectively subjected to outward forces in opposite directions, so that the inverted spring of the moving spring The two arms of the structure move outward, thereby causing the movable contact to swing outward.
  • the static spring of the matched static spring portion is a lead end, and the static contact is fixed on the lead end and the flow direction of the current on the lead end and the inverted U of the moving reed
  • the current flow directions of the two arms of the structure are parallel; when the distance between the arms of the inverted U-shaped structure of the moving spring is smaller than the distance between the leading end and the corresponding arm of the moving spring, the inverted U of the moving spring
  • the two arms of the shape structure are respectively subjected to the outward force in the opposite direction, so that the two arms of the inverted U-shaped structure of the moving spring are moved outward, thereby driving the movable contact to move outward; when the moving spring is inverted U
  • the arms of the inverted U-shaped structure of the moving spring are respectively subjected to the opposite inward force, so that the moving spring Piece of inverted U
  • the two arms of the two arms of the shaped structure is greater than the distance between the leading end and the corresponding arm of the moving spring, the arms of the inverted
  • the invention also provides a high voltage direct current relay comprising two static contacts composed of a static spring portion and a moving assembly; the moving assembly comprising a moving spring portion as described above, and two spring and push rod assemblies;
  • the moving spring is mounted in the push rod assembly by two springs, and the two springs are respectively tensioned between the moving spring and the push rod assembly and the moving spring is pressed against the inside of the top of the push rod assembly.
  • the push rod assembly is composed of two separate parts of a push rod portion and a U-shaped basket, the bottom of the U-shaped basket is fixed on the push rod portion and the moving spring is accommodated in the U
  • the pusher portion includes a fixing piece and a push rod fixed together by an insulating plastic; the push rod portion further includes a spring support portion extending from both sides of the insulating plastic, the bottom end of the spring abutting against the spring On the support.
  • the spring support portion is further integrally extended with a first boss for positioning a spring, and a bottom end of the spring is sleeved on the first boss.
  • the two springs are conical structures.
  • the top side of the moving spring on the top of the push rod assembly is the inner side of the top of the U-shaped basket above the moving spring on the moving spring, and the top of the U-shaped basket is provided.
  • the inverted U that can make the protrusion
  • the inner side of the top of the U-shaped basket is provided with a first tenon, and the first tenon is disposed on one side corresponding to the width of the moving reed, so that when the contact is broken,
  • the inner first tenon of the top of the U-shaped basket acts as a topping of the moving spring, and the moving spring is inclined toward one side of the width.
  • the first tenon is formed by bending at a corresponding position on the top of the U-shaped basket or formed by punching.
  • the inner side of the top of the U-shaped basket is further provided with a second tenon, and the second tenon is disposed on the other side corresponding to the width of the moving spring, and the second tenon
  • the height dimension is set to have a height difference from the height dimension of the first tenon such that when the contact is broken, the inner side of the top of the U-shaped basket is urged against the moving reed, and the moving reed is oriented to the width. Tilt one side.
  • the bottoms of the two sides of the U-shaped basket are provided with a card hole, and two ends of the fixing piece are respectively fitted in the hole of the two sides of the U-shaped basket, and pass through
  • the riveting method or the laser welding method fixes both ends of the fixing piece to the hole holes of the both sides of the U-shaped basket.
  • this structure is advantageous for heat dissipation, and at the same time, the rigidity can be effectively reduced, and the deformation is facilitated, and the convex portion in the middle of the movable reed is matched.
  • Invert U In the case of the shape structure, the movable contact can be well moved to "sway" inward or “sway” to the outside, thereby avoiding the contact bonding at a large current.
  • the first tenon is provided on the inner side of the top of the U-shaped basket, the first tenon is disposed on one side corresponding to the width of the movable reed so that when the contact is broken, the top of the U-shaped basket is received.
  • the inner first tenon and the movable reed act to tighten, and the moving spring is inclined toward one side of the width.
  • the moving spring when the contact is broken, the moving spring is inclined under the tension of the spring, so that the arcing point is separated from the contact point, and the contact resistance is small; when the contact is closed, the driven spring portion is closed. Starting to tilt to the horizontal level of the moving spring (ie, the reliable contact of the final moving and static contact), so that the contact point of the moving and static contact "rolls" during the contact process, effectively avoiding the bonding and improving the anti-adhesion ability.
  • the structure of the present invention can reduce the operating voltage of the product under the condition of ensuring the contact pressure; or the contact pressure of the product can be ensured under the action voltage It is large to ensure reliable contact with the product and is good for resisting large fault currents.
  • the U-shaped basket and the push rod portion are designed as two separate parts, the U-shaped basket is made of a metal material (non-magnetic material is preferable), and the push rod portion is made of a fixing piece made of a push rod and a metal material.
  • a metal material non-magnetic material is preferable
  • the push rod portion is made of a fixing piece made of a push rod and a metal material.
  • FIG. 1 is a schematic structural view of a moving spring portion of the first embodiment of the present invention
  • Figure 2 is a schematic view showing the structure of the moving spring portion (overturning an angle) of the first embodiment of the present invention
  • FIG. 3 is a schematic structural view of a high voltage direct current relay according to the first embodiment of the present invention.
  • FIG. 4 is a schematic view showing the cooperation of the push rod portion, the double spring and the moving spring of the high voltage direct current relay of the present invention
  • FIG. 5 is a schematic structural view of a contact separation state of a high voltage direct current relay according to a first embodiment of the present invention
  • FIG. 6 is a schematic structural view showing a state in which a contact of a high voltage direct current relay according to the present invention is closed;
  • Figure 7 is a side elevational view showing the state in which the contacts of the high voltage direct current relay of the present invention are separated;
  • Figure 8 is a side elevational view of the contact separation state (not shown) of the high voltage direct current relay of the first embodiment of the present invention
  • FIG. 9 is a schematic structural view of a spring of a high voltage direct current relay according to a first embodiment of the present invention.
  • Figure 10 is a perspective view showing the configuration of a U-shaped basket of the high voltage direct current relay of the present invention.
  • Figure 11 is a side view of a U-shaped basket of the high voltage direct current relay of the present invention.
  • Figure 12 is a perspective view showing the structure of the push rod portion of the high voltage direct current relay of the present invention.
  • Figure 13 is a schematic view showing a direction of force of the two arms of the inverted U-shaped structure of the moving spring of the high voltage direct current relay of the first embodiment
  • Figure 14 is a schematic view showing another force direction of the arms of the inverted U-shaped structure of the moving spring of the high voltage direct current relay of the first embodiment
  • Figure 15 is a schematic view showing the force and displacement characteristic curves of a conical spring and a cylindrical spring used in the high voltage direct current relay of the present invention
  • Figure 16 is a schematic view showing the force receiving directions of the two arms of the inverted U-shaped structure of the moving spring of the high voltage direct current relay of the second embodiment
  • FIG. 17 is a perspective view showing a three-dimensional structure of a U-shaped basket of a high voltage direct current relay according to a third embodiment of the present invention.
  • Figure 18 is a side view of a U-shaped basket of the high voltage direct current relay of the third embodiment of the present invention.
  • the contact assembly in a contact assembly of the present invention, includes a moving spring portion and a matching static spring portion, the moving spring portion 1 including a moving spring 11 and two movable contacts 12,
  • the two movable contacts 12 are respectively fixed on the upper ends of the moving springs 11 to be adapted to the corresponding static contacts, and are provided with upward convexity in the middle of the moving springs 11 between the positions of the fixed moving contacts.
  • Stretched U Shape structure 13 Of course, it is also possible to directly use both ends of the movable reed 11 as a movable contact.
  • the inverted U-shaped structure 13 of the moving spring is formed by bending the moving spring 11 in the thickness direction.
  • the moving spring piece 11 is constructed by laminating a plurality of pieces of a single piece structure together.
  • a high-voltage DC relay of the present invention includes two static contacts 21, 22, a moving assembly, and a movable iron core 31, a yoke 32, a coil 33 and the like.
  • the moving assembly includes the above-mentioned moving spring portion 1 and two springs 4 and a push rod assembly 5; the two movable contacts 12 are respectively fixed at two ends of the moving spring 11 and the two static contacts 21, The static contacts of 22 correspond to each other; the moving springs 11 are mounted in the push rod assembly 5 by two springs 4, and the two springs 4 are respectively tensioned between the moving springs 11 and the push rod assembly 5, and are moved The reed 11 abuts against the inside of the top of the push rod assembly 5.
  • the pusher bar assembly 5 is composed of two independent parts of a pusher bar portion 51 and a U-shaped basket 52 of metallic material, and the U-shaped basket 52 has an inverted U-shaped shape with an opening downward, and is composed of a top portion 521 and two side portions 522.
  • the bottom of the U-shaped basket 52 is fixed to the push rod portion 51 and accommodates the moving spring 11 in the U-shaped basket 52, and the push rod portion 51 includes a fixing piece 511 fixed together with an insulating plastic 513 and The push rod 512; the push rod portion 51 further includes a spring support portion 514 extending from the insulating plastic 513 to both sides, the bottom end of the spring 4 abutting against the spring support portion 514.
  • the other end of the push rod 512 is connected to the movable iron core 31.
  • the movable contact 12 at both ends of the movable spring 11 is in contact with the static contacts of the two static contacts 21, 22, the current is touched by one of the static contacts.
  • the head flows in and flows out from the other static contact after moving the reed; when the coil 33 is connected to the current to move the moving iron core 31 upward, the moving iron core 31 drives the push rod assembly to move upward, so that the ends of the moving spring 11 are
  • the movable contact 12 is in contact with the static contacts of the two static contacts 21, 22 respectively.
  • the movable iron core 31 is moved downward by the action of the return spring, and the movable iron core 31 drives the push rod.
  • the assembly is moved downward to separate the movable contact 12 at both ends of the movable reed 11 from the two stationary contacts 21, 22.
  • the spring support portion 514 is further integrally extended with a first boss 515 for positioning a spring, and a bottom end of the spring 4 is sleeved on the first boss 515. The top end of the spring 4 is fitted over the riveted end of the movable contact 32.
  • the two springs 4 have a conical structure, and of course, may be a cylindrical spring.
  • the top surface of the moving spring piece 11 abutting against the top of the push rod assembly is the inner side of the top portion 521 of the U-shaped basket on the moving spring piece 11 against the push rod assembly.
  • the top portion 521 of the U-shaped basket 52 is provided with a convex portion. Stretched U
  • the retaining hole 523 is formed by the shape structure 13 .
  • the inner side of the top portion 521 of the U-shaped basket 52 is provided with a first tenon 524 disposed on one side corresponding to the width of the moving spring piece 11, so that when the contact is broken, the U-shaped basket is received.
  • the inner first tenon 524 of the top portion 521 acts as a top end of the moving spring piece 11, and the moving spring piece 11 is inclined toward one side of the width (as shown in Fig. 8).
  • the first tenon 524 is formed by bending the corresponding position of the top of the U-shaped basket or is formed by punching with a mold.
  • the bottom of the two sides of the U-shaped basket 522 is provided with a hole 525.
  • the two ends of the fixing piece 511 are respectively fitted in the hole 525 of the two sides of the U-shaped basket 52, and are riveted or
  • the laser welding method is such that both ends of the fixing piece 511 are fixed to the card holes 525 of the both side portions 522, respectively.
  • the push rod 512 drives the U-shaped basket 52 and the movable spring 11 to move upward, so that the two movable contacts 12 of the moving spring portion and the two static touches respectively
  • the static contacts of the heads 21, 22 are in contact, and before the movable iron core 31 is moved into position, the push rod 512 drives the U-shaped basket 52 to continue upward movement, and the moving spring portion 1 compresses the two springs 4 under the blocking of the static contacts.
  • a gap is formed between the top 521 of the U-shaped basket and the moving spring piece 11, and the moving spring is horizontal.
  • the movable iron core 31 moves downward, and the push rod 512 drives the U-shaped basket 52 to move downward.
  • the two springs 4 are stretched to move the spring reed 11 In contact with the top 521 of the U-shaped basket, the moving spring is deflected such that the two moving contacts 12 of the moving spring portion are separated from the stationary contacts of the two stationary contacts 21, 22, respectively.
  • the current flow directions of the two arms 131 of the structure 13 are parallel; when the fault current is generated (for example, 4KA/6KA), the "ample force law" can be used to know that when the moving spring is inverted U
  • the distance L2 between the two arms of the shaped structure is smaller than the distance between the leading end and the corresponding arm of the moving reed, the inverted U of the moving spring
  • the two arms 131 of the shaped structure will respectively receive outward forces in opposite directions (F11, F12 as shown in Fig.
  • the present invention can realize the inverted U of the moving reed by adjusting the relationship between the opening distance L2 of the inverted U-shaped moving spring and the opening end L1 of the moving reed.
  • the two arms 131 of the shape structure drive the movable contact 12 to swing outward or to the inside.
  • the U-shaped moving spring opening distance L2 is smaller than the leading end and the moving spring opening distance L1
  • the moving springs are biased toward each other.
  • the contact is “pulsed” outwards
  • the U-shaped moving reed opening distance L2 is greater than the leading end and the moving reed opening distance L1
  • the two arms of the moving reed are forced inward, thereby driving the contact to "sway" inward.
  • the high-voltage DC relay of the invention adopts a plurality of single-piece structures stacked together to form a moving spring piece 11.
  • This structure is advantageous for heat dissipation, and can also effectively reduce rigidity and facilitate deformation, in conjunction with moving springs In the middle of the convex inverted U
  • the movable contact can be well moved to "sway" inward or “sway” to the outside, thereby avoiding the contact being bonded at a large current.
  • a high voltage DC relay of the present invention is provided with a first tenon 524 on the inner side of the top 521 of the U-shaped basket 52, the first tenon 524 being disposed on one side corresponding to the width of the moving reed 11, so that when the contact When disconnected, the inner first tenon 524 of the top portion 521 of the U-shaped basket 52 is urged against the movable spring piece 11, and the movable spring piece 11 is inclined toward one side of the width.
  • the moving spring piece 11 is inclined under the tension of the spring 4, thereby separating the arcing point from the contact point, ensuring a small contact resistance; when the contact is closed, the follower is driven.
  • the spring portion begins to tilt to the level of the moving spring (ie, the reliable contact of the final moving and static contact), so that the contact point of the moving and static contact "rolls" during the contact process, effectively avoiding the bonding and improving the anti-adhesion ability.
  • a high-voltage DC relay of the present invention designs two springs 4 into a conical structure.
  • the structure of the present invention can reduce the operating voltage of the product under the condition of ensuring contact pressure; or under the condition of ensuring the operating voltage,
  • the contact pressure of the product can be made large to ensure reliable contact of the product and to resist large fault currents.
  • a double conical spring 21 solution is adopted.
  • the conical spring is also called a conical spiral compression spring or a pagoda spring.
  • M1 in the figure is a force and displacement characteristic curve of the conical spring
  • M2 is a cylindrical spring.
  • the force and displacement characteristic curve, M2 is actually a straight line.
  • the conical spring is characterized in that the stiffness is nonlinear, that is, the force rises slowly under the displacement of the front section, and the force rises sharply as the compression amount increases in the latter stage. This is consistent with the stiffness of the cylindrical spring and the characteristic is that the straight line is very different. In the front section of the displacement, the force F2 of the cylindrical spring is greater than the force F1 of the conical spring.
  • the DC product of the present invention is a "spiral tube" monostable structure, the operating voltage of the product and the contact pressure of the product (such as F3 in Fig. 15) and the initial tension (as in Fig. 15: conical spring F1, cylindrical spring) F2) is directly related.
  • the larger the initial tension the larger the operating voltage.
  • the contact pressure of the product can be made larger under the condition of the guaranteed operating voltage.
  • a high-voltage DC relay of the present invention designs the U-shaped basket 52 and the push rod portion 51 into two separate parts, the U-shaped basket 52 is made of a metal material (non-magnetic material is preferred), and the push rod portion 51 is made of a push rod.
  • the fixing piece 511 made of 512 and the metal material is integrally injection-molded, and the dimensional accuracy of the pushing rod portion 51 is easily ensured due to the simple structure of the parts involved in the injection molding, which greatly reduces the difficulty of injection molding.
  • a high voltage DC relay of the present invention is different from the first embodiment in that the stationary spring portion of the matched static spring portion (ie, the static contact) is a static spring, and the static contact is fixed.
  • the stationary spring portion of the matched static spring portion ie, the static contact
  • the static contact is fixed.
  • the current flowing direction of the two arms 131 of the structure is perpendicular, and the arms 131 of the inverted U-shaped structure of the moving spring are respectively subjected to outward forces in opposite directions (F31, F32 as shown in Fig. 16), so that the moving spring Piece of inverted U
  • the two arms 131 of the configuration move outward, thereby causing the movable contact 12 to swing outward.
  • a high voltage DC relay of the present invention is different from the first embodiment in that a second protrusion 526 is further disposed on the inner side of the top portion 521 of the U-shaped basket 52.
  • the second protrusion 526 is disposed on the other side corresponding to the width of the movable spring piece 11, and the height of the second protrusion 526 is set to have a height difference from the height dimension of the first protrusion 524.
  • the second protrusion The height dimension of the crucible 526 is larger than the height dimension of the first tenon 524, so that when the contact is broken, the inner side of the top portion 521 of the U-shaped basket 52 is urged against the moving spring piece 11, and the moving spring piece 11 is oriented. The other side of the width is tilted.
  • two tenons are provided, and when the contact is broken by the height difference between the two tenons, the movable spring is inclined toward the corresponding side of the width.
  • the second tenon 526 is formed by bending the corresponding position of the U-shaped basket top 521 or is formed by punching with a mold.
  • the invention is provided with an inverted U-shaped structure protruding upward in the middle of the moving spring between the positions of the fixed two movable contacts, and the inverted U of the moving spring
  • the shape structure may be formed by bending the moving spring piece in the thickness direction, and the two movable contacts may be separate parts and fixed on both ends of the moving spring piece, or may directly use the two ends of the moving spring piece.
  • the moving spring is mounted in the push rod assembly by two springs, the two springs urge the moving spring against the inside of the top of the push rod assembly; the push rod assembly is made of the push rod portion and the U-shaped metal material
  • the basket consists of two separate parts,
  • the U-shaped basket has an inverted U shape with an open downward.
  • the bottom of the U-shaped basket is fixed on the push rod portion and accommodates the moving spring in the U-shaped basket.
  • the push rod portion includes a fixing piece and a push rod fixed together by an insulating plastic; the push rod portion further includes an insulating plastic a spring support extending on both sides, the bottom end of the spring abutting on the spring support portion; the structure of the present invention is industrially easy to implement, and the movable spring, the push rod portion, the U-shaped basket of metal material, and the corresponding phase fit Components such as static contacts, moving iron cores, yokes and coils are also industrially easy to process.

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Abstract

一种接触组件及其高压直流继电器，高压直流继电器包括两个静触头(21,22)和一个动组件；该动组件包括动簧部分(1)、两个弹簧(4)和推动杆组件(5)；两个动触点(12)分别设在或固定在动簧片(11)的两端并与两个静触头(21,22)的静触点相对应；该动簧片(11)通过两个弹簧(4)装于推动杆组件(5)中，两个弹簧(4)分别张紧在动簧片(11)与推动杆组件(5)之间，并使动簧片(11)上面抵向推动杆组件(5)的顶部内侧，在动簧片(11)中，在两个动触点(21,22)位置之间的动簧片(11)的中间设有向上凸伸的倒U形结构。该接触组件及其高压直流继电器通过对动簧部分(1)以及配合部件的结构改进，能够有效避免接通时粘接，提升抗粘接能力，同时有效提升动静触头闭合后，流经大电流时的抗粘性。

Description

一种接触组件及其高压直流继电器 技术领域
本发明涉及一种直流继电器，特别是涉及一种用于高压直流继电器的接触组件及其高压直流继电器。
背景技术
继电器是一种电子控制器件，它具有控制系统（又称输入回路）和被控制系统（又称输出回路），通常应用于自动控制电路中，它实际上是用较小的电流去控制较大电流的一种“自动开关”。故在电路中起着自动调节、安全保护、转换电路等作用。
直流继电器是继电器中的一种，现有的直流继电器大多采用动簧片直动式（也称为螺线管直动式）方案，比如中国专利CN102243939A所披露的，该直流继电器的触头部分包括两个静触头和一个动组件，动组件包括动簧部分和推动杆组件，动簧部分包括动簧片和动簧片两端的动触点（动触点也可以是直接由动簧片的两端部来构成），动簧片为直片式，当动簧片两端的动触点分别与两个静触头相接触时，电流由其中一个静触头流入，经过动簧片后从另一个静触头流出；该动簧部分是装在推动杆组件的一端，推动杆组件的另一端则与动铁芯相连接，当线圈接入电流而使动铁芯向上运动时，动铁芯带动推动杆组件向上移动，使动簧片两端的动触点与两个静触头分别相接触，当线圈断开电流时，动铁芯受复位弹簧的作用向下运动，动铁芯则带动推动杆组件向下移动，使动簧片两端的动触点与两个静触头分别相分离。现有的高压直流继电器在接通大电流时由于产生电弧，易造成动、静触点发生粘连或烧损的弊端，同时在动静触头闭合后，流经大电流时容易粘接。
发明内容
本发明的目的在于克服现有技术之不足，提供一种接触组件及其高压直流继电器，通过对动簧部分以及配合部件的结构改进，能够有效避免接通时粘接，提升抗粘接能力，同时有效提升动静触头闭合后，流经大电流时的抗粘性。
本发明解决其技术问题所采用的技术方案是：
提供一种接触组件，包括动簧部分和匹配的静簧部分，所述动簧部分包括一个动簧片和动簧片两端的动触点，所述两动触点分别与匹配的静簧部分的静触点相对应，在动簧片中，对应于两动触点之间的动簧片的中间部分设为向上凸伸的倒U 形结构。
作为本发明的一优选方案，所述动簧片的倒U 形结构是由动簧片沿着厚度方向折弯后形成的。
作为本发明的一优选方案，所述动簧片为单片结构或是由多片的单片结构层叠靠在一起后构成。
作为本发明的一优选方案，所述匹配的静簧部分的静簧为静簧片，所述静触点固定在静簧片上并使静簧片上电流的流动方向与动簧片的倒U 形结构的两臂的电流流动方向相垂直，动簧片的倒U 形结构的两臂会分别受到方向相反的向外的力，使动簧片的倒U 形结构的两臂向外运动，从而带动动触点向外侧搓动。
作为本发明的一优选方案，所述匹配的静簧部分的静簧为引出端，所述静触点固定在引出端上并使引出端上电流的流动方向与动簧片的倒U 形结构的两臂的电流流动方向相平行；当动簧片的倒U 形结构的两臂之间的距离小于引出端与动簧片的对应臂之间的距离时，动簧片的倒U 形结构的两臂会分别受到方向相反的向外的力，使动簧片的倒U 形结构的两臂向外运动，从而带动动触点向外侧搓动；当动簧片的倒U 形结构的两臂之间的距离大于引出端与动簧片的对应臂之间的距离时，动簧片的倒U 形结构的两臂会分别受到方向相反的向内的力，使动簧片的倒U 形结构的两臂向内运动，从而带动动触点向内侧搓动。
本发明还提供一种高压直流继电器，包括两个由静簧部分构成的静触头和一个动组件；所述动组件包括如上所述的动簧部分，以及两个弹簧和推动杆组件；所述动簧片通过两个弹簧装于推动杆组件中，两个弹簧分别张紧在动簧片与推动杆组件之间并使动簧片上面抵向推动杆组件的顶部内侧。
作为本发明的一优选方案，所述推动杆组件由推动杆部分和U型篮二个独立零件组成，所述U型篮的底部固定在推动杆部分上并将所述动簧片容纳于U型篮中，所述推动杆部分包括用绝缘塑料固定在一起的固定片和推动杆；推动杆部分中还包括由绝缘塑料向两边延伸的弹簧支撑部，所述弹簧的底端抵靠在弹簧支撑部上。
作为本发明的一优选方案，所述弹簧支撑部还一体向上凸伸设有用来定位弹簧的第一凸台，所述弹簧的底端套在所述第一凸台上。
作为本发明的一优选方案，所述两个弹簧为圆锥形结构。
作为本发明的一优选方案，所述动簧片上面顶向推动杆组件的顶部内侧为动簧片上面顶向推动杆组件的U型篮的顶部的内侧，所述U型篮的顶部设有能够让凸伸的倒U 形结构穿出的让位孔。
作为本发明的一优选方案，所述U型篮的顶部的内侧设有第一凸苞，该第一凸苞设置在对应于动簧片的宽度的一边，使得当触点断开时，受U型篮的顶部的内侧第一凸苞与动簧片相顶紧的作用，动簧片向所述宽度的一边倾斜。
作为本发明的一优选方案，所述第一凸苞由U型篮顶部对应位置折弯后形成或者采用模具冲苞形成。
作为本发明的一优选方案，所述U型篮的顶部的内侧还设有第二凸苞，所述第二凸苞设置在对应于动簧片的宽度的另一边，且第二凸苞的高度尺寸设成与第一凸苞的高度尺寸具有高度差，使得当触点断开时，受U型篮的顶部的内侧与动簧片相顶紧的作用，动簧片向所述宽度的对应一边倾斜。
作为本发明的一优选方案，所述U型篮的两侧部的底部设有卡孔，所述固定片的两端分别装配在所述U型篮的两侧部的卡孔中，并通过铆接方式或者激光焊接方式使得固定片的两端分别与所述U型篮的两侧部的卡孔相固定。
采用上述技术方案，相对于现有技术，本发明取得的有益效果是：
（1）由于在动簧片中，在固定两个动触点位置之间的动簧片的中间设有向上凸伸的倒U 形结构，当故障电流产生时（比如4KA/6KA），利用“安培力定律”可知，动簧片的凸伸的倒U 形结构的两臂会受到方向相反的两个向外的力，在两个力的作用下，动簧会向外运动，从而带动动触点向外侧“搓动”，从而避免触点在大电流下粘接；当减小引出端与动簧片距离、加大动簧片的U形开距时，动簧片两臂会受到方向相反的两个向内的力，从而，在两个方向相反且向内的力的作用下，动簧会向内运动，从而带动动触点向内侧“搓动”， 从而避免触点在大电流下粘接。
（2）由于将多片的单片结构层叠靠在一起来构成动簧片，这种结构，有利于散热，同时还可以有效降低刚度，利于变形，在配合动簧片的中间的凸伸的倒U 形结构时，能够很好地带动动触点向内侧“搓动”或向外侧“搓动”， 从而避免触点在大电流下粘接。
（3）由于在U型篮的顶部的内侧设有第一凸苞，该第一凸苞设置在对应于动簧片的宽度的一边，使得当触点断开时，受U型篮的顶部的内侧第一凸苞与动簧片相顶紧的作用，动簧片向所述宽度的一边倾斜。本发明的这种结构，当触点断开时，动簧片在弹簧张紧下会倾斜，从而使燃弧点与接触点分离，保证接触电阻小；当触点闭合时，从动簧部分开始倾斜到动簧水平（即最终动静触点的可靠接触），使得动静触点在接触过程中接触点“滚动”，有效避免粘接，提升了接通抗粘接能力。
（4）由于将两个弹簧设计为圆锥形结构，本发明的这种结构，能够在保证触点压力情况下，产品的动作电压小；或者在保证动作电压情况下，产品的触点压力可以做大，从而保证产品的可靠接触，有利于抵抗大的故障电流。
（5）由于将U型篮和推动杆部分设计成二个独立零件，U型篮为金属材料（无磁材料优选）制成，推动杆部分则由推动杆和金属材料制成的固定片采用一体注塑成型，由于参与注塑的零件结构简单，从而使得推动杆部分的尺寸精度容易保证，大大降低了注塑难度。
附图说明
图1是实施例一本发明的动簧部分的结构示意图；
图2是实施例一本发明的动簧部分（翻转一个角度）的结构示意图；
图3是实施例一本发明的高压直流继电器的结构示意图；
图4是实施例一本发明的高压直流继电器的推动杆部分、双弹簧和动簧的配合示意图；
图5是实施例一本发明的高压直流继电器的触点分离状态的结构示意图；
图6是实施例一本发明的高压直流继电器的触点闭合状态的结构示意图；
图7是实施例一本发明的高压直流继电器的触点分离状态的侧视图；
图8是实施例一本发明的高压直流继电器的触点分离状态（未示出动触点）的侧视图；
图9是实施例一本发明的高压直流继电器的弹簧的结构示意图；
图10是实施例一本发明的高压直流继电器的U型篮的立体构造示意图；
图11是实施例一本发明的高压直流继电器的U型篮的侧视图；
图12是实施例一本发明的高压直流继电器的推动杆部分的立体构造示意图；
图13是实施例一本发明的高压直流继电器的动簧片的倒U 形结构的两臂的一种受力方向示意图；
图14是实施例一本发明的高压直流继电器的动簧片的倒U 形结构的两臂的另一种受力方向示意图；
图15是实施例一本发明的高压直流继电器所用圆锥弹簧与圆柱弹簧的力与位移特性曲线的示意图；
图16是实施例二本发明的高压直流继电器的动簧片的倒U 形结构的两臂的受力方向示意图；
图17是实施例三本发明的高压直流继电器的U型篮的立体构造示意图；
图18是实施例三本发明的高压直流继电器的U型篮的侧视图。
具体实施方式
下面结合附图及实施例详细说明本发明所述的技术方案。
实施例一
参见图1至图2所示，本发明的一种接触组件，接触组件包括动簧部分和匹配的静簧部分，该动簧部分1包括一个动簧片11和两个动触点12，所述两个动触点12分别固定在动簧片11的上面的两端以适配于对应的静触点，在固定两个动触点位置之间的动簧片11的中间设有向上凸伸的倒U 形结构13。当然，也可以是直接将动簧片11的两端作为动触点的方案。
所述动簧片的倒U 形结构13是由动簧片11沿着厚度方向折弯后形成的。
本实施例中，动簧片11是由多片的单片结构层叠靠在一起后构成。当然，也可以是只有一片单片结构来构成动簧片。
参见图1至图15所示，本发明的一种高压直流继电器，包括两个静触头21、22、一个动组件以及动铁芯31、轭铁32、线圈33等部件。
所述动组件包括上述的动簧部分1，以及两个弹簧4和推动杆组件5；所述两个动触点12分别固定在动簧片11的两端并与两个静触头21、22的静触点相对应；所述动簧片11通过两个弹簧4装于推动杆组件5中，两个弹簧4分别张紧在动簧片11与推动杆组件5之间，并使动簧片11上面抵向推动杆组件5的顶部内侧。
所述推动杆组件5由推动杆部分51和金属材料的U型篮52二个独立零件组成，所述U型篮52为开口向下的倒U形状，由顶部521和两侧部522构成，所述U型篮52的底部固定在推动杆部分51上并将所述动簧11片容纳于U型篮52中，所述推动杆部分51包括用绝缘塑料513固定在一起的固定片511和推动杆512；推动杆部分51中还包括由绝缘塑料513向两边延伸的弹簧支撑部514，所述弹簧4的底端抵靠在弹簧支撑部514上。
推动杆512的另一端是与动铁芯31相连接，当动簧片11两端的动触点12分别与两个静触头21、22的静触点相接触时，电流由其中一个静触头流入，经过动簧片后从另一个静触头流出；当线圈33接入电流而使动铁芯31向上运动时，动铁芯31带动推动杆组件向上移动，使动簧片11两端的动触点12与两个静触头21、22的静触点分别相接触，当线圈33断开电流时，动铁芯31受复位弹簧的作用向下运动，动铁芯31则带动推动杆组件向下移动，使动簧片11两端的动触点12与两个静触头21、22分别相分离。
所述弹簧支撑部514还一体向上凸伸设有用来定位弹簧的第一凸台515，所述弹簧4的底端套在所述第一凸台515上。所述弹簧4的顶端则套在动触点32的铆接尾端。
本实施例中，两个弹簧4为圆锥形结构，当然，也可以是圆柱形弹簧。
所述动簧片11上面抵向推动杆组件的顶部内侧为动簧片11上面抵向推动杆组件的U型篮的顶部521的内侧，所述U型篮52的顶部521设有能够让凸伸的倒U 形结构13穿出的让位孔523。
所述U型篮52的顶部521的内侧设有第一凸苞524，该第一凸苞524设置在对应于动簧片11的宽度的一边，使得当触点断开时，受U型篮的顶部521的内侧第一凸苞524与动簧片11相顶紧的作用，动簧片11向所述宽度的一边倾斜（如图8所示）。
所述第一凸苞524由U型篮顶部对应位置折弯后形成或者采用模具冲苞形成。
所述U型篮的两侧部522的底部设有卡孔525，所述固定片511的两端分别装配在所述U型篮52的两侧部的卡孔525中，并通过铆接方式或者激光焊接方式使得固定片511的两端分别与所述两侧部522的卡孔525相固定。
本发明的一种高压直流继电器，线圈33通入工作电流后，推动杆512带动U型篮52和动簧片11向上运动，使得动簧部分的两个动触点12分别与两个静触头21、22的静触点相接触，在动铁芯31移动到位前，推动杆512带动U型篮52继续向上运动，动簧部分1在静触头的阻挡下，压缩两个弹簧4，U型篮的顶部521与动簧片11之间形成一定间隙，动簧片水平。当线圈33断开电流时，动铁芯31向下移动，推动杆512带动U型篮52向下移动，随着动铁芯31的继续下移，两个弹簧4伸张，使动簧片11与U型篮的顶部521相接触，动簧片偏斜，使动簧部分的两个动触点12分别与两个静触头21、22的静触点相分离。
本发明的一种高压直流继电器，静触头21、22即静簧部分是采用引出端结构，静触头21、22的静触点是固定在引出端上并使引出端上电流的流动方向与动簧片11的倒U 形结构13的两臂131的电流流动方向相平行；在故障电流产生时（比如4KA/6KA），利用“安培力定律”可知，当动簧片的倒U 形结构的两臂之间的距离L2小于引出端与动簧片的对应臂之间L1的距离时，动簧片的倒U 形结构的两臂131会分别受到方向相反的向外的力（如图13所示的F11、F12），使动簧片的倒U 形结构的两臂131向外运动，从而带动动触点12向外侧搓动，从而避免触点在大电流下粘接；当动簧片的倒U 形结构的两臂131之间的距离L2大于引出端与动簧片的对应臂之间的距离L1时，动簧片的倒U 形结构的两臂131会分别受到方向相反的向内的力（如图14所示的F21、F22），使动簧片的倒U 形结构的两臂131向内运动，从而带动动触点12向内侧搓动，从而避免触点在大电流下粘接。
也就是说，本发明通过调节倒U形动簧片的开距L2和引出端与动簧片开距L1之间的关系，可以实现动簧片的倒U 形结构的两臂131带动动触点12向外侧搓动或向内侧搓动，在U形动簧片开距L2小于引出端与动簧片开距L1时，动簧片两臂受力向外，从而带动触点向外“搓动”， 在U形动簧片开距L2大于引出端与动簧片开距L1时，动簧片两臂受力向内，从而带动触点向内“搓动”。
本发明的一种高压直流继电器，采用多片的单片结构层叠靠在一起来构成动簧片11，这种结构，有利于散热，同时还可以有效降低刚度，利于变形，在配合动簧片的中间的凸伸的倒U 形结构13时，能够很好地带动动触点向内侧“搓动”或向外侧“搓动”， 从而避免触点在大电流下粘接。
本发明的一种高压直流继电器，在U型篮52的顶部521的内侧设有第一凸苞524，该第一凸苞524设置在对应于动簧片11的宽度的一边，使得当触点断开时，受U型篮52的顶部521的内侧第一凸苞524与动簧片11相顶紧的作用，动簧片11向所述宽度的一边倾斜。本发明的这种结构，当触点断开时，动簧片11在弹簧4张紧下会倾斜，从而使燃弧点与接触点分离，保证接触电阻小；当触点闭合时，从动簧部分开始倾斜到动簧水平（即最终动静触点的可靠接触），使得动静触点在接触过程中接触点“滚动”，有效避免粘接，提升了接通抗粘接能力。
本发明的一种高压直流继电器，将两个弹簧4设计为圆锥形结构，本发明的这种结构，能够在保证触点压力情况下，产品的动作电压小；或者在保证动作电压情况下，产品的触点压力可以做大，从而保证产品的可靠接触，有利于抵抗大的故障电流。
本实施例是采用双圆锥弹簧21方案，圆锥弹簧也称圆锥螺旋压缩弹簧或称宝塔形弹簧，如图15所示，图中的M1为圆锥弹簧的力与位移特性曲线，M2为圆柱弹簧的力与位移特性曲线，M2实际上为直线，圆锥弹簧其特征在于刚度是非线性的，也就是其在前段位移下力缓慢上升，而在后段随着压缩量加大，力急剧上升。这与圆柱弹簧刚度恒定，特性是直线有很大差别。在位移的前段，圆柱弹簧的力F2是大于圆锥弹簧的力F1。
本发明的直流产品是“螺旋管”单稳态结构，产品的动作电压和产品的触头压力(如图15中的F3)以及初始张紧力（如图15中：圆锥弹簧F1、圆柱弹簧F2）是直接相关的，初始张紧力越大，动作电压越大。如图15所示，在终压力F3一致的情况下，圆锥弹簧的初始张力F1比圆柱弹簧的初始张力F2小，所以其动作电压会比较小。同样，在保证动作电压情况下，产品的触点压力可以做大。
本发明的一种高压直流继电器，将U型篮52和推动杆部分51设计成二个独立零件，U型篮52为金属材料（无磁材料优选）制成，推动杆部分51则由推动杆512和金属材料制成的固定片511采用一体注塑成型，由于参与注塑的零件结构简单，从而使得推动杆部分51的尺寸精度容易保证，大大降低了注塑难度。
实施例二
参见图16所示，本发明的一种高压直流继电器，与实施例一的不同之处在于，匹配的静簧部分（即静触头）的静簧为静簧片，所述静触点固定在静簧片上并使静簧片上电流的流动方向与动簧片的倒U 形结构的两臂131的电流流动方向相垂直，动簧片的倒U 形结构的两臂131会分别受到方向相反的向外的力（如图16所示的F31、F32），使动簧片的倒U 形结构的两臂131向外运动，从而带动动触点12向外侧搓动。
实施例三
参见图17至图18所示，本发明的一种高压直流继电器，与实施例一的不同之处在于，即U型篮52的顶部521的内侧还设有第二凸苞526，所述第二凸苞526设置在对应于动簧片11的宽度的另一边，且第二凸苞526的高度尺寸设成与第一凸苞524的高度尺寸具有高度差，本实施例中，第二凸苞526的高度尺寸大于第一凸苞524的高度尺寸，使得当触点断开时，受U型篮52的顶部521的内侧与动簧片11相顶紧的作用，动簧片11向所述宽度的另一边倾斜。本发明方案是设有二个凸苞，利用二个凸苞的高度差，来使得触点断开时，动簧片向所述宽度的对应一边倾斜。
第二凸苞526由U型篮顶部521对应位置折弯后形成或者采用模具冲苞形成。
上述只是本发明的较佳实施例，并非对本发明作任何形式上的限制。虽然本发明已以较佳实施例揭露如上，然而并非用以限定本发明。任何熟悉本领域的技术人员，在不脱离本发明技术方案范围的情况下，都可利用上述揭示的技术内容对本发明技术方案作出许多可能的变动和修饰，或修改为等同化的等效实施例。因此，凡是未脱离本发明技术方案的内容，依据本发明技术实质对以上实施例所做的任何简单修改、等同变化及修饰，均应落在本发明技术方案保护的范围内。
工业实用性
本发明是在固定两个动触点位置之间的动簧片的中间设有向上凸伸的倒U 形结构，动簧片的倒U 形结构可以是由动簧片沿着厚度方向折弯后形成的，两个动触点可以是单独的零件而固定在动簧片的两端，也可以是直接利用动簧片的两端来作为动触点；动簧片通过两个弹簧装于推动杆组件中，两个弹簧使动簧片上面抵向推动杆组件的顶部内侧；推动杆组件则由推动杆部分和金属材料的U型篮二个独立零件组成， U型篮为开口向下的倒U形状， U型篮的底部固定在推动杆部分上并将动簧片容纳于U型篮中，推动杆部分包括用绝缘塑料固定在一起的固定片和推动杆；推动杆部分中还包括由绝缘塑料向两边延伸的弹簧支撑部，弹簧的底端抵靠在弹簧支撑部上；本发明的这种结构在工业上便于实现，而且动簧片、推动杆部分、金属材料的U型篮以及对应相配合的静触头、动铁芯、轭铁和线圈等部件在工业上也便于加工。

Claims (14)

  1. 一种接触组件，其特征在于：包括动簧部分和匹配的静簧部分，该动簧部分包括一个动簧片和动簧片两端的动触点，所述两动触点分别与匹配的静簧部分的静触点相对应，其特征在于：在动簧片中，对应于两动触点之间的动簧片的中间部分设为向上凸伸的倒U 形结构。
  2. 根据权利要求1所述的接触组件，其特征在于：所述动簧片的倒U 形结构是由动簧片沿着厚度方向折弯后形成的。
  3. 根据权利要求1所述的接触组件，其特征在于：所述动簧片为单片结构或是由多片的单片结构层叠靠在一起后构成。
  4. 根据权利要求1或2或3所述的接触组件，其特征在于：所述匹配的静簧部分的静簧为静簧片，所述静触点固定在静簧片上并使静簧片上电流的流动方向与动簧片的倒U 形结构的两臂的电流流动方向相垂直，动簧片的倒U 形结构的两臂会分别受到方向相反的向外的力，使动簧片的倒U 形结构的两臂向外运动，从而带动动触点向外侧搓动。
  5. 根据权利要求1或2或3所述的接触组件，其特征在于：所述匹配的静簧部分的静簧为引出端，所述静触点固定在引出端上并使引出端上电流的流动方向与动簧片的倒U 形结构的两臂的电流流动方向相平行；当动簧片的倒U 形结构的两臂之间的距离小于引出端与动簧片的对应臂之间的距离时，动簧片的倒U 形结构的两臂会分别受到方向相反的向外的力，使动簧片的倒U 形结构的两臂向外运动，从而带动动触点向外侧搓动；当动簧片的倒U 形结构的两臂之间的距离大于引出端与动簧片的对应臂之间的距离时，动簧片的倒U 形结构的两臂会分别受到方向相反的向内的力，使动簧片的倒U 形结构的两臂向内运动，从而带动动触点向内侧搓动。
  6. 一种高压直流继电器，包括两个由静簧部分构成的静触头和一个动组件；其特征在于：所述动组件包括如权利要求1至5中任一权利要所述的动簧部分，以及两个弹簧和推动杆组件；所述动簧片通过两个弹簧装于推动杆组件中，两个弹簧分别张紧在动簧片与推动杆组件之间并使动簧片上面抵向推动杆组件的顶部内侧。
  7. 根据权利要求6所述的高压直流继电器，其特征在于：所述推动杆组件由推动杆部分和U型篮二个独立零件组成，所述U型篮的底部固定在推动杆部分上并将所述动簧片容纳于U型篮中，所述推动杆部分包括用绝缘塑料固定在一起的固定片和推动杆；推动杆部分中还包括由绝缘塑料向两边延伸的弹簧支撑部，所述弹簧的底端抵靠在弹簧支撑部上。
  8. 根据权利要求7所述的高压直流继电器，其特征在于：所述弹簧支撑部还一体向上凸伸设有用来定位弹簧的第一凸台，所述弹簧的底端套在所述第一凸台上。
  9. 根据权利要求6或7或8所述的高压直流继电器，其特征在于：所述两个弹簧为圆锥形结构。
  10. 根据权利要求7所述的高压直流继电器，其特征在于：所述动簧片上面顶向推动杆组件的顶部内侧为动簧片上面顶向推动杆组件的U型篮的顶部的内侧，所述U型篮的顶部设有能够让凸伸的倒U 形结构穿出的让位孔。
  11. 根据权利要求7所述的高压直流继电器，其特征在于：所述U型篮的顶部的内侧设有第一凸苞，该第一凸苞设置在对应于动簧片的宽度的一边，使得当触点断开时，受U型篮的顶部的内侧第一凸苞与动簧片相顶紧的作用，动簧片向所述宽度的一边倾斜。
  12. 根据权利要求11所述的高压直流继电器，其特征在于：所述第一凸苞由U型篮顶部对应位置折弯后形成或者采用模具冲苞形成。
  13. 根据权利要求11所述的高压直流继电器，其特征在于：所述U型篮的顶部的内侧还设有第二凸苞，所述第二凸苞设置在对应于动簧片的宽度的另一边，且第二凸苞的高度尺寸设成与第一凸苞的高度尺寸具有高度差，使得当触点断开时，受U型篮的顶部的内侧与动簧片相顶紧的作用，动簧片向所述宽度的对应一边倾斜。
  14. 根据权利要求7所述的高压直流继电器，其特征在于：所述U型篮的两侧部的底部设有卡孔，所述固定片的两端分别装配在所述U型篮的两侧部的卡孔中，并通过铆接方式或者激光焊接方式使得固定片的两端分别与所述U型篮的两侧部的卡孔相固定。
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