WO2023122872A1 - 空调翅片模具 - Google Patents

空调翅片模具 Download PDF

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Publication number
WO2023122872A1
WO2023122872A1 PCT/CN2021/141582 CN2021141582W WO2023122872A1 WO 2023122872 A1 WO2023122872 A1 WO 2023122872A1 CN 2021141582 W CN2021141582 W CN 2021141582W WO 2023122872 A1 WO2023122872 A1 WO 2023122872A1
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WO
WIPO (PCT)
Prior art keywords
fixed
die
base
punch
bottom plate
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PCT/CN2021/141582
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English (en)
French (fr)
Inventor
蔡磊明
蒋文红
王小刚
许庆松
叶民生
Original Assignee
无锡微研股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 无锡微研股份有限公司 filed Critical 无锡微研股份有限公司
Priority to CN202180004377.2A priority Critical patent/CN114521158A/zh
Priority to PCT/CN2021/141582 priority patent/WO2023122872A1/zh
Publication of WO2023122872A1 publication Critical patent/WO2023122872A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/10—Die sets; Pillar guides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/10—Die sets; Pillar guides
    • B21D37/12—Particular guiding equipment, e.g. pliers; Special arrangements for interconnection or cooperation of dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
    • B21D53/022—Making the fins

Definitions

  • the present application relates to the field of fin stamping dies, for example, relates to an air conditioner fin die.
  • the air conditioner fin refers to the evaporator, which is composed of strips of thin aluminum material.
  • the position of the air conditioner fin is different.
  • the fin In the indoor unit, the fin is located behind the dust screen, and in the outdoor unit Among them, the fins are located at the back of the machine, and the fins are generally produced by stamping.
  • a kind of fin mold comprises upper formwork, lower formwork, punch fixed plate and die fixed plate, the die fixed plate is fixed on the upper end of lower formwork, is provided with die on the die set plate, and A punch matched with the die is arranged on the mold fixing plate, a spring is arranged between the punch fixing plate and the die fixing plate, side baffles are arranged on the die fixing plate, and the side baffles include vertically arranged vertical section and horizontally arranged horizontal section, the horizontal section is connected to the upper end of the vertical section, the lower end of the vertical section is connected to the die fixing plate, and the punch fixing plate leans against the lower end surface of the horizontal section under the action of the spring,
  • the upper end surface of the punch fixed plate is provided with a sub-mold switching device.
  • the sub-mold switching device includes a moving frame, a plurality of driving rods, a plurality of pads and a driving assembly. Corresponding distribution.
  • the air-conditioning fin mold in the related art can realize fast switching of sub-moulds, and has the characteristics of simple structure, fast switching speed and stable switching.
  • the stamping position of the fin cannot be determined, and the stamping precision is inaccurate.
  • the application provides an air-conditioning fin mold, which can improve punching accuracy when producing air-conditioning fins, including a bottom plate, a component mold, a vertical rod, a chute, a cross bar, a connecting rod, and a driving mechanism;
  • the component mold includes a lower mold assembly and an upper mold assembly, and the upper mold assembly is located above the lower mold assembly;
  • the lower mold assembly includes a lower mold base and a die, wherein the lower mold The base is fixed on the top of the bottom plate, and the top of the lower die base is connected with the die;
  • the upper die assembly includes an upper die base, a blank holder, a punch, a punch fixing plate and a guide mechanism, wherein the The bottom end of the upper die base is fixed with the blank holder, the bottom end of the blank holder is fixed with the punch and the guide mechanism, and the punch fixing plate is fixed below the guide mechanism, so A through hole matching the punch is provided on the punch fixing plate;
  • the chute is opened on the inner side of each pole;
  • the cross bar is located between the two vertical bars in the same horizontal direction, and the two vertical bars are engaged and slid through the chute;
  • the connecting rod is fixedly connected to the top of the upper die base, and is located between the two cross bars;
  • the driving mechanism is arranged on the bottom plate, and the driving mechanism is configured to drive the cross bar to move up and down along the chute.
  • the air-conditioning fin mold also includes a rotating mechanism and a limiting mechanism.
  • the driving mechanism includes a fixed plate, a bearing seat, a screw, a telescopic tube and an outer tube; the two fixed plates are fixed between the two cross bars and are symmetrical about the connecting rods, and the two The bearing seats are mounted symmetrically on the top of the bottom plate, each of the bearing seats is connected with a screw rod in the vertical direction, and the outer peripheral side of each screw rod is threaded with the telescopic tube, and the top of the telescopic tube Fixed with the bottom end of the corresponding fixed plate, the outer peripheral side of each telescopic tube is sleeved with the outer tube fixed with the corresponding vertical rod;
  • the rotating mechanism is arranged on the bottom plate, and the rotating mechanism is configured to drive the screw to rotate;
  • the limiting mechanism is arranged on the bottom plate, and the limiting mechanism is configured to limit the rotation of the telescopic tube.
  • the limiting mechanism includes a limiting groove and a limiting block; the limiting groove (1501) is respectively set on the inner wall of each outer tube and is located in the vertical direction, and the limiting block is fixed on each The outer side of the telescopic tube is matched with the corresponding limiting groove.
  • sliders are respectively fixed on both sides of each cross bar, and each slider is located in a corresponding chute.
  • the guide mechanism includes a guide rod and a spring; the two guide rods are fixed on the top of the punch fixing plate and are symmetrical about the punch, and the upper die holder and the blank holder are respectively provided with There are two guide holes corresponding to the guide rods, the spring is sleeved on the outer peripheral side of each guide rod, and is located between the punch fixing plate and the blank holder.
  • the two cross bars and the connecting rod can be regarded as a hanger.
  • the hanger On the one hand, the hanger is engaged and slidably connected between a plurality of chutes, and on the other hand, it is fixed with the upper mold base. In this way, the drive mechanism Under the action of the hanger, the hanger can drive the upper die base to move up and down, so that the upper die base can keep moving up and down vertically for precise stamping.
  • Fig. 1 is the schematic diagram of the three-dimensional structure of the present application.
  • Fig. 2 is the schematic diagram of the front view structure of the present application.
  • Fig. 3 is the side view structural representation of the present application.
  • FIG. 4 is a schematic diagram of partial structural decomposition of the present application.
  • Fig. 5 is the enlarged schematic diagram of the structure of A place of the present application.
  • Fig. 6 is the enlarged schematic view of the structure at B of the present application.
  • the air-conditioning fin mold for the production of air-conditioning fins that can improve punching accuracy includes a bottom plate 1 and a A die assembly, a mold consisting of an upper die assembly positioned above the lower die assembly, wherein the lower die assembly includes a lower mold base 2 fixed on the top of the bottom plate 1, the top of the lower mold base 2 is connected with a die 3;
  • the mold assembly includes an upper mold base 4, a blank holder 5 is fixed at the bottom of the upper mold base 4, a punch 6 and a guide mechanism 8 are fixed at the bottom of the binder ring 5, and a convex mold is fixed below the guide mechanism 8.
  • Die fixing plate 7, punch fixing plate 7 is provided with a through hole matched with punch 6, in order to make punch 6 pass through punch fixing plate 7.
  • the four corners of the top of the base plate 1 are fixed with uprights 9, and the inner side of each upright 9 is provided with a chute 10, and the two uprights 9 located in the same horizontal direction are connected by sliding through the chute 10.
  • a crossbar 11 fixed to the top of the upper mold base 4 is connected between the two crossbars 11.
  • a driving mechanism 13 for driving the crossbar 11 to move up and down along the chute 10 is provided on the bottom plate 1.
  • the two cross bars 11 and the connecting rod 12 can be regarded as a hanger.
  • the hanger is engaged and slidably connected between a plurality of chute 10, and on the other hand, it is fixed with the upper mold base 4. In this way, Under the action of the driving mechanism 13, the hanger can drive the upper die base 4 to move up and down, so that the upper die base 4 keeps moving up and down vertically for precise stamping.
  • the specific structure of the driving mechanism 13 is shown in Figure 4.
  • the outer peripheral side of 1303 is threaded with the telescopic tube 1304 fixed at the top and the bottom end of the corresponding fixed plate 1301, and the outer peripheral side of each telescopic tube 1304 is sleeved with an outer tube 1305 fixed with the corresponding vertical rod 9.
  • the bottom plate 1 is provided with a rotating mechanism 14 for driving the screw rod 1303 to rotate and a limit mechanism 15 for limiting the rotation of the telescopic tube 1304.
  • the motors 1401 are fixedly sleeved with intermeshed bevel gears 1402 on the output shaft of each motor 1401 and the outer peripheral side of the corresponding screw rod 1303, and the specific structure of the limit mechanism 15 is shown in Figure 5 and Figure 6.
  • the position mechanism 15 includes position-limiting grooves 1501 respectively provided on the inner wall of each outer tube 1305 and located in the vertical direction.
  • Bit block 1502 like this, under the drive of motor 1401, just can make two meshing bevel gears 1402 drive screw mandrel 1303 to rotate, and because the effect of limit mechanism 15, make the expansion tube 1304 that is threadedly connected with screw mandrel 1303 It can only move up and down and not turn.
  • sliders 1101 are fixed on both sides of each cross bar 11 , and each slider 1101 is located in the corresponding sliding groove 10 and is slidably connected with the sliding groove 10 .
  • the guide mechanism 8 includes two guide rods 801 that are fixed on the top of the punch fixing plate 7 and are symmetrical to the punch 6.
  • Both are provided with two guide holes corresponding to the guide rods 801.
  • a spring 802 located between the punch fixing plate 7 and the blank holder 5 is sleeved on the outer peripheral side of each guide rod 801.
  • the spring 802 will be compressed by the blank holder 5, so that the punch 6 passes through the through hole on the punch fixing plate 7, while the guide rod 801 is equivalent to passing through the upper mold base upwards. 4 and the guide hole on the blank holder 5, through such arrangement, the punch 6 can be moved vertically downwards, reducing the possibility of its deviation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

一种空调翅片模具，其包括底板(1)、下模组件和上模组件，上模组件位于下模组件上方。下模组件包括下模座(2)和凹模(3)，其中，下模座(2)固定在底板(1)顶端，下模座(2)的顶端连接有凹模(3)。上模组件包括上模座(4)、凸模(6)、凸模固定板(7)以及导向机构(8)，上模座(4)的底端固定有压边圈(5)，压边圈(5)的底端固定有凸模(6)和导向机构(8)，导向机构(8)的下方固定有凸模固定板(7)，凸模固定板(7)上贯穿开设有与凸模(6)相适配的通孔。底板(1)的顶端四角均固定有立杆(9)，每个立杆(9)的内侧均开设有滑槽(10)，位于同一水平方向的两个立杆(9)之间均通过滑槽(10)卡合滑动连接有一横杆(11)，两个横杆(11)之间连接有一与上模座(4)顶端固定的连接杆(12)，底板(1)上设置有用于驱动横杆(11)沿滑槽(10)上下移动的驱动机构(13)。该空调翅片模具在驱动机构(13)的作用下，可使吊架带动上模座(4)上下移动，从而使上模座(4)保持竖直上下移动进行精确冲压。

Description

空调翅片模具 技术领域
本申请涉及翅片冲压模具领域，例如涉及一种空调翅片模具。
背景技术
空调翅片指蒸发器，由一条条很薄的铝质材料组成，在室内机和室外机中，空调翅片的位置不同，在室内机中，翅片位于防尘网的后面，在室外机中，翅片位于机器的后面，翅片一般通过冲压的方式生产成型。
相关技术中公开了一种翅片模具，包括上模板、下模板、凸模固定板及凹模固定板，凹模固定板固定于下模板的上端，凹模固定板上设置有凹模，凸模固定板上设置有与凹模相配合的凸模，凸模固定板与凹模固定板之间设置有弹簧，凹模固定板上设置有侧挡板，侧挡板包括竖直布置的竖段及水平布置的横段，横段连接于所述竖段的上端，竖段的下端连接于凹模固定板上，凸模固定板在弹簧的作用下抵靠在横段的下端面上，凸模固定板的上端面上设置有子模切换装置，子模切换装置包括移动架、多根打杆、多个垫块及驱动组件，多根打杆与多个垫块数量相同且一一对应分布。相关技术中的空调翅片模具能实现子模的快速切换，并具有结构简单、切换速度快、切换稳定的特点。然而，相关技术中的空调翅片模具存在对翅片的冲压位置就无法确定，冲压精度失准的情况。
发明内容
本申请提供了一种空调翅片模具，可在生产空调翅片时提高冲切精度，包括底板，组件模具，立杆，滑槽，横杆，连接杆，以及驱动机构；
所述组件模具包括下模组件和上模组件，所述上模组件位于所述下模组件上方；所述下模组件包括下模座和凹模，其中，所述下模座固定在底板顶端，所述下模座的顶端连接有所述凹模；所述上模组件包括上模座，压边圈，凸模，凸模固定板以及导向机构，其中，所述上模座的底端固定有所述压边圈，所述压边圈的底端固定有所述凸模和所述导向机构，所述导向机构的下方固定有所述凸模固定板，所述凸模固定板上贯穿开设有与所述凸模相适配的通孔；
所述立杆为多个，所述多个立杆分别固定于所述底板的顶端四角；
所述滑槽开设于每个立杆的内侧；
所述横杆位于同一水平方向的两个所述立杆之间，且通过所述滑槽卡合滑动两个所述立杆；
所述连接杆与所述上模座顶端固定连接，且位于两个所述横杆之间；
所述驱动机构设置于所述底板上，所述驱动机构设置为驱动所述横杆沿所述滑槽上下移动。
例如，所述空调翅片模具还包括转动机构和限位机构。其中，所述驱动机构包括固定板，轴承座，丝杆，伸缩管以及外管；两个所述固定板固定在两个所述横杆之间且关于所述连接杆对称，两个所述轴承座对称安装于所述底板的顶端，每个所述轴承座上连接有位于竖直方向的丝杆，每个丝杆的外周侧螺纹套接有所述伸缩管，所述伸缩管的顶端与对应的固定板的底端固定，每个伸缩管的外周侧套接有与对应的立杆固定的所述外管；
所述转动机构设置于所述底板上，所述转动机构设置为驱动所述丝杆进行转动；
所述限位机构设置于所述底板上，所述限位机构设置为限制所述伸缩管转动。
例如，所述限位机构包括限位槽和限位块；所述限位槽(1501)分别开设在每个外管内壁上且位于所述竖直方向，所述限位块固定在每个伸缩管的外侧，且与对应的限位槽配合连接。
例如，每个所述横杆的两侧分别固定有滑块，每个滑块位于对应的滑槽内。
例如，所述导向机构包括导向杆和弹簧；两个所述导向杆固定在所述凸模固定板的顶端且关于所述凸模对称，所述上模座和所述压边圈上分别开设有两个与所述导向杆相对应的导向孔，所述弹簧套接于每个导向杆的外周侧，且位于所述凸模固定板和所述压边圈之间。
本申请中，两个横杆和连接杆可看成一个吊架，这个吊架一方面卡合滑动连接在多个滑槽之间，另一方面与上模座进行固定，这样，在驱动机构的作用下，可使吊架带动上模座上下移动，从而使上模座保持竖直上下移动进行精确冲压。
附图说明
附图用来提供对本申请的进一步理解，并且构成说明书的一部分，与本申请的实施例一起用于解释本申请，并不构成对本申请的限制。在附图中：
图1为本申请的立体结构示意图；
图2为本申请的主视结构示意图；
图3为本申请的侧视结构示意图；
图4为本申请的部分结构分解示意图；
图5为本申请的A处结构放大示意图；
图6为本申请的B处结构放大示意图；
图中：1、底板；2、下模座；3、凹模；4、上模座；5、压边圈；6、凸模；7、凸模固定板；8、导向机构；801、导向杆；802、弹簧；9、立杆；10、滑槽；11、横杆；1101、滑块；12、连接杆；13、驱动机构；1301、固定板；1302、轴承座；1303、丝杆；1304、伸缩管；1305、外管；14、转动机构；1401、电机；1402、锥齿轮；15、限位机构；1501、限位槽；1502、限位块。
具体实施方式
本申请实施方式中提供的可提高冲切精度的空调翅片生产用空调翅片模具，如图1、图2、图3、图4、图5和图6所示，包括底板1和由下模组件、位于下模组件上方的上模组件组成的模具，其中，下模组件包括固定在底板1顶端的下模座2，下模座2的顶端连接有凹模3；上模组件包括上模座4，在上模座4的底端固定有压边圈5，在压边圈5的底端固定有凸模6和导向机构8，导向机构8的下方固定有凸模固定板7，凸模固定板7上贯穿开设有与凸模6相适配的通孔，用以使凸模6能够穿过凸模固定板7。
另外，在底板1的顶端四角均固定有立杆9，每个立杆9的内侧均开设有滑槽10，位于同一水平方向的两个立杆9之间均通过滑槽10卡合滑动连接有一横杆11，这两个横杆11之间连接有一与上模座4顶端固定的连接杆12，同时，在底板1上设置有用于驱动横杆11沿滑槽10上下移动的驱动机构13，如此，两个横杆11和连接杆12可看成一个吊架，这个吊架一方面卡合滑动连接在多个滑槽10之间，另一方面与上模座4进行固定，这样，在驱动机构13的作用下，可使吊架带动上模座4上下移动，从而使上模座4保持竖直上下移动进行精确冲压。
关于驱动机构13，其可以使用相关技术中的气压方式进行，也可以使用以 下方式，驱动机构13的具体结构如图4所示，驱动机构13包括固定在两个横杆11之间的且关于连接杆12对称的两个固定板1301，同时，在底板1的顶端对称安装有两个轴承座1302，在每个轴承座1302上均连接有位于竖直方向的丝杆1303，每个丝杆1303的外周侧均螺纹套接有顶端与对应的固定板1301底端固定的伸缩管1304，每个伸缩管1304的外周侧均套接有与对应的立杆9固定的外管1305，同时，在底板1上设置有用于驱动丝杆1303进行转动的转动机构14和用于限制伸缩管1304转动的限位机构15，如图4所示，转动机构14包括对称安装在底板1上的两个电机1401，在每个电机1401的输出轴和对应的丝杆1303的外周侧均固定套接有相互啮合的锥齿轮1402，而限位机构15的具体结构如图5和图6所示，限位机构15包括分别开设在每个外管1305内壁上的且位于竖直方向的限位槽1501，同时，在每个伸缩管1304的外侧均固定有与对应的限位槽1501配合连接的限位块1502，如此，在电机1401的驱动下，便可使两个啮合的锥齿轮1402带动丝杆1303进行转动，并且由于限位机构15的作用，使与丝杆1303螺纹连接的伸缩管1304只能上下移动而不能转动。
如图1和图4所示，在每个横杆11的两侧均固定有滑块1101，每个滑块1101均位于对应的滑槽10内与滑槽10滑动连接。
导向机构8的具体结构如图2所示，导向机构8包括固定在凸模固定板7顶端的两个关于凸模6对称的导向杆801，另外，在上模座4和压边圈5上均开设有两个与导向杆801相对应的导向孔，同时，在每个导向杆801的外周侧均套接有位于凸模固定板7和压边圈5之间的弹簧802，如此，在下模座4下移的时候，会通过压边圈5压缩弹簧802，从而使凸模6穿过凸模固定板7上的通孔，而相对的，导向杆801相当于向上穿过上模座4和压边圈5上的导向孔，通过这样的设置，可使凸模6竖直向下的移动，减小其偏移的可能性。
需要说明的是，在本文中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。

Claims (5)

  1. 一种空调翅片模具，包括底板(1)，组件模具，立杆(9)，滑槽(10)，横杆(11)，连接杆(12)，以及驱动机构(13)；
    所述组件模具包括下模组件和上模组件，所述上模组件位于所述下模组件上方；所述下模组件包括下模座(2)和凹模(3)，其中，所述下模座(2)固定在底板(1)顶端，所述下模座(2)的顶端连接有所述凹模(3)；所述上模组件包括上模座(4)，压边圈(5)，凸模(6)，凸模固定板(7)以及导向机构(8)，其中，所述上模座(4)的底端固定有所述压边圈(5)，所述压边圈(5)的底端固定有所述凸模(6)和所述导向机构(8)，所述导向机构(8)的下方固定有所述凸模固定板(7)，所述凸模固定板(7)上贯穿开设有与所述凸模(6)相适配的通孔；
    所述立杆(9)为多个，多个所述立杆(9)分别固定于所述底板(1)的顶端四角；
    所述滑槽(10)开设于每个所述立杆(9)的内侧；
    所述横杆(11)位于同一水平方向的两个所述立杆(9)之间，且通过所述滑槽(10)卡合滑动连接；
    所述连接杆(12)与所述上模座(4)顶端固定连接，且位于两个所述横杆(11)之间；
    所述驱动机构(13)设置于所述底板(1)上，所述驱动机构(13)设置为驱动所述横杆(11)沿所述滑槽(10)上下移动。
  2. 根据权利要求1所述的模具，还包括转动机构(14)和限位机构(15)，
    其中，所述驱动机构(13)包括固定板(1301)，轴承座(1302)，丝杆(1303)，伸缩管(1304)以及外管(1305)；
    两个所述固定板(1301)固定在两个所述横杆(11)之间，且关于所述连接杆(12)对称；
    两个所述轴承座(1302)对称安装于所述底板(1)的顶端，每个所述轴承座(1302)上连接有位于竖直方向的丝杆(1303)；
    每个所述丝杆(1303)的外周侧螺纹套接有所述伸缩管(1304)；
    所述伸缩管(1304)的顶端与对应的固定板(1301)的底端固定，每个伸缩管(1304)的外周侧套接有与对应的立杆(9)固定的所述外管(1305)；
    所述转动机构(14)设置于所述底板(1)上，所述转动机构(14)设置为 驱动所述丝杆(1303)进行转动；
    所述限位机构(15)设置于所述底板(1)上，所述限位机构(15)设置为限制所述伸缩管(1304)转动。
  3. 根据权利要求2所述的模具，其中，所述限位机构(15)包括限位槽(1501)和限位块(1502)；
    所述限位槽(1501)分别开设在每个外管(1305)内壁上，且位于所述竖直方向；
    所述限位块(1502)固定在每个伸缩管(1304)的外侧，且与对应的限位槽(1501)配合连接。
  4. 根据权利要求1所述的模具，其中，每个横杆(11)的两侧分别固定有滑块(1101)，每个滑块(1101)位于对应的滑槽(10)内。
  5. 根据权利要求1所述的模具，其中，所述导向机构(8)包括导向杆(801)和弹簧(802)；
    两个所述导向杆(801)固定在所述凸模固定板(7)的顶端，且关于所述凸模(6)对称；所述上模座(4)和所述压边圈(5)上分别开设有两个与所述导向杆(801)相对应的导向孔；
    所述弹簧(802)套接于每个导向杆(801)的外周侧，且位于所述凸模固定板(7)和所述压边圈(5)之间。
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