WO2011047557A1 - 轴端密封结构及具有该轴端密封结构的混凝土搅拌机 - Google Patents

轴端密封结构及具有该轴端密封结构的混凝土搅拌机 Download PDF

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Publication number
WO2011047557A1
WO2011047557A1 PCT/CN2010/074653 CN2010074653W WO2011047557A1 WO 2011047557 A1 WO2011047557 A1 WO 2011047557A1 CN 2010074653 W CN2010074653 W CN 2010074653W WO 2011047557 A1 WO2011047557 A1 WO 2011047557A1
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Prior art keywords
gap
shaft end
main shaft
ring
seal structure
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PCT/CN2010/074653
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English (en)
French (fr)
Inventor
邹祥
陈明林
谭学军
Original Assignee
湖南三一智能控制设备有限公司
三一重工股份有限公司
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Application filed by 湖南三一智能控制设备有限公司, 三一重工股份有限公司 filed Critical 湖南三一智能控制设备有限公司
Priority to BR112012009268A priority Critical patent/BR112012009268A2/pt
Publication of WO2011047557A1 publication Critical patent/WO2011047557A1/zh

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
    • F16J15/3436—Pressing means
    • F16J15/344—Pressing means the pressing force being applied by means of an elastic ring supporting the slip-ring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
    • B28C5/0806—Details; Accessories
    • B28C5/0818—Charging or discharging gates or chutes; Sealing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/44—Free-space packings
    • F16J15/447—Labyrinth packings
    • F16J15/4472—Labyrinth packings with axial path

Definitions

  • the present invention relates to a shaft end seal structure and a concrete mixer having the shaft end seal structure.
  • BACKGROUND OF THE INVENTION Agitators are a core component of concrete mixing equipment.
  • the problem of outflow leakage of water and mud in the mixer has always been a concern in the industry.
  • a slight mud leakage will cause rapid wear of the shaft end, causing failure of related parts and affecting the operation and use of the entire mixing station. Therefore, how to improve the leakage of the shaft end has become an urgent need.
  • the shaft end of the conventional mixer main shaft is usually sealed by the sealing method shown in Fig. 1.
  • the present invention has been made to solve the above problems, and provides a novel shaft end seal structure of a mixer main shaft, which can prevent mud from directly infiltrating into an oil passage and thereby flow out, thereby improving the sealing ability and reliability of the structure. .
  • a shaft end seal structure of a mixer for a concrete mixer, the shaft end seal structure comprising: a wear ring, a rainbow wall connected to the mixer, and a dust cover; Connecting to the main shaft of the mixer and rotating synchronously with the main shaft, a first gap is formed between the dust cover and the wear ring, the first gap is in communication with the lubricating oil chamber; the sealing ring, Provided between the rainbow wall and the main shaft, formed between the seal ring and the main shaft a second gap, the second gap forms a labyrinth seal, and the second gap communicates with the first gap.
  • one end of the seal ring adjacent to the main shaft has a stepped cross section, so that a stepped second gap is formed between the tight ring and the main shaft.
  • the agitating arm of the agitator is mounted on the main shaft and adjacent to the wear ring and the dust cap, the seal ring being disposed between the cylinder wall and the agitating arm.
  • the radial portion of the second gap extends beyond the axial portion of the first gap in a radially outward direction.
  • the axial portion and the radial portion of the second gap have a uniform gap width.
  • the gap width is 2 mm.
  • the second gap has a meandering shape in the form of a plurality of steps.
  • a concrete mixer comprising a shaft end seal structure having the above features.
  • a seal ring is provided between the end wall of the cylinder block and the agitating arm, a labyrinth seal is formed between the seal ring and the agitating arm, through which the labyrinth seal and The lubricating oil pressure prevents the mud outflow in the rainbow of the mixer and the direct contact with the lubricating oil, which plays a good role of shaft end sealing, which improves the reliability and service life of the equipment.
  • FIG. 1 shows a prior art concrete mixer shaft end seal structure 2 shows a concrete mixer shaft end seal structure according to a preferred embodiment of the present invention
  • FIG. 3 is an enlarged view of a portion I of FIG. 2, showing in more detail the details of the structure according to a preferred embodiment of the present invention.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.
  • Figure 2 illustrates a concrete mixer shaft end seal structure in accordance with a preferred embodiment of the present invention.
  • 3 is an enlarged view of a portion I of FIG. 2, showing details of a sealing structure in accordance with a preferred embodiment of the present invention in more detail.
  • the shaft end seal structure includes a positioning ring 24, a wear ring 31, a dust cover 32, and a sleeve 23.
  • the oil hole 25 is formed on the positioning ring 24, and the grease is injected in the direction indicated by the arrow, and the positioning ring 24 is fixed to the wear ring 31 connected to the concrete stirring rainbow end wall 30 via bolts.
  • the dust cover 32 is bolted to the sleeve 23 on the concrete mixer main shaft 21 to rotate in synchronization with the main shaft 21.
  • a floating seal bore 26 and a float ring 27 are received in the lubrication chamber to form a floating seal.
  • a meandering first gap 34 is formed between the wear ring 31 and the dust cap 32, and includes a radial portion 342 and an axial portion 341 into which lubricating oil in the lubricating oil chamber can enter. As seen in FIG.
  • an O-ring 28 is disposed between the positioning ring 24 and the wear ring 31 to prevent grease leakage in the lubricating oil chamber, and is further disposed between the sleeve 23 and the positioning ring 24
  • the seal 29 is sealed to prevent external impurities from entering the shaft end seal structure.
  • the shaft end seal structure further includes a seal ring 33 adjacent to the wear ring 31 and the dust cover 32 and disposed between the rainbow wall 30 and the agitating arm 22 fixed to the main shaft 21.
  • a second gap 35 is formed between the seal ring 33 and the main shaft 21, and the second gap 35 communicates with the first gap 34 and is configured such that a labyrinth seal is formed between the seal ring 33 and the main shaft 21.
  • one end of the seal ring 33 adjacent to the main shaft 21 has a stepped cross section, thereby forming a stepped shape between the seal ring and the agitating arm 22.
  • a gap 35 includes a radial portion 351 and an axial portion 352 that communicates with the first gap 34.
  • the agitating arm 22 is disposed close to the shaft end, that is, close to the wear ring 31 and the dust cap 32, thereby forming a first portion between the agitating arm 22 and the cylinder wall 30. Two gaps 35.
  • the second gap may also be formed between the main shaft 21 and the cylinder wall 30 as if the position of the agitating arm was not changed (as described in the prior art of Figure 1). Since the second gap has a stepped shape or other shape capable of forming a labyrinth seal, the mud in the agitating cylinder can be prevented from entering the first gap 34 and entering the lubricating oil chamber via the second gap 35 in the direction of the arrow shown in FIG. , thus ensuring the effectiveness of the shaft end seal structure, ensuring the agitation The safe operation of the mixer increases the service life of the equipment.
  • the radial portion 351 of the second gap 35 extends in the radially outward direction beyond the axial portion 341 of the first gap 34 to better prevent mud from entering the first gap 34.
  • the second gap 35 is shown to exhibit only the shape of one step, it will be understood by those skilled in the art that the second gap 35 can also be formed to have a second level according to the needs of specific operating conditions. Or complex zigzag shapes of multiple steps, or formed into zigzag shapes in the form of other curves.
  • the second gap 35 has a uniform gap width, for example, a gap width of 2 mm. However, the second gap 35 can also have a varying gap width.
  • the shaft end seal structure of the present invention is provided with a seal ring, and a second gap is formed between the seal ring and the main shaft (specifically, the stirring arm), so that a labyrinth seal is formed in the shaft end seal structure,
  • the labyrinth seal and the lubricating oil pressure prevent the mud outflow in the rainbow of the mixer, thereby achieving a better shaft end sealing function, improving the reliability and service life of the equipment.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Accessories For Mixers (AREA)
  • Sealing Devices (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)

Description

轴端密封结构及具有该轴端
密封结构的混凝土搅拌机 技术领域 本发明涉及一种轴端密封结构及具有该轴端密封结构的混凝土搅拌机。 背景技术 搅拌机是混凝土搅拌设备的核心部件。 目前， 搅拌机中水和泥浆的外流 渗漏问题一直是行业内关注的问题， 轻微的泥浆渗漏就会导致轴端的迅速磨 损从而引起相关零部件的失效，影响整个搅拌站的运行和使用。 因此，如何改 善轴端渗漏问题已成为当前的迫切需要。 传统的搅拌机主轴轴端通常釆用图 1所示的密封方式， 如图所示， 在传 统的主轴 1上， 通过设在定位环 6上的润滑油入口定时加注润滑油脂， 油脂 通过油孔 10到达定位环 6与轴套 2之间的空腔， 该空腔与耐磨环 5、 防尘盖 4之间的间隙 11相通， 油脂布满整个间隙 11后， 阻止泥浆的渗出。 轴套 2、 搅拌臂 12安装在轴上， 与轴同步旋转， 浮动密封圏 7与浮动环 8分别安装 在定位环 6和轴套 2上， 浮动密 圏之间通过端面密 †， 从而阻止泥浆从旋 转的轴间渗出。 可以看出， 整个密封结构与搅拌臂 12 隔开一定距离， 且油 脂分布的整个间隙 11与搅拌臂侧的缸体是直接连通的，这样随着主轴的不断 转动及油压的变化， 流动的泥浆可能会直接渗入油路而外流， 最终造成整个 结构失效。 发明内容 为解决上述问题而提出本发明，且本发明提供一种新型的搅拌机主轴的 轴端密封结构， 该密封结构能够防止泥浆直接渗入油路而外流， 由此提高结 构的密封能力和可靠性。 根据本发明的一方面， 提供了一种搅拌机的轴端密封结构， 用于混凝土 搅拌机， 所述轴端密封结构包括： 耐磨环， 连接于所述搅拌机的搅拌虹的虹 壁； 防尘盖， 连接于所述搅拌机的主轴并与所述主轴同步转动， 在所述防尘 盖与所述耐磨环之间形成有第一间隙， 所述第一间隙与润滑油腔连通； 密封 环， 设置在所述虹壁与所述主轴之间， 形成在所述密封环与所述主轴之间的 第二间隙， 所述第二间隙形成迷宫式密封， 所述第二间隙与所述第一间隙相 通。 优选地， 所述密封环的靠近所述主轴的一端具有阶梯形截面， 从而在所 述密 环与所述主轴之间形成阶梯形的第二间隙。 优选地,所述搅拌机的搅拌臂安装在所述主轴上并且靠近所述耐磨环和 所述防尘盖， 所述密封环设置在所述缸壁与所述搅拌臂之间。 优选地 ,所述第二间隙的径向部在径向向外方向上超出所述第一间隙的 轴向部。 优选地， 所述第二间隙的轴向部和径向部具有均匀的间隙宽度。 优选地， 所述间隙宽度为 2mm。 优选地， 所述第二间隙具有多级阶梯形式的曲折形状。 根据本发明的另一方面， 提供了一种混凝土搅拌机 , 其包括具有上述特 征的轴端密封结构。 根据本发明的轴端密封结构，由于在缸体的端壁与搅拌臂之间设置有密 封环， 由此在密封环与搅拌臂之间形成了一种迷宫式密封， 通过该迷宫式密 封以及润滑油压来阻止搅拌机虹体内的泥浆外流以及与润滑油的直接接触， 起到了良好的轴端密封作用， 提高了设备的可靠性和使用寿命。 附图说明 通过以下结合附图的详细描述， 本发明的上述和其它方面、特征和其它 优点将得以更好地理解， 附图中： 图 1示出了现有技术的混凝土搅拌机轴端密封结构； 图 2示出了根据本发明优选实施例的混凝土搅拌机轴端密封结构； 图 3为图 2的 I部放大图， 更详细地示出了根据本发明优选实施例的密 ^"结构的细节。 具体实施方式 下面结合附图， 进一步详细说明本发明的具体实施方式。 然而， 本发明 可以以 4艮多不同形式实施， 不应该被理解为仅限于这里所呈现的实施例。 相 反， 提供了这些实施例， 使得本公开全面而完整， 并全面地将本发明的范围 传达给本领域的技术人员。 附图中， 相同参考标号表示相同元件。 图 2示出了根据本发明优选实施例的混凝土搅拌机轴端密封结构。 图 3 为图 2的 I部放大图， 更详细地示出了根据本发明优选实施例的密封结构的 细节。该轴端密封结构包括有定位环 24、耐磨环 31、 防尘盖 32以及轴套 23。 注油孔 25形成在定位环 24上， 油脂沿箭头所示方向注入， 定位环 24经由 螺栓固定于连接至混凝土搅拌虹端壁 30上的耐磨环 31。 防尘盖 32经由螺栓 连接于混凝土搅拌机主轴 21上的轴套 23 以与主轴 21 同步转动。 浮动密封 圏 26和浮动环 27容纳在润滑油腔中， 以形成浮动密封。 在耐磨环 31与防 尘盖 32之间形成有曲折的第一间隙 34, 其包括径向部 342和轴向部 341 , 润滑油腔中的润滑油可进入该第一间隙 34 中。 如图 2 中看到的， 在定位环 24与耐磨环 31之间设置有 O型环 28以防止润滑油腔中的油脂外漏，并且在 轴套 23与定位环 24之间还设置有密封圏 29 以阻止外部杂质侵入该轴端密 封结构中。 在本发明中， 该轴端密封结构还包括有密封环 33, 该密封环 33靠近耐 磨环 31和防尘盖 32且设置于虹壁 30与固定在主轴 21上的搅拌臂 22之间。 该密封环 33与主轴 21之间形成有第二间隙 35, 该第二间隙 35与第一间隙 34相通并且被构造成使得在密封环 33与主轴 21之间形成迷宫式密封。具体 地， 在该优选实施例中， 如图 3所清楚示出的， 该密封环 33的靠近主轴 21 的一端具有阶梯形截面， 从而在该密封环与搅拌臂 22 之间形成阶梯形的第 二间隙 35, 其包括径向部 351和轴向部 352 , 该第二间隙与第一间隙 34相 通。 如本领域技术人员可以理解的， 在该实施例中， 搅拌臂 22被设置为靠 近轴端， 即靠近耐磨环 31和防尘盖 32, 从而在搅拌臂 22与缸壁 30之间形 成第二间隙 35。 但是， 在适当的情况下， 也可以如不改变搅拌臂的位置（如 附图 1 的现有技术所描述的那样 ), 而在主轴 21与缸壁 30之间形成该第二 间隙。 由于该第二间隙具有阶梯形形状或能够形成迷宫式密封的其他形状， 因此可阻止搅拌缸内的泥浆沿图 3所示箭头方向经由第二间隙 35进入第一 间隙 34 并进入润滑油腔中， 从而确保了轴端密封结构的有效性， 保证了搅 拌机的安全操作， 提高了设备的使用寿命。 在该实施例中， 该第二间隙 35的径向部 351在径向向外方向上延伸超 出第一间隙 34的轴向部 341 , 以更好地阻止泥浆进入第一间隙 34中。 在该 实施例中， 虽然示出了第二间隙 35 仅呈现一级阶梯的形状， 但是本领域技 术人员可以理解， 根据具体操作条件的需要， 也可以将该第二间隙 35 形成 为具有二级或多级阶梯的复杂曲折形状， 或者形成为其他曲线形式的曲折形 状。 在该实施例中， 为了制作方便， 第二间隙 35具有均匀的间隙宽度， 例 如具有 2mm的间隙宽度。但是，该第二间隙 35也可以具有变化的间隙宽度。 居本发明的轴端密封结构， 由于设置有密封环， 并且该密封环与主轴 (具体为搅拌臂） 之间形成有第二间隙， 从而使得在该轴端密封结构中形成 迷宫式密封， 通过该迷宫式密封以及润滑油压来阻止搅拌机虹体内的泥浆外 流， 由此起到了较好的轴端密封作用， 提高了设备的可靠性和使用寿命。 尽管在该优选实施例中示出了该轴端密封结构应用于混凝土搅拌站的 搅拌机中， 但是本领域技术人员可以理解， 该轴端密封结构同样可以应用于 其他需要轴端密封的场合中。 虽然已经结合目前被认为是实用示例性实施例对本发明进行了描述，然 而， 本领域的技术人员可以理解， 本发明不限于所公开的示例性实施例。 凡 在本发明的精神和原则之内， 所作的任何修改、 等同替换、 改进等， 均应包 含在本发明的保护范围之内。

Claims

权 利 要 求 书
1. 一种轴端密封结构， 用于混凝土搅拌机， 其特征在于， 所述轴端密封 结构包括：
耐磨环 （31 ), 连接于所述搅拌机的搅拌缸的缸壁 （30);
防尘盖 （32), 连接于所述搅拌机的主轴 （21 ) 并与所述主轴同 步转动， 在所述防尘盖 （32) 与所述耐磨环 （31 ) 之间形成有第一间 隙 （34), 所述第一间隙 （34) 与润滑油腔连通；
密封环 （33 ), 设置在所述虹壁 （30) 与所述主轴 （21 ) 之间， 在所述密封环 （ 33 )与所述主轴（ 21 )之间形成第二间隙 （ 35 ), 所述 第二间隙 （35 ) 形成迷宫式密封， 所述第二间隙 （35 ) 与所述第一间 隙 （ 34 ) 相通。
2. 居权利要求 1所述的轴端密封结构， 其特征在于， 所述密封环（33) 的靠近所述主轴（21 )的一端具有阶梯形截面，从而在所述密封环（33) 与所述主轴 （ 21 )之间形成阶梯形的第二间隙 （ 35 )。
3. 根据权利要求 1或 2所述的轴端密封结构， 其特征在于， 所述搅拌机 的搅拌臂 （22) 安装在所述主轴 （21 ) 上并且靠近所述耐磨环 （33 ) 和所述防尘盖 （ 32 ), 所述密封环 （ 33 )设置在所述缸壁 （ 30 ) 与所述 搅拌臂 （22) 之间。
4. 根据权利要求 1或 2所述的轴端密封结构， 其特征在于， 所述第二间 隙 （35 ) 的径向部 （351 ) 在径向向外方向上超出所述第一间隙 （34) 的轴向部 ( 341 )„
5. 根据权利要求 4所述的轴端密封结构，其特征在于，所述第二间隙（ 35 ) 的轴向部和径向部具有均匀的间隙宽度。
6. 根据权利要求 5所述的轴端密封结构， 其特征在于， 所述间隙宽度为 2mm。
7. 根据权利要求 2所述的轴端密封结构，其特征在于，所述第二间隙（ 35 ) 具有多级阶梯形式的曲折形状。
8. —种混凝土搅拌机， 其特征在于， 包括权利要求 1-6 中任意一项所述 的轴端密^"结构。
PCT/CN2010/074653 2009-10-22 2010-06-28 轴端密封结构及具有该轴端密封结构的混凝土搅拌机 WO2011047557A1 (zh)

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CN105108901A (zh) * 2015-07-16 2015-12-02 柳州铁道职业技术学院 一种建筑施工用的混凝土搅拌装置
KR101670952B1 (ko) * 2016-05-20 2016-10-31 대명산업(주) 콘크리트 믹서용 실링 장치

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