WO2022111057A1 - Air tightness testing device for wheel hub - Google Patents

Air tightness testing device for wheel hub Download PDF

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Publication number
WO2022111057A1
WO2022111057A1 PCT/CN2021/122339 CN2021122339W WO2022111057A1 WO 2022111057 A1 WO2022111057 A1 WO 2022111057A1 CN 2021122339 W CN2021122339 W CN 2021122339W WO 2022111057 A1 WO2022111057 A1 WO 2022111057A1
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WO
WIPO (PCT)
Prior art keywords
water tank
wheel hub
water
sensing device
air tightness
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Application number
PCT/CN2021/122339
Other languages
French (fr)
Chinese (zh)
Inventor
颜胜元
熊军明
周斌
施康平
吴锦宇
徐晓初
田泽艳
Original Assignee
浙江铂动工贸有限公司
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Application filed by 浙江铂动工贸有限公司 filed Critical 浙江铂动工贸有限公司
Publication of WO2022111057A1 publication Critical patent/WO2022111057A1/en

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00Investigating fluid-tightness of structures
    • G01M3/38Investigating fluid-tightness of structures by using light
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60BVEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B17/00Wheels characterised by rail-engaging elements
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/20Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of weight, e.g. to determine the level of stored liquefied gas
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60BVEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B2360/00Materials; Physical forms thereof
    • B60B2360/10Metallic materials
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60BVEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B2360/00Materials; Physical forms thereof
    • B60B2360/14Physical forms of metallic parts
    • B60B2360/147Castings

Definitions

  • the utility model relates to the field of wheel hub detection, in particular to a wheel hub air tightness detection device.
  • the airtightness of the hub is an important indicator of the performance of the beam hub.
  • the airtightness requirement of the aluminum alloy hub is a must for each piece.
  • the commonly used detection methods are helium gas tightness detection and water gas tightness detection.
  • the utility model provides a wheel hub air tightness detection device, which can effectively solve the problems existing in the above-mentioned traditional wheel hub air tightness detection process, the overall structure is simple, and the work of checking the wheel hub air tightness is greatly improved.
  • a wheel hub air tightness detection device comprising a detection machine, a telescopic arm, a water tank, a motor, a wheel hub, and a clamp, a weight sensing device is arranged at the bottom of the water tank, and the The weight sensing device is used to detect the volume of water in the water tank; the outer surface of the water tank is provided with a first alarm device, and the first alarm device is connected with the weight sensing device; the fixture is provided with liquid A sensing device, the liquid sensing device is used to detect whether the fixture is in contact with water, a second alarm device is provided on the detection machine, and the second alarm device is connected with the liquid sensing device.
  • a glass window is provided on the water tank, and the glass window is used to observe the air tightness of the wheel hub in the water tank.
  • the liquid sensing device is arranged on the upper end face of the clamp to ensure that the wheel hub is completely immersed in water when the water submerges the liquid sensing device.
  • a rotating shaft is provided at the connection between the clamp and the telescopic arm, and the rotating shaft rotates the clamp.
  • the wheel hub on the fixture can be rotated, and the water remaining in the wheel hub can be poured out, so as to prevent the water volume in the water tank from decreasing too quickly.
  • the inner wall of the water tank is provided with a lighting lamp to observe the air tightness of the wheel hub in the water tank. In this way, the situation in the water tank can be observed in time even in the case of poor external light.
  • a weight sensing device is arranged under the water tank and is connected with the first alarm
  • a liquid sensing device is arranged on the upper and lower end surfaces of the fixture to detect whether the wheel hub has completely entered the water
  • a glass window and a lighting lamp are arranged on the water tank.
  • Fig. 1 is the normal working state diagram of the wheel hub of the present invention.
  • FIG. 2 is a working state diagram of the wheel hub of the present invention.
  • a wheel hub air tightness detection device includes a detection machine 1, a telescopic arm 2, a water tank 3, a motor 4, a wheel hub 5, and a fixture 6.
  • the bottom of the water tank 3 is provided with a weight sensing device 7,
  • the weight sensing device 7 is used to detect the volume of water in the water tank 3 ;
  • the outer surface of the water tank 3 is provided with a first alarm device 8 , and the first alarm device 8 is connected to the weight sensing device 7 ;
  • the fixture 6 is provided with a liquid sensing device 9, and the liquid sensing device 9 is used to detect whether the fixture 6 is in contact with water, and the detector 1 is provided with a second alarm device 10, the second The alarm device 10 is connected to the liquid sensing device 9 .
  • the liquid sensing device 9 is provided with two upper end surfaces of the clamp 6 on the left and right sides respectively.
  • the second alarm device 10 can only be disabled after the liquid sensing device 9 is in contact with water at the same time.
  • a glass window 11 is provided on the surface of the water tank 3, and an illumination lamp 13 is provided on the inner wall of the water tank 3.
  • an illumination lamp 13 is provided on the inner wall of the water tank 3.
  • the fixture 6 A rotating shaft 12 is further arranged between the telescopic arm 2 and the rotating shaft 12 , the rotating shaft 12 can rotate the wheel hub 5 by 90°, and the wheel hub 5 re-pours the internal water into the water tank 3 .
  • the clamp 6 is driven by the motor 4 to clamp the wheel hub 5 , and the motor 4 drives the telescopic arm 2 to slowly put the wheel hub 5 into the water tank 3 .
  • the second alarm device 10 located on the detector 1 works normally and no alarm occurs.
  • the weight sensing device 7 under the water tank 3 detects that the volume of water is less than the minimum water volume for immersing the wheel hub 5 , the first alarm 6 generates an alarm.

Abstract

An air tightness testing device for a wheel hub, the air tightness testing device comprising a testing machine (1), a telescopic arm (2), a water tank (3), an electric motor (4), a wheel hub (5) and a clamp (6), wherein a weight sensing device (7) is arranged at the bottom of the water tank (3), and the weight sensing device (7) is used for measuring the volume of water in the water tank (3); a first alarm device (8) is arranged on an outer surface of the water tank (3), and the first alarm device (8) is connected to the weight sensing device (7); liquid sensing devices (9) are arranged on the clamp (6), and the liquid sensing devices (9) are used for detecting whether the clamp (6) comes into contact with the water; and a second alarm device (10) is arranged on the testing machine (1), and the second alarm device (10) is connected to the liquid sensing device (9). The weight sensing device (7) is arranged below the water tank (3) and connected to the first alarm device (8), and the liquid sensing devices (9) are arranged on the upper and lower end faces of the clamp (6) to detect whether the wheel hub (5) is completely submerged in water, such that the device has a simple overall structure, the working efficiency of testing the air tightness of the wheel hub (5) is improved, and incomplete immersion of the wheel hub (5) due to insufficient water in the water tank (3) is avoided.

Description

一种轮毂气密性检测装置A wheel hub air tightness detection device 技术领域technical field
本实用新型涉及轮毂检测领域,尤其是涉及一种轮毂气密性检测装置。The utility model relates to the field of wheel hub detection, in particular to a wheel hub air tightness detection device.
背景技术Background technique
轮毂的气密性是横梁轮毂性能的一项重要指标,在轮毂生产企业,对铝合金轮毂气密性要求是每件必检。通常采用的检测方法有氦气密检测和水气密检测。The airtightness of the hub is an important indicator of the performance of the beam hub. In the hub production enterprise, the airtightness requirement of the aluminum alloy hub is a must for each piece. The commonly used detection methods are helium gas tightness detection and water gas tightness detection.
技术问题technical problem
在进行水气密性检测的过程中,由于会需要反复进行将不同的轮毂放入水箱中进行轮毂气密性检测,在拿出轮毂的时候难免会将水箱中的水带出来,持续操作会导致水箱中的水减少的速度大大增加,水箱干涸需要及时对水箱进行补水,且需要人为去估量水量的情况,效率低下,设计出一种能够及时针对水箱中水量检测并做出警报的装置是非常有必要的。In the process of water-tightness testing, since it will be necessary to repeatedly put different hubs into the water tank to test the air-tightness of the hub, it is inevitable that the water in the water tank will be taken out when the wheel is taken out, and continuous operation will The rate of water reduction in the water tank is greatly increased. When the water tank is dry, it is necessary to replenish the water tank in time, and it is necessary to manually measure the water volume, which is inefficient. Designing a device that can detect and alert the water volume in the water tank in time is very necessary.
技术解决方案technical solutions
针对现有技术的不足,本实用新型提供一种轮毂气密性检测装置,能够有效解决上述传统轮毂气密性检测过程中存在的问题,整体结构简单,大大提高了检查轮毂气密性的工作效率,对水箱中的水量进行实时检测并第一时间发出警报,操作方便快捷,省时省力,避免因水箱中水量不够而不能使轮毂完全沉浸。In view of the deficiencies of the prior art, the utility model provides a wheel hub air tightness detection device, which can effectively solve the problems existing in the above-mentioned traditional wheel hub air tightness detection process, the overall structure is simple, and the work of checking the wheel hub air tightness is greatly improved. Efficiency, real-time detection of the water volume in the water tank and an alarm at the first time, the operation is convenient and fast, saving time and effort, and avoiding the complete immersion of the hub due to insufficient water in the water tank.
本实用新型解决其技术问题所采用的技术方案是:一种轮毂气密性检测装置,包括检测机、伸缩臂、水箱、电机、轮毂、夹具,所述水箱底部设置有重量感应装置,所述重量感应装置用于检测所述水箱内水的体积大小;所述水箱的外侧表面设置有第一警报装置,所述第一警报装置与所述重量感应装置相连接;所述夹具上设置有液体感应装置,所述液体感应装置用于检测所述夹具是否与水相接触,所述检测机上设置有第二警报装置,所述第二警报装置与所述液体感应装置相连接。The technical scheme adopted by the utility model to solve the technical problem is as follows: a wheel hub air tightness detection device, comprising a detection machine, a telescopic arm, a water tank, a motor, a wheel hub, and a clamp, a weight sensing device is arranged at the bottom of the water tank, and the The weight sensing device is used to detect the volume of water in the water tank; the outer surface of the water tank is provided with a first alarm device, and the first alarm device is connected with the weight sensing device; the fixture is provided with liquid A sensing device, the liquid sensing device is used to detect whether the fixture is in contact with water, a second alarm device is provided on the detection machine, and the second alarm device is connected with the liquid sensing device.
上述技术方案中,进一步地,所述水箱上还设置有玻璃窗,所述玻璃窗用于观察所述水箱内的所述轮毂气密性情况。这样设置,使用者通过玻璃窗即可观察加入的水量情况以及轮毂气密性情况。In the above technical solution, further, a glass window is provided on the water tank, and the glass window is used to observe the air tightness of the wheel hub in the water tank. With this arrangement, the user can observe the amount of water added and the air tightness of the wheel hub through the glass window.
上述技术方案中,进一步地,所述液体感应装置设置在所述夹具的上端面,保证水没过所述液体感应装置时,所述轮毂为完全浸入水中的状态。In the above technical solution, further, the liquid sensing device is arranged on the upper end face of the clamp to ensure that the wheel hub is completely immersed in water when the water submerges the liquid sensing device.
上述技术方案中,进一步地,所述夹具与所述伸缩臂连接处还设置有转轴,所述转轴将所述夹具进行转动。这样设置,可将夹具上的轮毂进行转动,将残留在轮毂内的水倾倒出来,避免水箱中的水量减少的过快。In the above technical solution, further, a rotating shaft is provided at the connection between the clamp and the telescopic arm, and the rotating shaft rotates the clamp. In this way, the wheel hub on the fixture can be rotated, and the water remaining in the wheel hub can be poured out, so as to prevent the water volume in the water tank from decreasing too quickly.
上述技术方案中,进一步地,所述水箱的内壁设置有照明灯,观察所述轮毂在所述水箱中的气密性状况。这样设置,在外界光线不佳的情况也能及时观察水箱中的情况。In the above technical solution, further, the inner wall of the water tank is provided with a lighting lamp to observe the air tightness of the wheel hub in the water tank. In this way, the situation in the water tank can be observed in time even in the case of poor external light.
有益效果beneficial effect
本实用新型的有益效果是:通过在水箱下设置重量感应装置并与第一警报器连接,通过在夹具上下端面设置液体感应装置检测轮毂是否完全进入水中,通过在水箱上设置玻璃窗和照明灯来更好的观察水箱中的具体情况,整体结构简单,大大提高了检查轮毂气密性的工作效率,对水箱中的水量进行实时检测并第一时间发出警报,操作方便快捷,省时省力,避免因水箱中水量不够而不能使轮毂完全沉浸。The beneficial effects of the utility model are as follows: a weight sensing device is arranged under the water tank and is connected with the first alarm, a liquid sensing device is arranged on the upper and lower end surfaces of the fixture to detect whether the wheel hub has completely entered the water, and a glass window and a lighting lamp are arranged on the water tank. To better observe the specific situation in the water tank, the overall structure is simple, which greatly improves the work efficiency of checking the air tightness of the wheel hub. Avoid fully immersing the hub due to insufficient water in the tank.
附图说明Description of drawings
下面结合附图和实施例对本实用新型进一步说明。The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.
图1是本实用新型的轮毂正常工作状态图。Fig. 1 is the normal working state diagram of the wheel hub of the present invention.
图2是本实用新型的轮毂转动工作状态图。FIG. 2 is a working state diagram of the wheel hub of the present invention.
图中,1.检测机,2.伸缩臂,3.水箱,4.电机,5.轮毂,6.夹具,7.重量感应装置,8.第一警报装置,9.液体感应装置,10.第二警报器,11.玻璃窗,12.转轴,13.照明灯。In the figure, 1. Detector, 2. Telescopic arm, 3. Water tank, 4. Motor, 5. Wheel hub, 6. Clamp, 7. Weight sensing device, 8. First alarm device, 9. Liquid sensing device, 10. The second alarm, 11. glass window, 12. shaft, 13. lighting.
本发明的最佳实施方式BEST MODE FOR CARRYING OUT THE INVENTION
参照图1-2所示,一种轮毂气密性检测装置,包括检测机1、伸缩臂2、水箱3、电机4、轮毂5、夹具6,所述水箱3底部设置有重量感应装置7,所述重量感应装置7用于检测所述水箱3内水的体积大小;所述水箱3的外侧表面设置有第一警报装置8,所述第一警报装置8与所述重量感应装置7相连接;所述夹具6上设置有液体感应装置9,所述液体感应装置9用于检测所述夹具6是否与水相接触,所述检测机1上设置有第二警报装置10,所述第二警报装置10与所述液体感应装置9相连接。Referring to Figures 1-2, a wheel hub air tightness detection device includes a detection machine 1, a telescopic arm 2, a water tank 3, a motor 4, a wheel hub 5, and a fixture 6. The bottom of the water tank 3 is provided with a weight sensing device 7, The weight sensing device 7 is used to detect the volume of water in the water tank 3 ; the outer surface of the water tank 3 is provided with a first alarm device 8 , and the first alarm device 8 is connected to the weight sensing device 7 ; The fixture 6 is provided with a liquid sensing device 9, and the liquid sensing device 9 is used to detect whether the fixture 6 is in contact with water, and the detector 1 is provided with a second alarm device 10, the second The alarm device 10 is connected to the liquid sensing device 9 .
为了防止因所述轮毂5倾斜而不能检测出是否整体完全浸入水中,所述液体感应装置9设置有两个并分别设置在左右两侧的所述夹具6上端面,当两处上端面的所述液体感应装置9同时接触到水后才能使所述第二警报装置10不工作。In order to prevent the inclination of the hub 5 from being able to detect whether the whole is completely immersed in water, the liquid sensing device 9 is provided with two upper end surfaces of the clamp 6 on the left and right sides respectively. The second alarm device 10 can only be disabled after the liquid sensing device 9 is in contact with water at the same time.
为了更加方便的观察所述轮毂5的气密性是否合格,在所述水箱3表面设置有玻璃窗11,所述水箱3的内壁设置有照明灯13,通过所述玻璃窗11和所述照明灯13的配合,不仅能够更加清楚的观察到所述轮毂5的检验情况,还能防止因外界光线过暗导致误判,使得所述轮毂5的生产效率提高。In order to more conveniently observe whether the airtightness of the hub 5 is qualified, a glass window 11 is provided on the surface of the water tank 3, and an illumination lamp 13 is provided on the inner wall of the water tank 3. Through the glass window 11 and the illumination The cooperation of the lamps 13 can not only observe the inspection situation of the hub 5 more clearly, but also prevent misjudgment caused by too dark outside light, so that the production efficiency of the hub 5 is improved.
因为所述轮毂5内部设计有不同大小的凹槽,当所述轮毂5从所述水箱3中抽离出来后,所述轮毂5内部存储有部分水量,为了减少水的浪费,所述夹具6和所述伸缩臂2之间还设置有转轴12,所述转轴12可以使所述轮毂5转动90°,所述轮毂5将内部的水重新倒入至所述水箱3中。Because the inside of the hub 5 is designed with grooves of different sizes, when the hub 5 is pulled out from the water tank 3, a portion of the water is stored inside the hub 5. In order to reduce the waste of water, the fixture 6 A rotating shaft 12 is further arranged between the telescopic arm 2 and the rotating shaft 12 , the rotating shaft 12 can rotate the wheel hub 5 by 90°, and the wheel hub 5 re-pours the internal water into the water tank 3 .
本实用新型的工作流程:所述夹具6通过所述电机4驱动将所述轮毂5夹紧,所述电机4驱动所述伸缩臂2将所述轮毂5缓慢放入至所述水箱3内。The working process of the present invention: the clamp 6 is driven by the motor 4 to clamp the wheel hub 5 , and the motor 4 drives the telescopic arm 2 to slowly put the wheel hub 5 into the water tank 3 .
所述夹具6的上端面的所述液体感应装置9浸入至水中后,位于所述检测机1上的所述第二警报装置10为正常工作,不发生警报。当所述水箱3下的所述重量感应装置7检测出水的体积小于完成沉浸所述轮毂5的最低水量时,所述第一警报器6发生警报。After the liquid sensing device 9 on the upper end surface of the fixture 6 is immersed in water, the second alarm device 10 located on the detector 1 works normally and no alarm occurs. When the weight sensing device 7 under the water tank 3 detects that the volume of water is less than the minimum water volume for immersing the wheel hub 5 , the first alarm 6 generates an alarm.
以上所述,只是本实用新型的一个实施例,并非对本实用新型作出任何形式上的限制,在不脱离本实用新型的技术方案基础上,所作出的简单修改、等同变化或修饰,均落入本实用新型的保护范围。The above is only an embodiment of the present invention, and is not intended to limit the present invention in any form. On the basis of not departing from the technical solution of the present invention, any simple modifications, equivalent changes or modifications made all fall within the scope of the present invention. The scope of protection of the utility model.

Claims (5)

  1. 一种轮毂气密性检测装置,包括检测机(1)、伸缩臂(2)、水箱(3)、电机(4)、轮毂(5)、夹具(6),其特征在于:所述水箱(3)底部设置有重量感应装置(7),所述重量感应装置(7)用于检测所述水箱(3)内水的体积大小;所述水箱(3)的外侧表面设置有第一警报装置(8),所述第一警报装置(8)与所述重量感应装置(7)相连接;所述夹具(6)上设置有液体感应装置(9),所述液体感应装置(9)用于检测所述夹具(6)是否与水相接触,所述检测机(1)上设置有第二警报装置(10),所述第二警报装置(10)与所述液体感应装置(9)相连接。A wheel hub air tightness detection device, comprising a detection machine (1), a telescopic arm (2), a water tank (3), a motor (4), a wheel hub (5), and a clamp (6), characterized in that: the water tank ( 3) A weight sensing device (7) is provided at the bottom, and the weight sensing device (7) is used to detect the volume of the water in the water tank (3); the outer surface of the water tank (3) is provided with a first alarm device (8), the first alarm device (8) is connected with the weight sensing device (7); the clamp (6) is provided with a liquid sensing device (9), the liquid sensing device (9) is used for In order to detect whether the fixture (6) is in contact with water, the detection machine (1) is provided with a second alarm device (10), the second alarm device (10) and the liquid sensing device (9) connected.
  2. 根据权利要求1所述的一种轮毂气密性检测装置,其特征在于:所述水箱(3)上还设置有玻璃窗(11),所述玻璃窗(11)用于观察所述水箱(3)内的所述轮毂(5)气密性情况。A wheel hub air tightness detection device according to claim 1, characterized in that: the water tank (3) is further provided with a glass window (11), and the glass window (11) is used to observe the water tank (3). 3) Air tightness of the hub (5) inside.
  3. 根据权利要求1所述的一种轮毂气密性检测装置,其特征在于:所述液体感应装置(9)设置在所述夹具(6)的上端面,保证水没过所述液体感应装置(9)时,所述轮毂(5)为完全浸入水中的状态。A wheel hub air tightness detection device according to claim 1, characterized in that: the liquid sensing device (9) is arranged on the upper end face of the clamp (6) to ensure that water does not pass the liquid sensing device (9). ), the hub (5) is completely immersed in water.
  4. 根据权利要求3所述的一种轮毂气密性检测装置,其特征在于:所述夹具(6)与所述伸缩臂(2)连接处还设置有转轴(12),所述转轴(12)将所述夹具(6)进行转动。A wheel hub air tightness detection device according to claim 3, characterized in that: a rotating shaft (12) is further provided at the connection between the clamp (6) and the telescopic arm (2), and the rotating shaft (12) Rotate the clamp (6).
  5. 根据权利要求1所述的一种轮毂气密性检测装置,其特征在于:所述水箱(3)的内壁设置有照明灯(13),观察所述轮毂(5)在所述水箱(3)中的气密性状况。A wheel hub air tightness detection device according to claim 1, characterized in that: the inner wall of the water tank (3) is provided with a lighting lamp (13) to observe the wheel hub (5) in the water tank (3) air tightness condition.
PCT/CN2021/122339 2020-11-27 2021-09-30 Air tightness testing device for wheel hub WO2022111057A1 (en)

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Publication number Priority date Publication date Assignee Title
CN214040499U (en) * 2020-11-27 2021-08-24 浙江铂动工贸有限公司 Hub air tightness detection device
CN114720058B (en) * 2022-03-29 2024-03-22 浙江万丰摩轮有限公司 Variable speed type electric motor shell cavity gas tightness testing arrangement
CN115060423B (en) * 2022-06-20 2024-01-26 连城凯克斯科技有限公司 Tightness detection device for silicon carbide production equipment

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CN206683824U (en) * 2017-04-18 2017-11-28 广元市安驭铝合金车轮有限公司 Wheel hub gas tightness testing machine
CN209567926U (en) * 2018-09-21 2019-11-01 深圳市源远水利设计有限公司 A kind of water-level instrumentation with sewage treatment function
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ITPD910113A1 (en) * 1991-06-21 1992-12-21 Borli Srl AIR TIGHTNESS TEST MACHINE ON WHEEL RIMS OBTAINED BY CASTING.
DE20216485U1 (en) * 2002-10-24 2003-02-13 Ilmvac Gmbh Wheel hub pressure test rig has conical interface with bellows height adjustment
CN104067065A (en) * 2011-04-05 2014-09-24 盖伊·高南 Water level measurement device using load cell
CN206683824U (en) * 2017-04-18 2017-11-28 广元市安驭铝合金车轮有限公司 Wheel hub gas tightness testing machine
CN107063386A (en) * 2017-06-09 2017-08-18 深圳市能点科技有限公司 A kind of passive type liquid level emasuring device
CN209567926U (en) * 2018-09-21 2019-11-01 深圳市源远水利设计有限公司 A kind of water-level instrumentation with sewage treatment function
CN214040499U (en) * 2020-11-27 2021-08-24 浙江铂动工贸有限公司 Hub air tightness detection device

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