WO2006114048A1 - A cushion mehanism in a hydraulic piston cylinder - Google Patents

A cushion mehanism in a hydraulic piston cylinder Download PDF

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Publication number
WO2006114048A1
WO2006114048A1 PCT/CN2006/000773 CN2006000773W WO2006114048A1 WO 2006114048 A1 WO2006114048 A1 WO 2006114048A1 CN 2006000773 W CN2006000773 W CN 2006000773W WO 2006114048 A1 WO2006114048 A1 WO 2006114048A1
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WIPO (PCT)
Prior art keywords
buffer
cushion
cylinder
column
oil
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PCT/CN2006/000773
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French (fr)
Chinese (zh)
Inventor
Yangdong He
Original Assignee
Yangdong He
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Publication of WO2006114048A1 publication Critical patent/WO2006114048A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • F15B15/222—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having a piston with a piston extension or piston recess which throttles the main fluid outlet as the piston approaches its end position

Definitions

  • the present invention relates to a hydraulic ram cylinder damping device for a concrete pump.
  • the plunger cylinder of the concrete pump hydraulic system completes the driving function of the concrete distribution valve in the concrete pump, with fast action speed, large hydraulic flow and high pressure. If there is no effective and reliable buffering, it will cause serious impact and noise, and even cause corresponding machine failure.
  • the existing hydraulic plunger cylinder buffer device is composed of a buffer oil chamber at the bottom of the plunger and a buffer column of the oil cylinder, and a small hole is connected from the bottom of the buffer oil chamber to the outer surface of the plunger in the radial direction;
  • the group buffer device is installed in the buffer oil chamber at the bottom of the plunger, and the buffer piston is communicated with the small holes at both ends.
  • the buffer function is realized by the fixed liquid resistance, which often causes the plunger cylinder to decelerate and the peak pressure shock of the distribution valve oil passage.
  • the buffering effect is often poor, and even the cylinder is stuck and locked. The above defects adversely affect the operational reliability of the concrete pump and increase the manufacturing and maintenance costs of the product.
  • the technical problem to be solved by the present invention is to provide an improved hydraulic ram cylinder buffer device for the defects of the prior art, which can enhance the buffer function by automatically increasing the liquid resistance during the buffering process to ensure the buffering effect; At the same time, the mating surface of the buffer oil chamber and the buffer column is ensured to have a uniform gap and sufficient lubrication to reduce wear. Moreover, the device can effectively overcome the deficiencies of the existing buffer device, improve the reliability of the use of the plunger cylinder, and reduce the cost of manufacturing and maintenance.
  • the technical solution of the present invention is to provide a hydraulic ram cylinder buffer device, which is composed of a cylinder 2 and a plunger 1 inserted into the inner cavity of the cylinder 2, wherein the coaxial line on the bottom surface of the inner cavity of the cylinder 2 is provided.
  • a buffer column 21 There is a buffer column 21, and the coaxial line on the plunger 1 corresponding to the buffer column 21 is provided with a buffer oil chamber 11 matching the size of the buffer column 21.
  • the technical feature is that an oil groove 12 is disposed on the inner surface of the buffer oil chamber 11 in the axial direction.
  • the oil groove 12 has a spiral structure, and the oil groove 12 extends from the cavity bottom 13 of the buffer oil chamber 11 to the cavity 14.
  • the cylindrical surface of the buffer column 21 may also be distributed with oil grooves 22 in the axial direction.
  • the oil grooves 22 also have a spiral structure, and the oil grooves 22 extend from the column bottom 23 of the buffer column 21 to the column top 24.
  • the buffer oil chamber 11 of the hydraulic plunger cylinder buffer device for a concrete pump of the present invention is at the bottom of the plunger 1 facing the end of the cylinder 2, and the inner surface thereof is along
  • An oil groove 12 extends from the cavity bottom 13 of the buffer oil chamber 11 to the cavity 14 in the axial direction;
  • the buffer column 21 of the buffer device is on the oil cylinder 2, and the outer surface thereof also has an oil groove 22 extending from the column bottom 23 of the buffer column 21 in the axial direction. To the top of the column 24.
  • the oil groove ensures that the mating surface of the buffer oil chamber and the buffer column is evenly spaced and fully lubricated to reduce wear.
  • the deceleration is smooth and continuous, and the pressure shock is small, which makes the plunger cylinder work in a more ideal state.
  • the beneficial effects of the present invention are that the above characteristics of the shock absorbing device enable the hydraulic ram cylinder system to Effectively overcome the deficiencies of the existing buffer device, the reliability and working performance of the plunger cylinder are effectively improved and enhanced, and thus the manufacturing and service costs are reduced.
  • FIG. 1 is a schematic structural view of a hydraulic ram cylinder buffer device of the present invention.
  • the figure is marked as: 1 a plunger
  • a cylinder 2 having a diameter of 080 ram and a plunger 1 which is inserted into the inner cavity of the cylinder 2 and whose size is matched with the inner cavity of the cylinder 2.
  • a buffer column 21 having a diameter of 040 is disposed on the coaxial line on the bottom surface of the inner cavity of the cylinder 2, and a buffer oil chamber 11 matching the size of the buffer column 21 is disposed on the coaxial line of the plunger 1 corresponding to the buffer column 21.
  • a spiral oil groove 12 having a groove diameter of R1mm is disposed on the inner surface of the buffer oil chamber 11 in the axial direction, and the oil groove 12 extends from the cavity bottom 13 of the buffer oil chamber 11 to the cavity port 14, and the cylindrical surface of the buffer column 21 is also along the axis.
  • the direction is distributed with an oil groove 22 having a groove diameter of Rlmra, and the oil groove 22 is from The column bottom 23 of the buffer column 21 extends to the column top 24.
  • the hydraulic ram cylinder buffer device for a concrete pump of the present invention thus constructed has been proven to have a good effect and fully meets the design requirements.
  • the sample buffer device is tested, it can be seen that when the plunger quickly rushes to the bottom of the cylinder, the buffer column enters the buffer oil chamber, and the pressure oil in the chamber overflows from the oil groove and the matching gap, and the plunger starts and completes the buffer deceleration process.
  • the buffering capacity of the device increases with the depth of the plunger entering the buffer oil chamber, and the structure is simple, the work is reliable, and the buffer damping effect is good.

Abstract

A cushion mehanism in a hydraulic piston cylinder is composed of a cylinder 2 and a piston 1. A cushion column 21 is fitted to the bottom of the cylinder 2, an oil cushion chamber 11 is formed in the piston 1, an oil groove 12 is formed in the inner periphery surface of the cushion chamber 11, another oil groove 22 is formed in the outer periphery surface of the cushion column 21. When the cushion mehanism is operated, the piston rapidly rushes into the bottom of the cylinder, so the cushion column goes into the cushion chamber, the pressured oil in the chamber are squeezed out of the two oil grooves and the fit clearance, therefor the piston is decelerated until the cushion is completed. The cushion ability is increased with the increase of the deep the piston goes into the cushion chamber. This mechanism has a simple construction, a good cushion effect and works reliably.

Description

一种液压柱塞油缸缓冲装置  Hydraulic plunger cylinder buffer device
技术领域 Technical field
本发明涉及一种用于混凝土泵的液压柱塞油缸缓冲装置。  The present invention relates to a hydraulic ram cylinder damping device for a concrete pump.
背景技术 Background technique
混凝土泵液压系统的柱塞油缸在混凝土泵中完成对混凝土分配阀 的驱动功能， 动作速度快、液压流量大、压力高。若无有效可靠的缓冲， 将产生严重的冲击和噪声， 甚至引发相应的机器故障。现有的液压柱塞 油缸缓冲装置， 一种由柱塞底部的缓冲油腔和油缸的缓冲柱构成， 从缓 冲油腔底部沿径向至柱塞外表面有小孔联通；还有一种是将一组缓冲装 置装入柱塞底部的缓冲油腔内， 其缓冲活塞两端以小孔联通。缓冲过程 中， 均依靠固定液阻实现缓冲功能， 这样往往会导致柱塞油缸减速冲击 过大和分配阀油路的尖峰压力冲击。当缓冲油腔和缓冲柱的装配间隙与 固定液阻匹配不好时， 常出现缓冲效果不好， 甚至撞缸、 抱死的现象。 上述缺陷对混凝土泵的工作可靠性产生不利影响，并增加了产品的制造 和维护成本。  The plunger cylinder of the concrete pump hydraulic system completes the driving function of the concrete distribution valve in the concrete pump, with fast action speed, large hydraulic flow and high pressure. If there is no effective and reliable buffering, it will cause serious impact and noise, and even cause corresponding machine failure. The existing hydraulic plunger cylinder buffer device is composed of a buffer oil chamber at the bottom of the plunger and a buffer column of the oil cylinder, and a small hole is connected from the bottom of the buffer oil chamber to the outer surface of the plunger in the radial direction; The group buffer device is installed in the buffer oil chamber at the bottom of the plunger, and the buffer piston is communicated with the small holes at both ends. In the buffering process, the buffer function is realized by the fixed liquid resistance, which often causes the plunger cylinder to decelerate and the peak pressure shock of the distribution valve oil passage. When the assembly gap between the buffer oil chamber and the buffer column is not well matched with the fixed liquid resistance, the buffering effect is often poor, and even the cylinder is stuck and locked. The above defects adversely affect the operational reliability of the concrete pump and increase the manufacturing and maintenance costs of the product.
发明内容 Summary of the invention
本发明要解决的技术问题是， 针对现有技术存在的缺陷， 提供一种 改进的液压柱塞油缸缓冲装置，该装置能在缓冲过程中通过自动增加液 阻来增强缓冲功能， 保证缓冲效果； 同时保障缓冲油腔和缓冲柱的配合 面间隙均匀、 润滑充分， 降低磨损。 且该装置还能有效地克服现有缓冲 装置的不足， 提高柱塞油缸使用的可靠性， 降低制造和维护的成本。 本发明的技术解决方案是， 提供一种液压柱塞油缸缓冲装置， 参见 图 1， 该装置由油缸 2和插入油缸 2内腔的柱塞 1组成， 其中油缸 2内 腔底面上同轴线设置有一缓冲柱 21， 而对应缓冲柱 21的所述柱塞 1上 同轴线设置有与缓冲柱 21大小匹配的缓冲油腔 11。 其技术特点是， 所 述缓冲油腔 11的内表面上沿轴线方向分布有油槽 12，所述油槽 12呈螺 旋式结构， 该油槽 12从缓冲油腔 11的腔底 13延伸至腔口 14。 The technical problem to be solved by the present invention is to provide an improved hydraulic ram cylinder buffer device for the defects of the prior art, which can enhance the buffer function by automatically increasing the liquid resistance during the buffering process to ensure the buffering effect; At the same time, the mating surface of the buffer oil chamber and the buffer column is ensured to have a uniform gap and sufficient lubrication to reduce wear. Moreover, the device can effectively overcome the deficiencies of the existing buffer device, improve the reliability of the use of the plunger cylinder, and reduce the cost of manufacturing and maintenance. The technical solution of the present invention is to provide a hydraulic ram cylinder buffer device, which is composed of a cylinder 2 and a plunger 1 inserted into the inner cavity of the cylinder 2, wherein the coaxial line on the bottom surface of the inner cavity of the cylinder 2 is provided. There is a buffer column 21, and the coaxial line on the plunger 1 corresponding to the buffer column 21 is provided with a buffer oil chamber 11 matching the size of the buffer column 21. The technical feature is that an oil groove 12 is disposed on the inner surface of the buffer oil chamber 11 in the axial direction. The oil groove 12 has a spiral structure, and the oil groove 12 extends from the cavity bottom 13 of the buffer oil chamber 11 to the cavity 14.
上述缓冲柱 21的柱面也可以沿轴线方向分布油槽 22,所述油槽 22 也呈螺旋式结构， 该油槽 22从缓冲柱 21的柱底 23延伸至柱顶 24。  The cylindrical surface of the buffer column 21 may also be distributed with oil grooves 22 in the axial direction. The oil grooves 22 also have a spiral structure, and the oil grooves 22 extend from the column bottom 23 of the buffer column 21 to the column top 24.
本发明的工作原理是， 参见图 1 , 从图 1可以看到， 本发明的混凝 土泵用液压柱塞油缸缓冲装置的缓冲油腔 11在柱塞 1朝向油缸 2—端 的底部， 其内表面沿轴线方向有油槽 12从缓冲油腔 11的腔底 13延伸 至腔口 14; 缓冲装置的缓冲柱 21在油缸 2上， 其外表面亦沿轴线方向 有油槽 22从缓冲柱 21的柱底 23延伸至柱顶 24。 当柱塞 1在外力作用 下快速冲向油缸并进入缓冲区， 缓冲柱 21开始进入缓冲油腔 11时， 缓 冲油腔 11内的液压油受到挤压，压力升高并开始通过油槽 12或油槽 22 以及环腔间隙溢出， 油槽 12或油槽 22开始执行可变液阻功能， 并保持 间隙均匀； 缓冲柱 21进入缓冲油腔 11的深度增加， 油槽 12或油槽 22 起液阻作用的长度随之增加， 使液阻增大， 缓冲功能增强； 在柱塞 1进 至油缸 2底部时， 液阻达到最大值。 与此同时， 油槽保障缓冲油腔和缓 冲柱的配合面间隙均匀、 润滑充分， 降低磨损。 且缓冲过程中， 减速平 稳、 连续， 压力冲击小， 可使柱塞油缸在更理想的状态下工作。  The working principle of the present invention is as shown in Fig. 1. As can be seen from Fig. 1, the buffer oil chamber 11 of the hydraulic plunger cylinder buffer device for a concrete pump of the present invention is at the bottom of the plunger 1 facing the end of the cylinder 2, and the inner surface thereof is along An oil groove 12 extends from the cavity bottom 13 of the buffer oil chamber 11 to the cavity 14 in the axial direction; the buffer column 21 of the buffer device is on the oil cylinder 2, and the outer surface thereof also has an oil groove 22 extending from the column bottom 23 of the buffer column 21 in the axial direction. To the top of the column 24. When the plunger 1 quickly rushes toward the cylinder under the external force and enters the buffer zone, when the buffer column 21 starts to enter the buffer oil chamber 11, the hydraulic oil in the buffer oil chamber 11 is squeezed, the pressure rises and starts to pass through the oil groove 12 or the oil groove. 22 and the gap of the annular cavity overflows, the oil groove 12 or the oil groove 22 starts to perform the variable liquid resistance function, and maintains the gap evenly; the depth of the buffer column 21 entering the buffer oil chamber 11 increases, and the length of the oil groove 12 or the oil groove 22 acts as a liquid resistance Increase, the liquid resistance increases, and the buffer function is enhanced; when the plunger 1 enters the bottom of the cylinder 2, the liquid resistance reaches a maximum value. At the same time, the oil groove ensures that the mating surface of the buffer oil chamber and the buffer column is evenly spaced and fully lubricated to reduce wear. During the buffering process, the deceleration is smooth and continuous, and the pressure shock is small, which makes the plunger cylinder work in a more ideal state.
本发明的有益效果是，缓冲装置的上述特性使液压柱塞油缸系统能 有效地克服现有缓冲装置的不足，使柱塞油缸使用的可靠性和工作性能 均得到有效的提高和增强， 并因此降低了制造和服务的成本。 The beneficial effects of the present invention are that the above characteristics of the shock absorbing device enable the hydraulic ram cylinder system to Effectively overcome the deficiencies of the existing buffer device, the reliability and working performance of the plunger cylinder are effectively improved and enhanced, and thus the manufacturing and service costs are reduced.
附图说明 DRAWINGS
图 1是本发明的液压柱塞油缸缓冲装置结构示意图。  1 is a schematic structural view of a hydraulic ram cylinder buffer device of the present invention.
图中标记为： 1一柱塞，  The figure is marked as: 1 a plunger,
11一缓冲油腔，  11 a buffer oil chamber,
12—油槽 12，  12—oil tank 12,
13—腔底，  13—the bottom of the cavity,
14—腔口，  14—cavity,
2—油缸，  2—cylinder,
21—缓冲柱，  21—buffer column,
22—油槽，  22—oil tank,
23—柱底，  23—the bottom of the column,
24—柱顶。  24—The top of the column.
具体实施方式 detailed description
按照图 1和上述结构的本发明之一种液压柱塞油缸缓冲装置的实施 例，有口径为 080ram的油缸 2和插入油缸 2内腔其尺寸与油缸 2内腔尺 寸匹配的柱塞 1。油缸 2内腔底面上同轴线设置直径为 040画的缓冲柱 21，对应缓冲柱 21的柱塞 1上同轴线设置与缓冲柱 21大小匹配的缓冲 油腔 11。缓冲油腔 11的内表面上沿轴线方向分布槽径为 Rlmm的螺旋式 油槽 12， 该油槽 12从缓冲油腔 11的腔底 13延伸至腔口 14, 上述缓冲 柱 21的柱面亦沿轴线方向分布有槽径为 Rlmra的油槽 22， 该油槽 22从 缓冲柱 21的柱底 23延伸至柱顶 24。 According to an embodiment of the hydraulic ram cylinder cushioning device of the present invention constructed as shown in Fig. 1 and above, there is a cylinder 2 having a diameter of 080 ram and a plunger 1 which is inserted into the inner cavity of the cylinder 2 and whose size is matched with the inner cavity of the cylinder 2. A buffer column 21 having a diameter of 040 is disposed on the coaxial line on the bottom surface of the inner cavity of the cylinder 2, and a buffer oil chamber 11 matching the size of the buffer column 21 is disposed on the coaxial line of the plunger 1 corresponding to the buffer column 21. A spiral oil groove 12 having a groove diameter of R1mm is disposed on the inner surface of the buffer oil chamber 11 in the axial direction, and the oil groove 12 extends from the cavity bottom 13 of the buffer oil chamber 11 to the cavity port 14, and the cylindrical surface of the buffer column 21 is also along the axis. The direction is distributed with an oil groove 22 having a groove diameter of Rlmra, and the oil groove 22 is from The column bottom 23 of the buffer column 21 extends to the column top 24.
由此构成的本发明的用于混凝土泵的液压柱塞油缸缓冲装置经试 制试用被证明效果良好， 完全达到设计要求。样品缓冲装置试用时可看 到， 柱塞快速冲向油缸底部时， 缓冲柱进入缓冲油腔， 腔中压力油从油 槽和配合间隙溢出， 柱塞开始并完成缓冲减速过程。 该装置缓冲能力随 柱塞进入缓冲油腔的深度增加而增大， 结构简单、 工作可靠、 缓冲减振 效果好。  The hydraulic ram cylinder buffer device for a concrete pump of the present invention thus constructed has been proven to have a good effect and fully meets the design requirements. When the sample buffer device is tested, it can be seen that when the plunger quickly rushes to the bottom of the cylinder, the buffer column enters the buffer oil chamber, and the pressure oil in the chamber overflows from the oil groove and the matching gap, and the plunger starts and completes the buffer deceleration process. The buffering capacity of the device increases with the depth of the plunger entering the buffer oil chamber, and the structure is simple, the work is reliable, and the buffer damping effect is good.

Claims

权利要求 书 Claim
1、 一种液压柱塞油缸缓冲装置， 由油缸 （2) 和插入油缸 （2) 内腔的柱塞 （1)组成， 其中油缸（2) 内腔底面上同轴线设置有一缓 冲柱（21)， 对应缓冲柱（21) 的所述柱塞（1)上同轴线设置有与缓 冲柱（21)大小匹配的缓冲油腔（11)，其特征是，所述缓冲油腔（11) 的内表面上沿轴线方向分布有油槽 （12)， 该油槽 （12) 从缓冲油腔 (11) 的腔底 （13) 延伸至腔口 （14)。  1. A hydraulic plunger cylinder buffer device, comprising a cylinder (2) and a plunger (1) inserted into a cavity of the cylinder (2), wherein a buffer column is disposed on a coaxial line on a bottom surface of the inner chamber of the cylinder (2) (21) The coaxial line on the plunger (1) corresponding to the buffer column (21) is provided with a buffer oil chamber (11) matching the size of the buffer column (21), characterized in that the buffer oil chamber (11) An oil groove (12) is distributed on the inner surface in the axial direction, and the oil groove (12) extends from the cavity bottom (13) of the buffer oil chamber (11) to the cavity mouth (14).
2、 根据权利要求 1所述的液压柱塞油缸缓冲装置， 其特征是， 所 述缓冲柱 （21) 的柱面沿轴线方向分布有油槽 （22)， 该油槽 （22) 从缓冲柱 （21) 的柱底 （23) 延伸至柱顶 （24)。  2. The hydraulic ram cylinder buffer device according to claim 1, wherein the cylinder of the buffer column (21) is distributed with an oil groove (22) in the axial direction, and the oil groove (22) is from the buffer column (21). The bottom of the column (23) extends to the top of the column (24).
3、根据权利要求 1或 2所述的液压柱塞油缸缓冲装置， 其特征是， 所述油槽 （12、 22) 呈螺旋式结构。  The hydraulic ram cylinder cushioning device according to claim 1 or 2, characterized in that the oil grooves (12, 22) have a spiral structure.
PCT/CN2006/000773 2005-04-25 2006-04-24 A cushion mehanism in a hydraulic piston cylinder WO2006114048A1 (en)

Applications Claiming Priority (2)

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CNA2005100314809A CN1854535A (en) 2005-04-25 2005-04-25 Cylinder buffering device of hydraulic plunger cylinder
CN200510031480.9 2005-04-25

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DE102012217531A1 (en) * 2012-09-27 2014-03-27 Jungheinrich Aktiengesellschaft Hydraulic cylinder e.g. lifting cylinder, for e.g. industrial truck, has spiral groove serving as throttle element of damping device for throttling discharge of medium from one of chamber areas to end area of driving-out movement area

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