WO2022166313A1 - 内置式压力回转密封装置及控制方法 - Google Patents

内置式压力回转密封装置及控制方法 Download PDF

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Publication number
WO2022166313A1
WO2022166313A1 PCT/CN2021/131953 CN2021131953W WO2022166313A1 WO 2022166313 A1 WO2022166313 A1 WO 2022166313A1 CN 2021131953 W CN2021131953 W CN 2021131953W WO 2022166313 A1 WO2022166313 A1 WO 2022166313A1
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Prior art keywords
rotary sealing
pressure
barrel
rotary
sealing ring
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PCT/CN2021/131953
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English (en)
French (fr)
Inventor
盛富春
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山东精砼工程机械股份有限公司
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Publication of WO2022166313A1 publication Critical patent/WO2022166313A1/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
    • 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
    • B28C5/42—Apparatus specially adapted for being mounted on vehicles with provision for mixing during transport
    • B28C5/4203—Details; Accessories
    • B28C5/4206—Control apparatus; Drive systems, e.g. coupled to the vehicle drive-system
    • B28C5/422—Controlling or measuring devices
    • 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
    • B28C5/42—Apparatus specially adapted for being mounted on vehicles with provision for mixing during transport
    • B28C5/4203—Details; Accessories
    • B28C5/4262—Closures; Sealing mechanisms

Definitions

  • the invention relates to a rotary sealing device used for a mixing drum of a concrete mixer truck, and also relates to a control method during concrete transportation.
  • the open structure of traditional concrete mixer truck makes it unable to meet the requirements of transported concrete quality, energy saving and environmental protection. Due to the open surface, the concrete has poor thermal insulation and moisture retention, fast water evaporation, large temperature loss, fast slump loss, high energy consumption, easy to be scattered during transportation, pollute the road and waste.
  • the mixing barrel will be deformed after filling, which leads to the unsatisfactory sealing effect of the traditional fixed pressure-free type.
  • the present invention proposes a built-in pressure rotary sealing device, the purpose of which is to: (1) simplify the structure of the rotary sealing, reduce the weight, and realize the light weight; (2) improve the sealing effect.
  • a built-in pressure rotary sealing device is used to realize the sealing between a barrel body and a rotary sealing cover, the barrel body is installed on the base body and can be rotated relative to the base body, and the rotary sealing cover is buckled and mounted on the rear end of the barrel body. At the opening, a central hole is opened in the middle of the rotary sealing cover.
  • a feeding cylinder for conveying materials to the inside of the barrel runs through the central hole. The feeding cylinder is fixed relative to the base body.
  • the built-in pressure rotary sealing device includes: Rotary sealing ring, pressure belt and outer sealing ring;
  • the rotary sealing ring is wrapped on the outer side of the outer edge of the rotary sealing cover and is fixedly connected with the barrel body; the outer sealing ring and the pressure belt are movably installed on the rear side of the rotary sealing cover, in the radial direction along the barrel body.
  • the above-mentioned outer sealing ring is located between the pressure belt and the rotary sealing ring, and the pressure belt is used for pressing the outer sealing ring outward to make the outer sealing ring contact with the rotary sealing ring to achieve sealing.
  • rotary sealing device also includes a casing, the casing is fixedly installed on the rear side of the rotary sealing cover, and the pressure band and the outer sealing ring are both arranged in the casing.
  • the cross-sectional shape of the casing is L-shaped.
  • a pressure regulating device is also included, and the pressure regulating device is used to adjust the magnitude of the force applied by the pressure belt to the outer sealing ring.
  • the pressure belt and the outer sealing ring are both arc-shaped; the rotary sealing cover is also provided with a discharge port, and the discharge port is in the same position as the gap of the pressure belt. correspond.
  • a limit mechanism for limiting the rotational position of the rotary sealing cover is also included.
  • rotary sealing device also includes a central ring fixedly installed at the central hole on the rear side of the rotary sealing cover, and the feeding barrel passes through the central ring; a flange is also installed on the feeding barrel, and the The flange is located on the rear side of the center ring, which is used to realize the axial positioning of the rotary sealing cover;
  • the limiting mechanism includes a protruding block arranged on the center ring and a blocking block arranged on the flange; the protruding block is one part and the blocking block is two parts, or the protruding block is two parts and the blocking block is one part .
  • a soft sealing ring is also arranged between the outer edge of the rotary sealing cover and the rear end of the barrel.
  • the invention also provides a concrete transportation control method.
  • the rotary sealing device further includes a pressure regulating device, and the pressure regulating device is used to adjust the force applied by the pressure belt to the outer sealing ring; a material port; the rotary sealing device further includes a limit mechanism for limiting the rotational position of the rotary sealing cover;
  • the steps of the control method are as follows: the control unit controls the rotation of the barrel to realize the function switching of sealing and discharging; before transportation, the barrel is rotated forward until the limit mechanism prevents the rotary sealing cover from rotating with the barrel and discharging.
  • the mouth stops above the axis of the barrel body. At this time, the barrel mouth of the barrel body is in a closed state, and normal transportation can be carried out; during the discharging operation, increase the pressure of the pressure belt, and control the barrel body to drive the rotary sealing cover to rotate in the opposite direction until the The limit mechanism prevents the rotary sealing cover from rotating with the barrel body and the discharge port stops below the axis of the barrel body, and the barrel body is in the discharge state at this time;
  • control unit is connected in communication with the vehicle-mounted control system of the mixer truck carrying the barrel body, so as to realize the integrated control of the mixer truck traveling, the barrel body rotation, the discharging and the working pressure of the pressure belt.
  • the present invention has the following beneficial effects: (1) The outer sealing ring is supported by a pressure belt to make it in close contact with the rotary sealing ring to achieve the effect of rotary sealing, with simple structure, light weight and low cost And easy to maintain; (2) Through the pressure adjustment of the pressure belt, the appropriate pressure can be adjusted according to the working conditions, so as to realize the function switching of sealing and discharging, improve the sealing effect, and reduce the wear of the outer sealing ring and the rotary sealing ring; (3) The rotation control of the rotary sealing cover is realized through the cooperation of the bump and the stopper. When the stopper blocks the bump, the rotary sealing cover cannot follow the rotation of the barrel, so that the discharge port stops at the required position (located at the required position).
  • the rotary seal can be transported normally at the top, and the discharge operation can be carried out at the bottom).
  • the rotary seal cover can rotate with the barrel to realize the switching between sealing and discharging functions;
  • Limit The mechanism is integrated on the center ring and the flange, and has a compact structure. While realizing the axial positioning of the rotary sealing cover, it also realizes the function switching function and automatic operation; (5)
  • the present invention can not only realize automatic operation such as function switching, but also can be combined with
  • the on-board control system is networked to realize integrated collaborative control, laying the foundation for the unmanned intelligent transportation of concrete.
  • Fig. 1 is the structural schematic diagram when the device is installed on the rear side of the mixing barrel
  • Figure 2 is a partial view of the junction of the rear end of the barrel, the rotary sealing ring and the rotary sealing cover;
  • Figure 3 is a rear view of the rotary sealing cover and the pressure sealing mechanism part
  • Figure 4 is a schematic diagram of the structure of the center ring and flange parts.
  • a built-in pressure rotary sealing device is used to realize the sealing between the barrel 1 (mainly referring to the mixing barrel) and the rotary sealing cover 5.
  • the barrel body 1 is mounted on the base body and can be rotated relative to the base body (such as a vehicle frame).
  • a central hole is opened in the middle of the rotary sealing cover 5, and a feeding barrel 4 (installed at the outlet of the feeding hopper 3) for conveying materials to the inside of the barrel 1 runs through the central hole, the feeding hopper 3 and the feeding barrel 4 is fixed relative to the base body.
  • the built-in pressure rotary sealing device includes a rotary sealing ring 2 , a pressure band 7 and an outer sealing ring 8 .
  • the rotary sealing ring 2 is wrapped around the outer edge of the rotary sealing cover 5 and is fixedly connected with the barrel 1 .
  • Both the outer sealing ring 8 and the pressure band 7 are movably installed on the rear side of the rotary sealing cover 5, and the outer sealing ring 8 is located between the pressure band 7 and the rotary sealing ring 2 along the radial direction of the barrel 1,
  • the pressure belt 7 is used to press the outer sealing ring 8 outward to make the outer sealing ring 8 contact with the rotary sealing ring 2 to achieve sealing.
  • the casing 6 also includes a casing 6, the cross-sectional shape of the casing 6 is L-shaped, the casing 6 is fixedly installed on the rear side of the rotary sealing cover 5, and the pressure band 7 and the outer sealing ring 8 are both arranged on the casing. 6 in.
  • the pressure belt 7 is inflatable or liquid-filled; or an elastic body, which supports the outer sealing ring 8 outward when the end is stressed.
  • a pressure regulating device is also included, and the pressure regulating device is used to adjust the magnitude of the force applied by the pressure band 7 to the outer sealing ring 8 (eg, to control the pressure of the fluid charged into the pressure band 7 ).
  • the housing 6 , the pressure band 7 and the outer sealing ring 8 are all arc-shaped.
  • the rotary sealing cover 5 is also provided with a discharge port 5-1, and the discharge port 5-1 corresponds to the position of the notch of the pressure belt 7 .
  • the discharge port 5-1 When the discharge port 5-1 is located above, the discharge port 5-1 is used to communicate the inside of the barrel 1 with the outside atmosphere; when the discharge port 5-1 is located below, the discharge port 5-1 is used to discharge the material .
  • the discharge port (5-1) can also be closed.
  • the device also includes a central ring 9 fixedly installed at the central hole on the rear side of the rotary sealing cover 5, and the feeding cylinder 4 passes through the central ring 9; the feeding cylinder 4 is also provided with a flange 11 , the flange 11 is located on the rear side of the center ring 9 for realizing the axial positioning of the rotary sealing cover 5 .
  • the device also includes a limiting mechanism for limiting the rotational position of the rotary sealing cover 5 .
  • the limiting mechanism includes a protrusion 10 arranged on the center ring 9 and a stopper 12 arranged on the flange 11 .
  • the convex block 10 is one part and the stopper block 12 is two parts, or the convex block 10 is two parts and the stopper block 12 is one part, which is used to realize the switching of the two functions (the position of the discharge port 5-1).
  • a soft sealing ring is also arranged between the outer edge of the rotary sealing cover 5 and the rear end of the barrel body 1 to ensure effective sealing when the mixing drum is deformed and the driving is bumpy.
  • the barrel body 1 is provided with a central barrel, the feeding barrel 4 extends into the central barrel, and a sealing rubber plate is arranged between the central barrel and the feeding barrel 4 to prevent the concrete from moving along. The overflow between the center barrel and the feed barrel 4 and the gap deposits between them.
  • Another positive effect of the rotary sealing cover is that it can block the concrete leaking from the gap between the central barrel and the feeding barrel 4 into the mixing drum.
  • a reinforcing ring is also provided at the outer edge of the rotary sealing cover 5 .
  • the pressure belt 7 supports the outer sealing ring 8 outwards, so that it is in close contact with the rotary sealing ring 2, so as to realize the effective sealing between the rotary sealing cover 5 and the barrel 1, and improve the sealing effect.
  • the rotary sealing The cover 5 rotates with the barrel 1 under the action of friction.
  • control unit to control the rotation of the barrel 1 to realize function switching: Before transportation, the barrel 1 rotates forward until the limit mechanism stops the rotary sealing cover 5 from rotating with the barrel 1 and the outlet 5-1 stops at the barrel 1 above the axis, the mixing barrel is in a sealed state, Normal transportation can be carried out; when discharging, control the reverse rotation of the barrel 1 until the limit mechanism prevents the rotary sealing cover 5 from rotating with the barrel 1 and the discharge port 5-1 stops below the axis of the barrel 1. At this time The mixing tank is in discharge state. By controlling the rotation direction of the barrel body 1, the switching of functions can be controlled.
  • the pressure of the pressure belt 7 is adjusted according to the current working state.
  • increasing the pressure of the pressure belt 7 increases the frictional force between the outer sealing ring 8 and the rotary sealing ring 2 .
  • the control unit is communicated and connected with the vehicle-mounted control system of the mixer truck carrying the barrel body 1 , so as to realize the integrated control of the driving of the mixer truck, the rotation of the barrel body 1 , the discharging and the working pressure of the pressure belt 7 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)

Abstract

公开了一种内置式压力回转密封装置，用于实现桶体(1)与回转密封盖(5)之间的密封，桶体安装在基体上并可相对于基体回转，回转密封盖扣装在桶体后端的开口处。该密封装置包括回转密封环(2)、压力带(7)和外密封环(8)；回转密封环包裹在回转密封盖外边缘的外侧且与桶体固定连接；外密封环和压力带均活动安装在回转密封盖的后侧，在沿桶体的径向方向上外密封环位于压力带和回转密封环之间，压力带用于向外挤压外密封环以使外密封环与回转密封环接触实现密封。该装置具有密封效果好、结构简单、重量轻便、成本低和便于维护等优点。还公开了一种内置式压力回转密封装置的控制方法。

Description

内置式压力回转密封装置及控制方法 技术领域
本发明涉及一种用于混凝土搅拌车搅拌筒的回转密封装置，还涉及一种混凝土运输过程中的控制方法。
 背景技术
传统混凝土搅拌车的敞口式结构，使其无法满足所运输混凝土质量、节能、环保的要求。由于敞口，混凝土保温保湿性不好，水分蒸发快，温度损失大，坍落度损失快，能耗高，运输途中易遗撒，污染道路且浪费。
尽管现有技术中提出了改进的回转密封结构，实现了搅拌筒的封闭，但是这类回转密封机构都存在结构复杂、重量大、价格高、维护工作量较大的缺点，在满足轻量化要求方面还需改进。
另外，搅拌桶装料后会产生变形，导致传统的固定无压力式的密封效果始终不理想。
 技术问题
本发明提出了一种内置式压力回转密封装置，其目的是：（1）简化回转密封的结构，减轻重量，实现轻量化；（2）提高密封效果。
 技术解决方案
一种内置式压力回转密封装置，用于实现桶体与回转密封盖之间的密封，所述桶体安装在基体上并可相对于基体回转，所述回转密封盖扣装在桶体后端的开口处，回转密封盖中部开设有中心孔，所述中心孔中贯穿有用于向桶体内部输送物料的输料筒，该输料筒相对于基体固定设置，所述内置式压力回转密封装置包括回转密封环、压力带和外密封环；
所述回转密封环包裹在回转密封盖外边缘的外侧且与所述桶体固定连接；所述外密封环和压力带均活动安装在回转密封盖的后侧，在沿桶体的径向方向上所述外密封环位于压力带和回转密封环之间，所述压力带用于向外挤压外密封环以使外密封环与回转密封环接触实现密封。
作为上述回转密封装置的进一步改进：还包括壳体，所述壳体固定安装在回转密封盖的后侧，所述压力带和外密封环均设置在壳体中。
作为上述回转密封装置的进一步改进：所述壳体的截面形状为L形。
作为上述回转密封装置的进一步改进：还包括调压装置，所述调压装置用于调整压力带施加给外密封环的力大小。
作为上述回转密封装置的进一步改进：所述压力带和外密封环均为圆弧形；所述回转密封盖上还开设有出料口，所述出料口与所述压力带的缺口位置相对应。
作为上述回转密封装置的进一步改进：还包括用于限制所述回转密封盖的转动位置的限位机构。
作为上述回转密封装置的进一步改进：还包括固定安装在回转密封盖后侧中心孔处的中心环，所述输料筒穿过中心环；所述输料筒上还安装有法兰，所述法兰位于中心环的后侧、用于实现回转密封盖的轴向定位；
所述限位机构包括设置在中心环上的凸块和设置在法兰上的挡块；所述凸块为一部、挡块为两部，或者凸块为两部、挡块为一部。
作为上述回转密封装置的进一步改进：所述回转密封盖的外边缘与桶体后端之间还设置有软质密封圈。
本发明还提出了一种混凝土运输控制方法，回转密封装置还包括调压装置，所述调压装置用于调整压力带施加给外密封环的力大小；所述回转密封盖上还开设有出料口；所述回转密封装置还包括用于限制所述回转密封盖的转动位置的限位机构；
所述控制方法的步骤为：控制单元控制桶体的旋转以实现密封和出料的功能切换；进行运输前，桶体正向旋转，直至限位机构阻挡回转密封盖跟随桶体转动且出料口停在桶体轴线的上方，此时桶体的桶口处于封闭状态，可进行正常运输；进行出料操作时，提高压力带的压力，控制桶体带动回转密封盖一起反向旋转，直至限位机构阻挡回转密封盖跟随桶体转动且出料口停在桶体轴线的下方，此时桶体处于出料状态；
上述过程中，当需要回转密封盖随桶体一起旋转时，提高压力带的压力使外密封环和回转密封环之间的摩擦力提高；当需要桶体转动而回转密封盖在限位机构作用下静止时，调整压力带的压力，在保证密封效果的同时，减少外密封环与回转密封环之间的磨损。
作为该控制方法的进一步改进：所述控制单元与承载所述桶体的搅拌车的车载控制系统通讯连接，实现搅拌车行驶、桶体回转、出料以及压力带工作压力的一体化控制。
 有益效果
相对于现有技术，本发明具有以下有益效果：（1）采用压力带向外撑起外密封环，使其与回转密封环紧密接触，达到回转密封的效果，结构简单，重量轻便，成本低且便于维护；（2）通过压力带的压力调整，来根据工况需要调整合适的压力大小，从而实现密封和出料的功能切换以及提高密封效果，减少外密封环和回转密封环的磨损；（3）通过凸块和挡块的配合，实现回转密封盖的回转控制，当挡块阻挡凸块时，回转密封盖无法跟随桶体转动，使出料口停在所需的位置上（位于上方可正常运输的回转密封，位于下方则可以进行出料操作），当挡块未阻挡凸块时，回转密封盖可跟随桶体转动，实现密封和出料功能的切换；（4）限位机构集成在中心环和法兰上，结构紧凑，在实现回转密封盖轴向定位的同时还实现了功能切换功能及自动化操作；（5）本发明不仅能够实现功能切换等自动化操作，还可以与车载控制系统联网，实现一体化的协同控制，为混凝土的无人智能运输奠定基础。
 附图说明
图1为本装置安装在搅拌桶后侧时的结构示意图；
图2为桶体后端、回转密封环及回转密封盖相接处的局部图；
图3为回转密封盖及压力密封机构部分的后视图；
图4为中心环和法兰部分的结构示意图。
 本发明的实施方式
下面结合附图详细说明本发明的技术方案：
如图1，一种内置式压力回转密封装置，用于实现桶体1（主要是指搅拌桶）与回转密封盖5之间的密封。
所述桶体1安装在基体上并可相对于基体（如车架）回转，所述回转密封盖5扣装在桶体1后端的开口处。回转密封盖5中部开设有中心孔，所述中心孔中贯穿有用于向桶体1内部输送物料的输料筒4（安装在进料斗3的出口处），进料斗3和输料筒4相对于基体固定设置。
如图2，所述内置式压力回转密封装置包括回转密封环2、压力带7和外密封环8。
所述回转密封环2包裹在回转密封盖5外边缘的外侧且与所述桶体1固定连接。所述外密封环8和压力带7均活动安装在回转密封盖5的后侧，在沿桶体1的径向方向上所述外密封环8位于压力带7和回转密封环2之间，所述压力带7用于向外挤压外密封环8以使外密封环8与回转密封环2接触实现密封。
进一步的，还包括壳体6，壳体6的截面形状为L形，所述壳体6固定安装在回转密封盖5的后侧，所述压力带7和外密封环8均设置在壳体6中。
所述压力带7为充气式或充液式；或者是弹性体，在端部受力时向外撑起外密封环8。
进一步的，还包括调压装置，所述调压装置用于调整压力带7施加给外密封环8的力大小（如控制充入压力带7内部的流体的压力）。
如图3，所述壳体6、压力带7和外密封环8均为圆弧形。所述回转密封盖5上还开设有出料口5-1，所述出料口5-1与所述压力带7的缺口位置相对应。当出料口5-1位于上方时，出料口5-1用于将桶体1内部与外界大气连通；当出料口5-1位于下方时，出料口5-1用于出料。为了冬季保温，和旱季保湿，出料口（5-1）也可以封闭。
如图4，本装置还包括固定安装在回转密封盖5后侧中心孔处的中心环9，所述输料筒4穿过中心环9；所述输料筒4上还安装有法兰11，所述法兰11位于中心环9的后侧、用于实现回转密封盖5的轴向定位。
本装置还包括用于限制所述回转密封盖5的转动位置的限位机构。具体的，所述限位机构包括设置在中心环9上的凸块10和设置在法兰11上的挡块12。所述凸块10为一部、挡块12为两部，或者凸块10为两部、挡块12为一部，用于实现两个功能（出料口5-1位置）的切换。
进一步的，所述回转密封盖5的外边缘与桶体1后端之间还设置有软质密封圈，确保在搅拌筒装料变形和行驶颠簸时的有效密封。
所述桶体1内部设有中心料筒，所述输料筒4伸入所述中心料筒，所述中心料筒与所述输料筒4之间设有密封胶板，防止混凝土沿着中心料筒和输料筒4之间外溢和在它们之间的缝隙积淀。
回转密封盖还有一个积极的效果是可以阻挡所述中心料筒与所述输料筒4之间的缝隙漏出的混凝土于搅拌桶内。
为了增加使用寿命，所述回转密封盖5的外边缘处还设有加强环。
工作时，所述压力带7向外撑起外密封环8，使之与回转密封环2紧密接触，实现回转密封盖5与桶体1之间的有效密封，提高密封效果，同时，回转密封盖5在摩擦力的作用下，跟随桶体1转动。使用控制单元控制桶体1的旋转以实现功能切换：进行运输前，桶体1正向旋转，直至限位机构阻挡回转密封盖5跟随桶体1转动且出料口5-1停在桶体1轴线的上方，此时搅拌桶处于密封状态，             可进行正常运输；进行出料时，控制桶体1反向旋转，直至限位机构阻挡回转密封盖5跟随桶体1转动且出料口5-1停在桶体1轴线的下方，此时搅拌桶处于出料状态。通过控制桶体1的旋转方向，可以控制功能的切换。
在桶体1转动过程中，根据当前的工作状态，调整压力带7的压力。当需要回转密封盖5随桶体1一起旋转时，提高压力带7的压力使外密封环8和回转密封环2之间的摩擦力提高。当需要桶体1转动而回转密封盖5在限位机构作用下静止时，调整压力带7的压力到保证密封效果的最低压力值，在保证密封效果的同时，减少外密封环8与回转密封环2之间的磨损。
所述控制单元与承载所述桶体1的搅拌车的车载控制系统通讯连接，实现搅拌车行驶、桶体1回转、出料以及压力带7工作压力的一体化控制。

Claims (10)

  1. 一种内置式压力回转密封装置，用于实现桶体（1）与回转密封盖（5）之间的密封，所述桶体（1）安装在基体上并可相对于基体回转，所述回转密封盖（5）扣装在桶体（1）后端的开口处，回转密封盖（5）中部开设有中心孔，所述中心孔中贯穿有用于向桶体（1）内部输送物料的输料筒（4），该输料筒（4）相对于基体固定设置，其特征在于：所述内置式压力回转密封装置包括回转密封环（2）、压力带（7）和外密封环（8）；
    所述回转密封环（2）包裹在回转密封盖（5）外边缘的外侧且与所述桶体（1）固定连接；所述外密封环（8）和压力带（7）均活动安装在回转密封盖（5）的后侧，在沿桶体（1）的径向方向上所述外密封环（8）位于压力带（7）和回转密封环（2）之间，所述压力带（7）用于向外挤压外密封环（8）以使外密封环（8）与回转密封环（2）接触实现密封。
  2. 如权利要求1所述的内置式压力回转密封装置，其特征在于：还包括壳体（6），所述壳体（6）固定安装在回转密封盖（5）的后侧，所述压力带（7）和外密封环（8）均设置在壳体（6）中。
  3. 如权利要求2所述的内置式压力回转密封装置，其特征在于：所述壳体（6）的截面形状为L形。
  4. 如权利要求1所述的内置式压力回转密封装置，其特征在于：还包括调压装置，所述调压装置用于调整压力带（7）施加给外密封环（8）的力大小。
  5. 如权利要求1所述的内置式压力回转密封装置，其特征在于：所述压力带（7）和外密封环（8）均为圆弧形；所述回转密封盖（5）上还开设有出料口（5-1），所述出料口（5-1）与所述压力带（7）的缺口位置相对应。
  6. 如权利要求5所述的内置式压力回转密封装置，其特征在于：还包括用于限制所述回转密封盖（5）的转动位置的限位机构。
  7. 如权利要求6所述的内置式压力回转密封装置，其特征在于：还包括固定安装在回转密封盖（5）后侧中心孔处的中心环（9），所述输料筒（4）穿过中心环（9）；所述输料筒（4）上还安装有法兰（11），所述法兰（11）位于中心环（9）的后侧、用于实现回转密封盖（5）的轴向定位；
    所述限位机构包括设置在中心环（9）上的凸块（10）和设置在法兰（11）上的挡块（12）；所述凸块（10）为一部、挡块（12）为两部，或者凸块（10）为两部、挡块（12）为一部。
  8. 如权利要求1至7任一所述的内置式压力回转密封装置，其特征在于：所述回转密封盖（5）的外边缘与桶体（1）后端之间还设置有软质密封圈。
  9. 基于如权利要求1所述的内置式压力回转密封装置的混凝土运输控制方法，其特征在于：回转密封装置还包括调压装置，所述调压装置用于调整压力带（7）施加给外密封环（8）的力大小；所述回转密封盖（5）上还开设有出料口（5-1）；所述回转密封装置还包括用于限制所述回转密封盖（5）的转动位置的限位机构；
    所述控制方法的步骤为：控制单元控制桶体（1）的旋转以实现密封和出料的功能切换；进行运输前，桶体（1）正向旋转，直至限位机构阻挡回转密封盖（5）跟随桶体（1）转动且出料口（5-1）停在桶体（1）轴线的上方，此时桶体（1）的桶口处于封闭状态，可进行正常运输；进行出料操作时，提高压力带（7）的压力，控制桶体（1）带动回转密封盖（5）一起反向旋转，直至限位机构阻挡回转密封盖（5）跟随桶体（1）转动且出料口（5-1）停在桶体（1）轴线的下方，此时桶体（1）处于出料状态；
    上述过程中，当需要回转密封盖（5）随桶体（1）一起旋转时，提高压力带（7）的压力使外密封环（8）和回转密封环（2）之间的摩擦力提高；当需要桶体（1）转动而回转密封盖（5）在限位机构作用下静止时，调整压力带（7）的压力，在保证密封效果的同时，减少外密封环（8）与回转密封环（2）之间的磨损。
  10. 基于如权利要求9所述的混凝土运输控制方法，其特征在于：所述控制单元与承载所述桶体（1）的搅拌车的车载控制系统通讯连接，实现搅拌车行驶、桶体（1）回转、出料以及压力带（7）工作压力的一体化控制。
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