A valve switch automatic centering device for asphalt spraying and an asphalt spraying vehicle

Abstract

The utility model relates to bituminous paving equipment technical field discloses a valve switch automatic centering device and asphalt paving truck for asphalt paving, include: air cylinder cylinder, front end cover is connected in the front end of air cylinder cylinder, piston is slidably arranged in the air cylinder cylinder, piston rod is connected with piston in one end, and the other end passes through the front end cover and extends outward, centripetal joint bearing has the inner ring and the outer ring, and the inner ring is connected in the extension end of piston rod, valve switch plug, the rear end is connected in the outer ring of centripetal joint bearing, spring is set up in the air cylinder cylinder inside, flange support is fixedly connected in the front end outside of front end cover, and the flange support is equipped with the valve port that supplies the outside wall cooperation of valve switch plug, flange is connected in the front end of flange support, the utility model can automatically compensate the coaxiality deviation of piston rod and valve port, guarantees the sealing reliability, reduces the component wear and tear, prolongs the life.

Description

Technical Field

[0001] This utility model relates to the technical field of asphalt spraying equipment, and discloses an automatic valve switching centering device and an asphalt spraying vehicle for asphalt spraying. Background Technology

[0002] Asphalt distributors are key equipment in road construction and maintenance, controlling the start and stop of asphalt spraying and regulating the flow rate through valve switches. However, during long-term use, existing asphalt distributor valve switches are prone to misalignment between the piston rod axis and the valve port axis due to installation errors, component wear, or vibration.

[0003] This deviation can cause the valve plug and valve port to not seal properly, resulting in asphalt leakage. This not only wastes raw materials but also pollutes equipment and the road surface. At the same time, the uneven load caused by the deviation will aggravate the wear of the plug and valve port, shorten the service life of the valve, increase equipment maintenance costs and downtime, and affect construction efficiency. Utility Model Content

[0004] To address the problems existing in the prior art, the purpose of this utility model is to provide an automatic valve switching centering device for asphalt spraying, which can automatically compensate for the coaxiality deviation between the piston rod and the valve port, ensure sealing reliability, reduce component wear, and extend service life; at the same time, it provides an asphalt spraying vehicle that includes this device, thereby improving the stability and construction quality of asphalt spraying.

[0005] To achieve the above-mentioned technical effects, the technical solution adopted by this utility model is as follows: an automatic valve switching centering device for asphalt spraying, comprising: a cylinder barrel; a front end cover connected to the front end of the cylinder barrel; a piston slidably disposed inside the cylinder barrel; a piston rod, one end of which is connected to the piston, and the other end of which passes through the front end cover and extends outward; a radial spherical bearing having an inner ring and an outer ring, the inner ring of which is connected to the extended end of the piston rod; a valve switch plug, the rear end of which is connected to the outer ring of the radial spherical bearing; a spring disposed inside the cylinder barrel for applying a force to the piston to cause the valve switch plug to act along the length direction of the cylinder barrel; a flange bracket fixedly connected to the front end of the front end cover, the flange bracket having a valve port for the outer side wall of the valve switch plug to mate with; and a flange connected to the front end of the flange bracket.

[0006] As a preferred embodiment, the outer ring of the radial spherical bearing can deflect relative to its inner ring within a preset angle range to compensate for the coaxiality deviation between the axis of the piston rod and the valve port axis of the flange.

[0007] In a preferred embodiment, the spring acts on the inner wall of the piston or the cylinder barrel.

[0008] In a preferred embodiment, the flange bracket has a through hole at its center, which forms a chamber for accommodating and guiding the front end portion of the piston rod, the radial joint bearing, and the rear end portion of the valve switch plug.

[0009] In a preferred embodiment, the valve port is conical or planar, and the valve switch plug is provided with a sealing surface that matches the valve port.

[0010] As a preferred embodiment, a first sealing ring is provided between the front end cover and the cylinder barrel, and a dustproof sealing ring is also provided on the front end cover.

[0011] The present invention also proposes an asphalt spraying vehicle, comprising: the valve switching automatic centering device for asphalt spraying, and a spraying nozzle connected to the outside of the flange.

[0012] Compared with existing technologies, the outer ring of the radial spherical bearing can deflect relative to the inner ring, automatically compensating for the coaxiality deviation between the piston rod and the valve port, avoiding seal failure caused by uneven load, and ensuring sealing reliability. The spring provides continuous preload, which, together with the conical or flat sealing surface and the double protection of the first sealing ring and the dustproof sealing ring, effectively prevents asphalt leakage and dust ingress, improving the sealing effect. The compensation for coaxiality deviation reduces wear on the plug and valve port, and the buffering effect of the spring reduces component impact. Combined with the sealing and dustproof design, it significantly extends the overall service life of the device and reduces maintenance costs. The components are compactly connected and rationally laid out, requiring no complex adjustment mechanism, making installation and maintenance convenient, and adaptable to the construction environment and vibration conditions of asphalt distributors. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall internal structure of this utility model;

[0014] Figure 2 This is a connection structure diagram of the valve switch plug and the radial joint bearing of this utility model;

[0015] Figure 3 This is a schematic diagram showing the valve port fit between the valve switch plug and the flange bracket of this utility model;

[0016] Figure label:

[0017] 1. Cylinder barrel; 2. Front end cover; 3. Piston; 4. Piston rod; 5. Valve switch plug; 6. Spring; 7. Radial spherical bearing; 8. Flange bracket; 81. Valve port; 9. Flange; 10. First sealing ring; 11. Dustproof sealing ring. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the embodiments and accompanying drawings. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0019] Example 1

[0020] This embodiment provides an automatic valve centering device for asphalt spraying. (Reference) Figure 1 , Figure 2 , Figure 3 Example 1: The automatic centering device for valve switching used for asphalt spraying includes a cylinder barrel 1, a front end cover 2, a piston 3, a piston rod 4, a valve switch plug 5, a spring 6, a radial spherical bearing 7, a flange bracket 8, and a flange 9.

[0021] The front cover 2 is connected to the front end of the cylinder barrel 1, and a first sealing ring 10 is provided between the two. The front cover 2 is also provided with a dustproof sealing ring 11, which respectively realizes the functions of sealing and preventing leakage and dust protection.

[0022] The piston 3 is slidably disposed inside the cylinder barrel 1. One end of the piston rod 4 is fixedly connected to the piston 3, and the other end passes through the front end cover 2 and extends outward.

[0023] The radial spherical bearing 7 has an inner ring and an outer ring. The inner ring is fixedly connected to the extended end of the piston rod 4, and the outer ring is fixedly connected to the rear end of the valve switch plug 5. The outer ring can deflect relative to the inner ring within a preset angle range to compensate for the coaxiality deviation between the axis of the piston rod 4 and the valve port axis of the flange 9.

[0024] Spring 6 is located inside cylinder barrel 1 and acts on piston 3 or the inner wall of cylinder barrel 1 to apply force to piston 3 along the length of cylinder barrel 1, so that valve switch plug 5 tends to fit against valve port.

[0025] The flange bracket 8 is fixedly connected to the front end of the front cover 2. It has a through hole in the center, which forms a chamber to accommodate and guide the front end of the piston rod 4, the radial spherical bearing 7 and the rear end of the valve switch plug 5. The flange bracket 8 is provided with a valve port 81 for the outer wall of the valve switch plug 5 to fit. The valve port 81 is conical or planar. The valve switch plug 5 is provided with a sealing surface that matches the valve port 81.

[0026] Flange 9 is connected to the front end of flange bracket 8 and is used to dock with external components.

[0027] When spraying needs to be stopped during use, the compressed air in cylinder 1 is discharged, the spring 6 releases its preload, pushing the piston 3 to move in the opposite direction, causing the valve switch plug 5 to reset towards the valve port 81. During this process, if there is a coaxiality deviation between the piston rod 4 axis and the valve port 81 axis, the outer ring of the radial spherical bearing 7 will automatically deflect relative to the inner ring, so that the sealing surface of the valve switch plug 5 is completely in contact with the valve port 81, achieving automatic centering and sealing.

[0028] The first sealing ring 10 prevents compressed air leakage from the cylinder, and the dustproof sealing ring 11 blocks external dust from entering the cylinder, ensuring long-term stable operation of the device.

[0029] Example 2

[0030] This embodiment provides an asphalt spraying vehicle, including the automatic valve switching centering device for asphalt spraying as described in any of the above claims, and a spraying nozzle is connected to the outside of the flange 9. The automatic centering device controls the start and stop of asphalt spraying and the flow rate adjustment of the spraying nozzle.

[0031] In use, the aforementioned automatic centering device is connected to the spray nozzle via flange 9 and integrated into the spraying system of the asphalt distributor truck. By controlling the on / off state of the cylinder, the start and stop of the spray nozzles are controlled. The automatic centering function ensures the consistency of spraying from each nozzle, avoids asphalt leakage, improves spraying uniformity, and reduces construction losses and equipment maintenance costs.

[0032] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An automatic centering device for valve switching in asphalt spraying, characterized in that, include: Cylinder barrel (1); The front end cap (2) is connected to the front end of the cylinder barrel (1); The piston (3) is slidably disposed inside the cylinder barrel (1); The piston rod (4) has one end connected to the piston (3) and the other end passing through the front end cover (2) and extending outward; The radial spherical bearing (7) has an inner ring and an outer ring, the inner ring of which is connected to the extended end of the piston rod (4); The valve switch plug (5) is connected at its rear end to the outer ring of the radial spherical bearing (7); A spring (6) is disposed inside the cylinder barrel (1) and is used to apply a force to the piston (3) to cause the valve switch plug (5) to act along the length direction of the cylinder barrel (1); A flange bracket (8) is fixedly connected to the front end of the front cover (2). The flange bracket (8) is provided with a valve port (81) for the outer side wall of the valve switch plug (5) to mate with. Flange (9) is connected to the front end of the flange bracket (8).

2. The apparatus according to claim 1, characterized in that, The outer ring of the radial spherical bearing (7) can deflect relative to its inner ring within a preset angle range to compensate for the coaxiality deviation between the axis of the piston rod (4) and the valve port axis of the flange (9).

3. The apparatus according to claim 1, characterized in that, The spring (6) acts on the inner wall of the piston (3) or the cylinder barrel (1).

4. The apparatus according to claim 1, characterized in that, The flange bracket (8) has a through hole at its center, which forms a chamber for accommodating and guiding the front end of the piston rod (4), the radial joint bearing (7), and the rear end of the valve switch plug (5).

5. The apparatus according to claim 1, characterized in that, The valve port (81) has a conical or planar structure, and the valve switch plug (5) has a sealing surface that matches the valve port (81).

6. The apparatus according to claim 1, characterized in that, A first sealing ring (10) is provided between the front end cover (2) and the cylinder barrel (1), and a dustproof sealing ring (11) is also provided on the front end cover (2).

7. An asphalt distributor truck, characterized in that, It includes an automatic valve switching centering device for asphalt spraying as described in any one of claims 1-6, and a spraying nozzle is connected to the outside of the flange (9).

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