A rubber piston for concrete pumps with noise reduction function

Abstract

This utility model relates to the field of piston technology, specifically to a concrete pump rubber piston with noise reduction function. It includes a piston body with a hollow cavity inside. This reduces the overall weight of the piston and decreases the inertial force of its movement, reducing impact energy with the pipeline and further reducing noise. A filling layer is provided inside the hollow cavity. The sound-absorbing properties of the porous sound-absorbing material within the filling layer absorb the mechanical vibration noise and fluid noise generated during piston movement. A corrugated sealing edge is fixedly connected to the lower outer side of the piston body. This corrugated surface disrupts the flow boundary layer of the concrete fluid, making the fluid flow smoother and reducing noise generated by turbulence. Simultaneously, the corrugated structure increases the contact area between the piston and the concrete, dispersing the impact force during piston movement to a certain extent and reducing impact noise.

Description

Technical Field

[0001] This utility model relates to the field of piston technology, and more specifically, to a rubber piston for a concrete pump with noise reduction function. Background Technology

[0002] Against the backdrop of the booming development of the modern construction industry, concrete pump trucks (referred to as concrete pumps), as highly efficient concrete conveying equipment, are widely used in the construction of large-scale projects such as high-rise buildings, bridges, and tunnels. Concrete pumps use the reciprocating motion of rubber pistons to push concrete from the hopper to the conveying pipeline and finally deliver it to the construction site; their efficiency directly affects the project progress. However, with the acceleration of urbanization and increasingly stringent environmental protection requirements, the noise generated by concrete pumps during operation has gradually become a focus of industry attention, and the rubber piston of the concrete pump is one of the main components generating noise.

[0003] There are many existing technologies for piston structures, such as:

[0004] According to Chinese patent application number CN202323630729.0, specifically, a piston includes a piston head, a piston connecting rod fixedly mounted at the lower end of the piston head, and a connecting rod cover below the piston connecting rod. The two sides of the connecting rod cover are connected to the two sides of the lower end of the piston connecting rod via a first connecting assembly and a second connecting assembly with identical structures. The first connecting assembly includes a mounting block fixedly mounted on the upper left side of the connecting rod cover. The lower end of the piston connecting rod has a mounting groove matching the mounting block. A positioning component for positioning the mounting block is provided on the piston connecting rod. The beneficial effects of this invention are: by setting the positioning component, the connecting rod cover does not need to be held by hand during installation; it can be positioned by inserting the connecting rod cover into the piston connecting rod. The fixing component also allows the positioning pin to be used as a positioning pin after fixing, making the installation stable.

[0005] During operation, the rubber piston of a traditional concrete pump generates harsh mechanical and fluid noise due to friction and impact with the inner wall of the conveying pipeline, as well as pressure fluctuations generated when pumping concrete. This not only affects the construction environment but may also damage the hearing of operators. Utility Model Content

[0006] This utility model addresses the technical problems existing in the prior art by providing a concrete pump rubber piston with noise reduction function, thus solving the problem that traditional pistons generate harsh noise due to friction and impact with the inner wall of the pipeline and fluctuations in concrete pressure, which affects the construction environment.

[0007] To achieve the above objectives, this utility model provides a concrete pump rubber piston with noise reduction function, including a piston body. The piston body has a hollow cavity inside, which reduces the overall weight of the piston and the inertial force of the piston movement. The hollow cavity has a filling layer inside, which absorbs the mechanical vibration noise and fluid noise generated during the piston movement through the sound absorption performance of the porous sound-absorbing material in the filling layer. A corrugated sealing edge is fixedly connected to the lower outer side of the piston body.

[0008] The beneficial effects of this utility model are:

[0009] 1. When concrete is sucked in or expelled from the cylinder, the pressure inside and outside the piston changes drastically. At this time, the sound absorption properties of the porous sound-absorbing material in the filling layer absorb the mechanical vibration noise and fluid noise generated during the piston movement. The hollow cavity can also reduce the overall weight of the piston, reduce the inertial force of the piston movement, and reduce the impact energy with the pipeline, thereby further reducing noise.

[0010] 2. When the piston moves in the delivery pipeline, the wave-shaped surface of the sealing edge can disrupt the flow boundary layer of the concrete fluid, making the fluid flow more stable and reducing the noise generated by turbulence. The wave-shaped structure increases the contact area between the piston and the concrete, which disperses the impact force when the piston moves to a certain extent and reduces the impact noise.

[0011] Based on the above technical solution, the present invention can be further improved as follows.

[0012] Preferably, a plurality of sealing lips are fixedly connected to the upper outer side of the piston body, and the height and width of the plurality of sealing lips are different, with the width increasing sequentially from bottom to top.

[0013] The beneficial effect of adopting the above-mentioned further solution is that this design can gradually seal and guide the concrete, reduce concrete leakage and pressure surges at the piston edge, and reduce fluid noise.

[0014] Preferably, a spring is fixedly connected inside the sealing lip.

[0015] The beneficial effect of adopting the above-mentioned further solution is that the elastic compensation structure of the spring can automatically adjust the deformation of the sealing lip, ensuring a good sealing effect, while mitigating vibration and noise caused by pressure fluctuations.

[0016] Preferably, rubber buffer rings are fixedly connected to both the top and bottom of the piston body.

[0017] The beneficial effect of adopting the above-mentioned further solution is that when the piston moves to the end of its stroke, the rubber buffer ring first contacts the inner wall of the pipe, which plays a buffering role, reduces the rigid impact between the piston and the pipe, and reduces impact noise.

[0018] Preferably, the piston body, the corrugated sealing edge, and the sealing lip are all made of a new type of low-friction, high-wear-resistant rubber material, such as a composite material of hydrogenated nitrile butadiene rubber (HNBR) and polytetrafluoroethylene (PTFE). The piston body, the corrugated sealing edge, and the sealing lip are all coated with a nano-scale friction-reducing and noise-reducing coating.

[0019] The beneficial effect of adopting the above-mentioned further solution is that the nano-coating on the surface of the HNBR and PTFE composite material further reduces the coefficient of friction, reduces frictional heat generation, and effectively inhibits rubber aging caused by high temperature.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] By incorporating a hollow cavity and a filling layer within the piston body, and utilizing porous sound-absorbing material such as polyester fiber sound-absorbing cotton in the filling layer, mechanical vibration noise and fluid noise generated during piston movement can be absorbed. The hollow cavity also reduces the overall weight of the piston, lowers the inertial force of piston movement, and reduces impact energy with the pipeline, thereby further reducing noise. Furthermore, the corrugated sealing edge beneath the piston body disrupts the flow boundary layer of the concrete fluid as the piston moves within the delivery pipeline, resulting in smoother fluid flow and reduced noise from turbulence. Simultaneously, the corrugated structure increases the contact area between the piston and the concrete, dispersing the impact force during piston movement to some extent and reducing impact noise. Attached Figure Description

[0022] Figure 1 This is an isometric view of one side of the overall structure of this utility model;

[0023] Figure 2 This is a front cross-sectional view of the present invention.

[0024] The meanings of the labels in the diagram are as follows:

[0025] 1. Piston body; 11. Hollow cavity; 12. Filling layer;

[0026] 2. Wavy sealing edge;

[0027] 3. Sealing lip; 31. Spring;

[0028] 4. Rubber buffer ring. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Please see Figures 1-2 As shown, this embodiment provides a concrete pump rubber piston with noise reduction function, including a piston body 1. Considering that traditional pistons generate harsh noise due to friction and impact with the inner wall of the pipe and fluctuations in concrete pressure, which affects the construction environment, a hollow cavity 11 is provided inside the piston body 1 to reduce the overall weight of the piston and reduce the inertial force of the piston movement. A filling layer 12 is provided inside the hollow cavity 11. The sound absorption performance of the porous sound-absorbing material in the filling layer 12 absorbs the mechanical vibration noise and fluid noise generated during the piston movement. A corrugated sealing edge 2 is fixedly connected to the lower outer side of the piston body 1.

[0031] In summary, the improvements in this embodiment are as follows:

[0032] The porous sound-absorbing material in the filling layer 12, such as polyester fiber sound-absorbing cotton, can absorb the mechanical vibration noise and fluid noise generated during the piston movement. The hollow cavity 11 can also reduce the overall weight of the piston, reduce the inertial force of the piston movement, and reduce the impact energy with the pipe, thereby further reducing noise.

[0033] The corrugated sealing edge 2 below the piston body 1 disrupts the flow boundary layer of the concrete fluid as the piston moves within the delivery pipe, resulting in smoother fluid flow and reduced noise from turbulence. Simultaneously, the corrugated structure increases the contact area between the piston and the concrete, dispersing the impact force during piston movement and reducing impact noise.

[0034] Specifically,

[0035] To reduce concrete leakage and pressure surges at the piston edge, and to lower fluid noise, several sealing lips 3 are fixedly connected to the upper outer side of the piston body 1. These sealing lips 3 have varying heights and widths, with the width increasing progressively from bottom to top. This design allows for gradual sealing and guidance of the concrete, reducing leakage and pressure surges at the piston edge and lowering fluid noise. Simultaneously, the stepped sealing lips ensure a more uniform pressure distribution when in contact with the inner wall of the pipe, reducing frictional noise caused by excessive local pressure.

[0036] In order to effectively ensure the sealing effect of the sealing lip 3, a spring 31 is fixedly connected inside the sealing lip 3. When the piston is subjected to pressure changes in the pipeline, the elastic compensation structure of the spring 31 can automatically adjust the deformation of the sealing lip 3 to ensure a good sealing effect and at the same time alleviate the vibration noise caused by pressure fluctuations.

[0037] In order to improve the piston's pressure resistance and effectively extend its service life, rubber buffer rings 4 are fixedly connected to the top and bottom of the piston body 1. The rubber buffer rings 4 are made of highly elastic and highly damped rubber material. When the piston moves to the end of its stroke, the rubber buffer rings 4 first contact the inner wall of the pipe, which plays a buffering role, reduces the rigid impact between the piston and the pipe, and reduces impact noise.

[0038] Furthermore, the piston body 1, the corrugated sealing edge 2, and the sealing lip 3 are all made of new low-friction, high-wear-resistant rubber materials, such as a composite material of hydrogenated nitrile butadiene rubber (HNBR) and polytetrafluoroethylene (PTFE). This material has a low coefficient of friction, which can reduce frictional noise between the piston and the inner wall of the pipe, while also possessing good wear resistance and extending the service life of the piston. The surfaces of the piston body 1, the corrugated sealing edge 2, and the sealing lip 3 are all coated with a nano-level friction-reducing and noise-reducing coating. The coating has self-lubricating properties, further reducing friction between the piston and the concrete and the inner wall of the pipe, and reducing noise generation. At the same time, the coating also plays a role in corrosion prevention, protecting the piston body 1 material from corrosion.

[0039] In summary, the working principle of this solution is as follows:

[0040] When concrete is sucked in or expelled from the cylinder, the pressure inside and outside the piston changes drastically. At this time, the sound absorption properties of the porous sound-absorbing material in the filling layer 12 absorb the mechanical vibration noise and fluid noise generated during the piston's movement. The hollow cavity 11 also reduces the overall weight of the piston, reduces the inertial force of the piston's movement, and reduces the impact energy with the pipeline, thereby further reducing noise. The wave-shaped sealing edge 2 on the outside of the piston body 1 works in conjunction with the stepped sealing lip 3. The wave-shaped sealing edge 2 allows the flow boundary layer of the concrete fluid to be disrupted when the piston moves in the delivery pipeline, making the fluid flow smoother and reducing the noise generated by turbulence. The wave-shaped structure increases the contact area between the piston and the concrete, which disperses the impact force during piston movement to a certain extent and reduces impact noise. At the same time, multiple sealing lips 3 of different heights resist pressure step by step. When the pressure increases, the spring 31 pushes the sealing lip 3 to press tightly against the pipe wall, forming multiple independent sealing defenses. The nano-coating on the surface of the HNBR and PTFE composite material further reduces the coefficient of friction, reduces frictional heat generation, and effectively inhibits rubber aging caused by high temperature. At the end of the piston stroke, the rubber buffer ring 4 first contacts the cylinder end face, playing a buffering role, reducing the rigid impact between the piston and the pipe, and reducing impact noise.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A rubber piston for a concrete pump with noise reduction, comprising a piston body (1), characterized in that: The piston body (1) has a hollow cavity (11) inside, which reduces the overall weight of the piston and the inertial force of the piston movement. The hollow cavity (11) has a filling layer (12) inside, which absorbs the mechanical vibration noise and fluid noise generated during the piston movement through the sound absorption performance of the porous sound-absorbing material in the filling layer (12). A corrugated sealing edge (2) is fixedly connected to the lower outer side of the piston body (1).

2. The rubber piston of a concrete pump with noise reduction function according to claim 1, characterized in that: Several sealing lips (3) are fixedly connected to the upper outer side of the piston body (1).

3. The rubber piston of a concrete pump with noise reduction function according to claim 2, characterized in that: The height and width of the multiple sealing lips (3) are different, and the width increases sequentially from bottom to top.

4. The rubber piston of a concrete pump with noise reduction function according to claim 2, characterized in that: A spring (31) is fixedly connected inside the sealing lip (3).

5. The rubber piston of a concrete pump with noise reduction function according to claim 1, characterized in that: The piston body (1) is fixedly connected to both the top and bottom with rubber buffer rings (4).

6. The rubber piston of a concrete pump with noise reduction function according to claim 2, characterized in that: The piston body (1), the wavy sealing edge (2) and the sealing lip (3) are all made of a new type of low-friction, high-wear-resistant rubber material, such as a composite material of hydrogenated nitrile rubber (HNBR) and polytetrafluoroethylene (PTFE). The piston body (1), the wavy sealing edge (2) and the sealing lip (3) are all coated with a nano-scale friction-reducing and noise-reducing coating.

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