Lightweight high-pressure-resistant concrete pump truck tail end hose

Abstract

The utility model discloses a light high-pressure-resistant concrete pump truck tail end hose, and relates to the technical field of concrete pump truck tail end hoses. Comprising a rubber hose inner rubber layer, a first aramid fiber thread winding layer, a first middle rubber layer, a second aramid fiber thread winding layer, a second middle rubber layer, a third aramid fiber thread winding layer, a third middle rubber layer, a fourth aramid fiber thread winding layer and a wear-resistant outer rubber layer which are sequentially fused from inside to outside. The novel pump truck tail end hose is formed between the rubber hose inner rubber layer and the wear-resistant outer rubber layer through staggered weaving of the three middle rubber layers and the four aramid fiber thread winding layers, and the novel pump truck tail end hose is used for being installed on a concrete pump truck and is light in mass and high in wear resistance. When the pouring position is changed, a worker can conveniently control the tail end hose to move so as to adjust the concrete pumping angle and position, the movement range of a pump truck can be reduced, and the site construction efficiency is improved; in addition, the concrete pumping construction environment can be better adapted, a hose at the tail end of the pump truck is prevented from being damaged due to abrasion in the moving and dragging process, and the service life is long.

Description

Technical Field

[0001] This utility model relates to the technical field of end hoses for concrete pump trucks, specifically to a lightweight, high-pressure resistant end hose for concrete pump trucks. Background Technology

[0002] In modern construction engineering, the higher the building, the more difficult the concrete pouring becomes, leading to the development of concrete pumping. Pumped concrete uses a concrete pump or pump truck to transport and pour concrete mixtures along delivery pipelines. It is an efficient method of concrete mixture transportation, offering speed and low labor intensity, making it particularly suitable for transporting and pouring large volumes of concrete and for high-rise buildings. The end hose, the rubber hose at the very end of the concrete pump truck's delivery pipe, serves as the tail end of the concrete delivery process, effectively reducing the pump truck's range of movement.

[0003] However, commonly used end hoses are made by winding steel wire or steel cord, resulting in a relatively heavy end hose. This makes moving the end hose difficult, and in construction environments where frequent dragging is required, the outer layer of the heavy traditional end hose wears more easily and is prone to damage. In addition, this type of end hose also swings more during use, leading to a higher risk of accidents. Utility Model Content

[0004] In view of one or more shortcomings of the prior art, the present invention provides a lightweight and high-pressure resistant concrete pump truck end hose, which reduces the weight of the hose, facilitates the movement of the end hose during pouring operations, reduces the difficulty of operation, and increases the burst pressure of the end hose, thereby improving the safety performance of the hose.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A lightweight, high-pressure resistant concrete pump truck end hose includes, from the inside out, an inner rubber layer, a first aramid fiber winding layer, a first intermediate rubber layer, a second aramid fiber winding layer, a second intermediate rubber layer, a third aramid fiber winding layer, a third intermediate rubber layer, a fourth aramid fiber winding layer, and a wear-resistant outer rubber layer.

[0007] As a further implementation, the first aramid yarn winding layer, the second aramid yarn winding layer, the third aramid yarn winding layer and the fourth aramid yarn winding layer are wound in opposite directions to form a braided structure.

[0008] As a further implementation, the first, second, and third intermediate rubber layers have the same structure, which is an intermediate rubber sheet with a thickness of 0.3-0.8 mm. The intermediate rubber sheet is made of natural rubber and styrene-butadiene rubber. The intermediate rubber sheet has good adhesion and flowability, and is easy to fill into the gaps of the cord, thereby increasing the adhesion between adjacent aramid cord winding layers.

[0009] As a further implementation, the mass ratio of natural rubber to styrene-butadiene rubber in the middle film is 30:70 to 50:50.

[0010] As a further implementation, the inner rubber layer of the rubber hose is made of natural rubber and butadiene rubber, and the hardness of the rubber material in the inner rubber layer of the rubber hose is 70-75.

[0011] As a further implementation, the thickness of the inner rubber layer of the rubber hose is 7-10 mm.

[0012] As a further implementation, the wear-resistant outer rubber layer is made of natural rubber and styrene-butadiene rubber, wherein the mass ratio of natural rubber to styrene-butadiene rubber is 20:80~40:60.

[0013] As a further implementation, the thickness of the wear-resistant outer adhesive layer is 3-5 mm.

[0014] As a further implementation, the wear-resistant outer rubber layer is wrapped with a water-repellent cloth before vulcanization to prevent the rubber tube from expanding excessively at the vulcanization temperature and to improve the degree of vulcanization of the rubber tube.

[0015] By adopting the above technical solution, the beneficial effects of this utility model are as follows:

[0016] 1. This utility model features a novel pump truck end hose formed by interlacing three layers of intermediate rubber and four layers of aramid yarn between the inner rubber layer and the wear-resistant outer rubber layer of the rubber hose. It is designed for installation on concrete pump trucks, is lightweight, and allows for easy manipulation by workers to adjust the concrete pumping angle and position when changing pouring locations. This reduces the pump truck's movement range and improves on-site construction efficiency. Furthermore, it better adapts to the concrete pumping environment, preventing wear and tear during movement and dragging, resulting in a long service life. Simultaneously, this utility model increases the burst pressure of the end hose, reducing deformation under operating pressure and ensuring the stability of the internal volume, thereby enhancing the safety performance of the end hose.

[0017] 2. This utility model fills the spaces between adjacent aramid thread winding layers with intermediate films, which increases the adhesion between layers, facilitates a tighter bond between layers, improves the overall integrity of the hose, and indirectly increases the burst pressure of the end hose. Attached Figure Description

[0018] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0019] Figure 1This is a schematic diagram of the structure of a lightweight, high-pressure resistant end hose for a concrete pump truck according to one or more embodiments of the present invention.

[0020] In the diagram: 1. Inner rubber layer of rubber hose; 2. First aramid fiber winding layer; 3. First intermediate rubber layer; 4. Second aramid fiber winding layer; 5. Second intermediate rubber layer; 6. Third aramid fiber winding layer; 7. Third intermediate rubber layer; 8. Fourth aramid fiber winding layer; 9. Wear-resistant outer rubber layer. Detailed Implementation

[0021] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0022] It should be noted that the terminology used herein is for descriptive purposes only and is not intended to limit the exemplary embodiments according to this invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0023] This utility model provides a concrete pump truck end hose for connection to a steel pump pipe. Located at the end of the concrete pump truck's delivery pipe, it is the final link in concrete delivery. During operation, no one is allowed to stand within the specified area of ​​the end hose accessory. The end hose must not be guided when the concrete pump truck starts pumping; otherwise, it may swing and injure people or cause safety accidents due to sprayed concrete. Therefore, the danger zone during pumping is the swing zone of the end hose, with a diameter generally twice the length of the end hose. The end hose must not be bent or submerged in concrete. Commonly used pump truck end hoses are made of steel cord or steel wire. Steel cord or steel wire has a high specific gravity, making the hose relatively heavy. In construction environments involving dragging, the outer layer experiences significant wear. Therefore, based on the shortcomings of existing pump truck end hoses and the performance requirements of end hoses at concrete delivery sites, this application provides a lightweight, high-pressure resistant concrete pump truck end hose structure in Embodiment 1, which can solve the existing technical problems.

[0024] Example 1

[0025] In one typical embodiment of this application, a lightweight, high-pressure resistant end hose for a concrete pump truck is provided, which is fixedly installed on the pipeline of the concrete pump truck via a connector during use. Figure 1 As shown, the pump truck end hose of this embodiment includes, from the inside out, a rubber hose inner layer 1, a first aramid yarn winding layer 2, a first middle rubber layer 3, a second aramid yarn winding layer 4, a second middle rubber layer 5, a third aramid yarn winding layer 6, a third middle rubber layer 7, a fourth aramid yarn winding layer 8, and a wear-resistant outer rubber layer 9. The above structures are coaxially arranged and fused into a whole by high-temperature vulcanization.

[0026] Specifically, the first aramid thread winding layer 2, the second aramid thread winding layer 4, the third aramid thread winding layer 6, and the fourth aramid thread winding layer 8 are identical, all made of 1670dtex 2×5 aramid thread. Preferably, in this embodiment, adjacent aramid thread winding layers are cross-wound, that is, the winding directions of the first aramid thread winding layer 2, the second aramid thread winding layer 4, the third aramid thread winding layer 6, and the fourth aramid thread winding layer 8 are in opposite directions, thus forming a tight braided structure. This reduces the weight of the end hose and increases the burst pressure of the hose, thereby effectively improving the safety performance of the end hose. Specifically, increasing the burst pressure of the end hose can reduce the deformation of the end hose under operating pressure, ensure the stability of the inner cavity volume, thereby reducing the wear of the material on the inner wall and helping to extend the service life of the end hose. If the burst pressure of the end hose is too low, the end hose will deform more under operating pressure, and the swing amplitude will also increase, resulting in a high risk factor. In addition, a low burst pressure also poses a risk of hose rupture.

[0027] It should be noted that aramid has a specific gravity that is 1 / 5 that of steel, while its strength is 2-5 times that of steel wire of the same diameter. In this embodiment, four layers of aramid wire are used as the reinforcing structure of the end hose. This not only greatly reduces the weight of the hose, making it easier to adjust the concrete pumping position by moving the end hose of the pump truck, thus reducing the movement of the concrete pump truck, but also increases the burst pressure of the hose, allowing the burst pressure to reach more than 300 bar, while the standard burst pressure is 200 bar. Therefore, it effectively ensures the safety performance of the hose, reduces the swaying of the end hose during concrete transportation and pouring, and avoids the possibility of injury caused by the swaying end hose. It also reduces the longitudinal and diameter changes of the end hose under pressure, keeping the end hose size stable, thereby reducing wear on the inner wall of the concrete and extending the service life of the end hose.

[0028] Specifically, to increase the adhesion between adjacent aramid yarn winding layers, a middle film is used to separate each pair of adjacent aramid yarn winding layers. For example... Figure 1As shown, a first intermediate rubber layer 3, a second intermediate rubber layer 5, and a third intermediate rubber layer 7 are respectively provided between two adjacent aramid thread winding layers. The first intermediate rubber layer 3, the second intermediate rubber layer 5, and the third intermediate rubber layer 7 have the same structure, all using an intermediate rubber sheet with a thickness of 0.3-0.8 mm. The intermediate rubber sheet is made of natural rubber and styrene-butadiene rubber, possessing good adhesion and flowability, and is easily filled into the gaps in the thread strands. In this embodiment, the intermediate rubber sheet used is made of natural rubber and styrene-butadiene rubber in a mass ratio of 30:70 to 50:50. Its good flowability allows it to fill the gaps in the aramid threads well, increasing the adhesion between layers and promoting a tighter bond between layers. This improves the overall integrity of the hose and indirectly increases the burst pressure of the end hose.

[0029] Specifically, the inner rubber layer 1 of the rubber hose is made of natural rubber and butadiene rubber in a mass ratio of 30:70~50:50, with a thickness of 7-10mm, a hardness of 70-75, a tensile strength ≥15Mpa, and an elongation at break ≥300%, thereby improving the wear resistance of the inner rubber layer of the rubber hose.

[0030] Specifically, the wear-resistant outer rubber layer 9 is located on the outermost layer of the end hose, with a thickness of 3-5mm. The rubber material of the wear-resistant outer rubber layer 9 is made of natural rubber and styrene-butadiene rubber in a mass ratio of 20:80~40:60, which gives it good wear resistance.

[0031] In this embodiment, to further improve the structural performance of the end hose, the wear-resistant outer rubber layer is wrapped with a water-resistant cloth before vulcanization. The water-resistant cloth has a tension of 7-10 kg, which can prevent the rubber tube from expanding excessively at the vulcanization temperature and improve the degree of vulcanization of the rubber tube.

[0032] The manufacturing process of the pump truck end hose in this embodiment is as follows:

[0033] Using a steel mandrel as a mold, a layer of release agent is evenly applied to the steel mandrel, making it easy to remove the mandrel after vulcanization.

[0034] Extrude a 7-10mm thick inner rubber layer into the rubber hose using an inner rubber extruder, cool it in a cooling water tank, and let it stand for 8-12 hours before use.

[0035] Four layers of aramid hard cord are sequentially and crosswise wound from the inside out to form a first aramid cord winding layer, a second aramid cord winding layer, a third aramid cord winding layer, and a fourth aramid cord winding layer. Each adjacent aramid cord winding layer is separated by a 0.3-0.8mm thick intermediate rubber sheet, forming a first intermediate rubber layer, a second intermediate rubber layer, and a third intermediate rubber layer, respectively.

[0036] Then wrap a 3-5mm thick wear-resistant outer rubber layer, and then wrap two layers of 0.3-0.4mm thick and 90-100mm wide water-resistant cloth with a tension of 7-10kg to prevent the rubber tube from expanding excessively at the vulcanization temperature, and at the same time improve the degree of vulcanization of the rubber tube.

[0037] Place the rubber tube covered with water-absorbing cloth in a vulcanizing tank at a temperature of 150-155℃ and a pressure of 0.47-0.5Mpa for 100-120 minutes, and then remove the water-absorbing cloth after cooling to room temperature.

[0038] Remove the mold to obtain a lightweight, high-pressure resistant concrete pump truck end hose.

[0039] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it. Those skilled in the art should understand that this utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A lightweight, high-pressure resistant end hose for a concrete pump truck, characterized in that, The device comprises, from the inside out, an inner rubber layer, a first aramid fiber winding layer, a first intermediate rubber layer, a second aramid fiber winding layer, a second intermediate rubber layer, a third aramid fiber winding layer, a third intermediate rubber layer, a fourth aramid fiber winding layer, and a wear-resistant outer rubber layer; all are coaxially arranged and fused together into a single unit through high-temperature vulcanization; the first, second, and third intermediate rubber layers have the same structure and are intermediate rubber sheets with a thickness of 0.3-0.8 mm; the wear-resistant outer rubber layer is located at the outermost layer of the end hose; the wear-resistant outer rubber layer is wrapped with a water-repellent cloth before vulcanization.

2. The lightweight, high-pressure resistant concrete pump truck end hose as described in claim 1, characterized in that, The first aramid yarn winding layer, the second aramid yarn winding layer, the third aramid yarn winding layer and the fourth aramid yarn winding layer are wound in opposite directions to form a braided structure.

3. The lightweight, high-pressure resistant concrete pump truck end hose as described in claim 1, characterized in that, The rubber compound in the inner layer of the rubber hose has a hardness of 70-75.

4. The lightweight, high-pressure resistant concrete pump truck end hose as described in claim 1, characterized in that, The thickness of the inner rubber layer of the rubber hose is 7-10mm.

5. The lightweight, high-pressure resistant concrete pump truck end hose as described in claim 1, characterized in that, The thickness of the wear-resistant outer adhesive layer is 3-5mm.

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