Method for manufacturing a concrete delivery pipe, concrete delivery pipe and pumping apparatus

Abstract

The application provides a concrete delivery pipe manufacturing method, a concrete delivery pipe and a pumping device, wherein the concrete delivery pipe manufacturing method comprises the following steps: manufacturing an inner pipe and a prefabricated outer pipe respectively, and setting the outer surface of the inner pipe and / or the inner surface of the prefabricated outer pipe as a rough surface; and the inner pipe is combined and arranged in the inner part of the prefabricated outer pipe, and an adhesive layer is arranged between the inner pipe and the prefabricated outer pipe, so as to form a double-layer adhesive concrete delivery pipe. The concrete delivery pipe manufacturing method, the concrete delivery pipe and the pumping device provided by the application can realize firm combination of the inner pipe and the outer pipe by arranging the adhesive layer between the inner pipe and the outer pipe and arranging the rough surface connected with the adhesive layer, can avoid the phenomenon of inner pipe falling, can reduce the phenomenon of pipe explosion and pipe blockage, can improve the overall pressure-bearing capacity of the delivery pipe, and can greatly reduce the risk of inner pipe cracking; and the delivery pipe has the advantages of simple structure, simple production process, easy realization, low cost and suitability for mass production.

Description

Technical Field

[0001] This invention relates to the field of conveying pipe technology, and in particular to a method for manufacturing a concrete conveying pipe, the concrete conveying pipe, and pumping equipment. Background Technology

[0002] Currently, with the widespread adoption of mechanized construction in urban development, road and bridge engineering, and other projects, concrete pumping devices such as trailer-mounted concrete pumps and concrete pump trucks have gradually become crucial equipment in mechanized concrete construction. Among these components, the concrete delivery pipe is a key factor affecting the service life and operational stability of the concrete pumping equipment. To mitigate the wear and tear on the inner wall of the pipe caused by the transported coarse concrete particles, the inner wall of the concrete delivery pipe needs to possess high hardness and wear resistance; simultaneously, to prevent cracks caused by external impacts during transportation or operation, the outer wall of the concrete delivery pipe needs to possess a certain degree of toughness.

[0003] Existing technology discloses combining steel pipes of different materials to obtain a double-layer concrete conveying pipe with good hardness and wear resistance of the inner pipe and good toughness and compressive strength of the outer pipe. In existing double-layer composite conveying pipe structures, the outer pipe encloses the inner pipe, inevitably resulting in a certain gap between the inner and outer pipes. Pressure on the inner pipe cannot be effectively transmitted to the outer pipe. During concrete conveying, the inner pipe is subjected to concrete impact, which can easily cause cracking and chipping, leading to pipe bursts and blockages. This results in pump truck downtime for repairs and replacement of damaged parts, delaying the construction schedule. Summary of the Invention

[0004] This invention provides a method for manufacturing a concrete conveying pipe, a concrete conveying pipe, and a pumping device, in order to solve the problem in the prior art where the inner pipe of a double-layer composite conveying pipe is easily damaged by concrete impact, leading to cracking and chipping of the inner pipe and thus reducing the risk of cracking and damage to the conveying pipe.

[0005] This invention provides a method for manufacturing a concrete conveying pipe, the method comprising: manufacturing an inner pipe and a precast outer pipe respectively, and setting the outer surface of the inner pipe and / or the inner surface of the precast outer pipe as rough surfaces; compositely setting the inner pipe inside the precast outer pipe, and setting an adhesive layer between the inner pipe and the precast outer pipe to form a double-layered sandwiched concrete conveying pipe.

[0006] According to the concrete conveying pipe manufacturing method provided by the present invention, setting the outer surface of the inner pipe and / or the inner surface of the precast outer pipe as a rough surface specifically includes: forming a rough surface on the outer surface of the inner pipe by centrifugal casting; or forming a rough surface on the outer surface of the inner pipe and / or the inner surface of the precast outer pipe by shot peening or machining.

[0007] According to the concrete conveying pipe manufacturing method provided by the present invention, the inner pipe is compositely disposed inside the precast outer pipe, and an adhesive layer is disposed between the inner pipe and the precast outer pipe. Specifically, when the concrete conveying pipe is a straight pipe or a reducing pipe, an adhesive layer is pre-coated on the outer surface of the inner pipe, and then the precast outer pipe is sleeved on; or, the precast outer pipe is sleeved on the outside of the inner pipe, and then an adhesive layer is filled between the inner pipe and the precast outer pipe; when the concrete conveying pipe is a bent pipe, the precast outer pipe is sleeved on the outside of the inner pipe, and then an adhesive layer is filled between the inner pipe and the precast outer pipe.

[0008] According to the concrete conveying pipe manufacturing method provided by the present invention, the pre-coating of an adhesive layer on the outer surface of the inner pipe specifically includes: pre-coating an adhesive layer on the outer surface of the inner pipe such that the thickness of the pre-coated adhesive layer is greater than the target thickness of the adhesive layer.

[0009] According to the concrete conveying pipe manufacturing method provided by the present invention, when the concrete conveying pipe is a straight pipe or a reducing pipe, the inner diameter of the prefabricated outer pipe is larger than the target inner diameter; when the concrete conveying pipe is a bent pipe, the inner diameter of the prefabricated outer pipe is the same as the target inner diameter; when the concrete conveying pipe is a straight pipe or a reducing pipe, the manufacturing method further includes: after the inner pipe is compositely disposed inside the prefabricated outer pipe and an adhesive layer is provided between the inner pipe and the prefabricated outer pipe, the prefabricated outer pipe is shaped by a drawing or rolling process to form a shaped outer pipe with an inner diameter consistent with the target inner diameter.

[0010] According to the concrete conveying pipe manufacturing method provided by the present invention, the manufacturing method further includes: cutting a conveying pipe segment of a target length from the formed double-layer laminated concrete conveying pipe; connecting flanges to both ends of the conveying pipe segment respectively; and assembling wear-resistant sleeves at both ends of the conveying pipe segment respectively to form a finished conveying pipe.

[0011] The present invention also provides a concrete conveying pipe, comprising: an inner pipe and an outer pipe sleeved on the inner pipe, wherein the outer surface of the inner pipe and / or the inner surface of the outer pipe are provided as rough surfaces, and an adhesive layer is provided between the inner pipe and the outer pipe.

[0012] According to the concrete conveying pipe provided by the present invention, the outer surface of the inner pipe and / or the inner surface of the outer pipe are provided with a textured structure to form the rough surface, the textured structure including at least one of beveled texture and grid texture; or, the outer surface of the inner pipe and / or the inner surface of the outer pipe are provided with an uneven structure to form the rough surface.

[0013] According to the concrete conveying pipe provided by the present invention, a hexagonal mesh structure is further provided between the inner pipe and the outer pipe, and the mesh of the hexagonal mesh structure is filled with the adhesive layer.

[0014] The present invention also provides a pumping device, including the above-mentioned concrete conveying pipe.

[0015] The concrete conveying pipe manufacturing method, concrete conveying pipe, and pumping equipment provided by this invention achieve a firm composite of the inner and outer pipes by setting an adhesive layer between the inner and outer pipes and setting a rough surface to connect with the adhesive layer. This can avoid the phenomenon of the inner pipe falling off pieces, reduce the occurrence of pipe bursting and blockage, improve the overall pressure bearing capacity of the conveying pipe, and significantly reduce the risk of inner pipe cracking. Moreover, the conveying pipe setting scheme has a simple structure, the production process is simple and easy to implement, the cost is low, and it is suitable for mass production. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the concrete conveying pipe manufacturing method provided by the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of the concrete conveying pipe provided by the present invention;

[0019] Figure 3 This invention provides Figure 2 A magnified view of part A in the middle;

[0020] Figure 4 This is a schematic diagram of the beveled texture provided by the present invention;

[0021] Figure 5 This is a schematic diagram of the mesh pattern provided by the present invention;

[0022] Figure 6 This is a schematic diagram of the tortoise shell mesh structure provided by the present invention;

[0023] Figure 7 This is a first schematic diagram of the tortoise shell mesh structure provided by the present invention;

[0024] Figure 8 This is a second schematic diagram of the tortoise shell mesh structure provided by the present invention;

[0025] Figure 9 This is a schematic diagram of the structure of the variable diameter pipe provided by the present invention;

[0026] Figure 10 This is a schematic diagram of the structure of the bent pipe provided by the present invention;

[0027] Figure label:

[0028] 1: Flange; 2: Wear-resistant sleeve; 3: Outer pipe;

[0029] 4: Inner tube; 5: Adhesive layer; 6: Tortoise shell mesh structure;

[0030] 61: Quadrilateral tortoise shell mesh; 62: Hexagonal tortoise shell mesh; 71: Beveled pattern;

[0031] 72: Grid pattern; 8: Round hole. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0033] The following is combined with Figures 1 to 10 The present invention describes a method for manufacturing a concrete conveying pipe, the concrete conveying pipe, and a pumping device.

[0034] refer to Figure 1 This embodiment provides a method for manufacturing a concrete conveying pipe. The method includes: manufacturing an inner pipe 4 and a precast outer pipe respectively, and setting the outer surface of the inner pipe 4 and / or the inner surface of the precast outer pipe as rough surfaces; compositely setting the inner pipe 4 inside the precast outer pipe, and setting an adhesive layer 5 between the inner pipe 4 and the precast outer pipe to form a double-layered sandwiched concrete conveying pipe.

[0035] The concrete conveying pipe manufacturing method is as follows: first, an inner pipe 4 and a precast outer pipe are manufactured, and a rough surface is formed on the outer surface of the inner pipe 4 and / or the inner surface of the precast outer pipe according to the actual manufacturing process and the needs of the conveying pipe; then, the inner pipe 4 and the precast outer pipe are combined into an integral conveying pipe structure by bonding adhesive layer 5.

[0036] This embodiment achieves a strong bond between the inner tube 4 and the outer tube by setting an adhesive layer 5 between the inner tube 4 and the outer tube, and setting a rough surface to connect with the adhesive layer 5. This can prevent the inner tube 4 from falling off, reduce the occurrence of pipe bursting and blockage, and improve the overall pressure bearing capacity of the conveying pipe, significantly reducing the risk of cracking of the inner tube 4. Moreover, this conveying pipe setting scheme has a simple structure, a simple and easy-to-implement production process, and low cost, making it suitable for mass production.

[0037] Based on the above embodiments, further, setting the outer surface of the inner tube 4 and / or the inner surface of the prefabricated outer tube as a rough surface specifically includes: forming a rough surface on the outer surface of the inner tube 4 by centrifugal casting; or forming a rough surface on the outer surface of the inner tube 4 and / or the inner surface of the prefabricated outer tube by shot peening or machining.

[0038] Specifically, the inner tube 4 can be formed by centrifugal casting of wear-resistant high-chromium cast iron. When the outer surface of the inner tube 4 is to be roughened, the rough surface can be formed integrally during the centrifugal casting process, or the inner tube 4 can be formed first by centrifugal casting, and then the rough surface can be formed on the outer surface of the inner tube 4 by shot peening or machining. The outer tube 3 is made of high-toughness low-carbon steel or low-carbon alloy steel. When the inner surface of the outer tube 3 is to be roughened, the outer tube 3 can be manufactured first, and then the rough surface can be formed on the inner surface of the outer tube 3 by shot peening or machining.

[0039] Furthermore, the process for setting the rough surface can also be other, with the aim of forming a rough surface with a preset roughness, and there is no specific limitation.

[0040] Furthermore, the specific process parameters for shot peening to form a rough surface are as follows: nozzle pressure: 6-8 MPa; particle diameter: 1-2 mm; nozzle distance: 150-250 mm; blasting angle: 60-80°. This embodiment provides a specific range of process parameters for shot peening to form a rough surface. Shot peening within this parameter range can efficiently and effectively form the required rough surface on the outer surface of the inner tube 4 and / or the inner surface of the outer tube 3 without damaging the pipe body. This range of process parameters is highly efficient and practical.

[0041] Based on the above embodiments, further, the inner tube 4 is compositely disposed inside the prefabricated outer tube, and an adhesive layer 5 is provided between the inner tube 4 and the prefabricated outer tube. Specifically, when the concrete conveying pipe is a straight pipe or a reducing pipe, the adhesive layer 5 is pre-coated on the outer surface of the inner tube 4, and then the prefabricated outer tube is sleeved on; or, the prefabricated outer tube is sleeved on the outside of the inner tube 4, and then the adhesive layer 5 is filled between the inner tube 4 and the prefabricated outer tube; when the concrete conveying pipe is a bent pipe, the prefabricated outer tube is sleeved on the outside of the inner tube 4, and then the adhesive layer is filled between the inner tube 4 and the prefabricated outer tube.

[0042] There are two methods for setting the adhesive layer 5. The first method is to first apply the adhesive layer 5 to the outer surface of the inner pipe 4, and then fit the precast outer pipe around it. The second method is to first fit the precast outer pipe around the inner pipe 4, and then fill the gap between the inner pipe 4 and the precast outer pipe with the adhesive layer 5. Both methods are acceptable when the concrete conveying pipe is a straight pipe or a reducing pipe; there is no specific limitation. When the concrete conveying pipe is a bent pipe, the second method can be used to set the adhesive layer 5 for ease of installation.

[0043] Based on the above embodiments, further, the pre-coating of the adhesive layer 5 on the outer surface of the inner tube 4 specifically includes: pre-coating the adhesive layer 5 on the outer surface of the inner tube 4 such that the thickness of the pre-coated adhesive layer 5 is greater than the target thickness of the adhesive layer 5.

[0044] When the concrete conveying pipe is a straight pipe or a reducing pipe, and the adhesive layer 5 is pre-coated on the outer surface of the inner pipe 4, a thicker adhesive layer can be applied. For example, when the target thickness of the adhesive layer 5 is 1 mm, that is, when the target thickness of the adhesive layer 5 in the final conveying pipe product is 1 mm, a 1.5 or 2 mm thick adhesive layer can be applied when pre-coating the adhesive layer 5 on the outer surface of the inner pipe 4.

[0045] Because some adhesive will be squeezed out during the subsequent installation of the prefabricated outer tube and the formation of the finished conveying pipe, a thicker adhesive layer can be pre-applied to ensure the thickness of the adhesive layer 5 in the finished conveying pipe. Furthermore, the compression of the pre-applied adhesive layer is also conducive to the uniform and dense distribution of the adhesive layer 5 between the inner tube 4 and the outer tube 3.

[0046] Further, the pre-coating of the adhesive layer 5 on the outer surface of the inner tube 4 specifically includes: controlling the inner tube 4 to rotate axially, and the adhesive application assembly moving along the axis of the inner tube 4 on the outside of the inner tube 4 to pre-apply adhesive. This embodiment provides a detailed description of the process of pre-coating the adhesive layer 5 on the outer surface of the inner tube 4. That is, the adhesive application assembly is located on the outside of the inner tube 4, corresponding to the outer surface of the inner tube 4. The adhesive application assembly can be controlled to gradually move from one end of the inner tube 4 to the other end axially to apply adhesive, while simultaneously controlling the inner tube 4 to rotate axially, thereby achieving uniform pre-coating of the adhesive layer 5 on the outer surface of the inner tube 4.

[0047] The adhesive application assembly specifically includes: an adhesive tube for storing adhesive and controlling adhesive dispensing; and an adhesive pressure plate located at the dispensing end of the adhesive tube, which is positioned opposite to the area to be coated so that the adhesive is dispensed between the area to be coated and the adhesive pressure plate.

[0048] Furthermore, the specific process parameters for pre-coating the adhesive layer 5 on the outer surface of the inner tube 4 are as follows: the distance between the adhesive application plate of the adhesive application assembly and the outer surface of the inner tube 4 is 0.8-1.2 mm; the adhesive application pressure is 6-8 MPa; the rotation speed of the inner tube 4 is 250-350 r / min; and the moving speed of the adhesive application tube of the adhesive application assembly is 0.6-1 m / min. The adhesive application pressure is the pressure used to control the dispensing of adhesive within the adhesive application tube. The specific settings of each process parameter during this pre-coating process can effectively and uniformly form the adhesive layer 5 on the outer surface of the inner tube 4. The formed adhesive layer 5 has good density, is suitable for the manufacture of conveying pipes, and can achieve a strong bond between the inner tube 4 and the outer tube 3.

[0049] Based on the above embodiments, further, when the concrete conveying pipe is a straight pipe or a reducing pipe, the inner diameter of the prefabricated outer pipe is larger than the target inner diameter; when the concrete conveying pipe is a bend, the inner diameter of the prefabricated outer pipe is the same as the target inner diameter. When the concrete conveying pipe is a straight pipe or a reducing pipe, the manufacturing method further includes: after the inner pipe 4 is compositely disposed inside the prefabricated outer pipe, and an adhesive layer 5 is provided between the inner pipe 4 and the prefabricated outer pipe, the prefabricated outer pipe is shaped by a drawing or rolling process to form a shaped outer pipe 3 with an inner diameter consistent with the target inner diameter.

[0050] When the concrete conveying pipe is a straight pipe or a reducing pipe, a precast outer pipe with a larger inner diameter can be installed. For example, when the target inner diameter of the outer pipe 3 in the finished conveying pipe is 132mm, the inner diameter of the precast outer pipe can be set to 134mm.

[0051] Setting a larger prefabricated outer tube allows for a thicker initial filling adhesive layer, which enables the subsequent formation of an outer tube 3 with a preset inner diameter to form the finished conveying pipe. During the formation of the finished conveying pipe, some adhesive is squeezed out, ensuring the thickness of the adhesive layer 5 in the finished conveying pipe. Furthermore, the initial filling adhesive layer being squeezed also facilitates the uniform and dense distribution of the adhesive layer 5 between the inner tube 4 and the outer tube 3.

[0052] Furthermore, the difference between the inner diameter of the prefabricated outer tube and the target inner diameter of the outer tube 3 in the finished delivery pipe is 1-5 mm.

[0053] Furthermore, when the concrete conveying pipe is a straight pipe or a reducing pipe, the precast outer pipe with a larger inner diameter is processed into a shaped outer pipe 3 by drawing or rolling. This process reduces the inner diameter of the precast outer pipe 3, which can compress the adhesive layer 5 between the inner pipe 4 and the outer pipe 3, so that the adhesive layer 5 is evenly and densely filled between the inner and outer pipes 3.

[0054] Furthermore, the specific setting scheme for the preset thickness of the adhesive layer 5 is as follows: the larger the preset inner diameter of the inner tube 4 in the finished delivery pipe, the larger the preset thickness of the adhesive layer 5. That is, as the preset inner diameter of the inner tube 4 increases, the preset thickness of the adhesive layer 5 can be increased accordingly to ensure the connection is firm.

[0055] Based on the above embodiments, the manufacturing method further includes: cutting a conveying pipe segment of a target length from the formed double-layer laminated concrete conveying pipe; connecting flanges 1 to both ends of the conveying pipe segment respectively; and assembling wear-resistant sleeves 2 at both ends of the conveying pipe segment respectively to form a finished conveying pipe.

[0056] The manufacturing process involves first creating a relatively long pipe blank during concrete conveying pipe production. During use, a section of the required length is cut from the pipe blank. A flange 1 is connected to the end of each pipe section for external connection, and a wear-resistant sleeve 2 is then assembled to form the finished conveying pipe. In this process, the pipe blank is longer than the required finished pipe length, allowing for flush alignment of the inner pipe 4, outer pipe 3, and adhesive layer 5 at both ends of the conveying pipe, ensuring quality. This manufacturing step is suitable for straight and reducing concrete conveying pipes. When the concrete conveying pipe is bent, an inner pipe and a prefabricated outer pipe with dimensions matching the finished pipe can be directly formed. The prefabricated outer pipe is then fitted over the inner pipe, followed by the installation of flanges and wear-resistant sleeves. Finally, an adhesive layer is filled between the inner and outer pipes to form the finished conveying pipe.

[0057] refer to Figure 2 and Figure 3 This embodiment provides a concrete conveying pipe based on the above-described concrete conveying pipe manufacturing method. The concrete conveying pipe includes an inner pipe 4 and an outer pipe 3 sleeved on the inner pipe 4. The outer surface of the inner pipe 4 and / or the inner surface of the outer pipe 3 are roughened, and an adhesive layer 5 is filled between the inner pipe 4 and the outer pipe 3.

[0058] This embodiment provides a concrete conveying pipe. By filling and setting an adhesive layer 5 between the inner pipe 4 and the outer pipe 3, the inner pipe 4 and the outer pipe 3 are combined to form an integral pipe through the adhesive layer 5. When the conveying pipe is impacted, the inner pipe 4 can better transmit pressure to the outer pipe 3, thereby improving the pressure bearing capacity of the conveying pipe and significantly reducing the risk of cracking. At the same time, the intermediate adhesive layer 5 has strong bonding strength, which can prevent the conveying pipe from bursting or blocking due to the inner pipe 4 falling off.

[0059] Furthermore, this embodiment also proposes to provide a rough surface on the outer surface of the inner tube 4 and / or the inner surface of the outer tube 3. The rough surface is a surface with an uneven structure. By providing a rough surface, the contact area between the inner tube 4 and / or the outer tube 3 and the adhesive layer 5 can be increased. At the same time, the rough surface is conducive to the storage of the adhesive layer 5, increases the bonding force between the inner and outer tubes 3, and makes the inner tube 4 and the outer tube 3 firmly bonded together as a whole.

[0060] This embodiment achieves a strong bond between the inner tube 4 and the outer tube 3 by setting an adhesive layer 5 between the inner tube 4 and the outer tube 3 and setting a rough surface to connect with the adhesive layer 5. This can prevent the inner tube 4 from falling off, reduce the occurrence of pipe bursts and blockages, improve the overall pressure resistance of the conveying pipe, and significantly reduce the risk of cracking of the inner tube 4. Moreover, this conveying pipe setting scheme has a simple structure, a simple and easy-to-implement production process, and low cost, making it suitable for mass production.

[0061] Specifically, the outer surface of the inner tube 4 can be set to a rough surface to improve the bonding strength between the inner tube 4 and the adhesive layer 5; the inner surface of the outer tube 3 can also be set to a rough surface to improve the bonding strength between the outer tube 3 and the adhesive layer 5; or both the outer surface of the inner tube 4 and the inner surface of the outer tube 3 can be set to rough surfaces to improve the bonding strength between the inner tube 4 and the adhesive layer 5 as well as between the outer tube 3 and the adhesive layer 5.

[0062] Furthermore, the rough surface is formed by processes such as casting, wire drawing, machining, or shot peening.

[0063] Based on the above embodiments, preferably, in this embodiment, the rough surface is provided on the outer surface of the inner tube 4. The outer surface of the inner tube 4 can be roughened by processes such as casting and shot peening. There are many applicable processes for setting the outer surface as a rough surface, which facilitates the setting of the rough surface.

[0064] Based on the above embodiments, further, the end faces of the adhesive layer 5, the inner tube 4, and the outer tube 3 are flush. That is, the adhesive layer 5 fills the space between the inner tube 4 and the outer tube 3 until it is flush with the end faces, so that the adhesive layer 5 fully fills the space between the two ends of the gap between the inner tube 4 and the outer tube 3. Any part between the inner tube 4 and the outer tube 3 is connected by the adhesive layer 5, which helps to improve the firmness of the composite of the inner tube 4 and the outer tube 3.

[0065] Furthermore, a longer conveying pipe blank can be manufactured first, namely, a longer inner tube 4, an outer tube 3, and a rough surface. An adhesive layer 5 is then filled between the longer inner tube 4 and the outer tube 3 to form the conveying pipe blank. The required length of conveying pipe is then cut from the conveying pipe blank. The inner tube 4, outer tube 3, and adhesive layer 5 at both ends of the cut conveying pipe are flush.

[0066] Based on the above embodiments, further, referring to Figure 4 and Figure 5 In this embodiment, the outer surface of the inner tube 4 and / or the inner surface of the outer tube 3 are provided with a textured structure to form the rough surface. The textured structure includes at least one of beveled texture 71 and mesh texture 72. That is, in this embodiment, adding texture to the outer surface of the inner tube 4 can be achieved by machining the corresponding texture on the surface of a centrifugal casting mold; and / or, adding texture to the inner surface of the outer tube 3 can be achieved by machining the corresponding texture on the inner surface of the outer tube 3 through wire drawing, machining, or other methods. The texture shape can be beveled texture 71 or mesh texture 72. Adding different forms of texture to the outer surface of the inner tube 4 and / or the inner surface of the outer tube 3 increases the bonding area between the inner and outer tubes and the adhesive layer, thereby improving the adhesive strength.

[0067] Further, refer to Figure 4 The beveled texture 71 includes multiple parallel ribs; parallel rib structures can be provided on the outer surface of the inner tube 4 and / or the inner surface of the outer tube 3 to form the beveled texture 71. (Reference) Figure 5 The grid pattern 72 includes a first rib and a second rib that are parallel to each other. The first rib and the second rib intersect to form a grid. The intersecting rib structure can be provided on the outer surface of the inner tube 4 and / or the inner surface of the outer tube 3 to form the grid pattern 72.

[0068] Furthermore, in another embodiment, the outer surface of the inner tube 4 and / or the inner surface of the outer tube 3 are provided with an uneven structure to form the rough surface. That is, in this embodiment, regular or irregular uneven structures can be provided to form the rough surface. The uneven structure means that the outer surface of the inner tube 4 and / or the inner surface of the outer tube 3 are uneven, and the surface can have regular or irregular pits and protrusions, and the specific shape of the protrusions is not limited. The uneven structure can be formed by centrifugal casting or shot peening.

[0069] Furthermore, the roughness of the uneven structure is Ra25-Ra200μm. A rough surface within this range is manufactured on the outer surface of the inner tube 4 and / or the inner surface of the outer tube 3. This roughness range is compatible with commonly used conveying pipe inner diameter and wall thickness dimensions in engineering. It is suitable for commonly used inner diameter dimensions, allowing for a firm connection with the adhesive layer 5 under this roughness, thus achieving a strong composite of the inner tube 4 and the outer tube 3; it is also suitable for wall thickness dimensions, without affecting the inherent strength of the inner tube 4 and / or the outer tube 3. This roughness range is suitable for the conveying pipe structure provided in this embodiment, and it facilitates manufacturing processes.

[0070] Based on the above embodiments, further, referring to Figure 6A hexagonal mesh structure 6 is also provided between the inner tube 4 and the outer tube 3, and the mesh of the hexagonal mesh structure 6 is filled with the adhesive layer 5. To improve the bonding strength between the inner and outer tubes, a polygonal hexagonal mesh is first arranged between the inner and outer tubes; the hexagonal mesh material includes, but is not limited to, carbon steel, alloy steel, aluminum alloy, nylon, rubber, fiber, etc. Specifically, the hexagonal mesh structure 6 can be first wrapped around the outer surface of the inner tube 4, then the adhesive is applied and filled into the hexagonal mesh, and then the outer tube is inserted. After the outer tube is drawn or rolled, the inner and outer tubes are tightly bonded to the adhesive.

[0071] For details, please refer to Figure 7 The tortoise shell mesh structure 6 can be a quadrilateral tortoise shell mesh 61; see reference. Figure 8 The tortoise shell structure 6 can also be a hexagonal tortoise shell structure 62; the specific form of the tortoise shell structure 6 can also be other, and no specific limitation is made.

[0072] Furthermore, the thickness of the hexagonal mesh structure 6 is less than the thickness of the adhesive layer 5, and the hexagonal mesh structure 6 is spot-welded to the outer surface of the inner tube 4 or the inner surface of the outer tube 3. Providing the hexagonal mesh structure 6 between the inner tube 4 and the outer tube 3 can improve the bonding strength; the thickness of the hexagonal mesh structure 6 can be set to be less than the thickness of the adhesive layer 5, allowing the adhesive layer 5 to fully contact the outer surface of the inner tube 4 and / or the inner surface of the outer tube 3, thereby improving the composite strength of the inner and outer tubes; when the thickness of the hexagonal mesh structure 6 is less than the thickness of the adhesive layer 5, the hexagonal mesh structure 6 can be connected to the outer surface of the inner tube 4 or the inner surface of the outer tube 3 to improve the firmness and stability of the hexagonal mesh structure 6.

[0073] Based on the above embodiments, the thickness of the adhesive layer 5 is further defined as 0.05-5 mm. The thickness of the adhesive layer 5 refers to the maximum thickness of the adhesive layer 5 between the inner tube 4 and the outer tube 3. For example, when the outer surface of the inner tube 4 is set as a rough surface, the thickness of the adhesive layer 5 refers to the distance between the deepest point of the rough surface and the inner surface of the outer tube 3.

[0074] The thickness range of the adhesive layer 5 is compatible with the commonly used conveying pipe size in engineering. It is suitable for the commonly used conveying pipe size so that the inner pipe 4 and the outer pipe 3 can be firmly bonded under the thickness of the adhesive layer 5. It is also suitable for the weight and cost requirements of the conveying pipe. The thickness is moderate and will not be too thick, which would cause the conveying pipe to be too heavy and the cost to be too high.

[0075] Based on the above embodiments, the concrete conveying pipe provided in this embodiment further includes a flange 1, and the outer wall of the outer pipe 3 is connected to the flange 1. Flanges 1 are connected to both ends of the outer pipe 3 for the installation and connection of the conveying pipe.

[0076] The concrete conveying pipe also includes a wear-resistant sleeve 2, which is connected to the inner wall of the flange 1; the end face of the wear-resistant sleeve 2 is in contact with the end face of the adhesive layer 5. The end face of the wear-resistant sleeve 2 is simultaneously in contact with the end faces of the inner pipe 4 and the outer pipe 3; the inner surface of the wear-resistant sleeve 2 is flush with the inner surface of the inner pipe 4. The wear-resistant sleeve 2 can be connected to the flange 1 with an interference fit, or it can be connected in other ways, which are not limited. By welding flanges 1 to both ends of the conveying pipe and assembling wear-resistant sleeves 2, a concrete conveying pipe with excellent wear resistance, strong impact load resistance, certain corrosion resistance, and high safety performance under pressure pulsation conditions is obtained.

[0077] Furthermore, the adhesive layer 5 includes a resin structural adhesive layer, a polyurethane adhesive layer, or a modified silane adhesive layer. The inner tube 4 is a centrifugally cast high-chromium cast iron tube, and the outer tube 3 is a low-carbon steel tube or a low-carbon alloy steel tube.

[0078] Based on the above embodiments, this embodiment further provides a pumping device, which includes the concrete conveying pipe described in any of the above embodiments. Specifically, the pumping device includes a concrete pump truck, etc.

[0079] Based on the above embodiments, further, due to the lack of bonding force between the inner and outer pipes 3 of the existing concrete composite conveying pipe, and the fact that the outer pipe 3 simply wraps around the inner pipe 4, the inner pipe 4 is prone to cracking and falling off after cracking; and there will be a certain gap between the inner and outer pipes 3, so when the inner pipe 4 is subjected to pressure, it cannot be effectively transmitted to the outer pipe 3, and when the conveying pipe is subjected to concrete impact, it is easy to cause the inner pipe 4 to crack and burst. In addition, in a few cases, the production cost of using local pressure welding and brazing processes to achieve the bonding of the inner and outer pipes 3 is too high and is not suitable for mass production and application.

[0080] This embodiment proposes a double-layer composite pipe structure suitable for pumped concrete transportation. The outer pipe 3 is generally made of high-toughness low-carbon steel or low-carbon alloy steel, while the inner pipe 4 is generally made of hard and brittle materials such as 65Mn, 55Mn, or GCr series bearing steel. An adhesive layer 5 is set between the inner pipe 4 and the outer pipe 3 to achieve a composite structure of the inner and outer pipes 3. Furthermore, considering that the bearing steel is made of seamless steel or welded pipe with a very smooth surface due to rolling, it is not easy to store adhesive, resulting in weak bonding between the inner and outer pipes 3. Therefore, this embodiment further proposes to set a rough surface on the outer surface of the inner pipe 4 and / or the inner surface of the outer pipe 3 to strengthen the bond with the adhesive layer 5.

[0081] Specifically, this embodiment provides a double-layer laminated composite concrete conveying pipe, comprising: a flange 1, a wear-resistant sleeve 2, an outer pipe 3, an inner pipe 4, and an adhesive layer 5. This embodiment mainly involves filling the space between the inner pipe 4 and the outer pipe 3 with an adhesive layer 5, the thickness of which ranges from 0.05 to 5 mm; the adhesive type is resin structural adhesive, polyurethane adhesive, or modified silane adhesive. The inner pipe 4 is centrifugally cast wear-resistant high-chromium cast iron, and the outer pipe 3 is made of high-toughness low-carbon steel or low-carbon alloy steel. The inner tube 4, made of high-chromium cast iron, has a rough and clean outer surface obtained through centrifugal casting and shot peening. The inner tube 4 and the outer tube 3 are tightly bonded together by the adhesive layer, and the gap between the inner and outer tubes 3 is filled to form a composite integral tube. When the conveying pipe is impacted, the inner tube 4 can effectively transmit pressure to the high-toughness outer tube 3, improving the pressure resistance of the conveying pipe and significantly reducing the risk of cracking. At the same time, the intermediate adhesive layer 5 has strong bonding strength, which can prevent the conveying pipe from bursting or blocking due to the inner tube 4 falling off.

[0082] When the concrete delivery pipe is a straight pipe, in the case of a double-layer laminated composite pipe, such as Figure 1 and Figure 2 In the manufacturing process shown, centrifugally cast high-chromium cast iron is used as the inner tube 4. The surface of the inner tube 4 is shot-blasted to obtain a rough and clean outer surface. Then, after the outer surface of the inner tube 4 is pre-coated with adhesive layer 5, it is combined with the outer tube 3. The outer tube 3 is shaped by drawing or rolling to make the inner and outer tubes 3 tightly bonded. Finally, the outer tube 3 is welded to the flange 1 and the wear-resistant sleeve 2 is installed.

[0083] Besides straight conveying pipes, double-layer laminated concrete conveying pipe structures can also be used in reducing pipes and bends. (Reference) Figure 9 In the manufacturing of reducing pipes, wear-resistant materials such as high-chromium cast iron, 65Mn, 55Mn, ceramics, and hard alloys are used as inner tubes 4. After the outer surface of the inner tube 4 is pre-coated with adhesive 5, it is combined with the outer tube 3. The outer tube 3 is drawn and shaped, then the wear-resistant sleeve 2 is press-fitted, and finally the outer tube is welded to the flange 1.

[0084] refer to Figure 10 In the manufacturing of double-layer laminated composite bends, a round hole 8 is first drilled in the outer tube 3. Then, the inner tube 4 is laminated with the outer tube 3. After pressing in the wear-resistant sleeve 2 and welding the flange 1, the adhesive is injected into the gap between the inner tube 4 and the outer tube 3 using a high-pressure glue injection machine in the round hole 8 of the outer tube 3. Finally, the round hole 8 is welded and sealed.

[0085] This double-layered laminated concrete conveying pipe utilizes the adhesive force of the bonding agent to effectively bond the inner pipe 4 and the outer pipe 3, forming a composite integral pipe. This eliminates the possibility of the inner pipe 4 chipping, reducing the occurrence of pipe bursts and blockages. The adhesive filling between the inner and outer pipes 4 eliminates gaps, allowing the inner pipe 4 to better transmit pressure when subjected to impact, improving the overall pressure-bearing capacity of the conveying pipe and significantly reducing the risk of cracking. The inner pipe 4 is made of centrifugally cast high-chromium cast iron, which has at least twice the wear resistance of conventional spring steel and GCr series bearing steel. The inner pipe 4 undergoes centrifugal casting and shot peening to obtain a rough and clean outer surface, increasing the contact area between the inner pipe 4 and the adhesive layer. Simultaneously, the rough surface facilitates adhesive retention, increasing the bonding strength between the inner and outer pipes 3.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A concrete conveying pipe, characterized in that, It includes: an inner tube and an outer tube sleeved on the inner tube, wherein the outer surface of the inner tube and / or the inner surface of the outer tube are rough surfaces, and an adhesive layer is filled between the inner tube and the outer tube; the preset thickness of the adhesive layer is set such that the larger the preset inner diameter of the inner tube, the larger the preset thickness of the adhesive layer. A tortoise shell mesh structure is also provided between the inner tube and the outer tube, and the mesh of the tortoise shell mesh structure is filled with the adhesive layer; the tortoise shell mesh structure is a quadrilateral tortoise shell mesh or a hexagonal tortoise shell mesh; The outer surface of the inner tube and / or the inner surface of the outer tube are provided with a textured structure to form the rough surface, the textured structure including at least one of beveled texture and grid texture; or, the outer surface of the inner tube and / or the inner surface of the outer tube are provided with an uneven structure to form the rough surface. When the concrete delivery pipe is a straight pipe or a reducing pipe, the inner diameter of the outer pipe is larger than the target inner diameter; The method for manufacturing the concrete conveying pipe includes: An inner tube and an outer tube are manufactured separately, and the outer surface of the inner tube and / or the inner surface of the outer tube are made into rough surfaces; The inner tube is compositely disposed inside the outer tube, and an adhesive layer is disposed between the inner tube and the outer tube to form a double-layer laminated concrete conveying pipe. The outer surface of the inner tube is first covered with a tortoise shell mesh structure, then the glue is applied and filled into the tortoise shell mesh structure, and then the outer tube is inserted. After the outer tube is drawn or rolled, the inner and outer tubes are tightly filled with glue. The thickness of the tortoise shell mesh structure is less than the thickness of the adhesive layer, and the tortoise shell mesh structure is spot-welded to the outer surface of the inner tube.

2. The concrete conveying pipe according to claim 1, characterized in that, Setting the outer surface of the inner tube and / or the inner surface of the outer tube as a rough surface specifically includes: A rough surface is formed on the outer surface of the inner tube by centrifugal casting. Alternatively, a rough surface can be formed on the outer surface of the inner tube and / or the inner surface of the outer tube by shot peening or machining.

3. The concrete conveying pipe according to claim 1, characterized in that, The process of assembling the inner tube inside the outer tube and providing an adhesive layer between the inner tube and the outer tube specifically includes: When the concrete conveying pipe is a straight pipe or a reducing pipe, an adhesive layer is pre-coated on the outer surface of the inner pipe before the outer pipe is fitted; or, the outer pipe is fitted on the outside of the inner pipe, and then an adhesive layer is filled between the inner pipe and the outer pipe.

4. The concrete conveying pipe according to claim 3, characterized in that, The pre-coating of the adhesive layer on the outer surface of the inner tube specifically includes: An adhesive layer is pre-coated on the outer surface of the inner tube, such that the thickness of the pre-coated adhesive layer is greater than the target thickness of the adhesive layer.

5. The concrete conveying pipe according to any one of claims 1 to 4, characterized in that, When the concrete delivery pipe is a straight pipe or a reducing pipe, the manufacturing method further includes: After the inner tube is compositely disposed inside the outer tube and an adhesive layer is provided between the inner tube and the outer tube, the outer tube is shaped by drawing or rolling process to form a molded outer tube with an inner diameter consistent with the target inner diameter.

6. The concrete conveying pipe according to any one of claims 1 to 4, characterized in that, The manufacturing method further includes: Cut a segment of the desired length from the formed double-layered laminated concrete conveying pipe; Flanges are connected to both ends of the conveying pipe section, and wear-resistant sleeves are installed at both ends of the conveying pipe section to form the finished conveying pipe.

7. A pumping device, characterized in that, Includes the concrete conveying pipe as described in any one of claims 1 to 6.

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