Material conveying elbow and material conveying pipeline
By disassembling the elbow into detachable units and installing wear-resistant inner lining plates, the problem of easy clogging and wear-through of elbows in pneumatic conveying systems is solved, achieving high applicability and wear resistance of the elbows, and facilitating installation and maintenance.
Patent Information
- Application Number
- CN202520723428.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-17
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-04-17
AI Technical Summary
In existing pneumatic conveying systems, the bends in the conveying pipes are prone to blockage and wear, and installation and maintenance are difficult, affecting system performance and production efficiency.
The elbow is disassembled into detachable elbow units, which are assembled using a modular method. The outer side is fitted with a more wear-resistant inner lining plate, and is fixed and sealed using threaded connectors and sealing rings. The main body of the elbow is made using a casting process to reduce weight and cost.
It improves the applicability and wear resistance of elbows, reduces the failure rate, facilitates installation and maintenance, and reduces downtime.
Smart Images
Figure CN223794869U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of material conveying pipeline, in particular to a material conveying elbow and a material conveying pipeline. BACKGROUND
[0002] As a more conventional bulk material conveying technology, pneumatic conveying technology is widely used in chemical industry, building materials, energy, food and animal husbandry industries. According to statistics, with the increase of the running time of the pneumatic conveying system, whether it is negative pressure pneumatic conveying or positive pressure pneumatic conveying, whether it is positive pressure dense phase pneumatic conveying or positive pressure dilute phase pneumatic conveying, the system failure rate is usually high at the turning part of the conveying pipeline, specifically at the elbow of the conveying pipeline. The main characteristics of the failure are that the bulk material is blocked at the elbow part and the outer arc surface of the elbow is worn out. For the pneumatic conveying system, in order to ensure its conveying performance and reduce the influence of the elbow on the system pressure drop, the bending radius of the elbow is usually 8-10 times the diameter of the pipeline, and the cold bending process or the blanking and welding of the round pipe are usually used to make it. A single elbow is large in volume and weight, and it is difficult to install and maintain by manpower alone. For the elbow in the high altitude, installation and maintenance are even more difficult. Therefore, how to effectively reduce the failure rate of the elbow part under the premise of ensuring the performance of the pneumatic conveying system, facilitate the installation and maintenance of the elbow, and reduce the influence on production has become a technical background factor for promoting the continuous development and improvement of the pneumatic conveying elbow. SUMMARY
[0003] The utility model of the present application aims to provide a material conveying elbow and a material conveying pipeline to improve the blockage of the material conveying elbow.
[0004] In the first aspect, a material conveying elbow is provided, which comprises: at least two detachably fixed elbow units; each elbow unit comprises an elbow body, and the outer arc surface of the elbow body is a hollow gap; further comprising an inner lining plate located in the hollow gap and surrounding the transmission material channel with the elbow body, and an elbow back plate detachably fixed with the elbow body and used for sealing the hollow gap;
[0005] Wherein, the wear resistance of the inner lining plate is greater than that of the elbow body, and the inner lining plate is fixedly connected with the elbow back plate.
[0006] In the above technical solution, the elbow is divided into at least two elbow units, and the elbow is assembled by assembling, so that the elbow can be assembled by different numbers of elbow units according to requirements, thereby improving the applicability of the elbow. In addition, the elbow is made into a split structure, which is convenient for maintenance of the elbow. Meanwhile, the inner lining layer with greater wear resistance is arranged on the outer arc surface of the elbow body in each elbow unit, thereby increasing the wear resistance of the elbow and reducing the failure rate of the elbow in use.
[0007] In a specific implementation, the two ends of the elbow body are annular structures; when the elbow back plate is fixedly connected with the elbow body, the elbow back plate overlaps with the annular structures.
[0008] In a specific implementation, the arc of the cross section of the inner lining plate is α, and 45°<α≤90°; and / or,
[0009] The arc length of the inner lining plate is L1, and the arc length of the elbow body is L2, and L2 / 2
[0010] In a specific implementation, the inner surface of the elbow body is coated with a wear-resistant coating.
[0011] In a specific implementation, the elbow body and the elbow back plate are fixedly connected through a threaded connecting piece.
[0012] In a specific implementation, the two sides of the length direction of the elbow body are respectively provided with first bosses;
[0013] The elbow back plate is provided with second bosses corresponding to the first bosses;
[0014] The threaded connecting piece is arranged through the first bosses and the second bosses and fixedly connects the first bosses and the second bosses.
[0015] In a specific implementation, the elbow body and the elbow back plate are sealingly connected through a sealing ring.
[0016] In a specific implementation, the inner arc surface of the elbow back plate is provided with a groove for accommodating the sealing ring.
[0017] In a specific implementation, the inner lining plate is a sintered ceramic plate.
[0018] In a specific implementation, the inner lining plate is a sintered ceramic plate.
[0019] In the above technical solution, the elbow is decomposed into at least two elbow units, and the elbow is assembled by assembling, so that the elbow can be assembled by different numbers of elbow units according to needs, improving the applicability of the elbow. In addition, the elbow is made into a split structure, which is also convenient for the maintenance of the elbow. At the same time, the inner lining layer with greater wear resistance is arranged on the outer arc surface of the elbow body in each elbow unit, thereby increasing the wear resistance of the elbow, and further reducing the failure rate of the elbow in use. BRIEF DESCRIPTION OF DRAWINGS
[0020] In the drawings, like reference numerals designate like or similar parts throughout the several views, and the drawings are not necessarily to scale. It should be understood that the drawings only depict some embodiments in accordance with the present disclosure and should not be considered limiting of the scope of the disclosure.
[0021] Figure 1 An application scenario diagram of the material conveying elbow provided by the embodiment of the present application is shown in the figure.
[0022] Figure 2 A structure diagram of the material conveying elbow provided by the embodiment of the present application is shown in the figure.
[0023] Figure 3 A disassembled view of the elbow unit provided by the embodiment of the present application is shown in the figure.
[0024] Figure 4 A sectional view of the elbow unit provided by the embodiment of the present application is shown in the figure.
[0025] Figure 5 A structure diagram of the elbow body provided by the embodiment of the present application is shown in the figure.
[0026] Figure 6 A structure diagram of the elbow back plate provided by the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION
[0027] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings.
[0028] It should be noted that the technical terms or scientific terms used in one or more embodiments of the present specification should be understood as the general meaning understood by those skilled in the art to which the present disclosure belongs, unless otherwise defined. The terms "first", "second", and the like used in one or more embodiments of the present specification do not represent any order, number, or importance, but are only used to distinguish different components. "Include" or "contain" and the like mean that the elements or objects before the word cover the elements or objects listed after the word and their equivalents, and do not exclude other elements or objects. "Connected" or "connected" and the like are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right", and the like are only used to represent relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0029] To facilitate the understanding of the material conveying elbow provided by the embodiments of the present application, first, the application scenario of the material conveying elbow provided by the embodiments of the present application is described. The material conveying elbow provided by the embodiments of the present application is applied in material conveying, and is used to convey material from one position to another position. During the material conveying process, due to site setting factors or other factors, it is inevitable to bend the conveying pipeline. In this state, the pipeline is often connected by an elbow. However, the existing elbow adopts an integral structure, the overall weight is large, and the angle of the elbow is fixed and cannot be adjusted. This leads to the situation that the elbow is not easy to install. Therefore, the embodiments of the present application provide a material conveying elbow to improve the adaptability of the elbow. The material conveying elbow provided by the embodiments of the present application is described in detail below in combination with specific drawings and embodiments.
[0030] First refer to Figure 1 , as shown in Figure 1 , a schematic diagram of the application scenario of the material conveying elbow 100 provided by the embodiments of the present application is shown. The material conveying elbow 100 provided by the embodiments of the present application is applied in a material conveying pipeline, which includes a plurality of straight pipelines 200 and the material conveying elbow 100. The straight pipeline 200 is connected and spliced with the material conveying elbow 100 to form a pipeline for conveying material. Among them, the material conveying pipeline changes the transmission direction of the material through the material conveying elbow 100 to match the requirements of the site or the requirements of the material conveying direction.
[0031] As Figure 2As shown, in the embodiment of the present application, the material conveying elbow 100 is composed of unit modules in a splicing manner, and the material conveying elbow 100 includes at least two elbow units 110 which are detachably and fixedly connected. It should be understood that the number of the elbow units 110 is not limited to two, and can be three, four, five or the like according to the needs, which can be determined according to the installation needs, and is not specifically limited in the embodiment of the present application. When the elbow unit 110 is specifically arranged, each elbow unit 110 can be regarded as a small elbow assembly, and the bending angle thereof is less than 90 degrees. For example, the bending angle a of the elbow unit 110 can be an integral angle of 90 degrees, such as 15 degrees, 30 degrees and 45 degrees or the like. It should be understood that the smaller the degree of the elbow unit 110, the higher the splicing degree of freedom, but the installation space of the fastener and the like should also be considered. As can be seen from the above description, the material conveying elbow 100 provided by the present application is composed of the material conveying elbow 100 by splicing the elbow units 110, so that a complete material conveying elbow 100 is split into a plurality of elbow units 110 with smaller weight. The material conveying elbow 100 can select different numbers of elbow units 110 according to the bending angle, thereby improving the degree of freedom of the material conveying elbow 100 in use. In addition, the overall material conveying elbow 100 is split into a plurality of elbow units 110, which can facilitate the assembly and maintenance of the material conveying elbow 100.
[0032] With reference to the foregoing Figure 2 As shown, the material conveying elbow 100 provided by the present application is spliced by at least two elbow units 110, and the adjacent elbow units 110 are detachably and fixedly connected to splice the plurality of elbow units 110 into an overall material conveying elbow 100. In one specific example, the adjacent elbow units 110 can be fixedly connected through the connecting flanges, thereby facilitating the splicing and combination between the elbow units 110.
[0033] In one example, when the material conveying elbow 100 is used for pneumatic transmission, the elbow units 110 are sealingly connected through the sealing pads, and the adjacent elbow units 110 are conductively connected through the static cross-over wires, so as to conductively connect the material conveying elbow 100 and the straight pipeline 200 in the entire conveying pipeline, thereby forming an overall conductor. The static electricity generated by the material in the conveying process due to friction can be transmitted to the ground through the conveying pipeline, thereby improving the safety of the conveying.
[0034] The structure and function of the elbow unit 110 will be described in detail below with reference to the specific drawings.
[0035] With reference to the foregoing Figure 3 and Figure 4 As shown, Figure 3 Fig. 8 shows an exploded view of the elbow unit 110 provided by the embodiment of the present application, Figure 4A sectional view of the elbow unit 110 is shown. The elbow unit 110 includes an elbow body 111, which is an arc structure. The bending angle of the elbow body 111 is the bending angle of the elbow unit 110. For convenience of description, the inner arc surface and the outer arc surface of the elbow body 111 are defined. The inner arc surface of the elbow unit 110 is the side of the elbow unit 110 facing the center of the circle, and the outer arc surface is the side away from the center of the circle.
[0036] In the material conveying process, the material conveying elbow 100 is used to change the conveying direction of the material, so the material contacts and rubs more with the inner wall of the conveying pipe in the elbow unit 110 close to the outer arc surface. To improve the wear resistance of the elbow unit 110, the outer arc surface of the elbow body 111 is provided with a hollow gap 1111, and an inner lining plate 113 is arranged in the hollow gap 1111. The inner lining plate 113 surrounds the channel conveying the material with the elbow body 111. The hollow gap 1111 is blocked by the elbow back plate 112, and the inner lining plate 113 is fixed on the elbow back plate 112. In a specific arrangement, the wear resistance of the inner lining plate 113 is greater than that of the elbow body 111, that is, the wear resistance of the inner lining plate 113 is greater than that of the elbow body 111. When the material rubs with the inner wall of the outer arc surface of the elbow unit 110 during material conveying, the material directly contacts the inner lining plate 113. Therefore, by replacing the area with greater friction with the material in the elbow unit 110 with the inner lining plate 113 with better wear resistance, the wear resistance of the elbow unit 110 is improved, and the effect of using the elbow unit 110 is improved.
[0037] In a specific arrangement of the elbow back plate 112, the elbow back plate 112 is detachably fixedly connected with the elbow body 111 and can seal the hollow gap 1111. When the material conveying elbow 100 is blocked, the material can be loosened by detaching the elbow back plate 112, thereby conveniently relieving the blockage during material conveying. In addition, the sealing connection between the elbow back plate 112 and the elbow body 111 can also ensure that the material does not leak during conveying, thereby ensuring the effect of material conveying.
[0038] As can be seen from the above description, the material conveying elbow 100 provided by the present application can be assembled into an elbow by assembling at least two elbow units 110, so that the elbow can be assembled by different numbers of elbow units 110 according to the needs, thereby improving the applicability of the elbow. In addition, the elbow is made into a split structure, which is convenient for the maintenance of the elbow. At the same time, the outer arc surface of the elbow body 111 in each elbow unit 110 is provided with an inner lining layer with greater wear resistance, thereby increasing the wear resistance of the elbow, and thereby reducing the failure rate of the elbow during use.
[0039] Reference is made to Figure 5 As shown in the drawings, when the hollow gap 1111 is arranged on the elbow body 111, the hollow gap 1111 is located between the two ends of the elbow body 111, that is, the two ends of the elbow body 111 are respectively annular structures 1113, and the hollow gap 1111 is located between the two annular structures 1113. When the elbow back plate 112 is fixedly connected with the elbow body 111, the elbow back plate 112 is overlapped with the annular structure 1113, thereby increasing the contact area between the elbow back plate 112 and the elbow body 111, so as to facilitate sealing. In addition, when the structure is adopted, it can also be ensured that the elbow body 111 has a certain structural strength.
[0040] When the above structure is adopted, it can be understood that the elbow unit 110 is made into a split structure, and the elbow unit 110 is split into two parts of the elbow body 111 and the elbow back plate 112. When processing, the elbow body 111 and the elbow back plate 112 can be processed respectively. Since the hollow gap 1111 is arranged on the elbow body 111, the elbow body 111 can be formed by casting, which is convenient for the preparation of the elbow body 111 and can also reduce the processing cost of the elbow body 111.
[0041] The lining plate 113 is the core component of the elbow unit 110, which bears the impact and abrasion of the material in the pipe. The shape of the lining plate 113 is adapted to the size of the hollow gap 1111, and the overall shape of the lining plate 113 is a spatial circular arc surface, which can be formed by die pressing and sintering. The structure can be made of ceramic material, which has high hardness and wear resistance, and can well resist the impact and abrasion from the material in the pipe, effectively improving the service life of the elbow.
[0042] In addition, when the hollow gap 1111 is arranged, the hollow gap 1111 should have a certain size to ensure that most of the material contacts the lining plate 113 in the hollow gap 1111 during material transmission. In a specific example, the hollow gap 1111 is arranged to satisfy that the cross section of the lining plate 113 is a circular arc plate, the radian of the cross section of the lining plate 113 is α, and 45°<α≤90°, that is, along the circumferential direction of the elbow body 111, the hollow gap 1111 can be opened to half of the circumference of the elbow body 111. In addition, in the length direction, the arc length of the lining plate 113 is L1, and the arc length of the elbow body 111 is L2, then L2 / 2
[0043] In an alternative, to further increase the wear resistance of the elbow unit 110, a wear-resistant coating is applied to the inner surface of the elbow body 111. Illustratively, the inner surface of the elbow body 111, which is in contact with the material, has a high roughness due to the casting process, and thus it is advantageous to spray a wear-resistant coating on the surface. The wear-resistant coating can be made of different materials such as PTFE or carbide (such as tungsten carbide). The wear-resistant coating sprayed on the casting-formed inner surface can have strong adhesion to the inner surface and is not easy to fall off, ensuring the stability of the wear-resistant coating and thus improving the wear resistance of the elbow unit 110.
[0044] When the elbow back plate 112 and the elbow body 111 are detachably fixedly connected, a threaded connection piece 115 can be used for fixed connection. Illustratively, the elbow body 111 and the elbow back plate 112 are fixedly connected through the threaded connection piece 115. The threaded connection piece 115 can be a bolt, a bolt assembly or other threaded connection piece 115. In a specific example, the elbow body 111 is provided with a first boss 1112 on each side in the length direction, and the corresponding elbow back plate 112 is provided with a second boss 1121 corresponding to the first boss 1112. Figure 5 As shown in FIG. 11, when the first boss 1112 is provided, the number of the first boss 1112 is two, and the two first bosses 1112 are arranged on the two sides of the axis of the elbow body 111. It should be understood that when the first boss 1112 is provided, the first boss 1112 extends to the outside of the annular structure 1113 of the elbow body 111. Similarly, as shown in FIG. 12, when the second boss 1121 is provided, the number of the second boss 1121 is two, and the two second bosses 1121 are arranged on the two sides of the axis of the elbow back plate 112. Figure 6
[0045] When the threaded connection piece 115 is used to connect the elbow back plate 112 and the elbow body 111, the threaded connection piece 115 is arranged through the first boss 1112 and the second boss 1121 and fixedly connects the first boss 1112 and the second boss 1121. Illustratively, a through hole is arranged on the first boss 1112, and a threaded hole is arranged on the second boss 1121. When the elbow back plate 112 and the elbow body 111 are matched, the first boss 1112 and the second boss 1121 are butted, and the through hole and the threaded hole are communicated, and the threaded connection piece 115 can be screwed with the threaded hole through the through hole. Of course, in addition to the above-mentioned example, other ways can also be used, which are not exemplified one by one in the embodiments of the present application.
[0046] In addition, the first boss 1112 mentioned above can also strengthen the structural strength of the elbow body 111 to compensate for the insufficient strength caused by the hollowed-out outer arc surface of the elbow body 111. Similarly, providing a second boss 1121 on the elbow back plate 112 can also increase the structural strength of the elbow back plate 112.
[0047] In an alternative embodiment, when setting up the electrostatic jumper, a threaded hole can be provided on the first boss 1112 to secure the bolt of the electrostatic jumper.
[0048] like Figure 6 As shown, when the elbow body 111 and the elbow back plate 112 are sealed, the elbow body 111 and the elbow back plate 112 can be sealed together by the sealing ring 114, thereby improving the sealing effect. In a specific example, the inner arc surface of the elbow back plate 112 is provided with a groove 1122, which is used to accommodate the sealing ring 114 to facilitate the assembly of the sealing ring 114. Exemplarily, when sealing, the sealing ring 114 can seal the contact surfaces of the first boss 1112 and the second boss 1121, and at the same time seal the contact surface between the annular structure 1113 and the elbow back plate 112, thereby improving the sealing effect.
[0049] In a specific example, the sealing ring 114 is attached to the elbow back plate 112 by an adhesive to prevent it from falling off during assembly and disassembly. Additionally, the sealing ring 114 has a spatial annular structure 1113, which can be manufactured as a single piece through vulcanization, or it can be made by filling a groove 1122 on the elbow back plate 112 with a single piece of sealing material to achieve a sealing effect. The sealing ring 114 can be made of temperature- and weather-resistant materials such as nitrile rubber or fluororubber.
[0050] In one specific implementation scheme, the inner liner 113 can be a sintered ceramic plate. Sintered ceramic plates have high strength and high wear resistance. When connecting the inner liner 113 to the elbow back plate 112, the inner liner 113 can be bonded and fixed to the elbow back plate 112 with adhesive. When setting the elbow back plate 112, the elbow back plate 112 can be manufactured by casting. The casting process results in a high surface roughness of the inner surface of the elbow back plate 112, which is beneficial for spraying adhesive on this surface, giving the inner liner 113 strong adhesion to this surface and making it less likely to fall off.
[0051] In one example, when the inner lining plate 113 is located in the hollowed-out notch 1111, the inner surface of the inner lining plate 113 smoothly transitions with the inner surface of the elbow body 111. That is, the surface of the inner lining plate 113 away from the elbow back plate 112 is flush or approximately flush with the inner surface of the elbow body 111, so that the sidewall of the formed channel is relatively smooth and the resistance during material conveying is reduced.
[0052] When the elbow units 110 are connected, the connection is fixed by the connecting flanges 1114. For example, each of the two ends of the elbow unit 110 is provided with a connecting flange 1114, one of the connecting flanges 1114 is provided with an annular boss 1115, and the other connecting flange 1114 is provided with an annular groove 1116. When two adjacent elbow units 110 are connected, the annular boss 1115 and the annular groove 1116 form a positioning fit to ensure the coaxiality of the elbow units 110 after connection. Of course, when the elbow unit 110 is connected to the straight pipeline 200, the annular boss 1115 or the annular groove 1116 can be arranged on the connecting flange 1114 of the corresponding straight pipeline 200 to match the structure of the elbow unit 110.
[0053] As can be seen from the above description, by adopting the right-angle integral angle design of the elbow unit 110, the free combination of multiple angles can be achieved, and the complex pipeline avoidance working conditions on site can be met. In addition, the elbow unit 110 adopts a small-angle segmentation design concept, which reduces the volume and weight of a single elbow unit 110, and provides great convenience for the packaging, shipping, installation and disassembly of the elbow unit 110.
[0054] Since the elbow unit 110 is formed in a splicing manner, the structural members (elbow body 111 and elbow back plate 112) of the elbow unit 110 can be prepared by casting process, and the characteristics of the casting process can be fully utilized to realize low-cost batch production of the elbow unit 110. In addition, the surface features of the casting process are also fully utilized to effectively enhance the adhesion of the wear-resistant material on the surface of the casting base (elbow body 111), and prevent the wear-resistant material from falling off during use.
[0055] By embedding and sintering ceramic material on the outer arc surface of the elbow body 111, the parts of the elbow unit 110 that are easily worn are reinforced, and the shutdown accidents caused by wear of the elbow are greatly reduced. When cooperating with the sintered ceramic plate, there is a hollow gap 1111 on the outer arc surface of the elbow body 111, and the hollow gap 1111 can be exposed by disassembling the elbow back plate 112, which greatly facilitates the problem of handling the blockage of the elbow. When arranging the sintered ceramic plate, the sintered ceramic plate is fixed on the elbow back plate 112, so that the sintered ceramic embedded on the outer arc surface of the elbow can be separated from the elbow body 111 in structure, which is convenient for replacing and maintaining the sintered ceramic. As can be seen from the above description, the hollow gap 1111 on the elbow body 111 in the embodiment of the application mainly provides space for the embedded installation of the lining plate 113, and also provides convenience for spraying a wear-resistant coating on the inner surface of the elbow body 111, and also provides an operation port for subsequent system blockage fault handling.
[0056] The material conveying elbow 100 provided by the embodiment of the application can not only be used in a pneumatic conveying system, but also be used in a liquid conveying system containing abrasive particles.
[0057] The embodiment of the present application further provides a material conveying pipeline, which comprises a plurality of straight pipelines 200 and at least one material conveying elbow 100.
[0058] In the above technical solution, the elbow is divided into at least two elbow units 110, and the elbow is assembled by assembling, so that the elbow units 110 of different numbers can be assembled into the required elbow according to the requirement, and the applicability of the elbow is improved. In addition, the elbow is made into a split structure, which is convenient for the maintenance of the elbow. Meanwhile, the inner lining layer with greater wear resistance is arranged on the outer arc surface of the elbow body 111 in each elbow unit 110, so that the wear resistance of the elbow is improved, and the failure rate of the elbow in use is reduced.
[0059] One or more embodiments of the present specification are intended to cover all such alternatives, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principle of one or more embodiments of the present specification should be included in the protection scope of the present disclosure.
[0060] The above is only a specific implementation manner of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims
1. A material conveying elbow, characterized in that include: At least two detachably fixed elbow units; Each elbow unit includes an elbow body with a hollowed-out notch on the outer arc surface; it also includes an inner liner plate located at the hollowed-out notch and forming a material conveying channel with the elbow body, and an elbow back plate that is detachably and fixedly connected to the elbow body and used to seal the hollowed-out notch. The wear resistance of the inner lining plate is greater than that of the elbow body, and the inner lining plate is fixedly connected to the elbow back plate.
2. The material conveying elbow of claim 1, wherein, The elbow body has two annular structures at both ends; when the elbow back plate is fixedly connected to the elbow body, the elbow back plate overlaps with the annular structures.
3. The material conveying elbow of claim 1, wherein, The curvature of the cross-section of the inner lining plate is α, and 45° < α ≤ 90°; and / or, If the arc length of the inner lining plate is L1 and the arc length of the elbow body is L2, then L2 / 2 < L1.
4. The material conveying elbow of claim 1, wherein, The inner surface of the elbow body is coated with a wear-resistant coating.
5. A material conveying elbow according to any one of claims 1 to 4, characterized in that The elbow body and the elbow back plate are fixedly connected by threaded connectors.
6. The material conveying elbow of claim 5, wherein, The elbow body has a first protrusion on each side along its length. The elbow back plate is provided with a second protrusion corresponding to the first protrusion. The threaded connector passes through the first boss and the second boss and fixes the first boss and the second boss together.
7. The material conveying elbow of claim 5, wherein, The elbow body and the elbow back plate are sealed together by a sealing ring.
8. The material conveying elbow of claim 7, wherein, The inner arc surface of the elbow back plate is provided with a groove to accommodate the sealing ring.
9. The material conveying elbow of claim 6, wherein, The inner lining plate is a sintered ceramic plate.
10. A material conveying pipe, characterized in that It includes multiple straight pipes and at least one material conveying elbow as described in any one of claims 1 to 9; the multiple straight pipes and at least one material conveying elbow are joined together to form a channel for conveying materials.