Concrete delivery elbow and concrete pump truck

Abstract

The application relates to a concrete conveying elbow pipe and a concrete pump truck, wherein the concrete conveying elbow pipe comprises a first elbow pipe, an outer side wall of an outer arc section of the first elbow pipe is provided with a fixed-point thickening part; the fixed-point thickening part is located on one side of a first central axis on a cross section of the first elbow pipe, a first groove is formed between the fixed-point thickening part and the first central axis; and / or the fixed-point thickening part is located on one side of a second central axis on the cross section of the first elbow pipe, a second groove is formed between the fixed-point thickening part and the second central axis. The concrete conveying elbow pipe and the concrete pump truck provided by the application are fixed-point thickened, the thickened area is the most easily-worn position of the conveying elbow pipe, the material of the area not easily worn is reduced, the easily-worn area is further thickened without increasing the material cost, and the service life is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of engineering machinery, in particular, relates to a concrete conveying elbow and a concrete pump truck. BACKGROUND

[0002] The concrete pump truck refers to a mechanical device with a concrete pumping unit and a distribution arm on a motor vehicle chassis. The conveying elbow used on the concrete pump truck is usually called a concrete conveying elbow, which is mainly used as an arc-shaped pipeline to change the flow direction of concrete.

[0003] The concrete pump truck pumps concrete to the required location along the conveying pipeline by pressure. During the pumping process, the concrete causes wear to the conveying elbow, resulting in failure of the conveying elbow. However, the wear is not uniform at all positions of the pipeline. The conveying elbow with thickened position in the prior art is usually thickened as a whole or thickened at the midpoint of the circular arc (i.e., the maximum curvature position) of the conveying elbow. However, the thickened region of the conveying elbow is not the most easily worn region, which has the defects of material waste and short service life.

[0004] Therefore, how to provide a conveying elbow with reasonable thickening has become a technical problem to be solved by those skilled in the art. SUMMARY

[0005] To solve the above technical problems, the purpose of the present application is to provide a concrete conveying elbow and a concrete pump truck. The conveying elbow is thickened at a fixed point, and the thickened region is the most easily worn position of the conveying elbow. The material of the region not easily worn is reduced. In the case of not increasing the material cost, the easily worn region is further thickened to improve the service life.

[0006] The technical scheme of the embodiment of the present application is as follows:

[0007] A concrete conveying elbow comprises a first elbow, an outer side wall of an outer arc segment of the first elbow is provided with a fixed-point thickening part; the fixed-point thickening part is located on one side of a first central axis on a cross section of the first elbow, and a first groove is formed between the fixed-point thickening part and the first central axis; and / or, the fixed-point thickening part is located on one side of a second central axis on the cross section of the first elbow, and a second groove is formed between the fixed-point thickening part and the second central axis.

[0008] Preferably, the fixed-point thickening part is located on any one side of the second central axis, or the fixed-point thickening part is provided on both sides of the second central axis.

[0009] Preferably, the fixed-point thickening part has a first boundary and a second boundary.

[0010] When the point thickening part is located on the lower side of the second center axis, the first boundary and the lower end of the first elbow pipe have a first transition zone, the second boundary and the second center axis have a second transition zone, and the second transition zone is formed by the second groove.

[0011] Preferably, the point thickening part has a first boundary and a second boundary; when the point thickening part is located on the upper side of the second center axis, the second boundary and the upper end of the first elbow pipe have a third transition zone, the first boundary and the second center axis have a fourth transition zone, and the fourth transition zone is formed by the second groove.

[0012] Preferably, when the second center axis is provided with the point thickening part on both sides, the point thickening part located on the lower side of the second center axis and the lower end of the first elbow pipe have a fifth transition zone; the two point thickening parts have a sixth transition zone therebetween, and the sixth transition zone is formed by the two second grooves; the point thickening part located on the upper side of the second center axis and the upper end of the first elbow pipe have a seventh transition zone.

[0013] Preferably, the first center axis is provided with the point thickening part on both sides, and the two point thickening parts have an eighth transition zone therebetween, and the two eighth transition zones form a first groove.

[0014] Preferably, a wear-resistant sleeve is included, and the wear-resistant sleeve is provided on both ends of the first elbow pipe and is integrally formed with the first elbow pipe.

[0015] Preferably, a second elbow pipe is included, the second elbow pipe is sleeved on the outside of the first elbow pipe and is coaxially arranged with the first elbow pipe, and the second elbow pipe is a two-half structure.

[0016] Preferably, a second elbow pipe is included, the second elbow pipe is sleeved on the outside of the first elbow pipe and is coaxially arranged with the first elbow pipe, and the second elbow pipe is a two-half structure.

[0017] A concrete pump truck includes the above-mentioned concrete conveying elbow pipe.

[0018] The embodiment of the present application provides a concrete conveying elbow pipe, which comprises a first elbow pipe, wherein an outer side wall of an outer arc section of the first elbow pipe is provided with a fixed-point thickening part, and the fixed-point thickening part is provided in multiple ways, one of which, a first groove is formed between the fixed-point thickening part and a first central axis, and the first groove is arranged so that the fixed-point thickening part avoids the first central axis on the cross section of the first elbow pipe; the second, a second groove is formed between the fixed-point thickening part and a second central axis, and the second groove is arranged so that the fixed-point thickening part avoids the second central axis on the axial section of the first elbow pipe; the third, the first groove and the second groove are arranged at the same time, and the fixed-point thickening part avoids the first central axis and the second central axis at the same time. No matter which structure is used, the core is to abandon the scheme of thickening at the central position on the cross section and / or axial section of the first elbow pipe in the traditional technology, or to move the manufacturing material of the first elbow pipe in the non-wearing area to the position more prone to wear, so that the fixed-point thickening part with the maximum thickness in the wearing area of the first elbow pipe can be obtained on the basis of not increasing the manufacturing material of the first elbow pipe, and the thickness of the fixed-point thickening part is as thick as possible in structure, so that the fixed-point thickening part is more wear-resistant and has a longer service life. Therefore, the concrete conveying elbow pipe and the concrete pump truck provided by the present application are provided with the fixed-point thickening part, the thickened area is the most wearing position of the conveying elbow pipe, the material in the non-wearing area is reduced, the wearing area is further thickened without increasing the material cost, and the service life is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, and are used together with the following specific embodiments to explain the present application, but do not constitute a limitation on the present application. In the drawings:

[0020] Figure 1 The axial section (that is, the XZ plane) schematic view of the concrete conveying elbow pipe provided by the embodiment of the present application is shown in the figure;

[0021] Figure 2 The longitudinal section schematic view of the concrete conveying elbow pipe provided by the embodiment of the present application is shown in the figure;

[0022] Figure 3 The axial section (that is, the XZ plane) schematic view of the concrete conveying elbow pipe provided by the embodiment of the present application is shown in the figure;

[0023] Figure 4 The axial section schematic view of the concrete conveying elbow pipe provided by the embodiment of the present application is shown in the figure;

[0024] Figure 5 The cross-sectional view of the concrete conveying elbow pipe provided by the embodiment of the present application along the first central axis direction (showing a° and b°) is shown in the figure;

[0025] Figure 6A cross-sectional view of the concrete conveying elbow pipe (showing c° and d°) provided by the embodiment of the present application;

[0026] Figure 7 A longitudinal cross-sectional view of the concrete conveying elbow pipe provided by the embodiment of the present application along the central direction of the first groove;

[0027] Figure 8 A cross-sectional view of the concrete conveying elbow pipe provided by the embodiment of the present application along the second central axis direction (i.e. OE direction);

[0028] Figure 9 A plurality of cross-sectional views of the concrete conveying elbow pipe provided by the embodiment of the present application;

[0029] Figure 10 A structural view of the fixed-point thickening part located at the lower side of the concrete conveying elbow pipe provided by the embodiment of the present application;

[0030] Figure 11 A structural view of the fixed-point thickening part located at the upper side of the concrete conveying elbow pipe provided by the embodiment of the present application.

[0031] Explanation of reference signs

[0032] 1, first elbow pipe; 11, fixed-point thickening part; 12, first groove; 13, second groove; 110, second central axis; 111, first transition zone; 112, second transition zone; 113, third transition zone; 114, fourth transition zone; 115, fifth transition zone; 116, sixth transition zone; 117, seventh transition zone; 118, eighth transition zone; 2, wear-resistant sleeve; 3, second elbow pipe; 4, filling layer; 5, flange. DETAILED DESCRIPTION

[0033] In order for those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present application.

[0034] In the description of the present application, it should be understood that the terms "upper", "lower", etc. indicate the orientation or positional relationship, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0035] There are some researches on thickening of concrete conveying elbow pipe in the prior art to improve the concrete conveying elbow pipe, mainly in the following directions, one is to set a wear-resistant layer at the center position of the longitudinal section of the conveying elbow pipe (for example, at the left and right areas of the center line with an angle of 45° with the horizontal line in a 90° elbow pipe), or to set a thickening part at the center position of the longitudinal section of the conveying elbow pipe, so that the thickness at this position is maximum; the other is to make the conveying elbow pipe as a whole thickening, so it can be seen that no matter what kind of thickening, the conveying elbow pipe in the traditional technology has the maximum thickness at the center position of the longitudinal section of the conveying elbow pipe.

[0036] The inventor analyzes a large number of worn-out concrete conveying elbow pipes, and finds that all the worn-out conveying elbow pipes have wear-through holes of different sizes. Once the wear-through hole appears, the concrete in the conveying elbow pipe will flow out from the wear-through hole. Through the analysis of the position, size and shape of the wear-through hole, such as the arc length of the wear-through hole (mainly the boundary of the wear-through hole on the outer arc segment) from the end of the conveying elbow pipe, the arc length of the wear-through hole (mainly the boundary of the wear-through hole on the inner arc segment) from the end of the conveying elbow pipe, and the circumference of the boundary of the wear-through hole on the outer arc segment, etc., the inventor obtains an important discovery that the most easily worn position of the conveying elbow pipe is neither in the center area of the cross section of the conveying elbow pipe nor in the center area of the longitudinal section of the conveying elbow pipe. The thickening scheme in the prior art lacks the research on the worn-out conveying elbow pipe, and the conveying elbow pipe provided by the prior art has the maximum thickness in the center area of the cross section of the conveying elbow pipe and / or the center area of the longitudinal section of the conveying elbow pipe. Therefore, the conveying elbow pipe provided by the prior art has the defects of waste of manufacturing materials of the conveying elbow pipe, short service life, etc.

[0037] The core of the present application is to change the setting method of the thickening area of the conveying elbow pipe based on the research on a large number of worn-out conveying elbow pipes, to set a fixed-point thickening part 11 in the non-center area of the cross section of the conveying elbow pipe and / or the non-center area of the longitudinal section of the conveying elbow pipe, which obtains the maximum thickness, while reducing the thickness of the center area of the cross section of the conveying elbow pipe and / or the center area of the longitudinal section of the conveying elbow pipe, to increase the thickness of the easily-worn area and reduce the thickness of the not-easily-worn area, thereby further thickening the easily-worn area without increasing the manufacturing materials of the conveying elbow pipe, without increasing the weight of the conveying elbow pipe, achieving lightweight, and obtaining a longer service life and lower manufacturing cost.

[0038] Please like Figures 1 to 11As shown, the concrete conveying elbow pipe provided by the present application comprises a first elbow pipe 1, and a fixed-point thickening part 11 is arranged on the outer side wall of the outer arc segment of the first elbow pipe 1; the fixed-point thickening part 11 is located on one side of a first central axis on the cross section of the first elbow pipe 1, and a first groove 12 is formed between the fixed-point thickening part 11 and the first central axis; and / or the fixed-point thickening part 11 is located on one side of a second central axis 110 on the axial cross section of the first elbow pipe 1, and a second groove 13 is formed between the fixed-point thickening part 11 and the second central axis 110.

[0039] The concrete conveying elbow pipe provided by the present application comprises a first elbow pipe 1, wherein a fixed-point thickening part 11 is arranged on the outer side wall of the outer arc segment of the first elbow pipe 1, and the fixed-point thickening part 11 has multiple setting modes, one of which is that a first groove 12 is formed between the fixed-point thickening part 11 and a first central axis, and the setting of the first groove 12 enables the fixed-point thickening part 11 to avoid the first central axis on the cross section of the first elbow pipe 1; another of which is that a second groove 13 is formed between the fixed-point thickening part 11 and a second central axis 110, and the setting of the second groove 13 enables the fixed-point thickening part 11 to avoid the second central axis 110 on the axial cross section of the first elbow pipe 1; and the third of which is that the first groove 12 and the second groove 13 are simultaneously set, and the fixed-point thickening part 11 simultaneously avoids the first central axis and the second central axis 110. Regardless of the specific structure, the core is to abandon the scheme of thickening at the central position on the cross section and / or axial cross section of the first elbow pipe 1 in the traditional technology, or the overall thickening scheme, and to move the manufacturing material of the first elbow pipe 1 in the non-wearing area to the position more prone to wear, so that the fixed-point thickening part 11 with the maximum thickness in the wearing area of the first elbow pipe 1 can be obtained on the basis of not increasing the manufacturing material of the first elbow pipe 1, and in terms of structure, the thickness of the fixed-point thickening part 11 is as thick as possible, and thus the fixed-point thickening part 11 is more wear-resistant and has a longer service life. Therefore, the concrete conveying elbow pipe and the concrete pump truck provided by the present application are fixed-point thickening for the conveying elbow pipe, the thickened area is the most prone to wear position of the conveying elbow pipe, the material in the non-wearing area is reduced, the wearing area is further thickened without increasing the material cost, and the service life is improved.

[0040] It should be noted that the cross section and the axial cross section of the first elbow pipe 1 should be regarded as names provided for the convenience of describing the core mechanism of the concrete conveying elbow pipe, and cannot be regarded as a limitation on the structure of the concrete conveying elbow pipe. The present application mainly takes the 90° elbow pipe as an example, but cannot be regarded as a limitation on the concrete conveying elbow pipe. The present application can also be applied to elbow pipes of other angles, and as long as the technical mechanism of the present application is not deviated, it should be regarded as falling within the protection scope of the present application.

[0041] Without loss of generality, the outer contour of the fixed-point thickening portion 11 in the present application is a smooth curve, which can reduce the local stress of the fixed-point thickening portion 11. For example, if the fixed-point thickening portion 11 is provided with a sharp structure, the local stress of the fixed-point thickening portion 11 will be too large during the casting process, which may affect the service life of the concrete conveying elbow pipe. On the other hand, the outer contour of the fixed-point thickening portion 11 is provided as a smooth curve, which reduces the difficulty of demolding during the casting process of the concrete conveying pipe and reduces the manufacturing cost of the concrete conveying pipe.

[0042] There are many embodiments for the fixed-point thickening portion 11, which will be described as follows. The fixed-point thickening portion 11 is located on one side of the second central axis 110, or the fixed-point thickening portion 11 is provided on both sides of the second central axis 110. The fixed-point thickening portion 11 can be close to the inlet end of the first elbow pipe 1, or closer to the outlet end of the first elbow pipe 1, or the fixed-point thickening portion 11 is provided near the inlet end and the outlet end of the first elbow pipe 1. In fact, the inventor found through statistical analysis of the worn-out conveying elbow pipe that the area close to the inlet end of the first elbow pipe 1 is more prone to wear. Therefore, the fixed-point thickening portion 11 is provided closer to the inlet end of the first elbow pipe 1, or the fixed-point thickening portion 11 is provided near the inlet end and the outlet end of the first elbow pipe 1, which can obtain a better service life.

[0043] In the embodiments provided by the present application, as shown in Figure 10 The fixed-point thickening portion 11 has a first boundary and a second boundary. When the fixed-point thickening portion 11 is located on the lower side of the second central axis 110, the first boundary and the lower end of the first elbow pipe 1 have a first transition zone 111, and the second boundary and the second central axis 110 have a second transition zone 112, and the second transition zone 112 is formed by the second groove 13. The first boundary and the second boundary are the maximum boundaries on the outer contour of the fixed-point thickening portion 11. When the fixed-point thickening portion 11 is provided only on the lower side of the second central axis 110 of the first elbow pipe 1, the first transition zone 111 and the second transition zone 112 are provided at the same time. It should be understood that the thicknesses of the first transition zone 111 and the second transition zone 112 are both less than the thickness of any position of the fixed-point thickening portion 11.

[0044] In the embodiments provided by the present application, as shown in Figure 11As shown, the point thickening has a first boundary and a second boundary; when the point thickening 11 is located on the upper side of the second central axis 110, the second boundary has a third transition zone 113 between the upper end of the first elbow pipe 1, and the first boundary has a fourth transition zone 114 between the second central axis 110, and the fourth transition zone 114 is formed by the second groove 13. Among them, the first boundary and the second boundary are the maximum boundaries on the outer contour of the point thickening 11, when the point thickening 11 is arranged only on the upper side of the second central axis 110 of the first elbow pipe 1, while the third transition zone 113 and the fourth transition zone 114 are arranged, it should be understood that the thickness corresponding to the third transition zone 113 and the fourth transition zone 114 is less than the thickness of any position of the point thickening 11.

[0045] Preferably, when the point thickening 11 is arranged on both sides of the second central axis 110, the point thickening 11 located on the lower side of the second central axis 110 has a fifth transition zone 115 between the lower end of the first elbow pipe 1; the sixth transition zone 116 is formed between the two point thickening zones, and the sixth transition zone 116 is formed by two second grooves 13; the point thickening 11 located on the upper side of the second central axis 110 has a seventh transition zone 117 between the upper end of the first elbow pipe 1. When the point thickening 11 is arranged on both sides of the second central axis 110, the sixth transition zone 116 (i.e. the second groove 13) is formed between the two point thickening 11, in addition, the fifth transition zone 115 and the seventh transition zone 117 are arranged near the two ends of the first elbow pipe 1 respectively, and at the same time, the first groove 12 is arranged between the point thickening 11 of the first elbow pipe 1 and the first central axis, so as to improve the service life of the concrete conveying elbow pipe.

[0046] Among them, please Figures 1 to 9 As shown, the first central axis is provided with the point thickening 11 on both sides, and the eighth transition zone 118 is formed between the two point thickening 11, and the first groove 12 is formed by the two eighth transition zones 118. In this embodiment, the determination of the outer contour of the point thickening 11 is based on the fifth transition zone 115, the sixth transition zone 116 (i.e. the second groove 13), the seventh transition zone 117 and the first groove 12 as constraint conditions to limit the outer contour of the point thickening 11. It can be understood that the thickness corresponding to any position of the above is less than the thickness of the point thickening 11, and the non-wear-resistant area material is as little as possible and the wear-resistant area material is as much as possible, so as to thicken the wear-resistant area as much as possible and improve the service life of the concrete conveying elbow pipe.

[0047] Please refer to Figure 5 , Figure 6 As shown, and Figures 1 to 4As shown, in order to more clearly understand the inventive concept and core of the present application, the origin of the concrete conveying elbow pipe is O point, the axial section of the concrete conveying elbow pipe is selected as the XZ plane, the cross section of the concrete conveying elbow pipe is selected as the XY plane, OE is the second central axis 110, the lower end surface of the first elbow pipe 1 is parallel to the X axis, the central angle corresponding to ∠XOA is a°, in the XZ plane, the circular arc segment corresponding to a° is the fifth transition zone 115, the central angle corresponding to ∠XOB is b°, the circular arc segment corresponding to ∠AOB is the fixed-point thickening part 11; Similarly, the central angle corresponding to ∠ZOD is a°, in the XZ plane, the circular arc segment corresponding to ∠ZOD is the seventh transition zone 117, the central angle corresponding to ∠ZOC is b°, the circular arc segment corresponding to ∠COD is the fixed-point thickening part 11 close to the upper side of the first elbow pipe 1; At this time, the circular arc segment corresponding to ∠COB is the second groove 13, that is, the concave region formed between the two fixed-point thickening parts 11 forms the second groove 13, preferably, a° is 15°, b° is 37°, in the XY plane, the eighth transition zone 118 is arranged between the two fixed-point thickening parts 11, and c° and d° exist at the position where the fixed-point thickening part 11 is thicker, preferably, c° can be 35°, and d° can be 70°. The settings of a°, b°, c° and d° can be adaptively adjusted according to actual conditions without departing from the technical mechanism of the present application.

[0048] In the embodiments provided by the present application, the first elbow pipe 1 is provided with a wear-resistant sleeve 2 at both ends, the wear-resistant sleeve 2 is integrally formed with the first elbow pipe 1, the concrete conveying elbow pipe mainly adopts the wear-resistant sleeve 2 to connect with other components to realize the pumping of concrete, and needs to be continuously installed or disassembled, so the structural strength and reliability are very important. The present application adopts the integrally formed structure of the wear-resistant sleeve 2 and the first elbow pipe 1, improves the connection reliability and service life of the concrete conveying elbow pipe.

[0049] The concrete conveying elbow pipe comprises a second elbow pipe 3, the second elbow pipe 3 is arranged outside the first elbow pipe 1 in a coaxial manner, and the second elbow pipe 3 is a two-half structure. The two-half structure mainly refers to that the second elbow pipe 3 is formed by splicing and welding two semicircular structures, which can be adaptively improved according to the positions and numbers of the fixed-point thickening parts 11 on the first elbow pipe 1, and the outer arc segment of the second elbow pipe 3 is forged and formed according to the fixed-point thickening parts 11 on the first elbow pipe 1, so that the first elbow pipe 1 and the second elbow pipe 3 are tightly fitted, no filling is needed between the first elbow pipe 1 and the second elbow pipe 3, the structure of the concrete conveying elbow pipe can be simplified, and the weight of the concrete conveying elbow pipe can be reduced.

[0050] In the embodiments provided by the present application, the concrete conveying elbow pipe comprises a second elbow pipe 3, which is sleeved outside the first elbow pipe 1 and coaxially arranged with the first elbow pipe 1, and is of an integral structure; a filling layer 4 is arranged between the second elbow pipe 3 and the first elbow pipe 1; the outer side of the wear-resistant sleeve 2 is provided with a flange 5, which is connected with the second elbow pipe 3. The filling layer 4 can be light in mass and dense in filling, so as to reduce the vibration in the conveying process. The above structure can make the concrete conveying elbow pipe have a longer service life.

[0051] The present application provides a concrete pump truck comprising the above concrete conveying elbow pipe, and the specific technical effects can be referred to the technical effects of the above concrete conveying elbow pipe, which will not be repeated here.

[0052] The above is only the preferred embodiment of the present application, and it should be pointed out that, for those skilled in the art, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

[0053] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts of each embodiment can be referred to each other.

[0054] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A concrete delivery elbow characterized by, It includes a first bend (1), and a fixed-point thickening part (11) is provided on the outer side wall of the outer arc segment of the first bend (1), and the outer contour of the fixed-point thickening part (11) is a smooth curved surface; The fixed-point thickening portion (11) is located on one side of the first central axis on the cross-section of the first bend (1), and a first groove (12) is formed between the fixed-point thickening portion (11) and the first central axis; and, The fixed-point thickening part (11) is located on one side of the second central axis (110) on the axial section of the first bend (1), and a second groove (13) is formed between the fixed-point thickening part (11) and the second central axis.

2. The concrete delivery elbow of claim 1, wherein, The fixed-point thickening part (11) is located on either side of the second central axis (110), or the fixed-point thickening part (11) is provided on both sides of the second central axis (110).

3. The concrete delivery elbow of claim 2, wherein, The fixed-point thickened part (11) has a first boundary and a second boundary; When the fixed-point thickened portion (11) is located below the second central axis (110), there is a first transition zone (111) between the first boundary and the lower end of the first bend (1), and there is a second transition zone (112) between the second boundary and the second central axis (110), and the second transition zone (112) is formed by the second groove (13).

4. The concrete delivery elbow of claim 2, wherein, The fixed-point thickened part (11) has a first boundary and a second boundary; When the fixed-point thickened part (11) is located on the upper side of the second central axis (110), there is a third transition zone (113) between the second boundary and the upper end of the first bend (1), and there is a fourth transition zone (114) between the first boundary and the second central axis (110), and the fourth transition zone (114) is formed by the second groove (13).

5. The concrete delivery elbow of claim 2, wherein, When the fixed-point thickening part (11) is provided on both sides of the second central axis (110), there is a fifth transition zone (115) between the fixed-point thickening part (11) located on the lower side of the second central axis (110) and the lower end of the first bend (1); A sixth transition zone (116) is provided between the two fixed-point thickened portions, the sixth transition zone (116) being formed by the two second grooves (13); A seventh transition zone (117) is formed between the fixed-point thickened portion (11) located on the upper side of the second central axis (110) and the upper end of the first bend (1).

6. A concrete delivery elbow according to any one of claims 1 to 5, characterised in that, The fixed-point thickening part (11) is provided on both sides of the first central axis, and an eighth transition area (118) is provided between the two fixed-point thickening parts (11), and the two eighth transition areas (118) form a first groove (12).

7. The concrete delivery elbow of claim 6, wherein, Includes wear-resistant sleeves (2), both ends of the first bend (1) are provided with the wear-resistant sleeves (2), and the wear-resistant sleeves (2) and the first bend (1) are integrally formed.

8. The concrete delivery elbow of claim 7, wherein, It includes a second bend (3), which is sleeved on the outside of the first bend (1) and coaxially arranged with the first bend (1). The second bend (3) has a two-half structure.

9. The concrete delivery elbow of claim 7, wherein, Including the second bend (3), The second elbow pipe (3) is sleeved outside the first elbow pipe (1) and coaxially arranged with the first elbow pipe (1), and the second elbow pipe (3) is of an integral structure. A filling layer (4) is arranged between the second elbow pipe (3) and the first elbow pipe (1). A flange (5) is arranged outside the wear sleeve (2), and the flange (5) is connected with the second elbow pipe (3).

10. A concrete pump truck, characterized by The concrete conveying elbow pipe according to any one of claims 1-9.

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