WO2012122808A1

WO2012122808A1 - Elbow for concrete conveying pipe

Info

Publication number: WO2012122808A1
Application number: PCT/CN2011/081758
Authority: WO
Inventors: 韩润录
Original assignee: 北汽福田汽车股份有限公司; 北京智科投资管理有限公司
Priority date: 2011-03-16
Filing date: 2011-11-03
Publication date: 2012-09-20
Also published as: CN102679078B; CN102679078A

Abstract

Disclosed in the present invention is an elbow (1) for the concrete conveying device, which comprises an elbow body (12) and an inner liner plate (13). A concave portion is provided in the outside inner wall of the elbow body (12), the inner liner plate is assembled into the concave portion and fits tightly with the surface of the concave portion, and the inner liner plate is detachably connected with the elbow body. The elbow for the concrete conveying pipe is provided with the exchangeable inner liner plate on the outside inner wall of the elbow body, which is worn seriously, thereby enabling the elbow for the concrete conveying pipe worn non-uniformly to wear uniformly, enhancing the service life of the elbow for the concrete conveying pipe farthest, and reducing the cost. Further, the inner liner plate of the elbow for the concrete conveying pipe is convenient to exchange.

Description

Concrete pipe elbow

Technical field

The invention relates to the field of concrete conveying equipment, and in particular to an elbow in a concrete conveying pipe.

Background technique

Concrete (also known as 砼) is an artificial stone made of a certain proportion of cementitious materials (such as cement), aggregate and water, which is formed by mixing and vibrating, and is cured under certain conditions; the density is generally

2400kg/m ³ . The aggregates are generally sand and stone, which act as skeletons in concrete. Aggregates are generally classified into coarse aggregates and fine aggregates depending on the material. The coarse aggregate is a stone, and the stone is divided into a pebbles and a gravel. The particle size is divided into 5 to 10 mm, 5 to 16 mm, 5 to 25 mm, 5 to 31. 5 mm, and 5 to 40 mm. The performance density of the stone is generally 2. 5~2. 7 ₈ /(^ ³ . When the air is dry, the bulk density is generally 140 (Tl500kg/m ³ . Fine aggregate means: sand; can be divided into river sand,匪密度密度密度海海海密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度密度Generally, it is 2. 6~2. 7 ₈ /011 ^{3. In the} dry state, the bulk density is generally about 1500kg/m ³ . The cement is a powdery hydraulic inorganic cementitious material, which is mixed with water to form a slurry, which can be in the air. Or hardened in water, and can firmly bond sand, stone and other materials together. The density of cement is generally 1300kg / m ³ . Concrete is poured on the construction site, a considerable part is driven by concrete pump truck, tow pump and vehicle pump The concrete is conveyed to the designated position through the concrete conveying pipeline. According to the characteristics of these power units, the concrete pressure in the conveying pipe is 8 MPa or more, and the flow speed is 3.5 m/sec or more, which is known from the composition of the above concrete: Aggregate The wear of the pipeline is very large, so the wear resistance of the pipeline is its main concern. According to the actual use, the service life of the pipeline is 15000 square. The elbow in the conveying direction has a shorter service life due to the unevenness of the wear.

In view of the aforementioned problem of wear unevenness, a prior art disclosed in FIGS. 1 and 2 is disclosed. The concrete pipe elbow Γ structure, the cross section of the concrete pipe elbow 采用 is designed with eccentric thickness, that is, the outer wall and the inner wall have different centers 01 and 02, and the centers 01 and 02 have a radial distance d, so that The outer sidewall thickness D1 which makes the wear more serious is larger than the inner sidewall thickness D2 to cope with the unevenness of the elbow wear. The concrete pipe elbow of this structure is made by first casting, and then machining the flanges of the two ends to form a joint of the flange 1 Γ.

The state of the concrete pipe elbow shown in Figure 1 after wear is shown in Figure 3 and Figure 4. It can be seen from the figure that the outer wall of the elbow is the fastest worn by the concrete pipe elbow; Judging, the outer sidewall wears about 5 to 6 times faster than the inner sidewall. When the elbow is worn and scrapped, the rest of the elbow wears little except for the local partial wear.

It can be seen that after the concrete concrete pipe elbow is thickened by the outer side wall, although the life of the concrete pipe elbow can be extended slightly, the outer side wall will still be damaged by the wear of other parts when the wear is small, the whole concrete The elbow of the conveying pipe can not be reused, that is, the service life of each part of the elbow of the whole concrete conveying pipe is very different, resulting in huge waste. Summary of the invention

(1) Technical problems to be solved

The technical problem to be solved by the present invention is how to improve the service life of the concrete pipe elbow.

(ii) Technical solutions

In order to solve the above technical problem, the concrete duct elbow of the present invention includes an elbow body, and further includes an inner patch, and an inner recessed wall is provided on an outer inner wall of the elbow body, and the inner patch is loaded into the The indentation zone is in conformity with the surface of the indentation zone, and the inner patch is detachably connected to the elbow body.

According to a further technical solution, the two ends of the indented area are provided with a stop.

The inset recess provides a better fit for the inner patch to fit into the recessed area, while also allowing a smooth transition between the indented area of the inner patch and the other areas of the elbow body.

A further technical solution is that a plurality of bolt holes are provided in the indentation zone, and bolt holes corresponding to the respective bolt holes of the indentation zone are provided on the inner patch plate, the inner patch plate and the elbow body They are connected by bolts and nuts that are mounted on the respective bolt holes. In the technical solution of the present invention, the bolt-and-nut connection is used to warn the replacement of the inner patch plate in comparison with other detachable connection methods commonly used in the art. When the bolt is damaged by the grinding, the bolt is squeezed out by the concrete row in the pipe, or a small leak occurs. Phenomenon, so you can prompt to replace the inner patch.

In a further technical solution, the indented area spans the center of the arc segment of the elbow body, and at least one bolt hole is disposed in the center of the arc segment.

For the concrete pipe elbow, the center position of the elbow body is the most serious. The bolts placed at this position are generally worn first, and the warning is the highest accuracy in replacing the inner plate.

In a further technical solution, the bolt hole on the inner patch plate is a countersunk hole, and the bolt is a countersunk bolt.

The use of countersunk bolts allows for the simultaneous wear of the bolts and the inner patch as much as possible, avoiding wear and tear on the inner patch after the bolts are worn out.

A further technical solution is that the straight length of the counterbore is l-3 mm

If the straight section of the counterbore is too short, the inner patch is easily separated from the elbow body; if the straight section of the counterbore is too long, the bolt and the inner patch are not synchronized. The inventors of the present application have found through repeated studies that it is most reasonable to select a straight length of l-3 mm.

A further technical solution is that the straight section length of the counterbore is 2

When the straight section length of the countersunk hole is 2mm, it not only can effectively fix the inner patch, but also ensure the wear of the countersunk head is just right. Its wear and scrap is just in sync with the wear of the inner patch, maximizing The waste of material savings.

A further technical solution is that the thickness of the outer wall is greater than the thickness of the inner wall in the central cross section of the elbow of the concrete pipe.

The eccentric thickness design of the outer wall and the inner wall can further ensure that the outer wall and the inner wall are as close as possible. Further technical solution is that the bolt hole is disposed at a central axis pointing to the elbow of the concrete conveying pipe.

This arrangement makes the elbow body and the inner patch plate more secure and has no gaps.

A further technical solution is that a spring pad is sequentially arranged between the nut and the elbow body. Sheet and gasket.

For concrete pipe elbows, the sealing must be guaranteed. The elastic gasket and sealing gasket between the nut and the elbow body can achieve better sealing effect.

(3) Beneficial effects

The concrete conveying pipe elbow of the invention is provided with a replaceable inner patching plate on the outer inner wall of the elbow body with relatively serious wear, which brings the following beneficial effects: 1 The concrete pipe elbow has good versatility and can realize mass production, The specifications of concrete pump trucks, tow pumps and vehicle pump pipeline elbows have become standard. The concrete duct elbows can also be interchanged with traditional elbows; and the number of concrete duct elbows is large. Take the 45-meter concrete pump truck as an example. More than a dozen such elbows are used in one vehicle. 2 Compared with the traditional elbow, the combination elbow reduces the cost and greatly reduces the waste of resources. 1 elbow body can be equipped with 4 inner patch plates for the same life wear, and 1 elbow body with 4 bends inside the patch plate, you can also use the above standard parts to block its bolt holes and continue to use it until it Wear leaks. This achieves an equal life design of the concrete pipe elbow. DRAWINGS

Figure 1 is a partial cross-sectional view of a prior art concrete pipe elbow;

Figure 2 is a cross-sectional view taken along line A-A of Figure 1;

Figure 3 is a cross-sectional view of the concrete pipe of Figure 1 after wear of the elbow;

Figure 4 is a cross-sectional view taken along line B-B of Figure 3;

Figure 5 is a cross-sectional view of the concrete pipe elbow of the present invention;

Figure 6 is a cross-sectional view taken along line C-C of Figure 5;

Figure 7 is an enlarged view of one of the joints of the inner patch and the elbow body in the elbow of the concrete duct.

The concrete duct elbow of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. detailed description

Referring to Figures 5-7, the concrete pipe elbow 1 of the present invention includes an elbow body 12 and an inner plate. 13. The elbow body 12 is the main supporting, pressure-bearing, and connecting portion of the concrete pipe elbow 1, and the wear of the portion is also the smallest portion, and the flange connecting port 11 on the elbow body 12 is used for connecting with other pipes. The inner patch plate 13 is located at the outer inner wall of the elbow 1 of the concrete conveying pipe, and this portion is also the portion with the largest amount of wear, which can be replaced as a wearing part.

The inner wall of the outer side of the elbow body 12 is provided with an indentation zone (not shown), and both ends of the indentation zone are provided with a stop for facilitating the engagement of the inner patch plate 13. The inner patch 13 is fitted into the indentation region and conforms to the surface of the indented region. a plurality of bolt holes (not shown) are arranged in the indentation zone, and bolt holes corresponding to the bolt holes of the indentation zone are provided on the inner patch plate 13 (the countersunk hole in the figure), and the inner patch plate 13 is The elbow bodies 12 are connected by a countersunk bolt 15 and a nut 17 which are mounted on the respective bolt holes. The bolt holes on the indentation zone and the inner patch plate 13 are disposed toward a central axis M of the concrete pipe elbow, and the central axis M refers to a central axis inside the elbow of the concrete pipe, which is an elbow with the concrete pipe The arc with the bending direction and the bending angle is the same, in other words, the bolt holes are arranged along the curved outer surface of the concrete pipe elbow, so that the inconsistencies of the plurality of bolts are avoided, and the inner patch 13 cannot be invaded. The area is tightly fitted and it is also possible to avoid poor sealing of some bolted joints. As shown in Fig. 7, the straight length L of the counterbore on the inner patch plate 13 is 2 匪, and 1-3 均可 can be selected in practice. As shown in Fig. 5, the indented region spans the center of the arc segment of the elbow body 12, and at least one bolt hole is provided in the center of the arc segment. In Fig. 5, the CC cutting position is the center position of the circular arc segment, which is generally the most wearable area of the concrete conveying pipe elbow. Therefore, the countersunk bolt 15 generally in this case is first worn and damaged, when the countersunk head When the bolt 15 is worn to the straight section, the countersunk bolt 15 may be squeezed out by the concrete in the pipe to cause leakage, which may prompt replacement of the inner patch plate 13. The specific manner of connecting the countersunk bolt 15 and the nut 17 to the elbow body 12 and the inner patch plate 13 is that a spring washer 16 and a sealing washer 14 are sequentially disposed between the nut 17 and the elbow body 12 to achieve a better seal. effect.

The inner patch 13 is formed by first casting, and the outer wall and the periphery thereof are fitted to the recessed portion of the elbow body 12, and the inner wall of the inner patch 13 and the inner wall of the elbow body 12 are combined into a smooth and integral inner surface. Similarly, the inner patch 13 also has the fastest center wear characteristics, which can be replaced as a consumable. The sealing gasket 14 is a combination sealing gasket, which is a standard part, the standard number is JB982, and its structure is a flat gasket inner circumference plus a rubber sheet. The sealing gasket 14 functions as a seal and a flat washer, thus preventing The moisture of the concrete is leaked. The spring washer 16 acts to prevent the nut 17 from loosening. The countersunk bolt 15 is preferably a hexagonal countersunk head bolt, which is a standard part, and its countersunk portion falls into the counterbore hole of the inner patch plate 13 and wears up with the inner patch plate 13. Since the wear of the center is the fastest, when the countersunk portion of the countersunk bolt 15 is ground to the root, the bolt rod of the part and the nut 17 connected thereto will fall off, and the concrete will leak, and the operator will It is known that the new inner plate 13 is replaced; at this time, since the countersunk portions of the remaining countersunk bolts 15 are slightly worn, the inner patch 13 is still fixed, and the inner patch 13 is not detached. The pipe is blocked, so the countersunk bolt 15 at the center of the arc segment also serves as a reminder to replace the new inner plate 13. The spring washer 16 is also a standard member that is attached to the countersunk bolt 15. The nut 17 is a standard member and is attached to the countersunk bolt 15. In addition, as shown in FIG. 6, the cross section of the concrete pipe elbow 1 of the present invention is designed with an eccentric thickness, that is, the outer wall and the inner wall have different centers 03 and 04, and the centers 03 and 04 have a radial distance, so that the wear is relatively thin. The thickness of the severe outer sidewall is greater than the thickness of the inner sidewall to further address the unevenness of the elbow wear.

It should be noted that the manner in which the bolt and nut are connected to the inner patch and the elbow body in the above embodiment is only an alternative. Obviously, the inner patch and the elbow body can also be used between the inner patch and the elbow body. Other detachable connections. In addition, the number of bolt holes in the main body of the elbow and the inner plate can also be selected according to actual needs.

The above embodiments are merely illustrative of the present invention and are not to be construed as limiting the scope of the invention, and various modifications and changes can be made without departing from the spirit and scope of the invention. Equivalent technical solutions are also within the scope of the invention, and the scope of the invention is defined by the claims.

Claims

Rights request

A concrete duct elbow, comprising an elbow body, further comprising an inner patch, wherein an inner wall of the elbow body is provided with an indentation region, and the inner patch is loaded into the inset The zone is fitted to the surface of the indentation zone, and the inner patch is detachably connected to the elbow body.

2. The concrete pipe elbow according to claim 1, wherein both ends of the indentation zone are provided with a stop.

3. The concrete pipe elbow according to claim 1, wherein a plurality of bolt holes are provided in the indentation zone, and each of the bolt holes in the indentation zone is provided on the inner patch plate. Corresponding bolt holes, the inner patch and the elbow body are connected by bolts and nuts mounted on the respective bolt holes.

4. The concrete pipe elbow according to claim 3, wherein the indentation zone spans the center of the arc segment of the elbow body, and at least one bolt hole is provided in the center of the arc segment.

The concrete pipe elbow according to claim 3, wherein the bolt hole on the inner patch is a counterbore, and the bolt is a countersunk bolt.

The concrete duct elbow according to claim 5, wherein the straight section of the counterbore has a length of l-3 mm

7. The concrete pipe elbow according to claim 6, wherein the straight section length of the counterbore is 2

8. The concrete pipe elbow according to claim 6, wherein the thickness of the outer wall is greater than the thickness of the inner wall in a central cross section of the concrete pipe elbow.

9. A concrete duct elbow according to any one of claims 3-8, wherein the bolt holes are arranged towards a central axis of the concrete duct elbow.

The concrete duct elbow according to claim 9, wherein a spring washer and a sealing gasket are sequentially disposed between the nut and the elbow body.