WO2011015082A1

WO2011015082A1 - Conveying bent pipe, concrete conveyer and manufacturing method of the conveying bent pipe

Info

Publication number: WO2011015082A1
Application number: PCT/CN2010/073798
Authority: WO
Inventors: 易小刚; 秦建军; 欧耀辉; 王海兵
Original assignee: 湖南三一智能控制设备有限公司; 三一重工股份有限公司
Priority date: 2009-08-04
Filing date: 2010-06-11
Publication date: 2011-02-10
Also published as: CN101625060A

Abstract

A conveying bent pipe, a concrete conveyer and a manufacturing method of the conveying bent pipe are disclosed. The disclosed conveying bent pipe comprises an inner pipe, an outer pipe and a filling layer, wherein the outer pipe comprises at least two supporting pipes which are sequentially connected with each other. The outer pipe of the conveying bent pipe provided by the invention has a split type structure and comprises two or more supporting pipes, thereby reducing the cost of the conveying bent pipe while ensuring wearing resistance, strength, high toughness and shock resistance of the same. In a preferred technical solution, the inner pipe and outer pipe are fixed by an adhesive layer so that not only the acting force of the inner pipe can be transferred to the outer pipe and the supporting and protecting function of the outer pipe for the inner pipe can be ensured, and but also safety of the conveying bent pipe can be increased. With the manufacturing method of the conveying bent pipe, not only the manufacturing process can be simplified in manufacturing the conveying bent pipe, but also the number of auxiliary devices can be reduced, and the manufacturing cost of the conveying bent pipe can be lowered.

Description

The invention claims to be submitted to the Chinese Patent Office on August 4, 2009, the application number is 200910159056.0, and the invention name is "a conveying elbow, a concrete conveying machine and The priority of the Chinese Patent Application for the Production of the Conveyor Bend is incorporated herein by reference. Technical field

The invention relates to a wear-resistant pressure-resistant conveying pipe technology, in particular to a conveying elbow, a concrete conveying machine having the conveying elbow, and a manufacturing method of the conveying elbow. Background technique

At present, in carrying out construction work, concrete is generally conveyed to a predetermined place by a suitable construction machine to carry out a predetermined operation. In the process of conveying concrete, the concrete slurry passes through the conveying pipe to the predetermined place under the appropriate pressure to carry out the concrete pouring or pouring operation at a position away from the mixing station.

In the process of conveying concrete, on the one hand, the inner wall of the conveying pipe is subjected to the continuous erosion and wear caused by the flow of the concrete slurry; on the other hand, the conveying pipe is subjected to the pressure of the concrete mud, at a higher or farther distance When conveying concrete, the pipe is subjected to higher pressure. The erosion and wear of the concrete slurry on the inner wall of the conveying pipe requires high hardness of the inner wall of the conveying pipe; the pressure action requires that the conveying pipe as a whole has high toughness and impact resistance.

In order to meet the above requirements, currently, a combination of an inner tube and an outer tube is generally used to form a delivery tube. The inner tube can obtain higher hardness by means of hot working to improve the wear resistance of the inner wall of the conveying pipe; however, while obtaining higher hardness, the toughness of the inner tube is lowered. In order to prevent the inner tube from being brittle under high pressure, it is also suitable for the outer tube of the inner tube; the outer tube is made of high-strength, high-toughness metal material, wrapped around the inner tube to withstand the pressure of the concrete slurry, and withstand Pressure shock, prevent the inner tube from brittle, and improve the overall strength and impact resistance of the conveying tube. The combination of the inner tube and the outer tube ensures that the tube has a high overall strength and a strong wear resistance to meet the above requirements.

Please refer to FIG. 1 , which is a knot of a curved pipe disclosed in Chinese Patent Document CN 101107187. Schematic diagram. The disclosed elbow includes an inner tube 110 and an outer tube 120. A closed annular space is formed between the inner tube 110 and the outer tube 120. The annular space is filled with concrete to form a packing layer 130. The inner tube 110 is made of wear-resistant material. It has a high hardness to ensure the inner wall of the elbow has strong wear resistance; the outer tube 120 has high toughness and strength, which is used to enhance the overall strength and toughness of the elbow and improve the impact resistance of the elbow. . The combination of inner tube 110 and outer tube 120 meets the need to transport concrete. Meanwhile, this patent document also discloses a method of making a bent pipe. The disclosed method is: combining the inner tube 110 and the outer tube 120 to form a tube body; then, the centering auxiliary mechanism is respectively introduced into the tube body at the end side to fix the inner tube 110 and the outer tube 120, and the inner tube 110 and the inner tube 110 and The outer tube 120 is kept concentric, and then a filling layer 130 is formed by filling the annular space enclosed between the inner tube 110 and the outer tube 120 through the filling port 111 located in the inner tube 110 by a filling device.

Although the above-mentioned elbow can meet the requirements of conveying concrete, it also has the following defects:

1. In order to prepare for the installation and transportation of concrete, the longitudinal sections of the inner tube 110 and the outer tube 120 of the above-mentioned elbow are all standard circular arc structures; in order to form a proper annular space between the inner tube 110 and the outer tube 120, In order to form the filling layer 130, the outer surface of the inner tube 110 and the inner surface of the outer tube 120 are required to have high dimensional accuracy; this requirement increases the difficulty of making the curved tube on the one hand, and increases the manufacturing cost of the curved tube on the other hand. .

2. Also for the purpose of making the installation, and also for the smooth flow of the concrete slurry, the longitudinal sections of the inner and outer surfaces of the inner tube 110 are both circular arcs, and it is necessary to keep the wall thicknesses of the inner tubes equal. However, during use, the wear amount of each part of the inner tube 110 is not the same. Therefore, when the outer arc portion of the inner tube 110 is worn for a period of time, a thick wear-resistant material remains in the inner arc portion. The wear-resistant material for making the inner tube cannot be fully utilized, resulting in waste of the wear-resistant material; and because the cost of the wear-resistant material for making the inner tube is high, this further leads to the use cost of the bent tube.

3. The filling layer 130 between the inner tube 110 and the outer tube 120 can only support the inner tube 110, and the filling layer 130 itself has no wear resistance or wear resistance very low; in use, due to the inner tube When the outer arc portion of the inner tube 110 is worn out by the uneven wear of the inner tube 110, the inner arc portion will be separated from the filling layer 130 under the impact of the concrete mud, thereby falling into the curved tube, causing the blockage of the bent pipe and affecting the concrete. Conveying; When conveying concrete at high pressure, the blockage of the elbow can cause serious accidents. Therefore, the above-mentioned elbow still has serious safety hazards. 4. Filling the annular space between the inner tube 110 and the outer tube 120 to form a filling layer 130. The filling layer 130 has a large weight, thereby increasing the weight of the concrete conveying pipeline, easily increasing the difficulty of the arrangement of the conveying tube, and increasing the difficulty. The load of the concrete boom or boom.

In addition, the manufacturing process of the above-mentioned elbow requires a centering assisting mechanism having an expanding function to position the outer tube 120 and the inner tube 110, and a specific injecting mechanism is required to inject the concrete into the outer tube 120 and the inner tube 110 through the filling port 111 of the inner tube 110. In the annular space between them, the filling layer 130 is formed, and therefore, there is a defect that the mounting process is complicated and the manufacturing cost is high. Summary of the invention

In view of the above drawbacks, in terms of objects, a first object of the present invention is to provide a transport elbow to reduce the dimensional accuracy requirements of the transport elbow, and to facilitate the transport of the elbow and reduce the manufacturing cost of the transport elbow.

A second object is to provide a conveying elbow that makes full use of the wear-resistant material, and at the same time, prolongs the service life of the conveying elbow.

A third object is to provide a conveying elbow capable of preventing the inner tube member from falling off, so as to keep the conveying elbow pipe smooth and improve the safety performance of the conveying elbow.

The object of the present invention in the process flow is to provide a method for manufacturing a conveying elbow, which simplifies the manufacturing process of the conveying elbow and reduces the manufacturing cost of the conveying elbow.

In order to achieve the above first object, the present invention provides a conveying elbow comprising an inner tube, an outer tube and a filling layer between the inner tube and the outer tube, characterized in that The tube includes at least two support tubes that are sequentially connected.

Preferably, adjacent support tubes are fixed together by welding.

Preferably, the outer tube end portion further has a radially protruding inner protrusion.

Preferably, the outer tube has a glue injection hole, and the glue injection hole penetrates the outer tube wall; the filling layer is an adhesive layer formed of an adhesive.

Preferably, the inner surface of the outer tube has a flow guiding groove.

Optionally, the outer surface of the inner tube has a flow guiding groove.

Preferably, the flow guiding groove extends in a spiral shape.

Preferably, the bonding layer has a maximum thickness of less than 3 mm. Preferably, the glue injection hole is located in a micro deformation zone on the side of the outer tube.

In order to achieve the above second object at the same time, in the conveying elbow provided by the present invention, the wall thickness of the inner arc portion of the inner tube is smaller than the wall thickness of the outer arc portion of the inner tube, or from the inner side of the inner tube inner line to the The outer side of the center line, the thickness of the inner tube wall gradually increases.

Preferably, the thickness of both end portions of the outer arc portion of the inner tube is smaller than the thickness of the intermediate portion of the outer arc portion; or, the thickness of the outer arc portion of the inner tube gradually increases from the both end portions to the intermediate portion.

In order to achieve the third object of the present invention, the present invention provides a concrete conveying machine comprising a conveying pipe, the conveying pipe comprising a conveying straight pipe and a conveying elbow, wherein the conveying elbow is any one of the above Conveying the elbow.

In order to achieve the object of the process flow of the present invention, the present invention provides a method of manufacturing a transport elbow, the method comprising the following steps:

The support tube is sleeved outside the inner tube;

Welding the support tube to form an outer tube;

The outer tube and the inner tube are positioned to each other, and an annular space is formed between the outer tube and the inner tube; an adhesive is injected into the annular space through the injection hole to form an adhesive layer.

Compared with the prior art, the outer tube for conveying the elbow provided by the present invention has a split structure, and includes two or more support tubes. In one aspect, the technical solution can reduce the accuracy requirement for the assembly size of the support tube while maintaining the assembly performance of the delivery elbow; on the other hand, since the inner surface of each support tube is smaller than the inner surface of the integral outer tube The smaller inner surface also facilitates the fabrication of the support tube. For the above two reasons, the technical solution provided by the present invention can reduce the manufacturing cost of the conveying elbow under the premise of ensuring wear resistance, strength, high toughness and impact resistance, and meeting actual needs.

In a further technical solution, the support tubes are fixed together by welding; this ensures the strength of the outer tubes to ensure the overall strength of the transport elbows.

In a further technical solution, the outer tube end portion has a radially protruding inner convex body, and the inner tube and the outer tube are mutually positioned by the inner convex body; the technical solution can facilitate the installation of the inner tube and the outer tube, When installing, no additional positioning aid is needed; this can reduce the auxiliary equipment needed to make the transport elbow, simplify the production process of the transport elbow, and reduce the production of the transport elbow. Cost.

In a further technical solution, the adhesive layer formed by the adhesive acts as a filling layer, which not only transmits the force of the inner tube to the outer tube, but also ensures the support and protection of the outer tube to the inner tube; and can also improve the conveying curve. The safety performance of the pipe. The reason for improving the safety performance of the conveying elbow is: Because the bonding layer has adhesive property and shear resistance, the adhesive layer can keep the remaining part and the outer tube fixed when the inner tube is partially worn during use, avoiding The clogging of the conveying pipe caused by the falling of the inner pipe keeps the conveying pipe unobstructed, reduces the burst caused by the clogging, and improves the safety performance of the conveying elbow. The injection hole is disposed on the outer tube, which facilitates the injection of the adhesive, thereby facilitating the production of the transport elbow. Since the injection hole of the adhesive injection hole has a small aperture, the strength of the outer tube can be ensured, and further Ensure the overall strength of the conveying elbow.

In a further technical solution, a flow guiding groove is arranged on the inner surface of the outer tube to ensure smooth flow of the adhesive in the annular space formed by the outer tube and the inner tube, and on the one hand, the adhesive can better fill the entire annular space. On the other hand, the uniformity of the bonding layer can be ensured, the support of the outer tube to the inner tube and the protection function can be ensured, and the overall strength of the conveying elbow can be ensured; in a further technical solution, the outer surface of the inner tube can also be appropriately set. a flow guiding groove to further promote the flow of the adhesive; and the flow guiding groove may be spirally extended on the outer surface of the inner tube and the inner surface of the outer tube, so that not only the adhesive can flow in the circumferential direction, A uniform arrangement in the circumferential direction is achieved, and the flow of the adhesive can also be achieved in the longitudinal direction so that the adhesive layer has uniformity in the longitudinal direction.

In a further technical solution, a thinner conveying elbow of the bonding layer is obtained by the combination of the above technical features, and the maximum thickness of the bonding layer is less than 3 mm; the technical solution can reduce the weight of the conveying elbow on the one hand, and facilitate the concrete. The arrangement of the conveying pipe, on the other hand, can reduce the contour size of the conveying elbow and facilitate the arrangement of the concrete conveying pipe; the combination of these two aspects can transport the concrete to a farther place and higher, for the concrete construction work. Convenience.

Since the outer tube includes more than two supporting tubes in the present invention, in a further technical solution, the inner tube can be set to a structure having different wall thicknesses according to the wear law of the inner tube, thereby realizing the life of the inner tube. Design, the technical solution can make full use of the wear-resistant material of the inner tube, reduce the waste of the wear-resistant material, and on the other hand, prolong the service life of the transport elbow. The combination of these two aspects can greatly reduce the transport elbow. Production costs and usage costs.

Providing the concrete conveying with the above-mentioned conveying elbow on the basis of providing the above-mentioned conveying elbow The delivery machine also has a corresponding technical effect.

The method for manufacturing a conveying elbow provided by the present invention, since the outer tube comprises more than two supporting tubes, the supporting tube can be conveniently sleeved outside the inner tube; and since the inner tube and the outer tube can pass through the inner convex body Realizing each other's positioning not only simplifies the manufacturing process when making the conveying elbow, but also reduces the auxiliary machinery and reduces the manufacturing cost of the conveying elbow. DRAWINGS

The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

1 is a schematic structural view of a curved pipe disclosed in Chinese Patent Document CN 101107187; FIG. 2 is a schematic cross-sectional structural view of a conveying elbow provided by Embodiment 1 of the present invention;

Figure 3 is a cross-sectional view of the A-A of Figure 2, for the sake of clarity, the figure omits the section line;

4 is an enlarged view of a portion I-I of FIG. 2, which shows a cross-sectional structure of one end of the conveying elbow in the first embodiment of the present invention;

Figure 5 is a B-direction view of Figure 4, which shows a structural schematic view of the end face of the conveying elbow; Figure 6 shows another structural schematic view of the end face of the conveying elbow;

Figure 7 is an enlarged view of a portion of the Π-Π in Figure 2;

Figure 8 is a cross-sectional structural view of the support tube;

Figure 9 is an enlarged view of a portion of the ΠΙ-ΠΙ in Figure 2;

Fig. 10 is a flow chart showing a method of manufacturing a conveying elbow provided by the present invention. detailed description

The invention is described in detail below with reference to the accompanying drawings, and the description of the present invention is merely exemplary and illustrative, and should not be construed as limiting the scope of the invention.

For the convenience of description, in this document, the plane passing through the center line of the conveying elbow is taken as the reference plane, and both sides of the reference plane are the sides of the conveying elbow; the cylindrical surface perpendicular to the reference plane and passing through the center line of the conveying elbow is used as a reference. For the curved surface, the inner tube portion in the reference surface is the inner arc portion, and the inner tube portion outside the reference surface is the outer arc portion.

Please refer to FIG. 2 , which is a cross-sectional structural view of a conveying elbow provided by Embodiment 1 of the present invention. The conveying elbow provided in the first embodiment comprises an inner tube 200, an adhesive layer 300 and an outer tube 400; the inner tube 200 has high hardness and high wear resistance, and can be made of a wear-resistant material such as alloy or ceramic. The bonding layer 300 is located between the outer tubes 400 of the inner tube 200 to form a filling layer for conveying the elbows, and the outer tube 400 includes two supporting tubes 410 made of a material having high toughness, high strength, and impact resistance. The two support tubes 410 are opposite each other at the H in the figure and are fixed together by welding; it can be understood that selecting a suitable welding method can reduce or avoid the heat generated by the welding to adversely affect the hardness of the inner tube 200, so as to ensure a low internal The wear resistance of the tube 200. In this example, the two support tubes 410 are arranged symmetrically and are butted and fixed at the intermediate portion of the transport elbow.

The benefit of the outer tube 400 including the two support tubes 410 is that, on the one hand, since the two support tubes 410 can be respectively sleeved outside the inner tube 100, the two support tubes 410 are fixed together, so that the support tube 410 can be lowered. The assembly dimensional accuracy requirement; on the other hand, since the inner surface of the support tube 410 is smaller than the inner surface of the integral outer tube 400, the smaller inner surface can facilitate the fabrication of the support tube 410. The combination of the above two aspects, the conveying elbow in the first embodiment can reduce the manufacturing cost of the conveying elbow on the premise of meeting the actual needs. It can be understood that the outer tube 400 is not limited to include two support tubes 410, and may also include more support tubes 410. The support tubes 410 may be the same or different to meet actual needs; in addition, the two support tubes 410 are fixed by welding. It is a preferred technical solution, and the manner in which they are fixed to each other is not limited to being welded, and may be fixed by other means.

In the first embodiment, the outer tube 400 for conveying the elbow includes two supporting tubes 410. Therefore, when installing, the supporting tube 410 can be easily sleeved outside the inner tube 200, and then the outer tube 400 is formed to realize the conveying bending. Tube fabrication; since the two support tubes 410 can be respectively sleeved from the two ends of the inner tube 200, the intermediate portion of the outer surface of the inner tube 200 may have a larger outline size and may be non-parallel to its inner surface so that The wall of each part of the inner tube 200 has different thicknesses to conform to the wear law of the inner tube 200, and the life of the inner tube 200 is designed.

The inner wall of each inner tube 200 has different thicknesses, and the realization of the same life design mainly includes two aspects, one is that the thickness of the radial wall is not equal; on the other hand, the thickness of the wall along the center line of the conveying elbow Not waiting for design.

As shown in FIG. 3, the figure is a schematic cross-sectional view taken along line AA of FIG. 2. For the sake of clarity, the figure omits the hatching. The inner wall portion 220 of the inner tube 200 has a minimum thickness of HI, and the outer wall portion 210 has a maximum thickness of H2, wherein Η2>Η1, in this example, H2=2H1. A preferred technical solution is: between the thinnest portion of the inner arc portion 220 and the thickest portion of the outer arc portion 210 In the transition portion, the thickness of the inner wall of the inner tube 200 is gradually increased, that is, from the inner side of the inner tube 200 to the outer side of the center line, the thickness of the inner tube 200 is gradually increased. The significance of the technical solution is as follows: Since the concrete mud passes through the conveying elbow, the change of the flow direction causes a large impact on the outer arc portion 210 of the conveying elbow, and the outer arc portion 210 of the inner tube 200 wears much faster than the inner portion. The wear speed of the arc portion 220; the thickness of the outer arc portion 210 is greater than the thickness of the inner arc portion 220, and the equal life design of the outer arc portion 210 and the inner arc portion 220 can be realized, thereby maximally utilizing the wear resistant material, and more The wear-resistant material is disposed at a position where the wear is fast; from the inner side of the inner tube 200 to the outer side of the center line, the thickness of the inner wall of the inner tube 200 is gradually increased, so that the wall thickness of the inner tube 200 can be more closely matched to the wear. Regular requirements. According to the same principle, the change of the flow direction of the concrete slurry also has a corresponding difference between the impact of the end portions of the outer arc portion 210 and the impact on the intermediate portion, and the wear speed of the both end portions is also different from the wear speed of the intermediate portion. The thickness of the two ends and the intermediate portion of the outer arc portion 210 may be set to different thicknesses. Referring to FIG. 2, the preferred technical solution is: from both ends to the middle portion, the thickness of the outer arc portion 210 is gradually increased. increase. It can be understood that those skilled in the art can design the appropriate positions of the inner arc portion 220 and the outer arc portion 210 to an appropriate thickness according to actual needs, so that the inner tube 200 can be adapted to the needs of conveying different quality concrete. The equal life design of the above two aspects can fully utilize the wear-resistant material of the inner tube while maintaining the weight of the wear-resistant conveying elbow, reduce the waste of the wear-resistant material, and greatly improve the wear-resistant conveying bend. The service life of the pipe; in one embodiment, it is proved that, in the case of the same weight and the same wear-resistant material, the service life of the conveying elbow having the above-mentioned unequal wall thickness is the service life of the elbow in the prior art. - 3 times.

In order to facilitate the assembly of the conveying elbow, the conveying elbow in the first embodiment is further provided with a positioning mechanism to ensure the concentricity of the inner tube 200 and the outer tube 400 to prevent the two from being misaligned. As shown in Fig. 4, the figure is an enlarged view of a portion II of Fig. 2, which shows a cross-sectional structure of one end of the conveying elbow in the first embodiment of the present invention. In the first embodiment, the end of the outer tube 400 has a radially protruding inner protrusion 401; the end of the inner tube 200 has a radially concave inner recess (in the figure, the inner recess coincides with the inner protrusion 401, Illustrated by the indicia, after the outer tube 400 is placed over the inner tube 200, the inner convex body 401 is engaged with the inner concave opening, thereby realizing the positioning of the outer tube 400 and the inner tube 200 with each other; it can be understood that the inner convex body can be made The top and the inner side of the 401 are respectively engaged with the bottom surface and the side surface of the inner recess to simultaneously position the outer tube 400 and the inner tube 200 in the radial and midline directions. In this way, when assembling the transport elbow, there is no need To center the auxiliary mechanism, the concentricity of the outer tube 400 and the inner tube 200 can also be ensured to prevent misalignment; therefore, the conveying elbow of the structure has the characteristics of convenient installation, which not only simplifies the manufacturing process, reduces the cost, but also improves the conveying. The production efficiency of the elbow. It can be understood that the specific cooperation manner of the inner convex body 401 and the inner concave opening can be performed in various manners; the specific cooperation manner can be selected according to actual needs.

One way is that the outer tube 400 includes a plurality of inner protrusions 401 and is interrupted from each other. As shown in FIG. 5, FIG. 5 is a B-direction view of FIG. 4, which shows a structural schematic view of the end face of the conveying elbow; in the figure, the plurality of inner convex bodies 401 of the outer tube 400 are respectively radially extended. Out, and respectively cooperate with the inner recess of the end of the inner tube 200, the structure has the advantage that not only the positioning of the outer tube 400 and the inner tube 200 in the radial or midline direction but also the outer tube 400 and The circumferential direction of the inner tube 200 is positioned to prevent the outer tube 400 from rotating relative to the inner tube 200.

Another way is shown in Fig. 6. Fig. 6 shows another structural schematic view of the end face of the conveying elbow; in this figure, the inner convex body 401 projects radially to form a complete annular body, and the inner convex body Corresponding to 401, the inner notch is also a complete ring. The advantage of this structure is that the inner convex body 401 cooperates with the annular inner recess to not only achieve more reliable positioning of the outer tube 400 and the inner tube 200, but also facilitate the inner surface of the outer tube 400 and the outer surface of the inner tube 200. The annular space is sealed to reduce the precision of the size of the end of the inner tube 200 and the end of the outer tube 400, to prevent the adhesive from overflowing, and to facilitate the filling of the adhesive described below.

Referring to FIG. 2, a schematic cross-sectional view of the conveying elbow provided in the first embodiment of the present invention is shown. In the first embodiment, the adhesive layer 300 formed of an adhesive acts as a filling layer, and the adhesive layer 300 can not only transmit the force of the inner tube 200 to the outer tube 400, but also ensure the protection and support function of the outer tube 400 to the inner tube 200. Realized; can also improve the safety performance of the transport elbow. The reason for improving the safety performance of the conveying elbow is that: since the bonding layer 300 has adhesive properties and shear resistance; the bonding layer 300 can maintain the remaining of the inner tube 200 when a portion of the inner tube 200 is worn during use. Part of the fixing with the outer tube 400 prevents the inner tube 200 from falling off and causing blockage of the conveying elbow, keeping the conveying elbow unobstructed, reducing the possibility of the conveying elbow or the entire conveying tube bursting due to the blockage, thereby improving the safety of the conveying tube. performance.

In order to facilitate the filling of the adhesive and the formation of the adhesive layer 300, the outer tube 400 is also provided with a suitable injection hole. Figure 7, and referring again to Figure 2, Figure 7 is an enlarged view of the Π-Π portion of Figure 2; The figure shows the glue injection hole 411 through which the adhesive is injected into the annular space between the outer tube 400 and the inner tube 200 to form the adhesive layer 300. The significance of disposing the glue injection hole 411 on the outer tube 400 is that the injection of the adhesive can be facilitated to simplify the manufacturing process of the transfer bend.

Referring to the cross-sectional structural view of the support tube shown in FIG. 8, in order to further reduce the adverse effect of the injection hole 411 on the strength of the outer tube 400, the injection hole 411 may be disposed on the side of the outer tube 400, preferably The glue injection hole 411 is disposed at a predetermined outermost area on the side of the outer tube 400; when the concrete is conveyed, the deformation amount of the predetermined area is the smallest, and the generated stress is also small; where the injection hole 411 is provided to the support tube The influence of the intensity is minimal, and the predetermined area may be referred to as a micro-deformation zone; and the opening direction of the injection hole 411 is perpendicular to the plane passing through the center line of the conveying elbow; when the concrete is conveyed, the stress generated on the side of the outer tube 400 is relatively small. The injection hole 411 is disposed on the side surface, which can reduce the adverse effect of the injection hole 411 on the strength of the outer tube 400, so that the injection hole 411 is located in the micro deformation zone of the outer tube 400, and the opening direction and passage of the injection hole 411 The plane perpendicular to the center line of the conveying elbow can minimize the influence of the strength of the outer tube 400 and ensure the overall strength of the conveying elbow.

In order to allow the adhesive to uniformly fill the annular space between the outer tube 400 and the inner tube 200 when the adhesive is injected, a flow guiding groove 412 may be provided on the inner surface of the outer tube 400. Please refer to FIG. 7, FIG. 8 and FIG. 9. FIG. 7 is a partial enlarged view of the Π-Π in FIG. 2, FIG. 8 is a cross-sectional structural view of the support tube, and FIG. 9 is an enlarged view of the ΠΙ-ΠΙ portion in FIG. Figure. In order to better promote the flow of the adhesive in the annular space, in this example, the bottom wall of the flow guiding groove 412 is also intersected with the injection hole 411, so that the adhesive can pass after entering the injection hole 411. The flow guiding groove 412 flows in the circumferential direction, which not only advantageously ensures the quality of the bonding layer 300, but also improves the efficiency of injecting the adhesive and improves the efficiency of manufacturing the conveying elbow. It can be understood that, in order to better promote the flow of the adhesive, the quality of the uniformity of the adhesive layer 300 is increased, and the flow guiding groove 412 may be spirally extended on the inner surface of the outer tube 400; The fluidity of the adhesive in the circumferential direction; the flowability of the adhesive in the centerline direction can be improved, and the uniformity of the adhesive layer 300 can be improved; likewise, it can be understood that it can also be on the outer surface of the inner tube 200. The flow guiding groove 412 is provided. In order to make the adhesive more easily fill the annular space between the outer tube 400 and the inner tube 200, the outer surface of the inner tube 200 and the inner surface of the outer tube 400 may be provided with a flow guiding groove 412 at the same time. .

In one embodiment of the optimal structure of the above technical solution, the bonding elbow is bonded The thickness of the layer 300 ranges from 2-3 mm, which is smaller than the thickness of the filling layer of 4-7 mm in the prior art. Thus, the conveying elbow provided by the invention can reduce the weight of the conveying elbow and facilitate the arrangement of the concrete conveying pipe. On the other hand, it is also possible to reduce the contour size of the conveying elbow and facilitate the arrangement of the concrete conveying pipe; the combination of these two aspects can improve the conveying function of the concrete conveying machine and facilitate the concrete construction work.

In addition to providing the above-mentioned conveying elbow, the present invention also provides a concrete conveying machine comprising a concrete conveying pipe, the conveying pipe comprising a connecting conveying straight pipe and a conveying elbow, the conveying bending The pipe may be the above-mentioned conveying elbow, and the concrete conveying machine may be a concrete pump truck, a concrete cloth rack or the like. Since the wear-resistant conveying pipe provided by the present invention has the above technical effects, the concrete conveying machine with the wear-resistant conveying pipe also has a corresponding technical effect.

On the basis of providing the above-mentioned conveying elbow, the present invention also provides a method for manufacturing a conveying elbow, and a flow chart of a method for manufacturing a conveying elbow provided by the present invention as shown in FIG. 10, the method comprising the following steps:

S100, the support tube 410 is sleeved outside the inner tube 200. Since the outer tube 400 includes a plurality of support tubes 410, the support tube 410 can be made to have a lower dimensional accuracy to more easily fit the support tube 410 out of the inner tube 400 in a variety of ways.

S200, the support tube 410 is welded and fixed. The outer tube 400 may be formed by welding the support tubes 410 together; of course, when the outer tube 400 includes flanges or other components, it may also include fixing the contents of other components.

S300, the inner convex body 401 of the outer tube 400 is matched with the inner recess of the inner tube 200, so that the outer tube

The 400 and the inner tube 200 are positioned with each other and form an annular space between the outer tube 400 and the inner tube 200;

S400, an adhesive layer is formed by injecting an adhesive into the annular space in the injection hole 411. Since the inner tube 200 and the outer tube 400 can be positioned with each other by the cooperation of the inner convex body 401 and the inner concave hole, not only the auxiliary positioning mechanism can be reduced, but also the injection of the adhesive can be realized by a common glue injection gun, and the conveying bending is simplified. The manufacturing process of the tube reduces the manufacturing cost of the conveying elbow; preferably, the outer tube 400 includes two supporting tubes 410, and the opposite ends of the two supporting tubes 410 respectively have flanges, so that the flange and the supporting tube 410 As a one-piece structure, in the production of the conveying elbow, the manufacturing process of the conveying elbow can be made simpler.

The above description is only a preferred embodiment of the present invention, it should be noted that It will be apparent to those skilled in the art that modifications and modifications may be made without departing from the principles of the invention.

Claims

Rights request

I. A delivery elbow comprising an inner tube (200), an outer tube (400) and a filling layer between the inner tube (200) and the outer tube (400), characterized in that The outer tube (400) includes at least two support tubes (410) that are sequentially connected.

2. The delivery elbow according to claim 1, wherein said adjacent support tube

(410) Fixed together by welding.

3. The delivery elbow according to claim 2, wherein the end of the outer tube (400) further has a radially projecting inner protrusion (401).

The conveying elbow according to claim 1, 2 or 3, wherein the outer tube (400) has a glue injection hole (411), and the injection hole (411) penetrates the outer tube (400) The tube wall; the filling layer is an adhesive layer (300) formed of an adhesive.

5. The delivery elbow according to claim 4, wherein the inner surface of the outer tube (400) has a flow guiding groove (412).

6. The delivery elbow of claim 4, wherein the outer surface of the inner tube (200) has a flow guiding groove (412).

The transfer elbow according to claim 5 or 6, wherein the flow guiding groove (412) extends in a spiral shape.

8. The conveying elbow according to claim 7, wherein the bonding layer (300) has a maximum thickness of less than 3 mm.

The delivery elbow according to any one of claims 4-8, characterized in that the injection hole (411) is located in a microdeformation zone of the outer tube (400).

The conveying elbow according to any one of claims 1 to 9, characterized in that the inner arc portion (220) of the inner tube (200) has a wall thickness smaller than an outer arc portion of the inner tube (200). The wall thickness of (210), or from the inner side of the inner tube (200) to the outer side of the center line, the thickness of the inner tube (200) tube wall gradually increases.

II. The conveying elbow according to claim 10, wherein a thickness of both end portions of the outer arc portion (210) of the inner tube (200) is smaller than a thickness of an intermediate portion of the outer arc portion (210); or The thickness of the outer arc portion (210) of the inner tube (200) gradually increases from the both ends to the intermediate portion. 12. A concrete conveying machine, comprising a conveying pipe, the conveying pipe comprising a connecting conveying straight pipe and a conveying elbow, wherein the conveying elbow is any one of claims 1-11 Conveying the elbow.

13. A method of manufacturing a conveying elbow, comprising the steps of:

The support tube (410) is placed outside the inner tube (200);

The support tube (410) is welded and fixed to form an outer tube (400);

The outer tube (400) and the inner tube (200) are fixed to each other, and an annular space is formed between the outer tube (400) and the inner tube (200);

An adhesive layer (300) is formed by injecting an adhesive into the annular space through a glue injection hole (401).