WO2012083647A1

WO2012083647A1 - Concrete conveying pipe and manufacturing method thereof

Info

Publication number: WO2012083647A1
Application number: PCT/CN2011/075650
Authority: WO
Inventors: 秦建军; 张琦; 吴星荣
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: 2010-12-24
Filing date: 2011-06-13
Publication date: 2012-06-28
Also published as: CN102032397A; CN102032397B

Abstract

A concrete conveying pipe and a manufacturing method thereof are disclosed. The concrete conveying pipe with at least two bends includes an inner pipe (11) and an outer pipe (12) joined to the outside of the inner pipe (11). The outer pipe (12) comprises at least a first part and a second part. The cross-sections of the first part and the second part are both arc-shaped. The first part and the second part are connected to form the outer pipe (12). The abrasion performance of the inner pipe (11) is higher than that of the outer pipe (12) while the toughness of the outer pipe (12) is higher than that of the inner pipe (11). The concrete conveying pipe not only meets the requirement of the abrasion performance, but also meets the requirement of the mechanical strength.

Description

混凝土输送管及其制备方法本申请要求于 2010 年 12 月 24 日提交中国专利局、申请号为 201010606444.1、发明名称为"混凝土输送管及其制备方法"的中国专利申请的优先权，其全部内容通过引用结合在本申请中。技术领域 The present invention claims the priority of the Chinese patent application filed on December 24, 2010, the Chinese Patent Application No. 201010606444.1, entitled "Concrete Conveying Pipe and Its Preparation Method", the entire contents of which are incorporated herein by reference. This is incorporated herein by reference. Technical field

本发明涉及混凝土输送装置，具体涉及一种混凝土输送管及其制备方法。背景技术 The present invention relates to a concrete conveying apparatus, and in particular to a concrete conveying pipe and a method of preparing the same. Background technique

混凝土输送泵车 /拖泵是为建造高层楼盘等建筑物输送混凝土的关键设备，在混凝土输送泵车 /拖泵上用的 S管是一个关键部件，所述 S管是具有两个方向大致相反的弯部的输送管，该输送管从侧面看大致成 S型，是本领域技术人员熟知的混凝土输送部件。 S 管作为影响泵车寿命及使用稳定性的关键部件，其内表面直接与混凝土接触，在工作过程中，受到混凝土不断的冲刷，因此对 S管的性能提出了较高的要求。一般情况下，由于 S管的内表面不断受到混凝土的磨蚀，因此需要其内表面具有高的耐磨性；此外，由于 S管在泵送过程中不停摇摆切换运动方向，其受到混凝土的冲击力，因此也要求 S管具有良好的强度。 Concrete pump truck/trailer pump is the key equipment for transporting concrete for buildings such as high-rise buildings. The S-tube used in concrete pump/trailer pump is a key component. The S-tube is roughly opposite in two directions. The duct of the curved portion, which is generally S-shaped when viewed from the side, is a concrete conveying member well known to those skilled in the art. As the key component that affects the life and stability of the pump, the S pipe is directly in contact with the concrete. During the working process, the concrete is continuously washed away, so the performance of the S pipe is put forward. In general, since the inner surface of the S pipe is continuously abraded by concrete, it is required to have a high wear resistance on the inner surface thereof; in addition, since the S pipe is constantly swaying during the pumping process, it is subjected to the impact of concrete. Force, therefore also requires S tube to have good strength.

现有技术中，为了满足 S管的上述要求，一般选择具有良好强度的材料作为 S管外管，先采用模压的方式制成两个半管，然后采用堆焊的方式在 S管的内表面堆积耐磨层，从而提高 S管的耐磨性。现有技术的不足之处在于：（1 )堆焊所得 S管的内表面粗糙，流道阻力大，易引起堵管；（2 ) 堆焊质量难以控制，焊瘤、横向焊接裂纹等缺陷难以避免，威胁工件使用寿命；（3 )堆焊的生产效率低，生产成本高；（4 )堆焊工艺可控性差，焊接操作难以量化，易造成堆焊合金的化学成分和性能变化，难以保证焊层厚度及均匀性；（5 ) S 管两端最易磨损部位可能因为焊不满而导致寿命缩短；（6 ) 管壁坯料较厚，因此堆焊层的厚度有限，从而大大影响了 S管的使用寿命。 In the prior art, in order to meet the above requirements of the S tube, a material having good strength is generally selected as the outer tube of the S tube, and two half tubes are first formed by molding, and then the inner surface of the S tube is deposited by surfacing. The wear layer is deposited to improve the wear resistance of the S tube. The shortcomings of the prior art are as follows: (1) The inner surface of the S pipe obtained by surfacing welding is rough, the flow path resistance is large, and the pipe is easily blocked; (2) the quality of the surfacing is difficult to control, and the defects such as the weld bead and the transverse welding crack are difficult to be Avoid, threaten the service life of the workpiece; (3) The production efficiency of surfacing is low and the production cost is high; (4) The controllability of the surfacing process is poor, the welding operation is difficult to quantify, and the chemical composition and performance of the surfacing alloy are easily changed, which is difficult to guarantee. Thickness and uniformity of the weld layer; (5) The most wearable part of the S pipe may be shortened due to insufficient welding; (6) The wall blank is thick, so the thickness of the weld overlay is limited, which greatly affects the S pipe. of Service life.

本发明人考虑，可以采用提供一种输送混凝土的 S管，该 S管的内管使用耐磨材料，外管使用强度高的材料。这样，该 S管的内表面可以满足混凝土输送管的耐磨性要求，而外管可以满足混凝土输送管的强度要求。 The inventors considered that it is possible to provide an S pipe for conveying concrete, the inner pipe of which is made of a wear resistant material, and the outer pipe is made of a material having high strength. Thus, the inner surface of the S pipe can meet the wear resistance requirements of the concrete pipe, and the outer pipe can meet the strength requirements of the concrete pipe.

现有技术中，已经公开了多种复合管的制备方法，例如采用内管和外管过盈配合的方式制备直的复合管、利用热塑变形的加工方式制备弯管，但是这些方法却不适用于制备输送混凝土的 S管。主要原因如下，由于 S 管具有两个变截面弯部，因此内管和外管无法采用过盈配合的方式复合在一起。此外，还可以考虑先采用过盈配合的方式制备复合锥管然后加热弯曲成型也能得到 S管，但该方法制备的 S管同样不能满足要求，由于复合的锥管经过两次弯曲成型后，内管和外管的变形不一致，因此弯曲部很容易失效。 In the prior art, various methods for preparing a composite pipe have been disclosed, for example, a straight composite pipe is prepared by an interference fit between an inner pipe and an outer pipe, and a bend is prepared by a thermoplastic deformation process, but these methods are not Suitable for the preparation of S pipes for conveying concrete. The main reason is as follows. Since the S tube has two curved portions with a variable cross section, the inner tube and the outer tube cannot be combined together by an interference fit. In addition, it is also conceivable to prepare the composite cone tube by means of interference fit and then obtain the S tube by heating and bending. However, the S tube prepared by the method can not meet the requirements, because the composite cone tube is formed by two bending processes. The deformation of the inner tube and the outer tube are inconsistent, so the bent portion is easily broken.

发明内容 Summary of the invention

本发明解决的技术问题在于提供一种混凝土输送管及其制备方法，与现有技术相比，本发明通过提供的混凝土输送管制备工艺筒单，成本低，既能满足内表面具有高的耐磨性的要求，而且也能够满足整体强度要求。 The technical problem to be solved by the invention is to provide a concrete conveying pipe and a preparation method thereof. Compared with the prior art, the invention provides a process for preparing a concrete pipe through a concrete pipe, which has low cost and can meet the high resistance of the inner surface. Grindability requirements, but also to meet the overall strength requirements.

为了解决以上技术问题，本发明提供一种混凝土输送管，所述混凝土输送管具有至少两个弯部，包括： In order to solve the above technical problems, the present invention provides a concrete conveying pipe having at least two bent portions, including:

内管和复合在所述内管外面的外管，所述外管由至少外管第一部分和外管第二部分组成，所述外管第一部分的横截面形状和所述外管第二部分的横截面形状均为圆弧形状，所述外管第一部分和所述外管第二部分连接形成所述外管； An inner tube and an outer tube composited outside the inner tube, the outer tube being composed of at least a first portion of the outer tube and a second portion of the outer tube, a cross-sectional shape of the first portion of the outer tube and a second portion of the outer tube The cross-sectional shape is a circular arc shape, and the first portion of the outer tube and the second portion of the outer tube are joined to form the outer tube;

所述内管的耐磨性高于外管，所述外管的韧性高于所述内管的韧性。优选的，所述内管的材质为中碳低合金钢、高速钢、耐磨铸铁、合金铸铁、耐磨铸钢或工具钢。 The inner tube has higher wear resistance than the outer tube, and the outer tube has higher toughness than the inner tube. Preferably, the inner tube is made of medium carbon low alloy steel, high speed steel, wear resistant cast iron, alloy cast iron, wear resistant cast steel or tool steel.

优选的，所述外管为普通碳素钢、低合金钢或不锈钢。 Preferably, the outer tube is ordinary carbon steel, low alloy steel or stainless steel.

优选的，所述混凝土输送管为用于混凝土泵车、车载泵等泵送车辆中的 S管。优选的，所述 S管为变截面的 S管。 Preferably, the concrete conveying pipe is an S pipe used in a pumping vehicle such as a concrete pump truck or a vehicle pump. Preferably, the S tube is a S tube of variable cross section.

优选的，所述内管的内表面硬度高于 HRC50。 Preferably, the inner surface of the inner tube has a hardness higher than HRC50.

优选的，所述外管的屈服强度优选 > 235MPa, 伸长率 > 12%。 Preferably, the outer tube has a yield strength of preferably > 235 MPa and an elongation of > 12%.

优选的，所述内管和外管的厚度比为 1 : 5-5: 1。 Preferably, the inner tube and the outer tube have a thickness ratio of 1:5-5:1.

优选的，所述内管和外管之间有粘接剂。 Preferably, there is an adhesive between the inner tube and the outer tube.

本发明还提供一种上述混凝土输送管的制备方法，包括： The invention also provides a preparation method of the above concrete conveying pipe, comprising:

模压制备内管第一部分和内管第二部分，所述内管第一部分和内管第二部分的横截面形状均为圆弧形，将所述内管一部分和内管第二部分焊接得到内管； Compressing the first portion of the inner tube and the second portion of the inner tube, the cross-sectional shape of the first portion of the inner tube and the second portion of the inner tube are both arc-shaped, and a part of the inner tube and the second portion of the inner tube are welded to obtain Tube

提供外管第一部分和外管第二部分，将所述外管第一部分和外管第二部分贴合在所述内管外，然后采取焊接的方式连接得到复合在所述内管外面的外管。 Providing a first portion of the outer tube and a second portion of the outer tube, the first portion of the outer tube and the second portion of the outer tube are attached to the outside of the inner tube, and then joined by welding to obtain an outer layer outside the inner tube tube.

优选的，还包括对所述混凝土输送管进行热处理的步骤。 Preferably, the method further comprises the step of heat treating the concrete conveying pipe.

优选的，还包括在所述内管和外管之间的间隙中灌注粘接剂的步骤。本发明提供了用于输送混凝土的输送管，所述输送管包括内管和复合在所述外管外面的外管。与现有技术相比，本发明无需采用价格昂贵的堆焊方式来提高混凝土输送管的耐磨性，而是通过提供一个具有很好的耐磨性的内管和复合在所述内管外的具有很好强韧性的外管的目的使得复合管既能满足耐磨性的要求，也能满足机械强度的要求。附图说明 Preferably, the method further comprises the step of injecting an adhesive into the gap between the inner tube and the outer tube. The present invention provides a delivery tube for conveying concrete, the delivery tube comprising an inner tube and an outer tube recombined outside the outer tube. Compared with the prior art, the invention does not need to adopt an expensive surfacing method to improve the wear resistance of the concrete conveying pipe, but provides an inner tube with good wear resistance and is compounded outside the inner tube. The purpose of the outer tube with good toughness makes the composite tube meet the requirements of wear resistance and mechanical strength. DRAWINGS

图 1为本发明实施例 1制备的混凝土输送管的外管半管示意图；图 2为本发明实施例 1制备的混凝土输送管的剖面示意图。 BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a half tube of an outer tube of a concrete conveying pipe prepared in Example 1 of the present invention; and Fig. 2 is a schematic cross-sectional view showing a concrete conveying pipe prepared in Example 1 of the present invention.

具体实施方式 detailed description

本发明提供一种混凝土输送管，所述混凝土输送管具有至少两个弯部，包括： The present invention provides a concrete conveying pipe having at least two bends, including:

内管和复合在所述内管外面的外管，所述外管由至少外管第一部分和外管第二部分组成，所述外管第一部分的横截面形状和所述外管第二部分的横截面形状均为圆弧形状，所述外管第一部分和所述外管第二部分连接形成所述外管；所述内管的耐磨性高于所述外管的耐磨性，所述外管的韧性高于所述内管的韧性。 An inner tube and an outer tube composited outside the inner tube, the outer tube being composed of at least a first portion of the outer tube and a second portion of the outer tube, a cross-sectional shape of the first portion of the outer tube and a second portion of the outer tube The cross-sectional shape is a circular arc shape, and the first portion of the outer tube and the second portion of the outer tube are joined to form the outer tube; the wear resistance of the inner tube is higher than the wear resistance of the outer tube, The toughness of the outer tube is higher than the toughness of the inner tube.

按照本发明，所述混凝土输送管的弯部可以为两个或两个以上，所述混凝土输送管优选为本领域技术人员熟知的用于混凝土泵车 /拖泵中的 S 管。本发明提供的输送管包括内管和复合在所述内管外面的外管，由于内管的耐磨性高于外管的耐磨性，因此可以提高输送管的磨损寿命；同时，外管的韧性高于内管的韧性，因此可以提高输送管的机械性能。 According to the invention, the concrete conveying pipe may have two or more bends, and the concrete conveying pipe is preferably an S pipe used in a concrete pump truck/tump pump which is well known to those skilled in the art. The conveying pipe provided by the invention comprises an inner tube and an outer tube compounded on the outer surface of the inner tube. Since the wear resistance of the inner tube is higher than the wear resistance of the outer tube, the wear life of the conveying tube can be improved; The toughness is higher than the toughness of the inner tube, so the mechanical properties of the delivery tube can be improved.

本发明所述 S管优选为变截面的 S管，变截面的 S管是指 S管的直径是连续变化的。由于变截面的 S管直径是连续变化的，因此不能按照现有技术的方式采用内管和外管过盈配合或者热塑性变形的方式进行加工。按照本发明提供的方法制备变截面的 S管时，可以使外管与内管紧密贴合，达到更好的复合效果。 The S tube of the present invention is preferably a S tube having a variable cross section, and the S tube having a variable cross section means that the diameter of the S tube is continuously changed. Since the diameter of the S-tube of variable cross-section is continuously variable, it cannot be processed in the manner of the prior art by means of interference fit or thermoplastic deformation of the inner and outer tubes. When the S tube having a variable cross section is prepared according to the method provided by the present invention, the outer tube and the inner tube can be closely adhered to achieve a better composite effect.

本发明中的内管的硬度优选高于 HR50 , 更优选高于 HRC55 , 更优选高于 HRC60, 制备内管的材料的例子优选为中碳低合金钢、高速钢、耐磨铸铁、合金铸铁、耐磨铸钢、工具钢等，但不限于此，只要能够满足上述要求的硬度即可。本发明中的外管屈服强度优选> 235^^ ,伸长率 > 12%, 屈服强度更优选高于 345MPa,伸长率优选 > 15%; 制备外管的材料的例子可以为普通碳素钢、低合金钢或不锈钢等，但不限于此，只要能够满足上述要求的强度和韧性即可。 The hardness of the inner tube in the present invention is preferably higher than HR50, more preferably higher than HRC55, more preferably higher than HRC60. Examples of the material for preparing the inner tube are preferably medium carbon low alloy steel, high speed steel, wear resistant cast iron, alloy cast iron, Wear-resistant cast steel, tool steel, etc., but are not limited thereto, as long as the hardness can satisfy the above requirements. The outer tube yield strength in the present invention is preferably > 235^^, the elongation is >12%, the yield strength is more preferably higher than 345 MPa, and the elongation is preferably >15%; the example of the material for preparing the outer tube may be ordinary carbon steel. , low alloy steel or stainless steel, etc., but is not limited thereto, as long as the strength and toughness satisfying the above requirements can be satisfied.

按照本发明，使用耐磨铸铁作为内管材料时，耐磨铸铁的典型成分以重量百分计包括： 2%~3%的 C、 < 1.2%的 Si、 < 2%的 Mn, P与 S的和 0.06%, 23%-30%的 Cr、 3.0%的 Mo、 2.0%的 Cu、 2.5%的 Ni, 余量为 Fe; 本发明所述抗磨铸铁不限于以上成分。对于所述抗磨铸铁的硬度优选> 581¾(^, 更优选 > 60HRC。 According to the present invention, when wear-resistant cast iron is used as the inner tube material, the typical composition of the wear-resistant cast iron includes, by weight: 2% to 3% of C, < 1.2% of Si, < 2% of Mn, P and S And 0.06%, 23%-30% Cr, 3.0% Mo, 2.0% Cu, 2.5% Ni, and the balance is Fe; the anti-wear cast iron of the present invention is not limited to the above components. The hardness of the anti-wear cast iron is preferably > 5813⁄4 (^, more preferably > 60HRC).

按照本发明，使用高速钢作为内管材料时，高速钢的典型成分以重量百分比计包括： 0.97%~1.05%的 C、 0.2%~0.55%的 Si、 0.15%~0.4%的 Mn, 8.2%~9.2%的 Mo、 3.5%~4.0%的 Cr, 1.75%~2.25%的 V、 1.4%~2.1%的 W、 S与 P的和 0.03%, 余量为 Fe; 本发明所述高速钢不限于以上成分。对于所述高速钢的硬度优选 > 62HRC , 更优选 > 65HRC。 According to the present invention, when high speed steel is used as the inner tube material, the typical composition of the high speed steel includes, by weight percentage: 0.97% to 1.05% of C, 0.2% to 0.55% of Si, 0.15% to 0.4% of Mn, and 8.2%. ~9.2% Mo, 3.5%~4.0% Cr, 1.75%~2.25% V, 1.4%~2.1% W, S and P and 0.03%, the balance is Fe; the high speed steel of the present invention does not Limited to the above ingredients. Correct The hardness of the high speed steel is preferably > 62 HRC, more preferably > 65 HRC.

按照本发明，使用低合金钢作为外管材料时，低合金钢的典型成分以重量百分比计包括 0.35%~0.45%的 C、 0.17%~0.37%的 Si、 0.50%~0.80%的 Cr、 S与 P的和 0.04%, 余量为 Fe; 本发明所述低合金钢不限于以上成分。 According to the present invention, when low alloy steel is used as the outer tube material, the typical composition of the low alloy steel includes 0.35% to 0.45% of C, 0.17% to 0.37% of Si, and 0.50% to 0.80% of Cr, S by weight percentage. The sum with P is 0.04%, and the balance is Fe; the low alloy steel of the present invention is not limited to the above components.

按照本发明，使用碳素钢作为外管材料时，碳素钢的典型成分以重量百分比计包括： 0.45%~0.55%的 C、 0.55~0.65%的 Si、 0.8~1.0%的 Mn% , S 与 P的和 0.04%, 余量为 Fe; 本发明所述碳素铸钢不限于以上成分。 According to the present invention, when carbon steel is used as the outer tube material, the typical composition of the carbon steel includes, by weight percentage: 0.45% to 0.55% of C, 0.55 to 0.65% of Si, and 0.8 to 1.0% of Mn%, S. The sum with P is 0.04%, and the balance is Fe; the carbon cast steel of the present invention is not limited to the above components.

本发明中，对于所述内管和外管的厚度比，优选为 1 : 5~5： 1 , 更优选为 1 : 4~4： 1 , 更优选为 1 : 3~3： 1 , 对于内管或外管的实际厚度，可以根据实际需要进行设计，对此本发明并无特别限制。 In the present invention, the thickness ratio of the inner tube and the outer tube is preferably 1:5 to 5:1, more preferably 1:4 to 4:1, more preferably 1:3 to 3:1, for the inner The actual thickness of the tube or the outer tube can be designed according to actual needs, and the present invention is not particularly limited.

与现有技术中的 S管相比，本发明无需采用价格昂贵的堆焊方式来改变 S管的耐磨性，而是通过提供一个具有很好的耐磨性的内管和复合在所述内管外的具有很好强韧性的外管的目的使得复合管既能满足耐磨性的要求，也能满足机械强度的要求。显然，本发明提供的输送管的成本更低，而且耐磨性性能不受耐磨层的局限，由内管的厚度所决定，因此具有更好的耐磨性。另外，本发明选用外管时，可以选择强度尽可能高的外管，而无需像现有技术那样要综合考虑所选用的管材是否适合堆焊等问题，因此本发明可以选用强度更高的外管来提高复合管的机械性能，同时采取内管材料非等厚设计，可在易损部位提高其厚度，从而延长复合管的使用寿命。 Compared with the S tube in the prior art, the present invention does not need to use an expensive surfacing method to change the wear resistance of the S tube, but by providing an inner tube with good wear resistance and compounding in the The purpose of the outer tube with good toughness outside the inner tube makes the composite tube meet the requirements of wear resistance and mechanical strength. It will be apparent that the delivery tube of the present invention is less costly and that the wear resistance properties are not limited by the wear layer and are determined by the thickness of the inner tube, thereby providing better wear resistance. In addition, when the outer tube is selected in the present invention, the outer tube having the highest strength can be selected, and it is not necessary to comprehensively consider whether the selected tube is suitable for surfacing or the like as in the prior art, so that the present invention can select a stronger outer surface. The tube is used to improve the mechanical properties of the composite pipe, and at the same time, the non-equal thickness design of the inner pipe material can be used to increase the thickness of the composite pipe, thereby prolonging the service life of the composite pipe.

此外，现有技术中采用堆焊方式增强 S管内壁的耐磨性时，会存在焊瘤、焊渣等焊接质量问题，这样会增加流道的阻力，从而影响混凝土的输送。本发明的内管内表面光滑，流道阻力小，有利于输送混凝土。并且，本发明制备的输送管是由内管和外管复合而成的，因此可以保持内管或外管的成分、性能稳定，从而使输送管的寿命稳定，从而避免在复杂的堆焊工艺中产生焊接结合面的位置和厚度不能精确控制、壁厚不均等局部失效问题导致的影响整个输送管寿命的问题。 In addition, in the prior art, when the wear resistance of the inner wall of the S pipe is enhanced by the overlay welding method, there are welding quality problems such as weld beads and welding slag, which increases the resistance of the flow passage and affects the concrete transportation. The inner tube of the invention has a smooth inner surface and a small flow passage resistance, which is favorable for conveying concrete. Moreover, the conveying pipe prepared by the invention is composed of an inner tube and an outer tube, so that the composition and performance of the inner tube or the outer tube can be kept stable, thereby stabilizing the life of the conveying tube, thereby avoiding complicated welding process. The problem that the position and thickness of the welded joint surface cannot be accurately controlled, the wall thickness is uneven, and the local failure problem affects the life of the entire duct.

按照本发明，制备所述输送管时，可以采用多种方法来制备，其中，本发明提供的输送管制备方法的第一个实施方案包括：提供内管； According to the present invention, when the delivery tube is prepared, it can be prepared by various methods, wherein the first embodiment of the delivery tube preparation method provided by the present invention comprises: Providing an inner tube;

提供外管第一部分和外管第二部分，将所述外管第一部分和外管第二部分贴合在所述内管外面连接得到复合在所述内管外面的外管。 A first portion of the outer tube and a second portion of the outer tube are provided, and the first portion of the outer tube and the second portion of the outer tube are attached to the outside of the inner tube to form an outer tube that is composited outside the inner tube.

其中，连接所述外管第一部分和外管第二部分时，优选采用焊接的方式。对于外管的组成部分，可以包括多个横截面形状为圆弧状的外管部分，所述多个外管部分的横截面围成圆形作为外管。按照本发明，将外管的多个组成部分焊接在内管外面得到复合管后，可以对复合管进行热处理，热处理可以根据外管和内管的不同材质采用本领域技术人员熟知的方式进行热处理。热处理之后，可以在外管和内管之间的间隙内灌注粘接剂，粘接剂可以为本领域技术人员熟知的用于连接金属件之间的粘接剂，具体例子可以为澳洲美高宝高分子耐磨胶，但不限于此。 Wherein, when the first portion of the outer tube and the second portion of the outer tube are joined, it is preferred to use a welding method. For the component of the outer tube, a plurality of outer tube portions having a circular arc shape in cross section may be included, and the cross sections of the plurality of outer tube portions are rounded as an outer tube. According to the present invention, after the plurality of components of the outer tube are welded to the outer tube to obtain a composite tube, the composite tube may be subjected to heat treatment, and the heat treatment may be performed according to different materials of the outer tube and the inner tube by means well known to those skilled in the art. . After the heat treatment, the adhesive may be poured into the gap between the outer tube and the inner tube, and the adhesive may be an adhesive for connecting the metal parts well known to those skilled in the art, and the specific example may be the Australian high-quality treasure. Polymer wear-resistant rubber, but is not limited to this.

对于构成外管的外管第一部分和外管第二部分的制备方法，可以按照外管的形状进行模压成型得到。本发明中，由于外管第一部分和外管第二部分可以分别模压成型，因此可以保证整个外管厚度的均勾性，从而保证整个混凝土输送管的使用寿命。 The preparation method of the first portion of the outer tube and the second portion of the outer tube constituting the outer tube can be obtained by press molding in accordance with the shape of the outer tube. In the present invention, since the first portion of the outer tube and the second portion of the outer tube can be separately molded, it is possible to ensure the uniformity of the thickness of the entire outer tube, thereby ensuring the service life of the entire concrete conveying tube.

对于内管的制备方法，可以采用一次铸造成型的方法得到，当然也可以先用模压成型得到内管第一部分和内管第二部分，所述内管第一部分和内管第二部分的横截面形状均为圆弧形，然后将所述内管第一部分和第二部分焊接在一起可以得到内管。 For the preparation method of the inner tube, it can be obtained by a single casting method. Of course, the first part of the inner tube and the second part of the inner tube can be obtained by press molding, and the cross section of the first part of the inner tube and the second part of the inner tube. The shapes are all circular arc shapes, and then the inner tube is obtained by welding the first portion and the second portion of the inner tube together.

本发明提供的方法制备的混凝土输送管由两种性能不同的材料构成，其中内管的耐磨性高于外管，而外管的强韧性好于内管的强韧性，这样可以得到内表面具有良好耐磨性而整体强度又能够满足使用要求的复合管，大大提高了砼输送的稳定性，而且提高了输送管的使用寿命。与现有技术相比，本发明提供的方法工艺筒单，而且由于无需采用堆焊的方法进行内表面强化，因此价格相对低廉。 The concrete conveying pipe prepared by the method provided by the invention is composed of two materials with different properties, wherein the inner tube has higher wear resistance than the outer tube, and the outer tube has better strength and toughness than the inner tube, so that the inner surface can be obtained. The composite pipe which has good wear resistance and the overall strength can meet the requirements of use greatly improves the stability of the conveyance of the concrete and improves the service life of the conveying pipe. Compared with the prior art, the method provided by the present invention has a single process, and is relatively inexpensive because it does not require a surfacing method for internal surface strengthening.

以下以具体实施例说明本发明的效果，但是本发明的保护范围不受以下实施例的限制。 The effects of the present invention will be described below by way of specific examples, but the scope of the present invention is not limited by the following examples.

以下实施例中所用的粘接剂为澳洲美高宝高分子耐磨胶，型号为 69G4。实施例 1 The adhesive used in the following examples was a Macao high-performance polymer wear-resistant adhesive, model 69G4. Example 1

选用抗磨铸铁作为内管材料，一次铸造成型得到内管，内管的成分以重量百分比计为： 3.1%的 C、 1.2%的 Si、 1.9%的 Mn、 0.035%的 S、 0.036 的 P、 2.8%的 Mo、 1.9%的 Cu、 2.4%的 Ni, 余量为 Fe。 The anti-wear cast iron is selected as the inner tube material, and the inner tube is obtained by one casting. The composition of the inner tube is as follows: 3.1% C, 1.2% Si, 1.9% Mn, 0.035% S, 0.036 P, 2.8% Mo, 1.9% Cu, 2.4% Ni, and the balance is Fe.

选用低合金钢作为外管材料，其成分以重量百分比计为： 0.375%的（、 0.35%的 Si、 0.65%的 Mn、 0.9%的 Cr、 0.035%的 S、 0.036的 P, 余量为 Low alloy steel is used as the outer tube material, and its composition is 0.375% (0.35% Si, 0.65% Mn, 0.9% Cr, 0.035% S, 0.036 P), and the balance is

Fe。 Fe.

采用模压的方法制备两个外管的半管，如图 1所示，为其中的一个半管的示意图。然后将所述两个半管包覆在内管的外面焊接在一起形成变截面的 S管，如图 2所示，变截面的 S管包括内管 11和复合在所述内管外面的外管 12。 The half tube of the two outer tubes is prepared by molding, as shown in Fig. 1, which is a schematic diagram of one of the tubes. The two half tubes are then welded to the outside of the inner tube to be welded together to form a variable-section S tube. As shown in FIG. 2, the variable-section S tube includes an inner tube 11 and a composite outer outside the inner tube. Tube 12.

热处理工艺为： 980°C x 3h 正火处理。然后在内管和外管之间填充粘接剂。 The heat treatment process is: 980 ° C x 3 h normalizing treatment. Then, an adhesive is filled between the inner tube and the outer tube.

取样性能测试：外管屈服强度为 345MPa、断裂强度为 625MPa、断裂伸长为 18%; 内管的冲击功为 29.8J, 内表面 HRC为 58。 Sampling performance test: The outer tube yield strength is 345 MPa, the breaking strength is 625 MPa, and the elongation at break is 18%; the impact energy of the inner tube is 29.8 J, and the inner surface HRC is 58.

实施例 2 Example 2

选用高速钢作为内管材料，其成分以重量百分计为： 0.98%的 C、 0.30% 的 Si、 0.16%的 Mn、 8.5%的 Mo、 3.7%的 Cr、 1.9%的 V、 1.5%的 W、 0.025% 的8、 0.028%的 P, 余量为 Fe。通过油压机将所述内管材料模压出 S管所要的弧度，分别形成两个内管半管，两个内管半管的内径均为 20mm。 High-speed steel is used as the inner tube material, and its composition is in weight percent: 0.98% C, 0.30% Si, 0.16% Mn, 8.5% Mo, 3.7% Cr, 1.9% V, 1.5% W, 0.025% of 8, 0.028% of P, the balance is Fe. The inner tube material is molded by the hydraulic press to the arc of the S tube, and two inner tube half tubes are respectively formed, and the inner diameters of the two inner tube and half tubes are both 20 mm.

选用碳素钢作为外管材料，其成分以重量百分比计为： 0.5%的 C、 0.6% 的 Si、 0.9%的 Mn、 0.035%的8、 0.036的 P, 余量为 Fe。通过油压机将所述外管材料模压出变截面的 S管所要的弧度，分别形成两个外管半管、将所述两个内管半管、两个外管半管焊接到一起，形成内管和包围在所述内管外的外管。 Carbon steel is used as the outer tube material, and its composition is 0.5% C, 0.6% Si, 0.9% Mn, 0.035% 8, 0.036 P, and the balance is Fe. The outer tube material is molded by a hydraulic press to the arc of the S tube having a variable cross section, and two outer tube half tubes are respectively formed, and the two inner tube half tubes and the two outer tube half tubes are welded together to form an inner tube. a tube and an outer tube surrounding the inner tube.

热处理工艺为：淬火 1190 °C X 2小时，回火 560 °C x l小时。 The heat treatment process is: quenching 1190 °C X 2 hours, tempering 560 °C x l hours.

取样性能测试，外管屈服强度为 310MPa、断裂强度为 570MPa、断裂伸长为 15%; 内管的冲击功为 30.1J/cm², 内表面 HRC为 64。 The sampling performance test showed that the outer tube yield strength was 310 MPa, the breaking strength was 570 MPa, and the elongation at break was 15%; the impact energy of the inner tube was 30.1 J/cm ² , and the inner surface HRC was 64.

以上对本发明提供的用于输送混凝土的输送管及其制备方法进行了详以上实施例的说明只是用于帮助理解本发明的方法及其核心思想。应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以对本发明进行若干改进和修饰，这些改进和修饰也落入本发明权利要求的保护范围内。 The above-mentioned conveying pipe for conveying concrete provided by the present invention and the preparation method thereof are detailed The above description of the embodiments is merely to assist in understanding the method of the present invention and its core idea. It should be noted that those skilled in the art can make various modifications and changes to the present invention without departing from the spirit and scope of the invention.

Claims

权利要求 Rights request

1、一种混凝土输送管，所述混凝土输送管具有至少两个弯部，其特征在于，包括： A concrete delivery pipe having at least two bends, comprising:

所述内管的耐磨性高于外管，所述外管的韧性高于所述内管的韧性。 The inner tube has higher wear resistance than the outer tube, and the outer tube has higher toughness than the inner tube.

2、根据权利要求 1所述的混凝土输送管，其特征在于，所述内管的材质为中碳低合金钢、高速钢、耐磨铸铁、合金铸铁、耐磨铸钢或工具钢。 The concrete pipe according to claim 1, wherein the material of the inner pipe is medium carbon low alloy steel, high speed steel, wear resistant cast iron, alloy cast iron, wear resistant cast steel or tool steel.

3、根据权利要求 1所述的混凝土输送管，其特征在于，所述外管为普通碳素钢、低合金钢或不锈钢。 The concrete pipe according to claim 1, wherein the outer pipe is ordinary carbon steel, low alloy steel or stainless steel.

4、根据权利要求 1所述的混凝土输送管，其特征在于，所述混凝土输送管为用于混凝土泵车、车载泵等泵送车辆中的 S管。 The concrete conveying pipe according to claim 1, wherein the concrete conveying pipe is an S pipe used in a pumping vehicle such as a concrete pump truck or a vehicle pump.

5、根据权利要求 4所述的混凝土输送管，其特征在于，所述 S管为变截面的 S管。 The concrete pipe according to claim 4, wherein the S pipe is a S pipe having a variable cross section.

6、根据权利要求 1至 5任一项所述的混凝土输送管，其特征在于，所述内管的内表面硬度高于 HRC50。 The concrete duct according to any one of claims 1 to 5, characterized in that the inner surface of the inner tube has a hardness higher than that of the HRC 50.

7、根据权利要求 6所述的混凝土输送管，其特征在于，所述外管的屈服强度 > 235MPa, 伸长率 > 12%。 The concrete duct according to claim 6, wherein the outer tube has a yield strength of > 235 MPa and an elongation of > 12%.

8、根据权利要求 1至 6任一项所述的混凝土输送管，其特征在于，所述内管和外管的厚度比为 1 : 5-5: 1。 The concrete duct according to any one of claims 1 to 6, wherein the inner tube and the outer tube have a thickness ratio of 1:5 to 5:1.

9、根据权利要求 1至 6任一项所述的混凝土输送管，其特征在于，所述内管和外管之间有粘接剂。 A concrete pipe according to any one of claims 1 to 6, wherein an adhesive is provided between the inner pipe and the outer pipe.

10、权利要求 1至 9任一项所述的混凝土输送管的制备方法，其特征在于，包括： The method of preparing a concrete conveying pipe according to any one of claims 1 to 9, characterized in that it comprises:

模压制备内管第一部分和内管第二部分，所述内管第一部分和内管第二部分的横截面形状均为圆弧形，将所述内管一部分和内管第二部分焊接得到内管；提供外管第一部分和外管第二部分，将所述外管第一部分和外管第二部分贴合在所述内管外，然后采取焊接的方式连接得到复合在所述内管外面的外管。 Compressing the first portion of the inner tube and the second portion of the inner tube, the cross-sectional shape of the first portion of the inner tube and the second portion of the inner tube are both arc-shaped, and a part of the inner tube and the second portion of the inner tube are welded to obtain tube; Providing a first portion of the outer tube and a second portion of the outer tube, the first portion of the outer tube and the second portion of the outer tube are attached to the outside of the inner tube, and then joined by welding to obtain an outer layer outside the inner tube tube.

11、根据权利要求 10所述的方法，其特征在于，还包括对所述混凝土输送管进行热处理的步骤。 11. The method of claim 10 further comprising the step of heat treating said concrete delivery tube.

12、根据权利要求 11所述的方法，其特征在于，还包括： 12. The method according to claim 11, further comprising:

在所述内管和外管之间的间隙中灌注粘接剂的步骤。 The step of injecting an adhesive into the gap between the inner tube and the outer tube.