CN116290788A - Concrete spreader bar, concrete pumping device, and method for manufacturing concrete spreader bar support and device thereof - Google Patents

Abstract

The invention provides a concrete spreader beam (12), the concrete spreader beam (12) is provided with a bracket (17), the bracket (17) is configured to support a hose (15) at the tail end of a concrete conveying pipe (11), and the bracket (17) is formed by a plurality of layers of composite pipes made of at least two layers of aluminum alloys which are arranged in a stacking way; the at least two layers of aluminum alloys comprise an outermost aluminum alloy (171) and an innermost aluminum alloy (173), wherein the outermost aluminum alloy (171) has better wear resistance and the innermost aluminum alloy (173) has higher rigidity; the support (17) of the invention improves the wear resistance and the bearing performance, lightens the weight, and improves the bearing performance and the service life of the concrete distributing rod (12).

Description

Concrete placing booms, concrete pumping equipment and supports for the manufacture of concrete placing booms racking method and equipment

technical field

The invention relates to the field of concrete pumping, in particular to a concrete distribution boom, concrete pumping equipment, and a method and device for manufacturing a concrete distribution boom support.

Background technique

Concrete pumping equipment outputs concrete and other materials through the rubber hose or hose at the end of the concrete delivery pipe. Especially the boom-type concrete pump truck needs to pass through long-distance delivery pipes to deliver materials to high-rise buildings for high-altitude concrete pouring operations. The higher the conveying height, the higher the price of concrete. Therefore, reducing the weight of the conveying mechanism is the way to increase the concrete conveying height and improve economic benefits. The boom bracket is used to support the conveying pipe on the boom, and is used to carry and support the conveying pipe, and the number is large and requires relatively high strength, toughness and rigidity. Since the hose at the end of the delivery pipe needs to be removed frequently, the high frequency of taking the hose will accelerate the wear of the bracket, and the bracket needs to have good wear resistance.

At present, the bracket of the concrete boom is usually formed by bending carbon steel or alloy steel pipe fittings, so the bracket has the characteristics of medium strength, high plasticity during cold deformation, good low temperature performance, weldability and machinability. At the same time, the steel bracket is suitable for welding on the steel boom. Steel brackets have problems such as heavy weight and limited conveying height.

In order to reduce the weight and increase the material conveying height, when the aluminum alloy boom is used, the steel bracket and the aluminum alloy boom cannot achieve high-quality connection due to poor welding quality of steel and aluminum. In addition, in the case of connecting by threaded connectors or riveting parts, the connection between the steel bracket and the aluminum alloy boom cannot withstand the high-frequency vibration and impact of the boom. There is a potential difference at the connection between the bracket with different base metals and the boom, which is easy to form electrochemical corrosion and damage the base material of the boom. If the bracket made of a single aluminum alloy is used, the wear resistance and load-bearing performance of the bracket are insufficient, which adversely affects the service life of the boom. Due to the frequent use of hoses during work, the wear on the surface of the steel bracket is relatively large. On the one hand, the surface coating of the steel bracket will be worn, resulting in corrosion of the steel bracket; on the other hand, the base material will be worn, causing the bracket Wear and tear occurs, accelerating failure, making the bracket need to be replaced frequently, and the customer experience is poor. Ordinary aluminum alloy is used to form the bracket by welding, which has the disadvantages of low welding strength, insufficient load-bearing performance, and non-wearable surface.

Contents of the invention

In order to improve the above technical defects, the present invention provides a concrete distribution boom, the concrete distribution boom is provided with a bracket, the bracket is configured to support the hose at the end of the concrete delivery pipe, and the bracket is made of at least two layers of aluminum alloys arranged in layers A multi-layer composite pipe is formed; at least two layers of aluminum alloys include the outermost layer of aluminum alloy and the innermost layer of aluminum alloy. Among the at least two layers of aluminum alloys, the outermost layer of aluminum alloy has better wear resistance, and the innermost layer of aluminum alloy Rigidity is greater.

In some embodiments of the present invention, the at least two layers of aluminum alloys further include an intermediate layer of aluminum alloy located between the innermost layer of aluminum alloy and the outermost layer of aluminum alloy. Layer aluminum alloys have greater strength and toughness.

In some embodiments of the present invention, the density of the innermost aluminum alloy is lower than that of the outermost aluminum alloy, or the density of the middle aluminum alloy is smaller than that of the outermost aluminum alloy but greater than that of the innermost aluminum alloy.

In some embodiments of the present invention, the densities of at least two layers of aluminum alloys decrease sequentially from outside to inside.

In some embodiments of the present invention, the concrete placing boom is made of aluminum alloy and integrally connected with the support.

In some embodiments of the present invention, the outermost layer of aluminum alloy contains wear resistance enhancing particles.

In some embodiments of the present invention, the wear resistance-enhancing particles are distributed in the outermost layer of aluminum alloy in such a manner that their sizes gradually increase radially outward.

In some embodiments of the present invention, the wear resistance enhancing particles are distributed in the outermost aluminum alloy in a denser manner on the outside than on the inside.

In some embodiments of the present invention, the size combination of wear resistance enhancing particles includes a first diameter ranging between 12-18 μm, a second diameter ranging between 24-36 μm and a second diameter ranging between 40-60 μm. Three diameters.

In some embodiments of the present invention, the first diameter is 15 μm, the second diameter is 30 μm, and the third diameter is 50 μm.

The invention provides a concrete pumping equipment, which includes a fixed concrete pump or a mobile concrete pump truck, a hose at the end of a concrete delivery pipe and the above-mentioned concrete distributing boom.

The present invention provides a method for manufacturing a bracket for a concrete placing boom, the bracket is used to support a hose at the end of a delivery pipe of a concrete pumping equipment, wherein the method includes the following steps:

Centrifugal casting of a tube blank, including preparing a multi-layer composite tube blank with at least two layers of alloys by centrifugal casting, the at least two layers of alloys include an outermost layer of aluminum alloy with high wear resistance and an innermost layer of aluminum alloy with high rigidity;

Transferring the tube blank, including transferring the tube blank from the station where the centrifugal casting is performed to the station where the rotary extrusion is performed;

extruding the bracket, including performing rotational extrusion of the tube stock to obtain the bracket; and

Continuously perform the steps of centrifugal casting the tube blank, transferring the tube blank and extruding the bracket in sequence.

In some embodiments of the present invention, the step of transferring the tube blank includes transferring the tube blank from the station for performing centrifugal casting to the station for performing rotary extrusion by moving the centrifugal casting mold, and in the station for performing centrifugal casting, the centrifugal casting The tube blank is centrifugally cast in the cavity of the mold, and the tube blank in the cavity of the centrifugal casting mold is rotated and extruded in the extrusion molding station.

In some embodiments of the present invention, the step of centrifugally casting the tube blank includes:

Abrasion-resistance-enhancing particles of different sizes are available;

Heating and melting the aluminum alloy substrate;

Stir the aluminum alloy matrix, add different sizes of wear-resistant enhancing particles in turn, the speed of stirring the aluminum alloy matrix when adding small-sized wear-resistant enhancing particles is lower than that of stirring the aluminum alloy matrix when adding large-sized wear-resistant enhancing particles rotational speed; and

The aluminum alloy matrix with wear-resistance-enhancing particles is poured into the cavity of a centrifugal casting device, and the outermost layer of aluminum alloy containing wear-resistance-enhancing particles is produced by centrifugal casting.

In some embodiments of the invention, the different sizes of the wear resistance enhancing particles include a first diameter between 12-18 μm, a second diameter between 24-36 μm and a third diameter between 40-60 μm.

In some embodiments of the present invention, the first diameter is 15 μm, the second diameter is 30 μm, and the third diameter is 50 μm.

In some embodiments of the present invention, in the centrifugal casting step, once the outermost aluminum alloy with high wear resistance is manufactured, the molten aluminum alloy is immediately poured into the cavity of the centrifugal casting device, and the A second layer of aluminum alloy is cast on the inner side of the outermost layer of high wear resistance aluminum alloy. Compared with the outermost layer of aluminum alloy, the second layer of aluminum alloy has higher rigidity or higher strength and toughness.

In some embodiments of the present invention, in the centrifugal casting step, once the second layer of aluminum alloy with higher strength and toughness is prepared, the molten high-rigidity alloy material is immediately poured into the cavity of the centrifugal casting device, through The centrifugal casting method casts the third layer of aluminum alloy on the inner side of the second layer of aluminum alloy with high strength and toughness. Compared with the outermost layer of aluminum alloy with high wear resistance and the second layer of aluminum alloy with high strength and toughness, the third layer of aluminum alloy Has higher rigidity.

In some embodiments of the present invention, in the radial direction of the tube blank, the density of each layer of aluminum alloy decreases sequentially from outside to inside.

The invention provides a kind of equipment for manufacturing concrete placing boom support, comprising:

Centrifugal casting apparatus, including centrifugal casting molds having cavities therein;

A rotary extrusion device for extruding the tube blank into a bracket, including a connected extrusion die and a bracket forming die; and

The centrifugal casting mold is movable so as to switch between the station for performing centrifugal casting and the station for performing rotary extrusion. In the case where the centrifugal casting mold is located at the station for performing centrifugal casting, the tube blank of at least two layers of alloy Formed in the cavity of the centrifugal casting mold by the centrifugal casting method; in the case where the centrifugal casting mold is located at the station performing rotary extrusion, the cavity of the centrifugal casting mold communicates with the extrusion die orifice, so that the mold of the centrifugal casting mold The tube blank in the cavity can be extruded through the extrusion die into the bracket forming die to form the bracket.

In some embodiments of the present invention, the equipment further includes a track, the track is located between the centrifugal casting device and the rotary extrusion device, and the centrifugal casting mold can move along the track between the station for performing centrifugal casting and the station for performing rotary extrusion switch between.

In some embodiments of the present invention, the rotary extrusion device includes a heating device for heating the rotary extrusion device.

In some embodiments of the present invention, the equipment further includes a controller, the controller is used to receive the working status information of the centrifugal casting device and the rotary extrusion device and send instructions instructing the centrifugal casting device and the rotary extrusion device to perform operations, and the controller is configured to perform at least one of the following actions;

Responsive to completion of the preparation of the tube stock of at least two layers of alloy, issuing an instruction to drive the centrifugal casting mold toward the station for performing rotary extrusion;

In response to the centrifugal casting mold arriving at the station for performing rotary extrusion, issuing an instruction instructing the rotary extrusion device to perform extrusion of the tube; and

In response to the completion of extruding the tube blank by the rotary extrusion device, an instruction is issued to drive the centrifugal casting mold to move toward the station for performing centrifugal casting.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 shows the schematic diagram of the concrete pumping equipment according to the embodiment of the present invention;

2 shows a partial schematic diagram of a concrete pumping device according to an embodiment of the present invention, wherein the hose 15 positioned at the end of the concrete delivery pipe 11 is supported on a bracket 17 provided on the concrete placing boom 12;

Figure 3 shows a schematic diagram of a bracket 17 according to an embodiment of the present invention;

Fig. 4 is a schematic cross-sectional view of an embodiment of the bracket 17 taken along A-A of Fig. 3;

FIG. 5 is a schematic cross-sectional view of another implementation of the bracket 17 taken along A-A of FIG. 3;

Fig. 6 is an enlarged view of area B in Fig. 4;

FIG. 7 is an apparatus for manufacturing a boom bracket 17 according to an embodiment of the present invention, wherein a rotary casting extrusion die 217 is in a centrifugal casting station; and

Fig. 8 is an apparatus for manufacturing the boom bracket 17 according to the embodiment of the present invention, wherein the rotary casting extrusion die 217 is in the rotary extrusion station.

Detailed ways

The technical solutions in the embodiments of the present invention will be described in detail below with reference to the drawings in the embodiments of the present invention.

The invention relates to a distributing boom for concrete pumping equipment. The concrete pumping equipment includes a fixed concrete pump and a movable concrete pump truck. As shown in Figures 1 and 2, the concrete pump truck 10 has a concrete distribution boom 12, a concrete delivery pipe 11 is carried by a bracket 17 on the concrete distribution boom 12, and the concrete delivery pipe 11 includes a hose 15 at the end of the delivery pipe. The bracket 17 is made of a multi-layer composite tube composed of at least two alloy layers.

In some embodiments of the present invention, Fig. 3 shows the bracket 17 of the concrete placing boom 12, the bracket 17 has an open receiving part 18, the shape of the open receiving part 18 is suitable for receiving the hose 15 therein, and ensures that the hose 15. When the concrete pump truck 10 is working, it is convenient and frequent to remove and reinstall it from the support 17. The shape of the open accommodating part 18 can be concave in any shape, such as C-shaped, rectangular, etc., and can also be other suitable shapes, as long as it is convenient. Take flexible pipe 15 and get final product.

The multilayer composite tube of the bracket 17 is made of at least two layers of aluminum alloy. Among the at least two layers of alloys, the outermost layer of aluminum alloy 171 has better wear resistance, and the innermost layer of aluminum alloy 173 has better rigidity. This improves the wear resistance and load-bearing performance of the bracket 17 . It reduces the wear and tear on the surface of the bracket 17 caused by frequent taking of the hose 15 at the end of the conveying pipe, and surface corrosion due to abrasion, thereby improving the service life of the bracket 17 and thus also improving the service life of the concrete placing boom 12 .

In some embodiments of the present invention, as shown in FIG. 4 , the multilayer composite tube of the bracket 17 is composed of two layers of aluminum alloy, and the two layers of alloy include the outermost layer of aluminum alloy 171 and the innermost layer of aluminum alloy 173 . Among the two layers, the outermost layer of aluminum alloy 171 has better wear resistance, and the innermost layer of aluminum alloy 173 has greater rigidity. This improves the wear resistance and load-bearing performance of the bracket 17 .

In some embodiments of the present invention, as shown in Figure 5, the multilayer composite tube of the bracket 17 is made of three layers of aluminum alloy, and the three layers of alloy layers include the outermost layer of aluminum alloy 171, the middle layer of alloy 172 and the innermost layer of aluminum alloy 173, the middle alloy 172 is located between the outermost alloy 171 and the innermost alloy 173. Among the three layers, the outermost layer of aluminum alloy 171 has better wear resistance, the middle layer of aluminum alloy 172 has better toughness and strength, and the innermost layer of aluminum alloy 173 has greater rigidity. This improves the wear resistance, strength and rigidity of the bracket 17 and is light in weight, improving its load-bearing performance.

In some embodiments of the present invention, the multi-layer composite tube of the bracket 17 can be made of more than three layers of alloy, and the difference from the two embodiments of Fig. 4 and Fig. 5 is that an additional middle layer of aluminum alloy is added, and the additional The aluminum alloy in the middle layer can play a role in improving properties such as strength, rigidity or toughness.

In some embodiments of the present invention, the density of at least two layers of aluminum alloys in the multilayer composite pipe decreases sequentially from outside to inside in the radial direction, so that compared with steel brackets and single aluminum alloy brackets, the durability of the brackets is ensured. In the case of good abrasiveness and load-bearing performance, the weight of the bracket is lighter.

In some embodiments of the present invention, as shown in FIG. 6, the outermost layer of aluminum alloy 171 contains wear resistance enhancing particles 174, and the wear resistance enhancing particles 174 gradually increase in size along the radial direction of the multilayer composite pipe. In the outermost layer of aluminum alloy 171, that is, in the outermost layer of aluminum alloy 171, the size of the wear resistance enhancing particles 174 closer to the inner side is smaller, and the size of the wear resistance enhancing particles 174 closer to the outer side is smaller. big. Arranging large-sized wear resistance enhancing particles near the outer side is beneficial to enhance the wear resistance of the bracket 17 .

In some embodiments of the invention, the combination of sizes of wear resistance enhancing particles 174 includes a first diameter in the range of 12-18 μm, a second diameter in the range of 24-36 μm, and a diameter in the range of 40-60 μm. third diameter. For example, the first diameter is 15 μm, the second diameter is 30 μm, and the third diameter is 50 μm. In this way, the wear resistance-enhancing particles 174 in the outermost aluminum alloy 171 are distributed in three sizes gradually increasing from the inside to the outside, which enhances the wear resistance of the outermost aluminum alloy 174 .

In some embodiments of the present invention, the outermost aluminum alloy 171 contains wear resistance enhancing particles 174 . In the outermost layer of aluminum alloy 171, the wear resistance enhancing particles 174 are distributed in the outermost layer of aluminum alloy 171 in a denser manner on the outside than on the inside, that is, the density of the wear resistance enhancing particles 174 on the outside area is greater than that on the inside area The density of the wear resistance enhancing particles 174 in the outer region is conducive to improving the wear resistance of the bracket 17, and the smaller density of the wear resistance enhancing particles 174 in the inner region means that the alloy has more matrix metal, This helps the metallurgical bonding between the outermost aluminum alloy 171 and the innermost aluminum alloy 173 or the middle layer alloy 172 . In some embodiments of the present invention, in the outermost aluminum alloy 171 , the sizes of the wear resistance enhancing particles 174 may be substantially consistent.

In some embodiments of the present invention, the multi-layer composite pipe of the bracket 17 and the concrete placing boom 12 are both made of aluminum alloy. The support can be integrally connected to the concrete distribution boom 12 by welding, so that a good bonding strength is formed between the support 17 and the concrete distribution boom 12, thereby improving the load-bearing performance and service life of the concrete distribution boom 12, which helps The concrete delivery pipe 11 is used to pump the concrete to a higher position, and there will be no problems of potential difference between different base metals, easy formation of electrochemical corrosion, and poor welding quality.

In some embodiments of the present invention, the aluminum alloy matrix of the outermost aluminum alloy 171 is ZL104 alloy, and the material components of the outermost aluminum alloy are: Al (89.90wt%), Si (9.24wt%), Mg (0.54wt%) wt%), Fe (0.22wt%), Ni (0.08wt%), Mg (0.007wt%), impurities (all the rest), the material of wear resistance enhancing particle 174 comprises carbide, nitride or oxide, carbide Including SiC, nitrides include TiN and Si3N4, oxides include Al2O3, the particle size combination and weight ratio of wear resistance enhancing particles 174 are as follows: diameter 15 μm (33.33wt%), diameter 30 μm (33.33wt%) and diameter 50 μm (33.33wt%) wt%). The material components of the innermost aluminum alloy 173 are: Cu (3.05wt%), Li (1.45wt%), Mg (0.50wt%), Ag (0.35wt%), Zn (0.25wt%), Zr (0.12 wt%), Fe (0.05 wt%), Ti (0.05 wt%), Al (the rest). The material components of the intermediate layer alloy 172 are: Al (92.25wt%), Cu (4.50wt%), Mg (0.35wt%), Ti (0.25wt%), Mn (0.82wt%), impurities (the rest). Compared with the steel bracket, the aluminum alloy bracket 17 reduces weight by at least 50%. Compared with the tailor-welded support of ordinary aluminum alloy bent pipes of the same size, the weight is reduced by at least 20%, the bearing capacity is improved by at least 50%, the surface wear resistance is improved by at least 30%, and the rigidity is increased by at least 30%.

As shown in Figures 1 and 2, the present invention also provides a concrete pumping device 10, the concrete pumping device 10 is a fixed concrete pump or a mobile concrete pump truck, and the concrete pumping device 10 includes a concrete distribution boom 12 and The hose 15 located at the end of the concrete delivery pipe 11 is supported on the bracket 17 of the concrete placing boom 12 .

The present invention provides a method for manufacturing the bracket 17 of the concrete placing boom 12, comprising:

Centrifugal casting of the billet 24 includes continuous casting of at least two layers of alloys sequentially by a centrifugal casting method to form a multi-layer composite billet 24. The at least two layers of alloys include the outermost aluminum alloy 171 with high wear resistance and the outermost layer with high rigidity. Inner aluminum alloy 173;

Transferring the tube blank 24, including after the centrifugal casting of the tube blank 24 is completed, transferring the tube blank 24 from the station performing centrifugal casting to the station performing rotary extrusion, so that the tube blank 24 is rotated and extruded to obtain a bracket 17;

Rotating and extruding the tube blank 24, including rotating and extruding the tube blank 24 to obtain the bracket 17;

The support 17 is obtained by continuously performing the steps of centrifugal casting of the tube blank, conveying the tube blank 24 and rotating the tube blank 24 in sequence. The above steps are performed continuously and without interruption, thus improving the processing efficiency and reducing the time between each step. heat transfer loss between them. Moreover, at least two layers of alloys are sequentially and continuously cast by a centrifugal casting method, so that the bonding strength between the at least two layers of alloys is good.

The present invention provides a device for manufacturing the bracket 17 of the concrete placing boom 12 , the device includes a centrifugal casting device 200 and a rotary extrusion device 20 .

As shown in Figure 7, the centrifugal casting device 200 includes a centrifugal casting mold 217 with a cavity in it, a casting end cover 214 detachably installed on one end of the centrifugal casting mold 217, installed on the casting end cover 214 and used to drive the centrifugal casting mold. The centrifugal driving device 215 that the casting mold 217 rotates, and the pouring end cover 212 that is detachably installed on the other end of the centrifugal casting mold 217 . The pouring end cap 212 has a sprue so that the molten alloy enters the cavity of the centrifugal casting mold 217 from the sprue.

The centrifugal casting mold 217 is movable so as to switch between a station for performing centrifugal casting and a station for performing rotary extrusion. When the centrifugal casting mold 217 is located at the station for performing centrifugal casting, the centrifugal casting mold 217 is communicated with the pouring port of the pouring end cap 21, so that the tube having at least two layers of alloy in the cavity of the centrifugal casting mold 217 is formed by the centrifugal casting method Blank 24.

As shown in Figure 8, the rotary extrusion device 20 includes an extrusion rod 1 with an extrusion pad 23, a perforating needle 22 positioned in the extrusion rod 1, a bracket forming die 27, and is positioned at one end of the bracket forming die 27 and formed with the bracket. The extruding die opening 25 that the cavity of mold 27 communicates, the forming mandrel 28 in the cavity of support forming die 27, the rotating ejector rod 210 that is positioned at support forming die 27 other ends and blocks cavity port.

After the centrifugal casting device 200 casts the tube blank 24, the casting end cap 214 and the pouring end cap 212 are separated from the centrifugal casting mold 217, and the centrifugal casting mold 217 is moved from the station for centrifugal casting shown in Figure 7 to the one shown in Figure 8 In the shown rotary extrusion station, the cavity of the centrifugal casting mold 217 communicates with the extrusion die opening 25, so that the tube blank 24 in the cavity of the centrifugal casting mold 217 can be extruded through the extrusion die opening 25 Enter the bracket molding die 27 to form the bracket 17.

In some embodiments of the present invention, the equipment for manufacturing the bracket 17 of the concrete placing boom 12 includes a track 218, the track 218 extends between the centrifugal casting device 200 and the rotary extrusion device 20, and the centrifugal casting mold 217 can move along the track 218 in Switch between a station performing centrifugal casting and a station performing rotary extrusion.

In some embodiments of the present invention, as shown in Figures 7 and 8, the equipment for manufacturing the bracket 17 of the concrete placing boom 12 includes a controller 30, and the controller 30 can be installed on the centrifugal casting device 217, and can also be installed on other parts of the equipment. part or location. The controller 30 is in signal communication with the centrifugal casting device 200 and the rotary extrusion device 20, so as to receive the working status information of the centrifugal casting device 200 and the rotary extrusion device 20, and send the centrifugal casting device 200 and the rotary extrusion device 20 Instructions for performing operations, these instructions can be directly sent to the centrifugal casting device 200 and the rotary extrusion device 20, and can also be sent to other devices to perform operations on the centrifugal casting device 200 and the rotary extrusion device 20 to perform at least one of the following operations:

In response to the centrifugal casting device 200 completing the preparation of the tube blank 24, the controller 30 immediately sends an instruction to drive the centrifugal casting device 217 to move from the station performing centrifugal casting toward the station performing rotary extrusion;

In response to the centrifugal casting device 217 arriving at the station for performing rotary extrusion, the controller 30 issues an instruction instructing the rotary extrusion device 20 to perform extrusion of the tube blank 24; and

In response to the rotary extrusion device 20 finishing extruding the tube blank 24, the controller 30 issues an instruction to drive the centrifugal casting device 217 toward a station for performing centrifugal casting.

Through the controller 30, the process from centrifugal casting to extrusion molding can be performed continuously and without interruption, which improves the overall processing efficiency.

In some embodiments of the present invention, the multi-layer composite tube blank 24 having at least two layers of alloy is manufactured by the centrifugal casting device 200, including the following steps:

First, the outermost layer of aluminum alloy 171 is prepared, including stirring the aluminum alloy matrix, and sequentially adding wear-resistant enhancing particles 174 of different sizes and combinations. The size of the wear resistance enhancing particles is 174 when the rotational speed of the aluminum alloy matrix is stirred. Taking the wear resistance enhancing particles 174 combined in three sizes as an example, after the base alloy is melted in the furnace, the base alloy is stirred at the first rotational speed and the wear resistance enhancing grains 174 of the first diameter are added, and then stirred at the second rotational speed Add the wear resistance enhancing particles 174 of the second diameter to the base alloy, then stir the base alloy at the third rotational speed and add the wear resistance enhancing particles 174 of the third diameter, the first diameter<the second diameter<the third diameter, the first The rotational speed<the second rotational speed<the third rotational speed. The range of the first diameter is between 12-18 μm, the range of the second diameter is between 24-36 μm, and the range of the third diameter is between 40-60 μm. Optionally, the first diameter is 15 μm, the second diameter is 30 μm, and the third diameter is 50 μm.

The aluminum alloy matrix with the wear resistance enhancing particles 174 is poured into the cavity of the centrifugal casting device 200, and the outermost aluminum alloy 171 containing the wear resistance enhancing particles 174 is manufactured by centrifugal casting.

Once the preparation of the outermost aluminum alloy 171 is completed, the molten alloy material is immediately poured into the cavity of the centrifugal casting device 200, and the second layer is cast on the inner side of the outermost aluminum alloy 171 with high wear resistance by centrifugal casting. Aluminum alloy, the second layer of aluminum alloy has high rigidity or high strength and toughness. Since the wear resistance enhancing particles 174 are distributed in the outermost aluminum alloy 171 in a denser manner on the outside than the inside, when the outermost layer containing less wear resistance enhancing particles 174 and more aluminum alloy matrix components When the inner side of the aluminum alloy 171 is combined with the second layer of aluminum alloy, the composition of the inner side of the outermost layer of aluminum alloy 171 is closer to that of the second layer of aluminum alloy, which improves the bonding strength between the multilayer alloys. When the second layer of aluminum alloy has high rigidity, the second layer of aluminum alloy can be used as the innermost layer of aluminum alloy 173, which helps to reduce the amount of deformation of the bracket 17 when it is under load, and reduces the vibration of the hose 15.

Once the preparation of the second layer of aluminum alloy 172 with high strength and toughness is completed, the molten high-rigidity alloy material is immediately poured into the cavity of the centrifugal casting device 200, and the second layer of aluminum alloy 172 with high strength and toughness is formed by centrifugal casting. The inner side casts a high-rigidity third layer of aluminum alloy 173. The second layer of aluminum alloy 172 with high strength and toughness is used as the middle layer alloy, which improves the overall strength and toughness of the multi-layer composite pipe, thereby improving the bearing capacity of the multi-layer composite pipe. The third layer of high-rigidity aluminum alloy 173 can be used as The innermost layer of aluminum alloy helps to reduce the amount of deformation of the bracket 17 when it is under load, and reduces the vibration of the hose 15 .

In the centrifugal casting multi-layer alloy, since it is ensured that the preparation of the previous layer of alloy is completed, the molten alloy material is immediately poured into the inner side of the previous layer of alloy to centrifugally cast the next layer of alloy, so as to avoid the preparation of the previous layer of alloy and the The heat loss between the alloys in the latter layer improves the heat transfer efficiency between the various processes, and since the centrifugal casting of the alloy in the latter layer follows the centrifugal casting of the alloy in the previous layer, the bonding strength between the multilayer alloys is improved.

In some embodiments of the present invention, the operation steps of the rotary extrusion device 20 are described. As shown in FIGS. The casting mold 217 is moved into the rotary extrusion device 20 and put in place, the extrusion rod 21, the piercing needle 22 and the extrusion pad 23 are arranged in place on one side of the centrifugal casting mold 217, and the extrusion die opening is placed on the other side of the centrifugal casting mold 217. 25. The heating device 26, the bracket molding die 27, the molding mandrel 28 and the rotating ejector rod 210 are arranged in place, wherein the perforating needle 22 is moved to abut against the molding mandrel 28, and the two halves of the bracket molding die 27 are Closing, the heating device 26 is installed on the periphery of the bracket molding die 27 . Heating device 26 heats centrifugal casting mold 217, extrusion die opening 25, support molding die 27, extrusion rod 21, rotating ejector rod 210 and extrusion pad 23 start to work, and rotating ejector rod 210 is maintaining pressure (pressure range 5 -50MPa, such as 15MPa), drive the extrusion die opening 25 and the bracket forming die 27 to rotate at a constant speed (rotating speed range 1-30RPM, such as 6RPM), forming the rotary extrusion of the composite tube blank 24; then extruding the composite tube blank 24 enters the bracket molding die 7, and forms a tube blank 28 around the molding mandrel 28 in the cavity. The extrusion rod 21 returns after reaching the predetermined stroke, and the heating system is turned off; the bracket forming mold 27 is opened, and after the aging treatment is performed on the formed bracket, the formed bracket is cut to obtain multiple brackets 17 . By rotating and extruding the tube blank 24 under the condition of heating, a good metallurgical bond is realized between the multi-layer alloys under the hot-pressing rotation coupling effect.

Since the centrifugal casting mold 217 is movable, it can be switched between the station for performing centrifugal casting in the centrifugal casting device 200 and the station for performing rotary extrusion in the rotary extrusion device 20, so that the centrifugal casting device 200 The operations with the rotary extrusion device 20 are performed continuously without interruption, and the centrifugal casting equipment 200 and the rotary extrusion device 20 share the centrifugal casting mold 217, which improves the continuity and work efficiency between the centrifugal casting and rotary extrusion processes.

The above descriptions are only exemplary embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (23)

1. A concrete distribution boom (12), the concrete distribution boom (12) is provided with a support (17), and the support (17) is configured to support a flexible pipe (15) at the end of a concrete delivery pipe (11) ), the bracket (17) is formed by a multi-layer composite tube made of at least two layers of aluminum alloys stacked; the at least two layers of aluminum alloys include the outermost layer of aluminum alloy (171) and the innermost layer of aluminum alloy (173 ), among the at least two layers of aluminum alloys, the outermost layer of aluminum alloy (171) has better wear resistance, and the innermost layer of aluminum alloy (173) has greater rigidity. 2. The concrete placing boom (12) according to claim 1, wherein the at least two layers of aluminum alloys further comprise an intermediate layer between the innermost layer of aluminum alloy (173) and the outermost layer of aluminum alloy (171). The layer aluminum alloy (172), compared with the innermost layer aluminum alloy (173) and the outermost layer aluminum alloy (171), the strength and toughness of the middle layer aluminum alloy (172) are greater. 3. The concrete placing boom (12) according to claim 1 or 2, wherein the innermost layer aluminum alloy (173) is smaller in density than the outermost layer aluminum alloy (171), or the middle layer aluminum alloy Alloy (172) is less dense than said outermost aluminum alloy (171) but greater than said innermost aluminum alloy (173) in density. 4. The concrete placing boom (12) according to claim 2 or 3, wherein the density of the at least two layers of aluminum alloys decreases sequentially from outside to inside. 5. The concrete placing boom according to claim 1, wherein the concrete placing boom (12) is made of aluminum alloy and integrally connected with the bracket (17). 6. The concrete placing boom (12) according to any one of claims 1-5, wherein the outermost aluminum alloy (171) contains wear resistance enhancing particles (174). 7. The concrete placing boom (12) according to claim 6, wherein the wear resistance enhancing particles (174) are distributed on the outermost aluminum layer in such a manner that the size gradually increases radially outward alloy (171). 8. The concrete placing boom (12) according to claim 6 or 7, wherein the wear resistance enhancing particles (174) are distributed on the outermost aluminum alloy (171) in a manner denser on the outside than on the inside )middle. 9. The concrete placing boom (12) according to any one of claims 6-8, wherein the combination of sizes of the abrasion resistance enhancing particles (174) comprises a first diameter in the range of 12-18 μm, the range The second diameter is between 24-36 μm and the third diameter is in the range between 40-60 μm. 10. The concrete placing boom (12) according to claim 9, wherein the first diameter is 15 μm, the second diameter is 30 μm, and the third diameter is 50 μm. 11. A concrete pumping device (10), wherein the concrete pumping device (10) is a fixed concrete pump or a mobile concrete pump truck, comprising a flexible pipe (15) at the end of the concrete delivery pipe (11) ) and the concrete placing boom (12) as described in any one of claims 1-10. 12. A method of manufacturing a bracket (17) for a concrete placing boom, said bracket (17) being used to support a hose (15) at the end of a delivery pipe (11) of a concrete pumping device (10), wherein said The method includes the following steps: Centrifugal casting of a tube blank, comprising preparing a multi-layer composite tube blank (24) having at least two layers of alloy by centrifugal casting, the at least two layers of alloy including an outermost aluminum alloy (171) with high wear resistance and a high Rigid innermost aluminum alloy (173); transferring the tube blank, including transferring the tube blank (24) from a station performing centrifugal casting to a station performing rotary extrusion; extruding a bracket comprising performing rotary extrusion on said tube blank (24) to obtain said bracket (17); and The steps of centrifugally casting the tube blank, conveying the tube blank and extruding the bracket are sequentially performed continuously. 13. The method according to claim 12, wherein the step of transferring the billet comprises transferring the billet (24) from a station performing centrifugal casting to a station performing rotary extrusion by moving a centrifugal casting mold (217) In the station for performing centrifugal casting, the tube blank (24) is centrifugally cast in the cavity of the centrifugal casting mold (217), and in the station for performing extrusion molding, the centrifugal casting The tube blank (24) in the cavity of the die (217) is subjected to rotary extrusion. 14. The method according to claim 12 or 13, wherein the step of centrifugally casting the tube blank comprises: providing wear resistance enhancing particles (174) of different sizes; Heating and melting the aluminum alloy substrate; Stirring the aluminum alloy matrix, adding different sizes of wear-resistant enhancing particles (174) in sequence, the speed of stirring the aluminum alloy matrix when adding small-sized wear-resistant enhancing particles (174) is less than that of adding large-sized wear-resistant enhancing particles ( 174) the rotating speed of stirring aluminum alloy substrate; And The aluminum alloy matrix with the wear resistance enhancing particles (174) is poured into the mold cavity of the centrifugal casting device, and the outermost aluminum alloy (171) containing the wear resistance enhancing particles (174) is produced by centrifugal casting. 15. The method according to claim 14, wherein the different sizes of the abrasion resistance enhancing particles (174) include a first diameter between 12-18 μm, a second diameter between 24-36 μm, and a diameter between 40 A third diameter between -60 μm. 16. The method of claim 15, wherein the first diameter is 15 μm, the second diameter is 30 μm, and the third diameter is 50 μm. 17. The method according to any one of claims 12-16, wherein in the centrifugal casting step, after manufacturing the outermost aluminum alloy (171) with high wear resistance, the molten aluminum alloy is poured into the cavity of the centrifugal casting device, and the second layer of aluminum alloy (172; 173) is cast on the inner side of the outermost layer of aluminum alloy (171) with high wear resistance by centrifugal casting method. Compared with the outermost layer of aluminum alloy (171 ), the second layer of aluminum alloy (172; 173) has higher rigidity or has higher strength and toughness. 18. The method according to claim 17, wherein in the centrifugal casting step, after the second layer of aluminum alloy (172) with higher strength and toughness is prepared, the molten high-rigidity alloy material is poured into the centrifuge In the cavity of the casting device, a third layer of aluminum alloy (173) is cast on the inner side of the second layer of high-strength and toughness aluminum alloy (172) by a centrifugal casting method. Compared with the outermost layer of aluminum alloy (172) with high wear resistance ( 171) and a second layer of aluminum alloy (172) with high strength and toughness, and the third layer of aluminum alloy (173) has higher rigidity. 19. The method according to claim 17 or 18, wherein in the radial direction of the tube blank (24), the density of each layer of aluminum alloy decreases sequentially from outside to inside. 20. An apparatus for manufacturing a concrete placing boom support (17), comprising: Centrifugal casting apparatus (200), comprising a centrifugal casting mold (217) having a cavity therein; A rotary extrusion device (20), used to extrude the tube blank (24) to form the bracket (17), comprising a connected extrusion die (25) and a bracket forming die (27); and Wherein the centrifugal casting mold (217) is movable so as to switch between a station performing centrifugal casting and a station performing rotary extrusion, where the centrifugal casting mold (217) is located at a station performing centrifugal casting In the case of, at least two-layer alloy tube blank (24) is centrifugally cast in the cavity of said centrifugal casting mold (217); Next, the cavity of the centrifugal casting mold (217) communicates with the extrusion die opening (25), so that the tube blank (24) in the cavity of the centrifugal casting mold (217) is rotated and extruded Enter the bracket forming die (27) through the extrusion die opening (25) to form the bracket (17). 21. The apparatus according to claim 20, further comprising a rail (218) positioned between the centrifugal casting device (200) and the rotary extrusion device (20), the centrifugal casting mold ( 217) Being able to move along the track (218) to switch between the station performing centrifugal casting and the station performing rotary extrusion. 22. Apparatus according to claim 20 or 21, wherein the rotary extrusion device (20) comprises heating means (26) for heating the rotary extrusion device (20). 23. The apparatus according to any one of claims 20-22, further comprising a controller (30) for receiving the centrifugal casting device (200) and the rotary extrusion device (20 ) working status information and sending instructions indicating that the centrifugal casting device (200) and the rotary extrusion device (20) perform operations, the controller (30) is configured to perform at least one of the following operations; In response to completing the preparation of the at least two-layer alloy tube blank (24), issuing an instruction to drive the centrifugal casting mold (217) toward the station for performing rotary extrusion; In response to the centrifugal casting mold (217) arriving at the station for performing rotary extrusion, issuing an instruction instructing the rotary extrusion device (20) to perform extrusion of the tube blank (24); and In response to the completion of extruding the tube blank (24) by the rotary extrusion device (20), an instruction is issued to drive the centrifugal casting mold (217) to move toward the station for performing centrifugal casting.

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