WO2022228416A1

WO2022228416A1 - Arm and production method for arm

Info

Publication number: WO2022228416A1
Application number: PCT/CN2022/089192
Authority: WO
Inventors: 王兵; 程少科; 吴福晓
Original assignee: 三一重机有限公司
Priority date: 2021-04-30
Filing date: 2022-04-26
Publication date: 2022-11-03
Also published as: CN113123399A

Abstract

The present application relates to the technical field of engineering machinery, and in particular to an arm and a production method for the arm. The arm comprises a first connecting member, a main pipe member, and a second connecting member which are sequentially connected; the material of the first connecting member and the second connecting member comprises metal; connecting ends are formed at the two ends of the main pipe member, and the material of the main pipe member comprises a fiber reinforced composite material; and the portion, located between the two connecting ends, of the main pipe member is made of the fiber reinforced composite material. According to the present application, the connecting ends are formed at the two ends of the main pipe member, the material of the main pipe member comprises the fiber reinforced composite material, and the portion, located between the two connecting ends, of the main pipe member is made of the fiber reinforced composite material, so that the arm is light in weight and high in strength, and the problem that the structural strength is inconsistent due to the situation that the main body of the arm uses a welding process is solved; and the material of the first connecting member and the second connecting member which are connected to the main pipe member comprises a metal material, so that the wear resistance and strength of the connection positions can be ensured, and the service life of the arm is prolonged.

Description

Stick and manufacturing method of stick

This application claims the priority of the Chinese patent application with the application number 202110487936.1 and the invention titled "A stick and its production method" filed with the China Patent Office on April 30, 2021, the entire contents of which are incorporated herein by reference middle.

technical field

The present application relates to the technical field of construction machinery, in particular to a stick and a production method of the stick.

Background technique

At present, the sticks of excavators are mostly welded by several plates, and their cross-sections are usually rectangular. As shown in Figure 1, the sticks 1 have the following disadvantages:

1. The stick is made of steel as a whole, the structure is cumbersome, it is not resistant to corrosion, and it needs to consume a large amount of hydraulic power during the working process;

2. In the manufacturing process of the stick, the welding process is used for welding, and the consistency and quality of the welding seam are difficult to detect, and defects such as false welding and undercut are easy to exist, and the smoke and dust generated during the welding process are easy to pollute the environment and endanger health;

3. The structural strength is poor in designability, and the cross-sectional shape is single, so it is difficult to optimize the design according to the strength requirements;

4. Under the action of impact load, the weld is easy to fail.

SUMMARY OF THE INVENTION

The main purpose of the present application is to provide a stick and a production method of the stick, so as to solve the problems in the prior art that the stick is made of steel as a whole, resulting in a bulky structure, and the main body of the stick adopts a welding process that leads to inconsistency in structural strength.

In order to achieve the above purpose, the present application provides an arm, comprising a first connecting piece, a main connecting piece and a second connecting piece connected in sequence, the materials of the first connecting piece and the second connecting piece include metal, and both ends of the main connecting piece The connection end is formed and the material thereof includes fiber reinforced composite material, and the material of the part of the main pipe located between the two connection ends is fiber reinforced composite material.

Optionally, the fiber reinforced composite material is a carbon fiber reinforced composite material or a glass fiber reinforced composite material or an aramid fiber reinforced composite material.

Optionally, the main pipe includes straight pipe sections and wedge-shaped pipe sections.

Optionally, at least one pipe wall of the straight pipe section and the pipe wall of the corresponding wedge-shaped pipe section are connected by an arc section.

Optionally, the wedge-shaped pipe section includes two first pipe walls and two second pipe walls that are arranged opposite to each other, and the first pipe walls are in the shape of a right-angled trapezoid.

Optionally, the connecting end includes several fiber-reinforced composite layers and several metal sheets, and a metal sheet is provided between two adjacent layers of the several fiber-reinforced composite layers.

Optionally, a plurality of through holes are formed on the metal sheet to form a metal mesh curtain.

Optionally, the first connecting element and the main pipe element and the second connecting element and the main pipe element are connected by bonding and/or fasteners.

The present application also provides a production method for an arm, comprising the following steps: disposing the fiber-reinforced composite material on a mandrel; heating and curing the fiber-reinforced composite material disposed on the mandrel to form a main pipe; The piece is connected with the first connecting piece and the second connecting piece which are made of metal to form the stick.

Optionally, in the step of arranging the fiber-reinforced composite material on the mandrel, the fibers soaked in the matrix material are wound on the mandrel, and the two ends of the mandrel have connecting shafts, and the fibers are wound in a relationship with the axis of the connecting shaft. The included angle is the winding angle, and the winding angle is in the range of 15° to 70°, or, the fiber cloth coated with the matrix material is laid on the mandrel.

Optionally, in the step of disposing the fiber-reinforced composite material on the mandrel, the thickness of the fiber-reinforced composite material disposed on the mandrel is in the range of 5 mm˜50 mm.

Optionally, in the step of disposing the fiber-reinforced composite material on the mandrel, the thickness of the fiber-reinforced composite material disposed on different cross-sections of the mandrel is different.

The technical solution of the present application has the following advantages: the two ends of the main pipe form connecting ends and the material includes fiber reinforced composite material, the material of the part of the main pipe between the two connecting ends is fiber reinforced composite material, and the fiber density is about 2.5～2.7g/cm ³ , which is only 1/3 of the density of steel, but the unidirectional tensile strength of the fiber is as high as 1000～2000MPa, which is much higher than the strength of traditional steel, making the stick light in weight and high in strength. The whole stick is made of steel welded, resulting in a bulky structure, and the welding process of the stick body leads to inconsistency in structural strength; The first connecting piece and the second connecting piece are used to connect with other components, which can ensure the wear resistance and strength of the joint and prolong the service life of the stick.

Description of drawings

In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the specific embodiments or the prior art will be briefly introduced below. The drawings are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

Fig. 1 shows the perspective view of the stick in the prior art;

Fig. 2 shows the perspective view of the stick provided by the present application;

FIG. 3 shows a schematic perspective view of the first connecting piece of the stick of FIG. 2;

Fig. 4 shows a perspective view of the second connecting rod of the stick of Fig. 2;

Figure 5 shows a schematic view of one end of the main pipe of the stick of Figure 2;

Figure 6 shows a partial schematic view of the metal mesh curtain of the main pipe of Figure 5;

FIG. 7 shows a schematic perspective view of a mandrel used in the production method of the stick provided by the present application.

Description of reference numbers:

1. Stick; 10. The first connecting piece; 11. The first threaded hole; 20. The main pipe; 21. The straight pipe section; 22. The wedge-shaped pipe section; Arc segment; 24, fiber reinforced composite layer; 25, metal mesh curtain; 30, second connecting piece; 31, second threaded hole; 40, fastener; 60, mandrel; 61, connecting shaft.

Detailed ways

The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limitations on this application. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood in specific situations.

In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict with each other.

As shown in FIG. 2 , the stick of this embodiment includes a first connector 10 , a main connector 20 and a second connector 30 connected in sequence. The first connector 10 and the second connector 30 are made of metal, and the main connector is made of metal. Both ends of the 20 form connecting ends and the material thereof includes fiber reinforced composite material, and the part of the main pipe 20 located between the two connecting ends is made of fiber reinforced composite material.

Applying the stick of this embodiment, the two ends of the main pipe 20 form connecting ends and the material includes fiber reinforced composite material, the part of the main pipe 20 between the two connecting ends is made of fiber reinforced composite material, and the fiber density is about It is 2.5～2.7g/cm ³ , which is only 1/3 of the density of steel, but the unidirectional tensile strength of the fiber is as high as 1000～2000MPa, which is much higher than the strength of traditional steel, making the stick light in weight and high in strength. It solves the problem that the whole stick is welded by steel, which causes the structure to be heavy and the main body of the stick adopts the welding process to cause the inconsistency of the structural strength; The first connecting piece 10 and the second connecting piece 30 are used to connect with other components, which can ensure the wear resistance and strength of the joint and prolong the service life of the stick.

In this embodiment, the fiber reinforced composite material is a carbon fiber reinforced composite material, a glass fiber reinforced composite material, an aramid fiber reinforced composite material, or the like. Fiber-reinforced composite materials include matrix materials and fibers, the fibers are carbon fibers, glass fibers or aramid fibers, etc., and the matrix materials are resins and the like. Optionally, the resin is epoxy resin, phenolic resin or unsaturated resin or the like.

In this embodiment, the main pipe 20 includes a straight pipe section 21 and a wedge-shaped pipe section 22. The arrangement of the wedge-shaped pipe section 22 makes the arm stronger, has a longer service life, and saves replacement costs. Optionally, the cross-sectional shapes of the straight pipe section 21 and the wedge-shaped pipe section 22 are both rectangular. Of course, the cross-sectional shapes of the straight pipe section 21 and the wedge-shaped pipe section 22 may also be polygons with more than 4 sides.

In this embodiment, a pipe wall of the straight pipe section 21 and the pipe wall of the corresponding wedge-shaped pipe section 22 are connected by the arc section 23, that is, the straight pipe section 21 and the wedge-shaped pipe section 22 transition through the arc section 23, which is convenient for processing and reduces the manufacturing cost . As an alternative embodiment, the two pipe walls, three pipe walls or four pipe walls of the straight pipe section 21 are connected with the pipe walls of the corresponding wedge-shaped pipe section 22 through the arc section 23 .

In this embodiment, the wedge-shaped pipe section 22 includes two first pipe walls 221 and two second pipe walls 222 arranged oppositely, the first pipe wall 221 is a right-angled trapezoid, the wedge-shaped pipe section 22 has a simple structure, is convenient to manufacture, and reduces the cost. The second pipe wall 222 is rectangular or trapezoidal.

In this embodiment, as shown in FIG. 5 and FIG. 6 , the connecting end includes several fiber-reinforced composite layers 24 and several metal sheets, and metal sheets are provided between any or some adjacent two layers of the several fiber-reinforced composite layers 24 . piece. The arrangement of the metal sheet can enhance the strength of the end of the main pipe, thereby improving the connection strength. Optionally, several through holes are formed on the metal sheet to form the metal mesh curtain 25 . Of course, through holes may not be provided on the metal sheet.

In this embodiment, the first connector 10 and the main tube 20 and the second connector 30 and the main tube 20 are connected by bonding and fasteners 40. First, the first connector 10 and the second connector 30 are connected to the main tube. The first connector 10, the second connector 30 and the main tube 20 are double-fixed to strengthen the first connector 10, the second connector 30 and the main tube 20 connection strength. Of course, the first connecting element 10 and the main pipe element 20 and the second connecting element 30 and the main pipe element 20 may also be connected only by bonding or fasteners 40 .

Optionally, one end of the first connector 10 is provided with a first threaded hole 11 threadedly connected with the fastener, and one end of the main pipe 20 is provided with a first through hole for the fastener to pass through. It is threaded through the first through hole and connected to the first threaded hole 11 . One end of the second connecting piece 30 is provided with a second threaded hole 31 for threaded connection with the fastener, and the other end of the main pipe piece 20 is provided with a second through hole for the fastener to pass through. The two through holes are threadedly connected to the second threaded hole 31 . The first connector 10 and the second connector 30 are respectively connected with the main tube 20 by 20 fasteners, and the fasteners are bolts. Of course, the number of fasteners is not limited to this, and the number of fasteners can be selected according to specific conditions.

In this embodiment, as shown in FIG. 3 and FIG. 4 , the first connecting piece 10 and the second connecting piece 30 are in the form of welding pieces, which can ensure the wear resistance of the end of the stick. Optionally, both the first connecting member 10 and the second connecting member 30 are provided with hinge holes.

In this embodiment, the stick is a very important part of the excavator. The excavator includes a working device, a power device, a traveling mechanism, etc., and the working device includes a stick, a bucket, etc., and other components of the excavator except the stick are all The structure in the prior art may be adopted, and details are not repeated here.

As an alternative embodiment, the materials of the first connector and the second connector include metal and fiber reinforced composite materials, that is, the materials of the first connector and the second connector are metal and non-metal composite materials, for example, in thin A fiber cloth coated with epoxy resin is laid on the metal bracket to form the first connecting piece or the second connecting piece, wherein the fiber cloth is formed by weaving fibers.

As an alternative embodiment, metal screws are pre-embedded on the end surface of the main pipe 20, the ends of the first connecting piece and the second connecting piece are provided with flanges, and the flanges are provided with through holes for the metal screws to pass through. , after the metal screw goes through the through hole, screw the nut on the screw.

The present application also provides a method for producing a stick, comprising the following steps:

The fiber-reinforced composite material is arranged on the mandrel 60 (as shown in FIG. 7 );

heating and curing the fiber reinforced composite material arranged on the mandrel 60 to form the main pipe 20;

The main pipe 20 is connected with the first connecting piece 10 and the second connecting piece 30 made of metal to form a stick.

The main pipe 20 of the stick is made of fiber-reinforced composite material, the density of the fiber is about 2.5-2.7g/cm ³ , which is only 1/3 of the density of the steel, but the unidirectional tensile strength of the fiber is as high as 1000-2000MPa, The strength of the stick is much higher than that of traditional steel, which makes the stick light in weight and high in strength, which solves the problem of the bulky structure of the stick made by welding steel as a whole and the inconsistency of the structural strength caused by the welding process of the stick body. The connected first connector 10 and the second connector 30 are made of metal materials, and the first connector 10 and the second connector 30 are used to connect with other components, which can ensure the wear resistance and strength of the connection, and prolong the life of the stick. service life.

In this embodiment, in the step of disposing the fiber-reinforced composite material on the mandrel 60, the fibers soaked in the matrix material are wound on the mandrel 60, and the two ends of the mandrel 60 have connecting shafts 61, and the fibers are wound with The included angle between the axes of the connecting shaft 61 is the winding angle, and the winding angle is in the range of 15°˜70°. Optionally, when the matrix material is epoxy resin and the fibers are glass fibers, carbon fibers, or aramid fibers, the glass fibers, carbon fibers, or aramid fibers pre-impregnated with epoxy resin are wound on the mandrel 60 . Specifically, the winding angles are 15°, 30°, 45°, 60° and 75°. As an alternative embodiment, a fiber cloth coated with matrix material is laid on the mandrel 60 .

In this embodiment, the thickness of the fiber-reinforced composite material disposed on the mandrel 60 is in the range of 5 mm to 50 mm, which can satisfy the structural strength of the arm. When the fibers soaked in the matrix material are wound on the mandrel 60, the thickness of the fiber-reinforced composite material disposed on the mandrel 60 refers to the thickness of the fibers soaked in the matrix material wound on the mandrel 60, which may be referred to as winding. thickness. Optionally, the thickness of the fiber reinforced composite material arranged on the mandrel 60 is in the range of 5mm to 20mm, and the winding angle, local cross-sectional shape, winding thickness, etc. of the fibers can be flexibly changed according to the strength requirements, and the structural strength can be designed. .

In this embodiment, according to the strength requirements of the stick, the thicknesses of the fiber-reinforced composite materials provided on different cross-sections of the mandrel 60 are different. The thicknesses at different cross-sections of the main pipe are different, and the thicknesses at different cross-sections of the main pipe can be flexibly changed according to the strength requirements of the stick.

After the step of heating and curing the fiber-reinforced composite material disposed on the mandrel 60 , the method further includes: pulling out the mandrel 60 from the main pipe 20 .

In this embodiment, after winding one or more layers of fibers pre-impregnated with epoxy resin on the mandrel 60, the metal mesh curtain 25 is placed on one end of the fiber-reinforced composite layer, and the pre-impregnated fiber is continued to be wound. When the fiber of epoxy resin is wound to the other end of the fiber-reinforced composite layer, the metal mesh curtain 25 is placed on the other end of the fiber-reinforced composite layer, and then the fiber is continued to be wound. Adding a metal mesh curtain 25 to the end of the main pipe 20 can strengthen the strength of the end of the main pipe.

In this embodiment, the mandrel 60 includes a mandrel body and a connecting shaft 61 disposed on both end surfaces of the mandrel body, and the axes of the two connecting shafts coincide. According to different strength requirements, choose the corresponding winding angle, winding thickness and the shape of the mandrel to meet the strength requirements of different products and different parts.

In this embodiment, in the step of connecting the main pipe 20 with the first connecting element 10 and the second connecting element 30 made of metal, the first connecting element 10 and the second connecting element 30 are respectively inserted into the main pipe element 20 . At both ends, the fasteners are passed through the through holes on the main pipe fitting 20 to be threadedly connected to the threaded holes of the first connecting piece 10 and the second connecting piece 30 . As an alternative embodiment, when metal screws are pre-embedded on the end surface of the main pipe 20, the ends of the first connecting piece and the second connecting piece are provided with flanges, and the flanges are provided with through holes for the metal screws to pass through. In the step of winding the fibers impregnated with the matrix material on the mandrel 60, after winding one or more layers of fibers pre-impregnated with epoxy resin on the mandrel 60, several metal screws are placed on the fiber reinforced composite the two ends of the layer, and then continue to wind the fiber pre-impregnated with epoxy resin, and then pre-embed the metal screw in the main pipe fitting 20; In the connecting step, several metal threaded rods embedded on both ends of the main pipe 20 are respectively passed through the flanges of the first connecting piece 10 and the second connecting piece 30, and then the nuts are screwed on the metal threaded rods.

From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

The main pipe in the middle of the stick is made of fiber reinforced composite material, which is light in weight and high in strength; the main pipe is hollow and does not need to be filled with foam; the first and second connectors at both ends of the stick are made of metal materials or metal and non-metallic materials. Metal composite material; a metal mesh curtain is added at the end between the fiber reinforced composite layers to increase the strength; the main pipe and the first connecting piece and the second connecting piece are double connected by bonding and bolts to enhance the connection strength. The stick of the above structure can realize the light weight of the product, greatly reduce the welding process, and then reduce the smoke and dust generated during the welding process. Impact resistant stick.

Obviously, the above-mentioned embodiments are only examples for clear description, and are not intended to limit the implementation manner. For those of ordinary skill in the art, changes or modifications in other different forms can also be made on the basis of the above description. There is no need and cannot be exhaustive of all implementations here. However, the obvious changes or changes derived from this are still within the protection scope of the present application.

Claims

An arm, characterized in that it comprises a first connecting piece (10), a main piece (20) and a second connecting piece (30) connected in sequence, the first connecting piece (10) and the second connecting piece The material of the fitting (30) includes metal, the two ends of the main pipe (20) form connecting ends and the material thereof comprises fiber-reinforced composite material, and the part of the main pipe (20) located between the two connecting ends is formed. The material is fiber reinforced composite material.
The stick of claim 1, wherein the fiber reinforced composite material is a carbon fiber reinforced composite material, a glass fiber reinforced composite material, or an aramid fiber reinforced composite material.
The stick according to claim 1, characterized in that, the main pipe (20) comprises a straight pipe section (21) and a wedge-shaped pipe section (22).
The stick according to claim 3, characterized in that, at least one pipe wall of the straight pipe section (21) is connected with the pipe wall of the corresponding wedge-shaped pipe section (22) through an arc section (23).
The stick according to claim 4, characterized in that, the wedge-shaped pipe section (22) comprises two first pipe walls (221) and two second pipe walls (222) arranged oppositely, the first pipe wall (222) The wall (221) is in the shape of a right-angled trapezoid.
The stick according to claim 1, characterized in that the connecting end comprises a plurality of fiber-reinforced composite layers (24) and a plurality of metal sheets, and one of the adjacent two layers of the plurality of the fiber-reinforced composite layers (24) There are metal sheets in the room.
The stick according to claim 6, wherein a plurality of through holes are formed on the metal sheet to form a metal mesh curtain (25).
The stick according to claim 1, characterized in that, the first connecting piece (10) passes through the main pipe (20) and the second connecting piece (30) passes through the main pipe (20). Adhesive and/or fastener (40) connections.
A production method of a stick, comprising the following steps:

disposing the fiber-reinforced composite material on the mandrel (60);

heating and curing the fiber-reinforced composite material arranged on the mandrel (60) to form the main pipe (20);

The main pipe (20) is connected with the first connecting piece (10) and the second connecting piece (30) which are made of metal to form an arm.
The production method according to claim 9, characterized in that, in the step of disposing the fiber-reinforced composite material on the mandrel (60),

The fibers soaked in the matrix material are wound on a mandrel (60), the two ends of the mandrel (60) are provided with connecting shafts (61), and the fibers are sandwiched with the axis of the connecting shaft (61) during winding. The angle is the winding angle, and the winding angle is in the range of 15°˜70°, or, the fiber cloth coated with the matrix material is laid on the mandrel (60).
The production method according to claim 9, characterized in that, in the step of disposing the fiber-reinforced composite material on the mandrel (60), the fiber-reinforced composite material disposed on the mandrel (60) is The thickness is in the range of 5mm to 50mm.
The production method according to claim 9, characterized in that, in the step of disposing the fiber-reinforced composite material on the mandrel (60), the fibers disposed on different cross-sections of the mandrel (60) Reinforced composites vary in thickness.