CN110947527B - Structure for reinforcing signal data pipeline of supergravity centrifugal machine - Google Patents

Abstract

The invention discloses a structure for strengthening the signal data pipeline of a supergravity centrifuge. The reinforced structure is installed on the high-speed rotating arm of the hypergravity centrifuge, and the reinforced structure is installed on the top surface of the high-speed rotating arm. Various pipelines are arranged and fixed inside the reinforced structure. The reinforced structure includes structural units arranged symmetrically on the upper and lower sides of the various pipelines. and the reinforced carbon fiber composite layer outside the structural unit, the structural units on the upper and lower sides are wrapped above and below the pipeline respectively, and the concave part of the structural unit between the adjacent two pipelines is filled with the reinforced carbon fiber composite layer. The unit and the reinforced carbon fiber composite layer are composed of multi-layer carbon fiber composite material layers with different fiber arrangements. The signal data line reinforcement structure of the present invention can overcome the huge pulling force caused by the high-speed rotation of the supergravity centrifuge during use, and prevent the signal data line from being thrown out and broken under the high-speed operation of the centrifuge. The signal data line is firmly fixed and the structure is simple.

Description

A structure for strengthening signal data pipeline of hypergravity centrifuge

technical field

The invention relates to an internal structure of a hypergravity centrifuge in the field of structural strengthening structure design under a hypergravity centrifugal field, in particular to a design of a strengthening structure for a signal data line in a hypergravity centrifugal field.

Background technique

The hypergravity centrifuge is an important experimental device for time-lapse and scale-down experiments to study the evolution of geological processes, the migration of soil pollutants, and the disasters of deep-sea and deep-sea engineering. The incoming and outgoing pipelines such as lines, water and gas are subject to huge centrifugal force, and the huge centrifugal force can easily cause these signal data lines and material in and out pipelines to be cracked and broken after being fixed. Therefore, in order to ensure that the signal data line and the material conveying pipeline can be used normally during the measurement of the hypergravity field, it is necessary to strengthen and fix the structure.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the shortcomings that the signal data line is difficult to fix under the supergravity field and is easily broken and damaged during use, and to design a fixed reinforcement structure for the signal data line, which can make the reinforcement structure including the signal data line in the It bears a lot of pulling force during use to prevent the signal data line from being thrown out and broken under the high-speed operation of the supergravity centrifuge. Suitable for ultra-gravity centrifuges and other high-speed running equipment.

The technical scheme adopted in the present invention is:

The reinforcing structure of the present invention is installed on the high-speed rotating arm of the supergravity centrifuge, and the reinforcing structure is fixed and positioned on the top surface of the high-speed rotating arm by means of hexagon socket screws and anti-loose washers, and at the same time, the lower surface of the reinforcing structure is bonded on the top surface of the high-speed rotating arm with an adhesive. On the top surface of the high-speed rotating arm; various pipelines are arranged and fixed inside the reinforced structure. One end of each pipeline enters the hypergravity experimental cabin through the pipeline entry joint to connect with each instrument, and the other end of each pipeline is connected to the supergravity centrifuge. The central rotating shaft extends and penetrates into the hollow cavity of the central rotating shaft and is connected with the slip ring mechanism on the central rotating shaft.

Various types of pipelines include metal pipes, wires, optical fiber data lines, non-metallic pipes, shielded and insulated pipelines and sensor leads.

The reinforcing structure includes carbon fiber composite material layers and reinforced carbon fiber leveling layers symmetrically arranged on the upper and lower sides of various pipelines, respectively, and the fiber composite material layers and reinforced carbon fiber leveling layers on the upper and lower sides are respectively wrapped above and below the pipeline. , the concave part of the structural unit between two adjacent pipelines is filled with a reinforced carbon fiber leveling layer to form a sandwich composite reinforced sandwich structure; the composite reinforced sandwich structure is composed of five or more layers with different fiber directions. The carbon fiber composite material layer is laminated. The single-layer carbon fiber composite material layer is composed of several reinforced carbon fibers embedded in the epoxy resin matrix at parallel intervals. The reinforcing carbon fibers in the five-layer carbon fiber composite material layer are arranged in different parallel directions. The parallel arrangement direction of the reinforced carbon fibers in the layer structure unit is from bottom to top, respectively, two continuous along the direction perpendicular to the pipeline, along the direction parallel to the pipeline, and the included angles between the two continuous along and the pipeline direction are 60° and -60° °; The reinforced carbon fiber leveling layer is also composed of several reinforced carbon fibers embedded in the epoxy resin matrix at parallel intervals, and the parallel arrangement direction of the reinforced carbon fibers of the reinforced carbon fiber leveling layer is parallel to the pipeline direction.

The carbon fiber composite material layer is replaced with reinforced glass fiber, reinforced aramid fiber or boron fiber.

The epoxy resin matrix is replaced by bismaramide resin, phenolic resin and the like.

The beneficial effects of the present invention are:

The signal data line of the present invention strengthens the fixed structure. Since the signal data line is embedded in the middle of the carbon fiber layer, when the rotating shaft drives the rotating arm to rotate at a high speed, the huge centrifugal force that the signal data line bears will be distributed on the carbon fiber layer, and almost all of it is made of carbon fiber. layer undertakes. Because the mass of carbon fiber composites is very small, the centrifugal force is also very small, and it has extremely high axial tensile strength, so the carbon fiber layer can overcome the huge tensile force caused by centrifugal force.

Considering the Poisson effect, the carbon fiber layer is designed to be laid at multiple angles, which can enhance the tensile strength of the signal data line reinforcement structure in different directions. Under the reinforced structure, the signal data line is firmly fixed and the structure is simple.

Description of drawings

FIG. 1 is a front view of the reinforcing structure of the present invention.

FIG. 2 is a plan view of the present reinforcement structure.

FIG. 3 is a cross-sectional view of the reinforcing structure.

FIG. 4 is a fiber laying diagram of an embodiment of the reinforcing structure.

In the figure: 1. Hypergravity experimental cabin, 2. Pipeline entry joint, 3. Reinforcement structure, 4. High-speed rotating arm, 5. Bearing system, 6. Slip ring mechanism, 7. Pipeline outlet joint, 8. Center shaft, 9. Reinforced carbon fiber leveling layer, 10, Metal tube, 11, Conductor, 12, Optical fiber data cable, 13, Non-metallic tube, 14, Shielded insulation pipeline, 15, Sensor lead, 16, Hex socket head cap screw, 17, Anti-loose gasket, 18, various types of pipelines, 19, splines, 20, carbon fiber composite material layer, 21, reinforced carbon fiber, 22, epoxy resin matrix.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and embodiments, but the embodiments are not intended to limit the present invention.

As shown in Figures 1 and 2, the hypergravity centrifuge has a high-speed rotating arm 4, a bearing system 5, a hypergravity experimental cabin 1 and a central shaft 8, and two hypergravity experimental cabins 1 are mounted on two of the high-speed rotating arms 4. At the outer end, the middle part of the high-speed rotating arm 4 is coaxially connected with the central rotating shaft 8 through the spline 19, and the central rotating shaft 8 is installed on the bearing system 5 to form the rotor system of the hypergravity centrifuge; On the rotating arm 4, the reinforcing structure 3 is fixed and positioned on the top surface of the high-speed rotating arm 4 through the hexagon socket head screw 16 and the anti-loosening washer 17, and at the same time, the lower surface of the reinforcing structure 3 is bonded to the top surface of the high-speed rotating arm 4 with adhesive. superior.

Various types of pipelines 18 are arranged and fixed inside the reinforcement structure 3. The whole of various pipelines 18 is placed in the middle of the reinforcement structure 3 to be strengthened. , the other ends of the various pipelines 18 extend to the central rotating shaft 8 of the hypergravity centrifuge and penetrate into the hollow cavity of the central rotating shaft 8 and are connected with the slip ring mechanism 6 on the central rotating shaft 8, and are connected to the pipeline after passing through the slip ring mechanism 6. The lead-out joint 7 is led out to the outside of the centrifuge chamber of the supergravity centrifuge, and the pipeline lead-out joint 7 is located on the top of the central rotating shaft 8 .

In a specific implementation, the slip ring mechanism 6 may specifically include an outer slip ring and an inner slip ring, the outer slip ring may be fixed on the inner wall of the centrifuge chamber of the hypergravity centrifuge, and the inner slip ring may be fixed on the outer wall of the central rotating shaft.

As shown in FIG. 3 , various types of pipelines 18 include metal pipes 10 , wires 11 , optical fiber data lines 12 , non-metal pipes 13 , shielded and insulated pipelines 14 and sensor leads 15 .

As shown in FIG. 4 , the reinforcing structure 3 includes structural units symmetrically arranged on the upper and lower sides of various pipelines 18 and a reinforced carbon fiber composite layer 9 outside the structural units. The structural units on the upper and lower sides are wrapped on the top and bottom of the pipeline 18 respectively. , the concave part formed by the structural unit between the two adjacent pipelines 18 is filled with the reinforced carbon fiber composite layer 9, so that the outer surface of the reinforced carbon fiber composite layer 9 is flush with the outer surface of the structural unit after filling, so as to form a sandwich Composite reinforced sandwich structure.

The above-mentioned structural units are formed by stacking five layers of carbon fibers or more layers with different fiber arrangements. In this embodiment, five layers of composite material layers 20 are stacked and formed. The single-layer carbon fiber composite material layer 20 is composed of several reinforced carbon fibers 21. It is formed in the epoxy resin matrix 22, and the reinforcing carbon fibers 21 in the five-layer carbon fiber composite material layer 20 are arranged in different directions in parallel, forming multi-angle laying, and the reinforcing carbon fibers 21 in the five-layer structural unit on the upper side are arranged in parallel from bottom to top. The included angles between the two continuous along the direction perpendicular to the pipeline 18, along the direction parallel to the pipeline 18, and the two continuous along the direction of the pipeline 18 are 60° and -60°, and the direction perpendicular to the pipeline 18 is 0° The arrangement angle is 0°, 0°, 90°, 30°, -30°, and the five-layer structural unit on the lower side and the five-layer structural unit on the upper side are symmetrical with the horizontal midline of the reinforcement structure 3 .

The reinforced carbon fiber composite layer 9 is also composed of several reinforced carbon fibers 21 embedded in the epoxy resin matrix 22 at parallel intervals. The parallel arrangement direction of the reinforced carbon fibers 21 of the reinforced carbon fiber composite layer 9 is parallel to the direction of the pipeline 18 .

In the specific implementation, various types of pipelines 18 are arranged at equal intervals in the middle of the upper and lower structural units, and the reinforced carbon fiber composite layer 9 and the high-speed rotating arm 4 are connected by hexagon socket screws 16 and adhesives.

Embodiments of the present invention are as follows:

According to accompanying drawing 1, a 1500g hypergravity centrifuge, the inner radius of the machine is 9.7m, the radius of the centrifuge arm is 4.5m, the maximum linear speed of the rotor is 300m/s, and the diameter of the one wrapped in the carbon fiber layer is 3mm. The copper wire (the density of copper ρ ₁ is 8.96×10 ³ kg/m ³ ) is used as a pipeline, then the mass m ₁ of the copper wire is:

m ₁ =ρ ₁ V ₁ =8.96×10 ⁻³ ×π×1.5 ² ×4500×10 ⁻³ =0.285kg

Among them, V ₁ represents the volume of a single copper wire on the rotating arm.

The magnitude of the centrifugal force F ₁ on the copper wire is:

表示离心机旋转角速度，rad/s；v表示离心机转子线速度，m/s；r表示离心机转臂半径，m。r ₁ represents half of the radius of the centrifuge arm, m;

represents the rotational angular velocity of the centrifuge, rad/s; v represents the linear velocity of the centrifuge rotor, m/s; r represents the radius of the centrifuge arm, m.

Then the tensile stress σ ₁ on the copper wire is:

Among them, A ₁ represents the transverse cross-sectional area of a single copper wire, mm ² .

It can be seen from the calculation results that the tensile stress of the copper wire has obviously exceeded its allowable stress (the yield strength limit of brass is 200MPa-300MPa), so the copper wire must be strengthened.

The concretely implemented reinforcing structure is divided into structural units symmetrically arranged on the upper and lower sides of various pipelines 18 and a reinforced carbon fiber composite layer 9 outside the structural units. The concave portion formed by the structural unit between the two pipelines 18 is filled and flushed with the reinforced carbon fiber composite layer 9, so that the reinforced structure as a whole has a rectangular cross-section, thereby forming a sandwich composite reinforced sandwich structure.

The two structural units include a total of 10 layers of carbon fiber composite material 20, each layer is 0.125mm thick, and each structural unit is laid out from the inner side near the pipeline along the thickness direction: 2 layers at 0°, 1 layer at 90°, 30 ° Lay 1 layer, -30° lay 1 layer, 0° is perpendicular to the direction of pipeline 18, and the layers are symmetrically laid.

The density of the carbon fiber laminate is about 1.5×10 ³ kg/m ³ , the length is 2440mm, and the width is 800mm, then the mass m ₂ of the carbon fiber laminate is:

m ₂ =ρ ₂ V ₂ =1.5×10 ⁻³ ×2440×800×1.25×10 ⁻³ =3.66kg

Wherein, ρ ₂ represents the density of the carbon fiber laminate, kg/m ³ ; V ₂ represents the volume of the carbon fiber laminate, m ³ .

Then the centrifugal force F ₂ generated by the carbon fiber layer is:

Therefore, the magnitude of the total centrifugal force F is:

F=F ₁ +F ₂ =2850+36603.7=39453.7N

Since the copper wire is completely covered by the carbon fiber reinforced material, it is considered that the centrifugal force is fully borne by the carbon fiber layer, and the cross-sectional area A ₂ of the carbon fiber that bears the tensile force in the longitudinal direction is:

A ₂ =2×[0.125×800×2+0.125×800×cos30°×2]=746.4mm ²

Then the tensile stress on the carbon fiber layer is:

This value is far less than the longitudinal tensile strength of 2500MPa of carbon fiber composites, so the designed carbon fiber reinforced structure meets the strength requirements.

The implementation situation of the comparative example is as follows:

The two structural units include a total of 10 layers of carbon fiber composite material 20, each layer is 0.125mm thick, and each structural unit is laid out from the inner side near the pipeline along the thickness direction: 1 layer at 0°, 1 layer at 90°, 0 1 layer at °, 1 layer at 90°, 1 layer at 0°. 0° is the direction perpendicular to the pipeline 18, and the layers are symmetrically laid accordingly. The centrifugal force calculation is the same as above.

In this case, the size of the carbon fiber cross-sectional area A ₃ that bears the tensile force in the longitudinal direction is:

A ₃ =2×(0.125×800×3)=600mm ²

Then the tensile stress on the carbon fiber layer is:

It can be seen that in this case, the longitudinal tensile stress on the carbon fiber layer is greater than the calculation result of the embodiment, so the low-angle laying method should be used as much as possible when the number of laying layers is the same.

Therefore, the signal data line reinforcement structure of the present invention can overcome the huge pulling force caused by the high-speed rotation of the supergravity centrifuge during use, and prevent the signal data line from being thrown out and broken under the high-speed operation of the centrifuge. The signal data line is firmly fixed and the structure is simple, which fills the gap in the industry and has outstanding technical effects.

In addition to the above-mentioned embodiments, the present invention can also have other implementations, for example, the pipes can be changed into other types of shapes and densities, etc., the laying angle of the carbon fiber layer can be changed, and the number of laying layers can be changed for reinforcement. All technical solutions formed by using equivalent replacements fall within the protection scope of the present invention.

Claims (4)

1. The utility model provides a be used for structure that hypergravity centrifuge signal data pipeline strengthened which characterized in that: the reinforcing structure (3) is arranged on the high-speed rotating arm (4) of the supergravity centrifugal machine, the reinforcing structure (3) is fixedly positioned and arranged on the top surface of the high-speed rotating arm (4) through an inner hexagon screw (16) and a check washer (17), and meanwhile, the lower surface of the reinforcing structure (3) is bonded on the top surface of the high-speed rotating arm (4) through an adhesive; various pipelines (18) are arranged and fixed in the reinforcing structure (3), one end of each pipeline (18) enters the hypergravity experiment chamber (1) through the pipeline in-chamber joint (2) and is connected with each instrument, the other end of each pipeline (18) extends towards the central rotating shaft (8) of the hypergravity centrifugal machine and penetrates into the hollow cavity of the central rotating shaft (8) and is connected with the slip ring mechanism (6) on the central rotating shaft (8), the other end of each pipeline (18) is connected to the pipeline leading-out joint (7) after passing through the slip ring mechanism (6) and is led out of the centrifugal chamber of the hypergravity centrifugal machine, the reinforcing structure (3) comprises carbon fiber composite material layers (20) and reinforced carbon fiber leveling layers (9) which are respectively and symmetrically arranged at the upper side and the lower side of each pipeline (18), the carbon fiber composite material layers (20) and the reinforced carbon fiber leveling layers (9) at the upper side and the lower side, filling and leveling the concave part of the structural unit between two adjacent pipelines (18) by adopting a reinforced carbon fiber leveling layer (9), thereby forming a sandwich composite reinforced sandwich structure; the composite reinforced sandwich structure is formed by laminating five or more carbon fiber composite material layers (20) with different fiber directions, wherein a single-layer carbon fiber composite material layer (20) is formed by embedding a plurality of reinforcing carbon fibers (21) in an epoxy resin matrix (22) at intervals in parallel, the parallel arrangement directions of the reinforcing carbon fibers (21) in the five carbon fiber composite material layers (20) are different, the parallel arrangement directions of the reinforcing carbon fibers (21) in the five structural units at the upper side are respectively two continuous directions from bottom to top, and the included angles between the two continuous directions and the pipeline (18) direction are 60 degrees and-60 degrees; the reinforcing carbon fiber leveling layer (9) is also formed by embedding a plurality of reinforcing carbon fibers (21) in an epoxy resin matrix (22) in parallel at intervals, and the parallel arrangement direction of the reinforcing carbon fibers (21) of the reinforcing carbon fiber leveling layer (9) is parallel to the direction of the pipeline (18).

2. The structure for reinforcing signal data pipelines of a supergravity centrifuge as claimed in claim 1, wherein: the various pipelines (18) comprise metal pipes (10), conducting wires (11), optical fiber data lines (12), non-metal pipes (13), shielding and insulating pipelines (14) and sensor leads (15).

3. The structure for reinforcing signal data pipelines of a supergravity centrifuge as claimed in claim 1, wherein: the carbon fiber composite material layer (20) is replaced by reinforced glass fiber, reinforced aramid fiber or boron fiber.

4. The structure for reinforcing signal data pipelines of a supergravity centrifuge as claimed in claim 1, wherein: the epoxy resin matrix (22) is replaced by bismaleimide resin and phenolic resin.

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