Splicing and sealing structure of carbon fiber pipe

Abstract

The utility model discloses a kind of splicing and sealing structure of carbon fiber pipe, comprising: first pipe and second pipe, sealing structure is set on the first pipe and second pipe, the first pipe and second pipe are connected by splicing structure between, a part of the splicing structure is located inside the first pipe, another part is located inside the second pipe.The first pipe and second pipe are made of carbon fiber material, so that the first pipe and second pipe are carbon fiber pipe, compared with 304 stainless steel under the same specification, carbon fiber weight is only 0.25 times of 304 stainless steel, deflection is 0.23 times, sealing structure is used to seal the first pipe and second pipe, prevent liquid from entering, the first pipe and second pipe are connected by splicing structure between, when splicing, splicing structure is located in the first pipe and second pipe, so that the first pipe and second pipe can be end-to-end connected, avoid splicing structure to cause influence to length, simultaneously by the first pipe and second pipe can protect splicing structure.

Description

Technical Field

[0001] This utility model relates to the field of displacement sensor technology, and more specifically, to a splicing and sealing structure for carbon fiber tubes. Background Technology

[0002] Gate hoists are large-scale hydraulic machinery used to control the opening and closing of gates in hydraulic structures. Their safety and ease of operation directly affect the operational efficiency of hydraulic facilities. Hydraulic gate hoists are the most widely used. The gate opening degree is mainly obtained by measuring the displacement of the piston rod of the hydraulic cylinder, and then converting the data through a functional relationship and amplification factor. Therefore, the accuracy of the sensor directly determines the accuracy of the gate opening degree.

[0003] Currently, cylinder stroke measurement mainly uses ceramic piston rod displacement sensors, magnetostrictive sensors, wire rope rotary encoders, and static magnetic grating displacement sensors.

[0004] 1. Ceramic piston rod sensors offer advantages such as corrosion resistance, wear resistance, high accuracy, and long lifespan. However, they suffer from complex structures, high manufacturing difficulty, and, more importantly, the inability to achieve absolute encoding. After a power outage, they must start detecting from zero, a significant drawback in industrial applications. Furthermore, the black ceramic coating is prone to peeling in certain areas, making maintenance difficult.

[0005] 2. Magnetostrictive displacement sensors have high accuracy and strong anti-interference ability; however, the longer the detection length, the greater the error. Currently, most of their ranges are within 5 meters. Excessive stroke also limits the working state of the hydraulic cylinder. When the hydraulic cylinder is in a horizontal state, the waveguide will wear due to deflection, which will shorten the service life of the sensor and make subsequent maintenance inconvenient.

[0006] 3. Wire Rope Rotary Encoder: This is the earliest mature product used in water conservancy projects. It uses a wire rope to drive a rotary encoder to measure the gate opening. Its installation on the hydraulic cylinder is divided into built-in and external types. Built-in types have strong anti-interference capabilities and high accuracy, but their structure is complex, installation requirements are high, and on-site maintenance is difficult. If the wire rope breaks, it may damage the inner wall of the hydraulic cylinder, causing greater losses. It also suffers from slippage and zero-point drift. External wire rope sensors are easier to maintain, but they are more susceptible to environmental influences and have poor reliability.

[0007] 4. Static magnetic grating displacement sensor: Compared with traditional products, it has significant advantages. It adopts absolute encoding to eliminate slippage and data drift; the static magnetic grating source and scale work in a suspended manner, with no mechanical wear and a longer life; it has a large measuring range and moderate resolution, and is suitable for more gate types.

[0008] Although the static magnetic grating displacement sensor performs best among the aforementioned four types of sensors, it faces a technical bottleneck, just like the other three types of sensors: it is difficult to achieve the required accuracy when measuring long strokes.

[0009] Due to the inherent properties of the materials, longer measurement strokes and larger product specifications ultimately lead to difficulties in installation and transportation. For example...

[0010] 1. When dealing with large or extra-large hydraulic cylinders, the outer diameter of the static magnetic grating displacement sensor is generally several hundred millimeters.

[0011] 2. When the measurement stroke is more than 7 meters, due to reasons such as production process, machining, and materials, the static magnetic grating displacement sensor produced is difficult to meet the usage requirements.

[0012] Therefore, how to make the static magnetic grating displacement sensor lightweight, low specific gravity, high hardness, good wear resistance and high tensile strength is the technical problem to be solved by this application. Utility Model Content

[0013] The utility model description section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This utility model description section is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0014] To at least partially solve the above problems, this utility model provides a splicing and sealing structure for carbon fiber tubes, including: a first tube and a second tube, both the first tube and the second tube are provided with sealing structures, the first tube and the second tube are connected by a splicing structure, a portion of the splicing structure is located inside the first tube and another portion is located inside the second tube.

[0015] Preferably, the sealing structure on the first tube is a first inner sealing structure, which is located inside the first tube.

[0016] Preferably, the first tube is provided with an end connector, which is located at the end of the first tube away from the first inner sealing structure.

[0017] Preferably, the end connector consists of an embedded part and a spherical bearing. The embedded part is located at the end of the first pipe away from the first inner sealing structure, and the spherical bearing is connected to the embedded part by a nut.

[0018] Preferably, the sealing structure on the second tube is a second inner sealing structure and an end sealing structure. The second inner sealing structure is disposed at one end of the second tube near the splicing structure and located inside the second tube, and the end sealing structure is disposed at one end of the second tube away from the splicing structure.

[0019] Preferably, a cover plate is provided on the second tube, the cover plate is located at the end of the second tube away from the splicing structure, and the second inner sealing structure is sealed inside the second tube.

[0020] Preferably, the sealing structure consists of a sealing ring and a sealant, wherein the sealant encapsulates the sealing ring inside a first tube or a second tube.

[0021] Preferably, the splicing structure consists of a support component and a fastener. A portion of the support component is located inside the first tube and connected to the first tube via the fastener. Another portion of the support component is located inside the second tube and connected to the second tube via the fastener. The support component contacts the inner wall of the first tube and the inner wall of the second tube, and is used for support and fixation from inside the first tube and the second tube.

[0022] Preferably, the support assembly consists of a first support member, a second support member, and an adjusting member;

[0023] A portion of the first support member is located inside the first tube, and another portion is located inside the second tube;

[0024] A portion of the second support member is located inside the first tube, and another portion is located inside the second tube;

[0025] The first support member and the second support member are connected by an adjusting member, which is used to adjust the relative distance between the first support member and the second support member.

[0026] Preferably, it also includes a plurality of inner cores, which are respectively disposed inside the first tube and the second tube.

[0027] Compared with the prior art, the present invention has at least the following beneficial effects:

[0028] Both the first and second tubes are made of carbon fiber material, making them both carbon fiber tubes. Compared with 304 stainless steel of the same specifications, carbon fiber weighs only 0.25 times that of 304 stainless steel and has a deflection of 0.23 times. The sealing structure is used to seal the first and second tubes to prevent liquid from entering. The first and second tubes are connected by a splicing structure. During splicing, the splicing structure is located inside the first and second tubes, allowing the first and second tubes to be connected end to end, avoiding the splicing structure from affecting the length. At the same time, the first and second tubes can protect the splicing structure.

[0029] The splicing and sealing structure of the carbon fiber tube described in this utility model, and other advantages, objectives and features of this utility model will be partly apparent from the following description, and partly understood by those skilled in the art through research and practice of this utility model. Attached Figure Description

[0030] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0031] Figure 1 This is a schematic diagram of the splicing and sealing structure of the carbon fiber tube described in this utility model.

[0032] Figure 2 This is a top view of the splicing and sealing structure of the carbon fiber tube described in this utility model.

[0033] Figure 3 This is a cross-sectional view of the splicing and sealing structure of the carbon fiber tube described in this utility model.

[0034] Figure 4 for Figure 3 Enlarged view of the splicing structure in the middle.

[0035] Figure 5 for Figure 3 Enlarged view of the mid-section connector.

[0036] Figure 6 for Figure 3 Enlarged view of the middle cover plate.

[0037] Figure 7 This refers to the direction of the sealant application for the second inner sealing structure.

[0038] In the figure: 1 First pipe, 2 Second pipe, 31 First inner sealing structure, 32 Second inner sealing structure, 33 End sealing structure, 4 Splicing structure, 41 Fixing component, 42 First support component, 43 Second support component, 44 Adjusting component, 5 End connector, 51 Embedded component, 52 Joint bearing, 53 Nut, 6 Cover plate, 7 Sealing ring, 8 Sealing adhesive, 9 Inner core. Detailed Implementation

[0039] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.

[0040] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0041] likeFigures 1-7 As shown, this utility model provides a splicing and sealing structure for carbon fiber tubes, including: a first tube 1 and a second tube 2. Both the first tube 1 and the second tube 2 are made of carbon fiber material, making both the first tube 1 and the second tube 2 carbon fiber tubes. Compared with 304 stainless steel, the weight of the component made of carbon fiber material (usually referring to the measuring rod) of the same specifications is only 0.25 times that of the 304 stainless steel component, and the deflection (it should be noted that the deflection does not refer to the tube alone, but to the deflection of the static magnetic grating displacement sensor component made of various materials) is 0.23 times, as shown in Table 1.

[0042] Material Pipe type Thickness Weight (kg) Angle Length (m) Deflection 304 80*80 1.5 59 90° 16 539 Aluminium (0.7) 80*80 1.5 23.8 90° 16 600 Carbon fibre (2.1) 80*80 1.5 14.8 90° 16 124 2205 Duplex steel (2.76) 80*80 1.5 60.3 90° 16 385

[0043] Table 1

[0044] Note: The deflection of a slender object (such as a beam or column) refers to the displacement of each point on its axis within the plane normal to the axis at that point during deformation. In other words, it's the deformation of the rod. In engineering applications, smaller deflection is better.

[0045] Because carbon fiber tubes cannot be welded, and the hydraulic gates are non-standard designs with different measurement stroke requirements for each gate, how to splice the first tube 1 and the second tube 2 together is a technical problem that needs to be solved further.

[0046] Both the first tube 1 and the second tube 2 are provided with sealing structures. The sealing structures are used to seal the first tube 1 and the second tube 2 to prevent liquid from entering. The first tube 1 and the second tube 2 are connected by a splicing structure 4. Part of the splicing structure 4 is located inside the first tube 1 and the other part is located inside the second tube 2. When splicing, the splicing structure 4 is located inside the first tube 1 and the second tube 2, so that the first tube 1 and the second tube 2 can be connected end to end, avoiding the splicing structure 4 from affecting the length. At the same time, the first tube 1 and the second tube 2 can protect the splicing structure 4.

[0047] Furthermore, it also includes several inner cores 9, which can be used to position the sealing structure during installation. The inner cores 9 are respectively disposed inside the first tube 1 and the second tube 2, and the inner cores 9 are encapsulated in the first tube 1 or the second tube 2 by the sealing structure.

[0048] Furthermore, the first pipe 1 is a pipe located at the front end, and the sealing structure on the first pipe 1 is a first inner sealing structure 31, which is located inside the first pipe 1. An end connector 5 is provided on the first pipe 1, and the end connector 5 is located at the end of the first pipe 1 away from the first inner sealing structure 31, thereby making the first pipe 1 open at only one end and closed at the other end, such as... Figure 1 , Figure 2 , Figure 3 andFigure 5 As shown, a first inner sealing structure 31 can be provided on the first tube 1 to achieve internal sealing. During splicing, an inner core 9 is first placed inside the first tube 1, and then the inner core 9 is sealed inside the first tube 1 by the first inner sealing structure 31. To ensure the installation and accommodation of the splicing structure 4, the first inner sealing structure 31 is located inside the first tube 1. When the splicing structure 4 is connected to the first tube 1, the first inner sealing structure 31 can abut against the end of the splicing structure 4, or leave a gap between it and the splicing structure 4. The splicing structure 4 can encapsulate the first inner sealing structure 31 inside the first tube 1, preventing the first inner sealing structure 31 from coming out of the first tube 1, thereby maintaining the sealing effect of the first tube 1. The inner core 9 can provide support for the installation of the first inner sealing structure 31.

[0049] Furthermore, the end connector 5 consists of an embedded part 51 and a spherical bearing 52. The embedded part 51 is located at the end of the first pipe 1 away from the first inner sealing structure 31, and the spherical bearing 52 is connected to the embedded part 51 by a nut 53. Typically, the embedded part 51 and the first pipe 1 are integrally formed. The embedded part 51 can be a metal part with a flange, and the embedded part 51 is provided with threads for installing the spherical bearing 52. The nut 53 is used to lock and reinforce the connection between the spherical bearing 52 and the embedded part 51.

[0050] Furthermore, the second tube 2 is a tube located at the rear end, and the difference between the second tube 2 and the first tube 1 is that the second tube 2 is open at both ends. The sealing structure on the second tube 2 is a second inner sealing structure 32 and an end sealing structure 33. The second inner sealing structure 32 is located at the end of the second tube 2 close to the splicing structure 4 and is located inside the second tube 2. The end sealing structure 33 is located at the end of the second tube 2 away from the splicing structure 4.

[0051] A cover plate 6 is provided on the second tube 2, located at the end of the second tube 2 away from the splicing structure 4, and seals the second inner sealing structure 32 inside the second tube 2. This allows one end of the second tube 2 to form a closed end through the cover plate 6, and the other end to be sealed through the second inner sealing structure 32. During splicing, an inner core 9 is first placed inside the second tube 2, then the end sealing structure 33 is installed inside the second tube 2, and then the end of the second tube 2 is sealed by the cover plate 6, thus encapsulating the end sealing structure 33 inside the second tube 2. The inner core 9 is then sealed inside the second tube 2 by the second inner sealing structure 32. To ensure the installation and accommodation of the splicing structure 4, the second inner sealing structure 32 is located inside the second tube 2. When the splicing structure 4 is connected to the second tube 2, the second inner sealing structure 32 can abut against the end of the splicing structure 4, or leave a gap between it and the splicing structure 4. The splicing structure 4 can encapsulate the second inner sealing structure 32 inside the second tube 2, preventing the second inner sealing structure 32 from detaching from the second tube 2, thereby maintaining the sealing effect of the second tube 2. The inner core 9 can provide support for the installation of the end sealing structure 33 and the second inner sealing structure 32.

[0052] Furthermore, it also includes several third tubes, which are extension tubes located between the first tube 1 and the second tube 2. When the length of the first tube 1 and the second tube 2 cannot meet the measurement stroke, a third tube can be installed between the first tube 1 and the second tube 2 to increase the length. Two third inner sealing structures are set inside the third tube, and the two third inner sealing structures are connected by an inner core 9. During splicing, the inner core 9 is first set inside the third tube, and then the two third inner sealing structures are installed inside the third tube, with the two third inner sealing structures located at opposite ends of the inner core 9. The inner core 9 is sealed inside the third tube by the third inner sealing structures. To ensure the installation and accommodation of the splicing structure 4, both third inner sealing structures are located inside the third tube. When the splicing structure 4 is connected to the third tube, the third inner sealing structure can abut against the end of the splicing structure 4, or leave a gap between it and the splicing structure 4. The splicing structure 4 can encapsulate the third inner sealing structure inside the third tube, preventing the third inner sealing structure from coming out of the third tube, thereby maintaining the sealing effect of the third tube. The inner core 9 can provide support for the installation of the two third inner sealing structures.

[0053] Furthermore, the sealing structure consists of a sealing ring 7 and sealant 8, with the sealant 8 encapsulating the sealing ring 7 within the first tube 1 or the second tube 2. Before the first tube 1 and the second tube 2 are joined (and before the cover plate 6 of the second tube 2 is installed), sealant 8 needs to be applied for sealing. The sealing position is determined by the inner core 9 and the sealing ring 7. Typically, the sealing ring 7 has a groove for connecting with the inner core 9, such as... Figure 4 and Figure 6As shown, this facilitates the connection between the sealing ring 7 and the inner core 9. After the sealing ring 7 is installed, the sealant 8 is injected. The thickness of the sealant 8 can be adjusted. Usually, the installation position of the splicing structure 4 (and the cover plate 6) needs to be reserved.

[0054] The splicing structure 4 consists of a support component and a fastener 41. A portion of the support component is located inside the first tube 1 and connected to it via the fastener 41. Another portion of the support component is located inside the second tube 2 and connected to it via the fastener 41. Typically, the fastener 41 is a countersunk screw, and mounting holes are pre-drilled on both the first tube 1 and the second tube 2. After the support component is fixed with the countersunk screw, the countersunk screw can be positioned within the mounting holes. The support component contacts the inner walls of the first tube 1 and the second tube 2, providing support and fixation from within the first tube 1 and the second tube 2.

[0055] The support assembly consists of a first support member 42, a second support member 43, and an adjusting member 44;

[0056] A portion of the first support member 42 is located inside the first tube 1, and another portion is located inside the second tube 2;

[0057] A portion of the second support member 43 is located inside the first tube 1, and another portion is located inside the second tube 2;

[0058] The first support member 42 and the second support member 43 are connected by an adjusting member 44, which is used to adjust the relative distance between the first support member 42 and the second support member 43. The adjusting member 44 is typically a hex socket head cap screw. Adjustment holes for a hex wrench are pre-drilled on the first tube 1 and the second tube 2. The first support member 42 and the second support member 43 have threaded holes corresponding to the positions of the adjustment holes, and their positions are opposite. After the hex socket head cap screw is screwed into the threaded holes of the first support member 42 and the second support member 43, rotating the hex socket head cap screw can cause the distance between the first support member 42 and the second support member 43 to shrink or expand. The first support member 42 also has threaded holes adapted to the positions of mounting holes for installing countersunk screws.

[0059] The support assembly consists of two parts. The first support member 42 is threaded for fastening countersunk screws and socket head cap screws. The second support member 43 has threaded holes or countersunk grooves to facilitate the connection of socket head cap screws.

[0060] During assembly, first prepare the sealed first tube 1 and second tube 2. Then connect the first support member 42 and the second support member 43 with hex socket screws, adjusting their spacing to facilitate inserting the support assembly into the first tube 1. Secure the first tube 1 and the first support member 42 with countersunk screws. Next, insert it into the second tube 2 and tighten the other two countersunk screws. Finally, rotate the hex socket screws to adjust the relative position between the first support member 42 and the second support member 43 until they are taut, completing the assembly.

[0061] Taking a lightweight test project for a valve stroke detection device as an example, the project purchased two carbon fiber tubes, each 1m long and 30.5mm × 50.5mm in outer diameter, as the first tube 1 and the second tube 2, respectively, for testing. (It should be noted that the carbon fiber tubes used were readily available; the common specifications on the market are 1000mm in length and 2mm in thickness. Other specifications require custom molding, which costs over 20,000 yuan, making custom molding too expensive.) The measurement data of the spliced ​​static magnetic grating is compared with the measurement data of the grating ruler (detection stroke 1 meter), as shown in Table 2.

[0062]

[0063]

[0064] Table 2

[0065] It can be seen that the error of the spliced ​​magnetic grating data within the stroke is all below 0.5mm, which shows that the magnetic grating extended by the splicing structure 4 still has extremely high measurement accuracy.

[0066] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0067] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0068] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A splicing and sealing structure for carbon fiber tubes, comprising: The first tube (1) and the second tube (2) are characterized in that a sealing structure is provided on both the first tube (1) and the second tube (2), and the first tube (1) and the second tube (2) are connected by a splicing structure (4), wherein a part of the splicing structure (4) is located inside the first tube (1) and the other part is located inside the second tube (2).

2. The splicing and sealing structure of carbon fiber tubes according to claim 1, characterized in that, The sealing structure on the first tube (1) is a first inner sealing structure (31), which is located inside the first tube (1).

3. The splicing and sealing structure of carbon fiber tubes according to claim 2, characterized in that, An end connector (5) is provided on the first tube (1), and the end connector (5) is located at the end of the first tube (1) away from the first inner sealing structure (31).

4. The splicing and sealing structure of carbon fiber tubes according to claim 3, characterized in that, The end connector (5) consists of an embedded part (51) and a spherical bearing (52). The embedded part (51) is located at the end of the first pipe (1) away from the first inner sealing structure (31). The spherical bearing (52) is connected to the embedded part (51) by a nut (53).

5. The splicing and sealing structure of carbon fiber tubes according to claim 1, characterized in that, The sealing structure on the second tube (2) is a second inner sealing structure (32) and an end sealing structure (33). The second inner sealing structure (32) is located at one end of the second tube (2) near the splicing structure (4) and inside the second tube (2). The end sealing structure (33) is located at one end of the second tube (2) away from the splicing structure (4).

6. The splicing and sealing structure of carbon fiber tubes according to claim 5, characterized in that, The second tube (2) is provided with a cover plate (6), which is located at the end of the second tube (2) away from the splicing structure (4) and seals the second inner sealing structure (32) inside the second tube (2).

7. The splicing and sealing structure of carbon fiber tubes according to claim 1, characterized in that, The sealing structure consists of a sealing ring (7) and a sealant (8), wherein the sealant (8) encapsulates the sealing ring (7) inside a first tube (1) or a second tube (2).

8. The splicing and sealing structure of carbon fiber tubes according to claim 1, characterized in that, The splicing structure (4) consists of a support component and a fastener (41). A part of the support component is located inside the first tube (1) and is connected to the first tube (1) through the fastener (41). The other part of the support component is located inside the second tube (2) and is connected to the second tube (2) through the fastener (41). The support component contacts the inner wall of the first tube (1) and the inner wall of the second tube (2) for supporting and fixing from the inside of the first tube (1) and the second tube (2).

9. The splicing and sealing structure of carbon fiber tubes according to claim 8, characterized in that, The support assembly consists of a first support member (42), a second support member (43), and an adjusting member (44); A portion of the first support member (42) is located inside the first tube (1), and another portion is located inside the second tube (2); A portion of the second support member (43) is located inside the first tube (1), and another portion is located inside the second tube (2); The first support member (42) and the second support member (43) are connected by an adjusting member (44) for adjusting the relative distance between the first support member (42) and the second support member (43).

10. The splicing and sealing structure of carbon fiber tubes according to claim 1, characterized in that, It also includes several inner cores (9), which are respectively disposed inside the first tube (1) and the second tube (2).

Images