Protective device for gooseneck section of marine riser

Abstract

The invention discloses a protective device for a marine riser gooseneck section, which comprises a protective outer cover and a turbulent flow assembly, the protective outer cover covers the outer side of a riser gooseneck to cover the riser gooseneck, the turbulent flow assembly is arranged at the peripheral part of the outer side of the protective outer cover, and the turbulent flow assembly comprises a plurality of turbulent flow blocks which can be spliced and combined along the length direction of the riser gooseneck section; the vertical pipe gooseneck section is covered with the protective outer cover, the inner structure of the protective outer cover is protected, the problem that foreign objects fall down and directly act on the vertical pipe gooseneck section to damage the vertical pipe gooseneck section is solved, the service life of the vertical pipe gooseneck section is prolonged, the service life of the vertical pipe gooseneck section is prolonged, and the service life of the vertical pipe gooseneck section is prolonged. The vertical pipe gooseneck section is prevented from being directly scoured by ocean current, and the protection effect is achieved; in addition, the turbulent flow assemblies are arranged on the periphery of the protective outer cover, the flowing direction of the flowing ocean current can be changed to enable the ocean current to flow upwards, and the sediment scouring effect of the gooseneck section of the stand pipe is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of marine engineering, and in particular to a protective device for a gooseneck section of a marine riser. Background Art

[0002] Marine engineering, especially the exploration and exploitation of deep-sea oil and gas resources, is a key link in the global energy strategy. However, the complexity and unpredictability of the marine environment poses great challenges to the construction and maintenance of related facilities. Among them, the riser gooseneck is an important part connecting the middle of the submarine pipeline, such as Figure 1 As shown in the figure, the structural integrity and functionality are directly related to the safety and efficiency of the entire operation. However, the existing riser gooseneck has the following problems: First, the riser gooseneck is subjected to long-term seawater erosion, which is prone to form scour pits, causing the riser gooseneck to lose support, and the overall stress state changes. Under the continuous scouring of ocean currents, the pipeline vibrates and even causes fatigue damage; second, the riser gooseneck is close to the bottom of the conductor frame, which has a greater risk of falling objects and is prone to third-party damage.

[0003] Therefore, there is an urgent need for a protective device for the gooseneck section of a marine riser to solve the above technical problems. Summary of the invention

[0004] The present invention aims to solve the above-mentioned technical problems, namely, to solve the following problems existing in the existing riser gooseneck: first, the riser gooseneck is subjected to long-term erosion by seawater, which easily forms scour pits, causing the riser gooseneck to lose support and change the overall stress state, causing pipeline vibration under the continuous scouring of ocean currents, and even leading to fatigue damage; second, the riser gooseneck is close to the bottom of the conductor rack, with a greater risk of falling objects, which is easy to cause third-party damage.

[0005] To this end, the present invention provides a protective device for a gooseneck section of a marine riser, comprising a protective cover and a spoiler assembly, wherein the protective cover is covered on the outside of the riser gooseneck to cover it, and a spoiler assembly is arranged on the peripheral portion of the outside of the protective cover, and the spoiler assembly is configured to reduce the scouring force of the ocean current on the base of the riser gooseneck and the protective cover by changing the flow direction and speed of the ocean current.

[0006] In the above specific implementation of the protective device for the gooseneck section of the marine riser, the cross-sectional shape of the protective outer cover perpendicular to the gooseneck section of the riser is an isosceles trapezoid, and the top wall thickness of the protective outer cover is greater than the wall thickness of the two waist-shaped side walls.

[0007] In the above-mentioned specific embodiment of the protective device for the gooseneck section of the marine riser, the spoiler assembly includes a plurality of spoiler blocks that can be spliced ​​and combined along the length direction of the riser gooseneck section, and the spoiler blocks are provided with an arc structure to change the flow direction of the incoming ocean current so that it flows upward.

[0008] In the above-mentioned specific implementation of the protective device for the gooseneck section of the marine riser, the spoiler block includes a support frame and a plurality of arc-shaped plates, the arc-shaped plates are provided with a plurality of water-permeable holes, the plurality of arc-shaped plates are all fixed on the support frame in an inclined manner and the inclination angle of each arc-shaped plate is the same, and when the spoiler block is placed at the peripheral part of the protective outer cover, the plurality of arc-shaped plates are arranged in sequence in a direction gradually approaching the protective outer cover to change the flow direction of the flowing ocean current so that it flows upward.

[0009] In the above-mentioned specific implementation of the protective device for the gooseneck section of the marine riser, the diameters of the water-permeable holes on the multiple arc-shaped plates are different and decrease in sequence according to the arrangement order of the arc-shaped plates. The arc-shaped plate with the water-permeable holes with the largest diameter is located on the outermost side, and the water-permeable holes on two adjacent arc-shaped plates are arranged in a staggered manner.

[0010] In the above-mentioned specific implementation of the protective device for the gooseneck section of the marine riser, the support frame is a right-angle frame, one end of the arc plate is fixedly connected to a right-angle wall of the support frame, and the other end of the arc plate is fixedly connected to another right-angle wall of the support frame. A connecting block is fixed to one side end of the support frame, and a connecting socket that cooperates with the connecting block is fixed to the other side end of the support frame. Two adjacent spoiler blocks are spliced ​​and combined by inserting the connecting block into the connecting socket.

[0011] In the above-mentioned specific implementation of the protective device for the gooseneck section of the marine riser, the support frame includes a base plate and a vertical plate, the bottom end of the vertical plate is fixed to the base plate, one end of the arc plate is fixedly connected to the vertical plate, and the other end of the arc plate is fixedly connected to the base plate, and the connecting block and the connecting socket are respectively fixed on the two side walls of the base plate.

[0012] In the above specific implementation of the protective device for the gooseneck section of the marine riser, spoiler components are respectively placed along the peripheral parts of the two side walls of the protective cover that are consistent with the length direction of the gooseneck section of the riser.

[0013] In the above specific implementation of the protective device for the gooseneck section of a marine riser, a pressure sensor is fixed to the top end of the protective outer cover.

[0014] In a specific embodiment of the protective device for the gooseneck section of the marine riser, a stabilizing assembly is arranged on the inner side of the protective outer cover, and the stabilizing assembly includes at least one pair of damping rods, each pair of damping rods is respectively located on both sides of the gooseneck section of the riser and is symmetrically distributed, one end of the damping rod is hingedly connected to the side wall of the protective outer cover, and the other end of the damping rod is against the gooseneck section of the riser, and each pair of damping rods clamps the gooseneck of the riser in the middle to generate a damping force thereon.

[0015] In the above-mentioned specific embodiment of the protective device for the gooseneck section of the marine riser, the damping rod includes a rod body, a clamping plate and a spring. One end of the rod body is hingedly connected to the side wall of the protective outer cover, and the interior of the rod body is a hollow structure. The spring is arranged in the rod body and one end of the spring is fixedly connected to the rod body. The other end of the spring extends out of the rod body and is fixedly connected to the clamping plate. The clamping plate is pressed against the side wall of the gooseneck section of the riser under the action of the elastic force of the spring.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The gooseneck section of the riser is covered by a protective cover to protect the structure inside the protective cover, to prevent foreign objects from falling and directly acting on the gooseneck section of the riser to damage it, and to prevent the ocean current from directly scouring the gooseneck section of the riser, thus playing a protective role; in addition, a spoiler component is arranged around the protective cover to change the flow direction of the ocean current and make it flow upward, thereby reducing the sediment scouring effect of the gooseneck section of the riser.

[0018] 2. The pressure sensor built into the protective cover is used for real-time monitoring. When the protective device encounters sudden external force impact, such as falling objects, or suffers potential damage, the pressure sensor can respond immediately, collect relevant data and send it to the smart terminal, providing data support for maintenance decisions, and comprehensively improving the safety level and operation and maintenance efficiency of marine engineering.

[0019] 3. A stabilizing component is arranged inside the protective cover. By connecting the riser gooseneck and the protective cover, the vibration amplitude of the riser gooseneck section can be significantly reduced, thereby enhancing the stability of the overall structure.

[0020] 4. The spoiler assembly is composed of multiple spoiler blocks spliced ​​together and can be easily assembled and disassembled, which not only greatly shortens the on-site construction time and reduces the operating cost, but also provides convenience for subsequent maintenance and recycling and reuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0022] Figure 1 This is a diagram of the installation status of the riser gooseneck section on the seabed;

[0023] Figure 2 It is a schematic diagram of the overall structure of the protective device for the gooseneck section of the marine riser provided by the present invention;

[0024] Figure 3 It is a schematic diagram of the structure inside the protective cover;

[0025] Figure 4 It is a schematic diagram of the structure of the spoiler block;

[0026] Figure 5 It is a structural diagram of the location of the connection socket;

[0027] Figure 6 It is a schematic diagram of the structure of the damping rod.

[0028] List of reference numerals:

[0029] 1. Pile foundation; 2. Gooseneck section of riser; 3. Concrete support platform; 4. Seabed; 5. Protective cover; 6. Spoiler assembly; 601. Arc plate; 602. Water-permeable hole; 603. Connecting block; 604. Support frame, 605. Connecting socket; 7. Stabilizing assembly; 701. Articulated seat; 702. Damping rod; 7021. Rod body; 7022. Spring; 7023. Clamp; 7024. Flexible pad; 8. Pressure sensor. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc., are used to define components, only for the convenience of distinguishing the above components, and unless otherwise stated, the above terms have no special meanings and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The present invention relates to the field of marine engineering technology, and in particular to a protective device for a gooseneck section of a marine riser. The purpose is to solve the following problems existing in the existing riser gooseneck: first, the riser gooseneck is subjected to long-term seawater erosion, which easily forms a scouring pit, causing the riser gooseneck to lose support, and the overall stress state changes, causing pipeline vibration under the continuous scouring of ocean currents, and even fatigue damage; second, the riser gooseneck is close to the bottom of the conductor frame, which has a greater risk of falling objects and is easy to cause third-party damage. To this end, the protective device for the gooseneck section of an ocean riser provided by the present invention includes a protective cover and a spoiler assembly. The protective cover covers the outer side of the gooseneck of the riser to cover it, and the spoiler assembly is arranged on the peripheral part of the outer side of the protective cover. The spoiler assembly is configured to reduce the scouring force of the ocean current on the base of the gooseneck of the riser and the protective cover by changing the flow direction and speed of the ocean current. The gooseneck section of the riser is covered by the protective cover, so as to protect the structure inside the protective cover, avoid the problem of foreign objects falling and directly acting on the gooseneck section of the riser to damage it, and avoid the ocean current directly scouring the gooseneck section of the riser, thereby playing a protective role. In addition, the spoiler assembly is arranged on the periphery of the protective cover, which can change the flow direction of the flowing ocean current to make it flow upward, thereby reducing the sediment scouring effect of the gooseneck section of the riser.

[0034] The protective device for the gooseneck section of a marine riser provided by an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0035] Figure 1 The riser gooseneck section is shown in the installation status diagram on the seabed. The riser is installed on the pile foundation 1. The riser gooseneck section 2 is shown in the figure. The concrete support platform is located below the riser gooseneck section to support the riser. The concrete support platform is installed on the seabed.

[0036] See also Figure 2 The present invention provides a protective device for a gooseneck section 2 of a marine riser, comprising a protective cover 5 and a spoiler assembly 6. The protective cover 5 is covered on the outside of the riser gooseneck to cover it, and the spoiler assembly 6 is arranged on the peripheral part of the outside of the protective cover 5. The spoiler assembly is configured to reduce the scouring force of the ocean current on the base of the riser gooseneck and the protective cover 5 by changing the flow direction and speed of the ocean current.

[0037] Specifically, Figure 2 As shown, the cross-section of the protective cover 5 perpendicular to the riser gooseneck section 2 is an isosceles trapezoid, which ensures the stability of the protective device on the seabed. The top wall thickness of the protective cover 5 is greater than the wall thickness of the two waist-shaped side walls, which is more in line with the stress law of the protective device being impacted by external forces. The top material of the protective cover 5 can be made of glass fiber reinforced plastics and other materials, which have a certain buffering capacity when the external force impacts the protective device. In order to make the protective cover 5 completely cover the riser gooseneck section 2, a notch is opened on the protective cover 5 where the riser gooseneck section 2 passes, so as to achieve the purpose of allowing the riser gooseneck section 2 to pass.

[0038] In one embodiment, see Figure 3 A pressure sensor 8 is fixed at the top of the protective cover 5. The pressure sensor 8 can be connected to the smart terminal by wireless connection, and is used to send the detected data to the smart terminal, realizing the monitoring function of the external force of the pipeline. When the protective device encounters a sudden external force impact, such as a falling object impact, or suffers potential damage, the pressure sensor 8 can respond immediately, collect relevant data and send it to the smart terminal, providing data support for maintenance decisions, and comprehensively improving the safety level and operation and maintenance efficiency of marine engineering. The smart terminal can be a computer device.

[0039] In one embodiment, see Figure 2 and Figure 4 The spoiler assembly 6 includes a plurality of spoiler blocks that can be spliced ​​and assembled along the length direction of the riser gooseneck section 2. The spoiler blocks are provided with an arc structure to change the flow direction of the flowing ocean current so that it flows upward. The spoiler blocks are backed by the protective cover 5 and are in an arc shape, which better conforms to the ocean current gradient of the submarine ocean current and can change the direction of the ocean current so that its direction changes upward.

[0040] In the above embodiments, preferably, refer to Figure 4 The spoiler includes a support frame 604 and a plurality of arc plates 601, and a plurality of water-permeable holes 602 are provided on the arc plates 601. The plurality of arc plates 601 are fixed on the support frame 604 in an inclined manner, and the inclination angle of each arc plate 601 is the same. When the spoiler is placed at the peripheral part of the protective cover 5, the plurality of arc plates 601 are arranged in sequence in a direction gradually approaching the protective cover 5 to change the flow direction of the flowing ocean current so that it flows upward.

[0041] In the above embodiment, the curvature of the curved plate does not exceed π / 2, and the inclination angle of the curved plate is preferably 30° to 60°. Due to the arrangement of the curved plate 601, the flow direction of the ocean current is changed to upward flow through the curved plate 601 during the flow. The combination of the curved plate 601 and the water-permeable hole 602 cleverly changes the direction and intensity of the water flow, reduces the erosion of the ocean current on the base of the riser gooseneck and the protective structure, and prevents the problem of suspension caused by sediment scouring.

[0042] In the above embodiment, preferably, Figure 4 As shown, the diameters of the water-permeable holes 602 on the multiple curved plates 601 are different and decrease in order according to the arrangement sequence of the curved plates 601. The curved plate 601 with the largest diameter water-permeable hole 602 is located at the outermost side, and the water-permeable holes 602 on two adjacent curved plates 601 are arranged in a staggered manner. The attenuation of the ocean current energy by the spoiler is maximized.

[0043] In one embodiment, see Figure 4-5The support frame 604 is a right-angle frame. One end of the arc plate 601 is fixedly connected to a right-angle wall of the support frame 604, and the other end of the arc plate 601 is fixedly connected to another right-angle wall of the support frame 604. A connecting block 603 is fixed to one side end of the support frame 604, and a connecting socket 605 that cooperates with the connecting block 603 is fixed to the other side end of the support frame 604. Two adjacent spoiler blocks are spliced ​​and combined by inserting the connecting block 603 into the connecting socket 605, and the connecting block is inserted into the connecting socket in a clamping state. In order to make each arc plate 601 in an inclined state with the same inclination angle, the width of multiple arc plates 601 gradually decreases in the direction of gradually approaching the support frame 604, such as Figure 4 shown.

[0044] Specifically, the support frame 604 includes a bottom plate and a vertical plate, the vertical plate is vertically fixed on the bottom plate to form a right angle frame, one end of the arc plate 601 is fixedly connected to the vertical plate, and the other end of the arc plate 601 is fixedly connected to the bottom plate. The connecting block 603 and the connecting socket can be fixed on the vertical plate or on the bottom plate. Figure 4 As shown, illustratively, the connection blocks 603 and the connection sockets are fixed on the two side walls of the bottom plate respectively. The number of connection blocks 603 and the connection sockets on each support frame 604 is the same and corresponds one to one. The application does not limit the specific number of connection blocks 603 and connection sockets, which can be flexibly set according to actual usage.

[0045] The material selection for the spoiler needs to have good corrosion resistance and long life, and can maintain the original physical and chemical properties even after long-term immersion in the ocean. For example, it can be stainless steel or fiberglass.

[0046] In addition, it should be noted that the present application does not impose any specific limitation on the number of the arc-shaped plates 601 in the spoiler, and the number can be flexibly adjusted according to the energy of the on-site ocean current.

[0047] In one embodiment, see Figure 2 , spoiler components 6 are respectively placed on the peripheral parts of the two side walls of the protective cover 5 along the length direction of the riser gooseneck section 2. It should be noted that the above is only an example, and the present application does not specifically limit the distribution position of the spoiler components 6 on the outer periphery of the protective cover 5. The spoiler components 6 can also be placed on the four peripheries of the outer side of the protective cover 5.

[0048] In one embodiment, see Figure 3, a stabilizing assembly 7 is provided inside the protective cover 5, and the stabilizing assembly 7 includes at least one pair of damping rods 702, each pair of damping rods includes two damping rods, each pair of damping rods 702 is respectively located on both sides of the riser gooseneck section 2 and is symmetrically distributed, one end of each damping rod 702 is hingedly connected to the side wall of the protective cover 5, and the other end of the damping rod 702 is against the riser gooseneck section 2, and each pair of damping rods 702 clamps the riser gooseneck in the middle to generate a damping force thereon. The application does not make a specific limitation on the number of pairs of damping rods, and it can be flexibly set according to actual conditions, such as three pairs, four pairs, five pairs, or six pairs.

[0049] In the above embodiments, preferably, refer to Figure 6 The damping rod 702 includes a rod body 7021, a clamping plate 7023 and a spring 7022. One end of the rod body 7021 is hingedly connected to the side wall of the protective cover 5. The rod body 7021 is hollow inside. The spring 7022 is arranged inside the rod body 7021 and one end of the spring 7022 is fixedly connected to the rod body 7021. The other end of the spring 7022 extends out of the rod body 7021 and is fixedly connected to the clamping plate 7023. The clamping plate 7023 is against the side wall of the riser gooseneck section 2 under the elastic force of the spring 7022. By setting the spring 7022, its energy absorption and release capabilities are improved, and the amplitude of the riser gooseneck section 2 is effectively suppressed, that is, the vibration amplitude is reduced, and the overall stability and durability of the structure are enhanced.

[0050] Specifically, a flexible pad 7024 is fixed on the end surface of the clamping plate 7023 for contacting the riser gooseneck section 2, in order to significantly reduce the friction coefficient of the contact surface between the damping rod 702 and the riser gooseneck section 2, and avoid possible wear and tear during long-term operation. A hinge seat 701 is fixed on the inner wall of the protective cover 5, and one end of the rod body 7021 is hingedly connected to the hinge seat 701, so that the rod body 7021 can rotate relative to the protective cover 5, which is convenient for adjusting the inclination angle of the damping rod 702 to achieve better vibration reduction.

[0051] In the present application, fiberglass can be selected as the material of the main body of the protective device, which not only gives the device excellent impact resistance and effectively resists the potential threat of falling objects in the ocean, but also ensures the characteristics of lightness and corrosion resistance.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A protective device for a gooseneck section of a marine riser, characterized in that: It includes a protective cover and a spoiler assembly. The protective cover is covered on the outside of the riser gooseneck to cover it. The spoiler assembly is arranged on the peripheral part of the outside of the protective cover. The spoiler assembly is configured to reduce the scouring force of the ocean current on the base of the riser gooseneck and the protective cover by changing the flow direction and speed of the ocean current.

2. The protective device for the gooseneck section of a marine riser according to claim 1, characterized in that: The cross-section of the protective outer cover perpendicular to the gooseneck section of the riser is an isosceles trapezoid, and the thickness of the top wall of the protective outer cover is greater than the thickness of the two waist-shaped side walls.

3. The protective device for the gooseneck section of a marine riser according to claim 1, characterized in that: The spoiler assembly includes a plurality of spoiler blocks that can be spliced ​​and assembled along the length direction of the riser gooseneck section. The surface of the spoiler block facing away from the riser gooseneck section is arc-shaped to change the flow direction of the incoming ocean current to make it flow upward.

4. The protective device for the gooseneck section of a marine riser according to claim 3, characterized in that: The spoiler includes a support frame and a plurality of arc plates, wherein the arc plates are provided with a plurality of water-permeable holes, and the plurality of arc plates are fixed on the support frame in an inclined manner and the inclination angle of each arc plate is the same. When the spoiler is placed at the peripheral part of the protective outer cover, the plurality of arc plates are arranged in sequence in a direction gradually approaching the protective outer cover so as to change the flow direction of the flowing ocean current so that it flows upward.

5. The protective device for the gooseneck section of a marine riser according to claim 4, characterized in that: The diameters of the water holes on the multiple arc plates are different and decrease in sequence according to the arrangement order of the arc plates. The arc plate with the water holes with the largest diameter is located at the outermost side, and the water holes on two adjacent arc plates are arranged in a staggered manner.

6. The protective device for the gooseneck section of a marine riser according to claim 5, characterized in that: The support frame is a right-angle frame, one end of the arc plate is fixedly connected to a right-angle wall of the support frame, and the other end of the arc plate is fixedly connected to another right-angle wall of the support frame. A connecting block is fixed to one side end of the support frame, and a connecting socket that cooperates with the connecting block is fixed to the other side end of the support frame. Two adjacent spoiler blocks are spliced ​​and combined by inserting the connecting block into the connecting socket.

7. The protective device for the gooseneck section of a marine riser according to claim 1, characterized in that: The protective outer cover is provided with spoiler components along the peripheral parts of the two side walls which are consistent with the length direction of the gooseneck section of the riser.

8. The protective device for the gooseneck section of a marine riser according to claim 1, characterized in that: A pressure sensor is fixed on the top end of the protective cover.

9. The protective device for the gooseneck section of a marine riser according to claim 1, characterized in that: A stabilizing component is arranged on the inner side of the protective outer cover, and the stabilizing component includes at least one pair of damping rods, each pair of damping rods is respectively located on both sides of the riser gooseneck section and is symmetrically distributed, one end of the damping rod is hingedly connected to the side wall of the protective outer cover, and the other end of the damping rod is against the riser gooseneck section, and each pair of damping rods clamps the riser gooseneck in the middle to generate a damping force thereon.

10. The protective device for the gooseneck section of a marine riser according to claim 9, characterized in that: The damping rod includes a rod body, a clamping plate and a spring. One end of the rod body is hingedly connected to the side wall of the protective cover. The interior of the rod body is a hollow structure. The spring is arranged in the rod body and one end of the spring is fixedly connected to the rod body. The other end of the spring extends out of the rod body and is fixedly connected to the clamping plate. The clamping plate is pressed against the side wall of the gooseneck section of the riser under the elastic force of the spring.

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