Tilting pad structure of thrust bearing and injection system

Abstract

The invention discloses a thrust bearing tilting pad structure and an injection system, a tilting pad comprises a pad seat and a filling medium, the pad seat comprises a supporting part, an elastic part and a mounting part which are sequentially arranged from bottom to top and are connected with one another, and the elastic part comprises a plurality of hollow pipes which are arranged side by side and are sequentially connected with one another; each hollow tubular structure is filled with the filling medium, the filling medium is formed by mixing a main agent and an auxiliary agent, the main agent has elasticity, and the auxiliary agent has viscidity. The tilting pad has the beneficial effects that when the hollow tubular structure encounters external impact, the filling medium can better buffer and disperse pressure, vibration generated in the working process of the tilting pad is effectively absorbed and attenuated, noise generated in the working process of the tilting pad is reduced, and by changing the preparation proportion of the main agent and the auxiliary agent, the tilting pad can be effectively prevented from falling off. The damping coefficient of the filling medium can be adjusted, and damping adjustability is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of thrust bearings, and particularly relates to a tilting pad structure and an injection system for a thrust bearing. Background Art

[0002] A thrust bearing is a bearing used to bear axial force and is widely used in various products such as ships and water pumps. The tilting pads of existing thrust bearings (such as a water-lubricated thrust bearing and its performance testing method disclosed in Patent Application No. 202410696716.3) include a support layer, a hollow elastic layer, a pad seat, a lining layer, and a wear-resistant pad surface layer arranged in sequence from bottom to top. The hollow elastic layer includes a plurality of hollow tubular structures that are radially penetrated and connected in sequence. The hollow elastic layer can effectively improve the elasticity of the tilting pad. However, since the medium in the hollow space is air, it cannot effectively absorb and convert vibration energy, resulting in poor vibration reduction and noise reduction effects of the hollow elastic layer. In addition, under different temperatures, pressures, or loads, the compressibility and instability of air will change, which will also affect the vibration reduction effect of the hollow elastic layer. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above technical deficiencies, and propose a tilting pad structure and an injection system for a thrust bearing to solve the technical problem of poor vibration reduction and noise reduction effects of the hollow elastic layer of the tilting pad in the prior art.

[0004] To achieve the above technical purpose, the technical solution of the present invention provides a tilting pad structure for a thrust bearing, including: A pad seat, which includes a support part, an elastic part, and an installation part that are arranged in sequence from bottom to top and are connected to each other. The elastic part includes a plurality of hollow tubes arranged side by side and connected in sequence; A filling medium, which is used to fill each of the hollow tubular structures. The filling medium is formed by mixing a main agent and a secondary agent. The main agent has elasticity, and the secondary agent has viscosity.

[0005] Further, when the filling medium has low damping, the weight ratio of the main agent to the secondary agent is 100:(3 - 10), and the damping coefficient η of the filling medium is 0.10 - 0.30.

[0006] Further, when the filling medium has medium damping, the weight ratio of the main agent to the secondary agent is 100:(10 - 20), and the damping coefficient η of the filling medium is 0.30 - 0.45.

[0007] Further, when the filling medium has high damping, the weight ratio of the main agent to the secondary agent is 100:(20 - 30), and the damping coefficient η of the filling medium is 0.45 - 0.75.

[0008] Further, the main agent is made of RTV rubber material.

[0009] Further, the auxiliary agent is made of a resin-based tackifier material.

[0010] Further, the tilting pad structure of the thrust bearing further includes a seal, which is coated on the outer side wall of the elastic part for sealing the pipe orifice at one end of each hollow tubular structure.

[0011] Further, the cross-section of the elastic part is a trapezoidal structure, and the seal is an n-shaped structure and is bonded to the two waist sides and the short side of the elastic part.

[0012] Further, a first filling area is formed between adjacent hollow tubular structures, a second filling area is formed between the seal and the hollow tubular structure, and the filling medium is also used to fill each first filling area and each second filling area.

[0013] On the other hand, the present invention also provides an injection system, including the above-mentioned tilting pad structure of the thrust bearing, a storage unit, a fixing unit, a mixing and degassing unit, an injection unit, a pressure unit and a monitoring unit. The storage unit is used to store the filling medium, the fixing unit is used to fix the tilting pad seat, the mixing and degassing unit is connected to the fixing unit to mix and stir the filling medium and degas the filling medium, the injection unit is connected to the fixing unit to inject the filling medium into each hollow tubular structure, the pressure unit is connected to the fixing unit to provide filling pressure, and the monitoring unit is used to monitor the injection rate, injection pressure and filling state and adjust the injection parameters in real time.

[0014] Compared with the prior art, the beneficial effects of the present invention include: filling the filling medium into each hollow tube. Since the auxiliary agent has viscosity, the filling medium can be connected with the hollow tube as a whole. Since the main agent has elasticity, the filling medium can evenly provide damping in the hollow tube. When the hollow tube encounters external impact, the filling medium can better buffer and disperse the pressure, effectively absorb and attenuate the vibration generated during the operation of the tilting pad, and reduce the noise generated during the operation of the tilting pad, so as to avoid the transmission of the impact force to other components or areas, reduce the risk of tilting pad damage, extend the service life of the tilting pad, and is suitable for occasions with high load and long-term operation. After testing, after filling the filling medium into each hollow tube, the vibration attenuation rate of the tilting pad is increased by 33%, the resonance risk is significantly reduced, the noise is reduced by 15 dB, and the noise reduction effect is significant. The ultimate load is increased by 22.6%, and the bearing capacity is significantly enhanced. By changing the mixing ratio of the main agent and the auxiliary agent, the damping coefficient of the filling medium can be adjusted to achieve adjustable damping. Description of the Drawings

[0015] Figure 1 This is a three-dimensional structural schematic diagram of a tilting pad structure of a thrust bearing provided by the present invention; Figure 2 This is a three-dimensional structural schematic diagram of a tilting pad structure of a thrust bearing provided by the present invention from another perspective; Figure 3 This is a three-dimensional structural schematic diagram of the connection relationship between the elastic part and the filling medium in a tilting pad structure of a thrust bearing provided by the present invention; Figure 4 This is a three-dimensional structural schematic diagram of a seal in a tilting pad structure of a thrust bearing provided by the present invention; Figure 5 This is a structural schematic diagram of an injection system provided by the present invention; In the figure: 100 - tilting pad seat, 110 - supporting part, 111 - first accommodating groove, 112 - mounting hole, 120 - elastic part, 121 - hollow tube, 130 - mounting part, 131 - second accommodating groove, 140 - rigid ball head, 150 - lining bottom part, 160 - tilting pad surface part, 200 - filling medium, 300 - seal, 400 - storage unit, 500 - fixing unit, 600 - mixing and degassing unit, 700 - injection unit, 800 - pressure unit, 900 - monitoring unit. Detailed implementation manners

[0016] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0017] The present invention provides a tilting pad structure of a thrust bearing, and its structure is as shown in Figure 1 - Figure 3 and includes a tilting pad seat 100 and a filling medium 200. The tilting pad seat 100 includes a supporting part 110, an elastic part 120 and a mounting part 130 which are arranged in sequence from bottom to top and are connected to each other. The elastic part 120 includes a plurality of hollow tubes 121 arranged side by side and connected in sequence; the filling medium 200 is used to fill each of the hollow tubes 121. The filling medium 200 is formed by mixing a main agent and a secondary agent. The main agent has elasticity and the secondary agent has viscosity. The ratio of the main agent to the secondary agent is different, and the damping coefficient of the filling medium 200 is different.

[0018] Fill the filling medium 200 into each of the hollow tubes 121. Since the secondary agent has viscosity, it can connect the filling medium 200 and the hollow tube 121 into a whole. Since the primary agent has elasticity, it can uniformly provide damping for the filling medium 200 in the hollow tube 121. When the hollow tube 121 encounters an external impact, the filling medium 200 can better buffer and disperse the pressure, effectively absorb and attenuate the vibration generated during the operation of the tilting pad, and reduce the noise generated during the operation of the tilting pad. Thus, the impact force can be prevented from being transmitted to other components or areas, the risk of tilting pad damage can be reduced, the service life of the tilting pad can be extended, and it is applicable to occasions with high load and long-term operation. Filling the filling medium 200 into each of the hollow tubes 121 can also increase the overall rigidity of the tilting pad, prevent the tilting pad from deforming or being unevenly stressed due to the voids existing in each of the hollow tubes 121, and can eliminate these voids, thereby avoiding resonance phenomena and enhancing the stability of the tilting pad. After testing, after filling the filling medium 200 into each of the hollow tubes 121, the vibration attenuation rate of the tilting pad is increased by 33%, the resonance risk is significantly reduced, the noise is reduced by 15 dB, and the noise reduction effect is significant. The ultimate load is increased by 22.6%, and the load-bearing capacity is significantly enhanced. By changing the formulation ratio of the primary agent and the secondary agent, the damping coefficient of the filling medium 200 can be adjusted to achieve adjustable damping.

[0019] As a preferred embodiment, please refer to Figure 1 and Figure 2 , the pad seat 100 further includes a rigid ball head 140, a lining bottom 150 and a pad face 160. The rigid ball head 140 is connected to the bottom of the support portion 110, the lining bottom 150 is connected to the top of the mounting portion 130, the pad face 160 is connected to the top of the lining bottom 150, and the pad face 160 is used to contact the fixed pad of the thrust bearing to form a friction surface.

[0020] As a preferred embodiment, please refer to Figure 2 , a first receiving groove 111 with an open bottom surface is formed in the bottom of the support portion 110. The upper end of the rigid ball head 140 is disposed in the first receiving groove 111, and the lower end of the rigid ball head 140 extends out of the first receiving groove 111. The bottom of the rigid ball head 140 is used to contact the grating fiber optic force measuring device of the thrust bearing.

[0021] As a preferred embodiment, please refer to Figure 1 and Figure 2 , a mounting hole 112 is formed in the side wall of the support portion 110. A pin shaft is inserted into the mounting hole 112 and is rotatably connected to the support ring of the thrust bearing through the pin shaft, so that the tilting pad can swing in a plane.

[0022] As a preferred embodiment, please refer to Figure 1 , a second receiving groove 131 with an open top surface is formed at the top of the installation part 130, and the lining bottom part 150 is arranged in the second receiving groove 131, which is convenient for installing the lining bottom part 150.

[0023] As a preferred embodiment, when the filling medium 200 has low damping, the weight ratio of the main agent to the auxiliary agent is 100:(3 - 10), the damping coefficient η of the filling medium is 0.10 - 0.30. The low content of the auxiliary agent can keep the filling medium 200 with high elasticity, the elastic retention rate ≥ 90%, and the deformation recovery is fast, but the vibration attenuation period is long. It is applicable to light load scenarios that require flexible buffering. The damping coefficient of the filling medium 200 is low, the vibration attenuation speed is slow, but the deformation recovery performance is excellent.

[0024] As a preferred embodiment, when the filling medium 200 has medium damping, the weight ratio of the main agent to the auxiliary agent is 100:(10 - 20), the damping coefficient η of the filling medium 200 is 0.30 - 0.45, and the elastic retention rate ≥ 80%). It can absorb medium and high frequency vibration energy and reduce the noise by 3 - 5 dB. The medium content of the auxiliary agent can make the filling medium 200 balance elasticity and viscosity. It is applicable to medium load and conventional vibration environments. The damping coefficient of the filling medium 200 is moderate, and it can effectively absorb medium and high frequency vibration energy and reduce the noise.

[0025] As a preferred embodiment, when the filling medium 200 has high damping, the weight ratio of the main agent to the auxiliary agent is 100:(20 - 30), the damping coefficient η of the filling medium 200 is 0.45 - 0.75, and the elastic retention rate drops to 60 - 70%. However, the vibration attenuation speed increases by more than 50%. The high content of the auxiliary agent can keep the filling medium 200 with high viscosity and internal friction. It is applicable to heavy load and strong impact working conditions. The damping coefficient of the filling medium 200 is high, the vibration attenuation speed is fast, but the elasticity decreases slightly. It is necessary to balance the anti-fatigue performance to avoid material aging caused by long-term high-frequency impact. The damping coefficient test standard of the filling medium 200 is ASTM D5992 and the frequency is 10 Hz.

[0026] As a preferred embodiment, the main agent is made of RTV rubber material, which is liquid in the initial state and can be cured at room temperature. RTV silicone has excellent elasticity and flexibility, can effectively absorb external impact and vibration, and convert vibration energy into heat, thereby reducing vibration and noise. Its damping characteristics are very outstanding, and can reduce mechanical vibrations caused by high-speed operation or strenuous exercise. Especially in complex hollow structures, RTV silicone filling can provide a uniform damping effect and improve the stability of the equipment. RTV silicone can remain stable in high temperature environments, and its temperature resistance range is usually -60°C-200°C, making it suitable for environments that need to withstand high temperatures. Even at extreme temperatures, RTV silicone can still maintain its physical properties and elasticity, and is not easy to deform or age. For equipment that needs to be used in environments with large temperature fluctuations, RTV silicone filling provides long-term thermal stability.

[0027] As a preferred embodiment, the auxiliary agent is a resin-based tackifier material, which can enable the filling medium 200 to be firmly adsorbed on the hollow tube 121 after solidification.

[0028] As a preferred embodiment, please refer to Figure 1 and Figure 2 The thrust bearing tilting pad structure further includes a seal 300, which is coated on the outer wall of the elastic portion 120 and is used to seal the pipe opening at one end of each of the hollow tubes 121. Before the filling medium 200 is filled into each of the hollow tubes 121, the pipe opening at the other end of each of the hollow tubes 121 is made to face upward. The seal 300 can effectively seal the pipe opening at one end of each of the hollow tubes 121 to prevent the liquid filling medium 200 from leaking from the pipe opening at one end of each of the hollow tubes 121 due to its strong fluidity during the filling process, thereby ensuring the integrity of the filling effect.

[0029] As a preferred embodiment, please refer to Figure 3 and Figure 4, the cross-section of the elastic part 120 is a trapezoidal structure. The seal 300 is an N-shaped structure and is bonded to the two waist sides and the short side of the elastic part 120. Using the seal 300 to seal the pipe orifice at one end of each hollow tube 121 can effectively seal the pipe orifice at one end of each hollow tube 121, preventing the liquid filling medium 200 from leaking from the pipe orifice at one end of each hollow tube 121 during the filling process due to its strong fluidity. This not only saves materials but also ensures the integrity of the filling effect. The seal 300 can prevent the problem of uneven flow of the filling medium 200 caused by the external environment, thereby ensuring that each gap of each hollow tube 121 can be evenly filled. The seal 300 can effectively seal the pipe orifice at one end of each hollow tube 121 to form a closed environment, thereby defining the filling space of the filling medium 200, making the operation more accurate, avoiding unnecessary cleaning work, and thus simplifying the process flow. By preventing the overflow of the filling medium 200, the need for operators to perform edge trimming or multiple filling after filling is reduced.

[0030] As a preferred embodiment, the seal 300 is made of heat-resistant silicone material and can work in a high-temperature environment for a long time. It can usually withstand temperatures above 200°C and has better heat-resistant deformation ability. Even when exposed to a high-temperature environment for a long time, it will not soften, melt or deform like traditional materials. Temperature changes can cause many materials to expand or contract. The seal 300 can maintain stable performance at different temperatures and is not easily leaked due to temperature fluctuations, ensuring the sealing effect when filling the filling medium 200. The seal 300 has good elasticity and is suitable for demoulding. For some complex parts, the softness of the seal 300 makes demoulding easy without damaging the finished product.

[0031] As a preferred embodiment, please refer to Figure 1 and Figure 2 , a first filling area is formed between adjacent hollow tubes 121, and a second filling area is formed between the seal 300 and the hollow tube 121. The filling medium 200 is also used to fill each of the first filling areas and each of the second filling areas, so as to further effectively absorb and attenuate the vibration generated during the operation of the tilting pad and reduce the noise generated during the operation of the tilting pad.

[0032] As a preferred embodiment, a demoulding agent is applied at the contact between the seal 300 and the filling medium 200. When the filling medium 200 is cured, it is convenient to remove the seal 300 and prevent the seal 300 from adhering to the filling medium 200.

[0033] Please refer to Figure 5, based on the above-described tilting pad structure of the thrust bearing, the present invention further provides an injection system, including the above-described tilting pad structure of the thrust bearing, a storage unit 400, a fixing unit 500, a mixing and degassing unit 600, an injection unit 700, a pressure unit 800, and a monitoring unit 900. The storage unit 400 is used to store the filling medium 200. The fixing unit 500 is used to fix the pad seat 100. The mixing and degassing unit 600 is used to mix and stir the filling medium 200 and perform degassing treatment on the filling medium 200. The injection unit 700 is used to inject the filling medium 200 into each hollow tube 121. The pressure unit 800 is used to provide filling pressure. The monitoring unit 900 is used to monitor the injection rate, injection pressure, and filling state, and adjust the injection parameters in real time to ensure the filling quality, avoid bubbles or material waste. Place the pad seat 100 vertically on the fixing unit 500 and make the orifices at the other ends of the hollow tubes 121 face upward. The injection unit 700 injects the filling medium 200 from the bottom of each hollow tube 121, which can ensure that the filling medium 200 is more uniform during the process of filling the entire hollow tube 121. Since the pressure is applied from the bottom of each hollow tube 121, the filling medium 200 can smoothly fill each void, avoiding the situation of bubble aggregation or uneven filling that may occur when injecting the filling medium 200 from the top of each hollow tube 121 first. Bottom injection makes the flow of silicone during the filling process more precise, avoids waste of excess material, and reduces the accumulation of silicone overflowing from the top. In this way, the surface of the final product can be kept clean, reducing the workload of subsequent trimming and cleaning. The pressure unit 800 can provide stable pressure during the entire filling process to ensure the controllability of the filling process, which is particularly important for structures with complex shapes and high dimensional requirements, avoiding the errors and inconsistencies of traditional manual filling methods. Since in a complex hollow structure, the edge part of the filling medium 200 is prone to problems such as poor adhesion due to stress concentration or insufficient filling, adding the auxiliary agent can change the chemical properties of the main agent, so that the mixed filling medium 200 can better bond with the metal surface, improving the adhesion strength between the filling medium 200 and the substrate after curing. After adding the auxiliary agent, the main agent can fit more firmly to the edge part. The mixing and degassing unit 600 is used to mix and stir the filling medium 200 and perform degassing treatment on the filling medium 200. The bubbles in the filling medium 200 are effectively removed, avoiding the formation of holes after injection and curing, thereby improving the density and integrity of the filling. The auxiliary agent makes the main agent form a more uniform surface during the curing process, reducing the phenomenon of sticking to the mold caused by uneven surface. In cooperation with the degassing treatment, the residual bubbles in the filling medium 200 are effectively removed, avoiding material tearing or surface damage caused by holes during demolding.During injection, the monitoring unit 900 is used to monitor the key parameters in the injection process in real time, and the operation is optimized through a feedback mechanism. The injection pressure, flow rate, filling state, etc. are monitored, and real-time feedback is provided to the control system to adjust the injection parameters, ensure the filling quality, and avoid bubbles or material waste.

[0034] To better understand the present invention, the following Figure 1 - Figure 5 will be used to describe in detail the working principle of the technical solution of the present invention: The tile seat 100 is vertically placed on the fixing unit 500, and the nozzles at the other ends of the hollow tubes 121 face upward. The injection unit 700 injects the filling medium 200 from the bottom of each hollow tube 121, so that each hollow tube 121 is filled with the filling medium 200. Because the auxiliary agent is viscous, the filling medium 200 can be connected to the hollow tube 121 as a whole. Because the main agent is elastic, the filling medium 200 can uniformly provide damping in the hollow tube 121. When the hollow tube 121 encounters an external impact, the filling medium 200 can better buffer and disperse the pressure, effectively absorb and attenuate the vibration generated during the operation of the tilting pad, and reduce the noise generated during the operation of the tilting pad. Thus, the impact force can be prevented from being transmitted to other components or areas, the risk of tilting pad damage can be reduced, the service life of the tilting pad can be extended, and it is applicable to occasions with high load and long-term operation. Filling the filling medium 200 into each hollow tube 121 can also increase the overall rigidity of the tilting pad, avoid deformation or uneven stress of the tilting pad caused by the voids in each hollow tube 121, and eliminate these voids, thereby avoiding resonance phenomena and enhancing the stability of the tilting pad. After testing, after filling the filling medium 200 into each hollow tube 121, the vibration attenuation rate of the tilting pad is increased by 33%, the resonance risk is significantly reduced, the noise is reduced by 15 dB, the noise reduction effect is significant, and the ultimate load is increased by 22.6%, and the bearing capacity is significantly enhanced. By changing the mixing ratio of the main agent and the auxiliary agent, the damping coefficient of the filling medium 200 can be adjusted to achieve adjustable damping.

[0035] A tilting pad structure and injection system provided by the present invention have the following beneficial effects: (1) Using the seal 300 to seal the nozzles at one end of each hollow tube 121 can effectively seal the nozzles at one end of each hollow tube 121, preventing the liquid filling medium 200 from leaking from the nozzles at one end of each hollow tube 121 due to its strong fluidity during the filling process. This not only saves materials but also ensures the integrity of the filling effect; (2)The mixing and degassing unit 600 is used to mix and stir the filling medium 200 and degas the filling medium 200. Bubbles in the filling medium 200 are effectively removed, avoiding the formation of holes after injection and curing, thereby improving the density and integrity of the filling. (3)When the hollow tube 121 encounters an external impact, the filling medium 200 can better buffer and disperse the pressure, effectively absorb and attenuate the vibration generated by the tilting pad during operation, and reduce the noise generated by the tilting pad during operation. By changing the formulation ratio of the main agent and the auxiliary agent, the damping coefficient of the filling medium 200 can be adjusted to achieve adjustable damping.

[0036] The specific embodiments of the present invention described above do not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and deformations made according to the technical concept of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A thrust bearing tilting pad structure, characterized in that: include: The tile seat comprises a supporting part, an elastic part and a mounting part which are sequentially arranged and connected to each other from bottom to top, wherein the elastic part comprises a plurality of hollow tubes which are arranged side by side and sequentially connected; The filling medium is used to fill each of the hollow tubular structures. The filling medium is formed by mixing a main agent and an auxiliary agent. The main agent has elasticity, and the auxiliary agent has viscosity.

2. The thrust bearing tilting pad structure according to claim 1, characterized in that: When the filling medium is low damping, the weight ratio of the main agent to the auxiliary agent is 100:(3-10), and the damping coefficient η of the filling medium is 0.10-0.

30.

3. The thrust bearing tilting pad structure according to claim 1, characterized in that: When the filling medium has medium damping, the weight ratio of the main agent to the auxiliary agent is 100:(10-20), and the damping coefficient η of the filling medium is 0.30-0.

45.

4. The thrust bearing tilting pad structure according to claim 1, characterized in that: When the filling medium is high damping, the weight ratio of the main agent to the auxiliary agent is 100:(20-30), and the damping coefficient η of the filling medium is 0.45-0.

75.

5. The thrust bearing tilting pad structure according to claim 1, characterized in that: The main agent is made of RTV rubber.

6. The thrust bearing tilting pad structure according to claim 1, characterized in that: The auxiliary agent is made of a resinous tackifier material.

7. The thrust bearing tilting pad structure according to claim 1, characterized in that: It also includes a sealing member, which is coated on the outer side wall of the elastic portion and is used to seal the pipe opening at one end of each hollow tubular structure.

8. The thrust bearing tilting pad structure according to claim 7, characterized in that: The cross section of the elastic part is a trapezoidal structure, and the sealing member is an n-shaped structure and is bonded to the two waist sides and the short sides of the elastic part.

9. The thrust bearing tilting pad structure according to claim 8, characterized in that: A first filling region is formed between adjacent hollow tubular structures, and a second filling region is formed between the sealing member and the hollow tubular structure. The filling medium is also used to fill each of the first filling regions and each of the second filling regions.

10. An injection system, characterized in that: It comprises a thrust bearing tilting pad structure as described in any one of claims 1 to 9, a storage unit, a fixing unit, a mixing and degassing unit, an injection unit, a pressure unit and a monitoring unit, wherein the storage unit is used to store the filling medium, the fixing unit is used to fix the pad seat, the mixing and degassing unit is connected to the fixing unit to mix and stir the filling medium and degas the filling medium, the injection unit is connected to the fixing unit to inject the filling medium into each hollow tubular structure, the pressure unit is connected to the fixing unit to provide filling pressure, and the monitoring unit is used to monitor the injection rate, injection pressure and filling status, and adjust the injection parameters in real time.

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