Novel high-temperature and high-pressure resistant oil return hose

Abstract

The utility model relates to oil return hose technical field especially relates to novel high temperature and high pressure oil return hose, including first pipe body and second pipe body, first pipe body and second pipe body all adopt the long filament aramid line weaving of impregnation and twist, and the end of first pipe body and second pipe body butt joint intercommunication, and the butt joint end between first pipe body and second pipe body is provided with sealing washer, and the side of sealing washer close to first pipe body is provided with the embedded ring of wall thickness gradually thin, and the outside of first pipe body is provided with the sealing groove of embedded ring adaptation, and first connecting mechanism is connected in the outside of first pipe body and second pipe body butt joint end, and the butt joint pipeline is set up in the one end of first pipe body away from second pipe body, and butt joint pipeline and first pipe body butt joint intercommunication, the utility model discloses through first connecting mechanism and second connecting mechanism can greatly shorten hose dismounting time, reduce the length of time of equipment because of maintenance downtime, improve the continuity and overall efficiency of industrial production.

Description

Technical Field

[0001] This utility model relates to the field of oil return hose technology, and in particular to a novel high-temperature and high-pressure resistant oil return hose. Background Technology

[0002] In the industrial field, return hoses are core components of hydraulic systems and power transmission systems, undertaking the key functions of media transportation and pressure transmission. Their performance stability directly affects the operational safety and service life of the entire equipment. Especially in special working conditions such as dump trucks, higher requirements are placed on the durability of return hoses.

[0003] Traditional return hoses also have significant defects in structural design and connection methods. Connections between hoses and pipelines, and between hoses themselves, often rely on simple flange bolts or clamps, resulting in poor sealing performance and inconvenient assembly and disassembly. Bolt connections require specialized tools for individual tightening, leading to low assembly efficiency, and long-term vibration can cause bolts to loosen, damaging the sealing structure and causing leaks. Clamp fixation, on the other hand, struggles to guarantee uniform clamping force, and sealing reliability is heavily influenced by operator experience, failing to meet long-term sealing requirements under high pressure and high temperature conditions. Therefore, this application proposes a novel high-temperature and high-pressure resistant return hose. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a new type of high temperature and high pressure resistant return oil hose to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a novel high-temperature and high-pressure resistant oil return hose, comprising: The first tube and the second tube are both made of woven aramid yarn with dipped and twisted filaments. The ends of the first tube and the second tube are connected. A sealing gasket is provided between the joint ends of the first tube and the second tube. A fitting ring with gradually thinning wall thickness is provided on the side of the sealing gasket near the first tube. A sealing groove that matches the fitting ring is opened on the outside of the first tube. The first connecting mechanism is sleeved and connected to the outside of the joint end between the first pipe body and the second pipe body; The connecting pipeline is located at the end of the first pipe body away from the second pipe body, and the connecting pipeline is connected to the first pipe body. The second connecting mechanism is sleeved and connected to the outside of the connection end between the first pipe body and the connecting pipeline.

[0006] Optionally, the first connecting mechanism includes a first protective tube, a second protective tube, a first sleeve, a collar, and an anti-detachment component. The first protective tube is fixedly sleeved on the end of the first tube body, and the second protective tube is fixedly sleeved on the end of the second tube body. An integral flange end is provided at the joint end of the first tube body and the second tube body. The outer wall of the first protective tube is flush with the flange end of the first tube body. The first sleeve is sleeved at the joint end of the first tube body and the second tube body, and the inner wall of the first sleeve is threaded to the outer wall of the first protective tube. An annular groove is opened at the end of the outer wall of the first protective tube away from the second tube body. The collar is sleeved in the annular groove, and a first spring is connected between the side of the collar away from the second tube body and the inner wall of the annular groove. Two sets of anti-detachment components are provided, and the two anti-detachment components are respectively located at the top and bottom of the inner wall of the open end of the first sleeve.

[0007] Optionally, the anti-detachment component includes a locking block and a second spring. The top and bottom of the inner wall of the opening end of the first sleeve are provided with inner grooves. The locking block is located in the inner groove. The second spring is fixedly connected between the locking block and the inner groove. One end of the locking block can extend out of the inner groove and extend into the annular groove on the outer wall of the first protective tube. The two corners of the end of the locking block extending out of the inner groove are both set as inclined surface one. The outer ring of the collar near the locking block is set as inclined surface two. The collar can move into the first sleeve and squeeze the inclined surface one on the bottom side of the locking block.

[0008] Optionally, the second connecting mechanism includes a second sleeve and a locking assembly. The outer wall of the connecting pipe end is sequentially provided with threads and an annular groove. The second sleeve is sleeved on the end of the first pipe body away from the second pipe body, and the inner wall of the second sleeve is threadedly connected to the threaded part of the outer wall of the connecting pipe. Notches are provided at the top and bottom of the opening end of the second sleeve. Two sets of locking assemblies are provided and installed in the two notches respectively, and both locking assemblies are engaged with the annular groove on the outside of the connecting pipe.

[0009] Optionally, the locking assembly includes a flip plate, a second fixed shaft, a limiting plate, and a fourth spring. The inner end of the notch is equipped with a first fixed shaft. The flip plate is rotatably sleeved on the first fixed shaft, and when the flip plate is in a horizontal state, its outer wall is flush with the outside of the second sleeve. A groove is provided at the bottom of the flip plate, and the second fixed shaft is installed at the inner end of the groove. The limiting plate is L-shaped, with one end of the limiting plate hinged to the second fixed shaft and the other end of the limiting plate facing the connecting pipe. The other end of the limiting plate is toothed and engages with the annular groove on the connecting pipe. The fourth spring is fixedly connected between the bottom of the limiting plate and the inner wall of the groove.

[0010] Optionally, the outer wall of the opening end of the second sleeve is provided with an outer edge, and a fixing ring is fixedly sleeved at the other end of the second sleeve. A compression ring is sleeved outside the second sleeve and between the fixing ring and the outer edge. A third spring is connected between the compression ring and the fixing ring. Under normal conditions, the compression ring is located at the notch at the opening end of the second sleeve, and the inner wall of the compression ring is in contact with the outer wall of the flip plate.

[0011] The beneficial effects of this utility model are: A sealing gasket is provided at the joint end of the first pipe body and the second pipe body, and a fitting ring with gradually thinning wall thickness is provided on one side of the sealing gasket, which is precisely matched with the sealing groove on the outside of the first pipe body to form a double sealing structure of "fitting + fitting". Compared with the traditional simple flange or clamp connection, the sealing area is larger and the fit is tighter, effectively preventing high pressure medium from leaking from the joint gap, and adapting to the long-term sealing requirements under high temperature and high pressure conditions.

[0012] The foundation is fixed by the threaded connection between the first sleeve and the first protective pipe. At the same time, the locking block of the anti-loosening component engages with the annular groove, and the elastic limit of the collar and the first spring forms a triple anti-loosening guarantee of "thread + engagement + elastic buffer". This avoids loosening of the connection due to equipment vibration. Even under long-term bumpy and vibrating conditions (such as during the driving of a dump truck), the pipe body can maintain stable connection. The connecting pipe and the first pipe body are connected by the threaded connection of the second sleeve. With the toothed limit plate of the locking component engaging with the annular groove, and the compression ring and the third spring pressing and fixing the flipping plate, a multi-locking structure of "threaded fastening + toothed locking + elastic compression" is formed. This not only makes disassembly and assembly convenient (without tightening each bolt individually), but also avoids problems such as uneven clamping force and loose bolts in traditional clamps, improving connection reliability and assembly efficiency. Attached Figure Description

[0013] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the connection between the first tube and the second tube of this utility model; Figure 3 This is a cross-sectional structural diagram of the connection between the first tube body and the second tube body of this utility model; Figure 4 This utility model Figure 3 Enlarged structural diagram at point A; Figure 5 This is a schematic diagram of the connection between the first tube body and the first protective tube of this utility model; Figure 6 This is a schematic diagram of the connection between the first pipe body and the connecting pipe of this utility model; Figure 7 This is a cross-sectional structural diagram of the connection between the first pipe body and the connecting pipe of this utility model; Figure 8 This is a schematic diagram of the annular groove on the connecting pipe of this utility model; Figure 9 This is a cross-sectional structural diagram of the second connecting mechanism of this utility model; Figure 10 This utility model Figure 9 Enlarged structural diagram at point B; In the picture: 1. First pipe body; 2. Second pipe body; 3. Connecting pipeline; 4. First connecting mechanism; 5. Second connecting mechanism; 12. Sealing gasket; 13. Sealing groove; 31. Circular slot; 41. First protective tube; 42. Second protective tube; 43. First sleeve; 44. Collar; 45. First spring; 46. Locking block; 47. Second spring; 411. Annular groove; 51. Second sleeve; 52. Locking assembly; 53. Retaining ring; 54. Compression ring; 55. Third spring; 511. Notch; 512. First fixed shaft; 521. Flip plate; 522. Groove; 523. Second fixed shaft; 524. Limiting plate; 525. Fourth spring. Detailed Implementation

[0014] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0015] Please see Figures 1-10This utility model provides a technical solution: a novel high-temperature and high-pressure resistant return oil hose, comprising a first pipe body 1 and a second pipe body 2. Both the first pipe body 1 and the second pipe body 2 are braided from rubber-impregnated and twisted aramid yarn. While ensuring the lightweight of the pipe body, it significantly improves the burst pressure, making it suitable for high-pressure media transportation scenarios such as hydraulic systems and power transmission systems. It reduces the risk of pipe bulging and bursting due to excessive pressure, ensuring the safety of equipment operation. It is especially suitable for core transmission links in industrial fields where pressure stability is critical. A heating wire is installed inside the pipe body, and the heating wire has… The characteristic of "higher temperature, higher resistance, lower heat power" automatically avoids damage to the hose body caused by localized overheating. It also supports flexible resistance adjustment based on the actual hose length, eliminating the need for custom-made heating elements for different hose specifications and reducing adaptation costs. Furthermore, both the first hose body 1 and the second hose body 2 use imported acrylic rubber as the inner lining, and through a proprietary formula design, significantly improve their high-temperature resistance to hot oil. Compared to conventional NBR material (maximum withstand temperature 125℃), it can stably cope with high-temperature environments, preventing oil leakage due to long-term high-temperature aging and cracking, thus extending the hose's service life. To reduce equipment maintenance frequency and costs, the ends of the first pipe body 1 and the second pipe body 2 are connected. A sealing gasket 12 is provided between the connecting ends of the first pipe body 1 and the second pipe body 2. A fitting ring with gradually thinning wall thickness is provided on the side of the sealing gasket 12 near the first pipe body 1, and a sealing groove 13 adapted to the fitting ring is opened on the outside of the first pipe body 1. A first connecting mechanism 4 is sleeved and connected to the outside of the connecting ends of the first pipe body 1 and the second pipe body 2. A connecting pipe 3 is located at the end of the first pipe body 1 away from the second pipe body 2, and the connecting pipe 3 is connected to the first pipe body 1. A second connecting mechanism... Five sets are installed on the outside of the joint between the first pipe body 1 and the connecting pipe 3. The joint between the first pipe body 1 and the second pipe body 2 is equipped with a sealing gasket 12 with a gradually changing wall thickness fitting ring. The fitting ring is precisely matched with the sealing groove 13 of the first pipe body 1 to form a double seal of "fitting + fitting". Compared with the traditional simple flange or clamp connection, the sealing area is larger and the fit is tighter, blocking the leakage of high pressure medium from the source. At the same time, it is combined with the first connecting mechanism 4 and the second connecting mechanism 5 to lay the foundation for convenient disassembly and assembly and stable connection. The overall structure takes into account the core requirements of high temperature and high pressure resistance and sealing reliability.

[0016] like Figures 2-5As shown, the first connecting mechanism 4 includes a first protective tube 41, a second protective tube 42, a first sleeve 43, a collar 44, and an anti-detachment component. The first protective tube 41 is fixedly sleeved on the end of the first tube body 1, and the second protective tube 42 is fixedly sleeved on the end of the second tube body 2. An integral flange is provided at the joint end of both the first tube body 1 and the second tube body 2. The outer wall of the first protective tube 41 is flush with the flange end of the first tube body 1. The first sleeve 43 is sleeved at the joint end of the first tube body 1 and the second tube body 2, and the inner wall of the first sleeve 43 is threaded to the outer wall of the first protective tube 41. An annular groove 411 is formed on the outer wall of the first protective tube 41 at the end away from the second tube body 2. The collar 44 is sleeved in the annular groove 411, and a first spring 45 is connected between the side of the collar 44 away from the second tube body 2 and the inner wall of the annular groove 411. Two sets of anti-detachment components are provided, and the two anti-detachment components are respectively located at the top and bottom of the inner wall of the open end of the first sleeve 43. The multi-layered protective structure solves the problems of easy loosening and cumbersome disassembly and assembly in traditional connections. On the one hand, the first protective tube 41 and the second protective tube 42 are fixed to the ends of the first tube body 1 and the second tube body 2 respectively. With the threaded connection between the first sleeve 43 and the first protective tube 41, the connection between the first tube body 1 and the second tube body 2 is firmly fixed. The first protective tube 41 and the second protective tube 42 can also protect the ends of the first tube body 1 and the second tube body 2, preventing damage to the connection point due to external forces. On the other hand, an innovative addition of annular groove 411, collar 44, first spring 45 and anti-detachment components are added. The two sets of anti-detachment components form a limit from the top and bottom of the opening end of the first sleeve 43, forming a combination of "basic fixation + elastic buffer + bidirectional anti-detachment" protection with the threaded connection. This not only resists the risk of connection loosening caused by equipment vibration, but also eliminates the need for complicated tools to operate one by one, providing structural support for subsequent quick disassembly and assembly, and improving connection stability and ease of operation.

[0017] like Figure 3 and Figure 4As shown, the anti-detachment component includes a locking block 46 and a second spring 47. The top and bottom of the inner wall of the open end of the first sleeve 43 are both provided with inner grooves. The locking block 46 is located in the inner groove. The second spring 47 is fixedly connected between the locking block 46 and the inner groove. One end of the locking block 46 can extend out of the inner groove and into the annular groove 411 on the outer wall of the first protective tube 41. Both corners of the end of the locking block 46 extending out of the inner groove are set as inclined surfaces. The outer ring of the collar 44 near the locking block 46 is set as an inclined surface. The collar 44 can move into the first sleeve 43 and press against the inclined surface 47 on the bottom side of the locking block 46. The anti-detachment component adopts an elastic cooperation structure between the locking block 46 and the second spring 47. The locking block 46 can be pressed against the second spring 47. Under the action of 7, the inner groove extends out and is locked into the annular groove 411 of the first protective tube 41, forming a precise limit. The inclined surface 1 of the protruding end of the locking block 46 is adapted to the inclined surface 2 of the collar 44. When disassembly is required, pushing the collar 44 can squeeze the locking block 46 back into the inner groove through the inclined surface, and the limit can be released without damaging the structure, which is more convenient than the traditional fixing method. At the same time, the two sets of anti-detachment components are symmetrically distributed on the inner wall of the opening end of the first sleeve 43, which can apply force evenly from the top and bottom sides, avoiding the problem of uneven force caused by unilateral limit, and ensuring that the joint between the first tube body 1 and the second tube body 2 is in a stable state for a long time. Even under high-frequency vibration conditions such as dump trucks, it can effectively prevent the connection from loosening and ensure the stable transmission of high-pressure media.

[0018] like Figure 6 and Figure 7 As shown, the second connecting mechanism 5 includes a second sleeve 51 and a locking component 52. The outer wall of the connecting pipe 3 is sequentially provided with threads and an annular groove 31. The second sleeve 51 is sleeved on the end of the first pipe 1 away from the second pipe 2, and the inner wall of the second sleeve 51 is threadedly connected to the threaded portion of the outer wall of the connecting pipe 3. Notches 511 are provided at the top and bottom of the open end of the second sleeve 51. Two sets of locking components 52 are provided and installed in the two notches 511 respectively. Both locking components 52 are engaged with the annular groove 31 on the outside of the connecting pipe 3. The connection is achieved by providing threads and annular grooves on the outer wall of the connecting pipe 3. 31. The threaded connection of the second sleeve 51 and the engagement of the two sets of locking components 52 form a dual fixing structure of "threaded fastening + locking limit". Compared with the traditional bolt connection, which requires tightening one by one and the clamping force of the clamp is uneven, this structure does not require complicated tools. It can be fixed by simply screwing the second sleeve 51 into the thread and engaging the locking components 52, which greatly shortens the disassembly and assembly time. At the same time, the matching design of the annular groove 31 and the locking components 52 can prevent the pipeline from axial displacement under high pressure and vibration environment, ensure the stable connection between the connecting pipeline 3 and the first pipe body 1, and improve the sealing and safety of the overall pipeline system.

[0019] like Figures 7-10As shown, the locking assembly 52 includes a flip plate 521, a second fixed shaft 523, a limiting plate 524, and a fourth spring 525. A first fixed shaft 512 is installed at the inner end of the notch 511. The flip plate 521 is rotatably sleeved on the first fixed shaft 512, and when the flip plate 521 is in a horizontal state, its outer wall is flush with the outside of the second sleeve 51. A groove 522 is provided at the bottom of the flip plate 521, and the second fixed shaft 523 is installed at the inner end of the groove 522. The limiting plate 524 is L-shaped, with one end hinged to the second fixed shaft 523 and the other end facing the connecting pipe 3. The other end of the limiting plate 524 is toothed and engages with the annular groove 31 on the connecting pipe 3. The fourth spring 525 is fixedly connected to the bottom of the limiting plate 524 and the groove 522. Between the inner walls, the locking assembly 52 adopts a collaborative structure of a flip plate 521, a limiting plate 524, and a fourth spring 525. The flip plate 521 can rotate around the first fixed axis 512 and is flush with the outer wall of the second sleeve 51 in a horizontal state, without occupying additional space. The L-shaped limiting plate 524 is hinged through the second fixed axis 523, and its toothed end can accurately engage with the annular groove 31 of the connecting pipe 3. The fourth spring 525 provides a continuous elastic force for the limiting plate 524 to ensure a tight and secure engagement. When disassembly is required, simply rotating the flip plate 521 will cause the limiting plate 524 to disengage from the annular groove 31. The operation is simple and efficient. Compared with the traditional fixing structure, it does not require the disassembly of multiple parts, which significantly improves maintenance efficiency. At the same time, the toothed engagement design is more resistant to the risk of loosening caused by vibration than a smooth engagement, ensuring connection stability.

[0020] like Figure 6 and Figure 7 As shown, the outer wall of the open end of the second sleeve 51 is provided with an outer edge, and a fixing ring 53 is fixedly sleeved on the other end of the second sleeve 51. A compression ring 54 is sleeved on the outside of the second sleeve 51 and between the fixing ring 53 and the outer edge. A third spring 55 is connected between the compression ring 54 and the fixing ring 53. Under normal conditions, the compression ring 54 is located at the notch 511 at the open end of the second sleeve 51, and the inner wall of the compression ring 54 is in contact with the outer wall of the flip plate 521. A slidable compression ring 54 is provided on the outside of the second sleeve 51 and is connected to the fixing ring 53 through the third spring 55. Under normal conditions, the compression ring 54 can fit tightly against the outer wall of the flip plate 521, forming a continuous compression limit on the flip plate 521, preventing it from rotating on its own due to equipment vibration and causing the locking component 52 to loosen. At the same time, the design of the outer edge can limit the sliding range of the compression ring 54 and prevent it from leaving the working area.

[0021] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A novel high-temperature and high-pressure resistant oil return hose, characterized in that, include: The first tube (1) and the second tube (2) are both made of woven aramid yarn with dipped and twisted filaments. The ends of the first tube (1) and the second tube (2) are connected. A sealing gasket (12) is provided between the joint ends of the first tube (1) and the second tube (2). The sealing gasket (12) has a gradually thinning fitting ring on the side near the first tube (1). A sealing groove (13) that matches the fitting ring is opened on the outside of the first tube (1). The first connecting mechanism (4) is sleeved on the outside of the joint end between the first tube body (1) and the second tube body (2); The connecting pipe (3) is located at the end of the first pipe body (1) away from the second pipe body (2), and the connecting pipe (3) is connected to the first pipe body (1); The second connecting mechanism (5) is sleeved on the outside of the connection end between the first pipe body (1) and the connecting pipe (3).

2. The novel high-temperature and high-pressure resistant return oil hose according to claim 1, characterized in that, The first connecting mechanism (4) includes a first protective tube (41), a second protective tube (42), a first sleeve (43), a collar (44), and an anti-detachment component. The first protective tube (41) is fixedly sleeved on the end of the first tube body (1), and the second protective tube (42) is fixedly sleeved on the end of the second tube body (2). An integral flange end is provided at the joint end of the first tube body (1) and the second tube body (2). The outer wall of the first protective tube (41) is flush with the flange end of the first tube body (1). The first sleeve (43) is sleeved on the first tube body (1) and the second tube body (2). At the joint end of the two tubes (2), the inner wall of the first sleeve (43) is threadedly connected to the outer wall of the first protective tube (41). An annular groove (411) is provided on the outer wall of the first protective tube (41) away from the second tube (2). The collar (44) is fitted in the annular groove (411), and a first spring (45) is connected between the side of the collar (44) away from the second tube (2) and the inner wall of the annular groove (411). Two sets of anti-detachment components are provided, and the two anti-detachment components are located at the top and bottom of the inner wall of the opening end of the first sleeve (43).

3. The novel high-temperature and high-pressure resistant return oil hose according to claim 2, characterized in that, The anti-detachment component includes a locking block (46) and a second spring (47). The top and bottom of the inner wall of the opening end of the first sleeve (43) are provided with inner grooves. The locking block (46) is located in the inner groove. The second spring (47) is fixedly connected between the locking block (46) and the inner groove. One end of the locking block (46) can extend out of the inner groove and extend into the annular groove (411) on the outer wall of the first protective tube (41). The two corners of the end of the locking block (46) extending out of the inner groove are both set as inclined surfaces one. The outer ring of the collar (44) near the locking block (46) is set as inclined surface two. The collar (44) can move into the first sleeve (43) and squeeze the inclined surface one on the bottom side of the locking block (46).

4. The novel high-temperature and high-pressure resistant return oil hose according to claim 1, characterized in that, The second connecting mechanism (5) includes a second sleeve (51) and a locking component (52). The outer wall of the end of the connecting pipe (3) is provided with threads and an annular groove (31) in sequence. The second sleeve (51) is sleeved on the end of the first pipe (1) away from the second pipe (2), and the inner wall of the second sleeve (51) is threaded to the threaded part of the outer wall of the connecting pipe (3). Notches (511) are provided at the top and bottom of the opening end of the second sleeve (51). Two sets of locking components (52) are provided and installed in the two notches (511) respectively. Both locking components (52) are engaged with the annular groove (31) outside the connecting pipe (3).

5. The novel high-temperature and high-pressure resistant return oil hose according to claim 4, characterized in that, The locking assembly (52) includes a flip plate (521), a second fixed shaft (523), a limiting plate (524), and a fourth spring (525). A first fixed shaft (512) is installed at the inner end of the notch (511). The flip plate (521) is rotatably sleeved on the first fixed shaft (512), and when the flip plate (521) is in a horizontal state, its outer wall is flush with the outside of the second sleeve (51). A groove (522) is provided at the bottom of the flip plate (521). The second fixed shaft... (523) Installed in the inner end of the groove (522), the limiting plate (524) is set in L shape, one end of the limiting plate (524) is hinged to the second fixed shaft (523), the other end of the limiting plate (524) faces the connecting pipe (3), and the other end of the limiting plate (524) is set in tooth shape and engages in the annular groove (31) on the connecting pipe (3). The fourth spring (525) is fixedly connected between the bottom of the limiting plate (524) and the inner wall of the groove (522).

6. The novel high-temperature and high-pressure resistant return oil hose according to claim 5, characterized in that, The outer wall of the opening end of the second sleeve (51) is provided with an outer edge, and a fixing ring (53) is fixedly sleeved at the other end of the second sleeve (51). A compression ring (54) is sleeved outside the second sleeve (51) and between the fixing ring (53) and the outer edge. A third spring (55) is connected between the compression ring (54) and the fixing ring (53). Under normal conditions, the compression ring (54) is located at the notch (511) at the opening end of the second sleeve (51), and the inner wall of the compression ring (54) is in contact with the outer wall of the flip plate (521).

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