A high-strength wear-resistant overhead conductor

Abstract

This invention discloses a high-strength, wear-resistant overhead conductor, relating to the field of overhead conductor technology. It includes a first conductor, a sleeve, and a second conductor arranged sequentially. The top of the sleeve is provided with a support cylinder and a side cylinder for flame retardancy. The side cylinder has a cavity for filling with flame retardant, and an air bladder communicating with the cavity is located outside the side cylinder. The cavity has a puncture mechanism for connecting it to the sleeve. The cavity also has a actuating mechanism for moving the flame retardant. The linkage mechanism includes a slider, a liquid box, and a flashing light. The slider is slidably disposed inside the support cylinder, the liquid box is installed inside the sleeve, and the flashing light is installed on the outer wall of the support cylinder. This high-strength, wear-resistant overhead conductor, through the inclusion of conductive components and a puncture mechanism, achieves the effects of preventing flame retardant solidification and rapid flame retardancy, thus improving the efficiency of overhead conductor use.

Description

Technical Field

[0001] This invention relates to the field of overhead conductor technology, and in particular to a high-strength, wear-resistant overhead conductor. Background Technology

[0002] Overhead conductors are a type of bare electrical wire used for overhead power transmission lines. Because overhead conductors are mostly used to transmit large currents, their specifications are relatively large, with a cross-sectional diameter generally above 10 millimeters, and the largest specifications reaching hundreds or even thousands of square millimeters. Overhead conductors are mainly composed of a steel core (i.e., a reinforcing core) and aluminum stranded wire. The steel core serves as the reinforcing and load-bearing part, while the aluminum stranded wire serves as the conductive part.

[0003] Overhead conductors are prone to leakage at their joints due to loose connections, which can lead to sparks in severe cases. Existing overhead cables typically lack flame-retardant properties, making it difficult to handle emergency situations such as sparks, and their efficiency needs to be improved.

[0004] Therefore, it is necessary to propose a high-strength, wear-resistant overhead conductor to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a high-strength, wear-resistant overhead conductor to solve the problem that existing overhead cables usually do not have flame-retardant properties, making it difficult to handle emergency situations such as sparks, and thus their efficiency needs to be improved.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a high-strength wear-resistant overhead conductor, comprising a first conductor, a sleeve, and a second conductor arranged sequentially, wherein the top end of the sleeve is provided with a support cylinder and a side cylinder for flame retardancy.

[0007] The side cylinder has an internal cavity for filling flame retardant, an external air bladder communicating with the cavity, and an internal puncture mechanism for communicating the cavity with the sleeve.

[0008] The material chamber is equipped with a prying mechanism for moving the flame retardant.

[0009] When leakage generates high temperature, the linkage mechanism and the actuating mechanism are used to actuate the flame retardant to prevent solidification. When a spark is generated, the linkage mechanism presses the gas inside the support cylinder into the side cylinder, pushes the puncture mechanism to move, and the airbag expands. When the material chamber is connected to the sleeve, the airbag contracts to accelerate the flame retardant to be sprayed into the sleeve for flame retardancy.

[0010] Preferably, the linkage mechanism includes a slider, a liquid box, and a flashing light. The liquid box is filled with a low-boiling-point solution. When the low-boiling-point solution is affected by the high temperature generated by the leakage current, it pushes the slider to move upward and activates the flashing light.

[0011] Preferably, the low-boiling-point solution is a tetrahydrofuran solvent.

[0012] Preferably, a partition is slidably arranged inside the side cylinder, wherein the material cavity is located below the partition, and an air cavity is formed above the partition, and the support cylinder is connected and cooperates with the air cavity.

[0013] Preferably, a second spring is provided inside the air cavity.

[0014] Preferably, the piercing mechanism includes a piercing tube, which is fixedly connected to the bottom end of the partition.

[0015] Preferably, the lower half of the piercing tube is wavy.

[0016] Preferably, the piercing tube has a side groove.

[0017] Preferably, the actuating mechanism includes an actuating frame and a vertical plate, and the linkage mechanism uses a magnetic mechanism to cooperate with the actuating mechanism to actuate the flame retardant before extinguishing the fire.

[0018] Preferably, the sleeve is provided with a material hole for communicating with the material cavity and the sleeve, and a sealing plate is fixedly connected inside the material hole.

[0019] The technical effects and advantages of this invention are as follows:

[0020] 1. This invention achieves the effects of preventing flame retardant from solidifying and rapid flame retardancy by setting up conductive components, puncture mechanisms and other structures, thereby improving the efficiency of overhead conductors.

[0021] 2. By setting up structures such as through holes and air chambers, and utilizing the movement of the slider in conjunction with the partition, the piercing tube punctures the sealing plate, making the operation convenient;

[0022] 3. The piercing tube punctures the sealing plate, allowing the flame retardant to be sprayed into the sleeve through the puncture. The downward sliding of the partition plate generates pressure, ensuring a stable spray of the flame retardant and guaranteeing the fire extinguishing effect.

[0023] 4. By setting up airbags, the speed at which flame retardant is sprayed is accelerated with the help of the airbag's contraction elasticity, thereby improving the fire extinguishing effect;

[0024] 5. The lower half of the piercing tube is wavy, which makes the tear at the opening more obvious when the piercing tube pierces the sealing plate, thus facilitating the spraying of flame retardant.

[0025] 6. When the slider moves upward, it will drive the actuating frame to move upward synchronously through the vertical plate, actuating the flame retardant before extinguishing the fire, ensuring the stability of the fire extinguishing operation. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the high-strength wear-resistant overhead conductor structure of the present invention.

[0027] Figure 2 This is a schematic diagram of the support cylinder and side cylinder structure of the present invention.

[0028] Figure 3 This is a schematic diagram of the upper and lower components of the present invention.

[0029] Figure 4 For the present invention Figure 3 Enlarged schematic diagram of the structure at point A in the middle.

[0030] Figure 5 For the present invention Figure 4 Enlarged schematic diagram of the structure at point B.

[0031] Figure 6 This is a schematic diagram of the toggle frame and vertical plate structure of the present invention.

[0032] Figure 7 This is a schematic diagram of the piercing tube and side groove structure of the present invention.

[0033] In the diagram: 1. First production line; 2. Second production line; 3. Sleeve; 301. Upper assembly; 302. Lower assembly; 4. Support cylinder; 5. Side cylinder; 501. Air chamber; 502. Material chamber; 6. Through hole; 7. Slider; 8. Elastic telescopic rod; 9. First conductive sheet; 10. Second conductive sheet; 11. Solar panel; 12. First spring; 13. Round hole; 14. Slot; 15. Liquid box; 16. Partition; 17. Spike tube; 18. Through groove; 19. Airbag; 20. Material hole; 21. Sealing plate; 22. Actuating frame; 23. Vertical plate; 24. First magnet; 25. Second magnet; 26. Side groove; 27. Flashing light; 28. Second spring. Detailed Implementation

[0034] This invention provides, for example Figures 1 to 7 The high-strength wear-resistant overhead conductor shown includes a first conductor 1 and a second conductor 2. A sleeve 3 is provided between the first conductor 1 and the second conductor 2. The sleeve 3 includes an upper fitting 301 and a lower fitting 302, which are fixed by bolts or other structures. The joint of the first conductor 1 and the second conductor 2 is located inside the sleeve 3. The sleeve 3 protects the joint of the first conductor 1 and the second conductor 2, while ensuring a stable connection between the first conductor 1 and the second conductor 2, thus improving the strength of the overhead conductor. In addition, both the first conductor 1 and the second conductor 2 are provided with a wear-resistant layer on the outside to reduce wear between them and the sleeve 3.

[0035] It should be noted that both the upper kit 301 and the lower kit 302 are made of heat-dissipating materials, such as insulating plastic, which do not affect the heat dissipation at the joint of the first wire 1 and the second wire 2, and can be adjusted according to the specific usage.

[0036] Considering that the joint between the first conductor 1 and the second conductor 2 is prone to leakage, sparks, etc. due to poor connection, refer to Figure 1 , Figure 2 , Figure 3 As shown, in order to achieve the effects of leakage current indication and flame retardancy, and to facilitate maintenance by construction personnel, a support cylinder 4 is provided at the top of the sleeve 3. The support cylinder 4 is located on the upper kit 301. In specific installation, the upper kit 301 is located above the lower kit 302, and the support cylinder 4 is located on the top of the upper kit 301. The support cylinder 4 is used to indicate leakage current and remind the inspection personnel to pay attention to the fault.

[0037] Reference Figure 3 , Figure 4 As shown, a linkage mechanism is provided between the upper assembly 301 and the support cylinder 4. The linkage mechanism includes a slider 7, a liquid box 15, and a flashing light 27. The slider 7 is slidably disposed inside the support cylinder 4. A first spring 12 is fixedly connected to the bottom end of the slider 7. The bottom end of the first spring 12 is fixedly connected to the bottom of the support cylinder 4. The first spring 12 is provided for the reset of the slider 7. The liquid box 15 is installed inside the sleeve 3. The liquid box 15 is close to the joint of the first wire 1 and the second wire 2. The flashing light 27 is installed on the outer wall of the support cylinder 4. When the flashing light 27 is working, it can emit flashing light. The liquid box 15 corresponds to the bottom end of the support cylinder 4, and the liquid box 15 and the support cylinder 4 are connected by a connecting component. The liquid box 15 is filled with a low-boiling-point solution. The low-boiling-point solution can be, but is not limited to, tetrahydrofuran solvent.

[0038] When leakage occurs, it generates accumulated high temperature. The tetrahydrofuran solvent slowly boils under the influence of the high temperature, producing a large amount of gas. The gas enters the interior of the support cylinder 4 through the connecting component, pushing the slider 7 to move upward. The conductive component then activates the flashing light 27 to alert the patrol personnel.

[0039] Furthermore, low-boiling-point solutions absorb heat when boiling, thus absorbing some of the high-temperature heat generated by leakage current, achieving a heat dissipation effect.

[0040] Reference Figure 3 , Figure 4 As shown, the conductive component includes an elastic telescopic rod 8, a first conductive sheet 9, and a second conductive sheet 10. When the first conductive sheet 9 and the second conductive sheet 10 come into contact, the flashing light 27 can be powered on and activated. The elastic telescopic rod 8 is fixedly connected to the top of the slider 7, the first conductive sheet 9 is installed on the top of the elastic telescopic rod 8, and the second conductive sheet 10 is installed on the lower surface of the top of the liquid box 15. The flashing light 27 is activated by the movement of the slider 7.

[0041] Specifically, when the slider 7 moves upward, it will drive the first conductive sheet 9 to move upward synchronously through the elastic telescopic rod 8. When the first conductive sheet 9 and the second conductive sheet 10 come into contact, the flashing light 27 is activated and flashing light occurs.

[0042] After the leakage hazard is eliminated, the reset force of the first spring 12 causes the slider 7 and other structures to reset, and the flashing light 27 stops operating.

[0043] Reference Figure 4 As shown, in a specific configuration, the connecting component includes a circular hole 13 and a slot 14. The circular hole 13 is formed on the outer arc surface of the upper component 301, and the slot 14 is formed on the inner arc surface of the upper component 301. The circular hole 13 and the slot 14 are connected, and the liquid box 15 is installed in the slot 14 by a snap-fit ​​connection. The liquid box 15 can be made of, but is not limited to, alumina ceramic material, which is both thermally conductive and insulating, facilitating the boiling of low-boiling-point solutions, and can be adjusted according to specific usage conditions.

[0044] During actual installation, before the first line body 1 and the second line body 2 are spliced ​​and fixed, the liquid box 15 is installed into the slot 14. That is, during the previous transfer and other steps, the liquid box 15 is separated from the upper kit 301. The liquid box 15 can be closed with a cap to prevent low boiling point solution from spilling out at will.

[0045] The bottom of the support cylinder 4 is funnel-shaped, which facilitates the return of the low-boiling-point solution to the interior of the liquid box 15 after cooling.

[0046] Furthermore, this overhead conductor is particularly suitable for indoor installation, as low-boiling-point solutions are unaffected by external sunlight, ensuring timely and accurate fault signals.

[0047] A power supply device (not shown in the figure) is installed on the support cylinder 4 to power the flashing light 27. The power supply device includes a battery and other structures. A solar panel 11 is fixedly installed on the top of the support cylinder 4. The solar panel 11 charges the battery with the help of a solar controller and other structures to achieve the purpose of energy saving and environmental protection.

[0048] Reference Figure 3 , Figure 4 As shown, considering that partial leakage may cause sparks, especially when the sleeve 3 is located above flammable materials, there will be a certain delay if we wait for the patrol personnel to rescue. In order to achieve a rapid flame-retardant effect, a side tube 5 is provided at the top of the sleeve 3. The side tube 5 is fixedly connected to the side wall of the support tube 4, and both the support tube 4 and the side tube 5 are located on the upper kit 301. The side tube 5 is used to extinguish the fire.

[0049] A partition 16 is slidably disposed inside the side cylinder 5. An air chamber 501 is formed above the partition 16, and a material chamber 502 is formed below the partition 16. A second spring 28 is disposed inside the air chamber 501. One end of the second spring 28 is fixedly connected to the lower surface of the top of the side cylinder 5, and the other end of the second spring 28 is fixedly connected to the partition 16. A through hole 6 is opened on the side wall of the side cylinder 5, and the support cylinder 4 communicates with the air chamber 501 through the through hole 6. When the slider 7 slides upward inside the support cylinder 4, it will force the gas in the upper half of the support cylinder 4 into the air chamber 501, causing the partition 16 to slide downward. That is, the sliding of the slider 7 drives the sliding of the partition 16.

[0050] Furthermore, sealing gaskets can be installed between the slider 7 and the inner wall of the support cylinder 4, and between the partition plate 16 and the inner wall of the side cylinder 5, to increase wear resistance and improve sealing performance.

[0051] The interior of the material chamber 502 is filled with flame retardants, including ammonium phosphate salts, which, like dry powder extinguishing agents, have the characteristics of fast extinguishing speed and high efficiency.

[0052] Reference Figure 4 As shown, the upper kit 301 is provided with a material hole 20. The material cavity 502 and the sleeve 3 can be connected through the material hole 20. A sealing plate 21 is fixedly connected inside the material hole 20. The sealing plate 21 can be made of aluminum foil, but is not limited to aluminum foil. It is easily punctured. When the sealing plate 21 is punctured, the flame retardant can enter the sleeve 3 through the puncture for emergency treatment.

[0053] Reference Figure 3 , Figure 4 As shown, the material cavity 502 is provided with a piercing mechanism for communicating with the sleeve 3. The piercing mechanism includes a piercing tube 17, which is fixedly connected to the bottom end of the partition plate 16.

[0054] Specifically, when leakage occurs, a cumulative high temperature is generated. The tetrahydrofuran solvent slowly boils under the influence of the high temperature, generating a large amount of gas. The gas enters the interior of the support cylinder 4, pushing the slider 7 upward. When the first conductive plate 9 and the second conductive plate 10 come into contact, the flashing light 27 is activated, producing a flashing light. At the same time, the slider 7 will press the gas in the upper half of the support cylinder 4 into the gas chamber 501, causing the partition 16 to slide downward. However, during this process, because the generated high temperature is lower than the temperature when sparks occur, the upward movement distance of the slider 7 is limited, the elastic telescopic rod 8 only retracts slightly, and the amount of gas entering the gas chamber 501 is limited. Although the piercing tube 17 moves downward, it will not come into contact with the sealing plate 21, and the flame retardant will not be used.

[0055] Furthermore, when a spark occurs, the temperature generated will be significantly higher than that when there is only leakage. The tetrahydrofuran solvent will slowly boil under the influence of high temperature, and more gas will be generated compared to when there is leakage. The slider 7 will slide upward more significantly, the elastic telescopic rod 8 will contract more significantly, and more gas will be forced into the gas chamber 501. Therefore, the partition 16 will slide downward a greater distance, and the piercing tube 17 will pierce the sealing plate 21. After the sealing plate 21 is pierced, the flame retardant can be sprayed into the sleeve 3 from the puncture, achieving a rapid flame retardant effect. Moreover, the downward sliding of the partition 16 can generate pressure to ensure the stable spraying of the flame retardant, thus ensuring the fire extinguishing effect.

[0056] This invention, by incorporating conductive components and puncture mechanisms, can promptly issue a fault signal when there is a leakage, while simultaneously achieving rapid flame retardancy and improving the efficiency of overhead power lines.

[0057] By setting up structures such as through holes 6 and air chambers 501, and utilizing the movement of slider 7 and its cooperation with partition 16, the piercing tube 17 pierces the sealing plate 21, making the operation convenient and sensitive.

[0058] In this invention, the elastic force of the elastic telescopic rod 8 is set appropriately. When leakage occurs, the slider 7 moves upward a limited distance, and the elastic telescopic rod 8 only contracts slightly. When sparks occur, the elastic telescopic rod 8 contracts more significantly.

[0059] Reference Figure 3 , Figure 4 As shown, in order to accelerate the speed of flame retardant spraying, a through groove 18 is provided on the side wall of the side cylinder 5, and an air bag 19 is fixedly connected to the outer wall of the side cylinder 5. The air bag 19 is connected to the material chamber 502. The air bag 19 is made of rubber and has a certain elasticity.

[0060] In the initial stage of the partition 16 sliding downward, since the sealing plate 21 is not punctured, the gas enters the airbag 19 due to the downward sliding of the partition 16, causing the airbag 19 to expand. When the sealing plate 21 is punctured, the airbag 19 contracts. With the assistance of the contraction elasticity of the airbag 19, the speed of flame retardant spraying is accelerated, and the fire extinguishing effect is improved.

[0061] Reference Figure 3 , Figure 4 As shown, the lower half of the piercing tube 17 is wavy, which makes the tear at the opening more obvious when the piercing tube 17 pierces the sealing plate 21, thus facilitating the spraying of flame retardant.

[0062] Reference Figure 7 As shown, a side groove 26 is provided on one side of the piercing tube 17 to facilitate the rapid introduction of flame retardant into the sleeve 3, and the side groove 26 is preferably located near the joint of the first wire 1 and the second wire 2.

[0063] Reference Figure 4 , Figure 6As shown, to prevent the flame retardant from solidifying and affecting the subsequent fire extinguishing effect, a moving mechanism for moving the flame retardant is provided inside the material cavity 502. The moving mechanism includes a moving frame 22 and a vertical plate 23. The moving frame 22 is slidably disposed inside the material cavity 502, and the vertical plate 23 is fixedly connected to the moving frame 22. The vertical plate 23 is located on the side of the moving frame 22 near the support cylinder 4. The linkage mechanism uses a magnetic mechanism to drive the vertical plate 23 to move synchronously. The magnetic mechanism includes a first magnet 24 and a second magnet 25. The first magnet 24 is fixedly embedded on the side of the slider 7 near the side cylinder 5, and the second magnet 25 is fixedly embedded on the side of the vertical plate 23 near the support cylinder 4. The magnetic properties of the first magnet 24 and the second magnet 25 on the side close to each other are opposite, so that the slider 7 and the vertical plate 23 can move up and down synchronously. The support cylinder 4 and the side cylinder 5 are made of materials that are not affected by magnetic force, such as plastic, and the wall thickness is appropriate so as not to affect the cooperation of the first magnet 24 and the second magnet 25.

[0064] In actual use, since the magnetic properties of the first magnet 24 and the second magnet 25 are opposite on the side that are close to each other, when the slider 7 moves upward, it will drive the actuating frame 22 to move upward synchronously through the vertical plate 23. Before extinguishing the fire, the flame retardant is agitated to prevent solidification and ensure the stability of the fire extinguishing operation.

[0065] Working principle: When leakage occurs, a cumulative high temperature is generated. The tetrahydrofuran solvent slowly boils under the influence of the high temperature, generating a large amount of gas. The gas enters the interior of the support cylinder 4, pushing the slider 7 upward. When the first conductive plate 9 and the second conductive plate 10 come into contact, the flashing light 27 is activated, flashing brightly to remind the patrol personnel. At the same time, the slider 7 will force the gas in the upper half of the support cylinder 4 into the gas chamber 501, causing the partition 16 to slide downward. However, during this process, because the generated high temperature is lower than the temperature when sparks occur, the upward movement distance of the slider 7 is limited, the elastic telescopic rod 8 only retracts slightly, and the amount of gas entering the gas chamber 501 is limited. Although the piercing tube 17 moves downward, it will not come into contact with the sealing plate 21, and the flame retardant will not be used.

[0066] When a spark occurs, the temperature generated will be significantly higher than that when there is only leakage. The tetrahydrofuran solvent will slowly boil under the influence of high temperature, and more gas will be generated than when there is leakage. The slider 7 will slide upward more significantly, the elastic telescopic rod 8 will contract more significantly, and more gas will be forced into the gas chamber 501. Therefore, the partition 16 will slide downward a greater distance, and the piercing tube 17 will pierce the sealing plate 21. After the sealing plate 21 is pierced, the flame retardant can be sprayed into the sleeve 3 from the puncture, achieving a rapid flame retardant effect.

[0067] In the initial stage of the partition 16 sliding downward, since the sealing plate 21 is not punctured, the gas enters the airbag 19 due to the downward sliding of the partition 16, causing the airbag 19 to expand. When the sealing plate 21 is punctured, the airbag 19 contracts. With the assistance of the contraction elasticity of the airbag 19, the speed of flame retardant spraying is accelerated, and the fire extinguishing effect is improved.

Claims

1. A high-strength, wear-resistant overhead conductor, comprising a first conductor (1), a sleeve (3), and a second conductor (2) arranged sequentially, characterized in that: The top end of the sleeve (3) is provided with a support cylinder (4) and a side cylinder (5) for flame retardancy. The side cylinder (5) is provided with a material cavity (502) for filling flame retardant inside, and an airbag (19) communicating with the material cavity (502) is provided outside the side cylinder (5). The material cavity (502) is provided with a puncture mechanism for communicating the material cavity (502) with the sleeve (3). The material cavity (502) is provided with a toggle mechanism for moving the flame retardant; When leakage generates high temperature, the linkage mechanism and the actuation mechanism are used to actuate the flame retardant to prevent solidification. When sparks are generated, the linkage mechanism presses the gas inside the support cylinder (4) into the side cylinder (5), pushes the puncture mechanism to move, and the airbag (19) expands. When the material chamber (502) is connected to the sleeve (3), the airbag (19) contracts to accelerate the flame retardant to be sprayed into the sleeve (3) for flame retardant. The linkage mechanism includes a slider (7), a liquid box (15), and a flashing light (27). The slider (7) is slidably disposed inside the support cylinder (4). The liquid box (15) is installed inside the sleeve (3). The liquid box (15) is connected to the bottom end of the support cylinder (4). The liquid box (15) is filled with a low boiling point solution. The flashing light (27) is installed on the outer wall of the support cylinder (4). A first spring (12) is installed between the bottom end of the slider (7) and the bottom of the support cylinder (4). A conductive component is provided above the slider (7). The conductive component includes an elastic telescopic rod (8), a first conductive sheet (9), and a second conductive sheet (10). The elastic telescopic rod (8) is fixedly connected to the top of the slider (7). The first conductive sheet (9) is installed on the top of the elastic telescopic rod (8). The second conductive sheet (10) is installed on the lower surface of the top of the support cylinder (4). The first conductive sheet (9) and the second conductive sheet (10) are in contact with each other. The actuation mechanism includes an actuation frame (22) and a vertical plate (23). The actuation frame (22) is slidably disposed inside the material cavity (502). The vertical plate (23) is fixedly connected to the actuation frame (22). The vertical plate (23) is located on the side of the actuation frame (22) close to the support cylinder (4), and the vertical plate (23) moves synchronously with the slider (7).

2. The high-strength wear-resistant overhead conductor according to claim 1, characterized in that: The low-boiling-point solution is a tetrahydrofuran solvent.

3. The high-strength wear-resistant overhead conductor according to claim 1, characterized in that: The side cylinder (5) is slidably provided with a partition (16), wherein the material cavity (502) is located below the partition (16), and an air cavity (501) is formed above the partition (16). The support cylinder (4) is connected and cooperates with the air cavity (501).

4. The high-strength wear-resistant overhead conductor according to claim 3, characterized in that: A second spring (28) is provided inside the air cavity (501).

5. A high-strength wear-resistant overhead conductor according to claim 3, characterized in that: The piercing mechanism includes a piercing tube (17), which is fixedly connected to the bottom end of the partition (16).

6. A high-strength wear-resistant overhead conductor according to claim 5, characterized in that: The lower half of the piercing tube (17) is wavy.

7. A high-strength wear-resistant overhead conductor according to claim 5, characterized in that: The piercing tube (17) has a side groove (26).

8. A high-strength wear-resistant overhead conductor according to claim 1, characterized in that: The sleeve (3) is provided with a material hole (20) for communicating between the material cavity (502) and the sleeve (3), and a sealing plate (21) is fixedly connected inside the material hole (20).

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