Blast furnace charging car

Abstract

The utility model provides a blast furnace charging car. The blast furnace charging car comprises a hopper compartment, a sliding plate, a pushing assembly and a car cover, walking wheels are arranged at the bottom of the hopper compartment, and a side opening is formed in one side face of the hopper compartment. The sliding plate is movably arranged in the hopper compartment along a first path, the plate surface of the sliding plate is perpendicular to the first path, the peripheral edge of the sliding plate is attached to the inner wall of the hopper compartment, and the first path is parallel to the opening direction of the side opening; the pushing assembly is arranged in the hopper compartment and used for driving the sliding plate to reciprocate along the first path. And the vehicle cover movably covers the side opening. According to the blast furnace feeding trolley, the sliding plate capable of sliding in the long axis direction of the hopper compartment is arranged in the hopper compartment, after the yield of a blast furnace is increased, the sliding plate can be moved in the direction away from an outlet, the volume of the hopper compartment is increased, the situation that materials cannot be contained and fed at a time is avoided, and the feeding efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of blast furnace charging cars, and in particular relates to a blast furnace charging car. Background Art

[0002] The blast furnace is made of steel plates as the shell, and the shell is lined with refractory bricks. The blast furnace body is divided into five parts from top to bottom: throat, body, waist, belly and hearth. The blast furnace has the characteristics of good economic indicators, simple process, large production volume, high labor production efficiency and low energy consumption.

[0003] The two main ways of loading blast furnaces are the feed car and the belt feed car. The feed car has low investment and small footprint, and is widely used in small and medium-sized blast furnaces. However, the existing feed car has a certain volume. With the improvement of blast furnace technology and the increase of blast furnace output, the feed car cannot meet the feeding demand of blast furnaces. The materials transported in a single time cannot fill the blast furnace, and an additional feed car is needed to replenish the materials, which increases the cost of use; dumping materials in batches leads to lower efficiency of the blast furnace, affecting the output; when the feed car rises, the materials at the opening of the feed car are easily shaken and fall off, which is not conducive to the production of the blast furnace. Utility Model Content

[0004] The embodiment of the utility model provides a blast furnace charging car, aiming to solve the technical problems in the prior art that the volume of the blast furnace charging car is fixed, and multiple volumes of charging cars are needed for blast furnaces with different outputs, resulting in high use costs and the material is easily spilled when the charging car full of materials is loaded.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a blast furnace charging car, comprising:

[0006] A hopper box, with running wheels at the bottom and a side opening at one side of the hopper box;

[0007] a sliding plate movably disposed inside the hopper compartment along a first path, a plate surface of the sliding plate being perpendicular to the first path, and an outer peripheral edge of the sliding plate being in contact with an inner wall of the hopper compartment, and the first path being parallel to an opening direction of the side opening;

[0008] a pushing assembly, disposed in the hopper compartment and used to drive the sliding plate to reciprocate along the first path; and

[0009] A vehicle cover and a movable cover are arranged on the side opening.

[0010] In a possible implementation, the pushing component includes:

[0011] a fixing seat, located at a side of the sliding plate away from the side opening; and

[0012] A plurality of telescopic rods, both ends of which are respectively connected to the fixing seat and the sliding plate, and the telescopic direction of the telescopic rods is parallel to the first path.

[0013] In a possible implementation manner, an arc-shaped groove is provided on a plate surface of the sliding plate facing the side opening, and the arc-shaped groove is recessed in a direction away from the side opening.

[0014] In a possible implementation, a wear-resistant lining is provided at the bottom of the hopper compartment.

[0015] In a possible implementation, the top inner wall of the hopper compartment is provided with a plurality of positioning holes arranged along the first path, and the top of the sliding plate is correspondingly provided with plug-in protrusions that can slide up and down, and the plug-in protrusions are selectively plugged into and matched with the positioning holes.

[0016] In a possible implementation, a sliding groove opening upward is provided on the top of the sliding plate, the plug-in protrusion is slidably inserted in the sliding groove, an elastic member is provided between the sliding groove and the plug-in protrusion, and the elastic member is configured with a preload force that pushes the plug-in protrusion to move upward.

[0017] In a possible implementation, the blast furnace charging car also includes two shafts respectively arranged on both sides of the hopper box, and the middle parts of the two sides of the hopper box are respectively connected with reinforcing ribs, and the long axes of the reinforcing ribs are perpendicular to the first path. The middle parts of the two reinforcing ribs are respectively provided with rotating seats, and the rotating seats are connected to the shafts on the corresponding sides.

[0018] In a possible implementation, the hood is fixedly connected to the two shafts, and the shafts drive the hood to rotate around the rotating seat so that the hood blocks the side opening or moves away from the side opening, and a switch door is provided on the side of the hood away from the side opening.

[0019] In a possible implementation, sealing strips are provided around the vehicle hood to fill a gap between the vehicle hood and the side opening when the vehicle hood blocks the side opening.

[0020] In a possible implementation, the shaft includes a first section, a buffer section, and a second section connected in sequence along its length direction, the first section is connected to the rotating seat, and the second section is connected to the hoisting rope of the hoisting device; the first section and the second section are both long plate structures, and the buffer section includes:

[0021] A plug-in ring, both ends of which are respectively sleeved on the end of the first section and the end of the second section, one end of the plug-in ring is fixedly connected to the first section, and the other end of the plug-in ring is slidably plugged into the second section;

[0022] a buffer, two ends of which are respectively connected to the first section and the second section; and

[0023] The elastic sealing tube is respectively sleeved on the outer circumference of the plug-in ring and the second section, and the two ends are respectively connected to the plug-in ring and the second section.

[0024] The blast furnace charging car provided by the utility model, compared with the prior art, is provided with a sliding plate that can slide along a first path in the hopper compartment, the sliding plate can change the volume of the hopper compartment, and the sliding plate moves along the first path, which can reduce the volume of the hopper compartment to meet the initial material loading demand. When the blast furnace output increases, the sliding plate can be moved in the direction away from the side opening by pushing the assembly to increase the volume of the hopper compartment, and the situation that the material cannot be loaded and loaded at one time will not occur, thereby improving the loading efficiency, and the situation that the material is loaded in batches will not occur. Compared with the prior art, the number of loading times is reduced, and the impact on the blast furnace output is reduced; the car cover can block the side opening during the loading process of the hopper compartment to avoid the situation that the material is spilled, and at the same time can shield the material to avoid the material from mixing with rain and snow in rainy and snowy weather, thereby affecting the quality of blast furnace production. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 A schematic diagram of the main structure of a blast furnace charging vehicle provided in Embodiment 1 of the utility model;

[0027] Figure 2 for Figure 1 Schematic diagram of the unloading of the blast furnace charging car used;

[0028] Figure 3 for Figure 1 A front cross-sectional view of the hopper compartment used;

[0029] Figure 4 for Figure 3 A partial enlarged view of middle A;

[0030] Figure 5 for Figure 4 Cross-section from viewpoint B in the middle;

[0031] Figure 6 for Figure 1 A right side view of the hood used in the vehicle;

[0032] Figure 7 for Figure 1A front cross-sectional view of the shaft used in the invention;

[0033] Figure 8 for Figure 6 A side view of a buffer member used in;

[0034] Fig. 9 This is a side view of the buffer member used in the second embodiment of the present utility model.

[0035] Description of reference numerals:

[0036] 1. Hopper compartment; 11. Wear-resistant lining; 12. Positioning hole; 13. Reinforcement rib; 14. Rotating seat; 15. Traveling wheel;

[0037] 2. Sliding plate; 21. Arc groove; 22. Inserting protrusion; 221. Inclined surface; 222. Inserting column; 23. Elastic member; 24. Sliding groove; 241. Slot;

[0038] 3. Car hood; 31. Sealing strip; 32. Open and close door;

[0039] 4. Pushing assembly; 41. Fixed seat; 42. Telescopic rod;

[0040] 5. Shaft; 51. First section; 52. Buffer section; 521. Connecting ring; 522. Buffer piece; 523. Elastic sealing tube; 53. Second section. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with 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.

[0042] It should be noted that the terms "length", "width", "height", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0043] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "install", "connect", "connect", "fix", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In addition, the meaning of "multiple" and "several" is two or more, unless otherwise clearly and specifically defined.

[0045] Please also read Figures 1 to 9 Now, the blast furnace charging car provided by the utility model is described. The blast furnace charging car includes a hopper compartment 1, a sliding plate 2, a pushing assembly 4 and a car cover 3. A running wheel 15 is provided at the bottom of the hopper compartment 1, and a side opening is provided on the side of the hopper compartment 1; the sliding plate 2 is movably arranged inside the hopper compartment 1 along a first path, the plate surface of the sliding plate 2 is perpendicular to the first path, and the outer peripheral edge of the sliding plate 2 is in contact with the inner wall of the hopper compartment 1, and the first path is parallel to the opening direction of the side opening; the pushing assembly 4 is arranged in the hopper compartment 1, and is used to drive the sliding plate 2 to move back and forth along the first path; the car cover 3 is a movable cover arranged at the side opening.

[0046] It should be noted that the sliding plate 2 can be fixed relative to the hopper compartment 1 to ensure that the volume of the hopper compartment 1 does not change during use.

[0047] It should be noted that Figure 3 The direction of the arrow indicates the first path.

[0048] It should be noted that the shapes of the hood 3 and the opening are fitted to ensure that the hood 3 can block the opening.

[0049] During specific implementation, the hopper compartment 1 is in a loading state for upward transportation, at which time the hood 3 blocks the opening to prevent impurities from entering the hopper compartment 1 and prevent materials from jumping out of the hopper compartment 1 .

[0050] It should be noted that after the sliding plate 2 slides, the minimum volume and maximum volume of the hopper compartment 1 are formed. The minimum volume just meets the initial material loading requirements, and the maximum volume can meet the single material loading requirements after the blast furnace output increases. As the blast furnace output increases, the sliding plate 2 gradually slides away from the opening of the hopper compartment 1.

[0051] Compared with the prior art, the blast furnace charging car provided in the present embodiment has a sliding plate 2 that can slide along a first path arranged in the hopper compartment 1, and the sliding plate 2 can change the volume of the hopper compartment 1. The sliding plate 2 moves toward the first path, which can reduce the volume of the hopper compartment 1 to meet the initial material loading demand. When the blast furnace output increases, the sliding plate 2 can be moved in the direction away from the side opening by pushing the component 4 to increase the volume of the hopper compartment 1. The material will not be unable to be loaded and loaded at one time, which improves the loading efficiency and does not require the material to be loaded in batches. Compared with the prior art, the number of loading times is reduced, and the impact on the blast furnace output is reduced. The car cover 3 can block the side opening of the hopper compartment 1 during the loading process to avoid the material from spilling, and at the same time can block the material to avoid the material from mixing with rain and snow in rainy and snowy weather, which affects the quality of blast furnace production.

[0052] In some embodiments, see Figure 3 The pushing assembly 4 includes a fixed seat 41 and a plurality of telescopic rods 42. The fixed seat 41 is located on the side of the sliding plate 2 away from the side opening; the two ends of the plurality of telescopic rods 42 are respectively connected to the fixed seat 41 and the sliding plate 2, and the telescopic direction of the telescopic rods 42 is parallel to the first path. The fixed seat 41 can provide an installation position for the telescopic rods 42, ensuring that the plurality of telescopic rods 42 can be parallel to each other and have the same telescopic direction. The telescopic rods 42 can drive the sliding plate 2 to move along the length direction of the hopper compartment 1 to change the storage volume of the hopper compartment 1, and when the telescopic rods 42 stop telescoping, the sliding plate 2 can be fixed to the hopper compartment 1 to ensure that the storage volume of the hopper compartment 1 will not change during the process of filling materials.

[0053] Optionally, the telescopic rod 42 adopts a telescopic motor, and can also adopt a hydraulic cylinder, the two ends of the hydraulic cylinder are respectively connected to the fixed seat 41 and the sliding plate 2, and the telescopic rod 42 can also adopt a scissor-type telescopic frame.

[0054] During specific implementation, a maintenance door is provided on the side of the hopper compartment 1 facing away from the outlet, and a worker can repair and maintain the fixing seat 41 and the telescopic rod 42 through the maintenance door.

[0055] In some embodiments, see Figure 3 , Figure 4 and Figure 5 The sliding plate 2 is provided with an arc groove 21 on the plate surface facing the side opening, and the arc groove 21 is recessed in the direction away from the side opening. The setting of the arc groove 21 can eliminate the angle between the sliding plate 2 and the hopper compartment 1, and no material will remain at the angle, resulting in incomplete dumping.

[0056] In some embodiments, see Figure 3The bottom of the hopper compartment 1 is provided with a wear-resistant lining plate 11. The wear-resistant lining plate 11 can extend the service life of the hopper compartment 1. When the material is filled and dumped, the material and the wear-resistant lining plate 11 are in friction contact, and the hopper compartment 1 will not be damaged.

[0057] In specific implementation, the wear-resistant lining plate 11 is a whole piece of wear-resistant plate, and there is no gap between the bottom of the sliding plate 2 and the wear-resistant lining plate 11, so no material will remain.

[0058] In some embodiments, see Figure 3 The top inner wall of the hopper compartment 1 is provided with a plurality of positioning holes 12 arranged along the first path, and the top of the sliding plate 2 is correspondingly provided with a plug-in protrusion 22 that can slide up and down, and the plug-in protrusion 22 is selectively plugged into the positioning hole 12. The positioning hole 12 and the plug-in protrusion 22 are plugged up and down, which can further ensure the relative stability of the sliding plate 2 and the hopper compartment 1, improve the relative stability of the sliding plate 2 during use, and avoid volume changes.

[0059] In specific implementation, an inclined surface 221 is formed on the top of the plug-in protrusion 22 and gradually tilts downward in the direction of movement toward the opening, so that when the sliding plate 2 moves toward the opening, the plug-in protrusion 22 can be squeezed and automatically retracted downward, thereby increasing the convenience of movement.

[0060] In some embodiments, a lifting plate is provided on the top of the hopper compartment 1, and a positioning hole 12 is provided on the bottom of the lifting plate. The lifting plate, the sliding plate 2, the side wall of the hopper compartment 1, and the wear-resistant lining plate 11 constitute a material storage space. When the volume of the storage space needs to be further expanded, the lifting plate can be controlled to rise to expand the volume in the height direction of the hopper compartment 1. Due to the setting of the plug-in protrusion 22, after the height of the lifting plate is raised, the plug-in protrusion 22 can still be plugged and matched with the positioning hole 12.

[0061] In some embodiments, see Figure 5 The top of the sliding plate 2 is provided with a sliding groove 24 which is open upwards, and the plug-in protrusion 22 is slidably inserted in the sliding groove 24. An elastic member 23 is provided between the sliding groove 24 and the plug-in protrusion 22, and the elastic member 23 is configured with a pre-tightening force to push the plug-in protrusion 22 to move upwards. The elastic member 23 can push the plug-in protrusion 22 to move upwards, ensuring that the plug-in protrusion 22 can normally cooperate with the positioning hole 12 to position the sliding plate 2.

[0062] In specific implementation, the bottom of the sliding groove 24 is connected to a slot 241, and the plug-in protrusion 22 is provided with a plug-in column corresponding to the slot 241. The plug-in column 222 is plugged into the slot, and the elastic member 23 is sleeved on the outer periphery of the plug-in column 222 to guide the extension and contraction direction of the elastic member 23.

[0063] Optionally, the elastic member 23 may be a coil spring or a tower spring, as long as it can be deformed continuously and drive the plug-in protrusion 22 to rise, and they will not be listed one by one here.

[0064] In some embodiments, see Figure 1 The blast furnace charging car also includes two shafts 5 respectively arranged on both sides of the hopper compartment 1, and the middle parts of both sides of the hopper compartment 1 are respectively connected with reinforcing ribs 13, and the long axis of the reinforcing ribs 13 is perpendicular to the first path. The middle parts of the two reinforcing ribs 13 are respectively provided with rotating seats 14, and the rotating seats 14 are connected to the shafts 5 on the corresponding sides. The shafts 5 rotate with the rotating seats 14 as the rotation center, and the reinforcing ribs 13 can improve the structural strength of the hopper compartment 1 and prevent the compartment from being deformed or damaged with the rotating seats 14 as the center.

[0065] In some embodiments, see Figure 2 The cover 3 is fixedly connected to the two shafts 5, and the shafts 5 drive the cover 3 to rotate around the rotating seat 14, so that the cover 3 blocks the side opening or is away from the side opening. The side of the cover 3 away from the side opening is provided with a switch door 32 that can be opened and closed. The cover 3 is connected to the shafts 5, and when the hopper box 1 rotates around the shafts 5 to unload materials, the cover 3 can be automatically separated from the side opening of the hopper box 1 to ensure normal unloading.

[0066] In some embodiments, see Figure 1 The hood 3 is provided with a sealing strip 31 around it to fill the gap between the hood 3 and the side opening when the hood 3 blocks the side opening. The sealing strip 31 can improve the sealing performance and increase the blocking effect of the hood 3.

[0067] In a specific implementation, the sealing strip 31 can be a rubber strip or a silicone strip, which will not be listed here one by one.

[0068] In some embodiments, see Figure 7 The shaft 5 includes a first section 51, a buffer section 52 and a second section 53 which are connected in sequence along its length direction. The first section 51 is connected to the rotating seat 14, and the second section 53 is connected to the hoisting rope of the hoisting device. The first section 51 and the second section 53 are both long plate structures, and the buffer section 52 includes a plug-in ring 521, a buffer 522 and an elastic sealing tube 523. The two ends of the plug-in ring 521 are respectively sleeved on the end of the first section 51 and the end of the second section 53. One end of the plug-in ring 521 is fixedly connected to the first section 51, and the other end of the plug-in ring 521 is slidably plugged with the second section 53. The two ends of the buffer 522 are respectively connected to the first section 51 and the second section 53. The elastic sealing tube 523 is respectively sleeved on the outer periphery of the plug-in ring 521 and the second section 53, and the two ends are respectively connected to the plug-in ring 521 and the second section 53.

[0069] The shaft 5 provided in this embodiment is divided into three sections, the first section 51 is connected to the rotating seat 14, the second section 53 is connected to the hoisting rope of the hoisting device, the first section 51 and the second section 53 are connected through the buffer section 52, and the buffer 522 of the buffer section 52 can be extended. When the hoisting device is started or stopped, the second section 53 and the first section 51 will not change state at the same time, which prolongs the action time, and the material in the hopper compartment 1 is subjected to less impact, which reduces the friction loss between the material and the hopper compartment 1 and prolongs the service life of the hopper compartment 1. The plug-in ring 521 is sleeved on the outer periphery of the second section 53, which can guide the extension direction of the buffer 522 and ensure the original strength of the shaft 5. The elastic sealing tube 523 can seal the gap between the plug-in ring 521 and the second section 53 to prevent the buffer 522 from being contaminated and affecting the extension effect.

[0070] Optionally, the buffer member 522 is a buffer spring, which has good deformation continuity and high connection strength to meet the use requirements. Of course, other components, such as tower springs and rubber rods, can also be used as long as they can buffer the collision between the first section 51 and the second section 53 so that the states of the first section 51 and the second section 62 do not change synchronously. They will not be listed here one by one.

[0071] In a specific implementation, a plurality of buffer members 522 are provided, and the plurality of buffer members are arranged around the central axis of the plug-in ring 521. Fig. 9 A buffer member 522 can also be provided on the central axis of the plug ring 521, and the remaining buffer members 522 are arranged around the buffer member 522, see Figure 8 .

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A blast furnace charging car, characterized in that: include: A hopper box, with running wheels at the bottom and a side opening at one side of the hopper box; a sliding plate movably disposed inside the hopper compartment along a first path, a plate surface of the sliding plate being perpendicular to the first path, and an outer peripheral edge of the sliding plate being in contact with an inner wall of the hopper compartment, and the first path being parallel to an opening direction of the side opening; A pushing assembly, disposed in the hopper compartment and used to drive the sliding plate to reciprocate along the first path; as well as A vehicle cover and a movable cover are arranged on the side opening.

2. The blast furnace charging car according to claim 1, characterized in that: The pushing component comprises: a fixing seat, located at a side of the sliding plate away from the side opening; and A plurality of telescopic rods, both ends of which are respectively connected to the fixing seat and the sliding plate, and the telescopic direction of the telescopic rods is parallel to the first path.

3. The blast furnace charging car according to claim 1, characterized in that: The plate surface of the sliding plate facing the side opening is provided with an arc-shaped groove, and the arc-shaped groove is recessed in a direction away from the side opening.

4. The blast furnace charging car according to claim 1, characterized in that: The bottom of the hopper compartment is provided with a wear-resistant lining.

5. The blast furnace charging car according to claim 1, characterized in that: The top inner wall of the hopper compartment is provided with a plurality of positioning holes arranged along the first path, and the top of the sliding plate is correspondingly provided with plug-in protrusions that can slide up and down, and the plug-in protrusions are selectively plugged and matched with the positioning holes.

6. The blast furnace charging car according to claim 5, characterized in that: A sliding groove opening upward is provided on the top of the sliding plate, and the plug-in protrusion is slidably inserted in the sliding groove. An elastic member is provided between the sliding groove and the plug-in protrusion, and the elastic member is configured with a preload force for pushing the plug-in protrusion to move upward.

7. The blast furnace charging car according to claim 1, characterized in that: The blast furnace charging car also includes two shafts respectively arranged on both sides of the hopper box, and the middle parts of the two sides of the hopper box are respectively connected with reinforcing ribs, and the long axes of the reinforcing ribs are perpendicular to the first path. The middle parts of the two reinforcing ribs are respectively provided with rotating seats, and the rotating seats are connected to the shafts on the corresponding sides.

8. The blast furnace charging car according to claim 7, characterized in that: The vehicle cover is fixedly connected to the two shafts, and the shafts drive the vehicle cover to rotate around the rotating seat so that the vehicle cover blocks the side opening or moves away from the side opening. A switch door that can be opened and closed is provided on the side of the vehicle cover away from the side opening.

9. The blast furnace charging car according to claim 8, characterized in that: The vehicle cover is provided with sealing strips around the periphery so as to fill the gap between the vehicle cover and the side opening when the vehicle cover blocks the side opening.

10. The blast furnace charging car according to claim 7, characterized in that: The shaft comprises a first section, a buffer section and a second section which are sequentially connected along its length direction, the first section is connected to the rotating seat, and the second section is connected to the hoisting rope of the hoisting device; The first section and the second section are both long plate structures, and the buffer section includes: A plug-in ring, both ends of which are respectively sleeved on the end of the first section and the end of the second section, one end of the plug-in ring is fixedly connected to the first section, and the other end of the plug-in ring is slidably plugged into the second section; A buffer, two ends of which are respectively connected to the first section and the second section; as well as The elastic sealing tube is respectively sleeved on the outer circumference of the plug-in ring and the second section, and the two ends are respectively connected to the plug-in ring and the second section.

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