Explosion-proof synthetic furnace fire extinguishing device with mixed emptying hydrogen

Abstract

The application relates to the technical field of synthetic furnace fire extinguishing, in particular to a mixed emptying hydrogen explosion-proof synthetic furnace fire extinguishing device which comprises a connecting cover, the connecting cover is communicated with an exhaust port of a synthetic furnace, a square guide opening is formed on the side of the connecting cover far from the synthetic furnace, an annular injection pipe is arranged in the connecting cover and coaxial with the connecting cover, the annular injection pipe can inject nitrogen into the connecting cover, a follow-up mechanism is arranged on the connecting cover and communicated with the annular injection pipe, the follow-up mechanism comprises a driven assembly and an adjusting assembly, the driven assembly is connected with an impeller rotatably arranged in the connecting cover, when waste gas flows in the connecting cover, the impeller can drive the driven assembly to act and drive the adjusting assembly to change the amount of nitrogen introduced into the annular injection pipe, and a guide assembly is arranged on the connecting cover and connected with the driven assembly, the guide assembly can uniformly guide the mixed gas to the outside when the impeller rotates, so as to reduce the hydrogen emission concentration and improve the safety of waste gas emission.

Description

Technical Field

[0001] This invention relates to the field of fire extinguishing technology for synthesis furnaces, specifically an explosion-proof fire extinguishing device for synthesis furnaces that mixes and vents hydrogen gas. Background Technology

[0002] The purpose of the synthesis furnace is to produce hydrogen chloride gas by burning chlorine and hydrogen. In order to improve the safety of the production process, it is necessary to release the waste gas in the synthesis furnace at regular intervals. However, the waste gas contains a certain amount of hydrogen. If it is released directly, it is easy to cause an explosion and fire when the hydrogen concentration reaches a certain level.

[0003] In existing technologies, installing shut-off valves at the exhaust ports of synthesis furnaces can increase the fire extinguishing rate, ensure no internal leakage, and guarantee production safety. However, this method is prone to causing suffocation, which can affect the service life of the equipment. At the same time, the fire extinguishing rate is limited and cannot extinguish the fire in a timely manner. Summary of the Invention

[0004] The purpose of this invention is to provide an explosion-proof synthesis furnace fire extinguishing device for mixing and venting hydrogen gas, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An explosion-proof synthesis furnace fire extinguishing device for mixing and venting hydrogen gas includes:

[0007] A connecting cover is connected to the exhaust port of the synthesis furnace, and a square guide opening is formed on the side of the connecting cover away from the synthesis furnace;

[0008] An annular injection pipe is disposed inside the connecting cover and is coaxial with the connecting cover; the annular injection pipe is capable of injecting nitrogen gas into the connecting cover.

[0009] A follower mechanism is provided on the connecting cover and communicates with the annular injection pipe. The follower mechanism includes a driven component and an adjusting component. The driven component is connected to an impeller rotatably installed inside the connecting cover. When exhaust gas flows inside the connecting cover, the impeller can drive the driven component to move and drive the adjusting component to change the amount of nitrogen introduced into the annular injection pipe.

[0010] A guiding component is disposed on the connecting cover and connected to the driven component. The guiding component is capable of uniformly guiding the mixed gas to the outside when the impeller rotates.

[0011] As a further aspect of the present invention: the driven component includes a transmission rod rotatably mounted on the connecting cover, the transmission rod being connected to the impeller shaft via a bevel gear set;

[0012] A rotating plate is provided on the transmission rod, and two sliding grooves are provided on the rotating plate along its length. A counterweight slider is slidably installed in the sliding groove, and the counterweight slider is connected to an elastic structure provided on the transmission rod.

[0013] As a further embodiment of the present invention: the elastic structure includes a lifting sleeve sleeved on the transmission rod, and two traction rods are symmetrically and rotatably mounted on the lifting sleeve, with the end of the traction rod away from the lifting sleeve rotatably connected to the counterweight slider;

[0014] A cylindrical spring is also fitted on the transmission rod, with one end of the cylindrical spring connected to the rotating plate and the other end connected to the lifting sleeve.

[0015] As a further embodiment of the present invention: the lifting sleeve and the adjusting component are connected by a connecting component;

[0016] The connecting assembly includes an annular groove formed on the lifting sleeve, a collar is rotatably mounted in the annular groove, a horizontal plate is fixedly mounted on the collar, and the horizontal plate is connected to the adjusting assembly through a fitting kit.

[0017] As a further embodiment of the present invention: the fitting kit includes a pulley rotatably mounted on the end of the horizontal plate away from the collar and a drive plate connected to the adjustment assembly. The drive plate is provided with an inclined groove, and the pulley can roll within the inclined groove.

[0018] As a further embodiment of the present invention: the adjustment assembly includes an adjustment box disposed on the connecting cover, the adjustment box being connected to the annular injection tube via two conduits;

[0019] The adjustment box is provided with a partition, and a guide hole is formed on the partition. A guide member is provided on each side of the guide hole. A stop plate that slides and fits against the surface of the partition is slidably installed between the two guide members. The stop plate passes through the adjustment box and is connected to the drive plate.

[0020] As a further embodiment of the present invention: the guiding component includes a plurality of guide plates rotatably mounted on the square guide port, each of the two ends of the rotating shaft of the guide plate is connected to a follower rod, and a transverse rod is rotatably mounted on the end of the follower rod away from the guide plate;

[0021] The guiding assembly also includes a sway structure connecting the follower rod and the transmission rod, the sway structure being able to drive the follower rod to sway when the transmission rod rotates.

[0022] As a further embodiment of the present invention: the oscillating structure includes an oscillating rod fixedly connected to one of the follower rods and a turntable rotatably mounted on the connecting cover, the turntable being connected to the transmission rod via a belt;

[0023] The turntable and the yaw rod are connected by a fitting assembly.

[0024] As a further embodiment of the present invention: the fitting kit includes a connecting groove arranged along the length direction of the eccentric rod and a fitting wheel rotatably installed at the eccentric position of the turntable, the fitting wheel being able to roll within the connecting groove.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] By using a connecting hood, annular injection pipe, and follow-up mechanism, when the exhaust gas flows through the connecting hood, the impeller rotation drives the baffle to move, thus opening the passage. At this time, nitrogen can be delivered into the connecting hood to mix with the hydrogen in the exhaust gas, thereby reducing the concentration of hydrogen in the exhaust gas and preventing an explosion when the hydrogen concentration in the exhaust gas is too high upon encountering a source. At the same time, when the exhaust gas flows at a faster speed, the impeller rotates faster, and the baffle moves a greater distance, resulting in a larger opening area. At this time, the external nitrogen pumping device delivers more nitrogen into the annular injection pipe, so that the hydrogen in the exhaust gas can be mixed with nitrogen in a specific ratio to reduce the hydrogen content in the exhaust gas, thereby achieving the effect of extinguishing the fire.

[0027] By using the designed guiding components, the deflector plate reciprocates and oscillates during exhaust gas discharge, evenly discharging the mixture of exhaust gas and nitrogen to the outside, thus guiding the flow and preventing the mixture of exhaust gas and nitrogen from being discharged into a certain area outside, which would increase the concentration of exhaust gas and improve the safety of exhaust gas discharge. Attached Figure Description

[0028] Figure 1 A schematic diagram of one embodiment of an explosion-proof synthesis furnace fire extinguishing device for mixing and venting hydrogen gas.

[0029] Figure 2 for Figure 1 Enlarged view of the structure at point A in the middle.

[0030] Figure 3 This is a schematic diagram of the structure from another angle in one embodiment of an explosion-proof synthesis furnace fire extinguishing device for mixing and venting hydrogen gas.

[0031] Figure 4 This is a schematic diagram of the internal structure of the connecting cover in one embodiment of an explosion-proof synthesis furnace fire extinguishing device for mixing and venting hydrogen gas.

[0032] Figure 5A schematic diagram of the regulating component in one embodiment of an explosion-proof synthesis furnace fire extinguishing device for mixing and venting hydrogen gas.

[0033] Figure 6 A schematic diagram of the guiding component in one embodiment of an explosion-proof synthesis furnace fire extinguishing device for mixing and venting hydrogen gas.

[0034] Figure 7 for Figure 6 Enlarged view of the structure at point B in the middle.

[0035] In the diagram: 1. Connecting cover; 101. Square guide port; 2. Impeller; 3. Bevel gear set; 4. Transmission rod; 5. Rotating plate; 501. Slide groove; 6. Counterweight slider; 7. Pulling rod; 8. Lifting sleeve; 9. Collar; 10. Cylindrical spring; 11. Horizontal plate; 12. Pulley; 13. Drive plate; 1301. Inclined trough; 14. Stop plate; 15. Adjusting box; 16. Conduit; 17. Annular injection pipe; 18. Partition; 19. Guide; 20. Belt; 21. Turntable; 22. Fitting wheel; 23. Bias rod; 2301. Connecting groove; 24. Follower rod; 25. Lateral rod; 26. Guide plate. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Furthermore, elements in this invention are referred to as being "fixed to" or "set on" another element, which may be directly on the other element or may also include an intervening element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or may also include an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0038] Please see Figures 1 to 7In this embodiment of the invention, an explosion-proof synthesis furnace fire extinguishing device for mixing and venting hydrogen includes: a connecting cover 1, an annular injection pipe 17, a follow-up mechanism, and a guiding component. When the waste gas flows through the connecting cover 1, the impeller 2 rotates to drive the baffle 14, thus opening the passage. At this time, nitrogen can be transported to the connecting cover 1 to mix with the hydrogen in the waste gas, thereby reducing the concentration of hydrogen in the waste gas and preventing an explosion caused by excessive hydrogen concentration in the waste gas upon encountering a source. At the same time, when the waste gas flow speed is fast, the impeller 2 rotates faster, and the stroke of the baffle 14 is also greater, resulting in a larger opening area for the passage. At this time, the external nitrogen pumping device delivers more nitrogen towards the annular injection pipe 17, thereby allowing the hydrogen in the waste gas to mix with a specific proportion of nitrogen to reduce the hydrogen content in the waste gas.

[0039] Specifically, the connecting cover 1 is connected to the exhaust port of the synthesis furnace, and a square guide port 101 is formed on the side of the connecting cover 1 away from the synthesis furnace.

[0040] The annular injection pipe 17 is disposed inside the connecting cover 1 and is coaxial with the connecting cover 1. The annular injection pipe 17 can inject nitrogen into the connecting cover 1.

[0041] The follower mechanism is disposed on the connecting cover 1 and communicates with the annular injection pipe 17. The follower mechanism includes a driven component and an adjusting component. The driven component is connected to the impeller 2 rotatably installed in the connecting cover 1. When exhaust gas flows in the connecting cover 1, the impeller 2 can drive the driven component to move and drive the adjusting component to change the amount of nitrogen introduced into the annular injection pipe 17.

[0042] The driven component includes a transmission rod 4 rotatably mounted on the connecting cover 1, and the transmission rod 4 is connected to the shaft of the impeller 2 via a bevel gear set 3;

[0043] A rotating plate 5 is provided on the transmission rod 4. The rotating plate 5 has two sliding grooves 501 along its length. A counterweight slider 6 is slidably installed in the sliding grooves 501. The counterweight slider 6 is connected to an elastic structure provided on the transmission rod 4. The elastic structure includes a lifting sleeve 8 sleeved on the transmission rod 4. Two pulling rods 7 are symmetrically and rotatably installed on the lifting sleeve 8. The end of the pulling rod 7 away from the lifting sleeve 8 is rotatably connected to the counterweight slider 6.

[0044] A cylindrical spring 10 is also sleeved on the transmission rod 4. One end of the cylindrical spring 10 is connected to the rotating plate 5, and the other end is connected to the lifting sleeve 8. The lifting sleeve 8 is connected to the adjusting assembly through a connecting assembly. The connecting assembly includes an annular groove formed on the lifting sleeve 8. A collar 9 is rotatably installed in the annular groove. A horizontal plate 11 is fixedly installed on the collar 9. The horizontal plate 11 is connected to the adjusting assembly through a fitting kit. The fitting kit includes a pulley 12 rotatably installed on the horizontal plate 11 at the end away from the collar 9 and a drive plate 13 connected to the adjusting assembly. An inclined groove 1301 is provided on the drive plate 13, and the pulley 12 can roll in the inclined groove 1301.

[0045] The adjustment assembly includes an adjustment box 15 disposed on the connecting cover 1, and the adjustment box 15 is connected to the annular injection tube 17 through two conduits 16.

[0046] The adjustment box 15 is provided with a partition 18, and a guide port is formed on the partition 18. A guide 19 is provided on each side of the guide port. A stop plate 14 that slides and fits against the surface of the partition 18 is slidably installed between the two guides 19. The stop plate 14 passes through the adjustment box 15 and is connected to the drive plate 13.

[0047] In use, the regulating box 15 is connected to the external nitrogen pumping device via pipeline. In the initial state, the stop plate 14 is in the state of completely blocking the guide port. When the synthesis furnace discharges waste gas, the waste gas flows through the connecting cover 1. At this time, the impeller 2 will rotate under the drive of the waste gas. When the impeller 2 rotates, it can drive the transmission rod 4 to rotate through the bevel gear set 3, which in turn drives the rotating plate 5 to make a circular motion, and causes the counterweight slider 6 set on the rotating plate 5 to make a circular motion. When the counterweight slider 6 makes a circular motion, it will generate centrifugal force. Under the action of centrifugal force, the counterweight slider 6 will move away from the transmission rod 4 along the length direction of the slide groove 501. At the same time, the counterweight slider 6 will be pulled by the pull rod. 7. Pulling the lifting sleeve 8 towards the rotating plate 5 compresses the cylindrical spring 10 and drives the collar 9, which is rotatably connected to it, to move downward. At this time, the pulley 12 moves downward together with the collar 9 under the action of the horizontal plate 11. The pulley 12 is rolled in the inclined groove 1301, so that when the pulley 12 moves downward, the drive plate 13 will move towards the transmission rod 4, causing the stop plate 14 to move. During this process, the passage between the two partitions 18 is opened, so that the external nitrogen pumping device can deliver nitrogen to the annular injection pipe 17 and mix it with the waste, thereby reducing the concentration of hydrogen in the waste and preventing the hydrogen concentration in the waste from being too high and causing an explosion when it encounters the source of the waste.

[0048] Furthermore, when the synthesis furnace discharges waste gas, the discharge speed will vary due to different production needs. This will cause differences in the speed of the waste gas passing through the flow connection hood 1, altering the rotational speed of the impeller 2 driven by the waste gas. Consequently, the rotational speed of the transmission rod 4 will also change, resulting in a change in the speed of the counterweight slider 6's circular motion. This alters the centrifugal force generated by the counterweight slider 6, causing differences in the stroke of the stop plate 14 under the cooperation of the pulley 12 and the inclined trough 1301. Specifically, when the waste gas flow speed is faster, the impeller 2 rotates faster, and the stop plate 14 has a larger stroke, resulting in a larger area of ​​the guide port. This allows the external nitrogen pumping device to deliver more nitrogen into the annular injection pipe 17, enabling the hydrogen in the waste gas to mix with a specific ratio of nitrogen, thereby reducing the hydrogen content in the waste gas.

[0049] With the above configuration, when the exhaust gas flows through the connecting shroud 1, the rotation of the impeller 2 drives the baffle 14 to move, thus opening the passage. At this time, nitrogen can be delivered to the connecting shroud 1 to mix with the hydrogen in the exhaust gas, thereby reducing the concentration of hydrogen in the exhaust gas and preventing an explosion caused by excessive hydrogen concentration in the exhaust gas upon contact with the source. At the same time, when the exhaust gas flows at a faster speed, the impeller 2 rotates faster, and the stroke of the baffle 14 is also greater, resulting in a larger opening area for the passage. At this time, the external nitrogen pumping device delivers more nitrogen to the annular injection pipe 17, so that the hydrogen in the exhaust gas can be mixed with a specific ratio of nitrogen to reduce the hydrogen content in the exhaust gas, thereby achieving the effect of fire extinguishing.

[0050] The aforementioned bevel gear set 3 includes a first bevel gear fixedly connected to the shaft of the impeller 2 and a second bevel gear meshing with the first bevel gear and rotatably mounted on the connecting cover 1. The second bevel gear is fixedly connected to the transmission rod 4 on the same axis.

[0051] Please see Figure 3 , Figure 4 , Figure 6 , Figure 7 The guiding component is disposed on the connecting cover 1 and connected to the driven component. The guiding component can uniformly guide the mixed gas to the outside when the impeller 2 rotates. The guiding component includes a plurality of guide plates 26 rotatably mounted on the square guide port 101. Each end of the rotating shaft of the guide plate 26 is connected to a follower rod 24. A transverse rod 25 is rotatably mounted on the end of the follower rod 24 away from the guide plate 26.

[0052] The guiding assembly also includes a sway structure connecting the follower rod 24 and the transmission rod 4. The sway structure can drive the follower rod 24 to sway when the transmission rod 4 rotates. The sway structure includes a sway rod 23 fixedly connected to one of the follower rods 24 and a turntable 21 rotatably mounted on the connecting cover 1. The turntable 21 is connected to the transmission rod 4 via a belt 20.

[0053] The turntable 21 and the eccentric rod 23 are connected by a fitting assembly. The fitting assembly includes a connecting groove 2301 arranged along the length of the eccentric rod 23 and a fitting wheel 22 rotatably installed at the eccentric position of the turntable 21. The fitting wheel 22 can roll within the connecting groove 2301.

[0054] When the transmission rod 4 rotates, it drives the turntable 21 to rotate via the belt 20, causing the fitting wheel 22 on the turntable 21 to perform a circular motion. The fitting wheel 22 is slidably disposed in the connecting groove 2301, and the swaying rod 23 is connected to the guide plate 26 via the follower rod 24. When the fitting wheel 22 performs a circular motion, the swaying rod 23 will drive the guide plate 26 to perform a reciprocating swaying motion via the follower rod 24. Each guide plate 26 is provided with a follower rod 24, and multiple follower rods 24 are in a parallel state. At the same time, the transverse rod 25 is parallel to the line connecting the axis of rotation of the guide plate 26, thereby forming multiple parallelograms. This ensures that when one guide plate 26 sways, the guide plate 26 will also sway, so that the exhaust gas and nitrogen can be evenly discharged to the outside after mixing, avoiding the exhaust gas from moving in one direction and causing exhaust gas accumulation, which to a certain extent increases the exhaust gas concentration.

[0055] With the above settings, when exhaust gas is discharged, the guide plate 26 reciprocates and oscillates to evenly discharge the mixture of exhaust gas and nitrogen to the outside, thus playing a guiding role and preventing the mixture of exhaust gas and nitrogen from being discharged to a certain area outside, which would lead to an increase in the concentration of exhaust gas and improve the safety of exhaust gas discharge.

[0056] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0057] Furthermore, it should be understood that 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, and 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 fire extinguishing device for an explosion-proof synthesis furnace that mixes and vents hydrogen gas, characterized in that, include: A connecting cover (1) is connected to the exhaust port of the synthesis furnace, and a square guide opening (101) is formed on the side of the connecting cover (1) away from the synthesis furnace. An annular injection pipe (17) is disposed inside the connecting cover (1) and is coaxial with the connecting cover (1). The annular injection pipe (17) can inject nitrogen into the connecting cover (1). A follower mechanism is provided on the connecting cover (1) and communicates with the annular injection pipe (17). The follower mechanism includes a driven component and an adjusting component. The driven component is connected to an impeller (2) rotatably installed in the connecting cover (1). When exhaust gas flows in the connecting cover (1), the impeller (2) can drive the driven component to move and drive the adjusting component to change the amount of nitrogen introduced into the annular injection pipe (17). A guide component is disposed on the connecting cover (1) and connected to the driven component. The guide component is able to uniformly guide the mixed gas to the outside when the impeller (2) rotates.

2. The explosion-proof synthesis furnace fire extinguishing device for mixed venting of hydrogen gas according to claim 1, characterized in that, The driven component includes a transmission rod (4) rotatably mounted on the connecting cover (1), and the transmission rod (4) is connected to the shaft of the impeller (2) via a bevel gear set (3); A rotating plate (5) is provided on the transmission rod (4). The rotating plate (5) has two sliding grooves (501) along its length. A counterweight slider (6) is slidably installed in the sliding groove (501). The counterweight slider (6) is connected to an elastic structure provided on the transmission rod (4).

3. The explosion-proof synthesis furnace fire extinguishing device for mixed venting of hydrogen gas according to claim 2, characterized in that, The elastic structure includes a lifting sleeve (8) sleeved on the transmission rod (4), and two traction rods (7) are symmetrically and rotatably mounted on the lifting sleeve (8). The end of the traction rod (7) away from the lifting sleeve (8) is rotatably connected to the counterweight slider (6). A cylindrical spring (10) is also fitted on the transmission rod (4). One end of the cylindrical spring (10) is connected to the rotating plate (5), and the other end is connected to the lifting sleeve (8).

4. The explosion-proof synthesis furnace fire extinguishing device for mixed venting of hydrogen gas according to claim 3, characterized in that, The lifting sleeve (8) is connected to the adjusting component via a connecting component; The connecting assembly includes an annular groove formed on the lifting sleeve (8), a collar (9) is rotatably installed in the annular groove, and a horizontal plate (11) is fixedly installed on the collar (9). The horizontal plate (11) is connected to the adjusting assembly through a fitting kit.

5. The explosion-proof synthesis furnace fire extinguishing device for mixed venting of hydrogen gas according to claim 4, characterized in that, The fitting assembly includes a pulley (12) rotatably mounted on the end of the cross plate (11) away from the collar (9) and a drive plate (13) connected to the adjustment assembly. The drive plate (13) is provided with an inclined groove (1301), and the pulley (12) is capable of rolling within the inclined groove (1301).

6. The explosion-proof synthesis furnace fire extinguishing device for mixed venting of hydrogen gas according to claim 5, characterized in that, The adjustment assembly includes an adjustment box (15) disposed on the connecting cover (1), and the adjustment box (15) is connected to the annular injection tube (17) through two conduits (16); The adjustment box (15) is provided with a partition (18), and a guide port is formed on the partition (18). A guide (19) is provided on each side of the guide port. A stop plate (14) that slides and fits against the surface of the partition (18) is slidably installed between the two guides (19). The stop plate (14) passes through the adjustment box (15) and is connected to the drive plate (13).

7. The explosion-proof synthesis furnace fire extinguishing device for mixed and vented hydrogen gas according to claim 2, characterized in that, The guiding assembly includes a plurality of guide plates (26) rotatably mounted on the square guide port (101). Each end of the rotating shaft of the guide plate (26) is connected to a follower rod (24). A transverse rod (25) is rotatably mounted on the end of the follower rod (24) away from the guide plate (26). The guiding assembly also includes a sway structure connecting the follower rod (24) and the transmission rod (4), the sway structure being able to drive the follower rod (24) to sway when the transmission rod (4) rotates.

8. The explosion-proof synthesis furnace fire extinguishing device for mixed venting of hydrogen gas according to claim 7, characterized in that, The oscillating structure includes an oscillating rod (23) fixedly connected to one of the follower rods (24) and a turntable (21) rotatably mounted on the connecting cover (1), the turntable (21) being connected to the transmission rod (4) via a belt (20); The turntable (21) and the eccentric lever (23) are connected by a fitting assembly.

9. The explosion-proof synthesis furnace fire extinguishing device for mixed venting of hydrogen gas according to claim 8, characterized in that, The fitting assembly includes a connecting groove (2301) arranged along the length of the eccentric rod (23) and a fitting wheel (22) rotatably mounted at an eccentric position on the turntable (21), the fitting wheel (22) being able to roll within the connecting groove (2301).

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