Filling device for high-boiling-point aromatic hydrocarbon production

Abstract

The invention relates to the technical field of high-boiling-point aromatic hydrocarbon production, in particular to a filling device for high-boiling-point aromatic hydrocarbon production, which comprises a filling barrel, the side edge of the filling barrel is connected with a blanking pipeline, the upper surface of the blanking pipeline is fixedly connected with a connecting pipe, and the upper surface of the connecting pipe is fixedly connected with a driving motor. A resistance detection mechanism for detecting the viscosity of the high-boiling-point aromatic hydrocarbon is rotationally connected into the connecting pipe. According to the high-boiling-point aromatic hydrocarbon filling device, springback of high-boiling-point aromatic hydrocarbon materials with high concentration and the detection rod can be slowed down, the high-boiling-point aromatic hydrocarbon materials have high viscosity and small flowing inertia, when the high-boiling-point aromatic hydrocarbon materials are close to the filling target amount, the flow speed can be more accurately controlled, and the phenomena of splashing and overflowing of the materials caused by the too high flow speed can be effectively reduced; and moreover, the molecular structure damage, performance change or impurity generation of the product caused by high-speed flowing and violent stirring are avoided, so that the stability and consistency of the product quality are ensured, and the generation of bubbles is prevented.

Description

Technical Field

[0001] This invention relates to the field of high-boiling-point aromatic hydrocarbon production technology, specifically to a filling device for high-boiling-point aromatic hydrocarbon production. Background Technology

[0002] High-boiling-point aromatics, such as aromatic plasticizers, are special petroleum products widely used in rubber production and other fields. They possess advantages such as high boiling points and stable properties, significantly improving the physical, chemical, and processing properties of rubber. With the development of the petroleum processing industry and the continuous improvement of refining technology, high-boiling-point aromatics with various properties can be produced to meet the needs of different industries.

[0003] In the existing technology, precise quantitative filling is often required in the filling process of high-boiling-point aromatics. However, some traditional filling devices are difficult to achieve accurate metering and positioning. Furthermore, the viscosity of high-boiling-point aromatics varies, which leads to different filling effects. If the viscosity is too high and the flow rate is too fast, bubbles will be generated, resulting in a decrease in product quality. Conversely, if the viscosity is too low and the flow rate is too slow, the filling efficiency will be affected. Therefore, it is necessary to control the flow rate of high-boiling-point aromatics by controlling the viscosity to achieve different effects. Summary of the Invention

[0004] The purpose of this invention is to provide a filling device for the production of high-boiling-point aromatics, thereby solving the problems mentioned in the background art. To achieve the above objective, this invention provides the following technical solution: a filling device for the production of high-boiling-point aromatics, comprising a filling tank, a feeding pipe connected to the side of the filling tank, a connecting pipe fixedly connected to the upper surface of the feeding pipe, and a drive motor fixedly connected to the upper surface of the connecting pipe;

[0005] The connecting pipe is rotatably connected to a resistance detection mechanism for detecting the viscosity of high-boiling-point aromatics. The connecting pipe is also equipped with a synchronization mechanism that moves proportionally to the resistance detection mechanism. An auxiliary mechanism is fixedly connected to the connecting pipe. The lower end of the auxiliary mechanism is equipped with a damping mechanism for adjusting the flow rate of high-boiling-point aromatics in the feed pipe.

[0006] Preferably, the resistance detection mechanism includes a spline telescopic rod, which is rotatably connected to the upper end of the connecting tube and fixedly connected to the output end of the drive motor. A telescopic spring is provided between the spline telescopic rod and the connecting tube. A rotating roller is fixedly connected to the surface of the telescopic end of the spline telescopic rod. A circulating groove is formed on the surface of the rotating roller. A limit rod is fixedly connected to the upper end of the connecting tube and is slidably connected inside the circulating groove. A detection rod is fixedly connected to the lower end of the rotating roller. The function of the detection rod is to insert into the flowing high-boiling-point aromatic hydrocarbon during descent and to determine the rebound rate based on the concentration of the high-boiling-point aromatic hydrocarbon during rebound.

[0007] Preferably, the synchronization mechanism includes a double-track slide, which is fixedly connected to the upper end of the inside of the connecting pipe. A sliding block is slidably connected in one of the slides of the double-track slide, and a limit ring is fixedly connected to the lower end of the sliding block. The limit ring is rotatably connected to the surface of the rotating roller, and a spring is provided in the other slide of the double-track slide.

[0008] Preferably, a slider is slidably connected in the other groove of the double-track slide, the slider is disposed at one end of the spring, a spring catch block is slidably connected inside the slider, a push rod is fixedly connected to the side of the slider, an inclined block is fixedly connected to the surface of the double-track slide, the plane of the inclined block is opposite to the push rod, and the inclined surface of the inclined block and the inclined surface of the spring catch block are on the same horizontal line, and a sliding rod is fixedly connected to the lower end of the slider.

[0009] Preferably, the auxiliary mechanism includes an L-shaped fixing plate, which is fixedly connected to the inner wall of the connecting pipe. A circulating track rod is rotatably connected inside the L-shaped fixing plate, and a slanted groove rod is also rotatably connected inside the L-shaped fixing plate. The circulating track rod is sleeved on the surface of the slanted groove rod, and a sliding rod is slidably connected to the slanted groove inside the slanted groove rod. A ratchet is fixedly connected to the inner wall of the circulating track rod, and a pawl is connected to the outer surface of the slanted groove rod. The pawl engages with the ratchet.

[0010] Preferably, the L-shaped fixing plate has a limiting groove fixedly connected inside, and a sliding rod is slidably connected inside the limiting groove. The sliding rod is slidably connected to the surface of the rotating rod of the circulating track.

[0011] Preferably, the damping mechanism includes a long gear, which is rotatably connected inside the L-shaped fixed plate. A connecting rod is fixedly connected inside the connecting tube. The long gear is also rotatably connected to the side of the connecting rod. A gear shift wheel is rotatably connected to the lower end of the side of the connecting rod. A chain is connected between the long gear and the gear shift wheel.

[0012] Preferably, a rectangular slide plate is fixedly connected to the lower end of the sliding lever, a slotted toothed plate is slidably connected inside the rectangular slide plate, a rack is fixedly connected to the side of the slotted toothed plate, a limiting gear is rotatably connected inside the connecting tube, the limiting gear meshes with the inside of the slotted toothed plate, and meshes with the long gear when the rack moves forward and downward synchronously, and the upward speed of the rack determines the rotational speed of the long gear.

[0013] In this invention, the rebound of the detection rod will be slower when the concentration of high-boiling-point aromatic materials is high. High-boiling-point aromatic materials have high viscosity and low flow inertia. When approaching the target filling volume, the flow rate can be controlled more precisely. This can effectively reduce splashing and overflow caused by excessive flow rate, and avoid the destruction of the molecular structure, changes in performance, or the generation of impurities caused by high-speed flow and violent stirring. This ensures the stability and consistency of product quality and prevents the generation of bubbles.

[0014] In this invention, for high-boiling-point aromatic materials with lower concentrations, the detection rod rebounds more quickly, resulting in better flowability. This allows the material to pass through the pipes, valves, and other components of the filling equipment at a faster speed, thus shortening the filling time for a single product. Due to the low material concentration and high flow rate, the pumps, motors, and other power components of the filling equipment do not require excessive pressure and power to propel the material during transport. Compared to high-concentration materials that require greater power, the faster flow rate of low-concentration materials reduces equipment energy consumption, saves energy costs, and also alleviates the operational burden on the equipment.

[0015] In this invention, the detection rod contracts, and the rate of contraction is determined by the concentration of high-boiling-point aromatic hydrocarbons. This process is repeated cyclically. When the concentration of high-boiling-point aromatic hydrocarbons is high, the recovery rate of the detection rod will be slower, while when the concentration of high-boiling-point aromatic hydrocarbons is low, the recovery rate of the detection rod will be faster. Attached Figure Description

[0016] Figure 1 This is a three-dimensional appearance diagram of the present invention;

[0017] Figure 2 This is a side sectional view of the material feeding pipe and connecting pipe of the present invention;

[0018] Figure 3 This is a schematic diagram of the internal structure of the connecting pipe of the present invention;

[0019] Figure 4 This is a schematic diagram of the resistance detection mechanism of the present invention;

[0020] Figure 5 This is an enlarged schematic diagram of the rotating roller structure of the present invention;

[0021] Figure 6 This is a schematic diagram of the synchronization mechanism structure of the present invention;

[0022] Figure 7 This is a partially enlarged schematic diagram of the synchronization mechanism of the present invention;

[0023] Figure 8 This is a schematic diagram of the auxiliary mechanism structure of the present invention;

[0024] Figure 9This is a partially enlarged schematic diagram of the auxiliary mechanism of the present invention;

[0025] Figure 10 This is a schematic cross-sectional view of the side of the rotating rod of the circulating track of the present invention;

[0026] Figure 11 This is a schematic diagram of the damping mechanism structure of the present invention;

[0027] Figure 12 This is a partially enlarged schematic diagram of the damping mechanism of the present invention. Figure 1 ;

[0028] Figure 13 This is a partially enlarged schematic diagram of the damping mechanism of the present invention. Figure 2 .

[0029] In the diagram: 1. Filling barrel; 2. Feeding pipe; 3. Connecting pipe; 4. Drive motor; 5. Resistance detection mechanism; 6. Synchronization mechanism; 7. Auxiliary mechanism; 8. Damping mechanism; 51. Spline telescopic rod; 52. Telescopic spring; 53. Rotating roller; 54. Circulating chute; 55. Limiting rod; 56. Detection rod; 61. Double track chute; 62. Sliding block; 63. Limiting ring; 64. Spring; 65. Sliding block; 66. Spring catch block; 67. Push rod; 68. Inclined block; 69. Sliding rod; 71. L-shaped fixing plate; 72. Circulating track rotating rod; 73. Inclined chute rod; 74. Ratchet; 75. Pawl; 76. Limiting chute; 77. Sliding catch rod; 81. Long gear; 82. Connecting rod; 83. Gear; 84. Rectangular sliding plate; 85. Groove toothed plate; 86. Rack; 87. Limiting gear; 88. Chain. Detailed Implementation

[0030] 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.

[0031] Please see Figures 1 to 13 The present invention provides a technical solution: a filling device for the production of high-boiling-point aromatics, including a filling barrel 1, a feeding pipe 2 connected to the side of the filling barrel 1, a connecting pipe 3 fixedly connected to the upper surface of the feeding pipe 2, and a drive motor 4 fixedly connected to the upper surface of the connecting pipe 3.

[0032] The connecting pipe 3 is rotatably connected to a resistance detection mechanism 5 for detecting the viscosity of high-boiling-point aromatic hydrocarbons. The connecting pipe 3 is also equipped with a synchronization mechanism 6 that moves proportionally to the resistance detection mechanism 5. The connecting pipe 3 is also fixedly connected to an auxiliary mechanism 7. The lower end of the auxiliary mechanism 7 is equipped with a damping mechanism 8 for adjusting the flow rate of high-boiling-point aromatic hydrocarbons in the feed pipe 2.

[0033] The resistance detection mechanism 5 includes a spline telescopic rod 51, which is rotatably connected to the upper end of the connecting pipe 3 and fixedly connected to the output end of the drive motor 4. A telescopic spring 52 is provided between the spline telescopic rod 51 and the connecting pipe 3. A rotating roller 53 is fixedly connected to the surface of the telescopic end of the spline telescopic rod 51. A circulation groove 54 is formed on the surface of the rotating roller 53. A limit rod 55 is fixedly connected to the upper end of the connecting pipe 3 and slides inside the circulation groove 54. A detection rod 56 is fixedly connected to the lower end of the rotating roller 53. The function of the detection rod 56 is to insert into the flowing high-boiling-point aromatic hydrocarbon during descent. During rebound, the rebound rate is determined by the concentration of the high-boiling-point aromatic hydrocarbon. The detection rod 56 contracts, and the contraction speed of the detection rod 56 is determined by the concentration of the high-boiling-point aromatic hydrocarbon. This cycle of detection is repeated. When the concentration of the high-boiling-point aromatic hydrocarbon is high, the recovery rate of the detection rod 56 is slower, and when the concentration of the high-boiling-point aromatic hydrocarbon is low, the recovery rate of the detection rod 56 is faster.

[0034] The synchronization mechanism 6 includes a double-track slide 61, which is fixedly connected to the upper part of the inner side of the connecting pipe 3. A sliding block 62 is slidably connected in one of the slides of the double-track slide 61. A limit ring 63 is fixedly connected to the lower end of the sliding block 62. The limit ring 63 is rotatably connected to the surface of the rotating roller 53. A spring 64 is provided in the other slide of the double-track slide 61. A slider 65 is slidably connected in the other slide of the double-track slide 61. The slider 65 is located at one end of the spring 64. A spring retainer 66 is slidably connected inside the slider 65. A push rod 67 is fixedly connected to the side of the sliding block 62. An inclined block 68 is fixedly connected to the surface of the double-track slide 61. The plane of the inclined block 68 is opposite to the push rod 67, and the inclined surface of the inclined block 68 and the inclined surface of the spring retainer 66 are on the same horizontal line. A sliding rod 69 is fixedly connected to the lower end of the slider 65.

[0035] The auxiliary mechanism 7 includes an L-shaped fixing plate 71, which is fixedly connected to the inner wall of the connecting pipe 3. A circulating track rod 72 is rotatably connected inside the L-shaped fixing plate 71, and a slanted groove rod 73 is also rotatably connected inside the L-shaped fixing plate 71. The circulating track rod 72 is sleeved on the surface of the slanted groove rod 73, and the sliding rod 69 is slidably connected to the slanted groove inside the slanted groove rod 73. A ratchet 74 is fixedly connected to the inner wall of the circulating track rod 72, and a pawl 75 is connected to the outer surface of the slanted groove rod 73. The pawl 75 meshes with the ratchet 74. A limiting groove 76 is fixedly connected inside the L-shaped fixing plate 71, and a sliding locking rod 77 is slidably connected inside the limiting groove 76. The sliding locking rod 77 is slidably connected to the surface of the circulating track rod 72.

[0036] The damping mechanism 8 includes a long gear 81, which is rotatably connected inside the L-shaped fixed plate 71. A connecting rod 82 is fixedly connected inside the connecting tube 3. The long gear 81 is also rotatably connected to the side of the connecting rod 82. A gear shift wheel 83 is rotatably connected to the lower end of the side of the connecting rod 82. A chain 88 is connected between the long gear 81 and the gear shift wheel 83. A rectangular slide plate 84 is fixedly connected to the lower end of the sliding lever 77. A slotted toothed plate 85 is slidably connected inside the rectangular slide plate 84. A rack 86 is fixedly connected to the side of the slotted toothed plate 85. A limiting gear 87 is rotatably connected inside the connecting tube 3. The limiting gear 87 meshes with the inside of the slotted toothed plate 85. When the rack 86 moves forward and downward synchronously, it will mesh with the long gear 81. The upward speed of the rack 86 determines the rotational speed of the long gear 81.

[0037] The method of use and advantages of this invention: The filling device for producing high-boiling-point aromatics operates as follows:

[0038] In use, as high-boiling-point aromatics enter the filling tank 1 through the feeding pipe 2, the drive motor 4 is started. The drive motor 4 drives the spline telescopic rod 51 to rotate intermittently. When the spline telescopic rod 51 rotates, it drives the rotating roller 53 on the surface to rotate. When the rotating roller 53 rotates, the circulating chute 54 is first squeezed by the limiting rod 55, causing the rotating roller 53 to gradually slide downward through the spline telescopic rod 51. When the rotating roller 53 slides downward, it drives the detection rod 56 at the lower end to slide downward and completely enter the high-boiling-point aromatics. At this time, the limiting rod 55 will enter the straight groove in the circulating chute 54. The spline telescopic rod 51 is contracted by the telescopic spring 52, which at the same time drives the detection rod 56 to contract. The contraction speed of the detection rod 56 is determined by the concentration of the high-boiling-point aromatics. This cycle of detection is repeated. When the concentration of high-boiling-point aromatics is high, the recovery rate of the detection rod 56 will be slower, and when the concentration of high-boiling-point aromatics is low, the recovery rate of the detection rod 56 will be faster.

[0039] As the rotating roller 53 and the detection rod 56 move, the rotating roller 53 drives the sliding block 62 to slide downward inside the double track groove 61 through the limiting ring 63. When the sliding block 62 slides, it drives the push rod 67 to slide simultaneously. The push rod 67 first squeezes the inclined surface of the spring block 66 and slides past the spring block 66. When the rotating roller 53 rebounds, it drives the push rod 67 to rebound simultaneously. The push rod 67 pushes the plane of the spring block 66, causing the slider 65 to slide upward inside the double track groove 61. When the slider 65 slides upward, it drives the sliding rod 69 to slide upward simultaneously. When the spring block 66 is squeezed and retracted by the inclined surface of the inclined block 68, it will separate from the push rod 67. Finally, the slider 65 will be reset by the spring 64 and return to the initial state. This will form a reciprocating motion consistent with the detection rod 56.

[0040] When the sliding rod 69 slides upward, it drives the inclined groove rod 73 connected to it to rotate. When the inclined groove rod 73 rotates, it drives the pawl 75 to rotate. At this time, the pawl 75 engages with the ratchet 74, driving the ratchet 74 to rotate. The ratchet 74 simultaneously drives the rotating rod 72 of the circulating track to rotate. When the sliding rod 69 slides downward, the inclined groove rod 73 rotates in the opposite direction, and the ratchet 74 and the pawl 75 cannot engage. The rotating rod 72 of the circulating track cannot rotate. When the rotating rod 72 of the circulating track rotates, it drives the sliding locking rods 77 connected on both sides to slide back and forth alternately inside the limiting slide groove 76. When the sliding locking rods 77 slide upward, they drive the rectangular slide plate 84 to slide upward at the same time. The rectangular slide plate 84 drives the slotted toothed plate 85 to move at the same time. The slotted toothed plate 85 moves. When the sliding lever 77 is stopped by the limiting gear 87, the slotted toothed plate 85 meshes with the limiting gear 87, and the slotted toothed plate 85 drives the limiting gear 87 to rotate. At the same time, the slotted toothed plate 85 moves to the right along its own trajectory through the limiting gear 87. When the sliding lever 77 moves downward, the limiting gear 87 drives the slotted toothed plate 85 to move to the left and downward within the rectangular slide plate 84. The slotted toothed plate 85 drives the rack 86 to operate simultaneously. The rack 86 meshes with the long gear 81, driving the long gear 81 to rotate. When the long gear 81 rotates, it drives the gear shift wheel 83 to rotate through the chain 88. When the sliding lever 77 moves slowly, the speed of the gear shift wheel 83 will slow down, and when the sliding lever 77 moves faster, the speed of the gear shift wheel 83 will increase.

[0041] For high-concentration, high-boiling-point aromatic materials, the rebound of the detection rod 56 is slower. High-boiling-point aromatic materials have high viscosity and low flow inertia, allowing for more precise flow rate control as the target filling volume approaches. This effectively reduces splashing and overflow caused by excessive flow rate and avoids molecular structure damage, performance changes, or impurity generation due to high-speed flow and vigorous agitation, thus ensuring product quality stability and consistency and preventing bubble formation. Conversely, for low-concentration, high-boiling-point aromatic materials, the rebound of the detection rod 56 is faster, indicating better flowability. This allows for quicker passage through the filling equipment's pipes, valves, and other components, shortening the filling time for individual products. Due to the low concentration and high flow rate, the pumps, motors, and other power components of the filling equipment do not require excessive pressure or power to propel the material. Compared to high-concentration materials requiring greater power, the faster flow rate of low-concentration materials reduces energy consumption, saves energy costs, and alleviates the operational burden on the equipment.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A filling device for producing high-boiling-point aromatics, comprising a filling barrel (1), wherein a feeding pipe (2) is connected to the side of the filling barrel (1), a connecting pipe (3) is fixedly connected to the upper surface of the feeding pipe (2), and a drive motor (4) is fixedly connected to the upper surface of the connecting pipe (3). Its features are: The connecting pipe (3) is rotatably connected to a resistance detection mechanism (5) for detecting the viscosity of high-boiling-point aromatic hydrocarbons. The connecting pipe (3) is equipped with a synchronization mechanism (6) that moves proportionally to the resistance detection mechanism (5). The connecting pipe (3) is fixedly connected to an auxiliary mechanism (7). The lower end of the auxiliary mechanism (7) is equipped with a damping mechanism (8) for adjusting the flow rate of high-boiling-point aromatic hydrocarbons in the feed pipe (2).

2. The filling device for producing high-boiling-point aromatics according to claim 1, characterized in that: The resistance detection mechanism (5) includes a spline telescopic rod (51), which is rotatably connected to the upper end of the connecting tube (3) and fixedly connected to the output end of the drive motor (4). A telescopic spring (52) is provided between the spline telescopic rod (51) and the connecting tube (3). A rotating roller (53) is fixedly connected to the telescopic end surface of the spline telescopic rod (51). A circulating groove (54) is opened on the surface of the rotating roller (53). A limiting rod (55) is fixedly connected to the upper end of the connecting tube (3). The limiting rod (55) is slidably connected inside the circulating groove (54). A detection rod (56) is fixedly connected to the lower end of the rotating roller (53).

3. The filling device for producing high-boiling-point aromatics according to claim 2, characterized in that: The synchronization mechanism (6) includes a double track chute (61), which is fixedly connected to the upper end of the inside of the connecting pipe (3). A sliding block (62) is slidably connected in one of the tracks of the double track chute (61). A limit ring (63) is fixedly connected to the lower end of the sliding block (62). The limit ring (63) is rotatably connected to the surface of the rotating roller (53). A spring (64) is provided in the other track of the double track chute (61).

4. The filling device for producing high-boiling-point aromatics according to claim 3, characterized in that: A slider (65) is slidably connected in the other groove of the double track slide (61). The slider (65) is set at one end of the spring (64). A spring block (66) is slidably connected inside the slider (65). A push rod (67) is fixedly connected to the side of the slider block (62). An inclined block (68) is fixedly connected to the surface of the double track slide (61). The plane of the inclined block (68) is opposite to the push rod (67), and the inclined surface of the inclined block (68) and the inclined surface of the spring block (66) are on the same horizontal line. A sliding rod (69) is fixedly connected to the lower end of the slider (65).

5. The filling apparatus for producing high-boiling-point aromatics according to claim 4, characterized in that: The auxiliary mechanism (7) includes an L-shaped fixing plate (71), which is fixedly connected to the inner wall of the connecting pipe (3). A circulating track rotating rod (72) is rotatably connected inside the L-shaped fixing plate (71), and a slanted groove rod (73) is rotatably connected inside the L-shaped fixing plate (71). The circulating track rotating rod (72) is sleeved on the surface of the slanted groove rod (73), and the sliding rod (69) is slidably connected to the slanted groove inside the slanted groove rod (73). A ratchet (74) is fixedly connected to the inner wall of the circulating track rotating rod (72), and a pawl (75) is connected to the outer surface of the slanted groove rod (73). The pawl (75) meshes with the ratchet (74).

6. The filling apparatus for producing high-boiling-point aromatics according to claim 5, characterized in that: The L-shaped fixing plate (71) is fixedly connected to a limiting groove (76), and a sliding rod (77) is slidably connected inside the limiting groove (76). The sliding rod (77) is slidably connected to the surface of the rotating rod (72) of the circulating track.

7. The filling apparatus for producing high-boiling-point aromatics according to claim 6, characterized in that: The damping mechanism (8) includes a long gear (81), which is rotatably connected inside the L-shaped fixed plate (71). A connecting rod (82) is fixedly connected inside the connecting tube (3). The long gear (81) is also rotatably connected to the side of the connecting rod (82). A gear shift wheel (83) is rotatably connected to the lower end of the side of the connecting rod (82). A chain (88) is connected between the long gear (81) and the gear shift wheel (83).

8. The filling apparatus for producing high-boiling-point aromatics according to claim 7, characterized in that: The lower end of the sliding lever (77) is fixedly connected to a rectangular slide plate (84), and a slotted toothed plate (85) is slidably connected inside the rectangular slide plate (84). A rack (86) is fixedly connected to the side of the slotted toothed plate (85). A limiting gear (87) is rotatably connected inside the connecting pipe (3), and the limiting gear (87) meshes with the inside of the slotted toothed plate (85).

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