A cigarette packet turning device and a cigarette packet conveyor thereof

Abstract

The application discloses a cigarette packet turning device and a cigarette packet conveyor thereof, and belongs to the field of cigarette packet conveying devices. The cigarette packet turning device comprises a first cigarette packet turning assembly, a turning slide and a second cigarette packet turning assembly. The first cigarette packet turning assembly is arranged at the front side of the turning slide, and the second cigarette packet turning assembly is arranged at the middle part of the turning slide. The first cigarette packet turning assembly and the second cigarette packet turning assembly both comprise a suction belt. The first cigarette packet turning assembly can adsorb the cigarette packet once and convey the cigarette packet on the first cigarette packet turning assembly to the second cigarette packet turning assembly along the turning slide. The second cigarette packet turning assembly can adsorb the cigarette packet conveyed by the first cigarette packet turning assembly twice and make the cigarette packet adsorbed on the second cigarette packet turning assembly slide along the turning slide and be thrown out of the turning slide. After the structure is adopted, the cigarette packet turning device and the cigarette packet conveyor thereof can realize the conversion from the straight movement of the cigarette packet to the horizontal movement, complete the conveying and turning functions of the cigarette packet, and have the simple structure and the high degree of automation.

Description

Technical Field

[0001] This invention relates to machinery and equipment for cigarette packaging production, and more particularly to a cigarette pack turning device and its cigarette pack conveyor. Background Technology

[0002] Chinese patent ZL200620050563.2 discloses a suction cup type cigarette pack conveying and steering device. This device includes two mutually perpendicular conveyor belts, A and B, a top rod, and corresponding transmission mechanisms and control systems. A turret is installed inside the included angle of the conveyor belts. This turret is driven by a drive shaft, and a negative pressure chamber is provided on the turret base. Six rotating shafts, communicating with the negative pressure chamber, are evenly arranged on the top tray. The rotating shafts rotate in the opposite direction as the turret revolves around the turret. Suction cups are installed below the rotating shafts. In operation, when the turret rotates counterclockwise with the drive shaft, the rotating shafts rotate clockwise, and the suction cups maintain a constant direction. When the rotating shafts rotate above the tray, the suction cups are connected to the negative pressure air, sucking up the cigarette packs. After rotating 90° with the turret, the cigarette packs reach the top of conveyor belt B. At this point, the opening of the rotating shaft is misaligned with the air groove, the suction cups lose pressure, and the cigarette packs fall onto conveyor belt B. However, this cigarette pack conveying and steering device has a complex structure and high cost. Summary of the Invention

[0003] To address the above problems, the present invention provides a cigarette pack turning device and a cigarette pack conveyor thereof.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a cigarette pack turning device, including a first cigarette pack turning component, a turning slide, and a second cigarette pack turning component. The first cigarette pack turning component is disposed on the front side of the turning slide, and the second cigarette pack turning component is disposed on the middle part of the turning slide. The first cigarette pack turning component and the second cigarette pack turning component have the same structure. Both the first cigarette pack turning component and the second cigarette pack turning component include a suction belt. The suction belt of the first cigarette pack turning component can adsorb the cigarette pack once and can transport the cigarette pack on it along the turning slide to the second cigarette pack turning component. The suction belt of the second cigarette pack turning component can adsorb the cigarette pack transported by the first cigarette pack turning component a second time and can slide the adsorbed cigarette pack along the turning slide and throw it out of the turning slide.

[0005] Preferably, the steering slide includes a first slide and a second slide that is fastened to the first slide. The second slide is located on the side of the first slide away from the first cigarette pack steering assembly. The second cigarette pack steering assembly is located in the middle of the first slide, and the first cigarette pack steering assembly is located on the front side of the first slide.

[0006] Preferably, the first slide rail is provided with a plurality of air blowing holes.

[0007] Preferably, a first cigarette pack cleaning mechanism is provided on the second slide rail. The first cigarette pack cleaning mechanism includes an anti-blocking plate hinged to the second slide rail, and a handle is provided on the outer side of the anti-blocking plate.

[0008] Preferably, both the first cigarette pack steering assembly and the second cigarette pack steering assembly include a suction chamber, and a driving wheel and a driven wheel are rotatably connected to both sides of the suction chamber, and the driving wheel and the driven wheel are connected by a suction belt.

[0009] Preferably, it also includes a drive motor for driving the suction belt to rotate, and the transmission end of the drive motor is connected to the drive wheel.

[0010] Preferably, the first and second cigarette pack steering assemblies are respectively provided with a second cigarette pack cleaning mechanism. The second cigarette pack cleaning mechanism includes a fixed seat disposed in the steering slide, a movable plate slidably connected in the fixed seat, the first and second cigarette pack steering assemblies being fixed on the movable plate, a limit rod being provided at one end of the movable plate, a hook for fixing the limit rod being provided on the outer side of the fixed seat, and an adjusting rod for driving the hook to rotate being provided on the fixed seat.

[0011] The present invention also provides a cigarette pack conveyor, including a cigarette pressing and conveying assembly. A first cigarette pack turning assembly is mounted on the end of the cigarette pressing and conveying assembly. The turning slide is disposed on one side of the end of the cigarette pressing and conveying assembly, and the first cigarette pack turning assembly is fixed on one side of the turning slide. The cigarette pressing and conveying assembly and the turning slide are perpendicular to each other and are arranged vertically opposite to each other. The cigarette pressing and conveying assembly can separate multiple cigarette packs conveyed therein at a certain distance and transfer the cigarette packs one by one to the first cigarette pack turning assembly in sequence.

[0012] Preferably, the cigarette pack conveying assembly includes an upper conveyor belt and a lower conveyor belt disposed below the upper conveyor belt. The upper and lower conveyor belts are connected by a bracket. An upper rotating roller and a lower rotating roller are rotatably connected to the bracket. The upper conveyor belt passes over the upper rotating roller, and the lower conveyor belt passes over the lower rotating roller. The upper and lower rotating rollers are driven to operate so that the upper and lower conveyor belts can convey the cigarette packs placed between them.

[0013] Preferably, it further includes an adjustment component for adjusting the longitudinal distance between the upper conveyor belt and the lower conveyor belt. The adjustment component includes an upper fixing plate fixedly connected to the upper conveyor belt and a lower fixing plate fixedly connected to the lower conveyor belt. An upper threaded rod is provided on the bottom of the upper fixing plate, and a lower threaded rod is provided on the top of the lower fixing plate. The upper threaded rod and the lower threaded rod are connected by a bidirectional nut.

[0014] As can be seen from the above description of the structure of the present invention, compared with the prior art, the present invention has the following advantages:

[0015] 1. This invention is constructed by combining a first cigarette pack turning component, a turning slide, a second cigarette pack turning component, and a cigarette pressing and conveying component. The cigarette pressing and conveying component separates multiple cigarette packs at a certain distance and sequentially transfers the cigarette packs one after another to the first cigarette pack turning component. The first cigarette pack turning component can then adsorb the cigarette packs once and convey the cigarette packs adsorbed on the first cigarette pack turning component along the turning slide to the second cigarette pack turning component. The second cigarette pack turning component can then adsorb the cigarette packs conveyed from the first cigarette pack turning component a second time and slide the cigarette packs adsorbed on the second cigarette pack turning component along the turning slide and throw them out of the turning slide. This realizes the conversion of the cigarette packs from straight to horizontal movement, completing the cigarette pack conveying and reversing functions. The structure is simple and highly automated.

[0016] 2. This invention, by providing a first cigarette pack cleaning mechanism and a second cigarette pack cleaning mechanism, enables manual cleaning of cigarette packs remaining in the steering slide when the equipment malfunctions or stops unexpectedly, making it highly practical. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a schematic diagram showing that the second cigarette pack steering assembly is separated from and not connected to the steering slide in this invention;

[0020] Figure 3 This is a schematic diagram of the steering slide in this invention;

[0021] Figure 4 This is an exploded view of the first cigarette pack steering assembly in this invention;

[0022] Figure 5 This is a schematic diagram of the structure of the smoke conveying assembly in this invention. Figure 1 ;

[0023] Figure 6 This is a schematic diagram of the structure of the smoke conveying assembly in this invention. Figure 2 .

[0024] In the diagram: 1. First cigarette pack steering assembly; 2. Steering slide rail; 21. First slide rail; 22. Second slide rail; 3. Second cigarette pack steering assembly; 41. Suction belt; 42. Suction chamber; 43. Drive wheel; 44. Driven wheel; 45. Drive motor; 51. Anti-blocking plate; 52. Handle; 61. Fixed base; 62. Moving plate; 63. Limiting rod; 64. Hook; 65. Adjusting rod; 7. Cigarette pressing and conveying assembly; 71. Upper conveyor belt; 72. Lower conveyor belt; 73. Bracket; 74. Upper rotating roller; 75. Lower rotating roller; 76. Gear motor; 81. Upper threaded rod; 82. Lower threaded rod; 83. Double-acting nut; 84. Upper fixed plate; 85. Lower fixed plate; 9. Air blowing hole; 10. Suction pump. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0026] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] Example 1

[0030] refer to Figures 1 to 6A cigarette pack turning device includes a first cigarette pack turning assembly 1, a turning slide 2, and a second cigarette pack turning assembly 3. The first cigarette pack turning assembly 1 is located at the front of the turning slide 2, and the second cigarette pack turning assembly 3 is located in the middle of the turning slide 2. The first cigarette pack turning assembly 1 and the second cigarette pack turning assembly 3 have the same structure, and both include a suction belt 41. The suction belt 41 of the first cigarette pack turning assembly 1 can adsorb the cigarette pack once and transport the cigarette pack on it along the turning slide 2 to the second cigarette pack turning assembly 3. The suction belt 41 of the second cigarette pack turning assembly 3 can adsorb the cigarette pack transported by the first cigarette pack turning assembly 1 a second time, and can slide the adsorbed cigarette pack along the turning slide 2 and throw it out of the turning slide 2. With this structure, by combining the first cigarette pack turning assembly 1, the turning slide 2, and the second cigarette pack turning assembly 3, the conversion of the cigarette pack from straight to horizontal movement is realized, completing the functions of cigarette pack transportation and reversal. The structure is simple and highly automated.

[0031] The steering chute 2 includes a first chute 21 and a second chute 22 securely connected to the first chute 21. The second chute 22 is located on the side of the first chute 21 away from the first cigarette pack steering assembly 1. The second cigarette pack steering assembly 3 is located in the middle of the first chute 21, and the first cigarette pack steering assembly 1 is located on the front side of the first chute 21. The first chute 21 is arc-shaped. With this structure, the first chute 21 is an adsorption chute. The first cigarette pack steering assembly 1 can, under the action of the suction belt 41, move the cigarette pack adsorbed on it along the first chute 21 for a certain distance, and then throw the cigarette pack out. The cigarette pack will slide along the first chute 21 and then be adsorbed again by the suction belt 41 on the second cigarette pack steering assembly 3. It can also move the cigarette pack on it along the second chute 22 for a certain distance, and then throw the cigarette pack out. The thrown-out cigarette pack will slide to the top of the first chute 21 and then slide out along the second chute 22.

[0032] The first slide 21 is provided with several air holes 9. With this structure, the upward air holes can provide a certain amount of thrust to the tobacco pack, so that the tobacco pack can slide to the top of the first slide better, and finally slide smoothly out of the second slide 22.

[0033] A first cigarette pack cleaning mechanism is installed on the second slide rail 22. The first cigarette pack cleaning mechanism includes an anti-blocking plate 51 hinged to the second slide rail 22, and a handle 52 is provided on the outer surface of the anti-blocking plate 51. With this structure, when the cigarette pack is stuck, the handle 52 can be pulled outward, which will cause the anti-blocking plate 51 connected to the handle 52 to open outward. At this time, the cigarette pack stuck in the second slide rail 22 can be removed. This mechanism is highly practical and can be used to manually clean the cigarette pack remaining in the second slide rail 22 when the equipment malfunctions or the machine stops unexpectedly.

[0034] Both the first cigarette pack steering assembly 1 and the second cigarette pack steering assembly 3 include a suction chamber 42. A driving wheel 43 and a driven wheel 44 are rotatably connected to both sides of the suction chamber 42, respectively. The driving wheel 43 and the driven wheel 44 are connected via a suction belt 41. The assembly also includes a drive motor 45 that drives the suction belt 41 to rotate. The transmission end of the drive motor 45 is connected to the driving wheel 43. With this structure, the suction chamber 42 is connected to an external suction pump. In this configuration, the drive motor 45 operates, driving the rotation of the driving wheel 43 connected to it. The driving wheel 43, through the suction belt 41, drives the rotation of the driven wheel 44. With the cooperation of the suction chamber 42, the suction belt 41 can both attract and move the cigarette pack, and can also throw the cigarette pack out.

[0035] The first cigarette pack turning assembly 1 and the second cigarette pack turning assembly 3 are respectively equipped with a second cigarette pack cleaning mechanism. The second cigarette pack cleaning mechanism includes a fixed seat 61 mounted on the first slide rail 21, with a movable plate 62 slidably connected to the fixed seat 61. The first cigarette pack turning assembly 1 and the second cigarette pack turning assembly 3 are respectively fixed to the movable plate 62. A limit rod 63 is provided at one end of the movable plate 62. A hook 64 for fixing the limit rod 63 is provided on the outer side of the fixed seat 61. An adjusting rod 65 for driving the hook to rotate is provided on the fixed seat 61. With this structure, when the equipment malfunctions or unexpectedly stops, causing the cigarette pack to become stuck in the first slide rail 21, a person can easily pry open the adjusting rod 65 to pull open the entire first or second cigarette pack turning assembly. This allows for manual removal of the remaining cigarette pack from the first slide rail 21, making it highly practical.

[0036] Example 2

[0037] refer to Figures 1 to 6A cigarette pack conveyor includes a cigarette pressing and conveying assembly 7, a first cigarette pack turning assembly 1 mounted on the end of the cigarette pressing and conveying assembly 7, a turning slide 2 disposed on one side of the end of the cigarette pressing and conveying assembly 7, and the first cigarette pack turning assembly 1 fixed on one side of the turning slide 2. The cigarette pressing and conveying assembly 7 and the turning slide 2 are perpendicular to each other and are arranged vertically opposite each other. The cigarette pressing and conveying assembly 7 can separate multiple cigarette packs conveyed therein at a certain distance and transfer the cigarette packs one by one to the first cigarette pack turning assembly 1 in sequence.

[0038] The tobacco pack conveying assembly 7 includes an upper conveyor belt 71 and a lower conveyor belt 72 disposed below the upper conveyor belt 71. The upper conveyor belt 71 and the lower conveyor belt 72 are connected by a bracket 73. An upper rotating roller 74 and a lower rotating roller 75 are rotatably connected to the bracket 73. The upper conveyor belt 71 is wound around the upper rotating roller 74, and the lower conveyor belt 72 is wound around the lower rotating roller 75. The upper rotating roller 74 and the lower rotating roller 75 are driven to operate so that the upper conveyor belt 71 and the lower conveyor belt 72 can convey the tobacco packs placed between them. The driving components for operating the upper rotating roller 74 and the lower rotating roller 75 can each employ two geared motors 76. The output shaft of one geared motor 76 is rigidly connected to the upper rotating roller 74, and the output shaft of the other geared motor 76 is rigidly connected to the lower rotating roller 75. Preferably, a pulley one is installed on the roller shaft of the upper rotating roller 74, and a pulley two is installed on the roller shaft of the lower rotating roller 75. The upper pulley one and the lower pulley two are connected by a belt, and a geared motor 76 is fixedly connected to the pulley one. With this structure, the operation of the upper rotating roller 74 and the lower rotating roller 75 can respectively drive the upper conveyor belt 71 and the lower conveyor belt 72 connected to them to rotate in opposite directions, so as to separate multiple packs of cigarettes placed between the upper conveyor belt 71 and the lower conveyor belt 72 at a certain distance and transport them to the first cigarette pack deflecting assembly 1.

[0039] It also includes an adjusting assembly for adjusting the longitudinal distance between the upper conveyor belt 71 and the lower conveyor belt 72. The adjusting assembly includes an upper fixing plate 84 fixedly connected to the upper conveyor belt 71 and a lower fixing plate 85 fixedly connected to the lower conveyor belt 72. An upper threaded rod 81 is provided on the bottom of the upper fixing plate 84, and a lower threaded rod 82 is provided on the top of the lower fixing plate 85. The upper threaded rod 81 and the lower threaded rod 82 are connected by a double-ended nut 83. With this structure, the longitudinal distance between the two upper conveyor belts 71 and the lower conveyor belt 72 can be adjusted, which is beneficial for conveying cigarette packs of different heights.

[0040] Working principle:

[0041] Step 1: The upper rotating roller 74 and the lower rotating roller 75 of the cigarette pressing and conveying assembly 7 rotate so as to drive the upper conveyor belt 71 and the lower conveyor belt 72 connected to them to rotate in opposite directions, so as to separate the multiple cigarette packs placed between the upper conveyor belt 71 and the lower conveyor belt 72 at a certain distance and convey them to the first cigarette pack turning assembly 1.

[0042] Step 2: The drive motor 45 on the first cigarette pack steering assembly 1 operates, driving the rotation of the drive wheel 43 connected to it. The drive wheel 43 drives the rotation of the driven wheel 44 through the suction belt 41. With the cooperation of the suction chamber 42, it can drive the cigarette pack to slide a certain distance along the first slide 21 and then throw the cigarette pack out. The cigarette pack will slide forward along the first slide 21.

[0043] Step 3: The cigarette pack sliding forward along the first slide 21 will be sucked up again by the suction belt 41 on the second cigarette pack turning component 3, and the cigarette pack on it will slide a certain distance along the second slide 22, and then be thrown out. The thrown-out cigarette pack will slide to the top of the first slide 21, and then slide out along the second slide 22, so as to realize the conversion of the cigarette pack from straight to horizontal, and complete the cigarette pack conveying and reversing functions. The structure is simple and highly automated.

[0044] It should be noted that all electrical components mentioned in this application are connected to an external power supply and control system. The control system adopts the structure of the prior art and can be equipped with buttons such as switches. The control system is used to control the operation of the drive motor 45, the geared motor 76 and the suction pump 10.

[0045] 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 within the protection scope of the present invention.

Claims

1. A cigarette pack steering device, characterized in that: The assembly includes a first cigarette pack steering component (1), a steering slide (2), and a second cigarette pack steering component (3). The first cigarette pack steering component (1) is located on the front side of the steering slide (2), and the second cigarette pack steering component (3) is located on the middle part of the steering slide (2). The first cigarette pack steering component (1) and the second cigarette pack steering component (3) have the same structure. Both the first cigarette pack steering component (1) and the second cigarette pack steering component (3) include a suction belt (41). The suction belt (41) of the first cigarette pack steering component (1) can adsorb the cigarette pack once and can transport the cigarette pack on it along the steering slide (2) to the second cigarette pack steering component (3). The suction belt (41) of the second cigarette pack steering component (3) can adsorb the cigarette pack transported by the first cigarette pack steering component (1) a second time and can slide the adsorbed cigarette pack along the steering slide (2) and throw it out of the steering slide (2).

2. The cigarette pack steering device according to claim 1, characterized in that: The steering slide (2) includes a first slide (21) and a second slide (22) that is fastened to the first slide (21). The second slide (22) is located on the side of the first slide (21) away from the first cigarette pack steering assembly (1). The second cigarette pack steering assembly (3) is located in the middle of the first slide (21). The first cigarette pack steering assembly (1) is located on the front side of the first slide (21).

3. A cigarette pack steering device according to claim 2, characterized in that: The first slide (21) is provided with several air holes (9).

4. A cigarette pack steering device according to claim 2, characterized in that: The second slide (22) is provided with a first cigarette pack cleaning mechanism, which includes an anti-blocking plate (51) hinged to the second slide (22), and a handle (52) is provided on the outer side of the anti-blocking plate (51).

5. A cigarette pack steering device according to claim 1, characterized in that: The first cigarette pack steering assembly (1) and the second cigarette pack steering assembly (3) both include a suction chamber (42). A driving wheel (43) and a driven wheel (44) are rotatably connected to both sides of the suction chamber (42). The driving wheel (43) and the driven wheel (44) are connected by a suction belt (41).

6. A cigarette pack steering device according to claim 5, characterized in that: It also includes a drive motor (45) that drives the suction belt (41) to rotate, and the transmission end of the drive motor (45) is connected to the drive wheel (43).

7. A cigarette pack steering device according to claim 5, characterized in that: The first cigarette pack steering assembly (1) and the second cigarette pack steering assembly (3) are respectively provided with a second cigarette pack cleaning mechanism. The second cigarette pack cleaning mechanism includes a fixed seat (61) provided in the steering slide (2). A movable plate (62) is slidably connected in the fixed seat (61). The first cigarette pack steering assembly (1) and the second cigarette pack steering assembly (3) are respectively fixed on the movable plate (62). A limit rod (63) is provided on one end of the movable plate (62). A hook (64) for fixing the limit rod (63) is provided on the outer side of the fixed seat (61). An adjusting rod (65) for driving the hook (64) to rotate is provided on the fixed seat (61).

8. A tobacco pack conveyor with a tobacco pack turning device according to any one of claims 1-7, characterized in that: The assembly includes a cigarette pressing and conveying component (7), a first cigarette pack turning component (1) mounted on the end of the cigarette pressing and conveying component (7), a turning slide (2) located on one side of the end of the cigarette pressing and conveying component (7), and the first cigarette pack turning component (1) fixed on one side of the turning slide (2). The cigarette pressing and conveying component (7) and the turning slide (2) are perpendicular to each other and are arranged vertically opposite to each other. The cigarette pressing and conveying component (7) can separate multiple cigarette packs conveyed therein at a certain distance and transfer the cigarette packs one by one to the first cigarette pack turning component (1) in sequence.

9. A tobacco package conveyor according to claim 8, characterized in that: The cigarette pack conveying assembly (7) includes an upper conveyor belt (71) and a lower conveyor belt (72) disposed below the upper conveyor belt (71). The upper conveyor belt (71) and the lower conveyor belt (72) are connected by a bracket (73). An upper rotating roller (74) and a lower rotating roller (75) are rotatably connected to the bracket (73). The upper conveyor belt (71) passes around the upper rotating roller (74), and the lower conveyor belt (72) passes around the lower rotating roller (75). The upper rotating roller (74) and the lower rotating roller (75) are driven to operate so that the upper conveyor belt (71) and the lower conveyor belt (72) can convey the cigarette pack placed between them.

10. A cigarette pack conveyor according to claim 9, characterized in that: It also includes an adjustment assembly for adjusting the longitudinal distance between the upper conveyor belt (71) and the lower conveyor belt (72). The adjustment assembly includes an upper fixing plate (84) fixedly connected to the upper conveyor belt (71) and a lower fixing plate (85) fixedly connected to the lower conveyor belt (72). An upper threaded rod (81) is provided on the bottom of the upper fixing plate (84), and a lower threaded rod (82) is provided on the top of the lower fixing plate (85). The upper threaded rod (81) and the lower threaded rod (82) are connected by a double-ended nut (83).

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