Portable ultrahigh-temperature sterilized milk automatic canning device

Abstract

The utility model discloses a portable automatic canning device for ultrahigh-temperature sterilized milk, which relates to the technical field of dairy product processing, and comprises a frame body, supporting legs and universal wheels, by arranging a fixing mechanism, a rotating part, a connecting part and a sliding part, a fixed motor is started to drive a fixed shaft to rotate, so that a fixed disc rotates, and a rotating plate is driven to rotate; according to the stirring barrel fixing device, by arranging the rotating block, the rotating block moves, the connecting plate rotationally connected with the first connecting shaft is driven to rotate, the sliding block fixedly connected with the second connecting shaft slides in the sliding groove in the sliding plate, the clamping blocks fixedly connected with the sliding block are driven to get close to each other, and fixing of the stirring barrel is achieved; the height of the filling head can be adjusted, the stirring barrel can be disassembled more quickly and conveniently by arranging the fixing mechanism and the telescopic mechanism, and filling bottles with different heights can be filled with the filling head.

Description

TECHNICAL FIELD

[0001] The utility model relates to dairy processing technical field especially, relate to a kind of portable ultra high temperature sterilization milk automatic canning device. BACKGROUND

[0002] Ultra high temperature sterilization milk automatic canning device is a kind of equipment for automatically filling dairy products subjected to ultra high temperature sterilization under aseptic conditions. This device is usually combined with an ultra high temperature sterilization process, which heats the dairy products to 135-150°C and maintains for a certain period of time to achieve commercial sterility. After sterilization is completed, the dairy products are filled into previously sterilized containers, such as packaging bags made of multi-layer composite materials, under aseptic conditions to ensure that they can be stored for a long time without deterioration at room temperature. The automatic canning device is usually equipped with advanced sensor technology and precise control system, which can automatically adjust the filling amount according to the characteristics of the dairy products, ensuring that each bottle of product meets the precise volume standard, thereby avoiding the errors of manual operation and ensuring the consistency and high quality of the product. In addition, the device also has the ability of efficient production, from raw material processing, blending, sterilization to filling, sealing, detection, the whole process is automated operation, greatly shortening the production cycle and improving the production efficiency.

[0003] According to the search announcement No. "CN221370568U", a kind of dairy filling device is disclosed, including annular table, fixed table, support column, base and dairy filling bottle, fixed table is set in the middle part of annular table, base is set in the lower middle part of fixed table, support column is located between fixed table and base, dairy filling bottle is annularly and equally spacedly set on annular table, further comprising: filling assembly, filling assembly includes the storage cylinder set on the upper side of fixed table and located in the position of one group of dairy filling bottle. Through the mutual cooperation of storage cylinder, material gathering hopper, guide pipe, check valve, injection pipe, sealing plug, push-pull block, threaded rod, threaded sleeve rod, second speed reducer and second driving element, on the one hand, it can replace manual automatic filling of liquid dairy products, on the other hand, it can unify the capacity of injected liquid dairy products; through the mutual cooperation of sleeve ring, return spring, friction pad and extrusion block, the dairy filling bottle in switching process can be effectively clamped and stabilized.

[0004] The scheme can improve the efficiency of filling and fix the filling bottles, but the filling device may be damaged after long-time operation, and thus needs to be maintained and repaired regularly. However, the existing filling device is mostly fixed on the support frame, so that the disassembly of the filling device is cumbersome, affecting the filling efficiency of the dairy product. In addition, different types of filling bottles need to be filled during filling, so the heights of different filling bottles are different. However, the position of the filling head of the scheme is fixed and cannot be adjusted according to the filling bottles of different heights, so improvement is needed. Utility model content

[0005] In view of the defects in the prior art, the utility model aims at providing a portable automatic tank filling device for ultra-high temperature sterilized milk, and aims at solving the above technical problems.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0007] A portable automatic tank filling device for ultra-high temperature sterilized milk, comprising a frame body and a support leg, the support leg is fixedly connected with the frame body, and further comprising:

[0008] A universal wheel is arranged on the support leg and fixedly connected with the support leg.

[0009] A driving motor is fixedly connected with the frame body.

[0010] A driving shaft is detachably fixedly connected with the output end of the driving motor.

[0011] A first driving wheel is fixedly connected with the driving shaft.

[0012] A driving rod is arranged on the frame body and fixedly connected with the frame body.

[0013] A second driving wheel is rotatably connected with the driving rod.

[0014] A driving belt is rotatably matched with the first driving wheel belt wheel and the second driving wheel belt wheel.

[0015] A support frame is arranged on the frame body and fixedly connected with the frame body.

[0016] A stirring barrel is slidably connected with the support frame.

[0017] A stirring motor is arranged on the stirring barrel and fixedly connected with the stirring barrel.

[0018] A stirring shaft is detachably fixedly connected with the output end of the stirring motor.

[0019] The stirring blades are provided on the stirring shaft in a plurality of and are fixedly connected with the stirring shaft;

[0020] The telescopic pipe is fixedly connected with the stirring barrel;

[0021] The filling head is fixedly connected with the telescopic pipe;

[0022] The fixing mechanism is arranged on the support frame and used for fixing the stirring barrel;

[0023] The telescopic mechanism is arranged on the support frame and used for adjusting the height of the filling head.

[0024] Preferably, the fixing mechanism comprises:

[0025] The fixing frame is arranged on the support frame and fixedly connected with the support frame;

[0026] The fixing motor is fixedly connected with the fixing frame;

[0027] The fixing shaft is detachably fixedly connected with the output end of the fixing motor;

[0028] The fixing disc is fixedly connected with the fixing shaft;

[0029] The rotating part is arranged on the fixing disc.

[0030] Preferably, the rotating part comprises:

[0031] The first rotating shaft is eccentrically arranged on the fixing disc and fixedly connected with the fixing disc;

[0032] The rotating plate is rotatably connected with the first rotating shaft;

[0033] The second rotating shaft is rotatably connected with the rotating plate;

[0034] The rotating block is fixedly connected with the second rotating shaft;

[0035] The connecting part is arranged on the rotating block.

[0036] Preferably, the connecting part comprises:

[0037] The first connecting shaft is provided in a plurality of and is fixedly connected with the rotating block;

[0038] The connecting plate is rotatably connected with the first connecting shaft;

[0039] The second connecting shaft is rotatably connected with the connecting plate;

[0040] The sliding part is arranged on the support frame.

[0041] Preferably, the sliding component comprises:

[0042] A sliding plate is arranged on the support frame and fixedly connected with the support frame.

[0043] A sliding groove is arranged on the sliding plate.

[0044] A sliding block is arranged in the sliding groove and slidably connected with the sliding groove and rotatably connected with the second connecting shaft.

[0045] A clamping block is arranged on the sliding block and fixedly connected with the sliding block.

[0046] Preferably, the telescopic mechanism comprises:

[0047] A telescopic plate is arranged on the support frame and fixedly connected with the support frame.

[0048] A telescopic cylinder is fixedly connected with the telescopic plate.

[0049] A telescopic rod is slidably connected with the telescopic cylinder.

[0050] A transmission component is arranged on the telescopic plate.

[0051] Preferably, the transmission component comprises:

[0052] A transmission block is arranged on the telescopic plate and fixedly connected with the telescopic plate.

[0053] A transmission groove is arranged on the transmission block.

[0054] A telescopic block is slidably connected with the transmission groove and fixedly connected with the telescopic rod.

[0055] A transmission plate is fixedly connected with the telescopic block.

[0056] A fixed plate is fixedly connected with the transmission plate and detachably fixedly connected with the filling head.

[0057] A limiting component is arranged on the transmission plate.

[0058] Preferably, the limiting component comprises:

[0059] A plurality of first limiting shafts are arranged on the transmission plate and fixedly connected with the transmission plate.

[0060] A first limiting plate is rotatably connected with the first limiting shaft.

[0061] A second limiting shaft is rotatably connected with the first limiting plate.

[0062] A second limiting plate is rotatably connected with the second limiting shaft.

[0063] The third limiting shaft is rotationally connected with the second limiting shaft and fixedly connected with the telescopic plate.

[0064] In summary, due to the adoption of the above technical solutions, the present application has the following beneficial effects:

[0065] By setting the fixing mechanism, rotating part, connecting part and sliding part, the stirring barrel is fixed, by setting the telescopic mechanism, transmission part and limiting part, the height of the filling head is adjusted, by setting the fixing mechanism and telescopic mechanism, the stirring barrel is disassembled more quickly and conveniently, and the filling head can fill the filling bottles of different heights. BRIEF DESCRIPTION OF DRAWINGS

[0066] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0067] Figure 1 A perspective structural schematic diagram of a portable automatic canning device for sterilizing milk at ultrahigh temperature is shown.

[0068] Figure 2 A top view structural schematic diagram of a portable automatic canning device for sterilizing milk at ultrahigh temperature is shown.

[0069] Figure 3 A cross-sectional structural schematic diagram of A-A in the portable automatic canning device for sterilizing milk at ultrahigh temperature is shown. Figure 2

[0070] Figure 4 An explosion diagram of a fixing mechanism of a portable automatic canning device for sterilizing milk at ultrahigh temperature is shown.

[0071] Figure 5 An explosion diagram of a telescopic mechanism of a portable automatic canning device for sterilizing milk at ultrahigh temperature is shown.

[0072] LEGEND:

[0073] ​1, frame; 2, support leg; 3, universal wheel; 4, drive motor; 5, drive shaft; 6, first drive wheel; 7, drive rod; 8, second drive wheel; 9, drive belt; 10, support frame; 11, stirring barrel; 12, stirring motor; 13, stirring shaft; 14, telescopic pipe; 15, filling head; 16, fixed frame; 17, fixed motor; 18, fixed shaft; 19, fixed disc; 20, first rotating shaft; 21, rotating plate; 22, second rotating shaft; 23, rotating block; 24, first connecting shaft; 25, connecting plate; 26, second connecting shaft; 27, sliding plate; 28, sliding groove; 29, sliding block; 30, clamping block; 31, telescopic plate; 32, telescopic cylinder; 33, telescopic rod; 34, transmission block; 35, transmission groove; 36, telescopic block; 37, transmission plate; 38, fixed plate; 39, first limiting shaft; 40, first limiting plate; 41, second limiting shaft; 42, second limiting plate; 43, third limiting shaft. DETAILED DESCRIPTION

[0074] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0075] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0076] It should be noted that when a component is referred to as "fixed to" another component, it can be directly on the other component or there can be a middle component. When a component is referred to as "connected to" another component, it can be directly connected to the other component or there can be a middle component. When a component is referred to as "provided on" another component, it can be directly provided on the other component or there can be a middle component. The terms "vertical", "horizontal", "left", "right" and the like used herein are for illustrative purposes only.

[0077] In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined as "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "a plurality of" is two or more than two, unless otherwise explicitly specified.

[0078] With reference to Figures 1 to 5 Further description is made to the embodiment of the utility model of the portable ultrahigh temperature sterilization milk automatic canning device.

[0079] A portable ultrahigh temperature sterilization milk automatic canning device, comprising a frame 1 and a support leg 2, the support leg 2 is fixedly connected with the frame 1, further comprising: a universal wheel 3, which is arranged on the support leg 2 and is fixedly connected with the support leg 2; a drive motor 4, which is fixedly connected with the frame 1; a drive shaft 5, which is detachably fixedly connected with the output end of the drive motor 4; a first drive wheel 6, which is fixedly connected with the drive shaft 5; a drive rod 7, which is arranged on the frame 1 and is fixedly connected with the frame 1; a second drive wheel 8, which is rotatably connected with the drive rod 7; a drive belt 9, which is rotatably matched with the first drive wheel 6 and the second drive wheel 8; a support frame 10, which is arranged on the frame 1 and is fixedly connected with the frame 1; a stirring barrel 11, which is slidably connected with the support frame 10; a stirring motor 12, which is arranged on the stirring barrel 11 and is fixedly connected with the stirring barrel 11; a stirring shaft 13, which is detachably fixedly connected with the output end of the stirring motor 12; a plurality of stirring blades 44, which are evenly arranged on the stirring shaft 13 and are fixedly connected with the stirring shaft 13; an extension pipe 14, which is fixedly connected with the stirring barrel 11; a filling head 15, which is fixedly connected with the extension pipe 14; a fixing mechanism, which is arranged on the support frame 10 and is used for fixing the stirring barrel 11; and an extension mechanism, which is arranged on the support frame 10 and is used for adjusting the height of the filling head 15.

[0080] With reference to Figure 4 As a preferred embodiment, the fixing mechanism comprises: a fixing frame 16, which is arranged on the support frame 10 and is fixedly connected with the support frame 10; a fixing motor 17, which is fixedly connected with the fixing frame 16; a fixing shaft 18, which is detachably fixedly connected with the output end of the fixing motor 17; a fixing disc 19, which is fixedly connected with the fixing shaft 18; and a rotating component, which is arranged on the fixing disc 19.

[0081] In this way, when the fixing motor 17 operates, the fixing shaft 18, which is detachably fixedly connected with the output end of the fixing motor 17, is driven to rotate, so that the fixing disc 19, which is fixedly connected with the fixing shaft 18, rotates, thereby providing power for the operation of the rotating component.

[0082] With reference to Figure 4As a preferred embodiment, the rotating component comprises: a first rotating shaft 20, eccentrically arranged on the fixed disc 19 and fixedly connected with the fixed disc 19; a rotating plate 21, rotatably connected with the first rotating shaft 20; a second rotating shaft 22, rotatably connected with the rotating plate 21; a rotating block 23, fixedly connected with the second rotating shaft 22; and a connecting component, arranged on the rotating block 23.

[0083] In this way, the rotating plate 21 rotatably connected with the first rotating shaft 20 rotates, so that the rotating block 23 fixedly connected with the second rotating shaft 22 moves, thereby driving the connecting component to operate.

[0084] Referring to Figure 4 As a preferred embodiment, the connecting component comprises: a first connecting shaft 24, having a plurality of first connecting shafts 24 uniformly arranged on the rotating block 23 and fixedly connected with the rotating block 23; a connecting plate 25, rotatably connected with the first connecting shaft 24; a second connecting shaft 26, rotatably connected with the connecting plate 25; and a sliding component, arranged on the support frame 10.

[0085] In this way, the connecting plate 25 rotatably connected with the first connecting shaft 24 rotates, so that the sliding component operates.

[0086] Referring to Figure 4 As a preferred embodiment, the sliding component comprises: a sliding plate 27, arranged on the support frame 10 and fixedly connected with the support frame 10; a sliding groove 28, formed on the sliding plate 27; a sliding block 29, arranged in the sliding groove 28 and slidably connected with the sliding groove 28, and rotatably connected with the second connecting shaft 26; and a clamping block 30, arranged on the sliding block 29 and fixedly connected with the sliding block 29.

[0087] In this way, the sliding block 29 fixedly connected with the second connecting shaft 26 slides in the sliding groove 28 on the sliding plate 27, so that the clamping block 30 fixedly connected with the sliding block 29 moves closer to each other until the clamping block 30 contacts the surface of the stirring barrel 11, thereby achieving the fixation of the stirring barrel 11.

[0088] Referring to Figure 5 As a preferred embodiment, the telescopic mechanism comprises: a telescopic plate 31, arranged on the support frame 10 and fixedly connected with the support frame 10; a telescopic cylinder 32, fixedly connected with the telescopic plate 31; a telescopic rod 33, slidably connected with the telescopic cylinder 32; and a transmission component, arranged on the telescopic plate 31.

[0089] In this way, the telescopic cylinder 32 drives the telescopic rod 33 slidably connected with the telescopic cylinder 32 to slide away from the telescopic cylinder 32, thereby driving the transmission component to operate.

[0090] Referring to Figure 5, as a preferred embodiment, the transmission part comprises: a transmission block 34 provided on the telescopic plate 31 and fixedly connected with the telescopic plate 31; a transmission groove 35 provided on the transmission block 34; a telescopic block 36 slidably connected with the transmission groove 35 and fixedly connected with the telescopic rod 33; a transmission plate 37 fixedly connected with the telescopic block 36; a fixed plate 38 fixedly connected with the transmission plate 37 and detachably fixedly connected with the filling head 15; a limiting part provided on the transmission plate 37.

[0091] In this way, the transmission plate 37 fixedly connected with the telescopic block 36 is moved, the fixed plate 38 fixedly connected with the transmission plate 37 is moved, the filling head 15 fixedly connected with the fixed plate 38 is moved, and the limiting part is operated.

[0092] Referring to Figure 5 , as a preferred embodiment, the limiting part comprises: a plurality of first limiting shafts 39, which are uniformly provided on the transmission plate 37 and fixedly connected with the transmission plate 37; a first limiting plate 40 rotatably connected with the first limiting shaft 39; a second limiting shaft 41 rotatably connected with the first limiting plate 40; a second limiting plate 42 rotatably connected with the second limiting shaft 41; and a third limiting shaft 43 rotatably connected with the second limiting shaft 41 and fixedly connected with the telescopic plate 31.

[0093] In this way, the first limiting plate 40 rotatably connected with the first limiting shaft 39 is rotated, the second limiting plate 42 rotatably connected with the second limiting shaft 41 is rotated around the axis of the third limiting shaft 43, and the filling head 15 is adjusted.

[0094] Working principle: when the stirring barrel 11 is fixed, the fixing motor 17 is started first, the fixing shaft 18 detachably fixedly connected with the output end of the fixing motor 17 is rotated, the fixing disc 19 fixedly connected with the fixing shaft 18 is rotated, the rotating plate 21 rotatably connected with the first rotating shaft 20 is rotated, the rotating block 23 fixedly connected with the second rotating shaft 22 is moved, the connecting plate 25 rotatably connected with the first connecting shaft 24 is rotated, the sliding block 29 fixedly connected with the second connecting shaft 26 is slid in the sliding groove 28 on the sliding plate 27, the clamping block 30 fixedly connected with the sliding block 29 is moved towards each other, until the clamping block 30 contacts with the surface of the stirring barrel 11, and the stirring barrel 11 is fixed.

[0095] Then, the telescopic cylinder 32 is started, the telescopic rod 33 connected with the telescopic cylinder 32 is driven to slide away from the telescopic cylinder 32, the telescopic block 36 fixedly connected with the telescopic rod 33 slides in the transmission groove 35, the transmission plate 37 fixedly connected with the telescopic block 36 moves, the fixed plate 38 fixedly connected with the transmission plate 37 moves, the filling head 15 fixedly connected with the fixed plate 38 moves, the first limiting plate 40 rotatably connected with the first limiting shaft 39 rotates, the second limiting plate 42 rotatably connected with the second limiting shaft 41 rotates around the third limiting shaft 43, so that the filling head 15 is adjusted.

[0096] The above description of the embodiments enables those skilled in the art to make or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the present application. Thus, the present application is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A portable UHT milk automatic filling device, comprising a frame (1) and supporting legs (2) fixedly connected with the frame (1); characterized in that, Also includes: Universal wheel (3), provided on the support leg (2), fixedly connected with the support leg (2); Driving motor (4), fixedly connected with the frame (1); Driving shaft (5), detachably fixedly connected with the output end of the driving motor (4); First driving wheel (6), fixedly connected with the driving shaft (5); Driving rod (7), provided on the frame (1), fixedly connected with the frame (1); Second driving wheel (8), rotatably connected with the driving rod (7); Driving belt (9), rotatably matched with the first driving wheel (6) and the second driving wheel (8); Support frame (10), provided on the frame (1), fixedly connected with the frame (1); Stirring barrel (11), slidingly connected with the support frame (10); Stirring motor (12), provided on the stirring barrel (11), fixedly connected with the stirring barrel (11); Stirring shaft (13), detachably fixedly connected with the output end of the stirring motor (12); Stirring blades (44), a plurality of, uniformly provided on the stirring shaft (13), fixedly connected with the stirring shaft (13); Telescopic pipe (14), fixedly connected with the stirring barrel (11); Filling head (15), fixedly connected with the telescopic pipe (14); Fixing mechanism, provided on the support frame (10), for fixing the stirring barrel (11); Telescopic mechanism, provided on the support frame (10), for adjusting the height of the filling head (15).

2. A portable UHT milk auto-sterilization and filling device according to claim 1, characterized in that, The fixing mechanism comprises: Fixed frame (16), provided on the support frame (10), fixedly connected with the support frame (10); Fixed motor (17), fixedly connected with the fixed frame (16); Fixed shaft (18), detachably fixedly connected with the output end of the fixed motor (17); Fixed disc (19), fixedly connected with the fixed shaft (18); Rotating part, provided on the fixed disc (19).

3. A portable UHT milk auto-sterilization and filling device according to claim 2, characterized in that, The rotating part comprises: First rotating shaft (20), eccentrically provided on the fixed disc (19), fixedly connected with the fixed disc (19); Rotating plate (21), rotatably connected with the first rotating shaft (20); Second rotating shaft (22), rotatably connected with the rotating plate (21); Rotating block (23), fixedly connected with the second rotating shaft (22); Connecting part, provided on the rotating block (23).

4. A portable UHT milk auto-sterilization and filling device according to claim 3, characterized in that, The connecting part comprises: First connecting shaft (24), a plurality of, uniformly provided on the rotating block (23), fixedly connected with the rotating block (23); Connecting plate (25), rotatably connected with the first connecting shaft (24); Second connecting shaft (26), rotatably connected with the connecting plate (25); Sliding part, provided on the support frame (10).

5. A portable UHT milk auto-sterilization and filling device according to claim 4, characterized in that, The sliding part comprises: Sliding plate (27), provided on the support frame (10), fixedly connected with the support frame (10); Sliding groove (28), opened on the sliding plate (27); The sliding block (29) is arranged in the sliding groove (28) and is in sliding connection with the sliding groove (28) and in rotating connection with the second connecting shaft (26). The clamping block (30) is arranged on the sliding block (29) and is in fixed connection with the sliding block (29).

6. A portable UHT milk auto-sterilization and filling device according to claim 5, characterized in that, The telescopic mechanism comprises: The telescopic plate (31) is arranged on the support frame (10) and is in fixed connection with the support frame (10). The telescopic cylinder (32) is in fixed connection with the telescopic plate (31). The telescopic rod (33) is in sliding connection with the telescopic cylinder (32). The transmission component is arranged on the telescopic plate (31).

7. An automatic portable UHT milk bottling apparatus according to claim 6, characterized in that, The transmission component comprises: The transmission block (34) is arranged on the telescopic plate (31) and is in fixed connection with the telescopic plate (31). The transmission groove (35) is arranged on the transmission block (34). The telescopic block (36) is in sliding connection with the transmission groove (35) and in fixed connection with the telescopic rod (33). The transmission plate (37) is in fixed connection with the telescopic block (36). The fixed plate (38) is in fixed connection with the transmission plate (37) and in detachable fixed connection with the filling head (15). The limiting component is arranged on the transmission plate (37).

8. A portable UHT milk auto-sterilization and filling device according to claim 7, characterized in that, The limiting component comprises: The first limiting shaft (39) is provided in plurality and is arranged on the transmission plate (37) in uniform and in fixed connection with the transmission plate (37). The first limiting plate (40) is in rotating connection with the first limiting shaft (39). The second limiting shaft (41) is in rotating connection with the first limiting plate (40). The second limiting plate (42) is in rotating connection with the second limiting shaft (41). The third limiting shaft (43) is in rotating connection with the second limiting shaft (41) and in fixed connection with the telescopic plate (31).

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