Novel forestry engineering nursery stock storage device
By introducing self-locking universal wheels and drainage holes into the forestry engineering seedling storage device, and optimizing the position control structure of the movable guard plate and fixed vertical plate, the convenience of inserting, removing and cleaning of soil at the root of seedlings is solved. , improves seedling storage and transplant efficiency, ensures soil moisture and seedling survival rate.
Patent Information
- Application Number
- CN202421077432.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-17
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-05-17
AI Technical Summary
In the existing forestry engineering seedling storage device, the storage trough structure of the seedling seedlings is relatively fixed, which makes it difficult to quickly insert and remove the soil lumps at the root of the seedlings, reducing the transplant efficiency and making it difficult to clean the remaining soil lumps, which has the problem of inconvenience in operation.
A new forestry engineering seedling storage device including base plate, water connection plate, fixed vertical plate, movable guard plate, control shaft, drive gear plate and fastening buckle ring is designed, which is improved by self-locking universal wheel and drainage hole. Convenient movement and soil moisture management, easy to open and close the movable guard plate and fixed vertical plate to operate, making it convenient to quickly place, remove and clean the soil.
It improves the efficiency of seedling storage and transplantation, avoids root exposure caused by loose soil lumps, ensures reasonable soil moisture, prevents root rot, and simplifies the soil cleaning operation, and improves the survival rate of seedlings storage.
Smart Images

Figure CN222292398U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the forestry field, in particular to a novel forestry engineering seedling storage device. Background Art
[0002] The existing patent (Announcement No.: CN210942838U) proposes a storage device for forestry engineering seedlings, including a storage box and a movable plate arranged in the storage box, and a plurality of circular placement grooves are equidistantly provided on both sides of the top of the movable plate, and a placement table for placing the seedlings is flexibly arranged in the placement groove. The utility model is a storage device for forestry engineering seedlings. When placing the seedlings, the single-phase motor drives the screw rod to rotate, and the self-rotation of the screw rod drives the threaded cylinder connected to it to move upward along the screw rod, and the movement of the threaded cylinder pushes the movable plate upward to push the placement groove to the top of the storage box cavity. However, in this device, "the top of the placement table is equidistantly provided with a plurality of placement grooves for placing seedlings and seedlings in the circumferential direction", and because the placement groove structure is relatively fixed, it is not convenient to quickly and completely place and remove the soil at the root of the seedlings, which reduces the efficiency of seedling transplantation. Moreover, after the seedlings are transplanted, it is inconvenient to clean the remaining soil in the placement groove, which has disadvantages. Summary of the invention
[0003] In view of the above-mentioned deficiencies in the prior art, the utility model provides a novel storage device for forestry engineering seedlings which is easy to move, convenient for seedling transplantation and transfer, and for storing and protecting the soil at the roots of forestry engineering seedlings to prevent the soil from becoming loose and causing the seedling roots to be exposed. The opening and closing control operation between the movable guard plate and the fixed vertical plate is convenient, which facilitates the rapid and complete placement and removal of the soil at the roots of the seedlings, thereby improving the efficiency of seedling storage and transplantation. When the movable guard plate and the fixed vertical plate are in an open state, it is convenient to quickly clean up the broken soil remaining on the bottom plate. The storage device is easy to operate.
[0004] The purpose of this utility model is achieved through the following technical solutions:
[0005] A novel forestry engineering seedling storage device comprises a bottom plate, a water receiving tray, a fixed vertical plate, a movable guard plate, a position control shaft rod, a driving gear plate, a driven gear plate, and a fastening buckle ring. The bottom plate has a plurality of drainage holes, and mounting sleeves are provided on both sides of the bottom plate. The mounting sleeves are connected to the water receiving tray through threads. The bottom plate has a plurality of fixed support blocks at the bottom, and the fixed support blocks are connected to self-locking universal wheels. Push rods are connected on both sides of the bottom plate. The upper part of the bottom plate has a fixed vertical plate, and the two sides of the fixed vertical plate are connected to the movable guard plate. The lower part of the movable guard plate fits the bottom plate, and the movable guard plate is connected to the bottom plate. The dynamic guard plate has a connecting block, and connecting ears are provided on both sides of the fixed vertical plate. The inner sides of the connecting ears fit the connecting block. The connecting ears are divided into upper connecting ears and lower connecting ears. The control shaft rod is connected to the upper connecting ears and the connecting block in sequence. There are control convex blocks on both sides of the connecting block, and there are control grooves on both sides of the control shaft rod. The control convex blocks are adapted to the control grooves, and the control convex blocks are connected to the control grooves. The lower end of the control shaft rod is provided with a supporting convex rod, and the supporting convex rod is connected to the lower connecting ear. The upper end of the control shaft rod is provided with a controlling circular plate, and the controlling circular plate fits the upper connecting ear.
[0006] The upper connecting ear of the utility model is provided with a fastening support sleeve on the upper part, the inner side of the fastening support sleeve is fitted with a positioning control circular plate, the outer side of the fastening support sleeve is connected to a fastening buckle, the inner side of the fastening buckle is provided with a fastening clamping plate, the fastening support sleeve has clamping plate through holes on both sides, the positioning control circular plate has a fastening clamping groove, the fastening clamping groove and the clamping plate through holes are adapted to the fastening clamping plate, the fastening clamping plate passes through the clamping plate through holes, the fastening clamping plate is connected to the fastening clamping groove, and the fastening clamping groove has a plurality of positioning lock grooves.
[0007] The fastening buckle described in the utility model is divided into an outer fastening buckle and an inner fastening buckle. The outer fastening buckle is connected to the inner fastening buckle. The inner fastening buckle is provided with a fixed support plate on the outside. The lower part of the fixed support plate fits the upper connecting ear. The upper part of the fixed support plate is connected to the cover plate. The lower part of the cover plate fits the upper limit stopper. The lower part of the upper limit stopper is provided with a driving gear plate. The upper part of the upper limit stopper is provided with a driving shaft rod. The driving shaft rod passes through the cover plate, and the driving shaft rod is connected to the rotating wheel. The rotating wheel fits the cover plate. Beneficial Effects
[0008] The fixed vertical plate and the movable guard plate of the utility model are wrapped around the outside of the soil ball of the seedlings in the forestry project to store and protect the soil at the roots of the seedlings, so as to prevent the soil ball from becoming loose and causing the root system of the seedlings to be exposed. The fixed vertical plate and the movable guard plates on both sides are connected by a position control shaft rod, and the opening and closing control are convenient, which facilitates the rapid and complete placement and removal of the soil ball at the roots of the seedlings, thereby improving the efficiency of seedling storage and transplantation. When the movable guard plate and the fixed vertical plate are in an open state, it is convenient to quickly clean up the broken soil remaining on the bottom plate, and the operation is convenient.
[0009] The utility model discloses a plurality of groups of self-locking universal wheels are arranged at the bottom of the bottom plate, which cooperate with the push rods on both sides to increase the overall mobility of the device and the efficiency of storing and transferring forestry seedlings. The structure is flexible and the excess water stored in the soil ball of seedlings after watering can be discharged by adding drainage holes, so that the soil can maintain a reasonable humidity and prevent the roots of the seedlings from being soaked by excessive water, causing root rot, thereby ensuring the survival rate of the stored engineering seedlings. The excess water can be collected through the water collecting tray to prevent the water from flowing freely and causing pollution. The water collecting tray is fixedly connected to the installation support sleeve by a thread, which is convenient to install and disassemble and easy to operate.
[0010] The utility model discloses a kind of invention, and the utility model discloses a kind of invention, and the utility model discloses a kind of invention, and the utility model discloses a kind of invention, and the utility model discloses a kind of invention, and the utility model discloses a kind of invention, and the utility model discloses a kind of invention, and the utility model discloses a kind of invention, and the utility model discloses a kind of invention, and the utility model discloses a kind of invention, and the utility model discloses a kind of invention, and the utility model discloses a kind of invention, and the utility model discloses a kind of invention, and the utility model discloses a kind of invention, and the utility model discloses a kind of invention, and the utility model discloses a kind of invention, and the utility model discloses a kind of invention, and the utility model discloses a kind of invention, The control circular plate is positioned at the fulcrum. At this time, the control circular plate is braked and locked, and the control shaft rod is plugged into the connecting block. The movable guard plate is unable to rotate due to the force, so it is convenient to position and support it in two different usage states: opening it outward or closing it inward. This can ensure the stability of the movable guard plate on the outside of the seedling soil lump, and can also prevent the movable guard plate in an open and closed state from rotating due to the influence of wind during the storage or transplantation of seedlings. The structure is reasonable, and when the positioning lock block is driven to move to completely disengage from the positioning lock groove by rotating the rotating wheel in the opposite direction, the positioning fulcrum of the control circular plate by the fastening card plate disappears. At this time, the movable guard plate can be opened and closed according to actual usage needs, and the structure is flexible.
[0011] The utility model is easy to move, convenient for transplanting and transferring seedlings, and stores and protects the soil at the roots of forestry engineering seedlings to prevent the soil from becoming loose and causing the roots of the seedlings to be exposed. The opening and closing control operation between the movable guard plate and the fixed vertical plate is convenient, which is convenient for quickly and completely placing and removing the soil at the roots of the seedlings, thereby improving the efficiency of seedling storage and transplanting. When the movable guard plate and the fixed vertical plate are in an open state, it is convenient to quickly clean up the broken soil remaining on the bottom plate, and the operation is convenient. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is a schematic structural diagram of the novel forestry engineering seedling storage device described in the utility model.
[0013] Figure 2 It is a schematic structural diagram of the movable guard plate of the utility model in an open state.
[0014] Figure 3 This is a structural cross-sectional view of the novel forestry engineering seedling storage device described in the utility model.
[0015] Figure 4 This is a cross-sectional view of the connection structure of the bottom plate and the water receiving tray described in the utility model.
[0016] Figure 5 This is a cross-sectional view of the connection structure of the fixed vertical plate and the movable guard plate described in the utility model.
[0017] Figure 6 It is a schematic diagram of the positioning structure of the position-control circular plate described in the utility model.
[0018] Figure 7 This is a schematic diagram of the bottom plate structure described in the utility model.
[0019] Figure 8 This is a schematic diagram of the position control shaft structure described in the utility model.
[0020] Fig. 9 This is a schematic diagram of the fastening buckle structure described in the utility model.
[0021] Fig.10 This is a cross-sectional view of the positioning structure of the control circular plate described in the utility model.
[0022] Fig.11 It is an exploded view of the positioning lock block control structure described in the utility model.
[0023] Fig.12 For the utility model Figure 5 A magnified view of the local structure. DETAILED DESCRIPTION
[0024] The utility model is further described in detail below according to the accompanying drawings and embodiments:
[0025] Embodiment 1:
[0026] A novel forestry engineering seedling storage device includes a bottom plate 01, a water receiving tray 05, a fixed vertical plate 08, a movable guard plate 09, a position control shaft 14, a driving gear plate 17, a driven gear plate 18, and a fastening buckle 23. The bottom plate 01 has a plurality of drainage holes 04, and both sides of the bottom plate 01 have mounting sleeves 06, which are connected to the water receiving tray 05 through threads. The bottom of the bottom plate 01 has a plurality of fixed support blocks 02, which are connected to the self-locking universal wheels 03, and both sides of the bottom plate 01 have a plurality of fixed support blocks 02. The fixed support blocks 02 are connected to the self-locking universal wheels 03. Connecting push rod 07, the bottom of the bottom plate 01 is provided with multiple sets of self-locking universal wheels 03, which cooperate with the push rods 07 on both sides to increase the overall mobility of the device, improve the efficiency of forestry seedling storage and transfer, and have a flexible structure. By adding drainage holes 04, the excess water stored in the seedling soil after watering is discharged, so that the soil maintains a reasonable humidity, prevents excessive water from soaking the seedling roots and causing root rot, and ensures the survival rate of engineering seedlings. The excess water discharged is collected through the water tray 05. The water collecting tray 05 is fixedly connected with the mounting support sleeve 06 through a thread, which is convenient for installation and disassembly and easy to operate. The upper part of the bottom plate 01 is provided with a fixed vertical plate 08, and the two sides of the fixed vertical plate 08 are connected with movable guard plates 09. The lower part of the movable guard plate 09 fits the bottom plate 01. The movable guard plate 09 has a connecting block 10. The two sides of the fixed vertical plate 08 are provided with connecting ears 11. The inner side of the connecting ear 11 fits the connecting block 10. The connecting ear 11 is divided into an upper connecting ear 111 and a lower connecting ear 112. The connecting ear 112 and the control shaft rod 14 are connected to the upper connecting ear 111 and the connecting block 10 in sequence. The connecting block 10 has control protrusions 12 on both sides, and the control shaft rod 14 has control grooves 13 on both sides. The control protrusions 12 are adapted to the control grooves 13, and the control protrusions 12 are connected to the control grooves 13. The lower end of the control shaft rod 14 has a supporting protrusion 15, and the supporting protrusion 15 is connected to the lower connecting ear 112. The upper end of the control shaft rod 14 has a controlling circular plate 16, and the controlling circular plate 16 fits the upper connecting ear 111.
[0027] Embodiment 2:
[0028] The upper connecting ear 111 of the utility model has a fastening support sleeve 22 on the upper part, the inner side of the fastening support sleeve 22 fits the control circular plate 16, the outer side of the fastening support sleeve 22 is connected to the fastening buckle 23, the inner side of the fastening buckle 23 has a fastening card plate 28, the fastening support sleeve 22 has card plate perforations 30 on both sides, the control circular plate 16 has a fastening card slot 29, the fastening card slot 29 and the card plate perforations 30 are adapted to the fastening card plate 28, the fastening card plate 28 passes through the card plate perforations 30, the fastening card plate 28 is connected to the fastening card slot 29, and the fastening card slot 29 has a plurality of positioning lock slots 21. The fixed vertical plate 08 and the movable guard plate 09 are wrapped around the outside of the soil ball of the forestry engineering seedlings to store and protect the soil at the roots of the seedlings, so as to prevent the soil ball from loosening and causing the root system of the seedlings to be exposed. The fixed vertical plate 08 and the movable guard plates 09 on both sides are connected by a position control shaft rod 14, which is convenient for opening and closing, and is convenient for quickly and completely placing and removing the soil ball at the roots of the seedlings, thereby improving the efficiency of seedling storage and transplantation. When the movable guard plate 09 and the fixed vertical plate 08 are open, it is convenient to quickly clean up the broken soil remaining on the bottom plate 01, and the operation is convenient.
[0029] Embodiment 3:
[0030] The fastening buckle 23 of the utility model is divided into an outer fastening buckle 231 and an inner fastening buckle 232. The outer fastening buckle 231 is connected to the inner fastening buckle 232. The inner fastening buckle 232 has a fixed support plate 24 on the outside. The lower part of the fixed support plate 24 fits the upper connecting ear 111. The upper part of the fixed support plate 24 is connected to the cover plate 25. The lower part of the cover plate 25 fits the upper limit stopper 31. The lower part of the upper limit stopper 31 has a driving gear plate 17. The upper part of the upper limit stopper 31 has a driving shaft 26. The driving shaft 26 passes through the cover plate 25. The driving shaft 26 passes through the cover plate 25. 6 is connected to the rotating wheel 27, and the rotating wheel 27 is fitted with the cover plate 25. This device is easy to move, convenient for seedling transplantation and transfer, and stores and protects the soil at the roots of forestry engineering seedlings to avoid loose soil lumps that cause the seedling roots to be exposed. The opening and closing control operation between the movable guard plate 09 and the fixed vertical plate 08 is convenient, which is convenient for the quick and complete placement and removal of the soil lumps at the roots of the seedlings, while improving the efficiency of seedling storage and transplantation. When the movable guard plate 09 and the fixed vertical plate 08 are open, it is convenient to quickly clean the broken soil remaining on the bottom plate 01, and the operation is convenient.
[0031] Embodiment 4:
[0032] The driving gear plate 17 of the utility model is meshed with the driven gear plate 18, the driving gear plate 17 is connected to the driven gear plate 18, the driven gear plate 18 has a lower limit stopper 32, the lower limit stopper 32 is fitted with the inner fastening buckle 232, the lower limit stopper 32 has a limit card slot 34, the lower part of the cover plate 25 has a limit card plate 33, the limit card plate 33 is adapted to the limit card slot 34, the limit card plate 33 is connected to the limit card slot 34, the lower limit stopper 32 has a threaded support rod 19, the threaded support rod 19 is threadedly connected to the inner positioning lock block 20 The outer part of the positioning lock block 20 is fitted with the fastening card plate 28, the positioning lock block 20 is adapted to the positioning lock groove 21, the positioning lock block 20 is connected to the positioning lock groove 21, and the fastening buckles 23 on both sides are oppositely buckled and fixed to the outer part of the fastening support sleeve 22. The fastening card plate 28 on the inner side increases the connection fulcrum between the fastening support sleeve 22 and the control circular plate 16, and limits the position of the control shaft rod 14 to keep its longitudinal height unchanged, and perform axial rotation adjustment to prevent it from disengaging and moving, affecting the stability of the control connection between the fixed vertical plate 08 and the movable guard plate 09. The inner fastening buckle 232 is connected to the cover plate 25 to provide an installation fulcrum for the positioning lock block 20 driving assembly, and the driving gear plate 17 and the driven gear plate 18 cooperate to drive the positioning lock block 20. When the positioning lock block 20 is driven to move to the position where it is embedded in the positioning lock groove 21 by rotating the rotating wheel 27, the fastening card plate 28 can be added to the positioning fulcrum of the control circular plate 16. At this time, the control circular plate 16 is braked and locked, and the control shaft rod 14 is plugged into the connecting block 10, and the movable guard plate 09 is forced to be unable to rotate, which is convenient for it to be moved to the The two different usage states of opening on the outside or closing on the inside for positioning and supporting can ensure the stability of the movable guard plate 09 in enclosing the outside of the seedling soil ball, and can also prevent the movable guard plate 09 in an open and closed state from rotating due to the influence of wind during the storage or transplantation of seedlings. The structure is reasonable, and when the positioning lock block 20 is driven to move to completely disengage from the positioning lock groove 21 by rotating the rotating wheel 27 in the opposite direction, the positioning fulcrum of the control circular plate 16 by the fastening clamping plate 28 disappears. At this time, the movable guard plate 09 can be opened and closed according to actual usage needs, and the structure is flexible.
[0033] Embodiment 5:
[0034] Installation steps: First, assemble the inner fastening buckle 232 structure, first place the driven gear plate 18 into the fixed support plate 24, and place the threaded support rod 19 into the fastening card plate 28, until the inner surface of the lower limit stopper 32 fits with the outer surface of the inner fastening buckle 232, then place the driving gear plate 17 under the cover plate 25, and the upper surface of the upper limit stopper 31 fits with the lower surface of the cover plate 25, the driving shaft 26 passes through the cover plate 25, and then place the rotating wheel 27. The cover plate 25 is fixedly connected to the driving shaft 26, the lower surface of the rotating wheel 27 is fitted with the upper surface of the cover plate 25, and the cover plate 25 is then installed and fixed to the upper part of the fixed support plate 24, and the driving gear plate 17 is meshed with the driven gear plate 18, the limiting card plate 33 is embedded in the limiting card groove 34, and finally the positioning lock block 20 is placed in the fastening card plate 28, and the positioning lock block 20 is sleeved on the outside of the threaded support rod 19 and is positioned and connected thereto through threads, and the After the inner fastening buckle 232 structure is assembled, the movable guard plate 09 structure is assembled. The movable guard plate 09 is first placed on both sides of the fixed vertical plate 08, and the lower surface of the movable guard plate 09 is in contact with the upper surface of the bottom plate 01. The connecting block 10 is embedded in the connecting ear 11, and then the control shaft rod 14 is connected to the upper connecting ear 111 and the connecting block 10 from top to bottom in sequence until the supporting protruding rod 15 is inserted into the lower connecting ear 112, and the lower surface of the control circular plate 16 is in contact with the upper connecting ear 1 11, the upper surface is fitted, the fastening slot 29 corresponds to the position of the card plate through hole 30, and then the fastening buckle 23 is placed outside the fastening support sleeve 22, and the fastening buckles 23 on both sides are oppositely buckled and fixedly connected, the fastening card plate 28 passes through the card plate through hole 30 and is embedded in the fastening slot 29, the positioning lock block 20 corresponds to the positioning lock slot 21, and finally, by rotating the rotating wheel 27, the positioning lock block 20 is driven to move to its embedded positioning lock slot 21 to complete the installation.
[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as within the protection scope of the present invention.
Claims
1. A new type of forestry engineering seedling storage device, characterized by : It comprises a bottom plate (01), a water receiving tray (05), a fixed vertical plate (08), a movable guard plate (09), a position control shaft rod (14), a driving gear plate (17), a driven gear plate (18), and a fastening buckle (23), wherein the bottom plate (01) has a plurality of drainage holes (04), both sides of the bottom plate (01) have mounting sleeves (06), the mounting sleeves (06) are connected to the water receiving tray (05) through threads, the bottom of the bottom plate (01) has a plurality of fixed support blocks (02), the fixed support blocks (02) are connected to the self-locking universal wheels (03), both sides of the bottom plate (01) are connected to push rods (07), the top of the bottom plate (01) has a fixed vertical plate (08), both sides of the fixed vertical plate (08) are connected to the movable guard plate (09), the lower part of the movable guard plate (09) is attached to the bottom plate (01), and the movable guard plate (09) has a connecting block ( 10), the fixed vertical plate (08) has connecting ears (11) on both sides, the inner sides of the connecting ears (11) are fitted with the connecting block (10), the connecting ears (11) are divided into an upper connecting ear (111) and a lower connecting ear (112), the control shaft rod (14) is connected to the upper connecting ear (111) and the connecting block (10) in sequence, the connecting block (10) has control convex blocks (12) on both sides, the control shaft rod (14) has control grooves (13) on both sides, the control convex blocks (12) are adapted to the control grooves (13), the control convex blocks (12) are connected to the control grooves (13), the lower end of the control shaft rod (14) has a supporting convex rod (15), the supporting convex rod (15) is connected to the lower connecting ear (112), the upper end of the control shaft rod (14) has a controlling circular plate (16), the controlling circular plate (16) is fitted with the upper connecting ear (111).
2. The novel forestry engineering seedling storage device according to claim 1 is characterized in that The upper connecting ear (111) has a fastening sleeve (22) on its upper part, the inner side of the fastening sleeve (22) is fitted with the position-controlling circular plate (16), the outer side of the fastening sleeve (22) is connected to the fastening buckle (23), the inner side of the fastening buckle (23) has a fastening card plate (28), the fastening sleeve (22) has card plate through holes (30) on both sides, the position-controlling circular plate (16) has a fastening card slot (29), the fastening card slot (29) and the card plate through hole (30) are adapted to the fastening card plate (28), the fastening card plate (28) passes through the card plate through hole (30), the fastening card plate (28) is connected to the fastening card slot (29), and the fastening card slot (29) has a plurality of positioning lock slots (21).
3. The novel forestry engineering seedling storage device according to claim 2 is characterized in that The fastening buckle (23) is divided into an outer fastening buckle (231) and an inner fastening buckle (232), the outer fastening buckle (231) is connected to the inner fastening buckle (232), the inner fastening buckle (232) has a fixed support plate (24) on the outside, the lower part of the fixed support plate (24) is in contact with the upper connecting ear (111), the upper part of the fixed support plate (24) is connected to the cover plate (25), the lower part of the cover plate (25) is in contact with the upper limit stopper (31), the lower part of the upper limit stopper (31) has a driving gear plate (17), the upper part of the upper limit stopper (31) has a driving shaft (26), the driving shaft (26) passes through the cover plate (25), the driving shaft (26) is connected to the rotating wheel (27), and the rotating wheel (27) is in contact with the cover plate (25).
4. The novel forestry engineering seedling storage device according to claim 3 is characterized in that The driving gear plate (17) is meshed with the driven gear plate (18), the driving gear plate (17) is connected to the driven gear plate (18), the driven gear plate (18) has a lower limit stopper (32), the lower limit stopper (32) is fitted with the inner fastening buckle (232), the lower limit stopper (32) has a limit card slot (34), the lower part of the cover plate (25) has a limit card plate (33), the limit card plate (33) is adapted to the limit card slot (34), the limit card plate (33) is connected to the limit card slot (34), the lower limit stopper (32) has a threaded support rod (19), the threaded support rod (19) is connected to the inside of the positioning lock block (20) through a thread, the outside of the positioning lock block (20) is fitted with the fastening card plate (28), the positioning lock block (20) is adapted to the positioning lock slot (21), and the positioning lock block (20) is connected to the positioning lock slot (21).
