Locking device for protective door of lifting platform

Abstract

The utility model provides a locking device for a lifting platform protective door, belongs to the technical field of protective door locking, and effectively solves the problem that a protective door of an existing fodder conveying lifting platform is inconvenient to lock. According to the technical scheme, clamping plates are symmetrically arranged on the left side and the right side of the side, facing the opening of the lifting well, of the protective door, a first poke rod and a second poke rod are arranged on the upper side and the lower side of each clamping plate correspondingly, and mounting grooves are symmetrically formed in the two sides of each layer of the lifting well and connected with limiting plates matched with the clamping plates; the upper driving wheel and the lower driving wheel are matched with the first poke rod and the second poke rod respectively. The locking device for the lifting platform protective door has the advantages of being convenient to use and capable of automatically limiting the safety protective door.

Description

Technical Field

[0001] The utility model relates to the technical field of protective door locking, in particular to a locking device for a protective door of a lifting platform. Background Art

[0002] In the large-scale breeding process of livestock and poultry, feed silos are indispensable supporting facilities. Generally, a feeding platform will be built at the feeding port on the top of the feed silo. The bagged feed will be transported from the first layer to the secondary feeding platform through the lifting platform, and then put into the feeding silo from the feeding port. In order to ensure the safety of personnel when transporting feed and operators, a protective door will be set on the outside of the lifting platform. The protective door is usually composed of a welded structure of a steel structure frame and a steel wire mesh. The top of the protective door is connected to a winch by a traction rope to control its lifting for easy use. When personnel are loading and unloading feed, the protective door is opened, which poses a safety hazard: when the steel structure connected to the traction rope at the top breaks, the safety door falls and causes a safety accident. At present, a fixing ring is welded on the safety door, and a cylinder is installed in the lifting shaft. After the protective door is pulled up, the telescopic end of the cylinder is inserted into the inner side of the fixing ring to limit the safety door from falling. However, in actual use, the operator needs to frequently operate the extension and contraction of the cylinder, and it must be aligned with the fixing ring, which causes inconvenience in operation.

[0003] Therefore how to solve the above-mentioned technical problems just becomes the problem that the utility model faces. Utility Model Content

[0004] In order to solve the deficiencies of the prior art, the utility model provides a locking device for a lifting platform protective door which is easy to use and can automatically limit the safety protective door.

[0005] The technical solution adopted by the utility model to solve its technical problems is: the utility model provides a locking device for the protective door of a lifting platform, including a clamping plate symmetrically arranged on the left and right sides of the protective door facing the opening of the lifting shaft, and a first toggle rod and a second toggle rod are respectively arranged on the upper and lower sides of the clamping plate, and installation grooves are symmetrically opened on both sides of the lifting shaft on each floor, and the installation grooves are connected with a limit plate matched with the clamping plate, and an upper driving wheel and a lower driving wheel respectively matched with the first toggle rod and the second toggle rod.

[0006] A threaded barrel is connected to the upper side of the installation groove and is horizontally rotatable toward the inner side of the lifting shaft. A screw is threadedly connected to the inner side of the threaded barrel. The telescopic end of the screw is rotatably connected to the limit plate. A baffle is provided below the limit plate and is horizontally fixedly connected to the telescopic end of the screw.

[0007] A limiting strip extending to the bottom of the limiting plate is fixedly connected to the lower front side of the screw telescopic part, and the limiting strip is slidably matched with a limiting groove arranged on the inner side of the lifting shaft.

[0008] An upper rotating rod is connected in a damping rotation in the mounting groove above the threaded cylinder, the inner end of the upper rotating rod extends to the inner side of the lifting shaft, the inner end of the upper rotating rod is coaxially sleeved with the upper driving wheel, and the outer wall of the upper driving wheel is fixedly connected with three upper protrusions equidistantly along the circumferential direction;

[0009] A lower rotating rod is connected to the lower side of the mounting groove for damping rotation, the inner end of the lower rotating rod extends to the inner side of the lifting shaft, the inner end of the lower rotating rod is coaxially sleeved with the lower driving wheel, and the outer wall of the lower driving wheel is fixedly connected with three lower protrusions equidistantly along the circumferential direction.

[0010] The threaded barrel is located at the inner side of the installation groove and is coaxially sleeved with the first transmission plate and the second transmission plate, the upper rotating rod is located at the inner side of the installation groove and is coaxially sleeved with the third transmission plate, the lower rotating rod is located at the inner side of the installation groove and is coaxially sleeved with the fourth transmission plate, a first transmission belt is sleeved between the first transmission plate and the third transmission plate, and a second transmission belt is sleeved between the second transmission plate and the fourth transmission plate.

[0011] A lifting ring is provided on the top of the protective door, and the lifting ring is fixedly connected to the bottom end of the traction rope, and the top end of the traction rope is connected to the winch arranged on the top of the lifting shaft.

[0012] When the utility model is actually used: the lifting platform is on the first floor, and the protective door is on the outside of the lifting platform as the initial state, the protective door starts to lift, and the lower protrusion is located at the second wave rod and contacts. When the card plate contacts the limit plate, the limit plate will automatically flip upwards. After the card plate is out of contact with the limit plate, the protective door stops rising, and the limit plate returns to a horizontal state. Under the action of the baffle, the limit plate will not flip downwards, which ensures that when the protective door falls, the limit plate blocks the card plate to prevent the protective door from falling. The operator can place the bagged feed on the lifting platform. After the transportation is completed, the operator goes up to the lifting platform together, and the protective door continues to lift upwards first. The first toggle rod pushes the upper protrusion upwards to push it close to the inside of the installation groove. At the same time, the upper protrusion The rotation of the block drives the threaded barrel to rotate, and the threaded barrel drives the screw to retract, and the limit plate retracts and leaves the position that blocks the card plate from falling, and at the same time drives the lower protrusion to rotate to the outside of the installation slot, and the protective door begins to fall. When it falls to the bottom, the second wave bar pushes the lower protrusion downward, and the lower protrusion rotates into the installation slot, and simultaneously drives the limit plate to extend, and the upper protrusion rotates to the outside of the installation slot. At this time, the upgrading platform is lifted toward the secondary unloading platform by the push of the hydraulic cylinder, and the protective door moves upward synchronously under the traction of the traction rope. During the upward process, the first wave bar pushes the upper protrusion again, and the limit plate is retracted, which will not prevent the protective door from descending again and reaching the second-floor unloading platform. The protective door is lifted to unload, and the same components set on the second and first floors play the same locking role.

[0013] The beneficial effects of the utility model are as follows: no additional power unit is required, the locking and contact locking of the protective door can be switched during the lifting and lowering process of the protective door itself, the operation is convenient, and the utility model is economical and durable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the front view of the utility model;

[0015] Figure 2 This is a schematic diagram of the three-dimensional structure of the utility model lifting platform located on the first floor with the protective door not opened;

[0016] Figure 3 for Figure 2 A magnified schematic diagram of area A;

[0017] Figure 4 for Figure 2 A magnified schematic diagram of area B;

[0018] Figure 5 This is a schematic diagram of the three-dimensional structure of the utility model lifting platform located on the first floor with the protective door open;

[0019] Figure 6 for Figure 5 The D area is enlarged;

[0020] Wherein, the accompanying drawings are marked as follows:

[0021] 1. Protective door; 2. Card plate; 3. First toggle rod; 4. Second toggle rod; 5. Mounting groove; 6. Limit plate; 7. Upper drive wheel; 8. Lower drive wheel; 9. Threaded barrel; 10. Screw; 11. Baffle; 12. Limit strip; 13. Limit groove; 14. Upper rotating rod; 15. Upper protrusion; 16. Lower rotating rod; 17. First transmission disc; 18. Second transmission disc; 19. Third transmission disc; 20. Fourth transmission disc; 21. First transmission belt; 22. Second transmission belt; 25; Winch; 26. Lifting shaft; 27. Lower protrusion; 28. Lifting cylinder; 29. ​​Lifting platform. DETAILED DESCRIPTION

[0022] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0023] See also Figures 1 to 6As shown, the utility model is a locking device for the protective door of a lifting platform, comprising a card plate 2 symmetrically arranged on the left and right sides of the protective door 1 facing the opening of the lifting shaft 26, and the card plate 2 is respectively provided with a first toggle rod 3 and a second toggle rod 4 on the upper and lower sides, and a mounting groove 5 is symmetrically opened on both sides of each floor of the lifting shaft 26, and the mounting 5 is connected with a limit plate matched with the card plate 2, and an upper driving wheel 7 and a lower driving wheel 8 respectively matched with the first toggle rod 3 and the second toggle rod 4. A lifting ring is arranged on the top of the protective door 1, and the lifting ring is fixedly connected to the bottom end of the traction rope, and the top end of the traction rope is connected to the winch 25 arranged on the top of the lifting shaft 26.

[0024] A threaded tube 9 is connected horizontally and rotatably above the mounting groove 5 and toward the inner side of the lifting shaft 26. A screw rod 10 is threadedly connected inside the threaded tube 9. The telescopic end of the screw rod 10 is rotatably connected to a limiting plate 6. A baffle plate 11 is provided below the limiting plate 6 and is horizontally and fixedly connected to the telescopic end of the screw rod 10. A limiting strip 12 extending to the bottom of the limiting plate 6 is fixedly connected to the front lower side of the telescopic part of the screw 10. The limiting strip 12 slides in cooperation with a limiting groove 13 provided inside the lifting shaft 26. An upper rotating rod 14 is connected to the mounting groove 5 above the threaded tube 9 for damping rotation. The inner end of the upper rotating rod 14 extends to the inner side of the lifting shaft 26. The inner end of the upper rotating rod 14 is coaxially sleeved with the upper driving wheel 7. The outer wall of the upper driving wheel 7 is fixedly connected with three upper protrusions 15 at equal intervals along the circumferential direction. A lower rotating rod 16 is connected to the lower side of the mounting groove 5 for damping rotation. The inner end of the lower rotating rod 16 extends to the inner side of the lifting shaft 26. The inner end of the lower rotating rod 16 is coaxially sleeved with the lower driving wheel 8. The outer wall of the lower driving wheel 8 is fixedly connected with three lower protrusions 27 at equal intervals along the circumferential direction. The threaded barrel 9 is located at the inner part of the mounting groove 5 and is coaxially sleeved with the first transmission plate 17 and the second transmission plate 18, the upper rotating rod 14 is located at the inner part of the mounting groove 5 and is coaxially sleeved with the third transmission plate 19, the lower rotating rod 16 is located at the inner part of the mounting groove 5 and is coaxially sleeved with the fourth transmission plate 20, a first transmission belt 21 is sleeved between the first transmission plate 17 and the third transmission plate 19, and a second transmission belt 22 is sleeved between the second transmission plate 18 and the fourth transmission plate 20.

[0025] In actual use: the lifting platform 29 is located on the first floor, and the protective door 1 is located outside the lifting platform 29 as the initial state. The protective door 1 starts to rise, and the lower protrusion 27 is located at the second wave rod 4 and contacts. When the card plate 2 contacts the limit plate 6, the limit plate 6 will automatically flip upwards. After the card plate 2 is out of contact with the limit plate 6, the protective door 1 stops rising, and the limit plate 2 returns to a horizontal state. Under the action of the baffle 11, the limit plate 2 will not flip downwards. This ensures that when the protective door 1 falls, the limit plate 2 blocks the card plate 2 and prevents the protective door from falling. The operator can place the bagged feed on the lifting platform 29. After the transportation is completed, the operator goes up to the lifting platform 29 together. The protective door 1 continues to lift upwards first, and the first toggle rod 3 pushes the upper protrusion 15 upwards to push it close to the inner side of the installation groove 5. At the same time, the upper protrusion 15 The rotation drives the threaded barrel 9 to rotate, and the threaded barrel 9 drives the screw rod 10 to retract, and the limit plate 6 retracts and leaves the position that blocks the card plate 2 from falling, and at the same time drives the lower protrusion 27 to rotate to the outside of the installation groove 5, and the protective door 1 starts to fall. When it falls to the bottom, the second wave rod 4 pushes the lower protrusion 27 downward, and the lower protrusion 27 rotates into the installation groove 5, and synchronously drives the limit plate 6 to extend, and the upper protrusion 15 rotates to the outside of the installation groove 5. At this time, the upgrading platform 29 is lifted toward the secondary unloading platform under the push of the hydraulic cylinder 28, and the protective door 1 moves upward synchronously under the traction of the traction rope. During the upward process, the first wave rod 3 pushes the upper protrusion 15 again, and the limit plate 6 is recovered, which will not prevent the protective door 1 from descending again and reaching the second-layer unloading platform. The protective door 1 is lifted to unload, and the same components arranged on the second and first floors play the same locking role.

[0026] 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, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A locking device for a lifting platform protective door, characterized in that: The invention comprises a card plate (2) symmetrically arranged on the left and right sides of the opening of the protective door (1) facing the elevator shaft (26), the card plate (2) is respectively provided with a first toggle rod (3) and a second toggle rod (4) on the upper and lower sides, and a mounting groove (5) is symmetrically opened on both sides of the elevator shaft (26) on each floor, the mounting groove (5) is connected with a limit plate (6) matched with the card plate (2), and an upper driving wheel (7) and a lower driving wheel (8) respectively matched with the first toggle rod (3) and the second toggle rod (4).

2. The locking device for the protective door of a lifting platform according to claim 1, characterized in that: A threaded barrel (9) is connected horizontally and rotatably above the mounting groove (5) and toward the inside of the lifting shaft (26); a screw rod (10) is threadedly connected inside the threaded barrel (9); the telescopic end of the screw rod (10) is rotatably connected to the limit plate (6); a baffle plate (11) is provided below the limit plate (6) and is horizontally and fixedly connected to the telescopic end of the screw rod (10); A limiting strip (12) extending to the bottom of the limiting plate (6) is fixedly connected to the lower front side of the telescopic portion of the screw rod (10), and the limiting strip (12) is slidably matched with a limiting groove (13) provided on the inner side of the lifting shaft (26).

3. The locking device for the protective door of a lifting platform according to claim 2, characterized in that: An upper rotating rod (14) is connected to the mounting groove (5) above the threaded barrel (9) in a damping rotation manner, the inner end of the upper rotating rod (14) extends to the inner side of the lifting shaft (26), the inner end of the upper rotating rod (14) is coaxially sleeved with the upper driving wheel (7), and the outer wall of the upper driving wheel (7) is fixedly connected with three upper protrusions (15) equidistantly along the circumferential direction; A lower rotating rod (16) is connected to the lower side of the mounting groove (5) in a damping rotation manner. The inner end of the lower rotating rod (16) extends to the inner side of the lifting shaft (26). The inner end of the lower rotating rod (16) is coaxially sleeved with the lower driving wheel (8). The outer wall of the lower driving wheel (8) is fixedly connected with three lower protrusions (27) at equal intervals in the circumferential direction.

4. The locking device for the protective door of a lifting platform according to claim 3, characterized in that: The threaded barrel (9) is coaxially sleeved with a first transmission disc (17) and a second transmission disc (18) on the inner side of the installation groove (5); the upper rotating rod (14) is coaxially sleeved with a third transmission disc (19) on the inner side of the installation groove (5); the lower rotating rod (16) is coaxially sleeved with a fourth transmission disc (20) on the inner side of the installation groove (5); a first transmission belt (21) is sleeved between the first transmission disc (17) and the third transmission disc (19); and a second transmission belt (22) is sleeved between the second transmission disc (18) and the fourth transmission disc (20).

5. The locking device for the protective door of a lifting platform according to claim 1, characterized in that: A lifting ring is provided at the top of the protective door (1), the lifting ring is fixedly connected to the bottom end of the traction rope, and the top end of the traction rope is connected to a winch (25) provided at the top of the lifting shaft (26).

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