Automatic resetting device for safety door on lifting platform
By adopting the rotating components and limit switch design of compression spring structure on the safety door of the lifting platform, the automatic reset of the safety door is achieved, solving the equipment failure problem caused by manual door closing, and improving the reliability and operating efficiency of the equipment.
Patent Information
- Application Number
- CN202422238238.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-12
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-09-12
AI Technical Summary
The existing lifting platform safety door needs to be closed manually, which has a short service life and poor synchronization, which affects the crane operation efficiency.
The rotating component designed with a compression spring structure realizes automatic reset of the safety door, uses the compression force of the spring to push the door leaf to automatically close, and detects the position of the door through the limit switch to ensure automatic reset of the safety door.
The rapid and automatic door closing of safety doors is realized, which improves the reliability and stability of the equipment, avoids equipment failures caused by failure to close the doors in time, and improves the operating efficiency of the crane.
Smart Images
Figure CN223213783U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an automatic resetting device for a safety door on a lifting platform, belonging to the technical field of safety protection of lifting platforms. Background Art
[0002] The railings, platforms, and ladders installed on port cranes and industrial lifting platforms serve as crucial safety features for operators, installers, and maintenance personnel. They not only ensure the safety of operators and prevent them from falling, but also serve to separate operating and non-operating areas, guiding personnel to navigate the area and avoiding collisions. Their installation must meet the needs of inspection, maintenance, and upkeep, while also meeting the operational and safety requirements of operators. Ladder walkways and platforms typically access and service areas such as the crane's cab, electrical room, machine room, elevator bay, cab cleaning platform, and girders. Safety gates equipped with locks and limit switches are installed at the ends of access passages accessible to operators and staff, at the cab door, and at the platform access points. When the gates are open, power to the crane is cut off, and if power is already on, the entire crane is deactivated. This design ensures that any attempt to enter a dangerous area during crane operation is promptly prevented, thereby ensuring the safety of personnel.
[0003] Conventional safety doors require the operator to close them manually. Operators often leave without closing the door in time and leave the crane, causing the entire machine to lose power. To restore power, the operator must climb through the platform passage to the open safety door and close it in place. This problem leads to frequent failures, greatly affecting the operating efficiency of the crane.
[0004] The automatic reset of existing door leaves often adopts a coil spring structure, but the coil spring has a short service life due to frequent use and needs to be replaced frequently. In addition, the reset synchronization of the coil spring is poor, and the door is not opened and closed smoothly. Summary of the Invention
[0005] The technical problem to be solved by the utility model is to provide an automatic reset device for a safety door on a lifting platform. The automatic reset device for the safety door on the lifting platform adopts a compression spring structure, which can realize rapid door closing, adapt to complex working conditions on site, and meet reliability and stability.
[0006] In order to solve the above problems, the specific technical solutions of the present invention are as follows: an automatic reset device for a safety door on a lifting platform, comprising a door frame and a door leaf, and several groups of rotating components are respectively provided in the height direction of the door frame and the door leaf, each rotating component comprising a pair of sleeves, a pair of springs and a screw, each sleeve is coaxially gap-connected with the middle part of the screw, the relative contact surfaces of the two sleeves are respectively inclined surfaces at an angle of 45°, the outer ends of the two sleeves are provided with ears, and are respectively connected to the corresponding door frame or door leaf; springs are respectively provided on the upper surface of the upper sleeve and the lower surface of the lower sleeve, and the other end of the spring is supported on the end face of the nut connected to the screw.
[0007] A limit mounting plate is provided on the door frame away from the rotating assembly, a limit switch is provided on the limit mounting plate, and a contact piece is provided at a corresponding position of the door leaf.
[0008] When the door leaf is closed, the distance between the contact and the limit switch is L=4~8mm.
[0009] A rubber block fixing plate is provided on the door frame away from the rotating assembly, a rubber pad is connected to the rubber block fixing plate, and a limiting plate is provided at a corresponding position of the door leaf.
[0010] The top of the door leaf is movably connected to a wrench at a position away from the rotating assembly, and a lock plate with a slot is provided at a corresponding position of the door frame, and the wrench is plugged into the slot of the lock plate.
[0011] The door frame and the door leaf are respectively formed by welding seamless steel pipes.
[0012] The automatic reset device for the safety door on the lifting platform of the present application designs the hinge point of the safety door rotation into a spring hinge type, and the hinge sleeve is designed to be docked at a 45-degree angle. When the operator opens the door and leaves, the safety door is automatically closed under the action of the spring pressure on the hinge, and the pressure is converted into rotational force. After the safety door is closed, the contact is the induction switch action, and the whole machine is in a power-on state, avoiding malfunctions caused by failure to close the door in time after the person leaves. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a three-dimensional diagram of the automatic reset device for the safety door on the lifting platform.
[0014] Figure 2 This is the main view of the automatic reset device for the safety door on the lifting platform.
[0015] Figure 3 This is a side view of the automatic reset device for the safety door on the lifting platform.
[0016] Figure 4 for Figure 1 AA cross-sectional view.
[0017] Figure 5 for Figure 1 BB cross-sectional view.
[0018] Figure 6 This is the main view of the rotating component.
[0019] Figure 7 for Figure 6 CC cross-sectional view. DETAILED DESCRIPTION
[0020] like Figures 1 to 3 As shown, an automatic reset device for a safety door on a lifting platform includes a door frame 1 and a door leaf 2. The door frame 1 and the door leaf 2 are welded with seamless steel pipes to improve the overall strength. Several sets of rotating components are respectively provided in the height direction of the door frame 1 and the door leaf 2. Figure 6 and Figure 7 As shown, each rotating assembly includes a pair of sleeves 3, a pair of springs 4 and a screw 5. Each sleeve 3 is coaxially gap-connected to the middle of the screw 5. The relative contact surfaces of the two sleeves 3 are inclined surfaces at an angle of 45°. The outer ends of the two sleeves 3 are provided with ears, and are respectively connected to the corresponding door frame 1 or door leaf 2; springs 4 are respectively provided on the upper surface of the upper sleeve 3 and the lower surface of the lower sleeve 3, and the other end of the spring 4 is supported on the end face of the nut connected to the screw 5.
[0021] like Figure 5 As shown, a limit mounting plate 6 is installed on the door frame 1, away from the rotating assembly. A limit switch 7 is installed on this plate, and a contact 8 is installed at the corresponding position on the door leaf 2. When the door leaf 2 is closed, the distance L between the contact 8 and the limit switch 7 is 4 to 8 mm. When the limit switch 7 detects a position signal, the host computer is powered.
[0022] like Figure 4 As shown, a rubber block fixing plate 9 is provided on the door frame 1 away from the rotating component, and a rubber pad 10 is connected to the rubber block fixing plate 9. A limiting plate 11 is provided at the corresponding position of the door leaf 2. The rubber pad 10 plays a shock-absorbing role to prevent the door leaf 2 from colliding hard with the door frame 1, and at the same time plays a limiting function for the one-way opening of the door leaf 2 relative to the door frame 1.
[0023] The top of the door leaf 2 is movably connected to a wrench 12, away from the rotating assembly. A lock plate 13 with a slot is provided at a corresponding position of the door frame 1. The wrench 12 is plugged into the slot of the lock plate 13. When the lifting platform is in working state, the wrench 12 and the lock plate 13 are always plugged into position.
[0024] When people pass through the safety door and the safety door rotates to open, the upper and lower sleeves 3 of the screw 5 rotate and separate as the door leaf 2 opens, the two inclined surfaces are misaligned, and the upper and lower springs 4 are compressed, generating axial pressure. When the door is opened to 90°, the axial pressure generated by the compression of the spring acts on the inclined contact surfaces of the upper and lower sleeves. The axial pressure acting on the inclined surfaces will generate a lateral horizontal force. The greater the pressure, the greater the horizontal force. The lateral horizontal force acts on the hinge. After the person opens the door, the lateral horizontal force pushes the door leaf 2 to rotate, thereby achieving the purpose of automatic closing.
Claims
1. An automatic reset device for a safety door on a lifting platform, characterized by: The invention comprises a door frame (1) and a door leaf (2), wherein a plurality of rotating components are respectively provided in the height direction of the door frame (1) and the door leaf (2), each rotating component comprises a pair of shaft sleeves (3), a pair of springs (4) and a screw rod (5), each shaft sleeve (3) is coaxially gap-connected with the middle part of the screw rod (5), and the relative contact surfaces of the two shaft sleeves (3) are inclined surfaces at an angle of 45 degrees, and the outer ends of the two shaft sleeves (3) are provided with lugs and are respectively connected to the corresponding door frame (1) or door leaf (2); the upper surface of the upper shaft sleeve (3) and the lower surface of the lower shaft sleeve (3) are respectively provided with springs (4), and the other end of the spring (4) is supported on the end face of a nut connected to the screw rod (5).
2. The automatic reset device for the safety door on the lifting platform according to claim 1 is characterized in that: A limit mounting plate (6) is provided on the door frame (1) away from the rotating assembly, a limit switch (7) is provided on the limit mounting plate (6), and a contact member (8) is provided at a corresponding position of the door leaf (2).
3. The automatic reset device for the safety door on the lifting platform according to claim 2 is characterized in that: When the door leaf (2) is closed, the distance between the contact member (8) and the limit switch (7) is L = 4 to 8 mm.
4. The automatic reset device for the safety door on the lifting platform according to claim 1 is characterized in that: A rubber block fixing plate (9) is provided on the door frame (1) away from the rotating assembly, a rubber pad (10) is connected to the rubber block fixing plate (9), and a limiting plate (11) is provided at a corresponding position of the door leaf (2).
5. The automatic reset device for the safety door on the lifting platform according to claim 1 is characterized in that: A wrench (12) is movably connected to the top of the door leaf (2) and at a position away from the rotating assembly. A lock plate (13) with a slot is provided at a corresponding position of the door frame (1). The wrench (12) is plugged into the slot of the lock plate (13).
6. The automatic reset device for the safety door on a lifting platform according to any one of claims 1 to 4, characterized in that: The door frame (1) and the door leaf (2) are respectively formed by welding seamless steel pipes.