A platform lift safety linkage

Abstract

The utility model relates to a platform lift safety linkage device, including one floor magnetic attraction door, second floor magnetic attraction door and lift, one floor magnetic attraction door installs on one floor platform, second floor magnetic attraction door installs on second floor platform, the device still includes lift door, limit switch group and control circuit, lift door installs in second floor magnetic attraction door near lift one side, limit switch group installs respectively on one floor magnetic attraction door, second floor magnetic attraction door and lift door, the proximity sensor group is installed on the lift, control circuit is electrically connected with limit switch group and proximity sensor group, when limit switch group and proximity sensor group trigger, the control circuit is conducted through, the lift rises or falls. Compared with prior art, the utility model has the advantages of high safety and reliability.

Description

Technical Field

[0001] This utility model relates to the field of safety door lock devices for lifting platforms, and in particular to a safety linkage device for a platform lifting machine. Background Technology

[0002] Platform lifts are widely used as vertical transportation equipment in industrial production, logistics and transportation, and public facilities. In existing technologies, platform lifts generally employ electromagnetic lock control systems to achieve safety interlocking. This involves signal interaction between the electromagnetic lock and the lift's operating status to ensure that the lift cannot be started when the door is not closed and that the door cannot be opened when the lift is not in position, thus preventing safety accidents caused by starting the lift with the door open or closed during operation.

[0003] The existing system is highly dependent on power supply, and the locking state of the electromagnetic locks is entirely controlled by circuitry. In the event of a power outage, abnormal voltage, or line fault, power-deprivation unlocking locks may accidentally open, allowing people to enter before the elevator reaches its designated position; or power-deprivation locking locks may fail to unlock, preventing rescue in case of entrapment. Furthermore, the high-frequency operation of electromagnetic lock mechanical components (such as the bolt and spring) over a long period can cause wear and jamming, potentially leading to false closures or delayed unlocking, directly posing operational safety risks. In particular, if the elevator platform is on the first floor and the door lock on the second floor is open, it presents a significant safety hazard.

[0004] In summary, existing safety doors and door lock control systems for platform lifts have issues with reliability and safety. Therefore, there is a need for a platform lift safety linkage device that is both highly secure and easy to control. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology, such as the simple control of the second-floor platform door lock, the susceptibility of the simple electromagnetic lock control to malfunction due to power problems, and the great safety hazards caused by accidental opening, and to provide a safety linkage device for the platform lift.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A platform lift safety linkage device includes a first-floor magnetic door, a second-floor magnetic door, and a lift. The first-floor magnetic door is installed on the first-floor platform, and the second-floor magnetic door is installed on the second-floor platform. The device also includes a lift door, a limit switch group, and a control circuit. The lift door is installed on the side of the second-floor magnetic door closest to the lift. The limit switch group is installed on the first-floor magnetic door, the second-floor magnetic door, and the lift door. A proximity sensor group is installed on the lift. The control circuit is electrically connected to the limit switch group and the proximity sensor group. When the limit switch group and the proximity sensor group are triggered, the control circuit is activated, and the lift rises or falls.

[0008] Preferably, the limit switch group includes a first limit switch, a second limit switch and a third limit switch. The first limit switch is fixed inside the door frame of the magnetic door on the first floor, the second limit switch is fixed inside the door frame of the magnetic door on the second floor, and the third limit switch is fixed inside the door frame of the lifting door.

[0009] Preferably, the proximity sensor group includes a first proximity sensor and a second proximity sensor, with the first proximity sensor installed on the first-floor platform and the second proximity sensor installed on the top of the second-floor platform.

[0010] Preferably, the bottom of the elevator is provided with a first sensing block that cooperates with the first proximity sensor, and the top of the elevator is provided with a second sensing block that cooperates with the second proximity sensor.

[0011] Preferably, the control circuit includes a main circuit and a control circuit, wherein the main circuit includes a three-phase power supply, a fuse, and the main contacts of a first relay and a second relay;

[0012] The drive motor of the elevator is electrically connected to the main contacts of the first relay and the second relay respectively, and the contacts of the first relay and the main contacts of the second relay are mutually exclusive and conduction is possible.

[0013] Preferably, the main circuit is further connected in series with a thermal relay, which is connected to the drive motor.

[0014] Preferably, the control circuit includes a descent control sub-circuit, which includes a normally open contact of a second proximity sensor, a normally closed interlock contact of a second relay, a normally open contact of a second contact switch, a normally open contact of a third contact switch, and a coil of a first relay connected in sequence. The normally open contact of the second proximity sensor and the coil of the first relay are respectively connected to the two ends of the power supply.

[0015] Preferably, the descent control sub-circuit further includes a normally open descent button and a normally closed emergency stop button. One end of the emergency stop button's contact is connected to the power supply. One end of the normally open contact of the second proximity sensor is connected to the descent button, and the other end is connected to the emergency stop button. The other end of the descent button is connected to the normally closed interlock contact of the second relay.

[0016] Preferably, the control circuit further includes an upward control sub-circuit, which includes a normally open contact of a first proximity sensor, a normally closed interlock contact of a first relay, a normally open contact of a first limit switch, and a coil of a second relay connected in sequence. The normally open contact of the first proximity sensor and the coil of the second relay are respectively connected to the two ends of the power supply.

[0017] Preferably, the rising control sub-circuit further includes a normally open rising button and a normally closed emergency stop button. One end of the emergency stop button is connected to the power supply, one end of the normally open contact of the first proximity sensor is connected to the emergency stop button, and the other end is connected to the rising button. The other end of the rising button is connected to the normally closed interlock contact of the first relay.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] (1) By using the limit switch group of both the magnetic door and the lifting door for dual verification, the reliance on the magnetic door signal detection is avoided. Existing magnetic door control may lead to misjudgments due to contact oxidation or loose wiring, especially the accidental opening of the magnetic door on the second floor, which can cause serious hazards and has low safety. In this solution, the limit switch group of the magnetic door and the lifting door, as well as the proximity sensor group on the lifting platform, work together to control the movement of the lifting platform, forming multiple verifications. Even if the magnetic door on the second-floor platform is opened, the lifting door will close, ensuring the safety of the staff on the second-floor platform.

[0020] (2) In this solution, an emergency stop button and thermal relay overload protection are set on the control circuit of the platform elevator to form a multi-level safety barrier, which can effectively reduce the risk of opening the door before the platform is in place and improve safety and reliability. Attached Figure Description

[0021] Figure 1 A schematic diagram of the linkage device provided by this utility model;

[0022] Figure 2 Electrical diagram of the control circuit of the linkage device provided by this utility model;

[0023] In the diagram: 1. Magnetic door on the first floor, 2. Magnetic door on the second floor, 3. Elevator, 4. Platform on the first floor, 5. Platform on the second floor, 6. Elevator door, 7. First limit switch, 8. Second limit switch, 9. Third limit switch, 10. First proximity sensor, 11. Second proximity sensor. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0029] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] Example 1

[0031] like Figure 1As shown, this embodiment provides a platform lift safety linkage device, including a first-floor magnetic door 1, a second-floor magnetic door 2, and a lift 3. The first-floor magnetic door 1 is installed on the first-floor platform 4, and the second-floor magnetic door 2 is installed on the second-floor platform 5. The device also includes a lift door 6, a limit switch group, and a control circuit. The lift door 6 is installed on the side of the second-floor magnetic door 2 near the lift 3. The limit switch group is installed on the first-floor magnetic door 1, the second-floor magnetic door 2, and the lift door 6 respectively. A proximity sensor group is installed on the lift 3. The control circuit is electrically connected to the limit switch group and the proximity sensor group. When the limit switch group and the proximity sensor group are triggered, the control circuit is activated, and the lift 3 rises or falls.

[0032] Working principle: When the elevator 3 is on the first floor platform 4, the contact sensor group is triggered, the first floor magnetic door 1 is closed, the limit switch group is triggered, the control circuit is turned on, and the elevator 3 rises; when the elevator 3 is on the second floor platform 5, the contact sensor group is triggered, the second floor magnetic door 2 and the elevator door 6 are closed, the limit switch group is triggered, the control circuit is turned on, and the elevator descends.

[0033] By employing dual verification via limit switch assemblies for both the magnetic door and the lifting door, reliance on magnetic door signal detection is avoided. Existing magnetic door controls may experience misjudgments due to contact oxidation or loose wiring, especially the accidental opening of magnetic door 2 on the second floor, which could cause serious harm and poses a safety risk. This solution utilizes the interconnected limit switch assemblies for both the magnetic door and the lifting door, along with the proximity sensor assembly on the lifting platform, to control the lifting platform's movement. This multi-layered verification ensures that even if the magnetic door on the second-floor platform opens, the lifting door will close, guaranteeing the safety of personnel on the second-floor platform.

[0034] In this embodiment, the limit switch group includes a first limit switch 7, a second limit switch 8, and a third limit switch 9. The first limit switch 7 is fixed inside the door frame of the magnetic door 1 on the first floor, the second limit switch 8 is fixed inside the door frame of the magnetic door 2 on the second floor, and the third limit switch 9 is fixed inside the door frame of the lifting door 6. The first limit switch 7, the second limit switch 8, and the third limit switch 9 are all model D4V-5, and their contacts face the door closing direction. They are triggered by pressure when the door is fully closed.

[0035] In this embodiment, the proximity sensor group includes a first proximity sensor 10 and a second proximity sensor 11. The first proximity sensor 10 is installed on the first-floor platform 4, and the second proximity sensor 11 is installed on the top of the second-floor platform 5.

[0036] Furthermore, the bottom of the elevator 3 is provided with a first sensing block that cooperates with the first proximity sensor 10, and the top of the elevator 3 is provided with a second sensing block that cooperates with the second proximity sensor 11.

[0037] The first proximity sensor 10 and the second proximity sensor 11 are both NBB15-30GM50-E2. The position of the elevator 3 is determined by detecting the sensing block, and then the opening and closing of the contacts in the control circuit is adjusted.

[0038] In this embodiment, as Figure 2 As shown, the control circuit includes a main circuit and a control circuit. The main circuit includes a three-phase power supply, a fuse FU, and the main contacts of the first relay KM1 and the second relay KM2. The drive motor of the elevator 4 is electrically connected to the main contacts of the first relay KM1 and the second relay KM2 respectively. The contacts of the first relay KM1 and the main contacts of the second relay KM2 are mutually exclusive and conduct.

[0039] The main circuit also includes a thermal relay FR connected in series, which is connected to the drive motor.

[0040] In this embodiment, the control circuit includes a descent control sub-circuit, which includes the normally open contact SP2 of the second proximity sensor, the normally closed interlock contact of the second relay KM2, the normally open contact SQ2 of the second contact switch, the normally open contact SQ3 of the third contact switch, and the coil of the first relay KM1, which are connected in sequence. The normally open contact of the second proximity sensor and the coil of the first relay are respectively connected to the two ends of the power supply.

[0041] Furthermore, the control circuit also includes an upward control sub-circuit, which includes the normally open contact SP1 of the first proximity sensor, the normally closed interlock contact of the first relay KM1, the normally open contact SQ1 of the first limit switch, and the coil of the second relay KM2 connected in sequence. The normally open contact of the first proximity sensor and the coil of the second relay are respectively connected to the two ends of the power supply.

[0042] The descent control sub-circuit includes a normally open descent button and a normally closed emergency stop button SB1. One end of the emergency stop button's contact is connected to the power supply. One end of the normally open contact of the second proximity sensor is connected to the descent button SB2, and the other end is connected to the emergency stop button. The other end of the descent button is connected to the normally closed interlock contact of the second relay. The ascent control sub-circuit also includes a normally open ascent button and a normally closed emergency stop button. One end of the emergency stop button is connected to the power supply. One end of the normally open contact of the first proximity sensor is connected to the emergency stop button, and the other end is connected to the ascent button SB3. The other end of the ascent button is connected to the normally closed interlock contact of the first relay. The emergency stop buttons are connected in series with the parallel ascent and descent control sub-circuits, respectively.

[0043] In this embodiment, the fuse FU is model RT28-32 and the thermal relay is model JR36-20.

[0044] Specifically, the descent process of the elevator includes:

[0045] The magnetic door on the second floor closes, triggering the second limit switch;

[0046] The lifting door closes, triggering the third limit switch;

[0047] The elevator is located on the second floor, and the second proximity sensor detects the second sensing block;

[0048] Pressing the descent button activates the descent control sub-circuit, energizes the second relay coil, closes the main contacts of the second relay, reverses the drive motor, and lowers the elevator. Simultaneously, the normally closed interlocking contacts of the second relay open to prevent the first relay from being energized.

[0049] The elevator descends to the first floor, the first proximity sensor detects the first sensing block, and the control circuit sends a signal to unlock the magnetic door on the first floor, allowing the door to open.

[0050] The lifting process of the platform lift includes:

[0051] The magnetic door on the first floor closes, triggering the first limit switch;

[0052] The elevator is located on the first floor, and the first proximity sensor detects the first sensing block;

[0053] Pressing the up button activates the up control sub-circuit, energizes the first relay coil, closes the main contacts of the first relay, drives the motor to rotate forward, and raises the elevator; at the same time, the normally closed interlocking contact of the first relay opens to prevent the second relay from being energized.

[0054] When the elevator rises to the second floor, the second proximity sensor detects the second sensing block, and the control circuit sends a signal to unlock the magnetic door and the elevator door on the second floor, allowing the door to open.

[0055] By employing dual detection of mechanical limit switches and proximity sensors, along with a multi-level interlocking control circuit, the safety hazards of existing technologies are effectively addressed, demonstrating significant practicality and promotional value.

[0056] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A platform elevator safety linkage device, comprising a first-floor magnetic door (1), a second-floor magnetic door (2), and an elevator (3), wherein the first-floor magnetic door (1) is installed on a first-floor platform (4), and the second-floor magnetic door (2) is installed on a second-floor platform (5), characterized in that, The device also includes a lifting door (6), a limit switch group and a control circuit. The lifting door (6) is installed on the side of the magnetic door (2) on the second floor near the elevator (3). The limit switch group is installed on the magnetic door (1) on the first floor, the magnetic door (2) on the second floor and the lifting door (6). The elevator (3) is equipped with a proximity sensor group. The control circuit is electrically connected to the limit switch group and the proximity sensor group. When the limit switch group and the proximity sensor group are triggered, the control circuit is turned on, and the elevator (3) rises or falls.

2. The platform elevator safety linkage device according to claim 1, characterized in that, The limit switch group includes a first limit switch (7), a second limit switch (8) and a third limit switch (9). The first limit switch (7) is fixed inside the door frame of the magnetic door (1) on the first floor, the second limit switch (8) is fixed inside the door frame of the magnetic door (2) on the second floor, and the third limit switch (9) is fixed inside the door frame of the lifting door (6).

3. The platform elevator safety linkage device according to claim 2, characterized in that, The proximity sensor group includes a first proximity sensor (10) and a second proximity sensor (11). The first proximity sensor (10) is installed on the first-floor platform (4), and the second proximity sensor (11) is installed on the top of the second-floor platform (5).

4. A platform elevator safety linkage device according to claim 3, characterized in that, The bottom of the elevator (3) is provided with a first sensing block that cooperates with the first proximity sensor (10), and the top of the elevator (3) is provided with a second sensing block that cooperates with the second proximity sensor (11).

5. A platform elevator safety linkage device according to claim 2, characterized in that, The control circuit includes a main circuit and a control circuit. The main circuit includes a three-phase power supply, a fuse, and the main contacts of a first relay and a second relay. The drive motor of the elevator (3) is electrically connected to the main contacts of the first relay and the second relay respectively, and the contacts of the first relay and the main contacts of the second relay are mutually exclusive and conduct.

6. A platform elevator safety linkage device according to claim 5, characterized in that, The main circuit is also connected in series with a thermal relay, which is connected to the drive motor.

7. A platform elevator safety linkage device according to claim 5, characterized in that, The control circuit includes a descent control sub-circuit, which includes a normally open contact of a second proximity sensor, a normally closed interlock contact of a second relay, a normally open contact of a second contact switch, a normally open contact of a third contact switch, and a coil of a first relay connected in sequence. The normally open contact of the second proximity sensor and the coil of the first relay are respectively connected to the two ends of the power supply.

8. A platform elevator safety linkage device according to claim 7, characterized in that, The descent control sub-circuit also includes a normally open descent button and a normally closed emergency stop button. One end of the emergency stop button's contact is connected to the power supply. One end of the normally open contact of the second proximity sensor is connected to the descent button, and the other end is connected to the emergency stop button. The other end of the descent button is connected to the normally closed interlock contact of the second relay.

9. A platform elevator safety linkage device according to claim 5, characterized in that, The control circuit also includes an upward control sub-circuit, which includes a normally open contact of a first proximity sensor, a normally closed interlock contact of a first relay, a normally open contact of a first limit switch, and a coil of a second relay connected in sequence. The normally open contact of the first proximity sensor and the coil of the second relay are respectively connected to the two ends of the power supply.

10. A platform elevator safety linkage device according to claim 9, characterized in that, The rising control sub-circuit also includes a normally open rising button and a normally closed emergency stop button. One end of the emergency stop button is connected to the power supply. One end of the normally open contact of the first proximity sensor is connected to the emergency stop button, and the other end is connected to the rising button. The other end of the rising button is connected to the normally closed interlock contact of the first relay.

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