Car overhead beam integrated weighing device for an elevator

Abstract

The utility model discloses a car upper beam integrated type weighing device for elevator belongs to elevator weighing technical field, including upper beam, the symmetrical installation of one side of upper beam has the support, the safety tongs pull mechanism of being able to lock the elevator car and prevent its falling is assembled on the support, the overloading switch support of being able to let elevator immediately power off not close the door in the instant of overload is also assembled on the upper beam, the both sides of upper beam are provided with the guide roller respectively, the weighing sampling point is changed from "wire rope tension" to "upper beam - stand elastic compression", and the car is in the same loading path in top layer, bottom layer, middle layer, and the elastic deformation amount is linearly related with load, and the full stroke error of actual measurement is less than or equal to 2%, and compared with traditional rope head weighing, it reduces an order of magnitude, realizes whole process low error overload detection.

Description

Technical Field

[0001] This utility model relates to the field of elevator weighing technology, and in particular to an integrated weighing device for the upper beam of an elevator car. Background Technology

[0002] Elevator car weighing commonly employs a bottom-mounted arrangement: pressure sensors, rubber load-sensing pads, or strain gauges are installed between the bottom beams or brackets and the car walls, and the load is calculated by detecting the elastic deformation of the bottom of the car. This method requires a large sensor installation space, typically requiring a pit depth of ≥500mm, and also necessitates reserving space for wiring and maintenance at the bottom of the car. However, the application of the above method in villa elevators is limited by the pit depth. The weighing at the bottom of the car occupies the height of the pit, making it impossible to install the system in villa shafts where the pit cannot be dug. At the same time, the weighing at the top (slack wire rope) and bottom (slack counterweight side) has an error of >20%, which cannot achieve low-error overload detection throughout the entire process. Utility Model Content

[0003] The purpose of this utility model is to solve the problem that existing rope-head weighing systems produce large errors when the elevator is at the top and bottom floors, making it impossible to effectively measure the load of the elevator car. Therefore, this utility model proposes an integrated weighing device for the upper beam of the elevator car.

[0004] To achieve the above objectives, the present invention employs the following technology: an integrated weighing device for an elevator car upper beam, comprising an upper beam, with supports symmetrically installed on one side of the upper beam, and a safety clamp lifting mechanism capable of locking the elevator car to prevent it from falling on the supports, and an overload switch bracket capable of immediately cutting off power and not closing the door when the elevator is overloaded on the upper beam, and guide rollers are respectively provided on both sides of the upper beam.

[0005] As a further description of the above technical solution: the safety clamp lifting mechanism includes a camshaft rotatably mounted between two supports, and a square interface at one end of the camshaft is connected to the U-shaped fork of the speed limiter wire rope.

[0006] As a further description of the above technical solution: the other end of the camshaft extends to the outside of the support, and an eccentric pin is provided at this end of the camshaft. The upper end of the lifting rod is rotatably mounted on the eccentric pin through a bearing.

[0007] As a further description of the above technical solution: the lower end of the lifting rod is provided with an external thread and engages with the central copper nut of the safety clamp wedge block, and the length of the external thread is greater than 15mm.

[0008] As a further description of the above technical solution: the long arm end of the overload switch bracket is provided with an elongated hole for fixing the micro switch, and the short arm end is rigidly connected to the web of the upper beam by bolts.

[0009] As a further description of the above technical solution: the guide rollers are rotatably connected between the web plates on both sides of the upper beam via an eccentric shaft, and the overload switch bracket is located between the two guide rollers.

[0010] As a further description of the above technical solution: an elastic damping pad is provided between the upper beam and the column. The elastic damping pad is cylindrical and made of polyurethane material.

[0011] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: By integrating the weighing device, safety clamp lifting mechanism, and guide rollers into the upper beam, a compact "one beam, three uses" structure is formed. This significantly reduces the space required above the elevator car, lowering the pit depth requirement for villa elevators to 200mm and the top-floor clearance requirement to 80mm. This effectively solves the problem of existing villas being unable to install traditional elevators due to structural limitations. By installing elastic damping pads between the upper beam and the columns, the minute deformations caused by the car load are precisely transmitted to the overload switch bracket, and then detected by a microswitch. This design achieves high-precision load monitoring, ensuring that the elevator can withstand overload moments. The system quickly cuts off power and prevents the doors from closing, keeping the weighing error within a very small range and effectively ensuring the safety of the elevator. Meanwhile, the safety clamp lifting mechanism and the overload switch bracket share the same positioning hole on the upper beam web, ensuring high precision in their relative positions and improving the stability and reliability of the elevator operation. The weighing sampling point has been changed from "wire rope tension" to "elastic compression of the upper beam and column." The car is on the same loading path at the top, bottom, and middle levels, with the elastic deformation linearly related to the load. The measured full-stroke error is ≤2%, a reduction of one order of magnitude compared to traditional rope-end weighing, achieving low-error overload detection throughout the entire process. Attached Figure Description

[0012] Figure 1 An overall schematic diagram according to an embodiment of the present utility model is shown; Figure 2 The present invention provides an embodiment of the present invention. Figure 1 Another perspective view; Figure 3 The present invention provides an embodiment of the present invention. Figure 1 Side view; Figure 4 The present invention provides an embodiment of the present invention. Figure 1 Top view.

[0013] Legend: 10. Upper beam; 11. Support; 12. Safety gear lifting mechanism; 121. Camshaft; 122. Speed ​​limiter wire rope; 123. Lifting rod; 13. Overload switch bracket; 14. Guide roller. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0015] Reference Figure 1 - Figure 4 This embodiment provides an integrated weighing device for an elevator car upper beam, comprising an upper beam 10, which is an integral H-beam with a web thickness ≥8mm and a deflection ≤0.3mm at 110% load to ensure the trigger point does not drift. A support 11 is symmetrically installed on one side of the upper beam 10, and a safety clamp lifting mechanism 12 is installed on the support 11 to lock the elevator car and prevent it from falling. An overload switch bracket 13 is also installed on the upper beam 10 to immediately cut off the power and prevent the door from closing when the elevator is overloaded. Guide rollers 14 are respectively provided on both sides of the upper beam 10. By integrating the three functions of "weighing, anti-fall, and guidance" into a single upper beam 10, a "one beam, three uses" integrated solution is formed, solving the problem that the shallow pit of a villa elevator cannot accommodate a car bottom weighing device. At the same time, the height dimension after integration is ≤120mm, which meets the mandatory clause of villa elevators with a pit ≤200mm.

[0016] Reference Figure 2 - Figure 4 Specifically, to prevent the elevator car from overspeeding downwards or the rope from breaking, a safety clamp lifting mechanism 12 is installed. The safety clamp lifting mechanism 12 includes a camshaft 121 rotatably mounted between two supports 11. This installation method ensures that the camshaft 121 can rotate smoothly under the support of the supports 11. The supports 11 provide a stable support foundation for the camshaft 121, while allowing the camshaft 121 to rotate smoothly when subjected to external forces. The square interface at one end of the camshaft 121 is connected to the U-shaped fork of the speed governor wire rope 122. The square interface and the U-shaped fork of the speed governor wire rope 122 are tightly and firmly matched, which can quickly transmit the rotational motion to the camshaft 121 when the speed governor detects an abnormality. This connection method has high torque transmission efficiency and can ensure that in an emergency, the camshaft 121 can respond in time and start rotating, thereby initiating the working process of the safety clamp lifting mechanism 12.

[0017] In more detail, the other end of the camshaft 121 extends to the outside of the support 11. An eccentric pin is provided at this end of the camshaft 121. The upper end of the lifting rod 123 is rotatably mounted on the eccentric pin through a bearing. When the camshaft 121 rotates, the eccentric pin will drive the upper end of the lifting rod 123 to perform a circular motion. However, due to the presence of the bearing, the upper end of the lifting rod 123 can convert this circular motion into a vertical linear motion. This motion conversion mechanism is the key link for the safety clamp lifting mechanism 12 to realize its function. It enables the lifting rod 123 to move up and down precisely under the rotational drive of the camshaft 121.

[0018] In more detail, the lower end of the lifting rod 123 is provided with an external thread that engages with the central copper nut of the safety clamp wedge. The length of the external thread is greater than 15mm. This design not only provides sufficient connection strength, but also allows for fine adjustments to the position of the lifting rod 123 during installation and commissioning to ensure that the safety clamp wedge can clamp the guide rail in the correct position. When the upper end of the lifting rod 123 moves upward under the drive of the eccentric pin, the lifting rod 123 will transmit the vertical pulling force to the safety clamp wedge block through the engagement of the external thread at its lower end with the copper nut. After being pulled, the safety clamp wedge block will move upward along the predetermined track and finally clamp onto the elevator guide rail, thereby realizing the function of locking the elevator car, preventing the car from falling due to loss of control, and ensuring the safety of passengers and equipment.

[0019] Reference Figure 2 Specifically, in order to enable real-time monitoring and automatic control of elevator car overload, an elongated hole is provided at the long arm end of the overload switch bracket 13 for fixing a micro switch. The length direction of the elongated hole is consistent with the length direction of the upper beam 10, allowing the micro switch to be moved and adjusted within a certain range along the length direction of the elongated hole during installation. In this way, the initial gap between the micro switch and the impact plate can be accurately set, thereby ensuring the accuracy of overload detection. The short arm end is rigidly connected to the web of the upper beam 10 by bolts. This connection method ensures the stability and reliability of the overload switch bracket 13 during elevator operation, preventing the bracket from loosening due to vibration or other external forces, which would affect the normal operation of the micro switch. At the same time, the rigid connection can also effectively transmit the force generated during overload to the upper beam 10, ensuring the strength and stability of the entire structure.

[0020] In more detail, the guide roller 14 is rotatably connected between the two web plates of the upper beam 10 via an eccentric shaft. The guide roller 14 faces the working surface of the guide rail. When the car is running, the guide roller 14 rolls along the guide rail, thereby limiting the horizontal displacement of the car and preventing swaying, shaking or twisting. At the same time, the design of the eccentric shaft allows the side clearance between the guide roller 14 and the guide rail to be adjusted. When it is necessary to adjust the side clearance, simply rotate the eccentric shaft to change the distance between the guide roller 14 and the guide rail, ensuring that the guide roller 14 and the guide rail maintain appropriate contact pressure and running clearance. The overload switch bracket 13 is located between the two guide rollers 14.

[0021] In more detail, an elastic damping pad is installed between the upper beam 10 and the column, which plays a role in buffering and shock absorption. The elastic damping pad is cylindrical and made of polyurethane material. Polyurethane material has high strength and wear resistance, and can maintain a stable shock absorption effect during long-term use. When the load inside the elevator car increases, the weight of the car is transferred to the upper beam 10 through the column, and the upper beam 10 will undergo slight downward deformation. The downward deformation of the upper beam 10 is transmitted to the overload switch bracket 13. Because the short arm end of the overload switch bracket 13 is connected to the upper beam... The web of the upper beam 10 is rigidly connected, and the micro switch at the long arm end will be displaced accordingly. When the load exceeds the set overload value, the sinking of the upper beam 10 reaches a certain level, causing the contacts of the micro switch to switch, thereby outputting an overload signal. The overload signal output by the micro switch is transmitted to the elevator control system. After receiving the signal, the control system will immediately take measures, such as cutting off the elevator's running circuit to stop the elevator from running, and issuing an overload alarm to remind passengers to reduce the load until the load drops to a safe range, at which point the elevator can resume normal operation.

[0022] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An integrated weighing device for the car upper beam of an elevator, characterized in that, The upper beam (10) is symmetrically equipped with a support (11) on one side. The support (11) is equipped with a safety clamp lifting mechanism (12) that can lock the elevator car to prevent it from falling. The upper beam (10) is also equipped with an overload switch bracket (13) that can immediately cut off the power and not close the door when the elevator is overloaded. Guide rollers (14) are respectively provided on both sides of the upper beam (10).

2. The integrated weighing device for the car upper beam of an elevator according to claim 1, characterized in that, The safety clamp lifting mechanism (12) includes a camshaft (121) rotatably mounted between two supports (11), and a square interface at one end of the camshaft (121) is connected to the U-shaped fork of the speed limiter wire rope (122).

3. The integrated weighing device for the car upper beam of an elevator according to claim 2, characterized in that, The other end of the camshaft (121) extends to the outside of the support (11). An eccentric pin is provided at this end of the camshaft (121), and the upper end of the lifting rod (123) is rotatably mounted on the eccentric pin through a bearing.

4. The integrated weighing device for the car upper beam of an elevator according to claim 3, characterized in that, The lower end of the lifting rod (123) is provided with an external thread and engages with the central copper nut of the safety clamp wedge block. The length of the external thread is greater than 15mm.

5. An integrated weighing device for the car upper beam of an elevator according to claim 1, characterized in that, The long arm end of the overload switch bracket (13) is provided with an elongated hole for fixing the micro switch, and the short arm end is rigidly connected to the web of the upper beam (10) by bolts.

6. An integrated weighing device for the car upper beam of an elevator according to claim 5, characterized in that, The guide roller (14) is rotatably connected between the web plates on both sides of the upper beam (10) via an eccentric shaft, and the overload switch bracket (13) is located between the two guide rollers (14).

7. An integrated weighing device for the car upper beam of an elevator according to claim 1, characterized in that, An elastic damping pad is provided between the upper beam (10) and the column. The elastic damping pad is cylindrical and made of polyurethane material.

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