An overload detection mechanism integrated in an elevator top beam

Abstract

The utility model discloses an overload detection mechanism integrated in elevator upper beam belongs to overload detection technical field, including car frame upper beam assembly and upper wheel beam shock pad, the upper wheel beam shock pad sets up on car frame upper beam assembly, is used for supporting elevator car, car frame upper beam assembly is provided with an overload detection mechanism, and the overload detection mechanism includes an overload switch and a trigger piece with overload switch linkage, when the load of car changes, the upper wheel beam shock pad follows and occurs elastic deformation to cause the relative displacement between car and car frame upper beam assembly, and this relative displacement is used to drive trigger piece action to trigger overload switch. The utility model can provide a kind of overload detection mechanism that does not occupy pit space, measures accurate and cost controllable.

Description

Technical Field

[0001] This utility model relates to the field of overload detection technology, and in particular to an overload detection mechanism integrated into the upper beam of an elevator. Background Technology

[0002] Elevators are an indispensable vertical transportation tool in modern buildings, and their safe operation is of paramount importance. As part of the elevator safety system, the weighing device is mainly used to detect the load inside the car and prevent safety risks caused by overloading.

[0003] Currently, there are two main elevator weighing technology solutions in the industry. The first is to install the weighing device at the bottom of the car (car bottom). However, this solution occupies valuable pit space. With the development of building design, especially for applications such as villa elevators, the depth of the elevator shaft pit is often very limited, or even impossible to excavate deeply. In this case, the weighing device installed at the car bottom will cause spatial interference with other components in the pit (such as buffers), resulting in installation difficulties or even the inability to install.

[0004] The second method is the traditional rope end weighing method, which estimates the car load by detecting the tension of the elevator wire rope. Although this method does not occupy pit space, it has inherent technical defects. Since the wire rope itself has weight, the length of the suspended wire rope varies greatly when the elevator car is running to the top and bottom floors. This causes the self-weight of the wire rope to have a significant impact on the measurement results, resulting in a large measurement error. It is impossible to continuously and accurately measure the car load throughout the entire elevator operation. Utility Model Content

[0005] The purpose of this invention is to provide an overload detection mechanism that does not occupy pit space, provides accurate measurements, and has controllable costs.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an overload detection mechanism integrated into the upper beam of an elevator, comprising a car frame upper beam assembly and an upper wheel beam shock absorber, wherein the upper wheel beam shock absorber is disposed on the car frame upper beam assembly for supporting the elevator car; An overload detection mechanism is provided on the upper beam assembly of the car frame. The overload detection mechanism includes an overload switch and a trigger that is linked to the overload switch. When the load on the car changes, the upper wheel beam shock absorber undergoes elastic deformation, thereby causing a relative displacement between the car and the upper beam assembly of the car frame. This relative displacement is used to drive the trigger to activate the overload switch.

[0007] As a further description of the above technical solution: the car frame upper beam assembly includes two parallel upper beams and a crossbeam assembly for connecting the two upper beams; The crossbeam assembly includes a first crossbeam and a second crossbeam.

[0008] As a further description of the above technical solution: the overload detection mechanism also includes an overload switch bracket, the overload switch bracket is fixed on the upper beam, and the overload switch is installed on the overload switch bracket.

[0009] As a further description of the above technical solution: the trigger is a ramming plate, one end of which is mounted on the upper beam, and one side of which corresponds to the contact of the overload switch.

[0010] As a further description of the above technical solution: when the car is under normal load or no load, a preset gap is maintained between the impact plate and the contact of the overload switch.

[0011] As a further description of the above technical solution: the upper wheel beam shock-absorbing pad is made of rubber.

[0012] As a further description of the above technical solution: the upper beam is also integrated with a safety clamp lifting structure.

[0013] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: 1. The entire overload detection mechanism is integrated into the upper beam of the car frame, without occupying any space at the bottom of the car or in the pit of the hoistway. This solves the problem of the dependence of traditional car bottom weighing devices on the depth of the pit, making it perfectly adaptable to projects with limited space, such as villa elevators or elevators added to old buildings with very shallow pits. It has strong engineering applicability.

[0014] 2. Based on the elastic deformation of the shock-absorbing pad caused by changes in car load, the switch is triggered, avoiding the problem of huge measurement errors at the top and bottom floors caused by changes in the self-weight of the steel wire rope in traditional rope end weighing, and ensuring stable and reliable overload detection throughout the entire elevator travel.

[0015] 3. The adoption of standard overload switches or micro switches, which are simple in structure, mature in technology and low in price, replaces the expensive and complex pressure sensors or load cells commonly used in the existing technology. This significantly reduces the manufacturing cost of the weighing system itself, simplifies the installation and commissioning process and subsequent maintenance, and brings significant economic benefits to the elevator as a whole. Attached Figure Description

[0016] Figure 1 A perspective view of the present invention is shown; Figure 2 A top view of the present invention is shown; Figure 3 A side view of the present invention is shown; Figure 4 A front view of the present invention is shown.

[0017] Legend: 10. Top beam; 11. First crossbeam; 12. Second crossbeam; 13. Impact plate; 14. Overload switch bracket; 15. Upper wheel beam shock absorber; 16. Safety clamp lifting structure. Detailed Implementation

[0018] 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.

[0019] Please see Figures 1-4 This utility model provides a technical solution: an overload detection mechanism integrated into the elevator upper beam. The core of this device is a structurally modified elevator frame upper beam assembly, such as... Figure 3 and Figure 4 As shown, the assembly includes two parallel upper beams 10, which are securely connected by a crossbeam assembly.

[0020] The crossbeam assembly specifically includes two larger first crossbeams 11 and two smaller second crossbeams 12. The upper beam 10 and the crossbeam assembly together form the load-bearing structure at the top of the car frame, providing stable support for the car.

[0021] Upper beam 10 is provided with upper wheel beam damping pads 15. In this embodiment, the upper wheel beam damping pads 15 are preferably made of rubber material with good elasticity and buffering performance. The weight of the elevator car (not shown in the figure) is transferred to the upper beam assembly of the car frame through these upper wheel beam damping pads 15.

[0022] The upper beam 10 integrates an overload detection mechanism, which mainly consists of an overload switch bracket 14, a standard overload switch installed on the overload switch bracket 14, and a trigger element; the trigger element is a slam plate 13.

[0023] The overload switch bracket 14 is fixed to the inside of the upper beam 10. The overload switch is mounted on the overload switch bracket 14 and includes an electrical contact that can be triggered by mechanical force.

[0024] One end of the impact plate 13 is mounted on the upper beam 10, and the bottom surface of the impact plate 13 corresponds to the contact of the overload switch and maintains a preset gap with it. A safety clamp lifting structure 16 is also integrated on one side of the upper beam 10.

[0025] When the car is empty or carrying passengers, the total weight of the car acts on the upper beam 10 through the upper wheel beam damping pad 15, causing the upper wheel beam damping pad 15 to produce a certain initial compression deformation. At this time, there is a preset gap between the bottom surface of the impact plate 13 and the contact of the overload switch. The switch does not operate, the elevator control system determines that it is in a normal state, and the elevator can operate normally.

[0026] As the load inside the car increases, the pressure applied to the upper wheel beam damping pad 15 increases accordingly. According to its elastic properties, the upper wheel beam damping pad 15 will be further compressed and its thickness will decrease. This results in a small, vertically downward relative displacement of the car body relative to the upper beam assembly of the car frame.

[0027] This tiny relative displacement will push the impact plate 13 downward through the point of action of the connection structure with the car (not shown in the figure). As the load continues to increase, the lower end of the impact plate 13 gradually approaches and eventually presses down the overload switch contact.

[0028] When the load inside the car reaches or exceeds the designed rated load, the compression of the upper wheel beam damping pad 15 reaches a critical value, which makes the descent of the impact plate 13 sufficient to stably trigger the overload switch. After the switch is triggered, it will output an electrical signal to the elevator main control system. After receiving this overload signal, the control system will immediately execute the preset safety program, such as keeping the elevator door open, issuing an audible and visual alarm, and prohibiting the elevator from starting and running, thereby effectively preventing safety accidents caused by overload.

[0029] The entire weighing and detection mechanism is integrated into the upper beam of the car frame, which does not occupy the space of the car bottom and pit at all. This solves the installation problem of traditional car bottom weighing devices and is especially suitable for villa elevators or old building renovation projects with extremely limited pit depth.

[0030] The detection principle of this device is based on the direct relative displacement between the car and the car frame, which can accurately reflect the actual load changes inside the car. It fundamentally avoids the inherent defects of traditional rope-end weighing methods, which have large measurement errors at the top and bottom floors due to the weight of the wire rope changing with the floor. It achieves high-precision overload detection throughout the entire elevator operation process.

[0031] This solution uses standard microswitches or overload switches that are simple in structure, mature in technology, and low in cost, replacing the expensive and complex pressure sensors or load cells in traditional solutions. This significantly reduces the manufacturing cost and maintenance difficulty of the system, making it highly economical.

[0032] 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 overload detection mechanism integrated in an elevator top beam, characterized in that, It includes a car frame upper beam assembly and an upper wheel beam shock absorber (15), wherein the upper wheel beam shock absorber (15) is disposed on the car frame upper beam assembly and is used to support the elevator car; An overload detection mechanism is provided on the upper beam assembly of the car frame. The overload detection mechanism includes an overload switch and a trigger that is linked to the overload switch. When the load on the car changes, the upper wheel beam damping pad (15) undergoes elastic deformation, thereby causing a relative displacement between the car and the upper beam assembly of the car frame. This relative displacement is used to drive the trigger to activate the overload switch.

2. An overload detection mechanism integrated in an elevator overhead beam according to claim 1, characterized in that: The car frame upper beam assembly includes two parallel upper beams (10) and a crossbeam assembly for connecting the two upper beams (10); The crossbeam assembly includes a first crossbeam (11) and a second crossbeam (12).

3. An overload detection mechanism integrated in an elevator overhead beam according to claim 1, characterized in that: The overload detection mechanism also includes an overload switch bracket (14), which is fixed on the upper beam (10), and the overload switch is installed on the overload switch bracket (14).

4. An overload detection mechanism integrated in an elevator overhead beam according to claim 1, characterized in that: The trigger is a ram (13), one end of which is mounted on the upper beam (10), and one side of which corresponds to the contact of the overload switch.

5. An overload detection mechanism integrated into an elevator overhead beam according to claim 4, characterized in that: When the car is under normal load or no load, there is a preset gap between the impact plate (13) and the contact of the overload switch.

6. An overload detection mechanism integrated into an elevator overhead beam according to claim 1, characterized in that: The upper wheel beam shock absorber pad (15) is made of rubber.

7. An overload detection mechanism integrated in an elevator overhead beam according to claim 2, characterized in that: The upper beam (10) is also integrated with a safety clamp lifting structure (16).

Images