Elevator overload detection device

Abstract

The utility model discloses an elevator overload detection device which comprises a lift car frame and an elevator lift car, the elevator lift car is located on the inner side of the lift car frame, the bottom of the elevator lift car is connected with the lift car frame through a plurality of damping mechanisms, an installation groove is formed in the bottom of the lift car frame, and a displacement measuring mechanism is installed in the installation groove. Through the arrangement of the pull rod type linear displacement sensor, when the load of the elevator car is increased, the pull rod type linear displacement sensor moves downwards and compresses the damping mechanism, so that a pull rod of the pull rod type linear displacement sensor is pushed to move downwards, and an electric signal output by the pull rod type linear displacement sensor is changed; the installation height of the pull rod type linear displacement sensor is adjusted in the installation groove through the linear driving mechanism, and the pre-stretching amount of the pull rod of the pull rod type linear displacement sensor can be adjusted. Therefore, the range of the load capacity of the elevator car can be conveniently adjusted under the condition that a control program is not modified, and operation is easy and convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of elevators, in particular to an elevator overload detection device. Background Art

[0002] The elevator overload detection device belongs to a kind of elevator safety protection device, which can detect the load of the elevator. The commonly used elevator overload detection device at present uses rubber shock pads to support the elevator car in the car frame, and a micro switch is installed under the elevator car. When the load of the elevator car increases, the rubber shock pads will be compressed and deformed continuously, and the elevator car will move downward. When the elevator car is overloaded, the micro switch will be triggered to achieve the purpose of elevator overload detection. Generally, two micro switches are set in such overload detection devices. One micro switch acts when the elevator reaches 80% of the load, and the elevator is confirmed to run at full load. The elevator only responds to the calls inside the car until it reaches the call station. The other micro switch acts when the elevator reaches 110% of the load capacity, and the elevator is confirmed to be overloaded. The elevator stops running, keeps the door open, and gives a warning signal.

[0003] Although the above-mentioned prior art has a simple structure and high safety, it cannot accurately monitor the load of the elevator, and it is not easy to replace the micro switch after it is damaged. In addition, since the position of the micro switch is fixed, it is not convenient to adjust the range of the elevator load capacity, so it needs to be improved. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an elevator overload detection device to solve the problems put forward in the above background art.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] An elevator overload detection device includes a car frame and an elevator car. The elevator car is located inside the car frame, and the bottom of the elevator car is connected to the car frame through a plurality of shock absorption mechanisms. An installation groove is provided at the bottom of the car frame, and a displacement measurement mechanism is installed in the installation groove. The displacement measurement mechanism includes a pull rod type linear displacement sensor installed in the installation groove through a linear drive mechanism, and the pull rod of the pull rod type linear displacement sensor is detachably connected to the bottom of the elevator car.

[0007] As a further solution of the present utility model: The linear driving mechanism includes a bolt rotatably installed in the installation groove through a bearing seat. A wire block is sleeved on the outer wall of the bolt in a matching manner. A threaded hole adapted to the bolt is provided on the wire block. The pull-rod type linear displacement sensor is fixedly connected to the wire block by screws. The pull rod of the pull-rod type linear displacement sensor is sleeved with a nut through an external thread. A transition plate is fixedly connected to the outer wall of the nut. The transition plate is fixedly connected to the bottom of the elevator car by screws.

[0008] As a further solution of the present utility model: A slide rail is slidably penetrated through the outer wall of the wire block through a chute. The slide rail is fixedly connected to the inner wall of the installation groove.

[0009] As a further solution of the present utility model: The car frame includes a bottom support. The installation groove is opened on the bottom support. Two columns are symmetrically and fixedly connected to the top of the bottom support. The elevator car is located between the two columns. The tops of the two columns are fixedly connected together with a top beam. Guide rails are fixedly connected to the outer walls of the columns. Sliders are slidably sleeved on the outer walls of the guide rails. The sliders are all fixedly connected to the elevator car. A clamping plate is fixedly connected to the outer wall of the column above the elevator car.

[0010] As a further solution of the present utility model: The shock absorption mechanism includes a rubber block. Connecting plates are fixedly connected to the top and bottom of the rubber block. The bottom of the elevator car and the top of the bottom support are fixedly connected to the corresponding connecting plates by screws.

[0011] Compared with the prior art, the beneficial effects of the present utility model are:

[0012] With the setting of the pull-rod type linear displacement sensor in the present utility model, when the load of the elevator car increases, it will move downward and compress the shock absorption mechanism, thereby pushing the pull rod of the pull-rod type linear displacement sensor downward, thereby changing the electrical signal output by the pull-rod type linear displacement sensor outward, so as to achieve the purpose of real-time monitoring of the load of the elevator car. By adjusting the installation height of the pull-rod type linear displacement sensor in the installation groove through the linear driving mechanism, the pre-extension amount of the pull rod of the pull-rod type linear displacement sensor can be adjusted, so as to facilitate the adjustment of the load range of the elevator car without modifying the control program, and the operation is simple and convenient. Description of the Drawings

[0013] Figure 1 It is a structural schematic diagram of an elevator overload detection device.

[0014] Figure 2 It is Figure 1 The enlarged view of part A in

[0015] Figure 3It is a schematic structural diagram of a wire block in an elevator overload detection device.

[0016] Among them, the car frame 1, the bottom support 2, the column 3, the top beam 4, the shock absorption mechanism 5, the rubber block 6, the connecting plate 7, the clamping plate 8, the guide rail 9, the slider 10, the elevator car 11, the installation groove 12, the displacement measuring mechanism 13, the pull-rod type linear displacement sensor 14, the nut 15, the transition plate 16, the bolt 17, the wire block 18, the threaded hole 19, the slide rail 20, the chute 21. Specific implementation mode

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] Please refer to Figures 1 to 3 , in the embodiment of the present invention, an elevator overload detection device includes a car frame 1 and an elevator car 11. The elevator car 11 is located inside the car frame 1, and the bottom of the elevator car 11 is connected to the car frame 1 through a plurality of shock absorption mechanisms 5. An installation groove 12 is provided at the bottom of the car frame 1, and a displacement measuring mechanism 13 is installed in the installation groove 12. The displacement measuring mechanism 13 includes a pull-rod type linear displacement sensor 14 installed in the installation groove 12 through a linear driving mechanism. The pull rod of the pull-rod type linear displacement sensor 14 is detachably connected to the bottom of the elevator car 11. The pull-rod type linear displacement sensor 14 is also called an electronic ruler, which is essentially a sliding rheostat and can convert the linear displacement amount of the pull rod into an electrical signal.

[0019] By adopting the above scheme, the present invention utilizes the setting of the pull-rod type linear displacement sensor 14. When the load of the elevator car 11 increases, it will move downward and compress the shock absorption mechanism 5, thereby pushing the pull rod of the pull-rod type linear displacement sensor 14 to move downward, thereby changing the electrical signal output by the pull-rod type linear displacement sensor 14 to achieve the purpose of real-time monitoring of the load of the elevator car 11. By adjusting the installation height of the pull-rod type linear displacement sensor 14 in the installation groove 12 through the linear driving mechanism, the pre-extension amount of the pull rod of the pull-rod type linear displacement sensor 14 can be adjusted, so as to conveniently adjust the load range of the elevator car 11 without modifying the control program, and the operation is simple and convenient.

[0020] Specifically combined with Figure 2 and Figure 3, in an embodiment of the present utility model, the linear drive mechanism includes a bolt 17 rotatably installed in the installation groove 12 through a bearing block. A thread block 18 is sleeved on the outer wall of the bolt 17. A threaded hole 19 adapted to the bolt 17 is provided on the thread block 18. The pull-rod linear displacement sensor 14 is fixedly connected to the thread block 18 by screws. The pull rod of the pull-rod linear displacement sensor 14 is sleeved with a nut 15 through external threads. A transition plate 16 is fixedly connected to the outer wall of the nut 15. The transition plate 16 is fixedly connected to the bottom of the elevator car 11 by screws.

[0021] By removing the screws for connecting the thread block 18 and the pull-rod linear displacement sensor 14, and removing the screws for connecting the elevator car 11 and the transition plate 16, the pull-rod linear displacement sensor 14 can be removed, thus facilitating faster replacement of the damaged pull-rod linear displacement sensor 14. By rotating the screw 17, the installation height of the pull-rod linear displacement sensor 14 can be adjusted by the cooperation of the screw 17 and the thread block 18, and the operation is simple and convenient.

[0022] Specifically combined with Figure 2 and Figure 3 , on the basis of the previous embodiment, a slide rail 20 is slidably penetrated through the outer wall of the thread block 18 through a chute 21, and the slide rail 20 is fixedly connected to the inner wall of the installation groove 12.

[0023] Through the cooperation of the slide rail 20 and the chute 21, the thread block 18 can be guided in the installation groove 12, thereby improving the stability of the movement of the pull-rod linear displacement sensor 14.

[0024] Specifically combined with Figure 1 , in an embodiment of the present utility model, the car frame 1 includes a bottom support 2. The installation groove 12 is opened on the bottom support 2. Two columns 3 are symmetrically and fixedly connected to the top of the bottom support 2. The elevator car 11 is located between the two columns 3. The tops of the two columns 3 are jointly fixedly connected with a top beam 4. Guide rails 9 are fixedly connected to the outer walls of the columns 3. Sliders 10 are slidably sleeved on the outer walls of the guide rails 9. The sliders 10 are fixedly connected to the elevator car 11. Clamping plates 8 are fixedly connected to the outer walls of the columns 3 above the elevator car 11.

[0025] Through the cooperation of the guide rail 9 and the slider 10, the elevator car 11 can be guided in the car frame 1 to prevent the elevator car 11 from having a lateral displacement relative to the car frame 1. Through the arrangement of the two clamping plates 8, the elevator car 11 can be limited in the vertical direction to prevent the elevator car 11 from moving upward relative to the car frame 1 when descending.

[0026] Specifically combined with Figure 1, in an embodiment of the present utility model, the shock absorption mechanism 5 includes a rubber block 6. Both the top and bottom of the rubber block 6 are fixedly connected with connecting plates 7. The bottom of the elevator car 11 and the top of the bottom support 2 are fixedly connected to the corresponding connecting plates 7 by screws, so as to facilitate the replacement of the shock absorption mechanism 5.

[0027] Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An elevator overload detection device, characterized in that: The invention comprises a car frame (1) and an elevator car (11), wherein the elevator car (11) is located inside the car frame (1), and the bottom of the elevator car (11) is connected to the car frame (1) via a plurality of shock absorbing mechanisms (5), and a mounting groove (12) is provided at the bottom of the car frame (1), and a displacement measuring mechanism (13) is installed in the mounting groove (12), and the displacement measuring mechanism (13) comprises a pull rod type linear displacement sensor (14) installed in the mounting groove (12) via a linear drive mechanism, and the pull rod of the pull rod type linear displacement sensor (14) is detachably connected to the bottom of the elevator car (11).

2. An elevator overload detection device according to claim 1, characterized in that: The linear drive mechanism comprises a bolt (17) which is rotatably mounted in a mounting groove (12) via a bearing seat, the outer wall of the bolt (17) is fitted with a threaded block (18), the threaded block (18) is provided with a threaded hole (19) which matches the bolt (17), the pull rod type linear displacement sensor (14) is fixedly connected to the threaded block (18) via a screw, the pull rod of the pull rod type linear displacement sensor (14) is fitted with a nut (15) via an external thread, the outer wall of the nut (15) is fixedly connected with a transition plate (16), and the transition plate (16) is fixedly connected to the bottom of the elevator car (11) via screws.

3. An elevator overload detection device according to claim 2, characterized in that: The outer wall of the wire block (18) is slidably provided with a slide rail (20) through a slide groove (21), and the slide rail (20) is fixedly connected to the inner wall of the installation groove (12).

4. An elevator overload detection device according to claim 1, characterized in that: The car frame (1) comprises a base (2), the mounting groove (12) is provided on the base (2), the top of the base (2) is symmetrically fixedly connected to two columns (3), the elevator car (11) is located between the two columns (3), the top ends of the two columns (3) are commonly fixedly connected to a top beam (4), the outer walls of the columns (3) are fixedly connected to guide rails (9), the outer walls of the guide rails (9) are slidably sleeved with sliders (10), the sliders (10) are fixedly connected to the elevator car (11), and the outer walls of the columns (3) located above the elevator car (11) are fixedly connected to a clamping plate (8).

5. An elevator overload detection device according to claim 4, characterized in that: The shock absorbing mechanism (5) comprises a rubber block (6), the top and bottom of the rubber block (6) are fixedly connected to a connecting plate (7), and the bottom of the elevator car (11) and the top of the base (2) are fixedly connected to the corresponding connecting plate (7) via screws.

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