Vertical Circulating Elevator Reverse Operation Detection System and Method

Abstract

The present invention discloses a reverse running detection system and method for a vertical circulating elevator. The main design concept of the present invention is to propose to use four metal induction devices and arrange them evenly in a circle outside the sprocket, and corresponding to the metal components fixed on the sprocket, to realize signal induction of the rotation direction of the sprocket, so as to accurately detect the running position of the elevator sprocket, and then determine whether the elevator is running forward or backward. Once it is detected that the elevator sprocket rotates in reverse, the elevator can be controlled to brake and stop immediately, and an alarm signal is output. Whether the reverse rotation is caused by electrical reasons, or by reasons such as overweight overload and mechanical slipping, the present invention can quickly detect the reverse running state of the elevator, trigger the original mechanism to brake, and timely control the elevator to stop falling.

Description

Technical Field

[0001] The present invention relates to the field of cigarette manufacturing, and particularly to a reverse running detection system and method for a vertical circulating elevator. Background Art

[0002] The cigarette box elevator, also known as the vertical circulating elevator, is used to vertically lift the produced finished cigarette boxes to the floors at a height of 12 meters or 20 meters according to the requirements of logistics production. The lifting function of this equipment relies on the chain to drive the multi-layer racks to circulate vertically upward through the sprocket. During operation, the sprocket can only rotate in one direction, and the structure of the equipment does not allow the sprocket to reverse. Once reversed, the racks installed on the four chains will tilt and fall, and the chain will skip teeth, easily causing the chain to break. Especially, the finished cigarette pieces will fall from a high place, resulting in serious safety and production accidents.

[0003] However, the operation of this equipment relies on an ordinary three-phase motor to provide power. When there are electrical problems such as motor phase loss, motor enable circuit failure, and motor operation contactor contact, or mechanical slippage, and the goods lifted by the elevator are overweight, the motor will be forced to reverse under the action of gravity, resulting in the aforementioned production safety accidents. Moreover, in the actual production process, there has been a situation where due to the large flow of finished cigarette pieces and the overloaded load of the elevator, when the elevator is stopped and restarted, the braking device of the elevator is released, and the motor reverses under the action of the gravity of the goods, resulting in the sudden drop of the elevator and then serious damage to the equipment and the finished cigarette pieces. Summary of the Invention

[0004] In view of the above, the present invention aims to provide a reverse running detection system and method for a vertical circulating elevator to solve the aforementioned technical problems.

[0005] The technical solution adopted by the present invention is as follows:

[0006] In the first aspect, the present invention provides a reverse running detection system for a vertical circulating elevator, which includes: a metal component fixedly arranged on the outer surface of the sprocket of the vertical circulating elevator, and four metal induction devices arranged outside the sprocket. The induction ends of the metal induction devices are located on the same circumferential plane parallel to the outer surface of the sprocket, and the adjacent two metal induction devices are distributed at an angle of 90 degrees.

[0007] There is a preset induction gap between the induction end of each metal induction device and the metal component, which is used to obtain an ordered pulse signal generated when the sprocket rotates through the metal component, so that the original machine controller can detect the reverse state of the sprocket.

[0008] In at least one possible implementation manner, the metal induction device is electrically connected to the original machine controller through a preset control device.

[0009] In at least one possible implementation manner, the control device includes a programmable controller.

[0010] In at least one possible implementation manner, the metal component includes a screw screwed into a threaded hole provided on the outer surface of the sprocket.

[0011] In at least one possible implementation manner, the four metal sensing devices are arranged on the outer side of the sprocket through a mounting bracket.

[0012] In at least one possible implementation manner, the metal sensing device is a proximity switch.

[0013] In at least one possible implementation manner, the detection system further includes an alarm device electrically connected to the original machine controller, and the alarm device is used to output a warning signal when it detects that the sprocket runs in reverse.

[0014] In a second aspect, the present invention provides a method for detecting reverse operation of a vertical circulating elevator, which includes:

[0015] Step S1: When any current metal sensing device detects a metal component on the sprocket, assign the received pulse signal to the corresponding current metal sensing device with a quantization value of 1, and at the same time assign the previous metal sensing device of the current metal sensing device to 0 in a preset order;

[0016] Step S2: During the operation of the elevator, continuously calculate the sum of the assignments of the four metal sensing devices;

[0017] Step S3: When the sum of the assignments is greater than or equal to a preset threshold, it is determined that the sprocket rotates in reverse.

[0018] In at least one possible implementation manner, after it is determined that the sprocket rotates in reverse, trigger the sprocket brake and control the vertical circulating elevator to stop.

[0019] In at least one possible implementation manner, after it is determined that the sprocket rotates in reverse, trigger and output a warning signal.

[0020] The main design concept of the present invention is that, in view of the fact that the current vertical smoke box elevator does not have the functions of detecting the falling of the elevator and the reverse rotation of the lifting motor, when the elevator suddenly falls or the motor rotates in reverse during normal operation or at the moment of starting up after shutdown, the device cannot detect the reverse movement of the elevator, and it is difficult to brake and stop in time, which is likely to cause situations such as sprocket teeth disengagement, chain breakage, and mechanical collision, and even serious production and safety accidents. To solve this problem, the present invention proposes to use four metal induction devices and arrange them evenly in a circle outside the sprocket, and corresponding to the metal components fixed on the sprocket, to realize the signal induction of the rotation direction of the sprocket, so as to accurately detect the running position of the elevator sprocket, and then determine the forward or reverse running of the elevator. Once it is detected that the elevator sprocket rotates in reverse, the elevator can be controlled to brake and stop immediately, and an alarm signal is output. Whether the reverse rotation is caused by electrical reasons, or by overweight overload and mechanical slipping, etc., the present invention can quickly detect the reverse running state of the elevator, and can trigger the original mechanism to brake and timely control the elevator to stop falling. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described below in conjunction with the drawings, where:

[0022] Figure 1 is a schematic diagram of the installation position of the reverse running detection system of the vertical circulation elevator provided by an embodiment of the present invention;

[0023] Figure 2 is a schematic layout diagram of the metal induction device provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention, and cannot be construed as a limitation of the present invention.

[0025] The present invention proposes an embodiment of a reverse running detection system for a vertical circulation elevator. Specifically, as shown in FIGS. Figure 1 and Figure 2 it includes: a metal component 1 fixed on the outer surface of the sprocket 200 of the vertical circulation elevator 100, and four metal induction devices 2 arranged outside the sprocket 200. The induction ends of each metal induction device 2 are located on the same circumferential plane parallel to the outer surface of the sprocket 200, and the adjacent two metal induction devices 1 are distributed at an angle of 90 degrees;

[0026] There is a preset induction gap between the induction end of each metal induction device 2 and the metal component 1, which is used to obtain an ordered pulse signal generated when the sprocket 200 rotates through the metal component 1, so that when the sprocket 200 reverses, the braking device is triggered to act by the original machine controller.

[0027] Further, the metal induction device 2 is electrically connected to the original machine controller through a preset control device.

[0028] Thus, the control device can be a PLC programmable controller.

[0029] Further, the metal component 1 includes a screw connected to a threaded hole formed on the outer surface of the sprocket 200.

[0030] Further, in actual operation, the four metal induction devices 2 are arranged on the outside of the sprocket 200 through a mounting bracket.

[0031] Further, the metal induction device 2 preferably uses a proximity switch.

[0032] Finally, it can be added that the system can also include an alarm device electrically connected to the original machine controller, which is used to output a warning signal when the reverse operation of the sprocket is detected.

[0033] Those skilled in the art can understand that four metal induction devices arranged at a 90-degree angle will inevitably generate induction pulses in an orderly manner when the sprocket rotates. Therefore, once a reverse rotation occurs, the order of the high levels of the four induction devices will be reversed, so that the reverse rotation situation can be detected in time. Furthermore, the sprocket braking can be triggered in time according to this detection result, and the entire lifting equipment can be controlled to stop and alarm.

[0034] On this principle basis, in some preferred embodiments of the present invention, corresponding to the foregoing system, there is provided an embodiment of a method for detecting the reverse operation of a vertical circulating elevator, including:

[0035] Step S1: When any metal induction device detects the metal component on the sprocket, the received pulse signal is assigned a quantization value of 1 to the corresponding current metal induction device, and at the same time, the previous metal induction device of the current metal induction device is assigned 0 according to a preset order;

[0036] Step S2: During the operation of the elevator, continuously calculate the sum of the assignments of the four metal induction devices;

[0037] Step S3: When the sum of the assignments is greater than or equal to a preset threshold, it is determined that the sprocket has reversed.

[0038] Further, after it is determined that the sprocket has reversed, trigger the sprocket braking and control the vertical circulating elevator to stop.

[0039] Based on this, after it is determined that the sprocket wheel rotates in reverse, a warning signal is also synchronously triggered for output.

[0040] For the convenience of description, the foregoing four metal induction devices are respectively named A, B, C, and D. Under normal conditions, the sprocket wheel of the hoist rotates counterclockwise. When the hoist is operating normally, the order in which the four metal induction devices sense a high level from the metal components must be in a cycle of A, B, C, D in sequence. Thus, the detection results of the four induction devices A, B, C, and D can be characterized by quantization values, corresponding to SA, SB, SC, and SD respectively.

[0041] And the sum S = SA + SB + SC + SD is used as the reverse judgment value. In the normal rotation operation state, when A senses a high level, SD is reset to 0 and SA is assigned a value of 1; when B detects a pulse, SA is reset to 0 and SB is assigned a value of 1; when C detects a pulse, SB is reset to 0 and SC is assigned a value of 1; when D detects a pulse, SC is reset to 0 and SD is assigned a value of 1.

[0042] That is to say, the pulse signal detected by each metal induction device causes the previous induction device to be reset to 0 and itself to be set to 1.

[0043] Therefore, when the hoist is operating normally, the reverse judgment value S can only be equal to 1; when the sprocket wheel rotates in reverse, for example, when the detection order of the metal induction devices changes from B to A, since A cannot reset the value SB of B to 0, in this case, SA and SB will both be 1 at the same time, and the reverse judgment value S will also be greater than or equal to 2. That is, once the reverse judgment value S is greater than or equal to 2, it is determined that the sprocket wheel is in a reverse state and the hoist is falling. At this time, the original controller of the hoist can trigger the braking device to take effect, stop the reverse rotation, stop the hoist, and can also output a warning signal.

[0044] In summary, the main design concept of the present invention is that, in view of the fact that the current vertical cigarette box elevator does not have the function of detecting the falling of the elevator and the reverse rotation of the lifting motor, when the elevator suddenly falls or the motor rotates in reverse during normal operation or at the moment of starting up after shutdown, the device cannot detect the reverse movement of the elevator, making it difficult to brake and stop in time, and likely to cause situations such as sprocket tooth disengagement, chain breakage, and mechanical collision, or even serious production and safety accidents. To address this problem, the present invention proposes to use four metal induction devices, which are evenly arranged in a circle outside the sprocket and correspond to the metal components fixed on the sprocket, to achieve signal induction of the rotation direction of the sprocket, thereby accurately detecting the running position of the elevator sprocket, and then determining whether the elevator is running forward or backward. Once it detects that the elevator sprocket rotates in reverse, it can immediately control the elevator to brake and stop, and output an alarm signal. Whether the reverse rotation is caused by electrical reasons, or by overweight, overload, mechanical slipping, etc., the present invention can quickly detect the reverse running state of the elevator, trigger the original mechanism to brake, and timely control the elevator to stop falling.

[0045] In the embodiments of the present invention, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent the situation of A existing alone, A and B existing simultaneously, or B existing alone. Here, A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after. "At least one of the following" and its similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, and c can represent: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, and c can be single or multiple.

[0046] The above has detailed the structure, features, and effects of the present invention based on the illustrated embodiments. However, the above are only the preferred embodiments of the present invention. It should be noted that for the technical features involved in the above embodiments and their preferred modes, those skilled in the art can reasonably combine and match them into various equivalent solutions without departing from or changing the design concept and technical effects of the present invention. Therefore, the present invention is not limited by the scope shown in the drawings. Any changes made in accordance with the concept of the present invention, or modified into equivalent embodiments with equivalent changes, are still within the spirit covered by the specification and the drawings, and should be within the protection scope of the present invention.

Claims

1. A detection method for a reverse operation detection system of a vertical circulating elevator, characterized in that, The detection system includes: a metal component fixedly arranged on the outer surface of the sprocket of the vertical circulating elevator, and four metal induction devices arranged outside the sprocket. The induction ends of the metal induction devices are located on the same circumferential surface parallel to the outer surface of the sprocket, and the adjacent two metal induction devices are distributed at an angle of 90 degrees; there is a preset induction gap between the induction end of each metal induction device and the metal component, which is used to obtain an orderly pulse signal generated when the sprocket rotates through the metal component, so that the original machine controller can detect the reverse state of the sprocket; The detection method includes: Step S1: When any current metal induction device detects the metal component on the sprocket, assign the received pulse signal with a quantization value of 1 to the corresponding current metal induction device, and at the same time assign the previous metal induction device of the current metal induction device to 0 in a preset order; Step S2: Continuously calculate the sum of the assigned values of the four metal induction devices during the operation of the elevator; Step S3: When the sum of the assigned values is greater than or equal to a preset threshold, and the reverse judgment value can only be equal to 1, it is determined that the sprocket is reversed.

2. The detection method according to claim 1, characterized in that After it is determined that the sprocket is reversed, trigger the sprocket brake and control the vertical circulating elevator to stop.

3. The detection method according to claim 2, characterized in that After it is determined that the sprocket is reversed, trigger the output of a warning signal.

4. The detection method according to claim 1, wherein The metal induction device is electrically connected to the original machine controller through a preset control device.

5. The detection method according to claim 4, wherein The control device includes a programmable controller.

6. The detection method according to claim 1, wherein The metal component includes a screw screwed into a threaded hole provided on the outer surface of the sprocket.

7. The detection method according to claim 1, characterized in that The four metal induction devices are arranged outside the sprocket through a mounting bracket.

8. The detection method according to claim 1, characterized in that The metal induction device is a proximity switch.

9. The detection method according to any one of claims 1 to 8, characterized in that, The detection system further includes an alarm device electrically connected to the original machine controller. The alarm device is used to output a warning signal when it detects the reverse operation of the sprocket.

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