Weighing and overload device of elevator

Abstract

The utility model provides a weighing overload device of an elevator. The weighing overload device comprises a PLC; an analog-to-digital conversion module, wherein the analog-to-digital conversion module is connected with the PLC; the force sensor is connected with the analog-to-digital conversion module, and the force sensor is installed between one end of the chain and the rack and used for collecting the pulling force of the chain; the upper limiting sensor is connected with the PLC, and when the lifting platform ascends to an upper limit position, the upper limiting sensor is triggered; the lifting reversing valve is connected with the PLC (Programmable Logic Controller); according to the utility model, the tension force received by the chain is monitored in real time by arranging the force sensor between the chain and the rack, and when the load of the chain is higher than the set load, the PLC makes a corresponding control decision, so that the safety of equipment and personnel is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of lift, specifically relates to a lift weighing overload device. BACKGROUND

[0002] The lift is a kind of common lifting transport tool, is suitable for the goods transport between floors of high floor factory building, hotel, office building, shopping mall and so on.

[0003] The principle of lift is to push the chain wheel up and down by controlling the extension of hydraulic cylinder, the chain is sleeved on the chain wheel, one end of the chain is fixedly connected with rack, the other end of the chain is fixedly connected with lifting platform, and the up and down movement of chain wheel drives the lifting platform at one end of chain to move up and down, to realize the material transport of floor.

[0004] In the prior art, the utility model discloses a kind of stable lift based on hydraulic system, which drives chain wheel up and down by hydraulic cylinder, and chain wheel drives lifting platform up and down by chain;In the above prior art, the load of chain cannot be monitored in real time, and when the actual load of chain is greater than design load in use, chain, hydraulic pipeline and other mechanical components can be damaged, and even personnel casualty and property loss can be caused.

[0005] Therefore, it is necessary to design a kind of lift weighing overload device for real-time monitoring of the load of chain, to avoid lifting platform lifting when the actual load is greater than design load, to ensure the safety of equipment and personnel to solve the technical problems faced at present. INVENTION CONTENTS

[0006] In view of the deficiencies in the prior art, the utility model provides a kind of lift weighing overload device for real-time monitoring of the load of chain, to avoid lifting platform lifting when the actual load is greater than design load, to ensure the safety of equipment and personnel.

[0007] The technical scheme of the utility model is as follows: the lift weighing overload device comprises: PLC;Analog-digital conversion module, the analog-digital conversion module is connected with the PLC;Force sensor, the force sensor is connected with the analog-digital conversion module, the force sensor is installed between one end of chain and rack, and is used to collect the tension of chain;Upper limit sensor, the upper limit sensor is connected with the PLC, and the upper limit sensor is triggered when lifting platform rises to upper limit position;Lifting reversing valve, the lifting reversing valve is connected with the PLC.

[0008] Further, the elevator overload weighing device further comprises clamping oil cylinders, the clamping oil cylinders are symmetrically arranged on the racks on both sides of the lifting platform in the upper limit position, a clamping reversing valve is connected to the clamping oil cylinders, the clamping reversing valve is connected with the PLC, and the clamping reversing valve controls the clamping oil cylinders to clamp or release the lifting platform according to the control signal output by the PLC.

[0009] Further, the elevator overload weighing device further comprises a vibration sensor, the vibration sensor is connected with the analog-digital conversion module, and the vibration sensor is used for detecting a vibration signal of the lifting platform.

[0010] Further, a communication module is connected to the PLC, the communication module is wirelessly connected with a cloud server, and the PLC periodically sends real-time data acquired by the force sensor to the cloud server through the communication module.

[0011] Further, an alarm module is connected to the PLC, and the alarm module is used for alarming according to the control signal output by the PLC.

[0012] Further, the alarm module comprises an audible and visual alarm.

[0013] The elevator overload weighing device has the following beneficial effects:

[0014] (1) In the utility model, the force sensor arranged between the chain and the rack is used for monitoring the tension received by the chain in real time, when the load of the chain is higher than the set load, the PLC makes corresponding control decisions, and the safety of equipment and personnel is ensured.

[0015] (2) When the lifting platform is lifted, if the real-time tension value acquired by the PLC through the force sensor is greater than the set tension value, the PLC outputs a control signal to the lifting reversing valve, and the lifting oil cylinder is controlled to drive the lifting platform to descend.

[0016] (3) When the lifting platform is in the upper limit position, if the upper limit position sensor is triggered during the process of placing goods on the lifting platform, if the real-time tension value acquired by the PLC through the force sensor is greater than the set tension value, the PLC does not output a control signal to the lifting reversing valve, and the lifting platform is kept in the upper limit position. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a principle block diagram of the elevator overload weighing device in the utility model.

[0018] Figure 2 It is an installation schematic view of the clamping oil cylinder in the utility model. DETAILED DESCRIPTION

[0019] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are not intended to limit the present invention or its application or use in any way. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete, and to fully express the scope of the present invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0020] The terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] like Figure 1 As shown, the lifting platform weighing overload device includes: a PLC1; an analog-to-digital converter module 3 connected to the PLC1, which converts analog signals into digital signals; a force sensor 6 connected to the analog-to-digital converter module 3, installed between one end of the chain and the frame to collect the chain tension; an upper limit sensor 4 connected to the PLC1, triggered when the lifting platform rises to the upper limit position; and a lifting reversing valve 10 connected to the PLC1. In this embodiment, the force sensor 6, installed between the chain and the frame, detects the tension received by the chain. The system monitors the force in real time. When the load on the chain exceeds the set load, the PLC1 makes corresponding control decisions to ensure the safety of the equipment and personnel. When the lifting platform is raised, if the real-time tension value obtained by the PLC1 through the force sensor 6 is greater than the set tension value, the PLC1 outputs a control signal to the lifting reversing valve 10 to control the lifting cylinder 12 to drive the lifting platform down. When the lifting platform is at the upper limit position, during the process of placing goods on the lifting platform, the upper limit sensor 4 is triggered. If the real-time tension value obtained by the PLC1 through the force sensor 6 is greater than the set tension value, the PLC1 does not output a control signal to the lifting reversing valve 10, keeping the lifting platform at the upper limit position.

[0022] In the above embodiment, the upper limit sensor 4 is a limit switch. The limit switch is installed on the frame with its detection end facing the lifting platform. When the lifting platform rises to the correct position, it contacts the detection end of the upper limit sensor 4 and triggers it.

[0023] In some embodiments, as shown in Figure 1 and 2 The elevator overload weighing device also includes clamping oil cylinders 11 symmetrically arranged on the frame 13 on both sides of the lifting platform 14 in the upper limit position. The clamping oil cylinders 11 are connected with a clamping directional control valve 9, which is connected with the PLC 1. The clamping directional control valve 9 controls the clamping oil cylinders 11 to clamp or release the lifting platform according to the control signal output by the PLC 1. Specifically, the clamping oil cylinders 11 are even in number, such as four or six. The clamping oil cylinders 11 are evenly distributed on both sides of the lifting platform 14. The two sides of the lifting platform 14 can be provided with grooves 141 matching the end portions of the piston rods of the clamping oil cylinders 11. When the clamping oil cylinders 11 clamp the lifting platform, the end portions of the piston rods of the clamping oil cylinders 11 are inserted into the grooves 141 and clamp and fix the lifting platform 14, so that the situation that the lifting platform 14 tilts and falls due to the disconnection of the chain can be avoided. When the lifting platform is in the upper limit position and goods are placed on the lifting platform, the upper limit sensor 4 is triggered. When the real-time tension value obtained by the force sensor 6 is greater than the set tension value, the PLC 1 does not output a control signal to the lifting directional control valve 10, so that the lifting platform 14 remains in the upper limit position. At the same time, the control signal output by the PLC 1 controls the clamping oil cylinders 11 to clamp the lifting platform 14, further improving the safety.

[0024] In some embodiments, the elevator overload weighing device also includes a vibration sensor 2 connected with an analog-to-digital conversion module 3. The vibration sensor 2 is installed at the bottom of the lifting platform and is used to detect the vibration signal of the lifting platform. When the sliding between one side of the lifting platform and the frame is resisted, the lifting platform will produce abnormal vibration during the lifting or lowering process. The vibration sensor 2 identifies the abnormal vibration to ensure the safe operation of the elevator.

[0025] In some embodiments, the PLC 1 is connected with a communication module 7, which is wirelessly connected with a cloud server 5. The PLC 1 periodically sends the real-time data obtained by the force sensor 6 to the cloud server 5 through the communication module 7. After a safety accident occurs, the data stored in the cloud server 5 can be easily checked to troubleshoot the cause of the accident.

[0026] In some embodiments, the PLC1 is connected with an alarm module 8, which is used to alarm according to the control signal sent by the PLC1; when the lifting platform is lifted, if the real-time tension value obtained by the PLC1 through the force sensor 6 is greater than the set tension value, the PLC1 outputs a control signal to the lifting reversing valve 10 to control the lifting cylinder 12 to drive the lifting platform to descend, and controls the alarm module 8 to alarm overload lifting at the same time; when the lifting platform is at the upper limit position, if the upper limit sensor 4 is triggered during the process of placing goods on the lifting platform, if the real-time tension value obtained by the PLC1 through the force sensor 6 is greater than the set tension value, the PLC1 does not output a control signal to the lifting reversing valve 10, so that the lifting platform remains at the upper limit position, and the alarm module 8 is controlled to alarm overload lifting at the same time.

[0027] Specifically, the alarm module 8 includes an audible and visual alarm.

[0028] So far, the embodiments of the utility model have been described in detail. In order to avoid shielding the concept of the utility model, some details known in the art are not described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein according to the above description.

[0029] The above-described embodiments only express some implementation manners of the utility model, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the utility model patent. It should be pointed out that, for those skilled in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. An elevator overload weighing device, characterized in that, It comprises: PLC; an analog-to-digital conversion module connected with the PLC; a force sensor connected with the analog-to-digital conversion module, the force sensor being installed between one end of the chain and the rack to collect the tension of the chain; an upper limit sensor connected with the PLC, the upper limit sensor being triggered when the lifting platform rises to the upper limit position; a lifting reversing valve connected with the PLC.

2. An elevator overload device according to claim 1, characterized in that It also comprises clamping oil cylinders symmetrically arranged on the racks on both sides of the lifting platform in the upper limit position, a clamping reversing valve being connected with the clamping oil cylinders, the clamping reversing valve being connected with the PLC, and the clamping reversing valve controlling the clamping oil cylinders to clamp or release the lifting platform according to the control signal output by the PLC.

3. An elevator overload device according to claim 1, characterized in that: It also comprises a vibration sensor connected with the analog-to-digital conversion module, the vibration sensor being used to detect the vibration signal of the lifting platform.

4. An elevator overload device according to claim 1, characterized in that: A communication module is connected with the PLC, the communication module being wirelessly connected with a cloud server, and the PLC periodically sends the real-time data collected by the force sensor to the cloud server through the communication module.

5. An elevator overload device according to claim 1, characterized in that: An alarm module is connected with the PLC, the alarm module being used to alarm according to the control signal output by the PLC.

6. An elevator overload device according to claim 5, characterized in that: The alarm module comprises an audible and visual alarm.

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