Hydraulic lifting device and its fault detection system

Abstract

The utility model discloses a kind of hydraulic lifting device and its fault detection system, wherein, the fault detection system of hydraulic lifting device includes: position detection unit, it is suitable for the position detection of the lifting platform of hydraulic lifting device, to obtain position signal;Pressure detection unit, it is suitable for the detection of the hydraulic pressure of hydraulic lifting device, to obtain pressure signal;Control unit, control unit is connected with position detection unit and pressure detection unit respectively, control unit is configured as in the case where according to position signal determines that lifting platform is in stationary state, according to the pressure range of previously established pressure database and position signal determination, and in the case where pressure signal does not satisfy pressure range, determine that hydraulic lifting device fails.The fault detection system has realized accurate jammed fault identification, to avoid the situation that single signal leads to misjudgment occurs, and then improve the security of hydraulic lifting device.

Description

Technical Field

[0001] This application relates to the field of industrial technology, and in particular to a hydraulic lifting device and its fault detection system. Background Technology

[0002] Fixed hydraulic lifting platforms are commonly used vertical transportation equipment in the industrial field, widely applied in warehousing and logistics, workshop assembly, and other scenarios. Their core functionality relies on a hydraulic system to drive the platform's lifting and lowering. The safety during the descent process directly affects the equipment's operational reliability and the safety of personnel during operation and maintenance. Currently, fault monitoring technologies for hydraulic lifting platforms typically use a single sensor, which cannot accurately identify jamming faults, posing a safety hazard. Utility Model Content

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the first objective of this invention is to provide a fault detection system for a hydraulic lifting device. This system determines the state of the lifting platform through position signals and combines this with pressure signals to determine whether the hydraulic lifting device has experienced a jamming fault. This achieves accurate jamming fault identification, thereby avoiding misjudgments caused by a single signal and improving the safety of the hydraulic lifting device.

[0004] The second objective of this utility model is to provide a hydraulic lifting device.

[0005] To achieve the above objectives, a fault detection system for a hydraulic lifting device is proposed according to a first aspect embodiment of the present invention, comprising: a position detection unit adapted to detect the position of the lifting platform of the hydraulic lifting device to obtain a position signal; a pressure detection unit adapted to detect the hydraulic pressure of the hydraulic lifting device to obtain a pressure signal; and a control unit connected to the position detection unit and the pressure detection unit respectively, the control unit being configured to determine a pressure range based on a pre-established pressure database and the position signal when the lifting platform is determined to be stationary according to the position signal, and to determine that the hydraulic lifting device has malfunctioned when the pressure signal does not meet the pressure range.

[0006] The fault detection system according to an embodiment of this utility model includes a position detection unit, a pressure detection unit, and a control unit. The position detection unit is adapted to detect the position of the lifting platform of the hydraulic lifting device to obtain a position signal. The pressure detection unit is adapted to detect the hydraulic pressure of the hydraulic lifting device to obtain a pressure signal. The control unit is connected to both the position detection unit and the pressure detection unit. The control unit is configured to determine a pressure range based on a pre-established pressure database and the position signal when the lifting platform is determined to be stationary according to the position signal, and to determine that the hydraulic lifting device has malfunctioned if the pressure signal does not meet the pressure range. Thus, by determining the state of the lifting platform through the position signal and combining it with the pressure signal to determine whether the hydraulic lifting device has jammed, accurate jamming fault identification is achieved, thereby avoiding misjudgment due to a single signal and improving the safety of the hydraulic lifting device.

[0007] According to one embodiment of the present invention, the fault detection system further includes an alarm unit connected to the control unit. The alarm unit is configured to issue an alarm message upon receiving a control signal from the control unit. The control unit sends a control signal to the alarm unit when it determines that a fault has occurred in the hydraulic lifting device.

[0008] According to one embodiment of the present invention, the alarm unit includes at least one audio device and a light-emitting device.

[0009] According to one embodiment of the present invention, the position detection unit includes a position sensor, which is installed on one side of the guide rail of the lifting platform.

[0010] According to one embodiment of the present invention, the position sensor is a laser rangefinder sensor.

[0011] According to one embodiment of the present invention, the pressure detection unit includes a pressure sensor, which is installed in the oil inlet pipe of the hydraulic cylinder of the hydraulic lifting device.

[0012] According to one embodiment of the present invention, the pressure sensor is a pressure transmitter.

[0013] According to one embodiment of the present invention, the pressure database includes multiple position intervals and a pressure range corresponding to each position interval, wherein the difference between the upper limit value and the lower limit value of each position interval is a preset difference value.

[0014] According to one embodiment of the present invention, the control unit is a PLC.

[0015] To achieve the above objectives, a hydraulic lifting device is provided according to a second aspect of the present invention, including a fault detection system for the hydraulic lifting device of any of the foregoing embodiments.

[0016] According to the embodiment of the present invention, the hydraulic lifting device uses the above-mentioned fault detection system to determine the state of the lifting platform through the position signal and to determine whether the hydraulic lifting device has a jamming fault by combining the pressure signal. This achieves accurate jamming fault identification, thereby avoiding misjudgment caused by a single signal and improving the safety of the hydraulic lifting device.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of a fault detection system for a hydraulic lifting device according to an embodiment of the present invention;

[0019] Figure 2 This is a structural schematic diagram of a fault detection system for a hydraulic lifting device according to another embodiment of the present invention;

[0020] Figure 3 This is a flowchart illustrating a fault detection method according to an embodiment of the present invention. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0022] It should be noted that this application is based on the inventor's understanding and research into the following issues:

[0023] Fault detection technologies in related fields use a single sensor for detection. For example, a position sensor may be used to independently monitor the status of the lifting platform, or a pressure sensor may be used to monitor the pressure status of the hydraulic system and alarm based on abnormal position or pressure. However, a single signal is susceptible to environmental interference and has a high risk of false alarms and missed alarms.

[0024] When only a position sensor is used, the fault detection logic in the relevant technology triggers a fault alarm based on the condition of "position unchanged" without taking into account the pressure status of the hydraulic system. Therefore, it can identify a stationary fault in the lifting platform. However, when the lifting platform jams and the hydraulic cylinder is depressurized, the fault monitoring system cannot distinguish between "normal shutdown" and "jamming fault", resulting in braking delay or malfunction.

[0025] When using only pressure sensors, the fault detection logic in related technologies involves setting a preset pressure threshold and triggering an alarm when the pressure exceeds that threshold, thus enabling the monitoring of hydraulic system overload. However, this method cannot adapt to the pressure fluctuation characteristics at different descent positions of the platform, resulting in insufficient fault location accuracy.

[0026] Therefore, the relevant technologies lack a joint analysis mechanism for "platform stationary position" and "abnormal pressure relief of hydraulic system". In particular, they cannot accurately identify jamming faults after cylinder pressure relief, resulting in delayed alarms and potential safety hazards.

[0027] Based on this, the present invention provides a hydraulic lifting device and its fault detection system. By using the above-mentioned fault detection system, the state of the lifting platform is determined by the position signal, and the hydraulic lifting device is judged to be stuck by the pressure signal. This achieves accurate identification of stuck faults, thereby avoiding misjudgment caused by a single signal and improving the safety of the hydraulic lifting device.

[0028] The following describes the hydraulic lifting device and its fault detection system according to embodiments of the present invention with reference to the accompanying drawings.

[0029] Figure 1 This is a structural schematic diagram of a fault detection system for a hydraulic lifting device according to an embodiment of the present invention. Figure 1 As shown, the fault detection system 100 of the hydraulic lifting device includes: a position detection unit 10, a pressure detection unit 20, and a control unit 30.

[0030] The position detection unit 10 is adapted to detect the position of the lifting platform 201 of the hydraulic lifting device 1000 to obtain a position signal; the pressure detection unit 20 is adapted to detect the hydraulic pressure of the hydraulic lifting device 1000 to obtain a pressure signal; the control unit 30 is connected to the position detection unit 10 and the pressure detection unit 20 respectively, and the control unit 30 is configured to determine the pressure range based on a pre-established pressure database and the position signal when the lifting platform 201 is determined to be in a stationary state according to the position signal, and to determine that the hydraulic lifting device 1000 has malfunctioned when the pressure signal does not meet the pressure range.

[0031] Specifically, such as Figure 1As shown, the hydraulic lifting device 1000 includes a lifting platform 201, a hydraulic cylinder 202, an oil pump 203, and an oil tank 204. The position detection unit 10 collects the vertical displacement data of the lifting platform 201 in real time and continuously outputs a position signal. The pressure detection unit 20 collects the hydraulic pressure of the hydraulic cylinder 202 to obtain a pressure signal. The control unit 30 is connected to both the position detection unit 10 and the pressure detection unit 20 to receive the position signal sent by the position detection unit 10 and the pressure signal sent by the pressure detection unit 20. If the position signal changes within a preset time, the control unit 30 can determine that the lifting platform 201 is operating normally, and the control unit 30 continues to monitor the operating status of the lifting platform 201. If the position signal remains unchanged after the preset time, the control unit 30 determines that the lifting platform 201 is stationary. The control unit 30 needs to determine whether the lifting platform 201 has jammed. However, the position signal alone cannot distinguish between a normal shutdown and a jammed fault; therefore, the pressure signal is also needed for this determination. If the lifting platform 201 stops normally, the pressure signal should be stable within the pressure range. It should be noted that the pressure range is different when the lifting platform 201 is in different positions. Therefore, it is necessary to look up the corresponding pressure range from the pressure database based on the position signal. If the lifting platform 201 jams, the hydraulic lifting device 1000 will depressurize, and the pressure signal will exceed the pressure range. Therefore, the control unit 30 can determine whether the hydraulic lifting device 1000 has jammed based on the pressure signal and pressure range.

[0032] In some embodiments, the pressure database includes multiple location intervals and a pressure range corresponding to each location interval, wherein the difference between the upper limit value and the lower limit value of each location interval is a preset difference value.

[0033] Specifically, the pressure database is obtained by conducting multiple descent tests on the hydraulic lifting device 1000 under different load conditions, and then stored in the control unit 30. The pressure database includes the pressure range corresponding to different positions. For example, assuming a preset difference of 5cm, pressure data is collected at various positions (points are taken at 5cm intervals), and outliers are removed using the 3σ rule to obtain the upper pressure limit and pressure drop value corresponding to each position interval, thus obtaining multiple position intervals and the pressure range corresponding to each position interval.

[0034] For example, in some embodiments, the control unit 30 is a PLC (Programmable Logic Controller). It should be noted that the control unit 30 is not limited to a PLC, and can also be other control chips.

[0035] In one alternative embodiment, the control unit 30 is also adapted to connect to the oil pump 203 to control the oil pump 203, thereby controlling the lifting platform 201.

[0036] In the above embodiments, by dual monitoring of position and pressure signals and comparison with a pre-established pressure database, no manual judgment is required. Furthermore, compared to related technologies that rely on pressure thresholds, this application eliminates the need to wait for the pressure signal to exceed the threshold, achieving rapid and accurate identification of jamming faults. This avoids misjudgments caused by a single signal, thereby improving the safety of the hydraulic lifting device. Moreover, the fault monitoring system in this embodiment adopts a modular design, thus adaptable to various models of hydraulic lifting devices without requiring significant modifications to existing equipment.

[0037] In some embodiments, such as Figure 2 As shown, the fault detection system 100 also includes an alarm unit 40, which is connected to the control unit 30. The alarm unit 40 is configured to issue an alarm message upon receiving a control signal from the control unit 30. The control unit 30 sends a control signal to the alarm unit 40 when it determines that the hydraulic lifting device 1000 has malfunctioned.

[0038] Specifically, the fault detection system 100 also includes an alarm unit 40. After the control unit 30 determines that the hydraulic lifting device 1000 has a jamming fault, it will generate a control signal and send the control signal to the alarm unit 40 to control the alarm unit 40 to issue an alarm message, so as to promptly remind the user that the hydraulic lifting device 1000 has a jamming fault.

[0039] In some embodiments, the alarm unit 40 includes at least one of an audio device (not shown) and a light-emitting device (not shown).

[0040] It is understood that when the alarm unit 40 includes an audio device, such as a buzzer or horn, the alarm message can be sound; when the alarm unit 40 includes a light-emitting device, such as a light-emitting diode, the alarm message can be light; when the alarm unit 40 includes both an audio device and a light-emitting device, the alarm message can be both sound and light.

[0041] In the above embodiment, after the control unit determines that the hydraulic lifting device has jammed, it will also control the alarm unit to issue an alarm message in a timely manner, thereby realizing real-time alarm when the hydraulic lifting device jams during the descent process, which further improves the safety of the hydraulic lifting device.

[0042] In some embodiments, the position detection unit 10 includes a position sensor (not shown), which is mounted on one side of the guide rail of the lifting platform 201.

[0043] Specifically, the position sensor is installed on one side of the guide rail of the lifting platform 201, which can directly measure the movement of the lifting platform 201 relative to the fixed guide rail, so as to provide a stable and accurate position signal.

[0044] For example, in some embodiments, the position sensor is a laser rangefinder.

[0045] The laser rangefinder emits a laser beam onto the lifting platform 201 and receives the reflected light signal. It calculates the round-trip time (or phase difference) of the light wave, accurately calculates the real-time distance between the sensor and the lifting platform 201, and determines the installation position of the laser rangefinder, thereby calculating the position signal of the lifting platform 201.

[0046] In some embodiments, the pressure detection unit 20 includes a pressure sensor (not shown), which is installed in the oil inlet line of the hydraulic cylinder 202 of the hydraulic lifting device 1000.

[0047] It is understandable that installing the pressure sensor in the oil inlet line of the hydraulic cylinder 202, where the oil inlet pressure is related to the cylinder thrust, can avoid interference from return oil back pressure / valve pressure drop and enable real-time monitoring of key pressures in the hydraulic system.

[0048] For example, in some embodiments, the pressure sensor is a pressure transmitter.

[0049] Among them, the pressure transmitter is a high-precision pressure transmitter.

[0050] It should be noted that position sensors are not limited to laser rangefinders, and pressure sensors are not limited to pressure transmitters. Different types of position and pressure sensors can be selected according to the actual situation, and no specific restrictions are made here.

[0051] In the above embodiments, the position and pressure signals of the hydraulic lifting device are accurately acquired by using a laser rangefinder and a pressure transmitter, ensuring the accuracy of the acquisition of position and pressure signals, thereby further improving the accuracy of jamming fault identification.

[0052] The technical solution of this application is further described in detail below with reference to specific implementation methods:

[0053] like Figure 3 As shown, the fault detection method executed by the control unit includes the following steps:

[0054] S101 receives position signals from the position detection unit and pressure signals from the pressure detection unit during the operation of the lifting platform.

[0055] S102, determine whether the lifting platform is stationary based on the position signal. If not, proceed to step S103; if yes, proceed to step S104.

[0056] S103 continues to monitor the operating status of the lifting platform based on the position signal.

[0057] S104 determines the pressure range based on the position signal and pressure database.

[0058] S105, determine whether the pressure signal meets the pressure range. If yes, proceed to step S106; otherwise, proceed to step S107.

[0059] S106, confirm that the lifting platform has stopped normally.

[0060] S107 indicates that the lifting platform has malfunctioned and is stuck.

[0061] S108, the control alarm unit sends an alarm message.

[0062] In the above embodiment, the control unit performs dual monitoring of position and pressure signals and compares them with a pre-established pressure database to automatically identify jamming faults. Furthermore, compared with fault detection technologies in related technologies, this embodiment uses a combination of two signals to perform fast and accurate jamming fault identification, thereby avoiding misjudgment caused by a single signal and improving the safety of the hydraulic lifting device.

[0063] In summary, the fault detection system according to this embodiment of the present invention, through dual monitoring of position and pressure signals and comparison with a pre-established pressure database, eliminates the need for manual judgment. Furthermore, compared to related technologies that rely on pressure thresholds, this application does not require waiting for the pressure signal to exceed the threshold, achieving rapid and accurate identification of jamming faults. This avoids misjudgments caused by a single signal, thereby improving the safety of the hydraulic lifting device. Moreover, the fault monitoring system of this embodiment adopts a modular design, thus adaptable to various models of hydraulic lifting devices without significant modifications to existing equipment. In addition, after determining that a jamming fault has occurred in the hydraulic lifting device, the control unit will also control the alarm unit to promptly issue an alarm message, achieving real-time alarm for jamming faults occurring during the descent of the hydraulic lifting device, thereby further enhancing the safety of the hydraulic lifting device.

[0064] Corresponding to the above embodiments, this utility model also proposes a hydraulic lifting device. For example... Figure 1 As shown, the hydraulic lifting device 1000 includes a fault detection system 100 for the hydraulic lifting device of any of the foregoing embodiments.

[0065] According to the embodiment of the present invention, the hydraulic lifting device uses the above-mentioned fault detection system to determine the state of the lifting platform through the position signal and to determine whether the hydraulic lifting device has a jamming fault by combining the pressure signal. This achieves accurate jamming fault identification, thereby avoiding misjudgment caused by a single signal and improving the safety of the hydraulic lifting device.

[0066] It should be understood that the various parts of this utility model can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0067] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0068] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0069] Furthermore, the terms "first," "second," etc., used in the embodiments of this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance, or implicitly specifying the number of technical features indicated in this embodiment. Therefore, features defined with terms such as "first" and "second" in the embodiments of this utility model can explicitly or implicitly indicate that the embodiment includes at least one of those features. In the description of this utility model, the word "multiple" means at least two or more, such as two, three, four, etc., unless otherwise explicitly specified in the embodiments.

[0070] In this utility model, unless otherwise explicitly specified or limited in the embodiments, the terms "installation," "connection," "joining," and "fixing" appearing in the embodiments should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can also be a mechanical connection, an electrical connection, etc. Of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two components, or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific implementation.

[0071] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0072] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A fault detection system for a hydraulic lift, the system comprising: include: A position detection unit is adapted to detect the position of the lifting platform of the hydraulic lifting device in order to obtain a position signal; The pressure detection unit is adapted to detect the hydraulic pressure of the hydraulic lifting device in order to obtain a pressure signal; The control unit is connected to the position detection unit and the pressure detection unit respectively. The control unit is configured to determine a pressure range based on a pre-established pressure database and the position signal when the lifting platform is determined to be stationary according to the position signal, and to determine that the hydraulic lifting device has malfunctioned when the pressure signal does not meet the pressure range.

2. The fault detection system according to claim 1, characterized in that, Also includes: An alarm unit is connected to the control unit and is configured to issue an alarm message upon receiving a control signal from the control unit. The control unit sends the control signal to the alarm unit when it determines that the hydraulic lifting device has malfunctioned.

3. The fault detection system according to claim 2, characterized in that, The alarm unit includes at least one audio device and a light-emitting device.

4. The fault detection system according to claim 1, characterized in that, The position detection unit includes a position sensor, which is installed on one side of the guide rail of the lifting platform.

5. The fault detection system according to claim 4, characterized in that, The position sensor is a laser rangefinder.

6. The fault detection system according to claim 1, characterized in that, The pressure detection unit includes a pressure sensor, which is installed in the oil inlet pipe of the hydraulic cylinder of the hydraulic lifting device.

7. The fault detection system according to claim 6, characterized in that, The pressure sensor is a pressure transmitter.

8. The fault detection system according to any one of claims 1-7, characterized in that, The pressure database includes multiple location intervals and a pressure range corresponding to each location interval, wherein the difference between the upper limit value and the lower limit value of each location interval is a preset difference value.

9. The fault detection system according to any one of claims 1-7, characterized in that, The control unit is a PLC.

10. A hydraulic lifting device, characterized in that, The fault detection system for the hydraulic lifting device according to any one of claims 1-9 is included.

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