Lifting monitoring system and method for electric lifting table

Abstract

The invention discloses a lifting monitoring system and method for an electric lifting table. The lifting monitoring system comprises a bearing monitoring device, a gyroscope monitoring device and a grating monitoring device. The load-bearing monitoring device is used for monitoring the load bearing of the table top of the electric lifting table, the gyroscope monitoring device is used for monitoring the lifting acceleration of lifting of the table top, and the grating monitoring device is used for monitoring the change value of the sleeving depth in an I-shaped supporting assembly of the electric lifting table to obtain the relative movement speed. In the lifting control process of the electric lifting table by a lifting driving device of the electric lifting table, the driving current of a motor used for providing lifting power is set according to the bearing weight, so that the table top is lifted at a preset first lifting speed; and the first lifting speed is verified through the lifting acceleration and the relative movement speed in the lifting process. As different motor driving currents are set according to different loads to ensure that the lifting speed of the table top is constant, the safety and reliability of the electric lifting table are greatly improved, and then the user experience is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent furniture, and in particular to a lifting monitoring system and method for an electric lifting table. Background Art

[0002] Electric lift tables are generally used as smart office furniture, but with the demand for working from home, they have been widely used at home, such as home computer desks or study desks. Electric lift tables are driven by electricity, and can easily adjust the height of the desktop automatically to meet the personalized needs of different users. The lifting monitoring system of the electric lift table is the core part of the electric lift table. It uses electric drive motors to achieve automatic adjustment and lifting of the table height through mechanical devices and electronic components. The lifting monitoring system of a general electric lift table has functions such as height adjustment, anti-collision sensing, sedentary reminder, and wireless or voice remote control. However, the most important function of the lifting monitoring system is to ensure that the entire lifting process of the electric lift table is uniform and stable, avoiding shaking or instability caused by too fast speed changes, thereby protecting items on the desktop from slipping or tipping over, and ensuring the safety of users. In addition, uniform lifting can also reduce the noise generated during the lifting process to avoid interference to users. At the same time, the smooth lifting process can also make users feel more comfortable, thereby improving user experience. Summary of the invention

[0003] The main technical problem solved by the present invention is to improve the stability of the electric lifting table during the uniform speed lifting process.

[0004] According to the first aspect, an embodiment provides a lifting monitoring system for an electric lifting table, the electric lifting table comprising a desktop, an I-shaped support assembly and a lifting drive device; The I-shaped support assembly includes a lifting and regulating component and a fixed support component, wherein the lifting and regulating component is connected to the fixed support component in a sleeve manner; the lifting and regulating component is fixedly connected to the desktop, and the fixed support component is used to horizontally support the desktop through the lifting and regulating component; The lifting drive device is arranged on the I-shaped support assembly, and the lifting drive device is used to adjust the sleeve depth of the lifting regulating component and the fixed support component by driving the motor to rotate, so as to control the lifting height of the electric lifting table; The lifting monitoring system includes a load-bearing monitoring device, a gyroscope monitoring device and a grating monitoring device; The load-bearing monitoring device is used to monitor the load-bearing weight of the desktop in real time, and convert the load-bearing weight into a load-bearing electrical signal and send it to the lifting drive device; when the electric lifting table lifts the desktop, the lifting drive device sets the driving current of the motor according to the value of the load-bearing electrical signal, so that the desktop is lifted and lowered at a preset first lifting speed; The gyroscope monitoring device is used to monitor the lifting acceleration of the desktop in real time, and send the lifting acceleration to the lifting drive device; the lifting drive device is used to verify the first lifting speed according to the lifting acceleration; The grating monitoring device is used to monitor the sleeve depth values ​​of the lifting and regulating member and the fixed support member in real time, so as to obtain the relative moving speed of the lifting and regulating member and the fixed support member according to the change of the sleeve depth value, and send the relative moving speed to the lifting drive device; the lifting drive device is used to verify the first lifting speed according to the relative moving speed; The lifting drive device is also used to stop the lifting operation of the electric lifting table when the difference between the relative moving speed and the first lifting speed is greater than a preset upper limit value during the lifting control of the electric lifting table.

[0005] In one embodiment, the lifting drive device sets the driving current of the motor according to the value of the load-bearing electrical signal to ensure that the desktop is lifted and lowered at a preset first lifting speed, including: When different load-bearing weights of the desktop are obtained by testing, the motor maintains the desktop lifting speed at the driving current value of the first lifting speed to obtain a corresponding curve between the load-bearing weight and the driving current; When the electric lifting table is raised or lowered, the driving current of the motor is set according to the current load-bearing weight of the table top and the corresponding curve between the load-bearing weight and the driving current.

[0006] In one embodiment, the load-bearing monitoring device includes a first load-bearing sensor; the first load-bearing sensor is arranged on the connecting piece between the desktop and the lifting and regulating component, and one first load-bearing sensor is arranged on each connecting piece; the first load-bearing sensor is used to sense the load-bearing weight of the desktop.

[0007] In one embodiment, the load-bearing monitoring device includes a second load-bearing sensor; the second load-bearing sensor is arranged on the floor-contacting table foot of the fixed support member, and one second load-bearing sensor is arranged on each floor-contacting table foot; The lifting drive device is also used for determining that the lifting of the electric lifting table is obstructed, and stopping the lifting or making the tabletop rebound when encountering an obstruction if the load-bearing weight sensed by at least one of the first load-bearing sensors and at least one of the second load-bearing sensors increases and the load-bearing weights sensed by the other first load-bearing sensors and the second load-bearing sensors decrease during the lifting and lowering control of the electric lifting table; The lifting drive device is also used to determine that the lifting of the electric lifting table is obstructed, and stop the lifting or make the tabletop rebound when encountering resistance if the load-bearing weight sensed by at least one of the first load-bearing sensors and at least one of the second load-bearing sensors decreases and the load-bearing weights sensed by other first load-bearing sensors and second load-bearing sensors increase during the lifting control of the electric lifting table.

[0008] In one embodiment, the grating monitoring device includes a grating infrared counter-radiation sensor, and the grating infrared counter-radiation sensor includes an infrared emitter and a photoreceiver; the infrared emitter and the photoreceiver are respectively fixedly arranged on the lifting and regulating component and the fixed supporting component to obtain the relative moving speed according to the changing speed of the light receiving position of the photoreceiver.

[0009] In one embodiment, the grating monitoring device is further used to obtain the tabletop height of the electric lifting table according to the light receiving position of the light receiver.

[0010] In one embodiment, the infrared emitter and the light receiver are arranged in a cavity of a sleeve assembly used for sleeve connection of the lifting and regulating member and the fixed supporting member.

[0011] In one embodiment, the gyroscope monitoring device includes an electronic gyroscope, which is fixedly connected to the desktop; the electronic gyroscope is used to monitor the lifting acceleration of the electric lifting table during the lifting process.

[0012] In one embodiment, the electronic gyroscope is also used to monitor the changes in the lifting acceleration of the electric lifting table during the lifting process, so as to determine the reset position of the desktop when the desktop is reset and calibrated, and to confirm the braking of the desktop during the lifting process.

[0013] According to the second aspect, an embodiment provides a lifting monitoring method for an electric lifting table, which is applied to the lifting monitoring system as described above, and the lifting monitoring method includes: Monitoring the tabletop load-bearing weight of the electric lift table; When the electric lifting table is controlled to be lifted and lowered at a preset first lifting speed, the driving current of the motor driving the lifting movement of the table top is set according to the load-bearing weight of the table top.

[0014] According to the lifting monitoring system of the above embodiment, different motor driving currents are set according to the different load-bearing weights of the desktop of the electric lifting table to ensure the constant lifting speed of the desktop, thereby greatly improving the safety and reliability of the electric lifting table and thus improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of an electric lifting table in an embodiment; Figure 2 It is a structural schematic diagram of an electric lifting table in another embodiment; Figure 3 It is a structural block diagram of a lifting monitoring system in an embodiment; Figure 4 A side view of an electric lift table in one embodiment; Figure 5 is a mechanism block diagram of a load-bearing monitoring device in an embodiment; Figure 6 is a structural block diagram of a grating monitoring device in an embodiment; Figure 7 A schematic diagram of the principle of a grating infrared beam sensor in one embodiment; Figure 8 It is a cross-sectional schematic diagram of a sleeve assembly of an I-beam support component in an embodiment. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are for making the present application better understood. However, those skilled in the art can easily recognize that some features can be omitted in different situations, or can be replaced by other elements, materials, methods. In some cases, some operations related to the present application are not shown or described in the specification, this is to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations according to the description in the specification and the general technical knowledge in the art.

[0017] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0018] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0019] In the prior art, the uniform lifting and lowering of the electric lifting table is ensured by controlling the constant driving current of the motor, and the lifting speed of the desktop is read out by the Hall sensor set on the motor. The position detection and speed detection of the lifting table column are usually detected by the Hall element on the motor shaft to judge the motion state. In the actual use of the electric lifting table, the desktop is to be placed with items (for example, computers, books, lamps and / or household appliances, etc.), so the load-bearing capacity of the entire desktop is uncertain and unbalanced. Therefore, setting a unique driving current for lifting and lowering control cannot ensure that the lifting speed and lowering speed of the desktop are always consistent when there is a heavy load. It should be pointed out that ensuring the uniform lifting and lowering of the desktop can reduce the load and wear of the motor and extend the service life of the motor, thereby ensuring the stability and durability of the electric lifting table.

[0020] There are potential safety hazards in the lifting and lowering process of an electric lift table (for example, collision and jamming, etc.), so it is necessary to set up lifting protection mechanisms such as emergency stop, rollback and / or initialization recovery in a targeted manner. At present, the judgment of collision and jamming of an electric lift table is based on the change of the driving current of the driving motor. However, when the desktop of the electric lift table bears a large load, it will also cause the driving current to be too large (the greater the load, the greater the lifting power required, and the greater the driving current required of the driving motor), which will cause the electric lift table to misjudge the lifting speed during the lifting of the desktop, and then cause a fault prompt of the lift table. Obviously, there are potential safety hazards in monitoring the uniform speed of the desktop lifting based only on the driving current of the driving motor. How to expand multiple ways to monitor the lifting speed of the desktop is a major research and development direction of this application.

[0021] In an embodiment of the present application, a load-bearing monitoring device is provided on the electric lifting table, which is used to monitor the load-bearing weight of the desktop and set the driving current of the motor that drives the desktop to rise and fall according to the load-bearing weight, so that the electric lifting table is lifted and lowered at a preset first lifting speed to keep the lifting speed of the electric lifting table constant, thereby reducing and lowering operational errors caused by users misjudgment of the lifting speed.

[0022] Embodiment 1: Please refer to Figure 1, is a schematic diagram of the structure of an electric lift table in an embodiment, the electric lift table includes a desktop 1, an I-shaped support assembly 2 and a lift drive device 3. The I-shaped support assembly includes a lift control component and a fixed support component, and the lift control component and the fixed support component are connected in a sleeve manner. The lift control component is fixedly connected to the desktop, and the fixed support component is used to horizontally support the desktop through the lift control component.

[0023] Please refer to Figure 2 , is a structural schematic diagram of an electric lift table in another embodiment. In one embodiment, a lifting drive device is arranged on an I-shaped support assembly. The lifting drive device is used to adjust the sleeve depth of the lifting control component 21 and the fixed support component 22 by rotating a driving motor to control the lifting height of the desktop 1 of the electric lift table.

[0024] Please refer to Figure 3 , is a structural block diagram of a lifting monitoring system in an embodiment, and the lifting monitoring system 5 includes a load-bearing monitoring device 51, a gyroscope monitoring device 52 and a grating monitoring device 53. The load-bearing monitoring device is used to monitor the load-bearing weight of the desktop in real time, and convert the load-bearing weight into a load-bearing electrical signal and send it to the lifting drive device 3. When the electric lifting table lifts the desktop, the lifting drive device 3 sets the driving current of the motor 4 according to the value of the load-bearing electrical signal, so that the desktop can be lifted and lowered at a preset first lifting speed. The gyroscope monitoring device 52 is used to monitor the lifting acceleration of the desktop in real time, and send the lifting acceleration to the lifting drive device 3. The lifting drive device 3 is used to verify the first lifting speed based on the lifting acceleration. In one embodiment, when the value of the lifting acceleration is zero, the desktop is in a stationary state or a uniform lifting state, and when the value of the lifting acceleration is not zero, the desktop will enter a braking state or a non-uniform lifting state. The grating monitoring device 53 is used to monitor the sleeve depth value of the lifting and regulating member 21 and the fixed support member 22 in real time, so as to obtain the relative moving speed of the lifting and regulating member 21 and the fixed support member 22 according to the change of the sleeve depth value, and send the relative moving speed to the lifting drive device 3. The lifting drive device 3 is used to verify the first lifting speed according to the relative moving speed. The lifting drive device 3 is also used to stop the lifting operation of the electric lifting table when the difference between the relative moving speed and the first lifting speed is greater than a preset upper limit value during the lifting control process of the electric lifting table.

[0025] In one embodiment, the method for setting the driving current of the motor according to the value of the load-bearing electrical signal is to obtain the driving current value of the motor when the desktop has different load-bearing weights through testing, so as to maintain the desktop lifting speed at a first lifting speed, so as to obtain the corresponding curve between the load-bearing weight and the driving current, and then when the electric lifting table is raised or lowered, the driving current of the motor is set according to the current load-bearing weight of the desktop and the corresponding curve between the load-bearing weight and the driving current.

[0026] Please refer to Figure 4, is a side schematic diagram of an electric lifting table in one embodiment. In one embodiment, the load-bearing monitoring device includes a first load-bearing sensor 23, which is arranged on the connecting piece between the desktop and the lifting and regulating member 21, and a first load-bearing sensor 23 is arranged on each connecting piece. The first load-bearing sensor 23 is used to sense the load-bearing weight of the desktop. In one embodiment, the load-bearing monitoring device includes a second load-bearing sensor 24, which is arranged on the ground-contacting table legs of the fixed support member 22, and a second load-bearing sensor 24 is arranged on each ground-contacting table leg. The second load-bearing sensor 21 is used to measure the pressure of each table corner of the electric lifting table on the ground on the one hand, and on the other hand, it is used to monitor whether the I-shaped support assembly has abnormal deformation through the different pressures of each table corner.

[0027] In one embodiment, the lifting drive device is also used to determine that the lifting of the electric lifting table is blocked, and the lifting is stopped or the desktop rebounds when encountering resistance, if the load-bearing weight sensed by at least one first load-bearing sensor and at least one second load-bearing sensor increases, and the load-bearing weight sensed by other first load-bearing sensors and second load-bearing sensors decreases during the lifting and lowering control of the electric lifting table. Or, the lifting drive device is also used to determine that the lifting of the electric lifting table is blocked, and the lifting is stopped or the desktop rebounds when encountering resistance, if the load-bearing weight sensed by at least one first load-bearing sensor and at least one second load-bearing sensor decreases, and the load-bearing weight sensed by other first load-bearing sensors and second load-bearing sensors increases during the lifting and lowering control of the electric lifting table. When the pressure on one side of the electric lifting table suddenly increases or decreases, and the pressure on the other side is reversed, it can be basically determined that an obstacle is encountered during the lifting process, so as to perform a protective stop or rebound operation.

[0028] In one embodiment, the grating monitoring device includes a grating infrared counter-radiation sensor, and the grating infrared counter-radiation sensor includes an infrared emitter and a light receiver. The infrared emitter and the light receiver are respectively fixedly arranged on the lifting and regulating member and the fixed support member to obtain the relative moving speed according to the speed of change of the light receiving position of the light receiver. In one embodiment, the grating monitoring device is also used to obtain the tabletop height of the electric lifting table according to the light receiving position of the light receiver. In one embodiment, the infrared emitter and the light receiver are arranged in the cavity of the sleeve assembly used for sleeve connection of the lifting and regulating member and the fixed support member.

[0029] In one embodiment, the gyroscope monitoring device includes an electronic gyroscope, which is fixedly connected to the desktop, and the electronic gyroscope is used to monitor the lifting acceleration of the electric lifting table during the lifting process. In one embodiment, the electronic gyroscope is also used to monitor the change of the lifting acceleration of the desktop of the electric lifting table during the lifting process, so as to determine the confirmation of the desktop reaching the reset position when the desktop is reset and calibrated, and to confirm the braking and stopping of the desktop during the lifting process. In one embodiment, if the value of the lifting acceleration changes from zero to other values ​​and then returns to zero, it can be determined that the desktop has completed the braking and stopping process. Compared with the traditional current circuit detection circuit, the electronic gyroscope realizes the lifting table reset function by using an accelerometer gyroscope and associated circuits. When the column of the lifting table needs to be reset and then initialize the position of the whole machine, the column will collide with the mechanical position to generate load and acceleration changes, and the corresponding signal processing circuit will further judge to confirm that the lifting drive device has stopped and reset. Traditionally, current detection circuits are usually used for judgment methods, which require the addition of load change detection and sampling signal processing processes, and have problems such as low precision, high latency, and a single detection amount. When the electronic gyroscope is applied to the reset function of the electric lift table, the speed and acceleration parameters that are more accurately measured to determine the reset conditions can be used. Through the sampling and signal processing circuits with fast response speed and high precision, it can more accurately identify whether the desktop is completely reset, making the electric lift table more accurate, rapid, and safe during the reset process.

[0030] In one embodiment of the present application, a lifting monitoring method is also disclosed, which is used for application in the lifting monitoring system as mentioned above. The lifting monitoring method monitors the load-bearing weight of the desktop of the electric lifting table, and when the electric lifting table is lifted and lowered at a preset first lifting speed, the driving current of the motor that drives the desktop to lift and lower is set according to the desktop load-bearing weight.

[0031] In one embodiment, the lifting monitoring method further includes a first lifting speed setting function, specifically including: In response to the preset speed value input by the user as the first lifting speed, and when re-obtaining different load-bearing weights of the desktop through testing, the motor maintains the desktop lifting speed at the driving current value of the first lifting speed to obtain the corresponding curve of the load-bearing weight and the driving current. In one embodiment, the lifting speed during the lifting process is verified by a grating monitoring device during the test.

[0032] The lifting monitoring system disclosed in the embodiments of the present application includes a load-bearing monitoring device, a gyroscope monitoring device and a grating monitoring device. The load-bearing monitoring device is used to monitor the load-bearing of the desktop of the electric lifting table, the gyroscope monitoring device is used to monitor the lifting acceleration of the desktop, and the grating monitoring device is used to monitor the change in the sleeve depth in the I-beam support assembly of the electric lifting table to obtain the relative moving speed. In the process of lifting and lowering the electric lifting table, the lifting drive device of the electric lifting table sets the driving current of the motor used to provide lifting power according to the load-bearing weight, so that the desktop is lifted and lowered at a preset first lifting speed, and the first lifting speed is verified by the lifting acceleration and the relative moving speed during the lifting process. Since different motor driving currents are set according to different loads to ensure the constancy of the desktop lifting speed, the safety and reliability of the electric lifting table are greatly improved, thereby improving the user experience.

[0033] Embodiment 2: In one embodiment of the present application, a load-bearing monitoring device for an electric lift table is also disclosed, wherein the electric lift table includes a desktop, an I-shaped support assembly, a lifting drive device and a hand-controlled terminal. The I-shaped support assembly includes a lifting and regulating component and a fixed support component, the lifting and regulating component is connected to the fixed support component in a sleeve manner, the lifting and regulating component is fixedly connected to the desktop, and the fixed support component is used to horizontally support the desktop through the lifting and regulating component. The lifting drive device is arranged on the I-shaped support assembly, and the lifting and regulating component is used to adjust the sleeve depth of the lifting and regulating component and the fixed support component by driving the motor to rotate, so as to control the lifting height of the electric lift table. The hand-controlled terminal is electrically connected to the lifting drive device, and a key switch is arranged on the hand-controlled terminal, and a lifting and lowering electrical signal is output to the lifting and lowering drive device by turning on or off the key switch, so that the lifting and lowering drive device can lift and lower the desktop in response to the lifting and lowering electrical signal.

[0034] Please refer to Figure 5 , a block diagram of the mechanism of a load-bearing monitoring device in an embodiment, the load-bearing monitoring device 51 includes a first load-bearing sensor 23 and a display module 25. The first load-bearing sensor 23 is arranged on the connecting piece between the desktop and the lifting and regulating component, and the first load-bearing sensor 23 is used to sense the load-bearing weight of the desktop. The display module 25 is used to display the value of the load-bearing weight. In one embodiment, a first load-bearing sensor is arranged on each connecting piece between the desktop and the lifting and regulating component, so as to measure the load-bearing weight of the desktop in different directions, and display it through the display module 25.

[0035] In one embodiment, the desktop of the electric lifting table includes a transparent area (such as glass or plastic), and the display surface of the display module 25 is arranged under the transparent area, so that the display module 25 can display through the transparent area. Being arranged under the transparent area of ​​the desktop, the display module 25 does not protrude from the desktop, and thus does not occupy the placement space on the desktop.

[0036] In one embodiment, the load-bearing monitoring device further includes a second load-bearing sensor 24, which is disposed on the table legs of the fixed support member, and each table leg is provided with a second load-bearing sensor 24. The second load-bearing sensor 24 is used to measure the load of the table legs, and display it through the display module 25. When used at home, the electric lifting table will be placed in a home environment such as a floor, carpet or tile, and the weight of the table corner pressure will be displayed, which can remind the user to protect the ground.

[0037] like Figure 5 As shown, in one embodiment, the first load-bearing sensor 23 and the second load-bearing sensor 24 are also connected to the lifting drive device 3. In the process of lifting and lowering the electric lifting table, if the load-bearing weight sensed by at least one first load-bearing sensor and at least one second load-bearing sensor increases, and the load-bearing weight sensed by other first load-bearing sensors and second load-bearing sensors decreases, the lifting drive device determines that the lifting and lowering of the electric lifting table is blocked, and stops the lifting and lowering of the desktop or makes the desktop rebound when encountering resistance; or, in the process of lifting and lowering the electric lifting table, if the load-bearing weight sensed by at least one first load-bearing sensor and at least one second load-bearing sensor decreases, and the load-bearing weight sensed by other first load-bearing sensors and second load-bearing sensors increases, the lifting drive device determines that the lifting and lowering of the electric lifting table is blocked, and stops the lifting and lowering of the desktop or makes the desktop rebound when encountering resistance. The load-bearing weight sense is applied to the safety protection of the desktop lifting operation.

[0038] In one embodiment, the first load-bearing sensor 23 is also connected to the lifting drive device 3, and is used to send the load-bearing weight of the desktop to the lifting drive device 3, so that the lifting drive device 3 sets the driving current of the motor that controls the lifting speed of the desktop according to the load-bearing weight of the desktop. In one embodiment, the lifting drive device 3 sets the driving current of the motor that controls the lifting speed of the desktop according to the maximum value or average value of the load-bearing weight sensed by the first load-bearing sensor 23.

[0039] In one embodiment, the sensor types of the first load-bearing sensor and the second load-bearing sensor include an S-type load-bearing sensor, a cantilever-type load-bearing sensor, or a spoke-type load-bearing sensor.

[0040] In one embodiment, the display module 25 is further used to display the maximum bearing weight of the desktop, and to display a bearing overload prompt message when the bearing weight of the desktop is greater than a preset weight value.

[0041] In one embodiment of the present application, an electric lift table is also disclosed, including the load-bearing monitoring device as described above. The electric lift table disclosed in the embodiment of the present application includes a desktop, an I-shaped support assembly, a lifting drive device and a hand-controlled terminal. The load-bearing monitoring device includes a first load-bearing sensor and a display module. The first load-bearing sensor is arranged on the connecting piece between the desktop and the lifting and regulating component. The first load-bearing sensor is used to sense the load-bearing weight of the desktop, and the display module is used to display the value of the load-bearing weight of the desktop in real time. Since the load-bearing weight of the desktop can be displayed in real time, it is ensured that the load-bearing weight of the desktop of the electric lift table will not be overloaded when it is lifted or lowered, which greatly improves the safety and reliability of the electric lift table.

[0042] Embodiment three: In one embodiment of the present application, a grating monitoring device for an electric lift table is also disclosed, wherein the electric lift table includes a desktop, an I-shaped support assembly, a lifting drive device and a hand-controlled terminal. The I-shaped support assembly includes a lifting and regulating component and a fixed support component, and the lifting and regulating component and the fixed support component are connected in a sleeve manner. The lifting and regulating component is fixedly connected to the desktop, and the fixed support component is used to horizontally support the desktop through the lifting and regulating component. The lifting drive device is arranged on the I-shaped support assembly, and the lifting and driving device is used to adjust the sleeve depth of the lifting and regulating component and the fixed support component by driving the motor to rotate, so as to control the lifting height of the electric lift table. The hand-controlled terminal is electrically connected to the lifting drive device. A key switch is arranged on the hand-controlled terminal, and a lifting and lowering electrical signal is output to the lifting and lowering drive device by turning the key switch on or off, so that the lifting and lowering drive device can lift and lower the desktop in response to the lifting and lowering electrical signal.

[0043] Please refer to Figure 6 , is a structural block diagram of a grating monitoring device in an embodiment, wherein the grating monitoring device 53 includes a grating infrared beam sensor 26 and a display unit 27. The grating infrared beam sensor 26 is disposed on the I-shaped support assembly, and is used to monitor the set depth value of the lifting and lowering control member and the fixed support member, so as to obtain the height value of the desktop according to the set depth value. The display unit 27 is used to display the height value of the desktop.

[0044] Please refer to Figure 7 , is a schematic diagram of the principle of a grating infrared beam sensor in an embodiment, the grating infrared beam sensor includes an infrared emitter 31 and a light receiver 32, the infrared emitter 31 emits infrared light to form a light curtain, which is received by the light receiver 32 located opposite. The light receiver 32 includes a main grating bar 321, an indicator grating 322 and a photoelectric element 323, and the photoelectric element 323 of the light receiver 32 receives the infrared light and sends an electrical signal.

[0045] In one embodiment, the infrared emitter 31 and the light receiver 32 are fixedly arranged on the lifting and regulating member and the fixed support member, respectively, so as to obtain the set depth value according to the light receiving position of the light receiver. In one embodiment, when the electric lifting table lifts the desktop, the grating infrared counter-radiation sensor is also used to obtain the change value of the set depth value of the lifting and regulating member and the fixed support member according to the change speed of the light receiving position of the light receiver, and obtain the instant lifting speed of the desktop according to the change value of the set depth value. In one embodiment, the display unit is also used to display the instant lifting speed.

[0046] Please refer to Figure 8 , is a cross-sectional schematic diagram of a sleeve assembly of an I-shaped support assembly in an embodiment. In one embodiment, the infrared emitter 31 is disposed in the hollow cavity of the lifting and regulating member 22, and the light receiver 32 is disposed in the hollow cavity of the fixed support member 22. In one embodiment, the electric lifting table includes at least two I-shaped support assemblies, and each I-shaped support assembly is provided with a grating infrared counter-radiation sensor.

[0047] like Figure 6 As shown, in one embodiment, the grating monitoring device 53 is also connected to the lifting drive device 3, and is used to send the instantaneous height value of the desktop to the lifting drive device 3, so as to be used for lifting height verification when the lifting drive device 3 performs a desktop lifting operation.

[0048] In one embodiment, the desktop of the electric lifting table is transparent, and the display surface of the display unit is arranged under the desktop.

[0049] In one embodiment of the present application, an electric lifting table is also disclosed, including the grating monitoring device as described above. In one embodiment, the hand-controlled terminal of the electric lifting table is provided with a display screen, and the display unit of the grating monitoring device is provided on the display screen. In one embodiment, the display screen is an LED screen.

[0050] The grating monitoring device disclosed in the embodiment of the present application includes a grating infrared counter-beam sensor and a display unit. The grating infrared counter-beam sensor is arranged on the I-shaped support assembly. The grating infrared counter-beam sensor is used to monitor the set depth value of the lifting and regulating components and the fixed support components in the I-shaped support assembly to obtain the height value of the desktop according to the set depth value. The display unit is used to display the height value of the desktop. Since the grating infrared counter-beam sensor is used to detect the set depth value of the lifting and regulating components and the fixed support components to obtain the desktop height value, the desktop height adjustment accuracy is higher, and because it is displayed in real time through the display unit, the user experience is greatly improved.

[0051] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. A lifting monitoring system for an electric lifting table, characterized in that: The electric lifting table comprises a desktop, an I-shaped support assembly and a lifting drive device; The I-shaped support assembly includes a lifting and regulating component and a fixed support component, and the lifting and regulating component is connected to the fixed support component in a sleeve manner; The lifting and regulating member is fixedly connected to the desktop, and the fixed supporting member is used to horizontally support the desktop through the lifting and regulating member; The lifting drive device is arranged on the I-shaped support assembly, and the lifting drive device is used to adjust the sleeve depth of the lifting regulating component and the fixed support component by driving the motor to rotate, so as to control the lifting height of the electric lifting table; The lifting monitoring system includes a load-bearing monitoring device, a gyroscope monitoring device and a grating monitoring device; The load-bearing monitoring device is used to monitor the load-bearing weight of the desktop in real time, and convert the load-bearing weight into a load-bearing electrical signal and send it to the lifting drive device; When the electric lifting table lifts the desktop, the lifting drive device sets the driving current of the motor according to the value of the load-bearing electrical signal, so that the desktop is lifted and lowered at a preset first lifting speed; The gyroscope monitoring device is used to monitor the lifting acceleration of the desktop in real time, and send the lifting acceleration to the lifting drive device; The lifting drive device is used to verify the first lifting speed according to the lifting acceleration; The grating monitoring device is used to monitor the sleeve depth values ​​of the lifting and regulating member and the fixed support member in real time, so as to obtain the relative moving speed of the lifting and regulating member and the fixed support member according to the change of the sleeve depth value, and send the relative moving speed to the lifting drive device; the lifting drive device is used to verify the first lifting speed according to the relative moving speed; The lifting drive device is also used to stop the lifting operation of the electric lifting table when the difference between the relative moving speed and the first lifting speed is greater than a preset upper limit value during the lifting control of the electric lifting table.

2. The lifting monitoring system according to claim 1, characterized in that: The lifting drive device sets the driving current of the motor according to the value of the load-bearing electrical signal to ensure that the desktop is lifted or lowered at a preset first lifting speed, including: When different load-bearing weights of the desktop are obtained by testing, the motor maintains the desktop lifting speed at the driving current value of the first lifting speed to obtain a corresponding curve between the load-bearing weight and the driving current; When the electric lifting table is raised or lowered, the driving current of the motor is set according to the current load-bearing weight of the table top and the corresponding curve between the load-bearing weight and the driving current.

3. The lifting monitoring system according to claim 1, characterized in that: The load-bearing monitoring device includes a first load-bearing sensor; the first load-bearing sensor is arranged on the connecting piece between the desktop and the lifting and regulating component, and one first load-bearing sensor is arranged on each connecting piece; the first load-bearing sensor is used to sense the load-bearing weight of the desktop.

4. The lifting monitoring system according to claim 3, characterized in that: The load-bearing monitoring device includes a second load-bearing sensor; the second load-bearing sensor is arranged on the table foot of the fixed support member, and one second load-bearing sensor is arranged on each table foot; The lifting drive device is also used for determining that the lifting of the electric lifting table is obstructed, and stopping the lifting or making the tabletop rebound when encountering an obstruction if the load-bearing weight sensed by at least one of the first load-bearing sensors and at least one of the second load-bearing sensors increases and the load-bearing weights sensed by the other first load-bearing sensors and the second load-bearing sensors decrease during the lifting and lowering control of the electric lifting table; The lifting drive device is also used to determine that the lifting of the electric lifting table is obstructed, and stop the lifting or make the tabletop rebound when encountering resistance if the load-bearing weight sensed by at least one of the first load-bearing sensors and at least one of the second load-bearing sensors decreases and the load-bearing weights sensed by other first load-bearing sensors and second load-bearing sensors increase during the lifting control of the electric lifting table.

5. The lifting monitoring system according to claim 1, characterized in that: The grating monitoring device includes a grating infrared counter-radiation sensor, which includes an infrared emitter and a light receiver; the infrared emitter and the light receiver are respectively fixed on the lifting and regulating component and the fixed supporting component to obtain the relative moving speed based on the changing speed of the light receiving position of the light receiver.

6. The lifting monitoring system according to claim 5, characterized in that: The grating monitoring device is also used to obtain the desktop height of the electric lifting table according to the light receiving position of the light receiver.

7. The lifting monitoring system according to claim 5, characterized in that: The infrared emitter and the light receiver are arranged in a cavity of a sleeve assembly used for sleeve connection of the lifting and regulating component and the fixed supporting component.

8. The lifting monitoring system according to claim 1, characterized in that: The gyroscope monitoring device includes an electronic gyroscope, which is fixedly connected to the desktop; the electronic gyroscope is used to monitor the lifting acceleration of the electric lifting table during the lifting process.

9. The lifting monitoring system according to claim 8, characterized in that: The electronic gyroscope is also used to monitor the changes in the lifting acceleration of the electric lifting table during the lifting process, so as to determine the reset position of the desktop when the desktop is reset and calibrated, and to confirm the braking and stopping of the desktop during the lifting process.

10. A method for monitoring the lifting of an electric lifting table, characterized in that: Used in the lifting monitoring system according to any one of claims 1 to 9, the lifting monitoring method comprises: Monitoring the tabletop load-bearing weight of the electric lift table; When the electric lifting table is controlled to be lifted and lowered at a preset first lifting speed, the driving current of the motor driving the lifting and lowering movement of the table top is set according to the load-bearing weight of the table top.

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