JP2021194387A - Electrically-driven lift table control system - Google Patents

Abstract

To provide an electric lift table control system that can control a lift column so as to stop a work before encountering an obstacle.SOLUTION: An electrically-driven lift table control system includes: a controller; a table (1); a lift column (2) connected to the controller via a signal and moving the table vertically; and at least a pair of safety lattices (3) disposed under the table (1) to detect an obstacle. Each safety lattice pair includes a transmission end assembly and a reception end assembly. A clearance is provided between the safety lattices (3) and an undersurface of the table (1). The safety lattices (3) are connected to a controller signal.SELECTED DRAWING: Figure 2

Description

The present invention relates to the technical field of office furniture, and in particular to an electric lift table control system and method that realizes back-off during resistance.

Electric lift platforms are used in the residential, office and medical fields. For example, height-adjustable desks, dining tables, tatami mats, office tables, medical beds, etc. When adjusting the lift platform, if the platform or frame encounters an obstacle, it can destroy the structure of the obstacle or the platform itself, and if the collision object is pushed into the human body, it will cause harm to the human body. May give.

Therefore, there are lift platforms in the prior art market that have resistance backoff capabilities, but all such lift platforms determine if they have been resisted after encountering an obstacle before performing the backoff operation. .. Long judgment times can destroy obstacles and the structure of the platform itself, even injuring the human body.

The technical problem to be solved by the present invention is to provide an electric lift table control system capable of backing off during resistance, which can be controlled to stop the operation of the lift column before encountering an obstacle. That is.

The embodiments adopted in the present invention are as follows. That is, it includes a controller, a table, and a lift column that is connected to the controller by a signal and moves the table vertically. Further, in the electric lift table control system that realizes back-off at the time of resistance, a safety grid for detecting at least one set of obstacles arranged under the table is further provided. Each set of safety grids comprises a transmit end assembly and a receive end assembly, a gap is provided between the safety grid and the bottom surface of the table, and the safety grid is connected to the controller signal.

Preferably, a first mounting plate is provided below each side of the table, and a transmitting end assembly and a receiving end assembly of the safety grid are provided on the facing surface between the two first mounting plates, respectively. The placement allows the beam transmitted from the transmit end assembly in the safety grid to be received by the receive end assembly.

Preferably, a second mounting plate is provided inside the two lift columns, and the transmitting end assembly and the receiving end assembly of the safety grid are arranged on the facing surfaces of the two second mounting plates, respectively. As a result, the beam emitted from the transmitting end assembly in the safety grid can be received by the receiving assembly.

Preferably, a first connecting plate is further provided, and the first connecting plate connects, fixes and integrally fixes the first mounting plate and the second mounting plate on each side of the table. Form a board.

Preferably, at the bottom of the table, two third mounting plates are provided between the two lift columns, and the facing surfaces between the two third mounting plates are the transmitting end assembly and the receiving end of the safety grid, respectively. The assembly is arranged, and the transmitting end assembly and the receiving end assembly of the safety grid are arranged at the opposite positions between one third mounting plate and the table side, respectively, and another third mounting plate and the table are arranged. The transmit end assembly and the receive end assembly of the safety grid are located at opposite positions between the opposite sides of the safety grid, and all safety grids are connected to the controller signal.

Preferably, the outside of the two lift columns is provided with a fourth mounting plate, one of which is opposed to the side of the table with the transmission end assembly of the safety grid, respectively. The receiving end assembly is attached, and the transmitting end assembly and the receiving end assembly of the safety grid are arranged at opposite positions between the other second mounting plate and the opposite side of the table, respectively.

Preferably, a second connecting plate is further provided, and the second connecting plate connects and fixes the third mounting plate and the fourth mounting plate on each side of the table, respectively, to form one whole. Form a fixed plate.
Preferably, a touch sensor is provided at the lower part of each of the mounting plates, and the touch sensor is connected to the controller signal.
Preferably, the range of the gap is 2 to 20 cm.

Comparing the above structure with the prior art, the present invention has the following advantages. That is, by installing the safety grid so as to detect the obstacle, the safety grid can detect the obstacle before encountering the obstacle. That is, information can be fed back to the controller, and the controller can control the stop or retreat of the lift column. In this way, obstacles can be backed off and the possibility of the table hitting the obstacles can be significantly reduced.

If the table corresponds to the width of the lift column, install mounting plates on both sides of the table. A part of the mounting plate is further installed in the portion of the mounting plate blocked by the lift pillar. By installing the safety grid on the mounting plate and connecting the mounting plates of both parts with the connecting plate, not only the assembly is convenient, but also the coverage range of the light from the safety grid can be made more complete.
Also, by installing a touch sensor at the bottom of the mounting plate, the only blind spot under the table is covered by the touch sensor.

By setting the gap between the safety grid and the lower surface of the table to 2-20 cm, the distance between the safety grid and the lower surface of the table becomes large, the reaction judgment time of the controller becomes sufficient, and the reliability becomes high.

Other embodiments adopted by the present invention are as follows. That is, in the electric lift table control method that realizes back-off at the time of resistance, the state of the lift table is detected at the time interval X. If the lift table is stationary, it will continue to be detected. If the lift table is in motion, step S1 to proceed to the next step and the safety grid will perform the task of detecting whether the obstacle is in the grid region of the safety grid. If it does not detect that the obstacle is in the grid area, it will continue to detect it. If it detects that an obstacle is in the grid region, it determines that there is an obstacle, and the controller comprises step S2, which controls the lift column to stop or back off work.

Comparing the above structure with the prior art, the present invention has the following advantages. That is, by installing the safety grid so as to detect the obstacle, the safety grid can detect the obstacle before encountering the obstacle. That is, information can be fed back to the controller, which can control the stop or retreat of the lift column, thus backing off obstacles and the possibility of the table hitting the obstacles. Can be significantly reduced.

Is a connection block diagram of an electric lift table control system that realizes back-off at the time of resistance according to the present invention. Is a schematic structural diagram of a third embodiment of the present invention. Is a side view of the third embodiment of the present invention. Is a schematic diagram of the operation of the safety grid in the third embodiment of the present invention. Is a schematic configuration diagram of a ninth embodiment of the present invention. Is a side view of a ninth embodiment of the present invention. Is a schematic diagram showing the operation of the safety grid in the ninth embodiment of the present invention.

Hereinafter, the present invention will be further described with reference to specific examples, but the present invention is not limited to the following specific embodiments.

The prior art lift table includes a controller, a table 1, a base, and a lift column 2 for adjusting the distance between the table and the base. The lift column and the controller may be connected by wire or wirelessly. The lift column 2 is usually provided with a power mechanism for operating the lift column 2, generally a motor. The lift column 2 includes an outer casing fixed to the table 1 and an inner casing fixed to the base, and the outer casing and the inner casing can move to each other. The lift table is conventional in the prior art and will not be described in detail here.

Further, the safety grid 3 is a commercial product and is also common in the conventional technology, but most of the safety grids in the conventional technology are mainly used to prevent the user's body from entering a dangerous area. .. In addition, some of them function as safety protection and have an error correction function for detecting the size and position of the product. However, this application is mainly installed on a lift table and has a function of detecting obstacles. Further, a set of safety grids 3 generally includes a sender assembly and a receiver assembly, the sender component usually comprises a plurality of transmitters, and the receiver assembly also corresponds to a plurality of receivers. A signal connection with the controller is generally required for the safety grid to be set.

Specific Example 1: Since the table 1 has a small width equal to the width of the two lift columns 2, a first mounting plate 4 is provided at the lower end of the table 1. Further, the width of the first mounting plate 4 can be set according to the user's request, and may be half the width of the table 1 or the same width as the table 1. The first mounting plate 4 is installed according to the environment in which the lift table is placed and the usage habits. For example, it is arranged perpendicular to the table 1, the first mounting plate 4 on one side is provided with a transmitting end assembly, and the receiving side is located at a position corresponding to the first mounting plate 4 on the other side. As long as the assembly is provided, that is, the light energy delivered from the transmitting assembly is received by the receiving component, the positions of the two are considered to correspond. Further, the distance between the transmitting end assembly and the receiving end assembly and the lower surface of the table 1 is 2 to 20 cm, and this specific embodiment is preferably 10 cm. In this specific embodiment, since the light emitted by the transmitting end assembly is horizontal, the light received by the receiving end assembly is also horizontal, that is, the two assemblies can be set at the same height. In this way, in the absence of obstacles, the optical signal from the transmit end assembly is received by the receive end assembly. If there is an obstacle, the light from some transmitting end assemblies is blocked by the obstacle, the receiving end assembly corresponding to this part cannot receive the light in this part, and there is an obstacle in an area. Can be detected.

The specific embodiment 2 is different from the specific embodiment 1, and a part of the first mounting plate 4 is shielded by the lift column 2. Therefore, in the specific embodiment 2, the transmission end assembly and the reception end assembly are not provided in the portion where the first mounting plate 4 is blocked, and the first mounting plate 4 is blocked by the lift column 2. A second mounting plate 5 is provided on the other surface. An opposed transmission end assembly and a reception end assembly are provided at positions of the two second mounting plates 5.

The difference between the specific third embodiment and the specific second embodiment is that the first mounting board 4 and the second mounting board 5 on both sides of the table 1 of the third embodiment are connected to the first connecting board. The point is that it is fixedly connected at 6 to form a fixed substrate. When installing, the fixing plate can be installed directly and does not need to be installed multiple times.

The difference between the specific fourth embodiment and the specific third embodiment is that the touch panel 10 is arranged on the bottom surface of the first mounting board 4 and the second mounting board 5 of the fourth embodiment. And the touch sensor 10 is connected to the controller. Specific settings are made as necessary. The touch sensor 10 is a general sensor that generates a trigger signal when touched, and will not be described in detail here.

The difference between the specific fifth embodiment and the specific fourth embodiment is that the grid adopted in the specific embodiment 5 is an anti-radiation grid, that is, a transmitting end assembly and a receiving end assembly. Are spaced apart from each other, or one transmit end assembly can transmit multiple beams, not just one beam, and can be received by multiple receive end assemblies.

A specific sixth embodiment is as follows. That is, since the width of the table 1 is larger than the width of the two lift columns 2, the third mounting plate 7 is arranged inside the two lift columns 2, and the third mounting plate 7 is used as the lift column 2. It may be fixed to or under the table 1 at the top. The third mounting plate 7 is arranged vertically on the table 1, and the transmitting end assembly and the receiving end assembly of the safety grid 3 are attached to the facing surfaces of the two third mounting plates 7, respectively. Since these safety grids 3 are arranged between the two third mounting plates 7, they can be arranged horizontally. Further, the transmission end assembly and the reception end assembly of the safety grid 3 are attached to the facing positions between the third mounting plate 7 and the table 1 side, respectively. Since there is a height difference between the table 1 side and the bottom surface of the third mounting plate 7, these safety grids 3 need to be placed at an angle, i.e., the light emitted from the transmit end assembly. Is inclined. Further, the transmitting end assembly and the receiving end assembly of the safety grid 3 are also attached to the opposite positions between the other third mounting plate 7 and the other side of the table 1, respectively. Due to the height difference between the other opposite side of the table 1 and the bottom of the third mounting plate 7, these safety grids 3 also need to be installed tilted, i.e. radiate from the transmit end assembly. The light that is emitted is also inclined. However, it has not been determined on which side of the specific third mounting plate 7 the transmitting end assembly is located and which side the receiving end assembly is located, and it is set as necessary. can.

The differences between the specific seventh embodiment and the specific sixth embodiment are as follows. That is, since a part of the third mounting plate 7 is blocked by the lift column 2, the fourth mounting plate 8 should be installed on the outside of the two lift columns 2 and originally mounted on the third mounting plate 7. It is necessary to attach the safety grid 3 partially blocked by the lift column 2 to the corresponding fourth mounting plate 8. This can be set as needed.

The differences between the specific eighth embodiment and the specific seventh embodiment are as follows. That is, in the specific embodiment 8, the third mounting plate 7 and the fourth mounting plate 8 on each side of the table 1 are fixedly connected by the second connecting plate 9 to form and mount the fixing plate. At that time, the fixing plate may be attached directly, and it is not necessary to install it multiple times.

The differences between the specific ninth embodiment and the specific eighth embodiment are as follows. That is, a touch sensor 10 is provided at the bottom of the third mounting plate 7 and the fourth mounting plate 8 of the specific ninth embodiment, and the touch sensor 10 is connected to the controller by a signal. Specifically, it can be set as needed. Further, the touch sensor 10 is a normal sensor, and when it comes into contact with it, a trigger signal is generated, which will not be described in detail here.

The differences between the specific tenth embodiment and the specific ninth embodiment are as follows. That is, fittings are installed at the lower portions of both sides of the table 1 of the specific embodiment 10. As a result, the safety grid 3 originally installed directly on both sides of the table 1 can be attached to the fixture, and the distance between the safety grid 3 and the table 1 becomes large. Further, the above embodiment can be controlled by the following control method.

Step S1: The state of the lift table is detected at the time interval X, and if the lift table is in the stationary state, it is continuously detected. If the lift table is in motion, proceed to the next step. The X time can be set to a relatively small time, for example, about 1 second.

Step S2: The safety grid performs a task of detecting whether an obstacle is in the grid region of the safety grid. If it does not detect that the obstacle is in the grid area, it will continue to detect it, and if it detects that the obstacle is in the grid area, it will determine that there is an obstacle and the controller will stop working or back off. To control the lift column.

Further, if a lift table as in the specific fourth embodiment or the specific ninth embodiment is adopted, it is necessary that the safety grid operates and the touch sensor operates at the same time. The area covered by the safety grid is the area between the safety grids of each set, but the mounting plate itself is not covered. Therefore, by installing the touch sensor under the mounting plate, the table can be backed off at the time of resistance without a dead zone.

The specific purposes of the invention of this application are as follows. That is, the lift table is likely to be encountered when the lift table is activated, which can destroy the structure of the obstacle or the platform itself and damage the human body, so stop or back the lift table before encountering the obstacle. I think it is preferable to let it. Further, since the safety grid can generate a grid region, it can function as a detection area. That is, when the transmitter in the transmit end assembly of the safety grid emits light and then is received by the receiver in the receive end assembly, the area covered by the light becomes the detection area and there is an obstacle in the detection area. The safety grid can be detected and then the signal transmitted to the controller before the controller can control the lift column to stop or back off work. This allows the table to stop or back off before it encounters an obstacle. In addition, a certain gap is required between the detection area of the safety grid and the lower surface of the table. In a specific embodiment of the present application, a range of 2 to 20 cm is set mainly in order to secure a certain reaction time for the controller. In this way, after an obstacle is detected in the detection area, a signal is sent to the controller, and then the controller controls the lift column to stop the operation, and a certain buffer time is required between them. Therefore, it is necessary to set the buffer gap. However, the length of this buffer gap is mainly related to the reaction time of the controller and the lift speed of the lift column, and the specific length can be set according to a specific condition.

Finally, it should be noted that the above examples are used solely to illustrate embodiments of the invention and are not intended to be limiting. Although the invention has been described in detail with reference to the aforementioned examples, those skilled in the art may still be able to modify the embodiments described in the above examples or replace some technical features equivalently. Should be understood. Such modifications or substitutions do not deviate from the essence of the corresponding embodiments from the spirit and scope of the embodiments of each embodiment of the invention.

1, table, 2, lift column, 3, safety grid, 4, first mounting plate, 5, second mounting plate, 6, first connection plate, 7, third mounting plate, 8, fourth Mounting plate, 9, 2nd connection plate, 10, touch sensor

Claims (10)

It is an electric lift table control system equipped with a controller, a table (1), a lift column (2) that connects the controller with a signal and moves the table vertically, and realizes back-off at the time of resistance. ,
Further equipped with a safety grid (3) for detecting at least one set of obstacles placed under the table (1), each set of safety grids includes a transmit end assembly and a receive end assembly, and a safety grid ( An electric lift table control system characterized in that a gap is provided between 3) and the lower surface of the table (1), and the safety grid (3) is connected to a controller signal. A first mounting plate (4) is provided below both sides of the table (1), and a safety grid (3) is provided on the facing surface between the two first mounting plates (4). The electric motor according to claim 1, wherein the beam transmitted from the transmitting end assembly in the safety grid (3) can be received by the receiving end assembly by arranging the transmitting end assembly and the receiving end assembly of). Lift table control system. A second mounting plate (5) is provided inside the two lift columns (2), and a safety grid (3) is transmitted to the facing surfaces of the two second mounting plates (5), respectively. The electric lift table control system according to claim 2, wherein the beam transmitted from the transmitting end assembly in the safety grid (3) can be received by the receiving end assembly by arranging the end assembly and the receiving end assembly. .. A first connecting plate (6) is further provided, and the first connecting plate (6) is a first mounting plate (4) and a second mounting plate (5) on each side of the table (1). ) Are connected to each other and fixed to form an integral fixing plate, according to claim 3. The electric lift table control system. At the bottom of the table (1), two third mounting plates (7) are provided between the two lift columns (2), and on the facing surface between the two third mounting plates (7). , The transmitting end assembly and the receiving end assembly of the safety grid (3) are arranged, respectively, and the safety grid (3) is located at the opposite position between the third mounting plate (7) and the table (1) side, respectively. The transmitting end assembly and the receiving end assembly are arranged, and the transmitting end assembly of the safety grid (3) and the transmitting end assembly of the safety grid (3) are located at opposite positions between the other third mounting plate (7) and the opposite side of the table (1), respectively. The electric lift table control system according to claim 1, wherein a receiving end assembly is arranged and all safety grids (3) are connected to a controller signal. A fourth mounting plate (8) is provided on the outside of the two lift columns (2), one of which is located at an opposite position between the fourth mounting plate (8) and the side of the table (1). The transmit end assembly and the receive end assembly of the safety grid (3) are attached, respectively, and the safety grid (3) is located at the opposite position between the other second mounting plate (5) and the opposite side of the table (1), respectively. The electric lift table control system according to claim 5, wherein the transmitting end assembly and the receiving end assembly of the above are arranged. A second connection plate (9) is further provided, and the second connection plate (6) includes a third mounting plate (7) and a fourth mounting plate (8) on each side of the table (1). ) Are connected and fixed to form one overall fixing plate, according to claim 6. The electric lift table control system. The invention according to any one of claims 1-7, wherein a touch sensor (10) is provided at the lower portion of each of the mounting plates, and the touch sensor (10) is connected to a controller signal. Electric lift table control system. The electric lift table control system according to claim 1, wherein the range of the gap is 2 to 20 cm. It is an electric lift table control method that realizes back-off at the time of resistance.
Step S1 to detect the state of the lift table at the time interval X, continue to detect if the lift table is stationary, and proceed to the next step if the lift table is in motion.
The safety grid works to detect if an obstacle is in the grid area of the safety grid, and if it does not detect that the obstacle is in the grid area, it continues to detect it and detects that the obstacle is in the grid area. When this is done, the controller determines that there is an obstacle, and the controller controls the lift column to stop or back off the work, and step S2.
An electric lift table control method comprising:

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