Single-motor height-adjustable table having obstacle detection function

Abstract

A single-motor height-adjustable table having an obstacle detection function, the table comprising an electric motor, lifting stand columns, and obstacle detection structures, wherein the electric motor is in transmission connection with the lifting stand columns on two sides via a transmission rod; each lifting stand column comprises a gear box, a lead screw assembly and a top plate, the gear box being in transmission connection with both the transmission rod and the lead screw assembly; and each obstacle detection structure is arranged on the top plate, and is configured to detect the deformation generated by the relative acting force between the top plate and the gear box and determine the obstruction state. In the structure of the single-motor height-adjustable table, the top plates of the lifting stand columns are located directly beneath a table top, so that the arrangement of the obstacle detection structures on the top plates is more suitable for the single-motor height-adjustable table. In addition, the core component of the obstacle detection structure is a piezoelectric plate that detects strain and stress, and has a lower cost than a gyroscope sensor.

Description

Single motor lift table with resistance detection Technical Field

[0001] The present invention relates to the field of furniture, and in particular to a single-motor lifting table with an resistance detection function. Background Art

[0002] Electric furniture, such as electric beds and electric tables, has functions such as automatic lifting and automatic flipping, which is convenient for users. In order to prevent electric furniture from pinching users during activities, electric furniture is usually equipped with an obstacle retraction function. That is, when the device senses an obstacle during movement, it will immediately move in the opposite direction to avoid the obstacle, thereby preventing damage to the furniture or pinching the user.

[0003] At present, most similar products mainly use gyroscope sensors as the key components to achieve retraction when encountering resistance. The principle is to detect the changes in acceleration and angular acceleration during the collision process, and output corresponding electrical signals to the controller to achieve corresponding operations; however, such a design will greatly increase the cost of the entire product and increase the complexity of installation; for single-motor lifting tables, cost is one of the important factors that need to be considered. Low cost is more conducive to its sales. Therefore, gyroscope sensors are not the best choice for single-motor lifting tables. Lower-cost resistance structures are more suitable for single-motor lifting tables. Technical issues

[0004] In order to solve the above technical problems, the present invention provides a single-motor lifting table with an resistance detection function, including a motor, a lifting column and a resistance detection structure. The motor is connected to the lifting columns on both sides through a transmission rod. The lifting columns include a gear box, a screw assembly and a top plate. The gear box is connected to the transmission rod and the screw assembly respectively. The resistance detection structure is arranged on the top plate and is configured to detect the deformation of the top plate caused by the relative force between the top plate and the gear box and judge the resistance state; considering the structure of the single-motor lifting table, the top plate of the lifting column is located below the table plate, so the resistance detection structure is arranged on the top plate, which is more suitable for the single-motor lifting table, and the core of the resistance detection structure is a piezoelectric piece for detecting strain stress, which has lower cost than the gyroscope sensor. Technical Solutions

[0005] The technical solution of the present invention is achieved as follows:

[0006] A single-motor lift table with an resistance detection function, comprising:

[0007] The motor is connected to the lifting columns on both sides through a transmission rod;

[0008] A lifting column configured to be driven by a motor to perform telescopic movement; the lifting column includes a gear box, a screw assembly, and a top plate located on the top of the lifting column;

[0009] The screw assembly is vertically arranged inside the lifting column, the screw assembly is connected to the gear box, and the screw assembly is configured to drive the lifting column to extend and retract;

[0010] A gear box is disposed inside the lifting column and connected to the top plate. The gear box is respectively connected to the screw assembly and the motor. The gear box is configured to drive the top plate to move when the motor drives the screw assembly to move.

[0011] The resistance detection structure is arranged on the top plate and is configured to detect the deformation amount on the top plate caused by the relative force between the top plate and the gear box, and to judge the resistance state.

[0012] In a single-motor lift table, a single motor is used to control the simultaneous lifting of the lifting columns on both sides. During the lifting of the lifting columns, the table top of the lift table may encounter obstacles. When the table top encounters obstacles, the motor is still driving the gearbox and the screw assembly to move, and the lifting columns connected to the table top will be subject to resistance in the opposite direction of movement, which is specifically reflected in the change of the force between the top plate and the gearbox. As a result, the top plate will deform, and the resistance detection structure determines the resistance state by detecting the deformation of the top plate. At the same time, considering the structure of the single-motor lift table, the top plate of the lifting columns is located below the table top. Therefore, setting up a resistance detection structure on the top plate is more suitable for the single-motor lift table. The core of the resistance detection structure is a piezoelectric plate that detects strain and stress, which has a lower cost than a gyroscope sensor.

[0013] Preferably, the resistance detection structure includes a positioning plate and a piezoelectric plate. The positioning plate is mounted on the top plate, connected to the gearbox, and the top plate and the gearbox are connected via the positioning plate. The piezoelectric plate is mounted on the positioning plate. The combination of the positioning plate and the piezoelectric plate for resistance detection allows for greater adaptability than the top plate of the lifting column, which requires greater rigidity. For example, designs with increased deformation capacity can enhance the piezoelectric plate's resistance detection capabilities.

[0014] Preferably, a relief hole is formed in the middle of the top plate, and a connection portion protrudes downward from the positioning plate, which is disposed in the relief hole. The positioning plate is connected to the gearbox via a first screw. The first screw is used to transmit the positioning plate to the gearbox. When resistance occurs, the positioning plate deforms due to the relative force exerted by the first screw on the positioning plate, and the piezoelectric plate detects resistance.

[0015] Preferably, the positioning plate around the connection is thinned to form a stress concentration area, and the piezoelectric piece is disposed on the stress concentration area. The positioning plate around the connection has a bottom surface that is thinner from bottom to top. The thinned stress concentration area has a stronger deformation capacity, and the piezoelectric piece is disposed on it, thereby improving detection sensitivity.

[0016] Preferably, the gearbox is provided with an upwardly projecting positioning post, and the positioning plate is provided with a vertically extending positioning hole. The positioning post is disposed in the positioning hole, and the first screw is connected to the gearbox through the positioning hole. The positioning post can be used to position the gearbox and the lifting column. The positioning post is first inserted into the positioning hole to position the gearbox. After positioning is completed, the gearbox is connected to the positioning plate via the first screw to ensure a stable connection.

[0017] Preferably, both ends of the positioning plate are connected to the top plate via second screws.

[0018] Preferably, a stepped portion is formed on the positioning plate surrounding the second screw, the stepped portion including at least a first step and a second step, the first step having a larger diameter than the second step, and the height of a plane on which the first step lies greater than the height of a plane on which the second step lies. The first step and the second step are arranged from the outside to the inside, both the first step and the second step are annular, and a height difference is formed between the first step and the second step.

[0019] Preferably, the resistance detection structure further includes an elastic sheet disposed on the first step, and the piezoelectric sheet disposed on the elastic sheet; a second screw extends downward through the elastic sheet and the step and connects to the top plate. The height difference between the first and second steps provides space for elastic deformation of the elastic sheet. When the desktop load increases, the elastic sheet can bend downward and abut against the second step, thereby continuing to deform based on the second step, effectively preventing permanent creep of the elastic sheet. The elastic sheet also further increases the resistance detection sensitivity of the piezoelectric sheet.

[0020] Preferably, the positioning plate is an aluminum plate, which has lower cost and is more deformable than the top plate.

[0021] Preferably, the resistance detection structure includes a piezoelectric sheet, which is attached to the top plate. The piezoelectric sheet is directly attached to the top plate, which has a simple structure, is easy to install and has low cost. Beneficial effects

[0022] The design starting point, concept and beneficial effects of the present invention using the above technical solution are:

[0023] In a single-motor lift table, a single motor is used to control the simultaneous lifting of the lifting columns on both sides. During the lifting of the lifting columns, the table top of the lift table may encounter obstacles. When the table top encounters obstacles, the motor is still driving the gearbox and the screw assembly to move, and the lifting columns connected to the table top will be subject to resistance in the opposite direction of movement, which is specifically reflected in the change of the force between the top plate and the gearbox. As a result, the top plate will deform, and the resistance detection structure determines the resistance state by detecting the deformation of the top plate. At the same time, considering the structure of the single-motor lift table, the top plate of the lifting columns is located below the table top. Therefore, setting up a resistance detection structure on the top plate is more suitable for the single-motor lift table. The core of the resistance detection structure is a piezoelectric plate that detects strain and stress, which has a lower cost than a gyroscope sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a schematic diagram of the three-dimensional structure of the lifting table in Example 1 of the present invention;

[0025] FIG2 is a second schematic diagram of the three-dimensional structure of the lifting table in Example 1 of the present invention;

[0026] FIG3 is a schematic diagram of a three-dimensional structure in which an obstruction detection structure is arranged on a top plate in Example 1 of the present invention;

[0027] FIG4 is a cross-sectional view of a positioning plate disposed on a top plate in Example 1 of the present invention;

[0028] FIG5 is a schematic diagram of the connection between the positioning plate and the top plate in Example 1 of the present invention;

[0029] FIG6 is a schematic diagram of the three-dimensional structure of the positioning plate in Example 1 of the present invention;

[0030] FIG7 is a schematic diagram of a three-dimensional structure in which an obstruction detection structure is disposed on a top plate in Example 2 of the present invention;

[0031] FIG8 is a cross-sectional view of an obstruction detection structure provided on a top plate in Example 2 of the present invention;

[0032] FIG9 is a schematic diagram of the piezoelectric sheet and the spring sheet mounted on the stepped portion in Example 2 of the present invention.

[0033] The figures are marked as follows: motor 1; transmission rod 2; lifting column 3; inner tube 301; outer tube 302; gear box 4; screw assembly 5; top plate 6; table plate 7; crossbeam 8; table leg 9; side plate 10; positioning plate 11; piezoelectric sheet 12; avoidance hole 13; connecting part 14; positioning column 15; positioning hole 16; stress concentration part 17; elastic sheet 18; stepped part 19; first step 191; second step 192. Modes for Carrying Out the Invention

[0034] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0035] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0036] In the description of the present invention, the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0037] The specific implementation of the present invention is as follows: Example

[0038] As shown in Figures 1-3, the present invention provides a single-motor lift table with an resistance detection function, comprising:

[0039] The motor 1 is connected to the lifting columns 3 on both sides through a transmission rod 2;

[0040] The lifting column 3 is configured to be driven by the motor 1 to perform telescopic movement; the lifting column 3 includes a gear box 4, a screw assembly 5 and a top plate 6 located on the top of the lifting column 3;

[0041] The screw assembly 5 is vertically arranged inside the lifting column 3, the screw assembly 5 is in transmission connection with the gear box 4, and the screw assembly 5 is configured to drive the lifting column 3 to extend and retract;

[0042] The gear box 4 is disposed inside the lifting column 3 and connected to the top plate 6. The gear box 4 is respectively connected to the screw assembly 5 and the motor 1. The gear box 4 is configured to drive the top plate 6 to move when the motor 1 drives the screw assembly 5 to move.

[0043] The resistance detection structure is provided on the top plate 6 and is configured to detect the deformation amount of the top plate 6 caused by the relative force between the top plate 6 and the gear box 4 and determine the resistance state.

[0044] Specifically, in a single-motor lifting table, a single motor 1 is used to control the simultaneous lifting of the lifting columns 3 on both sides. During the lifting of the lifting columns 3, the table top 7 of the lifting table may encounter obstacles. When the table top 7 encounters obstacles, the motor 1 is still driving the gear box 4 and the screw assembly 5 to move, and the lifting columns 3 connected to the table top 7 will be subject to resistance in the opposite direction of movement, which is specifically reflected in the change of the force between the top plate 6 and the gear box 4. As a result, the top plate 6 will be deformed, and the resistance detection structure determines the resistance state by detecting the deformation of the top plate 6. At the same time, considering the structure of the single-motor lifting table, the top plate 6 of the lifting column 3 is located below the table top 7. Therefore, an resistance detection structure is set on the top plate 6, which is more suitable for a single-motor lifting table. The core of the resistance detection structure is the piezoelectric piece 12 for detecting strain stress, which is lower in cost than a gyroscope sensor. The piezoelectric sheet 12 is connected to the controller of the lifting table through a signal line. The deformation threshold can be pre-written in the controller. The deformation generated by the piezoelectric sheet 12 is converted into an electrical signal and compared with the above threshold. If the threshold is reached or exceeded, the controller will send a corresponding control signal to stop the current lifting or lowering action.

[0045] Specifically, as shown in Figures 1-5, the lifting table also includes a table top 7, a crossbeam 8 and table legs 9. The table top 7 is installed above the two lifting columns 3, and the table legs 9 are installed below the two lifting table columns. The crossbeam 8 is arranged below the table top 7 and the two ends of the crossbeam 8 are connected to the two lifting columns 3; the motor 1 is installed beside the crossbeam 8 and installed on one of the two lifting columns 3; the transmission rod 2 is inserted in the motor 1 and is laterally arranged between the two lifting columns 3. The two ends of the transmission rod 2 are respectively inserted in the gear boxes 4 of the two lifting columns 3 to realize the transmission between the motor 1 and the gear box 4; the upper end of the screw assembly 5 is inserted in the gear box 4 , the transmission of the screw assembly 5 and the motor 1 is realized through the gear box 4; the lifting column 3 includes an inner tube 301 and an outer tube 302, the outer tube 302 is sleeved on the outside of the inner tube 301 and the inner tube 301 and the outer tube 302 are slidably matched, the outer tube 302 is connected to the table board 7, the inner tube 301 is connected to the table leg 9, the top plate 6 is located at the upper end of the inner tube 301, the gear box 4 is connected to the outer tube 302, and the screw assembly 5 is connected to the inner tube 301; a side panel 10 is provided on the upper end of the outer tube 302, the side panel 10 is perpendicular to the lifting column 3, and the side panel 10 is fixedly connected to the table board 7, therefore, the outer tube 302 is connected to the table board 7 through the side panel 10 and the crossbeam 8.

[0046] Furthermore, when the motor 1 drives the lifting column 3 to extend and the table top 7 of the lifting table is raised, and the table top 7 encounters resistance at the top, the resistance is transmitted to the outer tube 302 through the crossbeam 8 and the side panel 10. At this time, a relative force will be generated between the top plate 6 and the gear box 4, and the resistance detection structure can detect the relative force to determine the resistance situation; similarly, when the table top 7 is lowered and encounters resistance at the bottom, a relative force will also be generated between the top plate 6 and the gear box 4, which will be detected by the resistance detection structure.

[0047] As shown in Figures 4-6, the resistance detection structure includes a positioning plate 11 and a piezoelectric piece 12. The two ends of the positioning plate 11 are connected to the top plate 6 by a second screw (not shown), and the top plate 6 is connected to the gear box 4 through the positioning plate 11; an avoidance hole 13 is provided on the top plate 6, and a connecting portion 14 protrudes downward from the positioning plate 11, and the connecting portion 14 is arranged in the avoidance hole 13; a positioning column 15 protrudes upward from the gear box 4, and a positioning hole 16 is provided on the positioning plate 11 that passes through from top to bottom. There are two positioning columns 15, which are arranged diagonally on the gear box 4. There are four positioning holes 16. In the other two positioning holes 16, the positioning plate 11 is connected to the gear box 4 by a first screw (not shown); further, the bottom surface of the positioning plate 11 around the connecting portion 14 is thinned from top to bottom to form a stress concentration portion 17, and the piezoelectric piece 12 is pasted in sheet form near the stress concentration portion 17.

[0048] Resistance detection is performed through the combination of the positioning plate 11 and the piezoelectric piece 12. Compared with the top plate 6 of the lifting column 3 which requires higher rigidity, the positioning plate 11 is more adaptable to modification, such as increasing the design of deformation capacity, so that the piezoelectric piece 12 has a more sensitive resistance detection capability; the first screw is used for the transmission of the positioning plate 11 and the gear box 4. When resistance occurs, the positioning plate 11 is deformed due to the relative force exerted by the first screw on the positioning plate 11, and the piezoelectric piece 12 uses this to detect the resistance; the positioning column 15 can be used for the installation and positioning of the gear box 4 and the lifting column 3. The positioning column 15 is first inserted into the positioning hole 16 to realize the positioning of the gear box 4. After the positioning is completed, the gear box 4 is connected to the positioning plate 11 by the first screw to ensure the stability of the connection; the bottom surface of the positioning plate 11 around the connecting part 14 is thinned from bottom to top, and the thinned stress concentration part 17 has a stronger deformation capacity. The piezoelectric piece 12 is arranged on it, which makes the detection sensitivity higher.

[0049] Of course, the resistance detection structure can also be a piezoelectric piece 12, and the piezoelectric piece 12 can be directly pasted on the top plate 6. This method has a simple structure, is easy to install and has low cost. In this embodiment, the positioning plate 11 is an aluminum plate, which has a lower production cost and is more deformable than the top plate 6. Example

[0050] The difference between this embodiment and embodiment 1 lies in the different resistance detection structures.

[0051] Specifically, as shown in Figures 7-9, the resistance detection structure also includes an elastic sheet 18; a stepped portion 19 is formed on the positioning plate 11 around the second screw, and the stepped portion 19 includes a first step 191 and a second step 192. The diameter of the first step 191 is larger than that of the second step 192, and the height of the plane where the first step 191 is located is greater than the height of the plane where the second step 192 is located. The first step 191 and the second step 192 are arranged from the outside to the inside, and both the first step 191 and the second step 192 are annular, and a height difference is formed between the first step 191 and the second step 192; the elastic sheet 18 is arranged on the first step 191, and the piezoelectric sheet 12 is annularly adhered to the elastic sheet 18; the second screw passes through the elastic sheet 18 and the step portion 19 from top to bottom and is connected to the top plate 6; the height difference between the first step 191 and the second step 192 allows the elastic sheet 18 to have space for elastic deformation. When the desktop load increases, the elastic sheet 18 can bend downward and abut against the second step 192, thereby continuing to deform on the basis of the second step 192, which has the effect of preventing permanent creep of the elastic sheet 18; at the same time, the elastic sheet 18 can further increase the resistance detection sensitivity of the piezoelectric sheet 12.

Claims

1. A single-motor lift table with an resistance detection function, characterized in that: include: The motor is connected to the lifting columns on both sides through a transmission rod; A lifting column configured to be driven by a motor to perform telescopic movement; the lifting column includes a gear box, a screw assembly, and a top plate located on the top of the lifting column; The screw assembly is vertically arranged inside the lifting column, the screw assembly is connected to the gear box, and the screw assembly is configured to drive the lifting column to extend and retract; A gear box is disposed inside the lifting column and connected to the top plate. The gear box is respectively connected to the screw assembly and the motor. The gear box is configured to drive the top plate to move when the motor drives the screw assembly to move. The resistance detection structure is arranged on the top plate and is configured to detect the deformation amount on the top plate caused by the relative force between the top plate and the gear box, and to judge the resistance state.

2. The single-motor lift table with resistance detection function according to claim 1, characterized in that: The resistance detection structure includes a positioning plate and a piezoelectric piece. The positioning plate is installed on the top plate, the positioning plate is connected to the gear box, and the top plate and the gear box are connected through the positioning plate; the piezoelectric piece is arranged on the positioning plate.

3. The single-motor lift table with resistance detection function according to claim 2, characterized in that: An avoidance hole is opened in the middle of the top plate, and a connecting portion is protruded downwards on the positioning plate, and the connecting portion is arranged in the avoidance hole; the positioning plate is connected to the gear box by a first screw.

4. The single-motor lift table with resistance detection function according to claim 3, characterized in that: The positioning plate around the connection portion is thinned to form a stress concentration portion, and the piezoelectric piece is arranged on the stress concentration portion.

5. The single-motor lift table with resistance detection function according to claim 3, characterized in that: A positioning column is protruded upward on the gear box, a positioning hole is opened on the positioning plate and passes through the positioning column in the positioning hole, and the first screw is connected to the gear box through the positioning hole.

6. The single-motor lift table with resistance detection function according to claim 2, characterized in that: The two ends of the positioning plate are connected to the top plate through second screws.

7. The single-motor lift table with resistance detection function according to claim 6, characterized in that: A stepped portion is formed on the positioning plate around the second screw, and the stepped portion includes at least a first step and a second step. The diameter of the first step is larger than that of the second step, and the height of the plane where the first step is located is greater than the height of the plane where the second step is located.

8. The single-motor lift table with resistance detection function according to claim 7, characterized in that: The resistance detection structure also includes an elastic sheet, which is arranged on the first step, and the piezoelectric sheet is arranged on the elastic sheet; the second screw passes through the elastic sheet and the step from top to bottom and is connected to the top plate.

9. The single-motor lift table with resistance detection function according to claim 2, characterized in that: The positioning plate is an aluminum plate.

10. The single-motor lift table with resistance detection function according to claim 1, characterized in that: The resistance detection structure comprises a piezoelectric piece, and the piezoelectric piece is adhered and arranged on the top plate.

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