Lifting table capable of eliminating disturbance at two ends of transmission rod

Abstract

The lifting table capable of eliminating disturbance at the two ends of the transmission rod comprises a motor, the transmission rod, two stand columns arranged at intervals and a cross beam connected with the two stand columns and arranged between the two stand columns, and the transmission rod is also arranged between the two stand columns and is in transmission connection with transmission assemblies of the stand columns. The motor is mounted on the cross beam, is close to the middle of the cross beam, sleeves the transmission rod and is in transmission connection with the transmission rod; the flexible connecting pieces are arranged at the two ends of the transmission rod, the transmission rod and the transmission assembly are in transmission connection through the flexible connecting pieces, disturbance generated when the transmission rod rotates is released under the action of the flexible connecting pieces, and therefore the disturbance of the transmission rod cannot be transmitted to the transmission assembly and the stand column to form vibration and noise. Therefore, the accuracy of the resistance detection is improved, and the safety of a product and a user is ensured.

Description

Technical Field

[0001] The utility model relates to the field of furniture, in particular to a lifting table capable of eliminating disturbances at both ends of a transmission rod. 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] In a single-motor lift table, a resistance detection sensor is also provided. Generally, this sensor is installed on the lifting column and determines the resistance by detecting the change in the load on the table or column. However, in the prior art, the resistance detection accuracy of a single-motor lift table is poor. This problem is mainly due to the fact that the straightness of the transmission rod used to drive the two columns to rise and fall cannot be guaranteed. Specifically, the transmission rod is inserted into the gear box of the two lifting columns. Under ideal conditions, the transmission rod remains straight after being inserted into the gear box and is not subjected to radial forces. However, in reality, the interfaces of the two gear boxes cannot be 100% aligned. After the transmission rod is connected to the two gearboxes, it will be twisted due to the force applied. When the non-straight transmission rod rotates, the transmission rod will be twisted due to the tension and radial disturbance will occur. This disturbance will be further transmitted to the gearbox and the column, thereby generating noise and vibration. Since the sensing element is set on the column, the noise and vibration caused by the disturbance will interfere with the detection of the sensing element, thereby affecting the accuracy of the resistance detection and making the waveform output by the sensing element very unstable. When resistance occurs, it is impossible to make an accurate judgment, which further affects the user experience and even causes damage to the furniture and injury to the user. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, the utility model provides a lifting table that eliminates disturbances at both ends of a transmission rod, comprising a motor, a transmission rod, two columns arranged at intervals, and a crossbeam connected to the two columns and arranged between the two columns. The transmission rod is also arranged between the two columns and is transmission-connected to the transmission assembly of the columns. The motor is installed on the crossbeam and close to the middle of the crossbeam. The motor is sleeved on the transmission rod and is transmission-connected to the transmission rod. Flexible connectors are provided at both ends of the transmission rod. The transmission rod and the transmission assembly are transmission-connected through the flexible connectors and the disturbance generated when the transmission rod rotates is released under the action of the flexible connector. Therefore, the disturbance of the transmission rod will not be transmitted to the transmission assembly and the columns to form vibration and noise, and will not have an adverse effect on resistance detection, thereby improving the accuracy of resistance detection and ensuring the safety of the product and the user.

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

[0006] A lifting table that eliminates disturbances at both ends of a transmission rod comprises a motor, a transmission rod, two columns arranged at intervals, and a crossbeam connected to the two columns and disposed between the two columns, wherein the transmission rod is disposed between the two columns and located beside the crossbeam; the motor is mounted on the crossbeam, and in the left-right direction, the motor is located near the middle of the crossbeam, the motor is sleeved on the transmission rod and is transmission-connected to the transmission rod; the column comprises a transmission assembly, and flexible connectors are provided at both ends of the transmission rod, and the transmission rod and the transmission assembly are transmission-connected via the flexible connectors, and the flexible connectors are configured to flexibly connect the transmission rod and the transmission assembly and release disturbances generated when the transmission rod rotates.

[0007] In the solution, both ends of the transmission rod are flexibly connected to the transmission components of the two columns through flexible connectors. When the straightness requirement of the transmission rod cannot be met, the transmission rod rotates when driven by the motor, and the disturbance generated will be released at the flexible connectors at both ends. That is, in addition to driving the transmission component to move, the two ends of the transmission rod will also generate radial movement relative to the transmission component, and under the action of the flexible connector, the radial movement will not be restricted, and the disturbance of the transmission rod will not be transmitted to the transmission component and the column to form vibration and noise, and will not have an adverse effect on resistance detection, thereby improving the accuracy of resistance detection and ensuring the safety of the product and users.

[0008] The motor is installed on the crossbeam, and the motor drives the transmission rod to rotate. There is no need to consider whether the motor and the transmission rod are flexibly connected. That is, the above effect can be achieved by rigidly connecting the motor and the transmission rod. However, if the motor and the transmission rod are also flexibly connected, the effect of releasing disturbances and eliminating the adverse effects caused by disturbances can be further improved.

[0009] Preferably, the transmission assembly includes a gearbox, a connecting rod inserted into the gearbox, and the connecting rod has an outer end protruding from the surface of the column; the outer end of the connecting rod is connected to the flexible connector, and the outer end of the connecting rod is inserted into one end of the flexible connector, and the end of the transmission rod is inserted into the other end of the flexible connector. When consumers receive the lifting table, the connecting rod is already inserted into the gearbox, and the transmission rod only needs to be connected to the connecting rod, eliminating the need for complicated adjustments to align the interface of the gearbox, which facilitates installation for consumers and also facilitates the design of the flexible connection, without having to consider changing the complex gearbox structure.

[0010] Preferably, the flexible connector is a universal coupling. There are many types of universal couplings, but their functions are similar. The universal coupling allows the transmission rod to move radially after being connected to the transmission assembly, thereby acting as a flexible connector to eliminate transmission rod disturbances.

[0011] Preferably, the universal joint is a single cross universal joint, which is a relatively basic universal joint with a relatively simple structure and low cost.

[0012] Preferably, the flexible connection member is a flexible coupling.

[0013] Preferably, the flexible coupling comprises two coupling parts and a flexible body disposed between the two coupling parts. The transmission rod is plugged into one coupling part, and the transmission assembly is connected to the other coupling part. The coupling part has claws, and the flexible body has a plurality of grooves. The coupling part and the flexible body are connected to each other through a snap-fit engagement between the claws and the grooves. The two coupling parts are spaced apart and independently connect the transmission rod and the transmission assembly. The flexible body is elastic, allowing micro-motion between the two coupling parts, thereby eliminating the influence of transmission rod disturbance on resistance detection.

[0014] Preferably, the flexible connector is a flexible shaft. When the flexible connector is a flexible shaft, the same effect can be achieved, that is, the disturbance of the transmission rod is released and the influence on the resistance detection is eliminated.

[0015] Preferably, the transmission rod includes external spline sleeves at both ends, with at least 12 spline teeth. When consumers install and adjust the transmission rod after receiving the lifting table, the larger number of spline teeth allows the transmission rod to rotate at a smaller angle when the teeth are not engaged and need to be adjusted, compared to a structure with fewer spline teeth, facilitating assembly of the transmission rod.

[0016] Preferably, each column is provided with a sensing element for detecting resistance and retraction. The sensing element is used to detect resistance and retraction. A piezoelectric element is generally used as the sensing element. The sensing element will generate different waveforms due to changes in the load on the column. After removing the disturbance of the transmission rod, the waveform output by the sensing element can be made more stable, so that the sensing element can accurately judge when resistance actually occurs.

[0017] The design starting point, concept and beneficial effects of the utility model using the above technical solution are:

[0018] The motor is configured to drive the transmission rod to rotate, the transmission rod is configured to link the two columns to rise and fall synchronously, the transmission assembly is configured to drive the columns to rise and fall, the motor drives the transmission rod to rotate and then drives the transmission assembly to move, the transmission assembly will drive the two columns to rise and fall, and during the movement of the columns, resistance detection will be performed; however, when the transmission rod is connected to the transmission assembly, the straightness of the transmission rod cannot be guaranteed. In this case, the more costly method of increasing the installation accuracy to improve the straightness is abandoned, and the method of releasing the transmission rod disturbance is adopted to reduce vibration and noise, so as to reduce or eliminate the impact on the accuracy of resistance detection.

[0019] In the solution, both ends of the transmission rod are flexibly connected to the transmission components of the two columns through flexible connectors. When the straightness requirement of the transmission rod cannot be met, the transmission rod rotates when driven by the motor, and the disturbance generated will be released at the flexible connectors at both ends. That is, in addition to driving the transmission component to move, the two ends of the transmission rod will also generate radial movement relative to the transmission component, and under the action of the flexible connector, the radial movement will not be restricted, and the disturbance of the transmission rod will not be transmitted to the transmission component and the column to form vibration and noise, and will not have an adverse effect on resistance detection, thereby improving the accuracy of resistance detection and ensuring the safety of the product and users.

[0020] The motor is installed on the crossbeam, and the motor drives the transmission rod to rotate. There is no need to consider whether the motor and the transmission rod are flexibly connected. That is, the above effect can be achieved by rigidly connecting the motor and the transmission rod. However, if the motor and the transmission rod are also flexibly connected, the effect of releasing disturbances and eliminating the adverse effects caused by disturbances can be further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure of the lifting table in Example 1 of the present invention. Figure 1 ;

[0022] Figure 2 for Figure 1 A partial enlarged view of part A in the middle;

[0023] Figure 3 This is a schematic diagram of the three-dimensional structure of the lifting table in Example 1 of the present invention. Figure 2 ;

[0024] Figure 4 for Figure 3 A partial enlarged view of part B in the middle;

[0025] Figure 5 This is a front view of the lifting table after removing the outer tube shielding in Example 1 of the present invention;

[0026] Figure 6 This is a schematic diagram of the three-dimensional structure of the flexible coupling in Example 1 of the present utility model;

[0027] Figure 7 This is an exploded view of the flexible coupling in Example 1 of the present utility model;

[0028] Figure 8 This is a schematic diagram of the three-dimensional structure of the lifting table in Example 2 of the present utility model;

[0029] Figure 9 This is an exploded view of the output member, the flexible member, and the transmission wheel in Example 2 of the present utility model;

[0030] Figure 10 This is a schematic diagram of the three-dimensional structure of the flexible connection between the motor and the mounting plate in Example 3 of the present invention.

[0031] The figures are marked as follows: motor 1; output end 101; transmission rod 2; column 3; inner tube 31; outer tube 32; induction element 4; gear box 5; connecting rod 6; flexible connector 7; flexible member 8; output member 9; transmission wheel 10; first latching tooth 11; second latching groove 12; first latching groove 13; second latching tooth 14; coupling portion 15; flexible body 16; claw portion 17; groove 18; external spline sleeve 19; crossbeam 20; mounting plate 21; avoidance hole 22; flexible seat 23; flexible connection portion 231; main body 232; mounting hole 24. DETAILED DESCRIPTION

[0032] In order to more clearly understand the above-mentioned objectives, 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 the embodiments of the present application and the features therein can be combined with each other without conflict.

[0033] 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.

[0034] In the description of the present invention, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0035] The specific implementation of the utility model is as follows: Example

[0036] like Figure 1 As shown, the utility model provides a lifting table that eliminates disturbances at both ends of a transmission rod, comprising a motor 1, a transmission rod 2, two columns 3 arranged at intervals, and a beam 20 connected to the two columns 3 and arranged between the two columns 3, the transmission rod 2 is arranged between the two columns 3 and located beside the beam 20; the motor 1 is installed on the beam 20, and in the left and right directions, the motor 1 is located near the middle of the beam 20, the motor 1 is sleeved on the transmission rod 2 and is transmission-connected to the transmission rod 2; the column 3 includes a transmission assembly, and flexible connectors 7 are provided at both ends of the transmission rod 2, the transmission rod 2 and the transmission assembly are transmission-connected via the flexible connector 7, and the flexible connector 7 is configured to flexibly connect the transmission rod 2 to the transmission assembly and release the disturbance generated when the transmission rod 2 rotates.

[0037] The motor 1 is configured to drive the transmission rod 2 to rotate, the transmission rod 2 is configured to link the two columns 3 to rise and fall synchronously, and the transmission assembly is configured to drive the columns 3 to rise and fall. The motor 1 drives the transmission rod 2 to rotate and then drives the transmission assembly to move. The transmission assembly will drive the two columns 3 to rise and fall. During the movement of the columns 3, resistance detection will be performed; however, when the transmission rod 2 is connected to the transmission assembly, the straightness of the transmission rod 2 cannot be guaranteed. In this case, the more costly method of increasing the installation accuracy to improve the straightness is abandoned, and the method of releasing the disturbance of the transmission rod 2 is adopted to reduce vibration and noise, so as to reduce or eliminate the impact on the accuracy of resistance detection.

[0038] In the scheme, both ends of the transmission rod 2 are flexibly connected to the transmission components of the two columns 3 through flexible connectors 7. When the straightness requirement of the transmission rod 2 cannot be met, the transmission rod 2 rotates when driven by the motor 1, and the disturbance generated will be released at the flexible connectors 7 at both ends. That is, in addition to driving the transmission component to move, the two ends of the transmission rod 2 will also generate radial movement relative to the transmission component, and under the action of the flexible connector 7, the radial movement will not be restricted, and the disturbance of the transmission rod 2 will not be transmitted to the transmission component and the column 3 to form vibration and noise, and will not have an adverse effect on the resistance detection, thereby improving the accuracy of the resistance detection and ensuring the safety of the product and the user.

[0039] The motor 1 is mounted on the crossbeam 20 and functions to drive the transmission rod 2 to rotate. This effect can be achieved by rigidly connecting the motor 1 and the transmission rod 2, regardless of whether the motor 1 and the transmission rod 2 are flexibly connected. However, if the motor 1 and the transmission rod 2 are also flexibly connected, the effect of releasing disturbances and eliminating the adverse effects of disturbances can be further enhanced. In this embodiment, the motor 1 and the transmission rod 2 are rigidly connected. Of course, the motor 1 can also be flexibly connected to the transmission rod 2 by an internal flexible member.

[0040] Specifically, if Figure 1-5As shown, the column 3 includes an inner tube 31 and an outer tube 32. The outer tube 32 is sleeved on the inner tube 31. The inner tube 31 is connected to the table legs of the lifting table. A sensing element 4 is provided on the upper end plate of the outer tube 32. The sensing element 4 is used to detect resistance and retreat. Generally, a piezoelectric sheet is used as the sensing element 4. The sensing element 4 will generate different waveforms due to the load changes on the column 3. After removing the disturbance of the transmission rod 2, the waveform output by the sensing element 4 can be made more stable, so that when resistance actually occurs, the sensing element 4 can accurately make a judgment. The transmission assembly includes a gear box 5 and a linear push rod. The linear push rod is vertically arranged on the column. 3, the gear box 5 is arranged at the upper end of the linear push rod and is connected to the linear push rod in a transmission manner; the gear box 5 is connected to the upper end plate of the outer tube 32, and the linear push rod is connected to the inner tube 31. The linear push rod is a screw-nut assembly. When the linear push rod is working, it drives the inner tube 31 and the outer tube 32 to extend and retract, thereby causing the column 3 to rise and fall; the crossbeam 20 includes a mounting plate 21 perpendicular to the transmission rod 2, and the motor 1 is mounted on the mounting plate 21; an avoidance hole 22 is opened on the mounting plate 21, and the transmission rod 2 passes through the avoidance hole 22. The diameter of the avoidance hole 22 is larger than the diameter of the transmission rod 2, and the avoidance hole 22 is used to avoid the transmission rod 2 when disturbance occurs.

[0041] A connecting rod 6 is inserted into the gear box 5, and the connecting rod 6 has an outer end protruding from the surface of the column 3; the outer end of the connecting rod 6 is connected to the flexible connector 7, and the outer end of the connecting rod 6 is inserted in one end of the flexible connector 7, and the end of the transmission rod 2 is inserted in the other end of the flexible connector 7; when the consumer receives the lifting table, the connecting rod 6 has been inserted into the gear box 5, and the transmission rod 2 only needs to be connected to the connecting rod 6, and there is no need to perform complicated adjustments to align the interface of the gear box 5, which is convenient for consumers to install, and also facilitates the design of the flexible connection, without having to consider changing the complex structure of the gear box 5.

[0042] The outer end of the connecting rod 6 and the end of the transmission rod 2 are both connected to the flexible connector 7 through splines. Specifically, the transmission rod 2 includes an external spline sleeve 19 at its two ends, and the flexible connector 7 is provided with an internal spline; wherein the number of spline teeth is at least 12. Generally speaking, the number of spline teeth at the end of the transmission rod 2 is generally 6, and the present solution increases the number of spline teeth, so that the number of spline teeth reaches 12 or even 18; after the consumer receives the lifting table, when installing and adjusting the transmission rod 2, due to the large number of spline teeth, compared with the structure with a smaller number of spline teeth, when the teeth are not engaged and need to be adjusted, the rotation angle of the transmission rod 2 is smaller, which facilitates the assembly of the transmission rod 2.

[0043] There are many options for the flexible connector 7, which may be a flexible shaft, a flexible coupling or a universal coupling; Figure 6 、 7As shown, the flexible coupling is a coupling with a flexible body 16 built in. The shafts connected on both sides can produce slight relative motion, and do not lock the two shafts in radial direction like a rigid coupling; the flexible coupling includes two coupling parts 15 and a flexible body 16 arranged between the two coupling parts 15, the transmission rod 2 is plugged into one of the coupling parts 15, and the transmission assembly is connected to the other coupling part 15; the coupling part 15 has a claw part 17, and the flexible body 16 has a plurality of grooves 18, and the coupling part 15 and the flexible body 16 are connected in transmission by the snap fit between the claw part 17 and the groove 18; the two coupling parts 15 are arranged at intervals, and are respectively connected to the transmission rod 2 and the transmission assembly, and the flexible body 16 is elastic, so that micro-motion can be generated between the two coupling parts 15, thereby eliminating the influence of the disturbance of the transmission rod 2 on the resistance detection.

[0044] like Figure 2 、 5 As shown, there are many types of universal couplings, but their functions are similar. The universal coupling allows the transmission rod 2 to still move in the radial direction after being connected to the transmission assembly, thereby serving as a flexible connection 7 to eliminate the disturbance of the transmission rod 2. In this embodiment, a universal coupling is used as the flexible connection 7, and specifically a single cross universal joint. The single cross universal joint is a more basic universal coupling with a relatively simple structure and low cost.

[0045] Example 2: The only difference between this example and Example 1 is that the motor 1 and the transmission rod 2 are flexibly connected; specifically:

[0046] like Figure 8 、 9As shown, the motor 1 includes a flexible member 8 arranged inside the motor 1, and the flexible member 8 is configured to release the disturbance generated when the transmission rod 2 rotates; the motor 1 has an output end 101, and the output end 101 is provided with an output member 9 that drives the transmission rod 2 to rotate and a transmission wheel 10 that drives the output member 9 to rotate, and the flexible member 8 is arranged between the transmission wheel 10 and the output member 9, and the output member 9 is sleeved on the transmission rod 2; the motor 1 is configured so that the rotation of the transmission wheel 10 drives the flexible member 8 to rotate, the flexible member 8 drives the output member 9 to rotate, and the output member 9 drives the transmission rod 2 to rotate; by arranging the flexible member 8 between the output member 9 and the transmission wheel 10, a flexible connection between the transmission rod 2 and the motor 1 is achieved; the flexible member 8 has a first latching tooth 11 And the second slot 12, the transmission wheel 10 has a first slot 13, the output member 9 has a second tooth 14, the first tooth 11 is clamped in the first slot 13, and the second tooth 14 is clamped in the second slot 12; the transmission between the transmission wheel 10, the flexible member 8 and the transmission wheel 10 is realized by the tooth slot, the number of the first teeth 11 is 6, and the number of the second teeth 14, the first slot 13 and the second slot 12 are all 6, so as to realize more stable transmission; the flexible member 8 is soft rubber; the flexible member 8 is elastic, and the flexible connection between the transmission rod 2 and the motor 1 is realized by arranging soft rubber in the motor 1, which can also provide the effect of shock absorption and energy absorption.

[0047] Example 3: The only difference between this example and Example 2 is that the motor 1 and the mounting plate 21 are flexibly connected; specifically:

[0048] like Figure 10 As shown, a flexible seat 23 is provided on the motor 1, one end of the flexible seat 23 is inserted in the motor 1, and the other end of the flexible seat 23 is in contact with the mounting plate 21, and the motor 1 is softly connected to the mounting plate 21 through the flexible seat 23; further, two centrally symmetrical mounting holes 24 are provided on the motor 1, and the flexible seat 23 has a flexible connecting portion 231 and a main body 232, the flexible connecting portion 231 is inserted in the mounting hole 24, the main body 232 protrudes from the surface of the motor 1, and the main body 232 is in contact with the mounting plate 21; the flexible seat 23 is elastic, and the motor 1 and the crossbeam 20 are also flexibly connected, which not only further reduces the transmission of disturbances of the transmission rod 2, but also reduces vibration and noise for the motor 1 itself; finally, screws are installed in the flexible seat 23 to mount the motor 1 on the mounting plate 21.

Claims

1. A lifting table that eliminates disturbances at both ends of a transmission rod, characterized by: It includes a motor, a transmission rod, two columns arranged at intervals, and a crossbeam connected to the two columns and arranged between the two columns. The transmission rod is arranged between the two columns and is located beside the crossbeam; the motor is installed on the crossbeam, and in the left and right directions, the motor is located near the middle of the crossbeam. The motor is sleeved on the transmission rod and is connected to the transmission rod; the column includes a transmission assembly, and flexible connectors are provided at both ends of the transmission rod. The transmission rod and the transmission assembly are connected through the flexible connector. The flexible connector is configured to flexibly connect the transmission rod and the transmission assembly and release the disturbance generated when the transmission rod rotates.

2. The lifting table with disturbance elimination at both ends of the transmission rod according to claim 1, characterized in that: The transmission assembly includes a gearbox, on which a connecting rod is inserted, the connecting rod having an outer end protruding from the surface of the column; the outer end of the connecting rod is connected to the flexible connector, and the outer end of the connecting rod is inserted in one end of the flexible connector, and the end of the transmission rod is inserted in the other end of the flexible connector.

3. The lifting table with disturbance elimination at both ends of the transmission rod according to claim 1, characterized in that: The flexible connection is a universal coupling.

4. The lifting table with disturbance elimination at both ends of the transmission rod according to claim 3, characterized in that: The universal joint is a single cross universal joint.

5. The lifting table with disturbance elimination at both ends of the transmission rod according to claim 1, characterized in that: The flexible connection is a flexible coupling.

6. The lifting table with disturbance elimination at both ends of the transmission rod according to claim 5, characterized in that: The flexible coupling includes two coupling parts and a flexible body arranged between the two coupling parts. The transmission rod is plugged into one of the coupling parts, and the transmission assembly is connected to the other coupling part. The coupling part has a claw part, and the flexible body has several grooves. The coupling part and the flexible body are transmission connected through the snap fit between the claw part and the groove.

7. The lifting table with disturbance elimination at both ends of the transmission rod according to claim 1, characterized in that: The flexible connecting piece is a soft shaft.

8. The lifting table with disturbance elimination at both ends of the transmission rod according to claim 1, characterized in that: The transmission rod includes an external spline sleeve located at both ends thereof, and the number of spline teeth is at least 12.

9. The lifting table with disturbance elimination at both ends of the transmission rod according to claim 1, characterized in that: Each column is provided with a sensing element for detecting resistance and retreating.

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