CN114391716A

CN114391716A - Low-cost lift actuating system and contain its electronic lift table and lift speech table

Info

Publication number: CN114391716A
Application number: CN202210309260.1A
Authority: CN
Inventors: 刘涛; 朱更兴; 许金东
Original assignee: Changzhou Kaidi Electrical Co Ltd
Current assignee: Changzhou Kaidi Electrical Co Ltd
Priority date: 2022-03-28
Filing date: 2022-03-28
Publication date: 2022-04-26
Anticipated expiration: 2042-03-28
Also published as: CN114391716B

Abstract

The invention relates to a low-cost lifting driving system which comprises a hand controller, a power supply and a lifting upright post, wherein the lifting upright post comprises a motor, the power supply, the hand controller and the motor are electrically connected to form a control loop together, a restorable current limiting element is arranged on the control loop, the lifting upright post further comprises a screw rod, a sliding part, an inner pipe assembly and an outer pipe assembly, the inner pipe assembly and the outer pipe assembly are connected in a nested mode, the screw rod is provided with an upper limit assembly and a lower limit assembly, and the upper limit assembly and the lower limit assembly are respectively arranged on two sides of the sliding part. The invention also relates to an electric lifting table and an electric lecture table comprising the low-cost lifting driving system. The invention saves the traditional components such as travel switches for limiting up and down on the mechanism, saves the cost and simplifies the installation steps.

Description

Low-cost lift actuating system and contain its electronic lift table and lift speech table

Technical Field

The invention relates to the technical field of electric lifting tables, in particular to a low-cost lifting driving system, an electric lifting table comprising the low-cost lifting driving system and a lifting lecture table.

Background

At present, the office lifting table on the market mainly adopts two control modes in the aspect of journey: the first is a program control mode, the inner core of the program control mode calculates the stroke in the control box through the collection of Hall signals, thereby achieving the limiting effect of the upper position and the lower position; and the other is a travel switch control mode, and the scheme is that the travel switch is triggered by the up-and-down movement of the sliding block, so that the purpose of limiting is achieved.

However, the price of the program control mode is always high, especially the price of the current chip is high all the way, and the later maintenance cost of the program is also high; the control mode of the travel switch is relatively cheap in cost, but the requirements on the product are relatively high in structure, such as self-locking requirements of a motor, precision requirements of a travel bar and the like; at the same time, the assembly is complicated, since the position and the fastening of the travel switch determine the stability of the travel control.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the low-cost lifting driving system can meet the limit requirements of the upper position and the lower position.

The technical scheme adopted by the invention for solving the technical problems is as follows: a low-cost lifting driving system comprises a hand controller, a power supply and a lifting stand column, wherein the lifting stand column comprises a motor, a screw rod, a sliding part, an inner pipe assembly and an outer pipe assembly, the inner pipe assembly and the outer pipe assembly are connected in a nested manner, the screw rod and the sliding part slide relatively, the power supply, the hand controller and the motor are electrically connected to form a control loop together, and a restorable current-limiting element is arranged on the control loop;

the screw rod is provided with an upper limit component and a lower limit component; and the upper limit component and the lower limit component are provided with buffer mechanisms.

When the sliding piece contacts the upper limiting assembly or the lower limiting assembly, the motor enters a locked rotor state, the current of the control loop is suddenly increased, the restorable current limiting element reduces the increased current of the control loop to a safe current range within a certain time when the motor is in the locked rotor state, then the current is gradually reduced to zero, and at the moment, the control loop is in an open circuit state; when the restorable current limiting element is kept still for a certain time, the restorable current limiting element can restore the path, and at the moment, the hand controller is triggered to control the circuit to be conducted.

Further, the buffer mechanism comprises one or more shock absorption components, and the shock absorption components comprise shock absorption pads or cushion pads with different hardness, springs with elastic properties, disc springs or gaskets and the like.

Further, buffer gear includes two shock pads and is located the blotter between two shock pads, and the shock pad is last shock pad and lower shock pad respectively.

Further, buffer gear includes two shock pads and is located the spring between two shock pads, and the shock pad is last shock pad and lower shock pad respectively.

Furthermore, an anti-impact gasket is arranged above the upper limit position assembly and below the lower limit position assembly, and the anti-impact gasket is fixedly connected with the screw rod.

The anti-impact gasket is used for preventing the sliding part from exceeding the stroke in the operation process and playing a role in protection.

Further, the recoverable current limiting element may be a thermistor.

The current limiting element can be recovered to select the thermistor, the cost is low, and the realization is easy.

Still further, the recoverable flow limiting element may be mounted at any location on the control loop.

In the scheme, the current of the motor in normal operation and the current of the motor in locked rotor have larger difference, and the current in locked rotor can not cause irreversible damage to the motor in a short time.

When the sliding part contacts and extrudes the buffer mechanism, the motor is equivalent to be locked, the current passing through the motor is increased in a short time, at the moment, the restorable current limiting element can reduce the current of the control loop to a safe current range within a certain time, and then the current is gradually reduced to zero, the motor is locked in the short time, the motor cannot be damaged, the open circuit protection of the loop can be realized, and the response effect is obvious.

In addition, the lifting upright post further comprises a speed reducing mechanism, the motor can be connected with the speed reducing mechanism through a transmission connecting rod or not through the transmission connecting rod, and the output end of the speed reducing mechanism is connected with the screw rod.

The invention also provides an electric lifting table, which comprises a table plate, a foot plate, a supporting iron frame and the low-cost lifting driving system in the scheme, wherein one end of the lifting upright post is fixed on the table plate through the supporting iron frame, the other end of the lifting upright post is fixedly connected with the foot plate, the hand controller can be installed on the table plate, the motor is positioned at one side of the lifting upright post, and the motor is respectively connected with the speed reducing mechanisms of the lifting upright posts at the two ends of the transmission connecting rod through the transmission connecting rod.

The invention also provides a lifting lecture table, which comprises a table plate, a foot plate, a supporting iron frame and the low-cost lifting driving system in the scheme, wherein one end of the lifting upright post is fixed on the table plate through the supporting iron frame, the other end of the lifting upright post is fixedly connected with the foot plate, the hand controller is installed on the table plate, and the motor is installed inside the lifting upright post.

The invention has the beneficial effects that:

1. the current of the loop is increased in a short time and triggers the restorable current-limiting element by utilizing a loop where the motor is blocked and rotating, and the restorable current-limiting element and the buffer mechanism on the lead screw are utilized, and then the current is reduced to be zero step by step within a certain time, so that the motor cannot be damaged in a short-time heavy-current state, the circuit breaking protection of the loop can be realized, and the response effect is obvious;

2. the top and the bottom of the screw rod are respectively provided with an upper limit component and a lower limit component, the upper limit component and the lower limit component comprise buffer mechanisms, the buffer mechanisms can play a role in buffering when the sliding parts are contacted, and meanwhile, the resistance of the lifting upright column along the original telescopic direction is increased, so that the current of the motor is increased, and the protection effect of a restorable current limiting element can be caused;

3. the upper limit component and the lower limit component also comprise anti-impact gaskets, so that the over-stroke operation of the lifting stand column can be prevented, and a protection effect is achieved;

4. meanwhile, the material and installation steps of the travel switch are saved, and the problem of top jumping of the travel switch for controlling the travel under the condition that the motor is not self-locked in the prior art is synchronously solved;

5. the number of parts is reduced, the cost is reduced, the requirements on assembly personnel are reduced, and the assembly is more convenient and simpler.

Drawings

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.

Fig. 2 is a schematic diagram of the control circuit of fig. 1.

Fig. 3 is a current detection diagram according to the first embodiment of the present invention.

Fig. 4 is a schematic structural view of another multi-stage shock-absorbing structure of an upper limit component or a lower limit component in the first embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a second embodiment of the present invention.

Fig. 6 is a schematic structural diagram of a third embodiment of the present invention.

Fig. 7 is a schematic structural diagram of a fourth embodiment of the present invention.

In the figure: 1. the electric shock absorber comprises a motor, 2a hand controller, 3 a power supply, 4a lifting upright post, 5 a restorable current limiting element, 6 an inner pipe assembly, 7 an outer pipe assembly, 9 a table plate, 10 a foot plate, 11 a supporting iron frame, 12 a transmission connecting rod, 41 a sliding piece, 42 an upper limit assembly, 43 a lower limit assembly, 44 a gear box, 45 a screw rod, 400 a buffer pad, 401 an upper shock pad, 402 a lower shock pad and 403 an anti-impact pad.

Detailed Description

The invention will now be described in further detail with reference to the drawings and preferred embodiments. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

Example one

In the embodiment, a low-cost lifting driving system, as shown in fig. 1, includes a hand controller 2, a power supply 3 and a lifting column 4, the lifting column 4 includes a motor 1, a screw rod 45, a sliding member 41, an inner tube assembly 6 and an outer tube assembly 7, the inner tube assembly 6 and the outer tube assembly 7 are nested, an upper limit assembly 42 and a lower limit assembly 43 are disposed at two ends of the screw rod 45, the sliding member 41 is disposed on the screw rod 45 and can slide relative to the screw rod 45, and the sliding member 41 is disposed between the upper limit assembly 42 and the lower limit assembly 43, the lifting column 4 further includes a speed reducing mechanism which can be a gear box 44 speed reducing mechanism, the motor 1 is mounted outside the lifting column 4 and is connected to the gear box 44 through a transmission connecting rod 12 as an input end; the other end of the gear box 44 is connected to a screw 45 as an output.

The upper limit component 42 and the lower limit component 43 comprise a buffer mechanism, the buffer mechanism comprises two shock-absorbing pads and a buffer pad positioned between the two shock-absorbing pads, and the shock-absorbing pads are an upper shock-absorbing pad 401 and a lower shock-absorbing pad 402 respectively; the outer sides of the upper limit component 42 and the lower limit component 43 are provided with anti-impact gaskets 403 for protecting the lifting upright column 4 from exceeding the allowed travel range;

the motor 1, the hand controller 2 and the power supply 3 are electrically connected to form a control loop together, and the restorable current limiting element 5 is a thermistor and is arranged in the control loop.

As shown in fig. 1-2, when the slider 41 contacts the upper limit component 42 and starts to apply pressure to the upper limit component, the current of the control loop is increased at this time, so that the heat value of the recoverable current limiting element 5 is suddenly increased, and according to the characteristics of the recoverable current limiting element 5 (when an abnormal phenomenon such as overcurrent or overheat occurs in the circuit, the circuit is immediately cut off to play a role of protection, so as to prevent the fault from further expanding), the recoverable current limiting element 5 is caused to be disconnected, so as to achieve the purpose of upper limit, as shown in fig. 2 (a); when the slider 41 contacts the lower limit component 43 and starts to apply pressure to the lower limit component, the current of the control loop is increased, so that the heat value of the recoverable current limiting element 5 is suddenly increased, and the recoverable current limiting element 5 is broken, thereby achieving the purpose of lower limit, as shown in fig. 2 (b).

The motor 1 is normally locked for a period of time not longer than 5 seconds, since the current at the time of locking is usually several times the rated current, and a normal electric appliance triggers a protection mechanism at the time of locking. As shown in fig. 3, in this embodiment, the no-load operation current of the motor 1 is about 2A, the full-load operation current is about 4A, and the locked-rotor current is about 7-8A, and within 5 seconds, the restorable current-limiting element 5 can reduce the locked-rotor current of the motor 1 from about 7A to about 1A, and then becomes zero within 10 seconds. Because the locked rotor of the motor 1 is within the allowable time, and the current limiting element 5 can be recovered to trigger protection in time, the current of the motor 1 reaches a rated value, the motor 1 cannot be damaged, and the purpose of upper limit and lower limit can be achieved.

Example two

The difference between the second embodiment and the first embodiment is that: the buffer mechanism comprises two shock pads and a buffer pad 400, namely a spring, positioned between the two shock pads, and the spring has better and excellent buffer effect and good restorability; the shock pad is respectively upper shock pad 401 and lower shock pad 402, and the top of upper limit subassembly 42 and the below of lower limit subassembly 43 are provided with scour protection gasket 403, and scour protection gasket and lead screw fixed connection, as shown in fig. 4.

EXAMPLE III

As shown in fig. 5, a low-cost lifting driving system is different from the first and second embodiments in that a motor 1 is installed inside a lifting column 4, the upper end of a speed reducing mechanism is connected with the motor 1 as an input end, and the lower end is connected with a screw rod 45 as an output end.

Example four

As shown in fig. 6, an electric lifting table comprises a table plate 9, a foot plate 10, a supporting iron frame and a lifting upright post 4 in the first or second embodiment, wherein one end of the lifting upright post 4 is fixed with the table plate 9 through the supporting iron frame 11, the other end of the lifting upright post is fixedly connected with the foot plate 10, a hand controller 2 is installed on the table plate 9, and a motor 1 is installed on the outer side of the lifting upright post 4 and is connected with the input ends of gear boxes 44 on two sides through a transmission connecting rod 12. Wherein, the hand controller 2 is provided with an ascending key and a descending key.

The operation steps are as follows: triggering a rising key of the hand controller 2, rising the lifting upright post 4, when the lifting upright post rises to the maximum stroke, the sliding part 41 starts to compress the lower limiting component 43, and the current of the control loop is increased, so that the heat productivity of the restorable current limiting element 5 is suddenly increased, and according to the characteristics of the restorable current limiting element 5, the restorable current limiting element 5 is broken, so that the purpose of upper limiting is achieved; triggering the descending key of the hand controller 2, descending the lifting upright post, when the lifting upright post descends to the minimum stroke, the sliding part 41 starts to compress the upper limit component 42, and the current of the control loop is increased at the moment, so that the heat productivity of the restorable current limiting element 5 is suddenly increased, and the restorable current limiting element 5 is broken, thereby achieving the purpose of lower limit.

EXAMPLE five

As shown in fig. 7, a lifting lecture table comprises a table 9, a foot plate 10, a support iron frame 11 and a lifting upright post 4 in the third embodiment, wherein one end of the lifting upright post 4 is fixedly connected with the table 9 through the support iron frame 11, the other end of the lifting upright post is fixedly connected with the foot plate 10, a hand controller 2 is installed on the table 9, and a motor 1 is installed inside the lifting upright post 4.

In the above embodiment, the recoverable current limiting element 5 is a thermistor, and the recoverable current limiting element 5 may be mounted at any position in the control loop.

While particular embodiments of the present invention have been described in the foregoing specification, various modifications and alterations to the previously described embodiments will become apparent to those skilled in the art from this description without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a low-cost lift actuating system, includes hand controller (2), power (3) and lift stand (4), lift stand (4) include motor (1), lead screw (45), slider (41), inner tube subassembly (6) and outer tube subassembly (7) nested connection, lead screw (45) and slider (41) relative slip, power (3), hand controller (2) and motor (1) electrical connection constitute control circuit jointly, its characterized in that:

a restorable current limiting element (5) is arranged on the control loop;

an upper limit component (42) and a lower limit component (43) are arranged on the screw rod (45); the upper limiting component (42) and the lower limiting component (43) are provided with buffer mechanisms.

2. The low cost lift drive system of claim 1, wherein: the cushioning mechanism includes one or more cushioning components including cushions or pads of different hardness, springs with elastic properties, disc springs, or shims.

3. The low cost lift drive system of claim 2, wherein: the buffer mechanism comprises two shock pads and a buffer pad (400) positioned between the two shock pads, wherein the shock pads are an upper shock pad (401) and a lower shock pad (402) respectively.

4. The low cost lift drive system of claim 2, wherein: the buffer mechanism comprises two shock pads and a spring positioned between the two shock pads, and the shock pads are an upper shock pad (401) and a lower shock pad (402) respectively.

5. The low cost lift drive system of claim 1, wherein: the upper side of the upper limiting assembly (42) and the lower side of the lower limiting assembly (43) are provided with anti-impact gaskets (403), and the anti-impact gaskets (403) are fixedly connected with the screw rod (45).

6. The low cost lift drive system of claim 1, wherein: the restorable current limiting element (5) is a thermistor.

7. The low cost lift drive system of claim 6, wherein: the recoverable current limiting element (5) is arranged at any position of the control loop.

8. The low cost lift drive system of claim 1, wherein: the lifting upright post (4) further comprises a speed reducing mechanism, the motor (1) is connected with the speed reducing mechanism through a transmission connecting rod (12) or not through the transmission connecting rod (12), and the output end of the speed reducing mechanism is connected with the screw rod (45).

9. An electrically liftable table comprising a table top (9), a foot plate (10), a support iron (11) and a low cost lifting drive system according to any of claims 1-8, characterized in that: the utility model discloses a table, including table, hand controller (2), motor (1), table board (9), table board (10), the one end of lift stand (4) is fixed on table (9) through supporting iron stand (11), the other end and sole (10) fixed connection, the mountable of hand controller (2) is on table (9), motor (1) is located one side of lift stand (4), and motor (1) is connected with the reduction gears of transmission connecting rod (12) both ends lift stand (4) respectively through transmission connecting rod (12).

10. Elevating lecture table comprising a table plate (9), a foot plate (10), a support iron (11) and a low cost elevating drive system according to any one of claims 1-8, characterized in that: one end of the lifting upright post (4) is fixed on the table plate (9) through the supporting iron frame (11), the other end of the lifting upright post is fixedly connected with the foot plate (10), the hand controller (2) is installed on the table plate (9), and the motor (1) is installed inside the lifting upright post (4).