CN206923881U - A kind of Liftable type lectern - Google Patents

Abstract

The utility model belongs to the field of teaching supplies, in particular to a liftable lecture table, which includes a tabletop, and a first scissor-type lifting frame and a second scissor-type lifting frame for supporting the tabletop are arranged side by side under the tabletop. The first scissor-type crane The upper end of one side on the frame and the second scissor lift frame is hinged with the bottom of the desktop, and the upper end of the other side is a free end and is set in contact with the bottom of the desktop. On the first scissor lift frame and the second scissor lift frame The lower end of one side is fixed and hinged by a fixed hinge seat, and the other side is a free end; a driving mechanism is arranged between the first scissor lifting frame and the second scissor lifting frame, and the driving mechanism can drive the first scissor lifting frame and the second scissor lifting frame. The second scissor lift frame is extended or retracted synchronously, and the height of the desk can be adjusted to meet the needs of teachers of different heights.

Description

A liftable desk

【Technical field】

The utility model belongs to the field of teaching supplies, in particular to a liftable desk.

【Background technique】

So far, most of the desks used for teaching are traditional non-lifting desks, and no specific consideration has been given to the differences between teachers' heights, which cannot meet the needs of teachers of different heights. Due to the height of the desk, students sitting in the back row are likely to have their eyesight affected due to the angle, which will affect the efficiency of class.

【Content of utility model】

In order to solve the above problems, the purpose of this utility model is to provide a liftable desk, which can adjust the height of the desktop to meet the needs of teachers of different heights.

The purpose of this utility model is achieved through the following technical solutions:

A liftable lecture table, comprising a desktop, a first scissor lifting frame and a second scissor lifting frame for supporting the desktop are arranged side by side under the desktop, and a The upper end of one side is hinged with the bottom of the desktop, the upper end of the other side is a free end and is set in contact with the bottom of the desktop, the lower end of one side of the first scissor lift frame and the second scissor lift frame are fixed by a fixed hinge seat Hinged, the other side is a free end; a driving mechanism is arranged between the first scissor lifting frame and the second scissor lifting frame, and the driving mechanism can drive the first scissor lifting frame and the second scissor lifting frame to extend or contract synchronously .

The drive mechanism includes a first support rod, a second support rod and a leading screw and a motor for driving the leading screw to rotate, and the two ends of the first support rod and the second support rod are respectively connected with the first scissor crane frame and the second The two scissor-type crane frames are connected, the lead screw is connected with the first support rod in rotation, and is threadedly connected with the second support rod. Through the rotation of the lead screw, the first scissor-type crane frame and the second scissor-type crane frame can be driven to extend or contract synchronously .

The two ends of the first support rod are respectively connected with the two hinge seats at the lower end of the first scissor crane frame and the second scissor crane frame, and the two ends of the second support rod are respectively connected with the first scissor crane frame and the second scissor crane frame. The free end connection of the lower end of the two scissor crane frames.

A ball slideway is connected to the second support rod, and the ball slideway is fixedly arranged.

The motor is connected with the lead screw through a reducer, and the motor is connected with the reducer through a coupling.

The motor adopts a stepping motor, the stepping motor is connected with a stepping motor driver, the stepping motor driver is connected with a single-chip microcomputer control board, and the single-chip microcomputer control board is connected with a power supply module and a control button.

Both the free ends of the lower ends of the first scissor crane frame and the second scissor crane frame are provided with rollers.

The free ends of the upper ends of the first scissor crane frame and the second scissor crane frame are provided with rollers, and the rollers are in contact with the bottom of the desktop.

The first scissor lift frame and the second scissor lift frame are connected by a transverse connecting rod.

The bottoms of the first scissor crane frame and the second scissor crane frame are provided with a lectern base.

Compared with the prior art, the utility model has the following beneficial effects:

The liftable lectern of the present utility model is provided with the first scissor lifting frame and the second scissor lifting frame for supporting the desktop side by side under the desktop, between the first scissor lifting frame and the second scissor lifting frame A driving mechanism is provided, and the driving mechanism can drive the first scissor lift frame and the second scissor lift frame to extend or shrink synchronously, so that the desktop can be lifted and lowered. Therefore, the desk can adjust the height of the desktop to suit teachers of different heights. need.

Further, the second support rod is connected with a ball slideway, and the ball slideway is fixedly arranged, and the bottom of the first scissor lift frame and the second scissor lift frame can be guaranteed to slide directionally through the ball slideway, ensuring the smooth movement of the desktop when it is lifted. stability.

Further, the free ends of the lower ends of the first scissor crane frame and the second scissor crane frame are provided with rollers, and through the support and rolling action of the rollers, the first scissor crane frame and the second scissor crane frame are moved More stable and more flexible.

Further, the free ends of the upper ends of the first scissor crane frame and the second scissor crane frame are provided with rollers, and the rollers are in contact with the bottom of the desktop, and through the support and rolling action of the rollers, the distance between the desktop and the scissor crane frame is protected. The direct friction ensures the flexibility when the desktop is raised and lowered.

Further, the first scissor lift frame and the second scissor lift frame are connected by a horizontal connecting rod, and the connecting rod plays a role of stabilizing the connection, ensuring the stability of the desktop when it is raised and lowered.

Further, the bottoms of the first scissor crane frame and the second scissor crane frame are provided with a desk base, so the liftable desk of the utility model can be made into an integral structure, which is easy to move and install without damaging the classroom. ground.

【Description of drawings】

Fig. 1 is the left view of the liftable desk of the utility model;

Fig. 2 is the top view of the liftable desk of the utility model;

Fig. 3 is the electric motor operating principle circuit diagram of the utility model;

Fig. 4 is an enlarged view of part A in Fig. 3 (i.e. a power module diagram);

Fig. 5 is the enlarged view of part B in Fig. 3 (i.e. the control block diagram);

Figure 6 is an enlarged view of part C in Figure 3 (i.e. a stepping driver module diagram);

Fig. 7 is a circuit diagram of the operating principle when the motor is an ordinary motor.

Among them, 1-lecture table base, 2-first scissor lifting frame, 2-1-second scissor lifting frame, 3-turning pair, 4-roller, 5-desktop, 6-lead screw, 7-reducer , 8-motor, 9-side plate, 10-lifting side vertical plate, 11-pin, 12-ball slideway, 13-coupling, 14-control button, 15-connecting rod, 16-first support rod 16 -1-second support rod, 17-fixed hinge seat, 18-triangular plug, 19-filter, 20-switching power supply, 21-upper limit sensor, 22-initial position sensor, 23-lower limit sensor, 24-rise Switch, 25-drop switch, 26-reset switch.

【detailed description】

Below in conjunction with accompanying drawing, the utility model will be further described.

As shown in Figures 1-7, the liftable desk of the present utility model includes a desktop 5, and the first scissor crane frame 2 and the second scissor crane frame 2 for supporting the desktop 5 are arranged side by side under the desktop 5 -1, the bottom of the first scissor lift frame 2 and the second scissor lift frame 2-1 is provided with a desk base 1, and the first scissor lift frame 2 and the second scissor lift frame 2-1 pass through the horizontal The connecting rod 15 is connected, the upper end of the first scissor crane frame 2 and the second scissor crane frame 2-1 are hinged with the bottom of the desktop 5, and the upper end of the other side is a free end, and the free end is provided with Roller 4, roller 4 is in contact with the bottom of desktop 5, the lower end of one side on the first scissor lift frame 2 and the second scissor lift frame 2-1 is fixedly hinged by a fixed hinge seat 17, and the other side is a free end, All be provided with roller 4 at this free end; Be provided with drive mechanism between the first scissor lift frame 2 and the second scissor lift frame 2-1, drive mechanism can drive the first scissor lift frame 2 and the second scissor lift frame Crane frame 2-1 synchronously stretches or contracts; The used rollers of the utility model are plastic rollers.

As shown in Figures 1 and 2, the drive mechanism includes a first support rod 16, a second support rod 16-1, a lead screw 6 and a motor 8 for driving the lead screw 6 to rotate, and the motor 8 communicates with the lead screw through a reducer 7 6 connection, the motor 8 is connected with the reducer 7 through the coupling 13, the reducer 7 adopts a worm gear reducer, and the two ends of the first support rod 16 and the second support rod 16-1 are respectively connected with the first scissor crane frame 2 is connected with the second scissor crane frame 2-1, the lead screw 6 is rotationally connected with the first support rod 16, and is threadedly connected with the second support rod 16-1, and the first scissor crane can be driven by the rotation of the lead screw 6 The frame 2 and the second scissor crane frame 2-1 are extended or retracted synchronously.

As shown in Figure 2, in conjunction with Figure 1, the two ends of the first support rod 16 are respectively connected with the first scissor lift frame 2 and the two hinged seats 17 of the lower end of the second scissor lift frame 2-1, the second support Both ends of the rod 16-1 are respectively connected to the free ends of the lower ends of the first scissor lift frame 2 and the second scissor lift frame 2-1.

As shown in FIG. 2 , a ball slideway 12 is connected to the second support rod 16 - 1 , and the ball slideway 12 is fixedly arranged on the base 1 of the desk.

As shown in Fig. 3, Fig. 5 and 6, motor 8 adopts stepper motor, is connected with stepper motor driver on the stepper motor, is connected with single-chip microcomputer control board on the stepper motor driver, is connected with power supply module and control on the single-chip microcomputer control board button 14.

The motor of the present utility model adopts a stepping motor, and the positive and negative rotation of the motor is specifically controlled through a stepping motor driver and a control board. It is connected with the entire scissor lift mechanism, and the forward and reverse rotation of the stepping motor (controlled by the program programmed in the controller) drives the lead screw to move to realize the rise and fall of the entire table body. This design can be customized for teachers of different heights, reducing teacher fatigue to a certain extent.

The beneficial effect of the design is that the design has the advantages of novel structure, convenient operation, strong controllability and the like. It also realizes the full combination of machinery and electrical appliances. Through the stepping motor, the height of the desktop can be adjusted according to the needs to meet the needs of teachers of different heights. Compared with traditional desks, it is more humanized and free-spirited. By pressing the button to adjust the desktop to a suitable height, the teacher can work with a slight bow of the head, without fatigue.

Embodiment, with reference to accompanying drawing 1 and Fig. 2

The base 1 of the lecture table and the scissor crane frame (2, 2-1) play the main supporting role. The rotating pair 3 corresponds to the rods connected to the scissor mechanism on both sides. load, thereby reducing the local bearing pressure, the lead screw 6 is connected with the reducer 7, and is connected with the stepping motor of the power source through the coupling 13, and the stepping motor outputs power, which can control the fixed-point positioning and lifting of the entire scissor crane frame. Roller 4 connects scissors type crane frame, supports desktop above it, and respectively has a roller on both sides of desktop, therefore can realize the steady lifting of desktop.

specific:

Side plate 9 (equivalent to the desk shell of lecture table) is fixed on both sides of the table bottom plate, wherein the height of the table shell can satisfy the relatively short teacher's use without utilizing the lifting mechanism.

The first and second support rods are connected to the scissor mechanism with bolts. The first and second support rods are made of Fanggang Q235. Nails connect the two side panels 9; the two ends of the first and second scissor lift frames are connected with plastic rollers, and the top is connected to the table top; in order to ensure the aesthetic appearance during the ascent process, there are table lifting sidestands on both sides of the table top. plate 10. The table lifting side vertical plate 10 and the side plate 9 are connected by a ball slideway 12 .

Further, four synchronous connecting rods 15 are connected between the left and right scissor crane frames, which play a stabilizing role, so that the scissor crane frames on both sides can be lifted and lowered synchronously, which can greatly reduce the swing.

Further, for the power supply module, the stepper motor is connected to the stepper motor driver, the driver is connected to the controller, the stepper motor controller is connected to the control button 14, and the stepper motor controller and the control button are fixed on the right side of the desktop; The desktop can be raised and lowered by pressing the button, and the height of the desk can be adjusted by the individual.

Furthermore, the button for lifting height is on the right side of the desktop, close to the place where human hands can easily touch. A controller is fixed next to it, so that the administrator can input the program more conveniently. Pressing the button can make the teacher's operation more concise during class.

The advantages and positive effects of the utility model are: the lifting desk has a novel structure, is easy to operate, realizes the full combination of machinery and electrical appliances, and adjusts the height of the desktop according to needs through the stepping motor to suit teachers of different heights. According to the needs, adjust the desktop to a suitable height, and the teacher can work with just slightly bowing his head, and it is not easy to get tired.

As shown in Figures 4-6, combined with Figure 3, the electric control system used in the liftable desk of the present invention includes: a power supply module, a switch module, a sensor module, a single-chip microcomputer control board, a stepper motor driver and a stepper motor;

Wherein, the power supply module: the switching power supply is powered by an external 220V power supply after being filtered by a filter, and the switching power supply converts the 220V voltage into a 24V power supply to supply power to the single-chip microcomputer control board and the stepping motor driver;

Switch module: the switch module is used to control the rotation of the motor, and is electrically connected to the power supply module and the single-chip microcomputer control board respectively;

Single-chip microcomputer control board: used to receive the signal of the switch module and the sensor module and the signal of the output control stepper motor driver, respectively with the power module, the switch module, the sensor module and the stepper motor described in Fig. 4 and Fig. 5 driver electrical connection;

Sensor module: used to detect the position of the liftable desktop, electrically connected to the power supply module and the single-chip microcomputer control board respectively;

Stepper motor and its driver: used to receive the signal sent by the single-chip microcomputer control board and control the motion of the stepper motor, and electrically connected with the power supply module, the single-chip microcomputer control module and the motor respectively, the stepper The stepper motor is used to provide power for the liftable desktop, and is electrically connected with the stepper motor driver.

For convenience, the "power supply" mentioned below refers to the 24V power supply provided by the "power supply module", the "control board" described below refers to the "single-chip microcomputer control board", and the "driver" described below refers to The "stepping motor driver" and the "motor" mentioned below are referred to as the "stepping motor".

As shown in Figure 5 and Figure 6:

1. The OUT1 port of the control board is electrically connected to the EN- port of the driver, the OUT2 port of the control board is electrically connected to the DIR- of the driver, and the OUT3 of the control board is electrically connected to the PUL- of the driver. The ports EN+, DIR+, and PUL+ of the driver are all electrically connected to the 24v port of the power supply, the ports V+, V- of the driver are respectively electrically connected to the 24V and GND of the power supply, and the 24V and GND ports of the control board are respectively connected to the 24V port of the power supply. The 24V and GND ports of the above power supply are electrically connected;

2. The sensor module includes an upper limit sensor, an initial position sensor, and a lower limit sensor. The upper limit sensor, the initial position sensor, and the lower limit sensor are set on one side of the desktop, and are respectively set at the upper limit position, the initial position and the offline position of the desktop. When the desktop is lifted, the upper limit sensor, the initial position sensor and the lower limit sensor can detect the corresponding position of the desktop, and the sensor module is electrically connected with the power supply and the control board respectively; the upper limit sensor is used for Detect the highest position of the desktop rise, respectively connected to the 24V, GND of the power supply and the IN1 port of the control board; the initial position sensor is used to detect the initial position of the desktop, respectively connected to the 24V of the power supply, GND and the control The board IN2 is electrically connected; the lower limit sensor is used to detect the lowermost position of the desktop, and is electrically connected to the 24V, GND of the power supply and the IN3 port of the control board;

3. The switch module includes an up button switch, a down button switch and a reset button switch; the switches are electrically connected to the power supply and the control board respectively. The up button switch is used to raise the desktop, and is electrically connected to the GND of the power supply and the IN4 port of the control board; the down button switch is used to lower the desktop, and is connected to the GND of the power supply respectively. It is electrically connected to the control board IN5; the reset button switch is used to return the desktop to its initial position, and is electrically connected to the GND of the power supply and the control board IN6 respectively;

When the up button switch is pressed, the control board sends an electric signal to the driver, and the driver controls the motor to rotate clockwise; when the upper limit sensor senses a signal, the control board sends a control Signal to the driver to stop the motor. When the down button switch is pressed, the control board sends an electrical signal to the driver, and the driver controls the motor to rotate counterclockwise. When the lower limit sensor senses a signal, the control board sends a control Signal to the driver to stop the motor. When the reset button switch is pressed, the liftable desktop can automatically return to the initial position according to the program setting method.

As shown in Figure 7, the working conditions of a common DC motor are as follows: the power module supplies power to the switching power supply after being filtered by an external 220V power supply, and the switching power supply converts the 220V voltage into a 24V power supply to supply power to the DC motor. Among them, SB1 and SB2 are compound switches, respectively controlling the positive and negative rotation of the motor; KM1 and KM2 are contacts of the contactor, and the rectangular blocks KM1 and KM2 are coils of the contactor. When the up button KM1 is pressed, the motor rotates forward, and when the down button KM2 is pressed, the motor rotates in reverse, and then the height of the desktop is driven to be adjusted appropriately.

The specific working process of the liftable desk lifting of the utility model is as follows:

Three switch buttons are set on the desktop to control the rise, fall and reset of the desktop respectively;

When the up button switch is pressed, the control board sends an electric signal to the driver, and the driver controls the motor to rotate clockwise, and the motor will rise to the corresponding height according to the set step length until the teacher feels that it has risen to a suitable position; when raised to the highest and the upper limit sensor senses a signal, the control board sends a control signal to the driver to stop the motor;

When the down button switch is pressed, the control board sends an electrical signal to the driver, and the driver controls the motor to rotate counterclockwise. When the lower limit sensor senses a signal, the control board sends a control signal to the driver to stop the motor. change;

When the reset button switch is pressed, the liftable desktop can automatically return to the initial position according to the program setting mode.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (10)

1. A liftable desk is characterized in that it comprises a desktop (5), and the bottom of the desktop (5) is provided side by side with the first scissor crane frame (2) and the second scissor crane frame (2) for supporting the desktop (5). Crane frame (2-1), the upper end of one side on the first scissor type crane frame (2) and the second scissor type crane frame (2-1) is hinged with the bottom of desktop (5), and the upper end of the other side is The free end is arranged in contact with the bottom of the desktop (5), and the lower end of the upper side of the first scissor lift frame (2) and the second scissor lift frame (2-1) is fixedly hinged by a fixed hinge seat (17), The other side is a free end; a drive mechanism is arranged between the first scissor lift frame (2) and the second scissor lift frame (2-1), and the drive mechanism can drive the first scissor lift frame (2) and the second scissor lift frame (2-1). Two scissor crane frames (2-1) are extended or contracted synchronously. 2. A kind of liftable desk according to claim 1, characterized in that, the drive mechanism comprises a first support rod (16), a second support rod (16-1), a leading screw (6) and The motor (8) that is used to drive leading screw (6) to rotate, the two ends of first support rod (16) and the second support rod (16-1) all are connected with the first scissors crane frame (2) and the second respectively. The scissor crane frame (2-1) is connected, and the leading screw (6) is rotatably connected with the first support rod (16), and is threadedly connected with the second support rod (16-1). Through the rotation of the leading screw (6), it can The first scissor lift frame (2) and the second scissor lift frame (2-1) are driven to extend or contract synchronously. 3. A kind of liftable desk according to claim 2, characterized in that, the two ends of the first support rod (16) are respectively connected with the first scissor crane frame (2) and the second scissor crane Two hinge seats (17) at the lower end of the frame (2-1) are connected, and the two ends of the second support rod (16-1) are respectively connected with the first scissor lift frame (2) and the second scissor lift frame (2 -1) The free end connection of the lower end. 4. A liftable lectern according to claim 2, characterized in that a ball slideway (12) is connected to the second support rod (16-1), and the ball slideway (12) is fixedly arranged . 5. A liftable desk according to claim 2, characterized in that the motor (8) is connected to the lead screw (6) through a reducer (7), and the motor (8) is connected through a shaft coupling ( 13) Connect with reducer (7). 6. A kind of liftable desk according to claim 2, is characterized in that, described motor (8) adopts stepper motor, is connected with stepper motor driver on the stepper motor driver, is connected with stepper motor driver The single-chip microcomputer control board is connected with a power supply module, a sensor module and a control button (14) on the single-chip microcomputer control board. 7. A kind of liftable desk according to claim 1, is characterized in that, the free ends of described first scissor lift frame (2) and the lower end of second scissor lift frame (2-1) are both Wheels (4) are provided. 8. A kind of liftable desk according to claim 1, characterized in that, the free ends of the upper ends of the first scissor lift frame (2) and the second scissor lift frame (2-1) are set There are rollers (4), and the rollers (4) contact with the bottom of the desktop (5). 9. A liftable desk according to claim 1, characterized in that, the first scissor lift frame (2) and the second scissor lift frame (2-1) are connected through a horizontal Rod (15) is connected. 10. A kind of liftable desk according to claim 1, characterized in that, the bottoms of the first scissor lift frame (2) and the second scissor lift frame (2-1) are provided with a desk base (1).