KR101645812B1 - Electric Forklift - Google Patents

Abstract

The present invention relates to an electric forklift, and it is an object of the present invention to provide an electric forklift which is excellent in freedom of movement and rotation of a vehicle body frame in a limited space and can smoothly carry out unloading work in a limited space, Can be greatly improved.

Description

Electric Forklift

The present invention has an excellent degree of freedom of movement and rotation of a vehicle body frame in a limited space, so that it is possible to smoothly carry out unloading work in a limited space, and in this way, the work efficiency of the operator is greatly improved and the utilization of the limited space is also greatly improved The present invention relates to an electric forklift truck capable of being operated.

Generally, a forklift is a powered wagon that lifts and transports pallets for loading or loading on trucks. In particular, in the case of electric forklifts, there are many cases where unloading operations are performed in a limited space.

However, most forklifts, such as electric forklifts, have a low degree of freedom in the rotational direction and the moving direction in a limited space, so that the unloading operation can not be smoothly performed, resulting in a decrease in the work efficiency of the operator and a limited utilization of the space.

Domestic Public Utility Model Publication No. 1998-057530

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a vehicle cabin for a vehicle, which is excellent in freedom of movement and rotation of a vehicle body frame in a limited space, And an object of the present invention is to provide an electric forklift which can greatly improve the utilization of limited space and can greatly improve the efficiency.

In order to accomplish the above object, according to the present invention, A plurality of mechanic wheels axially fixed on both sides of the front and rear ends of the body frame, respectively; A plurality of wheel drive motors fixed to the vehicle body frame for rotating the plurality of mechanic wheels; A fork provided on the front side of the body frame so as to be movable up and down; A fork lifting / driving motor for lifting / lowering the fork; A battery for supplying power to the plurality of wheel drive motors and the fork lifting drive motor; An operating portion for operating the movement of the vehicle body frame and the elevation of the fork; And a control unit for controlling the plurality of wheel drive motors and the fork lifting drive motor according to an operation of the operation unit.

Here, it is preferable that the fork is rotated in the vertical direction to be folded.

The control unit and the control unit may be connected by wire or wirelessly.

Particularly, the operation unit and the control unit are connected by wireless communication, and the operation unit includes a touch screen capable of touch control, and the touch screen includes front and rear movement, diagonal movement, An operation button for raising and lowering the fork is preferably displayed.

Alternatively, the operation unit and the control unit are connected by wireless communication, and the operation unit is provided with a touch screen capable of touch control, a tilt sensor for sensing the inclination of the operation unit, and a direction sensor for sensing the rotation direction of the operation unit Wherein the touch screen includes a movement control button of the body frame and an elevation control button of the fork, and when the movement control button is touched to the operation unit, a detection signal of the tilt sensor and a detection signal of the direction sensor The control signal for forward and backward movement of the vehicle body frame and the left and right movement of the vehicle body frame and the rotation of the vehicle body frame in the in-situ state are output in response to the detection signal of the tilt sensor, And an operation control unit for outputting the output signal.

Further, it is preferable that a rear sensor is provided on the rear side of the vehicle body frame, and a warning member is provided on the vehicle body frame, the warning member being driven by the control of the control unit according to a detection signal of the rear sensor.

The vehicle body frame according to any one of claims 1 to 3, wherein the vehicle body frame is provided on both sides of the front and rear ends of the vehicle body frame such that the vehicle body frame is located at both sides of the front side of the vehicle body frame It is preferable that an object detecting unit for detecting an object on the ground is provided.

Preferably, the controller controls the rotational speeds of the plurality of mechanical wheels according to the height of the object sensed by the object sensing unit.

The present invention can smoothly move and rotate the vehicle body frame with the forks through a plurality of mechanically wound wheels fixed to both sides of the vehicle body frame on both sides of the vehicle body frame, Not only the degree of freedom is remarkably improved but also the unloading operation in the limited space can be performed smoothly, the work efficiency of the operator can be greatly improved and the utilization of the limited space can be greatly improved.

1 is a perspective view schematically showing an electric forklift, which is an embodiment of the present invention,
Fig. 2 is a side view of Fig. 1,
3 is a block diagram schematically showing a control state of the control unit,
4 is a block diagram schematically showing a state in which an operation unit and a control unit are connected wirelessly,
5 is a block diagram schematically showing an example of an operation unit,
6 is a plan view schematically showing an operation button displayed on a touch screen of an example operation unit,
7 is a block diagram schematically showing another example of the operation unit,
8 is a plan view schematically showing a movement control button and a lift control button displayed on a touch screen of an operation unit of another example,
9 and 10 are flow charts related to the operation of the movement control button,
11 is a flowchart related to the operation of the elevation control button of the fork,
12 is a block diagram schematically showing a rear detection sensor and a warning member,
Figs. 13 and 14 are partially enlarged side views schematically showing the object detection unit,
15 is a block diagram schematically showing a control state of a control unit according to a detection signal at an object detection unit.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. It is to be understood that the scope of the present invention is not limited to the following embodiments, and various modifications may be made by those skilled in the art without departing from the technical scope of the present invention.

FIG. 1 is a perspective view schematically showing an electric forklift according to an embodiment of the present invention, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a block diagram schematically showing a control state of the control unit.

1 to 3, the electric forklift according to an embodiment of the present invention includes a body frame 10, a plurality of mechanum wheels 20, a wheel drive motor 30, a fork 40, a fork lifting / 50, a battery 60, an operation unit 70, and a control unit 80. [

First of all, on the front side of the vehicle body frame 10, the left rear side and the rear side right side of the guide rod 101 formed on the left side of the front side of the vehicle body frame 10 and the front side of the front side of the vehicle body frame 10, And a lifting frame 110 for lifting and lowering along the guide bar 101 in a coupled state.

A chair part 102, on which a worker can sit, may be provided inside the body frame 10.

Next, a plurality of the above-mentioned mechananwels (20) are individually fixed to both sides of the lower front and rear ends of the vehicle body frame (10).

A plurality of the mechanum wheels 20 are fixed to the front lower left front side of the vehicle body frame 10 and the lower front front side of the vehicle body frame 10 respectively by a front left left mechanum wheel 201 and a front right rear mechanum wheel (202); A left rear mechanum wheel 203 and a rear right right mechanum wheel 204 axially fixed to the left rear end of the vehicle body frame 10 and the rear right rear end of the vehicle body frame 10 respectively have.

The plurality of the mechanic wheel 20 are divided into a plurality of roller units. The mechanic wheel 20 is well known in the Korean Patent Registration No. 10-0961692, A detailed description will be omitted.

A plurality of the wheel drive motors 30 are disposed on the lower side of the vehicle body frame 10 in a number corresponding to the number of the plurality of the mechanic wheel 20 so as to be positioned between the plurality of the mechanic wheel wheels 20. [ And a bolt is fixed to the upper surface in various manners such that the plurality of the mechanic wheels 20 are individually rotated.

The plurality of wheel drive motors 30 include an FL wheel drive motor 30a for rotating the front left left mechanan wheel 201; An FR wheel drive motor 30b for rotating the front right right mechanwheel wheel 202; A BL wheel driving motor 30c for rotating the rear left left mecha- nan wheel 203; And a BR wheel drive motor 30d for rotating the rear right mechanwheel wheel 204.

A torque transmission unit 310 may be further provided for transmitting the forward and reverse rotational forces of the plurality of wheel drive motors 30 to the plurality of the mechanic wheels 20.

The rotational force transmitting portion 310 includes a rotating body 311 coupled to a driving shaft of the plurality of wheel driving motors 30 and a plurality of the mechanic wheel 20, respectively; And a rotational force transmitting member 312 wound around the outer circumferential surface of the rotating body 311.

The rotating body 311 may be a pulley, a sprocket, or the like.

The rotational force transmitting member 312 may be a belt wound on the outer peripheral surface of the pulley, a chain wound around the outer peripheral surface of the sprocket, or the like.

The fork 40 is horizontally provided on the lower left side of the lifting frame 110 of the vehicle body frame 10 and the lower right side of the lifting frame 110, And is moved up and down along the lifting frame 110.

The fork 40 can be folded and rotated in the vertical direction of the body frame 10 by the operator in order to more easily store the body frame 10 even in a narrow place.

The rear side of the fork 40 opposite to the front side of the fork 40 may be fixed to the lower left side of the lifting frame 110 and the lower right side of the lifting frame 110, respectively.

Next, the fork lifting drive motor 50 moves up and down the fork 40 together with the lifting frame 110 of the body frame 10.

The fork lifting and lowering driving motor 50 may be vertically fixed to the upper portion of the front side of the vehicle body frame 10 in various ways such as bolt fixing.

A lead screw 501 may be provided on the lower side of the fork lifting drive motor 50 so as to be screwed vertically to the center of the rear surface of the lifting frame 110.

The fork 40 can be moved up and down together with the lifting frame 110 as the lead screw 501 is rotated in the forward and reverse directions by the fork lifting driving motor 50. [

The battery 60 is disposed below the vehicle body frame 10 so as to be positioned at a distance adjacent to the plurality of wheel drive motors 30 and is connected to a plurality of the wheel drive motors 30 and the fork lifting / (50).

The operating portion 70 is for manipulating the front and rear left and right, right and left movement of the vehicle body frame 10, diagonal movement and rotational movement in the inward position, and elevating and lowering of the fork 40. The chair portion 102 The mounting frame 130 may be vertically mounted on the lower front side of the vehicle body frame 10 so as to be positioned in the forward direction of the vehicle body frame 10.

The operation unit 70 may be composed of various types of terminals such as a smart phone and a smart pad so that the operator can easily move the portable terminal.

The control unit 80 is for controlling the plurality of wheel drive motors 30 and the fork lifting and driving motor 50 according to the operation of the operation unit 70. The control unit 80 is provided for the vehicle body frame 10, .

4 is a block diagram schematically showing a state in which an operation unit and a control unit are connected wirelessly.

Next, the operation unit 70 and the control unit 80 may be connected by wire through a wire or the like, but the present invention is not limited thereto. As shown in FIG. 4, the operation unit 70 and the control unit 80 may be connected by Bluetooth or Wi-Fi .

5 is a block diagram schematically showing an example of an operation unit.

5, when the operation unit 70 and the control unit 80 are connected by a wireless communication unit 710 such as Bluetooth or Wi-Fi, for example, the operation unit 70 includes a touch screen 720 ). ≪ / RTI >

The operation unit 70 includes an operation control unit 701 for outputting control signals related to diagonal movement of the body frame 10 in the front, rear, left, and right directions, rotation of the body frame 10, .

The operation unit 70 includes a memory 730 in which movement direction information on the diagonal movement direction of the vehicle body frame 10 in the forward, backward, left and right directions and the rotation direction thereof and movement information of the fork 40, .

Fig. 6 is a plan view schematically showing an operation button displayed on a touch screen of an example operation unit. Fig.

The touch screen 720 may display an operation button 90 for moving the body frame 10 forward and backward, left and right, diagonal and inward rotation, and for lifting and lowering the fork 40, have.

The operation button 90 includes a movement control button 910 of the body frame 10 displayed on the right side of the touch screen 720; And an elevation control button 920 of the fork 40 displayed on the left side of the touch screen 720.

The movement control button 910 may include a forward / backward left / right movement button 911, a diagonal movement button 912, a rotation button 913, and a stop button 914.

When the operator touches the forward button 911a, the backward button 911b, the leftward movement button 911c and the rightward movement button 911d among the forward, backward and leftward movement buttons 911, The moving direction information is extracted from the memory 730 and the operation control unit 701 outputs the moving direction information extracted by the control unit 80 so that the vehicle body frame 10 is moved forward and backward Backward, leftward, and rightward.

The operator may touch the first diagonal movement button 912a, the second diagonal movement button 912b, the third diagonal movement button 912c and the fourth diagonal movement button 912d The operation control unit 701 extracts the diagonal movement direction information from the memory 730 and the operation control unit 701 outputs the diagonal movement direction information extracted by the control unit 80 , So that the vehicle body frame 10 can be diagonally moved respectively on the left diagonal line, the right diagonal line, the left diagonal line, and the right diagonal line.

When the operator touches the first rotary button 913a and the second rotary button 913b among the rotary buttons 913, the operation control unit 701 receives the rotation direction information from the memory 730 The operation control unit 701 outputs the rotation direction information extracted by the control unit 80 so that the vehicle body frame 10 is rotated from its in-place to its left side and rotated from its in- It becomes movable.

The direction of rotation of the plurality of mechanic wheels 20 according to the touch of the movement control button 910 is shown in Table 1 below.

FL in the table 1 denotes the front left left mechanwheel 201, FR denotes the front right mechanike wheel 202, BL denotes the rear left left mecha- nance wheel 203, BR denotes the right rear mecha- .

Forward in Table 1 means that the mechananwheel 20 is rotated in the forward direction of the vehicle body frame 10 and Backward in Table 1 indicates that the mechanwheel wheel 20 is rotated in the vehicle body frame 10 10 in the direction of the arrow.

Direction of movement Mekanum  Wheel

FL

FR
BL
BR
↑

Forward
Forward
Forward
Forward
↓

Backward
Backward
Backward
Backward
←

Backward
Forward
Forward
Backward
→

Forward
Backward
Backward
Forward
↖

-
Forward
Forward
-
↗

Forward
-
-
Forward
↙

Backward
-
-
Backward
↘

-
Backward
Backward
-

Forward
Backward
Forward
Backward

Backward
Forward
Backward
Forward

When the operator touches the stop button 914, the operation control unit 701 outputs a stop signal of the body frame 10 to the control unit 80. Thus, the body frame 10 is stopped .

When the operator touches the elevation button 921 or the descending button 922, the operation control unit 701 displays the upward direction information and the upward direction information of the elevation information stored in the memory 730, The operation control unit 701 outputs the upward direction information and the downward direction information extracted by the control unit 80 so that the fork 40 can be raised and lowered .

7 is a block diagram schematically showing another example of the operation unit.

7, the operation unit 70 may be connected to the operation unit 70 via the wireless communication unit 710 such as Bluetooth or Wi-Fi. In this case, 701, the touch screen 720, the memory 730, the tilt sensor 740, and the direction sensor 750 may be provided.

The tilt sensor 740 may be provided on the operation unit 70 to sense a tilt of the operation unit 70 by an operator.

The direction sensor 750 may be provided on the operation unit 70 to sense the direction of rotation of the operation unit 70 by an operator.

The inclination sensor 740 may include a tilt sensing gyro sensor for sensing inclination of the front, rear, left, and right sides of the operation unit 70. The direction sensor 750 may include, for example, 70, but the present invention is not limited thereto. The gyrosensor may be any sensor capable of sensing the inclination and the rotational direction of the operation unit 70.

8 is a plan view schematically showing a movement control button and a lift control button displayed on a touch screen of an operation unit of another example.

8, a movement control button 910 of the body frame 10 can be displayed on the right side of the touch screen 720 of another example, and on the left side of the touch screen 720 of another example, The elevation control button 920 of the fork 40 can be displayed.

9 and 10 are flow charts related to the operation of the movement control button.

9, when the operator touches the movement control button 710 displayed on the right side of the touch screen 720 of the operation unit 70, the operator places the front side of the operation unit 70 on the operation unit The body frame 10 can be advanced by the control of the controller 80 when the inclination sensor 740 senses that the vehicle body frame 10 is tilted downward in a downward direction of the vehicle body frame 70.

When the worker touches the front side of the operation unit 70 to the upper side of the operation unit 70 while the operator touches the movement control button 710 displayed on the right side of the touch screen 720 of the operation unit 70, The tilting sensor 740 detects that the tilting of the vehicle body frame 10 is performed by tilting the vehicle body frame 10 upward.

When a worker touches the left side of the operation unit 70 to the left side of the operation unit 70 while the operator touches the movement control button 710 displayed on the right side of the touch screen 720 of the operation unit 70, The body frame 10 can be moved to the left by the control of the controller 80 when the tilt sensor 740 senses that the tilting downward tilts downward.

When a worker touches the movement control button 710 displayed on the right side of the touch screen 720 of the operation unit 70 with the operator touching the right side of the operation unit 70 with the right side of the operation unit 70 When the inclination sensor 740 senses that the vehicle body frame 10 is tilted downward in a downward direction, the body frame 10 can be moved to the right by the control of the controller 80.

10, when the operator touches the movement control button 710 displayed on the right side of the touch screen 720 of the operation unit 70, the operator places the operation unit 70 in place The body frame 10 rotates in a clockwise direction, that is, the right side of the body frame 10, under the control of the controller 80, .

When the operator touches the movement control button 710 displayed on the right side of the touch screen 720 of the operation unit 70 and the operator rotates the operation unit 70 in the counterclockwise direction The body frame 10 can be rotated in a counterclockwise direction, that is, leftward of the body frame 10 by the control of the controller 80. [

11 is a flowchart related to the operation of the elevation control button of the fork.

11, when the worker touches the elevation control button 920 of the fork 40 displayed on the left side of the touch screen 720 of the operation unit 70, The fork 40 can be elevated under the control of the controller 80 when the inclination sensor 740 senses that the front side of the fork 40 is tilted upwards toward the upper side of the operation unit 70. [

When the worker touches the elevation control button 920 of the fork 40 displayed on the left side of the touch screen 720 of the operation unit 70 by the operator pressing the front side of the operation unit 70 toward the operation unit 70 The fork 40 can be lowered under the control of the controller 80 when the tilt sensor 740 senses that the tilt sensor 740 tilts downward.

12 is a block diagram schematically showing a rear detection sensor and a warning member.

Next, as shown in FIG. 12, the rear detection sensor 100 and the warning member 200 may further be provided.

The rear detection sensor 100 may be provided on the rear side of the vehicle body frame 10 to detect an obstacle located in a rear direction of the vehicle body frame 10. [

The warning member 200 may be a speaker or a light emitting member provided on the body frame 10 to generate a beep or a light emitted from the body frame 10, have.

When the rear sensing sensor 100 detects an obstacle located in the rearward direction of the vehicle body frame 10, the speaker 80 outputs a warning sound such as a siren sound under the control of the controller 80, The light is emitted.

If the rear sensor 100 does not detect an obstacle located in the rearward direction of the vehicle body frame 10, the speaker and the light emitting member may be deactivated under the control of the controller 80.

FIG. 13 and FIG. 14 are partially enlarged side views schematically showing the object sensing unit, and FIG. 15 is a block diagram schematically showing a control state of the control unit according to a sensing signal at the object sensing unit.

Next, in order to prevent the vehicle body frame 10 from being collided with various kinds of objects placed on the ground to be damaged, so that the vehicle body frame 10 can run more safely, as shown in FIGS. 13 and 14 The body frame 10 may be provided with an object detection unit 300 including a contact type limit switch, a non-contact type proximity sensor, and the like.

The upper portion of the object detection sensor 300 may be provided on both sides of the front end of the vehicle body frame 10 and on the front side of the mechananwheel 20, To the both ends of the front end portion of the vehicle body frame 10 so as to be positioned in the direction of the vehicle body frame 10.

The upper portion of the object detection sensor 300 is disposed on both sides of the rear end of the vehicle body frame 10 so as to be positioned on the rear side of the mechanic wheel 20 provided on both sides of the rear end of the vehicle body frame 10. [ Respectively.

Although not shown in the drawing, a heavy object such as a weight can be provided on the lower side of the water detecting unit 300 so that the object detecting unit 300, which does not sense an object on the ground, can always maintain a vertical state .

The vehicle body frame 10 can be driven at a high speed under the control of the control unit 80 when the object detection unit 300 does not sense the object.

When the object detection unit 300 senses the object, the control unit 80 controls the speed of the vehicle body frame 10 to be lower than the speed at which the object 80 does not sense the object, can do.

Particularly, in order to allow the vehicle body frame 10 to travel more safely, the control unit 80 controls the rotation speeds of the plurality of the mechananwheels according to the height of the sensed object of the water detecting unit 300 It is better to control step by step.

For this purpose, on both sides of the front and rear ends of the body frame 10 to be located in the forward and backward directions of the water detecting sensor 300, a contact type sensor for measuring the height of the object sensed by the water detecting sensor 300, Or a non-contact type height measuring unit 320 may be provided.

The non-contact type height measuring unit 320 may include a magnetic force generating member (not shown) such as a magnet provided on the upper portion of the water detecting unit 300, ; An arc-shaped plate member 321 formed vertically symmetrically on both sides of the front and rear ends of the body frame 10 so as to be positioned in front and rear directions of the water detecting unit 300; And first and second magnetic force sensing units 322 and 323 formed of a magnetic sensor or the like provided at predetermined intervals on the plate member 321 in a circular arc shape.

As the height of the object increases, the magnetic force generating member (not shown) provided on the upper portion of the object detecting unit 300 gradually moves from the first magnetic force sensing unit 322 toward the second magnetic force sensing unit 323 The second magnetic force sensing unit 323 senses the magnetic force generating member (not shown) while rotating the vehicle body frame 10, and the vehicle body frame 10 can be driven at a low speed under the control of the control unit 80. [

As the height of the object decreases, the magnetic force generating member (not shown) provided on the upper portion of the object detection sensor 300 gradually moves from the second magnetic force sensing unit 323 toward the first magnetic force sensing unit 322 The first magnetic force sensing unit 322 senses the magnetic force generating member (not shown) while the second magnetic force sensing unit 322 is rotated. At this time, under the control of the control unit 80, The vehicle can be driven at a higher speed faster than when the driver 323 senses the magnetic force generating member (not shown).

The present invention constructed as described above is characterized in that the body frame 10 provided with the fork 40 through a plurality of the mechanic wheels 20 axially fixed on both sides of the front and rear ends of the body frame 10, The vehicle body frame 10 can be smoothly moved and rotated even in the limited space. Thus, the degree of freedom of movement and rotation of the vehicle body frame 10 is remarkably improved. Thus, unloading work in a limited space can be performed smoothly, There is an advantage that a great improvement and utilization of a limited space can be greatly improved.

10; A body frame, 20; Mecanum wheel,
30; Wheel drive motor, 40; fork,
50; Fork lift motor, 60; battery,
70; An operating portion 80; Control section.

Claims (8)

A vehicle body frame having a front elevation frame provided on a front side and a rear side detection sensor mounted on a rear side of the vehicle, the elevation frame being vertically movable along the guide rod in a state in which the left and right sides of the guide rod, and;
A plurality of mechanic wheels axially fixed on both sides of the front and rear ends of the body frame, respectively;
Wherein the front and rear ends of the vehicle body frame are disposed on both sides of the front and rear ends of the vehicle body frame so as to be positioned on both sides of the front side of the vehicle body frame, An object detecting unit that detects a ground object and is provided with a heavy object on the lower side so as to maintain a vertical state when an object on the ground is not detected;
A magnetic force generating member provided on both sides of the vehicle body frame so as to be positioned respectively in front and rear directions of the object sensing unit and provided on the object sensing unit for measuring the height of the object sensed by the object sensing unit; A height measurement unit configured by arc-shaped plate members formed on both sides of the front and rear ends of the vehicle body frame, and first and second magnetic force sensing units vertically provided at predetermined intervals in the plate member;
A warning member provided on the vehicle body frame;
A plurality of wheel drive motors fixed to the vehicle body frame for rotating the plurality of mechanic wheels;
A fork movable up and down on the front side of the vehicle body frame and having a rear side opposite to the front side so as to be folded and rotated in an up and down direction,
A fork lifting and lowering driving motor fixed to an upper portion of the front side of the vehicle body frame and having a lead screw threaded vertically to the lifting frame at a lower side to move the fork and the lifting frame up and down;
A battery for supplying power to the plurality of wheel drive motors and the fork lifting drive motor;
An operating portion for operating the movement of the vehicle body frame and the elevation of the fork;
And a controller for controlling the plurality of wheel driving motors and the fork lifting and driving motor in accordance with an operation of the operating unit to drive a warning member in accordance with a detection signal of the rear detection sensor, And a controller for controlling the rotational speeds of the plurality of the mechanic wheels in accordance with the height of the object,
The traveling speed of the vehicle body frame when the first magnetic force sensing unit senses the magnetic force generating member is faster than the traveling speed of the vehicle body frame when the second magnetic force sensing unit senses the magnetic force generating member,
Wherein the operation unit is provided with a touch screen capable of performing a touch control, a tilt sensor for detecting a tilt of the operation unit, and a direction sensor for sensing a rotation direction of the operation unit,
The touch screen includes a movement control button of the body frame and a lift control button of the fork,
And a controller for outputting a control signal for forward and backward movement of the vehicle body frame, a leftward and rightward movement of the vehicle body frame in response to a detection signal of the tilt sensor and a detection signal of the direction sensor, And an operation control unit for outputting a control signal for raising and lowering the fork in accordance with a detection signal of the tilt sensor when the elevation control button is touched. delete delete delete delete delete delete delete

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