JP2003206098A - Working carriage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem of a conventional working carriage of a type driving a machine body while driving traveling wheels by an electric motor, allowing a worker to get on the liftable working stand and to work on an elevated place, and frequently having a friction brake stopped by applying a brake in stopping of the motor, wherein, in particular, the motor is possibly broken by an excessive inertia load applied thereon and the elevated-place worker has a risk of impeding the stability of a machine body by an abrupt stop. <P>SOLUTION: This working carriage is provided with the liftable working stand allowing the worker to get on for working and constituted to drive the traveling wheels by the electric motor. This working carriage is characterized in that, when the electric motor is stopped, this carriage is constituted to stop by a resistance applied to inertia rotation of the motor by a regenerative brake circuit having the resistance between the both terminals of the motor. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work truck that facilitates work in high places.

[0002]

2. Description of the Related Art Conventionally, there has been known a work trolley of a system in which traveling wheels are driven by an electric motor to propel a machine body and a worker rides on a workbench capable of ascending and descending to work at a high place. There is.
Further, some of the electric motors are equipped with a friction type brake for stopping by applying a brake when the motor is stopped.

[0003]

SUMMARY OF THE INVENTION Such friction blur
When using a motor with a key, the motor may be damaged due to excessive inertial load, and it may stop suddenly, impairing the stability of the machine, and for workers at high altitudes. There was a problem with danger.

According to the present invention, a regenerative brake is used as a brake when the work carriage is driven by an electric motor and is stopped.
The above problem is solved by using a circuit.

[0005]

The present invention takes the following technical means in order to solve the above problems. That is,
The present invention as set forth in claim 1 is a work carriage provided with a worktable which can be moved up and down by a worker to board and work, wherein the traveling wheels are driven by an electric motor, and the electric motor is stopped. At this time, the regenerative brake circuit having a resistor between both terminals of the motor is configured to stand still by imparting resistance to the inertial rotation of the motor.

When the foot switch is turned on during traveling, the traveling wheels are driven by the starting rotation of the traveling electric motor to propel the work carriage. When the vehicle is stopped, the regenerative brake circuit operates by turning off the foot switch, and resistance is imparted to the inertial rotation of the motor to stop the vehicle. Therefore, unlike a friction type brake, it does not stop suddenly and is safe even when working in high places.

According to a second aspect of the present invention, in the first aspect, the regenerative brake circuit is switched between a state in which the regenerative brake circuit works and a state in which the regenerative break circuit does not work when the electric motor is stopped. It is characterized in that means are provided. When it is desired to move the work cart by hand, the brake state can be released by switching the regenerative brake circuit to a state in which it does not work, and manual movement can be performed.

[0008]

In summary, according to the invention of claim 1, when the running motor is stopped, it can be stopped by applying a resistance to the inertial rotation of the motor, which is different from the friction type brake. It does not stop at any time and is safe even when working in high places.

According to the second aspect of the invention, when it is desired to move the trolley by hand, the regenerative brake circuit of the motor can be switched to a state in which it does not work. Easy to move and easy to move.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to the drawings. 1 and 2 show a work carriage, in which a pair of left and right front traveling wheels 2, 2 and rear traveling wheels 3, 3 as traveling wheels are installed in front of and behind the vehicle body 1. An operation box 4 is erected high upward at the front part of the vehicle body. A workbench 5 on which a worker boards and works is erected so as to be able to move up and down with respect to the vehicle body 1 via an elevating link mechanism 6. Then, the lifting and lowering of the workbench is performed by the lifting and lowering electric motor M.
It is configured to be raised and lowered to an arbitrary vertical position by forward and reverse driving by switching operation of the raising and lowering switch 7 of 1. The workbench 5 is provided with upper and lower limit switches LS1 and LS2 to prevent the workbench from overshooting.

The front and rear traveling wheels 2, 2 and 3, 3 are
It runs along the water supply (liquid) pipes 8, 8 laid in the greenhouse house. The traveling of the vehicle body 1 is performed by driving the traveling electric motor M2.
The front traveling wheels 2 and 2 are driven via an internal power transmission device and the like so that the vehicle can travel.

A handrail rod 1 is provided on each of the left and right ends of the workbench 5.
0 is projected. As shown in the circuit diagram of FIG. 3, the traveling electric motor M2 is operated by turning on the traveling foot switch 11 when the motor is rotationally driven.
It is driven by rotation through the motor 2 and when the motor is stopped, the foot switch 11 is turned off to provide a resistor 13 between both terminals of the motor M2. A resistance is applied to the inertial rotation of the motor through the motor to stop the motor.

In the regenerative brake circuit, there is provided a changeover brake switch 15 for switching the regenerative brake circuit to a functioning state or a non-functioning state so that the work carriage can be lightly moved by hand. It is provided. Therefore, if the change-over brake switch 14 is switched to a state in which the regenerative brake circuit does not function, the dolly can be moved lightly even by pushing by releasing the brake.

In the figure, reference numeral 16 is a forward / reverse switch, and the forward and reverse movements of the motor M2 are such that the trolley moves forward when the switch is turned on by operating it to the front side, and the reverse drive when it is turned on by operating it to the rear side. It is configured to be driven. Figure 4,
The embodiment shown in FIG. 5 will be described. When the worker is on the work table at a high position of the dolly, if the trolley is moved forward and backward at high speed, the dolly may fall. Therefore, in order to prevent this fall, the work carriage is provided with a low-speed forward / reverse switch 1 in addition to a traveling foot switch 11 that moves forward / backward at a relatively high speed.
7 is provided. In short, the workbench 5 has limit switches LS1, L for restricting the upper and lower limit positions of the workbench.
S2 is provided, but this lower limit switch L
By interlocking S2, the low-speed forward / reverse switch 17 and the traveling foot switch 11 with each other, for example,
The traveling foot switch 11 is the lower limit switch LS2.
The lower limit switch L should be activated only when is on (when the workbench is lowered to the lower limit position).
Low speed forward / reverse switch 1 when S2 is not turned on
Only 7 can be used. That is, unless the workbench 5 is lowered to the lowest position, normal forward / backward movement cannot be performed, and when the workbench is at a high position, forward / backward movement can be performed only at a low speed. Therefore, when the workbench is higher than the lower limit position, the workbench can travel only at a low speed, so that the trolley can be prevented from accidentally falling and can be prevented in advance, which is safe.

In the embodiment shown in FIG. 6, when the traveling foot switch 11 is turned off when the traveling of the carriage is stopped, the traveling electric motor M2 is stopped. The brake on / off switch 18 is turned on after a lapse of a certain time, and the brake B is operated to brake.

The embodiment shown in FIG. 7 shows a plant stem attracting device which can be operated in a low position. This type of stem attracting device is used for cultivating vine plants P such as tomatoes and cucumbers, in which a stem extending from a medium according to the growth of the plant P is pulled from a attracting wire-20 which is installed at a predetermined height position from the medium. It is a device that is hung up by a suspended drawstring 21 and is pulled up sequentially as the stem extends. Conventionally, as shown in the conventional device (b) of FIG. 7, since the attraction wire-20 is installed at a relatively high place, the work platform is used to raise the work platform and work. Is the current situation. The worker was afraid to work at a high place, and there was a risk of falling.

On the other hand, in the device of the present invention, as shown in FIG. 7A, the attracting wire 20 is installed at a low position, and another attracting rod 22 is installed at the conventional attracting wire-installing position. Therefore, since the attracting wire is at a low position, the work carriage can be lowered to work.

The attracting cord 21 is provided with a retaining hook 23 for retaining and retaining one end on the attracting wire 20 and a winding tool 24. When attracting an elongated stem of a plant with this stem attracting device, the attracting string 21 is locked to the attracting wire-20 by the locking hook 23. Then, this attracting cord is wound around the attracting rod 22 from above and is hung downward. Then, the stems that have grown as the plant P grows are connected to the hanging string 21 by a holding member 25 such as a string or a clip. Then, as the stem grows along with the growth of the plant, the engaging hook 23 side of the attracting cord is pulled downward and is wound up by the winding tool 24, so that the suspended portion of the attracting cord is moved upward. The stem that is pulled and attached to it will be attracted upwards.

The embodiment shown in FIG. 8 will be described. A skylight 31 is provided on the ceiling of the greenhouse house 30 so as to be openable and closable. A ventilation duct 34 is laid under the floor 33 in the greenhouse 32, and the ventilation duct 34 is provided with an exhaust port 34a that opens upward.
The air from 5 flows through the air duct 34 from the floor 33 toward the inside of the greenhouse 32.

Therefore, according to the above configuration, when the temperature in the greenhouse is too high even when the skylight is fully opened, the inside of the greenhouse is forcibly ventilated upward from the basement of the greenhouse so that the inside of the greenhouse is predetermined. It is possible to lower the temperature of the plant to prevent the heat damage to the plants in the greenhouse.

In the embodiment shown in FIGS. 9 and 10, a hand truck 40 with a handle 41 is shown. The traveling wheels 42 of the carriage 40 are configured to move along a pipe rail 43 laid inside the house. Mounting pipes 44a, 44 having mounting holes at the left, right, front and rear four corners of the carriage 40.
b, 44c, and 44d are provided so as to be mounted vertically. The handle 4 is mounted on either side of the front side mounting pipes 44a and 44b or the rear side mounting pipes 44c and 44d.
1 is attached.

Then, as shown in FIGS. 11 and 12,
The harvest container base 46 with four long support legs 45 ...
The container stand 46 is set above the carriage 40 so that it can be set on the mounting pipes 44a, 44b, 44c and 44d after the handle 41 is removed so as to be located at a height position according to the height of the worker.

Therefore, in the carts shown in FIGS. 9 to 10, since the carts are low, the waist is burdened when the harvest container is packed with harvested products, but the carts shown in FIGS. 11 to 12 are high in the harvest container table. Since it is located, such a problem can be solved. In addition, the carriage 4 shown in FIGS. 13 and 14
At 0, the harvest container base 46
Is erected so as to be able to move up and down via an elevating link mechanism 47, and the height of the container base 46 can be finely adjusted by turning a screw rod 49 by an operating handle 48. The harvested crops are placed on the harvesting container platform 46, but empty containers or the like may be stored on the trolley 40 below.

[Brief description of drawings]

[Fig. 1] Side view of work trolley

[Fig. 2] Rear view of work trolley

[Fig. 3] Motor drive circuit diagram

[Fig. 4] Side view of the work trolley

[FIG. 5] Same as above, side view

FIG. 6 is a motor drive circuit diagram of another embodiment.

FIG. 7 is a side view of a plant stem attracting device.

FIG. 8 is a front view of a cutaway view of a greenhouse house.

[Fig. 9] Side view of the hand cart

[Fig. 10] Same as above, rear view

[Fig.11] Side view of hand cart

[Fig. 12] Same as above, front view

[Fig.13] Side view of hand cart

[Fig. 14] Same as above

[Explanation of symbols]

1 vehicle body, 2 front traveling wheel 3 rear traveling wheel 4 operation box 5 workbench 6 lifting link mechanism 7 lifting switch 11 traveling foot switch 12 controller 13 resistor 14 regenerative braking circuit 15 switching braking switch 16 forward / backward switch

Claims (2)

[Claims] 1. A work carriage provided with a worktable which can be lifted and lowered by an operator to ride on and work, and whose traveling wheels are electrically driven.
When the electric motor is stopped, the motor is stopped by applying a resistance to the inertial rotation of the motor with a regenerative brake circuit equipped with a resistor between both terminals of the motor. A work trolley characterized by being configured accordingly. 2. An electric motor is provided in the regenerative brake circuit.
2. The work carriage according to claim 1, further comprising switching means for switching between a state where the regenerative brake circuit is effective and a state where the regenerative brake circuit is not effective when the power is stopped.