JP3448953B2 - Brush rotation control device for self-propelled sweeper - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush rotation control device for a self-propelled sweeper used for cleaning works such as factories, warehouses and roads.

[0002]

2. Description of the Related Art As shown in FIG. 2, a self-propelled sweeper is
Like a typical automobile, the vehicle is equipped with drive wheels 2 and driven wheels 3 that are driven by an engine (or a battery) mounted on the vehicle body 1 as a drive source.・ Reverse can be switched. A main brush 7 that is driven to rotate around a horizontal axis is provided in the center of the machine body 1, and the rotation of the main brush 7 causes dust on the floor surface to enter the dust sweep port 8a of the dust box 8 installed on the front side of the machine body 1. It is designed to sweep toward you. Then, as shown in FIG. 5, the conventional main brush 7 is driven by the hydraulic motor 23 in the self-propelled sweeper.
The hydraulic motor 23 is driven by a hydraulic pump 23, and the hydraulic motor 23 is driven and stopped by switching operation of a directional control valve 24 provided in a circuit connecting the hydraulic pump 22 driven by the engine 21 and the hydraulic motor 23. Has become.

By the way, the cleaning (sweeping) performance of the sweeper can be expressed by the contact area A of the main brush 7 to the floor surface F per unit time. That is, in FIG. 3, the brush peripheral velocity is r1, and the relative velocity of the floor surface F with respect to the brush is V1.
1. When the brush length is L, generally A = (r1 + V
1) × L. In the conventional self-propelled sweeper of the type in which dust is swept into the front dust box 8, the peripheral speed r1 (rotation speed) of the main brush 7 is adjusted so that proper cleaning performance can be obtained when the machine body 1 moves forward. Had set.

The cleaning performance of the sweeper is theoretically higher as the contact area A of the main brush 7 with respect to the floor surface is larger, but in reality, if the peripheral speed r1 of the main brush 7 is too high, Since excessive dust may be generated or the main brush 7 may bounce, it is usual to set the proper rotation speed of the main brush 7 in consideration of these matters.

[0005]

Since the floor is generally cleaned while the machine body 1 is moving forward, conventionally, the rotation speed of the main brush 7 is set so that the cleaning performance is appropriate when moving forward. is doing. However, in the actual cleaning work, it may be more convenient to perform the cleaning while moving the machine body 1 backward. However, there was a problem that the cleaning performance was lower when moving backwards than when moving forwards. This is because the relative velocity V1 of the floor surface F with respect to the main brush 7 becomes negative and the contact area A of the main brush 7 with respect to the floor surface F per unit time decreases.

The present invention has been made in view of the above circumstances, and an object of the present invention is to rotate a self-propelled sweeper brush capable of obtaining proper cleaning performance regardless of the traveling direction of the machine body. It is to provide a control device.

[0007]

In order to solve the above problems, the invention of claim 1 was created. According to the present invention, a self-propelled machine body, a traveling direction switching means for switching the traveling direction of the machine body, a dust box attached to the machine body and having a dust sweeping port at the rear, and a machine body rotating around a horizontal axis line. A brush rotation control device of a self-propelled sweeper equipped with a brush for sweeping dust toward a dust sweep port of the dust box, which is a drive circuit of a motor for rotationally driving the brush. A motor drive stop switching means for switching between driving and stopping the motor, and a motor speed switching means for interlocking with the traveling direction switching means so as to switch the rotation speed of the motor in reverse so as to be increased more than in forward travel. It is characterized by having.

[0008]

In the self-propelled sweeper according to the first aspect of the present invention constructed as described above, when the traveling direction switching means is operated to switch the traveling direction of the machine body, the motor speed is switched in association with the traveling direction. The means are switched and the rotational speed of the motor is switched. That is, the peripheral speed of the brush is increased during the backward movement as compared with the forward speed, and the relative speed of the floor surface with respect to the brush due to the backward movement of the vehicle is corrected.

[0009]

[Means for Solving the Problems] In order to solve the above problems, the invention of claim 2 was created. According to the present invention, a self-propelled machine body, a traveling direction switching means for switching the traveling direction of the machine body, a dust box attached to the machine body and having a dust sweeping port at the rear, and a machine body rotating around a horizontal axis line. A brush rotation control device for a self-propelled sweeper, which is movably mounted and has a brush for sweeping dust toward a dust sweep port of the dust box, the hydraulic motor driving the brush and the hydraulic motor. A hydraulic circuit that connects a hydraulic pump that drives the hydraulic motor, and a directional control valve that can switch between driving and stopping the hydraulic motor; And a flow control valve for switching so as to increase the speed.

[0010]

In the self-propelled sweeper according to the second aspect of the present invention constructed as described above, when the traveling direction switching means is operated to switch the traveling direction of the machine body, the flow control valve is interlocked with it. Is switched and the rotational speed of the hydraulic motor is switched. That is, the peripheral speed of the brush is increased during the backward movement as compared with the forward speed, and the relative speed of the floor surface with respect to the brush due to the backward movement of the vehicle is corrected.

[0011]

Therefore, according to the first and second aspects of the present invention, the contact area of the brush with respect to the floor surface during the backward movement can be made equal to that during the forward movement.
Appropriate cleaning performance can be exhibited in both cases of reverse travel. Moreover, since the peripheral speed of the brush is automatically converted in association with the switching of the traveling direction of the machine body, there is no troublesome operation.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. The configuration of the self-propelled sweeper itself is the same as the conventional one. That is, as shown in FIG.
The machine body 1 is provided with driving wheels 2 and driven wheels 3 driven by an engine (or a battery) as a driving source, and a traveling direction, that is, forward / reverse traveling is switched by operating a forward / reverse switching lever 4 as traveling direction switching means. It is possible. In the figure, 5 indicates a driver's seat and 6 indicates a steering wheel.

At the lower center of the machine body 1, there is a main brush 7 for sweeping dust around a horizontal axis that traverses the machine body 1, and at the lower front portion of the machine body 1 is a dust box 8 for collecting dust. Are arranged horizontally,
As the main brush 7 rotates, dust on the floor surface is swept toward a dust sweep port 8a that is opened at the rear of the dust box 8. Although not shown, a side brush having a substantially vertical axis as a center of rotation for collecting dust on the floor toward the center of the body 1 is installed in front of one side of the body 1. It can be pulled up from the floor if necessary.

FIG. 1 shows a brush rotation control device according to this embodiment.
The hydraulic motor drive and speed control circuit of FIG. As shown in the drawing, the drive system of the main brush 7 according to the present embodiment is a hydraulic system, and includes a hydraulic pump 10 driven by an engine 9 and a hydraulic motor 11 for driving the main brush 7.
In the hydraulic circuit connecting the and, a directional control valve 12 as a brush drive / stop control means and a flow rate control valve 13 as a brush speed switching means are provided in series.

However, the directional control valve 12 is a 4-port 2-position manual (or electromagnetic) switching valve that can be switched between an operating position and a stop position, and is always held at the stop position shown in the figure. And is switched by the brush operating lever.
Further, the flow control valve 13 is a 4-port 2-position electromagnetic switching valve that can switch between a throttle position and a non-throttle position, and is provided on the downstream (or upstream) side of the directional control valve 12, and the forward / backward movement is possible. The switching is performed in association with the switching operation of the switching lever 4. That is, when the forward / reverse switching lever 4 is operated to the forward side, the flow rate control valve 13 is switched to the throttle position via the controller 14, and when the forward / reverse switching lever 4 is operated to the reverse side, the controller 14 is operated. Through the flow control valve 13
Can be switched to the non-stop position.

The self-propelled sweeper according to this embodiment is constructed as described above, and if the forward / reverse switching lever 4 is switched to the forward side while the directional control valve 12 is switched to the drive side, the controller can be operated. The flow rate control valve 13 is switched to the throttle position by the instruction of 14, and the amount of pressure oil sent from the hydraulic pump 10 to the hydraulic motor 11 is controlled by the throttle 13a, so that the hydraulic motor 11 is rotated at a speed corresponding thereto. On the other hand, if the forward / reverse switching lever 4 is switched to the reverse side, the flow control valve 13 is switched to the non-throttled position according to the instruction of the controller 14, and the amount of pressure oil sent from the hydraulic pump 10 to the hydraulic motor 11 is controlled by the throttle 13a. Therefore, the amount of oil sent to the hydraulic motor 11 is increased and the rotation speed thereof is increased.

In this way, when the machine body 1 moves backward, the rotational speed of the hydraulic motor 11 is increased more than that when moving forward to increase the peripheral speed of the main brush 7, so that the floor surface relative to the main brush 7 moves backward. The speed can be corrected. Table 1 shows the cleaning performance of the main brush 7.

[0018]

[Table 1]

In Table 1 and FIG. 3, V1 is the relative speed of the floor surface F when the vehicle body 1 is moving forward, and V2 is the relative speed of the floor surface F when the vehicle body 1 is moving backward. Further, L is the brush width. Normally, the relative speed V2 of the floor surface F with respect to the main brush 7 becomes negative when the vehicle moves backward, and the brush contact area A per unit time decreases. However, as described above, the brush peripheral speed r2 decreases when the vehicle moves backward. r2 = r1 + (V1 + V2)
By increasing the rotational speed of the main brush 7 so that the relative speed V2 of the floor surface F with respect to the main brush 7 during reverse travel is corrected, the brush contact area A per unit time during reverse travel during forward travel is corrected. Since it can be made equal to that, it becomes possible to make the cleaning performance at the time of the backward movement equal to that at the time of the forward movement.

As described above, according to the present embodiment, when the machine body 1 is run to clean the floor surface, the forward / reverse switching lever 4 is switched to forward or reverse to allow the main brush 7 to match its running direction. It is rotated at a rotation speed and can exhibit proper cleaning performance regardless of the traveling direction. Moreover, since the rotation speed of the main brush 7 is automatically switched, the operator is not bothered in operation.

Next, another embodiment of the present invention will be described with reference to FIG. This embodiment is an example in which the main brush 7 is driven by a DC electric motor, and as shown in the figure, a drive circuit of an electric motor 16 using a battery 15 as a drive source serves as motor drive stop switching means. Main switch 17 and changeover switch 18 as motor speed changeover means
And both switches 17 and 18 are connected to a resistor 19
A circuit including and a circuit not including are connected in parallel. The changeover switch 18 is configured to be changed over in connection with the changeover operation of the forward / reverse lever 4.

That is, in this embodiment, the rotation speed of the electric motor 16 is changed by switching the changeover switch 18 to the resistance 19 side or the non-resistance side in connection with the change of the traveling direction by the forward / backward lever 4. By setting the resistance value such that the brush contact area per unit time is the same when the machine body 1 is moving forward and when moving backward, it is possible to exhibit proper cleaning performance regardless of the traveling direction. .

In the illustrated embodiment, the rider-type self-propelled sweeper provided with the seat-type driver's seat in the machine body 1 is shown, but it may be applied to a walker-type walker operated by an operator.

[Brief description of drawings]

FIG. 1 is a hydraulic motor drive and speed control circuit diagram of a self-propelled sweeper according to an embodiment of the present invention.

FIG. 2 is a schematic side view of a self-propelled sweeper.

FIG. 3 is a diagram for explaining the cleaning performance of the main brush.

FIG. 4 is a drive and speed control circuit diagram of an electric motor according to another embodiment of the present invention.

FIG. 5 is a hydraulic motor drive circuit diagram of a conventional self-propelled sweeper.

[Explanation of symbols]

1 ... Airframe 4 ... Forward / reverse switching lever 7 ... Main brush 8 ... dust box 10 ... Hydraulic pump 11 ... Hydraulic motor 12 ... Directional control valve 13 ... Flow control valve

Claims (2)

(57) [Claims] 1. A self-propelled machine body, a traveling direction switching means for switching the traveling direction of the machine body, a dust box attached to the machine body and having a dust sweeping port at the rear, and a horizontal axis line on the machine body. A brush rotation control device of a self-propelled sweeper, which is rotatably mounted and has a brush for sweeping dust toward a dust sweep port of the dust box, wherein a drive circuit of a motor that drives the brush to rotate. Further, a motor drive stop switching means for switching between driving and stopping the motor, and a motor speed switching means for interlocking with the traveling direction switching means so that the rotation speed of the motor during reverse travel is increased so as to be higher than that during forward travel. Brush rotation control device for self-propelled sweeper with and. 2. A self-propelled machine body, a traveling direction switching means for switching the traveling direction of the machine body, a dust box attached to the machine body and having a dust sweeping port in the rear, and a horizontal axis line around the machine body. A brush rotation control device for a self-propelled sweeper, which is rotatably mounted and has a brush for sweeping dust toward a dust sweep port of the dust box, wherein a hydraulic motor for driving the brush and the hydraulic pressure A hydraulic circuit that connects a hydraulic pump that drives a motor is provided with a directional control valve that is capable of switching between driving and stopping the hydraulic motor, and the rotational speed of the hydraulic motor during reverse traveling in conjunction with the traveling direction switching means during forward traveling. A brush rotation control device for a self-propelled sweeper equipped with a flow rate control valve that switches so that the speed is increased.