JPS6037243B2 - powered vacuum cleaner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power-driven vacuum cleaner for cleaning road surfaces, etc., and more specifically to control of the running speed of a vacuum cleaner that uses an engine as a prime mover and uses hydraulic drive to drive and clean a vehicle. be.

In the case of power-powered vacuum cleaners, if they run too fast during cleaning, it is not only dangerous but also makes cleaning sloppy.
It is normal to keep the driving speed lower than the normal driving speed,
Generally, it is considered desirable that the maximum speed for normal running is 10 to 162 m/h, and the maximum speed for cleaning run to be about 6 to 8 m/h.

Therefore, conventionally, the rotation speed of the hydraulic motor for driving the wheels was controlled by adjusting the discharge amount of the hydraulic pump or by adjusting the flow rate using a flow control valve for remote control built into the hydraulic circuit. Specifically, the swash plate or flow rate adjustment valve that adjusts the discharge amount of the hydraulic pump is moved by a link mechanism such as a pedal and a cable, which is provided under the foot of the driver's seat, and when the foot of the pedal is pressed. The running speed is controlled by operation, but such pedal-operated machines force the worker to maintain a certain posture, which can make the worker tired and is not suitable for cleaning over long periods of time. In addition, since the above-mentioned lotus folding means is required, there is a problem that the structure becomes complicated. The present invention was made in view of the above-mentioned conventional problems.
To provide a powered vacuum cleaner whose running speed can be easily switched between high speed and low speed depending on the running mode between normal running and cleaning running.

Hereinafter, illustrated embodiments embodying the present invention will be described. First, a first embodiment will be described based on FIGS. 1 and 2. Fig. 1 shows an outline of a power-driven vacuum cleaner, and 1 is a main body part extending in the longitudinal direction of the vehicle and spaced apart in the lateral direction. A driver's seat 3 is installed in the upper part of the engine compartment 2, and a control handle 4 is installed in front of the driver's seat 3. A cleaning chamber 6 that accommodates a main brush 5 is formed substantially at the lower center of the main vehicle body portion 1, and the main brush 5 is supported so as to be movable up and down by a lift mechanism (not shown). Further, a dust box 7 for collecting dust is provided at the front of the main vehicle body part 1, and this dust box 7 has a built-in dust pan and filter 8 for storing the dust swept by the main brush 5. It is supported by a lift arm 9 and a guide rail (not shown) so as to be dumpable, and the dumping operation is performed by a dump cylinder 10. In addition, 11 is a side brush, 12 is a drive wheel, 1
3 is a blower. Next, the hydraulic drive of the traveling and cleaning hydraulic actuators in the vacuum cleaner configured as described above will be explained based on the hydraulic circuit diagram shown in FIG. As shown in the figure, the hydraulic circuit includes a travel system hydraulic circuit whose pressure supply source is a parent hydraulic pump 15 in a tandem hydraulic pump driven by an engine 14, and a cleaning hydraulic circuit whose pressure supply source is a child hydraulic pump 16 of the tandem hydraulic pump. It consists of a system hydraulic circuit. In the travel system hydraulic circuit, the travel hydraulic motor 7 is connected to the travel hydraulic pump 15.
``A counterbalance valve 19 that stably rotates the hydraulic motor 7 according to the pump discharge amount regardless of the load fluctuation of the driving system control circuit 18 that controls the operation (forward/reverse) and stop of the drive wheel 12 and the drive theory 12. The traveling system control circuit 18 is connected to a lever-operated 6-boat 3-position switching valve 20 that switches the flow direction of pressure oil to the hydraulic motor 7, and a lever-operated 6-boat 3-position switching valve 20 that switches the flow direction of pressure oil from the hydraulic motor 17 to the hydraulic pump 15. includes a check valve 21 to prevent backflow of water and a leaf valve 22 to limit the pressure in the travel system circuit to a set value or less,
The set pressure of the yield leaf valve 22 is set to, for example, 20k9/su. On the other hand, in the cleaning hydraulic circuit, the main brush hydraulic motor 23 is connected to the cleaning hydraulic pump 16.
, side brush hydraulic motor 24, and dump cylinder 0 are connected via a cleaning system control circuit 25 that controls the operation and stopping of each oil actuator for cleaning, and both the main brush and side brush hydraulic Motors 23, 24
The dump cylinders 0 and 0 are arranged in series, and the dump cylinder 0 is also arranged in parallel.

The cleaning system control circuit 25 includes six lever-operated boats 3 that switch the flow of pressure oil to each cleaning hydraulic actuator.
position type switching valve 26, check valve 27 that prevents backflow of pressure oil from the hydraulic actuator to the hydraulic pump 16, both brushes 5,
A brush flow regulating valve 28 adjusts the amount of pressure oil pumped to both hydraulic motors 23 and 24 in order to obtain the optimum rotation speed of 11. Pressure oil is pumped to the dump cylinder river to give a desired dumping speed to the dust box 7. It includes a dump cylinder flow rate adjustment valve 29 that adjusts the amount, and a relief valve 30 that limits the pressure in the cleaning system circuit to a set value or less, and the set pressure of the relief valve 30 is lower than that of the traveling system relief valve 22. For example, it is set to 80k9'. Therefore, in the above hydraulic circuit, the discharge side of the hydraulic pump 15 in the traveling system hydraulic circuit, that is, the discharge pipe 31
It is connected to one boat on the outlet side of the switching valve 26 in the cleaning system hydraulic circuit by a lotus passage 32, and this lotus passage 32 only allows pressure oil to flow from the cleaning system to the travel system. A check valve 33 is incorporated.

The travel system switching valve 20 connects the discharge pipe 31 to the return pipe 34 in the neutral position, and the cleaning system switching valve 26 connects the cleaning system discharge pipe 35 to the return pipe 34 in the neutral position. This embodiment is configured as described above, and its operation will be explained below.

[During normal driving]

In this case, when the switching valve 20 in the driving system control circuit 18 is switched to the forward position or the reverse position while the switching valve 26 in the cleaning system control circuit 25 is held in the neutral position, the pressure oil sent by the driving system hydraulic pump 15 is is the discharge pipe 31
Pressure oil is sent to the traveling hydraulic motor 7 through the swivel valve 20 and the counterbalance valve 19, while the pressure oil sent by the cleaning hydraulic pump 16 is passed through the discharge pipe 35, the slit valve 26, and the lotus passage 32. The fuel is then pressure-fed to the traveling system discharge pipe 31 via the check valve 33.

That is, since the pressure oil discharged from both hydraulic pumps 15 and 16 joins and is pumped to the hydraulic motor hole for driving,
The rotation speed of the drive wheels 12 increases, and the cleaner runs at high speed. In addition, when a high load is applied to the drive system 12 during the above-mentioned normal driving, for example, when the pressure in the circuit increases due to uphill driving, the set pressure of the cleaning system relief valve 30 is changed to the driving system relief valve 30. Since the pressure is set lower than that of the valve 22, the cleaning system relief valve 30 operates first and the vehicle speed decreases accordingly, and if the pressure in the circuit further increases, the driving system relief valve 22 operates next and prevents overload. Load operation is prevented.

[During cleaning work] In this case, the switching valve 20 in the travel system control circuit 18 is switched to the forward position, and the switching valve 26 in the cleaning system control circuit 25 is switched to the cleaning position (left side position in FIG. 2).

Therefore, the pressure oil from the cleaning hydraulic pump 16 is discharged from the discharge pipe 3.
5 through the switching valve 26 to both the side brush and main brush hydraulic motors 24 and 23.
, 11 are rotated at a set rotation speed, and on the other hand, the traveling system hydraulic motor 7 is driven only by the oil pumped from the traveling system hydraulic pump 15, so the vacuum cleaner is operated at a low speed suitable for cleaning work. It will be run. That is, during cleaning work, the travel system hydraulic circuit and the cleaning system hydraulic circuit operate independently. [When releasing dust] To release the dust accumulated in the dust box 7 to a predetermined location, switch the switching valve 20 in the driving system control circuit 18 to the neutral position to stop running, and then switch the switching valve 20 in the cleaning system control circuit 25 to the neutral position. Switch the valve 26 to the dump position (right side position in FIG. 2).

Therefore, the pressure oil from the cleaning hydraulic pump 16 is discharged from the discharge pipe 3.
5. Since the dust is pumped into the dump cylinder via the transfer valve 26, the extension of the dump cylinder 10 causes the lift arm 9 to rotate upward, dumping the dust box 7 as shown by the imaginary line in FIG. 1, and releasing the dust. . After discharging dust, if the cleaning system switching valve 26 is switched to the neutral position, the oil in the dump cylinder 0 will flow from the switching valve 26 to the cleaning system return pipe 3.
6 and returns to the tank 37, the dust box 7 is returned to its original position by its own weight as the dump cylinder 0 is reduced.

Next, a second embodiment of the present invention will be explained based on FIG.

The first embodiment described above includes the main brush 5 and the side brush 1.
1 is driven at the same time, this second
In this embodiment, a hydraulic motor 23 for the main brush is installed in series in the discharge pipe 35 on the inlet side of the cleaning system switching valve 26, so that only the main brush 5 can be driven independently. The configuration is similar to the first embodiment.
Therefore, in cases where a somewhat rough cleaning that does not require the side brush 11 is acceptable, cleaning using only the main brush 5 can be performed by running at high speed while the cleaning system switching valve 26 is held at the neutral position. However, high-speed running in this case is obtained as a composite of the total capacity of the cleaning hydraulic pump 16 excluding the capacity required to drive the main brush 5 and the total capacity of the traveling hydraulic pump 15. If the cleaning system switching valve 26 is switched to the cleaning position, cleaning can be performed at low speed using both brushes 5 and 11, as in the first embodiment. Further, in the case of the second embodiment, the main brush 5 is rotated even during normal driving, but there is no problem because the main brush 5 is raised and held in the upper position by another mechanism. next,
A third embodiment of the present invention will be described based on FIG.

In this embodiment, in a series circuit between the hydraulic motor 23 of the main brush 5 and the hydraulic motor 24 of the side brush 11, both the hydraulic motors 23 and 2 are connected between the two hydraulic motors 237 and 24.
A lever-operated three-boat, two-position switching valve 38 is incorporated between the four, and the other configuration is the same as that of the first embodiment. Therefore, "In the case of the third embodiment, the cleaning system switching valve 2
In addition to the switching operation of step 6, by switching the switching valve 38 to the rest position (lower layer shown) or the operating position, only the main brush 5 can be driven independently, or the main brush 5 can be driven independently.
By driving the side brush 11 and the side brush 11 at the same time, they can be used depending on the type of cleaning. As described in detail above, the present invention provides a power-driven vacuum cleaner that travels and cleans using hydraulic drive, in which a dedicated hydraulic pump is provided for each of the traveling system hydraulic circuit and the cleaning system hydraulic circuit, and both hydraulic circuits are driven from the cleaning system. The hydraulic pump for the cleaning system can be switched between cleaning and traveling by connecting the lotus pipe with a check valve that allows pressure oil to flow into the system, and operating the travel system and cleaning system switching valves. It is designed so that it can be used for different purposes, and high speed and low speed can be obtained depending on the driving mode of normal driving and cleaning driving by an extremely simple operation of switching the switching valve.

Therefore, it is possible to reduce worker fatigue compared to the conventional foot-operated pedal type, and it is also structurally simpler because only two levers are needed to operate both the travel system and cleaning system switching valves. This is extremely effective in simplifying the process.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a schematic side view of a power-driven vacuum cleaner; FIG. 2 is a hydraulic circuit diagram showing the first embodiment of the invention; and FIG. 3 is a hydraulic circuit diagram of the second embodiment of the invention. Hydraulic circuit diagram showing an embodiment. FIG. 4 is a hydraulic circuit diagram showing a third embodiment of the present invention. 5... Main brush, 10... Dump cylinder, 11.
...Side brush, 12...Driving theory, 14...
・Engine, 15, 16... Hydraulic pump, 17, 2
3,24...Hydraulic motor, 20,26...
...Kirifusuma valve, 32...Rentsu conduit, 33...
non-return valve. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1 The discharge side of the hydraulic pump in the travel system hydraulic circuit including a switching valve that controls the flow direction of the hydraulic oil supplied from the travel hydraulic pump and governs the operation of the travel actuator, and the hydraulic oil supplied from the cleaning hydraulic pump. In a cleaning system hydraulic circuit including a switching valve that controls the flow direction of hydraulic oil to control the operation of the cleaning actuator, the outlet side of the switching valve is connected to a check valve that allows flow from the cleaning system to the travel system. The cleaning hydraulic pump is connected by a communicating pipe line including the cleaning hydraulic pump, and the hydraulic oil of the cleaning hydraulic pump is supplied to the traveling actuator by switching the switching valve in the cleaning hydraulic circuit to the rest position. A powered vacuum cleaner.