JP5689301B2 - High pressure washing apparatus and high pressure washing car equipped with the same - Google Patents

Description

  The present invention relates to cleaning of pipes to be cleaned such as sewage pipes and distribution pipes with high-pressure water, maintenance of sewage pipes such as root cutting of street trees, civil engineering construction related to tunnel collapse pretreatment, heat exchanger cleaning, tanks, etc. The present invention relates to a high-pressure washing apparatus for performing various processes such as washing, various pipe washing and other plant maintenance relations, and a high-pressure washing vehicle equipped with the same.

  2. Description of the Related Art Conventionally, a high-pressure washing vehicle that performs washing in a pipe to be cleaned such as a sewer pipe or a drain pipe is known (for example, see Patent Document 1). This type of high-pressure washing vehicle includes a hose provided with a washing nozzle at the tip, a hose reel around which the hose is wound, and a water pump for ejecting high-pressure water from the tip of the hose. Then, at the time of the cleaning operation by the high pressure cleaning vehicle, the tip of the hose is inserted into the pipe to be cleaned from the manhole, the water pump is operated, and high pressure water is ejected from the cleaning nozzle at the tip of the hose.

  In this type of high-pressure washing vehicle, high-pressure water is obtained by a water pump driven by an engine via a PTO. At this time, in order to obtain high-pressure water, it is necessary to drive the water pump by increasing the engine speed. Conventionally, the engine speed is adjusted by operating the accelerator lever of the engine. However, after the adjustment at the beginning of the work, the engine speed remains fixed. And problems arise in terms of noise.

  In this regard, for example, Patent Document 2 discloses a high-pressure washing vehicle in which a high-pressure pump is driven by engine power, and high-pressure water from the high-pressure pump is connected to a water discharge nozzle through an unload valve (pressure regulating valve) and an opening / closing operation valve. In the high-pressure water discharge device, a flow sensor is provided in the middle of the high-pressure water channel between the unload valve (pressure regulating valve) and the water discharge nozzle, and when the flow rate sensor signal is input to reduce the flow rate, the engine accelerator is lowered. It is described that the control circuit for controlling the engine is provided so that the engine speed is reduced and the noise is reduced when the water discharge is stopped.

Utility Model Registration No. 2510670 Registered Utility Model No. 3002657

  In the high-pressure washing vehicle described in Patent Document 2, the accelerator of the engine is lowered based only on the signal of the flow sensor, but the electronic governor cannot be adjusted by the accelerator controller, so that the engine speed is complicated. There are problems such as being unable to control.

  Therefore, an object of the present invention is to provide a high-pressure washing apparatus capable of reducing fuel consumption during a washing operation and a high-pressure washing vehicle equipped with the same.

  The high-pressure washing apparatus of the present invention sets a water pump that generates high-pressure water, an engine that is connected to the water pump and rotationally drives the water pump, a flow sensor that detects the flow of high-pressure water, and an engine speed. In a high-pressure washing apparatus having a manual accelerator, a high-pressure water injection sensor for detecting a high-pressure water injection position of the manual accelerator, and a selector switch for switching between a normal mode and an auto accelerator mode of the engine speed, the selector switch is an auto accelerator. When the flow sensor detects the flow of high-pressure water while the mode is switched to the mode and the high-pressure water injection position of the manual accelerator is detected by the high-pressure water injection sensor, the engine speed is set by the manual accelerator. When the flow rate of high pressure water is not detected by the flow sensor, or manually by the high pressure water jet sensor When the injection position of the high-pressure water Kuseru is not detected are those having an accelerator control device for the rotational speed of the engine idle speed.

  According to the present invention, when the flow sensor detects the flow of high-pressure water with the changeover switch being switched to the auto accelerator mode and the high-pressure water injection position of the manual accelerator detected by the high-pressure water injection sensor, If the engine speed is set to the speed set by the manual accelerator and the flow sensor does not detect the flow of high-pressure water, or the high-pressure water injection sensor does not detect the high-pressure water injection position, the engine speed Since the number is the idling speed, it is possible to reduce the fuel consumption during the cleaning operation.

  The accelerator control device preferably controls the engine speed by outputting the same voltage as the throttle sensor to the engine control device that electronically controls the engine. As a result, it is only necessary to connect the voltage output of the accelerator control device to the engine control device, so there is no need to modify the engine control device.

(1) A water pump that generates high-pressure water, an engine that is connected to the water pump and rotationally drives the water pump, a flow sensor that detects the flow of high-pressure water, a manual accelerator that sets the engine speed, and a manual In a high-pressure washing apparatus having a high-pressure water injection sensor that detects the injection position of high-pressure water in the accelerator and a change-over switch that switches between a normal mode and an auto-accelerator mode of the engine speed, the change-over switch is switched to the auto-accelerator mode. In addition, when the flow of high-pressure water is detected by the flow sensor while the high-pressure water injection position of the manual accelerator is detected by the high-pressure water injection sensor, the engine speed is set to the speed set by the manual accelerator, and the flow When the sensor does not detect the flow of high-pressure water, or the high-pressure water jet sensor When the morphism position is not detected, by having an accelerator control device for the rotational speed of the engine idle speed to reduce fuel consumption during the cleaning operation, it is possible to reduce the fuel cost.

(2) The accelerator control device controls the engine speed by outputting the same voltage as the throttle sensor to the engine control device that electronically controls the engine. Since it only needs to be connected to the engine control device, there is no need to modify the engine control device.

It is a side view of the high-pressure washing truck in an embodiment of the invention. It is a top view of FIG. It is a rear view of FIG. It is a figure which shows the water piping of the high pressure washing vehicle in this embodiment. It is a block diagram which shows the engine speed control system of the suction vehicle of FIG. It is a figure which shows the accelerator lever inside an operation panel, and an accelerator sensor vicinity, Comprising: (a) is a top view, (b) is a front view. It is a flowchart of engine speed control.

  1 is a side view of a high-pressure washing vehicle according to an embodiment of the present invention, FIG. 2 is a plan view, and FIG. 3 is a rear view. As shown in FIGS. 1 to 3, the high-pressure washing vehicle 1 in this embodiment includes a tank 11 that stores water on a chassis 10, a pump chamber 12 that houses a water pump 60 (see FIG. 4), A large hose reel 2 as a first hose reel around which a large hose 2a as a first hose is wound, a small hose reel 3 as a second hose reel around which a small hose 3a as a second hose is wound, and a large hose reel 2 In addition, a high-pressure washing apparatus including an operation panel 4 for performing rotational driving of the small hose reel 3 and ejection of high-pressure water from the large hose 2a and the small hose 3a is mounted.

  The large hose reel 2, the small hose reel 3, and the operation panel 4 are mounted on the rear end portion of the chassis 10 via a turntable 5 that can rotate about a vertical axis. A cleaning nozzle 2b is attached to the tip of the large hose 2a, and a cleaning gun 3b is attached to the tip of the small hose 3a (see FIG. 4). The cleaning nozzle 2b is configured to eject high-pressure water obliquely rearward from the tip of the large hose 2a, and thereby a propulsive force is applied to the large hose 2a. Further, the cleaning gun 3b is sprayed as appropriate for cleaning the vicinity of the manhole, and the water flow in the small hose 3a stops or flows each time. A cleaning nozzle can be attached to the tip of the small hose 3a instead of the cleaning gun 3b.

  Next, the water piping of the high-pressure washing vehicle 1 in this embodiment will be described. FIG. 4 is a view showing a water pipe of the high-pressure washing vehicle 1 in the present embodiment. A water pump 60 shown in FIG. 4 is driven by an engine 30 (see FIG. 5) connected via a pulley / V belt (not shown), a drive shaft, and a PTO (power take-off device) 14 (see FIG. 5). . The water pump 60 has a suction side 60a communicating with the bottom of the tank 11 by a pipe 70, a strainer 80, and pipes 72, 73, 74, and a discharge side 60b having a pipe 75, a pressure regulating valve 61, a pipe 76, and a valve. 62, 63, the large hose reel 2 and the small hose reel 3 are communicated with the large hose 2a and the small hose 3a, respectively.

  In FIG. 4, reference numeral 77 denotes a pipe for returning water to the tank 11 through the valve 64. Reference numerals 65, 66, 67, and 68 denote drain valves, and reference numeral 78 denotes a pipe for pouring water into the tank 11 through the valve 69. A flow sensor 34 that detects the flow of high-pressure water is provided in the middle of the pipe 76.

  The pressure regulating valve 61 also has a function of a three-way valve that is remotely operated. The pipe 75 is connected to the inflow port 61 a of the pressure regulating valve 61. The pipe 76 is connected to the outflow port 61 b of the pressure regulating valve 61. Further, the return port 61 c of the pressure regulating valve 61 is connected to the tank 11 via a return pipe 79. In the ON state, the pressure regulating valve 61 guides water flowing from the pipe 75 to the pipe 76. However, when the pressure regulating valve 61 becomes equal to or higher than a predetermined set pressure, the pressure is adjusted to the set pressure by allowing a part of water to escape to the tank 11 through the return pipe 79. On the other hand, in the OFF state, the pressure regulating valve 61 guides water flowing from the pipe 75 to the return pipe 79 and discharges it to the tank 11.

  Next, the engine speed control system of the high-pressure washing vehicle 1 will be described with reference to FIG. FIG. 5 is a block diagram showing an engine speed control system of the high-pressure washing vehicle 1 of FIG.

  As shown in FIG. 5, the high-pressure washing vehicle 1 includes an electronic governor 31 that adjusts the rotational speed of the engine 30, and an ECU (an engine control device that electronically controls the engine 30 by sending a control voltage to the electronic governor 31. An engine control unit) 32. Further, in the operation panel 4 mounted on the chassis 10 as described above, the accelerator control device 33, the flow sensor 34, the accelerator lever 35, the accelerator sensor 36, the mode changeover switch 37 and the auto accelerator lamp 37a shown in FIG. Is provided. The accelerator lever 35 is provided with a proximity sensor 38 that detects the injection position of the high-pressure water of the accelerator lever 35. The mode changeover switch 37 is a changeover switch for switching between the normal mode and the auto accelerator mode of the rotational speed of the engine 30. The auto accelerator lamp 37a is an LED lamp that is lit when the auto accelerator mode is selected by the mode switch 37.

  6A and 6B are views showing the vicinity of the accelerator lever 35 and the accelerator sensor 36 inside the operation panel 4, wherein FIG. 6A is a plan view and FIG. 6B is a front view. As shown in FIG. 6, the accelerator lever 35 is pivotally supported by a pin 35a and is connected to the accelerator sensor 36 via a bracket 36a, a rod 36b, and links 36c and 36d. The accelerator lever 35 is provided with a detected piece 38 a that is detected by the proximity sensor 38. The proximity sensor 38 functions as a high-pressure water injection sensor that determines the presence or absence of high-pressure water injection based on whether or not the detected piece 38 a is detected, and the detection signal is input to the accelerator control device 33.

  The accelerator lever 35 is a manual accelerator for manually setting the rotational speed of the engine 30. The accelerator sensor 36 outputs a voltage corresponding to the amount of operation of the accelerator lever 35, and the accelerator control device 33 responds to the voltage input from the accelerator sensor 36 with a voltage similar to that of the chassis side throttle sensor (hereinafter referred to as “ The number of revolutions of the engine 30 is controlled by outputting "throttle voltage" to the ECU 32.

  When high-pressure water is jetted from the cleaning gun 3b of the high-pressure cleaning vehicle 1 having the above-described configuration, the water pump 60 is driven, the valve 64 is closed, the valve 63 is opened, and high-pressure water is supplied from the cleaning gun 3b at the tip of the small hose 3a. Erupt. Water is sucked into the water pump 60 from the tank 11 through the pipes 74, 73, 72, the strainer 80 and the pipe 70 to be pressurized, passes through the pipe 75, the pressure regulating valve 61, the pipe 76, the valve 63 and the small hose reel 3. Supplied to the small hose 3. At this time, in the high-pressure washing vehicle 1 in the present embodiment, the engine speed is controlled by the following procedure. FIG. 7 is a flowchart of engine speed control.

  First, the power source of the accelerator control device 33 is in an off state (S100), and when the engine is started by turning on the key SW30a of the high pressure washing vehicle 1 (S101), the power source of the accelerator control device 33 is turned on (S102). . Next, when the ON signal of the PTO 14 is input (S103) and the mode changeover switch 37 is in the normal mode (S104), when the accelerator lever 35 is operated (S105), the accelerator control device 33 is input from the accelerator sensor 36. The throttle voltage corresponding to the applied voltage is output to the ECU 32 (S106). As a result, the engine 30 is controlled by the ECU 32 so as to have the rotational speed set by the accelerator lever 35.

  At this time, when an ON signal is output from the proximity sensor 38 as a high-pressure water injection sensor, that is, when the injection position of the high-pressure water of the accelerator lever 35 is detected (S107), the pressure regulating valve 61 is turned on, and the high pressure is supplied from the small hose 3a. Water is jetted (S108). Further, when the ON signal is not output from the proximity sensor 38 as the high pressure water injection sensor, that is, when the injection position of the high pressure water of the accelerator lever 35 is not detected (S107), the pressure regulating valve 61 is turned off and the small hose 3a The injection of high-pressure water stops (S109). Then, the control of the accelerator control device 33 is ended by the OFF signal of the PTO 14 (S114).

  On the other hand, when the mode selector switch 37 is in the automatic accelerator mode (S104), when the accelerator lever 35 is operated (S110), the contact output of the proximity sensor 38 is turned on, that is, the high-pressure water jet sensor is turned on (S111), and the flow sensor 34 When the contact output is on (high pressure water is injected from the small hose 3a) (S112), the accelerator control device 33 outputs a throttle voltage corresponding to the voltage input from the accelerator sensor 36 to the ECU 32 (S113). ). As a result, the engine 30 is controlled by the ECU 32 so as to have the rotational speed set by the accelerator lever 35. Then, the control of the accelerator control device 33 is ended by the OFF signal of the PTO 14 (S114).

  When the mode changeover switch 37 is in the auto accelerator mode (S104), the contact output of the proximity sensor 38 is turned off, that is, the high-pressure water jet sensor is turned off (S111), or the contact output of the flow sensor 34 is turned off (small hose). When the injection of high-pressure water from 3a is stopped (S112), the accelerator control device 33 outputs a throttle voltage to the ECU 32 so that the rotational speed of the engine 30 becomes the idle rotational speed (S115).

  Note that the accelerator control device 33 is configured to output a throttle voltage so as not to exceed the maximum rotational speed of the engine 30 regardless of the operation amount of the accelerator lever 35.

  As described above, in the high-pressure washing vehicle 1 according to the present embodiment, the flow sensor with the mode changeover switch 37 switched to the auto accelerator mode and the proximity sensor 38 has detected the injection position of the high-pressure water in the accelerator lever 35. When the flow of high-pressure water is detected by 34, the rotation speed of the engine 30 is set to the rotation speed set by the accelerator lever 35, and when the flow sensor 34 does not detect the flow of high-pressure water or by the proximity sensor 38, the accelerator lever 35 When the injection position of the high-pressure water is not detected, the rotational speed of the engine 30 is set to the idle rotational speed, so that it is possible to reduce the fuel consumption during the cleaning operation.

  Further, in the high-pressure washing vehicle 1 according to the present embodiment, the accelerator control device 33 controls the rotational speed of the engine 30 by outputting a voltage similar to that of the chassis side throttle sensor to the ECU 32 that electronically controls the engine 30. Therefore, it is only necessary to connect the voltage output of the accelerator control device 33 to the ECU 32. Therefore, it is not necessary to modify the ECU 32, and it is possible to provide a high-pressure washing apparatus and a high-pressure washing vehicle 1 equipped with the high-pressure washing apparatus that can reduce the fuel consumption during the suction operation at low cost.

  The present invention relates to cleaning of pipes to be cleaned such as sewage pipes and distribution pipes with high-pressure water, maintenance of sewage pipes such as root cutting of street trees, civil engineering construction related to tunnel collapse pretreatment, heat exchanger cleaning, tanks, etc. It is useful as a high-pressure washing device for carrying out various treatments such as washing, various pipe washing and other plant maintenance relations, and a high-pressure washing vehicle equipped with this, and in particular it can reduce fuel consumption during washing operations It is suitable as a high-pressure washing apparatus and a high-pressure washing car equipped with the same.

DESCRIPTION OF SYMBOLS 1 High pressure washing car 2 Large hose reel 2a Large hose 2b Cleaning nozzle 3 Small hose reel 3a Small hose 3b Cleaning nozzle 4 Control panel 5 Turntable 10 Chassis 11 Tank 12 Pump room 14 PTO
30 Engine 31 Electronic governor 32 ECU
33 accelerator control device 34 flow sensor 35 accelerator lever 36 accelerator sensor 37 mode selector switch 37a auto accelerator lamp 38 proximity sensor 60 water pump 61 pressure regulating valve 62, 63, 64, 69 valve 65, 66, 67, 68 drain valve 70, 72 , 73, 74, 75, 76, 77, 78 Piping 79 Return piping 80 Strainer

Claims (4)

A water pump for generating high pressure water;
An engine coupled to the water pump for rotationally driving the water pump;
A flow sensor for detecting the flow of the high-pressure water;
A manual accelerator for setting the engine speed;
A high-pressure water injection sensor for detecting a high-pressure water injection position of the manual accelerator;
In the high-pressure washing apparatus having a changeover switch for switching between a normal mode and an auto accelerator mode in which the engine speed is set to the speed set by the manual accelerator ,
When the flow sensor detects the flow of the high-pressure water in the state where the changeover switch is switched to the auto accelerator mode and the high-pressure water injection position of the manual accelerator is detected by the high-pressure water injection sensor, When the rotational speed of the engine is set to the rotational speed set by the manual accelerator and the flow sensor does not detect the flow of the high-pressure water, or when the high-pressure water injection sensor does not detect the high-pressure water injection position of the manual accelerator Is a high-pressure washing apparatus having an accelerator control device for setting the engine speed to an idle speed.
  The high-pressure washing apparatus according to claim 1, wherein the high-pressure water jet sensor is a proximity sensor that detects a jet position of the high-pressure water of the manual accelerator.   3. The high pressure washing according to claim 1, wherein the accelerator control device controls the number of revolutions of the engine by outputting a voltage similar to that of a throttle sensor to an engine control device that electronically controls the engine. apparatus.   A high pressure washing vehicle equipped with the high pressure washing apparatus according to any one of claims 1 to 3.

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