JPH018702Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention is an automatic pump system for a power pest control machine that aims to prevent the power pest control machine from running dry when the chemical solution tank is empty. This relates to a stopping device.

[Conventional technology]

Conventionally, when spraying chemical solutions using a power pest control machine, the spraying operation is performed while visually checking the spray condition, and workers are required to take precautions such as stopping the pump of the power pest control machine before the chemical solution is emptied. They relied on their intuition when spraying chemical solutions. This is because if the pump is operated with an empty chemical tank, the pump will run idle, which not only causes wear of the packing but also shortens the life of the pump.

[Problem that the invention attempts to solve]

However, the conventional method of stopping the pump by visually checking the spray condition requires operator skill and cannot accurately detect the amount of chemical remaining, resulting in the pump running dry. At present, there is no solution to the problem of accelerating the wear of the packing and shortening the life of the pump, or in other words, the power pest control machine that incorporates the pump.

[Means for solving problems]

This invention was made with the intention of solving the above problem, and a float for detecting the amount of chemical liquid in the chemical liquid tank is installed at the bottom of the chemical liquid tank of the power pest control machine, and the float is communicated with the chemical liquid tank. In a pump stop device for intermittent driving of the pump via a clutch in a drive means for driving the pump, an electromagnetic clutch is disposed on the driven shaft of the pump and is integrally formed with a float disposed inside the chemical solution tank. A first circuit having one end of a connecting rod protruding outward from the chemical tank, and comprising an excitation part of the electromagnetic clutch and a relay contact, is provided between the electromagnetic clutch and the connecting rod of the float; The electromagnetic clutch is disconnected when the inside of the chemical liquid tank becomes empty by interposing an electric circuit formed by an operation changeover switch operated by displacement and a second circuit including a relay of the relay contact. It is designed to be activated.

〔Example〕

This invention will be explained below based on the drawings.

Fig. 1 is a system diagram showing the outline of the pump automatic stop device of this invention. In the figure, 1 is a pump, and the pump part such as a reciprocating pump that sucks in and discharges the chemical liquid in the chemical liquid tank 2 (described in detail). (not shown) is integrated, and engages a driven pulley 4 attached to a driven shaft 3 that drives the pump section and a drive pulley 7 attached to a drive shaft 6 of an engine 5, which is a driving means. The pump 1 is driven by a drive transmission means 8 such as a belt. In this case, an electromagnetic clutch 9 is attached to the driven pulley 4 of the pump 1, and the drive transmission is switched by the switching operation of the electromagnetic clutch 9.

On the other hand, the excitation part 9' of the electromagnetic clutch 9 is connected in series with a relay contact 10' constituting a normally closed contact, forming a first electric circuit (second (see figure), a relay 10 having the relay contact 10'
A limit switch 14 that operates in conjunction with a float 13 that detects the remaining amount of the chemical solution is arranged in parallel with the excitation section 9' and the relay contact 10' to form a second electric circuit. That is, a connecting rod 13' is disposed at the bottom of the chemical liquid tank 2 and is connected to a float 13 that moves downward when the remaining amount of the chemical liquid is zero, that is, when the inside of the chemical liquid tank 2 becomes empty.
By closing the limit switch 14, the second electric circuit is closed, and the relay 10 is energized to open the relay contact 10', so that the drive transmission side remains in the energized state. The electromagnetic clutch 9 located at the pump 1 is disengaged, cutting off the transmission drive and stopping the drive of the pump 1.

[Effect of idea]

As explained above, the automatic pump stop device of this invention provides the following effects. That is, (1) By disposing the electromagnetic clutch 9 on the driven shaft 3 of the pump 1, a) only the pump can be stopped by displacement of the float installed in the chemical tank, thereby preventing the pump from running dry; This can prevent damage to consumables such as gaskets installed inside the pump.

b Since the pump is automatically driven when the chemical solution is replenished into the chemical solution tank, it is possible to omit the trouble of starting the drive means every time the chemical solution is replenished, which reduces time and labor.

(2) By protruding one end of the connecting rod 13' that is integrally formed with the float 13 installed inside the chemical tank 2 to the outside of the chemical tank 2, a) the float and the connecting rod are made of corrosion-resistant material such as synthetic resin. Since the float and the connecting rod can be integrally molded from a flexible material, there is no fear that the float and the connecting rod will be corroded or separated by residual liquid in the chemical solution tank, and can be used safely for a long period of time.

b Since there is no magnet that is integrally formed with the float inside the chemical solution tank, there is no risk of the float and magnet coming apart after long-term use, or failure due to a decrease in the magnetic force of the magnet itself, and the float can be operated. It is certain.

(3) A first circuit including the excitation part 9' of the electromagnetic clutch 9 and the relay contact 10' is provided between the excitation part of the electromagnetic clutch 9 and the connecting rod 13' of the float 13, and the displacement of the float 13. By interposing an electric circuit formed by an actuation changeover switch 14 operated by the switch 14 and a second circuit including the relay 10 of the relay contact, a. The communication structure between the electromagnetic clutch and the float is simplified. Therefore, it is extremely easy to adapt to power pest control machines of different types such as backpack type, stationary type, and self-propelled type.
Installation space can be reduced and maintenance can be easily managed.

b. Since the chemical tank and the pump can be freely arranged, the design is easy regardless of the distance between the chemical tank and the pump, and the operation of the electromagnetic clutch can be maintained reliably by the displacement of the float.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing the outline of the pump automatic stop device of this invention, and FIG. 2 is an electric circuit diagram of this invention. In the figure, 1... pump, 2... chemical tank, 4... driven pulley, 5... engine (drive means), 7... drive pulley, 8... drive transmission means,
9... Electromagnetic clutch, 9'... Excitation section, 10...
Relay, 10'...Relay contact, 11...Battery, 13...Float, 14...Limit switch (changeover switch).

Claims (1)

[Scope of utility model registration request] A pump that has a float installed at the bottom of the chemical tank of the power pest control machine to detect the amount of chemical liquid in the chemical liquid tank, and that drives the pump intermittently through a clutch to a drive means that drives the pump that is communicated with the chemical tank. In the stop device, an electromagnetic clutch 9 is disposed on the driven shaft 3 of the pump 1, and one end of a connecting rod 13' integrally formed with a float 13 installed inside the chemical tank 2 is connected to the outside of the chemical tank 2. A first circuit is provided between the electromagnetic clutch 9 and the connecting rod 13' of the float 13, and includes an excitation part 9' of the electromagnetic clutch 9 and a relay contact 10', and an operation changeover switch 14 operated by the relay contact 10';
A power pest control machine is provided in which the electromagnetic clutch 9 is disconnected when the inside of the chemical liquid tank 2 is empty by interposing an electric circuit formed from a second circuit including a relay 10. Pump automatic stop device.