JPH0340801Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is a cylinder lock detection device, specifically an automatic locking mechanism that can automatically lock the piston rod to prevent the piston rod from being inadvertently retracted. This invention relates to a device for detecting the standby or locked state of a cylinder.

BACKGROUND ART Recently, the applicant has been working on cleaning the inside of a garbage collection box by lifting the garbage input box of a garbage collection truck backwards.
We have proposed a lifting cylinder lock mechanism for a garbage collection vehicle that can prevent accidents such as the lifted garbage dumping box inadvertently lowering during maintenance inspection of the garbage dumping box. 61−
It was proposed in No. 127628, etc. as a "safety device when lifting the garbage dumping box in a garbage collection vehicle."

Therefore, the lifting cylinder lock mechanism in the above-mentioned garbage collection vehicle will be explained below with reference to FIGS. 3 and 4. FIG. 3 is a schematic diagram of the garbage collection vehicle showing the ascending cylinder lock mechanism, and FIG. 4 is a hydraulic/electrical circuit diagram of the ascending cylinder lock mechanism of FIG. still,
The same reference numerals in FIGS. 3 and 4 indicate the same members. In the figure, 1 is the vehicle body,
A garbage storage box 3 is placed on the vehicle chassis 2 so that it can be dumped rearward, and a garbage input box 4 is attached to the rear opening of the garbage storage box 3 so that it can be lifted and opened rearward. 5 indicates the driver's cabin. The garbage loading box 4 has a garbage loading device (not shown) arranged therein, and the garbage loading device transfers the garbage thrown in from the garbage loading port (not shown) formed on the rear surface to the garbage storage box 3. It is designed to be loaded inside. Reference numeral 6 denotes a lifting cylinder for lifting and opening the garbage input box 4 rearward, and its base end is pivotally connected to the rear surface of the side frame of the garbage storage box 3, and the tip of the piston rod is connected to the outer wall of the garbage input box 4. be. This rising cylinder 6 is extended by hydraulic pressure,
It is a single-acting type that lowers due to the weight of the garbage disposal box 4. In addition, the lift cylinder 6 has a built-in locking mechanism (not shown), which locks the piston rod from moving in and out, causing the garbage input box 4 to fall unexpectedly due to hydraulic trouble, etc., resulting in an accident resulting in injury or death. Prevent the outbreak from occurring. 7 is the rising cylinder 6
This is a single-acting lock release cylinder that is integrally attached to the cylinder.When the cylinder is contracted by a spring (not shown), the lift cylinder 6 is in a lock standby or locked state, and is extended against the spring by hydraulic pressure. At this time, the lift cylinder 6 is in an unlocked state. Reference numeral 8 designates an operating valve connected to the lift cylinder 6 and the lock release cylinder 7. When the lift cylinder 6 is switched to the left switching position in FIG. Extension of the cylinder 6 is stopped, and
When it is switched to the right position in FIG. 4, the lock release cylinder 7 is extended, thereby releasing the lock of the rising cylinder 6, and the rising cylinder 6 is contracted by the weight of the garbage input box 4, and the inside of the rising cylinder 6 is When the excess pressure oil is returned to the oil tank 9 and returned from the above-mentioned right-hand switching position to the neutral position, the lock release cylinder 7 is contracted by the spring, whereby the lift cylinder 6 is placed on standby or locked.
At the same time, excess pressure oil in the lock release cylinder 7 is returned to the oil tank 9. Reference numeral 10 denotes a non-leak valve attached to the ascending cylinder 6. When the operating valve 8 is switched to the left/right switching position as described above, it is switched to the right switching position in FIG. It is constructed so that when the switching position is switched to the neutral position, the switching position is switched to the left switching position in FIG. 11 is a control circuit for loading work, unloading work, switching, etc. 12 is a garbage discharge control circuit that discharges the loaded garbage at the destination when the loading operation is completed, and is connected to the operating valve 8 and the non-leak valve 10;
The lift operation of the garbage input box 4 and the dump operation of the garbage storage box 3 are controlled during garbage discharge. 13 is driver's cabin 5
A dust discharge operation switch is provided in the dust discharge control circuit 12 and is connected to the dust discharge control circuit 12, whereby the dust discharge operation is performed via the dust discharge control circuit 12. 14 is an engine key provided in the driver's cab 5, and is connected to the garbage loading control circuit 11. 15 is a battery provided in the chassis 2, and is connected to the engine key 14.

Problems to be Solved by the Invention Incidentally, the lifting cylinder locking mechanism of the above-mentioned garbage collection vehicle does not have a means for easily detecting the locked state of the lifting cylinder 6, and as a result, workability may be reduced or There were shortcomings that could lead to incorrect operation.

Means for Solving the Problems In view of the above-mentioned problems, this invention is designed to provide a lifting cylinder that lifts the garbage input box relative to the garbage storage box, and locks the piston rod when the piston of the lifting cylinder moves in and out. In the lifting cylinder locking mechanism of a garbage collection vehicle, which is equipped with an integrated locking mechanism and a locking cylinder designed to release the locking of the piston rod, a pressure switch is applied to the locking cylinder to raise the garbage box. To provide a lock detecting device for a cylinder, which is connected to a limit switch that closes when the cylinder is closed, connected to a battery via the pressure switch, and also connected to a pilot lamp.

Operation According to this invention, the hydraulic pressure in the lock release cylinder is detected by a pressure switch, and the pressure switch lights up the pilot lamp to notify the locked state of the lift cylinder.

Embodiment An embodiment of this invention will be described below with reference to FIGS. 1 and 2.

Fig. 1 is a schematic diagram of a garbage collection vehicle showing a rising cylinder lock mechanism equipped with a cylinder lock detection device according to this invention, and Fig. 2 is a hydraulic and electrical circuit diagram of the rising cylinder lock mechanism shown in Fig. 1. The same reference numerals as in FIGS. 3 and 4 indicate the same members, and their explanations will be omitted. In the figure, reference numeral 16 denotes a limit switch connected to the battery 15 via a fuse 17, which is disposed at a predetermined location of the garbage disposal box 4 and opens when the garbage disposal box 4 is in the lowered state, that is, in the closed state. , when the garbage input box 4 is in a raised state, that is, in an open state. 18 is a pressure switch connected to the limit switch 16 and the lock release cylinder 7, which electrically detects the pressure inside the lock release cylinder 7, and detects a state where no hydraulic pressure is applied to the lock release cylinder 7;
That is, when the rising cylinder 6 is in the locked state, it closes;
It opens when the lock release cylinder 17 is loaded with hydraulic pressure, that is, when the lift cylinder 6 is in the unlock state. Reference numeral 19 denotes a pilot lamp connected to the pressure switch 18, which is disposed at a predetermined portion of the garbage input box 4 and lights up when no hydraulic pressure is applied to the lock release cylinder 7, and when the lift cylinder 6 is in the locked state. Show that.

As described above, the cylinder lock detection device according to the present invention detects the hydraulic pressure of the lock release cylinder 7 which releases the lock of the ascending cylinder 6 using the pressure switch 18, and lights the pilot lamp 19 using the pressure switch 18. Since the locked state of the lifting cylinder 6 is notified by the operator, the operator can easily confirm this.

Furthermore, since the cylinder lock detection device according to this invention has a circuit directly connected to the battery 15, it operates even when the engine key 14 is not inserted.

Furthermore, the cylinder lock detection device according to this invention has a limit switch 16 that locks the garbage input box 4.
Since the pilot 19 will not operate unless it is in the raised state, that is, in the closed state, the pilot 19 lights up only when necessary, even if the raising cylinder 6 is in the locked state.

Effects of the invention According to this invention, since the locked state of the cylinder can be easily confirmed, the operation can be performed quickly and accurately, leading to improved work efficiency and eliminating the fear of the operation.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of a garbage collection vehicle showing a rising cylinder lock mechanism equipped with a cylinder lock detection device according to this invention, Fig. 2 is a hydraulic and electrical circuit diagram of the rising cylinder lock mechanism shown in Fig. 1, and Fig. 3 The figure is a schematic diagram of a garbage collection vehicle showing the ascending cylinder lock mechanism previously proposed by the applicant, and FIG. 4 is a hydraulic and electrical circuit diagram of the ascending cylinder lock mechanism shown in FIG. 6... Lift switch, 7... Lock release cylinder, 16... Limit switch, 18... Pressure switch, 19... Pilot lamp.

Claims (1)

[Scope of utility model registration request] The lifting cylinder that lifts the garbage input box relative to the garbage storage box is provided with a lock mechanism that locks the piston rod when the piston of the lifting cylinder moves in and out, and a lock mechanism that releases the lock of the piston rod. In the lifting cylinder lock mechanism of a garbage collection vehicle equipped with an integrated lock release cylinder, a pressure switch is connected to the lock release cylinder, and the pressure switch is connected to the battery via a limit switch that closes when the garbage input box is raised. A cylinder lock detection device characterized by being connected to a pilot lamp as well as to a pilot lamp.