JPH0444499Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for adjusting a hydraulic cylinder of a walking beam type conveyance mechanism.

[Conventional technology]

A walking beam type conveyance mechanism driven by a hydraulic cylinder has been known (Japanese Utility Model Publication No. 58-37858). This walking beam type transport mechanism is equipped with an elevating cylinder device that raises and lowers a plurality of parallel beams, and a reciprocating cylinder device that moves the beams back and forth, and controls the operation of each cylinder device in a predetermined order. The objects on the beam are sequentially transported. The beam is supported by two sets of transport beds, and the cylinder device that raises and lowers and reciprocates these transport beds is actually composed of a pair of hydraulic cylinders for both raising and lowering and reciprocating. By operating each pair of hydraulic cylinders at the same time, the transport bed is sequentially raised and lowered and reciprocated.

FIG. 3 is an explanatory diagram showing a simplified conventional configuration for simultaneously operating a pair of hydraulic cylinders of an elevating cylinder device, in which two hydraulic cylinders 102 and 10
4, one chamber 102a (left side in the figure) of one cylinder 102 (upper side in the figure) and a chamber 104b (right side in the figure) opposite to the chamber 102a of the other cylinder 104 (lower side in the figure) are connected to each other. line 106,1
08 to the hydraulic unit 110. Further, each of the other chambers 102b, 104a is connected by a sealed crossover line 112, and inside these chambers 102b, 104a and the crossover line 112, both cylinders 102, 104a are connected.
Oil is sealed in an amount that allows the four pistons 102c and 104c to move in the same direction at the same time. Furthermore, a piston 1 is provided in the lower cylinder 104 in the figure.
Two limit switches 114 and 116 are provided to detect the forward end and the backward end of 04c, respectively.

In the device having the above configuration, for example, the hydraulic unit 1
When oil is supplied from 10 to the right chamber 104b of the lower cylinder 104, the piston 104c moves to the left, and the oil in the left chamber 104a flows into the crossover line 1.
12 and the right ventricle 102 of the upper cylinder 102
b, and moves the piston 102c in the same direction as the piston 104c.

If the amount of oil sealed in the crossover line 112 and the two chambers 102b, 104a connected by this line 112 is maintained constant, both cylinders 102, 104 operate in the same way. The sealed oil may increase or decrease due to internal leakage of the cylinders 102, 104 themselves or leakage from piping joints. In this case, the pistons 102c and 104c do not move to the specified amount, and for example, when the oil amount increases, the pistons 102c and 104c
As shown in the figure, the left limit switch 114 is not pressed, and conversely, when the oil level decreases, the right limit switch 116 is not pressed, and the signal to operate the reciprocating cylinder device (not shown) is not output, so the device is activated. It stops. Further, if the two cylinders 102 and 104 for lifting and lowering have different moving amounts, the beam may tilt, which is dangerous.

Therefore, conventionally, limit switches 114, 11
The chamber 104a on the transition line 112 side of the cylinder 104 in which the cylinder 6 is installed and the supply/discharge line 108 from the hydraulic unit 110 are connected via a manual valve 118 as shown in the figure. Corrections were made by replenishing or draining oil.

[The problem that the idea aims to solve]

In the above-mentioned conventional configuration, the operation was complicated because the adjustment was performed manually. In particular, in the walking beam transport mechanism, the lifting cylinder device and the reciprocating cylinder device are operated alternately, so the reciprocating cylinder device must also be operated during the adjustment process, so manual adjustment is extremely difficult. It was time consuming and there was a risk of erroneous operation.

The present invention has been made to eliminate such drawbacks, and provides a hydraulic cylinder adjustment device for a walking beam type conveyance mechanism that can automatically adjust the amount of oil in the crossover line.

[Means to solve the problem]

The hydraulic cylinder adjustment device for a walking beam type transport mechanism according to the present invention comprises a lifting cylinder device for lifting and lowering a plurality of beams arranged in parallel, a reciprocating cylinder device for reciprocating the beams, and a control means for controlling the operation of these cylinder devices in a predetermined sequence, and the lifting cylinder device is composed of a pair of hydraulic cylinders arranged in parallel, one chamber of one hydraulic cylinder and the chamber opposite to the above chamber of the other cylinder are connected to a hydraulic source via supply and discharge lines, and the two chambers of both cylinders that are not connected to the hydraulic sources are connected by a sealed crossover line, and oil is supplied to the chamber of one of the hydraulic cylinders. This walking beam type conveying mechanism is designed to send oil from one chamber into the chamber of the other cylinder via a crossover line, thereby operating the pistons of both hydraulic cylinders simultaneously in the same direction. The mechanism is equipped with a detector that detects both operating ends of either hydraulic cylinder, a check circuit that outputs an abnormality signal when a signal from the detector is not input within a specified time, and a correction circuit that connects the inside of a sealed space consisting of the crossover line and the two chambers connected by this line to a hydraulic source via an electromagnetic switching valve, and an abnormality signal from the check circuit operates the electromagnetic switching valve to replenish or discharge oil into the sealed space.

[Effect]

In the hydraulic cylinder adjustment device for the walking beam type conveyance mechanism according to the present invention, when the amount of oil sealed in the crossover line and the two chambers increases or decreases and normal operation is no longer possible, the system automatically adjusts the hydraulic cylinder through the correction circuit. Oil is replenished or drained and normal operation is restored.

〔Example〕

The present invention will be explained below with reference to illustrated embodiments. FIG. 1 is a circuit diagram showing the main parts of a hydraulic cylinder adjustment device for a walking beam type conveyance mechanism according to an embodiment of the present invention. In the figure, 2 indicates a pair of hydraulic cylinders 4 and 6 arranged in parallel. This is an elevating cylinder device consisting of: These two hydraulic cylinders 4,
One chamber 4a (left side in the figure) of one of the hydraulic cylinders 4 (upper side in the figure) is connected to a pump 12 via a supply/discharge line 8 and an electromagnetic switching valve 10. According to the above chamber 4
Oil can be supplied into the chamber 4a, and the oil can be discharged from the chamber 4a. A chamber 6b of the other hydraulic cylinder 6 on the opposite side to the chamber 4a (right side in the figure)
Similarly, it is connected to the pump 12 via the supply/discharge line 14 and the electromagnetic switching valve 16, and the oil in the chamber 6b is supplied and discharged. These two solenoid valves 10, 16
is operated by a normal operation signal sent from a check circuit of a reciprocating cylinder device (not shown).

The chambers 4b and 6a of both hydraulic cylinders 4 and 6 other than the chambers 4a and 6b connected to the pump 12 are connected by a crossover line 18. A sealed space consisting of these two chambers 4b, 6a and the crossover line 18 contains an amount of oil that can move the pistons 4c, 6c of both hydraulic cylinders 4, 6 in the same direction at the same time. There is. Therefore, the chamber 4a of one of the hydraulic cylinders, for example the upper hydraulic cylinder 4, is connected to the pump 12.
When oil is supplied into the hydraulic cylinder 6, the piston 4c moves to the right, and the oil in the right chamber 4b of the hydraulic cylinder 4 is sent to the left chamber 6a of the hydraulic cylinder 6 below through the crossover line 18, and the oil is sent to the left chamber 6a of the hydraulic cylinder 6 below, and the oil is transferred to the left chamber 6a of the hydraulic cylinder 6 below. is moved to the right at the same time as the piston 4c, and the oil in the right chamber 6b is discharged from the supply/discharge line 14.

The lower hydraulic cylinder 6 is provided with first and second limit switches 20 and 22 for detecting when the piston 6c has reached its moving ends on both sides. These limit switches 20, 22
sends a detection signal to the check circuit 24 when detecting that the piston 6c has reached the moving end.
The check circuit 24 receives detection signals from the limit switches 20 and 22 and a signal from a timer circuit (not shown). The timer circuit measures a preset time, and if the detection signals from the limit switches 20 and 22 are input within this set time, the check circuit 24 outputs a normal signal and the reciprocating cylinder device (not shown) is activated. Activate the solenoid switching valve. Furthermore, when the detection signals from the limit switches 20 and 22 are not input within the set time, the check circuit 24 outputs an abnormality signal.

Further, the crossover line 18 is connected to the supply/discharge line 2
5 and the pump 12 via an electromagnetic switching valve 26. A correction circuit 28 is configured by the supply/discharge line 25 and the electromagnetic switching valve 26.
When an abnormality signal is output from the check circuit 24, the electromagnetic switching valve 26 is operated to replenish oil into the crossover line 18 or drain oil from the crossover line 18.

In the device having the above configuration, the crossover lines 18 and 2
When the amount of oil sealed in the sealed space consisting of two chambers 4a and 6b is kept constant, the pistons 4c of the two hydraulic cylinders 4 and 6,
6c simultaneously moves in the same direction, reaches its end of movement and presses the limit switch 20 or 22,
Perform normal operation alternately with reciprocating cylinder device.

As shown by the arrows in FIG. 1, the pistons 4c, 6
c Due to internal leakage from the surrounding area or leakage from piping connections, the crossover line 18 and the two chambers 4a and 6b
If there is a shortage of oil in the sealed space consisting of
The piston 6c does not reach the end of movement and does not press the second limit switch 22. As a result, the check circuit 24 outputs an overtime abnormality signal i, and the electromagnetic switching valve 26 of the correction circuit 28 is operated to replenish oil in the sealed space until the second limit switch 22 is pressed. Thereafter, it returns to normal operation and operates alternately with the reciprocating cylinder device.

Further, as shown in FIG. 2, hydraulic cylinders 4,
When the oil in the sealed space increases due to internal leakage of the hydraulic cylinder 6, even if the piston 4c of the upper hydraulic cylinder 4 reaches the left end of movement, the piston 6c of the lower hydraulic cylinder 6 moves to the left end. No, 1st
Do not press limit switch 20. In this case, the electromagnetic switching valve 26 of the correction circuit 28 is actuated by the abnormality signal i from the check circuit 24, and the piston 6c of the lower hydraulic cylinder 6 reaches the left end of movement, and the first limit switch 20 is activated. Drain the oil from the crossover line 18 until you press . In this way, with the device of this embodiment, when the amount of oil sealed in the crossover line and the chamber connected by this line increases or decreases, it can be automatically adjusted, so manual adjustment is no longer necessary. It is not complicated and also eliminates the risk of erroneous operation.

[Effect of idea]

As described above, according to the present invention, the hydraulic cylinder of the walking beam type conveyance mechanism can be automatically adjusted.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing an elevating cylinder device of a walking beam type conveyance mechanism according to an embodiment of the present invention, Fig. 2 is a diagram showing different operating states of the device of Fig. 1, and Fig. 3 is a diagram of a conventional device. FIG. 2 is a circuit diagram showing the same portion as FIG. 1; 2... Lifting cylinder device, 4, 6... Hydraulic cylinder, 8, 14... Supply/discharge line, 12... Hydraulic source, 18... Transition line, 20, 22... Detector, 24... Check circuit, 26... Solenoid switching valve, 28... Correction circuit.

Claims (1)

[Scope of utility model registration request] A lifting cylinder device that lifts and lowers a plurality of beams arranged in parallel, a reciprocating cylinder device that moves the beams back and forth, and a control means that controls the operation of these cylinder devices in a predetermined order. Consisting of a pair of hydraulic cylinders arranged in parallel, one chamber of one hydraulic cylinder and the chamber on the opposite side of the chamber of the other cylinder are connected to a hydraulic power source via supply and discharge lines, and both cylinders are 2 not connected to the hydraulic power source.
By connecting the two chambers with a sealed crossover line and supplying oil to the chamber of either one of the hydraulic cylinders, the oil in the other chamber can be sent to the chamber of the other cylinder via the crossover line, and both hydraulic In a walking beam conveyor mechanism in which the pistons of the cylinders are operated simultaneously in the same direction, there is a detector that detects both working ends of one of the hydraulic cylinders, and when a signal from the detector is not input within a predetermined time. A check circuit that outputs an abnormal signal to the above-mentioned check circuit, and a correction circuit that connects the inside of the sealed space consisting of the above-mentioned crossover line and two chambers connected by this line to a hydraulic power source via an electromagnetic switching valve. A walking beam type conveyance mechanism characterized in that the moving amount of the pistons of both the hydraulic cylinders is made equal by actuating an electromagnetic switching valve in response to an abnormal signal from the hydraulic cylinder to replenish or discharge oil into the sealed space. Hydraulic cylinder adjustment device.