JP2006207712A - Variable speed pneumatic action mechanism using pneumatic cylinder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To build up a variable speed pneumatic action mechanism in a simple mechanism, in which its action speed of a pneumatic cylinder is reduced in front of its action end while the pneumatic cylinder is operating and the pneumatic cylinder reaches the action end at reduced speed; to restrain costs of facilities and remodeling costs at a low level when a variable speed mechanism is added on an existing pneumatic system; and to remove residual pressure in a pnuematic pipe. <P>SOLUTION: An electromagnetic valve, which can switch ventilating and a neutral state while ventilating haldway in the non-exciting state of the valve, is arranged halfway in a passage of the pipe leading to the pneumatic cylinder driven by the electromagnetic valve which is in a neutral state at the exciting state of the valve capable of switching its ventilation in a ventilating direction, a neutral direction, and a reverse direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a variable speed pneumatic operation mechanism using a pneumatic cylinder.

  A mechanism for operating a cylinder with a fluid pressure such as hydraulic pressure, water pressure, and air pressure is widely used in the world because a large force can be obtained by the Pascal principle by increasing the cross-sectional area of the cylinder.

  Hydraulic pressure and water pressure, which are incompressible fluids, can exert a greater force, have better responsiveness and stopping accuracy, and, in the case of hydraulic pressure, are suitable for preventing corrosion of piping. However, in the case of these hydraulic pressures, there is a hassle to make the entire piping system closed, collect the fluid for operation, and prevent leakage.

  In comparison, air pressure has a weakness that it can exert less force than hydraulic pressure, and because it uses a compressible fluid called air, its operation responsiveness and stopping accuracy are slightly inferior. It is not necessary to make the entire piping system closed, and there is no need for a design that collects the working fluid and prevents leakage, so that the equipment cost is low and maintenance is possible as long as the power that can be demonstrated is sufficient There is also an advantage that it is easy.

  By the way, a pneumatic cylinder is sometimes used to move an object having a weight as large as several tons. However, when the pneumatic cylinder is moved to the operating end, the object is suddenly stopped. In order to prevent damage to the cylinder and damage caused by the object colliding with another nearby object (including overruns due to inertia and vibration) There is a technical demand to reduce the operating speed before this, and to reach the operating end at the reduced speed. A pneumatic cylinder provided with a cushion mechanism is generally used, but its action is not sufficient.

  The speed adjustment for reducing the operating speed of the pneumatic cylinder is generally performed by a speed adjustment valve, which is provided in the middle of the flow path of the pipe exhausted from the pneumatic cylinder, by a speed adjustment valve composed of a throttle valve and a check valve. This is done by adjusting the flow rate of air discharged from the air.

  As a method of reducing the operating speed of the pneumatic cylinder in the middle of the operation and before the operating end, a piston rod of the operating air cylinder is operated by a hydraulic speed control device as in Patent Document 1. In addition, there is a method of reducing the operation speed by applying a load due to the viscosity of the liquid.

  Japanese Patent Application Laid-Open No. 2003-228561 will be described with reference to FIG. 3, but a three-position switchable solenoid valve 12 interposed between a pressure air supply source 10 and a pneumatic cylinder 11 and a drive switch solenoid valve. 12 and a cushion switching solenoid valve 15 interposed between the pressure air supply source 10 and the pneumatic cylinder 11 in parallel with each other, and a first exhaust port 15d with respect to a first switching position of the cushion switching solenoid valve 15. A first exhaust pressure adjusting valve 16A connected to the second exhaust pressure adjusting valve 16B connected to the second exhaust port 15e with respect to the second switching position of the cushion switching electromagnetic valve 15, and driven. At the first direction switching position of the switching solenoid valve 12, the second exhaust port 15e is connected to the atmosphere, and at the second direction switching position, the first exhaust port is connected. A pneumatic cylinder speed control device is described in which the air connection of the exhaust ports 15d and 15e through the drive switching solenoid valve 12 is cut off at the neutral position of the drive switching solenoid valve 12 at the neutral position. Has been.

It should be noted that Patent Document 3 relating to a device for correcting uneven winding of a metal plate coil, which appears in an example described later, is cited here.
JP 09-108966 A Japanese Utility Model Publication No. 05-058903 Japanese Patent Laid-Open No. 06-015355

  However, since the method as in Patent Document 1 requires a hydraulic system such as a hydraulic speed control device in addition to the pneumatic system, the hydraulic system needs to be closed, and the hydraulic pressure for operation A design to recover oil and prevent leakage is required, which ultimately results in high equipment costs and maintenance.

  In addition, in the device as in Patent Document 2, since the residual pressure remains in the pneumatic piping, even if the pump or the compressor that is the pneumatic supply source is stopped, the operation switch circuit is mistakenly caused by condensation or the like. When a short circuit occurs and at least one solenoid valve is operated, the pneumatic cylinder is operated although it is not desired to operate, which causes a safety problem.

  Furthermore, there is also a problem that when the variable speed function is to be added to the existing pneumatic system, the modification cost is high, such as the entire valve stand needs to be renewed or greatly modified.

  The present invention has been made to solve the problems of the prior art as described above. In other words, according to the present invention, ventilation and neutral can be switched in the middle of a flow path of a pipe that leads to a pneumatic cylinder driven by a non-excited neutral solenoid valve that can switch between ventilation and neutral and reverse ventilation. The operation speed of the pneumatic cylinder is made variable by providing a solenoid valve that is vented during excitation.

  According to the present invention, a variable speed pneumatic operation mechanism that reduces the operation speed of the pneumatic cylinder in the middle of the operation and before the operation end and reaches the operation end at the reduced speed is a simple mechanism. In addition, the equipment and remodeling costs can be kept low, including when trying to add a variable speed function to an existing pneumatic system, and there is no residual pressure remaining in the pneumatic piping.

  An example in which the present invention is applied to the apparatus for correcting uneven winding of a metal plate coil shown in FIG. 1 will be described below with reference to FIG. When the pneumatic cylinder 11 moves forward, the non-excited neutral solenoid valve 12 (so-called DS3P: Double Solenoid 3-Position) that can switch between ventilation, neutral and reverse ventilation is excited to the 12a side, that is, the ventilation state side. As a result, air flows into the head side 11 a of the pneumatic cylinder 11. The air on the rod side 11b of the pneumatic cylinder is discharged toward the atmosphere through the throttle valve 13B-a in the flow rate adjusting valve 13B. At the same time, it is discharged toward the atmosphere even if it passes through the throttle valve 18-a in the flow rate adjusting valve 18. Incidentally, by adjusting the flow rate of the flow rate adjusting valves 13B and 18, the speed level can be adjusted as a result.

  FIG. 1 depicts a state in which the pneumatic cylinder 11 moves forward to finally correct the coil winding irregularity of the metal plate coil. At first, the pneumatic cylinder 11 is in the retreat limit, and from that state, the pneumatic cylinder 11 (exactly The rod starts to advance).

  When the striker S is turned on to the speed switching position sensor L using the magnetic proximity switch while the pneumatic cylinder 11 continues to advance, the signal is transmitted to a control device (not shown), and on the side of the control device receiving it, the ventilation A command is sent to the solenoid valve 17 in a non-excited ventilation state (so-called SS2P: Single Solenoid 2-Position type) that can be switched between neutral and the solenoid valve 17 is excited to the 17a side, that is, the neutral state side. Then, the air on the rod side of the pneumatic cylinder 11 is discharged toward the atmosphere only through the throttle valve 13B-a in the flow rate adjustment valve 13B. Thus, by changing the total cross-sectional area of the pipe on the air discharge side by turning ON / OFF the speed switching position sensor L, it is possible to switch from high speed to low speed (variable speed).

  When the power of each solenoid valve 12 or 17 is turned off or a power failure occurs due to some trouble, the solenoid valves 12 and 17 are both in a non-excited state. However, in a non-excited state, the solenoid valve 12 is in a neutral state. That is, 12c is inserted into the pipe, and the solenoid valve 17 is inserted into the pipe on the 17b side, that is, the ventilation state side.

  For this reason, the pressure on the head side 11a and the rod side 11b of the pneumatic cylinder 11 is in a balanced state such that the pneumatic cylinder 11 does not operate, and the rod side 11b of the pneumatic cylinder 11 is the same as the atmospheric pressure. Become pressure.

  Thus, no residual pressure remains in the entire pneumatic system in FIG. This is different from the conventional one shown in FIG. Then, even when the operation switch circuit is accidentally short-circuited due to condensation or the like and at least one solenoid valve is operated, the pneumatic cylinder does not operate and it is safe.

  By the way, although two pneumatic cylinders are shown in FIG. 1, it goes without saying that the pneumatic cylinder side which has not appeared in the above description is structured in the same manner as in the above description.

  The embodiment described above is merely an example. For example, even if one or more of the flow rate adjusting valves 13A, 13B, and 18 are omitted as appropriate, the present invention is established and the control device is used. Even if automatic control is not performed, if the operator visually determines that the speed has been changed to a position where the speed should be switched to a low speed, the present invention is established even if the solenoid valve 17 is manually operated so that the 17a side is excited.

  Alternatively, as the speed switching position sensor, other sensors such as a mechanical limit switch, a laser sensor, and a phototube can be used in addition to the magnetic proximity switch.

  Furthermore, it goes without saying that the present invention is applicable not only to the coil winding irregularity correcting device 100 for metal plate coils but also to variable speed pneumatic operation mechanisms in general.

  The present invention was applied to the apparatus 100 for correcting uneven winding of a metal plate coil shown in FIG. The present apparatus corrects the coil winding irregularity by simultaneously pressing the addressing plate while pressing the uneven portion of the end face at the time of winding the metal plate coil 30 with the addressing plate 20 (object). The width dimension of the metal plate coil 30 changes for each metal plate coil 30 between 600 mm and 2000 mm. It is desirable that the coil winding irregularity can be corrected in as short a time as possible.

  That is, at first, the plate 20 is brought close to the end face of the metal plate coil 30 at a high speed, and the operation speed is lowered before the operation end in the middle of the operation, and reaches the operation end at the reduced speed. This is because it is necessary to bring the plate 20 into contact with the end surface of the metal plate coil 30 at a low speed so as not to damage the end surface of the metal plate coil 30.

  In FIG. 1, assuming that the total operation stroke of the pneumatic cylinder 11 is 1600 mm (high-speed moving section 900 mm, low-speed moving section 700 mm), a speed switching position sensor L is provided at a position 900 mm from the retreat limit. Here, a non-contact proximity switch is used as a sensor, but a contact sensor such as a limit switch may be used. The pneumatic system is a non-excited non-excited ventilator that can switch between venting and neutral to the existing basic pneumatic system of the non-excited neutral solenoid valve 12 and flow rate adjusting valves 13A and 13B that can switch between venting, neutral and reverse venting. A solenoid valve 17 and a flow rate adjustment valve 18 are additionally provided.

  Since it is only necessary to connect another pipe to the side of the pipe constituting the existing basic pneumatic system and connect the flow rate adjustment valve 18 and the electromagnetic valve 17 in a form of branching from the existing pipe, simple modification is sufficient. The cost of remodeling could be kept low. If the modification is made to the prior art as shown in FIG. 3, a piping for connecting the pressure air supply source 10 and the electromagnetic valve 15 and the two exhaust pressure adjusting valves 16A, B are required, so that more complicated modification is required. It would have been more expensive to remodel.

  As a result of adjusting the flow rate adjusting valves 13B and 18 so that the air pressure is 0.4 MPa, the high speed moving section can be moved at 300 mm / s, and the low speed moving section can be moved at 100 mm / s, 10 seconds which is a target of a desired required operation time I was able to clear. FIG. 2 schematically shows a speed pattern during forward movement.

  In the case of a pneumatic cylinder, since air is a compressible fluid, there is a concern that pressure hunting may occur due to a speed change during operation. However, if the speed ratio is about the same as this embodiment (about 3: 1), there is an effect. Was small and no problem.

The figure explaining one embodiment of this invention. The figure which shows typically the speed pattern at the time of operation | movement at the time of applying this invention. The figure explaining a prior art.

Explanation of symbols

11 Pneumatic cylinder 20 Address plate L Speed switching position sensor S Strike 12 Non-excited neutral solenoid valves 13A, 13B, 18 capable of switching between ventilation, neutral and reverse ventilation Flow rate adjusting valves 13A-a, 13B-a, 18 -A Throttle valves 13A-b, 13B-b, 18-b Check valve 17 Electromagnetic valve 30 capable of switching between ventilation and neutral 30 Metal plate coil 100 Coil winding irregularity correction device for metal plate coil (variable speed pneumatic operation mechanism)

Claims (1)

  A pneumatic operation mechanism that moves an object using a pneumatic cylinder, and is in the middle of a flow path of a pipe that leads to a pneumatic cylinder driven by a non-excited neutral solenoid valve that can switch between ventilation, neutral and reverse ventilation A variable speed pneumatic operation mechanism using a pneumatic cylinder characterized in that the operation speed of the pneumatic cylinder is variable by providing an electromagnetic valve in a non-excited ventilation state capable of switching between ventilation and neutral.

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