JP2016182629A - Crank press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a user to cope with a fault immediately and properly without any trouble, even when the fault occurs at a switching valve for actuating a clutch, in a crank press having a crankshaft and a flywheel connected by the clutch.SOLUTION: At a path where air is supplied to a clutch actuated by air pressure, there are provided two switching valves 26 in parallel, for switching the air pressure to be applied to the clutch. Even when one of the switching valves 26 is disabled by trouble or the like, the clutch is actuated by the other of the switching valves 26, enabling pressing operation to be continued. There is also provided a monitoring mechanism 50 for detecting displacement of valve bodies (a lower valve body 46 and an upper valve body 45) of each switching valve 26 by a displacement sensor 52, and comparing the detection results, thus monitoring the synchronization status of operation of the respective switching valves 26. This structure enables a user to immediately detect abnormality when the switching valves 26 cease to operate in synchronization with each other, and to cope with the abnormality properly.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a crank press that performs a pressing operation by rotating a crankshaft.

  A crank press revolves a slide connected to a crankshaft by a connecting rod (connecting rod) with a predetermined stroke by rotating a crankshaft that is rotatably supported at both ends of the press body. A press work is performed by applying a pressure to (molded material), and a crankshaft and a flywheel that is rotationally driven by a motor are often connected by a clutch that is operated by a fluid pressure such as air.

  In a crank press using a clutch that operates with fluid pressure as described above, normally, the clutch is operated by switching the fluid pressure to be applied to the clutch with a switching valve provided in the fluid supply path to the clutch. The flywheel is connected and disconnected. By providing a plurality of switching valves in parallel, even if one of the switching valves stops operating due to a failure or the like, the clutch can be operated normally with the other switching valve, causing major troubles such as deformation or breakage of parts. The press work can be continued without generating it (see, for example, Patent Document 1).

JP 2012-6057 A

  However, when a plurality of switching valves for operating the clutch are provided in parallel as in the crank press described in Patent Document 1, if the switching valves do not operate accurately in synchronization, the crankshaft and the fly Switching between connection and disconnection of the wheel cannot be performed smoothly, which may hinder the press work.

  Accordingly, the present invention enables a proper action to be taken immediately in a crank press in which a crankshaft and a flywheel are connected by a clutch without causing any trouble even if a problem occurs in a switching valve that operates the clutch. This is the issue.

  In order to solve the above problems, the present invention connects a crankshaft rotatably supported at both ends to a press main body and a flywheel that is driven to rotate by a motor by a clutch that operates by fluid pressure, In the crank press that performs press work by rotating the crankshaft by transmitting the rotational torque of the flywheel to the crankshaft by the clutch, the fluid pressure applied to the clutch is switched to the fluid supply path to the clutch. A plurality of switching valves to be performed are provided in parallel, and a monitoring mechanism for monitoring the synchronized state of the operation of each switching valve is employed.

  In other words, by providing multiple parallel switching valves for switching the fluid pressure applied to the clutch in the fluid supply path to the clutch that operates with fluid pressure, even if one of the switching valves stops operating due to a failure, etc. The press work can be continued without causing any problems, and by constantly monitoring the synchronized state of the operation of each switching valve, when the switching valves stop operating in synchronization, the abnormality can be detected immediately. By taking measures such as interrupting the press work, troubles can be prevented in advance.

  Here, the monitoring mechanism may employ a mechanism that detects the operation timing of each switching valve with a proximity switch and compares the detection results.

  In addition, if a mechanism that detects the displacement of the valve body of each switching valve with a displacement sensor and compares the detection results is adopted as the monitoring mechanism, the difference in movement of each switching valve can be grasped in detail, and more appropriate. Will be able to take a good response.

  As described above, the crank press according to the present invention is provided with a plurality of switching valves for switching the fluid pressure applied to the clutch in parallel, and a monitoring mechanism for monitoring the synchronized state of the operation of each switching valve. Therefore, even if any of the switching valves stops due to a failure or the like, or the switching valves do not operate in synchronization with each other, an appropriate response can be taken before a major trouble occurs. Therefore, components such as a crankshaft that receive a large impact each time a pressing operation is performed can be used safely for a long time without being deformed or damaged.

Overall configuration diagram of crank press of embodiment Front sectional drawing of the principal part of the air pressure supply device of FIG. Top view of FIG. Sectional view along line IV-IV in FIG. Sectional drawing explaining operation | movement of an air pressure supply apparatus corresponding to FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the crank press has a crankshaft 3 and flywheel 11 that are supported at both ends by a side frame 2 of a press body 1 and are coaxially arranged. Are connected by a clutch 14. The clutch 14 is operated by air pressure as fluid pressure supplied from the air pressure supply device 20.

  In the press body 1, an upper frame 4 and a lower frame 5 are connected by a tie rod 6 and a nut 7 with the side frames 2 on both sides being sandwiched. A slide 8 is connected to a central portion in the longitudinal direction of the crankshaft 3 by a connecting rod 9, and a bolster 10 is fixed to the upper surface of the lower frame 5. As the crankshaft 3 rotates, the slide 8 reciprocates up and down with a constant stroke, and the workpiece is machined by upper and lower molds (not shown) attached to the slide 8 and the bolster 10. ing.

  The flywheel 11 is connected to a motor 12 serving as a drive source by a belt 13. The clutch 14 includes a piston-type cylinder 14a to which air pressure is applied from the air pressure supply device 20, and a friction plate 14b attached to the crankshaft 3. The flywheel 11 is attached to the friction plate 14b by the cylinder 14a. And the rotational torque of the flywheel 11 is transmitted to the crankshaft 3.

  Strain detectors 31 are attached to the side frames 2 on both sides of the press body 1. Each strain detection device 31 is connected to a load meter amplifier 33 by a signal cable 32 a, and the strain detected by the strain detection device 31 is converted into a press load by the load meter amplifier 33. The load meter amplifier 33 is connected to the controller 34, and the controller 34 is connected to the air pressure regulator 23 of the air pressure supply device 20 via signal cables 32 b and 32 c, respectively. A set value of air pressure is determined based on the press load, and the set value of air pressure is instructed to the air pressure regulator 23.

  The air pressure supply device 20 includes an air pressure regulator 23 that adjusts the air pressure and an air tank 24 that stores air of the air pressure adjusted by the air pressure regulator 23 in an air supply path 22 a from the air source 21 to the clutch 14. Then, the switching valve 26 driven by the electromagnetic valve 25 is arranged in order. A pressure gauge 27 is attached to the supply path 22 a on the outlet side of the air pressure regulator 23, and a safety valve 28 is attached to the air tank 24. Then, the air pressure of the air tank 24 adjusted by the air pressure regulator 23 according to the instruction from the controller 34 is supplied to the clutch 14 via the switching valve 26. The switching valve 26 is also connected to the outside via a silencer 29.

  The electromagnetic valve 25 of the air pressure supply device 20 drives the switching valve 26 using the air supplied from the air source 21 through the bypass path 22b. The electromagnetic valve 25 and the switching valve 26 are arranged in parallel two by two. Even if one of the switching valves 26 stops operating due to a failure or the like, the pressing operation can be continued without causing any major trouble.

  2 to 4 show a structure in the vicinity of the switching valve 26 of the air pressure supply device 20. In this embodiment, the two switching valves 26 have a common valve box 41, and two electromagnetic valves 25 and a sequencer 51 are attached to the upper surface of the valve box 41.

  The valve box 41 is provided with one inflow port 41a connected to the air tank 24 on the front surface and one outflow port 41b connected to the cylinder 14a of the clutch 14 on the rear surface, one for each of the two switching valves 26, Discharge ports 41c connected to the outside are provided on both side surfaces. Further, the upper chamber 42, the intermediate chamber 43, and the lower chamber 44 are formed one by one with respect to one switching valve 26 inside the valve box 41. Each upper chamber 42 communicates with the outlet 41c, each intermediate chamber 43 communicates with the outlet 41b, and each lower chamber 44 communicates with the inlet 41a.

  In each switching valve 26, an upper valve body 45 provided in the upper chamber 42 of the valve box 41 and a lower valve body 46 provided in the lower chamber 44 are connected by a connecting shaft 47, and can be slid vertically. It is supported by. A biasing spring 48 that abuts on the lower surface side of the lower valve body 46 biases the upper valve body 45 and the lower valve body 46 in the direction of pushing up integrally. The lower chamber 44 of the valve box 41 is provided with a cylindrical filter 49 that divides the inside of the lower chamber 44 into two around the lower valve body 46.

  A displacement sensor 52 that detects the displacement of the lower valve body 46 (and the upper valve body 45 that moves up and down integrally with the lower valve body 46) is provided below the lower valve body 46 of each switching valve 26. Is connected to the sequencer 51 by a signal cable 53. Thereby, the monitoring mechanism 50 which compares the detection result of each displacement sensor 52 with the sequencer 51, and monitors the synchronous state of operation | movement of each switching valve 26 is comprised.

  Each electromagnetic valve 25 shuts off the air supplied from the air source 21 through the bypass path 22b in the OFF state, and when turned on, the air from the air source 21 is allowed to flow into the upper chamber from the upper surface of the valve box 41 of the switching valve 26. 42 is sent.

  When each electromagnetic valve 25 is in the OFF state (the state shown in FIGS. 1, 2, and 4), the upper valve body 45 and the lower valve body 46 of each switching valve 26 are pushed up by the urging spring 48, The upper valve body 45 is opened to allow the upper chamber 42 and the intermediate chamber 43 to communicate with each other, and the lower valve body 46 is closed to establish a connection between the intermediate chamber 43 and the lower chamber 44 of the valve box 41. Block the gap. Thereby, the air supplied from the air tank 24 to the inlet 41a of the valve box 41 through the air supply path 22a does not flow from the lower chamber 44 to the intermediate chamber 43, and a predetermined air pressure is not applied to the cylinder 14a of the clutch 14. . Accordingly, at this time, the flywheel 11 is not connected to the crankshaft 3 and does not transmit rotational torque to the crankshaft 3.

  On the other hand, when each electromagnetic valve 25 is turned on, air is sent into the upper chamber 42 from the upper surface of the valve box 41 of the switching valve 26 as described above. Then, as shown in FIG. 5, the upper valve body 45 and the lower valve body 46 of each switching valve 26 resist the elasticity of the urging spring 48 by the air sent to the upper part of the upper chamber 42 of the valve box 41. The lower valve body 46 is opened and the intermediate chamber of the valve box 41 is opened while the upper valve body 45 is closed and the upper chamber 42 and the intermediate chamber 43 are shut off. 43 communicates with the lower chamber 44. Thereby, the air supplied from the air tank 24 to the inlet 41a of the valve box 41 flows from the lower chamber 44 to the intermediate chamber 43 through the filter 49 of the lower chamber 44, and from the intermediate chamber 43 through the outlet 41b to the clutch. 14 cylinders 14a. Therefore, at this time, a predetermined air pressure is applied to the cylinder 14a of the clutch 14 so as to press the flywheel 11 against the friction plate 14b, and the flywheel 11 is connected to the crankshaft 3 to rotate torque to the crankshaft 3. Will come to communicate.

  Further, when each electromagnetic valve 25 is switched from ON to OFF, the air in the cylinder 14 a of the clutch 14 flows backward to the outlet 41 b of the valve box 41. At this time, as described above, the upper valve body 45 is opened and the intermediate chamber 43 and the upper chamber 42 are communicated with each other. Therefore, as shown by a two-dot chain line in FIG. Flows to the discharge port 41c through the intermediate chamber 43 and the upper chamber 42, and is discharged to the outside through the silencer 29 from the discharge port 41c. As a result, the air pressure in the cylinder 14a of the clutch 14 becomes smaller than a predetermined value (substantially equal to the atmospheric pressure), the flywheel 11 returns to the initial position, and the connection between the flywheel 11 and the crankshaft 3 is disconnected. .

  This crank press has the above-described configuration, and two switching valves 26 for switching the air pressure applied to the clutch 14 are provided in parallel in the air supply path 22 a from the air source 21 to the clutch 14. Even if the changeover valve 26 stops moving due to a failure or the like, the clutch 14 can be operated normally with the other changeover valve 26, and the pressing operation can be continued without causing any major trouble.

  Further, since the monitoring mechanism 50 for monitoring the synchronized state of the operation of each switching valve 26 is provided, even if the switching valves 26 do not operate in synchronization with each other, the abnormality can be detected immediately and the press work is interrupted. By taking measures such as this, troubles can be prevented. Moreover, since the monitoring mechanism 50 employs a mechanism that detects and compares the displacement of the lower valve body 46 (and the upper valve body 45) of each switching valve 26, the difference in the movement of each switching valve 26 is detected. It can be grasped in detail by monitoring or the like, and an appropriate response can be taken according to the state of occurrence of the abnormality.

  As for the monitoring mechanism, it is desirable to compare the displacement of the valve body of each switching valve as in the embodiment described above, but the operation timing of each switching valve is detected by a proximity switch provided instead of the displacement sensor of the embodiment. And what compares the detection result is also employable.

DESCRIPTION OF SYMBOLS 1 Press main body 3 Crankshaft 8 Slide 9 Connecting rod 10 Bolster 11 Flywheel 12 Motor 14 Clutch 20 Air pressure supply device 22a Air supply path 25 Solenoid valve 26 Switching valve 41 Valve box 45 Upper valve body 46 Lower valve body 47 Connection shaft 50 Monitoring Mechanism 51 Sequencer 52 Displacement sensor 53 Signal cable

Claims (3)

A crankshaft that is rotatably supported at both ends by the press body and a flywheel that is driven to rotate by a motor are connected by a clutch that operates by fluid pressure, and the rotational torque of the flywheel is transmitted to the crankshaft by the clutch. In a crank press that performs a pressing operation by rotating the crankshaft,
A plurality of switching valves for switching the fluid pressure applied to the clutch are provided in parallel in the fluid supply path to the clutch, and a monitoring mechanism for monitoring the synchronized state of the operation of each switching valve is provided. Crank press.   2. The crank press according to claim 1, wherein the monitoring mechanism detects an operation timing of each switching valve with a proximity switch and compares the detection results.   The crank press according to claim 1, wherein the monitoring mechanism detects a displacement of the valve body of each switching valve by a displacement sensor and compares the detection results.

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