JP2016094234A - Compression type plug fastening method for drum can, and apparatus for the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a surrounding foreign matter from being sucked into a drum can at a plug opening time, by pressuring the inside of a drum can at a plug fastening step of the drum can.SOLUTION: In the state where a drum can D is positioned in both a transfer direction Q and a circumferential direction at a set position on a transfer line, paired plug drivers Gand Garranged just over said drum can D are moved downward, and a pair of large and small plugs Pand Pmounted on the top board 82 of the drum can D are screwed to seal by the rotations of said paired plug drivers Gand G. The individual plugs Pand Pare screwed while feeding compressed air to the inside of the drum can D from screw clearances 92 of said pair of large and small plugs Pand P.SELECTED DRAWING: Figure 4

Description

  TECHNICAL FIELD The present invention relates to a drum can pressure-type plug tightening method and apparatus for preventing peripheral foreign matter from being sucked into the drum can when the cap is opened.

  In a drum can production line, tightening a pair of large and small plugs is the final step. In the pre-process of the plug tightening process, there are a painting process, a baking process and the like. In the baking process, the temperature of the drum can is around 150 ° C. Therefore, in the plug tightening process, the temperature of the drum can is around 60 ° C. Doing that work. Therefore, when the temperature at the time of use such as filling the product inside the drum can is lower than the temperature at the time of plug tightening, the pressure is reduced by reducing the volume of air inside the drum can. When the plug is opened in this state, since the pressure inside the drum can is lower than the atmospheric pressure, a vacuum phenomenon occurs, and the air around the plug is sucked into the drum can. At this time, foreign matters such as dust and dust around the plug are also sucked together, which causes contamination (refers to a foreign matter entering the drum can or a product in which the foreign matter is mixed).

  In order to prevent the above phenomenon, for example, if the drum tightening operation is performed after the drum can is sufficiently cooled to room temperature, the internal pressure of the drum can is hardly reduced after the plug is tightened. However, in order to provide a dedicated drum can cooling process after the painting process, baking process, etc. in the production line, a cooling device is required in the case of forced cooling, and in the case of natural cooling, a large number of drum cans are required. Enormous space for temporary storage is required, and none of them is realistic.

  In order to prevent foreign matter from entering the inside of the drum can, a device in which the top plate is devised at the time of manufacture is disclosed in Patent Document 1, but at the time of plug tightening, Paying attention to the screw gap generated in the non-tightened state, using this screw gap, supply compressed air to the inside of the drum can and pressurize it so that foreign matter is sucked inside when the plug is opened. There seems to be no knowledge to prevent.

JP-A-10-277777

  An object of the present invention is to prevent peripheral foreign matter from being sucked into the drum can when the plug is opened by pressurizing the inside of the drum can in the plug tightening step.

  A first aspect of the invention for solving the above-described problems is that a pair of plugs disposed directly above the drum can in a state where the drum can is positioned in a set position on the transport line in both the transport direction and the circumferential direction. A drum can plug fastening method in which a screwdriver is lowered and a large and small plug provided on the top plate of the drum can be screwed and sealed by rotation of the pair of plug drivers. Then, each plug is screwed in while being pressurized by supplying compressed air to the inside of the drum.

  According to the first aspect of the present invention, in the temporarily tightened state of the large and small plugs, the tapered female threads on the inner peripheral surface of the inlet and the vent formed on the top plate of the drum can and the outer peripheral surface of the large and small plugs Focusing on the fact that a screw gap is formed between the taper male screw and the drum can be tightened after each plug is tightened by supplying compressed air from the screw gap. Is in a pressurized state. Therefore, after tightening the plug, the drum can is cooled, so even if the internal pressure is reduced, the pressure is reduced from the pressurized state. It becomes possible to make it equivalent to atmospheric pressure. As a result, when each of the large and small plugs is opened and the product is filled in the drum, it is possible to prevent peripheral foreign matter from being sucked at the time of opening and prevent contamination of the product.

  In addition, when tightening each large and small plug, a clearance between each tapered female screw on the inner peripheral surface of the inlet and the vent formed on the top plate of the drum can and a tapered male screw on the outer peripheral surface of the pair of large and small plugs. Therefore, since compressed air is supplied to the inside of the drum, it is not necessary to provide a process exclusively for internal pressurization.

  The invention of claim 2 is characterized in that, in the invention of claim 1, a chamber is installed in an airtight state above the top plate of the drum can, and compressed air is supplied into the drum can through the chamber.

  According to the second aspect of the present invention, the chamber is hermetically installed on the top of the top plate of the drum can, thereby facilitating the supply of compressed air to the inside of the drum can from the screw gaps of the large and small plugs.

  According to a third aspect of the present invention, in the second aspect of the present invention, the chamber is provided with a supply port and a discharge port for compressed air, and the original pressure of the compressed air supplied from the supply port is set inside the drum can. The pressure inside the drum can be increased while discharging a part of the compressed air in the chamber from the discharge port.

  According to the invention of claim 3, by discharging a part of the compressed air in the chamber from the discharge port, the original pressure of the compressed air can be made larger than the pressure required for pressurizing the drum can, Since the flow rate is increased, a required amount of compressed air can be supplied in a short time from the small screw gaps of the large and small plugs, and the inside of the drum can can be pressurized within the time required for plug tightening. Therefore, the tact time of the production line is not lengthened.

  In the invention of claim 4, a plurality of bottom surface support members for supporting the chime portion on the base plate side of the drum can which is transported to the plug tightening position by the chain transport device and stopped at the fixed position by the stopper is provided on the support plate. It is provided integrally at a predetermined interval along the circumferential direction, and the support plate is lifted by the lifting means, so that the support portion at the upper end of each bottom surface support member is between the individual chains constituting the chain transport device. A drum can support device that can support the drum can by a plurality of bottom surface support tools, and a drum can support for rotating and tightening the large and small plugs of the drum can supported by the drum can support device. A pair of plug drivers configured to be slidable in the axial direction by a predetermined length directly above the device, and each of the large and small drum cans supported by the drum can support device In order to make the arrangement position along the circumferential direction of the lug coincide with the position of the pair of plug drivers, and to support the upper end side of the drum can in an immovable state in all directions, a pair of clamps is provided on both sides of each plug. A drum clamping device comprising: a positioning clamp device for clamping the drum can, wherein the compressed air is supplied to the inside of the drum can through a gap between the large and small plugs of the drum can. A chamber with an open bottom surface is arranged directly above the top plate of the drum can supported by each bottom support, and a chime on the top plate side of the drum can is placed on the end surface portion of the bottom surface opening side of the chamber. A chamber apparatus configured to maintain the airtightness of the interior of the chamber by pressure contact, and supply the compressed air to the chamber, and the drum can When the compressed air is supplied to the inside of the drum can through the screw gap between the chamber and the plug, the drum can is supported by the pressurizing device for pressurizing and the bottom support of the drum can supporting device. A support plate locking device for locking the support plate of the drum can support device so that the support plate of the drum can support device does not fall down in order to resist the pressure applied to the top plate of the drum can, and the pair of plug drivers includes the chamber The positioning clamp device is arranged inside the chamber.

  According to the invention of claim 4, the drum can is temporarily stopped at a fixed position immediately before the pressure type plug fastening device by the chain conveying device, and the drum can rotates within one rotation at the stop position. When the position of the large plug is detected by the large plug detection sensor, the drum can is stopped and positioning along the circumferential direction of the drum can is performed. In this state, the drum can is transported to a position just below the pressure type plug fastening device by the chain transport device and stopped. In the drum can stopped at the plug fastening position of the pressure type plug fastening device, the support plate constituting the drum can support device is raised by a set amount. As a result, the drum can is slightly lifted by the support portion at the upper end of the plurality of bottom surface support members constituting the drum can support device projecting upward from between each single chain constituting the chain transport device, A portion of the chime on the bottom plate side is supported by the plurality of bottom surface support tools. After that, the support plate is supported and locked from below by a support plate locking device to resist the pressure acting on the top plate of the drum can when the inside of the drum can is pressurized. be able to.

  The positioning clamp device arranged inside the chamber constitutes a pair of clamps arranged on both sides of the pair of plugs, so that the pair of plugs are clamped from the outside. In addition, when the circumferential position of the pair of plugs of the drum can with respect to the pair of plug drivers is shifted, the drum can is slightly rotated so that the final positioning of the pair of plugs with respect to the pair of plug drivers is performed. In addition, the upper end side of the drum can is supported in an immobile state in all directions. In this state, the chamber of the chamber apparatus is lowered, and the lower end surface thereof is in pressure contact with the chime on the top plate side of the drum can, thereby maintaining the airtightness of the space formed by the chamber and the top plate of the drum can. .

  After that, while supplying compressed air into the chamber, a pair of plug drivers penetrating the top plate of the chamber is lowered and each of the large and small plugs is tightened. Compressed air is supplied to the inside of the drum can from the screw gap formed in the plug portion and pressurized. As a result, compressed air is supplied to the inside of the drum can before and during the tightening of the large and small plugs, so that an independent pressurizing step is not required. In addition, during pressurization, downward pressure acts on the top plate of the drum can, but the pressure is received by the support plate lock device that supports the support plate constituting the drum can support device from below. Therefore, the plug can be tightened stably.

  After that, the drum can supporting device is lowered so that the drum can supported by the plurality of bottom surface supports is transferred to a plurality of single chains constituting the chain conveying device, and is downstream by the chain conveying device. It is conveyed to.

  According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the positioning clamp device is configured such that the pair of clamps are on the side of the pair of large and small plugs of the drum can when the drum can is lifted by a set amount by the drum can support device. It is characterized in that the position in the height direction is fixed with respect to the frame so as to be disposed in the direction.

  According to the invention of claim 5, when the drum can supported by each chain unit of the chain conveying device is supported by each bottom support by the drum can support device, when the set amount is raised, A plug arrange | positions a pair of clamp tool which comprises a positioning clamp apparatus in the equivalent height. Therefore, it is possible to accurately and easily clamp the pair of large and small plugs of the drum can with the pair of clamps.

  According to the present invention, after tightening each plug, by performing the tightening operation of each plug while supplying compressed air from the screw gap formed in the temporarily tightened state of the pair of large and small plugs of the drum can The interior of the drum can is in a pressurized state by being sealed. Therefore, after tightening the plug, the drum can is cooled, so even if the internal pressure is reduced, the pressure is reduced from the pressurized state. It is possible to make it equal to the atmospheric pressure, and when opening the large and small plugs and filling the product inside the drum can, it can prevent surrounding foreign substances from being sucked at the time of opening, Product contamination can be prevented.

It is a top view of the pressurization type plug clamping device concerning the present invention. It is a side view similarly. It is a front view (X direction arrow view of FIG. 1) of the chamber apparatus C before pressurization. It is a front view of the chamber apparatus C for pressurization. It is a top view of drum can support device A in the state where support plate 1 rose. It is a side view (Y direction arrow view of FIG. 5) of the drum can support apparatus A of the same state. It is a side view of drum can support device A in the state where support plate 1 lowered. 2 is a perspective view of a chamber apparatus C. FIG. 4 is a bottom view of a chamber 25 that constitutes the chamber apparatus C. FIG. It is a front view of drum can D which fractured a part. 3 is an enlarged cross-sectional view of a portion of a large plug P ₁ of a drum can D. FIG.

First, with reference to FIGS. 1 to 3, the overall configuration of the pressurizing plug clamping device for the drum can D according to the present invention will be described, and thereafter, each individual component constituting the pressurizing plug clamping device will be described. The apparatus will be described in detail. The chain conveyance device E is composed of three endless single chains 71 spaced apart along the conveyance direction Q of the drum can D, and the drum can D is a tension side of the three endless single chains 71. It is carried on the upper travel part which is. As described above, since the plug tightening process of the drum can D is the final process of manufacturing the drum can D, the pressure type plug tightening apparatus according to the present invention is disposed at the end portion of the chain conveying device E, A large plug detection device (not shown) for detecting the position along the circumferential direction of the large plug P ₁ of the drum can D immediately before (immediately upstream) and correcting the position along the circumferential direction of the drum can D Is placed. 1 and 2, the arrangement position of the large plug detection device is indicated by a symbol J.

The pressure-type plug fastening device is configured such that the drum can D transported by the chain transport device E and stopped at a set position for fastening the plug is attached to the support plate 1 by a plurality of bottom surface support members 3. A drum can support device A for lifting and supporting from each chain unit 71 constituting the chain conveying device E, and a pair of large and small plugs P ₁ and P ₂ of the drum can D supported by the plurality of bottom surface support members 3 is disposed, and a pair of plug driver G _1, G ₂ to perform tightening of the respective plug P _1, P _2, is disposed directly above the drum D, the top plate 82 of the chamber 25 and the drum D The chamber apparatus C for forming a sealed space and the chamber apparatus C to clamp the plugs P ₁ and P ₂ when the plugs P ₁ and P ₂ of the drum can D are tightened. When the positioning clamp device B disposed inside C and the plugs P ₁ and P ₂ are tightened, compressed air is supplied into the chamber 25 constituting the chamber device C, and the inside of the drum can D And a support plate locking device R for locking the support plate 1 of the drum can support device A supporting the drum can D in a state of being supported from below.

As shown in FIGS. 10 and 11, the drum can D is provided on the diameter line of the top plate 82, with the upper end portion and the lower end portion of the cylindrical body plate 81 being closed by the top plate 82 and the base plate 83, respectively. A pair of large and small plugs P ₁ and P ₂ are provided to close the inlet 84 and the ventilation port 85, and the upper and lower ends of the trunk plate 81, the upper and lower ends of the trunk plate 81, the top plate 82, and the ground plate are provided. This is a structure in which chimes (edge portions) 86 and 87 are formed by winding the peripheral portions of 83 together. The body plate 81 is reinforced by two annular zones 88. Further, as shown in FIG. 11, a flange 91 having a short cylindrical shape inside the standing short cylindrical portion 89 forming the inlet 84 and the ventilation port 85 and having an internal thread formed on the inner peripheral surface thereof. Is inserted, and the inlet 84 and the ventilation port 85 are hermetically sealed by screwing the female screw on the inner peripheral surface of the flange 91 and the male screw on the outer peripheral surface of each of the plugs P ₁ and P ₂ . Since the female thread of the flange 91 and the male threads of the plugs P ₁ and P ₂ are both pipe threads, a screw gap 92 is formed between the threads in the temporarily tightened state of the plugs P ₁ and P _2. In the present invention, the compressed pressure is applied by supplying compressed air into the drum D using the screw gap 92.

As shown in FIGS. 5 to 7, the drum can support device A is disposed immediately below the chamber device C and below the chain transport device E, and the support plate 1 is disposed in the transport direction Q of the drum can D. Supported and guided by a total of four guide rods 2 arranged on both side portions along the two sides, and supported between the two guide rods 2 on both sides of the support plate 1 arranged along the conveying direction Q of the drum D. A plate lifting cylinder S ₁ is arranged, and the support plate 1 is guided by a total of four guide rods 2 and is lifted and lowered by each support plate lifting cylinder S ₁ . The raising / lowering amount, rising end, and falling end of the support plate _{1 are} determined by a pair of support plate raising / lowering cylinders S1. On the upper surface of the support plate 1, a plurality (eight in the embodiment) of the bottom support 3 that supports the drum can D with the lower chime 87 (see FIG. 10) is provided at predetermined intervals along the circumferential direction. Arranged. The bottom surface support 3 has a configuration in which a hooked support roller 3b is rotatably supported on the upper end portion of the roller support plate 3a with the flange portion on the outside. In FIGS. 5 and 6, 14 indicates a rod of the support plate elevating cylinder S _1.

As shown in FIG. 5, the single chain 71 has a predetermined width, and is guided by chain guides (not shown) arranged on both sides in the width direction to enable linear travel. Among the single chains 71 of the book, outside of the single chains 71 on both sides, and between the bottom support members 3 adjacent to each other along the circumferential direction, each chain guide is provided with a bracket (not shown). two stopper pins 4 are out possible arranged by a stopper pin elevating cylinder S ₂ against monomer chain 71. That is, the rod of the stopper pin lifting cylinder S ₂ is the stopper pin 4. In order to stop the drum D just above the support plate 1, the two stopper pins 4 are arranged directly above the support plate 1 and in the half of the downstream side along the conveyance direction Q of the drum D. The Thus, in a state of protruding above the stopper pin elevating cylinder S ₂ by itself chains 71 of the two stopper pins 4, when the drum D by a chain conveyor device E is transported to the portion directly above the support plate 1 When the drum can D is divided into two along the conveying direction Q, the lower end of the downstream portion abuts against the two stopper pins 4, so that the drum can D is set with the two stopper pins 4. It stops at the fixed position.

By lifting the support plate ₁ by the support plate lifting cylinder S _{1, the} drum can D placed on the total of three single chains 71 is made up of the plurality of bottom surface support members 3 provided integrally with the support plate 1. The bottom surface (the lowest lower chime 87) of the drum can D is lifted slightly above the three single chains 71 by being transferred and supported by the attached support roller 3b. In the present invention, when the drum can D is lifted above the three single chains 71 as described above, when the large and small plugs P ₁ and P ₂ are tightened, the respective plugs P ₁ and P ₂ are tightened. The inside of the drum can D is pressurized by supplying the compressed air to the inside of the drum can D by using the screw gap 92 formed in the above portion. Therefore, since a large downward force is applied to the top plate 82 portion of the drum can D when the drum can D is internally pressurized, the support plate 1 needs to be prevented from falling against the force. .

For this reason, as shown in FIGS. 5 to 7, the drum can support device A includes a support plate locking device R. The support plate locking device R is disposed horizontally on the support plate 1 on the upstream side and the downstream side in the transport direction Q of the drum D on the support plate 1 along the direction T perpendicular to the transport direction Q. Then, both end portions of the rotation shaft 5 are rotatably supported by a pair of support bases 6. Lock levers 7 are integrally attached to portions of the rotating shafts 5 near the corner portions of the rectangular support plate 1. That is, the lock lever 7 is integrally attached to the inner part of the pair of support bases 6 on one rotating shaft 5. A lock lever rotating cylinder S ₃ is attached to each horizontal member 8 constituting the frame F and disposed on both sides along the conveyance direction Q of the drum can D of the drum can support device A in a substantially vertical posture. The rod 9 of the lock lever rotation cylinder S ₃ and the rotation lever 11 integrally attached to one end of the rotation shaft 5 are connected. The attachment position of the rotation lever 11 with respect to the rotation shaft 5 is shifted by approximately 90 ° with respect to the attachment position of the lock lever 7. A lock claw 7a is integrally provided inward at a lower end portion of the lock lever 7 that is arranged substantially vertically when the support plate 1 is locked, and is close to each corner portion of the support plate 1 by the lock claw 7a. By supporting the lower surface of the locked plate portion 1a projecting in the conveyance direction Q of the drum can D at the portion, the support plate 1 is locked so as not to descend when the drum can D is pressurized.

Next, with reference to FIGS. 1 to 3, 8, and 9, a pair of large and small plug drivers G ₁ and G ₂ , a chamber device C, and a positioning clamp device B disposed immediately above the drum can support device A, It will be explained collectively. As shown in FIGS. 3 and 7, guide rods 23 are vertically disposed on the pair of upper and lower horizontal members 21 and 22 along the conveyance direction Q of the drum D at the left and right ends of the frame F when viewed from the front. Both end portions of the chamber mounting member 24 are supported by a pair of left and right guide rods 23 so as to be movable up and down, and a circular chamber 25 having an open bottom surface is integrally attached to the lower surface (back surface) of the chamber mounting member 24. ing. The chamber mounting member 24 and the horizontal member 26 that constitutes the frame F and is disposed at the top along the direction T perpendicular to the conveyance direction Q of the drum D are a pair of left and right chamber lifting cylinders S ₄ . by being connected, the chamber 25 is raised and lowered by a pair of right and left chamber elevating cylinders S _4. A ring-shaped sealing material 27 is integrally attached to the lower end surface of the chamber 25, and the sealing material 27 on the lower end surface of the chamber 25 at the lower end of the chamber 25 has three single chains 71. The inside of the chamber 25 is hermetically sealed by being brought into pressure contact with the chime 86 on the upper side of the drum can D supported by the plurality of bottom surface supports 3.

In addition, as shown in FIGS. 2, 3, 7 and 8, in the large plug detection device disposed immediately upstream of the pressure type plug fastening device, the drum can D is rotated (rotated within one rotation). And detecting the large plug P ₁ with the detection sensor, so that the line connecting the centers of the pair of large and small plugs P ₁ and P ₂ is along the conveyance direction Q of the drum can D. The circumferential arrangement position of D is corrected, and in this state, the drum can D is transported to the drum can support device A. The positioning clamp device B disposed inside the chamber 25 has a configuration in which the pair of clamp tools 31 approach and separate from each other along the direction T, and the pair of clamp tools 31 are close to each other. The pair of plugs P ₁ and P ₂ are clamped from the outside to stabilize the tightening operation. A clamp tool mounting plate 33 is integrally mounted along the direction T on the back surface of the clamp tool mounting plate 33 disposed inside the chamber 25, and a pair of clamp tools 31 is provided with a clamp tool cylinder provided respectively. by S _5, is mounted becomes closer to or separable along said direction T to the clamp fixture mounting plate 33. A pair of clamping pieces 34 and 35 capable of clamping a pair of large and small plugs P ₁ and P ₂ from the outside are integrally attached to both ends in the longitudinal direction of the pair of clamps 31 so as to face the inside. Yes. The chamber support rod 36 passes through the chamber mounting member 24 and the top plate 25 a of the chamber 25, and the clamp tool mounting plate 33 is integrally attached to the lower end portion of the chamber support rod 36. upper end is disposed between the pair of chambers elevating cylinder S _4, is attached integrally to the lower end of the mounting member 37 provided vertically from said horizontal member.

Therefore, as shown in FIG. 3, the positioning clamp device B is arranged with the position in the height direction unchanged with respect to the frame F, and the drum can D is constituted by the plurality of bottom surface support members 3 constituting the drum can support device A. In the tightened state of the plugs that are lifted and supported from the three single chains 71 in total, the two pairs of sandwiching pieces 34, 35 attached to the pair of clamps 31 are arranged in the height direction. The position and the arrangement position in the height direction of the pair of large and small plugs P ₁ and P ₂ of the drum can D in the plug tightened state are substantially the same. For this reason, the arrangement position in the height direction of the two pairs of sandwiching pieces 34, 35, which are one-on-one, is slightly lower than the arrangement position of the sealing material 27 on the lower end surface of the chamber 25. In FIG. 3, 38 is integrally attached to the top plate 25 a of the chamber 25, and is fixedly disposed with the chamber 25 that can be moved up and down by being slidably fitted to the chamber support rod 36. This is a shaft support member for stabilizing the arrangement position excluding the height direction of the chamber 25 by making the arrangement relationship with the chamber support rod 36 excluding the height direction unchanged.

Further, as shown in FIG. 2, plug drivers for tightening the respective plugs P ₁ and P ₂ directly above the pair of large and small plugs P ₁ and P ₂ of the drum can D arranged at the plug tightening position. G ₁ and G ₂ are arranged in the vertical direction, and their upper end portions are supported by driver support portions 41 and 42 provided at the upper end portion of the frame F. A pair of guide rods 43 are vertically arranged at a predetermined interval along the conveyance direction Q of the drum can D at a portion extending from the position where the chamber 25 is disposed at the center in the direction T which is the width direction of the frame F. The driver lifting cylinders S ₆ and S ₇ for lifting and lowering the pair of large and small plug drivers G ₁ and G ₂ are disposed vertically inside the upper end of each guide rod 43, respectively. The brackets 44 fitted into the guide rods 43 support the lower ends of the plug drivers G ₁ and G ₂ , and the brackets 44 are moved up and down by the driver lifting cylinders S ₆ and S ₇ . That is, each of the plug drivers G ₁ and G ₂ has a structure in which a part of the plug drivers G ₁ and G ₂ slide to change the overall length in order to tighten the plugs P ₁ and P ₂ .

The lower ends of the plug drivers G ₁ and G ₂ penetrate through the top plate 25a of the chamber 25 in an airtight state and enter the chamber 25, and the plug drivers G ₁ and G ₂ The tightening portion at the lower end portion is disposed between two pairs of sandwiching pieces 34 and 35 that are integrally attached to the pair of clamp tools 31 of the positioning clamp device B. Regarding the vertical arrangement, The tightening portion at the lower end of each plug driver G ₁ , G ₂ is disposed below the seal material 27 at the lower end surface of the chamber 25.

As shown in FIGS. 3 and 4, the top plate 25 a of the chamber 25 is provided with a compressed air supply port 51 and a discharge port 52. Compressed air is supplied through line 53. The compressed air source K, the pipe line 53, and the on-off valve 54 incorporated in the middle of the pipe line 53 constitute a pressurizing device M that pressurizes the inside of the drum can D. The discharge port 52 is provided by supplying compressed air having a pressure Pb larger than the pressure Pa at which the inside of the drum D is finally pressurized and releasing a part of the compressed air in the chamber 25. When the pressure Pb is reduced to the pressure Pa, the time required for supplying the required amount of compressed air into the drum can D becomes faster than the supply of compressed air at the target pressure Pa from the beginning. It is because it can shorten. The size and number of the compressed air supply port 51 and the discharge port 52 are the flow rate of the compressed air supplied into the drum D from the screw gap 92 of the pair of large and small plugs P ₁ and P ₂ , in other words, It is determined in relation to the time required until the internal pressure of the drum D is set to the required pressure (set pressure).

  Here, from the results of experiments conducted by the present inventors, when the temperature drops by 10 ° C., the internal pressure of the drum can D is reduced by about 30 hPa. Therefore, if the temperature of the drum can D at the time of tightening the plug is 60 ° C. and the temperature at the time of use of the drum can D is 30 ° C., it is necessary to pressurize only about 90 hPa. It is necessary to set (1,013 + 90) hPa≈1,100 hPa.

  Further, regarding the supply pressure of compressed air, in order to increase the internal pressure of the drum can D to the set pressure, for example, without providing a discharge port (relief portion), rather than supplying 600 hPa of compressed air, the discharge port (relief portion) ) And supplying compressed air of 1,000 hPa shortens the time until the internal pressure of the drum D reaches the set pressure. Note that, if the inside of the chamber 25 is suddenly pressurized at 1,000 hPa or more, the top plate 82 of the drum can D may be deformed. When the pressure is 1,000 hPa, it is necessary to provide a discharge port (a relief part) 52 in the chamber 25.

  Next, with reference to FIGS. 1-7, the effect | action of the pressurization type plug clamping apparatus of the said structure is demonstrated. As shown in FIGS. 1 and 2, the drum can D is temporarily stopped by the chain conveying device E at the portion of the large plug detecting device immediately before the pressure type plug fastening device, and the drum can D is 1 at the stop position. By performing the rotation within the rotation, when the position of the large plug is detected by the large plug detection sensor, the drum can is stopped and positioning along the circumferential direction of the drum can is performed.

In this state, the drum D is the chain driving device E, is conveyed to just below the pressurized plug clamping device, the stopper pin elevating cylinder S of the pair that protrudes above the single chain 71 by ₂ stopper pin 4 The drum can D stops at the plug tightening position. The drum can D stopped at the plug tightening position constitutes the drum can support device A by the support plate 1 constituting the drum can support device A being raised by a set amount by the pair of support plate lifting cylinders S _1. The drum support D is lifted slightly by the flanged support rollers 3b at the upper end portions of the plurality of bottom surface support tools 3 projecting upward from between the individual chains 71 constituting the chain conveying device E. A chime 87 on the bottom plate side is supported by the plurality of bottom surface support tools 3. Thereafter, the rotation shaft 5 is rotated by the lock lever rotation cylinders S ₃ constituting the support plate locking device R. As a result, the lower surface of the support plate 1 is supported by the lock claws 7a of the plurality of lock levers 7, so that the support plate 1 is locked so as not to move downward. Thereby, the pressure which acts on the top plate 82 of the said drum can D can be resisted at the time of the internal pressurization of the drum can D.

In the state where the drum can D is lifted, as shown in FIG. 3, a pair of large and small plugs P ₁ , P ₂ of the drum can D and two sets of sandwiching pieces constituting a pair of positioning clamp device B The positions in the height direction with respect to 34 and 35 are the same, and the respective pair of holding pieces 34 and 35 are separated from each other on the side of the pair of large and small plugs P ₁ and P _2. Arranged in a non-clamping state. Thereafter, the pair of clamps 31 constituting the positioning clamp device B are brought close to each other by the clamp tool cylinder S ₅ , so that the pair of plugs P ₁ and P ₂ are sandwiched by each pair. By being clamped by the pieces 34 and 35, the upper end side of the drum can D is supported in an immobile state in all directions. At that time, when the circumferential positions of the pair of plugs P ₁ and P ₂ with respect to the pair of plug drivers G ₁ and G ₂ are shifted, the drum can D is slightly rotated in a predetermined direction, The final positioning of the pair of plugs P ₁ and P ₂ with respect to the pair of plug drivers G ₁ and G ₂ is performed. As shown in FIG. 4, in the above state, the chamber of the chamber apparatus C is lowered by the pair of chamber elevating cylinders S ₄ , and the sealing material 27 at the lower end surface thereof becomes the chime 86 on the top plate side of the drum can D. By pressure-contacting, the airtightness of the space formed by the chamber 25 and the top plate 82 of the drum can D is maintained.

When the sealing material 27 on the lower end surface of the chamber 25 is in pressure contact with the chime 86 on the upper side of the drum can D, the on-off valve 54 incorporated in the pipe 53 of the pressurizing device M is opened, and the top plate 25a of the chamber 25 is opened. Compressed air is supplied into the chamber 25 from the compressed air source K through the formed supply port 51, and a part of the compressed air supplied into the chamber 25 from the discharge port 52 is discharged to the outside. When the large and small plugs P ₁ and P ₂ are tightened by lowering the pair of plug drivers G ₁ and G ₂ penetrating through the top plate 25a of the chamber 25, each of the large and small plugs is tightened before or during the tightening. Compressed air is supplied into the drum D from the screw gap 92 formed in the plugs P ₁ and P ₂ and pressurized. The degree of pressurization is as described in the paragraphs “0036” and “0037”, and the time required for tightening the plugs P ₁ and P ₂ is about 4 seconds. Seconds.

Thus, since compressed air is supplied into the drum can before and during the tightening of the pair of large and small plugs P ₁ and P ₂ , there is an advantage that an independent pressurizing step is not required. Further, at the time of pressurization, a downward pressure acts on the top plate 82 of the drum can D. The pressure is a support plate locking device that locks the support plate 1 constituting the drum can support device A from below. Since it is received by R, the plug can be tightened stably.

  After that, after separating the pair of clamps 31 constituting the positioning clamp device B, the chamber 25 is slightly raised, and in this state, the support plate 1 of the drum can support device A is lowered, whereby a plurality of bottom surfaces are obtained. The drum D supported at the bottom by the support 3 is transferred to a total of three single chains 71 constituting the chain conveying device E, and is conveyed downstream by the chain conveying device E.

The pressure in the drum can D is lowered by reducing the temperature of the drum can D to which the pair of large and small plugs P ₁ and P ₂ are tightened while pressurizing the inside of the drum can D. The internal pressure is applied in anticipation of the decrease in. Therefore, when the plugs P ₁ and P ₂ are opened, the inside of the drum can D becomes equivalent to the atmospheric pressure, and the peripheral foreign matter is sucked into the drum can D from the inlet 84 and the vent 85. This eliminates product contamination and prevents product contamination.

A: Drum can support device
B: Positioning clamp device
C: Chamber device
D: drums G _1, G _2: plug driver
K: Compressed air source
M: Pressurizing device
P ₁ : Large plug
P ₂ : Small plug
Q: Drum can transport direction
T: Direction perpendicular to the drum transport direction
1: Support plate
3: Bottom support
25: Chamber
31: Clamping tool
51: Supply port of compressed air
52: Compressed air outlet
53: Pipe line
54: Open / close valve
82: Top of drum can
86: Upper chime of drum
87: Chime below the drum
92: Screw gap

Claims (5)

In a state where the drum can is positioned in both the transport direction and the circumferential direction at a set position on the transport line, the pair of plug drivers disposed immediately above the drum can is lowered, and by rotation of the pair of plug drivers, A drum can plug fastening method for screwing and sealing each of the large and small plugs provided on the top plate of the drum can,
A method of tightening a plug of a drum can, wherein the plug is screwed in while being pressurized by supplying compressed air to the inside of the drum can from a screw gap of the plug.   The method of claim 1, wherein a chamber is hermetically installed above the top plate of the drum can, and compressed air is supplied into the drum can through the chamber.   The chamber has a supply port and a discharge port for compressed air, and the original pressure of the compressed air supplied from the supply port is set higher than the pressure of the compressed air supplied to the inside of the drum can. 3. The method of claim 2, wherein the inside of the drum can is pressurized while discharging a part of the compressed air in the chamber from the discharge port. A plurality of bottom surface support tools for supporting the chime portion on the base plate side of the drum can which has been transported to the plug tightening position by the chain transport device and stopped at the fixed position by the stopper, is provided at predetermined intervals along the circumferential direction on the support plate. The support plate at the upper end of each bottom surface support tool protrudes from between the individual chains constituting the chain conveying device by raising the support plate by lifting means. A drum can support device capable of supporting the drum can with a plurality of the bottom support;
A pair of plug drivers configured to be axially slidable by a predetermined length directly above the drum can support device in order to rotate and tighten the large and small plugs of the drum can supported by the drum can support device;
The arrangement position along the circumferential direction of each of the large and small plugs of the drum can supported by the drum can support device is matched with the position of the pair of plug drivers, and the upper end side of the drum can is supported in an immovable state in all directions. Therefore, a positioning clamp device for clamping both sides of each plug by a pair of clamps,
Drum can plug fastening device comprising:
In order to supply compressed air to the inside of the drum can through a gap between the large and small plugs of the drum can, a chamber having a lower surface opened immediately above the top plate of the drum can supported by each bottom surface support of the drum can support device. A chamber device that is arranged so as to be capable of ascending and descending, and is configured to maintain airtightness inside the chamber by pressing the chime on the top plate side of the drum can against the end surface portion on the lower surface opening side of the chamber,
A pressure device for supplying compressed air to the chamber to pressurize the interior of the drum can;
When the drum can is supported by each bottom support of the drum can support device and compressed air is supplied to the inside of the drum can through the screw gap between the chamber and each plug, it resists the pressure applied to the top plate of the drum can. In order to do so, a support plate locking device for locking the support plate of the drum can support device so as not to lower downward,
The pair of plug drivers pass through the top plate of the chamber and face the inside, and the positioning clamp device is disposed inside the chamber. .   The positioning clamp device has a height with respect to the frame so that the pair of clamps are arranged on the side of the pair of large and small plugs of the drum can when the drum can is lifted by a set amount by the drum can support device. 5. The pressure plug fastening device for a drum can according to claim 4, wherein the direction position is fixed.

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