JPH07232798A - Opening and closing device for threaded lid of drum can - Google Patents

Abstract

PURPOSE:To attach a threaded lid to and detach the lid from a mouth part of a drum can in an automatic manner. CONSTITUTION:A threaded lid opening and closing device is provided with a driving shaft 11 with an engaging blade 12 driven by a motor M, a freely telescopically movable supporting cylinder 20 and a guide part 30. When a threaded lid D3 is retained by the guide part 30 and is engaged with a mouth part D1 from above, since the threaded lid is positioned appropriately in its entirety to permit the engaging blade 12 to engage with the locking projections D3c of the threaded lid D3, the threaded lid D3 can be rotated by the motor M.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening / closing unit for a screw lid of a drum can for automatically attaching and removing the screw lid to the mouth of the drum can.

[0002]

2. Description of the Related Art An iron drum is equipped with a screw lid at its mouth.

The screw lid of the drum can has a male screw on the outer peripheral surface and is formed in a shallow dish shape by denting the upper surface, and has a small outer flange abutting the upper end surface of the mouth portion at the upper end portion. Has been formed. An O-ring for sealing is attached to a lower portion of the outer flange, and a pair of engaging protrusions facing each other is formed inside. However, the engagement protrusion is formed from the top surface of the bottom of the screw lid to a position slightly lower than the top surface of the outer flange, and its cross-sectional shape is an isosceles trapezoid.

When opening and closing such a screw lid, a scissor-shaped tool having a pair of outward engaging claws at its tip is used to engage the engaging claws from one side of each engaging projection. The whole may be rotated clockwise or counterclockwise.

[0005]

According to the prior art, since the screw lid must be opened and closed manually, the work efficiency is poor and it is difficult to properly control the tightening torque. was there. Further, since the scissors-like tool lacks means for automatically positioning it with respect to the mouth portion, it may be suitable for manual use, but it is not always suitable when incorporated into an automatic machine. It was

In view of the above problems of the prior art, the object of the present invention is to suitably incorporate it into an automatic machine by combining a drive shaft having engaging blades, a support cylinder, and a guide portion. (EN) Provided is an opening / closing unit for a screw cap of a drum can, which can realize proper management of tightening torque easily.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the structure of the present invention comprises a drive shaft having an upper end connected to a drive source and an engaging blade at the lower end which engages with a screw lid of a drum can, and a drive shaft. It comprises a support cylinder that coaxially accommodates the shaft, and a guide portion that is connected to the lower end of the support cylinder and that fits into the mouth of the drum can from above. The main point is that the elastic member expands and contracts to appear and disappear below the guide portion.

The guide portion can be swingably connected to the support cylinder and can be detachably connected to the support cylinder.

Further, the guide portion may be configured to be capable of detachably holding the screw lid, or may be provided with an air nipple connected to an air source.

[0010]

According to the structure of the invention, the engaging blades are
Since it is mounted on the drive shaft connected to the drive source, the screw lid of the drum can is engaged with the engaging blades to start the drive source, and the screw lid is rotated clockwise or counterclockwise to open the mouth of the drum can. The part can be fitted with a screw lid or it can be removed from the mouth. At this time, the support cylinder is
The whole part including the drive source is supported, and the guide part is fitted into the mouth part of the drum can from above to properly position the whole part including the engaging blades above the mouth part.

When the guide portion is swingably connected to the support barrel, the support barrel can be tilted relative to the guide portion, so that the entire body including the support barrel is attached to the mouth of the drum can. Even if it is slightly tilted, there is no possibility that the whole operation will be hindered.

If the guide portion is detachable from the support cylinder, the entire engaging blade can be exposed by removing the guide portion, which is convenient when replacing the engaging blade.

When the guide portion can detachably hold the screw lid, when the screw lid is attached to the mouth portion, it can be attached to the guide portion in advance and brought close to the mouth portion,
Further, when removing the screw lid from the mouth portion, the guide portion does not allow the removed screw lid to remain in the mouth portion and can be retracted to an appropriate position while holding the screw lid.

If an air nipple is attached to the guide portion, the air nipple can introduce air into the inside of the guide portion when the screw lid is attached to the mouth portion of the drum can and enclose the air in the drum can. Even when the drum can is filled with a substance at a temperature higher than normal temperature and the screw lid is immediately attached,
There is no possibility that the inside of the drum can becomes extremely negative pressure, which makes it difficult to remove the screw lid or deforms the drum can.

[0015]

Embodiments Embodiments will be described below with reference to the drawings.

The opening / closing unit of the screw lid of the drum can includes a drive shaft 11 having an engaging blade 12 at a lower end, a support cylinder 20 coaxially accommodating the drive shaft 11, and a guide portion 30 connected to a lower end of the support cylinder 20. (Figs. 1 and 2). The upper end of the drive shaft 11 is connected to the shaft M1 of the motor M, and the upper end of the support cylinder 20 is connected to the flange M2 of the motor M via the flange 21a and the bolts 20a, 20a.

The mouth portion D1 of the drum can D is fitted with a mouthpiece D2 having an internal thread D2a on its inner circumference. The screw lid D3 of the drum can D has a male screw D3a on the outer circumference, and an O-ring D4 is attached to the lower portion of the outer flange D3b at the upper end. The male screw D3a is adapted to the female screw D2a of the mouth portion D1, and the outer flange D3b corresponds to the upper end surface of the mouthpiece D2 via the O-ring D4. Inside the screw lid D3, a pair of engaging projections D3c, D3c facing each other are projected.

At the tip of the shaft M1 of the motor M, a plane M1
A, M1a ... Are formed on four faces, and a deformed shaft hole 11a adapted to the shaft M1 is formed at the upper end of the drive shaft 11. Therefore, the drive shaft 11 is non-rotatably connected to the shaft 11 via the set screw 11b by inserting the shaft M1 into the deformed shaft hole 11a.

The lower end of the drive shaft 11 has a screw hole 1 in the axial direction.
1c is formed, and the engagement blade 12 is fixed at a right angle to the lower end of the drive shaft 11 via a bolt 12a screwed into the screw hole 11c. However, at the lower end of the drive shaft 11, by forming a groove 11d1 corresponding to the thickness of the engaging blade 12 in the radial direction, a pair of sandwiching portions 11d, 11d for sandwiching the engaging blade 12 from both sides are formed. (FIGS. 2 and 3).

The engagement blade 12 is a thick plate material projecting on both sides of the drive shaft 11, its entire length is slightly shorter than the inner diameter of the screw lid D3, and its vertical width is the width of the screw lid D3. The heights of the abutting portions D3c and D3c are almost the same. Also,
A stepped bolt hole 12b is vertically formed in the center of the engaging blade 12 for inserting the bolt 12a. Both ends of the engaging blade 12 can be engaged with the engaging protrusions D3c and D3c by sinking the entire engaging blade 12 inside the screw lid D3 (FIG. 3).

The support cylinder 20 is slidable with respect to an inner cylinder 21 having a stepped flange 21a at its upper end, an outer cylinder 22 attached to a middle portion of the lower surface of the flange 21a, and a lower outer circumference of the inner cylinder 21. The intermediate cylinder 23 to be fitted and the mounting cylinder 24 slidably fitted to the outer periphery of the upper portion of the intermediate cylinder 23 are the main members (FIGS. 2 and 3).

The inner diameter of the inner cylinder 21 is slightly larger than the maximum diameter of the drive shaft 11, and a circular recess 21b is formed on the upper end surface. In addition, the recess 21b is a flange M of the motor M.
Fits the circular projection M2a for positioning formed on the lower surface of 2. The lower surface of the flange 21a is stepped so as to fix the outer cylinder 22 downward and form a long thin portion into which the intermediate cylinder 23 is fitted. A retaining ring 21c is attached to the lower end of the inner cylinder 21.

The outer cylinder 22 is a thin cylindrical body having an inner flange 22a at the upper end. The outer cylinder 22 is the inner flange 2
2a is attached downwardly to the middle portion of the lower surface of the flange 21a via screws 22b, 22b ...

The intermediate cylinder 23 has a deep upward annular groove 23.
a, an incomplete double cylinder having a shallow downward annular groove 23b, and the lower portion of the compression spring 23c is housed in the annular groove 23a. The upper end of the compression spring 23c is in contact with the lower surface of the inner flange 22a of the outer cylinder 22, and therefore,
The intermediate cylinder 23 is biased downward via a compression spring 23c. However, the lower limit of movement of the intermediate cylinder 23 is restricted by the retaining ring 21c.

A retaining ring 23 is provided at the upper end of the outer periphery of the intermediate cylinder 23.
The ring 23e is slidably fitted to the lower portion of the retaining ring 23d. In addition, the intermediate cylinder 23
Has a slightly larger diameter, and the lower end has a pair of holding holes 23f, 23f extending from the outer surface to the annular groove 23b.
Is formed in the radial direction, and balls 23g and 23g are housed in the holding holes 23f and 23f. In addition, each ball 2
3 g of the holding hole 2 so that it does not protrude to the outer periphery of the intermediate cylinder 23.
When pushed into 3f, it is assumed that a part thereof projects toward the annular groove 23b.

The mounting cylinder 24 has an annular engaging projection 24a in the middle portion of the inner periphery and a step portion 24b in the upper portion of the inner periphery. In addition, the mounting cylinder 24 is connected to the intermediate cylinder 23 via the engagement protrusion 24a.
Is slidably fitted to the upper part of the above, and the upper part is slidably inserted into the outer cylinder 22. Engaging projection 24
Between a and the ring 23e fitted to the intermediate cylinder 23,
The compression spring 24c is interposed, and therefore the mounting cylinder 24 is biased downwardly with respect to the intermediate cylinder 23 via the compression spring 24c. The lower portion of the mounting cylinder 24 covers the lower portion of the intermediate cylinder 23 to prevent the balls 23g, 23g from falling out of the holding holes 23f, 23f.

The guide portion 30 has two step portions 30 on the inner surface of the lower portion.
It is a skirt body having a and 30b. Lower step 30
a is adapted to the upper portion of the mouthpiece D2 of the drum can D, and the upper step portion 30b is an outer flange D3b of the screw lid D3.
Shall conform to. Further, the upper portion of the guide portion 30 is inserted into the downward annular groove 23b of the intermediate cylinder 23, and the balls 23g, 2
Engagement recesses 30c, 30c are formed so as to correspond to 3g.

Therefore, the guide portion 30 has the balls 23g, 2
By projecting a part of 3g into the engaging recesses 30c, 30c, it is swingable around the diameter connecting the balls 23g, 23g. Further, the mounting cylinder 24 is pushed upward against the compression spring 24c, and the balls 23g, 23g are taken out from the holding holes 23f, 23f.
Can be removed from the intermediate cylinder 23. That is,
The guide portion 30 is swingably and detachably connected to the intermediate cylinder 23.

At the lower part of the guide portion 30, step portions 30a, 30
A plurality of setscrews 31, 31, ... Are radially mounted in the middle of b (FIGS. 2 and 4). However, the set screw 31,
It is assumed that three or more of 31 ... Are arranged at equal intervals in the circumferential direction of the guide portion 30, but only one of them is shown in FIGS. 2 and 4.

A compression spring (not shown) is incorporated in the set screw 31, and a ball 31a is attached to the tip thereof. However, the ball 31a can be retracted from the tip of the set screw 31 by a compression spring. Further, a set nut 31b is screwed onto the set screw 31, and the set screw 31 can be fixed by arbitrarily adjusting the height of the ball 31a protruding into the guide portion 30. The mounting position of each set screw 31 is such that when the outer flange D3b of the screw lid D3 is brought into contact with the step portion 30b, the ball 31a is attached.
Should be positioned immediately below the outer flange D3b.

Therefore, if the screw lid D3 is pushed in until the outer flange D3b contacts the stepped portion 30b, the guide portion 30 can hold the screw lid D3 as it is via the set screws 31, 31, .... At this time, the intermediate cylinder 23 is lowered by the compression spring 23c until the lower end abuts on the retaining ring 21c, and the engaging blade 12 is entirely guided by the guide portion 3.
It is assumed that it is housed in 0 and is located immediately above the screw lid D3.

On the other hand, the support cylinder 20 can be shortened in its entire length by pushing the intermediate cylinder 23 upward against the compression spring 23c (FIG. 3). That is,
The support cylinder 20 is expandable and contractable via an intermediate cylinder 23. Further, when the support cylinder 20 is shortened in this way,
The engagement blade 12 partially protrudes below the guide portion 30,
It can be relatively sunk inside the screw lid D3 held by the guide portion 30 (two-dot chain line in FIG. 2). That is, the engaging blades 12 can be retracted below the guide portion 30 by expanding and contracting the support cylinder 20. Further, at this time, both ends of the engaging blade 12 engage with the engaging protrusions D3c and D3c of the screw lid D3 from one side (FIG. 5), and if the motor M is started in this state, it is driven. Axis 11,
The screw lid D3 can be rotated in the forward and reverse directions via the engaging blades 12.

Now, at the mouth D1 of the drum can D, the screw lid D3
When installing the, first, attach the screw lid D to the bottom of the guide portion 30.
Hold 3 correctly (solid line in Figure 2). After that, if the whole is moved above the mouth portion D1 and the guide portion 30 is pushed downward so as to cover the mouth portion D1 (two-dot chain line in the figure),
The step portion 30a of the guide portion 30 abuts on the upper end surface of the mouthpiece D2 of the mouth portion D1 to position the whole body including the screw lid D3 on the mouth portion D1, and by shortening the support cylinder 20, The compound blade 12 sinks into the screw lid D3 so that both ends of the engagement blade 12 can be engaged with the engagement protrusions D3c and D3c. Then, the motor M is started and the screw lid D3
When is rotated clockwise, the male screw D3a of the screw lid D3 is screwed into the female screw D2a of the mouthpiece D2, and the screw lid D3a can be attached to the mouth portion D1 (FIG. 3). The screw cap D3 is
While being screwed into the mouth portion D1, it advances downward, but at this time, the support cylinder 20 shortens as the screw lid D3 advances, so that the engaging blade 12 is engaged with the engaging protrusions D3c, D3c.
There is no risk of disengagement with.

When the screw lid D3 is tightened with an appropriate tightening torque, the motor M is stopped and the whole of the mouth portion D1 is stopped.
Then, the screw lid D3 is completely attached.

To remove the screw lid D3 from the mouth portion D1 of the drum can D, follow the reverse procedure. That is, if the whole is moved above the mouth portion D1 and the screw lid D3 and pressed downward, the whole is positioned through the guide portion 30 and the engagement blade 12 is engaged with the engagement protrusions D3c, D3c. After that, the motor M is started and the screw lid D
Rotate 3 in a counterclockwise direction. Since the removed screw lid D3 can be finally held under the guide portion 30, the entire screw lid D3 and the screw lid D3 can be retracted upward to complete the removal work.

In the above description, the motor M is preferably a constant torque motor so that the maximum generated torque can be appropriately variably set when the screw lid D3 is mounted. It is possible to properly manage the tightening torque of the screw lid D3. The same performance can be realized by incorporating a torque limiter at an arbitrary position on the way from the motor M to the engagement blade 12.

[0037]

[Other Embodiments] By making the drive shaft 11 expandable and contractable instead of the support cylinder 20, the engaging blades 12 can be projected and retracted below the guide portion 30 (FIGS. 6 and 7).

The inner cylinder 21 of the support cylinder 20 is formed to be short,
The intermediate cylinder 23 extends the inner cylinder 21 so that the inner cylinder 2
It is screwed to the lower part of 1. Also, the mounting cylinder 24 is
It is slidably fitted to both the inner cylinder 21 and the intermediate cylinder 23 and is urged downward through a compression spring 24c. The drive shaft 11 comprises a combination of a cylindrical fixed portion 11m connected to the shaft M1 of the motor M and a moving portion 11n slidably inserted into the fixed portion 11m.
Is attached to the lower end of the moving unit 11n.

At both upper and lower ends of the fixed portion 11m, the intermediate cylinder 2
Bearings 11f and 11f are interposed between the fixed part 11m and the fixed part 11m, and the fixed part 11m can be rotated via the shaft M1 of the motor M. In addition, the moving unit 11n includes the fixed unit 11n.
By the balls 11g, 11g mounted on the lower end of m projecting into the vertically long engaging recesses 11h, 11h,
The vertical movement range is restricted. However, the balls 11g, 11g are held in the holding holes 11k, 11k by the lower bearing 11f. Further, an upward shaft hole 11j is formed at the upper end of the moving portion 11n,
A compression spring 11e is mounted between the bottom surface of the shaft hole 11j and the lower end surface of the shaft M1. Therefore, the moving unit 11n
It is urged downward by the compression spring 11e.

The engaging blade 12 can partially project below the guide portion 30 when the moving portion 11n descends to the lower limit and the drive shaft 11 is extended to the maximum extent (solid line in FIG. 6). Therefore, in this state, the whole of the mouth portion D1 and the screw lid D
3 moves upward and is pressed downward, the whole is positioned through the guide portion 30 and the drive shaft 11 is shortened, so that the engaging blade 12 is engaged with the engaging protrusions D3c and D3c of the screw lid D3. Since it can be engaged with the screw lid (two-dot chain line in the same figure), the motor M can be activated thereafter to rotate the screw lid D3 in the clockwise direction, and the screw lid D3 can be attached to the mouth portion D1 (Fig. 7).

If the screw lid D3 attached to the mouth D1 is entirely moved to the upper side (the same figure) and the motor M is started to drive the screw lid D3 counterclockwise, the screw lid D3 is opened. Part D
Can be removed from 1. 6 and 7, the guide portion 30 does not include the set screws 31, 31, ..., It is not supposed to hold the screw lid D3, but the set screws 31, 31 ,. It may be omitted.

An air nipple 41 can be attached to the guide portion 30 (FIG. 8).

The air nipple 41 is connected to an air source (not shown) via a hose 41a, and air can be introduced into the guide portion 30 between the step portions 30a and 30b below the guide portion 30. it can. At this time,
An O-ring 42 for sealing and a seal ring 4 are provided between the upper surface of the inner cylinder 21 forming the support cylinder 20, between the inner cylinder 21 and the intermediate cylinder 23, and between the intermediate cylinder 23 and the guide portion 30, respectively.
3, an O-ring 44 is interposed, and a sealing O-ring 45 is also attached to the step portion 30a of the guide portion 30. That is, the O-ring 42, the seal ring 43, and the O-rings 44 and 45 allow the guide portion 30 to hold the screw lid D3, and when the guide portion 30 is fitted to the mouthpiece D2 of the drum can D to position the entire guide portion, The inner space of 30 can be hermetically sealed from the outside.

Therefore, a screw lid D is attached to the mouth portion D1 of the drum can D.
When air is introduced into the guide portion 30 through the air nipple 41 when the 3 is attached, the air nipple 41 is
Prior to mounting the screw lid D3, air can be enclosed in the drum can D through the mouth portion D1.

The air nipple 41 can also be attached to the guide portion 30 in the embodiment shown in FIGS. 6 and 7. However, also at this time, in order to hermetically seal the inner space of the guide portion 30 from the outside, an appropriate sealing member is attached to a key portion including a screw connection portion between the intermediate cylinder 23 and the inner cylinder 21. To do.

In the above description, the motor M is a drive source for rotating the drive shaft 11. Therefore, the motor M may be driven not only by electric drive but also by air as long as it can generate an appropriate rotation torque and rotate in the forward and reverse directions. In addition, the guide portion 30 includes the engagement blade 12
Appropriate openings may be formed in order to make it easier to confirm that the engagement projections D3c and D3c of the screw lid D3 are normally engaged. Further, the guide portion 30 may be formed not only in a skirt shape, but also by arranging a plurality of legs having step portions 30a and 30b inside in a circular shape. Step 30a,
30b is a mouthpiece D1 with a mouthpiece D2 and a screw lid D3, respectively.
This is because it suffices that the outer flange D3b is fitted from above and the entire body can be correctly positioned, and it is not necessary to be continuous in the circumferential direction.

Further, the opening / closing unit according to the present invention can be formed as an independent and portable tool, and is also incorporated in a production line for filling the drum can D with contents to perform a series of filling and sealing operations. It can also be used as an attachment for automatic machines.

[0048]

As described above, according to the present invention, by providing the drive shaft having the engaging blades, the support cylinder, and the guide portion, the guide portion is located above the mouth portion of the drum can. It is possible to rotate the screw lid forward and backward via the drive shaft by engaging with the screw lid to position the whole and engaging the blade with the screw lid. Therefore, there is an excellent effect that the working efficiency can be greatly improved, and that the tightening torque of the screw lid can be properly controlled very easily.

[Brief description of drawings]

FIG. 1 is an overall perspective explanatory view

FIG. 2 is an explanatory view of the entire vertical section

[Fig. 3] Operation explanatory diagram (1)

FIG. 4 is an enlarged view of a main part of FIG.

[Fig. 5] Operation explanatory diagram (2)

FIG. 6 is a view corresponding to FIG. 2 showing another embodiment (1).

FIG. 7 is a view corresponding to FIG. 3 showing another embodiment.

FIG. 8 is a view corresponding to FIG. 2 showing another embodiment (2).

[Explanation of symbols]

 D ... Drum can D1 ... Mouth portion D3 ... Screw lid 11 ... Drive shaft 12 ... Engaging blades 20 ... Support cylinder 30 ... Guide portion 41 ... Air nipple

Claims (5)

[Claims] 1. A drive shaft having an upper end connected to a drive source and having an engaging blade at the lower end for engaging with a screw lid of a drum can, a support cylinder coaxially accommodating the drive shaft, and a lower end of the support cylinder. And a guide part that is connected to the mouth part of the drum and is fitted from above. The engagement blade is projected and retracted below the guide part when one of the drive shaft and the support cylinder expands and contracts. An opening / closing unit for screw caps of drums, which is characterized by: 2. The opening / closing unit for a screw cap of a drum according to claim 1, wherein the guide portion is swingably connected to the support cylinder. 3. The opening / closing unit for a screw lid of a drum according to claim 1, wherein the guide portion is detachably connected to the support cylinder. 4. The opening / closing unit for a screw lid of a drum according to claim 1, wherein the guide portion can detachably hold the screw lid. 5. The opening / closing unit for a screw lid of a drum according to claim 1, wherein the guide portion is provided with an air nipple connected to an air source.