JPH0440132B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cold-fitting device, and more particularly to a cold-fitting device for cold-fitting a plug-shaped article into a hole in another article.

[Conventional technology]

Several types of devices have been proposed in the past for immersing an annular article in an ultra-low temperature refrigerant such as liquid nitrogen and then cold-fitting it into a hole in another article. Since the supply chute for the annular article is provided in the refrigerant, the article gripping device for grasping the article from the inside and inserting it into the hole of another article must also be immersed in the refrigerant. However, this configuration has the disadvantage that the operating portion of the article gripping device may freeze and become inoperable, or it may become brittle at low temperatures and break.

Moreover, the above-mentioned known device was developed for gripping an annular article having a hole concentric with the outer periphery from the inside and cold-fitting it into the hole of another article. It is not possible to cold-fit a plug-shaped article that cannot be gripped from the outside, and it is similarly impossible to cold-fit a plug-shaped article with an eccentric hole that can be gripped only from the outer circumference.

[Problem to be solved by the invention]

The present invention has been made in view of the above-mentioned state of the prior art, and an object of the present invention is to eliminate the drawbacks of the above-mentioned known devices and to provide plug-like articles or eccentric holes that cannot be handled by the above-mentioned known devices. An object of the present invention is to provide a novel cold-fitting device capable of cold-fitting plug-like articles with attached plugs. Another object of the present invention is that there is no need to immerse a gripping device in a refrigerant for gripping a plug-shaped article to be cold-fitted from the outside with movable gripping claws that can be opened and closed. It is an object of the present invention to provide a cold fitting device that is free from the possibility of device failure. Still another object is to cold-fit a plug-like article with an eccentric hole into a hole of another article with the eccentric hole positioned in a predetermined direction with respect to the axis of the plug-like article. An object of the present invention is to provide a novel cold-fitting device for a plug-shaped article.

[Means to solve the problem]

A first device invention according to the present invention is a cold-fitting device for plug-shaped articles, which includes: a refrigerant tank for immersing a plug-shaped article to be cold-fitted; an article storage container for storing the article; an article conveyance device that conveys the articles one by one from the storage container to a position near the refrigerant tank; and a plug-shaped article delivered from the article conveyance device that is immersed in the refrigerant bath and then pulled up to a predetermined location outside the refrigerant bath. an article cradle for holding in position;
The cooled plug-shaped article held on the article holder at the predetermined position is gripped by a movable gripping claw that can be opened and closed from the outside, and the article is driven into a hole in the workpiece etc. with a driving shaft. The present invention is characterized in that it includes an article gripping and driving device configured to hold and drive an article.

Similarly, a cold fitting device for a plug-like article with an eccentric hole as a second device invention includes a refrigerant tank for immersing a plug-like article with an eccentric hole to be cold-fitted, and an article for storing the article. a storage container, an article transport device that transports the articles one by one from the article storage container to a position near the refrigerant tank, and a plug-shaped article with an eccentric hole delivered from the article transport device, immersed in the refrigerant tank. an article pedestal that is pulled up and held at a predetermined position outside the refrigerant tank after the product has been cooled; and a plug-shaped article with an eccentric hole that is delivered from the article conveying device onto the article holder before the article is immersed in the refrigerant tank. an article orientation indexing device that indexes the eccentric hole in a predetermined direction about the axis of the article; and a plug with an eccentric hole after cooling that is held on the article holder and has the eccentric hole indexed in a predetermined direction. The present invention is characterized by comprising an article gripping and driving device which grips a shaped article with movable gripping claws that can be opened and closed from the outside and drives the article into a hole in a workpiece etc. with a driving shaft. It is something.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic front view of an assembly device, etc., including a device according to an embodiment of the present invention. In the same figure, B is bed,
C is a support and G is a girder. At the center of the bed B is a workpiece conveying device 1 extending in a direction perpendicular to the plane of the paper.
The workpiece W is conveyed by the apparatus 1 in a direction perpendicular to the plane of the paper. A cold fitting device 3 of the present invention including a refrigerant tank 2 containing a refrigerant such as liquid nitrogen is installed on one side of the workpiece conveying device 1. This cold fitting device 3 includes a portion shown in FIG. 1 and a portion shown in FIG. 2. Below, with reference to FIGS. The configuration of the tight fitting device 3 will be explained.

That is, the cold fitting device 3 in the device of this embodiment is composed of a combination of each of the partial devices (i) to (vi) described below.

(i) Refrigerant tank 2. (iii) A cylindrical article storage container 4 (FIG. 2) in which plug-shaped articles to be cold-fitted to the workpiece W are stored in a stacked state. (iii) An article conveyance device 5 that takes out plug-shaped articles one by one from the article storage container 4 and conveys them to a position above the refrigerant tank 2, and also serves as a shutter at the bottom of the article storage container 4. (iv) An article holder 6 that receives a plug-shaped article from the article conveyance device 5 above the refrigerant tank 2 and immerses the article in the refrigerant after a positioning operation by an article orientation correction device (described later). (v) An article orientation indexing device 7 that positions the plug-shaped article transferred from the article conveyance device 5 onto the article holder 6 so that it faces a predetermined direction on the article holder 6. (vi) The plug-shaped article on the article holder 6 that has been immersed in the refrigerant and then pulled up from the refrigerant is gripped by a movable gripping claw that can be opened and closed from the outside, and the article is inserted into the hole of the workpiece. An article gripping and driving device 8 for driving by a driving shaft.

Next, the structure and operation of the partial devices (i) to (vi) will be explained. As shown in FIG. The member 9 is connected to the piston rod 11A of the cylinder 11 via the connecting member 10, and is supported on the guide 12 while moving between the solid line position and the two-dot chain line position in FIG. 2 along the bottom outlet of the article storage container 4. move between A bracket 13 is fixed to the rear end of the rod-shaped member 9, and an article detection rod 14 is supported on the bracket 13 so as to be movable in the axial direction. The article detection rod 14 is designed to be able to enter the article storage space through a hole near the bottom of the article storage container 4, and is always kept forward (left side in FIG. 2) by a spring 15.
It has been energized in the past. Dogs 16 and 17 are attached to the rear end of the article detection rod 14,
The dogs 16 and 17 are adapted to engage limit switches, not shown.

The tip of the rod-shaped member 9 is lower than other parts in order to receive a plug-shaped article P as shown in FIGS. 3a and 3b from the article storage container 4, and
It is formed into a fork shape as shown in FIG. 5 so that articles can be easily transferred to an article receiving stand 6, which will be described later.

The article pedestal 6 is a cylinder 18 fixed to the column C.
It is attached to the piston rod of the piston rod and moves up and down between the solid line position and the two-dot chain line position in FIG. The article is supported and then lowered into the refrigerant L in the refrigerant tank 2 to cool and shrink the article. As shown in FIG. 5, at the tip of the article holder 6, a narrow groove 6a for receiving the tip of the rod-shaped member 9 is formed, and a leaf spring S for pressing the outer circumference of the plug-shaped article P is provided. There is. Further, as shown in FIG. 4, a layer 19 of heat insulating material is provided in the upper part of the article holder 6 to prevent the transfer of cold and heat.

On the bed B, a support shaft 20 is rotatably supported on a frame F (FIG. 1) extending above the refrigerant tank 2, and the support shaft 20 has an article orientation index shown in FIG. The device 7 is fixed so as to be rotatable between the solid line position and the two-dot chain line position in FIG. The support shaft 20 is connected to the link 2 as shown in FIG.
1 to a piston rod 23 of a cylinder 22, and the cylinder 22 rotates the entire article orientation and indexing device 7 about the axis of a support shaft 20.

The article orientation indexing device 7 is arranged so that the cold-fit sliding plug-like article P is aligned with the eccentric hole h as shown in FIGS. 3a and 3b.
If the article is a plug-shaped article, the orientation of the eccentric hole h with respect to the axis of the article is positioned in a predetermined direction, so that the plug-shaped article can be easily grasped and handled from the outside, and the article can be processed easily. This is provided for the purpose of determining the orientation of the eccentric hole h and allowing the product to be transported correctly. The device 7 has a shaft 24 extending in the vertical direction as shown in FIGS. 6 and 7, and a projection 25a that can be inserted into the eccentric hole h of the plug-shaped article P at the lower end of the shaft 24. An article engaging portion 25 having a diameter is attached.

A pinion 26 is provided above the article engaging portion 25, and this pinion 26 is fitted into the rack of a rack rod 27 extending perpendicularly to the plane of the paper in FIGS. 6 and 7 within the device 7. It matches. A collar 28 and a dog 29 are also attached to the shaft 24, and the shaft 24 is always urged downward by a spring 31 interposed between the collar 28 and the top plate 30 of the apparatus.

A dog 29 and a tilting limit switch 32 are provided on the top plate 30 of the apparatus, and this limit switch 32 is connected to the article engaging portion 25 as will be explained later.
It is designed to detect that the protrusion 25a of the plug-shaped article P is fitted into the eccentric hole h.

The article gripping and driving device 8 grips the plug-shaped article, which is positioned on the article holder 6 by the article orientation indexing device 7 and cooled with a refrigerant, from the article holder 6 by gripping it from the outside. This is a device that drives the workpiece into the hole in the workpiece W after the workpiece has been inserted, and is supported by a carriage 33 suspended on the girder G as shown in FIG. 35.

A cylinder 36 is fixed to the carriage 33,
A piston 37 is fitted into the cylinder 36 as shown in FIG. The piston 37 is integral with a driving shaft 38 that hangs down within the lower extension of the carriage 33, and is connected to the upper extension 3 of the driving shaft 38.
9 protrudes above the cylinder 36. Several dogs 40-42 are attached to the upper extension 39, and limit switches 43 corresponding to these dogs are attached to the carriage 33.

A driving shaft 38 is located within the downward extension of the carriage 33.
An outer cylindrical member 45 is provided so as to be movable in the axial direction relative to the outer cylindrical member 45, and a ninth
Hollow part 4 opened downward as shown in the figure
6 is provided. The lower end of the outer cylindrical member 45 also serves as a fixed gripping piece that engages with the outer periphery of the plug-shaped article P, but a part of it is cut out to form a window 47. A movable gripping claw 48 is arranged.

The movable gripping claw 48 is in a suspended state with its protruding portion 50 supported in a slot 49 provided in the outer cylinder member 45, and the movable gripping claw 48 is in a suspended state. The protruding portion 50 is lightly suppressed from the inside by the large diameter portion cylindrical surface. The cam member 51 is a sleeve-shaped member fitted to the tip of the driving shaft 38 in the hollow portion 46 and has a conical cam surface 5.
1a, an upper small diameter portion, and a lower large diameter portion. The movable gripping claw 48 is swingable about its protruding portion 50, and its upper end is connected to the cam member 51.
is in contact with the outer periphery of the

A ring 53 having a protrusion 52 at the tip of the shaft 38 is fitted into the inner core extending in the hollow part 46, and the protrusion 52 prevents the eccentricity of the plug-shaped article P when the plug-shaped article P is gripped. It is designed to be inserted into hole h. End face of ring 53 and cam member 51
The end face of the cam member 51 is the part that comes into contact with the upper surface of the plug-shaped article P, and both ends are on the same plane. 52 protrudes from the lower end surface of the cam member 51.

The collar 55 fixed to the driving shaft 38 is the outer cylinder member 45
The hollow portion 46 is moved by a spring 56 that is housed in the hollow portion 46 and constantly biases the driving shaft 38 upward.
It is pressed against the upper end wall surface. The outer cylindrical member 45 is prevented from rotating by a detent 57 that clamps the outer periphery thereof, and is moved up and down relative to the carriage 33 along a guide rail 58 that guides the detent 57 in the vertical direction. Supported for movement.

Next, the operation of the apparatus according to the embodiment of the present invention having the above-mentioned configuration will be explained.

(a) When the device starts operating, the rod member 9 of the article conveying device 5 has retreated to the position indicated by the two-dot chain line in FIG. It is located in Therefore, the shutter of the article storage device 4 is opened, and the plug-shaped article P is supported at the tip of the rod-like member 9 at the lowest end in the article storage device 4.

On the other hand, the article orientation indexing device 7 has been inverted to the position shown by the two-dot chain line in FIG. position). On the other hand, the article holder 6 is waiting at a slightly lower height position than the rod-shaped member 9.

(b) When the cylinder 11 is actuated and the rod-shaped member 9 moves forward toward the article holder 6, only one plug-shaped article supported by the fork-shaped portion at the tip of the rod-shaped member 9 moves toward the article holder 6. Once transported,
At the same time, the rod-shaped member 9 closes the bottom outlet of the article storage container 4. When the fork-shaped portion at the tip of the rod-shaped member 9 enters into the groove 6a of the article holder 6, the operation of the cylinder 11 is stopped, and when the article holder 6 is then slightly raised, the plug-shaped article P on the rod-shaped member 9 is removed. is transferred onto the article holder 6.
Then, the rod-shaped member 9 retreats to the position shown in two-dot chain line in FIG.

(c) The article orientation indexing device 7 moves the support shaft 2 from the two-dot chain line position in FIG. 6 to the solid line position by the cylinder 22.
It is rotated around 0 and comes to rest at a position directly above the article holder 6. At this time, the axis of the shaft 24 coincides with the axis of the plug-shaped article P, but since the protrusion 25a of the article engaging part 25 has not yet entered the eccentric hole h of the plug-shaped article P, as shown in FIG. As shown, the entire shaft 24 is pushed up by the plug-shaped article P, and the dog 29 and limit switch 32 are not engaged.

(d) When the rack rod 27 is driven by the cylinder (not shown) of the article orientation indexing device 7 in a direction perpendicular to the plane of the paper in FIG. As a result, the protrusion 25a of the engaging portion 25 is inserted into the plug-shaped article P.
slides in an arc on the upper surface of the projection 25.
a falls into the eccentric hole h of the plug-shaped article P. During this time, the plug-shaped article P is held down by the leaf spring S on the article holder 6, so it does not rotate.

When the protrusion 25a falls into the eccentric hole h, the shaft 24
is lowered as a whole, the dog 29 and the limit switch 32 are engaged, and the protrusion 25a is inserted into the eccentric hole h.
It is detected that the From this point on, by making the rack rod 27 perform a predetermined stroke, the plug-shaped article P can be rotated by a predetermined angle together with the article engaging portion 25, and a line connecting the axis of the plug-shaped article P and the center of the eccentric hole h can be drawn. can be positioned in a predetermined direction.

(e) When the eccentric hole positioning operation is completed as described above, the article holder 6 is lowered by the cylinder 18 to the position indicated by the two-dot chain line in FIGS. 1 and 2, and the article P is placed inside the refrigerant tank 2. immersed in refrigerant L.
At the same time, the cylinder 22 reverses the article orientation device 7 to the position indicated by the two-dot chain line in FIG. 6, so that the device 7 stands by in its inoperative position.

(f) After the plug-shaped article P is immersed in the refrigerant, the article holder 6 rises to its original position. Then, the tip portion of the article gripping and driving device 8 is lowered by the operation of the cylinder 36, and the plug-shaped article P on the article pedestal 6 is lowered.
is gripped from the outside by movable gripping claws 48. In this case, the projection 52 at the tip of the device 8 is aligned with the eccentric hole h of the plug-shaped article P, so when the plug-shaped article P is gripped as shown in FIG. 9, the projection 52 is inserted into the eccentric hole h. The state will be as follows.

(g) After the plug-shaped article P is lifted from the article pedestal 6 by the article gripping and driving device 8, the carriage 33 is moved by the cylinder 34 to a position directly above the workpiece conveying device 1. Subsequently, the plug-shaped article P is lowered toward the workpiece W on the apparatus 1 by the operation of the cylinder 36, and then the plug-shaped article P is moved toward the workpiece W on the apparatus 1, as shown in FIGS. 10 to 12. into hole H. That is, when the piston 37 is lowered and the driving shaft 38 is lowered, the plug-shaped article P is inserted into the hole H as shown in FIG. Since it is not applied, the driving shaft 38 and the outer cylinder member 45 descend as one. When the plug-shaped article P is further inserted into the hole H and the tip of the outer cylinder member 45 and the tip of the movable gripping claw 48 collide with the upper surface of the workpiece W as shown in FIG. The predecessor of was stopped,
Only the driving shaft 38 is lowered. For this reason, spring 5
6 is compressed, the collar 55 of the driving shaft 38 separates from the end surface of the outer cylindrical member 45 and descends within the hollow portion 46, and at the same time, the cam member 51 also descends relative to the movable gripping claw 48. Therefore, since the upper end of the movable gripping claw 48 moves from the thick portion to the thinner portion of the cam member 51, the gripping claw 48 is swung clockwise about its protruding portion 50 as a fulcrum, and as a result, the movable gripping claw The lower end of the claw 48 can be separated from the outer periphery of the plug-shaped article P. As a result, the grip of the plug-shaped article from the outside is released, and by further lowering the driving shaft 38, the plug-shaped article P is completely driven into the hole H as shown in FIG. 12.

As described above, since the apparatus of the present invention is provided with an article holder for immersing a plug-shaped article in a refrigerant, the article gripping and driving device for gripping the article from the outside and inserting the article into the refrigerant is There is no need for immersion in the product, and there is no risk of inoperability or damage to the article gripping and driving device. Furthermore, since the apparatus of the present invention is provided with an article orientation indexing device, it is possible to handle plug-shaped articles with eccentric holes, which conventional cold-fitting apparatuses could not handle.

In addition, in FIG. 2, FIG. 6, etc., each device such as the article orientation indexing device is illustrated and explained as having only one unit, but in reality, these devices (article receiving stand 6, article conveying device 5, article orientation The indexing device 7, the article gripping/driving device 8, etc.) can be integrated with each other in a direction perpendicular to the plane of the paper in FIG. 2, and can be arranged in large numbers in parallel. In this way, multiple plug-like articles can be simultaneously indexed and cooled, and then cold-fitted into multiple holes in a workpiece at the same time.

The embodiments described above do not limit the present invention, and the present invention can also be implemented by replacing each device part shown in the above embodiments with an equivalent mechanism. For example, the structure of the article orientation indexing device 7 may be such that the shaft 24 is directly driven by a small motor instead of a rack-and-pinion mechanism. A configuration may be adopted in which a counter is connected to the rack rod 27 or the shaft 24 for detection, and the limit switch 32 is incorporated into the circuit of the counter.

Furthermore, although the rod-shaped member 9 is used as the article conveyance device 5 in the embodiment, a conveyance device equivalent to a locking device other than this may be employed.

〔Effect of the invention〕

According to the present invention, it is possible to cold-fit a plug-shaped article or a plug-shaped article with an eccentric hole that cannot be handled by the conventional apparatus, without the drawbacks of the conventional cold-fitting apparatus of this type. Furthermore, there is no need to immerse the gripping device for gripping the plug-shaped article to be cold-fitted into the coolant, and therefore there is no risk of failure of the gripping device. Furthermore, a plug-shaped article with an eccentric hole can be cold-fitted into a hole of another article while being positioned in a predetermined direction with respect to the axis of the plug-shaped article.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an embodiment of the cold fitting device for a plug-shaped article of the present invention, FIG. 2 is a schematic diagram showing an enlarged portion not drawn in FIG. 1, and FIG.
The figure is a schematic diagram showing an example of a plug-shaped article with an eccentric hole that can be handled by the apparatus of the present invention, in which a is a longitudinal sectional view and b is a plan view. FIG. 4 is an enlarged view of the portion shown in FIG. 2, FIG. 5 is an enlarged plan view of a portion of FIG. FIG. 8 is a longitudinal sectional view of the article gripping and driving device, FIG. 9 is an enlarged view of a portion of FIG. 8, and FIGS. 10 to 12 are explanatory diagrams of the article driving operation. 1...Workpiece conveyance device, W...Workpiece, B...Bed, C...Column, F...Frame, G...Girder, 2...Refrigerant tank, 3...Cold fitting device, 4...Goods storage container, P...
Plug-shaped article, 5... article conveyance device, 6... article pedestal, 7... article orientation indexing device, 8... article gripping and driving device, 9... rod-shaped member, 10... connecting member, 11...
Cylinder, 12...Guide, 13...Bracket, 1
4... Article detection rod, 15... Spring, 16, 17... Dog, 18... Cylinder, 19... Heat insulating material layer, 20... Support shaft, 21... Link, 22... Cylinder, 23... Piston rod, 24... Shaft, 25... Article Engagement part, 26
...Pinion, 27...Rack, 28...Collar, 29
...Dog, 30...Top plate, 31...Spring, 32...Limit switch, 33...Carriage, 34, 36...
Cylinder, 37... Piston, 38... Driving shaft, 45
...Outer cylinder member, 46...Hollow part, 48...Movable gripping claw,
51...Cam member, 52...Protrusion, 53...Ring, 5
4, 56... Spring, 57... Rotation stopper, 58... Guide rail.

Claims (1)

[Scope of Claims] 1. A refrigerant tank for immersing a plug-shaped article to be cold-fitted, an article storage container for storing the article, and a position in the vicinity of the refrigerant tank for transporting the article from the article storage container. an article conveyance device that conveys the plug-shaped articles one by one to the refrigerant tank; an article holder that immerses the plug-shaped articles delivered from the article conveyance device into the refrigerant tank and then pulls them up and holds them at a predetermined position outside the refrigerant tank; A cooled plug-shaped article held on the article holder is gripped by a movable gripping claw that can be opened and closed from the outside, and the article is driven into a hole in a workpiece or the like by a driving shaft. A gripping and driving device,
An apparatus for cold-fitting a plug-shaped article, characterized by comprising: 2. A refrigerant tank for immersing a plug-shaped article with an eccentric hole to be cold-fitted, an article storage container for storing the article, and one article from the article storage container to a position near the refrigerant tank. an article conveyance device that conveys the article by itself; an article holder that immerses the plug-shaped article with an eccentric hole delivered from the article conveyance device into the refrigerant tank and then pulls it up and holds it at a predetermined position outside the refrigerant tank; an article orientation indexing device that indexes the eccentric hole in a predetermined direction with respect to the axis of the article before immersing the plug-shaped article with the eccentric hole, which is delivered from the device onto the article pedestal, into the refrigerant tank; ,
A cooled plug-shaped article with an eccentric hole held on the article pedestal and with the eccentric hole indexed in a predetermined direction is gripped by a movable gripping claw that can be opened and closed from the outside, and the hole of the workpiece, etc. 1. An apparatus for cold-fitting a plug-shaped article with an eccentric hole, comprising: an article gripping and driving device configured to drive the article with a driving shaft.