JPH0239703Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The invention is used for inserting a ring part (e.g., a valve seat) into a hole in a workpiece (e.g., an intake port or an exhaust port of a cylinder head). This invention relates to a ring component insertion device.

(Prior Art) Generally, ring parts (e.g. valve seats)
When inserting a ring part into a hole in a workpiece (for example, an intake port or an exhaust port of a cylinder head), the ring part is usually clamped with an appropriate clamp member, and then positioned and inserted into the hole in the workpiece. There is almost no clearance between the outer diameter of the part and the inner diameter of the hole in the workpiece, and unlike press-fitting, the inserted ring part is not fixed in the hole. It was extremely difficult to separate from the ring parts.

Therefore, in view of the above points, various methods have been devised as means for clamping ring parts. For example, as described in Japanese Utility Model Application Publication No. 59-1533,
The clamp member that clamps the ring part is forcibly clamped or unclamped,
A device that makes it easy to remove the clamp member from the ring component after insertion, or
As described in Japanese Patent No. 55-156830, there is a device in which a ring component is clamped using elastic force to facilitate positioning of the ring component and a workpiece hole during insertion.

(Problems to be solved by the invention) However, the following problems remain in the above-mentioned known technology.

That is, in the case of the former structure (Japanese Utility Model Publication No. 59-1533), the clamp member can be easily removed from the ring part after the ring part is inserted into the hole of the workpiece, but the clamp member When there is a slight misalignment between the axes of the ring part and the workpiece hole, the problem remains that it is very difficult to align the ring part and the workpiece hole when inserting the ring part. In the case of a structure such as that shown in Japanese Patent Publication No. 156830/1983, it is easy to align the ring part and the hole of the workpiece when inserting the ring part, but it is difficult to separate the clamp member from the ring part after inserting the ring part. This makes it difficult for the ring component to fall out of the workpiece hole as the clamp member moves.

This invention was made in view of the above points,
By making it easy to align the ring part with the hole of the workpiece when inserting the ring part, and making it easy to separate the clamp member and the ring part after inserting the ring part, the ring part can be easily aligned with the clamp member. The purpose of this is to prevent the ring from moving when the ring is attached, thereby facilitating the ring component insertion work and preventing the ring component from falling off after insertion.

(Means for Solving the Problems) In the present invention, as a means for solving the above problems, there is a gap between the ring part preparation position where the ring part is prepared and the insertion work position where the ring part is inserted into the hole of the workpiece. A movable body whose movement is controlled by a movable member is driven to open and close to clamp and unclamp the ring part from its inner side, and to swing a plurality of clamp claws biased in the opening direction by a spring. A driving rod that supports a pin and has two locking parts spaced apart from each other by a predetermined distance to lock the movable body in order to clamp or unclamp the clamp claw, and to reciprocate the driving rod. Further, a fixed stopper is provided in the middle of the movement trajectory of the movable body to abut on the control cylinder or the drive rod to restrict the non-latching position of the drive rod with respect to the clamp claw.

(Function) In the present invention, the following effects can be obtained by the above means.

That is, by locking one locking portion of the drive rod with the clamp pawl, the clamp pawl is opened and the ring component is forcibly clamped, and the other locking portion of the drive rod is locked with the clamp pawl. By stopping, the clamp claw is operated to close and the ring part is forcibly unclamped. Therefore, the ring component is reliably clamped between the ring component preparation position and the insertion work position, and
After insertion, the clamp claw can be easily removed from the ring component.

Furthermore, when the non-latching position of the drive rod is restricted by the fixed stopper, the forced driving action on the clamp pawl is released, and the clamp pawl is supported floating only by the biasing force of the spring. This facilitates positioning when inserting parts.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 5, this ring component insertion device consists of a fixed frame 1 fixed to a suitable base, and a movable frame 2 supported so as to be horizontally moved by a drive cylinder 3 relative to the fixed frame 1. , and a movable body 6 supported by an elevating cylinder 5 so as to be movable up and down with respect to the movable frame 2.

The movable frame 2 is connected to a piston rod 4 of a drive cylinder 3, and is configured to be able to move horizontally as the piston rod 4 moves back and forth.

The movable body 6 is connected to a piston rod 7 of the elevating cylinder 5, and is configured to be able to move up and down as the piston rod 7 advances and retreats, and is moved by clamp claws 9, 9, 9 attached to its tip. The ring part (valve seat in this example) 12 that is clamped is placed on a jig 23 located below the movable body 6 and fixed to the hole in the workpiece (cylinder head in this example) 21. It is used to insert into the 22 (in this embodiment, the intake port or the exhaust port). Reference numeral 26 is a guide member that guides the movable body 6 when moving up and down.

As shown in FIGS. 1 and 2, the head portion 6a at the tip of the movable body 6 is provided with three clamp claws 9, 9, which are configured to hold the ring part 12 by an opening action. 9 are pins 1 at equal intervals in the circumferential direction.
It is swingably supported by 0, 10, 10.

Each of the clamping claws 9 is located at the lower end thereof, and when clamping (in other words, opening operation), the ring part 1
2, and an engagement protrusion 9b that is located above and inward of the pin 10, which is the center of swing, and serves as the point of action when swinging the clamp claw 9. It is equipped with

Further, each of the clamp claws 9 is always urged by a spring 11 in the opening direction (in other words, in the clamping direction) with respect to the head portion 6a.

On the other hand, inside the movable body 6, there is a vertical sliding hole 2.
4 is formed, and a drive rod 14 is fitted into the sliding hole 24 so as to be movable up and down. At the lower end of the drive rod 14, upper and lower locking portions 15 and 16 are formed at a predetermined interval and are selectively locked to the engaging protrusion 9b of the clamp claw 9. The distance between these upper and lower locking portions 15 and 16 is determined according to the vertical stroke of the drive rod 14. A connecting rod 19 is provided at the upper end of the driving rod 14 and projects outward from an opening 25 formed in the upper part of the movable body 6 to communicate with the sliding hole 24. A piston rod 18 of a control cylinder 17 for raising and lowering the drive rod 14 is connected to the outer end. The piston rod 18 passes through the control cylinder 17 in the vertical direction,
The upper end portion 18a is configured to come into contact with a fixed stopper 20 fixed to the fixed frame 1 during the upward movement of the piston rod 18. The fixed stopper 20 is connected to the control cylinder 1
By bringing the upper end 18a of the piston rod 18 into contact with the upper end 18a of the piston rod 18 during the operation of the piston rod 7, the piston rod 18 is stopped during the operation, and a clamp claw is inserted between the locking portions 15 and 16 of the drive rod 14 linked to the piston rod 18. 9 is positioned so that the engaging protrusion 9b is positioned. At this time, the air supply to the control cylinder 17 is stopped, and the piston rod 18 is placed in the neutral position. In other words, by restricting the upward movement of the piston rod 18 by the fixed stopper 20, the drive rod 1
It functions to restrict the non-latching position of the clamp claw 4 and release the forced drive for clamping or unclamping the clamp claw 9.

Thus, the control cylinder 17 moves the drive rod 14 up and down through the connecting rod 19 connected to the piston rod 18, and the upper and lower locking portions 15 and 15 at the lower end of the drive rod 14
16 is selectively engaged with or disengaged from the engagement protrusion 9b of the clamp claw 9, and the clamp claw 9 is forcibly driven into the opening operation and the closing operation. This is to release the drive. Here, as the control cylinder 17, an air cylinder is adopted.

Next, the operation of the illustrated ring component insertion device will be explained.

First, drive the drive cylinder 3 to move the movable frame 2.
After horizontally moving the ring component to the ring component preparation position shown by the chain line in FIG. A ring component (in this embodiment, a valve seat) 12 is clamped (see FIGS. 1 to 3). This clamp
As shown in the solid line diagram in FIG. 3 and FIG.
This is done by locking to b. That is, as the drive rod 14 descends, the engaging protrusion 9 of the clamp claw 9
When the ring member b is engaged with the upper engagement portion 15 of the drive rod 14, the clamp claws 9, 9, 9 are opened and the ring component 12 is clamped.

Next, the ring parts 12 are attached to the clamp claws 9, 9, 9.
After the movable body 6 is returned to its original position by driving the elevating cylinder 5 in a clamped state, the movable frame 2 is returned to the insertion work position shown by the solid line in FIG. 5 by actuation of the drive cylinder 3. After that, the control cylinder 17
When the piston rod 18 is raised by operating the piston rod 18, the upper end 18a of the piston rod 18 comes into contact with a fixed stopper 20 and its upward movement is restricted. At this time, the air supply to the control cylinder 17 is stopped and the piston rod 18 assumes a neutral position. In such a situation, FIGS. 1 and 3
As shown in chain lines in the figure, the engaging protrusion 9b of the clamp claw 9 is connected to the upper and lower locking parts 1 of the lower end of the drive rod 14.
5, 16, and the clamp claws 9, 9, 9
The ring component 12 is held only by the urging force of the springs 11, 11, and 11, respectively. Therefore, the ring part 12 is floatingly supported by the clamp claws 9, 9, 9, and can swing slightly in the radial direction in the clamped state. .

In this state, the lifting cylinder 5 is operated to lower the movable body 6, and the ring part 12 clamped at the tip of the movable body 6 is transferred to the workpiece (in this embodiment) on the jig 23 located below. , cylinder head) 21 (in this embodiment, the intake port or exhaust port) 22 (shown in solid line in FIG. 5). At this time, even if there is some misalignment between the axes of the movable body 6 and the hole 22 of the workpiece 21, the ring part 12 is only affected by the biasing force of the springs 11, 11, 11 acting on the clamp claws 9, 9, 9. Since the ring part 12 and the hole 22 are supported in a floating manner, alignment of the ring part 12 and the hole 22 can be performed extremely easily.

Therefore, the ring part 12 is connected to the hole 2 of the workpiece 21.
2, the control cylinder 17
When the piston rod 18 is further raised by reactivating the piston rod 18, the drive rod 14 interlocking with the piston rod 18 rises, and the lower locking part 16 at the lower end of the drive rod 14 engages with the engagement protrusion 9b of the clamp claw 9. The clamp claw 9 is then engaged in a closing operation as shown in FIG. That is, the clamp claw 9,
The clamping force applied to the ring part 12 by the members 9 and 9 is released, and the movable body 6 can be easily removed from the ring part 12. In other words, ring part 1
2 is kept inserted into the hole 22 of the workpiece 21.

As described above, according to this embodiment, the clamp claw 9 forcibly clamps the ring part 12 or clamps the ring part 12 against the spring 11 by the actuation of the drive rod 14 and the control cylinder 17.
By floatingly supporting the ring component 12 or forcibly unclamping it by the biasing force of This allows reliable unclamping to be performed as a series of operations.

In the above embodiment, the fixed stopper 20
Although the piston rod 18 of the control cylinder 17 is configured to restrict the upward movement, it may be configured to restrict the upward movement of the drive rod 14.

It should be noted that the present invention is not limited to the illustrated embodiment, and it goes without saying that the design can be changed as appropriate without departing from the gist of the invention.

(Effects of the invention) As described above, according to the invention, the clamp claw supported by the movable body with a pin in a swingable manner is biased in the opening direction by the spring, and the clamp claw is biased in the opening direction by the spring. After the ring part is forcibly clamped by the clamp claw, the non-latching position of the control cylinder or the drive rod is restricted by the fixed stopper, so that the ring part can be supported floating only by the biasing force of the spring. This has the practical effect of making it extremely easy to align the ring component when inserting the ring component.

Further, after the ring component is securely clamped by forcibly driving the clamp claw in the opening direction, and after the ring component is inserted, the clamp claw can be easily separated from the ring component by forcibly driving the clamp claw in the closing direction. Therefore, the ring component can be reliably clamped or unclamped, and there is also an effect that the ring component will not fall off as the movable body moves after insertion.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the main parts of a ring component insertion device according to an embodiment of the present invention, and FIG.
Fig. 3 is an enlarged sectional view of the main part of Fig. 1, and Fig. 4 is a third sectional view showing the state in which the clamp claw is closed and retracted in the ring component insertion device of Fig. 1.
FIG. 5 is a partially sectional side view of the ring component insertion device according to the embodiment of the present invention. 6... Moving body, 9... Clamp claw, 10... Pin, 11... Spring, 12... Ring parts,
14... Drive rod, 15, 16... Locking part, 1
7... Control cylinder, 20... Fixed stopper, 21... Workpiece, 22... Hole.

Claims (1)

[Scope of utility model registration request] A movable body whose movement is controlled between a ring component preparation position where a ring component is prepared and an insertion work position where the ring component is inserted into a hole of a workpiece, and a movable body that is swingably supported by a pin and driven to open and close. a plurality of clamp claws for clamping and unclamping the ring part from the inside thereof; a spring for biasing the clamp claws in the opening direction; and a spring provided on the movable body for clamping the clamp claws. Alternatively, a drive rod in which two locking portions for unclamping are formed at a predetermined interval, a control cylinder for reciprocating the drive rod, and a control cylinder attached to the moving body midway through the movement trajectory,
A ring component insertion device characterized by comprising a fixed stopper that comes into contact with the control cylinder or the drive rod to restrict the non-latching position of the drive rod with respect to the clamp claw.