JPH0445781Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a device that is placed in an engine assembly line or the like and assembles two gripped parts by correcting the distance between them to a predetermined distance.

2. Description of the Related Art Examples of tools for assembling parts include tools for assembling engine valves. This is a tool for assembling a valve into the valve guide hole formed in the intake port or exhaust port of the cylinder head.In order to increase work efficiency, this assembly tool is designed to assemble two valves at the same time. Each chuck device is positioned so that the spacing between the two valves each gripped by the chuck device matches the pitch of the valve guide hole formed in the cylinder head. Therefore, when using this assembly tool, it is necessary to arrange the valves on the pallet in advance according to the pitch of the valve guide holes, but with this method, the number of valves that can be set on the pallet is small. It was inefficient.

In addition, in order to improve the filling efficiency of the pallet, the pitch of the valve on the pallet may be made narrower than the pitch of the valve when actually assembled (the same pitch as the pitch of the valve guide holes). With the assembly tool mentioned above, it is not possible to assemble two valves at the same time because the distance between the two chuck devices is fixed, and generally the valve is assembled with the assembly tool using uniaxial NC control. They were assembled one by one.

Problems to be Solved by the Invention However, the above-mentioned conventional parts assembly tools had a problem in that it took time to assemble the valves one by one using single-axis NC control. Additionally, in the assembly process of recent engines, where the number of valves per cylinder has increased to two or four, assembling valves one by one cannot keep up with the tact time required for mass production. There was a problem that there was no.

In addition, as a device similar to an assembly tool, a double-arm loader that supplies a workpiece to a machine tool (Japanese Patent Application Laid-open No. 55-77442 and Utility Model Application No. 57-23943)
However, these devices feed a single workpiece to a machine tool and take it out after machining, and each of the two arms has a chuck at each end to grip the workpiece. , it is not designed to handle two workpieces at the same time,
Also, because both arms move forward and backward alternately, the distance between the chucks changes, but this is simply a change in distance due to the forward and backward movement of both arms, and is not for the purpose of adjusting the distance between the chucks. do not have.

This idea was created in view of the above problems.
It is a general-purpose product that allows adjustment of part spacing, shortens the time required to correct part spacing in response to the reduction in takt time associated with mass production, and can also handle assembly work of parts with different assembly spacings. The purpose is to provide tools for mold assembly.

Means for Solving the Problems As a means for solving the above-mentioned problems, this invention consists of a pair of movable blocks each integrally provided with a chuck device for individually gripping parts, and at least one of the movable blocks being connected to each other. a guide member that guides the movable block toward and away from the movable block; a drive rod that is moved back and forth in a direction perpendicular to the moving direction of the movable block; and a drive rod that protrudes outward in a radial direction in correspondence with the movable block. The movable block is characterized in that it includes a formed protrusion and an abutment means provided on the movable block so as to be pressed against the drive rod.

Function: In this invention, the distance between the movable blocks, that is, the distance between the chuck devices, is determined by the contact means provided on each movable block being in contact with the drive rod. Therefore, when the drive rod is moved back and forth and the contact means is brought into contact with the protrusion formed on the drive rod, the movable block is pushed radially outward on the drive rod by the protrusion, and as a result, , the distance between the movable blocks, that is, the distance between the chuck devices becomes wider. Therefore, with this invention, the spacing between the parts gripped by the chuck device can be corrected to match the spacing between the parts at the time of assembly, and the spacing between the parts set on the pallet can be adjusted to the spacing between the parts at the time of assembly. Pallets can be used more efficiently as they are no longer needed. Furthermore, by replacing the drive rod with a drive rod having a different protrusion dimension, the present invention can be easily applied to parts having different spacings.

Embodiment Hereinafter, an embodiment in which this invention is applied to an automatic assembly tool with a part spacing correction function for assembling a valve to a cylinder head of an engine will be described with reference to FIGS. 1 to 3.

The automatic assembly tool 1 includes a substantially rectangular frame 2 that is open in the vertical direction, and two guides that are disposed horizontally and parallel to each other with their respective ends supported on opposing walls of the frame 2. Rods 3, 3 and chuck devices 4a, 5a for gripping parts are provided at the bottom of each, and both guide rods 3, 3 are inserted into the top of the rods so that they can slide toward or away from each other. A pair of arranged blocks 4,
5, and a correction drive disposed approximately horizontally in a direction orthogonal to the guide bars 3, 3, at a position close to and above the guide bars 3, 3 between the blocks 4, 5. rod 6, and a correction cylinder 7 which is fixed to the frame 2 and has the base end of the correction drive rod 6 connected to a piston rod, and is driven in the horizontal and vertical directions (not shown) to remove the parts. It is configured to be movable between a receiving position and a parts assembly position.

Further, the correction drive rod 6 has large diameter portions 6a, 6a formed at two locations in the middle thereof, separated by a predetermined distance (distance longer than the stroke of the correction cylinder 7), and both large diameter portions 6a, 6a. The part other than 6a becomes the small diameter part 6b, and the large diameter part 6a and the small diameter part 6b are formed alternately, and the difference in diameter between the large diameter part 6a and the small diameter part 6b is the set part spacing correction amount. It is adjusted to. Further, the boundary between the large diameter portion 6a and the small diameter portion 6b is formed into a tapered shape, and can be driven forward and backward in the axial direction by the correction cylinder 7.

On the other hand, the pair of blocks 4 and 5, which are provided with chuck devices 4a and 5a at their lower portions, are arranged at approximately the same height as the correction drive rod 6 at opposing surfaces on their upper sides through which the guide rods 3 and 3 are inserted. It has abutting portions 4b, 5b that protrude almost horizontally from the position in the direction of the correction drive rod 6, and both abutment portions 4b, 5b are diagonally opposed to each other with the correction drive rod 6 in between. The contact portions 4b and 5b are arranged at a distance equal to the distance between the large diameter portions 6a formed in the correction drive rod 6, and an abutment wheel is provided at each tip of both the contact portions 4b and 5b. 4c and 5c are rotatably attached.

Furthermore, both blocks 4 and 5 are brought close to each other by a coil spring (not shown) that is wound around the outer periphery of the guide rods 3 and 3 and compressed between each block 4 and 5 and the side wall of the frame body 2. Therefore, the contact wheels 4c, 5c of both blocks 4, 5 are always in rotatable contact with the outer peripheral surface of the correction drive rod 6.

The distance between both chuck devices 4a and 5a of this automatic assembly tool 1 is the distance between the parts set on the pallet by the operation of the correction drive rod ₆ , and the distance between the parts set on this pallet. The part spacing during actual assembly is set to _l2 , which is wider than _l1 .

Note that 8 is a valve which is a part to be assembled to the cylinder head of the engine using this automatic assembly tool, and 9 is a piston rod of the lifting cylinder.

Next, a case will be described in which the valve 8, which is an engine part, is assembled to the cylinder head using the automatic assembly tool configured as described above.

The automatic assembly tool 1 first uses chuck devices 4a and 5a to respectively chuck two valves 8 and 8 that are set at an interval of ₁ on a pallet (not shown) placed at a parts receiving position. grasp. At this time, the correction drive rod 6 is in the forward state, and the blocks 4 and 4 equipped with the chuck devices 4a and 5a are
Since the abutting wheels 4c, 5c of No. 5 abut against the outer peripheries of the small diameter portions 6b, 6b of the correction drive rod 6, respectively, the distance between the chuck devices 4a, 5a is narrow _l1
Since the dimensions are adjusted to , the two valves 8, 8 on the pallet can be gripped smoothly and reliably (see FIG. 2).

Next, the automatic assembly tool 1 holding both valves 8, 8 moves upward and horizontally to reach the assembly position above the cylinder head of the engine. During this movement, the correction drive rod 6 is driven backward by the correction cylinder 7, and the large diameter portions 6a, 6a move to the positions of the contact wheels 4c, 5c of the blocks 4, 5. Therefore,
The contact wheels 4c, 5c ride on the outer peripheral surfaces of the large diameter parts 6a, 6a from the small diameter parts 6b, 6b of the correction drive rod 6 through the tapered parts, and both the blocks 4, 5 are mounted on coil springs. move away from each other against the elastic force of As a result, the distance between the chuck devices 4a and 5a provided in both blocks 4 and 5 is increased, and the distance between the chuck devices 4a and 5a provided in both blocks 4 and 5 is increased, and the distance between the chuck devices 4a and 5a is adjusted accurately and reliably to the dimension _l2 , which is the distance between the guide holes formed in the cylinder head. (See Figure 3).

Then, the automatic assembly tool 1, which has adjusted the distance between the chuck devices 4a and 5a to _l2 , descends and guides the rods of the valves 8 and 8 held by the chuck devices 4a and 5a to the cylinder head. After inserting it into the hole and installing it in a predetermined position, the chuck devices 4a and 5a are released, and then the automatic assembly tool 1 rises, moves horizontally, returns to the parts receiving position, and starts the next operation. Wait until. Also, during the movement back to the standby position, the correction drive rod 6 is driven forward by the correction cylinder 7, and the small diameter portion of the correction drive rod 6 is moved to the position of the contact wheels 4c, 5c of both blocks 4, 5. continues to move,
Therefore, both blocks 4 and 5 are pushed by the elastic force of the coil spring, and the chuck devices 4a and 5 provided on both blocks 4 and 5 are moved closer to each other.
The spacing a is again adjusted to the l ₁ dimension.

Therefore, according to the automatic assembly tool of the above embodiment, the correction cylinder 7 drives the correction drive rod 6 to mechanically adjust the distance between the blocks 4 and 5 provided with the chuck devices 4a and 5a. This eliminates the need for a complicated position control mechanism.
In addition, the present invention has the advantage that the distance between parts can be corrected in a short time, and the device can be constructed with a simple structure and low cost.

In the automatic assembly tool 1 of the above embodiment, the correction drive rod 6 may be a correction drive rod with a large diameter portion 6a and a small diameter portion 6b having different diameters, or a correction drive rod with a diameter of a large diameter portion 6a and a small diameter portion 6b. By making it possible to replace the correction drive rod with a different difference, it is possible to handle assembly work with different parts spacing, and to increase versatility.

Effects of the invention As explained above, in this invention, at least one of the chuck devices can be moved together with the movable block by moving the drive rod back and forth. The spacing between parts can be corrected to the spacing at the time of assembly, and the pallet can be used more efficiently since it is no longer necessary to adjust the spacing between the parts set on the pallet to the spacing between the parts at the time of assembly.

In addition, since the part spacing is corrected while moving from the parts receiving position to the assembly position, there is no time loss such as waiting, and the cycle time can be shortened. This has the advantage of being highly versatile and easily adaptable to assembly work with different parts spacing.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of an assembly tool with a part spacing correction function of this invention, Fig. 2 is an explanatory view showing the state when parts are received, and Fig. 3 shows the state after part spacing correction. FIG. 1... Automatic assembly tool, 2... Frame, 3...
Guide rod, 4, 5...Block, 4a, 5a...
Chuck device, 4c, 5c... contact vehicle, 6... correction drive rod, 6a... large diameter section, 6b... small diameter section, 7... correction cylinder, 8... valve.

Claims (1)

[Scope of utility model registration request] a pair of movable blocks each integrally provided with a chuck device for individually gripping parts; a guide member for guiding at least one of the movable blocks in a direction toward and away from each other; and a guide member extending perpendicular to the moving direction of the movable blocks. a drive rod that is moved back and forth in the direction; a protrusion formed on the drive rod to correspond to the movable block and protrude outward in the radial direction; and an abutment provided on the movable block so as to be pressed against the drive rod. An assembly tool with a part spacing correction function, characterized in that it is equipped with means.