JPH1177450A - Assembly method for elastic ring and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically assemble an elastic ring of packing or the like in a bar-shaped workpiece of spool shaft or the like. SOLUTION: In a work pallet, a plurality of spool shafts S are received, and a packing P assembled in annular grooves Ga to Gd of this spool shaft S is received in a packing pallet. Mounting rods 25a to 25d having an insertion part inserting the packing P in a lower end part and formed with hold holes 27a to 27d receiving the spool shaft S in an upper end part are provided, and these mounting rods are fitted into a guide hole of a mounting unit. When the rod is moved to lower down, the packing P is moved to an upper end part of the mounting rod by a press finger 31, and the packing P is assembled in the annular groove of the spool shaft S.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for assembling an elastic ring for automatically inserting an elastic ring such as a packing or an O-ring into a valve shaft of a spool type switching valve.

[0002]

2. Description of the Related Art Directional control valves for controlling the flow direction of a fluid include a switching valve, a check valve and a shuttle valve, and the structure of a valve body includes a poppet valve and a spool valve. There are a manual operation method, an electromagnetic operation method, a pilot pressure operation method, and the like as an operation method for driving the.

[0003] Among such directional control valves, in the case of a spool valve type, an annular groove is formed in a spool shaft also called a valve shaft or a valve shaft, and packing or an O-ring is provided in the groove. Some types are inserted. Japanese Utility Model Laid-Open No. 4-80980 discloses a switching valve in which a pilot pressure is controlled by operating an electromagnetic valve to operate a spool type switching valve.

[0004]

Conventionally, when assembling a spool type directional switching valve such as a switching valve, an operator manually inserts a packing or an O into a groove of a spool shaft.
The ring is inserted.

However, when assembling the valve by manually inserting the packing, the productivity of the valve is poor, and the production of the valve requires a lot of manpower.

An object of the present invention is to provide a technique capable of automatically assembling an elastic ring such as a packing into an annular groove formed in a rod-shaped work such as a spool shaft.

[0007] The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0008]

SUMMARY OF THE INVENTION Among the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows.

That is, the method of assembling the elastic ring according to the present invention comprises the steps of: inserting the lower end of the mounting rod into the elastic ring accommodated in the ring pallet; The mounting rod having the elastic ring inserted therein is fitted into the guide hole of the mounting unit having a pressing finger for pressing the outer peripheral surface of the mounting rod fitted in the guide hole, and A step of moving an elastic ring from a lower end to an upper end of the mounting rod, a step of inserting a rod-shaped work into a holding hole formed at an upper end of the mounting rod, and the rod-shaped work being inserted into the holding hole. By lowering the mounting rod in the state, the elastic finger positioned at the upper end of the mounting rod is pressed by the pressing finger. The characterized in that a step for Possessed in an annular groove of the rod-shaped workpiece.

The apparatus for assembling an elastic ring according to the present invention is a work pallet for accommodating a plurality of bar-shaped works in a vertical state, and a ring for accommodating the elastic rings assembled in the annular groove of the bar-shaped work in a horizontal state. A pallet, a mounting rod having an insertion portion into which the elastic ring is inserted at a lower end portion and a holding hole formed at an upper end portion for accommodating the rod-shaped work, and a guide hole for vertically guiding the mounting rod, And a pressing finger that presses against the outer peripheral surface of the mounting rod fitted into the guide hole and moves the elastic ring inserted at the lower end to the upper portion thereof as the mounting rod moves downward. After the mounting unit and the mounting rod are inserted into the elastic ring in the ring pallet, they are fitted into the guide holes of the mounting unit. The elastic ring inserted at the lower end of the mounting rod is moved to the upper part of the mounting rod by the pressing finger, and the rod-like work in the work pallet is inserted into the holding hole formed at the upper end of the mounting rod. And a transfer robot for lowering the mounting rod and moving the elastic ring from the upper end of the mounting rod to the annular groove by the pressing finger.

According to the present invention, the mounting rod is reciprocated by the transfer robot between the pallet containing the elastic ring and the mounting unit, and is transferred into the receiving hole formed at the upper end of the mounting rod by the transfer robot. By inserting the rod-shaped member, the elastic ring can be assembled in the annular groove formed in the rod-shaped member. Thus, the elastic ring can be automatically assembled without the operator.

[0012]

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

FIG. 1 is a front view showing an entire packing assembling apparatus according to an embodiment of the present invention, and FIG.
2 is a sectional view taken along line 2-2 in FIG. FIG. 3 is a diagram showing an example of a spool shaft S also called a valve shaft or a valve shaft as a rod-shaped work.
In each of the four annular grooves G formed in the spool shaft S, a packing P as an elastic ring is assembled.

As shown in FIG. 1, in the packing assembling apparatus, a guide rail 12 is laid on a base 10 via a support base 11 so as to be movable in a direction perpendicular to the paper surface. The transport head 13 is mounted so as to be movable in the horizontal direction along the axis, and the transport head 13 is movable in the XY directions. A hand 14 for gripping a spool shaft S and a mounting rod to be described later is vertically movably mounted on the transfer head 13, and this hand 14 constitutes a transfer robot for transferring the rod-shaped work and the transfer rod. I have.

On the upper surface of the base 10, a work pallet 15 for storing a large number of the spool shafts S shown in FIG. 3 as a work and a ring for storing a large number of packings P shown in FIG. A packing pallet 16 as a pallet is arranged. Mounting units 17 for assembling packings P four by four with respect to the spool shaft S taken out from the work pallet 15 are arranged on the base 10 adjacent to the respective pallets 15 and 16.

The mounting unit 17 is shown in an enlarged manner.
This is as shown in FIGS. FIG. 4 shows the mounting unit 17.
FIG. 5 is a partially cutaway front view of FIG.
FIG. 6 is a partially cutaway plan view along line 5 and FIG. 6 is a side view along line 6-6 in FIG.

The mounting unit 17 has a bottom plate 20 fixed to the base 10 and a top plate 21 above the bottom plate 20, and these are connected by a plurality of columns 22. The top plate 21 has four sleeves 23a to 2
3d, each sleeve 23a
Mounting rods 25a to 25d
Are detachably fitted.

The four mounting rods 25a to 25d are shown in FIG.
As shown in (A), the lower end has a tapered insertion portion 26a formed to be smaller than the inner diameter of the packing P, and the upper side thereof becomes a straight portion 26b.
6b is connected to a straight large-diameter upper end portion 26d via a tapered portion 26c whose outer diameter increases as going upward.

At the upper end of each of the mounting rods 25a to 25d, there are formed holding holes 27a to 27d for accommodating the rod-shaped work, that is, the spool shaft S in a vertical state. The depth of each of the holding holes 27a to 27d is Are formed differently corresponding to the positions of the four annular grooves G formed in the spool shaft S. That is, as shown in FIG. 8, the depth of the holding hole 27a of the mounting rod 25a is set at the position of the uppermost annular groove Ga of the spool shaft S in the vertical state.
a corresponding to the upper end face of the mounting rod 25b.
Mounting rod 25b at the position of the second annular groove Gb from the top
Has a depth Db corresponding to the upper end face of. Similarly, the holding holes 27c, 2 of the other mounting rods 25c, 25d.
The depth of 7d is Dc and Dd, respectively.

As shown in FIGS. 4 and 5, a linear guide member 30 is fixed to the top plate 21.
Has a mounting rod 25a fitted in the sleeve 23a.
So that the two pressing fingers 3
1 is arranged. Each pressing finger 31 has a V-shaped notch 3 in contact with the mounting rod 25a.
2 are formed. In order to urge a spring force toward the mounting rod 25a against the pressing finger 31, the top plate 2
1, a compression coil spring 3
4 is provided with a pressing pin 35 to which is attached. In addition,
A cover 36 is attached to the upper surface of the bracket 33. As shown in FIG. 5, the cover 36 has an outer diameter of the packing P fitted to the upper ends of the mounting rods 25a to 25d. Also, a through hole 36a having a large inner diameter is formed.

When the mounting rod 25a is taken out of the sleeve 23a, the pressing finger 31 moves to the compression coil spring 3a.
Due to the spring force of No. 4, they move close to each other while maintaining a parallel state. Under this condition, the mounting rod 25a
Is fitted into the sleeve 23a, the pressing finger 3
1 will be pushed and spread, and will keep maintaining the state which contacted the outer surface of the mounting rod 25a with predetermined pressure. For the other mounting rods 25b to 25d, pressing fingers (not shown)
~ 25d.

As shown in FIGS. 4 and 6, a vertical bracket 37 is mounted on the bottom plate 20, and the vertical bracket 37 has four mounting rods 25a to 25a-2.
Four guide rails 38 are fixed corresponding to 5d. As shown in FIG. 6, a support member 40 having a vertical portion 40a and a horizontal portion 40b and having an L-shaped cross section is attached to each guide rail 38 so as to be vertically slidable. The support members 40 penetrate the guide bolts 41 fixed to the bottom plate 20 at the respective horizontal portions 40b, and are directed upward to the support members 40 by the compression coil springs 42 attached to the respective guide bolts 41. A spring force is applied. Each support member 4
The zero ascending limit position is regulated by the head of the guide bolt 41.

A receiving piece 43 is provided at the horizontal portion 40b of each support member 40 with which the distal ends of the mounting rods 25a to 25d abut, and when the mounting rods 25a to 25d are pressed downward, the support members 40 are respectively displaced. , And moves downward against the spring force of the compression coil spring 42. Bottom plate 2
A stopper bolt 45 that contacts the stopper 44 fixed to 0 is screwed to the horizontal portion 40b. The lower limit position is adjusted by rotating each stopper bolt 45, and each stopper bolt 45 can be fixed by the fastening nut 46.

Next, a procedure for assembling the four packings P to the spool shaft S using the above-described packing assembling apparatus will be described.

First, the mounting rod 25a is gripped by the hand 14 as a transfer robot and transported to a position above the packing pallet 16 shown in FIGS.
a is moved downward. FIG. 7A shows the mounting rod 25a.
Shows a state in which the packing P has been inserted into the insertion portion 26a at the distal end thereof. After the insertion process is completed in this way, the mounting rod 25a is raised and then horizontally moved to mount the mounting unit 1 as shown in FIG. 7 (B1).
7 to just above the sleeve 23a.

When the mounting rod 25a is moved downward in this state, as shown in FIG. 7 (B1), the packing P hits the pressing finger 31 and is pushed up to the upper end side with respect to the mounting rod 25a. When the mounting rod 25a is pushed down to the lower limit position, the packing P is attached to the mounting rod 25a.
It will move to the upper end of a.

The operation is performed by using other mounting rods 25b to 25d.
When this is also performed, as shown in FIG. 8, the packing P is inserted into each of the upper ends of the four mounting rods 25a to 25d. However, each mounting rod 2
The transport between the packing pallet 16 and the mounting unit 17 with respect to 5a to 25d may be performed with any mounting rod first, and the order may be arbitrary.

Next, the hand 14 is moved to the work pallet 15
, The hand 14 is moved down just above a predetermined spool shaft S, the spool shaft S is gripped and raised, and then horizontally conveyed to just above the mounting rod 25a. In this state, the hand 14 is moved downward to push the spool shaft S into the holding hole 27a of the mounting rod 25a. FIG. 8 shows a state in which the spool shaft S is in contact with the bottom surface of the holding hole 27a of the mounting rod 25a. Subsequently, when the mounting rod 25a is moved downward by the hand 14 via the spool shaft S, the packing P Is pushed up relative to the mounting rod 25a. When the mounting rod 25a moves down to the lowermost position, the packing P is attached to the mounting rod 25a.
The packing P is relatively pushed up to the position of the upper end surface of a, whereby the packing P moves from the upper end of the mounting rod 25a to the annular groove Ga.

When the packing P has been assembled to the annular groove Ga in this manner, the hand 14 is moved up to take out the spool shaft S from the holding hole 27a.
Subsequently, the holding hole 27 of the second mounting rod 25b is
Insert the spool P into the annular groove Gb and insert the spool P into the annular groove Gb by performing the same operation as described above.

As shown by the arrow in FIG.
4, the spool shaft S is connected to the four mounting rods 25a to 25a.
The packing P is attached to all of the four annular grooves by being inserted into and removed from the holding holes 27a to 27d of "d". After the assembly is completed, the spool shaft S
By 4, it is transported to a product take-out section (not shown).

The operation described above is continuously performed for all the spool shafts S accommodated in the work pallet 15.

The transport of the mounting rods and the transport of the spool shaft S may be performed by separate transporting means. However, all the mounting rods can be moved to the packing pallet 16 by one hand 14 that moves vertically and horizontally. And mounting unit 17
, The spool shaft S is transported from the work pallet 15 to the first mounting rod, and further transported to the first to fourth mounting rods. Packing P more efficiently
Can be assembled.

Although the invention made by the inventor has been specifically described based on the embodiment, the invention is not limited to the above-described embodiment, and can be variously modified without departing from the gist of the invention. Needless to say, there is.

For example, in the case of the drawing, the case where four packings P are assembled to one spool shaft S has been described, but an arbitrary number of packings may be attached to the spool shaft S.
Can be assembled. The member to which the packing is assembled is not limited to the shape shown in the figure, and may be any rod-shaped work as long as a groove is formed on the outer peripheral surface. The member to be assembled into the annular groove of the rod-shaped work may be any member other than the packing described above, as long as it is made of an elastic material and has a ring shape, such as an O-ring.

[0035]

Advantageous effects obtained by typical ones of the inventions disclosed in the present application will be briefly described.
It is as follows.

(1) The elastic ring can be automatically assembled to a rod-shaped work such as a spool shaft without manual operation.

(2) Since the packing can be automatically assembled to the spool shaft, the assembling efficiency of the directional control valve having the spool shaft can be improved.

[Brief description of the drawings]

FIG. 1 is a front view showing an entire packing assembling apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line 2-2 in FIG.

FIG. 3 is a front view showing an example of a spool shaft which is a bar-shaped work.

FIG. 4 is an enlarged front view, partially cutaway, showing the mounting unit shown in FIG. 1;

FIG. 5 is a plan view along the line 5-5 in FIG. 4;

FIG. 6 is a side view taken along line 6-6 in FIG.

FIG. 7A is a cross-sectional view showing a state in which packing is inserted into a lower end portion of a mounting rod, and FIGS. 7B to 7B show a state in which the packing inserted into the lower end portion is moved to the upper end portion of the mounting rod. It is a front view which shows the process of making it.

FIG. 8 is a partially cutaway front view showing a procedure of sequentially pushing a spool shaft into holding holes of a plurality of mounting rods and assembling a packing into a plurality of annular grooves.

[Explanation of symbols]

 Reference Signs List 10 base 11 support 12 guide rail 13 transfer head 14 hand 15 work pallet 16 packing pallet 17 mounting unit 23a to 23d sleeve 24 guide hole 25a to 25d mounting rod 27a to 27d holding hole 30 linear guide member 31 pressing finger 32 notch Part 34 Compression coil spring 35 Press pin 40 Support member 41 Guide bolt 42 Compression coil spring 44 Stopper 45 Stopper bolt 46 Fastening nut

Claims (4)

[Claims] 1. A method for assembling an elastic ring in which an elastic ring is assembled in an annular groove formed in a rod-shaped work, wherein a lower end of a mounting rod is inserted into the elastic ring housed in a ring pallet. And a guide hole for guiding the mounting rod so that the mounting rod can move up and down, and a pressing finger that presses against the outer peripheral surface of the mounting rod fitted in the guide hole. Fitting the mounting rod into which the ring has been inserted, and moving the elastic ring from the lower end to the upper end of the mounting rod by the pressing finger; and a rod-like hole formed in a holding hole formed in the upper end of the mounting rod. The step of inserting a work, and the pressing operation is performed by moving the mounting rod downward while the rod-shaped work is inserted into the holding hole. The method of assembling the elastic ring, characterized in that it comprises a step of Possessed the elastic ring in the annular groove of the rod-shaped workpiece located in the upper end of the mounting rod by Inga. 2. The method of assembling an elastic ring according to claim 1, wherein said mounting rods have a number corresponding to the number of annular grooves formed in said rod-shaped workpiece, and said mounting rod is provided at an upper end portion of each of said mounting rods. Holding holes having different depths are formed according to the positions of the annular grooves, the mounting unit has guide holes corresponding to the number of the mounting rods, and the elastic ring is provided at a lower end of each of the mounting rods. After inserting, it is shifted in the mounting unit,
Under the state in which the elastic rings are shifted to the upper end portions of all the mounting rods, the insertion of the rod-shaped work into the holding hole of the mounting rod and the downward movement of the inserted mounting rod, A method for assembling an elastic ring, wherein the method is sequentially performed on each of the mounting rods, and the elastic ring is sequentially assembled into a plurality of annular grooves of one rod-shaped work. 3. An apparatus for assembling an elastic ring for attaching an elastic ring to an annular groove formed in a rod-shaped work, the work pallet accommodating a plurality of the rod-shaped works in a vertical state, and the rod-shaped work pallet. A ring pallet for accommodating the elastic rings assembled in the annular groove of the work in a horizontal state, and a holding hole for accommodating the rod-shaped work at an upper end having an insertion portion into which the elastic ring is inserted at a lower end. A mounting hole, a guide hole for vertically guiding the mounting rod, and the elastic ring inserted into the lower end by pressing against the outer peripheral surface of the mounting rod fitted in the guide hole. A mounting unit having a pressing finger for moving the mounting rod to a position above the mounting pallet as the mounting rod moves downward; After being inserted into the elastic ring, the fitting ring is fitted into the guide hole of the mounting unit, and the elastic ring inserted at the lower end of the mounting rod is moved to the upper part of the mounting rod by the pressing finger, The rod-shaped work in the work pallet is inserted into the holding hole formed at the upper end of the mounting rod, and the mounting rod is moved downward to move the elastic ring from the upper end of the mounting rod to the annular groove. An apparatus for assembling an elastic ring, comprising: a transfer robot that can be transferred by a pressing finger. 4. The apparatus for assembling an elastic ring according to claim 3, wherein said mounting rod has a number corresponding to the number of annular grooves formed in said rod-shaped work, and is provided at an upper end of each mounting rod. The holding holes having different depths are formed in accordance with the positions of the annular grooves, and the rod-shaped work is sequentially moved to the holding holes of the plurality of mounting rods, thereby forming the plurality of annular grooves of the rod-shaped work. An elastic ring assembling device, wherein an elastic ring is attached to each of the elastic rings.