JPS6133655B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic assembly machine for cylindrical parts having a key grooved hole that fits into a shaft-mounted key.

Conventionally, automatic assembly in which a part with a round hole is press-fitted into a round shaft using a key, such as assembling a key-grooved shaft joint to the key-grooved shaft end of a pump via a key, can be done with a round shaft even if there is no key. Since the round holes are press-fitted, it is difficult to fit them together by automatic assembly, and furthermore, it is difficult to press-fit them. In order to fit the round shaft and the round hole through the key by automatic assembly, it is necessary to automatically assemble the key to the round shaft, and this technical problem has not been solved in the past. It is extremely difficult to insert a round hole into the shaft, and in such cases, it is recommended to make the shaft end cross-sectional shape into a square shaft without using a key, a spline shaft, a distorted circle of equal width, etc., and insert the mating part into a hole of the same shape. It is usual to plan for

However, the inventor of the present invention has invented an automatic assembly method from attaching the key to attaching the shaft coupling to the end of the pump shaft, and the invention consists of three steps: intermediate attachment of the key to the shaft; This consists of intermediate installation of the shaft coupling to the keyed shaft, and complete installation of the key and shaft coupling to the shaft.

An object of the present invention is to invent a method for attaching a shaft coupling to a pump shaft via the key, and to provide a pump shaft with a key to which a key is attached intermediately before the shaft coupling is completely press-fitted into the pump shaft. It is an object of the present invention to provide an automatic assembly machine for a shaft joint that attaches the shaft joint to the end.

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 are side views of examples of workpieces handled by the automatic assembly machine according to the present invention.

The casing cover assembly assembled to the pump casing is generally designated by the reference numeral 1. A bearing bracket 4 is fixed to the casing cover 2 by bolts 3, and the bearing bracket 4 is inserted through the shaft sealing device in the casing cover 2 (not shown in the figure).
A rectangular key 7 is inserted into the keyway 6 at the end of the pump shaft 5 of the casing cover assembly 1, in which the pump shaft 5 mounted on the inner bearing is rotatably assembled. The casing cover assembly (hereinafter referred to as "casing cover assembly"), which is press-fitted with the key 7 pushed out and intermediately assembled, is assembled up to the pre-process of the automatic shaft coupling assembly machine of the present invention. This is an automatic assembly in which a part of the key 7 is press-fitted into a key groove 6 as shown in FIG. The automatic shaft joint assembly machine of the present invention has a keyway 9 in the hole, and the keyway 9 fits into the key 7 and the keyway 9
This machine is responsible for automatically performing an intermediate assembly process in which the hole of the shaft coupling 8 equipped with the shaft is partially press-fitted into the pump shaft 5, and the next machine after the shaft coupling automatic assembly machine of the present invention is in the state shown in FIG. This machine is a normal hydraulic press, and is a machine that completely press-fits the assembled workpiece 1 into the shaft end of the pump shaft 5 by completely press-fitting the shaft joint 8 into the shaft end of the pump shaft 5 as shown in FIG.

FIG. 4 is a plan view of the automatic shaft joint assembly machine. In FIG. 4, a pallet-type jig table 12 is transported between the respective processes by a free flow chain (not visible in the figure) in the direction of the arrow shown in the reference frame 11 which is located on the left and right. It is adapted to be positioned and fixed in position.

The workpiece 1 is conveyed to the jig table 12 in the form shown in FIG. 1 while being fixed in contact with the flange portion of the casing cover 2 of the workpiece 1. Reference frame 11
A device for supplying the shaft coupling 8 to the workpiece 1 is provided on the side of the workpiece 1, and the supplied shaft coupling 8 is placed on the setting table 1 on the opposite side of the reference frame 11.
It is held between a base 17 of a V-block fixed to the piston rod end of a hydraulic cylinder 16 fixed parallel to the reference frame 11 on 9 and a base 18 fixed to a set table 19 opposite to the base 17. I'm starting to wait.

Vertical frames 21 and 22 are erected in front of the reference frame 11 on the floor and on the opposite side of the setting table.
arranged horizontally and parallelly orthogonally to the reference frame 11,
Guide bar 2 fixed to the top of vertical frames 21 and 22
4, a main head 25 included in the shaft coupling assembly head 23;
is slid into the main head 25, and the piston rod end of a hydraulically operated shift cylinder 26, which is fixed to the vertical frame 21 parallel to the guide cover 24, is fixed to the main head 25. It is possible to move between the setting table 19 and the workpiece 1 fixed at the center of the jig table 12.

FIG. 5 is a longitudinal sectional view parallel to the front of the automatic assembly device, and FIG. 6 is a side view of FIG. 5. The figure is shown rotated 90 degrees with the top to the right.

One end of the guide bar 24 is directly fixed to the vertical frame 21, and the other end is fitted into a bracket 27 that is fitted and fixed to the vertical frame 22. The main head 25 is brought into contact with the bracket 27, and the main head 25 is positioned. It is becoming more and more like this.

The main head 25 has a hydraulically operated upper and lower cylinder 2.
8 is fixed, and an adapter 29 is fitted into the hanging piston rod end of the cylinder 28 and fixed by a nut 31 screwed into the piston rod end.

A pin 32 is driven into the adapter 29,
The adapter 29 is a cylindrical upper frame 33 with openings on both sides.
The upper frame 33 is fitted into the lower cylindrical shaft of the adapter 29 and is prevented from rotating by the pin 32, and the lock nut 35 is screwed into the thread at the end of the cylindrical shaft of the adapter 29 via the lock washer 34, and the adapter 29 and the upper frame 33 are fastened together. . Although not shown, the upper frame 33 is guided by, for example, a vertical guide bar so as not to rotate. This upper frame 33 is a support frame that supports the main head 25, upper and lower cylinders 8, and other parts of the assembly head other than those mentioned above. A press-fit cylinder 37 operated by fluid pressure is fixed to the lower end plate of the upper frame 33 by a bolt 36. The outer peripheral side of the lower end plate of the upper frame 33 is a flange, and a holder 38 that supports a model shaft and its rotation device (described later) is fitted and fixed in the lower end spigot of the upper frame 33.

As shown in FIG. 6, the upper frame 33 and the holder 38
There is a notch 39 in the flange part of the mating part.
The arm 41 fits into this part, and semicircular grooves are provided on the contact surfaces of the upper frame 33 and the holder 38 on both sides of the notch, and the arm 41 is inserted into the pin 42 that is fixed by fitting into both grooves. It is pivoted.

FIG. 7 is a rear view of FIG. 5. A bracket 43 is integrally formed at the bottom of the upper frame 33, one end of a wire 45 is tied to a movable piece of a solenoid 44 fixed on the bracket 43, and the other end of the wire 45 is connected to a stand erected on the bracket 43. It is connected to one end of a lever 48 which is pivotally connected to 46 by a pin 47. A wire 49 is connected to both ends of the lever 48.
are connected to each other, and the other end of the wire 49 is connected to the arm 41.
joined at the ends. As shown in FIG. 5, the arm 41 has a pair of buckets 51 fixed to its lower end that hold the shaft joint 8, and when the wire 49 is loosened, the arm 4 is moved so that the buckets 51 come closer to each other.
1 is selected, and the arm 41 is further equipped with a shaft coupling 8.
Weights 52 and 53 are fixed so as to grip the shaft joint 8 and apply appropriate pressure to the shaft joint 8 so as to be movable in the axial direction.

The piston rod of the press-fit cylinder 37 is attached to the holder 3.
A press-fitting tool 55 protrudes into the piston rod end and has a pressure ring 54 fitted and fixed at its lower part, and is fixed by a nut 56 screwed into the thread at the piston rod end.

As shown in FIG. 8, which is a cross-sectional view taken along line A-A in FIG. Atsute pillar 57
is inserted through the lower end plate of the cylindrical holder 38 and guided in the vertical direction.

As shown in FIG. 5, a bearing bushing 58 is fitted and fixed into the circular hole at the center of the lower end plate of the holder 38, and the thrust bearing 59 fitted into the bearing bushing 58 is fitted into the rotating shaft 61 which is slid into the bearing bushing 58. It comes into contact with a gear 63 fixed by a bolt 62 and carries thrust. A shaft 65 is driven into a bracket 64 fixed to the holder 38, a gear 66 that meshes with the gear 63 is rotatably fitted into the shaft 65, and a worm is fixed to the shaft end of an electric motor 67 fixed to the bracket 64. 68 meshes with the gear 66. Therefore, when the electric motor 67 is energized, the worm 6
The rotation of 8 is decelerated and transmitted to the gear 66,
rotates the gear 63, and the rotating shaft 61 is rotated.

A model shaft 69 is screwed and fixed to the end of the rotating shaft 61. The model shaft 69 is inserted through the press-fit ring 54. The model shaft 69 has a protrusion 7 on its end face with a guide taper that fits into the center hole for machining the pump shaft 5.
The shaft end 71 with 0 at the center is circular with a radius slightly smaller than the distance from the bottom of the keyway 6 of the pump shaft 5 to the center of the pump shaft 5, and the length of the shaft end 71 is as shown in FIG. This is larger than the protrusion length h of the key 7 assembled in the previous step shown in FIG.
The shaft portion 72 following the shaft end 71 of the model shaft 69 is the shaft joint 8
The tip end surface that slides into the keyway of the shaft coupling 8 is left in the cylindrical cross section, but the three sides of the tip are sloped 74.
This is a fixed key 73 with .

Before the jig table 12 transports the workpiece 1 and sets it at the position of the shaft coupling assembly machine, the supply device for the shaft coupling 8 is placed on the setting table 19 and the nozzle 17 is moved while the shaft coupling 8 is being assembled onto the pump shaft 5. , 18 at shaft coupling 8
I'm holding on and waiting. Shaft coupling 8 to pump shaft 5
When the assembly is completed, the bucket 51 is opened and the upper frame 33 and holder 38 are raised by the upper and lower cylinders 28, the part carried by the holder 38 is raised, the model shaft 69 is also raised, and the press-fit cylinder 37 is raised. The press fitting tool 55 is in the raised position. In this state, the workpiece 1 of the assembly agent having the shape shown in FIG. 2 is carried on the jig table 12 and sent, and the workpiece having the shape shown in FIG. 1 is fixed to the jig table 12 from the previous process. It is then positioned and fixed under the shaft coupling assembly machine.

On the other hand, the shaft coupling assembly head 23 rises as described above, and the pressure ring 54 and model shaft 69 rise, and then the shift cylinder 26 retreats and moves the shaft coupling assembly head 23 from the center position of the workpiece 1 onto the setting table 19. let Subsequently, the electric motor 67 is energized, the rotating shaft 61 rotates, and the model shaft 69 rotates at a low speed. Next, the upper and lower cylinders 28 are energized downward, and the model shaft 69 rotates at low speed, descends, and enters the hole in the shaft coupling 8. Since the model shaft 69 is rotating, the key 73 of the model shaft is inserted into the shaft coupling 8. Matches no matter where the key position is. At this time, the shaft end of the model shaft 69 is irrelevant, and the next shaft portion 72 enters the hole of the shaft joint 8. At this time, the entrance of the hole of the shaft joint 8 and the shaft end of the model shaft
As long as the key 73 of the model shaft is not aligned with the keyway of the shaft coupling 8 at the end of the shaft, the rotating shaft 61 will move upward in the bearing bush 58 even if the holder 38 is lowered, and the gear 63 will move upward in the bearing bush 58. Since the model shaft 69 rotates, the shaft portion 72 and key 73 of the model shaft 69 fit into the key grooved hole of the shaft coupling 8. At this time, the key 73 of the model axis is set to slope 7.
4, it can easily fit into the keyway 9 of the shaft coupling 8. When the holder 38 stops and a switch (not shown) confirms that the model shaft 69 has been fitted into the hole of the shaft joint 8, the solenoid 44 is deenergized and the movable piece of the solenoid 44 moves to the left in FIG.
The lever 48 rotates around the pin 47 so that the buckets 51 approach each other, so the upper ends of the arms 41 move away from each other, and the wire 49 pulls the lever 48, causing the lever 48 to rotate counterclockwise in FIG. 7th
The state shown in the figure will be reached. When the bucket 51 approaches, it is caught between the caps 17 and 18 on the setting table. The flange of the shaft joint 8 is clamped, and when the bucket 51 hits the outer diameter of the flange of the shaft joint 8, it stops.
Incidentally, since the bucket 51 moves by its own weight, it can freely grasp shaft joints of various sizes.

When the bucket 51 grips the shaft coupling 8, the workpiece setting cylinder 16 is urged to the right in FIG. 4, and the mouthpiece 17 moves to the right. Subsequently, the upper and lower cylinders 28 are energized in the upward direction, and the upper frame 33 and holder 3
8 rises, and the arm 41 also rises. At this time, the bucket 51 has a U-shape as seen from the front in FIG. Since the shaft joint 8 is only held by the bucket 51 which is trying to close due to its own weight, the outer periphery of the flange of the shaft joint 8 slides between the bottom of the bucket 51 and hits the lower piece 50 of the bucket 51, and the shaft joint 8 is supported. Ru. Since the electric motor 67 is not deenergized, the model shaft 69 continues to rotate around the shaft coupling 8 gripped by the bucket 51. Shaft coupling 8
When the upper and lower cylinders 28 are thus lifted and the rising end of the upper and lower cylinders 28 is confirmed by a switch (not shown), the shift cylinder 26 is energized, the main head 25 slides on the guide bar 24, the main head 25 hits the bracket 27, and is positioned. The shaft joint 8 is located directly above the workpiece 1 fixed to the jig table 12. Subsequently, the upper and lower cylinders 28 are energized downward, the entire shaft coupling assembly head 23 slowly descends, and the shaft coupling 8 approaches the pump shaft 5 on which the key 7 is set. As described above, the model shaft 69 and the shaft coupling 8 continue to rotate at low speed.

When the shaft coupling 8 contacts the key 7 built into the pump shaft 5, the shaft coupling 8 stops descending at that position, the model shaft 69 continues to descend, and the protrusion 70 with the guide taper touches the shaft end of the pump shaft 5. Stop descending when it meets the hole. At this time, the shaft joint 8 rotates at a low speed together with the model shaft 69, and the key 7 is rotated with the model shaft 69 as a guide.
It is located on top of the bag and is raised above the lower piece 50 of the bucket 51.

When the key 7 of the pump shaft looks into the keyway of the shaft coupling 8, the key 7 of the pump shaft is pushed into the shaft coupling 8 by the weight of the shaft coupling 8.
The pump shaft 5 is rotated together with the rotation of the model shaft 69. Next, the shaft coupling assembly head 23
When the holder 38 descends, the gear 66
is lowered, and the bearing bush 58 and thrust bearing 59 are also lowered. On the other hand, since the model shaft 69 cannot be lowered, the gear 63 cannot move in the axial direction, and the gear 66 moves in the direction of the teeth of the gear 63 and is disengaged, causing the model shaft 69, the shaft coupling 8, and the pump shaft 5 stops rotating. Thereafter, the electric motor 67 and the gears 63, 66 are disengaged, and at the same time, the electric motor 67 is deenergized and stopped. That is, the gears 63 and 66 stop immediately so that they can mesh again. Therefore, the electric motor 67 may be stopped while the gears 63 and 66 are being displaced in the tooth trace direction.

Next, the press-fit cylinder 37 is activated, the press-fit tool 55 is lowered, and the press-fit ring 54 pushes the shaft coupling 8 and the key 7.
Apply pressure to the shaft coupling 8 to the extent that it lightly grips the pump shaft 5 through the shaft. At this time, the lower end of the pump shaft 5 is opposed and pushed up by a jack cylinder mounted on a reference frame 11 (not shown).

When the assembly is completed, the solenoid 44 is energized, and the buckets 51 are moved away from each other and away from the shaft coupling 8. The upper and lower cylinders 28 are energized upward, and the upper frame 3
3. The holder 38 rises, the gear 66 moves in the tooth trace direction and engages with the gear 63, and the gear 66 comes into contact with the thrust bearing 59, so the model shaft 69 is pulled up and removed from the shaft joint 8. Subsequently, the press-fitting cylinder 37 is urged upward to raise the press-fitting tool 55. When the shaft coupling assembly head 23 rises, the jig table 12 carries the work 1 with the shaft coupling 8 assembled and is sent to the next process, and the work 1 without the shaft coupling 8 installed from the previous process is moved to the jig table. 12 and sent. On the other hand, the shaft coupling assembly head 23 is moved by the shift cylinder 26 above the shaft coupling 8 waiting on the set table 19, and the upper and lower cylinders 28
The shaft joint 8 is lowered to grasp the shaft joint 8.

In the present invention, the shaft joint assembly head supports a model shaft at the ends of the piston rods of the upper and lower cylinders so that it can freely move upwardly and rotationally drive a support body consisting of an upper frame and a holder. The upper part of the arm, which has a bucket at the tip that grips the joint, is pivoted so that the arm, bucket, etc. approach each other due to their own weight, and when the bucket opens, the arm is driven, so the shaft to be supplied is The joint rotates in the standby position on the supply side, the model shaft comes down, the rotating shaft moves with the model shaft, and the weight of the gear fixed to the rotating shaft causes the key provided on the model shaft to pick up the keyway of the coupling. It goes in smoothly so it doesn't break. The key of the model shaft has a slope on the lower end side surface, so it is easy to enter. Since the bucket grips the shaft joint with its own weight, it is possible to grasp workpieces with different outer diameters of the shaft joint flange.

When inserting the shaft joint into the pump shaft, a taper guide protrusion is provided at the end of the model shaft, so the center is determined and the center is determined with the pump shaft. In this case, since the head is supported by the upper and lower cylinders in the shaft joint assembly, the inclination of the model shaft is extremely small and can be ignored.
Since the lower member is provided on the bucket to movably hold the shaft coupling as described above, when the boss side end face of the shaft coupling comes into contact with the key end of the pump shaft, the bucket can be lowered leaving the shaft coupling in a rotating state. When the keyway of the shaft coupling matches the key of the pump shaft, the key of the pump shaft can enter the keyway of the shaft coupling.

In addition to the cylinder that moves the shaft coupling assembly head up and down, a press-fitting cylinder is provided on the support body fixed to the upper and lower cylinders of the shaft coupling assembly head, and a press-fitting cylinder is provided to move the press-fitting tool up and down, so that it is driven by a rotary drive device and moves upward. After positioning with a movable model axis,
The press fitting cylinder drives the press fitting tool to press fit the shaft coupling onto the pump shaft.

As described above, according to the present invention, automatic assembly allows the center of the shaft coupling to be positioned close to the pump shaft, the key on the pump shaft and the keyway of the shaft coupling to be aligned, and the key to be partially press-fitted during intermediate assembly. The shaft joint can be partially fitted onto the pump shaft by press-fitting the shaft joint in the axial direction onto the pump shaft.

[Brief explanation of the drawing]

1 to 3 are side views of the workpiece, FIG. 4 is a plan view of an embodiment of the present invention, FIG. 5 is a vertical cross-sectional view parallel to the front of the shaft coupling assembly head, and FIG. 5 is a side view, FIG. 7 is a rear view of FIG. 5, and FIG. 8 is a cross-sectional view taken along line AA of FIG. 5. DESCRIPTION OF SYMBOLS 1... Casing cover assembly, 2... Casing cover, 3... Bolt, 4... Bearing bracket, 5... Pump shaft, 6... Keyway, 7...
Key, 8...Shaft coupling, 9...Keyway, 11...Reference frame, 12...Jig table, 13...Upper fixing plate, 23...Shaft coupling assembly head, 25...Main head, 28... ...Upper and bottom cylinder, 29...Adapter, 31...Nut, 32...Pin, 33...Upper frame, 34...Lock nut, 35...Lock nut, 36...Bolt, 37...Press-fit cylinder, 38...Holder , 39...notch, 41...
Arm, 42...Pin, 43...Bracket, 4
4...Solenoid, 45...Wire, 46...Stand, 47...Pin, 48...Lever, 49...
...Wire, 50...Lower piece, 51...Bucket,
54...Press-fitting ring, 55...Press-fitting tool, 56...
Nut, 57... Support, 58... Bearing bush,
59... Thrust bearing, 61... Rotating shaft, 62... Bolt, 63... Gear, 64... Bracket, 65
...Shaft, 66...Gear, 67...Electric motor, 68...
...Worm, 69...Model axis, 70...Protrusion, 7
1...Shaft end, 72...Shaft portion, 73...Key, 74
……Slope.

Claims (1)

[Scope of Claims] 1. An assembly machine for fitting a mounting member to a keyed shaft, which is fitted into the keyway of a shaft provided with a keyway at the shaft end, with the key shifted from the shaft end to the outside in the axial direction, It has a support frame that is driven forward and backward in the axial direction opposite to the shaft end of the keyed shaft, and the mounting member A bucket is disposed on the outer periphery of the keyed shaft, and the bucket can be attached and removed by moving forward and backward from the periphery in the crosswise direction toward the center, and the arm to which the bucket is attached is pivotally attached to the support frame, and the arm driving device is connected to the keyed shaft. It is provided on the support frame, and is located on the same axis as the keyed shaft at the center of the end of the support frame opposite to the keyed shaft, and can freely move forward and backward with respect to the keyed shaft, and its movement is restricted in the direction of movement approaching the keyed shaft. A model shaft having the same cross section as the keyed shaft provided with the restraining member is rotatably fitted, and a rotation drive device for the model shaft is provided in the support frame, and a mounting member is mounted in the center of the support frame toward the keyed shaft. A press-fitting tool equipped with a ring that presses forward and retreats in the axial direction is guided and mounted on the support frame, and a drive device that moves the press-fitting tool forward and backward toward the mounting member is provided on the support frame, and the model shaft is mounted. The bucket is inserted into the member, the bucket grips the mounting member, the support frame advances toward the keyed shaft, detects that the mounting member has come into contact with the key end attached to the keyed shaft, opens the bucket, and the model A member for attaching to a keyed shaft that is equipped with a control device that rotates the rotational drive device of the shaft, and when the keyway of the model shaft fits into the key attached to the key shaft, the rotation of the model shaft is stopped and the press-fit ring is lowered. Insertion assembly machine. 2 The shaft end of the model shaft has a diameter that has a radius to the bottom of the keyway of the keyed shaft, and a length that is slightly longer than the part of the key that protrudes in the axial direction from the shaft end of the shaft to which the fitting mounting member is attached. 2. An assembly machine for fitting a mounting member onto a keyed shaft as claimed in claim 1, wherein the model shaft has a cylindrical portion and is provided with an alignment protrusion at the center of the end face of the model shaft to fit into the center hole of the keyed shaft. 3. The member for attachment to a keyed shaft according to claim 1, wherein the drive device for the support frame is a cylinder operated by fluid pressure, and the drive device for the press-fitting tool is a cylinder operated by fluid pressure fixed to the support frame. Insertion assembly machine. 4 A gear that rotates around an axis parallel to the model shaft in which the rotational drive device for the model shaft meshes with a spur gear or helical gear fixed directly or indirectly to the upper part of the model shaft via a rotating shaft directly connected to the model shaft. An assembly machine for fitting a mounting member onto a keyed shaft according to any one of claims 1 to 3, wherein rotational force is guided from a drive source to the keyed shaft.