JPH0525574B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for vertically positioning a vertically movable elevating shelf while supporting a mold to be attached to and removed from a press.

When replacing the mold in a press, it is common to use, for example, a puerlift or a crane, since the mold is extremely heavy. However, in the past, it took time to change the mold, so in recent years, a mold changing device has been adopted.

This type of mold exchange device has a first mold support part that supports a new mold to be replaced with respect to the press, and a second mold support part that supports the mold removed from the press, vertically. It is common to have an elevating shelf that can be moved up and down. Various configurations can be adopted to move the elevating shelf up and down, such as using a link mechanism or a chain that moves up and down. However, the weight of the mold is several 100 kg to several
It is heavy at 1000 kg, and in order to accurately position each mold support at the height of the press bolster, for example, the vertical movement speed of the elevating shelf is slow, making it easier to change molds quickly. There was a problem.

This invention has been made in view of the above-mentioned conventional problems, and embodiments thereof will be described in detail below with reference to the drawings.

First, in order to facilitate understanding, the overall configuration of the mold changing device will be described.

As is clear from the plan view of FIG. 1, the mold changing device 1 according to the embodiment of the present invention is installed on the right side of the press 3 (lower side in FIG. 1) in the front-back direction of the press 3 (left and right in FIG. 1). It is supported by a rail 5 extending in the direction) so as to be movable back and forth.

Riding on this rail 5, the electric motor 7, reducer 9, sprocket 11, chain 13, and sprocket 1 are installed.
A truck 23 is provided which is movable back and forth by means of a drive wheel 19 attached to an axle 17 driven by a wheel 5 and a rear idler wheel 21 (see FIG. 3).

As will be described later, the cart 23 forms a support frame that vertically supports an elevating shelf that supports molds to be attached to and removed from the press 3, and has a frame structure.

As is clear from FIGS. 1 and 3, a wide sleeper 25 is provided at a part of the rear of one of the rails 5, and a bogie 23 is provided at the top of the slope section 27 provided on this sleeper 25. A hole (not shown) into which a vertically movable locking rod 29 is engaged is provided in a part of the hole.

Therefore, the lever 3 provided above the locking rod 29
1 can be operated to keep the trolley 23 locked so that it does not move back and forth.

Furthermore, on both sides of the rail 5 in the vicinity of the drive wheel 19 and the idler wheel 21 that ride on the rail 5 equipped with the above-mentioned wide sleepers 25, in order to prevent the cart 23 from shifting in the left-right direction (vertical direction in FIG. 1). A clamping roller 33 that clamps the rail 5 from the left and right sides is provided to hang down from the truck 23.

An operation box 35 is provided at the rear end of the trolley 23, and an electric motor 37 with a brake for raising and lowering an elevating shelf (to be described later) and a reduction gear 39 are provided on the back side of the operation box 35. Two sprockets 43 are attached.

A chain 44 or the like is connected to the two sprockets 43 described above, and two sprockets are provided in the front-rear direction of the truck 23 at the height of the drive wheels 19 and idler wheels 21 (horizontal direction in FIGS. 1 and 3). sprocket shaft 45
Rotation is transmitted through two twin sprockets 47.

The shelf frame 49 is shown in the center of the square frame of the cart 23 on the left side of FIG.
5 has been extended.

The shelf frame 49 forms a vertically movable vertically movable shelf that indicates the molds to be attached and detached from the press 3, and is vertically movable within the cart (support frame) 23 configured in a frame structure. It is supported by.

As is clear from FIGS. 2 and 3, an upper sprocket shaft 51 is provided on the upper part of the truck 23 in correspondence with the sprocket shaft 45 described above. That is, a total of four sprocket shafts are provided in the upper, lower, left, and right directions, and eight sprockets 53 attached to both ends of each sprocket shaft are connected by four chains 52 that extend upward and downward.

Eight sprockets 53 as shown in FIG.
Slightly above the four lower sprockets 53 inside, there are connecting plates 55 provided at the four corners of the shelf frame 49 described above.
is connected to the inside of the chain 52.

Therefore, the shelf frame 49 is moved up and down within the cart 23 by being driven by the above-mentioned electric motor 37 with a brake.

The part shown on the right side of FIG. 2 is the general mold loading/unloading device 57, and the upper mold 59 shown in FIG.
This is a device for transporting the press 3 and the lower die 61 to the position of the bolster 63 of the press 3, or for transporting the press 3 from the position of the bolster 63 to the position of the shelf frame 49.

As is clear from FIG.
The chain 70 drives the upper sprocket shaft 71.

Further, electric wires and fluid pressure piping are guided to the loading/unloading device 57 by a cable bear 73, and a flexible conduit leads power and fluid pressure to a mold gripping/moving device 75 that forms a part of the loading/unloading device 57. 77, a flexible operating rod 79 such as a chain for moving the gripping and moving device 75, and a circulation chain 80 for guiding the flexible operating lever 79. Sprocket shaft 71
It is provided in

Idle sprockets 87 and 89 corresponding to the sprockets 83 and 85 described above are loosely fitted onto the lower sprocket shaft 91.

The line indicated by the two-dot chain line in the upper part of FIG. It occupies a position.

FIG. 4 is a partially enlarged view of the same plan view as FIG. A total of eight sprockets 53 are provided.

The chain 52 is wound around the above-mentioned upper and lower sprockets 53, and the shelf frame 49 connected to the chain 52 by a connecting plate 55 moves up and down.

The shelf frame 49 is provided with a multi-stage wheel train 101 (four stages in this embodiment) that supports the opposing edges of the upper mold 59 and the lower mold 61. The upper mold 59 is stored in the 101 facing downward, the lower mold 61 is stored in the second stage upward, and the above is repeated in the third and fourth stages.

Vertical guide bars 103, 103 are provided at the center of the front and rear surfaces (left and right sides in FIG. 4) of the shelf frame 49, and the trolley 23 has three
A guide roller set 105 from one side is provided in contact with the other.

A groove rail 107 that straddles the shelf frame 49 from side to side (in the vertical direction in FIGS. 1 and 4) is installed at a slightly lower position of the lower die 61 in the approximate center of the shelf frame 49 in the front-rear direction.
A groove rail 10 is provided in parallel with the groove rail 107 and is also an extension of the groove rail 107 in the upper framework part of the truck 23.
9 (see Figure 1).

In this way, the shelf frame 4 is moved by the electric motor 37 with a brake.
9 is raised and lowered, and when the three groove rails 109, 107, 109 reach the same level by the detection device 111, the raising and lowering movement of the shelf frame 49 is stopped.

A four-wheel vehicle (not shown) moves left and right (in the vertical direction in FIGS. 1 and 4) on the groove rail 109 shown in FIG. The T-shaped member 115 of the gripping and moving device 75 provided on the flat plate 113 connects or disconnects the flat plate 113, the upper die 59, and the lower die 61.

The T-shaped member 115 is rotatably provided so as to be in a horizontal state and a vertical state, and when the T-shaped member 115 is in the vertical state, the upper end of the T-shaped member 115 engages with the engaging portion of the upper die 59. and the lower end portion thereof is configured to engage with the engaging portion of the lower die 61. When the T-shaped member 115 is rotated horizontally, the upper and lower ends of the T-shaped member 115 are disengaged from the engaging portions of the upper and lower molds 59 and 61.

First, in the empty part of the shelf frame 49 shown in FIG.
The upper mold 59 and the lower mold 61, which are connected to the flat plate 113 by the T-shaped member 115 of the above-mentioned gripping and moving device 75 on the wheel shafts 101 provided in multiple stages, are moved from the processing center of the press 3 or the mold stocker. It is pulled out and stored in the shelf frame 49.

In this case, a stopper 117 that sets the position of the leading end of the mold is installed at the front and back ends of each stage (see Fig. 1).
A limit switch 119 is provided at the stopper 117 at the rearward end.

Next, as shown in Figure 7, at the front and back ends of the rear end of the mold (lower left and right ends in Figures 1 and 4),
A set of stopper devices 121 is provided for each two stages, such as the first stage, the second stage, the third stage, and the fourth stage.

The stopper device 121 includes a shaft rod 125 that is vertically slidable along a bracket 123 fixed to the shelf frame 49, and has an upper stopper that extends horizontally through notches 127 provided at the upper and lower ends of the bracket 123. A plate 129 and a lower stopper plate 131 are fixed to the upper and lower ends of the shaft rod 125.

The shaft rod 125 is urged upward by a bullet 133, and the lower stopper plate 131 is normally in contact with the ceiling of the notch 127.

As shown in FIG. 6, the upper stopper plate 129 is, for example, a single piece and extends to a position where it comes into contact with the front edge of the upper die 59, while the lower stopper plate 131 has an L-shaped planar shape. A single leg protrudes toward the front carriage 23, and the long leg extends to a position where it abuts the edge of the front end of the lower die, similar to the upper stopper plate 129.

As shown in FIG. 7, when moving the mold to or from the multi-stage wheel train 101 of the shelf frame 49, the upper surface of the lower mold 61 is the pass line of the workpiece. It is located at the same height as 93.

At this time, a rotary actuator 135 driven by fluid pressure, for example, is provided on the upper framework of the truck 23, which corresponds to the height position of the L-shaped short legs of the lower stopper plate 131, and its output shaft 137 has a rotary actuator 135 that is rotatable. An arm 139 is provided.

Since the rotating arm 139 presses down on the lower stopper plate 131, the shaft rod 125 is lowered against the bullet 133, and the upper stopper plate 129 and the lower stopper plate 131 are at a height that does not restrict the front end of the mold. move to the position.

Next, as shown in FIG. 1, FIG. 2, FIG. 4, FIG. 5, and FIG. One embodiment of a one-way latch 141 is provided above the left and right sides of the figure (bottom surface side in FIG. 2).

This one-way clutch 141 allows the shelf frame 49 to rise relative to the cart 23, but functions to support the shelf frame 49 by restricting and locking the shelf frame 49 from descending under its own weight. It is structured as follows.

As is clear from FIG. 5, the one-way latch 141 has a fluid pressure cylinder 143 with a short stroke length provided above the carriage 23, and its piston rod 145 rotates around a horizontal axis 147 provided above. is connected to a swingable L-shaped check protrusion 149.

Of course, the above-mentioned fluid pressure cylinder 143 has a built-in bullet (not shown), and its biasing force keeps the upper end of the L-shaped lower end of the check projection 149 horizontal.

The check protrusion 149 serves as a support member that locks onto and supports a portion of the shelf frame 49, and is provided so as to be movable forward and backward relative to the ascending and descending path along which the shelf frame 49 ascends and descends.

On the other hand, a protrusion 151 is provided on the shelf frame 49 at a position corresponding to the non-return protrusion 149.
A sloped portion 153 as shown in the figure is provided at the portion where the shelf frame 49 comes into contact with the protrusion 151 on the outside of the shelf frame.

Further, as shown in FIG. 9, a pin 155 is provided below the check projection 149, and a limit switch device 156 as a detection device is provided at both ends of its swing range.

Next, as is clear from Figure 8, the trolley 2
3. A one-way clutch 141' as a second embodiment is illustrated above the left frame.

The one-way clutch 141' described above is the fourth one-way clutch 141'.
As shown in the figure, the groove rail 109 (see Figure 1)
a table-shaped fluid pressure cylinder 143' provided below;
A link 159 driven by this, a swing shaft 161,
Furthermore, it consists of a non-return protrusion 167 as a support member that swings around a shaft 165 provided above the frame of the truck 23 via a second link 163.

In other words, the check protrusion 167 is activated by a bullet built in the central fluid pressure cylinder 143' (not shown).
continues to maintain the state shown in FIG.

On the other hand, the shelf frame 49 is provided with an L-shaped protrusion 169 at a position corresponding to the non-return protrusion 167 described above, and when the L-shaped protrusion 169 comes into contact with the non-return protrusion 167, the shelf frame 49 is prevented from moving downward. It will be blocked.

FIG. 10 shows a state in which the hydraulic cylinder 143' is at its lowest height due to the built-in bomb, and limit switches 171, 171 as sensors are shown on the right side of the figure.

The embodiment device described in detail above is a relatively simple device, and when the shelf frame 49 is raised, the non-return protrusions 149 and 167
This means that the shelf frame can be raised by being pushed by the protrusion 151 and the L-shaped protrusion 169 against the elastic material contained in the hydraulic cylinders 143 and 143'.

However, the protrusion 151 and the L-shaped protrusion 169 rise above the check protrusions 149 and 167, and this check protrusion 1
The limit switch 15 is activated by the oscillation of 49,167.
6,171 is activated, the above-mentioned ascent is stopped in response to the signal, and then the robot descends while its speed is regulated by the brake of the electric motor 37 with a brake due to its own weight. Thus, in this embodiment, there are four non-return protrusions 1.
The protrusions 151 and 169 come into contact with the upper surfaces of 49 and 167, and the shelf frame 49 is supported.
This completes the vertical positioning of the

Needless to say, the height at which the upward positioning is completed as described above maintains a height relationship that ensures that the mold supported on the wheel train of the shelf frame is located at the same level as the upper surface of the press bolster. be.

Needless to explain, in order to lower the mold below the pass line after the mold has been transferred from or to the shelf frame, the shelf frame must be raised once in both the first and second embodiments. Then, the fluid pressure cylinder is operated to separate the check projection from the movement path of the projection or the L-shaped projection.

The purpose is then achieved by driving the electric motor with a brake to lower the shelf frame.

In this way, the method and apparatus of the present invention can always keep the lifting stop position of the shelf frame constant, making it possible to perform high-speed vertical positioning. In addition, even if the elongation of the four chains differs due to a single load on the mold, the level of the mold can be reliably and easily adjusted, and mold replacement can be done safely and efficiently. be.

It is also clear that design changes can be easily made without departing from the technical idea of the present invention.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an embodiment of the device of the present invention, Fig. 2 is a left side view of the same as above, Fig. 3 is an elevational view of Fig. 1, and Fig. 4
The figure is an enlarged plan view of the shelf frame part in Fig. 1, Fig. 5 is a cross-sectional view taken along the - arrow in Fig. 4, Fig. 6 is an enlarged detailed view of the stopper device in Fig. 4, and Fig. 7 is the Fig. 6 of-
Cross-sectional view in the direction of arrows, Figure 8 is a partially enlarged view of Figure 2, Figure 9
The figure is a - cross-sectional arrow view of Fig. 8, and Fig. 10 is a cross-sectional view of Fig. 8.
It is a left side partial enlarged view of the figure. (Explanation of symbols representing main parts of the drawing), 3...
Press, 23...Dolly, 37...Electric motor with brake, 49...Shelf frame, 141...One-way latch, 149...Check protrusion, 169...L-shaped protrusion.

Claims (1)

[Claims] 1. Molds 59, 6 to be attached to and removed from the press and replaced.
1, a plurality of support members are provided on a support frame 23 that vertically supports the elevating shelf 49 so as to be able to move forward and backward with respect to the elevating path of the elevating shelf 49. 14
9 is pushed away and the elevating shelf 49 is once raised above this support member 149, each of the supporting members 149 is returned to the elevating path, and the elevating shelf 49 is lowered to the position of the supporting member 149. A method for positioning an elevating shelf of a mold changing device for a press, characterized in that the vertical position of the elevating shelf 49 is determined by supporting the elevating shelf 49. 2 Dies 59, 6 to be attached to and removed from the press and replaced
A plurality of support members 149 provided on a support frame 23 that supports the elevating shelf 49 in a vertically movable manner allows the elevating shelf 49 to rise. is provided so as to be movable forward and backward with respect to the elevating path of the elevating shelf 49 so as to lock onto a portion of the elevating shelf 49 to prevent the elevating shelf 49 from descending when the elevating shelf 49 is lowered, and each support member 149 is connected to the elevating shelf 49. 49. A lifting/lowering shelf positioning device for a mold changing device for a press, characterized in that it is provided with a drive device 143 for retracting from the lifting path of 49.