JPH0442015Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a mold moving cart for loading and unloading molds into and out of a press machine.

2. Description of the Related Art As shown in FIG. 6, a mold moving trolley is known in which a trolley body a is provided with a pair of driving wheels b and a driven wheel c, and is run along a rail d.
e is a mold.

In addition, as shown in Japanese Patent Application Laid-Open No. 58-74223, four wheels for longitudinal movement and four wheels for left and right movement are provided on the main body of the bogie, the two wheels for longitudinal movement are connected to a travel motor, and the two wheels for left and right movement are used for running. Mold moving carts connected to a motor are known.

Problems that the invention aims to solve: The former mold moving cart has a pair of drive wheels b, so if there is a foreign object on the running surface, it will be unable to run, and if there is a failure in the drive system, such as a broken drive shaft, it will be unable to run. becomes.

The latter mold moving trolley is similar to a mold moving trolley equipped with two driving wheels and two driven wheels if only the forward and backward movement is considered, and it suffers from the same problems as the former mold moving trolley mentioned above. Moreover, since the driving force is obtained from one traveling motor, the output of the traveling motor increases, making it large and the main body of the truck becomes taller, so the overall height when the bolster and mold are placed becomes higher. Since there are restrictions on the size of the press machine, etc., the height of the bolster and the mold become lower and the rigidity decreases accordingly.

Therefore, an object of the present invention is to provide a mold moving carriage for a press machine that can solve the above-mentioned problems.

Means and action for solving the problem Cylinder tubes 23 are provided on the front left and right sides of the bogie body 1.
are fixed respectively, and the pistons 24 are inserted into the respective cylinder tubes 23 to open the upper chamber 2.
5 and a lower chamber 26 respectively, and when fluid is supplied to the upper chamber 25, the piston 24 moves upward, and when fluid is supplied to the lower chamber 26, the piston 24 moves downward. A front housing 4 is provided on the piston 24 of each of the front lifters 5, and when the front wheel 2 is supported by the shaft 3 on each of the front housings 4 and the piston 24 is moved downward, the front wheel 2 is moved downwardly. It protrudes from the lower surface of the truck body 1, and when the piston 24 is moved upward, the front wheel 2 is placed above the lower surface of the truck body 1, and the left and right shafts 3 are connected, and one of the shafts 3 are connected to the output shaft of the front motor 9, cylinder tubes 23 are fixed to the rear left and right sides of the bogie body 1, and pistons 24 are inserted into each of the cylinder tubes 23 to form an upper chamber 25 and a lower chamber 26. are formed respectively to form the upper chamber 2.
When fluid is supplied to the lower chamber 26, the piston 24 moves upward, and when fluid is supplied to the lower chamber 26, the piston 24 moves downward.
4 are respectively provided with rear housings 13, and when the rear wheels 11 are respectively supported by shafts 12 in the respective rear housings 13 and the pistons 24 are moved downward, the rear wheels 11 protrude from the lower surface of the bogie main body 1, When the piston 24 is moved upward, the rear wheel 11 is placed above the lower surface of the truck body 1, and the left and right shafts 12 are connected, and one shaft 12 is connected to the output shaft of the rear motor 18. A first limit switch 21 that connects the front wheels 2 and rear wheels 11 to detect that the front wheels 2 and 11 protrude from the lower surface of the truck body 1; A mold moving cart for a press machine equipped with a second limit switch 22 for detecting.

As a result, the pair of left and right front wheels 2, 2 and the pair of left and right rear wheels 11, 11 are driven, respectively.
It can run reliably even if there is a foreign object on the running surface, it can run even if one of the drive systems breaks down, and since the driving force is obtained from the front motor 9 and the rear motor 18, the front motor 9, The output of the rear motor 18 is only 1/2 of the required driving force, and by making the front motor 9 and the rear motor 18 smaller, the height of the trolley body 1 can be lowered, and the overall height when loaded with the bolster and the mold can be reduced. In other words, since the workpiece conveyance height can be lowered, the height of the bolster and the mold can be increased accordingly to improve rigidity.

Embodiment A front housing 4 in which a front wheel 2 is supported by a shaft 3 is provided on the front left and right sides of a bogie body 1 so as to be movable up and down by a front lifter 5. Each shaft 3 is connected by a universal joint 6, and one The shaft 3 is a drive pinion 1 fixed to the output shaft of the front motor 9 via gears 7 and 8.
Connected to 0.

A rear housing 13 supporting a rear wheel 11 with a shaft 12 is provided on the rear left and right sides of the truck body 1 so as to be movable up and down with a rear lifter 14. Each shaft 12 is connected with a universal joint 15, and the other shaft 12 is gear 1
6. It is connected via a gear 17 to a drive pinion 19 fixed to the output shaft of a rear motor 18.

Then, the front and rear wheels 2 and 11 can run freely along the rail 20, and when the front and rear housings 4 and 13 are moved downward by the front and rear lifters 5 and 14, the front and rear wheels 2 and 11 protrude from the lower surface of the bogie body 1 and move to the rails. The lower surface of the bogie main body 1 comes into contact with the rail surface and becomes able to run, and the first limit switch 21 is turned on.
Confirm that it is possible to run in the ON state, and then start running. When the front and rear housings 4, 13 are moved upward by the front and rear lifters 5, 14, the front wheel 2 and the rear wheel 1 are moved upward.
1 is above the bottom surface of the bogie body 1 and is away from the rail surface, and the bottom surface of the bogie body 1 comes into contact with the rail surface, and the second limit switch 22 is turned on. The mold is replaced after confirming that the bottom surface is in contact with the rail surface, so that the mold can be directly supported on the rail surface without the impact of loading the mold acting on the shaft. Since the traveling operation is performed after confirming that traveling is possible with the ON signal of the first limit switch 21, it is possible to prevent the lower surface of the bogie body 1 from accidentally traveling with the bottom surface touching the rail surface. 2 limit switch 22
Since the mold is replaced after confirming that the bottom surface of the bogie body 1 is in contact with the rail surface with the ON signal, there is a risk of damaging the shaft etc. by accidentally replacing the mold with the bottom surface of the bogie body 1 separated from the rail surface. can be prevented.

At this time, even if the gears become disengaged, there is no effect as the vehicle will not run.

The front and rear lifters 5, 14 are shown in FIGS. 3, 4,
As shown in FIG. 5, a piston 24 is inserted into a cylinder tube 23 fixed to the truck body 1 to form an upper chamber 25 and a lower chamber 26.
The front and rear housings 4, 13 are fixed to the front and rear housings 4, 13, and the first and second limit switches 21, 22 are
Switch the switching valve (not shown) with the ON signal to open the upper chamber 2.
5. The supply of pressure oil to the lower chamber 26 is stopped, and the first and second limit switches 21 and 22 are attached to the cylinder tube 23 via a bracket 27, and the front and rear housings 4, 13
It is turned on by the first and second dogs 28 and 29 fixed to the switch.

That is, the switching valve is switched from the neutral position to the first pressure oil supply position, pressure oil is supplied to the upper chamber 25, the front and rear housings 4, 13 are raised, the truck main body 1 is moved relatively downward, and the When the lower surface of the trolley body 1 touches the rail surface, the second limit switch 22 is turned on.
Then, with this ON signal, the switching valve is switched to the neutral position and the supply of pressure oil to the upper chamber 25 is stopped to prevent the pressure in the upper chamber 25 from becoming abnormally high due to the operator forgetting to switch the switching valve. Similarly, the switching valve is switched from the neutral position to the second pressure oil supply position, and the lower chamber 2
6, the front and rear housings 4, 13 are lowered, and the truck body 1 is moved relatively upward. When the truck body 1 rises to a predetermined position, the first limit switch 21 is turned on, and the ON signal turns on the first limit switch 21. The switching valve is switched to the neutral position to prevent the truck body 1 from moving upward more than necessary due to the operator forgetting to switch the switching valve.

Effect of the invention A pair of left and right front wheels 2, 2 and a pair of left and right rear wheels 11,
11 are driven individually, the vehicle can run reliably even if there is a foreign object on the running surface, and it can still run even if one of the drive systems fails.

Also, since the driving force is obtained from the front motor 9 and the rear motor 18, the front motor 9 and the rear motor 18
The output of the main body 1 can be reduced to 1/2 of the required driving force, and the front motor 9 and rear motor 18 can be made smaller.
Since the height of the bolt and the mold can be lowered, the total height when the bolster and the mold are loaded, that is, the height of the workpiece conveyance, can be lowered, so the height of the bolster and the mold can be increased by that much, and the rigidity can be improved.

In addition, since the front and rear lifters 5 and 14 are provided to move the four wheels, the front wheel 2 and the rear wheel 11, up and down with respect to the bogie body 1, the four wheels can be pulled into the bogie body 1 and the bottom surface of the bogie body 1 can be lifted. Durability can be improved because it can be in contact with the running surface and can be directly supported on the running surface without the impact of loading the mold acting on the shaft.

Furthermore, with the ON signal of the first limit switch 21, it can be confirmed that the front wheels 2 and rear wheels 11 have protruded from the bottom surface of the bogie body 1, that is, that the bogie body 1 is ready to travel. The lower surface of the second limit switch 22 can be prevented from running with the lower surface of the second limit switch 22 in contact with the running surface.
With the ON signal, you can confirm that the front wheels 2 and rear wheels 11 are above the bottom surface of the bogie body, that is, that the bottom surface of the bogie body 1 is in contact with the running surface. It is possible to prevent damage to the shaft or the like by replacing the mold with the lower surface of the truck body 1 separated from the running surface.

[Brief explanation of the drawing]

1 and 2 are a plan view and a front view showing an embodiment of the present invention; FIGS. 3, 4, and 5 are a sectional view, a front view, and a side view of a front and rear lifter; The figure is an explanatory diagram of a conventional example. 1 is the truck body, 2 is the front wheel, 3 is the shaft, 4 is the front housing, 5 is the front lifter, 9 is the front motor, 11
12 is a rear wheel, 12 is a shaft, 13 is a rear housing, 14 is a rear lifter, 18 is a rear motor, 21 is a first limit switch, 22 is a second limit switch, 2
3 is a cylinder tube, 24 is a piston, 25 is an upper chamber, and 26 is a lower chamber.

Claims (1)

[Utility model registration claim] Cylinder tubes 23 are installed on the left and right sides of the front of the cart body 1.
The pistons 24 are inserted into the cylinder tubes 23 to fill the upper chambers 2
A front lifter 5 is provided with a piston 24 of each of the front lifters 5, and a front housing 4 is provided on each of the front housings 4 with axles 3, and when the piston 24 is moved downward, the front wheels 2 protrude from the bottom surface of the bogie body 1, and when the piston 24 is moved upward, the front wheels 2 are elevated above the bottom surface of the bogie body 1. The left and right axles 3 are connected, and one of the axles 3 is connected to the output shaft of a front motor 9. Cylinder tubes 23 are fixed to the left and right rear of the bogie body 1, and pistons 24 are inserted into the cylinder tubes 23 to form an upper chamber 25 and a lower chamber 26, respectively, and the upper chamber 2 is supported by the pistons 24.
When fluid is supplied to the lower chamber 26, the piston 24 moves downward.
4, rear housings 13 are provided on both sides of the carriage body 1, rear wheels 11 are supported by axles 12 on each of the rear housings 13, and when the pistons 24 are moved downward, the rear wheels 11 protrude from the underside of the carriage body 1, and when the pistons 24 are moved upward, the rear wheels 11 are above the underside of the carriage body 1, the left and right axles 12 are connected to each other, and one of the axles 12 is connected to the output shaft of a rear motor 18, and a first limit switch 21 is provided for detecting that the front wheels 2 and rear wheels 11 protrude from the underside of the carriage body 1, and a second limit switch 22 is provided for detecting that the front wheels 2 and rear wheels 11 are above the underside of the carriage body 1.