JPS6132762Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a tube body gripping device for a stamping machine that is mainly used for tubes with a circular cross-sectional outer circumference (the same applies hereafter, including round bars). It is related to a device for securely holding the tube without any problems and making accurate markings at appropriate positions on the tube body.

The stamping machine to which the holding device of the present invention is applied is particularly suitable for stamping a plurality of numbers, symbols, etc. one character at a time. In such a stamping machine, a stamping block moves slightly in the longitudinal direction of the tube to select characters and stamp the tube. In order to engrave a plurality of numbers, etc. on a straight line, it is preferable to grasp the tube and prevent the tube from moving during the printing. However, until now, there has been no tool that can quickly and reliably hold all of the steel pipes and the like of various sizes.

Therefore, the present invention provides a gripping device that achieves the above object by using a receiving tube block having an irregularly shaped V-groove and a pressing block with a V-groove that presses both ends of the receiving tube block. Embodiments of the present invention will be described below based on the drawings.

As shown in FIGS. 1 to 3, this gripping device 9 has the following features:
It consists of a tube receiving block 6 attached to the lower part of the main body frame 1 of the stamping machine, and pressing blocks 8 that move up and down opposite both ends of the tube receiving block 6. The tube receiving block 6
As shown in FIG. 3, a V-groove is cut along the entire length of the upper surface, and both ends thereof are cut away leaving only the bottom of the V-groove to form a substantially chevron-shaped cross section. Therefore, a large V-groove portion 3 is provided in the center of the tube receiving block 6,
Small V-grooves 4 are provided at both ends, and the valleys 5 of both grooves 3 and 4 are aligned. Further, each of the grooves 3 and 4 is formed with a tube end guide surface 10 that is slightly opened at one end edge on the entrance side of the steel tube 11. Then, the tube receiving block 6 is fixed to the main body frame 1 at a position opposite to the stamping block 2 of the stamping machine. Next, as shown in FIGS. 1 and 2, the pressing block 8 is fitted onto the upper edges of the two small V-grooves 4 formed at both ends of the tube receiving block 6, and the large V-groove 3 It has two V-groove portions 7 that are approximately equal to .
A connecting member 12 is provided to integrally connect the two V-grooves 7. The connecting member 12 has its middle portion cut out as shown in FIG. 1, and its inner surface is formed so that the tube receiving block 6 is fitted therein as shown in FIG. At the same time, a piston rod 13 is connected to the lower part of the connecting member 12, and the piston rod 13 can be driven up and down by a cylinder (not shown). In conjunction with the lifting/lowering drive, the V-groove 7 on the pressing side and the smaller V-groove 4 opposing it can be brought closer to each other or separated from each other. Incidentally, cowhide 19 is pasted on the inner surface of the V-groove portion 7 of the pressing block 8 in order to prevent noise and damage to the pipe. Next, this stamping machine is equipped with a stamping machine main body consisting of a stamping cylinder 14 that is driven in the vertical direction and a stamping block 2 provided at the tip of its piston rod.

Next, the operation of the tubular body gripping device of the present invention will be explained.

First, by a steel pipe conveying device (not shown), the steel pipe 11 conveyed from the right side in FIG. 1 is inserted into a pair of upper and lower V grooves 7 and 4 that have been separated from each other in advance. Then, the cylinder (not shown) of the pressing block 8 is driven and its piston rod 13 moves downward, and the steel pipe 11 is gripped by the pair of upper and lower V grooves 7 and 4. In this example, a steel pipe with a diameter of 20 mm is used.
It is capable of gripping up to 100mm steel pipes. This is because the smaller V-groove 4 of the tube receiving block 6 forms a pair with the larger V-groove 7 of the pressing block 8, allowing the V-grooves 4 and 7 to be brought very close together. That is, in the case of a small diameter steel pipe 11a,
The distance between the pair of upper and lower V grooves 7 and 4 is small, and the steel pipe 11
a is mainly held by both the V-grooves 7 and 4.
On the other hand, in the case of a large-diameter steel pipe 11b, the intervals between the blocks 6 and 8 are relatively large, and the steel pipe 1
1b mainly refers to the large V in the center of the tube receiving block 6.
It is gripped by the groove 3 and the large V-groove 7 of the pressing block 8. In this case, since the gripping positions of the V-grooves 3 and 7 differ in the longitudinal direction of the steel pipe 11b, a bending moment is applied to the steel pipe 11b based on the gripping. However, in this case, since the steel pipe 11b has a large diameter and a large section modulus, the steel pipe 11b will not be deformed or damaged by the bending moment. In the case of a small-diameter steel pipe 11a, as described above, the steel pipe 11a is in contact with the small V-groove 4 of the tube support block 6, and the upper and lower gripping positions are the same, so the bending moment due to gripping is Does not occur. Therefore, even if the small-diameter steel pipe 11a is gripped with a relatively strong pressing force, there is no risk of deforming or damaging the steel pipe 11a. Next, the stamping machine is driven to determine the stamping position, and the stamping block 2 is driven to select characters. Then, the marking cylinder 14 is lowered, and the numbers, etc. on the marking block 2 are pressed onto the steel pipe 11 and stamped thereon. At this time, both ends of the stamped portion of the steel pipe 11 are gripped by the gripping device, and the lower surface of the stamped portion of the steel pipe 11 is held in the large V-groove portion 3 of the tube support block 6.
It is supported by fitting. Therefore, there is no risk that the steel pipe 11 will be deformed or damaged due to the marking.

As is clear from the above embodiments, the configuration of the tube gripping device of the present invention has a large V-groove portion 3 and two small V-groove portions 4, 4 provided at both ends of the large V-groove portion 3. A tube receiving block 6 is provided in which the valley bottoms 5 of the pipes 4 and 4 are made to coincide with each other. Then, the tube receiving block 6 is fixed to the main body frame 1 of the stamping machine at a position opposite to the stamping block 2. Furthermore, large V grooves facing only the two small V grooves 4, 4, respectively, are provided.
It is equipped with a pressing block 8 in which a groove 7 is formed, and the pressing block 8 can be driven in the direction in which the opposing V-grooves 4 and 7 approach and move away from each other.

Since the tubular body gripping device of the present invention has the above-described configuration, it can reliably grip tubular bodies of various sizes from large diameters to small diameters without deforming or damaging them. In addition to gripping both ends of the stamping part, it also supports the lower surface of the tube in the stamping part, prevents the tube from moving or deforming during stamping, and has the effect of quickly and reliably making a good-looking stamp. There is.

[Brief explanation of the drawing]

Fig. 1 is an elevational view of a stamping machine having the tube gripping device of the present invention, Fig. 2 is a view taken along the line A-A in Fig. 1, and Fig. 3 is a perspective view of the tube holder block of the main tube gripping device. . 1... Body frame, 2... Engraved block,
3, 4, 7... V groove, 5... Valley bottom, 6... Tube receiving block, 8... Pressing block, 9... Gripping device, 10... Tube end guide surface, 11, 11a, 11b
... Steel pipe, 12 ... Connection member, 13 ... Piston rod, 14 ... Cylinder for stamping, 19 ... Cowhide, 20 ... Guide rod.

Claims (1)

[Scope of utility model registration request] The stamping block 2 is placed on the main body frame 1 of the stamping machine.
A tube support block 6 is fixed facing to the tube support block 6, which is formed by a large V-groove 3 and two small V-grooves 4, 4 provided at both ends thereof, with their valley bottoms 5 aligned with each other; A stamping machine comprising a pressing block 8 in which large V-grooves 7 on the pressing side facing only the small V-grooves 4, 4 are formed, and both the V-grooves 4, 7 are driven in the directions toward and away from each other. tube gripping device.