JPH0511927Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is a plate holding device for a shearing machine, which has a mounting part in which a flow path consisting of a groove extending horizontally on the upper surface is formed at the lower edge of the main body. This invention has a welded beam, and a plurality of hydraulic devices that supply and discharge pressure oil through the flow path are attached to the attachment portion of the beam.

(Prior Art) Conventionally, in this type of plate holding device, in order to configure the beam 12, as shown in FIG. The formed mounting portion 15 is welded and connected at welding portions 16 and 17, and the hydraulic device 62 has a cylinder 63 attached to the mounting portion 15, and a flow path 18 and a flow path 26 leading thereto. A device is used that supplies and discharges pressure oil through. 65 indicates a piston that can be moved up and down. 6
6 is Patsuking. In such a plate holding device, dust in the air, welding powder, etc. adhere to and remain on the contact portion 21 which overlaps the weld portions 16 and 17 during welding. Although the structure is such that it is difficult for these dust and other foreign substances to enter, they will remain even if the flow path 18 is cleaned later. Such fine dust is called contamination, and when cutting a material with a shearing machine, it gradually flows out due to shock, vibration, or bending upward near the center of the beam 12 due to the load, and it is caused by the cylinder. 63
The oil may flow into the interior of the packing 66 and eventually damage the packing 66, resulting in oil leakage.

(Problem that the invention aims to solve) This invention prevents contaminants such as dust and welding powder from entering the packing of a hydraulic system, prevents damage to the packing, and prevents oil leakage. To provide a plate holding device for a shearing machine that can increase resistance to twisting between cylinders.

(Means for solving the problem) This invention has a beam in which a mounting part with a channel formed by a groove extending laterally on the upper surface is welded to the lower edge of the main body, and A plate holding device for a shearing machine, in which a plurality of hydraulic devices for supplying and discharging pressure oil through the flow passages are attached to the section, each hydraulic device having a hollow piston fixed to the mounting section. a cylinder that fits on the outside of the piston so as to be able to rise and fall; a cylinder that closes the lower end and moves downward to hold the plate; To provide a plate holding device for a shearing machine, characterized in that it includes a helical spring that engages and returns a descended cylinder, and an annular packing that is attached to a certain upper part between the piston and the cylinder. It is something.

(Function) In this device, the packing is installed to some extent at the upper part between the piston and the cylinder, and even if the pressure oil contains contaminants, it stays in a low position and does not rise to the packing position, causing damage to the packing. and oil leakage. Furthermore, the length of contact between the piston and the cylinder becomes longer, which increases the resistance to twisting.

(Example) An example of this invention will be described below with reference to the drawings.

In one embodiment of the invention shown in FIGS. 1 and 2, reference numeral 10 denotes a frame, which includes side portions 11 on both sides and a beam 12 fixed between the side portions and extending vertically.
This beam has a substantially plate-shaped main body 1
A mounting portion 15 is welded to the lower end edge of 3 by welding portions 16 and 17. Reference numeral 18 denotes a flow path consisting of a groove extending horizontally on the upper surface of the mounting portion 15, one end of which is closed by a closing member 19, and the other end is connected to a hose (not shown) for supplying pressure oil. It is designed to be able to be discharged. Reference numeral 21 denotes a contact portion where the main body portion 13 and the mounting portion 15 overlap, and is a portion where contaminants such as dust in the air and welding powder may adhere.

Reference numeral 22 denotes hydraulic mountings installed at predetermined intervals on the lower surface of the attachment portion 15 of the beam 12, and the large diameter portion 25 at the upper end of each piston 23, which has a hollow interior, is fixed to the attachment portion 15 by bolts not shown. , and a flow path 26 is formed in the mounting portion 15 in order to communicate the hollow portion of the piston 23 with the flow path 18. 2
7 is fitted on the outside of this piston 23 to form the large diameter portion 2.
This is a cushion ring that is in contact with the lower surface of 5. 2
A cylinder 8 is fitted to the outside of the piston 23 so as to be movable up and down, and a cushion rubber 30 is attached to the lower end surface, and an annular packing 31 is provided at the upper part of the inner surface. This packing can also be provided on the piston 23 without providing it on the cylinder 28. 32 is a bolt that almost penetrates inside the piston 23 and becomes a rod-shaped member screwed into the cylinder 28; 33 is wound around the head of this bolt so that its upper end engages with the piston 2; and its lower end is attached to the piston 2.
This is a helical spring adapted to engage with the engaging portion 35 of No. 3. Reference numeral 36 denotes a pressurizing space formed at the inner bottom of the cylinder 28 so that a sufficient force based on pressure oil acts even when the cylinder 28 reaches its upper end. This space may not be formed. When pressure oil is supplied through the flow paths 18 and 26, the cylinder 28 descends to perform a plate-holding operation, and when the pressure of the pressure oil is removed, it is automatically raised by a spring 33 to discharge the oil. 38 is a lower blade fixed to the tip of the table 40. 41 is an upper blade fixed to the elevating member 42, and when lowered, the lower blade 38
The material to be cut 50 is cut in cooperation with the cutter.

(Effect of the invention) As described above, in this invention, the cylinder 28 of the hydraulic device 22 is raised and lowered to perform plate holding, so even if contaminants flow in from the channels 18 and 26, the bottom of the cylinder 28 Since there is no possibility of oil flowing into the packing 31 and rising to the packing 31, damage to the packing 31 and oil leakage can be prevented. Further, as shown in FIGS. 1 and 3, when the height L of the hydraulic device 22 of this invention and the conventional hydraulic device 62 are equal, the pistons 23 and 6
5 and the height of the contact area between cylinders 28 and 63
Since l1 and l2 are larger in this design, the resistance to twisting is extremely large. Therefore, even if the hydraulic device 22 is brought close to the lower blade 38 and the upper blade 41, which are places where the effect of eccentric load is large, it can withstand sufficiently, and the length to the edge of the workpiece 50 to be cut is It can sufficiently withstand even if the length becomes short, and the amount of leftover material that becomes scrap can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a vertical side view showing the main parts of this invention, FIG. 2 is a front view of the whole, and FIG. 3 is a vertical side view of the main parts of a conventional plate holding device. 12 is a beam, 13 is a main body part, 15 is a mounting part,
16 is a welding part, 17 is a welding part, 18 is a flow path, 22
is a hydraulic system, 23 is a piston, and 28 is a cylinder.

Claims (1)

[Scope of utility model registration request] It has a beam in which a mounting part with a channel formed by a groove extending in the horizontal direction on its upper surface is welded to the lower edge of the main body, and pressure oil is supplied to the mounting part of the beam through the channel. A plate holding device for a shearing machine, which is equipped with a plurality of hydraulic devices for discharging, and each of the hydraulic devices is fitted to a hollow piston fixed to a mounting part and to the outside of the piston so as to be able to rise and fall. a cylinder that closes its lower end and descends to hold the plate; a helical spring that is wound around a rod member that extends upward from the cylinder through the piston and that engages the lower end of the cylinder with the piston to return the lowered cylinder; . A plate holding device for a shearing machine, comprising: an annular packing attached to a certain upper portion between the piston and the cylinder.