JP2004314261A - Shearing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shearing machine which extensively shortens time required to change a shearing blade by facilitating changing work of the shearing blade, compacts a shear housing, improves shearing precision, eliminates controlling of fastening torque of a bolt for fixture, and is easy to maintain. <P>SOLUTION: A groove 6 for installation of the shearing blade is provided on a rotating drum 4, the shearing blade 5 is arranged free to connect and disconnect in the groove 6 by projecting its knife edge 5a outward, the shearing blade 5 is clamped in the groove 6 by pressing a wedge 12 furnished with a pressurizing surface 12a made contact with one surface of the shearing blade 5 and inclined in a direction to cross with an axis (x) of the shearing blade 5 toward the inside of the groove 6 on the shearing blade 5 through a disc spring 14 to energize to the inside of the groove 6, and a fluid pressure cylinder 13 for unclamping to release pressing force against the shearing blade 5 of the wedge 12 against energizing force of the disc spring 14 is provided in the rotating drum 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention mainly cuts a strip (strip) in the width direction, cuts a crop, and cuts a sample sheet to obtain a strip steel (strip) rolling equipment and a processing line, for example. More particularly, the present invention relates to a device for fixing a shearing blade (knife / knife) in a groove on the outer peripheral surface of a rotary drum in a drum type shearing machine (drum type shear), for example.
[0002]
[Prior art]
In the above-mentioned drum type shearing machine, in order to fix the shearing blade to the rotating drum, the shearing blade was arranged with a cutting edge protruding in a groove provided on the outer peripheral surface of the rotating drum, and a wedge (wedge) was brought into contact with the shearing blade. It is generally performed by tightening the wedge with a bolt that penetrates or does not penetrate the rotating drum in a state (for example, see Patent Documents 1 and 2).
[0003]
In addition, the fixing structure of the shearing blade is the same as the above, but the wedge can bite into the shearing blade and is not easily dislodged even if the fixing bolt is loosened, so the contact part between the wedge and the shearing blade can be mechanically pushed open. Thus, a shearing machine in which a cylinder is incorporated in a rotating drum and a wedge is moved by a piston rod has been proposed (for example, see Patent Document 3).
[0004]
[Patent Document 1]
Japanese Utility Model Application Laid-Open No. 63-186518 (Description of Examples and FIG. 1)
[Patent Document 2]
Japanese Patent No. 3369668 (Paragraph No. 0020/0021, FIGS. 2 and 4)
[Patent Document 3]
JP-A-2000-237916 (paragraph numbers 0011 to 0013 and FIGS. 1 to 3)
[0005]
[Problems to be solved by the invention]
However, the fixing structure using the above-described conventional fixing bolt has disadvantages in the following points. That is,
1. The work of screwing the nut to the screw part of the fixing bolt and tightening it is necessary, and it takes a long time to fix, and the tightening torque force must be periodically measured after the tightening and managed so that there is no looseness.
[0006]
2. When tightening the fixing bolt, it is necessary to provide a detent so that the bolt does not run idle.
[0007]
3. The replacement of the shear blade requires a great deal of man-hour, and the replacement requires a long time of about 12 hours for three workers.
[0008]
4. The nut tightening part of the fixing bolt may not be loosened due to rust.In such a case, it is necessary to loosen by heating to a high temperature, and sometimes it is necessary to cut the gas. They are so bad that they need to be replaced for each fixing bolt.
[0009]
5. In particular, when it is difficult to work on-line for the reason described in 4 above, it is necessary to prepare a spare rotating drum and replace the shearing blade off-line. Accordingly, a crane or the like is required to move the rotary drum out of the line. In addition, since the shear body must be taken in and out of the line, the entire shear becomes large and the gap between the shear housing and the shear fixing device in the line becomes large, which may adversely affect the shearing accuracy.
[0010]
The present invention has been made in view of the above points, and makes it easy to replace a shearing blade, greatly shortening the time required for the replacement, and also improving the shearing accuracy by reducing the size of the shear housing, and further fixing. It is an object of the present invention to provide a shearing machine that does not require the management of the tightening torque of a bolt for maintenance and facilitates maintenance.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, a shearing machine according to the present invention is provided with a shearing blade mounting groove in a shearing machine main body, and a shearing blade is detachably disposed in the groove with its cutting edge protruding outward. A wedge provided with a pressing surface (wedge surface) that is inclined inward of the groove with respect to an upper surface or a lower surface (one surface orthogonal to a pressing direction (shear direction) of the shear blade) of the shear blade; The shear blade is clamped in the groove by pressing against the shear blade through a spring that abuts on the upper surface or the lower surface of the groove and biases inward of the groove, and resists the urging force of the spring. An unclamping fluid pressure cylinder for releasing the pressing force of the wedge against the front shearing blade is provided in the shearing machine main body.
[0012]
According to the shearing machine of the present invention having the above configuration, the wedge is brought into contact with the shearing blade arranged with the cutting edge protruding outward in the groove provided in the shearing machine main body including the rotary drum. The shearing blade is pressed against the inclined surface of the wedge by being urged inwardly (inside) of the groove by a spring such as a disc spring, and is fixed under the urging force inward of the groove. You. As a result, unlike the related art, there is no tightening portion such as a nut that is screwed to the screw portion such as a bolt, so that it is not necessary to manage the loosening of the screw portion, and maintenance becomes easy. That is, it is not necessary to constantly monitor the tightening force of the screw portion and the like and tighten the screw when the screw is loosened. Further, since it is not necessary to tighten the nut portion to be screwed to the screw portion of the bolt, a conventional bolt rotation preventing member or a conventional rotation preventing structure is not required.
[0013]
On the other hand, when replacing the shearing blade, the wedge is pushed out with a pressurized fluid by a fluid pressure cylinder against the above-mentioned spring force, and the pressing force of the wedge against the shearing blade and the urging force by the spring are eliminated. Is pulled away from the shear blade. For this reason, even when the inclined surface of the wedge is galling on one surface (upper surface or lower surface) of the shear blade, the contact surface between the wedge and the shear blade is spread out. Can be easily extracted from
[0014]
From the above, the number of steps required for replacing the shearing blade is reduced, the operation is simplified, and the replacement time is greatly reduced. Therefore, even if the shearing blade is replaced on-line, the operation is further facilitated, and the working time can be reduced.
[0015]
The shearing machine according to claim 2, wherein the shearing machine is a drum-type shearing machine including a pair of rotating drums each equipped with a cooperating shearing blade with a member to be sheared (such as a strip) interposed therebetween, and the groove. Is provided on the outer peripheral surface of each rotary drum as a shearing machine main body.
[0016]
The shearing machine according to claim 2 is a drum type shearing machine, wherein the shear blades mounted on the pair of rotary drums face each other across the member to be sheared, and the pair of corresponding shear blades approach each other as the rotary drum rotates. And cooperate to cut the sheared member. The shear blades are attached to the grooves on the outer peripheral surface of each rotating drum.There are one shear blade and two shear blades on each rotating drum. Mounted in position.
[0017]
A shearing machine according to a third aspect is characterized in that the shearing machine main body is provided with a shearing blade pushing fluid pressure cylinder having a piston rod for pushing out the shearing blade from the groove.
[0018]
Since this type of shear blade has a long blade length and a large weight, it is not easy to take out the shear blade from the groove even if the pressing force by the fixing wedge is canceled in the state where it is arranged in the groove, According to the shearing machine of claim 3, the piston rod can be extended by the cylinder and pushed out of the groove by using the fluid pressure, so that the shearing blade can be easily lifted by, for example, a crane. Can be taken out. Since the removal of the shearing blade is facilitated in this way, the installation of a new shearing blade is performed smoothly, and eventually, the replacement of the shearing blade is facilitated, and the replacement time is further reduced.
[0019]
5. The shearing machine according to claim 4, wherein a rotary joint is attached to a center of rotation of each of the rotary drums, and the unclamping fluid pressure cylinder and the shear are passed through the rotary joint and through a fluid path provided in the rotary drum. 6. A pressurized fluid is supplied to the blade pushing hydraulic cylinder.
[0020]
According to the shearing machine of the fourth aspect, the pressurized fluid is supplied to the fluid pressure cylinder in the rotary drum via the rotary joint when the shearing blade is replaced, or the pressure fluid in the fluid pressure cylinder is externally supplied. And it is not necessary to remove the coupler from the fluid path.
[0021]
The shearing machine according to claim 5, wherein the hydraulic cylinder for unclamping is a hydraulic cylinder, one end of a piston rod of the hydraulic cylinder projects from one end of the cylinder body, and the projecting end is integrated with the wedge. And a conical spring is provided between the piston and the end of the cylinder body around the piston rod in the cylinder body.
[0022]
According to the shearing machine of the fifth aspect, the use of a coned disc spring as the spring exerts a compact and strong urging force, and the shearing blade can be securely fixed by the wedge, and when the cylinder is of the backward movement type, The disc spring is immersed in the oil inside the cylinder body to prevent rusting, and because the disc spring is compressed around the piston rod rod, it is compact and relatively small space in the shearing machine body Can be built in.
[0023]
The shearing machine according to claim 6 is characterized in that the inclination angle of the pressing surface of the wedge contacting the upper surface or the lower surface of the shear blade is about 7 °.
[0024]
As shown in FIG. 6A, P: spring force, θ: wedge inclination angle = 7 °, β: friction angle = tan ⁻¹ μ ₂ , μ ₁ : coefficient of friction (0.15), μ ₂ : friction The coefficient is (0.15), and β = tan ⁻¹ (0.15) = 8.53 °. Therefore, according to the shearing machine of the sixth aspect, Q: the pressing force of the shearing blade is P = Qtan (θ + β) + Qμ ₁ = Q (tan (θ + β) + μ ₁ ) Q = P / (tan (θ + β) + μ ₁ ) Ｑ Q = P / (tan (7 + 8.53) +0.15) = 2.34P
[0025]
As a result, the pressing force of the shear blade 2.34 times the spring force is exerted by the wedge (inclination angle 7 °).
[0026]
Further, as shown in FIG. 6 (b), _when the clamping force by the spring of the shearing force = _{F T} shearing blade acting shear blades (the biasing force) to _{P H, P H = F T} · tan (θ-β _{) -F T μ 1 = F T} (tan (θ-β) -μ 1)
To clamp loosen the _{P H> 0 ∴tan (θ-} β)> μ 1
When β = tan ⁻¹ (0.15) = 8.53 ° and μ ₁ = 0.15, θ> 17.1 °. Therefore, shearing machine according to claim 6, wherein the wedge angle of inclination: θ = 7 ° or because its is around, at the time of clamping of the shearing blade according to the wedge has a "SelfLock" state, any shearing force (F _T) Even when the wedge acts, the wedge is fixed to the shear blade, and no force for loosening the clamp is generated.
[0027]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of a shearing machine according to the present invention will be described below with reference to the drawings.
FIG. 1 is a side view schematically showing an entire drum-type shear according to a first embodiment of a shearing machine. FIG. 2A is a sectional view showing a shearing blade clamp structure which is a feature of the present invention. Is a longitudinal sectional view showing a wedge mechanism of the shearing blade in a clamped state, FIG. 2B is a sectional view taken along a line AA in FIG. 2A, and FIG. 2C shows a wedge mechanism of the shearing blade in an unclamped state. FIG. 2D is a longitudinal sectional view, FIG. 2D is a longitudinal sectional view showing a wedge mechanism of the shearing blade in a released state, and FIG. It is CC sectional drawing of (e).
[0028]
As shown in FIG. 1, the drum type shear 1 includes a shear housing 2 having a pair of an operating side and a driving side, and two upper and lower openings of each shear housing 2 around a central axis 4a of the rotating drums 4 described below. A part 3 is provided. In the upper part 3a and the lower part 3b in the opening 3, drum-shaped rotary drums 4 are supported rotatably about a rotary shaft 4a, respectively, as viewed from the side.
[0029]
On the outer peripheral surface side of each of the upper and lower rotary drums 4, a shear blade 5 is provided at a target position around the rotary shaft 4a. Each of the shearing blades 5 extends linearly in parallel with the rotating shaft 4a, and is mounted in an elongated groove 6 formed in the outer peripheral portion of the rotating drum 4 in parallel with the rotating shaft 4a, that is, along the normal line. The shearing blade 5 has a cutting edge 5a at a tip, and a holder 7 having an L-shaped cross section is attached to two surfaces, a lower surface and a back surface of the blade main body 5b. The horizontally long groove 6 includes a lower portion 6a for storing the shearing blade 5, an upper entrance side 6b where a wedge 12 described later is located, and an upper inner side 6c for storing a main body side of a wedge mechanism 11 described later. 6c is formed from a plurality (eight in the present embodiment) of circular holes deep inward in the radial direction at intervals in the normal direction. A lower liner 8a and an upper liner 8b are fitted into the lower and upper surfaces of the entrance sides 6a and 6b of the horizontally long groove 6, respectively.
[0030]
A plurality of (eight) lower inclined surfaces 12a of the wedges 12 are in contact with the upper surface of the shearing blades 5 extending in the normal direction at intervals. As shown in FIG. 2, a substantially T-shaped locking groove 12b is formed in the wedge 12 when viewed from above, and the distal end 16d of the piston rod 16 is locked in the locking groove 12b. 16d is integrally connected to the wedge 12. A piston portion 16a of the piston rod 16 is slidably mounted in the main body 13a of the single-acting hydraulic cylinder 13 for unclamping.
[0031]
In the present embodiment, as shown in FIG. 2A, a straight line x extending from the center axis 4a of the rotary drum 4 to the upper surface of the shear blade 5 and extending in the radial direction of the rotary drum 4 (in other words, in the shear direction of the shear blade 5). The intersection angle θ between the direction orthogonal to the circumferential direction of a certain rotary drum 4, that is, the radial direction of the rotary drum 4) and a straight line y extending along an extension of the central axis of the piston rod 16 is 7 °. Around the rod portion 16c of the piston rod 16, between the end surface 13b of the cylinder body 13a and the piston portion 16a, a plurality of disc springs 14 are compressed and stacked in a superposed state. Of the pair of shear blades 5 mounted on each rotary drum 4, one cuts the leading end side of the strip (not shown) and the other cuts the rear end side of the strip (not shown). The shape is different as in FIG. The wedge 12, the hydraulic cylinder 13 having the piston rod 16, and the disc spring 14 constitute the wedge mechanism 11.
[0032]
3 (a) is a longitudinal sectional view showing a pushing mechanism of the shear blade in a state before pushing (unclamping state), FIG. 3 (b) is a sectional view taken along line AA of FIG. 3 (a), and FIG. FIG. 3D is a vertical sectional view showing a pushing mechanism of the shearing blade in a state after pushing, FIG. 3D is a sectional view taken along line BB of FIG. 3C, and FIG. 4 shows an arrangement of an unclamping hydraulic cylinder and a pushing hydraulic cylinder. FIG. As shown in FIG. 4, the pushing mechanism 17 of the shearing blade 5 is provided on both sides of the shearing blade 5, and has a pair of single-acting hydraulic cylinders 18 for pushing as shown in FIG. Storage portions 6d each formed of a circular hole are formed inward in the radial direction near both sides of the lower portion of the horizontally long groove 6, and a hydraulic cylinder 18 is stored in each circular hole 6d. A tip portion 19a of the piston rod 19 of the hydraulic cylinder 18 projects radially outward from the end face, and the tip portion 19a is in contact with the back surface of the holder 7 of the shearing blade 5. The pushing force of the shear blade 5 by these two hydraulic cylinders 18 is weak, and the pushing of the shear blade 5 becomes possible only when the clamping state of the shear blade 5 by the wedge 12 is released.
[0033]
FIG. 5 is a schematic diagram showing a part of the pressure oil supply mechanism of one rotary drum. As shown in FIG. 5, a rotary joint 21 protrudes from one side of a central shaft 4 a of each rotary drum 4, and one end of each of three hydraulic pipes 22, 23, 24 is provided at a tip joint 21 a of the rotary joint 21. Is connected. Inside the rotary drum 4, a supply / discharge oil passage 25 connected to the unclamping single-acting hydraulic cylinder 13 of one of the shear blades 5 (right side in FIG. 1), and the other (left side in FIG. 1) A supply / discharge oil passage 27 connected to the single-acting hydraulic cylinder 13 for unclamping and a supply / discharge oil passage 26 connected to both of the single-acting hydraulic cylinders 18 for pushing the shearing blade are respectively drilled. Is connected to the hydraulic pipe 22, the oil supply / discharge passage 26 is connected to the hydraulic pipe 23, and the supply / discharge oil path 27 is connected to the hydraulic pipe 24. The other ends of the hydraulic pipes 22 to 24 are selectively connected to a common hydraulic source (not shown) or a common oil tank (not shown) via a switching valve (not shown).
[0034]
The shearing machine of this embodiment is configured as described above, and the operation of the shearing machine will be described below.
[0035]
In FIG. 1, a strip (not shown) is conveyed between the upper and lower rotating drums 4, and simultaneously, the upper and lower rotating drums 4 synchronize, and the upper and lower rotating drums 4 and 4 move in a specific direction. , The corresponding shear blades 5 of the upper and lower rotating drums 4 approach and cooperate to cut a strip (not shown) in the width direction. At this time, the peripheral speed of the cutting edge 5a of each of the shearing blades 5, 5 mounted on each of the rotary drums 4 is operated with a slightly positive or negative relative speed to the strip conveying speed. In such a working state, the pair of unclamping hydraulic cylinders 13 and the pushing hydraulic cylinders 18 of each rotary drum 4 are connected to the oil tank, and no hydraulic pressure acts on the piston rods 16 and 19. The shear blade 5 is firmly fixed (clamped) by the wedge 12 under the urging force of the disc spring 14. In this state, it does not come off even if any shearing force acts on the shearing blade 5 as described above.
[0036]
On the other hand, when the shear blade 5 is replaced, a switching valve (not shown) is switched to supply hydraulic oil from a hydraulic source (not shown) to the hydraulic cylinders 13 and 18 so that the piston of each hydraulic cylinder 13 The rod 16 pushes each wedge 12 out of the elongated groove 6 against the urging force of the disc spring 14. As a result, the shearing blade 5 receiving the pressing force from the eight wedges 12 is released from the restrained state, and is simultaneously pushed out of the horizontally long groove 6 by receiving the pushing force of the piston rods 19 of the hydraulic cylinders 18 on both sides. . The pushed-out shear blade 5 is removed by being lifted by a crane or the like, or by being supported by an actuator of a dedicated shear blade exchange device or the like.
[0037]
Thereafter, the pressurized oil in the hydraulic cylinder 18 for extrusion is released, and a new shearing blade 5 is inserted into the elongated groove 6 by a crane or the like, and the piston rod 19 is pushed into the original storage position. Then, by letting out the pressurized oil of the hydraulic cylinders 13 for unclamping, the eight wedges 11 are pulled back into the elongated grooves 6 under the urging force of the disc springs 14, and the shearing blades 5 are clamped.
[0038]
Therefore, when the shearing blade 5 is replaced, the nut screwed into the screw portion of the fixing bolt for fixing the wedge 12 as in the related art is loosened to remove the through bolt. After the replacement, manual work such as fixing the wedge 12 with bolts, screwing a nut to the screw portion, and tightening is unnecessary. Further, since the pressing force of the wedge 12 against the shearing blade 5 is mechanically released by a cylinder, there is no work to beat the wedge 12 or to loosen or cut the fixing bolt by heating the gas with gas. The shear blade 5 is not damaged. Further, since it is not necessary to take out the drum type shear 1 from the line when replacing the shear blade 5, there is no need for a spare shear and no place for installing the taken out shear, and the entire drum type shear 1 including the shear housing 2 is included. The structure can be simplified and lightened. In addition, since the pressing force of the wedge 12 is secured by the spring force of the disc spring 14 or the like, there is no need to periodically measure the tightening force of the fixing bolt and re-tighten, so that maintenance is not required. Easy.
[0039]
The embodiment of the shearing machine of the present invention has been described above, but the embodiment can be carried out as follows.
[0040]
1. The spring for pressing the wedge 12 is not limited to the disc spring 14, but may be a coil spring or the like.
[0041]
2. Although it is necessary to increase the number of oil supply / discharge passages in the rotary drum 4 as compared with the single-acting type, a backward-acting hydraulic cylinder or air cylinder can be used.
[0042]
3. By providing the holder 7 with a hook or the like on the holder 7 and pulling out the same with a crane, the pushing mechanism of the shearing blade 5 including the hydraulic cylinder 18 for pushing can be omitted. Only two oil passages are required. In addition, the hydraulic cylinder 18 for pushing can be made to be a backward movement type, and the piston rod 19 can be retracted by hydraulic pressure. In this case, it is necessary to drill at least four oil supply / drain passages in the rotary drum 4. There is.
[0043]
4. Although a drum type shearing machine provided with a pair of upper and lower shearing blades 5 has been described, not only a shearing machine having one rotating blade but also a non-drum type, for example, a crank type or swing type shearing machine. Applicable.
[0044]
【The invention's effect】
As is clear from the above description, the shearing machine of the present invention has the following excellent effects.
[0045]
a) Since the number of steps for replacing the shearing blade is reduced and the operation becomes easier than before, the time required for replacement can be greatly reduced.
[0046]
b) In the case of a drum type shear, it is not necessary to take out the entire shear from the line, so that the entire shear can be made compact and the gap between the shear housing and the shear fixing device in the line can be reduced. Can be improved.
[0047]
c) Since a spring force and a wedge mechanism can secure a necessary and sufficient pressing force to clamp the shearing blade, it is not necessary to manage the tightening torque of the fixing bolt as in the related art, and maintenance becomes easy.
[0048]
d) If the inclination angle of the wedge mechanism is set to about 7 °, the shearing blade is kept in a self-locking state when it is clamped, and does not loosen even if any shearing force acts on the shearing blade.
[0049]
e) There is no need for a spare rotary drum, and there is no need to handle heavy objects other than the shearing blades, thus improving safety and ease of maintenance.
[0050]
f) If the pressurized fluid is supplied to and discharged from the fluid pressure cylinder in the rotary drum via the rotary joint, the fluid pipe can be connected at all times, so that it is not necessary to attach and detach the coupler to the fluid path.
[Brief description of the drawings]
FIG. 1 is a side view schematically showing an entire drum type shear which is a first embodiment of a shearing machine according to the present invention, and a sectional view of a shear blade clamp structure which is a characteristic part of the present invention. .
2 (a) is a longitudinal sectional view showing a wedge mechanism of a shearing blade in a clamped state, FIG. 2 (b) is an AA sectional view of FIG. 2 (a), and FIG. FIG. 2D is a vertical sectional view showing the wedge mechanism of the shearing blade in the released state, FIG. 2D is a vertical sectional view showing the wedge mechanism of the shearing blade in the released state. FIG. 2F is a cross-sectional view taken along the line CC of FIG.
3A is a longitudinal sectional view showing a shearing blade pushing mechanism in a state before pushing (unclamping state), FIG. 3B is a sectional view taken along line AA in FIG. 3A, FIG. FIG. 3C is a longitudinal sectional view showing a pushing mechanism of the shearing blade in a state after the pushing, and FIG. 3D is a sectional view taken along the line BB of FIG. 3C.
FIG. 4 is an explanatory view showing an arrangement of an unclamping hydraulic cylinder and a pushing hydraulic cylinder in the DD direction of the shearing machine of FIG. 1;
FIG. 5 is a schematic diagram showing a part of a pressure oil supply mechanism of one rotary drum in the shearing machine of FIG. 1;
FIG. 6 (a) is an explanatory view showing a state where a shearing blade is pressed with a force of two to three times the spring force, and FIG. 6 (b) shows any shearing state in a state where the shearing blade is clamped by a wedge according to the present invention. It is explanatory drawing which shows that a shear blade does not loosen even if a force acts.
[Explanation of symbols]
1 Drum type shear (shearing machine body)
2 Shear housing 3 Opening 3a Upper part 3b of opening 3 Lower part of opening 3 Rotary drum 4a Rotating shaft 5 Shear blade 5a Blade tip 5b Blade main body side 6 Groove 6a Lower 6b of horizontal groove 6 Upper entrance side of horizontal groove 6 6c Hydraulic cylinder accommodating portion 7 for upper side 6d Horizontal groove 6 Extruding hydraulic cylinder housing 7 Horizontal groove 6 Holder 8a Lower liner 8b Upper liner 11 Wedge mechanism 12 Lower inclined surface 12b of wedge 12 Locking groove 13 of wedge 12 Unclamping hydraulic cylinder 13a Cylinder body 13b of unclamping hydraulic cylinder End face 14 of unclamping hydraulic cylinder Disc spring (spring)
16.19 Piston rod 16a Piston part 17 of piston rod 16 Extrusion mechanism 18 Hydraulic cylinder 21 for extrusion Rotary joint 21a Tip joint part 22-24 of rotary joint 21 Hydraulic pipe 25-27 Oil supply / drainage passage

Claims (6)

The shearing machine body is provided with a groove for mounting a shearing blade, and the shearing blade is detachably disposed in the groove so that its blade edge protrudes outward,
A wedge having a pressing surface inclined toward the upper surface or lower surface of the shear blade toward the inside of the groove, via a spring that abuts against the upper surface or lower surface of the shear blade and urges the groove inward. The unclamping fluid pressure cylinder, which presses the shearing blade against the shearing blade by pressing the shearing blade against the shearing blade by pressing the shearing blade into the groove and cancels the pressing force of the wedge against the shearing blade against the urging force of the spring, is used. A shearing machine provided in a machine body. The shearing machine is a drum-type shearing machine including a pair of rotary drums each equipped with a cooperating shear blade with a member to be sheared therebetween, and the groove is provided on an outer peripheral surface of each rotary drum as a shearing machine body. The shearing machine according to claim 1, wherein the shearing machine is used. The shearing machine according to claim 1 or 2, wherein the shearing machine main body is provided with a shearing blade pushing fluid pressure cylinder provided with a piston rod for pushing out the shearing blade from the groove. A rotary joint is attached to the center of rotation of each of the rotary drums, and pressurized fluid is supplied to the unclamping fluid pressure cylinder and the shear blade pushing fluid pressure cylinder through the rotary joint and through a fluid path provided in the rotary drum. The shearing machine according to claim 3, wherein the shearing machine is supplied. The hydraulic cylinder for unclamping is a hydraulic cylinder, one end of a piston rod of the hydraulic cylinder is protruded from one end of a cylinder body, and the protruding end is integrally connected to the wedge, and the piston in the cylinder body is The shearing machine according to any one of claims 1 to 4, wherein a disc spring is contracted between the piston and the end of the cylinder body around the rod. The shearing machine according to any one of claims 1 to 5, wherein the inclination angle of the pressing surface of the wedge contacting the upper surface or the lower surface of the shearing blade is set to about 7 °.

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