Bending Roll

Abstract

To provide a bending roll that can efficiently and safely perform exchanging work of an upper roll.SOLUTION: A bending roll is equipped with left and right upper frames (a falling frame 3 and an upright frame 4) that support both end portions of an upper roll 1 through bearings 9 and 10 and bearing supporting members 21 and 22 in a rotatable manner, and has a hydraulic cylinder 7 for lifting the upper roll 1. The bearing supporting members 21 and 22 are coupled to a hydraulic cylinder 7 by a hydraulic clamp 23. When exchanging the upper roll 1, the coupling of the bearing supporting members 21 and 22 and the hydraulic cylinder 7 by the hydraulic clamp 23 is released to attach / detach the bearing supporting members 21 and 22 to / from the upper frames 3 and 4 with the upper roll 1 and the bearings 9 and 10. Therefore, work for attaching / detaching bearings to / from conventional bearing supporting members on the upright frame side can be omitted, and work for handing and moving the upper roll 1 with a crane also can be efficiently and safely performed.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a bending roll that bends a metal sheet by moving it back and forth between an upper roll and a pair of lower rolls. [Background technology]

[0002] A bending roll is a device that holds a metal plate between an upper roll and a pair of parallel lower rolls, and bends the metal plate by rotating the lower rolls and moving the metal plate back and forth (see, for example, Patent Document 1).

[0003] Fig. 10 shows the schematic structure of a general bending roll. This bending roll is equipped with an upper roll 1, a pair of lower rolls 2 arranged parallel to the upper roll 1 on both the front and rear sides below the upper roll 1, an upper frame 3 on the left side that supports one end of the upper roll 1, an upper frame 4 on the right side that supports the other end of the upper roll 1, and a lower frame 5 that supports both ends of each lower roll 2 and to which the upper frames 3 and 4 are attached.

[0004] The upper frame 3 on the left side is pivotally attached at its lower end to the lower frame 5, and is a tipping frame that pivots (tip-overs) axially outward away from one end of the upper roll 1 when the formed metal sheet is removed. The tipping operation of this tipping frame 3 and its restoration from the tip-over state to its original upright state are performed by the rotation and extension of a hydraulic cylinder 6 for the tipping frame 3 that is pivotally connected to the lower frame 5. On the other hand, the upper frame 4 on the right side is an upright frame that is held in an un-tip-over state. In addition, a hydraulic cylinder 7 that raises and lowers the upper roll 1 is provided at the top of each upper frame (tipping frame 3 and upright frame 4).

[0005] The upper roll 1 has an extension 1a at its other end that extends axially outward from the upright frame 4, and when it rises to its upper limit position, the extension 1a comes into contact with an upper roll holding mechanism 8 provided above it. When the tipping frame 3 is turned over, this upper roll holding mechanism 8 holds the extension 1a of the upper roll 1 in a cantilevered state so that it cannot rise or rotate horizontally, thereby preventing accidents caused by the swinging of the upper roll 1.

[0006] 11, bearing support members 11, 12 are fitted onto the outer surfaces of self-aligning roller bearings (hereinafter also simply referred to as "bearings") 9, 10 assembled to both ends of the upper roll 1, and each of the bearing support members 11, 12 is screwed onto the outer periphery of the lower end of the piston rod 7a of the hydraulic cylinder 7 provided on the upper frames 3, 4 on both the left and right sides. As a result, both ends of the upper roll 1 are rotatably supported by the upper frames 3, 4 via the bearings 9, 10 and the bearing support members 11, 12, respectively, and the upper roll 1 is capable of moving up and down by the operation of the hydraulic cylinder 7.

[0007] Here, the bearing 9 on the tip-over frame 3 side (left side) has a cylindrical bearing case 9a with one end closed on its outer periphery, and this bearing case 9a is removably fitted into the inner periphery of bearing support member 11. In addition, a bearing pressing member 9b that presses the outer ring of the bearing against the inner periphery step surface of bearing case 9a has a flange portion formed on the end opposite the pressing side fixed to the open end face of bearing case 9a with multiple bearing fixing bolts 9c.

[0008] On the other hand, the bearing 10 on the upright frame 4 side (right side) does not have a bearing case, and the bearing outer ring is directly and detachably fitted into the inner periphery of the bearing support member 12. The bearing presser member 10a, which presses the bearing outer ring against the inner periphery step surface of the bearing support member 12, has a flange portion formed on the end opposite the pressing side, which is fixed to the end face of one end of the bearing support member 12 with multiple bearing fixing bolts 10b.

[0009] As a result, when the tipping frame 3 is turned over, the left-side bearing support member 11 is separated from the upper roll 1 along with the tipping frame 3, and the upper roll 1 is left in a cantilevered state with the left-side bearing 9 still attached and the other end supported by the upright frame 4, and in this state the metal plate after forming can be removed. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Japanese Patent Application Publication No. 2019-76952 Summary of the Invention [Problem to be solved by the invention]

[0011] Incidentally, in the bending rolls described above, it may be necessary to replace the upper roll 1 with one having a different shaft diameter in order to accommodate changes in the type of metal sheet to be processed.

[0012] To replace the upper roll 1 in such a case, first, from the state shown in FIG. 11, remove the potentiometer (not shown) attached to the bearing support member 11 on the tipping frame 3 side (left side) and the bearing fixing bolt 10b attaching the bearing presser member 10a on the upright frame 4 side (right side) to the bearing support member 12 (steps B1 and B2 in FIG. 12). Next, as shown in FIG. 13, the tipping frame 3 is turned over and the upper roll 1 is removed together with the bearings 9 and 10 (steps B3 and B4 in FIG. 12). Subsequently, as shown in FIG. 14, the tipping frame 3 is temporarily restored to its original position and the bearing support members 11 and 12 on both sides are removed (steps B5 and B6 in FIG. 12).

[0013] This is the removal procedure for each component, and from then on, the components with specifications corresponding to the type of metal plate after the change are installed in the reverse order. That is, first, the bearing support members 11 and 12 on both sides are installed, and then the tipping frame 3 is turned over and the upper roll 1 is installed together with the bearings 9 and 10 (steps B7, B8, and B9 in Figure 12). Next, the tipping frame 3 is restored and the right-side bearing fixing bolt 10b and potentiometer are installed (steps B10, B11, and B12 in Figure 12), completing the replacement work.

[0014] However, the replacement work of the upper roll 1 according to the above procedure has the following problems. Specifically, in the process of removing the upper roll 1 (step B4), first, the bearing 10, which is tightly fitted into the right-side bearing support member 12, must be extracted with a hydraulic jack, which is a heavy task. Furthermore, the upper roll 1, which is now cantilevered due to the tipping frame 3 tipping over, receives a reaction force when its extension 1a abuts against the upper roll holding mechanism 8. To eliminate this reaction force, the upper roll 1 must be lifted at an angle with a crane and extracted from the upright frame 4. This crane operation requires the skill of an experienced worker. Furthermore, these operations also require improvement in terms of safety. The same applies to the process of installing the upper roll 1 (step B9).

[0015] Furthermore, the attachment and detachment of the bearing support members 11, 12 (steps B6, B7) is performed by rotating the hydraulic cylinder 7 that is threadedly connected to the bearing support members 11, 12, so this task also places a heavy burden on the worker and requires the skills of a skilled worker.

[0016] Furthermore, repeated attachment and detachment of the potentiometer in steps B1 and B12 may cause the potentiometer to shift in position, which may reduce the reproducibility of the results of measurements using the potentiometer.

[0017] The upper roll 1 may be replaced with one of the same specifications for maintenance, etc. In that case, it is not necessary to detach the potentiometer and bearing support members 11 and 12, and therefore steps B1, B5 to B8, and B12 of the above-mentioned replacement procedure are omitted. However, the problems of workability and safety remain in the detachment work of the upper roll 1 in steps B4 and B9.

[0018] On the other hand, in recent years, taking into consideration the workability of replacing the upper roll, bending rolls (hereinafter referred to as "machines with upper roll replacement specifications") have also been developed that have a structure in which the upper roll can be attached and detached integrally with the bearing support member. In machines with upper roll replacement specifications, steps B2, B5 to B8, and B11 of the general upper roll replacement procedure described above are omitted, and the upper roll detachment process corresponding to steps B4 and B9 does not require the work of pulling out and fitting the right-side bearing into and into the bearing support member, and the upper roll can be detached without abutting against the upper roll holding mechanism, so that the work can be done more efficiently than with machines with general specifications.

[0019] However, even with the upper roll replacement specification machine described above, the problem of reduced reproducibility of measurement results due to repeated removal and installation of the potentiometer attached to the bearing support member remains. Furthermore, while steps B2 and B11 of the standard replacement procedure are eliminated, a step of removing and installing the connecting fitting that connects the hydraulic cylinder of the upper frame to the bearing support member is added instead. Furthermore, because the connecting fitting is a two-part flange type and its connecting bolts are located in a narrow space between the front and rear surfaces of the upper frame, the work of removing and installing the connecting fitting is less labor-intensive than when the bearing support member is connected to the hydraulic cylinder by screws, but it is not necessarily easy to do, and there are safety issues as well.

[0020] Therefore, an object of the present invention is to provide a bending roll that allows the upper roll to be replaced efficiently and safely. [Means for solving the problem]

[0021] To solve the above problems, The bending roll according to the present invention comprises an upper roll, a pair of lower rolls arranged parallel to the upper roll on both the front and rear sides below the upper roll, a pair of upper frames arranged on both the left and right sides of the upper roll, lower frames supporting both ends of each lower roll and to which each upper frame is attached, bearings rotatably assembled to both ends of the upper roll, bearing support members fitted onto the outside of each bearing, hydraulic cylinders attached to each upper frame for raising and lowering the upper roll, and hydraulic clamps attached to each hydraulic cylinder for connecting or disconnecting the hydraulic cylinder from the bearing support members, one of the upper frames is configured to be able to be tilted in the axial direction away from the upper roll with its lower end as a fulcrum, and by tilting or standing one of the upper frames upright and moving the upper roll axially relative to the other upper frame with the bearings and bearing support members being connected together, the upper roll can be detached from and attached to each upper frame in a state where they are integrated together. [Effects of the Invention]

[0022] As described above, the bending roll of the present invention has a hydraulic clamp attached to the hydraulic cylinder for raising and lowering the upper roll, which is provided on the upper frame, and which connects the hydraulic cylinder to the bearing support member of the upper roll.When replacing the upper roll, the connection between the bearing support member and the hydraulic cylinder by the hydraulic clamp is released, and the tipping frame is turned over, allowing the upper roll to be detached from and attached to the upper frame together with the bearing and bearing support parts.This makes it possible to improve workability and safety in the upper roll removal and installation processes. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is a longitudinal sectional front view of a main part of a bending roll according to an embodiment of the present invention; [Figure 2] Cross-sectional view of the bearing support member on the upright frame side of Figure 1, viewed from the right [Figure 3] A side view of the bearing support member on the tipping frame side of Figure 1, viewed from the left [Figure 4] FIG. 2 is a longitudinal front view showing the tipping frame of FIG. 1 in the middle of tipping; [Figure 5] Flowchart showing the upper roll replacement procedure in Figure 1 [Figure 6] A longitudinal front view showing the state in which the upper roll of Figure 1 has been removed (the lower roll is omitted) [Figure 7] FIG. 2 is a longitudinal front view of the main part showing the state after the upper roll has been replaced, corresponding to FIG. 1. [Figure 8] A cross-sectional view of the bearing support member on the upright frame side of Figure 7, viewed from the right. [Figure 9] A side view of the bearing support member on the tipping frame side of Figure 7, seen from the left [Figure 10] Front view showing the schematic structure of a general bending roll [Figure 11] FIG. 11 is a longitudinal sectional front view of the main part of the bending roll of FIG. [Figure 12] Flowchart showing the upper roll replacement procedure in Figure 11 [Figure 13] FIG. 12 is a longitudinal front view showing the state in which the upper roll of FIG. 11 has been removed. [Figure 14] FIG. 14 is a longitudinal front view showing the state in which the bearing support members on both sides have been removed, following FIG. 13. DETAILED DESCRIPTION OF THE INVENTION

[0024] An embodiment of the present invention will be described below with reference to Figures 1 to 10. The schematic structure of this bending roll is the same as that of a conventional bending roll shown in Figure 10, and includes an upper roll 1, a pair of lower rolls 2 arranged on both the front and rear sides below the upper roll, a left upper frame (tilting frame) 3 supporting one end of the upper roll 1, a right upper frame (upright frame) 4 supporting the other end of the upper roll 1, a lower frame 5 supporting both ends of each lower roll 2 and to which the upper frames 3, 4 are attached, a hydraulic cylinder 6 for tilting and restoring the tilting frame 3, and a hydraulic cylinder 7 provided on each upper frame 3, 4 for raising and lowering the upper roll 1. A metal sheet (not shown) is sandwiched between the upper roll 1 and each lower roll 2, and the lower rolls 2 are rotated to bend the metal sheet while moving it back and forth. To remove the formed metal sheet, the upper roll 1 is raised to its upper limit position, its extension 1a is brought into contact with an upper roll holding mechanism 8, and the tilting frame 3 is tilted to perform the operation.

[0025] 1, self-aligning roller bearings 9, 10 are mounted on both ends of the upper roll 1, and bearing support members 21, 22 fitted onto the bearings 9, 10 are connected to hydraulic cylinders 7 on both the left and right sides, so that both ends of the upper roll 1 are rotatably supported by the upper frames 3, 4 via the bearings 9, 10 and bearing support members 21, 22, respectively, and the upper roll 1 is allowed to rise and fall by operation of the hydraulic cylinders 7. The left-hand bearing 9 has a flange portion of a bearing hold-down member 9b fixed to the open end face of a bearing case 9a with a plurality of bearing fixing bolts 9c, and the right-hand bearing 10 has a flange portion of a bearing hold-down member 10a fixed to one end face of the bearing support member 22 with a plurality of bearing fixing bolts 10b. These points are also the same as those of the conventional device described above.

[0026] The difference between this bending roll and conventional ones is the below-described connection structure between the bearing support members 21, 22 and the hydraulic cylinder 7. That is, as shown in Figures 2 and 3, in this bending roll, each of the bearing support members 21, 22 is connected to the hydraulic cylinder 7 by a hydraulic clamp 23 attached to the hydraulic cylinder 7.

[0027] The hydraulic clamp 23 comprises a cylinder member 23a fixed to the lower end surface of the piston rod 7a of the hydraulic cylinder 7, a rod-shaped piston member 23b partially housed in the cylinder member 23a so that it can move up and down, and a rectangular flat-plate-shaped engaging fitting (engaging member) 23c screwed to the outer periphery of the lower end of the piston member 23b, with the piston member 23b and the engaging fitting 23c forming a T-shape in side view. A potentiometer (not shown) is attached to the cylinder member 23a.

[0028] Although not shown in the figures, the cylinder member 23a also opens upward, and its internal space communicates with a hydraulic chamber formed at the lower end of the piston rod 7a of the hydraulic cylinder 7. The large diameter portion of the piston member 23b is housed in the hydraulic chamber of the piston rod 7a so that it can move up and down, and the piston member 23b and the engaging fitting 23c move up and down by supplying and discharging pressure oil to and from the hydraulic chamber.

[0029] On the other hand, bearing support members 21, 22 are provided at their upper portions with engagement holes 21a, 22a that open outward in the axial direction and into which engagement fitting 23c of hydraulic clamp 23 fits, and engagement grooves 21b, 22b that communicate with engagement holes 21a, 22a, open upward and outward in the axial direction, and through which piston member 23b of hydraulic clamp 23 passes. The inner surfaces of engagement holes 21a, 22a form contact surfaces 21c, 22c that come into axial contact with engagement fitting 23c of hydraulic clamp 23.

[0030] In the above-described connecting structure, the piston member 23b of the hydraulic clamp 23 is passed through the engaging grooves 21b, 22b of the bearing support members 21, 22, and the engaging fitting 23c of the hydraulic clamp 23 is inserted into the engaging holes 21a, 22a of the bearing support members 21, 22 and abuts against the abutment surfaces 21c, 22c at the back thereof, and the hydraulic clamp 23 is then operated (tightened / released) to raise and lower the piston member 23b and the engaging fitting 23c, thereby connecting and disconnecting the bearing support members 21, 22 to and from the hydraulic cylinder 7.

[0031] 4, with the bearing support members 21, 22 and the hydraulic cylinder 7 disconnected by the hydraulic clamp 23, the engaging fitting 23c and piston member 23b of the left hydraulic clamp 23 come out of the engaging hole 21a and engaging groove 21b of the left bearing support member 21. Furthermore, by moving the upper roll 1 horizontally to the left after the tipping frame 3 has been turned over, the engaging fitting 23c and piston member 23b of the right hydraulic clamp 23 come out of the engaging hole 22a and engaging groove 22b of the right bearing support member 22 (see FIG. 6).

[0032] In order to enable the left-side hydraulic clamp 23 to be smoothly attached to and detached from the bearing support member 21 when the tipping frame 3 is tilted and restored, the lower surface of the cylinder member 23a of the hydraulic clamp 23 and the upper surface of the engaging fitting 23c, as well as the upper surface of the bearing support member 21 and the upper and lower surfaces of the engaging hole 21a, are each partially curved. On the other hand, since the right-side bearing support member 22 is attached to and detached from the hydraulic clamp 23 parallel to the axial direction, the surfaces of the bearing support member 22 and the hydraulic clamp 23 that face each other in the vertical direction are each flat.

[0033] Next, a procedure for replacing the upper roll 1 of this bending roll with one having a smaller shaft diameter will be described.

[0034] In this case, the replacement work for the upper roll 1 involves first temporarily tying a crane rope (not shown) around the upper roll 1 (step A1 in FIG. 5). Next, the hydraulic clamps 23 on both sides are released (the piston members 23b and the engaging fittings 23c are lowered by about 10 mm), thereby releasing the connection between the bearing support members 21, 22 and the hydraulic cylinder 7, and lowering the upper roll 1 from the state shown in FIG. 1 so that its extension 1a does not come into contact with the upper roll holding mechanism 8 (step A2 in FIG. 5). Next, the upper roll 1 is lifted by about 5 mm, and then the tipping frame 3 is turned over as shown in FIG. 6, and the upper roll 1 is removed by moving it horizontally together with the bearings 9, 10 and bearing support members 21, 22 (steps A3 and A4 in FIG. 5).

[0035] Up to this point, the removal procedure for each component is complete; from then on, each component is installed in the reverse order. That is, first, the upper roll 1, which has a smaller shaft diameter than before replacement, is moved horizontally while being suspended together with the left and right bearings 9, 10 and bearing support members 21, 22, and the right bearing support member 22 is engaged with the right hydraulic clamp 23, thereby installing the upper roll 1 (Step A5 in FIG. 5). Here, standard bearings 9, 10 are used that correspond to the shaft diameter of the newly installed upper roll 1, while the bearing support members 21, 22 have an inner diameter that corresponds to the outer diameter of the new bearings 9, 10 (see FIGS. 7 to 9). Then, the tipping frame 3 is restored, and the left hydraulic clamp 23 is engaged with the left bearing support member 21 (Step A6 in FIG. 5).

[0036] In the above-mentioned step of attaching the upper roll 1 (step A5) and step of restoring the tipping frame 3 (step A6), the upper roll 1 is automatically positioned in the axial direction by abutting the engaging fittings 23c of each hydraulic clamp 23 against the abutment surfaces 21c, 22c of the engaging holes 21a, 22a of the corresponding bearing support members 21, 22. Therefore, there is no need to perform a separate task of positioning the upper roll 1, and the work can be performed efficiently.

[0037] Then, by tightening each hydraulic clamp 23 (raising the piston member 23b and the engaging fitting 23c), each bearing support member 21, 22 is connected to the hydraulic cylinder 7 (step A7 in FIG. 5). After that, the crane rope is removed from the upper roll 1 to release the suspended state (step A8 in FIG. 5), completing the replacement work and resulting in the states shown in FIGS. 7 to 9.

[0038] Although the procedure for replacing the upper roll 1 from one with a large shaft diameter to one with a small shaft diameter has been described here, the replacement procedure is the same when replacing the upper roll 1 from one with a small shaft diameter to one with a large shaft diameter.

[0039] According to the above-described procedure for replacing the upper roll 1 (when replacing with one having a different shaft diameter), when removing the upper roll 1, there is no need to pull out the bearings from the right-side bearing support member as in the conventional method, and the upper roll 1 can be lifted by a crane together with the bearings 9, 10 and bearing support members 21, 22 in a state where its extension 1a does not abut against the upper roll holding mechanism 8, and then removed from the upright frame 4. This reduces the workload, does not require the skills of a skilled worker to operate the crane, and allows for work to be done more efficiently and safely than in the conventional method. Similarly, workability and safety can be improved when installing the upper roll 1.

[0040] Furthermore, since the conventional process of removing and attaching the bearing support member (and the subsequent processes of restoring and tilting the tilting frame) can be omitted, the overall work efficiency of the upper roll 1 replacement work can be significantly improved compared to conventional methods.

[0041] Furthermore, since the potentiometer is attached to the hydraulic clamp 23, the conventional process of attaching and detaching the potentiometer to the bearing support member can be omitted, which also improves work efficiency and eliminates the problem of reduced reproducibility of measurement results due to detachment of the potentiometer.

[0042] Furthermore, when replacing the upper roll 1 with one of the same type, there is no need to remove and attach the potentiometer and bearing support member as in the conventional method, but the workability and safety in the process of removing and attaching the upper roll 1 can be improved compared to the conventional method, just as in the case of replacing the upper roll 1 with one of a different shaft diameter.

[0043] Furthermore, even for conventional upper roll replacement machines, the potentiometer removal and installation process can be omitted, and the work of removing and installing the connecting fittings that connect the hydraulic cylinder and bearing support member can be replaced with the easier and safer work of opening and tightening the hydraulic clamp 23, thereby improving work efficiency and safety.

[0044] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above meaning, and is intended to include all modifications within the meaning and scope of the claims.

[0045] For example, the hydraulic clamp is not limited to that of the above-described embodiment, and other general structures may also be employed. [Explanation of symbols]

[0046] 1 Upper roll 1a Extension 2 Lower roll 3 Upper frame (tipping frame) 4 Upper frame (upright frame) 5 Lower frame 6 Hydraulic cylinders (for tipping and restoring the tipping frame) 7 Hydraulic cylinder (for raising and lowering the upper roll) 7a Piston rod 8 Upper roll holding mechanism 9, 10 Bearings (self-aligning roller bearings) 21, 22 Bearing support member 21a, 22a engaging hole 21b, 22b Engagement groove 21c, 22c contact surface 23 Hydraulic clamp 23a Cylinder member 23b Piston member 23c Engagement fitting (engagement member)

Claims

1. Upper roll and a pair of lower rolls arranged parallel to the upper roll on both the front and rear sides below the upper roll; A pair of upper frames arranged on both the left and right sides of the upper roll; a lower frame supporting both ends of each of the lower rolls and to which each of the upper frames is attached; bearings mounted on both ends of the upper roll; a bearing support member fitted onto each of the bearings; a hydraulic cylinder provided on each of the upper frames for raising and lowering the upper roll; a hydraulic clamp provided on each of the hydraulic cylinders for connecting or disconnecting the hydraulic cylinder and the bearing support member; Equipped with one of the pair of upper frames is configured to be able to tilt with its lower end portion as a fulcrum in a direction away from the upper roll in the axial direction, A bending roll in which, with the connection between the bearing support member and the hydraulic cylinder by the hydraulic clamp released, one of the upper frames is turned over or stood upright, and the upper roll is moved axially relative to the other upper frame, thereby allowing the upper roll to be detached from each upper frame while being integrated with each bearing and each bearing support member.

2. 2. The bending roll according to claim 1, wherein a potentiometer is attached to the hydraulic clamp.

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